Electric spark work fixture

Abstract

The utility model provides an electric spark work fixture which comprises a fixture body, the fixture body is provided with a through hole penetrating up and down, and a polygonal positioning column is formed in the middle of the fixture body. The bottom surface of the clamp is flat, and the clamp can be detachably connected with an electrode below the clamp through a fastener (such as a bolt) from top to bottom in a vertically-through through hole of the clamp. The detachable connection is convenient to disassemble and assemble, the repeated use of the clamp can be realized, and the waste is avoided. And compared with a previous bonding mode, the detachable connection mode is more stable, the clamp can be fixed on the electrode and then the electrode is processed, so that the relative positions of the clamp and the electrode are fixed, the clamp and the electrode can be conveniently positioned as a whole during electric spark processing, and the operation is more convenient and accurate. Meanwhile, the polygonal positioning column can be more conveniently matched with a clamping mechanism of equipment, the axial positions of the clamp and the electrode are positioned, and the proofreading step is simplified.

Description

Technical Field

[0001] The utility model relates to the technical field of electric spark machining equipment, in particular to an electric spark tooling fixture. Background Art

[0002] Electrospark machining equipment is a mechanical processing equipment that uses the electro-erosion effect of pulse discharge between the tool electrode and the workpiece to process the workpiece. This equipment is widely used in the manufacture of various metal molds and mechanical equipment. When performing electrospark machining, the equipment control system controls the constant discharge gap between the tool electrode and the workpiece, while the workpiece metal is etched away, and the tool electrode is continuously fed to the workpiece, so as to process the workpiece surface corresponding to the shape of the tool electrode. Therefore, when different workpiece surfaces need to be processed, tool electrodes of corresponding shapes need to be used. In existing electrospark machining equipment, the tool electrode corresponding to the shape of the workpiece to be processed is usually glued with a clamping shaft. After fixing the clamping shaft on the equipment, it is necessary to first perform position calibration. Since the relative position of the clamping shaft and the equipment is uncertain, each disassembly and assembly requires a complicated verification process, which is time-consuming and inefficient. In addition, when the tool electrode is used up, the electrode is generally knocked off directly, resulting in waste. Summary of the invention

[0003] In view of the above-mentioned deficiencies in the prior art, the purpose of the utility model is to provide an EDM fixture that is easy to reuse and accurate in positioning.

[0004] The utility model achieves the above purpose in the following way:

[0005] The utility model discloses an electric spark fixture, comprising a fixture, wherein the fixture is provided with a through hole penetrating up and down, and a polygonal positioning column is formed in the middle of the fixture.

[0006] Furthermore, a clamping protrusion extends upward from the top of the clamp, and an outer periphery of the clamping protrusion forms a clamping surface in the shape of an inverted cone.

[0007] Furthermore, it also includes a main body, a clamping shaft is provided on the top of the main body, a clamping cavity is provided in the middle, and a receiving cavity matched with the positioning column is opened at the bottom, two clamping blocks that can be relatively moved and fixed are installed in the clamping cavity, the opposite surfaces of the two clamping blocks are recessed and when surrounded, a through cavity that can accommodate and clamp the clamping protrusion is formed, and a connecting hole connected with the receiving cavity is opened below the clamping cavity.

[0008] Furthermore, the clamping blocks have coaxial holes formed relatively to each other and are connected via fasteners.

[0009] Furthermore, the cross section of the positioning column is quadrilateral or hexagonal.

[0010] Furthermore, a protrusion that cooperates with the clamping surface is laterally extended from the opposite surface of the clamping block, and a pressing surface that can press against the edge of the accommodating cavity is provided below the clamp.

[0011] Furthermore, the clamping cavity is arranged in the middle of the main body and is transversely penetrated.

[0012] Furthermore, a spring is installed on the opposite surface of the clamping block.

[0013] Furthermore, a pair of spring holes for installing the springs are provided on both sides of the opposite surfaces of the clamping block.

[0014] Furthermore, a reference surface is provided below the main body.

[0015] Beneficial effects of the utility model: The utility model provides an EDM tooling fixture, including a fixture, the fixture is provided with through holes penetrating from top to bottom, and a polygonal positioning column is formed in the middle of the fixture. The bottom surface of the fixture is flat, and can be detachably connected to the electrode below from top to bottom through fasteners (such as bolts) in the through holes penetrating from top to bottom. This detachable connection is convenient for assembly and disassembly, and the fixture can be reused without waste. Moreover, compared with the previous bonding method, this detachable connection method is more stable, and the electrode can be processed after the fixture is fixed on the electrode, so that the relative position of the fixture and the electrode is fixed, which is convenient for positioning as a whole during EDM processing, and the operation is more convenient and accurate. At the same time, the polygonal positioning column is more convenient to cooperate with the clamping mechanism of the equipment, locate the axial position of the fixture and the electrode, and simplify the proofreading steps. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The utility model is further described below in conjunction with the accompanying drawings and embodiments:

[0017] Figure 1 This is a schematic diagram of a clamp structure of the utility model;

[0018] Figure 2 for Figure 1 Schematic diagram of the connection relationship between the fixture and the electrode;

[0019] Figure 3 It is a schematic diagram of the main structure;

[0020] Figure 4 It is a schematic diagram of the assembly structure of the main body and the fixture;

[0021] Figure 5 This is a schematic diagram of the split structure of the main body and the fixture;

[0022] Figure 6 for Figure 5 Schematic diagram of the connection structure between the middle clamp block and the clamp;

[0023] Figure 7 Schematic diagram of the clamping block structure.

