JP2009119555A - Tool holder - Google Patents

Abstract

Provided is a tool holder that can be replaced quickly and easily while maintaining high runout accuracy and balance accuracy when exchanging tools.
In a tool holder 1 in which a head 3 is detachably mounted on a distal end side of an adapter 2 fixed to a machine tool 50, a flange portion that comes into close contact with the spindle end surface 52 of the machine tool 50 in the adapter 2. 5 and a center-of-gravity adjusting screw hole 6 into which a screw for adjusting the center of gravity formed in the flange part 5 is inserted. A flange portion 16 that is in close contact with the portion 5 is provided.
[Selection] Figure 1

Description

  The present invention relates to a tool holder for mounting and holding a tool such as a small-diameter rotating tool for cutting a die of an aspheric lens or the like, for example.

  In recent years, information devices and optical electronic devices have been required to have high performance and high functionality, while cost reduction has been required due to competition among peers. As minute precision parts used in these devices There are light guide plates and aspherical lenses. Such precision parts are molded using a mold formed by ultra-precision machining with a tool such as a small-diameter rotary tool, and further improvement in machining accuracy is desired as the mold becomes more complicated. (For example, refer nonpatent literature 1).

  In order to perform such ultra-precision machining, not only the precision of the tool but also the high performance of the tool holder that holds the tool is required. Especially when machining at high rotation, vibrations occur due to tool holder runout and unbalanced center of gravity, which not only affects the machining accuracy of the workpiece, but also may cause breakage of the tool. There was a thing.

  2. Description of the Related Art Conventionally, for example, a tool holder having a structure shown in Patent Document 1 is known as a tool holder capable of adjusting such deflection and center of gravity unbalance of the tool holder. This tool holder includes a tapered shank portion that fits into the opening of the spindle end surface of the machine tool, and a flange portion that is formed on the large-diameter side of the shank portion. A plurality of screw holes are formed at predetermined intervals, and a gravity center adjusting screw is inserted into the screw holes.

According to this tool holder, it is possible to adjust the runout by matching the axis of the tool holder and the main spindle of the machine tool by the two-surface constraint of the main spindle of the machine tool by the tapered shank portion and the flange portion. In addition, the tool holder that holds the tool is rotated at a high speed while being mounted on the spindle of the machine tool, and a balance test is performed using, for example, a balancing machine. The balance can be adjusted by inserting.
"Study on high-precision cutting of axisymmetric aspheric surfaces" Journal of Japan Society for Precision Engineering, Vol. 65, No. 3 (Japan Society for Precision Engineering: Issued on March 5, 1999) Japanese Utility Model Publication No. 3-87539

  By the way, in the conventional tool holder, if the tool is exchanged, the deflection and the center of gravity unbalance will occur again. Therefore, in order to achieve ultra-precise machining, run-out adjustment and balance adjustment are performed after installing a new tool. It was necessary to apply to the holder. Therefore, there is a problem that tool change while maintaining high runout accuracy and balance accuracy requires time and labor, and quick change work cannot be performed.

  The present invention has been made in view of such problems, and provides a tool holder that can be replaced quickly and easily while maintaining high runout accuracy and balance accuracy when performing tool replacement work. For the purpose.

In order to solve the above problems, the present invention proposes the following means.
That is, the tool holder according to the present invention is a tool holder in which a head to which a tool rotated around an axis is attached is detachably attached to a tip side of an adapter whose rear end side is fixed to a machine tool, The adapter is a shaft portion that is inserted into an attachment hole that opens to a main shaft end surface of the machine tool, and a taper hole that is open to the front end side of the shaft portion around the axis and decreases in diameter toward the rear end side, A flange portion extending radially outward of the axis and capable of being in close contact with the main shaft end surface; and a gravity center adjusting screw hole into which a screw for adjusting the center of gravity formed in the flange portion is inserted. The head is provided with a taper convex portion that fits into the taper hole on the rear end side thereof, and a collar portion that extends toward a radially outer side of the axis and comes into close contact with a surface facing the front end side of the flange portion Having It is characterized.

