JP2009279734A - Mass centering machining device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a mass centering machining device capable of being adapted a plurality of kinds of workpieces having different dimensions. <P>SOLUTION: This mass centering machining device 3 is provided with a holding unit for holding the workpiece Cs and a machining unit for opening a center hole in the workpiece Cs. The holding unit has a pair of receiving members 16 adjacently arranged in the horizontal direction to form a V-shaped receiving part 20 for receiving the workpiece Cs from a lower side, a clamping member 17 pressed by the workpiece Cs received by the pair of receiving members 16 from the above, and a moving mechanism 18 for individually and horizontally moving each of the receiving members 16 in an array direction X1 of the receiving members 16. The moving mechanism 18 is capable of adjusting a space of the pair of receiving members 16 in the array direction X1 and a position of each of the receiving members 16 in the array direction X1 by individually and horizontally moving each of the receiving members 16. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a mass centering processing apparatus for forming a centering hole for centering as a processing reference in a rotating body such as a crankshaft.

In a manufacturing process of a crankshaft used for an engine of a vehicle such as an automobile, a center hole is formed in a work (an intermediate body of a crankshaft) integrally formed by casting or forging. The center hole is drilled on the inertia spindle of the workpiece, and necessary processing thereafter is performed using the center hole as a machining reference.
The machining of the center hole for the workpiece is performed by an apparatus called a mass centering machine, for example. The mass centering machine rotates the workpiece to obtain the inertia spindle, and processes the center hole based on the measurement result. As such a mass centering machine, for example, there is a two-station type machine in which a mass centering measuring device for measuring unbalance of a workpiece and a mass centering processing device for making a center hole in a workpiece are set as two stations. Yes (see, for example, Patent Document 1).

The mass centering processing apparatus in Patent Document 1 is provided with a holding apparatus that holds a work and a processing apparatus that makes a center hole in the work. The holding device includes a pair of workpiece receivers that receive the workpiece from below, and a pair of clamp members that are pressed against the workpiece received by the pair of workpiece receivers from above. Each workpiece receiver is movable and is driven by a servo motor connected through a cam mechanism. The holding device can finely adjust the holding position of the workpiece by moving these workpiece receivers. Therefore, by finely adjusting the holding position of the workpiece based on the measurement result, a center hole can be formed on the inertia spindle of the workpiece.
Japanese Patent No. 3523573 (FIG. 2)

  The mass centering machine is desired to be able to handle a plurality of types of workpieces having different dimensions. However, in the mass centering machine described in Patent Document 1, it is difficult to handle a plurality of types of workpieces having different dimensions. That is, in the holding device of the mass centering processing apparatus according to Patent Document 1, the workpiece holder cannot be moved greatly, and thus a workpiece having a greatly different dimension can not be held.

  The present invention has been made based on such a background, and a main object of the present invention is to provide a mass centering apparatus capable of handling a plurality of types of workpieces having different dimensions.

  The invention according to claim 1 is a mass centering apparatus for making a center hole on a measured inertial spindle of a workpiece, the holding unit holding the workpiece substantially horizontally, and at least the workpiece held by the holding unit. A processing unit having a function of making a center hole, and the holding unit includes a pair of receiving members disposed adjacent to each other in a horizontal direction forming a V-shaped receiving portion for receiving a workpiece from below, and a pair of holding members A clamp member that is pressed from above onto the workpiece received by the receiving member, and a moving mechanism that horizontally moves each receiving member in the arrangement direction of the receiving member, and the moving mechanism individually moves each receiving member. By horizontally moving the pair of receiving members in the arrangement direction and / or the position of each receiving member in the arrangement direction A mass centering processing apparatus characterized by may be adjusted.

According to a second aspect of the present invention, in the mass centering processing apparatus according to the first aspect, the moving mechanism is configured based on a measurement result of a workpiece performed in a previous stage before the workpiece is received by the pair of receiving members. A mass centering apparatus characterized by moving each receiving member.
According to a third aspect of the present invention, in the mass centering processing apparatus according to the first or second aspect of the present invention, the mass centering processing further includes a lubricating device that supplies a lubricant to a contact portion of each receiving member with the workpiece. Device.

