CN109822171B

CN109822171B - Electric spark wire cutting clamp

Info

Publication number: CN109822171B
Application number: CN201811610120.8A
Authority: CN
Inventors: 邢波; 闫宁; 韩欣
Original assignee: Zhengzhou Research Institute for Abrasives and Grinding Co Ltd
Current assignee: Zhengzhou Research Institute for Abrasives and Grinding Co Ltd
Priority date: 2016-08-31
Filing date: 2016-08-31
Publication date: 2020-10-23
Anticipated expiration: 2036-08-31
Also published as: CN106238843B; CN106238843A; CN109822171A

Abstract

The invention relates to the technical field of machining, in particular to a wire cut electrical discharge machining clamp. The workpiece pressing and fixing device comprises a base and a separating device used for separating more than two workpieces on the base in a layered mode, wherein the separating device is matched with a pressing device used for pressing and fixing the workpieces on the base, the base comprises a base plate, and the part, matched with the separating device, of the base is arranged on the base plate. When the device is used for clamping workpieces, a plurality of workpieces can be clamped simultaneously, and intervals are reserved between the workpieces, so that the cutting precision during cutting can be ensured under the condition of improving the cutting efficiency.

Description

Electric spark wire cutting clamp

The application is a divisional application of the following applications, the application date of the original application: 2016, 8/31, original application No.: 2016107663673, title of original application: an electric spark wire cutting clamp.

Technical Field

The invention relates to the technical field of machining, in particular to a wire cut electrical discharge machining clamp.

Background

At present, electric spark cutting is widely used for machining workpieces, particularly for cutting and machining hard metals, and the electric spark wire cutting machining is to melt and oxidize local metals of the workpieces to be corroded by using instantaneous high temperature of discharge between an electrode wire and the workpieces, and corroded materials are drained by electrolyte after being condensed to realize cutting. In wire electrical discharge machining of a plate-shaped workpiece into a plurality of parts, the workpiece is usually clamped in a base fixed with a cutting device, a clamping groove is arranged on one side of the base and used for clamping the workpiece, and a single-piece cutting mode is usually adopted to ensure the cutting precision and the machining quality of the surface of the workpiece. In this case, on the one hand, the portion of the workpiece clamped in the base cannot be effectively utilized, which results in waste of raw materials, and on the other hand, only one workpiece is processed at a time, which results in low processing efficiency of the whole cutting machine.

In order to improve the processing efficiency of the cutting machine, a plurality of workpieces are directly overlapped together and cut simultaneously in the existing cutting operation, so that the cutting efficiency is improved, but a new problem can occur, firstly, the problem that the part of the workpiece clamped in the base cannot be effectively utilized is still not solved, secondly, a plurality of workpieces are directly overlapped, the continuous cutting thickness is increased, namely, the cutting depth of the workpiece is increased, the staying time of the molten scraps in the cutting seam of the workpiece is prolonged, the molten scraps are not easy to discharge, the cutting path is influenced, and the further cutting is hindered. The cutting precision of the shape of the cut part is difficult to guarantee, and especially the shape precision of the straight-edge transition part is poor. Meanwhile, the surface processing quality of the workpiece is reduced.

Disclosure of Invention

The invention aims to provide a wire cut electric discharge machine clamp which improves cutting efficiency on the basis of ensuring cutting precision.

In order to achieve the aim, the invention discloses a technical scheme of a wire cut electric discharge machine clamp, which comprises the following steps: the electric spark wire cutting clamp comprises a base and a separating device used for separating more than two workpieces on the base in a layered mode, wherein the separating device is provided with a matched pressing device used for pressing and fixing the workpieces on the base, the base comprises a base plate, and the part, matched with the separating device, of the base is arranged on the base plate.

As a further improvement of the invention: the base further comprises a fixing part, and a detachable connecting structure is arranged between the base plate and the fixing part.

As a further improvement of the invention: the wire cut electric discharge machine further comprises a chip removal part, wherein the chip removal part comprises a nozzle used for flushing out the molten chips generated in the cutting process and cooling the workpiece.

As a further improvement of the invention: the separating device comprises a guide structure which is matched and connected with the base plate and more than two separating plates which are arranged in a guide mode through the guide structure and are in compression fit with the workpiece.

