Micro-precision discharge mirror surface processing machine

Abstract

This utility model discloses a micro-precision EDM mirror surface processing machine, relating to the technical field of EDM equipment. It includes a mirror EDM machine and a filter box. The filter box is divided into a first chamber and a second chamber by a partition. A through-slot at the upper end of the partition forms an overflow guide. A coarse filter screen is movably placed above the first chamber via a horizontal frame. A water channel plate with a matrix-style drain outlet is located directly above the first chamber. The water channel plate is connected to the return port of the mirror EDM processing tank via a return pipe. A strong magnetic rod assembly is installed at the bottom of the first chamber. A fine filter screen is movably placed in the second chamber via a diagonal support frame. An outlet pipe and an inlet pipe are located on the side wall. A removable cover is provided at the top of the filter box, and a drain outlet is located at the bottom of the first chamber. This utility model ensures the cleanliness of the processing fluid and improves processing accuracy through a three-stage filtration process of "coarse filtration + strong magnetic adsorption + fine filtration." The filter screen is easy to install and remove, and the processing fluid circulation is stable. It is suitable for mirror-level EDM processing of materials such as mold steel and hard alloys, combining practicality and economy.

Description

Technical Field

[0001] This utility model relates to the field of electrical discharge machining equipment technology, specifically a micro-precision electrical discharge mirror processing machine. Background Technology

[0002] In modern manufacturing, mirror EDM machines (micro-precision EDM machines) are core equipment for achieving mirror-level surface finish on metal workpieces (typically requiring a surface roughness Ra ≤ 0.05 μm). They are widely used in mold manufacturing, precision machinery, medical devices, and other fields. Through the principle of high-frequency narrow-pulse discharge, they create tiny, instantaneous high temperatures between the electrode and the workpiece, achieving micro-level material removal while ensuring the smoothness of the processed surface. However, the processing generates a large number of impurities (such as metal chips, electrode wear residue, and metal oxide particles). If these impurities mix with the processing fluid (usually insulating mineral oil or specialized EDM fluid) and are not removed promptly and effectively, they will seriously affect the processing quality and equipment lifespan, becoming a key bottleneck restricting the development of mirror finishing technology.

[0003] Traditional machining fluid filtration systems are inefficient and fail to thoroughly remove impurities. Existing mirror EDM machines often employ a purification method of "single filter + simple sedimentation," which is ineffective against 1-20μm fine ferromagnetic particles (such as Fe3O4) and carbide particles generated during EDM. These fine impurities, after circulating back to the machining area with the machining fluid, interfere with the stability of the discharge gap between the electrode and the workpiece, leading to problems such as "secondary discharge" and "carbon buildup." This results in scratches and pitting on the workpiece surface, failing to achieve mirror-level finish (Ra value often deteriorates to above 0.2μm). Especially in machining complex curved surfaces such as mold cavities, impurity accumulation can also cause uneven discharge, affecting molding accuracy.

[0004] As the manufacturing industry continues to demand higher workpiece surface quality and processing efficiency, traditional mirror EDM machining fluid filtration systems are no longer sufficient to meet actual production needs. Therefore, developing a high-efficiency, stable, easy-to-maintain, and highly adaptable machining fluid filtration system has become a pressing technical challenge in the field of micro-precision EDM mirror machining equipment.

[0005] Therefore, those skilled in the art have provided a micro-precision electrical discharge mirror processing machine to solve the problems mentioned in the background art. Utility Model Content

[0006] The purpose of this invention is to provide a micro-precision discharge mirror processing machine to solve the problems mentioned in the background art.

[0007] To achieve the above objectives, this utility model provides the following technical solution:

[0008] A micro-precision EDM mirror finishing machine includes a mirror EDM machine. A filter box is provided on one side of the mirror EDM machine. A partition is fixedly installed inside the filter box, dividing the inner cavity of the filter box into a first chamber and a second chamber. A through groove is provided at the upper end of the partition. Horizontal frames are fixedly installed on the inner walls of both sides above the first chamber inside the filter box. The upper end of the horizontal frames is flush with the top of the partition. A coarse filter screen is movably placed on the horizontal frames. A strong magnetic rod assembly, composed of multiple neodymium iron boron magnetic rods, is installed at the bottom of the first chamber. Inclined supports are provided on the inner walls of both sides of the second chamber. The side of the inclined supports away from the partition is slightly inclined downwards. A fine filter screen is movably placed on the inclined supports.

[0009] As a further embodiment of this utility model: a water channel plate is provided in the first chamber above the coarse filter screen. The water channel plate is a rectangular hollow structure and is fixed to the inner wall of the filter box by fixing strips.

