阅读说明：本技术 一种用于无磁性薄壁垫圈类零件的平磨方法与平磨夹具 (Flat grinding method and flat grinding clamp for nonmagnetic thin-wall washer parts ) 是由 杨浩 周欢 朱建文 于 2021-08-20 设计创作，主要内容包括：本发明提供了一种用于无磁性薄壁垫圈类零件的平磨方法与平磨夹具,包括：内撑块,其上部形成有用于承载待加工工件的圆形台阶部；至少两个圆弧形外挡块,其高度与内撑块的高度相同,并合围成圆环状围挡将所述待加工工件及内撑块的外圆挡住；圆弧形外挡块与待加工工件的外圆表面贴合设置；圆弧形外挡块与内撑块的外圆表面之间留有间隙。本发明采用分开设置的内撑块和多个圆弧形外挡块,先通过内撑块对待加工工件的内圆面和底面进行定位承载,再通过多个圆弧形外挡块对待加工工件的外圆面进行定位并将工件固定,整个装夹过程简单快捷,工件装夹稳定可靠,保证零件不变形,解决薄壁垫圈类工件固定不稳定可靠从而导致的工件平行度不合格的问题。(The invention provides a flat grinding method and a flat grinding clamp for nonmagnetic thin-wall washer parts, which comprise the following steps: the upper part of the inner supporting block is provided with a circular step part for bearing a workpiece to be processed; the height of the at least two arc-shaped outer stop blocks is the same as that of the inner supporting block, and the two arc-shaped outer stop blocks are encircled into a circular ring-shaped enclosure to block the workpiece to be processed and the excircle of the inner supporting block; the arc-shaped outer stop block is attached to the outer circle surface of the workpiece to be processed; a gap is reserved between the circular arc-shaped outer stop block and the outer circle surface of the inner supporting block. The invention adopts the inner supporting block and the plurality of arc-shaped outer stopping blocks which are separately arranged, the inner circular surface and the bottom surface of the workpiece to be processed are positioned and supported through the inner supporting block, and then the outer circular surface of the workpiece to be processed is positioned and fixed through the plurality of arc-shaped outer stopping blocks.)

1. A flat grinding method for nonmagnetic thin-wall gasket parts is characterized by comprising the following steps of:

fixing the nonmagnetic thin-wall gasket part on a magnetic table by using an inner supporting block and an outer stop block, wherein the inner supporting block and the outer stop block are made of magnetic materials and are tightly attracted by the magnetic table, the inner supporting block is attached to the inner circle surface, and the outer stop block is attached to the outer circle surface;

grinding at least one of the two opposing side surfaces.

2. The flat grinding method according to claim 1, wherein a step is formed at an upper portion of the inner supporting block, the step has a vertical step surface and a horizontal step surface, the vertical step surface is attached to the inner circular surface, and one of the two side surfaces of the nonmagnetic thin-walled gasket-like component is carried by the horizontal step surface.

3. A flat grinding fixture for nonmagnetic thin-wall washer parts is characterized by comprising:

the upper part of the inner supporting block is provided with a circular step part for bearing a workpiece to be processed;

the height of the at least two arc-shaped outer stop blocks is the same as that of the inner supporting block, and the two arc-shaped outer stop blocks are encircled into a circular ring-shaped enclosure block to block the workpiece to be processed and the excircle of the inner supporting block;

the arc-shaped outer stop block is attached to the outer circle surface of the workpiece to be processed;

and a gap is reserved between the circular arc-shaped outer stop block and the outer circle surface of the inner supporting block.

4. The flat grinding fixture for the nonmagnetic thin-walled gasket-like parts as claimed in claim 3, wherein the heights of the circular arc-shaped outer stop block and the circular arc-shaped inner support block are smaller than the height of the workpiece to be machined after being placed on the circular step part.

5. The flat grinding fixture for the nonmagnetic thin-walled gasket-like part as claimed in claim 3, wherein the vertical step surface of the circular step part is closely attached to the inner circular surface of the workpiece to be processed.

6. The flat grinding fixture for the nonmagnetic thin-walled gasket-like parts as claimed in claim 3, wherein the inner supporting block and the circular arc-shaped outer stop block are made of magnetic materials and are arranged on a magnetic table of the grinding machine in a suction manner;

and fixing the workpiece to be processed in the circular step part by magnetic adsorption between two adjacent circular outer stop blocks and magnetic adsorption between the inner supporting block and the circular outer stop blocks.

