An EDM fixture

Abstract

This utility model relates to the field of machining fixture technology and discloses an EDM fixture, including a machining table. Two sets of positioning fixtures are arranged above the machining table, and a fixed L-shaped plate is vertically arranged on one side of the upper surface of each positioning fixture. This EDM fixture features optimized design for workpiece protection and ease of use. The mating block on the top surface of the rubber pad and the slot on the bottom surface of the force-applying plate adopt a plug-in structure, allowing operators to quickly disassemble and replace the rubber pad by hand. The rubber material itself has good elasticity and wear resistance, and can buffer the clamping force through its own deformation, avoiding indentations or damage to the workpiece surface due to rigid contact. Furthermore, rubber pads of different hardness, thickness, or surface texture can be flexibly replaced according to the workpiece material's hardness, surface finish, and other requirements, ensuring clamping stability and broadening the fixture's adaptability to different types of workpieces, greatly improving the equipment's flexibility.

Description

Technical Field

[0001] This utility model relates to the field of machining fixture technology, specifically an electrical discharge machine fixture. Background Technology

[0002] An electrical discharge machine is a device that uses electrical discharge to process workpieces. During the processing, the workpiece needs to be fixed by a fixture to ensure processing accuracy and stability. The existing patent document CN221336996U discloses an EDM (Electrical Discharge Machining) fixture. This utility model sets up two clamping structures and a rotating structure. By rotating the first threaded rod, two L-shaped plates clamp and fix the workpiece. Then, the motor is started to rotate the workpiece to the EDM machining area. During the EDM machining process, the workpiece is fixed on the other clamping structure. After the workpiece is processed, the motor is started again to rotate another workpiece to the EDM machining area. At this time, during the EDM machining process, the processed workpiece is unloaded, so that the loading and unloading time of the workpiece overlaps with the EDM machining time, thereby improving the machining efficiency of the EDM.

[0003] However, existing EDM fixtures have significant shortcomings in workpiece protection and ease of use. Their clamping components lack a cushioning structure similar to a rubber pad, relying on rigid contact to fix the workpiece. During clamping, improper clamping force control can easily lead to indentations or damage to the workpiece surface. This rigid clamping method severely impacts workpiece quality, especially for workpieces requiring high surface finish or made of soft materials. Furthermore, the fixed clamping structure of existing fixtures cannot be flexibly adjusted according to different workpiece material hardness, surface finish, or other requirements. The lack of easily replaceable pluggable cushioning components means that when adapting to different types of workpieces, it's impossible to optimize the clamping effect by replacing cushioning components with those of different hardness, thickness, or surface texture. This not only limits the fixture's adaptability to diverse workpieces but also reduces the equipment's flexibility. Operators must spend more time adjusting or taking additional protective measures to meet different processing needs, impacting overall processing efficiency. Utility Model Content

[0004] Technical problems to be solved The purpose of this utility model is to provide an electrical discharge machine fixture to solve the problem mentioned in the background art that the existing electrical discharge machine fixtures have obvious deficiencies in workpiece protection and ease of use.

[0005] (II) Technical Solution To achieve the above objectives, this utility model provides the following technical solution: an EDM fixture, comprising a processing table, with two sets of positioning fixtures arranged above the processing table. A fixed L-shaped plate is vertically arranged on one side of the upper surface of the positioning fixture, and a movable L-shaped plate is arranged above the positioning fixture in a mirror image of the fixed L-shaped plate. A first electric telescopic rod is installed through the middle of the parallel sections of the fixed L-shaped plate and the movable L-shaped plate. A force-applying plate is fixedly connected to the transmission end of the bottom end of the first electric telescopic rod. A rubber pad is arranged below the force-applying plate, and a mating block is integrally formed on the top surface of the rubber pad. The mating block is movably inserted into a slot pre-set on the bottom surface of the force-applying plate.

[0006] As a further improvement to the above solution, the upper surface of the processing table is provided with a long groove for receiving, and a drive motor is installed on one side inside the long groove.

[0007] As a further improvement to the above solution, a lead screw is fixedly connected to the transmission end of the drive motor, and the end of the lead screw away from the drive motor is connected to the inner wall of the other end of the accommodating long groove through a bearing.

[0008] As a further improvement to the above solution, the outer surface of the lead screw is connected to two internally threaded L-shaped plates by thread, and each set of positioning fixtures is installed at the top of the parallel surface of each internally threaded L-shaped plate.

