JP2007007758A - Table device and machine tool provided with the table device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a table device capable of continuously adjusting a distance between a lower surface of a table and an auxiliary support portion, and a machine tool provided with the table device.
A table device 30 of a machining center has a vibration suppression mechanism that can suppress vertical vibration generated in a rotary table 33. In this vibration suppression mechanism, the table support blocks 65 provided on the lower surfaces near the front end and the rear end of the rotary table 33 are brought into contact with the cam follower 63 fixed on the base 32 side, so Suppresses vibration. Further, the table support block 65 is supported so as to be movable toward the cam follower 63 side, and is urged toward the cam follower 63 side by a block position adjusting screw, whereby the table support block 65 continuously moves toward the cam follower 63 side. . Therefore, the distance between the cam follower 63 and the table support block 65 can be continuously adjusted.
[Selection] Figure 2

Description

  The present invention relates to a table device and a machine tool including the table device, and more particularly to a table device including a rotary table and a machine tool including the table device.

  2. Description of the Related Art Conventionally, a machining center that is an example of a machine tool is known that includes a table device having a rotary table that can hold a workpiece on a base serving as a base. This table device mainly includes a base, a spindle that is rotatably supported by the base using a sleeve, and a rotary table that is concentrically fixed to the top of the spindle and rotates integrally with the spindle. ing. And the work holding part is provided in the both ends of the upper surface of this rotary table so that a rotating shaft may become a symmetrical center, respectively.

  In the table device having such a configuration, it is possible to hold another workpiece in the other workpiece holding portion while processing the workpiece held in one workpiece holding portion with a tool. Further, when the processing on the work held by one work holding unit is completed, the rotary table is rotated 180 degrees, and the processing of the new work previously held by the other work holding unit is started. At the same time, the processed workpiece held by one workpiece holding unit is removed, and another new workpiece is held. By such a method of use, it is possible to continuously process a plurality of workpieces, and in effect, it is possible to omit the workpiece attachment / detachment time. That is, the working time required for the machining process in the machine tool can be shortened.

By the way, as described above, in such a table apparatus, while cutting a workpiece held on one of the two workpiece holding portions, the workpiece is held on the other workpiece holding portion. Detachment is performed. At this time, the rotary table vibrates up and down by the work of attaching and detaching the work, and the position of the work being processed sometimes fluctuates. Therefore, for example, when one rotary column (auxiliary support part) whose tip is close to the lower surface of the rotary table is provided below the rotary table (rotary table) and the rotary table vibrates more than a predetermined amount in the vertical direction A rotary index (table device) is known in which a support column is in contact with a contact plate on the lower surface of a rotary table to suppress vertical vibration of the rotary table (see, for example, Patent Document 1). Furthermore, in this rotary index, the distance between the contact plate and the support column is stepped by adjusting the distance between the contact plate and the lower surface of the rotary table by arranging shims in steps between the contact plate and the rotary table. Can be adjusted.
Japanese Patent No. 3632746

  However, according to the rotary index described in Patent Document 1, the adjustment of the distance between the contact plate and the lower surface of the rotary table is performed stepwise by placing a shim between the contact plate and the rotary table. It is not possible to adjust a minute distance below the thickness of the shim. As a result, the distance between the contact plate and the column (auxiliary support portion) may not be adjusted, and in some cases, there has been a problem that vertical vibration accompanying rotation of the rotary table cannot be sufficiently suppressed. Furthermore, since the shim cannot be adjusted when the support column is in contact with the contact plate on the lower surface of the rotary table, the rotary table has to be moved to separate the support column from the contact plate. .

  The present invention has been made to solve the above-described problems, and provides a table device capable of continuously adjusting the distance between the lower surface of the table and the auxiliary support portion, and a machine tool including the table device. Objective.

  In order to achieve the above object, in the table device according to claim 1, the table is supported horizontally by the support portion, and the tip portion abuts on the lower surface of the table to assist the table, and The auxiliary support part which suppresses the vibration which arises in the said table, and the continuous adjustment mechanism which can adjust continuously the space | interval of the said front-end | tip part of the said auxiliary support part and the lower surface of the said table are provided.

  Moreover, in the table apparatus according to claim 2, in addition to the configuration of the invention according to claim 1, the continuous adjustment mechanism is configured such that the contact member provided on the lower surface of the table and the contact member are continuously provided. It is comprised from the continuous movement means which moves and adjusts the space | interval of the said contact member and the front-end | tip part of the said auxiliary | assistant support part.

  According to a third aspect of the present invention, in addition to the configuration of the second aspect of the invention, a cam follower is provided at the tip of the auxiliary support portion, and the lower portion of the contact member is in contact with the upper portion of the cam follower. Touch.

  According to a fourth aspect of the present invention, in addition to the configuration of the third aspect of the invention, the continuous movement means includes a guide means for guiding the abutting member toward the cam follower, and the guide means. And a moving means for moving the contact member toward the cam follower.

  According to a fifth aspect of the present invention, in addition to the configuration of the fourth aspect of the invention, the continuous movement means includes a spring that pulls the contact member away from the cam follower along the guide means. ing.

  Further, in the table device according to claim 6, in addition to the configuration of the invention according to claim 4 or 5, the guide means is provided along the lower surface of the table, and the lower part of the contact member An abutting surface that abuts on the upper portion of the cam follower is provided, and the abutting surface is inclined obliquely upward toward the cam follower side.

  Further, in the table device according to claim 7, in addition to the configuration of the invention according to claim 1, the continuous adjustment mechanism includes a contact member provided at a distal end portion of the auxiliary support portion, and the contact member. It is comprised from the continuous movement means which moves continuously and adjusts the space | interval of the said contact member and the lower surface of the said table.