7. The flat grinding fixture for the nonmagnetic thin-walled gasket-like parts as claimed in claim 3, wherein the inner supporting block and the circular arc-shaped outer stop block are provided with vertical positioning through holes, and the inner supporting block and the circular arc-shaped outer stop block are fixed on a horizontal plane in a threaded connection manner by passing through the vertical positioning through holes through bolts.

8. The flat grinding fixture for nonmagnetic thin-walled gasket-like parts as claimed in claim 3, wherein the bottom surface of the inner supporting block is arranged in parallel with the horizontal step surface of the circular step.

9. The flat grinding fixture for nonmagnetic thin-walled gasket-like parts according to claim 3, wherein the inner supporting block and the circular arc-shaped outer stop block are fixed on a horizontal plane by any one of plug-in connection, buckle connection, hook-type connection and adhesive connection.

Technical Field

The invention relates to the technical field of machining, in particular to a flat grinding method and a flat grinding clamp for nonmagnetic thin-wall washer parts.

Background

In the grinding process, when abrasive particles contact with a workpiece and enter a cutting stage, the abrasive particles are cut to reach a certain depth, after a normal grinding force is increased to a certain degree, the grinding part of the workpiece reaches a certain temperature, and part of material slides along a shearing surface to form chips and flows out along the front cutter face of the abrasive particles, so that thermal stress and deformation stress are generated on the surface of the workpiece, and in addition, stress caused by phase change can also be generated on the material.

The thin workpieces such as gaskets are poor in surface flatness before grinding, and are easy to be deformed by heat and stress during grinding, and the influence of elastic deformation generated by stress on the workpieces is reduced from the aspects of process and clamping except that the grinding conditions are improved by adopting measures such as a soft grinding wheel, a small grinding depth, a high feeding speed and sufficient grinding fluid.

At present, for non-magnetic thin-wall gasket type parts, a magnetic table of a grinding machine cannot suck the workpiece tightly when the workpiece is ground, and an auxiliary clamp is required to be additionally arranged to fix the parts on the magnetic table. As shown in fig. 1 and 2, in the conventional scheme, two semicircular stoppers 1 made of magnetic materials are used for blocking the outer circle of a workpiece 2, so as to fix the workpiece 2, and the workpiece is ground on the basis. However, in actual machining, there is a problem that the roughness of the ground surface of the workpiece and the parallelism of both surfaces of the workpiece are difficult to satisfy.

Disclosure of Invention

In view of the above-mentioned shortcomings of the prior art, it is a primary object of the present invention to provide a flat grinding method and a flat grinding jig for a nonmagnetic thin-walled washer-like part, which can easily satisfy the machining accuracy of a workpiece.

The invention provides a flat grinding method for nonmagnetic thin-wall gasket parts, wherein the nonmagnetic thin-wall gasket parts are annular and are provided with an outer circle surface, an inner circle surface and two opposite side surfaces, and the flat grinding method comprises the following steps:

fixing the nonmagnetic thin-wall gasket part on a magnetic table by using an inner supporting block and an outer stop block, wherein the inner supporting block and the outer stop block are made of magnetic materials and are tightly attracted by the magnetic table, the inner supporting block is attached to the inner circle surface, and the outer stop block is attached to the outer circle surface;

grinding at least one of the two opposing side surfaces. The grinding can be carried out using a grinding wheel, but also other grinding tools can be used.

Compared with the mode in fig. 1, the flat grinding method of the invention has the advantages that not only the outer circular surface but also the inner circular surface of the washer part are supported during grinding, so that the whole supported area of the part is increased, and the support stability of the part is improved, therefore, the processing precision such as the roughness of the side surface and the parallelism of the two side surfaces can be easily ensured.

Optionally, the flat grinding fixture may include at least two outer stoppers, the at least two outer stoppers surround to form a circular ring-shaped enclosure to block the nonmagnetic thin-wall gasket-like part, and a gap is left between the adjacent outer stoppers.

Thus, for example, when one annular outer stopper is used, a gap is prevented from being generated between the outer stopper and the outer circumferential surface of the component, and the outer stopper is satisfactorily bonded to the outer circumferential surface of the nonmagnetic thin-walled gasket component, thereby improving the support stability of the nonmagnetic thin-walled gasket component.