[0009] As a further improvement to the above solution, a slider is connected to the middle of the bottom end of the parallel surface of each of the internally threaded L-shaped plates, and a sliding groove parallel to the accommodating long groove is opened in the middle of the upper surface of the processing table, and the slider is slidably connected to the sliding groove.

[0010] As a further improvement to the above solution, a fixed support plate is provided on the side of the upper surface of the positioning fixture away from the fixed L-shaped plate, and a second electric telescopic rod is horizontally passed through the middle of the fixed support plate. The movable L-shaped plate is fixedly connected to the transmission end of the second electric telescopic rod.

[0011] Compared with the prior art, the beneficial effects of this utility model are: 1. This EDM fixture has been optimized in terms of workpiece protection and ease of use. The mating block on the top surface of the rubber pad and the slot on the bottom surface of the force plate adopt a plug-in structure, which allows operators to quickly disassemble and replace the rubber pad by hand. The rubber material itself has good elasticity and wear resistance, and can buffer the clamping force through its own deformation, avoiding indentations or damage to the workpiece surface due to rigid contact. At the same time, rubber pads with different hardness, thickness or surface texture can be flexibly replaced according to the workpiece material hardness, surface finish and other requirements, which not only ensures clamping stability, but also broadens the range of adaptability of the fixture to different types of workpieces, and greatly improves the flexibility of the equipment. 2. This EDM fixture uses a drive motor to provide stable power, combined with the precision thread transmission of the lead screw and the internal thread L-shaped plate, and guided and limited by the slider and the slide groove, to achieve synchronous and smooth movement of two sets of positioning fixtures along the horizontal direction of the machining table. This structural design ensures that each set of positioning fixtures can move precisely and alternately under the machining head. When one set of workpieces is being processed, the operator can simultaneously load and unload workpieces on the other set of positioning fixtures, eliminating the downtime waiting time in traditional single-fixture processing, greatly shortening the processing gap, and significantly improving the overall processing efficiency of batch workpieces, making it especially suitable for large-scale production scenarios. 3. This EDM fixture achieves stable fixation of the workpiece through a multi-clamping structure. The second electric telescopic rod on the fixed support plate can precisely drive the movable L-shaped plate to move laterally, forming a symmetrical lateral clamping force with the fixed L-shaped plate. At the same time, the first electric telescopic rod on the fixed L-shaped plate and the movable L-shaped plate can synchronously drive the force application plate and the rubber pad to move longitudinally downward, forming a vertical clamping force. This three-dimensional fixation method limits the workpiece from multiple dimensions in the lateral and longitudinal directions, which can effectively offset the vibration and impact force generated during EDM, avoid workpiece displacement or shaking, ensure that the processing trajectory is highly consistent with the preset program, and significantly improve the processing accuracy and dimensional consistency of complex workpieces. Attached Figure Description

[0012] Figure 1 This is a three-dimensional structural diagram of the present invention; Figure 2 This is a partial three-dimensional structural diagram of the processing table of this utility model; Figure 3 This is a three-dimensional structural diagram of the positioning clamp of this utility model; Figure 4 This is a three-dimensional structural diagram of the force-applying plate and rubber pad of this utility model.

[0013] In the diagram: 1. Machining table; 2. Positioning fixture; 3. Fixed L-shaped plate; 4. Movable L-shaped plate; 5. Electric telescopic rod No. 1; 6. Force plate; 7. Rubber pad; 8. Connecting block; 9. Long slot for receiving; 10. Drive motor; 11. Lead screw; 12. Internally threaded L-shaped plate; 13. Slider; 14. Slide groove; 15. Fixed support plate; 16. Electric telescopic rod No. 2. Detailed Implementation

[0014] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0015] Please see Figure 1 - Figure 4 This utility model provides a technical solution: an EDM fixture, including a processing table 1, two sets of positioning fixtures 2 are arranged above the processing table 1, a fixed L-shaped plate 3 is vertically arranged on one side of the upper surface of the positioning fixture 2, a movable L-shaped plate 4 is arranged above the positioning fixture 2 in a mirror distribution with the fixed L-shaped plate 3, a first electric telescopic rod 5 is installed through the middle of the parallel section of the fixed L-shaped plate 3 and the movable L-shaped plate 4, a force-applying plate 6 is fixedly connected to the transmission end of the bottom end of the first electric telescopic rod 5, a rubber pad 7 is arranged below the force-applying plate 6, a docking plug 8 is integrally formed on the top surface of the rubber pad 7, and the docking plug 8 is movably inserted into the slot preset on the bottom surface of the force-applying plate 6.

