JP3069855U - Tool holder - Google Patents

Abstract

(57) [Summary] [Problem] To reduce the production cost because there are few assembly members,
Provide a tool holder with significantly improved processing accuracy and excellent gripping force on the tool. SOLUTION: An elastic tightening ring (40) is inserted into contact with an end of a spindle (31) inserted in a main shaft (30) of a machine tool, and a plurality of chuck claws ( 43), and the main spindle (3) is provided on the outer peripheral surface of the hollow cutting tool (50) which is connected to the main spindle (30).
In the bite holder formed with the tapered portion (51) in close contact with the inner peripheral wall (32) of the bit (50), the spindle (3) of the bite (50) is formed.
A screw rod (60) is screwed into the center of the side to be connected with the screw rod (0), and a locking collar (62) is provided at the end of the screw rod (60) in the outer diameter direction. The tool is extended out of the cutting tool (50) so as to face between the chuck claws (43), and when the elastic tightening ring (40) is tightened to reduce the diameter, the chuck claws (43) are moved. Grasp the locking collar (62).

Description

[Detailed description of the invention]

[0001]

[Technical field to which the invention belongs]

 The present invention relates to a tool holder, and more particularly to a tool holder that has a small number of members, can reduce production cost, greatly improves processing accuracy, and has excellent gripping force on a tool.

[0002]

[Prior art]

 Incidentally, as shown in the example of FIG. 6, in the conventional BT tool holder 10, a spindle 111 is inserted inside a main shaft 11, a clamp 12 is connected to a front end of the spindle 111, and the clamp 12 is The byte 13 is extended from the front end of the main spindle 11 into the bite holding hole 112 having a divergent taper, and the byte 13 is inserted into the bite holding hole 112 of the main shaft 11 from the shank 131 having the same taper, and is inserted into the end of the shank 131. When the head 13 is inserted into the clamp 12 when the byte 13 is inserted into the main shaft 11 by forming a head 132 that protrudes in a brim shape, the spindle 111 is retracted. The clamp 12 is squeezed by the inner peripheral wall of the main shaft 11 and contracts in diameter, the head is tightened, and the bit 13 is pulled inward to be firmly connected to the main shaft 11. Although it has the effect of holding the cutting tool 13, the shank 131 of the cutting tool 13 is solid Because it is not the volume or weight size Ibakari in contact simply tapered surface byte 13 and the main shaft 11, poor balance during operation, not good precision on the work.

FIGS. 7 and 8 show a conventional HSK tool holder 20, which mainly includes a spindle 21 mounted on a main shaft 21 and a tension rod 23 having a divergent taper on a part of an outer peripheral wall at a front end of the spindle 22. And an elastic tightening ring 24 whose outer periphery is equally divided by a plurality of slits is fitted around the circumference of the tension rod 23, and a shoulder 241 protrudes around a front end edge of the elastic tightening ring 24. It will be installed on a protruding line. A taper portion 211 is provided on the inner peripheral wall of the main shaft 21, a tip end surface is formed in an annular contact portion 212, and a cutting tool 25 having a hollow shank portion coupled to the main shaft 21 is provided on the outer peripheral surface of the shank portion. Is provided on a tapered portion 251 that matches the inner peripheral wall of the main shaft 21 to form a protruding edge 252 extending radially behind the tapered portion 251, and a locking edge 253 is provided at an appropriate position on the inner peripheral wall of the cutting tool 25. The centering rod 26 is screwed by providing a screw hole 254 in the hollow inside of the cutting tool 25. Then, when assembling, the taper portion 251 of the cutting tool 25 is inserted into the main shaft 21 so that the taper portion 251 and the taper portion 211 of the inner peripheral wall of the main shaft 21 are brought into close contact with each other, while the end of the centering rod 26 is pulled by the tension. When inserted into the rod 23, at this time, there is still an appropriate gap 27 between the protruding edge 252 of the cutting tool 25 and the contact portion 212 of the main shaft 21, and when the spindle 22 is pulled backward, The pulling rod 23 moves inward integrally, and the tapered outer wall of the pulling rod 23 stretches the split end of the elastic tightening ring 24 to expand, and the shoulder 241 of the elastic tightening ring 24 The tool 25 is hooked on the locking edge 253 of the inner peripheral wall of the tool 25 and the tool 25 is pulled inward. A rigid connection is formed by double-sided contact, and the cutting tool 25 is provided in a hollow shape to significantly reduce the weight. Stability of HSK toolholder 20 from the bond is enhanced that can increase the relative machining accuracy. However, this kind of HSK tool holder 20 has a large number of members, each having a certain degree of tolerance, and as the number of assembled members increases, it becomes difficult to grasp the accumulated tolerance. There is a problem that manufacturing becomes difficult because it must be small.

