CN220761280U - Internal cooling Shan Ya thread milling cutter and cutter - Google Patents

Abstract

The utility model belongs to the technical field of machining and cutting, and discloses an internal cooling Shan Ya thread milling cutter and a cutter. The internal cooling Shan Ya thread milling cutter comprises a cutter bar, a cutter neck and a cutter head, wherein one end of the cutter neck is connected with the cutter bar, a cooling main channel is arranged in the cutter bar and the cutter neck in a penetrating way, the cutter head is arranged at the other end of the cutter neck, a plurality of chip grooves are formed in the cutter head, cooling diversion holes communicated with the cooling main channel are formed in each chip groove in a penetrating way, and at least two cutting edges are arranged on the cutter head and used for repairing a thread inclined plane and a thread width of a workpiece. According to the utility model, through the cooling main channel and the cooling diversion holes, the coolant can be precisely sprayed at multiple points on the cutting part, the cooling of the product is accelerated, and at least two cutting edges are arranged on the tool bit, so that the thread inclined plane and the thread tooth width of the workpiece can be repaired, the qualification rate is improved, and the production cost is reduced.

Description

Internal cooling Shan Ya thread milling cutter and cutter

Technical Field

The utility model relates to the technical field of machining and cutting, in particular to an internal cooling Shan Ya thread milling cutter and a cutter.

Background

Most pedicle screws are machined by a single process of a slitter, and the characteristic machining of trapezoidal threads in pedicle screws is the greatest in terms of wear on the threading tool and the thread plug gauge, and therefore about 10% -20% of each batch of products are off-specification. And under the condition that the thread plug gauge is used for many times until the abrasion is serious, if an operator does not find the thread plug gauge in time, the whole batch of products are unqualified, and then the thread plug gauge is scrapped, resources are wasted, and the operation cost is increased.

Specifically, the failure of the thread plug gauge is basically caused by the out-of-tolerance of the pitch diameter of the thread, and the critical dimension affecting the pitch diameter of the thread is the tooth width. The problem that the common thread with the major diameter within phi 12 is smaller in pitch diameter at present is often directly repaired by the screw tap return wire matched, and no proper mode is currently adopted for repairing the common thread with the major diameter above phi 12. Furthermore, the thread plug gauge with the trapezoid threads and the large diameter more than phi 12 adopts a special trapezoid tap for thread width repair, the effect is poor, two parts are roughly repaired, the trapezoid tap is worn, the surface of the repaired product is particularly rough, and the use requirement of the product cannot be met. Therefore, how to guarantee that the repairing tool can accurately and efficiently repair the plug gauge workpiece with the trapezoidal threads, reduce the rejection rate of products which cannot be repaired due to abrasion of the cutter or the threaded plug gauge, improve the qualification rate of the products and reduce the production cost is a problem which needs to be solved by the personnel in the field.

Disclosure of Invention

The utility model aims to provide an internal cooling Shan Ya thread milling cutter and a cutter, so as to accurately and efficiently repair a plug gauge workpiece with trapezoidal threads, reduce the rejection rate of products which cannot be repaired due to abrasion of the cutter or a thread plug gauge, improve the product qualification rate and reduce the production cost.

To achieve the purpose, the utility model adopts the following technical scheme:

an internally cooled Shan Ya thread milling cutter, comprising:

a cutter bar;

a cutter neck, one end of the cutter neck is connected with the cutter bar, and a cooling main channel is arranged in the cutter bar and the cutter neck in a penetrating way;

the tool bit, this tool bit sets up in the other end of this sword neck, is provided with a plurality of chip groove on this tool bit, all runs through on every chip groove to be provided with the cooling water diversion hole that communicates in this cooling main channel, and is provided with two cutting edges on this tool bit at least for reprocess the screw thread inclined plane and the screw thread tooth width of work piece.

Optionally, the tool bit includes a tool bit body and cutting edges, and a plurality of the cutting edges are uniformly disposed along a circumferential direction of the tool bit body for reworking the workpiece.

Optionally, a cutting bottom edge is provided on the cutting edge for reworking the thread bevel.

Alternatively, wherein the inclination angle of the cutting bottom edge bevel is the same as the inclination angle of the thread bevel.

Optionally, the cutting edge is provided with a cutting side edge for repairing the thread width of the workpiece.

Alternatively, wherein the height of the cutting side edge is smaller than the thread width of the workpiece, and the difference therebetween ranges from 0.15mm to 0.2mm.

