Positioning device for electric spark machining

Abstract

The utility model discloses a positioning device for electric spark machining. The positioning device comprises a positioning seat (1), a positioning pin (2), a pressing plate (3) and a standard screw (5), the bottom of the positioning seat (1) is mounted on a magnetic disk of a workbench of electric spark equipment, one side surface of the positioning seat (1) is a positioning surface, the lower part of the positioning surface is a convex part, the upper part of the positioning surface is a concave part, a plurality of positioning grooves are formed in the lower part of the positioning surface, and a plurality of positioning holes are formed in the upper part of the positioning surface; one side face of the pressing plate (3) is a pressing face, and a plurality of bosses are arranged on the pressing face. A to-be-machined part is arranged in the positioning groove, and the positioning pin (2) penetrates through a positioning datum hole in the to-be-machined part to be in threaded connection with the positioning hole. Standard screws (5) penetrate through through holes formed in the two ends of the pressing plate (3) and are in threaded connection with M threaded holes in the lower portion of the positioning face. The device is simple in structure, convenient to operate and capable of achieving machining of batch parts with different outer diameter specifications according to the special requirements for the shape, the size and the like in a machined part hole.

Description

Technical Field

[0001] The utility model belongs to the technical field of machining, and relates to a positioning device for electric discharge machining. Background Art

[0002] In daily production and machining, sometimes it is necessary to machine small square grooves in holes of some pipe parts. Due to the small size of the square grooves, high machining accuracy, and position tolerance requirements, it is impossible to guarantee by using general machining methods. When using electric discharge machining equipment, because the positioning and alignment are relatively troublesome, and for each part machined, it is necessary to repeatedly measure and align with a dial indicator, the machining efficiency is very low. Therefore, under the premise of mass production, when machining such pipe parts with small square grooves in holes, in order to ensure the machining quality and improve the production efficiency, it is particularly important to design a positioning device for electric discharge machining. Summary of the Utility Model

[0003] (1) Purpose of the Utility Model

[0004] The purpose of the utility model is to provide a positioning device for electric discharge machining in order to machine high-precision small square grooves in holes of pipe parts, ensure the machining quality, improve the production efficiency, and have good practicability and popularization.

[0005] (2) Technical Solution

[0006] In order to solve the above technical problems, the utility model provides a positioning device for electric discharge machining, which includes: a positioning seat 1, a positioning pin 2, a pressing plate 3, and a standard screw 5; the bottom of the positioning seat 1 is installed on the workbench disk of the electric discharge machining equipment. One side of the positioning seat 1 is a positioning surface, the lower part of the positioning surface is a convex part, the upper part of the positioning surface is a concave part. A plurality of positioning grooves are provided in the lower part of the positioning surface, and a plurality of positioning holes are provided in the upper part of the positioning surface; one side of the pressing plate 3 is a pressing surface, and a plurality of convex platforms are arranged on the pressing surface; the part to be machined is arranged in the positioning grooves, and the positioning pin 2 passes through the positioning reference hole on the part to be machined and is threadedly connected with the positioning hole; the standard screw 5 passes through the through holes provided at both ends of the pressing plate 3 and is threadedly connected with the M threaded hole in the lower part of the positioning surface.

[0007] Wherein, the positioning groove is a 90° V-shaped groove.

[0008] Wherein, a rubber pad 4 is arranged on the end face of the convex platform.

[0009] Wherein, the positioning hole in the upper part of the positioning surface is denoted as a φd hole; one end outer circle of the positioning pin 2 is a φd1 outer circle, and the other end outer circle is a φd2 outer circle; the φd hole on the positioning seat 1 and the φd1 outer circle on the positioning pin 2 adopt an H7 / h6 small clearance fit.

[0010] Among them, the through holes opened at both ends of the pressing plate 3 are φd3 holes, and there is a clearance fit of 0.4 - 0.5 mm between the φd3 holes on the pressing plate 3 and the outer diameter M of the standard screw 5.

[0011] Among them, the rubber pad 4 is pasted on the convex end face of the pressing plate 3 with epoxy resin glue.