  According to an eighth aspect of the present invention, in addition to the configuration of the seventh aspect of the invention, a cam follower is provided on the lower surface of the table, and the upper portion of the contact member abuts on the lower portion of the cam follower.

  In addition to the configuration of the invention according to any one of claims 1 to 8, the table device according to claim 9 is provided with a rotating means for rotating the support portion, and the rotating means rotates the support portion. To rotate the table.

  In the table device according to claim 10, in addition to the configuration of the invention according to claim 9, a pair of the contact member and the continuous movement means are provided via a rotation axis of the table.

  A machine tool according to an eleventh aspect includes the table device according to any one of the first to tenth aspects.

  In the table device according to the first aspect, the distance between the tip end portion of the auxiliary support portion and the lower surface of the table can be continuously adjusted by the continuous adjustment mechanism in accordance with the deflection or inclination of the table. Thereby, since the front-end | tip part of an auxiliary | assistant support part supports a table from lower side, the vibration which arises in a table can be suppressed.

  Further, in the table device according to claim 2, in addition to the effect of the invention according to claim 1, in the continuous adjustment mechanism, the tip end portion of the auxiliary support portion comes into contact with the contact member provided on the lower surface of the table. Therefore, the vertical vibration of the table is suppressed, and the entire table can be held horizontally. Furthermore, since the contact member can be continuously moved toward the distal end portion of the auxiliary support portion by the continuous movement means, the distance between the contact member and the distal end portion of the auxiliary support portion can be finely adjusted. it can.

  In the table device according to claim 3, in addition to the effect of the invention according to claim 2, a cam follower is provided at the tip of the auxiliary support portion, and the lower portion of the contact member abuts on the upper portion of the cam follower. Slide. Thereby, it can prevent that the lower part of an abutting member hits directly the front-end | tip part of an auxiliary | assistant support part, and is damaged.

  In the table device according to claim 4, in addition to the effect of the invention according to claim 3, the contact member is guided to the cam follower side by the guide means and continuously moved by the moving means. Thereby, the space | interval of a contact member and a cam follower can be adjusted continuously and correctly.

  In the table device according to claim 5, in addition to the effect of the invention according to claim 4, the continuous movement means is provided with a spring that pulls back the abutting member in the direction away from the cam follower along the guide means. Thereby, since the contact member is always urged in the direction away from the cam follower, the contact member can be moved to the cam follower side by the distance moved by the moving means.

  In the table device according to claim 6, in addition to the effect of the invention according to claim 4 or 5, the contact member is moved to the cam follower side along the lower surface of the table. Since the contact surface of the contact member is inclined obliquely upward toward the cam follower side, when the contact member is moved toward the cam follower side, the distance between the contact surface and the cam follower is gradually reduced. Can do. Thereby, the distance between the contact member and the cam follower can be adjusted continuously and accurately.

  Further, in the table device according to claim 7, in addition to the effect of the invention according to claim 1, in the continuous adjustment mechanism, the contact member provided at the distal end portion of the auxiliary support portion contacts the lower surface of the table. Thus, vibrations generated in the vertical direction of the table can be suppressed. Furthermore, since the contact member can be continuously moved by the continuous moving means, the distance between the contact member and the lower surface of the table can be finely adjusted.

  Further, in the table device according to the eighth aspect, in addition to the effect of the invention according to the seventh aspect, the upper part of the abutting member comes into contact with and slides on the lower part of the cam follower provided on the lower surface of the table. It is possible to prevent the contact member from directly hitting the lower surface of the plate and damaging it.

  Further, in the table device according to claim 9, in addition to the effect of the invention according to any one of claims 1 to 8, the support portion is rotated by the rotating means to rotate the table, so that the work is placed on the table. Even in this case, the contact member on the lower surface of the table contacts the cam follower of the auxiliary support portion, so that it is possible to suppress the both ends of the table from vibrating in the vertical direction. Further, the distance between the contact member and the cam follower is adjusted by moving the contact member with the continuous moving means while the contact member on the lower surface of the table remains in contact with the cam follower of the auxiliary support portion. Can do. Thereby, in order to adjust the space | interval of a contact member and a cam follower, the trouble of rotating a table both ways and separating a contact member from a cam follower can be saved.

  Further, in the table device according to claim 10, in addition to the effect of the invention according to claim 9, since the contact member and the continuous movement means are provided in a pair via the rotation axis of the table, the table has 180. Even when it is swiveled, the contact member that has been in contact with the cam follower is separated from the cam follower, but the other contact member is then in contact with the cam follower. Thereby, even if the table rotates 180 degrees, any one of the pair of contact members is in contact with the cam follower, so that vibrations generated in the vertical direction of the table can always be suppressed. Furthermore, since each contact member is provided with a continuous movement means, the distance between each contact member and the cam follower can be adjusted separately. As a result, the entire table can be kept horizontal even if the tilt and vibration generated in the table are not uniform left and right.

  In addition, since the machine tool according to the eleventh aspect includes the table device according to any one of the first to tenth aspects, vibrations in the vertical direction of the table can be suppressed even if the table is rotated by the rotating means. Thereby, it can prevent that the position of the workpiece hold | maintained on the table shifts | deviates.

  Hereinafter, a machining center 1 according to an embodiment of the present invention will be described with reference to the drawings. 1 is an overall perspective view of the machining center 1, FIG. 2 is an overall perspective view of the table device 30, FIG. 3 is a right side view of the table device 30, and FIG. 4 is a table shown in FIG. 5 is a longitudinal sectional view of the device 30, FIG. 5 is a front view of the table device 30, FIG. 6 is a plan view of the table device 30, and FIG. 7 is a bottom view of the table device 30. FIG. 9 is a partially enlarged view around the block unit 60 shown in FIG. 5, FIG. 9 is a partially enlarged view around the block unit 60 shown in FIG. 7, and FIG. 10 is a perspective view of the table support block 65.

