Strongly bonded structure between collet and cutter

Abstract

To provide a strong coupling structure between a collet and a cutter that improves the efficiency and quality of processing. [Solution] The coupling structure includes a collet 10, a cutter 20, a fixing member 30, and a lock cover 40. Inside the collet, a tapered hole 12, a receiving hole 11, and a lock hole 13 are formed in this order. The cutter includes an engagement hole 23A having a polygonal outline, and a tapered coupling portion 21 is inserted into the tapered hole. The fixing member includes an abutment block 31 provided in the receiving hole, a screwing portion 32 screwed into the lock hole, and an engagement portion 33A having a polygonal cross section and engaged with the engagement hole of the cutter. The lock cover is coupled to the collet. The engagement portion of the fixing member is engaged with the engagement hole of the cutter, and the abutment block of the fixing member abuts against the bottom surface of the receiving hole, firmly coupling the collet and the cutter.

Description

[Technical field]

[0001] The present invention relates to a processing device, and more particularly to a strong coupling structure between a collet and a cutter, which improves the efficiency and quality of processing. [Background technology]

[0002] Normally, when cutting or drilling a workpiece, the cutting operation must be performed by driving a cutter with a machining spindle, and a collet is required to connect the cutter to the machining spindle.

[0003] A conventional strong coupling device between a collet and a cutter includes a collet and a cutter, the cutter being rod-shaped and having opposite ends, one end of which is provided with a blade and the other end is fixed inside the collet, however, in this structure, when cutting or drilling is performed by driving the collet and the cutter with a spindle, the workpiece to be machined has a strong resistance to the collet and the cutter, which causes a problem that the collet and the rod-shaped cutter easily rotate relative to each other.

[0004] Such collet and cutter that easily rotate relative to each other not only result in poor machining efficiency, but also have the risk of adversely affecting the machining quality of the workpiece. Summary of the Invention [Problem to be solved by the invention]

[0005] The present invention has been made in consideration of the above problems, and aims to provide a strong connection structure between a collet and a cutter that improves processing efficiency and quality. [Means for solving the problem]

[0006] In order to achieve the above object, the present invention A strong joint structure between a collet and a cutter, comprising a collet, a cutter, a fixing member, and a lock cover, the collet includes opposite ends, a receiving hole formed inside the collet and having a bottom surface, a tapered hole extending from one end of the collet to the receiving hole and communicating with the receiving hole, the diameter of the tapered hole decreasing toward the receiving hole, and a locking hole extending from the other end of the collet to the bottom surface of the receiving hole and communicating with the receiving hole, the locking hole including an internal thread; The cutter has a tapered shape, a contact end and an insertion end that are positioned opposite to each other and are inserted into the tapered hole, a coupling portion whose outer diameter decreases from the contact end to the insertion end, an engagement hole that extends from the insertion end to the contact end and has a polygonal outline, an extension rod that protrudes from the contact end and has a processing end that is distant from the coupling portion, and at least one processing member that is attached to the processing end, the fixing member is located inside the collet, includes a contact block that is block-shaped and provided in the accommodating hole, has first and second end faces positioned opposite to each other, and has an outer diameter smaller than the diameter of the accommodating hole; a screw portion that is provided on the first end face of the contact block, has an external thread, and is screwed into the lock hole, the first end face abuts against a bottom face of the accommodating hole, and a pitch is formed between the second end face and an insertion end of the coupling portion; and an engagement portion that is provided on the second end face of the contact block, has a polygonal cross section, and is inserted into the engagement hole and engaged with the engagement hole, a lock cover coupled to the collet and pressed against the abutting end, and having a through hole through which the extension rod and the processing member pass; proposed. Effect of the Invention

[0007] In the present invention, a fixed member is provided inside the collet, and the engagement portion of the fixed member is inserted into and engaged in the engagement hole of the cutter, while the first end face of the abutment block of the fixed member abuts against the bottom surface of the accommodating hole, so that the cutter resists the reaction force during processing and makes it difficult for it to rotate relative to the collet, thereby improving both the processing efficiency and the processing quality. [Brief description of the drawings]