  When the shaft part is inserted into the spindle mounting hole of the machine tool, the adapter located on the rear end side contacts the rear end side of the flange part in close contact with the spindle end surface of the machine tool to match the axis. This makes it possible to perform shake adjustment. Furthermore, balance adjustment can be performed by appropriately inserting a gravity center adjusting screw into the gravity center adjusting screw hole of the flange portion of the adapter. On the other hand, the head is detachably attached to the adapter, and when this head is attached, the taper convex portion fits into the taper hole of the adapter and the surface facing the rear end side of the collar portion faces the tip end side of the flange portion. Since the two surfaces are in close contact with each other, the axis with the adapter can be matched with high accuracy.

  In such a tool holder, the tool is mounted on the tool holder in which the head and the adapter are integrated, and the swing adjustment and balance adjustment are performed in a state where the tool holder is attached to the main spindle of the machine tool. When changing the tool, the head is detached from the adapter while the tool is mounted on the head, and a new tool is attached to the head, and then the tool is attached to the adapter again. At this time, the head is constrained to the adapter in two planes so that the axis can be aligned with high accuracy, so that the head can be mounted in the same state without causing a deviation from the state before the head is removed. it can. Therefore, there is no occurrence of shake or unbalance of the center of gravity, so there is no need to perform the shake adjustment and balance adjustment operations again, and the attachment / detachment operation can be performed quickly and easily while maintaining high mounting accuracy. .

  In the tool holder according to the present invention, the mounting hole of the main shaft and the shaft portion of the adapter may be taper-fitted. As a result, the adapter is restrained in two planes with respect to the main axis of the machine tool, so that the axis line of the adapter and the main axis of the machine tool can be matched with high accuracy.

  The tool holder according to the present invention is characterized in that a posture correcting screw for pressing the spindle end surface toward the rear end side is provided on the flange portion.

  Since the posture correction screw presses the end face of the spindle of the machine tool, the adapter can be finely adjusted with respect to the spindle of the machine tool, so that the positioning accuracy can be further improved.

  Furthermore, in the tool holder according to the present invention, a collar portion is provided between the surface facing the rear end side of the flange portion and the spindle end surface, and is in close contact with the collar portion, and the collar portion is interposed through the collar portion. The posture correcting screw may press the end surface of the main shaft.

  Thereby, since the posture correction screw does not damage the spindle end surface of the machine tool, the smoothness of the spindle end surface can be maintained, and the adhesion between the flange portion and the spindle end surface of the machine tool can be maintained. .

  Further, in the tool holder according to the present invention, the tip portion of the head is a tool gripping portion in which a tool mounting hole into which the tool is inserted is drilled along an axis, and the tool gripping portion extends from the outer peripheral surface of the tool gripping portion. A runout adjustment screw that is inserted toward the inner peripheral surface of the tool mounting hole and adjusts the runout of the tool is provided.

  When the runout adjusting screw presses the tool from the outside in the radial direction of the tool holder, fine adjustment can be performed so that the axis of the tool matches the tool holder, and the positioning accuracy can be further improved.

  Moreover, in the tool holder which concerns on this invention, the said run-out adjustment screw is arrange | positioned at equal intervals in the circumferential direction on the plane orthogonal to the said axis line. When a plurality of shake adjusting screws arranged at equal intervals in the circumferential direction press the tool, the shake adjustment can be performed more flexibly and reliably.

  Furthermore, the tool holder according to the present invention is characterized in that the tool gripping part grips the tool by shrink fitting. Further, the tool gripping part may grip the tool with a collet chuck. As a result, the tool can be reliably gripped.

  With the tool holder according to the present invention, the tool can be replaced quickly and easily while maintaining high deflection accuracy and balance accuracy.

  Hereinafter, a first embodiment of the tool holder of the present invention will be described with reference to FIGS. 1 and 2. FIG. 1 is a side sectional view of the tool holder of the first embodiment, and FIG. 2 is a front view of the tool holder of the first embodiment. The tool holder 1 of the present embodiment includes an adapter 2 whose rear end is attached to the spindle 51 of the machine tool 50, and a head 3 that is formed separately from the adapter 2 and to which the cutting tool 60 is attached at the front end. 1 and 2, the tool holder 1 is configured by integrating the adapter 2 and the head 3 with their axes aligned.

