Method for machining high-carbon high-chromium molybdenum alloy steel chute through electric spark

Abstract

The invention discloses a method for electric spark machining of a high-carbon high-chromium molybdenum alloy steel chute, a first group of electrodes is adopted to machine the chute to be machined, the first group of electrodes comprises a first electrode, a second electrode and a third electrode, when the first group of electrodes is adopted to machine each chute, the first electrode is firstly used for rough machining, and then the second electrode is used for machining; carrying out semi-finish machining by using a second electrode, and finally carrying out finish machining by using a third electrode; after a plurality of skewed slots are machined, after a first electrode in a first group of electrodes is abraded, a second group of electrodes is adopted to machine the skewed slots to be machined, the second group of electrodes comprises a second electrode, a third electrode and a fourth electrode, when the second group of electrodes is adopted to machine each skewed slot, the second electrode is firstly used for rough machining, and then the third electrode is used for semi-finish machining; and finally, finish machining is conducted through a fourth electrode. And in this way, after the (n-3) th electrode in the (n-3) th group of electrodes is abraded, the (n-2) th group of electrodes is adopted to machine the chute to be machined, the (n-2) th group of electrodes comprises the (n-2) th electrode, the (n-1) th electrode and the nth electrode, when the (n-2) th group of electrodes is adopted to machine each chute, the (n-2) th electrode is firstly used for rough machining, and then the (n-1) th electrode is used for semi-finish machining, and finally, finish machining is conducted through the nth electrode. The invention aims to improve the processing efficiency and reduce the production cost while ensuring the processing quality.

Description

Technical Field

[0001] The invention belongs to the technical field of high-carbon high-chromium-molybdenum alloy steel processing, and particularly relates to a method for electrospark processing a high-carbon high-chromium-molybdenum alloy steel inclined groove. Background Art

[0002] As a high-performance material, high-carbon high-chromium-molybdenum alloy steel (Cr18Mo16V) has extremely high hardness, wear resistance and thermal hardness in industrial production due to its hardness HRC ≥ 58. It is widely used in situations that need to withstand high loads and extreme temperatures. However, the internal structure of this material is uneven, resulting in poor overall processing performance. In the traditional processing process, such as using a machining center to mill Cr18Mo16V alloy steel parts, especially in the processing of Figure 1 When the three inclined grooves are shown, due to the high hardness and unevenness of the material, the intersection of the inclined groove and the outer circle and the end face is very likely to fall off, which seriously affects the processing accuracy and final quality of the product. This problem not only increases the scrap rate, but also reduces production efficiency and increases production costs.

[0003] In order to overcome the limitations of traditional processing methods, the industry began to explore the use of EDM technology to process such hard materials that are difficult to process. EDM technology, with its high energy density during pulse discharge, can realize the processing of special materials and complex-shaped parts that are difficult or impossible to process by ordinary mechanical methods, and is not affected by the hardness of the parts. Therefore, changing the bevel originally processed by milling to EDM grooving has become a feasible solution. In the process of EDM processing bevel grooves, it is usually necessary to clamp the parts on the fixture to ensure the stability of the processing. For example, a common processing method is to install the parts in a square with a triangular shape, combine a fixture with a 7° angle, and then fix the three squares containing the parts on the fixture, and use a single electrode to process the bevel grooves one by one. After completing the processing of one bevel groove, it is necessary to remove the three squares from the fixture, readjust the clamping position, and then process the other two bevel grooves in turn. Although this processing method can avoid the block drop phenomenon in traditional milling, the electrode wears very quickly due to the single-electrode processing method. One electrode can only process 1 to 3 parts before it needs to be replaced. This not only reduces processing efficiency, but also increases production costs, limiting the widespread application of this technology in industrial production. Summary of the invention

[0004] In view of the problems existing in the prior art, the present invention provides a method for electrospark machining a high-carbon and high-chromium-molybdenum alloy steel inclined groove, which aims to improve the machining efficiency and reduce the production cost while ensuring the machining quality.