[0010] As a further improvement of this utility model: the bottom of the water circuit board is provided with a plurality of drainage outlets arranged in a matrix, and a return pipe is fixedly connected to one side of the water circuit board. The input end of the return pipe extends through to the outside of the filter box and is connected to the return port at the bottom of the processing tank of the mirror EDM machine.

[0011] As a further improvement of this utility model: a liquid outlet pipe and a liquid inlet pipe are fixedly connected to one side of the filter box. The liquid outlet pipe is a flexible tube that communicates with the second chamber and is connected to the processing fluid injection system of the mirror EDM machine through an external pump body.

[0012] As a further embodiment of this utility model: the liquid inlet pipe is connected to the second chamber and is located below the fine filter screen. The liquid inlet pipe is connected to an external processing fluid storage device through an external pump body, and a solenoid valve is installed on the liquid inlet pipe.

[0013] As a further embodiment of this utility model: the upper end of the filter box is an open end, and a box cover is detachably installed by bolts. A drain port is fixedly connected to the bottom side of the filter box, and a sealing cap is threaded onto the drain port. The drain port is connected to the bottom of the first chamber.

[0014] As a further improvement of this utility model, the multiple neodymium iron boron magnets of the strong magnet group are arranged in parallel and spaced apart.

[0015] As a further improvement of this utility model, the edges of both the coarse and fine filter screens are provided with supporting edges that are compatible with the horizontal and inclined support frames.

[0016] Compared with the prior art, the beneficial effects of this utility model are:

[0017] This invention effectively solves the problem of decreased machining accuracy caused by incomplete filtration of traditional mirror EDM machining fluid. The three-stage progressive filtration structure of "coarse filtration + strong magnetic adsorption + fine filtration" in the filter box complements each other: the 80-mesh coarse filter first intercepts large particles with a diameter >0.18mm to avoid pipeline blockage; the strong magnetic rod group captures ferromagnetic particles of 1-20μm to prevent them from interfering with discharge stability; the fine filter further traps fine metal dust and carbides, which significantly improves the cleanliness of the circulating machining fluid and avoids defects such as "secondary discharge" and "carbon buildup". It is especially suitable for the mirror-grade machining needs of materials such as mold steel and cemented carbide. Secondly, it significantly improves filtration efficiency and processing fluid circulation stability. The matrix-style drain outlets of the water circuit board inside the filter box ensure that the processing fluid is evenly dispersed on the surface of the coarse filter screen, avoiding local filtration overload. The inclined support frame of the second chamber increases the contact area between the fine filter screen and the processing fluid, and facilitates the sliding of impurities to the lower end, reducing the probability of filter screen clogging. In addition, the overall structure adopts a highly adaptable design, which is convenient for installation and debugging and is compatible with different models of mirror EDM machines. It effectively makes up for the shortcomings of traditional equipment such as simple filtration structure, cumbersome maintenance and unstable processing accuracy, and provides an efficient, stable and economical solution for micro-precision EDM mirror processing. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the overall structure of a micro-precision electrical discharge mirror processing machine.

[0019] Figure 2 This is a schematic diagram of the internal structure of the filter box in a micro-precision discharge mirror processing machine.

[0020] Figure 3 This is a schematic diagram of the horizontal frame and diagonal support frame in a micro-precision electrical discharge mirror processing machine.

[0021] Figure 4 This is a cross-sectional view of a filter box in a micro-precision discharge mirror processing machine.

[0022] In the diagram: 1. Mirror EDM machine; 2. Filter box; 3. Box cover; 4. Partition; 5. Through groove; 6. Horizontal frame; 7. Diagonal support frame; 8. Coarse filter screen; 9. Fine filter screen; 10. Water circuit board; 11. Drain outlet; 12. Return pipe; 13. Sewage outlet; 14. Sealing cover; 15. Outlet pipe; 16. Inlet pipe; 17. Solenoid valve; 18. Fixing strip; 19. Strong magnetic rod assembly. Detailed Implementation

[0023] 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.

[0024] Reference Figures 1-4 This embodiment provides a micro-precision EDM mirror surface processing machine, including a mirror EDM machine 1. A filter box 2 is fixedly placed on one side of the mirror EDM machine 1. The filter box 2 has a rectangular structure. The upper end of the filter box 2 is an open end, and a box cover 3 is detachably installed by bolts. A rubber sealing ring is pasted on the inner edge of the box cover 3. When closed, the filter box 2 can be sealed to prevent the processing fluid from evaporating and external impurities from entering.

