Cutter holder assembly with joint connector

Abstract

A cutter holder assembly, comprising: a cutter holder (10) which has the following features: two opposite ends; a receiving hole (11) which is positioned inside the cutter holder (10) and has a lower surface (111); a conical hole (12) extending from one of the two ends of the cutter holder (10) to the receiving hole (11), communicating with the receiving hole (11) and having a diameter that gradually decreases towards the receiving hole (11); and a connecting hole (13) extending from the other of the two ends of the cutter holder (10) to the lower surface (111) of the receiving hole (11), is connected to the receiving hole (11) and has an internal thread; a cutting unit (20) comprising the following: an assembly section (21) which is cone-shaped and has the following features: a pressed end; an insertion end which is located opposite the pressed end and is inserted into the conical hole (12); a diameter that gradually decreases from the pressed end to the insertion end; an engagement hole (23A / 23B / 23C) extending from the insertion end to the pressed end and having a polygonal contour; an extension rod (22) extending away from the pressed end and having a machining end extending away from the assembly section (21); and at least one machining tool (27) that is mounted at the machining end; a joint connector (30) positioned within the cutter holder (10) and comprising the following: an abutting block (31) positioned within the receiving hole (11), a block having a first end face (311) and a second end face (312) opposite each other, and having a diameter smaller than the diameter of the receiving hole (11); a connecting part section (32) which is positioned on the first end face (311), has an external thread and is screwed in within the connecting hole (13); and an engagement section (33A / 33B / 33C) positioned at the second end face (312) and having a polygonal cross-section, inserted into and engaging the engagement hole (23A / 23B / 23C); and a nut (40) connected to the cutter holder (10) abuts the pressed end and has a through hole (41), wherein the extension rod (22) and the at least one machining tool (27) protrude from the through hole (41).

Description

1. Area of ​​the utility model

[0001] The present utility model relates to an accessory of a machining device and in particular to a cutter holder assembly with a joint connector. 2. Description of the state of the art

[0002] To mill or drill a workpiece, a cutter is driven by a spindle to machine the workpiece. A cutter holder is inserted between the cutter and the spindle to connect them.

[0003] A conventional cutter holder assembly comprises a cutter holder and a cutting unit. The cutting unit is a rod with two opposing ends. A cutter is positioned at one of the two ends of the cutting unit. The other of the two ends of the cutting unit is fixed within the cutter holder. However, when the cutting unit and cutter holder are actuated to mill or drill the workpiece, a large resistance force is exerted on the cutting unit and cutter holder, which is why the cutting unit and cutter holder tend to rotate relative to each other.

[0004] The cutting unit and cutter holder, which simply rotate relative to each other, cause machining inefficiency and even lead to a negative effect on the workpiece.

[0005] To overcome the deficiencies of the conventional cutter holder assembly, the present utility model provides a cutter holder assembly with a hinge connector to mitigate or avoid the above-mentioned problems.

[0006] The main object of the present utility model is to provide a cutter holder assembly having a joint connector capable of firmly combining a cutting unit and a cutter holder thereof.

[0007] The cutter holder assembly includes a cutter holder, a cutting unit, a joint connector, and a nut. The cutter holder has a receiving hole, a tapered hole, and a connecting hole positioned therein and communicating with each other. The cutting unit includes an assembly portion inserted into the tapered hole, a polygonal engagement hole, an extension rod extending from the assembly portion, and at least one machining tool mounted on the extension rod. The joint connector is positioned in the receiving hole and has a connecting portion threaded within the engagement hole and an engagement portion engaging the engagement hole. The nut is connected to the cutter holder.The joint connector is fixed inside the cutter holder and engages with the cutting unit to firmly connect the cutter holder and the cutting unit and improve the machining efficiency and quality of the cutter holder assembly.

[0008] Further tasks, advantages and novel features of the utility model emerge from the following detailed description in conjunction with the enclosed drawings.