[0004]

[Problems to be solved by the invention]

 In view of the above-mentioned problems with the conventional tool holder, the present invention provides a tool holder having a small number of assembling members, capable of reducing costs, greatly improving machining accuracy, and having an excellent gripping force on the tool. Aim.

[0005]

[Means for Solving the Problems]

 In order to achieve the above object, the present invention provides an elastic tightening ring inserted into an end of a spindle inserted in a main shaft of a machine tool, and a plurality of chuck claws are provided around the elastic tightening ring. And a bite holder having a tapered portion formed on the outer peripheral surface of the hollow bite, which is connected to the main shaft, in close contact with the inner peripheral wall of the main shaft, wherein a threaded rod is threaded inside the center of the side of the bite connected to the main shaft. At the end of the screw rod, there is provided a locking flange protruding in the outer diameter direction, and the locking collar is extended out of the cutting tool so as to face the inside of the elastic tightening ring. When the ring is tightened to reduce the diameter, each chuck pawl is configured to grip the locking collar.

In the present invention having the above-described structure, when the tool is inserted into the spindle, the taper portion of the tool and the inner peripheral wall of the spindle are brought into close contact with each other, and when the spindle is retracted, the elastic tightening ring is formed. Also moves backward, and the chuck claws of the elastic tightening ring are pressed against the inner peripheral wall of the main shaft and converge on the peripheral surface of the rod body, while the inner surfaces of the chuck claws grip the locking flange of the threaded rod to hold the cutting tool. The tool can be pulled in the direction of the spindle to firmly couple the cutting tool and the spindle. To loosen the cutting tool, push the spindle toward the cutting tool to automatically open the chuck jaws on the outer surface of the elastic ring, release the grip of the screw rod against the locking flange, and release the rod body. The cutting tool can be pushed directly against the end of the locking collar.

[0007]

[Embodiment of the invention]

 Hereinafter, the present invention will be specifically described based on embodiments, but the present invention is not limited to only this example. First, as shown in FIGS. 1 and 2, a relatively preferred embodiment of the tool holder of the present invention is an improvement on the HSK tool holder, which is mainly inserted into the spindle 30 of the integrated machine tool. An elastic tightening ring 40 is inserted into and contacted with the end of the spindle 31, and as shown in FIGS. 3 and 4, the elastic tightening ring 40 has a convex ring 42 provided around an intermediate portion of the rod body 41. A plurality of chuck claws 43 are provided on the inner side, and these chuck claws 43 cover the circumference of the rod body 41, all of which are hollow bits similar to conventional ISO (International Organization for Standardization) standard bytes. The outer peripheral surface of the main shaft 30 to be joined to the main shaft 30 is formed in a tapered portion 51 that comes into close contact with the inner peripheral wall 32 of the main shaft 30, and a contact end portion 52 is provided at an appropriate end of the cutting tool 50. The cutting tool 50 is provided with a screw hole 53 at the center of the inside thereof. The screw rod 60 is screwed into the screw hole 53 by the screw step portion 61, and extends outward at the end of the screw rod 60. A stop collar 62 is provided, and the locking collar 62 is extended out of the cutting tool 50 so as to face between the chuck claws 43. A shoulder 44 is provided around the outer peripheral edge of the front end of each chuck claw 43. A hooked portion 45 protruding radially is formed on the inner peripheral edge of the front end.

