JP2017013212A - Tool holder - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an improved tool holder (a tool holder) that can preset and chuck a wide variety of tools.SOLUTION: A tool holder (10) comprises a holder main body (11) and an adaptor (21) which are detachably connected. The adaptor has: a chuck part (24) that chucks a shank part (101); an engagement part (22) that matches a shaft line of the adaptor with a shaft line of the holder main body; and a rear end side penetration hole (25) that penetrates through the engagement part and extends, and connects to a hole bottom of a tool holding hole (242). The holder main body has: a center hole (15) extending from a part to be engaged toward a rear end; an adjustment member (31) that is stored in the center hole and can advance toward and retreat from the adaptor; and an adjustment screw (41) that regulates positions for the adjustment member to advance and retreat, by contacting slidably an inclination surface (313), a tip of which is provided at a side of the adjustment member.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a tool holder for chucking a tool, and more particularly to a structure for presetting a protruding length of a tool.

  In the tool holder (tool holder) for chucking a tool (tool) such as a blade, in order to cut the workpiece accurately, it is necessary to preset the protruding length of the tool protruding from the tool holder to a predetermined value. is there. As a technique related to the presetting of the tool protrusion length, for example, a tool holder described in Japanese Utility Model Laid-Open No. 23-23910 (Patent Document 1) is conventionally known. The tool holder described in Patent Document 1 has a mechanism for adjusting the protruding length of the tool inside the tool holder. To measure the protruding length, attach the rear end of the tool holder to the tool preset gauge mounting part, hold the tool holder upright, insert the tool into the tip of the tool holder, This is done by applying a tool preset gauge gauge to the. To adjust the protruding length, engage the adjustment tool such as a hexagon wrench with the gear member provided on the outer peripheral surface of the tool holder while the rear end of the tool holder is attached to the tool preset gauge. And rotate it.

Japanese Utility Model Publication No. 2-33910

  However, since the tool holder of Patent Document 1 is a single body and uses a taper collet to chuck the tool to the main body of the tool holder, the chucking mechanism and the length and thickness of the tool are the main body. It will be limited to the specifications. In other words, the tool holder of Patent Document 1 cannot chuck a wide variety of tools.

  An object of the present invention is to provide an improved tool holder (tool holder) capable of presetting and chucking a wide variety of tools (tools) in view of the above circumstances.

  For this purpose, the tool holder according to the present invention comprises a holder main body having a mounting portion for mounting on the spindle of the machine tool in the rear end region, and an adapter removably fixed to the front end of the holder main body. The adapter is a tool holding hole that extends from the tip center of the adapter toward the rear end side and into which the shank portion of the tool is inserted, a chuck portion that is provided in the tip region of the adapter and chucks the shank portion that is inserted into the tool holding hole, An engaging portion that is provided at the center of the rear end of the adapter and fits with an engaged portion provided at the center of the tip of the holder main body so as to match the axis of the adapter with the axis of the holder main body. A rear end side through hole extending and connected to the bottom of the tool holding hole. The holder body includes a center hole extending from the engaged portion toward the rear end side, an adjustment member accommodated in the center hole and capable of moving forward and backward toward the adapter, and extending from the adjustment member toward the front end of the engaged portion and the adapter. A pin portion that penetrates the rear end side through-hole and contacts the shank portion, a first radial hole that extends from the outer peripheral surface of the holder body in the inner diameter direction and connects to the center hole, and a first radial hole are screwed together. The screw has an adjustment screw that defines the advance / retreat position of the adjustment member by slidably coming into contact with an inclined surface provided on the side of the adjustment member. And an adjustment member prescribes | regulates the protrusion length of the tool which is inserted in a tool holding hole and protrudes from an adapter via the pin part contact | abutted with a shank part.

  According to the present invention, by preparing a plurality of types of adapters, it is possible to preset tools of various specifications having different outer diameters or different overall lengths with a common holder body. In other words, a presettable tool holder can be used for general purposes.

  As one embodiment of the present invention, the holder body further has a flat front end surface perpendicular to the axis, and the adapter further has a flat rear end surface perpendicular to the axis, and the front end surface and the rear end surface are in close contact with each other. Then, fix the adapter to the holder body. According to this embodiment, when the adapter is connected to the holder body, the shake of the adapter rear end surface becomes substantially zero, and the axis of the adapter can be held straight along the axis of the holder body.