[0009] The following applies to the drawings: Fig. 1 is a perspective view of a first embodiment of a cutter holder assembly according to the present invention; Fig. 2 is an exploded perspective view of the cutter holder assembly in Fig. 1; Fig. 3 is a perspective view of a joint connector of the cutter holder assembly in Fig. 1; Fig. 4 is a side view of the cutter holder assembly in Fig. 1; Fig. 5 is an enlarged side sectional view of the cutter holder assembly in Fig. 1; Fig. 6 is a cross-sectional rear view of the cutter holder assembly taken across line 6-6 in Fig. 5; Fig. 7 is a partially exploded perspective view of the cutter holder assembly in Fig. 1; Fig. 8 is a partially exploded perspective view of a second embodiment of the cutter holder assembly according to the present invention; Fig. 9 is a partially exploded perspective view of a third embodiment of the cutter holder assembly according to the present invention; Fig. 10 is a partially exploded view of the fourth embodiment of the cutter holder assembly according to the present invention; Fig. 11 is a cross-sectional rear view of the cutter holder assembly in Fig. 8; and Fig. 12 is a cross-sectional rear view of the cutter holder assembly in Fig. 9.

[0010] With reference to the Fig. 1 to 7, a cutter holder assembly according to the present utility model comprises a cutter holder 10, a cutting unit 20, a joint connector 30 and a nut 40.

[0011] With reference to the Fig. 1 to 7, the cutter holder 10 has two opposite ends, a receiving hole 11, a tapered hole 12, a connecting hole 13, and a mounting portion 14. The receiving hole 11 is positioned inside the cutter holder 10 and has a bottom surface 111. The tapered hole 12 extends from one of the two ends of the cutter holder 10 toward the receiving hole 11 and communicates with the receiving hole 11. A diameter of the tapered hole 12 gradually decreases toward the receiving hole 12. The connecting hole 13 extends from the other of the two ends of the cutter holder 10 toward the bottom surface 111 of the receiving hole 11. The connecting hole 13 communicates with the receiving hole and has an internal thread. The mounting portion 14 and the conical hole 12 are positioned at the same end of the cutter holder 10. The mounting portion 14 has an external thread.

[0012] With reference to the Fig. 1 to 7, the cutting unit 20 includes an assembly portion 21, an extension rod 22, an engaging hole 23A, an inlet channel 24, a communication channel 25, two outlet channels 26, and two machining tools 27. The assembly portion 21 is conical and has a pressed end and an insertion end that are opposite in position to each other. The insertion end is inserted into the conical hole 12. A diameter of the assembly portion 21 gradually decreases from the pressed end to the insertion end of the assembly portion 21. The extension rod 22 extends from the pressed end of the assembly portion 21 and has a machining end extending from the assembly portion 21. The engaging hole 23A extends from the insertion end to the pressed end and has a polygonal contour.The inlet channel 24 extends from a bottom of the engagement hole 23A toward the machining end of the extension rod 22. The communication channel 25 is in fluid communication with the inlet channel 24 and extends toward the machining end of the extension rod 22. The two outlet channels 26 are positioned adjacent to the machining end of the extension rod 22 and are in fluid communication with the communication channel 25. The two machining tools 27 are mounted on the machining end of the extension rod 22.

[0013] With reference to the Fig. 1 to 7, the engagement hole 23A, the inlet channel 24 and the communication channel 25 are coaxially in fluid communication with each other.

[0014] With reference to the Fig. 1 to 7, the hinge connector 30 is positioned within the cutter holder 10 and includes an abutting block 31, a connecting portion 32, an engaging portion 33A, two keyholes 34, and a communication hole 35. The abutting block 31 is positioned within the receiving hole 10 and is a block having a first end surface 311 and a second end surface 312 that are opposite to each other in position. The connecting portion 32 is positioned on the first end surface 311 and has an external thread. The connecting portion 32 is screwed within the connecting hole 13 of the cutter holder 10 and causes the first end surface 311 of the abutting block 31 to abut against the bottom surface 111 of the receiving hole 11.

[0015] With reference to the Fig. 1 to 7, the engaging portion 33A is positioned on the second end surface 312 of the abutting block 31 and has a polygonal cross section. The engaging portion 33A is inserted into the engaging hole 23A of the cutting unit 20. The two keyholes 34 are positioned within the connecting portion 32 and the engaging portion 33A, respectively, and extend along the connecting portion 32 and the engaging portion 33A, respectively. Each of the two keyholes 34 has a polygonal contour. In the embodiment of the present utility model, the contour of each keyhole 34 is shaped like a hexagonal key, so as to be hexagonal. The hexagonal key can be inserted into either of the two keyholes 34 to install or remove the hinge connector 30.The communication hole 35 is positioned within the abutting block 31 and is coaxially fluidically connected to the two keyholes 34.