  According to the first aspect of the present invention, the receiving members are individually horizontally moved by the moving mechanism to adjust the distance between the pair of receiving members in the arrangement direction and / or the position of each receiving member in the arrangement direction. Thus, the holding position of the workpiece by the holding unit can be changed to a desired position. Furthermore, by adjusting the distance between the pair of receiving members in the arrangement direction, it is possible to reliably hold a plurality of types of workpieces having greatly different dimensions of the held portion of the workpiece. For example, if the size of the held portion is large, the interval between the receiving members may be increased. If the size of the held portion is small, the interval between the receiving members may be decreased. Thereby, it can respond to the multiple types of workpiece | work from which a dimension differs. In the holding unit according to the present invention, the amount of movement of the receiving member can be increased as compared with a holding unit including a conventional cam mechanism, so that a workpiece having a wide range of dimensions can be held.

According to the second aspect of the present invention, since the receiving members are individually moved horizontally along the arrangement direction before the workpiece is received by the pair of receiving members, the receiving members are moved after the workpiece is received. Compared to the case, the processing time in the mass centering apparatus can be shortened. Thereby, productivity of a mass centering apparatus can be improved.
According to the third aspect of the present invention, since the lubricant can be supplied to the contact portion of each receiving member with the workpiece by the lubricating device, the contact portion is worn by friction between the workpiece and the contact portion. This can be suppressed or prevented. Further, when the workpiece and the contact portion are relatively moved, both can be smoothly moved relative to each other.

In the following, regarding the mass centering processing apparatus according to the embodiment of the present invention, the mass centering processing apparatus and the mass centering measuring apparatus for measuring the unbalance of the workpiece are set as two stations. A centering machine will be described as an example.
FIG. 1 is a schematic diagram illustrating a schematic configuration of a mass centering machine 1 including a mass centering processing device 3 according to an embodiment of the present invention. FIG. 2 is a front view of the crankshaft Cs. First, the configuration and operation of the entire mass centering machine 1 will be described.

  The mass centering machine 1 rotates the crankshaft Cs (workpiece), measures the unbalance, and performs center holes C1 (see FIG. 2) and other processing at both ends of the crankshaft Cs based on the measurement result. It is. As shown in FIG. 1, the mass centering machine 1 includes a mass centering measuring device 2 (measurement station) that measures the unbalance of the crankshaft Cs, and a mass centering process that processes the center hole C1 and the like at both ends of the crankshaft Cs. An apparatus 3 (processing station) and a conveying means 4 for conveying the crankshaft Cs while maintaining a substantially constant posture are provided. The mass centering measuring device 2, the mass centering processing device 3, and the conveying means 4 are controlled by a control device 5 including a microcomputer.

  At the measurement station, the crankshaft Cs is rotated around the rotation axis L1 (see FIG. 2) passing through both ends thereof, and the amount of vibration generated at this time is measured, whereby the rotation axis L1 and the inertial main shaft L2 (see FIG. 2) Deviation amount is required. The crankshaft Cs measured at the measurement station is integrally formed by casting or forging, for example, and corresponds to an intermediate body of the crankshaft Cs. The crankshaft Cs is carried into the measurement station by the transport means 4.

  On the other hand, in the machining station, a centering center hole C1 serving as a machining reference is formed at a predetermined position at or near the center of inertia at the end of the crankshaft Cs based on the measurement result at the measurement station. The crankshaft Cs having the center hole C1 is subjected to subsequent necessary processing with the center hole C1 as a processing reference. The crankshaft Cs measured at the measurement station is carried into the processing station by the transport means 4. Then, the crankshaft Cs that has been processed is unloaded from the processing station by the transport means 4.

  One feature of the mass centering apparatus 3 according to the present embodiment is that it can cope with a plurality of types of crankshafts Cs (workpieces) having different dimensions. More specifically, even in the case of a crankshaft Cs having different dimensions and overall lengths (lengths in the left-right direction in FIG. 2), the crankshaft Cs is held and centered at its end. The point is that the hole C1 can be formed. Hereinafter, the above-described feature points will be specifically described.

FIG. 3 is a schematic front view showing a schematic configuration of the mass centering apparatus 3.
The mass centering processing apparatus 3 includes a holding unit 6 that holds the crankshaft Cs and a processing unit 7 that performs a center hole C1 and other processing on the crankshaft Cs. The crankshaft Cs is held substantially horizontally with both ends supported by the holding unit 6.

