CN216989911U

CN216989911U - PCD (polycrystalline Diamond) forming cutter

Info

Publication number: CN216989911U
Application number: CN202122972324.XU
Authority: CN
Inventors: 邓艳楠
Original assignee: Shanghai Xima Ren Diamond Precision Tools Co ltd
Current assignee: Shanghai Xima Ren Diamond Precision Tools Co ltd
Priority date: 2021-11-30
Filing date: 2021-11-30
Publication date: 2022-07-19
Anticipated expiration: 2031-11-30

Abstract

The utility model relates to the technical field of precision machining tools, in particular to a PCD (polycrystalline Diamond) forming cutter for precision machining. In order to prolong the service life of the PCD forming cutter, the PCD forming cutter comprises a stepped cutter body and a cutter handle, wherein the stepped cutter body is positioned at the front end of the cutter handle and is connected with the cutter handle, a row cutting deflection angle is arranged between a guide surface of a row cutting groove on the stepped cutter body and the central axis of the stepped cutter body, and one end of the guide surface of the row cutting groove, which is close to the cutter handle, deviates from the central axis of the stepped cutter body. The PCD forming cutter increases the distance between the guide surface of the row cutting groove and the central axis of the stepped cutter body by arranging the row cutting deflection angle, thereby increasing the strength of the stepped cutter body, avoiding the stepped cutter body in the PCD forming cutter from being scrapped due to cracking, and prolonging the service life of the PCD forming cutter.

Description

PCD (polycrystalline Diamond) forming cutter

Technical Field

The utility model relates to the technical field of precision machining tools, in particular to a PCD (polycrystalline Diamond) forming cutter for precision machining.

Background

When the PCD shaping cutter shown in fig. 1 is used for precision machining, the stepped cutter body 02 of the PCD shaping cutter having the cutting insert 01 attached to the front end thereof is liable to crack, and the service life thereof is short.

SUMMERY OF THE UTILITY MODEL

In order to prolong the service life of the PCD cutter, the inventor has intensively studied and found that the stepped cutter body of the existing PCD cutter with the cutter blade mounted at the front end is easy to crack because of the following reasons: 1. an inner cooling hole is formed in the stepped cutter body at the front end of the existing PCD molding cutter, so that the strength of the stepped cutter body is reduced; 2. the row cutting groove of the ladder-shaped cutter body at the front end of the existing PCD forming cutter is thinner, and the strength of the ladder-shaped cutter body at the front end of the PCD forming cutter is further reduced. In order to solve the problem, the utility model provides a PCD molding cutter which comprises a stepped cutter body and a cutter handle, wherein the stepped cutter body is positioned at the front end of the cutter handle and connected with the cutter handle, a row cutting deflection angle is arranged between a guide surface of a row cutting groove on the stepped cutter body and the central axis of the stepped cutter body, and the guide surface of the row cutting groove deviates from the central axis of the stepped cutter body at one end close to the cutter handle. The PCD molding cutter increases the distance between the guide surface of the cutting groove and the central axis of the stepped cutter body by arranging the cutting deflection angle, further increases the strength of the stepped cutter body, avoids the stepped cutter body in the PCD molding cutter from being scrapped due to cracking, and prolongs the service life of the PCD molding cutter.

Preferably, the range of the row cutting deflection angle is 1.8-2.2 degrees. Therefore, the value of the row cutting deflection angle is limited to be 1.8-2.2 degrees, the row cutting capability of the row cutting groove can be ensured, the strength of the step cutter body can be increased, and the service life of the PCD molding cutter is prolonged. Further, the value of the row-cutting deflection angle is 2 degrees. Like this, will arrange and cut the declination and set up to 2, at the in-process of processing the ladder cutter body, especially when processing the guide surface of arranging the cutting groove, can guarantee that numerical control finish machining in later stage covers the rough machining of the plain grinding in earlier stage completely, improve machining efficiency and processing effect.