Alternatively, wherein the turning diameter of the cutting side edge is larger than the outside diameter of the insert neck, the difference therebetween is larger than a value obtained by adding 1mm to twice the thread height of the workpiece.

Optionally, a clearance groove is further provided on the tool bit, and the clearance groove is located between the cutting edge and the tool neck.

Alternatively, the inner diameter of the clearance groove is smaller than the diameter of the outer side of the tool neck, and the difference between the two is 0.2mm.

On the other hand, the cutter comprises the internal cooling Shan Ya thread milling cutter and a cutter handle, wherein the internal cooling Shan Ya thread milling cutter is detachably connected with the cutter handle, a driving system and a cooling long hole are arranged in the cutter handle, the driving system can drive the internal cooling Shan Ya thread milling cutter to rotate, and the cooling long hole is communicated with the cooling main channel.

The utility model has the beneficial effects that:

according to the utility model, the cooling main channels are arranged in the cutter bar and the cutter neck in a penetrating way, so that a circulation channel is provided for coolant, furthermore, the chip groove is arranged on the cutter head, and the cooling diversion holes communicated with the cooling main channels are arranged on the chip groove in a penetrating way, so that the coolant can be sprayed into the chip groove through the cooling main channels through the cooling diversion holes, and therefore, when the internal cooling Shan Ya thread milling cutter works, the coolant can be precisely sprayed to the cutting part, multi-point cooling is performed, the cooling of a workpiece is accelerated, and the influence of overheating of a product on the repairing effect is avoided. Specifically, the small burrs and accumulated scraps generated during thread repairing can be accumulated in the chip removal groove, and can be timely flushed away under the flushing action of the coolant so as to reduce the abrasion to the milling cutter, thereby ensuring the accuracy of repairing. Optionally, at least two cutting edges are arranged on the tool bit to repair the thread inclined plane and the thread width of the workpiece, so that the number of the scrapped workpieces due to abrasion of the tool or the thread plug gauge is reduced, the qualification rate of products is improved, the rejection rate is reduced, and the production cost is reduced. On the other hand, the tool with the internally cooled Shan Ya thread milling cutter also has the effect of accurately and efficiently repairing the workpiece with the trapezoidal threads.

Drawings

FIG. 1 is a schematic view of a cutter according to an embodiment of the present utility model;

FIG. 2 is a schematic side view of a tool according to an embodiment of the utility model;

FIG. 3 is a schematic view of an internally cooled Shan Ya thread milling cutter according to an embodiment of the present utility model;

FIG. 4 is a schematic side view of one end of an internally cooled Shan Ya thread milling cutter according to an embodiment of the present utility model;

FIG. 5 is a schematic side view of the other end of an internally cooled Shan Ya thread milling cutter according to an embodiment of the present utility model;

FIG. 6 is a schematic cross-sectional view of an internally cooled Shan Ya thread milling cutter according to an embodiment of the present utility model;

FIG. 7 is a first isometric view of a tool bit in an internally cooled Shan Ya thread milling cutter according to an embodiment of the present utility model;

FIG. 8 is a second isometric view of a cutting head in an internally cooled Shan Ya thread milling cutter according to an embodiment of the present utility model;

fig. 9 is a schematic view of a structure of a thread in a workpiece according to an embodiment of the utility model.

In the figure:

100-internal cooling Shan Ya thread milling cutter; 200-knife handle; 201-cooling long holes;

10-a cutter bar; 20-knife neck; 30-cutter head; 101-cooling the main channel;

31-a cutter head body; 311—the bottom surface of the cutter head;

32-knife edges; 321-blade sides; 322-cutting bottom edge; 323-cutting side edge;

301-cooling tap holes; 302-chip removal groove; 303-an empty-avoiding groove;

300-workpiece; 310-thread inclines; 320-top thread surface; 330-threaded lower bottom surface.

Detailed Description

Embodiments of the present utility model are described in detail below, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to like or similar parts throughout, or parts having like or similar functions. The embodiments described below by referring to the drawings are illustrative and intended to explain the present utility model and should not be construed as limiting the utility model.

In the description of the present utility model, unless explicitly stated and limited otherwise, the terms "connected," "connected," and "fixed" are to be interpreted broadly, as for example, they may be fixedly connected, or may be detachably connected, or may be electrically connected, or may be directly connected, or may be indirectly connected through an intermediary, or may be in communication with one another in two elements or in an interaction relationship between two elements. The specific meaning of the above terms in the present utility model can be understood by those of ordinary skill in the art according to the specific circumstances.