  The adapter 2 has a shaft portion 4 that has a substantially cylindrical shape with an inside extending through the axis O, and the outer peripheral surface of the end portion on the tip side (right side in FIG. 1) of the shaft portion 4 is radially outward. And a flange portion 5 formed so as to extend circularly with the axis O as the center.

  The shaft portion 4 has a shaft portion outer peripheral surface 4 a extending in parallel with the axis O and can be inserted into the mounting hole 53. Note that the outer diameter of the outer peripheral surface 4 a of the shaft portion is formed slightly smaller than the inner diameter of the mounting hole 53 so that a clearance is provided between them when the shaft portion 4 is inserted into the mounting hole 53. Further, the inner peripheral surface of the shaft portion 4 has a tapered hole 4b whose diameter decreases with the axis O as the center from the opening on the front end side toward the rear end side (left side in FIG. 1), and the rear end of the tapered hole 4b. The inner peripheral surface is located on the side and is connected to the tapered hole 4b, and the inner peripheral surface is formed of a flat inner peripheral surface 4c formed in parallel with the axis O.

  In the flange portion 5, a surface 5 a facing the rear end side thereof is in contact with the spindle end surface 52 of the machine tool 50, and a surface 5 b facing the front end side is in contact with a surface 16 a facing the rear end side of the flange portion 16 of the head 3. The surface 5a facing the rear end side and the surface 5b facing the front end side of the flange portion 5 are both smooth and smooth in the direction perpendicular to the axis O. The flange portion 5 is configured such that the end surface 5a facing the rear end side can be brought into close contact with the main shaft end surface 52 of the machine tool 50 in a state where the shaft portion outer peripheral surface 4a of the shaft portion 4 is inserted into the mounting hole 53. ing.

  Further, in the vicinity of the edge portion of the flange portion 5, center-of-gravity adjustment screw holes 6 formed so as to penetrate from the surface 5 b facing the front end side toward the surface 5 a facing the rear end side are evenly arranged in the circumferential direction. For example, it is provided at a total of 12 places with an interval of 30 °. The center-of-gravity adjustment screw hole 6 can adjust the center of gravity by appropriately inserting a center-of-gravity adjustment screw (not shown) into a portion having a small weight based on the result of a balance test using, for example, a balancing machine. ing. The center-of-gravity adjusting screw hole 6 may be closed on the surface 5a side facing the rear end side of the flange portion 5 without being penetrated.

  Also, on these substantially same circumferences as the twelve center of gravity adjusting screw holes 6, posture correction formed so as to penetrate from the surface 5 b facing the front end side toward the surface 5 a facing the rear end side similarly to these. A total of three screw holes 7 are formed in the circumferential direction with an interval of 120 °, for example, and posture correction screws 8 are inserted into the posture correction screw holes 7 from the side of the surface 5b facing the tip side. The posture correction screw 8 can adjust the amount of protrusion in the direction of the axis O from the surface 5a facing the rear end side of the flange portion 5 with an adjustment tool such as a wrench.

  Further, as shown in FIG. 1, as shown in FIG. 1, through the center of gravity adjusting screw hole 6 and the posture correcting screw hole 7 of the flange portion 5, the surface penetrates from the surface 5 b facing the front end side to the surface 5 a facing the rear end side. The fixing bolt insertion holes 9 into which the fixing bolts 10 for fixing the adapter 2 to the main shaft 51 of the machine tool 50 are inserted are evenly spaced, for example, at 90 ° intervals in the circumferential direction. One is formed. Further, the inner diameter of the fixing bolt insertion hole 9 is slightly larger than the outer diameter of the fixing bolt 10 so that a clearance is provided between the fixing bolt 10 in a state where the fixing bolt 10 is inserted into the fixing bolt insertion hole 9. ing. Thereby, as will be described in detail later, it is possible to finely adjust the deflection between the tool body 1 and the spindle 51 of the machine tool 50.

