Positioning device for electric discharge machining

Abstract

The utility model belongs to the technical field of machining, disclose a kind of positioning device for spark machining, it includes: locating seat (1), locating pin (2), pressing plate (3);Locating seat (1) is provided with V-shaped groove, and the product to be processed is tubular, and one side is positioned and placed in V-shaped groove, locating pin (2) is positioned on locating seat (1) by the through hole on the product to be processed, and pressing plate (3) is arranged on the other side of the product to be processed and is tightened on locating seat (1) by standard screw (5).The utility model is simple in structure, convenient to operate, and can realize the machining of different outer diameter specifications batch parts according to the special requirements such as the shape and size of the hole of the part to be processed.

Description

Technical Field

[0001] This utility model belongs to the field of mechanical processing technology and relates to a positioning device for electrical discharge machining. Background Technology

[0002] In daily production and processing, we sometimes encounter tubular parts that require the machining of small square grooves in their holes. Due to the small size of the grooves, the high machining precision, and the positional tolerance requirements, general machining methods cannot guarantee the accuracy. While electrical discharge machining (EDM) can be used, positioning and alignment are quite troublesome, requiring repeated dial indicator adjustments for each piece, resulting in very low processing efficiency. Therefore, under the premise of a certain batch production, it is particularly important to design a positioning device for EDM to ensure the machining quality and improve production efficiency when machining these small square groove parts in tubular holes. Utility Model Content

[0003] (a) Purpose of the utility model The purpose of this utility model is to provide a positioning device for electrical discharge machining in order to process high-precision small square grooves in the holes of tubular parts, ensure processing quality, improve production efficiency, and have good practicality and scalability.

[0004] (II) Technical Solution To solve the above-mentioned technical problems, this utility model provides a positioning device for electrical discharge machining, which includes: a positioning seat 1, a positioning pin 2, and a pressure plate 3; the positioning seat 1 is provided with a V-shaped groove, the workpiece is tubular, one side of which is positioned against the V-shaped groove, the positioning pin 2 passes through the through hole on the workpiece and positions the workpiece on the positioning seat 1, and the pressure plate 3 is arranged against the other side of the workpiece and is tightened onto the positioning seat 1 by a standard screw 5.

[0005] Furthermore, the bottom of the positioning seat 1 is fixed to the worktable, and a protruding positioning block is provided in the middle of its side wall. Multiple longitudinal V-shaped grooves are opened side by side on the positioning block to place and position the product to be processed.

[0006] Furthermore, the V-groove is a 90° V-groove.

[0007] Furthermore, multiple positioning holes are provided on the positioning seat 1, with each positioning hole corresponding to a V-shaped groove and located on the side wall above the V-shaped groove, for the positioning pin 2 to pass through and be positioned.

[0008] Furthermore, the pressure plate 3 is provided with multiple bosses, each of which corresponds to the product being processed and acts as a pressing force on the other side of the product being processed.

[0009] Furthermore, a rubber pad 4 is provided on each boss, and the rubber pad 4 is glued to the end face of the boss of the pressure plate 3 with epoxy resin adhesive.

[0010] Furthermore, two mounting holes are provided on the pressure plate 3, located at both ends of the pressure plate 3, and standard screws 5 are passed through the mounting holes and tightened onto the positioning seat 1.

[0011] Furthermore, the positioning hole on the positioning seat 1 and the outer circle of the positioning pin 2 adopt an H7 / h6 clearance fit.

[0012] Furthermore, the mounting holes on the pressure plate 3 and the thread outer diameter M of the standard screw 5 are fitted with a clearance of 0.4 to 0.5 mm.

[0013] Furthermore, the line connecting the center of the positioning hole on the positioning seat 1 and the center of the 90° V-groove is parallel to the axis of the product being processed; the size of the 90° V-groove is adjusted according to the outer diameter of the product being processed; the positions of the boss and the mounting hole on the pressure plate 3 are symmetrically distributed; the length of the V-groove on the positioning seat 1 is adjusted and selected according to the actual positioning surface length of the product being processed.

[0014] (III) Beneficial Effects The positioning device for electrical discharge machining provided by the above technical solution has a simple structure and is easy to operate. It can process batches of parts with different outer diameter specifications according to the special requirements of the shape and size of the holes in the workpiece. Attached Figure Description

[0015] Figures 1 to 3 These are, respectively, the front view, side view, and sectional view of a positioning device for electrical discharge machining according to this utility model; Figures 4 to 6 These are, respectively, the front view, side view, and sectional view of the positioning seat of the positioning device for electrical discharge machining according to this utility model; Figure 7 This is a schematic diagram of a positioning pin for a positioning device used in electrical discharge machining according to this utility model; Figure 8 and Figure 9 These are, respectively, the front view and the sectional view of the pressure plate of the positioning device for electrical discharge machining according to this utility model; Figure 10 This is a schematic diagram of a rubber pad for a positioning device in electrical discharge machining according to the present invention; Figure 11 This is a schematic diagram of a standard screw for a positioning device used in electrical discharge machining according to this utility model; The numbers in the diagram are: 1-positioning seat, 2-positioning pin, 3-pressure plate, 4-rubber pad, 5-standard screw. Detailed Implementation

[0016] To make the objectives, contents, and advantages of this utility model clearer, the specific embodiments of this utility model will be described in further detail below with reference to the accompanying drawings and examples.