[0024] In the figure, 1 is a clamp, 11 is a through hole, 12 is a positioning column, 13 is a clamping protrusion, 14 is a clamping surface, 15 is a pressing surface, 2 is a main body, 20 is a clamping shaft, 21 is a clamping cavity, 22 is an accommodating cavity, 23 is a clamping block, 231 is a coaxial hole, 24 is a through cavity, 25 is a connecting hole, 26 is a protrusion, 27 is a spring hole, 28 is a calibration surface, 3 is a spring, and 4 is an electrode. DETAILED DESCRIPTION

[0025] refer to Figures 1 to 7 As shown, an electric spark fixture is shown, including a fixture 1, wherein the fixture 1 is provided with a through hole 11 penetrating from top to bottom, and a polygonal positioning column 12 is formed in the middle of the fixture 11.

[0026] As shown in the accompanying drawings, the bottom surface of the clamp 1 is flat, and it can be detachably connected to the electrode 4 below from top to bottom through fasteners such as bolts in the through holes 11 that penetrate the clamp 1 from top to bottom. This detachable connection is easy to assemble and disassemble, and the clamp 1 can be reused without waste. Moreover, compared with the previous bonding method, this detachable connection method is more stable, and the clamp 1 can be fixed on the electrode before processing the electrode, so that the relative position of the clamp 1 and the electrode is fixed, which is convenient for positioning as a whole during electrospark machining, and the operation is more convenient and accurate. At the same time, the polygonal positioning column 12 is more convenient to cooperate with the clamping mechanism of the equipment, locate the axial position of the clamp 1 and the electrode, and simplify the proofreading steps.

[0027] Furthermore, a clamping protrusion 13 extends upward from the top of the clamp 1 , and an inverted conical clamping surface 14 is formed on the outer periphery of the clamping protrusion 13 .

[0028] As shown in the accompanying drawings, the clamping protrusion 13 is located above the positioning column 12, and its protrusion is an inverted cone with a larger upper part and a smaller lower part. The clamping surface 14 on its outer periphery is a conical surface. When a radial contraction force is applied to the clamping surface 14, the entire clamp 1 can be clamped and has a tendency to be lifted up as a whole and smoothly, which facilitates accurate positioning.

[0029] Furthermore, it also includes a main body 2, which is provided with a clamping shaft 20 on the top, a clamping cavity 21 in the middle, and a receiving cavity 22 that cooperates with the positioning column 12 at the bottom, and two clamping blocks 23 that can be relatively moved and fixed are installed in the clamping cavity 21. The opposite surfaces of the two clamping blocks 23 are recessed and surrounded to form a through cavity 24 that can accommodate and clamp the clamping protrusion 13, and a connecting hole 25 that communicates with the receiving cavity 22 is opened below the clamping cavity 21.

[0030] As shown in the accompanying drawings, the clamping shaft 20 is used to connect with the equipment, and the clamp 1 is installed in the accommodating cavity 22 from bottom to top, and its clamping protrusion 13 enters the through cavity 24 from the connecting hole 25 upward. At this time, the two clamping blocks 23 in the clamping cavity 21 are separated. After the clamping protrusion 13 enters, the two clamping blocks 23 are relatively moved, so that the clamping protrusion 13 enters the through cavity 24, and the clamping protrusion 13 is clamped and fixed, so that the two clamping blocks 23, the clamp 1 and the electrode connected to the clamp 1 can be connected as a whole. At the same time, due to the cooperation between the inner wall of the accommodating cavity 22 and the positioning column 12, the clamp 1, the electrode and the main body 2 are connected into a whole with a stable relative position. After the whole is installed in the equipment, it is convenient to simplify the calibration operation. The main body 2 does not need to be removed after being installed on the equipment, and only needs to be disassembled and assembled according to the needs. The clamp 1 can be matched with electrodes of different shapes, so this split structure tooling fixture greatly simplifies the calibration steps of the processing and can comprehensively improve the production and processing efficiency.

[0031] Furthermore, the clamping blocks 23 have coaxial holes 231 formed therein opposite to each other and are connected via fasteners.

[0032] As shown in the drawings, the coaxial holes 231 are located above the clamping block 23 . After the fastener passes through the two coaxial holes 231 , it will not touch the clamping protrusion 13 . The fastener is tightened to fix the clamping protrusion 13 in the through cavity 24 .

[0033] Furthermore, the cross section of the positioning column 12 is quadrilateral or hexagonal.

[0034] As shown in the drawings, the surface of the positioning column 12 with a polygonal cross section matches the inner wall of the accommodating cavity 22, wherein a quadrilateral or hexagonal shape is easier to process and install.