[0012] Among them, the number of φd holes on the positioning seat 1 is the same as the number of several 90° V-shaped grooves on it. In the axial direction of the part to be machined, the centers of the φd holes, the centers of the 90° V-shaped grooves, and the axis of the part to be machined arranged coaxially are coplanar.

[0013] Among the several positioning holes on the positioning seat 1, every two are the same; when there are multiple holes, the center distance L1 between every two φd holes is the same.

[0014] Among them, the φd2 outer circle on the positioning pin 2 has a minimum clearance fit of H7 / h6 with the reference positioning hole on the part to be machined.

[0015] Among them, there are 3 90° V-shaped grooves.

[0016] (III) Beneficial effects

[0017] The positioning device for electric discharge machining provided by the above technical solution has a simple structure and is convenient to operate, and can realize the machining of batch parts with different outer diameter specifications according to special requirements such as the shape and size of the holes in the part to be machined. Description of the drawings

[0018] Figures 1 - 3 They are respectively the front view, top view, and left view of a positioning device for electric discharge machining of the present utility model;

[0019] Figures 4 - 6 They are respectively the front view, top view, and left view of the positioning seat in a positioning device for electric discharge machining of the present utility model;

[0020] Figure 7 It is a schematic diagram of the positioning pin of a positioning device for electric discharge machining of the present utility model;

[0021] Figures 8 - 9 They are respectively the front view and cross-sectional view of the pressing plate in a positioning device for electric discharge machining of the present utility model;

[0022] Figure 10 It is a schematic diagram of the rubber pad in a positioning device for electric discharge machining of the present utility model;

[0023] Figure 11 It is a schematic diagram of the standard screw in a positioning device for electric discharge machining of the present utility model;

[0024] Reference numerals in the figure: 1 - positioning seat, 2 - positioning pin, 3 - pressing plate, 4 - rubber pad, 5 - standard screw. Specific embodiments

[0025] To make the objectives, contents and advantages of the present utility model clearer, the following further describes in detail the specific embodiments of the present utility model with reference to the accompanying drawings and embodiments.

[0026] Refer to Figures 1 - 6 , the positioning device for electric discharge machining in this embodiment includes: a positioning seat 1, a positioning pin 2, a pressing plate 3, and a standard screw 5; the bottom of the positioning seat 1 is installed on the magnetic disk of the workbench of the electric discharge equipment, one side surface of the positioning seat 1 is a positioning surface, the lower part of the positioning surface is a convex part, the upper part of the positioning surface is a concave part, several positioning grooves are provided on the lower part of the positioning surface, and several positioning holes are provided on the upper part of the positioning surface; one side surface of the pressing plate 3 is a pressing surface, and several bosses are provided on the pressing surface; the part to be machined is arranged in the positioning groove, and the positioning pin 2 passes through the positioning reference hole on the part to be machined and is threadedly connected with the positioning hole; the standard screw 5 passes through the through holes provided at both ends of the pressing plate 3 and is threadedly connected with the M threaded hole at the lower part of the positioning surface.

[0027] Among them, the positioning groove is a 90° V-shaped groove. A rubber pad 4 is provided on the end surface of the boss.

[0028] The positioning holes on the upper part of the positioning surface are denoted as φd holes; one end outer circle of the positioning pin 2 is a φd1 outer circle, and the other end outer circle is a φd2 outer circle; the through holes provided at both ends of the pressing plate 3 are φd3 holes.

[0029] The φd holes on the positioning seat 1 and the φd1 outer circle on the positioning pin 2 adopt an H7 / h6 small clearance fit, the φd3 holes on the pressing plate 3 and the threaded outer diameter M of the standard screw 5 adopt a 0.4 - 0.5 mm clearance fit, and the rubber pad 4 can be pasted on the upper end surface of the boss of the pressing plate 3 with epoxy resin glue. During assembly, first insert the threaded end of the standard screw 5 into the φd3 hole of the pressing plate 3, align it with the M threaded hole on the positioning seat 1, then install the part to be machined on the V-shaped groove of the positioning seat 1 through the positioning pin 2, and finally tighten the standard screw 5.