  Further, a connection bolt 13 for fixing and connecting the adapter 2 and the head 3 is attached between the adjacent fixing bolt insertion holes 9 from the surface 5b facing the front end side toward the surface 5a facing the rear end side. A total of four bolt mounting holes 12 are formed. Further, a pressed surface 11 is provided around the opening of each connecting bolt mounting hole 12 on the surface 5b facing the front end side of the flange portion 5 so as to be recessed in a circular shape from the surface 5b.

  As shown in FIG. 1, the head 3 has a substantially multi-stage cylindrical shape with the inside penetrating about the axis O, and in the order from the rear end side to the front end side, the taper convex portion 15, the collar portion 16, the tool The grip 17 is used.

  The taper convex portion 15 is located at the rear end portion of the head 3 and has a taper outer peripheral surface 15a formed so as to reduce in diameter from the front end side toward the rear end side. The taper outer surface 15a is tapered. The angle is set to be substantially the same as the taper angle of the taper hole 4b of the adapter 2, and can be fitted into the taper hole 4b.

  The collar portion 16 is formed to extend in a circular shape centering on the axis O toward the radially outer side so as to have the largest diameter in the head 3, and the outer diameter thereof is the outer diameter of the flange portion 5. It is supposed to be smaller than the diameter. The flange portion 16 is configured such that a surface 16a facing the rear end side thereof is brought into contact with a surface 5b facing the front end side of the flange portion 5, and the surface 16a facing the rear end side is orthogonal to the axis O. It has a smooth surface. In the collar portion 16, the surface 16 a facing the rear end side faces the surface 5 b facing the front end side of the flange portion 5 in a state where the taper outer peripheral surface 15 a of the taper convex portion 15 is fitted in the taper hole 4 b of the adapter 2. It comes into close contact. A hollow portion 18 extending along the axis O is formed inside the collar portion 16 and the tapered convex portion 15.

  Further, on the surface 16a facing the rear end side of the flange portion 16, as shown in FIG. 1, the surface 5b facing the front end side of the flange portion 5 of the adapter 2 in a state where the head 3 and the adapter 2 are integrated. Four storage portions 19 for storing the heads 10 a of the fixing bolts 10 placed on the head are provided at intervals of 90 ° in the circumferential direction so as to correspond to the fixing bolts 10. In addition, a communication hole 20 is formed between the storage portion 19 and the surface 16b facing the distal end side of the flange portion 16 so as to communicate these.

  Further, on the substantially same circumference as the communication hole 20 of the flange portion 16, a counterbore portion 21 and a connecting bolt are inserted in order so as to penetrate from the surface 16b facing the front end side toward the surface 16a facing the rear end side. Holes 22 are provided, and the head 3 and the adapter 2 are firmly fixed and integrated by fixing the connecting bolts 13 inserted in these holes to the connecting bolt mounting holes 12 of the adapter 2.

  The inner diameter of the connecting bolt mounting hole 22 is formed one step larger than the outer diameter of the connecting bolt 13, and an internal thread is formed on the inner peripheral surface thereof. Accordingly, although the clearance between the connection bolt mounting hole 22 and the connection bolt 13 is provided, when a bolt member (not shown) having a diameter larger than that of the connection bolt 13 is inserted, the connection bolt mounting hole 22 is screwed together. It is configured.

  The tool gripping portion 17 is located at the tip portion of the head 3 and has a cylindrical shape whose outer periphery is the smallest diameter in the head 3, and the inside of the tool gripping portion 17 is drilled along the axis O. A hole 17a is formed. The tool mounting hole 17a is heated by a heater or the like so that its inner diameter is expanded by thermal expansion or the like, and the cutting tool 60 is fixed by being inserted and shrink-fitted in this state. Has been.