[0017] See Figures 1-11The positioning device for electrical discharge machining in this embodiment includes: a positioning seat 1, a positioning pin 2, and a pressure plate 3; the positioning seat 1 is provided with a V-shaped groove, the product to be processed is tubular, one side of which is positioned against the V-shaped groove, the positioning pin 2 passes through the through hole on the product to position the product to be processed on the positioning seat 1, and the pressure plate 3 is arranged against the other side of the product to be processed and is tightened onto the positioning seat 1 by a standard screw 5.

[0018] The bottom of the positioning seat 1 is fixed on the worktable, and a protruding positioning block is provided in the middle of its side wall. Multiple longitudinal V-shaped grooves are opened side by side on the positioning block to place and position the product to be processed.

[0019] The V-groove is a 90° V-groove.

[0020] The positioning seat 1 has multiple positioning holes, which correspond one-to-one with the V-shaped groove and are located on the side wall above the V-shaped groove, so that the positioning pin 2 can be inserted for positioning.

[0021] The pressure plate 3 is provided with multiple bosses, each of which corresponds to the product being processed and acts as a pressing force on the other side of the product being processed.

[0022] Rubber pads 4 are installed on each boss.

[0023] Two mounting holes are provided on the pressure plate 3, located at both ends of the pressure plate 3. Standard screws 5 pass through the mounting holes and are tightened onto the positioning seat 1.

[0024] The positioning hole on the positioning seat 1 and the outer circle of the positioning pin 2 are fitted with a small clearance of H7 / h6, which can keep the positioning pin 2 and the positioning seat 1 relatively stable and form an integral unit, preventing axial rotation after the product is installed, which would affect the positioning accuracy of the product.

[0025] The mounting holes on the pressure plate 3 and the outer diameter M of the standard screw 5 are fitted with a clearance of 0.4 to 0.5 mm.

[0026] The rubber pad 4 is glued to the end face of the boss of the pressure plate 3 with epoxy resin adhesive.

[0027] During assembly, first insert the threaded end of the standard screw 5 into the mounting hole of the pressure plate 3, align it with the threaded hole on the positioning seat 1, then install the product to be processed in the V-groove on the positioning seat 1 through the positioning pin 2, and finally tighten the standard screw 5.

[0028] The line connecting the center of the positioning hole on the positioning seat 1 and the center of the 90° V-groove is parallel to the axis of the product being processed, with a symmetry within 0.01mm. This ensures that the outer circle of the product is symmetrical with the center of the positioning hole. The size of the 90° V-groove can be adjusted according to different outer diameters of the product, allowing for flexible selection.

[0029] On pressure plate 3, the bosses and mounting holes are symmetrically distributed.

[0030] The length of the V-groove on the positioning seat 1 can be adjusted and selected according to the actual positioning surface length of the product parts.

[0031] Example like Figure 1-11 As shown, the outer circle φd1 on the locating pin 2 and the φd hole on the locating seat 1 are fitted with a small clearance of H7 / h6. This allows them to be assembled together without a large gap, thus ensuring positioning accuracy. The outer circle φd2 on the locating pin 2 is connected and positioned to the reference locating hole on the workpiece part, also using a small clearance of H7 / h6 to ensure its positioning accuracy.

[0032] The L5 length of the positioning pin 2 is assembled with the φd hole on the positioning seat 1, ensuring that it penetrates more than two-thirds of the total thickness of the positioning seat 1 to ensure stable positioning. The L6 length of the positioning pin 2 passes through the outer circle D of the positioning reference hole on the workpiece and extends by 40mm to 50mm. This is for the purpose of using a dial indicator, straightening, and centering during the initial processing, and to check whether the φd hole of the positioning seat 1 is perpendicular to its end face reference; otherwise, the positioning accuracy will be affected.

[0033] The three protruding end faces on the pressure plate 3 are bonded together with the rubber pad 4 to facilitate pressing the outer circle of the product part, ensuring that the product part does not move axially during processing, and also preventing damage to the outer circle of the product part. The φd3 hole on the pressure plate 3 is connected to the M hole on the positioning seat 1 to ensure that the pressure plate 3 presses the product firmly and is fixed on the positioning seat 1.

[0034] The rubber pad 4 is installed on the boss end face of the pressure plate 3 to eliminate minor errors in the outer diameter of the processed product parts. Otherwise, different outer diameters would prevent the pressure plate 3 from simultaneously pressing three parts. The rubber pad 4 also prevents the outer diameter of the product parts from being damaged.