[0005] In order to solve the above technical problems, the present invention is implemented by the following technical solutions: A method for electrospark machining a high-carbon, high-chromium, molybdenum alloy steel bevel groove, wherein a multi-head electrode is used to electrospark machine a part to be machined, wherein the multi-head electrode comprises n electrodes, and the end face slope of each electrode is the same as the slope of the bevel groove to be machined of the part to be machined, and n is greater than 3. The machining method comprises: The first group of electrodes is used to process the bevel groove to be processed. The first group of electrodes includes a first electrode, a second electrode and a third electrode. When each bevel groove is processed by the first group of electrodes, the first electrode is used for rough processing first, the second electrode is used for semi-finishing processing, and the third electrode is used for finishing processing finally; After processing a number of inclined grooves, when the first electrode in the first group of electrodes is worn, the second group of electrodes is used to process the inclined groove to be processed. The second group of electrodes includes the second electrode, the third electrode and the fourth electrode. When the second group of electrodes is used to process each inclined groove, the second electrode is used to perform rough processing first, the third electrode is used to perform semi-finishing processing, and finally the fourth electrode is used to perform finishing processing; By analogy, when the n-3th electrode in the n-3th group of electrodes is worn, the n-2th group of electrodes is used to process the bevel groove to be processed. The n-2th group of electrodes includes the n-2th electrode, the n-1th electrode and the nth electrode. When each bevel groove is processed by the n-2th group of electrodes, the n-2th electrode is first used for rough processing, then the n-1th electrode is used for semi-finishing processing, and finally the nth electrode is used for finishing processing.

[0006] Furthermore, before processing, the multi-head electrode is clamped on a workbench, and the part to be processed is clamped on a spindle; For the same part to be processed, after processing one bevel groove, the spindle is controlled to rotate to a set angle before processing the next bevel groove.

[0007] Furthermore, the step of clamping the part to be processed on the spindle is specifically as follows: The parts to be processed are clamped on the spindle by using a bushing and a tightening screw.

[0008] Furthermore, after the part to be processed is clamped on the spindle, the process also includes: The tool alignment between the multi-head electrode and the workpiece to be processed is carried out by edge contact method.

[0009] Furthermore, the length of each electrode is the same as the designed length of the inclined groove to be processed.

[0010] Furthermore, the width of each electrode is 0.06 mm to 0.08 mm smaller than the designed width of the inclined groove to be processed.

[0011] Furthermore, the multi-head electrode includes 10 electrodes.

[0012] Furthermore, the multi-head electrode is manufactured by using copper-tungsten alloy steel plate.

[0013] Furthermore, the multi-head electrode includes a clamping portion and n electrodes arranged at the end of the clamping portion.

[0014] Furthermore, the clamping portion and the n electrodes arranged at the end of the clamping portion are of integrated design.

[0015] Compared with the prior art, the present invention has at least the following beneficial effects: The present invention provides a method for electrospark machining a high-carbon high-chromium-molybdenum alloy steel inclined groove. Compared with the single-electrode electrospark machining technology, by using a multi-head electrode, the electrodes are used in groups, each group of electrodes contains three electrodes, each electrode performs rough machining, semi-finishing and finishing respectively, when the electrode used for rough machining in each group of electrodes is worn, the next group of electrodes is used to perform machining again in the manner of rough machining, semi-finishing and finishing, the electrode used for rough machining in the next group of electrodes adopts the electrode used for semi-finishing in the previous group of electrodes, the electrode used for semi-finishing in the next group of electrodes adopts the electrode used for finishing in the previous group of electrodes, and the electrode used for finishing in the next group of electrodes adopts the unused electrode, this staggered machining method not only optimizes the use of electrodes, but also avoids the problem of reduced machining accuracy caused by excessive wear of electrodes, thereby improving the machining accuracy and final quality of the product. At the same time, since the continuous machining method of the multi-head electrode reduces the replacement frequency of the electrode, the utilization rate of the electrode is maximized, the number of uses is significantly increased, and the consumption and replacement cost of the electrode are directly reduced, thereby reducing the overall production cost. In summary, the method for electrospark machining a high-carbon and high-chromium-molybdenum alloy steel bevel groove proposed in the present invention has obvious advantages in improving machining efficiency, reducing production costs, improving machining accuracy and product quality, enhancing machining stability, and broadening the scope of application.

[0016] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, preferred embodiments are given below and described in detail with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solutions in the specific implementation modes of the present invention, the drawings required for use in the description of the specific implementation modes will be briefly introduced below. Obviously, the drawings described below are some implementation modes of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0018] Figure 1 This is a flow chart of a method for electrospark machining a high-carbon, high-chromium, molybdenum alloy steel inclined groove according to an embodiment of the present invention; Figure 2It is an axonometric view of a multi-head electrode in a method for electrospark machining a high-carbon, high-chromium, molybdenum alloy steel inclined groove according to an embodiment of the present invention; Figure 3 This is an axonometric view of a part to be machined in a method for electrospark machining a high-carbon, high-chromium, molybdenum alloy steel inclined groove according to an embodiment of the present invention; Figure 4 A cross-sectional view of a part to be machined in a method for electrospark machining a high-carbon, high-chromium, molybdenum alloy steel inclined groove according to an embodiment of the present invention; Figure 5 A schematic diagram of tool length alignment in a method for electrospark machining a high-carbon, high-chromium, molybdenum alloy steel inclined groove according to an embodiment of the present invention; Figure 6 A schematic diagram of tool diameter setting in a method for electrospark machining a high-carbon, high-chromium, molybdenum alloy steel inclined groove according to an embodiment of the present invention; Figure 7 This is a schematic diagram of clamping a part to be machined in a method for electrospark machining a high-carbon, high-chromium, molybdenum alloy steel inclined groove according to an embodiment of the present invention; Figure 8 This is a schematic diagram of the dimensions of multiple electrodes in a method for electrospark machining a high-carbon, high-chromium, molybdenum alloy steel inclined groove according to an embodiment of the present invention.