Preferably, the stepped cutter body is provided with two row cutting grooves, the two row cutting grooves are arranged on two sides of the central axis of the stepped cutter body in a centrosymmetric manner, and blades arranged on the stepped cutter body are symmetrically welded on two sides of the central axis of the stepped cutter body. Therefore, when the ladder knife body is used, the blades on the two sides of the ladder knife body are stressed in a balanced manner, and the ladder knife body can be prevented from cracking due to unbalanced stress in the using process.

Preferably, an internal cooling hole is formed in the PCD molding cutter, and the central axis of a main hole of the internal cooling hole is overlapped with the central axes of the stepped cutter body and the cutter handle; and the branch hole of the internal cooling hole is obliquely arranged on the side of the main hole and penetrates through the guide surface of the row cutting groove. Therefore, in the using process, the cooling liquid can be added through the inner cooling hole to cool the machined workpiece and the PCD molding cutter, and the machining efficiency is improved. Furthermore, the branch holes are arranged on two sides of the main hole in a staggered mode. Therefore, on the basis of ensuring the cooling effect, the strength of the stepped cutter body is improved, and the service life of the PCD molding cutter is further prolonged. Further preferably, one end of the main hole, which is located in the stepped cutter body and is far away from the cutter handle, is provided with a sealing section, and the sealing end of the sealing section is far away from a communication port between the branch hole close to the sealing section and the main hole. Therefore, the sealing section is arranged at one end, away from the cutter handle, of the main hole in the stepped cutter body, when the cooling liquid is injected, the injected cooling liquid can be buffered by the sealing section, the cooling liquid is prevented from flowing to a processing part quickly, the detention time of the cooling liquid in the PCD forming cutter is prolonged, and the cooling effect of the PCD forming cutter is improved.

Drawings

Fig. 1 is a schematic view of a prior art PCD forming cutter gazing structure;

FIG. 2 is a schematic structural view of a first embodiment of a PCD shaped cutter of the present invention;

FIG. 3 is a schematic front view of the sectional structure A-A in FIG. 2;

FIG. 4 is a schematic structural view of a second embodiment of a PCD shaped cutter of the present invention;

fig. 5 is a front view of the sectional structure of B-B in fig. 4.

Detailed Description

Next, a PCD-forming cutter according to the present invention will be described in detail with reference to fig. 2 to 5.

As shown in fig. 2 to 5, the PCD forming cutter of the present invention includes a stepped cutter body 1 and a shank 2, and the stepped cutter body 1 is located at a front end of the shank 2 and is connected to the shank 2. A row cutting offset angle α is provided between the guide surface 111 of the row cutting groove 11 in the stepped cutter body 1 and the central axis of the stepped cutter body 1, and the guide surface 111 of the row cutting groove 11 is offset from the central axis of the stepped cutter body 1 at the end closer to the holder 2. By setting the row cutting offset angle α, the PCD cutting tool increases the distance between the guide surface 111 of the row cutting groove 11 and the central axis of the stepped cutter body 1, thereby increasing the strength of the stepped cutter body 1, preventing the stepped cutter body 1 in the PCD cutting tool from being cracked and scrapped, and prolonging the service life of the PCD cutting tool of the present invention. Preferably, the range of the discharge cutting offset angle alpha is 1.8-2.2 degrees. Therefore, the value of the discharge cutting offset angle alpha is limited to be 1.8-2.2 degrees, so that the discharge cutting capability of the discharge cutting groove 11 can be ensured, the strength of the stepped cutter body 1 can be increased, and the service life of the PCD molding cutter is prolonged. Preferably, the value of the rejection offset angle a is 2 °. In this way, the row cutting offset angle α is set to 2 °, so that in the process of machining the stepped cutter body 1, especially when the guide surface 111 of the row cutting groove 11 is machined, the numerical control finish machining in the later stage can be ensured to completely cover the flat grinding rough machining in the earlier stage, and the machining efficiency and the machining effect are improved. Preferably, the stepped cutter body 1 is provided with two rows of cutting grooves 11, the two rows of cutting grooves 11 are arranged in a central symmetry manner on two sides of the central axis of the stepped cutter body 1, and the blades 3 arranged on the stepped cutter body 1 are symmetrically welded on two sides of the central axis of the stepped cutter body 1. Therefore, when the stepped knife body 1 is used, the blades 3 positioned at the two sides of the stepped knife body 1 are stressed in a balanced manner, so that the stepped knife body 1 can be prevented from cracking due to unbalanced stress in the using process.