[0025] A partition plate 4 is vertically fixed inside the filter box 2. The partition plate 4 is connected to the inner wall and bottom of the filter box 2 by full welding, dividing the inner cavity of the filter box 2 into two independent chambers (the first chamber and the second chamber). A through groove 5 is opened at the center of the upper end of the partition plate 4. The inner wall of the through groove 5 is rounded to avoid the generation of eddies when the processing fluid flows through it. The distance between the lower edge of the through groove 5 and the top of the partition plate 4 is 5cm, forming an "overflow" guiding structure. Only when the liquid level of the processing fluid in the first chamber reaches the lower edge of the through groove 5 can it flow into the second chamber through the through groove 5, ensuring the filtration time of the processing fluid in the first chamber.

[0026] Inside the filter box 2, horizontal frames 6 are symmetrically fixed to the inner walls on both sides above the first chamber by bolts. The upper surface of the horizontal frames 6 is flush with the top of the partition 4, providing stable support for the coarse filter screen 8. A silicone anti-slip pad is attached to the upper surface of the horizontal frames 6 to prevent the coarse filter screen 8 from shifting under the impact of the processing fluid. The coarse filter screen 8 is movably placed on the horizontal frames 6. The coarse filter screen 8 is made of 304 stainless steel woven mesh with a mesh count of 80 mesh and a stainless steel rectangular frame. It can intercept metal debris (such as iron filings and copper filings) and electrode wear residue with a diameter >0.18mm in the processing fluid.

[0027] On the inner walls of both sides of the second chamber, inclined support frames 7 are welded and fixed. The side of the inclined support frame 7 away from the partition plate 4 is slightly inclined downward. This inclined structure can increase the contact area between the fine filter screen 9 and the processing fluid, and at the same time facilitate the accumulation of impurities on the surface of the fine filter screen 9, allowing them to slide down to the lower end and reducing filter screen clogging. The fine filter screen 9 is movably placed on the inclined support frame 7. The fine filter screen 9 adopts a multi-layer composite filter material (the bottom layer is stainless steel mesh, the middle layer is polypropylene meltblown cloth, and the top layer is nylon mesh), and the overall filtration accuracy can reach 10μm, which can effectively intercept fine metal dust and carbide particles in the processing fluid.

[0028] A water channel plate 10 is located directly above the coarse filter screen 8 within the first chamber. The water channel plate 10 has a rectangular hollow structure and is fixedly connected to the inner wall of the filter box 2 by fixing strips 18, maintaining a distance between the water channel plate 10 and the coarse filter screen 8. This ensures that the processing liquid, after flowing out of the water channel plate 10, can be evenly dispersed on the surface of the coarse filter screen 8. Several drain outlets 11 are evenly distributed at the bottom of the water channel plate 10. The drain outlets 11 are circular holes, which can evenly distribute the processing liquid to various areas of the coarse filter screen 8, avoiding excessive local filtration load and clogging.

[0029] A return pipe 12 is fixedly connected to the middle of one side of the water circuit board 10. The return pipe 12 is a PU flexible hose with good flexibility and oil resistance. Its input end extends through to the outside of the filter box 2 and is connected to the return port at the bottom of the processing tank of the mirror EDM machine 1 through a quick connector.

[0030] The right side wall of the filter box 2 is fixedly connected to an outlet pipe 15 and an inlet pipe 16, both of which are PU flexible tubes. The inlet end of the outlet pipe 15 is connected to the bottom of the second chamber, and the outlet end is connected to the machining fluid injection system of the mirror EDM machine 1 via an external centrifugal pump. The inlet pipe 16 is connected to the bottom of the second chamber, and the outlet end is connected to an external machining fluid storage device via an external gear pump, used to replenish the machining fluid lost in the filter box 2; a solenoid valve 17 is installed on the inlet pipe 16.

[0031] A drain port 13 is fixedly connected to the bottom of the left side wall of the filter box 2. The drain port 13 communicates with the bottom of the first chamber, and a sealing cap 14 is threaded to its end. The outer surface of the sealing cap 14 is provided with anti-slip texture for easy manual unscrewing. The drain port 13 is used to discharge impurities deposited at the bottom of the first chamber. After the impurities are discharged, the sealing cap 14 is closed and an appropriate amount of processing fluid is added.

[0032] A set of strong magnetic rods 19 is uniformly installed at the bottom of the first chamber. The set of strong magnetic rods 19 is composed of multiple neodymium iron boron magnetic rods. The set of strong magnetic rods 19 can "actively capture" ferromagnetic particles that are difficult to see with the naked eye in the processing fluid, preventing such small impurities from entering the second chamber with the processing fluid, reducing the filtration load of the fine filter screen 9, and preventing impurities from flowing back to the processing area of ​​the mirror EDM machine 1 and affecting the discharge stability.

