CN219234179U

CN219234179U - Thread cutter

Info

Publication number: CN219234179U
Application number: CN202223128576.5U
Authority: CN
Inventors: 康梦利; 邢建军; 李和鑫
Original assignee: Funik Ultrahard Material Co Ltd
Current assignee: Funik Ultrahard Material Co Ltd
Priority date: 2022-11-24
Filing date: 2022-11-24
Publication date: 2023-06-23
Anticipated expiration: 2032-11-24

Abstract

The utility model provides a thread cutter, which comprises a cutter bar, a screw and a thread blade, wherein the front end of the cutter bar is provided with a cutter groove, the cutter groove is provided with a screw hole, a positioning groove is formed on the cutter groove around the screw hole, the bottom of the thread blade is provided with a positioning boss corresponding to the positioning groove, the positioning boss is attached to the positioning groove, the thread blade is locked at the cutter groove through the cooperation of the screw and the screw hole, the thread blade is made of CBN (cubic boron nitride) or ceramic or diamond, and the cutter bar is made of hard alloy. The thread cutter increases the holding force through the matching of the positioning groove and the positioning boss, so that shaking is avoided; the wear resistance is improved through material selection, the machining efficiency is improved, and the service life is prolonged.

Description

Thread cutter

Technical Field

The utility model relates to the technical field of machining tools, in particular to a thread cutter.

Background

In the machining process, materials such as titanium alloy, stainless steel, high-temperature alloy, hardening steel and the like are widely used in military industry and civil enterprises, and when the materials are machined, the problems of difficult chip breaking and chip removal, serious cutter sticking phenomenon, excessively rapid cutter abrasion and the like often occur.

The traditional thread processing method mainly adopts a thread turning tool to turn threads or adopts a tap and a die to manually tap and sleeve the threads. When processing difficult-to-process metal materials, taps often distort or clog the aperture due to excessive cutting forces, often resulting in tap chipping or breaking into the part. Taking out the tap is time-consuming and labor-consuming and can damage the parts; in addition, when a screw tap is used, a turning line is inevitably generated, which affects the processing accuracy, and in the case of a large-scale screw processing, it is very difficult to improve the processing efficiency because the screw tap is limited in a relatively low cutting speed and is reversely pushed after the screw thread is processed.

Screw tools commonly used in the market at present for processing difficult-to-process materials and hardening are divided into two types: firstly, an integral hard alloy thread milling cutter and secondly, a thread milling cutter provided with a hard alloy blade. Among them, the general one-piece cemented carbide thread milling cutter is of the following two types: the full-thread milling cutter and the single-pressure thread milling cutter have the main problems that the machining efficiency is low due to the adoption of the single-thread milling cutter, and the cutter-yielding phenomenon is serious due to the adoption of the full-thread milling cutter. The existing thread milling cutter with the hard alloy blade is adopted, the feeding speed of the milling cutter cannot be too high, because the blade is only fixed by pressing the screw, if the feeding speed is too high, the blade shakes back and forth under the action of resistance, the screw is easy to break, the screw and the blade are wasted, the cutter tip is broken, the service life of the cutter is influenced, and the cutter is wasted at a high speed when the service life is serious, so that personal injury safety accidents are caused. And because the currently used cutter is made of hard alloy, the thread cutter is easy to wear in the milling process, and the service life of the thread milling cutter is seriously influenced.

In summary, the drawbacks of the existing tools include: 1. due to the limitation of cutter materials, the service life of the existing cutter is low, and the precision cannot meet the machining requirement of precision parts; 2. the processing efficiency is low, the temperature of the cutter is possibly increased by improving the feeding, and the service life is seriously reduced; 3. the clamping force is insufficient, so that the workpiece is scrapped, and the cutter is broken; 4. the blade has poor wear resistance and low service life.

In order to solve the above problems, an ideal technical solution is always sought.

Disclosure of Invention

The utility model aims at overcoming the defects of the prior art, thereby providing the thread cutter with high hardness, good wear resistance, stable clamping, improved processing efficiency and longer service life.

In order to achieve the above purpose, the technical scheme adopted by the utility model is as follows: the utility model provides a threading tool, includes cutter arbor, screw and the whole polycrystalline structure's of carbide material screw blade, the front end of cutter arbor is provided with the sword groove, be provided with the screw on the sword groove, be provided with positioning groove around the screw on the sword groove, screw blade's bottom corresponds positioning groove is provided with the location boss, location boss and positioning groove laminating, screw blade passes through the cooperation locking of screw and screw sword groove department.

The thread blade is made of CBN or ceramic or diamond.

The model of the cutter bar is YG8.

The positioning groove is at least two grooves with conical cross sections and distributed around the screw hole at equal angles.

The edge of the thread blade is provided with thread teeth.

The included angle between two adjacent thread teeth is 50-80 degrees.

The screw is characterized in that the cutter bar is a reducing cutter bar with a thin front end and a thick rear end, the thread teeth of the thread blade extend out of the peripheral surface of the front end of the cutter bar, and the highest position of the screw is lower than the highest position of the cutter groove.

Based on the above, the shape of the screw thread blade is trapezoid, and the shape of the knife groove is trapezoid matched with the screw thread blade.

Compared with the prior art, the utility model has substantial characteristics and progress, and in particular has the following advantages:

1. the positioning grooves are formed in the surfaces of the cutter grooves, the matched positioning protrusions are arranged on the threaded blades, the degree of freedom of the blades can be effectively limited through matching of the positioning grooves and the positioning protrusions, the clamping force of the blades is enhanced through matching of the screws, and the conditions that in use, the blades are poor in workpiece precision and easy to wear due to shaking are avoided.