  In FIG. 1, the diagonally lower left side is the front side of the machining center 1, the diagonally upper right side is the rear side of the machining center 1, the diagonally lower right side is the right side of the machining center 1, and the diagonally upper left side is the left side of the machining center 1. Further, in FIG. 2, the diagonally lower left side is the front side of the table device 30, the diagonally upper right side is the rear side of the table device 30, the diagonally lower right side is the right side of the table device 30, and the diagonally upper left side is the table device 30. On the left side. Further, the X-axis direction indicates the left-right direction of the machining center 1, the Y-axis direction indicates the front-rear direction of the machining center 1, and the Z-axis direction indicates the vertical direction of the machining center 1.

  The machining center 1 according to the present embodiment moves a workpiece (not shown) and a tool relative to each other to perform desired machining (for example, “boring”, “milling”, “hole” Machine tools for performing “vacancy”, “cutting” and the like. Further, as shown in FIG. 1, the machining center 1 includes a table device 30 having a rotary table 33 rotatably supported on a base 2, and the table device 30 is provided at both end portions of the rotary table 33. It has a vibration suppression mechanism that can suppress vertical vibration. And the table apparatus 30 provided with this vibration suppression mechanism is the characteristics of this invention.

  First, the overall structure of the machining center 1 will be schematically described. As shown in FIG. 1, the machining center 1 includes a metal base 2 at the bottom. The base 2 is formed in a substantially rectangular parallelepiped shape by pouring a metal material such as cast iron into a mold, and leg portions 2a are provided at four corners at the lower part thereof. Then, the machining center 1 is arranged by installing these four legs 2a on the floor of a factory or the like. In addition, the core portion of the base 2 is so-called cut-out molding (frame structure with ribs) in order to reduce the weight and increase the strength. Further, the upper front side of the base 2 is formed in a mountain shape having a high central portion in the width direction and inclined toward both sides. Thereby, chips, coolant, and the like falling on the upper portion of the base 2 flow toward both sides in the width direction of the base 2.

  Furthermore, a moving device 5 is provided near the upper front of the base 2. The moving device 5 includes an X-axis rail 5a, a Y-axis rail (not shown), and a support base 5b that moves along the X-axis rail 5a and the Y-axis rail. A table device 30, which is a feature of the present invention and includes a rotary table 33, is fixed on the support base 5 b of the moving device 5. The table device 30 will be described later. On the other hand, a main base 4 is erected on the upper rear side of the base 2, and a horizontally long Y-axis table 6 that is movable in the front-rear direction of the base 2 on a Y-axis rail (not shown) on the main base 4. Is placed. The Y-axis table 6 is configured to reciprocate along the Y-axis direction by driving a Y-axis motor (not shown). Further, an X-axis rail (not shown) that is long in the X-axis direction is provided on the Y-axis table 6, and the vertically long column 7 can reciprocate in the left-right direction of the base 2 along the X-axis rail. Has been placed. Further, the column 7 is configured to be capable of reciprocating along the X-axis direction by driving an X-axis motor (not shown). A column cover 12 made of metal is detachably fixed to the front surface, the left and right side surfaces, and the upper surface of the column 7. Thereby, the column 7 and the column cover 12 move integrally back and forth.

  Further, on the front side of the column 7, a spindle (not shown) is mounted at the tip, and a main shaft 8 that is movable in the vertical direction is provided. Further, on the right side of the column 7, a tool changer 9 is provided for exchanging the tool mounted on the tip of the main shaft 8 with another tool. The tool changer 9 is formed in a substantially oval shape that is horizontally long when viewed from the side, and includes a tool magazine 9a that stores and holds a large number of tools. Further, at the lower front part of the tool magazine 9a, there is a tool exchange position (not shown) for exchanging the tool mounted on the tip of the spindle 8 moved to the raised position with another tool stored in the tool magazine 9a. Is provided. In this way, when the tool mounted on the tip of the spindle 8 rotates at high speed, “milling”, “boring”, “drilling” and the like are performed on the work held on the rotary table 33 of the table device 30. Can be processed.

  Furthermore, between the left and right sides of the column cover 12 and the left and right side moving ends of the Y-axis table 6, left and right telescopic (telescopic) dustproof covers 15a and 15b are provided. These dust-proof covers 15a and 15b prevent the chips from adhering to the Y-axis table 6 by covering the Y-axis table 6 so that the upper surface and the like of the column 7 are not exposed when the column 7 moves left and right. Is. The dust-proof covers 15a and 15b are inclined plate portions 19a that are gradually inclined higher toward the rear with respect to the upper surface (horizontal plane) of the Y-axis table 6, and vertical plates that extend vertically downward from the front ends of the inclined plate portions 19a. It is comprised from the part 19b. Thereby, the chips falling on the dustproof covers 15a and 15b can be dropped along the shapes of the inclined plate portions 19a and 19b.

  Further, on the back side of the base 2 and the column 7, a rear device unit 10 including a liquid supply unit such as a coolant liquid, a power source unit, a control unit, and the like is disposed. The rear device unit 10 also functions as a control unit that controls the rotation operation of the table device 30. Further, a back cover 16 that is horizontally long is provided between the front surface of the rear device unit 10 and the rear end of the Y-axis table 6 so as to extend over the entire length of the Y-axis table 6 (length in the left-right direction). Yes. The back cover 16 is configured such that a protective plate 18 such as a metal plate is stretched on the front side of a plurality of support columns 17 that are erected on the Y-axis table 6 at an appropriate interval. Instead of the protective plate 18, for example, a flexible cloth plate made of a synthetic resin made of aromatic polyamide fiber (aramid fiber) having high tensile strength and high chemical resistance may be stretched.