  The holding unit 6 includes a first holding portion 8 that holds one end portion (right end portion in FIG. 3) of the crankshaft Cs and a second holding portion 9 that holds the other end portion of the crankshaft Cs. . The first and second holding portions 8 and 9 have, for example, substantially the same specifications, and are arranged at intervals in the horizontal direction. The first holding unit 8 is placed on the base B1 via an LM guide G1 extending in the left-right direction (left-right direction in FIG. 3) of the mass centering apparatus 3. The first holding unit 8 is movable in the left-right direction. Similarly, the second holding portion 9 is also placed on the base B1 via the LM guide G2 extending in the left-right direction, and is movable in the left-right direction. The 1st and 2nd holding | maintenance parts 8 and 9 are moved according to the full length of the crankshaft Cs.

  On the other hand, the processing unit 7 includes a first processing portion 10 that performs the center hole C1 and other processing on one end of the crankshaft Cs, and a second processing that performs the center hole C1 and other processing on the other end of the crankshaft Cs. Part 11. The 1st and 2nd process parts 10 and 11 are made into the substantially same specification, for example, and are arrange | positioned at intervals in the horizontal direction. The 1st and 2nd process parts 10 and 11 are facing the horizontal direction on both sides of the holding unit 6 grade | etc.,.

FIG. 4 is an illustrative external view of the mass centering apparatus 3 as viewed along the line IV-IV in FIG.
Referring to FIGS. 3 and 4, a rotation direction positioning mechanism 12 that positions the crankshaft Cs in the rotation direction is attached to the first holding unit 8 (the holding unit located on the right side in FIG. 3). As shown in FIG. 4, the rotational direction positioning mechanism 12 has a pair of clamping members 13. The pair of clamping members 13 are arranged side by side in the front-rear direction (the left-right direction in FIG. 4) of the mass centering apparatus 3. Each clamping member 13 is connected to the 1st holding | maintenance part 8 so that rotation is possible for the lower end part as a fulcrum. The pair of sandwiching members 13 rotate integrally with a lower end thereof as a fulcrum upon receiving a driving force from an actuator (not shown). By rotating the pair of clamping members 13, a part (crank pin) of the crankshaft Cs can be clamped by the upper ends of the pair of clamping members 13 and the crankshaft Cs can be positioned in the rotational direction.

  As shown in FIG. 3, an axial positioning mechanism 14 that positions the crankshaft Cs in the axial direction is disposed between the first holding unit 8 and the second holding unit 9. The axial positioning mechanism 14 has a pair of positioning members 15. The pair of positioning members 15 are arranged side by side in the left-right direction of the mass centering apparatus 3 (left-right direction in FIG. 3). Each positioning member 15 is held in the housing H1 so as to be movable in the left-right direction. The distance between the pair of positioning members 15 in the left-right direction is changed by an actuator (not shown). With the pair of positioning members 15 positioned between adjacent crank arms of the crankshaft Cs, the interval between the pair of positioning members 15 is widened, so that the crank arm is stretched from the inner side and the crankshaft Cs is moved in the axial direction. Can be positioned. The crankshaft Cs is positioned in the rotation direction and the axial direction by the rotation direction positioning mechanism 12 and the axial direction positioning mechanism 14 and then held by the first and second holding portions 8 and 9.

FIG. 5 is a schematic side view of the mass centering apparatus 3 viewed along the line VV in FIG. Below, the structure of the 1st holding | maintenance part 8 is demonstrated. Since the second holding unit 9 has substantially the same specifications as the first holding unit 8, the description thereof is omitted.
The first holding unit 8 includes a pair of receiving members 16 that receive the crankshaft Cs from below, a clamp member 17 that is pressed against the crankshaft Cs that is received by the pair of receiving members 16, and an arrangement direction X1 of the receiving members 16. A moving mechanism 18 that horizontally moves each receiving member 16 in the horizontal direction in FIG. 5 is provided. The ends of the crankshaft Cs are received by a pair of receiving members 16 and are further pressed and held from above by a clamp member 17.

  The pair of receiving members 16 have substantially the same shape (in the present embodiment, generally triangular). The pair of receiving members 16 are disposed opposite to each other in the horizontal direction on the housing H2. An inclined portion 19 that is inclined with respect to the vertical direction is provided at the upper end portion of each receiving member 16. The pair of inclined portions 19 face each other at an interval in the horizontal direction. The inclination angles of the pair of inclined portions 19 with respect to the vertical direction are, for example, equal to each other (for example, 45 degrees). The pair of inclined portions 19 form a V-shaped receiving portion 20 that receives the end portion of the crankshaft Cs from below, and cooperates with each other to support the end portion of the crankshaft Cs from below. A pad 21 in contact with the crankshaft Cs is attached to each inclined portion 19.