In the description of the present utility model, unless explicitly stated and limited otherwise, a first feature "above" or "below" a second feature may include the first feature and the second feature being in direct contact, or may include the first feature and the second feature not being in direct contact but being in contact by another feature therebetween. Moreover, a first feature being "above," "over" and "on" a second feature includes the first feature being directly above and obliquely above the second feature, or simply indicating that the first feature is higher in level than the second feature. The first feature being "under", "below" and "beneath" the second feature includes the first feature being directly under and obliquely below the second feature, or simply means that the first feature is less level than the second feature.

Most pedicle screws are machined by a single process of a slitter, and the characteristic machining of trapezoidal threads in pedicle screws is the greatest in terms of wear on the threading tool and the thread plug gauge, and therefore about 10% -20% of each batch of products are off-specification. And under the condition that the thread plug gauge is used for many times until the abrasion is serious, if an operator does not find the thread plug gauge in time, the whole batch of products are unqualified, and then the thread plug gauge is scrapped, resources are wasted, and the operation cost is increased.

Specifically, the failure of the thread plug gauge is basically caused by the out-of-tolerance of the pitch diameter of the thread, and the critical dimension affecting the pitch diameter of the thread is the tooth width. The problem that the common thread with the major diameter within phi 12 is smaller in pitch diameter at present is often directly repaired by the screw tap return wire matched, and no proper mode is currently adopted for repairing the common thread with the major diameter above phi 12. Furthermore, the thread plug gauge with the trapezoid threads and the large diameter more than phi 12 adopts a special trapezoid tap for thread width repair, the effect is poor, two parts are roughly repaired, the trapezoid tap is worn, the surface of the repaired product is particularly rough, and the use requirement of the product cannot be met. Therefore, how to guarantee that the repairing tool can accurately and efficiently repair the plug gauge workpiece with the trapezoidal threads, reduce the rejection rate of products which cannot be repaired due to abrasion of the cutter or the threaded plug gauge, improve the qualification rate of the products and reduce the production cost is a problem which needs to be solved by the personnel in the field.

The technical solution of the present embodiment is further described below by way of specific embodiments with reference to the accompanying drawings.

As shown in fig. 1-9, this embodiment provides an internal cooling Shan Ya thread milling cutter, which comprises a cutter bar 10, a cutter neck 20 and a cutter head 30, wherein one end of the cutter neck 20 is connected to the cutter bar 10, a cooling main channel 101 is arranged in the cutter bar 10 and the cutter neck 20 in a penetrating way, the cutter head 30 is arranged at the other end of the cutter neck 20, a plurality of chip grooves 302 are arranged on the cutter head 30, cooling diversion holes 301 communicated with the cooling main channel 101 are arranged on each chip groove 302 in a penetrating way, and at least two cutting edges are arranged on the cutter head 30 and are used for repairing a thread inclined plane 310 and a thread width of a workpiece 300.

On the other hand, the tool comprises an internal cooling Shan Ya thread milling cutter and a tool shank 200, wherein the internal cooling Shan Ya thread milling cutter is detachably connected to the tool shank 200, a driving system and a cooling long hole are arranged in the tool shank 200, the driving system can drive the internal cooling Shan Ya thread milling cutter to rotate, and the cooling long hole 201 is communicated with the cooling main channel 101.

Specifically, in this embodiment, the cooling main channel 101 is disposed through the cutter bar 10 and the cutter neck 20, so as to provide a circulation channel for the coolant, further, the chip groove 302 is disposed on the cutter head 30, and the cooling tap hole 301 communicated with the cooling main channel 101 is disposed through the chip groove 302, so that the coolant can be sprayed into the chip groove 302 through the cooling tap hole 301 through the cooling main channel 101, and when the internal cooling Shan Ya thread milling cutter performs operation, the coolant can be precisely sprayed to the cutting part, and multi-point cooling is performed, so that the cooling of the workpiece 300 is accelerated, and the influence of the product overheating on the repairing effect is avoided. Specifically, small burrs and accumulated scraps generated during thread repairing can be accumulated in the chip removal groove 302, and can be timely flushed away under the flushing action of the coolant so as to reduce abrasion to the milling cutter, thereby ensuring the accuracy of repairing. Optionally, at least two cutting edges are disposed on the tool bit 30 to repair the thread inclined surface 310 and the thread width of the workpiece 300, so as to reduce the number of the workpieces 300 scrapped due to abrasion of the tool or the thread plug gauge, improve the qualification rate of the product, reduce the rejection rate, and reduce the production cost. On the other hand, the tool with the internally cooled Shan Ya thread milling cutter also has the effect of accurately and efficiently repairing the workpiece with the trapezoidal threads.