As a further improvement of the invention: the separating plate is provided with a U-shaped groove with an opening slightly smaller than the length of a workpiece, the upper end face of the separating plate is symmetrically provided with grooves which are used for placing the workpiece and have a depth not larger than the thickness of the workpiece, and the two sides of the U-shaped groove are provided with grooves.

As a further improvement of the invention: and a step is arranged at the bottom of the U-shaped groove.

As a further improvement of the invention: the base plate and the partition plate are provided with connecting holes matched with a pressing device, and the pressing device is a tension rod, one end of which is matched with the connecting holes is provided with a pressing stop part.

The invention discloses another technical scheme of the electric spark wire cutting clamp, which comprises the following steps: the workpiece pressing and fixing device comprises a base and a separating device used for separating more than two workpieces on the base in a layered mode, wherein the separating device is matched with a pressing device used for pressing and fixing the workpieces on the base, the base comprises a base plate, and the part, matched with the separating device, of the base is arranged on the base plate.

As a further improvement of the invention: the base plate is a vertical plate, and a U-shaped groove with an opening slightly smaller than the length of a workpiece is formed in the base plate.

As a further improvement of the invention: the separating device is symmetrically arranged on two sides of the U-shaped groove of the base plate, and the front and back thicknesses of the two separating columns are slightly smaller than the thickness of the workpiece, and two opposite sides of the two separating columns are provided with more than two rectangular through grooves used for installing the workpiece at equal intervals in the longitudinal direction.

As a further improvement of the invention: the pressing device comprises a pressing plate and a fastening bolt, wherein the pressing plate is arranged corresponding to the separation column, and the fastening bolt is used for pressing and fastening the pressing plate and the separation column.

The invention has the beneficial effects that: the wire electric discharge machine tool according to the present invention includes a separating device for mounting a workpiece, which separates one or more workpieces from each other, and can mount a plurality of workpieces at the same time for machining, and can separate the workpieces from each other to form a gap.

Furthermore, the base matched with the separating device comprises a fixed part and a base plate detachably connected with the fixed part, and when a workpiece is loaded and unloaded, the base can be connected with the base plate of another group of clamped workpieces for processing because the process needs time, so that the workpiece can be loaded and unloaded and the workpiece can be processed simultaneously, and the continuous use of the cutting machine is not delayed.

Furthermore, the wire cut electric discharge machining clamp also comprises a chip removal part, and not only can the molten chips generated in the cutting process be flushed out in time, but also the workpiece in the cutting process can be cooled.

Furthermore, the U-shaped groove which is used for limiting the workpiece in the depth direction of the horizontal groove and enabling a gap to be formed between the workpiece and the substrate and the opening of which is slightly smaller than the length of the workpiece is arranged on the separating device.

Furthermore, when the clamping part of the workpiece and the clamp is designed, the clamp is placed by adopting the symmetrical grooves designed on the two sides of the U-shaped groove, or the clamp is placed by adopting the two symmetrical rectangular through grooves, so that the stress is balanced when the workpiece is clamped, and the workpiece can be stably clamped under the condition that the contact surface of the workpiece and the clamp is reduced as much as possible, so that the clamped part of the workpiece is reduced, the raw material of the workpiece is saved, and the workpiece is fully utilized.

Furthermore, in the technical scheme 1 of the invention, the groove bottom of the U-shaped groove is provided with a step, the step enables a gap to be formed between the side surface of the workpiece and the substrate, and in the technical scheme 2, the substrate is provided with the U-shaped groove, and the U-shaped groove also enables a gap to be formed between the side surface of the workpiece and the substrate, so that the liquid sprayed to the workpiece by the nozzle can flow out, and the molten scraps can be discharged in time.

Drawings

FIG. 1 is a diagram: the electric spark wire cutting clamp in the specific embodiment 1 is schematically illustrated after being assembled;

FIG. 2 is a diagram of: a part schematic diagram before assembling of the wire cut electric discharge machining fixture in the specific embodiment 1;

FIG. 3 is a diagram of: the electric spark wire cutting clamp in the specific embodiment 2 is schematically illustrated after being assembled;

FIG. 4 is a diagram of: part schematic diagram before spark-erosion wire cutting anchor clamps assembly in specific embodiment 2.

