Multi-electrode electrical discharge machining auxiliary device and electrical discharge machine tool

Abstract

The present application is applicable to the technical field of electric spark discharge machining equipment, and provides a multi-electrode electric spark machining auxiliary device and an electric spark machine tool. The auxiliary device includes a first slider, a second slider, a transmission mechanism and a base. The first slider is provided with a first electrode, and the first slider can be connected to the driving shaft of the electric spark machine tool; the workpiece to be machined can be arranged on the second slider; the transmission mechanism is transmission-connected with the first slider, the second slider and the base; the base is provided with a second electrode and a guide portion, and the first slider and the second slider are arranged on the guide portion. The multi-electrode electric spark machining auxiliary device provided in the present application is connected with the driving shaft at the first slider, and the driving shaft drives the first slider to move along the guide portion, and the first slider drives the transmission mechanism to move, so that the transmission mechanism drives the second slider to move along the guide portion, so that the first electrode and the second electrode are close to the workpiece to be machined on the second slider, so that different surfaces of the workpiece to be machined are subjected to synchronous electric spark machining, thereby improving the machining efficiency.

Description

Technical Field

[0001] The present application relates to the technical field of electric spark discharge machining equipment, and more specifically, to a multi-electrode electric spark machining auxiliary device and an electric spark machine tool. Background Art

[0002] Electrospark machining is to apply a certain pulse voltage between the electrode and the workpiece. When the distance between the workpiece and the electrode is gradually shortened to a certain range, there will be an extremely high-intensity electric field in the gap between the two, and discharge will occur between the workpiece and the electrode. During the discharge, extremely high temperature is generated instantly, which can vaporize the workpiece material. Then, under the flushing action of the working fluid, the removed workpiece material is discharged, thereby achieving the purpose of removing the workpiece material.

[0003] At present, the existing EDM equipment drives the electrode to feed close to the workpiece through its feed shaft to achieve discharge machining. The machining method is single-electrode discharge, resulting in low machining efficiency. In addition, for the machining of complex structures such as variable diameter holes and double-sided structures, they cannot be formed in one time and need to be clamped and repeated for multiple times, which reduces the machining accuracy and efficiency. Summary of the invention

[0004] The purpose of the embodiments of the present application is to provide a multi-electrode electrical discharge machining auxiliary device, which aims to solve the technical problem that the electrical spark discharge machining equipment in the prior art uses a single-electrode discharge method, resulting in low machining efficiency.

[0005] To achieve the above-mentioned purpose, the technical solution adopted in this application is: to provide a multi-electrode discharge machining auxiliary device for use on an electric spark machine tool, comprising:

[0006] A first slider, on which a first electrode is disposed, and the first slider can be connected to a driving shaft of the electric spark machine tool;

[0007] a second slide block, on which the workpiece to be processed can be arranged;

[0008] A base, wherein the base is provided with a second electrode and a guide portion, and the first slider and the second slider are provided on the guide portion;

[0009] A transmission mechanism is connected to the first slider, the second slider and the base, the driving shaft drives the first slider to move along the guide portion, the first slider drives the transmission mechanism to move, and the transmission mechanism drives the second slider to move along the guide portion, so that the first electrode and the second electrode can perform electrical discharge machining on the workpiece to be machined.

[0010] Furthermore, the transmission mechanism comprises:

[0011] a first connecting rod, the first connecting rod being hinged to the first sliding block;

[0012] a second connecting rod, the second connecting rod being hinged to the first connecting rod and the second sliding block respectively;

[0013] A third connecting rod is hinged to the base and the first connecting rod respectively.

[0014] Furthermore, the multi-electrode discharge machining auxiliary device also includes a slide rail, a third slider and a third electrode, the third slider is arranged on the third connecting rod, and the third electrode is arranged on the third slider, the slide rail is connected to the second slider, the third slider is sleeved on the slide rail, and the third connecting rod drives the third slider to move along the slide rail so that the third electrode is close to or away from the workpiece to be processed.