[0016] With reference to the Fig. 1 to 7, in the present utility model, an outer diameter is smaller than a diameter of the receiving hole 11 to ensure smooth screwing of the connecting portion 32 to the connecting hole 13 of the cutter holder 10. Accordingly, the first end surface 311 of the abutting block 31 abuts the lower surface 111 of the receiving hole 11. Consequently, a gap is formed between the insertion end of the assembly portion 21 of the cutting unit 20 and the second end surface 312 of the abutting block 31 of the hinge connector 30.

[0017] With reference to the Fig. 1 to 7, the engaging portion 33A of the hinge connector 30 in the first embodiment of the present invention has a hexagonal cross section. The contour of the engaging hole 23A of the cutting unit 20 corresponds in shape to the cross section of the engaging portion 33A to be hexagonal. As a result, the engaging portion 33A and the engaging hole 23A are engageable.

[0018] With reference to the Fig. 1 to 7, the nut 40 has an internal thread and a through hole 41. The nut 40 is screwed onto the mounting section 14. The mounting section 14 abuts the pressed end of the assembly section 21. The extension rod 22 and the two machining tools 27 protrude from the through hole 41 of the nut 40.

[0019] Compared with the conventional cutter holder assembly, the joint connector 30 of the present invention is fixed in the cutter holder 10 and has the engaging portion 33A with a polygonal cross section, and the assembly portion 21 of the cutting unit 20 has the engaging hole 23A with a polygonal contour. Due to the engagement between the engaging portion 33A and the engaging hole 23A, the cutter holder 10 and the cutting unit 20 cannot rotate relative to each other. Accordingly, the cutting unit 20 can withstand the reaction force from a machined workpiece. As a result, the cutter holder assembly improves the machining efficiency and the machining quality of the workpiece.

[0020] In addition, a liquid coolant is passed and flows through the communication hole 35 of the joint connector 30, the inlet channel 24, the communication channel 25 and the two inlet channels 26 to cool the two machining tools 27.

[0021] With reference to the Fig. 8 and Fig. 11, the second embodiment is similar to the first embodiment. The difference between the second and first embodiments is as follows: In the second embodiment, both the cross section of the engaging portion 33B of the hinge connector 30 and the contour of the engaging hole 23B of the cutting unit 20 are pentagonal, respectively. The engaging portion 33B and the engaging hole 23B can engage with each other to firmly connect the cutting unit 20 to the cutter holder 10 and ensure smooth and efficient machining in the process according to the present invention.

[0022] With reference to the Fig. 9 and Fig. 12, the third embodiment is similar to the first and second embodiments. The third embodiment differs from the first and second embodiments in the following: In the third embodiment, both the cross section of the engaging portion 33C of the hinge connector 30 and the contour of the engaging hole 23C of the cutting unit 20 are quadrilateral, respectively. The engaging portion 33C and the engaging hole 23C can also engage with each other. Smooth and efficient machining is also achieved by the present utility model.

[0023] Practically, as long as the engaging portion 33A, 33B, 33C and the engaging hole 23A, 23B, 23C can engage with each other, the cross section of the engaging portion 33A, 33B, 33C of the joint connector 30 and the contour of the engaging hole 23A, 23B, 23C of the cutting unit 20 are not limited.

[0024] In the first, second and third embodiments of the present utility model, each of the two machining tools 27 is a cutter for machining.

[0025] With reference to Fig. 10, the fourth embodiment is similar to the first embodiment. The difference between the fourth and first embodiments is as follows: In the fourth embodiment, the extension rod 22 of the cutting unit 20 is a tapered, thin rod and has a diameter that gradually decreases toward the machining end of the extension rod 22. Furthermore, one of the machining tools 27 mounted on the extension rod 22 is a drill.