  As a preferred embodiment of the present invention, the engaged portion of the holder body and the engaging portion of the adapter are a combination of a tapered taper protrusion and a round hole that receives the taper protrusion, and the inner diameter of the round hole is a taper protrusion. It is slightly smaller than the outer diameter of the root side. According to this embodiment, the taper protrusion is pushed into a round hole having an inner diameter slightly smaller than the outer diameter of the taper protrusion, and the outer periphery of the taper protrusion is in close contact with the inner periphery of the round hole without any gap. The protrusion is correctly positioned at the center of the round hole.

  As a further preferred embodiment of the present invention, the inclined surface is formed so as to become shallower toward the distal end side of the holder body, and the distal end of the adjusting screw comes into contact with the inclined surface. According to this embodiment, when presetting the tool, if the tool holder is raised upward and the adjusting screw is tightened and rotated, the tool can be advanced to continuously adjust the protruding length of the tool. Such a simple configuration improves the preset work efficiency.

  As one embodiment of the present invention, a groove extending in parallel with the axis of the holder body is provided on the side of the adjustment member, and the holder body extends in the inner diameter direction from the outer peripheral surface of the holder body and is connected to the center hole. A screw that is screwed into the second radial hole and the second radial hole, and has a non-rotating screw that prevents the adjustment member from rotating when the tip engages with the groove. According to this embodiment, it can prevent that an adjustment member idles in a center hole.

  As one embodiment of the present invention, the center hole of the holder main body constitutes a passage for supplying cutting fluid to the rear end side through hole of the adapter. According to this embodiment, the cutting fluid can be efficiently supplied to the tip region of the tool.

  The method in which the chuck portion chucks the shank portion of the tool is not particularly limited. As one embodiment of the present invention, the chuck portion of the adapter is a shrink fit chuck system. According to this embodiment, the tool shank part can be firmly chucked by heat shrinkage of the metal after the presetting of the tool is completed.

  Alternatively, as another embodiment of the present invention, the chuck portion of the adapter is a taper collet chuck system. According to this embodiment, the shank part of the tool can be firmly chucked by the wedge action of the taper collet after the presetting of the tool is completed.

  Alternatively, as still another embodiment of the present invention, the chuck portion of the adapter is a hydro chuck type. According to this embodiment, the tool shank can be firmly chucked by hydraulic pressure after the presetting of the tool is completed. Further, by preparing the above-described various chuck type adapters for a common holder main body, a variety of chucking can be obtained.

  As described above, according to the present invention, it is possible to chuck a wide variety of tools by exchanging adapters, and it is possible to easily perform presetting of tools (tools).

It is a longitudinal cross-sectional view which shows the tool holder which becomes 1st Embodiment of this invention. It is a longitudinal cross-sectional view which shows the state which isolate | separated the adapter and holder main body of the embodiment. It is a longitudinal cross-sectional view which shows the state which advanced the adjustment member of the embodiment to the front end side. It is a longitudinal cross-sectional view which shows the adapter which becomes 2nd Embodiment. It is a longitudinal cross-sectional view which shows typically the adapter which becomes 3rd Embodiment.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. FIG. 1 is a longitudinal sectional view showing a tool holder according to a first embodiment of the present invention. The tool holder 10 includes a holder main body 11 and an adapter 21 as main components. The holder body 11 and the adapter 21 are connected as shown in FIG. Further, as shown in FIG.

  The metal holder main body 11 extends along an axis O indicated by a one-dot chain line, and includes a front end surface 12, a mounting portion 13, and a flange portion 14. The tip surface 12 is a flat surface perpendicular to the axis O provided at the tip of the holder body 11. The mounting portion 13 is provided in the rear end region of the holder body 11 in the direction of the axis O, and is mounted on the spindle of the machine tool. The flange portion 14 is provided in the tip end region of the holder main body 11 in the axis O direction, and projects from the tip end surface 12 and the mounting portion 13 in the outer diameter direction. A V-shaped groove 142 extending in the circumferential direction is formed on the outer peripheral edge of the flange portion 14.

  The mounting portion 13 has a shape that fits into a main shaft of a machine tool (not shown), and the outer peripheral surface of the mounting portion 13 of this embodiment is formed in a taper that decreases in radius toward the rear end in the axial direction. The mounting portion 13 is formed with a pull stud attachment hole 132 extending along the axis O that becomes the center of the holder body 11. An internal thread 132t is formed on the inner periphery of the pull stud attachment hole 132, and the internal thread 132t extends from the rear end of the holder body 11 in the axis O direction toward the front end side in the axis O direction. The bottom of the pull stud mounting hole 132 is connected to the center hole 15. The center hole 15 extends along the axis O and is connected to an engaged portion 16 described later on the tip side in the axis O direction.