In the figure: 1. a fixed seat; 2. a substrate; 3. a workpiece; 4. a nozzle; 5. a support; 6. a cross beam; 7. a partition plate; 8. a guide post; 9. separating the columns; 10. a pressure lever; 11. and (7) pressing a plate.

Detailed Description

The following further describes embodiments of the present invention with reference to the drawings.

In the embodiment 1 of the wire electric discharge machine according to the present invention, as shown in fig. 1 to 2, the jig is composed of a holding portion and a chip discharging portion.

The clamping part comprises a fixing part, in this embodiment a holder 1, for fixing the whole clamping part on a guide rail of the wire-cut electrical discharge machine, one end of the holder 1 being provided with a snap groove for clamping the substrate 2. The base plate 2 is provided with a plurality of partition plates 7, the workpiece 3 to be processed is arranged between the base plate 2 and the partition plates 7 or between the partition plates 7 and the partition plates 7, the partition plates 7 and the base plate 2 are guided and arranged together through pressure rods 10 and guide posts 8, and are connected and pressed through the pressure rods 10 and nuts matched with the pressure rods 10, so that the workpiece is fixed at a clamping part.

The base plate 2 is the diaphragm, base plate 2 one end is provided with and is used for with 1 interlock groove complex clamping part of fixing base, and one end is provided with U-shaped step groove, the opening in U-shaped step groove is less than work piece length. The step of the step groove is used for limiting the workpiece 3 in the groove depth direction, so that the workpiece is prevented from contacting the bottom of the U-shaped groove, a gap is formed between the workpiece and the bottom of the U-shaped groove, and molten scraps generated in the processing process are discharged in time. The bottom surface of the base plate 2 is a plane, grooves are symmetrically formed in the upper end surface of the base plate on two sides of the U-shaped stepped groove, the depth of each groove is far smaller than the thickness of the workpiece 3, the workpiece 3 is placed on the upper end surface of each groove, and the workpiece is limited in the direction perpendicular to the depth of the U-shaped groove through the side surface of each groove. The step grooves and the grooves enable the contact area of the workpiece 3 and the substrate 2 to be as small as possible during size design, and materials of the workpiece 3 are fully utilized. The base plate 2 is provided with a threaded hole connected and matched with the pressure rod 10 at the central line position, and threaded holes connected and matched with the guide columns 8 are also arranged at the symmetrical positions of the two sides of the stepped groove.

The material of the partition plate 7 is an insulating material, and in this embodiment, is a resin material. The width of the partition plate 7 is narrower than that of the base plate 2, and a part for clamping the partition plate 7 with the fixing seat 1 is omitted, so that the clamping part of the base plate 2 is avoided, and the partition plate 7 is prevented from interfering with the position of the fixing seat 1 during installation. The other structure of the partition plate 7 is basically the same as the corresponding structure of the base plate 2, except that the holes provided on the partition plate 7 for matching with the pressing rods 10 and the guide posts 8 are through holes.

The guide post 8 is a polished rod, a section of external thread matched with the threaded hole on the substrate 2 is arranged at the joint of the guide post 8 and the substrate 2, and the guide post 8 is in threaded connection with the substrate 2. The guide post is a guide structure.

The pressing rod 10 is provided with an external thread matched with the threaded hole on the substrate 2, and one end of the pressing rod 10 is provided with a pressing stop part which is a pressing platform in the embodiment. The press blocking part can also be provided with a press plate shape. The compression bar 10 is a tension bar.

The chip removal part comprises a cross beam 6, one end of the cross beam is fixed on a headstock of a wire electrode of the wire cut electric discharge machine, one end of the cross beam is movably connected with a support 5 in a rotating mode, more than one nozzle 4 which is longitudinally and evenly distributed is arranged on the support 5, the number of the nozzles 4 is the same as that of the workpieces 3 which are clamped, and each nozzle 4 is aligned to a gap between the workpieces 3.