[0030] The φd holes on the positioning seat 1 and the φd1 connecting outer circle of the positioning pin 2 adopt an H7 / h6 small clearance fit, which can keep the positioning pin 2 and the positioning seat 1 relatively stable and form an integral body, preventing axial rotation after the product is installed and affecting the positioning accuracy of the product.

[0031] The centers of the 3 φd holes on the positioning seat 1 and the centers of the 3 90° V-shaped grooves on it should be ensured to be consistent, and the symmetry degree is within 0.01 mm, which can ensure the symmetry between the outer circle of the product and the center of the positioning hole. The sizes of the 3 90° V-shaped grooves can be adjusted according to the outer diameter sizes of different product parts and can be flexibly selected.

[0032] The center distances L1 of the three φd holes on the positioning seat 1 should be the same pairwise. When there are multiple holes, the dimension L1 between every two holes should be ensured to be the same; otherwise, it will affect the machining position accuracy of the product parts. The length L2 on the positioning seat 1 can be adjusted and selected according to the actual length of the positioning surface of the product parts. The length L3 on the positioning seat 1 should be the same as the length L4 on the pressing plate 3 to ensure the installation position.

[0033] The outer circle φd1 of the positioning pin 2 and the φd hole on the positioning seat 1 adopt an H7 / h6 small clearance fit, so that the two can be assembled together without large clearance, thus ensuring the positioning accuracy. The outer circle φd2 of the positioning pin 2 is connected and positioned with the reference positioning hole on the product part to be machined, also adopting an H7 / h6 small clearance fit to ensure its positioning accuracy.

[0034] The length L5 of the positioning pin 2 is assembled with the φd hole on the positioning seat 1 to ensure that it penetrates more than two-thirds of the total thickness of the positioning seat 1 to ensure stable positioning. The length L6 of the positioning pin 2 passes through the outer circle D of the positioning reference hole on the product part to be machined and then extends 40 mm to 50 mm. This is to surface gauge, straighten, align the center during the initial machining, and detect whether the φd hole of the positioning seat 1 is perpendicular to its end face reference; otherwise, it will affect the positioning accuracy.

[0035] The end faces of the three bosses on the pressing plate 3 are bonded to the rubber pad 4, which is convenient for pressing the outer circle of the product parts to ensure that the product parts do not axially move during machining, and at the same time, it can also prevent the outer circle of the product parts from being damaged. The φd3 hole on the pressing plate 3 is correspondingly connected to the M threaded hole on the positioning seat 1 to ensure that the pressing plate 3 presses the product and is fixed on the positioning seat 1.

[0036] The rubber pad 4 is installed on the boss end face of the pressing plate 3 to eliminate the slight diameter error of the outer circle of the product part to be machined; otherwise, different outer circle diameters will cause the pressing plate 3 to not be able to press the three parts simultaneously. At the same time, the rubber pad 4 can also prevent the outer circle of the product part from being damaged.

[0037] The working principle of the positioning device for EDM in this embodiment is as follows:

[0038] Before processing parts, first place the positioning device on the worktable disk of the EDM equipment, punch and straighten the V-groove end face of the positioning seat 1, flatten and align it in the horizontal and vertical directions, and fix the positioning seat 1 with a magnetic suction cup. Then insert the φd1 outer circle of the locating pin 2 into the φd hole on the positioning seat 1 and insert it into place. Use the φd2 outer circle of the locating pin 2 to punch and align the center. At this time, place the outer circle of the processed product part in the 90° V-groove of the locating seat 1. At the same time, the positioning reference hole on the part is inserted into the φd2 hole of the locating pin 2. By analogy, the three product parts are installed on the positioning seat 1 according to this method. Finally, use two standard screws 5 to pass through the φd3 hole on the pressure plate 3, screw into the M threaded hole of the positioning seat 1, and install and tighten it, so as to press and fix the product parts.