  Each receiving member 16 is held so as to be movable in the horizontal direction with respect to the housing H2. The distance between the pair of receiving members 16 in the arrangement direction X1 is changed by the moving mechanism 18. Further, the position of each receiving member 16 in the arrangement direction X1 is changed by the moving mechanism 18. By changing the distance between the pair of receiving members 16 in the arrangement direction X1 and / or the position of each receiving member 16 in the arrangement direction X1, the holding position of the crankshaft Cs by the first holding portion 8 can be adjusted. The same applies to the second holding unit 9. A method for adjusting the holding position of the crankshaft Cs by the holding portions 8 and 9 will be described later.

Next, the clamp member 17 and the related configuration will be described.
FIG. 6 is a schematic enlarged view of the distal end portion of the clamp member 17.
Referring to FIGS. 5 and 6, the clamp member 17 has, for example, a substantially rectangular shape in a side view. As shown in FIG. 6, a pressing member 23 having a clamp claw 22 is attached to the distal end portion of the clamp member 17. In a state where the end portion of the crankshaft Cs is held by the first holding portion 8, the pressing member 23 is pressed against the end portion of the crankshaft Cs. A portion of the clamp pawl 22 is bitten into the crankshaft Cs, thereby preventing the rotation of the crankshaft Cs.

FIG. 7 is a schematic plan view of the clamp member 17 and the configuration related thereto.
With reference to FIGS. 5 and 7, a link mechanism 24 is connected to one end of the clamp member 17 (the end on the side where the pressing member 23 is not attached). The clamp member 17 is held so as to be rotatable along a vertical plane with one end thereof as a fulcrum (specifically, with a rotation shaft 27 described later as a fulcrum). The clamp member 17 is rotated along a vertical plane between a clamp position (position indicated by a solid line in FIG. 5) and an unclamp position (position indicated by a two-dot chain line in FIG. 5).

  The link mechanism 24 includes a link arm 25 and an actuator A1. One end of the link arm 25 is fixed to a cylindrical member 26 (see FIG. 7). One end portion of the link arm 25 is connected to one end portion of the clamp member 17 through the cylindrical member 26. The cylindrical member 26 is inserted through one end of the clamp member 17 and one end of the link arm 25, and is rotatably held on the pedestal 28 via the rotation shaft 27. The clamp member 17, the link arm 25, and the cylindrical member 26 are held so as to be integrally rotatable along a vertical plane with the rotation shaft 27 as a fulcrum.

  On the other hand, as shown in FIG. 5, the actuator A1 is disposed behind the housing H2 (on the right side of the housing H2 in FIG. 5) so that one end thereof is on the upper side with respect to the other end. The lower end portion of the actuator A1 is connected to the housing H2 via the bracket 29, and the upper end portion of the actuator A1 is connected to the other end portion of the link arm 25. The actuator A1 is connected to the bracket 29 so as to be rotatable about its lower end. Further, the lower end portion of the actuator A1 and the other end portion of the link arm 25 are rotatable relative to each other. For example, a hydraulic cylinder or the like can be used as the actuator A1.

  The actuator A1 can integrally rotate the clamp member 17 and the link arm 25 with the rotation shaft 27 as a fulcrum. That is, when the actuator A1 extends in the longitudinal direction, the actuator A1 pushes up the other end of the link arm 25 while rotating around the lower end thereof. Thereby, the driving force of the actuator A1 is transmitted to the link arm 25, and the clamp member 17, the link arm 25, and the like rotate in one rotation direction (counterclockwise in FIG. 5) with the rotation shaft 27 as a fulcrum. By rotating the clamp member 17 in the one rotation direction, the pressing member 23 attached to the distal end portion of the clamp member 17 can be moved downward while drawing an arcuate locus. Thereby, the clamp member 17 can be moved to a clamp position.

  Further, when the actuator A1 is contracted in the longitudinal direction, the actuator A1 is rotated with its lower end portion as a fulcrum, and the other end portion of the link arm 25 is pulled down. Accordingly, the clamp member 17 and the link arm 25 and the like rotate in the other rotation direction (clockwise in FIG. 5), and the pressing member 23 moves upward while drawing an arcuate locus. The clamp member 17 can be moved to the unclamping position by contracting the actuator A1.

Next, the moving mechanism 18 will be described.
FIG. 8 is a schematic side view of the first holding unit 8 with a part cut away. In FIG. 8, the illustration of the clamp member 17 and the mechanism related thereto is omitted.
Referring to FIGS. 5 and 8, the moving mechanism 18 includes a pair of motors 30 (for example, servo motors). Each motor 30 is connected to a corresponding receiving member 16 via a ball screw mechanism 31. Each motor 30 can horizontally move the corresponding receiving member 16 in the arrangement direction X1. Thereby, the space | interval of a pair of receiving member 16 in the arrangement direction X1 and the position of each receiving member 16 in the arrangement direction X1 can be changed.