[0015] Furthermore, the number of the third slider and the third electrode is multiple, and the transmission mechanism further includes:

[0016] a fourth connecting rod, the fourth connecting rod being hinged to the first sliding block;

[0017] A fifth connecting rod is hinged to the base and the fourth connecting rod, the third slider is arranged on the fifth connecting rod, and the fifth connecting rod drives the third slider to move along the slide rail so that the third electrode approaches or moves away from the workpiece to be processed.

[0018] Furthermore, the fourth connecting rod and the fifth connecting rod are equal in length.

[0019] Furthermore, the first connecting rod and the third connecting rod are equal in length, and the length of the second connecting rod is half of the length of the first connecting rod.

[0020] Furthermore, the second connecting rod is hinged to the first connecting rod at half of its length.

[0021] Further, when the driving shaft moves in a preset direction, the first slider and the second slider move in the preset direction, the first electrode and the second electrode are close to the workpiece to be processed, and the third electrode is away from the workpiece to be processed; or

[0022] When the driving shaft moves in the opposite direction to the preset direction, the first slider and the second slider move in the opposite direction to the preset direction, the first electrode and the second electrode are away from the workpiece to be processed, and the third electrode is close to the workpiece to be processed.

[0023] Furthermore, the guide portion includes a first slide bar and a second slide bar, the first slide bar is arranged in parallel with the second slide bar, the first slider is sleeved on the first slide bar and the second slide bar, and the second slider is sleeved on the first slide bar and the second slide bar.

[0024] The present application also provides an electric spark machine tool, comprising a drive shaft, a workbench and the multi-electrode electrical discharge machining auxiliary device described in any of the above embodiments, wherein the drive shaft is connected to the first slider of the multi-electrode electrical discharge machining auxiliary device, and the base of the multi-electrode electrical discharge machining auxiliary device is arranged on the workbench.

[0025] The beneficial effect of the multi-electrode electrical discharge machining auxiliary device provided by the present application is that compared with the prior art, the multi-electrode electrical discharge machining auxiliary device of the present application, by arranging a first electrode on the first slider, arranging a second electrode on the base, arranging the workpiece to be machined on the second slider, the first slider is connected to the driving shaft of the electric spark machine tool, the driving shaft drives the first slider to move along the guide part, and at the same time, the first slider drives the transmission mechanism to move, and then the transmission mechanism drives the second slider to move along the guide part, so that the first electrode and the second electrode are close to the workpiece to be machined on the second slider, thereby performing synchronous electrical discharge machining on different surfaces of the workpiece to be machined, thereby improving the machining efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0027] Figure 1 is a schematic diagram of the three-dimensional structure of a multi-electrode electrical discharge machining auxiliary device provided by an embodiment of the present application;

[0028] Figure 2 It is a schematic structural diagram of a multi-electrode electrical discharge machining auxiliary device provided by an embodiment of the present application from one perspective;

[0029] Figure 3 is a schematic diagram of a multi-electrode electrical discharge machining auxiliary device provided by an embodiment of the present application;

[0030] Figure 4 is a structural schematic diagram of a multi-electrode electrical discharge machining auxiliary device provided by another embodiment of the present application;

[0031] Figure 5 is a structural schematic diagram of a multi-electrode electrical discharge machining auxiliary device provided by another embodiment of the present application;

[0032] Figure 6 It is a schematic diagram of the structure of three cavities of a workpiece to be processed provided by an embodiment of the present application.

[0033] The reference numerals in the above drawings are as follows:

[0034] 100-Multi-electrode EDM auxiliary device;

[0035] 1-first slider; 2-second slider; 3-transmission mechanism; 4-base; 5-first electrode; 6-second electrode; 7-third electrode; 8-third slider;

[0036] 31-first connecting rod; 32-second connecting rod; 33-third connecting rod; 34-slide rail; 35-fourth connecting rod; 36-fifth connecting rod;

[0037] 41- guide part;

[0038] 411-first sliding bar; 412-second sliding bar;

[0039] 200-workpiece to be processed;

[0040] 300-Drive shaft. DETAILED DESCRIPTION

[0041] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present application more clearly understood, the present application is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0042] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it can be directly on the other element or indirectly on the other element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or indirectly connected to the other element.

[0043] It should be understood that the terms "length", "width", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0044] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of this application, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0045] In order to illustrate the technical solution described in this application, a detailed description is given below in conjunction with specific drawings and embodiments.