The clamping process of the wire cut electric discharge machining fixture in the embodiment is as follows: after the guide post 8 is fixedly connected with the base plate 2 through threads, the workpiece 3 is placed on a groove of the base plate 2, the partition plate 7 is pressed on the workpiece 3 through the guide post 8, another workpiece 3 is placed on a groove of the partition plate 7, then another partition plate 7 is pressed on the workpiece 3, a plurality of workpieces 3 and partition plates 7 are sequentially placed according to the mode, after the workpieces 3 and the partition plates 7 are clamped, the compression rod 10 is screwed into a threaded hole of the base plate 2 through the partition plate 7, and a plurality of layers of workpieces are compressed and fixed through a compression table of the compression rod 10 and threaded connection of the compression rod 10 and the base plate 2. Then, the clamping part of the substrate 2 is fixed in the occlusion groove of the fixed seat 1, and the workpiece is fixed on the guide rail of the wire cut electric discharge machine through the fixed seat 1. And finally, adjusting the cross beam 6 and the bracket 5 to enable the nozzles 4 to correspondingly spray the cutting seams at intervals among the workpieces 3, and starting a machining program of the machine tool to perform cutting operation.

When the workpiece is unloaded after cutting, the substrate 2 is taken out of the occlusion groove of the fixed seat 1, the pressing rod 10 is unscrewed, the cut workpiece is horizontally taken out from the clamping position, a new batch of unprocessed workpieces 3 are horizontally placed, and after the pressing rod 10 is screwed down, the substrate 2 is placed into the occlusion groove of the fixed seat 1 again for secondary cutting operation.

As shown in fig. 3 to 4, a wire electric discharge machine according to embodiment 2 of the present invention is composed of a holding portion and a chip discharging portion.

The clamping part comprises a fixed seat 1 used for fixing the whole clamping part on a guide rail of the wire cut electric discharge machine, and one end of the fixed seat 1 is provided with a meshing groove used for clamping a substrate 2. One side of the base plate 2 is connected with a separation column 9 which is provided with mounting grooves at intervals in the longitudinal direction, and a workpiece 3 to be processed is mounted in the mounting groove of the separation column 9 and then is pressed and fixed at a clamping part through a pressing plate 11 connected with the separation column 9.

Base plate 2 is the riser, base plate 2 one side be equipped with interlock groove complex centre gripping boss on the fixing base 1, the one side is provided with the U-shaped groove, and the opening in U-shaped groove slightly is less than the length of work piece 3, the effect in U-shaped groove prevents that work piece 3 from pasting tight base plate 2, forms the clearance between work piece 3 and base plate 2, is favorable to the drainage chip removal of cutting process. The two sides of the U-shaped groove are symmetrically provided with positioning grooves, and threaded holes are formed in the positioning grooves.

The two separation columns 9 are symmetrically arranged on two sides of the U-shaped groove of the substrate 2. The partition column 9 with the one side that base plate 2 hugs closely is provided with base plate 2 on the constant head tank complex location boss, be equipped with in the boss of location with screw hole in the constant head tank on the base plate 2 corresponds unanimous screw hole, base plate 2 with partition column 9 realizes the location installation through the cooperation of constant head tank and location boss, realizes fixed connection between them through holding screw again. In the inboard of two spacer columns 9, the equidistance interval of symmetry is provided with the rectangle and leads to the groove on the longitudinal direction, the rectangle leads to the groove and is the work piece mounting groove, the longitudinal width who leads to the groove slightly is greater than the thickness of work piece, just the transverse length who leads to the groove (thickness around spacer column 9 promptly) slightly is less than the width of work piece 4. And a positioning groove is arranged on one side of the separation column 9 opposite to the rectangular boss, and a threaded hole is formed in the positioning groove. The threaded hole in the positioning boss and the threaded hole in the positioning groove on the partition column 9 may be a threaded through hole which is connected with each other and penetrates through the partition column, or may be two threaded through holes which are not connected with each other and do not penetrate through the partition column, or may be two threaded through holes which penetrate through the partition column.

