CN110587470B

CN110587470B - Clamp

Info

Publication number: CN110587470B
Application number: CN201910875965.8A
Authority: CN
Inventors: 张太全; 刘超; 文晓; 冯炎建; 郑建平; 郑文庆; 张守全
Original assignee: Xiamen Tungsten Co Ltd; Xiamen Golden Egret Special Alloy Co Ltd
Current assignee: Xiamen Tungsten Co Ltd; Xiamen Golden Egret Special Alloy Co Ltd
Priority date: 2019-04-09
Filing date: 2019-09-17
Publication date: 2023-07-04
Anticipated expiration: 2039-09-17
Also published as: CN110587470A

Abstract

The invention discloses a clamp, which comprises a body, wherein the body is detachably arranged on a millstone of grinding equipment, the millstone is circular, and the millstone is provided with a clampThe body comprises at least 3 clamping grooves which are distributed in a central symmetry manner, the center is positioned at the geometric gravity center of the body, and the maximum circumscribed circle diameter D which is circumscribed with the clamping grooves meets the requirement

Description

Clamp

Technical Field

The invention relates to the technical field of machining, in particular to a clamp.

Background

In the superhard materials industry, polycrystalline diamond (PCD) compacts and Polycrystalline Cubic Boron Nitride (PCBN) compacts have developed very rapidly in recent years with the development of the heavy industries such as aerospace, heavy machinery, petroleum and natural gas, coal mining, automobiles, and electricity. These composite sheets are typically composed of two parts in the thickness direction: one layer is a hard alloy substrate, the other layer is a super-hard polycrystalline layer, and the two layers are sintered together by an ultra-high pressure and high temperature method to form a composite sheet. The PCD composite sheet can be widely used for petroleum and natural gas and coal exploitation drill bits to cutting tools and the like, the size (mainly the diameter) of the composite sheet is more and more, and the diameter is different from tens of millimeters to hundreds of millimeters. And the surface of the polycrystalline layer of the composite sheet is subjected to mirror polishing and is a qualified product.

In general, the polishing and polishing process is to make the surface of the polycrystalline layer of the composite sheet contact with the surface of the grinding disc under proper pressure, and the composite sheet and the grinding disc simultaneously rotate circumferentially along a horizontal plane and mutually perform opposite polishing, so that the effect of polishing and polishing the polycrystalline layer is achieved. 2-4 clamping grinding heads are symmetrically distributed on the grinding disc surface of the grinding device at intervals, namely 2-4 composite sheets can be polished at one time. Because the diameter specification range of the composite sheet product is larger, the size of the grinding disc and the auxiliary clamp need to be correspondingly adjusted. However, at present, no precise design is performed on the size of the grinding disc and the auxiliary clamp, and the basic condition is that the grinding disc model (the ring width of most parts is 35 mm) of the grinding equipment is uniformly adopted for the composite sheet of any specification, so that the polishing process is adjusted anyway, the polishing effect of the composite sheet is not ideal, the flatness of the polishing surface is poor, or the polishing efficiency is low. Meanwhile, when the size of the composite sheet is far smaller than the width of the grinding disc ring, the grinding disc is possibly inconsistent in internal and external abrasion after a period of grinding, so that the grinding disc needs to be replaced, and great waste is caused.

Disclosure of Invention

In view of the above, the invention provides a clamp which solves the contradiction between the polishing quality and the polishing efficiency of a small-sized composite sheet, fully considers the running stability, the clamping stability and the safety of equipment, greatly reduces the polishing cost and greatly improves the polishing efficiency.

In order to achieve the above purpose, the invention adopts the following technical scheme:

the utility model provides a fixture, the fixture can be dismantled and set up on grinding disc of grinding equipment, the fixture includes the body, the mill is the ring shape, upper surface or lower surface of body include 3 at least centre gripping grooves, centre gripping groove is central symmetry and distributes, the center is located the geometric center of gravity of body, with the equal external maximum circumscribed circle diameter D of centre gripping groove satisfies D= 2b/k, b is the ring width of mill, k is 0.85-0.9.

In actual grinding and polishing, the composite sheet can do micro radial movement on the grinding disc surface besides autorotation, so that the purpose is to uniformly consume the grinding disc everywhere, but the radial movement cannot be too large, otherwise, the stability of the polishing process is affected.

According to the actual consumption condition of the grinding disc, the invention finds that when the clamping groove meets the above relation, the grinding disc utilization rate can be maximized, the running stability of the grinding process is balanced, and meanwhile, the size of radial movement of the composite sheet on the grinding disc is combined, and k is 0.85-0.9. K may be increased appropriately when the radial movement is slightly larger; and vice versa.

The grinding disc comprises a body and at least 3 clamping grooves, wherein the clamping grooves are distributed in a central symmetry manner, the center is positioned at the geometric gravity center of the body, and because the clamping grooves are symmetrically arranged, when the composite sheet is arranged in the corresponding clamping groove, no polycrystalline layer exists in the middle of the body and can be ground, the contact area of the composite sheet and the grinding disc is basically consistent at any time, so that the surface consumption of the grinding disc is even compared with that of a single sheet, the number of times of grinding disc trimming is greatly reduced, and the flatness of the polished surface of the composite sheet is also greatly improved.

The numerical ranges disclosed herein include all point values of that range.

Drawings

FIG. 1 is a top view of the clamp of the present invention;

fig. 2 is a cross-sectional view of the single clamping groove of the clamp of the invention after clamping a workpiece to be processed.

The marks in the figure: 1-a body; 2-clamping grooves; 3-limiting screws; 4-a composite sheet to be processed; 5-a cemented carbide substrate of the composite sheet; 6-polycrystalline layers of compacts.