  Furthermore, an inclined cover 19 that is inclined obliquely downward toward the front is fixed to the lower end portion of the front surface of the back cover 16 over the entire length in the longitudinal direction (left-right direction). The inclined cover 19 is disposed so as to overlap the upper surface of the rear portion of the inclined plate portion 19a in the dustproof covers 15a and 15b, and the middle portion of the inclined cover 19 is formed between the rear end of the column cover 12 and the back cover 16. It arrange | positions so that the clearance gap between may be covered.

  In addition, the upper portion of the base 2 covers and protects the column 7, the main shaft 8, the tool changer 9, the table device 30, and the like, and also prevents a dust from being scattered outside. 11 is provided. The splash cover 11 is formed of a metal plate, and an opening 13 (only the front side is shown in FIG. 1) is formed on the front surface and the left and right surfaces of the splash cover 11. Each of these openings 13 is provided with a sliding door type door or a drop-in door so that it can be opened and closed. By opening these doors, a work magazine attached to the rotary table 33 can be attached and detached, and a tool magazine of the tool changer 9 can be used. The tool stored in 9a can be replaced, chips can be removed, and other maintenance operations can be performed.

  Next, the table device 30 that is a feature of the present invention will be described with reference to FIGS. As shown in FIG. 2, the table device 30 of the present embodiment is arranged on a substantially rectangular parallelepiped metal base 32 and an upper portion of the base 32 to hold the workpiece on the upper surface and at the 0 degree position and the 180 degree position. And a rotary table 33 having a substantially rectangular shape in plan view that reciprocally swivels between. The table device 30 includes a positioning adjustment mechanism that rotates and rotates the rotary table 33 by 180 degrees clockwise (clockwise) and counterclockwise (counterclockwise), and a vertical vibration of the rotary table 33. And a vibration suppressing mechanism for suppressing the vibration. The positioning adjustment mechanism and vibration suppression mechanism of the rotary table 33 will be described in detail later.

  First, as shown in FIGS. 2 and 6, the rotary table 33 is formed in a substantially rectangular shape in plan view that is slightly longer in the front-rear direction. A concave portion 33a having a circular shape in a plan view and serving as a rotation axis is provided at a substantially central portion of the upper surface. Furthermore, on the upper surface of the rotary table 33, a key groove 34 that extends in the front-rear direction, and attaches and fixes the workpiece directly or indirectly with a jig, and extends in the left-right direction, and has a recess 33a. A pair of key grooves 35 and 35 are formed at the center. Further, the corners of the four corners of the rotary table 33 are sharpened.

  On the other hand, as shown in FIGS. 2 and 3, the base 32 is formed in a substantially rectangular parallelepiped shape by pouring a metal material such as cast iron into the mold, and leg portions 32a are provided at the four corners at the bottom. Yes. And these four leg parts 32a are fixed on the support stand 5b of the moving apparatus 5 shown in FIG. Furthermore, as with the base 2, the base 32 has a core portion that is thinned (a frame structure using ribs) to reduce the weight and increase the strength.

  Next, the internal structure of the base 32 will be described. As shown in FIG. 4, a spindle 43 is erected in a substantially central portion of the base 32 through a bearing 44 so as to be rotatable. Further, a boss portion 43a is provided at the lower portion of the spindle 43, and a large gear 50 is fitted in the boss portion 43a. The large gear 50 is rotatably arranged in the hollow portion 51 of the base 32 and is rotated integrally with the spindle 43 by the mounting bolts 36 and 36 inserted from the upper surface of the rotary table 33. It is fixed. Further, an outer bearing retainer 45 and an inner bearing retainer 46 for holding the bearing 44 are provided on the upper surface of the base 32 and the lower surface of the turntable 33, and the circle of the turntable 33 is disposed on the upper and lower surfaces of the outer bearing retainer 45. Seal members 47 and 48 are respectively inserted between the circumferential lower surface groove and the circumferential upper surface groove of the base 32. The spindle 43 corresponds to a “support portion”.

  As shown in FIGS. 6 and 7, a drive motor 37 capable of forward and reverse rotation is disposed outside the base 32. As shown in FIG. 6, a drive shaft 38 is connected to the drive motor 37. The drive shaft 38 extends substantially horizontally through the hollow portion 51 (see FIG. 4), and its tip portion. Is provided with a gear 39. Further, as shown in FIG. 4, the gear 39 is engaged with a tooth portion 50 a formed on the lower surface of the large gear 50. As a result, when the drive motor 37 is driven, the drive shaft 38 rotates and the gear 39 rotates, and the gear portion 50a meshes with the gear 39 and the large gear 50 rotates. Then, the spindle 43 fixed integrally with the large gear 50 rotates so that the rotary table 33 rotates. The drive motor 37, the drive shaft 38, the gear 39, and the large gear 50 shown in FIG. 4 correspond to “rotating means”.

  Next, the positioning adjustment mechanism of the rotary table 33 will be described. As shown in FIG. 6, on the outer surface of the base 32, a first stopper piece 90a and a second stopper piece 90b having a substantially rectangular shape in plan view have a predetermined angle (for example, 90 degrees) across the recess 33a of the rotary table 33. ) Separately, they are fixed at the same radial position with bolts or the like. On the other hand, on the lower surface side of the rotary table 33, when the rotary table 33 is rotated counterclockwise in FIG. 6, the rotary table 33 is positioned at a predetermined position by contacting the second stopper piece 90b. The first positioning means 80a and the second positioning means 80b for contacting the first stopper piece 90a and positioning the rotary table 33 at a predetermined position when the rotary table 33 is rotated clockwise are respectively fixed. ing.