  As shown in FIG. 8, each ball screw mechanism 31 has a ball screw 32 and a nut 33. Each ball screw 32 is arranged such that its axial direction is parallel to the front-rear direction (left-right direction in FIG. 8) of the mass centering apparatus 3. Each ball screw 32 is rotatably held by the housing H2 via a plurality of bearings 34a and 34b. Each ball screw 32 is connected to a corresponding motor 30 via a joint (not shown).

  On the other hand, each nut 33 is externally fitted to the corresponding ball screw 32 via a plurality of balls (not shown). Each nut 33 is connected to a corresponding receiving member 16 via a stay 35. The receiving member 16, the nut 33, and the stay 35 are connected so as to be integrally movable in the axial direction of the ball screw 32. By rotating the ball screw 32 by the motor 30, the corresponding receiving member 16 and stay 35 can be moved together with the nut 33 in the axial direction of the ball screw 32. In FIG. 8, the outline of the portion that moves integrally with the left ball screw 32 is indicated by a bold line. When the left ball screw 32 is rotated by the motor 30, the portion surrounded by the thick line is horizontally moved integrally.

FIG. 9 is a schematic side view of a pair of receiving members 16 for explaining a method of adjusting the holding position of the crankshaft Cs by the first holding portion 8. 9A and 9B, the state before adjusting the holding position of the crankshaft Cs is indicated by a two-dot chain line, and the state after adjustment is indicated by a solid line.
The holding position of the crankshaft Cs by the first holding portion 8 can be adjusted by changing the distance between the pair of receiving members 16 in the arrangement direction X1 and / or the position of each receiving member 16 in the arrangement direction X1. That is, for example, as shown in FIG. 9A, the receiving members 16 are horizontally moved in the arrangement direction X1 to widen the interval W1 between the pair of receiving members 16 in the arrangement direction X1, whereby the pair of receiving members 16 The support position of the crankshaft Cs can be moved vertically downward. Although not shown, the support position of the crankshaft Cs by the pair of receiving members 16 can be moved vertically upward by narrowing the interval W1 between the pair of receiving members 16 in the arrangement direction X1. In this way, the holding position of the crankshaft Cs by the first holding part 8 can be moved in the vertical direction.

  For example, as shown in FIG. 9B, the position of each receiving member 16 in the arrangement direction X1 is changed to one side in the arrangement direction X1 (FIG. 9) without changing the interval W1 between the pair of receiving members 16 in the arrangement direction X1. By horizontally moving the right side in (b), the support position of the crankshaft Cs by the pair of receiving members 16 can be horizontally moved to one side in the arrangement direction X1. Similarly, by moving the position of each receiving member 16 in the arrangement direction X1 horizontally to the other side in the arrangement direction X1 without changing the interval W1 between the pair of receiving members 16 in the arrangement direction X1, the pair of receiving members 16 The support position of the crankshaft Cs can be horizontally moved to the other side in the arrangement direction X1. In this way, the holding position of the crankshaft Cs by the first holding part 8 can be horizontally moved in the arrangement direction X1. Therefore, by changing both the distance W1 between the pair of receiving members 16 in the arrangement direction X1 and the position of each receiving member 16 in the arrangement direction X1, the holding position of the crankshaft Cs by the first holding portion 8 is set to the vertical plane. It can also be moved diagonally upward or diagonally downward. Also in the second holding part 9, the holding position of the crankshaft Cs can be adjusted by the same method as described above.

  As described above, in the mass centering processing device 3 according to the present embodiment, the distance W1 between the pair of receiving members 16 in the arrangement direction X1 and / or the position of each receiving member 16 in the arrangement direction X1 is changed. The holding position of the crankshaft Cs by the second holding portions 8 and 9 can be adjusted by moving in the direction orthogonal to the axial direction of the crankshaft Cs. Thereby, the holding position of the crankshaft Cs can be adjusted based on the measurement result in the measurement station.

  Further, in the mass centering processing apparatus 3 according to the present embodiment, each receiving member 16 is moved using the motor 30 and the ball screw mechanism 31 (see FIG. 8), so that a moving mechanism including a conventional cam mechanism is used. As compared with the above, the positional accuracy of the receiving member 16 can be improved. Furthermore, the structure of the moving mechanism 18 is simpler and the number of parts is smaller than when a moving mechanism including a conventional cam mechanism is used. Therefore, the manufacturing cost of the mass centering apparatus 3 can be reduced.