The specific structure of the internally cooled Shan Ya thread milling cutter in this embodiment will be described below.

As shown in fig. 3 to 9, the internally cooled Shan Ya thread milling cutter in this embodiment comprises a cutter bar 10, a cutter neck 20 and a cutter head 30. Alternatively, the tool neck 20 is disposed between the tool bar 10 and the tool bit 30, and one end of the tool neck 20 is connected to the tool bar 10, and the other end of the tool neck 20 is connected to the tool bit 30, which are integrally formed in this embodiment, and may be connected by welding in other embodiments.

As shown in conjunction with fig. 3 and 6, specifically, the cutter bar 10 and the cutter neck 20 are each provided in a cylindrical structure, and a cooling main passage 101 is provided therethrough. Illustratively, the cooling main channel 101 is provided in a cylindrical structure, and the center line thereof is located on the axes of the cutter bar 10 and the cutter neck 20, whereby the coolant enters at the inlet of the cooling main channel 101 through the end of the cutter bar 10 away from the cutter neck 20, and passes through the cutter bar 10 and the cutter neck 20 and reaches the outlet of the cooling main channel 101. As shown in fig. 3-6, optionally, a plurality of cooling diversion holes 301 are provided on the tool bit 30, and each cooling diversion hole 301 is communicated with the cooling main channel 101, that is, one end of the cooling diversion hole 301 is communicated with an outlet of the cooling main channel 101, and the other end is communicated with the outer side of the tool bit 30, so that a coolant can be introduced into the cooling diversion hole 301 in the cooling main channel 101 and finally sprayed onto the workpiece 300 at the outer side of the tool bit 30, thereby realizing cooling in the operation process and avoiding influence on cutting effect caused by overheating of the workpiece 300 and the internal cooling Shan Ya thread milling cutter.

As shown in fig. 7 and 8 in detail, the tool bit 30 includes a tool bit body 31 and a cutting edge 32, and a tool bit bottom surface 311 is provided on the tool bit body 31, the cutting edge 32 includes a cutting bottom edge 322 and a cutting side edge 323, and the cutting edge 32 is provided with a cutting edge side surface 321. Further, the cooling tap hole 301 is disposed on the blade 32, and the blade 32 is further provided with a plurality of junk slots 302 and empty avoiding slots 303.

As shown in fig. 3 and 5, in this embodiment, a plurality of chip grooves 302 are disposed on the tool bit 30, and each chip groove 302 is provided with a cooling tap hole 301 in a penetrating manner, that is, the cooling tap holes 301 are disposed in a one-to-one correspondence with the chip grooves 302, so that when the cutting operation is performed, the workpiece 300 can be cooled in time by the coolant sprayed out through the cooling tap holes 301, and small burrs and chips generated when the threads are reworked in the chip grooves 302 can be washed away, so that abrasion to the milling cutter itself is reduced, and accuracy of reworking is further ensured.

Optionally, a plurality of cutting edges 32 are uniformly disposed along the circumferential direction of the tool bit body 31 for reworking of the work piece 300. Specifically, the cutting edges 32 are provided in four, and the four cutting edges 32 are arranged at intervals in the circumferential direction of the bit body 31 to ensure the reworking quality thereof. Alternatively, the tool bit body 31 and the cutting edge 32 are provided as a unitary structure in this embodiment, and may be connected by welding in other embodiments. Specifically, the plane of the side of the tool bit body 31 away from the tool neck 20 is set as a tool bit bottom surface 311, in this embodiment, four cutting edges 32 are disposed at an angle to the tool bit bottom surface 311, and the cutting edges 32 are disposed in a trapezoid structure.

As shown in fig. 7 and 8, the edge side surface 321 is disposed at an angle to the head bottom surface 311, and the cutting bottom edge 322 and the cutting side edge 323 are disposed on the adjacent sides of the edge side surface 321, respectively. Specifically, the tool bit 30 is provided with at least two cutting edges, in this embodiment a cutting bottom edge 322 and a cutting side edge 323, respectively, for reworking the thread slope 310 and thread width of the workpiece 300. Alternatively, the cutting bottom edge 322 is connected to the edge side surface 321, and to the head bottom surface 311, and is connected to the cutting side edge 323 on the side opposite to the side where the head bottom surface 311 is connected. Illustratively, in this embodiment, the cutting surface of the cutting bottom edge 322 is a square surface and forms an included angle with the bottom surface 311 and the side surface 321 of the cutting head, so as to repair the thread inclined surface 310 of the workpiece 300.