  Further, although not shown, the table device 30 is provided with a lock mechanism for fixing (locking) the rotary table 33 at a predetermined index position, and the rotary table 33 is fixed at a predetermined index position by the lock mechanism. It is designed to be fixed firmly. Then, with the positioning adjusting mechanism having such a configuration, the rotary table 33 is reciprocally swung between 0 degrees and 180 degrees clockwise and counterclockwise, thereby processing one work on the rotary table 33. On the other hand, it is possible to perform an operation such as removing the finished product and replacing the unprocessed workpiece on the other side.

  Next, the vibration suppression mechanism of the rotary table 33 will be described. Since this vibration suppression mechanism is composed of a mechanism on the base 32 side and a mechanism on the rotary table 33 side, it will be described separately for each location.

  First, the mechanism on the base 32 side will be described. As shown in FIGS. 2 to 5, a support arm 62 that is formed in a pyramid shape protruding toward the front of the base 32 and having its tip cut off is provided at the center of the outer surface of the front surface of the base 32. ing. Further, a cam follower 63 having a needle shaft (not shown) inside is supported at the tip of the support arm 62, and the axis of the cam follower 63 is parallel to the front-rear direction of the base 32. Thereby, as shown in FIG. 5, the cam follower 63 is configured to rotate clockwise or counterclockwise when the base 32 is viewed from the front. And the contact surface 66 of the table support block 65 mentioned later contacts the outer peripheral surface of such a cam follower 63. FIG. The support arm 62 and the cam follower 63 shown in FIGS. 2 to 5 correspond to an “auxiliary support portion”.

  Next, the mechanism on the rotary table 33 side will be described. As shown in FIGS. 3 and 7, the rotary table 33 has a lower surface near the front end portion and a lower surface near the rear end portion. Block portions 60 are provided for pushing up the lower surface or the lower surface in the vicinity of the rear end portion to suppress vertical vibration of the rotary table 33. As shown in FIGS. 5, 8, and 9, the block portion 60 is supported so as to be movable in a direction parallel to the longitudinal direction of the front end portion (or rear end portion) of the rotary table 33, and the cam follower 63. A substantially wedge-shaped table support block 65 that contacts the upper outer peripheral surface of the rotary table 33 and supports the front end portion (or rear end portion) of the rotary table 33 substantially horizontally, and a contact portion 69 of the table support block 65. And a bowl-shaped block position adjusting screw 72 for continuously adjusting the position of the table support block 65, and an adjusting screw support portion 70 for supporting the block position adjusting screw 72 so as to be movable toward the table support block 65. Has been.

  Next, each part which comprises the block part 60 is demonstrated. In addition, as shown in FIG. 7, the structure of the block part 60 provided in the lower surface near the front end part of the turntable 33 and the structure of the block part 60 provided in the lower surface near the rear end part of the turntable 33 are Since they are the same as each other, only the structure of the block portion 60 provided on the lower surface near the front end portion of the turntable 33 will be described here.

  First, the table support block 65 will be described. As shown in FIG. 10, the table support block 65 has a substantially rectangular parallelepiped block rear end portion 65a and a bottom surface inclined obliquely upward from the rear end continuous to the front portion of the block rear end portion 65a toward the front end. In addition, the entire block intermediate portion 65b formed in a wedge shape is continuous with the front portion of the block intermediate portion 65b, and is extended to a predetermined length substantially horizontally toward the front while maintaining the thickness of the front portion. And a substantially rectangular parallelepiped block tip 65c. The inclined surface at the bottom of the block intermediate portion 65 b serves as a contact surface 66 that contacts the outer peripheral surface of the cam follower 63. Further, an abutting portion 69 for abutting the tip end portion of the block position adjusting screw 72 (see FIG. 7) is provided on the back surface of the block rear end portion 65a. The table support block 65 shown in FIG. 10 corresponds to a “contact member”.

  Next, the guide means of the table support block 65 will be described. As shown in FIG. 10, the block rear end portion 65a of the table support block 65 is provided with a pair of elliptical guide holes 68, 68 penetrating the top surface and the bottom surface and parallel to the width direction of the block. It has been. The guide holes 68 are formed in an elliptical shape having a long diameter in the longitudinal direction of the block rear end portion 65a. On the other hand, a pair of guide holes 68 and 68 having an elliptical shape in plan view that penetrates the top surface and the bottom surface and is parallel to the width direction of the block are also provided in the block tip portion 65c. A metal sliding plate 77 (see FIG. 8) for sliding with respect to the lower surface of the rotary table 33 is fixed to the upper surface of the table support block 65 having such a structure. . Although not shown, the sliding plate 77 is also provided with guide holes having the same shape as the guide holes 68, and these guide holes and the guide holes 68 of the table support block 65 communicate with each other vertically. Further, a support pin 67 is provided near the rear portion of the bottom surface of the block rear end portion 65a so as to protrude vertically downward from the bottom surface. As shown in FIG. 8, one end of a substantially cylindrical spring 75 is hung on the support pin 67, and the other end is hung on a support pin 71 of an adjustment screw support 70 described later. ing.

  Then, as shown in FIG. 9, mounting bolts 88 are provided in the table support block 68 in the four guide holes 68 respectively provided in the block rear end portion 65a and the block front end portion 65c of the table support block 65 having the above structure. Each of them is inserted from the lower side of 65 and fixed to four holes (not shown) formed in the lower surface of the rotary table 33. Then, by tightening the mounting bolt 88, the table support block 65 is fixed to the lower surface of the rotary table 33 via the sliding plate 77. On the contrary, the table support block 65 is separated from the lower surface of the rotary table 33 by loosening all the mounting bolts 88. The table support block 65 can move within the range of the major diameter of the guide hole 68 with reference to the position of the mounting bolt 88 inserted into the guide hole 68. Thereby, the table support block 65 is guided along the inner peripheral surface of its own guide hole 68. The guide means of the table support block 65 is not limited to this, and a guide rail or the like that holds the table support block 65 and guides it in one direction may be provided on the lower surface of the rotary table 33. The guide holes 68 and the mounting bolts 88 shown in FIG. 9 correspond to “guide means”.