[0008] The above is a description of the main members of the present invention and the structural features thereof. Next, the use situation and principle of the present invention will be described. When using, the tool 50 is inserted into the spindle 30 and the tapered portion 51 of the tool 50 and the inner peripheral wall 32 of the spindle 30 are brought into close contact with each other. There is still a gap 70. In this case, when the spindle is pulled backward, the elastic tightening ring 40 also moves backward, and the chuck pawl 43 of the elastic tightening ring 40 pushes the shoulder 44 against the inner peripheral wall of the main shaft 30. While being pressed and converging toward the circumferential surface of the rod body 41, the hooked portion 45 in the chuck claw 43 grips the locking collar 62 of the screw rod 60 and pulls the bite 50 toward the main shaft 30. The contact end 52 is brought into tight contact with the end face of the main shaft 30 to complete the gripping operation of the cutting tool 50. To loosen the cutting tool, push the spindle 31 toward the cutting tool 50, the chuck jaws 43 on the outer surface of the elastic tightening ring 40 are automatically opened, and the screw rod 60 is gripped by the locking collar 62. And the rod body 41 abuts against the end of the locking collar 62 to directly push the cutting tool 50.

As shown in FIG. 5, the bite 50 is a member of an ISO standard HSK bite holder, and the screw rod 60 of the present invention is screwed to the bite 50 by a screw step 61. The conventional centering rod 26 may be directly replaced by the threaded rod 60, so that the members of the present invention have good interchangeability and can achieve the standardized member commonality.

[0010]

[Effect of the invention]

 The present invention configured as described above has the following advantages and effects. 1. By installing the screw rod inside the cutting tool and the chuck claw outside the elastic tightening ring, the gripping operation of the cutting tool is assured, and the connection between the cutting tool and the spindle is extremely strong. 2. Since the effect of gripping the cutting tool is achieved simply by connecting the screw rod and the chuck jaw, the assembly is simpler than before, the number of members is small, and the manufacturing cost can be greatly reduced. 3. Since the HSK tool holder is an improvement, the tool bit conforms to the ISO standard, and therefore has good compatibility and can achieve the commonality of standardized parts.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view of a relatively preferred embodiment of the present invention;

FIG. 2 is a sectional view showing a form in which the cutting tool in the embodiment is released.

FIG. 3 is a three-dimensional exploded view of the elastic fastening ring in the embodiment.

FIG. 4 is a three-dimensional view of the elastic fastening ring in the embodiment.

FIG. 5 is a sectional view showing a form in which the screw rod in the cutting tool in the embodiment can be replaced.

FIG. 6 is a sectional view showing a conventional BT tool holder structure.

FIG. 7 is a cross-sectional view showing a state in which a cutting tool is held in a conventional HSK tool holder.

FIG. 8 is a cross-sectional view showing a state where a cutting tool in a conventional HSK tool holder is released.

[Explanation of symbols]

 30 Main shaft 31 Spindle 32 Inner peripheral wall 40 Elastic tightening ring 41 Rod body 42 Convex ring 43 Chuck jaw 44 Shoulder 45 Hooked part 50 Byte 51 Taper part 52 Contact end 53 Screw hole 60 Screw rod 61 Screw step 62 Locking collar 70 gap

Claims (1)

[Utility model registration claims] An elastic tightening ring is inserted into and contacted with an end of a spindle inserted into a main shaft of a machine tool, a plurality of chuck claws are provided around a periphery of the elastic tightening ring, and coupled with the main shaft of a hollow cutting tool. In a bite holder having a tapered portion formed in close contact with the inner peripheral wall of the main shaft on the outer peripheral surface to be formed, a screw rod is screwed into the center of the side of the bite connected to the main shaft, and the screw rod is externally attached to the end of the screw rod. Providing a locking collar that protrudes in the radial direction, extending the locking collar outside the cutting tool so as to face the inside of the elastic locking ring, and when the elastic locking ring is tightened to reduce the diameter, A tool holder in which each chuck claw grips the locking collar.