[0046] The principle of EDM machining is:

[0047] EDM is to apply a certain pulse voltage between the electrode and the workpiece. When the distance between the workpiece and the electrode is gradually shortened to a certain range, there will be a very strong electric field in the gap between the two, and discharge will occur between the workpiece and the electrode. During the discharge, extremely high temperature is generated instantly, which can gasify the workpiece material. Then, under the flushing effect of the working fluid, the removed workpiece material is discharged, thereby achieving the purpose of removing the workpiece material. However, since each discharge can only remove a small part of the workpiece material, a complete EDM process includes many discharges.

[0048] During the EDM process, there are three states:

[0049] 1) When the distance between the workpiece and the electrode is large, the electric field in the gap between the two is very weak and cannot form a discharge. At this time, it is an open circuit state;

[0050] 2) When the distance between the workpiece and the electrode is just within the discharge gap, the electric field in the gap between the two is very strong, forming a discharge, which is the normal discharge machining state;

[0051] 3) When the workpiece and the electrode are in contact, a circuit is directly formed between the two, and no discharge occurs. This is a short-circuit state.

[0052] The machining process of ordinary EDM machine tools is as follows: the workpiece to be machined and the electrode gradually approach each other, and when the gap is reduced to the discharge gap, discharge occurs. At this time, the servo system judges the current state of the discharge gap and the discharge state based on the feedback in the discharge circuit, and then controls the feed amount of the electrode to keep the gap between the workpiece to be machined and the electrode within the discharge gap. When a short circuit is detected, the feed axis quickly retracts, causing the gap between the two to expand. Therefore, in the ordinary EDM process, the feed axis controls the electrode to move forward and backward from time to time, which is a reciprocating feed process, and in the middle, the electrode is completely retracted to the origin to facilitate chip discharge.

[0053] like Figures 1 to 5As shown, one embodiment of the present application provides a multi-electrode electrical discharge machining auxiliary device 100, which is used on an electrical discharge machine tool, and includes a first slider 1, a second slider 2, a transmission mechanism 3 and a base 4. The first slider 1 is provided with a first electrode 5, and the first slider 1 can be connected to the driving shaft 300 of the electrical discharge machine tool; the workpiece 200 to be machined can be arranged on the second slider 2; the base 4 is provided with a second electrode 6 and a guide portion 41, the first slider 1 and the second slider 2 are arranged on the guide portion 41, the transmission mechanism 3 is transmission-connected with the first slider 1, the second slider 2 and the base 4, the driving shaft 300 drives the first slider 1 to move along the guide portion 41, the first slider 1 drives the transmission mechanism 3 to move, and the transmission mechanism 3 drives the second slider 2 to move along the guide portion 41, so that the first electrode 5 and the second electrode 6 can perform electrical discharge machining on the workpiece 200 to be machined.

[0054] The multi-electrode electrical discharge machining auxiliary device 100 provided in this embodiment is configured by arranging a first electrode 5 on the first slider 1, arranging a second electrode 6 on the base 4, arranging a workpiece 200 to be machined on the second slider 2, and connecting the first slider 1 to a driving shaft 300 of the electrical discharge machine. The driving shaft 300 drives the first slider 1 to move along the guide portion 41. At the same time, the first slider 1 drives the transmission mechanism 3 to move, and then the transmission mechanism 3 drives the second slider 2 to move along the guide portion 41, so that the first electrode 5 and the second electrode 6 are close to the workpiece 200 to be machined on the second slider 2, thereby performing synchronous electrical discharge machining on different surfaces of the workpiece 200 to be machined, thereby improving the machining efficiency.