  The adapter 2 and the head 3 having such a configuration are integrated by attaching the head 3 to the adapter 2 as follows to constitute the tool holder 1. That is, first, the taper convex portion 15 located at the rear end portion of the head 3 is fitted into the taper hole 4 b opened to the tip end side of the adapter 2. At the same time, the surface 16a facing the rear end side of the flange portion 16 of the head 3 and the surface 5b facing the front end side of the flange portion 5 of the adapter 2 are brought into close contact with each other. Thus, the taper convex portion 15 and the flange portion 16 of the head 3 are restrained with respect to the adapter 2 by two surfaces, so that both are integrated and both axes are made to coincide with each other with high accuracy. The head 3 and the adapter 2 are firmly fixed and integrated by connecting the four connecting bolts 13 to form the tool holder 1.

  When the adapter 2 and the head 3 are integrated before being attached to the spindle 51 of the machine tool 50 in this way, the fixing bolt 10 is inserted into the bolt insertion hole 9 of the adapter 2 in advance, and the head 2 It is necessary to store the head 10 a of the fixing bolt in the storage portion 19 of the head 3 in a state where the adapter 3 and the adapter 3 are integrated.

  In order to attach the tool holder 1 to the main shaft 51 of the machine tool 50, first, the shaft portion 4 positioned at the rear end portion of the adapter 2 is inserted into the attachment hole 53 of the machine tool 50. At the same time, the surface 5 a facing the rear end side of the flange portion 5 is brought into close contact with the spindle end surface 52 of the machine tool 50. As a result, the tool holder 1 is constrained on one surface with respect to the main shaft 51 of the machine tool 50. Then, the tool holder 1 is fixed to the spindle 51 of the machine tool 50 by screwing the fixing bolt 10 through the communication hole 20 using a tool such as a wrench.

  At this time, a slight clearance is formed between the fixing bolt 10 and the fixing bolt insertion hole 9, and the shaft portion outer peripheral surface 4 a of the shaft portion 4 of the adapter 2 and the mounting hole 53 of the machine tool 50 are formed. Since a slight clearance is formed between them, it is possible to finely adjust the deflection between the tool holder 1 and the spindle 51 of the machine tool 50 by the operation of attaching the fixing bolt 10 to the spindle 51 of the machine tool 50. .

  In the present embodiment, balance adjustment and runout adjustment are performed in a state where the tool holder 1 holding the cutting tool 60 is attached to the main shaft 51 of the machine tool 50 in this manner. For balance adjustment, the tool holder 1 and the cutting tool 60 are rotated at a high speed together with the spindle 51 of the machine tool 50, for example, a balance test is performed by a balancing machine or the like. The center of gravity unbalance is eliminated by inserting the center of gravity adjusting screw into the hole 6.

  Further, the deflection of the tool holder 1 is adjusted by adjusting the amount of protrusion in the direction of the axis O from the surface 5a facing the rear end side of the flange portion 5 by turning the posture correction screw 8 using a tool such as a wrench. Thus, the spindle end surface 52 of the machine tool 50 is pressed, and the attitude of the tool holder 1 with respect to the spindle 51 of the machine tool 50 is finely adjusted.

  By performing such balance adjustment and runout adjustment, it is possible to perform ultra-precise cutting with higher accuracy. When exchanging the cutting tool, first, the cutting tool 60 is detached from the adapter 2 together with the head 3 in a state where the cutting tool 60 is mounted on the head 3 of the tool holder 1. At this time, since the head 3 and the adapter 2 are fixed and integrated by taper fitting, the two cannot be easily separated only by removing the connecting bolt 13. Therefore, in this case, a bolt member (not shown) having a diameter that can be screwed into the bolt insertion hole 22 is screwed, and the tip of the bolt member presses the pressed surface 11 of the adapter 2. The head 3 can be separated from the adapter 2.

  Then, after separating the head 3, a new cutting tool 60 is changed to the head 3, and then the head 3 is attached to the adapter 2. At this time, the head 3 is constrained to the adapter 2 so that the axis can be aligned with high accuracy, so that the head 3 is mounted in the same state without causing a deviation from the state before the head 3 is removed. Can be made. Therefore, there is no occurrence of unbalance and shake of the center of gravity, so that it is not necessary to perform the balance adjustment and shake adjustment again, and the attachment / detachment operation can be performed quickly and easily while maintaining high attachment accuracy.