The pressing plate 11 is made of an insulating elastic material, in this embodiment, a rubber material. The number of the pressing plates 11 is two, and the two pressing plates are arranged corresponding to the separation columns 9. The one side that clamp plate 11 and spacer 9 hug closely is provided with and separates the post 9 on constant head tank complex location boss, be equipped with in the location boss with screw hole in the positioning groove corresponds unanimous screw hole that runs through clamp plate 11 on the spacer 9, clamp plate 11 with spacer 9 realizes the location installation through the cooperation of positioning groove and location boss, realizes again that both fix through the bolt and compress tightly. Meanwhile, the elastic characteristic of the pressure plate 11 is utilized to enable each workpiece to be pressed. The pressing plate 11 may not be made of an elastic material, but the pressing effect is not as good as that of an elastic material.

The clamping process of the wire cut electric discharge machining fixture in the embodiment is as follows: the base plate 2 and the separation column 9 are guided and installed through the matching of the positioning groove and the positioning boss, and the base plate and the separation column are fixedly connected through the set screw. And then, the workpiece 3 is horizontally arranged in a rectangular workpiece mounting groove of the separation column 9, then the pressing plate 11 and the separation column 9 are guided and mounted through the matching of the positioning groove and the positioning boss, and the fixing and the pressing of the positioning groove and the positioning boss are realized through bolts. Meanwhile, the elastic characteristic of the pressure plate 11 is utilized to enable each workpiece to be pressed. And finally, adjusting the cross beam 6 and the bracket 5 to enable the nozzles 4 to correspondingly spray to the gaps among the workpieces 3, and starting a machine tool machining program to perform cutting operation.

When the workpiece is unloaded after cutting, the base plate 2 is taken out from the occlusion groove of the fixed seat 1, the bolt is screwed out, the pressing plate 11 is loosened, and the cut workpiece is taken out. Then, a new batch of unprocessed workpieces 3 are horizontally placed, the pressing plate 11 and the separation columns 9 are fixed, and then the substrate 2 is placed in the occlusion groove of the fixed seat 1 again for secondary cutting operation.

As another embodiment of the present invention, in the above embodiment 2, no set screw is used, and only one bolt is used to connect and fix the pressing plate 11, the separation column 9 and the substrate 2 at the same time, at this time, the threaded holes on the pressing plate 11, the separation column 9 and the substrate 2 are the same threaded holes correspondingly communicated with each other, in this embodiment, when assembling, the pressure plate 11 and the partition column 9 are first bolted together, then the workpiece 3 is horizontally arranged from the other side of the separation column 9, the assembled parts are screwed into the threaded hole of the base plate 2 through a bolt, the whole device is pressed and fixed, the bolt can be screwed out from the base plate 2 only when the workpiece is disassembled, then the workpiece is horizontally taken out from the other side of the partition column 9, and then the next batch of workpieces to be processed is horizontally loaded, and then the assembled parts are screwed into the threaded holes of the base plate 2 through bolts. Although the structure of the device is simplified and the set screw is eliminated, the pressure plate 11, the partition column 9 and the threaded hole on the base plate 2 need to be ensured to be in the same horizontal plane and correspond to each other during assembly, and the bolts need to be connected with 3 parts at the same time, so that the installation precision is high.

Claims

1. An electric spark wire cutting jig characterized in that: the device comprises a base and a separating device used for separating more than two workpieces on the base in a layered manner, wherein the separating device is provided with a matched pressing device used for pressing and fixing the workpieces on the base; the separating device is symmetrically arranged on two sides of the U-shaped groove of the base plate, and the front and back thickness of the separating device is slightly smaller than that of the width of the workpiece, and two rectangular through grooves used for installing the workpiece are arranged on one side, opposite to the separating columns, of the two separating columns at intervals of equal intervals in the longitudinal direction.

2. The wire electric discharge machine according to claim 1, characterized in that: the base further comprises a fixing part, and a detachable connecting structure is arranged between the base plate and the fixing part.

3. The wire electric discharge machine according to claim 1, characterized in that: the wire cut electric discharge machine further comprises a chip removal part, wherein the chip removal part comprises a nozzle used for flushing out the molten chips generated in the cutting process and cooling the workpiece.

4. The wire electric discharge machine according to any one of claims 1 to 3, characterized in that: the pressing device comprises a pressing plate and a fastening bolt, wherein the pressing plate is arranged corresponding to the separation column, and the fastening bolt is used for pressing and fastening the pressing plate and the separation column.