[0055] Specifically, the multi-electrode discharge machining auxiliary device 100 of the present application can be directly used on an existing electric discharge machine. The base 4 is set on the workbench of the electric discharge machine, and the first slider 1 is connected to the drive shaft 300 of the electric discharge machine, that is, the feed shaft of the electric discharge machine. The first electrode 5 and the second electrode 6 are electrically connected to the discharge circuit of the electric discharge machine. When processing the workpiece 200 to be processed, the first slider 1 is driven by the drive shaft 300 to move along the guide portion 41, that is, it moves downward in the figure. At the same time, the transmission mechanism 3 is further transmitted under the action of the first slider 1, thereby driving the second slider 2 to move downward, thereby moving the workpiece 200 to be processed downward, so that the first electrode 5 is close to the workpiece 200 to be processed for discharge machining. At the same time, the workpiece 200 to be processed is also close to the second electrode 6, so that the second electrode 6 also performs discharge machining on the workpiece 200 to be processed, thereby realizing synchronous discharge machining of different surfaces of the workpiece 200 to be processed, such as the cavity of the workpiece 200 to be processed.

[0056] In some embodiments of the present application, optionally, Figures 1 to 5As shown, the transmission mechanism 3 includes a first connecting rod 31, a second connecting rod 32 and a third connecting rod 33. The first connecting rod 31 is hinged to the first slider 1; the second connecting rod 32 is hinged to the first connecting rod 31 and the second slider 2 respectively; the third connecting rod 33 is hinged to the base 4 and the first connecting rod 31 respectively.

[0057] In this embodiment, the transmission mechanism 3 is transmitted through a hinged kinematic pair composed of a first connecting rod 31, a second connecting rod 32 and a third connecting rod 33, wherein the first connecting rod 31 is hinged to the first slider 1, the second connecting rod 32 is hinged to the first connecting rod 31 and the second slider 2 respectively, and the third connecting rod 33 is hinged to the base 4 and the first connecting rod 31. In this way, when the first slider 1 moves downward or upward, the first connecting rod 31 drives the second connecting rod 32 and the third connecting rod 33 to move, so that the second connecting rod 32 drives the second slider 2 to move downward. The structure is simple and easy to manufacture, which reduces the production cost of the product and improves the market competitiveness of the product.

[0058] In the above embodiments of the present application, optionally, Figure 1 , Figure 3 and Figure 4 As shown, the lengths of the first connecting rod 31 and the third connecting rod 33 are equal, and the length of the second connecting rod 32 is half of the length of the first connecting rod 31. Optionally, the second connecting rod 32 is hinged to the first connecting rod 31 at half the length.

[0059] In this embodiment, by making the lengths of the first connecting rod 31 and the third connecting rod 33 equal, and the length of the second connecting rod 32 being half the length of the first connecting rod 31, the speed at which the transmission mechanism 3 drives the second slider 2 is half the speed of the first slider 1, and at the same time, it is convenient to control the motion trajectories of the two sliders.

[0060] In some embodiments of the present application, optionally, Figure 1 and Figure 2 , Figures 4 to 6 As shown, the multi-electrode discharge machining auxiliary device 100 also includes a third slider 8 and a third electrode 7. The third slider 8 is arranged on the third connecting rod 33. Specifically, the third slider 8 is hinged at the hinge of the first connecting rod 31 and the third connecting rod 33, and the third electrode 7 is arranged on the third slider 8. The slide rail 34 is connected to the second slider 2, and the third slider 8 is sleeved on the slide rail 34. The third connecting rod 33 drives the third slider 8 to move along the slide rail 34, so that the third electrode 7 is close to or away from the workpiece 200 to be processed.

[0061] In this embodiment, the multi-electrode discharge machining auxiliary device 100 can also be provided with more electrodes, such as a third slider 8 and a third electrode 7. The third slider 8 is arranged on the third connecting rod 33, and the slide rail 34 is fixedly connected to the second slider 2. A through hole is arranged at one end of the third slider 8, and the other end of the third slider 8 is fixedly connected to the third connecting rod 33. At the same time, the third electrode 7 is installed on the third slider 8, and the through hole is sleeved on the slide rail 34, so that the third slider 8 can move along the axial direction of the slide rail 34, that is, the length direction of the slide rail 34. In this way, when the first slider 1 moves downward, the first electrode 5 and the second electrode 6 perform discharge machining on the workpiece 200 to be machined. When the first slider 1 moves upward, the first electrode 5 and the second electrode 6 are away from the workpiece 200 to be machined. At this time, the third electrode 7 is close to the workpiece 200 to be machined, and then discharge machining is performed on the workpiece 200 to be machined. The setting of the slide rail 34 increases the stability of the third slider 8 during movement, thereby increasing the accuracy of the third electrode 7 during reciprocating movement, making it less likely to deflect, thereby improving the machining accuracy.