[0008] [Figure 1] 1 is a schematic perspective view of the first preferred embodiment of the present invention; FIG. [Diagram 2] FIG. 2 is an exploded schematic view of components according to the first preferred embodiment of the present invention; [Diagram 3] 1 is a schematic perspective view of a fixing member according to the first preferred embodiment of the present invention; FIG. [Figure 4] 1 is a schematic side view of the first preferred embodiment of the present invention; FIG. [Diagram 5] 1 is a schematic partial cross-sectional view of a first preferred embodiment of the present invention; [Figure 6] FIG. 6 is a schematic cross-sectional view taken along line AA in FIG. 5 of the first preferred embodiment of the present invention; [Figure 7] FIG. 2 is an exploded schematic view of some components of the first preferred embodiment of the present invention; [Figure 8] FIG. 11 is an exploded schematic view of some components of the second preferred embodiment of the present invention; [Figure 9] FIG. 11 is an exploded schematic view of some components according to the third preferred embodiment of the present invention; [Figure 10] FIG. 13 is an exploded schematic view of some components of the fourth preferred embodiment of the present invention; [Figure 11] FIG. 2 is a schematic cross-sectional view of the second preferred embodiment of the present invention; [Figure 12] FIG. 11 is a schematic cross-sectional view of the third preferred embodiment of the present invention; DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0009] As shown in FIGS. 1 to 7, a preferred embodiment of a strong coupling structure between a collet and a cutter according to the present invention includes a collet 10, a cutter 20, a fixing member 30, and a locking cover 40. As shown in FIG.

[0010] As shown in Figures 1 to 7, collet 10 includes opposed ends, receiving hole 11, tapered hole 12, locking hole 13, and threaded segment 14, of which receiving hole 11 is formed inside collet 10 and has a bottom surface 111. Tapered hole 12 extends from one end of collet 10 to receiving hole 11 and the diameter of tapered hole 12 decreases toward receiving hole 11. Locking hole 13 extends from the other end of collet 10 to bottom surface 111 of receiving hole 11, communicates with receiving hole 11, and includes internal threads. Threaded segment 14 and tapered hole 12 are provided at the same end of collet 10 and have external threads.

[0011] As shown in FIG. 1 to FIG. 7, the cutter 20 includes a joint portion 21, a stretch rod 22, an engagement hole 23A, an inlet flow passage 24, a communication flow passage 25, two outlet flow passages 26, and two processing members 27. The joint portion 21 has a tapered shape and has a contact end and an insertion end that is inserted into the tapered hole 12, and the outer diameter of the joint portion 21 decreases from the contact end to the insertion end. The stretch rod 22 protrudes from the contact end and has a processing end away from the joint portion 21. The engagement hole 23A extends from the insertion end to the contact end and has a polygonal outline. The inlet flow passage 24 extends from the bottom of the engagement hole 23A toward the processing end of the stretch rod 22. The communication flow passage 25 communicates with the inlet flow passage 24 and extends toward the processing end of the stretch rod 22. Two outlet channels 26 approach the working end of the stretch rod 22 and communicate with the communication channels 25. Two working members 27 are attached to the working end of the stretch rod 22.

[0012] As shown in FIGS. 1 to 7, the engagement hole 23A, the inlet passage 24, and the communication passage 25 communicate with the same axis.

[0013] As shown in FIGS. 1 to 7, the fixing member 30 is located inside the collet 10 and includes an abutment block 31, a screwing portion 32, an engagement portion 33A, two wrench holes 34, and a communication hole 35. The abutment block 31 is provided in the accommodation hole 11, has a block shape, and has a first end surface 311 and a second end surface 312 that are positioned opposite to each other. The screwing portion 32 is provided on the first end surface 311 of the abutment block 31 and has an external thread. When the screwing portion 32 is screwed into the lock hole 13 of the collet 10, the first end surface 311 of the abutment block 31 abuts against the bottom surface 111 of the accommodation hole 11. The engagement portion 33A is provided on the second end surface 312 of the abutment block 31 and has a polygonal cross section. The engagement portion 33A is inserted into the engagement hole 23A of the cutter 20. The two wrench holes 34 are formed in the threaded portion 32 and the engaging portion 33A, respectively, extend along the threaded portion 32 and the engaging portion 33A, and have a polygonal outline. In the present invention, the outline of each wrench hole 34 is hexagonal to correspond to a hexagonal wrench, making it easier for the user to attach and detach the fixing member 30, and the communication hole 35 is provided inside the abutment block 31, and the two wrench holes 34 communicate with the same axis.