  Next, the tool holder 30 of 2nd embodiment of this invention is demonstrated using FIG.3 and FIG.4. FIG. 3 is a side sectional view of the tool holder of the second embodiment, and FIG. 4 is a front view of the tool holder of the second embodiment. 3 and 4, the same components as those in FIGS. 1 and 3 are denoted by the same reference numerals, and detailed description thereof is omitted. The tool holder 30 of the second embodiment is different from the first embodiment in that the tool gripping portion 17 is provided with a deflection adjusting screw 31, and the other configuration is the same.

  As shown in FIGS. 3 and 4, the tool gripping portion 17 has a runout adjustment that is orthogonal to the axis O and extends along the radial direction and communicates from the outer peripheral surface 17b of the tool gripping portion 17 to the tool mounting hole 17a. A plurality of screw holes 32 are formed. In the present embodiment, as shown in FIG. 4, three shake adjustment screw holes are arranged at 120 ° intervals in the circumferential direction. As an adjusting means for adjusting the deflection of the cutting tool 60, a deflection adjusting screw 31 having a tip surface as a pressing surface 31 a that presses the outer peripheral side surface of the cutting tool 60 is screwed into the deflection adjusting screw hole 32.

  According to such a tool holder 30, the pressing surface 31 a of the runout adjustment screw 31 presses the cutting tool 60 from the outside in the radial direction of the tool holder 30, thereby finely adjusting the axis of the cutting tool 60 to the tool holder 30. It becomes possible to perform cutting with higher accuracy. Further, the three runout adjustment screws 31 arranged at equal intervals in the circumferential direction press the cutting tool 60, so that the runout adjustment can be performed more flexibly and surely. The tool 60 functions as a three-jaw chuck that clamps and fixes the tool 60 from three directions, and the cutting tool 60 can be more reliably fixed.

  Next, the tool holder 40 of 3rd embodiment of this invention is demonstrated using FIG. FIG. 5 is a side sectional view of the tool holder of the second embodiment. 5, the same components as those in FIGS. 1 and 3 are denoted by the same reference numerals, and detailed description thereof is omitted. The tool holder 40 of this embodiment is different from that of the second embodiment in that a collar portion 41 is provided on the rear end side of the flange portion 5 of the adapter 2, and the other configuration is the same.

  The collar portion 41 has a donut disk shape opened about the axis O. The outer diameter of the collar portion 41 is substantially the same as the outer diameter of the flange portion 5, and the surface 5 a facing the rear end side of the flange portion 5. The shaft portion 4 of the adapter 2 is inserted through the central opening. As shown in FIG. 5, when the tool holder 40 is mounted on the spindle 51 of the machine tool 50, the tool holder 40 is interposed between the surface 5 a facing the rear end side of the flange portion 5 and the spindle end face 52 of the machine tool 50. The main shaft end surface 52 is also in close contact with the main shaft end surface 52.

  Thereby, when the posture correction screw 8 presses the spindle end surface 52 of the machine tool 50, the posture correction screw 8 can be prevented from coming into direct contact with the spindle end surface. 52 can be prevented from being damaged. Therefore, since the smoothness of the spindle end surface 52 can be maintained, a highly accurate two-surface constraint can be maintained.

  As mentioned above, although the tool holder 1, 30, 40 which is embodiment of this invention was demonstrated, this invention is not limited to this, It can change suitably in the range which does not deviate from the technical idea of the invention. For example, in the present embodiment, the configuration in which the cutting tool 60 is attached to the tool gripping portion 17 by shrink fitting is not limited to this. For example, in the first embodiment, the tool is gripped by a collet chuck. By doing so, the cutting tool 60 may be mounted. This also makes it possible to hold the cutting tool 60 firmly. In the second and third embodiments in which the runout adjustment screw 31 and the runout adjustment screw hole 32 are provided, it is impossible to structurally provide a collet chuck. 60 is mounted.

  In the present embodiment, the gravity center adjusting screw hole 6 is provided in the flange portion 5 of the adapter 2, but may be provided in the flange portion 16 of the head 3. This makes it possible to adjust the center of gravity more flexibly.