[0062] In the above embodiments of the present application, optionally, Figure 1 and Figure 5 As shown, the number of the third slider 8 and the third electrode 7 is multiple, and the transmission mechanism 3 also includes: a fourth connecting rod 35 and a fifth connecting rod 36. Optionally, the fourth connecting rod 35 and the fifth connecting rod 36 are equal in length, and the fourth connecting rod 35 is hinged to the first slider 1; the fifth connecting rod 36 is hinged to the base 4 and the fourth connecting rod 35, and the third slider 8 is arranged on the fifth connecting rod 36. The fifth connecting rod 36 drives the third slider 8 to move along the slide rail 34, so that the third electrode 7 is close to or away from the workpiece 200 to be processed. It should be noted that the fourth connecting rod 35 and the first connecting rod 31 have the same function, the fifth connecting rod 36 and the third connecting rod 33 have the same function, and the third electrode 7 is also provided on the third slider 8 connected to the hinge of the fifth connecting rod 36 and the fourth connecting rod 35. That is to say, in addition to the third slider 8 connected to the hinge of the first connecting rod 31 and the third connecting rod 33, a plurality of third sliders 8 and third electrodes 7 other than the third slider 8 can also be provided, and then the slide rail 34, the fourth connecting rod 35 and the fifth connecting rod 36 can be cooperated to perform multi-faceted discharge machining on the horizontal direction of the workpiece 200 to be machined, so that the four faces of the workpiece 200 to be machined can be assembled once for discharge machining, such as Figure 5 As shown, the workpiece to be processed has cavity a, cavity b, cavity c and cavity d, etc.

[0063] In some embodiments of the present application, optionally, when the driving shaft 300 of the EDM machine tool drives the first slider 1 and the first electrode 5 to move downward at a speed v1, the second slider 2 will drive the workpiece 200 to be processed to move downward at a speed of v2=v1 / 2 under the drive of the transmission mechanism 3. At the same time, the third slider 8 will drive the third electrode 7 to move left relative to the second slider 2 at a speed v3. At this time, with the workpiece 200 to be processed as a reference, the first electrode 5 moves downward at a speed v1 / 2, the second electrode 6 moves upward at a speed v1 / 2, and the third moves left at a speed v3. Conversely, when the driving shaft 300 of the EDM machine tool When 00 drives the first slider 1 and the first electrode 5 to move upward at a speed of v1, taking the workpiece 200 to be processed as a reference, the first electrode 5 moves upward at a speed of v1 / 2, the second electrode 6 moves downward at a speed of v1 / 2, and the third electrode 7 moves rightward at a speed of v3, so that the first electrode 5 and the second electrode 6 synchronously perform discharge processing on the workpiece 200 to be processed, and the third electrode 7 synchronously processes the workpiece 200 to be processed alone, and different surfaces of the workpiece 200 to be processed can be assembled and processed at the same time, thereby improving the processing accuracy and processing efficiency. It should be noted that v2=v1 / 2, and v2 is half of v1.

[0064] In some embodiments of the present application, optionally, when the driving shaft 300 moves in a preset direction, the first slider 1 and the second slider 2 move in the preset direction, the first electrode 5 and the second electrode 6 are close to the workpiece 200 to be processed, and the third electrode 7 is away from the workpiece 200 to be processed. The preset direction is the feed direction of the driving shaft 300. Figure 3 and Figure 4As shown, the EDM machine controls the driving shaft 300 to feed, that is, the driving shaft 300 drives the output downward, thereby causing the first slider 1 to move downward, and at the same time, the transmission mechanism 3 drives the second slider 2 to move downward, thereby causing the first electrode 5 and the second electrode 6 to approach the workpiece 200 to be processed. At this time, the third electrode 7, under the action of the third connecting rod 33, causes the third electrode 7 to move in a direction away from the workpiece 200 to be processed, thereby performing discharge processing on the workpiece 200 to process cavities a and b; conversely, when the driving shaft 300 moves in the opposite direction of the preset direction, the first slider 1 and the second slider 2 move in the opposite direction of the preset direction, and the first electrode 5 and The second electrode 6 is away from the workpiece 200 to be machined, and the third electrode 7 is close to the workpiece 200 to be machined. The EDM machine controls the drive shaft 300 to retract, that is, the drive shaft 300 is driven upward, thereby causing the first slider 1 to move upward. At the same time, the transmission mechanism 3 drives the second slider 2 to move upward, thereby causing the first electrode 5 and the second electrode 6 to be away from the workpiece 200 to be machined. At this time, the third electrode 7, under the action of the third connecting rod 33, moves the third electrode 7 toward the workpiece 200 to be machined, thereby performing discharge machining on the workpiece 200 to machine a cavity c. This machining method does not require changes to the feed control system of the existing EDM machine.