2. Because the assembled structure is adopted, the blade can adopt an integral polycrystalline structure, the problem of material limitation of the cutter is solved, precise parts can be processed, and the processing efficiency can be improved; and the wear resistance of the thread cutter is good, so that the service life can be prolonged while the processing quality is ensured.

3. The positions of the positioning grooves are distributed around the screw holes in equal angles, and the positioning grooves are matched with the trapezoid structure of the cutter groove, so that the freedom degree of the rotation direction of the threaded blade can be effectively limited, the stability is improved, and the machining precision is further guaranteed.

Drawings

Fig. 1 is a schematic view of the overall structure of the thread tool according to the present utility model.

Fig. 2 is an exploded view of the thread tool of the present utility model.

Fig. 3 is a schematic view of the structure of the screw blade according to the present utility model.

In the figure: 1. a cutter bar; 2. a screw; 3. a screw thread blade; 4. a thread tooth; 5. a positioning groove; 6. a knife slot; 7. positioning the bulge; 8. screw holes.

Detailed Description

The technical scheme of the utility model is further described in detail through the following specific embodiments.

As shown in fig. 1-3, a thread cutter comprises a cutter bar 1 made of hard alloy, a screw 2 and a thread blade 3 with an integral polycrystalline structure.

The cutter bar 1 is made of YG8 hard alloy, is designed into a reducing cutter bar with a thin front end and a thick rear end, the cutter groove 6 is formed in the front end of the cutter bar 1, and the whole shape of the cutter groove 6 is trapezoid with a small inside and a large outside.

The cutter groove 6 is provided with a screw hole 8, 4 positioning grooves 5 are formed around the screw hole 8, and the cross section of each positioning groove 5 is conical.

The whole shape of screw blade 3 is trapezoidal with sword groove 6 shape fit, is provided with the mounting hole that corresponds screw 8 on for pass screw 2, the bottom of screw blade 3 corresponds positioning groove 5 and is provided with location protruding 7, and location protruding 7 and positioning groove 5 laminating play the purpose of restriction screw blade 3 degree of freedom.

The outer end edge of the thread blade 3 is provided with the thread teeth 4, the included angle between the thread teeth is controlled to be 50-80 degrees, and is usually 60 degrees, so that a workpiece can be better processed, and the thread teeth of the thread blade extend out of the outer peripheral surface of the front end of the cutter bar.

The thread blade 3 is made of CBN or ceramic or diamond, has high-quality wear resistance, ensures the surface quality of a workpiece, can prolong the service life of a thread cutter, and effectively improves the machining efficiency.

The screw blade 3 is locked at the pocket 6 by the cooperation of the screw 2 and the screw hole 8, and the highest position of the screw 2 is lower than the highest position of the pocket 6.

The screw blade 3 is shaped in the following way:

1. synthesizing an integral polycrystalline blank (PCBN) under the conditions of high temperature and high pressure;

2. selecting a proper cutter body blank, machining a step shape, and forming a cutter groove and a threaded hole;

3. grinding the thickness of the blade by using a surface grinder;

4. and engraving a boss structure on the back of the screw thread blade by using laser engraving equipment.

5. The shape of the thread teeth is processed by laser.

The finally obtained thread blade 3 has high hardness, high wear resistance and higher finish of the processing surface due to the improvement of the material quality, and the working efficiency and the service life are greatly improved.

The tool formed after being assembled with the tool bar 1 avoids a series of problems of the traditional hard alloy tool, and lays a foundation for improving the performance of the threaded tool.

Finally, it should be noted that the above-mentioned embodiments are only for illustrating the technical scheme of the present utility model and are not limiting; while the utility model has been described in detail with reference to the preferred embodiments, those skilled in the art will appreciate that: modifications may be made to the specific embodiments of the present utility model or equivalents may be substituted for part of the technical features thereof; without departing from the spirit of the utility model, it is intended to cover the scope of the utility model as claimed.

Claims

1. A thread tool, characterized in that: the cutter bar, the screw and the thread blade of whole polycrystalline structure including carbide material, the front end of cutter bar is provided with the sword groove, be provided with the screw on the sword groove, be provided with positioning groove around the screw on the sword groove, the bottom of thread blade corresponds positioning groove is provided with the location boss, location boss and positioning groove laminating, thread blade passes through the cooperation locking of screw and is in sword groove department.

2. The thread tool according to claim 1, wherein: the thread blade is made of CBN or ceramic or diamond.

3. The thread tool according to claim 2, wherein: the model of the cutter bar is YG8.

4. A thread tool according to any one of claims 1-3, wherein: the positioning groove is at least two grooves with conical cross sections and distributed around the screw hole in an equal angle mode.

5. The thread tool as recited in claim 4, wherein: the edge of the thread blade is provided with thread teeth.

6. The thread tool as recited in claim 5, wherein: the included angle between two adjacent thread teeth is 50-80 degrees.

7. The thread tool as recited in claim 6, wherein: the cutter bar is a reducing cutter bar with a thin front end and a thick rear end, the thread teeth of the thread blade exceed the outer peripheral surface of the front end of the cutter bar, and the highest position of the screw is lower than the highest position of the cutter groove.

8. The thread tool according to claim 7, wherein: the shape of the thread blade is trapezoid, and the shape of the cutter groove is trapezoid matched with the thread blade.