  Furthermore, since the amount of movement of the receiving member 16 can be increased as compared with the case where a moving mechanism including a conventional cam mechanism is used, a plurality of types of cranks having greatly different dimensions (outer diameters) of held portions. The shaft Cs can be reliably held by the holding unit 6. That is, if the outer diameter of the held portion of the crankshaft Cs is large, the interval W1 between the pair of receiving members 16 may be increased, and if the outer diameter of the portion to be held is small, the pair of receiving members 16 is formed. What is necessary is just to make the space | interval W1 small. Thereby, it can respond to the multiple types of crankshaft Cs from which a dimension differs.

Next, the processing unit 7 will be described.
FIG. 10 is a schematic plan view of a part of the second processing unit 11.
Referring to FIGS. 3 and 10, each of the first and second processing units 10 and 11 has a tool 36 (for example, three tools 36). Each tool 36 is attached to the tip of the corresponding spindle 37 and rotates integrally with the spindle 37. Each spindle 37 is connected to a motor 39 via a pulley / belt mechanism 38 (see FIG. 3) and the like, and is rotated around its central axis by the motor 39.

  As shown in FIG. 10, the three tools 36 provided in the second machining unit 11 are arranged in parallel in the front-rear direction (vertical direction in FIG. 10) of the mass centering apparatus 3. Processing of the end portion of the crankshaft Cs is performed by a tool 36 disposed at a position (processing position) facing the end portion. For example, in the state shown in FIG. 10, the machining is performed by the tool 36 located in the middle. Although not shown, the three tools 36 provided in the first processing unit 10 are also arranged in parallel in the front-rear direction of the mass centering processing device 3, similarly to the second processing unit 11.

Also, as shown in FIG. 3, the three tools 36 provided in each of the processing parts 10 and 11 are horizontal along the left-right direction (left-right direction in FIG. 3) of the mass centering processing device 3 with respect to the corresponding housing H3. It is held movable. The three tools 36 provided in each of the processing units 10 and 11 are integrally moved horizontally by a servo unit 41 including a ball screw mechanism 40.
Each housing H3 is placed on the base B1 via an LM guide G3 extending in the front-rear direction of the mass centering apparatus 3 (a direction perpendicular to the paper surface in FIG. 3), and is horizontally moved in the front-rear direction by an actuator (not shown). Moved. By horizontally moving each housing H3 in the front-rear direction with respect to the base B1, the three tools 36 held by the housing H3 can be horizontally moved integrally in the front-rear direction. Thereby, the tool 36 located in the processing position can be changed.

FIG. 11 is an illustrative enlarged view of the tool 36 and the configuration associated therewith.
Each tool 36 has a holder 42 connected to a spindle 37. The holder 42 holds, for example, a drill 43 for making a center hole C1 at the end of the crankshaft Cs and a plurality of tips 44 (throw away tips). The plurality of chips 44 can perform at least one of peripheral turning (roughing), end face turning, and chamfering. Therefore, by using this tool 36, not only the center hole C1 is opened at the end of the crankshaft Cs, but also the outer periphery of the end is turned to adjust its outer diameter to a predetermined size, or the end It is possible to adjust the overall length of the crankshaft Cs by cutting the end face.

  The three tools 36 provided in each of the processing parts 10 and 11 can process the end of the crankshaft Cs to have different dimensions. For example, the outer diameter of the end of the crankshaft Cs has a different size. Can be processed. Therefore, the three tools 36 provided in each of the machining parts 10 and 11 are horizontally moved integrally in the front-rear direction, and the tool 36 at the machining position is exchanged to thereby change the end of the crankshaft Cs after machining. The outer diameter can be different. Therefore, the outer diameter of the end portion of the crankshaft Cs after processing can be changed without removing the tool 36 and replacing it (without so-called changeover). Thereby, the convenience of the mass centering apparatus 3 is enhanced.

  In the present embodiment, the case where each tool 36 is provided with a plurality of tips 44 has been described, but the plurality of tips 44 may be provided as necessary, and all the tips 44 are provided. It does not have to be. For example, when only the machining of the center hole C1 and the turning of the end face are required, the tip 44 other than the tip 44 for turning the end face may not be provided. When only the processing of the center hole C1 is required, all the tips 44 may be omitted and only the drill 43 may be held by the holder 42.