[0016] The first electric telescopic rod 5, installed on the horizontal section of the fixed L-shaped plate 3 and the movable L-shaped plate 4, starts synchronously. The piston rod drives the force plate 6 to move vertically downward until the rubber pad 7 contacts the upper surface of the workpiece. The rubber pad 7 forms a reliable connection with the bottom slot of the force plate 6 through the docking block 8 on the top surface. Its elastic material produces a slight deformation when under pressure, which increases the friction with the workpiece and avoids surface damage caused by rigid contact through deformation buffer. The first electric telescopic rod 5 automatically adjusts the telescopic amount according to the thickness of the workpiece to ensure that the longitudinal pressure is evenly applied to the surface of the workpiece, realizing three-dimensional fastening. The operator can quickly disassemble the finished workpiece during the processing interval, replace the worn rubber pad 7 through the plug-in structure, and re-clamp the new workpiece, forming a parallel operation mode of "processing-loading and unloading", which greatly shortens the equipment idle time.

[0017] The upper surface of the processing table 1 is provided with a long groove 9. A drive motor 10 is installed on one side inside the long groove 9. A lead screw 11 is fixedly connected to the transmission end of the drive motor 10. The end of the lead screw 11 away from the drive motor 10 is connected to the inner wall of the other end of the long groove 9 through a bearing. Two internally threaded L-shaped plates 12 are connected to the outer surface of the lead screw 11 by threads. Each set of positioning fixtures 2 is installed at the top of the parallel surface of each internally threaded L-shaped plate 12. A slider 13 is connected to the middle of the bottom end of the parallel surface of each internally threaded L-shaped plate 12. A sliding groove 14 parallel to the long groove 9 is provided in the middle of the upper surface of the processing table 1. The slider 13 is slidably connected to the sliding groove 14. A fixed support plate 15 is provided on the side of the upper surface of the positioning fixture 2 away from the fixed L-shaped plate 3. A second electric telescopic rod 16 is horizontally passed through the middle of the fixed support plate 15. The movable L-shaped plate 4 is fixedly connected to the transmission end of the second electric telescopic rod 16.

[0018] After the equipment is started, the drive motor 10 in the long groove 9 inside the processing table 1 receives the control signal. The output shaft of the drive motor 10 drives the lead screw 11 to rotate precisely along the bearing seat. Since the thread on the outer surface of the lead screw 11 and the two internal thread L-shaped plates 12 form a helical pair transmission, and the slider 13 at the bottom of the internal thread L-shaped plate 12 is embedded in the groove 14 on the surface of the processing table 1 to form a guiding constraint, the two sets of positioning fixtures 2 move synchronously along the axis of the long groove 9 with the internal thread L-shaped plate 12. Through the position signal fed back by the encoder, it is ensured that one set of positioning fixtures 2 is accurately stopped at the processing position directly below the processing head. During the workpiece clamping stage, the operator places the workpiece to be processed on the bearing plane of the positioning fixture 2, so that one side of the workpiece is in contact with the bearing. When the vertical section of the fixed L-shaped plate 3 is fixed, the second electric telescopic rod 16 on the fixed support plate 15 is energized, and its piston rod pushes the movable L-shaped plate 4 to slide along the surface of the positioning fixture 2. The movable L-shaped plate 4 and the vertical section of the fixed L-shaped plate 3 form a symmetrical clamping surface to achieve the lateral positioning of the workpiece. Then, the first electric telescopic rod 5 is activated, and the piston rod drives the force plate 6 to move vertically downward to ensure that the longitudinal pressure is evenly applied to the surface of the workpiece, achieving three-dimensional fastening. During the processing, when the workpiece in the processing position is completed, the drive motor 10 rotates in the reverse direction and drives the two sets of positioning fixtures 2 to switch positions through the lead screw 11, so that the other set of clamped workpieces moves to the processing position. At the same time, the processed workpiece exits the processing area with the positioning fixture 2.