Detailed Description

In order to make the above objects, features and advantages of the present invention more comprehensible, the present invention is described in detail below with reference to the accompanying drawings, but the scope of the present invention is not limited to the following examples, in which experimental methods without specific conditions are not specified, and generally according to conventional conditions.

In a preferred embodiment, the thickness of the body is 10mm-15mm. The thinner the total thickness of the clamp is, the better the clamp can be clamped on the equipment and the strength is enough. If the height of the clamp is too high, a large amount of heat generated during grinding and polishing cannot be quickly conducted to the grinding head of the grinding equipment, and the grinding head is cooled by circulating cooling water, so that the cooling effect of the system is reduced, and the grinding disc surface and the composite sheet surface are easily burned by the grinding and polishing heat.

In a preferred embodiment, the spacing between the clamping grooves is 1mm or more. The clamping groove can be ensured to have enough strength, and the problem of stability caused by mutual interference among the compound sheets when the grinding equipment operates is avoided.

In a preferred embodiment, the depth is less than 0.01mm in error.

In the recommended implementation mode, the clamping groove is formed by 3 circular groove bodies with the same diameter, and the circle center connecting line of the circular groove bodies forms an equilateral triangle.

In a preferred embodiment, the body is made of cast steel having a hardness HRC > 50. The material of the body is not particularly limited, but the use of cast steel with high hardness is more advantageous for processing superhard materials.

In a preferred embodiment, the cross-sectional shape of the clamping groove corresponds to the shape of the workpiece to be machined.

In a recommended embodiment, the fixture further comprises a limit screw arranged at the side edge of the clamping groove, and when the workpiece to be processed is placed in the clamping groove, the limit screw is in radial contact with the workpiece to be processed from the side edge of the clamping groove so as to fix the workpiece to be processed.

In a preferred embodiment, the depth of the clamping groove is 0.5mm-1mm lower than the thickness of the workpiece to be machined.

Example 1

Please refer to fig. 1, a fixture comprises a body 1, the thickness of the body is 15mm, the fixture is made of hard alloy, the body 1 comprises 3 circular clamping grooves 2, the spacing between the clamping grooves 2 is 1mm, the clamping grooves 2 are distributed in a central symmetry manner, and the center is positioned in the geometry of the body 1The center of gravity, the connecting line of the centers of the 3 clamping grooves 2 form an equilateral triangle, and the maximum circumcircle diameter D circumscribed with the 3 clamping grooves 2 meets

b, taking the ring width 35mm of the grinding disc of the grinding device, and k taking 0.90, namely, D is 55mm.

The clamp further comprises a limit screw 3 arranged at the side edge of the clamping groove 5.

Fig. 2 is a cross-sectional view of a single clamping groove of the clamp and a workpiece to be processed after clamping, the cross-sectional shapes of the composite sheet 4 to be processed and the clamping groove 2 are consistent, the depth of the clamping groove 2 is 1mm lower than the thickness of the composite sheet 4 to be processed, and the error of the depth of the clamping groove 2 is 0.01mm.

The specific grinding and polishing steps are as follows: the composite sheet 4 to be processed is placed in the clamping groove 2, the limit screw 3 is contacted with the hard alloy substrate 5 of the composite sheet 4 to be processed from the side edge of the clamping groove 2 to fix the composite sheet 4 to be processed, and the clamp fixed with the composite sheet 4 to be processed is fixed on the millstone of the grinding equipment, so that the polycrystalline layer 6 of the composite sheet 4 to be processed faces downwards. And then starting the grinding equipment, wherein the equipment can stably and safely run without worrying about shifting or flying out of the composite sheet in high-speed running.

In the invention, the workpiece to be processed is a composite sheet, but the workpiece to be processed is not limited to the composite sheet, and can be other workpieces needing to be ground and polished.

The above embodiments are only for explaining the technical solution provided by the present invention, but not limiting the present invention, and any simple modification, equivalent variation and modification made to the above embodiments according to the technical substance of the present invention falls within the protection scope of the technical solution of the present invention.

Claims

1. The utility model provides a fixture, the fixture can dismantle the mill that sets up at grinding equipment, the fixture includes the body, the mill is ring-shaped, its characterized in that: the body adopts hardnessThe HRC is more than or equal to 50, the upper surface or the lower surface of the body comprises at least 3 clamping grooves, the clamping grooves are used for accommodating workpieces to be processed, the clamping grooves are distributed in a central symmetry manner, the center is positioned at the geometric gravity center of the body, and the maximum circumscribed circular diameter D which is circumscribed with the clamping grooves meets the following condition

And b is the ring width of the grinding disc, and k is 0.85-0.9.

2. A clamp as claimed in claim 1, wherein: the thickness of the body is 10mm-15mm.

3. A clamp as claimed in claim 1, wherein: the spacing between the clamping grooves is more than 1mm.

4. A clamp as claimed in claim 1, wherein: the depth of the clamping groove is 0.5mm-1mm lower than the thickness of the workpiece to be processed.

5. A clamp as defined in claim 4, wherein: the error of the depth is less than 0.01mm.

6. A clamp as claimed in claim 1, wherein: the clamping groove is formed by 3 circular groove bodies with the same diameter, and the circle center connecting line of the circular groove bodies forms an equilateral triangle.

7. A clamp as claimed in claim 1, wherein: the cross section shape of the clamping groove is consistent with the shape of the workpiece to be processed.

8. A clamp according to any one of claims 1-7, characterized in that: the clamp further comprises a limit screw arranged on the side edge of the clamping groove, when the workpiece to be machined is placed in the clamping groove, the limit screw is in radial contact with the workpiece to be machined from the side edge of the clamping groove so as to fix the workpiece to be machined.