  A pull stud (not shown) is screwed into the female thread 132t of the mounting portion 13, and the pull stud is pulled backward, so that the mounting portion 13 is securely mounted to the center through coolant main shaft of the machine tool. Then, the cutting fluid or the cleaning fluid flows into the pull stud mounting hole 132 from the center through coolant main shaft. Therefore, the pull stud mounting hole 132 and the center hole 15 become a liquid passage.

  The center hole 15 accommodates the adjustment member 31. The adjustment member 31 is an elongated cylindrical member extending in the direction of the axis O, and can move forward and backward in the direction of the axis O within the center hole 15. A pin portion 312 extends from the tip of the adjustment member 31. The distal end portion of the pin portion 312 extends through the engaged portion 16 that is a recess, protrudes beyond the distal end surface 12 in the distal end direction, and is inserted into the engaging portion 22 described later. Note that the cross-sectional shape of the pin portion 312 is smaller than the cross-sectional shape of the adjustment member 31.

  An inclined surface 313 and a groove 314 are formed on the side of the adjustment member 31. The inclined surface 313 extends in the direction of the axis O, but is not parallel to the axis O and is a flat surface inclined with respect to the axis O. The inclined surface 313 is formed so as to be shallower toward the distal end side of the tool holder 10 and deeper toward the distal end side of the tool holder 10. The groove 314 extends in the direction of the axis O.

  The holder body 11 is further provided with a first radial hole 17 and a second radial hole 18. These radial holes 17 and 18 extend in the inner diameter direction from the outer peripheral surface of the holder body 11 and are connected to the center hole 15. Female threads are formed on the inner peripheral surfaces of the radial holes 17 and 18, and the screws are screwed together.

  The adjustment screw 41 screwed into the first radial hole 17 has a polygonal engagement hole 412 at the end closer to the outer peripheral surface of the holder body 11. The adjustment screw 41 is displaced along the radial hole 17 by inserting and rotating an adjustment tool such as a wrench into the engagement hole 412. Then, the tip 413 of the adjustment screw 41 enters or leaves the center hole 15. The tip 413 is rounded in a convex shape, and slidably contacts the aforementioned inclined surface 313.

  The detent screw 42 screwed into the second radial hole 18 has a head portion 422 disposed on the outer peripheral surface of the holder body 11 and a tip portion 423 disposed in the center hole 15. The head 422 is formed with an engagement hole 424 for engaging with an adjustment tool such as a driver. The distal end portion 423 engages with the groove 314 of the adjustment member 31 to prevent the adjustment member 31 from rotating about the axis O. Since the outer diameter of the head 422 is larger than the inner diameter of the radial hole 18, even if an adjustment tool is inserted into the engagement hole 424 and rotated in the tightening direction, the tip 423 of the rotation screw 42 enters the inner diameter direction. Thus, the adjusting member 31 is not pressed.

  The engaged portion 16 is a bottomed round hole disposed coaxially with the axis O of the holder body 11 and receives an engaging portion 22 described later. The front end surface 12 is an annular flat surface centered on the axis O of the holder body 11 and is in close contact with a rear end surface 232 described later. The inner diameter of the round hole constituting the engaged portion 16 is slightly smaller than the outer diameter on the base side of the taper protrusion 222 formed on the outer periphery of the engagement portion 22, and the outer diameter of the protrusion end of the taper protrusion 222. Bigger than.

  The adapter 21 has an engagement portion 22 provided at the center of the rear end, a flange portion 23 provided on the rear end side, and a chuck portion 24 provided in the front end region. The engaging portion 22 includes a tapered tapered protrusion 222 protruding from the rear end face 232 of the flange portion 23 and a constricted portion 223 having an outer shape smaller than the outer diameter of the taper protruding portion 222 on the root side. The constricted portion 223 has a cylindrical shape, and connects the tapered protruding portion 22 and the rear end surface 232. As described above, the outer diameter of the engaging portion 22 is large on the base side (side closer to the rear end surface 232) of the taper protruding portion 222, and gradually decreases as the distance from the rear end surface 232 increases. Further, the outer diameter on the base side of the taper protrusion 222 is slightly larger (0.005 mm to 0.015 mm) than the inner diameter on the opening side of the engaged portion 16 which is a round hole.