[0033] Before starting the equipment, connect the mirror EDM machine 1 and the filter box 2 through the return pipe 12 and the outlet pipe 15, and ensure that all pipe joints are well sealed. Open the cover 3 of the filter box 2, place the coarse filter screen 8 stably on the horizontal frame 6 of the first chamber, and place the fine filter screen 9 on the inclined support frame 7 of the second chamber. Close the cover 3 and tighten the bolts. Inject the processing fluid into the filter box 2 through the inlet pipe 16.

[0034] The impurity-containing processing fluid generated during the processing of the mirror EDM machine 1 is initially filtered through the return port at the bottom of the processing tank, and then flows into the water circuit plate 10 of the filter box 2 through the return pipe 12. It is then evenly sprayed onto the coarse filter screen 8 through the drain port 11 at the bottom of the water circuit plate 10.

[0035] The processing fluid is filtered through the coarse filter screen 8 and falls into the first chamber. The strong magnetic rod group 19 at the bottom of the first chamber adsorbs the ferromagnetic particles therein. The processing fluid gradually accumulates in the first chamber. When the liquid level reaches the lower edge of the through channel 5, it overflows into the second chamber through the through channel 5.

[0036] The processing fluid entering the second chamber flows through the inclined fine filter screen 9 under the action of gravity, where fine impurities with a diameter >10μm are intercepted and finally fall into the bottom of the second chamber;

[0037] The clean processing fluid at the bottom of the second chamber is pumped back to the processing fluid injection system of the mirror EDM machine 1 through the outlet pipe 15 by an external centrifugal pump, providing cooling and insulation medium for EDM and completing one cycle.

[0038] It will be apparent to those skilled in the art that this invention is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or essential characteristics of this invention. Therefore, the embodiments should be considered illustrative and non-limiting in all respects, and the scope of this invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within this invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0039] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A micro-precision electrical discharge mirror finishing machine, comprising a mirror EDM machine (1), characterized in that, A filter box (2) is provided on one side of the mirror EDM machine (1). A partition (4) is fixedly installed inside the filter box (2). The partition (4) divides the inner cavity of the filter box (2) into a first chamber and a second chamber. A through groove (5) is provided at the upper end of the partition (4). A horizontal frame (6) is fixedly installed on the inner walls of both sides above the first chamber inside the filter box (2). The upper end of the horizontal frame (6) is flush with the top of the partition (4). A coarse filter screen (8) is movably placed on the horizontal frame (6). A strong magnetic rod group (19) is installed at the bottom of the first chamber. The strong magnetic rod group (19) is composed of multiple neodymium iron boron magnetic rods. An inclined support frame (7) is provided on the inner walls of both sides of the second chamber. The side of the inclined support frame (7) away from the partition (4) is slightly inclined downward. A fine filter screen (9) is movably placed on the inclined support frame (7).

2. The micro-precision discharge mirror processing machine according to claim 1, characterized in that, A water channel plate (10) is provided above the coarse filter screen (8) in the first chamber. The water channel plate (10) is a rectangular hollow structure and is fixed to the inner wall of the filter box (2) by a fixing strip (18).

3. The micro-precision discharge mirror processing machine according to claim 2, characterized in that, The bottom of the water circuit board (10) is provided with a number of drainage outlets (11) arranged in a matrix. A return pipe (12) is fixedly connected to one side of the water circuit board (10). The input end of the return pipe (12) extends through to the outside of the filter box (2) and is connected to the return port at the bottom of the processing tank of the mirror EDM machine (1).

4. The micro-precision discharge mirror processing machine according to claim 1, characterized in that, The filter box (2) is fixedly connected to an outlet pipe (15) and an inlet pipe (16) on one side. The outlet pipe (15) is a flexible tube that communicates with the second chamber and is connected to the processing fluid injection system of the mirror EDM machine (1) through an external pump body.

5. The micro-precision discharge mirror processing machine according to claim 4, characterized in that, The inlet pipe (16) is connected to the second chamber and is located below the fine filter screen (9). The inlet pipe (16) is connected to the external processing fluid storage device through an external pump body. A solenoid valve (17) is installed on the inlet pipe (16).

6. The micro-precision discharge mirror processing machine according to claim 1, characterized in that, The upper end of the filter box (2) is an open end, and a box cover (3) is detachably installed by bolts. A drain port (13) is fixedly connected to the bottom of one side of the filter box (2). A sealing cover (14) is threaded onto the drain port (13), and the drain port (13) is connected to the bottom of the first chamber.

7. The micro-precision discharge mirror processing machine according to claim 1, characterized in that, The multiple neodymium iron boron magnets in the strong magnet group (19) are arranged in parallel and spaced apart.

8. The micro-precision discharge mirror processing machine according to claim 1, characterized in that, The edges of both the coarse filter (8) and the fine filter (9) are provided with supporting edges that are compatible with the horizontal frame (6) and the diagonal support frame (7).

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