  In the second and third embodiments, the tool holders 30 and 40 are composed of the adapter 2 and the head 3 as in the first embodiment. However, the adapter 2 and the head 3 are from the beginning. The thing of the structure shape | molded integrally may be sufficient.

  In the first, second, and third embodiments, a clearance is provided between the shaft portion 4 of the adapter 2 and the mounting hole 53 of the machine tool 50. The diameter may be formed to be approximately the same as the inner diameter of the mounting hole 53, and the two may be in close contact with each other.

  Further, as shown in FIG. 6, as a modification, a tapered outer peripheral surface 4 a formed so that the outer peripheral surface of the shaft portion 4 of the adapter 2 is reduced in diameter about the axis O as it goes from the front end side to the rear end side. The taper outer peripheral surface 4a may be taper-fitted to the attachment hole 54 formed in a taper shape. As a result, the adapter 2 is constrained by two surfaces with respect to the main shaft 51 of the machine tool 50, so that the axes can be easily aligned and attached.

  In addition, in embodiment, although the case where the cutting tool 60 was attached to the tool holder 1, 30, 40 was demonstrated, it is not limited to this cutting tool 60, For example, other tools, such as a grinding tool and a polishing tool It may be. That is, the tool holder of the present invention is for widely attaching a tool with high accuracy, and any tool can be an object to be attached.

It is a sectional side view of the tool holder of a first embodiment. It is a front view of the tool holder of a first embodiment. It is a sectional side view of the tool holder of a second embodiment. It is a front view of the tool holder of a second embodiment. It is a sectional side view of the tool holder of a third embodiment. It is a sectional side view of the tool holder of a modification.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Tool holder 2 Adapter 3 Head 4 Shaft part 4b Taper hole 5 Flange part 6 Gravity center adjustment screw hole 7 Posture correction screw hole 8 Posture correction screw 15 Taper convex part 16 Collar part 17 Tool holding part 17a Tool mounting hole 30 Tool holder 31 Swing Adjustment screw 40 Tool holder 41 Collar portion 50 Machine tool 51 Spindle 52 Spindle end face 53 Mounting hole 60 Cutting tool O Axis line

Claims (8)

A tool holder in which a head to which a tool rotated around an axis is attached detachably is attached to a tip side of an adapter whose rear end side is fixed to a machine tool,
The adapter is
A shaft portion that is inserted into a mounting hole that opens in a spindle end surface of the machine tool;
A taper hole that is open on the front end side of the shaft portion with the axis as a center and is reduced in diameter toward the rear end side;
A flange portion extending toward a radially outer side of the axis and capable of being in close contact with the end surface of the main shaft;
A center of gravity adjusting screw hole into which a screw for adjusting the center of gravity formed in the flange portion is inserted;
The head is provided with a tapered convex portion that fits into the tapered hole on the rear end side thereof, and a collar portion that extends toward a radially outer side of the axial line and comes into close contact with a surface facing the front end side of the flange portion. A tool holder comprising:   The tool holder according to claim 1, wherein the mounting hole of the main shaft and the shaft portion of the adapter are taper-fitted.   The tool holder according to claim 1 or 2, wherein a posture correcting screw for pressing the spindle end surface toward the rear end side is provided on the flange portion. A collar portion is provided between the surface facing the rear end side of the flange portion and the end surface of the main shaft so as to be in close contact with them,
The tool holder according to claim 3, wherein the posture correction screw presses the end surface of the main shaft through the collar portion. The tip of the head is a tool gripping part in which a tool mounting hole into which the tool is inserted is drilled along the axis.
5. A runout adjustment screw that is inserted from an outer peripheral surface of the tool gripping portion toward an inner peripheral surface of the tool mounting hole and adjusts the runout of the tool is provided. Tool holder according to item.   The tool holder according to claim 5, wherein the runout adjustment screws are arranged at equal intervals in a circumferential direction on a plane orthogonal to the axis.   The tool holder according to any one of claims 1 to 6, wherein the tool gripping part grips the tool by shrink fitting.   The tool holder according to any one of claims 1 to 4, wherein the tool gripping part grips the tool by a collet chuck.

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