  The adapter 21 and the holder main body 11 are connected by fitting the engaging portion 22 of the adapter 21 so as to be inserted into the engaged portion 16 of the holder main body 11, and the rear end surface 232 of the adapter 21 to the front end surface 12 of the holder main body 11. This is done by surface contact. The engaging portion 22 is pushed into the engaged portion 16 having an inner diameter slightly smaller than the outer diameter of the engaging portion 22 so that the outer periphery of the engaging portion 22 is in close contact with the inner periphery of the engaged portion 16 without a gap. Thus, the engaging portion 22 is correctly positioned on the axis O that becomes the center of the holder main body 11. Further, when the rear end surface 232 is in close contact with the front end surface 12, the deflection of the rear end surface 232 becomes substantially zero, and the center axis of the adapter 21 coincides with the axis O of the holder body 11. In the following description, the central axis of the adapter 21 is simply referred to as the axis O. A plurality of through holes 233 extending in parallel with the axis O are provided in the flange portion 23 centered on the axis O at intervals in the circumferential direction. Bolts 43 are passed through the respective through holes 233. The neck lower portion of each bolt 43 is passed through the through hole 233 and screwed into a plurality of female screw holes 122 provided in the distal end surface 12 at intervals in the circumferential direction. The head of each bolt 43 is larger than the inner diameter of the through-hole 233 and is locked to the flange portion 23 so that the connection between the adapter 21 and the holder main body 11 is strong.

  The chuck portion 24 is a shrink-fitting chuck type, but has a thick cylindrical shape made of metal with an opening in the axial direction, and has a tool holding hole 242 in the center. The shank portion 101 of the tool 100 is inserted into the tool holding hole 242. The inner peripheral surface of the tool holding hole 242 has an effective grasping length of a predetermined dimension, and its inner diameter is slightly smaller than the outer diameter of the shank portion 101 inserted into the tool holding hole 242. For example, when the outer diameter of the shank portion 101 is 20.00 mm, the inner tool holding hole 242 has an inner diameter of 20.00-0.03 mm or more and 20.00-0.025 mm in a cooled state where the shank portion 101 is not inserted. It is as follows. However, when the chuck portion 24 is sufficiently heated, the inner diameter of the tool holding hole 242 becomes slightly larger than the outer diameter of the shank portion 101.

  That is, the chuck part 24 chucks the shank part 101 by a shrink fit chuck method. The shank portion 101 is centered so as to coincide with the axis of the adapter 21 by chucking the chuck portion 24.

  A hole bottom 243 of the tool holding hole 242 extending from the front end of the adapter 21 to the rear end side along the axis O is connected to the rear end side through hole 25. The inner diameter of the rear end side through hole 25 is smaller than that of the tool holding hole 242. The rear end side through hole 25 is formed at the rear end portion of the adapter 21, extends along the axis O, and penetrates the engagement portion 22. The rear end side through hole 25 receives the pin portion 312 described above. In the present embodiment, the inner diameter of the rear end side through hole 25 is reduced on the front end side 252 and increased on the rear end side 253. The hole length on the rear end side 253 is equal to the protruding length of the engaging portion 22 protruding from the rear end surface 232. That is, the engaging portion 22 is formed in a cylindrical shape.

  Next, presets according to the first embodiment will be described.

  As shown in FIG. 1, the tool holder 10 which connected the adapter 21 to the holder main body 11 is prepared, and the front-end | tip of the tool holder 10 is made into an upward attitude | position. Next, the chuck portion 24 is thermally expanded to expand the diameter of the tool holding hole 242, and the shank portion 101 is inserted. When the pin portion 312 is retracted from the tool holding hole 242, the rear end surface 102 of the shank portion 101 contacts the hole bottom 243 of the tool holding hole 242.

  Next, the adjustment screw 41 is tightened and rotated, and the tip 413 of the adjustment screw 41 is displaced in the inner diameter direction of the holder body 11. Then, the tip 413 slides along the inclined surface 313, and the amount of entry of the tip 413 is converted into the amount of advance of the adjustment member 31. Thus, the adjustment member 31 advances toward the tip of the tool holder 10 in accordance with the amount of entry of the tip 413. Further, the tip 315 of the pin portion 312 enters the tool holding hole 242 from the rear end side through hole 25 and comes into contact with the rear end face 102 of the shank portion 101 so that the tool 100 protrudes toward the tip side.