[0035] Furthermore, a protrusion 26 cooperating with the clamping surface 14 is laterally extended from the opposite surface of the clamping block 23 , and a pressing surface 15 that can press against the edge of the accommodating cavity 22 is provided at the lower side of the clamp 1 .

[0036] As shown in the accompanying drawings, the protrusion 26 is located below the relative concave surfaces of the two clamping blocks 23 and is formed by relative transverse extension. Its upper surface is an inclined surface that matches the inverted cone clamping surface 14, and its inclination is equal to or greater than the clamping surface 14, so that it can be easily extended below the clamping surface 14. During the relative clamping process, the clamping protrusion 13 can be pushed upward in the through cavity 24, so that the two protrusions 26 can clamp the clamping surface 14 in a relatively movable manner. Due to the inverted cone design, the clamp 1 moves upward under the clamping force until the abutting surface 15 at the bottom of the clamp 1 presses against the edge of the accommodating cavity 22, so that the clamp 1, the electrode and the main body 2 can be accurately positioned. The bottom surface of the main body 2 is flat and can be directly used to abut against the abutting surface 15.

[0037] Furthermore, the clamping cavity 21 is disposed in the middle of the main body 2 and is transversely penetrated.

[0038] As shown in the drawings, this through arrangement can facilitate the installation, inspection and maintenance of the two clamping blocks 23 from both the front and rear directions.

[0039] Furthermore, a spring 3 is installed on the opposite surface of the clamping block 23 .

[0040] As shown in the drawings, the relatively installed springs 3 can enable the two clamping blocks 23 to be relatively elastically clamped and installed, so that the clamping force on the clamping protrusion 13 is more stable.

[0041] Furthermore, a pair of spring holes 26 for installing the spring 3 are provided on both sides of the opposite surfaces of the clamping block 23 .

[0042] As shown in the accompanying drawings, after the springs are installed in the spring holes 26, by tightening the middle fastener, the springs 3 on both sides can make the elasticity of the two clamping blocks 23 more stable, further improving the stability of the clamping force.

[0043] Furthermore, a reference surface 28 is provided below the main body 2 .

[0044] As shown in the drawings, the reference surface 28 is located at the lower left corner of the main body 2, which is convenient for alignment, measurement and positioning.

[0045] In the detailed description of the present utility model, the terms "upper", "lower", "left", "right", "front", "back" and the like indicate the position or positional relationship of the operator when using the present utility model, which is only for the convenience of describing the present utility model, and does not indicate or imply that the equipment or components referred to must have a specific position or positional relationship, and therefore cannot be understood as a limitation on the present utility model. It can be understood that the above embodiments only express the preferred implementation of the present utility model, and the description thereof is relatively specific and detailed, but it cannot be understood as a limitation on the patent scope of the present utility model; it should be pointed out that for ordinary technicians in this field, without departing from the concept of the present utility model, the above technical features can be freely combined, and several deformations and improvements can be made, which all belong to the protection scope of the present utility model; therefore, all equivalent changes and modifications made to the claims and scope of the present utility model should belong to the coverage of the claims of the present utility model.

Claims

1. An electric spark fixture, characterized in that: The invention comprises a clamp (1), wherein the clamp (1) is provided with a through hole (11) extending upwardly and downwardly, and a polygonal positioning column (12) is formed in the middle of the clamp (1); a clamping protrusion (13) extends upwardly from the top of the clamp (1), and a clamping surface (14) in the shape of an inverted cone is formed on the outer periphery of the clamping protrusion (13); and a main body (2), wherein a clamping shaft (20) is provided on the top of the main body (2), a clamping cavity (21) is provided in the middle, and a receiving cavity (22) is provided at the bottom to match the positioning column (12), two clamping blocks (23) are installed in the clamping cavity (21) so as to be relatively movable and fixed, and the opposing surfaces of the two clamping blocks (23) are recessed and, when closed, form a through cavity (24) capable of accommodating and clamping the clamping protrusion (13), and a connecting hole (25) communicating with the receiving cavity (22) is provided below the clamping cavity (21).

2. The electric spark fixture according to claim 1, characterized in that: The clamping blocks (23) have coaxial holes (231) formed opposite to each other and are connected via fasteners.

3. The electric spark fixture according to claim 1, characterized in that: The cross section of the positioning column (12) is quadrilateral or hexagonal.

4. The electric spark fixture according to claim 1, characterized in that: A protrusion (26) that cooperates with the clamping surface (14) extends laterally from the opposite surface of the clamping block (23), and a pressing surface (15) that can press against the edge of the accommodating cavity (22) is provided below the clamp (1).

5. The electric spark fixture according to claim 1, characterized in that: The clamping cavity (21) is arranged in the middle of the main body (2) and is transversely penetrated.

6. The electric spark fixture according to claim 1, characterized in that: A spring (3) is installed on the opposite surface of the clamping block (23).

7. The electric spark fixture according to claim 6, characterized in that: A pair of spring holes (27) for mounting the spring (3) are provided on both sides of the opposite surfaces of the clamping block (23).

8. The electric spark fixture according to claim 6, characterized in that: A reference surface (28) is provided below the main body (2).

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