Optionally, a step is formed on the upper portion of the inner supporting block, the step has a vertical step surface and a horizontal step surface, the vertical step surface is attached to the inner circular surface, and one of the two side surfaces of the nonmagnetic thin-wall gasket-like part is borne by the horizontal step surface.

Compared with the situation that only one cylindrical inner supporting block is used for supporting the part, the method can increase the volume of the inner supporting block and the contact area of the inner supporting block and the magnetic table, increase the suction force and further improve the supporting stability of the part.

In addition, in the method, the flat grinding clamp has a simple and compact structure, so that the clamp cost is saved, the workpiece is stably and reliably clamped, and the part is ensured not to deform. By adopting the method, the problems of unqualified parallelism of the workpiece and scrapping of the workpiece caused by binding the cutter due to unstable and reliable fixation of the thin-wall washer workpiece can be solved.

The invention provides a flat grinding clamp for nonmagnetic thin-wall washer parts, which comprises: the upper part of the inner supporting block is provided with a circular step part for bearing a workpiece to be processed; the height of the at least two arc-shaped outer stop blocks is the same as that of the inner supporting block, and the two arc-shaped outer stop blocks are encircled into a circular ring-shaped enclosure block to block the workpiece to be processed and the excircle of the inner supporting block; the arc-shaped outer stop block is attached to the outer circle surface of the workpiece to be processed; and a gap is reserved between the circular arc-shaped outer stop block and the outer circle surface of the inner supporting block.

By last, adopt separately the interior kicking block and the outer dog of a plurality of circular arcs that set up, treat the interior disc and the bottom surface of processing the work piece through interior kicking block earlier and fix a position and bear, the outer disc of treating the processing work piece of rethread a plurality of circular arc outer dogs is fixed a position and is fixed the work piece, whole clamping process is simple swift, work efficiency is high, the work piece clamping is reliable and stable.

Optionally, the heights of the arc-shaped outer stop block and the inner support block are smaller than the height of the workpiece to be machined after the workpiece is placed on the circular step part.

By the above, the height of the workpiece to be machined after being placed on the circular step part of the inner supporting block is ensured to be larger than the height of the circular arc-shaped outer stop block and the height of the inner supporting block, and the surface of the workpiece is not affected to be ground.

Optionally, the vertical step surface of the circular step portion is closely attached to the inner circular surface of the workpiece to be processed.

By last, can be fixed with the interior disc of treating the processing work piece through the vertical step face of circular step portion to press from both sides the work piece tightly, prevent that the hole of work piece from not having stable fixed point, make the equal holding of work piece hole excircle, increased the contact surface between work piece and the dog, the wriggling in the twinkling of an eye of work piece when reducing the grit cutting work piece.

Optionally, the inner supporting block and the arc-shaped outer stop block are made of magnetic materials and are tightly arranged on a magnetic table of the grinding machine; and fixing the workpiece to be processed in the circular step part by magnetic adsorption between two adjacent circular outer stop blocks and magnetic adsorption between the inner supporting block and the circular outer stop blocks.

By the above, the workpiece to be processed is fixed through the magnetic action between the inner supporting block and the arc-shaped outer stop block, so that the clamp is simple and compact in structure, high in clamping efficiency, low in clamp cost and stable and reliable in workpiece clamping.

Optionally, the inner supporting block and the arc-shaped outer stop block are provided with vertical positioning through holes, and the inner supporting block and the arc-shaped outer stop block are fixed on a horizontal plane in a threaded connection mode through bolts penetrating through the vertical positioning through holes.

Therefore, the inner supporting block and the circular arc-shaped outer stop block are fixed in a threaded connection mode, and a workpiece to be processed is fixed between the inner supporting block and the circular arc-shaped outer stop block, so that the grinding work can be carried out without operating on a magnetic table of a grinding machine, and the application range of the flat grinding clamp is expanded.

Optionally, the bottom surface of the inner supporting block is parallel to the horizontal step surface of the circular step portion.

Therefore, the grinding device is beneficial to clamping and grinding the surface of the workpiece to be processed so as to ensure the parallelism requirement of the workpiece to be processed.

Optionally, the inner supporting block and the arc-shaped outer stop block are fixed on the horizontal plane by any one of plug-in connection, buckle connection, hook connection and paste connection.

By last, realize the firm connection of interior kicking block and convex outer dog through simple connection structure, do benefit to the structure and the dismouting process of simplifying the flat grinding anchor clamps, make things convenient for connection and separation between the two.