  When the table support block 65 is in a movable state, the table support block 65 is pulled back to the adjustment screw support portion 70 side by a spring 75 as shown in FIGS. Therefore, the tip of the block position adjusting screw 72 comes into contact with the contact portion 69 of the table support block 65. After that, positioning adjustment of the table support block 65 is performed.

  Next, the block position adjusting screw 72 and the adjusting screw support part 70 will be described. As shown in FIGS. 8 and 9, the block position adjusting screw 72 is formed in a bowl shape and abuts against the abutting portion 69 of the table support block 65 and moves toward the cam follower 63 side. On the other hand, the adjustment screw support portion 70 protrudes substantially vertically downward from the lower surface near the front end portion (near the rear end portion) of the rotary table 33, and supports the block position adjustment screw 72 so as to be movable toward the table support block 65. Support holes (not shown). A thread groove into which a thread on the outer peripheral surface of the block position adjusting screw 72 fits is cut in the inner surface of the support hole. Thereby, the position of the block position adjusting screw 72 can be continuously moved toward the table support block 65 side by screwing the block position adjusting screw 72 toward the support hole.

  A support pin 71 that protrudes substantially vertically downward is provided below the adjustment screw support portion 70. A substantially cylindrical spring 75 is stretched between the support pin 67 of the table support block 65 and the support pin 71 of the adjustment screw support 70. Therefore, the table support block 65 is always urged by the spring 75 toward the adjustment screw support portion 70 side (the side opposite to the cam follower 63 side).

  Next, a method for adjusting the positioning of the table support block 65 will be described. The positioning adjustment of the table support block 65 is performed in a state where the rotary table 33 is positioned and fixed by the positioning adjustment mechanism of the table device 30. The table support block 65 is provided at two locations, a lower surface near the front end of the rotary table 33 and a lower surface near the rear end, and positioning adjustment of each table support block 65 is performed at each location. To do. Since the positioning adjustment of each table support block 65 is performed by the same method, only the positioning adjustment of the table support block 65 provided on the lower surface near the front end of the rotary table 33 will be described in this description.

  First, as shown in FIG. 9, all four mounting bolts 88 are loosened, and the table support block 65 is made movable. Then, as shown in FIGS. 8 and 9, the table support block 65 is pulled back toward the adjustment screw support portion 70 by the spring 75, so that the table support block 65 is brought into contact with the tip of the block position adjustment screw 72. The contact portion 69 comes into contact. In this state, the block position adjusting screw 72 is screwed toward the support hole. Then, the tip end portion of the block position adjusting screw 72 can be moved toward the cam follower 63 side while pushing the contact portion 69 of the table support block 65. Further, since the table support block 65 is guided so as to move within the range of the long diameter along the four guide holes 68, it can be reliably moved toward the cam follower 63 side.

  Then, the table support block 65 is moved until the contact surface 66 of the table support block 65 contacts the upper part of the outer peripheral surface of the cam follower 63. Then, the block position adjusting screw 72 is fixed to the adjusting screw support portion 70 by tightening the nut 73 at the position where the contact surface 66 of the table support block 65 contacts the upper part of the outer peripheral surface of the cam follower 63. Thereby, the block position adjusting screw 72 is positioned and the table support block 65 is positioned. Then, in order to firmly fix the positioned table support block 65 to the lower surface of the rotary table 33, the four mounting bolts 88 are tightened to complete the positioning operation of the table support block 65.

  In this way, the block position adjusting screw 72 can be continuously moved toward the table support block 65 by screwing the block position adjusting screw 72 toward the support hole of the adjustment screw support portion 70. That is, the position of the table support block 65 moved by being pushed by the block position adjusting screw 72 can be continuously moved toward the cam follower 63 side. Thereby, even if it is adjustment of the slight distance between the upper outer peripheral surface of the cam follower 63, and the contact surface 66 of the table support block 65, the fine adjustment according to each condition can be performed. Further, since the contact surface 66 of the table support block 65 is inclined obliquely upward toward the cam follower 63 side, the contact surface 66 of the table support block 65 is gradually moved to the cam follower 63 side. The space between the contact surface 66 and the outer peripheral surface of the cam follower 63 can be gradually reduced. Thereby, the position of the table support block 65 can be adjusted continuously. The adjustment screw support portion 70 and the block position adjustment screw 72 shown in FIGS. 8 and 9 correspond to “moving means”.

  Further, since the position of the table support block 65 can be adjusted by the block position adjusting screw 72 while the rotary table 33 is positioned by the positioning mechanism, the rotary table 33 is purposely rotated to separate the table support block 65 from the cam follower 63. There is no need to make adjustments. As a result, the position of the table support block 65 can be quickly adjusted during work at the machining center 1.

  As described above, the machining center 1 of this embodiment includes the table device 30 having the rotary table 33 that is rotatably supported. The table device 30 has a vibration suppressing mechanism that can suppress the vertical vibration of the rotary table 33. In this vibration suppression mechanism, cam followers 63 that are pivotally supported on the front end portion of the support arm 62 provided on the base 32 side are provided on the lower surface near the front end portion and the lower surface near the rear end portion of the rotary table 33, respectively. The contact surface 66 of the table support block 65 is brought into contact. Thereby, for example, it is possible to suppress vertical vibrations of the rotary table 33 that occur during work attachment / detachment work. In addition, when the area of the turntable 33 is increased in order to widen the processing range, the overhang of the turntable 33 increases with respect to the base 32. Therefore, the work rotates when the work or jig is placed on the turntable 33. Although the table 33 bends, the front end portion (rear end portion) of the rotary table 33 is supported from below by the table support block 65 coming into contact with the cam follower 63 on the base 32 side. It can be held almost horizontally.