[0014] As shown in Figures 1 to 7, in the present invention, the outer diameter of the abutment block 31 of the fixed member 30 is smaller than the diameter of the accommodating hole 11 of the collet 10, so that the screw-engaging portion 32 of the fixed member 30 can be smoothly screwed into and attached to the lock hole 13 of the collet 10, and the first end face 311 of the abutment block 31 is abutted against the bottom surface 111 of the accommodating hole 11, and a pitch is formed between the insertion end of the connecting portion 21 of the cutter 20 and the second end face 312 of the abutment block 31 of the fixed member 30.

[0015] As shown in Figures 1 to 7, in a first preferred embodiment of the present invention, the cross section of the engagement portion 33A of the fixing member 30 is made hexagonal, and the contour of the engagement hole 23A of the cutter 20 is also made hexagonal to correspond to the cross section of the engagement portion 33A, thereby enabling the engagement portion 33A and the engagement hole 23A to be engaged with each other.

[0016] As shown in Figures 1 to 7, the lock cover 40 includes an internal thread and a through hole 41, and is screwed and connected to the threaded segment 14 of the collet 10, and abuts against the abutment end of the connecting portion 21 of the cutter 20, and the extension rod 22 and two processing members 27 of the cutter 20 pass through the through hole 41 of the lock cover 40.

[0017] Compared with the conventional strong coupling device between the collet and the cutter, in the present invention, a fixing member 30 is installed that is firmly installed inside the collet 10 and has an engagement portion 33A with a polygonal outline, and an engagement hole 23A corresponding to the insertion end of the coupling portion 21 of the cutter 20 is formed, and the engagement portion 33A and the engagement hole 23A are locked together to prevent relative rotation between the cutter 20 and the collet 10. In this way, when machining a workpiece with the present invention, the cutter 20 resists the reaction force from the workpiece, so that the efficiency of machining can be improved and the quality of machining can also be improved.

[0018] Moreover, the cutting fluid can cool the two workpieces 27 via the communication hole 35 of the fixed member 30, the inlet flow passage 24, the communication flow passage 25, and the two outlet flow passages 26 of the cutter 20.

[0019] As shown in Figures 8 and 11, the second preferred embodiment of the present invention is similar to the first preferred embodiment, but the difference between the two is that the cross section of the engagement portion 33B of the fixed member 30 is pentagonal to correspond to the contour of the engagement hole 23B of the cutter 20, thereby allowing the engagement portion 33B and the engagement hole 23B to be engaged with each other, and the cutter 20 is firmly connected to the collet 10 by the fixed member 30, thereby enabling stable and efficient processing.

[0020] As shown in Figures 9 and 12, the third preferred embodiment of the present invention is similar to the first and second preferred embodiments, but differs in that the cross section of the engagement portion 33C of the fixing member 30 is rectangular to correspond to the contour of the engagement hole 23C of the cutter 20, so that the engagement portion 33C and the engagement hole 23C can be engaged with each other in the same manner, thereby enabling stable and efficient processing.

[0021] In the present invention, the cross-sections of the engagement portions 33A, 33B, 33C of the fixing member 30 and the contours of the engagement holes 23A, 23B, 23C of the cutter 20 are not particularly limited as long as the engagement portions 33A, 33B, 33C and the engagement holes 23A, 23B, 23C can be engaged with each other.

[0022] In the first to third preferred embodiments of the present invention, each of the processing members 27 is a cutting blade for processing.