Drawings

FIG. 1 is a schematic structural view illustrating a fixing structure for a non-magnetic thin-wall gasket type part in the prior art;

FIG. 2 is a cross-sectional view of FIG. 1;

FIG. 3 is a schematic structural diagram of a flat grinding fixture for nonmagnetic thin-walled gasket parts according to the present invention;

fig. 4 is a cross-sectional view of fig. 3.

Detailed Description

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein is for the purpose of describing embodiments of the present application only and is not intended to be limiting of the application.

The invention provides a flat grinding method for nonmagnetic thin-wall gasket parts, wherein the nonmagnetic thin-wall gasket parts can also be called nonmagnetic thin-wall annular parts, are annular and are provided with an outer circular surface, an inner circular surface and two opposite side surfaces. The method of the invention comprises the following steps:

A. fixing a nonmagnetic thin-wall gasket part (or a workpiece to be processed) on a magnetic table by using a flat grinding fixture, wherein the flat grinding fixture comprises an inner supporting block and an outer stop block, the inner supporting block and the outer stop block are made of magnetic materials and are tightly absorbed by the magnetic table, the inner supporting block is attached to the inner circle surface, and the outer stop block is attached to the outer circle surface;

B. grinding at least one of the two opposing side surfaces.

Compared with the mode in fig. 1, the flat grinding method of the invention has the advantages that during grinding, the outer circle surface of the gasket part is supported (the outer stop block is attached to the outer circle surface), and the inner circle surface of the gasket part is also supported (the inner support block is attached to the inner circle surface), so that the supported area of the whole part is increased, and the supporting stability of the part is improved, therefore, the processing precision such as the roughness of the side surface and the parallelism of the two side surfaces can be easily ensured.

Optionally, the flat grinding fixture may include at least two outer stoppers, the at least two outer stoppers surround to form a circular ring-shaped enclosure to block the nonmagnetic thin-wall gasket-like parts, and a gap is left between adjacent outer stoppers.

Thus, for example, when a circular outer stopper is used, a gap is prevented from being generated between the outer stopper and the outer circumferential surface of the part, so that the outer stopper is more favorably attached to the outer circumference of the nonmagnetic thin-walled gasket part, and the support stability of the nonmagnetic thin-walled gasket part is improved.

An example of the flat grinding jig used in the flat grinding method of the present invention will be described below, and a specific embodiment of the present invention will be further described with reference to the description of the flat grinding jig. It should be noted that the flat grinding jig described in detail below is merely an example of the flat grinding jig used in the flat grinding method of the present invention, and the method of the present invention is not limited to the use of the flat grinding jig, and any type of jig capable of supporting the outer circumferential surface and the inner circumferential surface of the part may be used.

An example of a flat grinding jig for nonmagnetic thin-walled washer-like parts according to the present invention will be described in detail with reference to fig. 3 to 4. The flat grinding fixture aims at workpieces to be processed of nonmagnetic thin-wall gasket parts.

The flat grinding clamp for the nonmagnetic thin-wall gasket parts comprises an inner supporting block 10 and at least two arc-shaped outer stop blocks 20 which are arranged separately, wherein a circular step part 11 used for bearing a workpiece 30 to be processed is formed in the upper part of the inner supporting block 10, the at least two arc-shaped outer stop blocks 20 can be enclosed to form an annular enclosure, the inner supporting block 10 and the workpiece 30 to be processed positioned on the upper part of the inner supporting block are placed in the inner space of the annular enclosure, and the annular enclosure blocks the workpiece 30 to be processed and the excircle of the inner supporting block 10 so as to fix the workpiece 30 to be processed.

The curvature radius of the inner circumferential surface of the circular arc-shaped outer stop block 20 is the same as that of the outer circumferential surface of the workpiece 30 to be machined, the curvature radius of the outer circumferential surface of the inner supporting block 10 is smaller than that of the inner circumferential surface of the circular arc-shaped outer stop block 20, the circular arc-shaped outer stop block 20 is attached to the outer circumferential surface of the workpiece 30 to be machined through the arrangement of the curvature radii, a certain gap is reserved between the circular arc-shaped outer stop block 20 and the outer circumferential surface of the inner supporting block 10, and thus, radial force of a circular ring-shaped enclosure formed by the circular arc-shaped outer stop blocks 20 can be completely applied to the workpiece 30 to be machined, and the workpiece 30 to be machined is clamped and fixed.