As shown in fig. 2 to 5, the PCD shaping cutter of the present invention is provided with an inner cooling hole including a main hole 41 and a branch hole 42 which communicate with each other. The main hole 41 is located in the stepped cutter body 1 and the shank 2, and a central axis of the main hole 41 coincides with a central axis of the stepped cutter body 1 and a central axis of the shank 2. The branch hole 42 is provided obliquely to the side of the main hole 41, and one end of the branch hole 42 remote from the main hole 41 penetrates the guide surface 111 of the gang cutting groove 11. Therefore, in the using process, the cooling liquid can be added through the inner cooling hole to cool the machined workpiece and the PCD molding cutter, and the machining efficiency is improved. Preferably, the branch holes 42 are staggered on both sides of the main hole 41. Therefore, on the basis of ensuring the cooling effect, the strength of the stepped cutter body is improved, and the service life of the PCD molding cutter is further prolonged. Preferably, the end of the main hole 41, which is located in the stepped cutter body 1 and is far away from the cutter handle 2, is provided with a sealing section 411, and the sealing end of the sealing section 411 is far away from a communication port between the branch hole 42 close to the sealing section 411 and the main hole 41. Thus, the sealing section 411 is arranged at one end, away from the cutter handle 2, of the main hole 41 in the stepped cutter body 1, when the cooling liquid is injected, the injected cooling liquid can be buffered by the sealing section 411, the cooling liquid is prevented from rapidly flowing to a machining part, the residence time of the cooling liquid in the PCD molding cutter is prolonged, and the cooling effect of the PCD molding cutter is improved. In addition, in example 1, 10 support holes 42 were provided, in example 2, 6 support holes 42 were provided, and in the PCD shaped cutters of the same specification, too many support holes 42 were provided, which easily decreased the strength of the stepped cutter body 1 of the PCD shaped cutter, and affected the service life of the PCD shaped cutter.

Claims

1. The PCD forming cutter is characterized by comprising a stepped cutter body and a cutter handle, wherein the stepped cutter body is located at the front end of the cutter handle and connected with the cutter handle, a row cutting deflection angle is arranged between a guide surface of a row cutting groove in the stepped cutter body and the central axis of the stepped cutter body, and the guide surface of the row cutting groove is close to one end of the cutter handle and deviates from the central axis of the stepped cutter body.

2. A PCD forming cutter according to claim 1, characterised in that the row cutting deflection angle is in the range 1.8 ° to 2.2 °.

3. A PCD forming cutter according to claim 2, characterised in that the row cutting offset angle is 2 °.

4. A PCD shaped cutter according to any one of the claims 1 to 3, characterised in that the stepped cutter body is provided with two rows of cutting flutes arranged centrosymmetrically on either side of the central axis of the stepped cutter body, and the inserts provided on the stepped cutter body are welded symmetrically on either side of the central axis of the stepped cutter body.

5. A PCD forming cutter according to claim 4, wherein an internal cooling hole is formed in the PCD forming cutter, and the central axis of a main hole of the internal cooling hole coincides with the central axes of the stepped cutter body and the cutter handle; and the branch hole of the internal cooling hole is obliquely arranged on the side of the main hole and penetrates through the guide surface of the row cutting groove.

6. A PCD forming cutter according to claim 5, wherein the branch holes are staggered on either side of the main hole.

7. A PCD molding cutter according to claim 6, wherein the end of the main bore, which is located in the stepped cutter body and is remote from the handle, is provided with a sealing section, the sealing end of which is remote from the communication port between the branch bore close to the sealing section and the main bore.