Optionally, the bevel of the cutting bottom edge 322, i.e., the cutting face thereof, is inclined at the same angle as the thread bevel 310 to ensure that the parameters after the reconditioning thereof meet the requirements of the workpiece 300. Optionally, the cutting side edge 323 is configured as a square structure, connected to the cutting bottom edge 322 and disposed at an angle thereto for repairing the thread width of the workpiece 300. Illustratively, the cutting side edge 323 is perpendicular to the cutting bottom edge 322, the height of the cutting side edge 323 is smaller than the thread width of the workpiece 300, the difference between the cutting side edge 323 and the cutting bottom edge is in the range of 0.15mm-0.2mm, the rotation diameter of the cutting side edge 323 is larger than the outer diameter of the tool neck 20, and the difference between the cutting side edge 323 and the cutting side edge is larger than the sum of twice the thread height of the workpiece 300 and 1mm, so that smoothness and accuracy of repairing operation of the workpiece are ensured, and motion interference is avoided. Further, each blade is provided with a thickness that varies. Illustratively, each blade gradually increases in thickness in a direction from one end of the blade side 321 away from the cutting side edge 323 to secure cutting strength.

Further, one junk slot 302 is provided between every two blades 32, so that four junk slots 302 are provided in this embodiment, and correspondingly, four cooling tap holes 301 are also provided to form multi-point cooling, so as to improve the cooling effect. As shown in fig. 8, the chip groove 302 is configured as an L-shaped groove, thereby providing a platform for small burrs and chips during the repair work, and being separated from the chip groove 302 by the flushing of the coolant ejected from the cooling tap hole 301, thereby avoiding the abrasion of the workpiece 300.

As shown in conjunction with fig. 7 and 8, in particular, the clearance groove 303 is located between the cutting edge and the insert neck 20, that is, the clearance groove 303 of an annular structure is provided between both the cutting bottom edge 322, the cutting side edge 323, and the insert neck 20. Optionally, the clearance groove 303 is connected to the junk slot 302 and is separated into four parts by the junk slot 302 to avoid motion interference or damage to the workpiece 300 during operation of the tool bit 30. Illustratively, the inside diameter of the clearance groove 303 is smaller than the outside diameter of the throat 20, and the difference between the two is 0.2mm.

As shown in fig. 9, the work 300 is provided with a thread slope 310, a thread upper top surface 320, and a thread lower bottom surface 330. Specifically, the cutting face of the cutting bottom edge 322 is inclined at the same angle as the thread inclines 310 to ensure the quality requirements of the thread inclines 310 in the workpiece 300. Further, the distance between the upper thread surface 320 and the center line of the workpiece 300 is a small thread diameter, the width of the lower thread surface 330 is a thread width, and the height of the cutting side edge 323 is adapted to the width of the lower thread surface 330. Optionally, the spacing between the thread upper surface 320 and the thread lower surface 330 is thread height, and the turning diameter of the cutting side edge 323 is matched with the value of the thread height, which is not described herein.

The structure of the cutter in this embodiment will be specifically described below.

As shown in fig. 1 and 2, the tool includes an internal cooling Shan Ya thread milling cutter 100 and a tool shank 200, the internal cooling Shan Ya thread milling cutter 100 is detachably connected to the tool shank 200, a driving system and a cooling slot 201 are provided in the tool shank 200, the driving system can drive the internal cooling Shan Ya thread milling cutter to rotate, and the cooling slot 201 is communicated with the cooling main channel 101, so that smooth introduction of coolant is ensured, and smooth implementation of repair operation of the internal cooling Shan Ya thread milling cutter 100 is ensured.