[0065] In some embodiments of the present application, optionally, Figure 2 As shown, the guide portion 41 includes a first slide bar 411 and a second slide bar 412, the first slide bar 411 is arranged in parallel with the second slide bar 412, the first slide bar 1 is sleeved on the first slide bar 411 and the second slide bar 412, and the second slide bar 2 is also sleeved on the first slide bar 411 and the second slide bar 412.

[0066] In this embodiment, the guide portion 41 may be composed of a first slide bar 411 and a second slide bar 412. The first slide bar 1 and the second slide bar 2 are both provided with shaft holes, and the first slide bar 1 and the second slide bar 2 are sleeved on the first slide bar 411 and the second slide bar 412 through the shaft holes, that is, the first slide bar 1 is sleeved on the first slide bar 411 and the second slide bar 412, respectively, and the second slide bar 2 is sleeved on the first slide bar 411 and the second slide bar 412, respectively, so that the first slide bar 1 and the second slide bar 2 are more stable when moving and are not prone to offset, thereby ensuring the accuracy of the first electrode 5 on the workpiece 200 to be processed. Of course, the guide portion 4 may also be a slide rail, and the first slide bar 1 and the second slide bar 2 are both arranged on the slide rail, and the specific structure will not be repeated one by one.

[0067] The present application also provides an electric spark machine tool, comprising a drive shaft 300, a workbench and the multi-electrode electrical discharge machining auxiliary device 100 described in any of the above embodiments, wherein the drive shaft 300 is connected to the first slider 1 of the multi-electrode electrical discharge machining auxiliary device 100, and the base 4 of the multi-electrode electrical discharge machining auxiliary device 100 is arranged on the workbench.

[0068] Specifically, if Figures 1 to 6 As shown, the multi-electrode electrical discharge machining auxiliary device 100 provided in this embodiment is applied to an electrical discharge machine tool and works as follows:

[0069] For some complex structures, the ordinary one-way feed EDM method cannot produce such Figure 6 The cavities of the workpiece 200 to be processed shown in the figure, in order to process cavities a, b and c on the workpiece 200, the three cavities are interconnected and have a tapered hole structure, which is small inside and large outside. The existing EDM machine tool cannot process the three cavities through one discharge machining. If the existing EDM machine tool is used for machining, the three cavities need to be machined separately three times, which will cause positioning errors caused by repeated clamping and reduce the machining efficiency. However, by using the multi-electrode EDM auxiliary device 100 of the present application, only one clamping is required, and the three electrodes can be fed synchronously to machine the three cavities at the same time. Specifically, the EDM machine tool controls the drive shaft 300 to feed, that is, the drive shaft 300 drives the output downward, thereby causing the first slider 1 to move downward. At the same time, the transmission mechanism 3 drives the second slider 2 to move downward, thereby causing the first electrode 5 and the second electrode 6 to move downward. The third electrode 6 is close to the workpiece 200 to be processed, and at this time, the third electrode 7 is moved away from the workpiece 200 to be processed under the action of the third connecting rod 33, so that the workpiece 200 to be processed is subjected to discharge machining to form cavities a and b. The EDM machine tool controls the drive shaft 300 to retract, that is, the drive shaft 300 is driven upward, thereby causing the first slider 1 to move upward. At the same time, the transmission mechanism 3 drives the second slider 2 to move upward as well, thereby causing the first electrode 5 and the second electrode 6 to be away from the workpiece 200 to be processed. At this time, the third electrode 7 is moved towards the workpiece 200 to be processed under the action of the third connecting rod 33, thereby causing the workpiece 200 to be subjected to discharge machining to form cavities c, thereby improving the machining efficiency and avoiding the positioning error problem caused by repeated clamping, thereby improving the machining accuracy.