[0023] 10, the fourth preferred embodiment of the present invention is similar to the first preferred embodiment, except that the stretch rod 22 of the cutter 20 is an elongated conical rod, and the outer diameter of the stretch rod 22 decreases toward the working end of the stretch rod 22. Also, the working member 27 of the stretch rod 22 is a drill head. [Explanation of symbols]

[0024] 10. Colette 11. Storage hole 111 Bottom 12 Tapered hole 13 Lock hole 14 Threaded Segment 20 Cutter 21 Joint 22 Extension rod 23A, 23B, 23C engaging hole 24 Inlet channel 25 Connecting flow path 26 Outlet flow path 27 Processing materials 30 Fixing member 31 Contact block 311 1st end face 312 Second end face 32 Threaded joint 33A, 33B, 33C engaging part 34 Wrench hole 35 Communication hole 40 Lock Cover 41 Through hole

Claims

1. A strong joint structure between a collet and a cutter, comprising a collet, a cutter, a fixing member, and a lock cover, the collet includes opposite ends, a receiving hole formed inside the collet and having a bottom surface, a tapered hole extending from one end of the collet to the receiving hole and communicating with the receiving hole, the diameter of the tapered hole decreasing toward the receiving hole, and a locking hole extending from the other end of the collet to the bottom surface of the receiving hole and communicating with the receiving hole, the locking hole including an internal thread; The cutter has a tapered shape, a contact end and an insertion end that are positioned opposite to each other and are inserted into the tapered hole, a coupling portion whose outer diameter decreases from the contact end to the insertion end, an engagement hole that extends from the insertion end to the contact end and has a polygonal outline, an extension rod that protrudes from the contact end and has a processing end that is distant from the coupling portion, and at least one processing member that is attached to the processing end, the fixing member is located inside the collet, includes a contact block provided in the accommodating hole, having a block shape, first and second end faces positioned opposite to each other, and an outer diameter smaller than the diameter of the accommodating hole; a screw portion provided on the first end face of the contact block, having an external thread, and screwed into the lock hole, the first end face abutting against a bottom face of the accommodating hole, and a pitch is formed between the second end face and an insertion end of the coupling portion; and an engagement portion provided on the second end face of the contact block, having a polygonal cross section, and being inserted into the engagement hole and engaged with the engagement hole, The lock cover is connected to the collet and pressed against the abutment end, and has through holes through which the extension rod and the processing member pass.

2. 2. A strong coupling structure between a collet and a cutter as described in claim 1, characterized in that the fixing member has two wrench holes, which are formed in the threaded portion and the engaging portion, respectively, extend along the threaded portion and the engaging portion, and have a polygonal contour.

3. 3. The strong joint structure between the collet and the cutter according to claim 2, wherein the contours of the wrench holes are each hexagonal.

4. The cutter includes an inlet flow passage extending from a bottom of the engagement hole toward the processing end, a communication flow passage communicating with the inlet flow passage and extending toward the processing end, and two outlet flow passages approaching the processing end and communicating with the communication flow passages, 3. The strong joint structure between a collet and a cutter according to claim 2, wherein the fixing member is provided inside the abutment block and includes a communication hole communicating with the two wrench holes.

5. 5. The strong coupling structure of a collet and a cutter according to claim 4, wherein each of said processing members is a cutting blade.

6. the collet includes a threaded segment having external threads at the same end of the collet as the tapered bore; 6. The strong coupling structure between the collet and the cutter according to claim 5, wherein the lock cover is formed with an internal thread that is screwed into the screw-fitting segment.

7. 2. The strong coupling structure between a collet and a cutter as claimed in claim 1, wherein the stretch rod is an elongated conical rod whose outer diameter decreases towards the working end of the stretch rod.

8. A strong joint structure between a collet and a cutter as described in any one of claims 1 to 7, characterized in that the cross section of the engagement portion is hexagonal, and the contour of the engagement hole is hexagonal to correspond to the cross section of the engagement portion.

9. A strong coupling structure between a collet and a cutter as described in any one of claims 1 to 7, characterized in that the cross section of the engagement portion is pentagonal, and the contour of the engagement hole is pentagonal to correspond to the cross section of the engagement portion.

10. A strong joint structure between a collet and a cutter as described in any one of claims 1 to 7, characterized in that the cross section of the engagement portion is rectangular, and the contour of the engagement hole is rectangular to correspond to the cross section of the engagement portion.

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