[0019] Working principle: After the equipment is started, the drive motor 10 in the long groove 9 inside the processing table 1 receives the control signal. The output shaft of the drive motor 10 drives the lead screw 11 to rotate precisely along the bearing seat. Since the thread on the outer surface of the lead screw 11 and the two internal thread L-shaped plates 12 form a helical pair transmission, and the slider 13 at the bottom of the internal thread L-shaped plate 12 is embedded in the groove 14 on the surface of the processing table 1 to form a guiding constraint, the two sets of positioning fixtures 2 move synchronously along the axis of the long groove 9 with the internal thread L-shaped plate 12. The position is fed back by the encoder. A signal is set to ensure that one set of positioning fixtures 2 is accurately positioned at the machining position directly below the machining head. During the workpiece clamping stage, the operator places the workpiece to be processed on the bearing plane of the positioning fixture 2, so that one side of the workpiece is in contact with the vertical section of the fixed L-shaped plate 3. At this time, the second electric telescopic rod 16 on the fixed support plate 15 is energized, and its piston rod pushes the movable L-shaped plate 4 to slide along the surface of the positioning fixture 2. The movable L-shaped plate 4 and the vertical section of the fixed L-shaped plate 3 form a symmetrical clamping surface, realizing the lateral positioning of the workpiece. Immediately afterwards, the fixed L-shaped plate 3 and the movable L-shaped plate 2... The first electric telescopic rod 5, installed on the horizontal section of the L-shaped plate 4, starts synchronously. The piston rod drives the force plate 6 to move vertically downward until the rubber pad 7 contacts the upper surface of the workpiece. The rubber pad 7 forms a reliable connection with the bottom slot of the force plate 6 through the docking block 8 on the top surface. Its elastic material produces a slight deformation when under pressure, which increases the friction with the workpiece and avoids surface damage caused by rigid contact through deformation buffer. The first electric telescopic rod 5 automatically adjusts the telescopic amount according to the thickness of the workpiece to ensure that the longitudinal pressure is evenly applied to the surface of the workpiece, realizing three-dimensional fastening. During the processing, when the workpiece in the processing position is completed, the drive motor 10 rotates in reverse and drives the two sets of positioning fixtures 2 to switch positions through the lead screw 11, so that the other set of clamped workpieces moves to the processing position. At the same time, the processed workpiece is removed from the processing area with the positioning fixture 2. The operator can quickly disassemble the finished workpiece during the processing interval, replace the worn rubber pad 7 through the plug-in structure, and re-clamp the new workpiece, forming a parallel operation mode of "processing-loading and unloading", which greatly shortens the idle time of the equipment.

[0020] Finally, it should be noted that the above content is only used to illustrate the technical solution of this utility model, and is not intended to limit the scope of protection of this utility model. Simple modifications or equivalent substitutions made by those skilled in the art to the technical solution of this utility model do not depart from the essence and scope of the technical solution of this utility model.

Claims

1. An electric spark machine fixture comprising a machining table (1), characterized in that: Two sets of positioning fixtures (2) are provided above the processing table (1). A fixed L-shaped plate (3) is vertically provided on one side of the upper surface of the positioning fixture (2). A movable L-shaped plate (4) is provided above the positioning fixture (2) and is distributed in a mirror image of the fixed L-shaped plate (3). A first electric telescopic rod (5) is installed through the middle of the parallel section of the fixed L-shaped plate (3) and the movable L-shaped plate (4). A force-applying plate (6) is fixedly connected to the transmission end of the bottom end of the first electric telescopic rod (5). A rubber pad (7) is provided below the force-applying plate (6). A docking plug (8) is integrally formed on the top surface of the rubber pad (7). The docking plug (8) is movably inserted into the slot preset on the bottom surface of the force-applying plate (6).

2. An electrode discharge machine jig according to claim 1, characterized by: The upper surface of the processing table (1) is provided with a long groove (9), and a drive motor (10) is installed on one side inside the long groove (9).

3. An electrode discharge machine jig according to claim 2, wherein: The drive motor (10) is fixedly connected to a lead screw (11), and the end of the lead screw (11) away from the drive motor (10) is connected to the inner wall of the other end of the accommodating long groove (9) through a bearing.

4. An electrode discharge machine jig according to claim 3, wherein: The outer surface of the lead screw (11) is connected to two internally threaded L-shaped plates (12) by thread. Each set of positioning fixtures (2) is installed at the top of the parallel surface of each internally threaded L-shaped plate (12).

5. The EDM fixture according to claim 4, characterized in that: Each of the internally threaded L-shaped plates (12) has a slider (13) connected to the middle of the bottom of the parallel surface. The upper surface of the processing table (1) has a groove (14) parallel to the long groove (9). The slider (13) and the groove (14) are slidably connected.

6. An electrode discharge machine jig according to claim 1, characterized by: A fixed support plate (15) is provided on the side of the upper surface of the positioning fixture (2) away from the fixed L-shaped plate (3). A second electric telescopic rod (16) is horizontally passed through the middle of the fixed support plate (15). The movable L-shaped plate (4) is fixedly connected to the transmission end of the second electric telescopic rod (16).

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