[0026] Although the above description sets forth numerous features and advantages of the present utility model, as well as details of the structure and features of the utility model, the disclosure is merely exemplary. Changes may be made in detail, particularly with regard to the shape, size, and arrangement of parts, within the scope of the principles of the utility model, entirely within the scope permitted by the general spirit of the terms chosen to formulate the appended claims.

Claims

[1] A cutter holder assembly including: a cutter holder (10) comprising: two opposite ends; a receiving hole (11) positioned within the cutter holder (10) and having a lower surface (111); a conical hole (12) extending from one of the two ends of the cutter holder (10) to the receiving hole (11), communicating with the receiving hole (11) and having a diameter that gradually decreases toward the receiving hole (11); and a connecting hole (13) extending from the other of the two ends of the cutter holder (10) to the lower surface (111) of the receiving hole (11), communicating with the receiving hole (11) and having an internal thread; a cutting unit (20) comprising: an assembly section (21) which is conical and comprises: a pressed end; an insertion end located opposite the pressed end and inserted into the conical hole (12); a diameter that gradually decreases from the crimped end to the insertion end; an engagement hole (23A / 23B / 23C) extending from the insertion end to the pressed end and having a contour that is polygonal; an extension rod (22) extending from the pressed end and having a machining end extending from the assembly section (21); and at least one machining tool (27) mounted on the machining end; a joint connector (30) positioned within the cutter holder (10) and comprising: an abutting block (31) positioned within the receiving hole (11), being a block having a first end surface (311) and a second end surface (312) opposite each other, and having a diameter smaller than the diameter of the receiving hole (11); a connecting portion (32) positioned on the first end surface (311), having an external thread and screwed within the connecting hole (13); and an engaging portion (33A / 33B / 33C) positioned on the second end surface (312) and having a cross section that is polygonal, is inserted into the engaging hole (23A / 23B / 23C) and engages the engaging hole (23A / 23B / 23C); and a nut (40) connected to the cutter holder (10), abutting the pressed end and having a through hole (41), wherein the extension rod (22) and the at least one machining tool (27) protrude from the through hole (41). [2] Cutter holder assembly according to claim 1, wherein the joint connector (30) has two keyholes (34) positioned within the connecting portion (32) and the engaging portion (33A / 33B / 33C) respectively and extending along the connecting portion (32) and the engaging portion (33A / 33B / 33C) respectively; and each keyhole (34) has a polygonal contour. [3] Cutter holder assembly according to claim 2, wherein the contour of each of the two keyholes (34) is hexagonal. [4] Cutter holder assembly according to claim 3, wherein the cutting unit (20) comprises: an inlet channel (24) extending from a bottom of the engagement hole (23A / 23B / 23C) toward the machining end; a communication channel (25) which is in fluid communication with the inlet channel (24) and extends towards the processing end; two outlet channels (26) adjacent to the processing end and in fluid communication with the communication channel (25); and the joint connector (30) has a communication hole (35) positioned within the abutting block (31) and in fluid communication with the two keyholes (34). [5] Cutter holder assembly according to claim 4, wherein each of the at least one machining tool (27) is a cutter. [6] The cutter holder assembly according to claim 5, wherein the cutter holder (10) has a mounting portion (14) positioned at a same end of the cutter holder (10) with the tapered hole (12) and having an external thread; and the nut (40) has an internal thread and is screwed to the mounting portion (14). [7] The cutter holder assembly according to claim 1, wherein the extension rod (22) is a tapered thin rod and has a diameter that gradually decreases toward the machining end of the extension rod (22). [8] The cutter holder assembly according to any one of claims 1 to 7, wherein the cross section of the engaging portion (33A) is hexagonal; and the contour of the engaging hole (23A) corresponds to the cross section of the engaging portion (33A) and is hexagonal. [9] The cutter holder assembly according to any one of claims 1 to 7, wherein the cross section of the engaging portion (33B) is pentagonal; and the contour of the engaging hole (23B) corresponds to the cross section of the engaging portion (33B) and is pentagonal. [10] The cutter holder assembly according to any one of claims 1 to 7, wherein the cross section of the engaging portion (33C) is quadrilateral; and the contour of the engaging hole (23C) corresponds to the cross section of the engaging portion (33C) and is quadrilateral.

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