[0070] The above description is only an optional embodiment of the present application and is not intended to limit the present application. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present application should be included in the protection scope of the present application.

Claims

1. A multi-electrode electrical discharge machining auxiliary device, used on an electrical discharge machine tool, characterized in that: The multi-electrode electrical discharge machining auxiliary device comprises: A first slider, on which a first electrode is disposed, and the first slider can be connected to a driving shaft of the electric spark machine tool; a second slide block, on which the workpiece to be processed can be arranged; A base, wherein the base is provided with a second electrode and a guide portion, and the first slider and the second slider are provided on the guide portion; a transmission mechanism, wherein the transmission mechanism is transmission-connected with the first slider, the second slider and the base, the driving shaft drives the first slider to move along the guide portion, the first slider drives the transmission mechanism to move, and the transmission mechanism drives the second slider to move along the guide portion, so that the first electrode and the second electrode can perform electrical discharge machining on the workpiece to be machined; The transmission mechanism comprises: a first connecting rod, the first connecting rod being hinged to the first sliding block; a second connecting rod, the second connecting rod being hinged to the first connecting rod and the second sliding block respectively; a third connecting rod, the third connecting rod being hinged to the base and the first connecting rod respectively; The guide portion includes a first slide bar and a second slide bar, the first slide bar is arranged in parallel with the second slide bar, the first slider is sleeved on the first slide bar and the second slide bar, and the second slider is sleeved on the first slide bar and the second slide bar.

2. The multi-electrode electrical discharge machining assisting device according to claim 1, characterized in that: The multi-electrode discharge machining auxiliary device also includes a slide rail, a third slider and a third electrode. The third slider is arranged on the third connecting rod, and the third electrode is arranged on the third slider. The slide rail is connected to the second slider, and the third slider is sleeved on the slide rail. The third connecting rod drives the third slider to move along the slide rail so that the third electrode is close to or away from the workpiece to be processed.

3. The multi-electrode electrical discharge machining assisting device according to claim 2, characterized in that: There are multiple third sliders and multiple third electrodes, and the transmission mechanism further includes: a fourth connecting rod, the fourth connecting rod being hinged to the first sliding block; A fifth connecting rod is hinged to the base and the fourth connecting rod, the third slider is arranged on the fifth connecting rod, and the fifth connecting rod drives the third slider to move along the slide rail so that the third electrode approaches or moves away from the workpiece to be processed.

4. The multi-electrode electrical discharge machining assisting device according to claim 3, characterized in that: The fourth connecting rod and the fifth connecting rod have the same length.

5. The multi-electrode electrical discharge machining assisting device according to claim 1, characterized in that: The first connecting rod and the third connecting rod have the same length, and the second connecting rod has a length that is half of the length of the first connecting rod.

6. The multi-electrode electrical discharge machining assisting device according to claim 5, characterized in that: The second link is hinged to the first link at a position half the length of the first link.

7. The multi-electrode electrical discharge machining assisting device according to claim 3, characterized in that: When the driving shaft moves in a preset direction, the first slider and the second slider move in the preset direction, the first electrode and the second electrode approach the workpiece to be processed, and the third electrode moves away from the workpiece to be processed; or When the driving shaft moves in the opposite direction to the preset direction, the first slider and the second slider move in the opposite direction to the preset direction, the first electrode and the second electrode are away from the workpiece to be processed, and the third electrode is close to the workpiece to be processed.

8. An electric spark machine tool, characterized in that: It comprises a driving shaft, a workbench and the multi-electrode electrical discharge machining auxiliary device as claimed in claim 1, wherein the driving shaft is connected to the first slider of the multi-electrode electrical discharge machining auxiliary device, and the base of the multi-electrode electrical discharge machining auxiliary device is arranged on the workbench.

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