  FIG. 1 shows a state in which the adjustment member 31 is most retracted. At this time, the tip 413 of the adjustment screw 41 comes into contact with the most tip side of the inclined surface 313. The tip side of the inclined surface 313 is shallow when viewed from the inner peripheral surface of the center hole 15. On the other hand, FIG. 3 shows a state in which the adjustment member 31 is most advanced. At this time, the tip 413 of the adjustment screw 41 comes into contact with the most rear end side of the inclined surface 313. The rear end side of the inclined surface 313 is deep from the inner peripheral surface of the center hole 15. In order to reduce the protruding amount of the tool 100, the adjustment screw 41 is loosened and rotated to displace the tip 413 to the outer diameter side.

  When the tool 100 is preset to a desired protrusion amount, the chuck portion 24 is thermally contracted to reduce the diameter of the tool holding hole 242 and chuck the shank portion 101. As a result, the tool 100 is chucked to the tool holder 10 with a desired protrusion amount.

  By the way, according to 1st Embodiment mentioned above, the adapter 21 which is detachably fixed to the front-end | tip of the holder main body 11 extends toward the rear-end side from the front-end | tip center of the adapter 21, and the tool in which the shank part 101 of the tool 100 is inserted. A holding hole 242, a chuck portion 24 that is provided in the tip end region of the adapter 21 and chucks the shank portion 101 inserted into the tool holding hole 242, and is provided in the center of the rear end of the adapter 21 and in the center of the tip of the holder main body 11. An engagement portion 22 that makes the axis line of the adapter 21 coincide with the axis line O of the holder body 11 by fitting with the provided engaged portion 16, and a hole bottom of the tool holding hole 242 that extends through the engagement portion 22. And a rear end side through hole 25 to be connected. The holder body 11 includes a center hole 15 extending from the engaged portion 16 toward the rear end, an adjustment member 31 that is accommodated in the center hole 15 and can be moved forward and backward toward the adapter 21, and extends from the adjustment member 31 toward the tip. The pin portion 312 that extends through the engaged portion 16 and the rear end side through-hole 25 of the adapter 21 and contacts the shank portion 101, and extends in the inner diameter direction from the outer peripheral surface of the holder body 11 and is connected to the center hole 15. The adjustment member 31 is configured to be slidably abutted with an inclined surface 313 provided at a side portion of the adjustment member 31. The adjustment member 31 is a screw that is screwed into the first radial hole 17 and the first radial hole 17. And an adjustment screw 41 for defining the forward / backward movement position. The adjustment member 31 defines the protruding length of the tool 100 that is inserted into the tool holding hole 242 and protrudes from the adapter 21 via the pin portion 312 that contacts the shank portion 101.

  Therefore, by preparing a plurality of types of adapters 21, tools 100 having various specifications with different outer diameters or different overall lengths can be preset with the common holder body 11.

  According to the first embodiment, the holder main body 11 further has a flat front end surface 12 perpendicular to the axis, and the adapter 21 further has a flat rear end surface 232 perpendicular to the axis, and these front ends. Since the surface 12 and the rear end surface 232 are in close contact with each other and the adapter 21 is fixed to the holder main body 11, when the adapter 21 is connected to the holder main body 11, the deflection of the rear end surface 232 becomes substantially zero, and the axis of the adapter 21 is It can be held straight along the axis O of the main body 11.

  Further, according to the first embodiment, the engaged portion 16 of the holder main body 11 and the engaging portion 22 of the adapter 21 include a tapered tapered protrusion 222 and a round hole (the engaged portion 16 to receive the tapered protruding portion 222). ), And the inner diameter of the round hole (engaged portion 16) is slightly smaller than the outer diameter on the base side of the tapered protrusion 222 (engagement portion 22). As a result, the taper protrusion 222 is pushed into a round hole (engaged portion 16) having a slightly smaller inner diameter, and the outer periphery of the taper protrusion 222 closely contacts the inner periphery of the round hole (engaged portion 16). Thus, the engaging portion 22 is correctly positioned on the axis O that becomes the center of the holder main body 11.

  Further, the inclined surface 313 of the first embodiment is formed so as to become shallower toward the tip end side of the holder main body 11, and the tip 413 of the adjustment screw 41 contacts the inclined surface 313. Therefore, when presetting the tool holder 10 If the adjustment screw 41 is tightened and rotated upright, the tool 100 can move forward and the protruding length of the tool 100 can be adjusted continuously, and the work efficiency of the preset can be improved with a simple configuration.