Next, the flow of processing by the mass centering processing device 3 will be described.
With reference to FIGS. 1 and 3, as described above, the crankshaft Cs that has been measured at the measurement station is carried into the processing station in a state in which the posture thereof is maintained substantially constant by the conveying means 4. . That is, the crankshaft Cs is placed on the pair of receiving members 16 of the holding portions 8 and 9. At this time, the positions of the holding portions 8 and 9 in the left-right direction of the mass centering machine 1 are adjusted in advance according to the total length of the crankshaft Cs. The distance between the pair of receiving members 16 in the arrangement direction X1 is adjusted in advance according to the outer diameter of the held portion of the crankshaft Cs.

  Further, before the crankshaft Cs is received by the receiving member 16 of each holding portion 8, 9, the receiving member 16 of each holding portion 8, 9 is moved in advance based on the measurement result at the measurement station. Thereby, the distance between the pair of receiving members 16 in the arrangement direction X1 and / or the position of each receiving member 16 in the arrangement direction X1 is changed, and the holding position of the end portion of the crankshaft Cs by the holding portions 8 and 9 is It is adjusted in advance based on the measurement result at the measurement station. That is, the moving mechanism 18 moves each receiving member 16 based on the measurement result at the measuring station before the crankshaft Cs is received by the pair of receiving members 16. By moving each receiving member 16 before the crankshaft Cs is received by the pair of receiving members 16, it is possible to move each receiving member 16 after the crankshaft Cs is received by the pair of receiving members 16. The processing time in the mass centering apparatus 3 is shortened. Thereby, the productivity of the mass centering apparatus 3 is enhanced.

  When the crankshaft Cs is placed on the receiving member 16 of each holding portion 8, 9, the crankshaft Cs is then positioned in the rotational direction and the axial direction by the rotational direction positioning mechanism 12 and the axial direction positioning mechanism 14. The Thereafter, the clamp members 17 of the holding portions 8 and 9 are pressed against the crankshaft Cs from above, and the end portions of the crankshaft Cs are held by the holding portions 8 and 9. As a result, the crankshaft Cs is held almost horizontally while being positioned in the rotational direction and the axial direction.

  When the crankshaft Cs is held by the holding unit 6, next, the two tools 36 arranged at the machining position are rotated. Further, the two tools 36 arranged at the machining position are respectively moved in the left-right direction of the mass centering processing device 3, and the two tools 36 are each pressed against the end of the crankshaft Cs. Thereby, the center hole C1 and other processing are performed at both ends of the crankshaft Cs. After the center hole C1 is formed at the end of the crankshaft Cs, the clamps by the clamp members 17 are released, and the processed crankshaft Cs is carried out of the processing station by the conveying means 4.

  In the processing of the center hole C1 and the like described above, the holding position of the end portion of the crankshaft Cs by the holding portions 8 and 9 is adjusted based on the measurement result at the measurement station. Accordingly, the center hole C1 is formed at a predetermined position at or near the center of inertia at the end of the crankshaft Cs. Although not shown, the measurement station is also provided with the same holding unit and positioning mechanism as the machining station, and the crankshaft Cs is held by the holding unit 6 in substantially the same posture as that in the measurement station. Therefore, by adjusting the holding position of the end portion of the crankshaft Cs by the holding portions 8 and 9 based on the measurement result at the measurement station, the inertial center at the end portion of the crankshaft Cs or a predetermined position near the center of inertia is obtained. The center hole C1 can be positioned reliably.

Further, when the rotating tool 36 is pressed against the end portion of the crankshaft Cs, rotational torque acts on the crankshaft Cs, and the crankshaft Cs has bitten the clamp claws 22 (see FIG. 6) at both ends thereof. The crankshaft Cs is prevented from rotating by the rotational torque because it is firmly held in the state.
As described above, in the present embodiment, the holding portions 8 and 9 change the holding positions by changing the distance between the pair of receiving members 16 in the arrangement direction X1 and / or the positions of the receiving members 16 in the arrangement direction X1. The holding position of the end portion of the crankshaft Cs by the portions 8 and 9 can be adjusted. Thereby, the center hole C1 can be opened at a predetermined position near the center of inertia at the end of the crankshaft Cs or in the vicinity thereof.