  Further, the table support block 65 is supported so as to be movable toward the cam follower 63 side. The table support block 65 is brought into contact with the block position adjusting screw 72 movably supported by the adjusting screw support portion 70 and is continuously moved by being pushed toward the cam follower 63 side. Thereby, even if it is adjustment of the slight distance between the outer peripheral surface of the cam follower 63, and the back surface of the table support block 65, delicate adjustment can be performed according to each condition. Further, since the position of the table support block 65 can be adjusted by the block position adjusting screw 72 while the rotary table 33 is positioned by the positioning mechanism, the rotary table 33 is purposely rotated to separate the table support block 65 from the cam follower 63. There is no need to make adjustments.

  Next, two modified examples in which the structure of the table device 30 is changed will be described. 11 is a front view of the table device 300 according to the first modification, FIG. 12 is a partial enlarged view showing the periphery of the block unit 116 of the table device 300 according to the first modification, and FIG. 13 illustrates the table according to the second modification. 14 is a front view of the apparatus 350, and FIG. 14 is a right side view of the table apparatus 350 according to the second modification. In addition, about the site | part which is common in the said embodiment, a same sign is attached | subjected and demonstrated.

  First, Modification 1 will be described. The table device 300 of the first modification shown in FIGS. 11 and 12 includes block portions 116 at two locations, a lower surface in the vicinity of the front end of the rotary table 33 and a lower surface in the vicinity of the rear end. And the block part 116 is comprised by the table support plate 126 which comprised the shape of the table support block 65 in the said embodiment in flat form, and the guide mechanism which moves this table support plate 126 to an up-down direction. As shown in FIG. 12, the table support plate 126 is formed in a substantially rectangular shape in plan view, and its lower surface serves as a contact surface for contacting the upper outer peripheral surface of the cam follower 63. In addition, holes (not shown) are provided in the vicinity of the four corners of the table support plate 126, and mounting bolts 188 are inserted into the holes from the lower side of the table support plate 126. Further, the tip ends of the mounting bolts 188 are fixed to the lower surface near the front end portion of the rotary table 33, respectively. By such a guide mechanism, the table support plate 126 is guided by these four mounting bolts 188 in the vertical direction while maintaining a substantially horizontal state between the lower surface of the rotary table 33 and the upper outer peripheral surface of the cam follower 63. Is done. Although not shown, a table support plate 126 is similarly provided on the lower surface near the rear end of the rotary table 33.

  Further, as shown in FIG. 11, a nut 190 disposed on the lower side of the table support plate 126 and a nut 191 disposed on the upper side are fitted on the four mounting bolts 188, respectively. The table support plate 126 guided by the four mounting bolts 188 is positioned and fixed by adjusting the positions of these nuts 190 and nuts 191. As a result, the position of the table support plate 126 can be continuously adjusted along the four mounting bolts 188, so that the distance between the lower surface of the table support plate 126 and the upper outer peripheral surface of the cam follower 63 is finely adjusted. be able to. The table support plate 126 shown in FIGS. 11 and 12 corresponds to a “contact member”, and the four mounting bolts 188 and the nuts 190 and 191 correspond to “guide means”.

  Next, Modification 2 will be described. The table device 350 of the second modification shown in FIGS. 13 and 14 is configured by arranging the position of the cam follower 63 and the position of the block portion 60 having the table support block 65 in the above embodiment in the opposite directions. . As shown in FIGS. 13 and 14, an L-shaped support arm 631 a is provided on the lower surface near the front end portion of the turntable 33 and extends downward and the front end portion is folded forward. An outer cam follower 631 is pivotally supported by the portion. On the other hand, an L-shaped support arm 632a that extends downward and has a distal end folded back is provided on the lower surface of the rear end portion side of the rotary table 33 and near the recess 33a. An inner cam follower 632 is pivotally supported by the portion. Thereby, when the turntable 33 rotates, the movement path (rotation locus) of the outer cam follower 631 and the movement path (rotation locus) of the inner cam follower 632 are shifted from each other.

  In addition, a substantially triangular columnar support arm 620 is provided on the front surface of the base 320 of the table device 350 and protrudes forward and has a substantially horizontal fixing surface at the top. The outer block 160 and the inner block 260 are fixed to the fixing surface of the support arm 620 in opposite directions. The outer block portion 160 is supported so as to be movable in a direction parallel to the left-right direction of the front end portion of the base 320, and has a wedge-shaped table support block 165 that abuts the lower outer peripheral surface of the outer cam follower 631. A hook-like block position adjusting screw 172 that adjusts the position of the table support block 165 by contacting the contact portion 169 of the support block 165, and the block position adjusting screw 172 are movably supported toward the table support block 165. An adjustment screw support 170 to be positioned, a nut 173 for positioning and fixing the block position adjustment screw 172 to the adjustment screw support 170, and a spring 175 spanned between the adjustment screw support 170 and the table support block 165. I have. Further, since the table support block 165 is arranged so that the contact surface 165a is on the upper side, the lower outer peripheral surface of the outer cam follower 631 is in contact with the corresponding contact surface 165a. The outer block 160 and the inner block 260 shown in FIGS. 13 and 14 correspond to “continuous adjustment mechanism”, and the table support blocks 165 and 265 correspond to “contact members”.