In addition, the height of each circular arc-shaped outer stop block 20 is consistent with that of the inner support block 10 and is smaller than the height of the workpiece 30 to be machined after being placed on the circular step part 11, so that the surface of the workpiece 30 to be machined can be conveniently ground.

In order to further prevent the workpiece 30 to be machined from being stressed unevenly during grinding and from generating instant creep locally, the vertical step surface of the circular step part 11 is closely attached to the inner circular surface of the workpiece 30 to be machined, that is, the workpiece 30 to be machined is assembled on the circular step part 11 of the inner support block 10, the gap between the two is zero, and the transition fit or the interference fit is performed, so that the contact area of the whole workpiece with the inner support block 10 and the circular arc-shaped outer stop block 20 can be increased. In addition, the bottom surface of the inner support block 10 is parallel to the horizontal step surface of the circular step portion 11, so as to ensure the parallelism requirement of the workpiece to be processed (the horizontal step surface and the bottom surface of the inner support block 10 are separated between the workpiece to be processed and the magnetic table). When the workpiece is ground, the grinding tool applies a downward force to the workpiece 30 to be processed, so that the bottom surface of the workpiece 30 to be processed is closely attached to the horizontal step surface of the circular step 11, and the workpiece 30 to be processed is more stably fixed in the circular step 11 without moving.

With the inner support block 10, compared with the case where the inner support block is formed as only one cylindrical body, the volume of the inner support block and the contact area with the magnetic table can be increased, the suction force of the magnetic table to the inner support block can be increased, and the support stability of the component can be further improved.

The inner supporting block 10 and the circular arc-shaped outer stop blocks 20 are made of magnetic materials and are tightly sucked and arranged on a magnetic table of the grinding machine, and a workpiece 30 to be processed can be fixed in the circular step part 11 through magnetic adsorption between two adjacent circular arc-shaped outer stop blocks 20 and magnetic adsorption between the inner supporting block 10 and the circular arc-shaped outer stop blocks 20. Of course, the inner supporting block 10 and the circular arc outer stop blocks 20 are not limited to be fixed by magnetic force, and corresponding vertical positioning through holes may be formed in the inner supporting block 10 and the circular arc outer stop blocks 20, and after the inner supporting block 10, each circular arc outer stop block 20 and the workpiece 30 to be machined are assembled, the inner supporting block 10 and the circular arc outer stop blocks 20 are fixed on a horizontal plane in a threaded manner by passing through the vertical positioning through holes through bolts. It is understood that the inner supporting block 10 and the circular arc outer stop block 20 can be fixed on the horizontal plane by any one of plug-in connection, buckle connection, hook connection and adhesive connection. No matter which kind of connected mode is adopted, all will guarantee that interior kicking block 10 and circular arc outer dog 20 are fixed the back, and circular arc outer dog 20 sets up with the excircle surface laminating of waiting to process work piece 30, and leaves certain clearance between the excircle surface of circular arc outer dog 20 and interior kicking block 10 to guarantee to wait to process work piece 30 reliable and stable fixed including in the circular step portion 11 of kicking block 10.

When the processing fixture is used, a workpiece 30 to be processed is positioned and clamped on the circular step part 11 of the inner supporting block 10, the workpiece and the excircle of the inner supporting block are blocked by at least two circular arc-shaped outer stopping blocks 20 with equal heights, wherein a circular ring-shaped enclosure which can be synthesized by the circular arc-shaped outer stopping blocks 20 is attached to the workpiece, a certain gap is reserved between the circular ring-shaped enclosure and the inner supporting block 10, and the workpiece is ensured to be fixed stably and reliably to form a whole.

The flat grinding fixture for grinding the nonmagnetic thin-wall gasket parts is assembled by adopting the inner supporting block 10 and the circular-arc-shaped outer stop block 20 which are separately arranged, the outer circle of the inner hole of the workpiece is fixed by the stop blocks, the contact surface between the workpiece and the stop blocks is increased, and the instant creep of the workpiece when the workpiece is cut by abrasive particles is reduced. In addition, the inner hole of the workpiece is filled and clamped through the inner supporting block 10, so that the rear half part (the part which is subjected to tool cutting after the workpiece is cut) of the workpiece is supported, stress deformation caused by tool cutting is reduced, uniform grinding is guaranteed, the whole assembly and disassembly are simple and rapid, the working efficiency is high, the roughness and the parallelism of the grinding surface of the workpiece can well meet the requirements, and the product quality can be guaranteed.

The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.