  Further, a groove 314 extending in parallel with the axis O of the holder body 11 is provided on the side of the adjustment member 31 of the first embodiment. The holder body 11 is a second radial hole 18 that extends in the inner diameter direction from the outer peripheral surface of the holder body 11 and is connected to the center hole 15, and a screw that is screwed into the second radial hole 18. It further has a rotation-preventing screw 42 that locks the adjustment member 31 by engaging with the groove 314. Thereby, it is possible to prevent the adjusting member 31 from spinning in the center hole 15. Although not shown in the drawing, the inclined surface 313 may be formed into a groove bottom shape, and the inclined surface 313 and the groove 314 may be used together. In this case, only one adjusting screw 41 may be used.

  Further, the center hole 15 of the holder body 11 of the first embodiment may constitute a passage that is supplied with the cutting fluid from 132 and supplies the cutting fluid to the rear end side through hole 25 of the adapter 21. Thereby, the cutting fluid can be efficiently supplied to the tip region of the tool 100.

  Further, since the chuck portion 24 of the first embodiment is a shrink-fitting chuck type, the shank portion 101 of the tool 100 can be firmly chucked by metal thermal contraction after the presetting of the tool 100 is completed.

  Next, a second embodiment of the present invention will be described. FIG. 4 is a longitudinal sectional view showing an adapter according to the second embodiment of the present invention. About 2nd Embodiment, about the structure which is common in embodiment mentioned above, the same code | symbol is attached | subjected and description is abbreviate | omitted, and a different structure is demonstrated below. The chuck portion 24 of the second embodiment is a tapered collet chuck type. Specifically, the chuck portion 24 includes a tapered hole 72, a tapered collet 73, a lock nut 78, and a plain bearing 70.

  The tapered hole 72 is formed in the inner peripheral surface of the chuck portion 24 and extends along the axis O from the tip of the adapter 21 toward the rear. The inner diameter of the tapered hole 72 decreases from the front end side toward the rear end side, and is smoothly connected to the rear end hole 244 having a constant inner diameter on the rear end side. The rear end hole 244 also extends along the axis O, and is connected to the rear end side through hole 25 on the rear end side of the rear end hole 244. A cylindrical shank portion 101 and a cylindrical tapered collet 73 are inserted into the tapered hole 72.

  The outer peripheral surface of the taper collet 73 is a tapered surface 73t that decreases in diameter toward the rear end side, and corresponds to the tapered hole 72. The tapered surface 73t is fitted into the tapered hole 72 described above. The inner peripheral surface 73h of the taper collet 73 extends along the axis O and has the same inner diameter from the front end side to the rear end side. The shank portion 101 is inserted into the tapered collet center hole defined by the inner peripheral surface 73h.

  A ring groove 74 extending over the entire circumference is formed on the outer periphery of the taper collet 73 adjacent to the tip end side of the taper surface 73t, and the tip end outer periphery 75 of the taper collet 73 adjacent to the tip end side of the ring groove 74 is It is formed with a larger diameter than the ring groove 74. The side surface on the rear end side of the ring groove 74, that is, the boundary between the ring groove 74 and the taper surface 73t forms an annular flat surface 73k perpendicular to the axis O.

  The taper collet 73 has a slit-shaped slit 76 extending in parallel with the axis. The slit 76 extends from the tip of the taper collet 73 to the middle, and the slot 76 extends from the rear end of the taper collet 73 to the middle. All the slots 76 are arranged at equal intervals in the circumferential direction. The diameter of the taper collet 73 can be changed by pushing and shrinking the slot 76.

  A female screw 78 m formed on the inner periphery of a cylindrical lock nut 78 is screwed onto the male screw 77 formed on the outer periphery of the chuck portion 24. The lock nut 78 is screwed into the adapter 21 to push the taper collet 73 toward the rear end of the axis. The taper collet 73 is pressed against the taper hole 72 and the inner peripheral surface 73h is reduced in diameter.

  The lock nut 78 is formed at the inner end of the cylindrical portion 79 formed with an internal thread 78m that is screwed into the male screw 77 formed on the outer periphery of the distal end portion of the adapter 21, and toward the inner diameter direction. And has an inward flange portion 80 protruding therefrom. The rear end side plane 80k of the inward flange portion 80 is an annular flat surface perpendicular to the axis O. Further, the inner peripheral edge of the inward flange portion 80 is engaged with the ring groove 74 of the taper collet 73. A plain bearing 70 is interposed between the rear end side plane 80 k of the inward flange portion 80 and the plane 73 k of the taper collet 73.