  On the other hand, the inner block 260 is also supported so as to be movable in a direction parallel to the left-right direction of the front end portion of the base 320, and a wedge-shaped table support block 265 that contacts the lower outer peripheral surface of the inner cam follower 632; A hook-like block position adjustment screw 272 that adjusts the position of the table support block 165 by contacting the contact portion 269 of the table support block 265, and the block position adjustment screw 272 are movable toward the table support block 265. An adjustment screw support portion 270 to be supported, a nut 273 for positioning and fixing the block position adjustment screw 272 to the adjustment screw support portion 270, and a spring 275 spanned between the adjustment screw support portion 270 and the table support block 265, It has. Further, since the table support block 265 is arranged so that the contact surface 265a is on the upper side, the lower outer peripheral surface of the inner cam follower 632 contacts the corresponding contact surface 265a. In the outer block 160 and the inner block 260, sliding plates 177 and 277 (see FIG. 14) are fixed to the lower surfaces of the table support blocks 165 and 265, respectively.

  In the table device 350 having the above-described configuration, when the rotary table 33 reciprocates between 0 degrees and 180 degrees, the outer cam follower 631 contacts the contact surface 165a of the table support block 165 of the outer block portion 160. Further, when the rotary table 33 turns, the inner cam follower 632 contacts the contact surface 265a of the table support block 265 of the inner block portion 260 this time. As described above, since the movement path of the outer cam follower 631 and the rotation path of the inner cam follower 632 are deviated from each other, the inner cam follower 632 does not collide with the outer block portion 160, and the outer cam follower 631 does not collide with the inner block portion. No collision with 260. Therefore, even such a table device 350 can produce the same effects as the table device 30 of the above embodiment.

  Note that the present invention is not limited to the above-described embodiments and modifications, and various modifications can be made. For example, although the cam follower 63 is provided on the support arm 62 of the base 32 of the table device 30, a cylindrical block may be used, and a shape that does not damage the contact surface 66 of the table support block 65 is preferable.

  Moreover, although the rotary table 33 of the table apparatus 30 of this embodiment reciprocates between 0 degree | times and 180 degree | times, you may rotate 360 degree | times.

  Further, for example, the block position adjustment screw 72, the nut 73, and the adjustment screw support portion 70 may be removed from the block portion 60 shown in FIG. 8, and the table support block 65 may be moved manually.

  Further, in the present embodiment, the table is constituted by the rotary table 33, but it is also effective for a table that does not rotate.

  The machine tool of the present invention can be applied not only to a vertical machining center but also to a horizontal machining center.

1 is an overall perspective view of a machining center 1. 1 is an overall perspective view of a table device 30. FIG. 4 is a right side view of the table device 30. FIG. It is a longitudinal cross-sectional view of the table apparatus 30 shown in FIG. 3 is a front view of the table device 30. FIG. 3 is a plan view of the table device 30. FIG. 4 is a bottom view of the table device 30. FIG. It is the elements on larger scale of the block part 60 periphery shown in FIG. It is the elements on larger scale of the block part 60 periphery shown in FIG. It is a perspective view of the table support block 65. FIG. It is a front view of the table apparatus 300 of the modification 1. It is the elements on larger scale which show the block part 116 periphery of the table apparatus 300 of the modification 1. FIG. It is a front view of the table apparatus 350 of the modification 2. It is a right view of the table apparatus 350 of the modification 2.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Machining center 30 Table apparatus 33 Rotary table 37 Drive motor 38 Drive shaft 39 Gear 43 Spindle 50 Large gear 60 Block part 62 Support arm 63 Cam follower 65 Table support block 66 Contact surface 68 Guide hole 70 Adjustment screw support part 72 Block position adjustment screw 73 Nut 75 Spring 88 Mounting bolt 116 Block portion 126 Table support plate 160 Outer block portion 165 Table support block 165a Abutting surface 170 Adjustment screw support portion 172 Block position adjustment screw 173 Nut 175 Spring 188 Mounting bolt 190 Nut 191 Nut 260 Inner block Part 265 Table support block 265a Abutting surface 270 Adjustment screw support part 272 Block position adjustment screw 273 Nut 275 Spring 300 Table 350 table device 620 support arm 631 outside cam follower 632 inside the cam follower

Claims (11)

A table horizontally supported by the support,
An auxiliary support part that abuts the lower end of the table and supports the table as an auxiliary, and suppresses vibration generated in the table;
A table device comprising: a continuous adjustment mechanism capable of continuously adjusting a distance between the tip portion of the auxiliary support portion and the lower surface of the table. The continuous adjustment mechanism is
A contact member provided on the lower surface of the table;
2. The apparatus according to claim 1, further comprising a continuous moving unit that continuously moves the contact member to adjust a distance between the contact member and a tip of the auxiliary support portion. Table device. A cam follower is provided at the tip of the auxiliary support part,
The table apparatus according to claim 2, wherein a lower portion of the abutting member abuts on an upper portion of the cam follower. The continuous moving means includes
Guide means for guiding the contact member toward the cam follower;
The table apparatus according to claim 3, further comprising a moving unit that moves the abutting member toward the cam follower along the guide unit.   5. The table apparatus according to claim 4, wherein the continuous moving means includes a spring that pulls back the contact member in a direction away from the cam follower along the guide means. The guide means is provided along the lower surface of the table,
The lower part of the contact member is provided with a contact surface that contacts the upper part of the cam follower,
The table device according to claim 4, wherein the contact surface is inclined obliquely upward toward the cam follower side. The continuous adjustment mechanism is
A contact member provided at a tip of the auxiliary support part;
The table apparatus according to claim 1, further comprising a continuous moving unit that continuously moves the contact member to adjust a distance between the contact member and a lower surface of the table. A cam follower is provided on the lower surface of the table,
The table device according to claim 7, wherein an upper portion of the contact member is in contact with a lower portion of the cam follower. Rotating means for rotating the support part,
The table apparatus according to claim 1, wherein the table is rotated by the rotation unit rotating the support portion.   The table apparatus according to claim 9, wherein the contact member and the continuous movement unit are provided in a pair via a rotation axis of the table. A machine tool comprising the table device according to claim 1.

Images