[0039] After installing the positioning device and product parts, start installing the small square groove electrode of the processed part. The electrode material is copper, which has good conductivity. The electrode is designed and manufactured according to the shape and size of the small square groove. The small square groove is concave, and the electrode is cylindrical. Its processing principle is based on electrical corrosion discharge, corroding the surface of the processed metal little by little, so as to form the required small square groove shape and size. The electrode is a square column, and a cylinder with an outer diameter of about φ5 and a length of about 35mm is welded on it. It is used to be installed in the drill clamp on the spindle of the machine tool. The table is straightened to find the positive electrode center, the machine tool is started, and the spindle is moved so that the electrode center is aligned with the center of the small square groove position in the hole of the processed part, and then the zero base surface is selected from the upper end face of the part, and the processing program is compiled. After setting the processing depth, the distance between the two parts L1, and the discharge time and other parameters, the small square groove can be processed continuously and automatically until all three parts are clamped at one time. After the processing is completed, loosen the standard screw 5, remove the part, and complete the processing of the small square groove. In this way, three parts can be processed at the same time by calibrating once, which greatly saves auxiliary processing time and improves production efficiency.

[0040] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the technical principles of the present invention. These improvements and modifications should also be regarded as the protection scope of the present invention.

Claims

1. A positioning device for electrospark machining, characterized in that: include: A positioning seat (1), a positioning pin (2), a pressure plate (3), and a standard screw (5); the bottom of the positioning seat (1) is mounted on a magnetic disk of an electric spark device worktable, one side of the positioning seat (1) is a positioning surface, the lower part of the positioning surface is a convex part, the upper part of the positioning surface is a concave part, a plurality of positioning grooves are provided on the lower part of the positioning surface, and a plurality of positioning holes are provided on the upper part of the positioning surface; one side of the pressure plate (3) is a clamping surface, and a plurality of bosses are provided on the clamping surface; the part to be processed is arranged in the positioning groove, the positioning pin (2) passes through the positioning reference hole on the part to be processed and is threadedly connected to the positioning hole; the standard screw (5) passes through the through holes provided at both ends of the pressure plate (3) and is threadedly connected to the M threaded hole at the lower part of the positioning surface.

2. The positioning device for electric spark machining according to claim 1, characterized in that: The positioning groove is a 90° V-shaped groove.

3. The positioning device for electric spark machining according to claim 2, characterized in that: A rubber pad (4) is arranged on the end surface of the boss.

4. The positioning device for electric spark machining according to claim 3, characterized in that: The positioning hole on the upper part of the positioning surface is marked as φd hole; the outer circle of one end of the positioning pin (2) is φd1 outer circle, and the outer circle of the other end is φd2 outer circle; the φd hole on the positioning seat (1) and the φd1 outer circle on the positioning pin (2) are matched with a small clearance of H7 / h6.

5. The positioning device for electric spark machining according to claim 4, characterized in that: The through holes opened at both ends of the pressing plate (3) are φd3 holes, and the φd3 holes on the pressing plate (3) and the thread outer diameter M of the standard screw (5) are matched with a clearance of 0.4 to 0.5 mm.

6. The positioning device for electric spark machining according to claim 5, characterized in that: The rubber pad (4) is adhered to the end surface of the boss of the pressing plate (3) by using epoxy resin glue.

7. The positioning device for electric spark machining according to claim 6, characterized in that: The number of the plurality of φd holes on the positioning seat (1) is consistent with the number of the plurality of 90° V-shaped grooves thereon, and in the axial direction of the part to be processed, the centers of the φd holes, the centers of the 90° V-shaped grooves and the axial direction of the part to be processed arranged in the coaxial direction are coplanar.

8. The positioning device for electric spark machining according to claim 7, characterized in that: Among the plurality of positioning holes on the positioning seat (1), two are consistent with each other; when there are multiple holes, the center distance L1 of each pair of φd holes is consistent.

9. The positioning device for electric spark machining according to claim 8, characterized in that: The outer circle of φd2 on the positioning pin (2) is matched with the reference positioning hole on the part to be processed with a small clearance of H7 / h6.

10. The positioning device for electric spark machining according to claim 9, characterized in that: The 90° V-shaped grooves are provided with three.

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