  The plain bearing 70 is a type of a sliding bearing that transmits a force in the direction of the axis O while reducing friction in a direction perpendicular to the axis O, and has a ring disk shape having an outer diameter corresponding to the inner diameter of the lock nut 78. It is a board material. The inner peripheral edge of the plain bearing 70 is engaged with the ring groove 74. The rear end side end surface of the plain bearing 70 is in contact with the flat surface 73k of the taper collet 73, and the front end side end surface of the plain bearing 70 is in contact with the rear end side flat surface 80k of the inward flange portion 80. The plain bearing 70 that receives the pressing force in the direction of the axis O between the inward flange portion 80 and the taper collet 73 reduces the frictional resistance of both contact surfaces (the rear end side plane 80k and the plane 73k).

  After the presetting of the tool 100 by the adjusting screw 41 described above, the tool 100 is chucked by the chuck portion 24 of the taper collet chuck type. Chucking is performed by screwing the female screw 78m and the male screw 77 and rotating the lock nut 78 in the tightening direction. Thereby, the inward flange portion 80 pushes the taper collet 73 in the rear end direction via the plain bearing 70, the taper surface 73t is closely fitted in the taper hole 72 of the adapter 21, and the taper collet 73 is reduced in diameter. The shank part 101 of the tool 100 is chucked.

  At this time, since the plain bearing 70 is interposed between the rear end side plane 80k and the plane 73k, the frictional resistance of both contact surfaces that are in sliding contact with each other is greatly reduced. Thereby, the pushing force to the taper collet 73 by the tightening of the lock nut 78 acts uniformly.

  At this time, the taper collet 73 coincides with the axis O of the adapter 21 following the taper hole 72, and the shank portion 101 is centered along the axis O. According to the second embodiment, the shank portion 101 of the tool 100 can be firmly chucked by the wedge action of the taper collet 73 after the presetting of the tool 100 is completed. Also, by preparing the adapter 21 of the shrink-fitting chuck method of the first embodiment described above, various chuck methods can be provided.

  Next, a third embodiment of the present invention will be described. FIG. 5 is a longitudinal sectional view showing an adapter according to the third embodiment of the present invention. In the third embodiment, the same components as those in the above-described embodiment are denoted by the same reference numerals, description thereof is omitted, and different configurations are described below. The chuck portion 24 of the third embodiment is a hydro chuck type. Specifically, two hydraulic chambers 92 and 93 and a hydraulic pressure supply passage 95 are formed inside the cylindrical chuck portion 24 in the thickness direction. The hydraulic chamber 92 is a ring-shaped chamber that surrounds the tool holding hole 242 in the vicinity of the inner peripheral surface of the tool holding hole 242. The same applies to the hydraulic chamber 93, and the hydraulic chamber 93 is disposed on the tip side of the hydraulic chamber 92.

  The hydraulic chambers 92 and 93 communicate with each other through a communication passage 94. A hydraulic pressure supply passage 95 extending rearward from the hydraulic chamber 93 is connected to a pressurizing cylinder portion 96 provided in the flange portion 23. For easy understanding, the hydraulic pressure supply passage 95 and the pressurizing cylinder portion 96 are schematically shown by broken lines.

  The pressure cylinder portion 96 is a bottomed hole drilled from the outer peripheral surface of the adapter 21, and the bottom side of the pressure cylinder portion 96 is filled with hydraulic oil, and is formed on the inner peripheral surface on the opening side of the pressure cylinder portion. A male screw 97 is screwed into the female screw portion, and the bottom side of the pressure cylinder portion 96 is sealed by a piston 98 attached to the tip of the male screw 97.

  After the presetting of the tool 100 by the adjustment screw 41 described above, the tool 100 is chucked by the hydro chuck type chuck unit 24. Chucking is performed by rotating the male screw 97 in the tightening direction. As a result, the hydraulic pressure of the pressurizing cylinder portion 96 increases, and the hydraulic chambers 92 and 93 expand toward the inner diameter side of the chuck portion 24. As a result, the tool holding hole 242 near the hydraulic chambers 92 and 93 contracts to grasp the shank portion 101. At this time, the tool 100 coincides with the axis O of the adapter 21. As a result, the tool 100 is centered without tilting and chucked on the chuck portion 24 of the adapter 21.