Referring to fig. 3 to 9, the method for using the cutter comprises: firstly, mounting a tool shank 200 on a main shaft of a machine tool; then starting the machine tool to enable the main shaft to rotate positively and drive the tool shank 200 to rotate synchronously with the main shaft, so that the internal cooling Shan Ya thread milling cutter 100 rotates positively synchronously with the main shaft; next, a coolant is introduced from the cooling elongated hole 201, so that the coolant is sprayed onto the working surface of the workpiece 300 through the cooling elongated hole 201, the cooling main passage 101 and the cooling diversion hole 301 to effect cooling; then, the cutting bottom edge 322 is just contacted with the thread inclined plane 310 by adjusting the cutter length compensation value, and the cutting side edge 323 is just contacted with the thread lower bottom surface 330 by adjusting the cutter radius compensation value, so that the descending height of each circle can be ensured to be consistent with the thread pitch of the workpiece 300 in the spiral milling repairing mode; finally, the tool length compensation value is continuously modified, so that the cutting bottom edge 322 continuously performs cutting processing on the thread inclined surface 310 until the quality of the workpiece 300 meets the requirement.

Specifically, the cost of the internal cooling Shan Ya thread milling cutter 100 in the embodiment is 1/4 of that of a trapezoidal special screw tap, and the internal cooling Shan Ya thread milling cutter 100 in the embodiment can better control the dimension of the tooth width by adjusting the cutter compensation value, so that the repaired workpiece 300 is stable in dimension, the surface roughness of the repaired workpiece can reach Ra0.8, and the drawing requirement is met. Further, in this embodiment, the repair efficiency of the internal cold Shan Ya thread milling cutter 100 is about three times that of the trapezoidal special tap, so that the production cost can be effectively reduced.

It is to be understood that the above examples of the present utility model are provided for clarity of illustration only and are not limiting of the embodiments of the present utility model. Other variations or modifications of the above teachings will be apparent to those of ordinary skill in the art. It is not necessary here nor is it exhaustive of all embodiments. Any modification, equivalent replacement, improvement, etc. which come within the spirit and principles of the utility model are desired to be protected by the following claims.

Claims (10)

1. Internally cooled Shan Ya thread milling cutter, characterized by comprising:

a cutter bar (10);

a cutter neck (20), wherein one end of the cutter neck (20) is connected with the cutter bar (10), and a cooling main channel (101) is arranged in the cutter bar (10) and the cutter neck (20) in a penetrating way;

tool bit (30), tool bit (30) set up in the other end of sword neck (20), be provided with a plurality of chip groove (302) on tool bit (30), every all run through on chip groove (302) be provided with on cooling main channel (101) cooling branch stream hole (301), just be provided with two cutting edges on tool bit (30) at least, be used for reprocessing screw thread inclined plane (310) and the screw thread tooth width of work piece (300).

2. The internal cooling Shan Ya thread milling cutter according to claim 1, wherein the tool bit (30) comprises a bit body (31) and cutting edges (32), and a plurality of the cutting edges (32) are uniformly arranged along the circumference of the bit body (31) for repair of the workpiece (300).

3. The internally cooled Shan Ya thread milling cutter according to claim 2, wherein the cutting edge (32) is provided with a cutting bottom edge (322) for reconditioning the thread chamfer (310).

4. An internal cooling Shan Ya thread milling cutter according to claim 3, characterized in that the inclination angle of the cutting bottom edge (322) bevel is the same as the inclination angle of the thread bevel (310).

5. The internally cooled Shan Ya thread milling cutter according to claim 2, wherein the cutting edge (32) is provided with a cutting side edge (323) for reworking the thread width of the workpiece (300).

6. The internal cooling Shan Ya thread milling cutter according to claim 5, wherein the cutting side edge (323) has a height less than the thread width of the workpiece (300) and a difference therebetween ranges from 0.15mm to 0.2mm.

7. The internal cooling Shan Ya thread milling cutter according to claim 5, wherein the turning diameter of the cutting side edge (323) is greater than the outside diameter of the insert neck (20) by a difference greater than the sum of twice the thread height of the workpiece (300) and 1 mm.

8. The internal cold Shan Ya thread milling cutter according to any one of claims 1 to 7, wherein the cutting head (30) is further provided with a clearance groove (303), said clearance groove (303) being located between the cutting edge and the insert neck (20).

9. The internal cooling Shan Ya thread milling cutter according to claim 8, wherein the inside diameter of the clearance groove (303) is smaller than the outside diameter of the insert neck (20) by a difference of 0.2mm.

10. The tool is characterized by comprising the internal cooling Shan Ya thread milling cutter and a tool holder (200) according to any one of claims 1-9, wherein the internal cooling Shan Ya thread milling cutter is detachably connected to the tool holder (200), a driving system and a cooling long hole (201) are arranged in the tool holder (200), the driving system can drive the internal cooling Shan Ya thread milling cutter to rotate, and the cooling long hole (201) is communicated with the cooling main channel (101).