[0035] The working principle of the positioning device for electrical discharge machining in this embodiment is as follows: Before machining the parts, first place the positioning device on the worktable disk of the EDM equipment, use a dial indicator to straighten the V-groove end face of the positioning seat 1, and level and align it in both horizontal and vertical directions. Then, fix the positioning seat 1 with a magnetic chuck. Next, insert the outer circle of the positioning pin 2φd1 into the φd hole of the positioning seat 1 and insert it into place. Use a dial indicator to align the center of the positioning pin 2φd2. At this time, place the outer circle of the product part to be machined in the 90° V-groove of the positioning seat 1. At the same time, insert the positioning reference hole on the part into the φd2 of the positioning pin 2. Repeat this process to install all three product parts on the positioning seat 1. Finally, use two standard screws 5 through the φd3 hole on the pressure plate 3 and screw them into the M thread hole of the positioning seat 1 to install and tighten them, thereby pressing and fixing the product parts.

[0036] After installing the positioning device and product parts, the small square groove electrode of the workpiece is installed. The electrode material is copper, which has excellent 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 electro-corrosion discharge, which corrodes the surface of the metal being processed little by little, thereby forming the required shape and size of the small square groove.

[0037] The electrode is square-column shaped, with a cylindrical piece of approximately φ5 (about 35mm long) welded on top. This piece is used to mount the electrode in a chuck on the machine tool spindle. After using a dial indicator and straightening the electrode to align its center, the machine tool is started, and the spindle is moved until the electrode center is aligned with the center of the small square groove in the hole of the workpiece. Then, a zero-datum surface is selected from the top surface of the workpiece, and a machining program is created. After setting the machining depth, the distance L1 between the two workpieces, and parameters such as discharge time and speed, the small square groove can be machined continuously and automatically until all three workpieces are machined in one setup. Finally, the standard screw 5 is loosened, the workpiece is removed, and the machining of the small square groove is complete. In this way, three workpieces can be machined simultaneously with a single dial indicator setup, significantly saving auxiliary machining time and improving production efficiency.

[0038] The above description is only a preferred embodiment of the present utility model. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the technical principles of the present utility model, and these improvements and modifications should also be considered within the protection scope of the present utility model.

Claims

1. A positioning device for electrical discharge machining, characterized in that, include: Positioning seat (1), positioning pin (2), pressure plate (3); The positioning seat (1) is provided with a V-shaped groove. The product to be processed is tubular, and one side of it is placed in the V-shaped groove for positioning. The positioning pin (2) passes through the through hole on the product to position the product to be processed on the positioning seat (1). The pressure plate (3) is arranged in close contact with the other side of the product to be processed and is tightened on the positioning seat (1) by a standard screw (5).

2. The positioning device for electrical discharge machining as described in claim 1, characterized in that, The bottom of the positioning seat (1) is fixed on the workbench, and a protruding positioning block is provided in the middle of its side wall. Multiple longitudinal V-shaped grooves are opened side by side on the positioning block to place and position the processed product.

3. The positioning device for electrical discharge machining as described in claim 2, characterized in that, The V-groove is a 90° V-groove.

4. The positioning device for electrical discharge machining as described in claim 3, characterized in that, Multiple positioning holes are provided on the positioning seat (1). The positioning holes correspond one-to-one with the V-shaped groove and are located on the side wall above the V-shaped groove, so that the positioning pin (2) can be inserted for positioning.

5. The positioning device for electrical discharge machining as described in claim 4, characterized in that, The pressure plate (3) is provided with multiple bosses, which correspond one-to-one with the processed product and press against the other side of the processed product.

6. The positioning device for electrical discharge machining as described in claim 5, characterized in that, Each boss is provided with a rubber pad (4), which is glued to the end face of the boss of the pressure plate (3) with epoxy resin.

7. The positioning device for electrical discharge machining as described in claim 6, characterized in that, Two mounting holes are provided on the pressure plate (3), which are located at both ends of the pressure plate (3). Standard screws (5) are passed through the mounting holes and tightened onto the positioning seat (1).

8. The positioning device for electrical discharge machining as described in claim 7, characterized in that, The positioning hole on the positioning seat (1) and the outer circle of the positioning pin (2) are fitted with an H7 / h6 clearance.

9. The positioning device for electrical discharge machining as described in claim 8, characterized in that, The mounting hole on the pressure plate (3) and the outer diameter M of the standard screw (5) are fitted with a clearance of 0.4 to 0.5 mm.

10. The positioning device for electrical discharge machining as described in claim 9, characterized in that, The line connecting the center of the positioning hole on the positioning seat (1) and the center of the 90° V-groove is parallel to the axis of the product being processed; the size of the 90° V-groove is adjusted according to the outer diameter of the product being processed; the positions of the boss and the mounting hole on the pressure plate (3) are symmetrically distributed; the length of the V-groove on the positioning seat (1) is adjusted and selected according to the actual positioning surface length of the product being processed.

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