  According to the third embodiment, the shank portion 101 of the tool 100 can be firmly chucked by hydraulic pressure after the presetting of the tool 100 is completed. Further, by preparing the other chuck type adapter 21 described above, various chuck types can be provided.

  Although the embodiments of the present invention have been described with reference to the drawings, the present invention is not limited to the illustrated embodiments. Various modifications and variations can be made to the illustrated embodiment within the same range or equivalent range as the present invention.

  The tool holder according to the present invention is advantageously used in a machine tool.

10 tool holder, 11 holder body, 12 tip surface,
13 mounting portion, 132 pull stud mounting hole, 15 center hole,
16 engaged portion, 17 first radial hole, 18 second radial hole,
21 Adapter, 22 engaging part, 222 taper protrusion part,
223 constricted portion, 23 flange portion, 232 rear end surface,
24 chuck part, 242 tool holding hole, 25 rear end side through hole,
31 adjustment member, 312 pin portion, 313 inclined surface,
314 groove, 41 adjustment screw, 42 anti-rotation screw,
422 head, 423 tip, 70 plain bearing,
72 taper hole, 73 taper collet, 73k plane,
73t taper surface, 74 ring groove, 75 tip outer periphery,
76 slot, 78 lock nut, 79 cylindrical part,
80 inward flange, 80k rear end side plane,
92, 93 hydraulic chamber, 94 communication passage, 95 hydraulic supply passage,
96 pressure cylinder, 98 piston, 100 tools,
101 Shank part, 102 Rear end face, O axis.

Claims (9)

A holder body having a mounting portion for mounting on a spindle of a machine tool in a rear end region, and an adapter removably fixed to a tip of the holder body,
The adapter extends from the center of the front end of the adapter toward the rear end side, a tool holding hole into which a shank portion of a tool is inserted, and chucks the shank portion provided in the tip end region of the adapter and inserted into the tool holding hole. An engaging portion that is provided at the center of the rear end of the adapter and that engages with an engaged portion that is provided at the center of the tip of the holder main body so that the axis of the adapter matches the axis of the holder main body. And a rear end side through hole extending through the engagement portion and connected to a hole bottom of the tool holding hole,
The holder body includes a central hole extending from the engaged portion toward the rear end, an adjustment member accommodated in the central hole and capable of moving forward and backward toward the adapter, and extending from the adjustment member toward the tip. A pin portion that penetrates the engagement portion and the rear end side through-hole of the adapter and contacts the shank portion; a first radial hole that extends from the outer peripheral surface of the holder body in the inner diameter direction and is connected to the center hole; And a screw screwed into the first radial hole, the tip of which is slidably in contact with an inclined surface provided on a side portion of the adjustment member to regulate the advance / retreat position of the adjustment member Have
The adjustment member is a tool holder that defines a protruding length of the tool that is inserted into the tool holding hole and protrudes from the adapter via the pin portion that contacts the shank portion.   The holder main body further includes a flat front end surface perpendicular to the axis, and the adapter further includes a flat rear end surface perpendicular to the axis, and the front end surface and the rear end surface are in close contact with each other to mount the adapter. The tool holder according to claim 1, wherein the tool holder is fixed to the holder body. The engaged portion of the holder body and the engaging portion of the adapter are a combination of a tapered taper protrusion and a round hole that receives the taper protrusion,
The tool holder according to claim 2, wherein an inner diameter of the round hole is slightly smaller than an outer diameter of a base side of the tapered protrusion.   The tool holder according to any one of claims 1 to 3, wherein the inclined surface is formed so as to become shallower toward a tip side of the holder body, and a tip of the adjustment screw abuts on the inclined surface. On the side of the adjustment member, a groove extending in parallel with the axis of the holder body is provided,
The holder main body is a second radial hole extending in an inner diameter direction from the outer peripheral surface of the holder main body and connected to the center hole, and a screw screwed into the second radial hole, and a tip thereof is the strip. The tool holder according to any one of claims 1 to 4, further comprising a detent screw that prevents the adjustment member from rotating by engaging with the groove.   The tool holder according to any one of claims 1 to 5, wherein the center hole of the holder main body constitutes a passage for supplying cutting fluid to the rear end side through hole of the adapter.   The tool holder according to claim 1, wherein the chuck portion of the adapter is a shrink fit chuck system.   The tool holder according to claim 1, wherein the chuck portion of the adapter is a taper collet chuck system.   The tool holder according to claim 1, wherein the chuck portion of the adapter is a hydro chuck type.

Images