Further, by changing the distance between the pair of receiving members 16 in the arrangement direction X1 in each of the holding portions 8 and 9, a plurality of types of crankshafts Cs whose sizes (outer diameters) of the held portions are greatly different are securely held. can do. Thereby, it can respond to the multiple types of crankshaft Cs from which a dimension differs.
Although the embodiments of the present invention have been described above, the present invention is not limited to the contents of the above-described embodiments, and various modifications can be made within the scope of the claims. For example, in the above-described embodiment, the case where the shapes of the paired receiving members 16 are equal to each other has been described. However, the present invention is not limited to this, and the paired receiving members 16 may be formed in different shapes. . For example, as shown in FIG. 12, the inclination angles of the inclined portions 19 of the receiving members 16 that make a pair may be different from each other.

  As shown in FIG. 13, in the above-described embodiment, a lubricating device 45 that supplies a lubricant to the contact portion (inclined portion 19) of each receiving member 16 with the crankshaft Cs may be provided. A lubricating device 45 shown in FIG. 13 includes a main body portion 46 in which grease, which is an example of a lubricant, is held, and a nozzle 47 that supplies grease supplied from the main body portion 46 to the inclined portion 19. ing. The main body portion 46 is fixed to the receiving member 16, and the discharge port of the nozzle 47 is directed to the inclined portion 19. By supplying grease to the inclined portion 19 by the lubricating device 45, it is possible to suppress or prevent the inclined portion 19 from being worn by friction between the crankshaft Cs and the inclined portion 19. Therefore, for example, even when each receiving member 16 is horizontally moved in the arrangement direction X1 after the crankshaft Cs is placed on the pair of receiving members 16, wear of the inclined portion 19 can be suppressed or prevented. Furthermore, each receiving member 16 can be smoothly moved with respect to the crankshaft Cs.

In the above-described embodiment, the case where the mass centering processing device 3 constitutes a part of the mass centering machine 1 has been described. However, the present invention is not limited to this, and the mass centering processing device 3 may be other types such as the mass centering measuring device 2. It may be an independent device that is not combined with the device.
In addition, various design changes can be made within the scope of matters described in the claims.

It is a mimetic diagram showing a schematic structure of a mass centering machine provided with a mass centering processing device concerning one embodiment of the present invention. It is a front view of a crankshaft. It is an illustration front view showing a schematic structure of a mass centering processing device. FIG. 4 is a schematic external view of a mass centering apparatus as viewed along line IV-IV in FIG. 3. FIG. 5 is a schematic side view of the mass centering apparatus viewed along the line VV in FIG. 3. It is an illustration enlarged view of the tip part of a clamp member. It is an illustration top view of a clamp member and the composition relevant to it. It is an illustration side view of the 1st holding part which notched a part. It is an illustration side view of a pair of receiving member for explaining the adjustment method of the holding position of a crankshaft by the 1st holding part. It is an illustration top view of a part of the 2nd processing part. FIG. 2 is an illustrative enlarged view of a tool and related configurations. It is an illustration side view of a pair of receiving member concerning other embodiments of the present invention. It is an illustration side view of a pair of receiving member concerning other embodiments of the present invention.

Explanation of symbols

3 Mass Centering Processing Device 6 Holding Unit 7 Processing Unit 16 Receiving Member 17 Clamping Member 18 Moving Mechanism 19 Inclined Part (Contact Part)
20 Receiving part 45 Lubrication device Cs Crankshaft (workpiece)
C1 Center hole X1 (direction of receiving member) arrangement direction W1 Distance between a pair of receiving members

Claims (3)

A mass centering device that drills a center hole on the measured inertial spindle of a workpiece,
A holding unit that holds the workpiece almost horizontally;
A machining unit having a function of opening at least a center hole in the work held by the holding unit;
The holding unit is pressed from above on a pair of receiving members arranged adjacent to each other in the horizontal direction forming a V-shaped receiving portion for receiving the workpiece from below, and on the workpiece received by the pair of receiving members. A clamp member, and a moving mechanism for horizontally moving each receiving member individually in the arrangement direction of the receiving members,
The moving mechanism is capable of adjusting the distance between the pair of receiving members in the arrangement direction and the position of each receiving member in the arrangement direction by horizontally moving the receiving members individually. Mass centering processing equipment. The mass centering apparatus according to claim 1,
The mass centering apparatus according to claim 1, wherein the moving mechanism moves the receiving members based on a measurement result of the workpiece performed in a previous stage before the workpieces are received by the pair of receiving members. The mass centering apparatus according to claim 1 or 2,
The mass centering apparatus further comprising a lubrication device for supplying a lubricant to a contact portion of each receiving member with the workpiece.

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