[0019] In the figure, 1-multi-head electrode; 10-clamping part; 11-electrode; 2-parts to be processed; 3-bushing; 4-tightening screw. DETAILED DESCRIPTION

[0020] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution of the present invention will be clearly and completely described below in conjunction with the accompanying drawings. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0021] Combination Figure 1 As shown, an embodiment of the present invention provides a method for electrospark machining a high-carbon high-chromium-molybdenum alloy steel bevel groove, wherein a multi-head electrode 1 is used to electrospark machine a part 2 to be machined, wherein the multi-head electrode 1 comprises n electrodes 11, and the end face slope of each electrode 11 is the same as the slope of the bevel groove to be machined of the part 2 to be machined, and n is greater than 3. By using the multi-head electrode 1, the method improves machining efficiency and reduces production costs while ensuring machining quality.

[0022] The method for electrospark machining a high-carbon, high-chromium, molybdenum alloy steel bevel groove is specifically as follows: a first group of electrodes is used to machine the bevel groove to be machined, the first group of electrodes includes a first electrode, a second electrode and a third electrode, when the first group of electrodes is used to machine each bevel groove, the first electrode is used for rough machining, the second electrode is used for semi-finishing machining, and the third electrode is used for finishing machining; after machining a number of bevel grooves, when the first electrode in the first group of electrodes is worn, a second group of electrodes is used to machine the bevel groove to be machined, the second group of electrodes includes a second electrode, a third electrode and a fourth electrode, and the third electrode is used for finishing machining. When two groups of electrodes are used to process each bevel groove, the second electrode is first used for rough machining, then the third electrode is used for semi-finishing, and finally the fourth electrode is used for finishing; and so on, when the n-3th electrode in the n-3th group of electrodes is worn, the n-2th group of electrodes is used to process the bevel groove to be machined, and the n-2th group of electrodes includes the n-2th electrode, the n-1th electrode and the nth electrode. When the n-2th group of electrodes is used to process each bevel groove, the n-2th electrode is first used for rough machining, then the n-1th electrode is used for semi-finishing, and finally the nth electrode is used for finishing.

[0023] Specifically, according to the specific size and slope requirements of the chute to be processed, a multi-head electrode is designed and manufactured. The end face slope of each electrode needs to match the slope of the chute to be processed to ensure the processing accuracy. The multi-head electrode contains n electrodes (n>3). Considering the high hardness and wear resistance of high-carbon high-chromium-molybdenum alloy steel, the electrode material should be selected from materials with high conductivity, high hardness and good heat resistance, such as copper-tungsten alloy or silver-tungsten alloy, to ensure the durability and processing efficiency of the electrode. First, the first group of electrodes (first electrode, second electrode and third electrode) are used for processing. First, the first electrode is used for rough processing to remove most of the material, and then the second electrode is used for semi-finishing to further trim the shape and size, and finally the third electrode is used for finishing to achieve the final size and surface quality requirements. When the first electrode in the first group of electrodes is worn to a certain extent and affects the processing accuracy, it is replaced with the second group of electrodes (second electrode, third electrode and fourth electrode), and the processing continues in the order of rough processing, semi-finishing and finishing. By analogy, when the n-3 electrode in the n-3 electrode group is worn out, it is replaced by the n-2 electrode group.

[0024] It should be understood that the parameters of EDM, such as pulse width, pulse interval, discharge current and discharge voltage, are adjusted according to the actual situation during the machining process to optimize machining efficiency and machining quality. During and after machining, the size, shape and surface quality of the chute are tested to ensure that they meet the design requirements. Based on the test results, the machining parameters and electrode wear are fed back and analyzed, and adjusted and optimized when necessary to improve machining efficiency and machining quality.

[0025] The present invention reduces the number of electrode replacements and downtime by using a multi-head electrode, thereby reducing production costs. The continuous processing method of the multi-head electrode improves processing efficiency and shortens the production cycle. The electrodes of the multi-head electrode are grouped to perform rough processing, semi-finishing processing and finishing processing on the chute. Such staggered processing can maximize the utilization rate of each electrode and significantly increase the number of uses.

[0026] In one possible implementation, combining Figure 3 , Figure 4 and Figure 7 As shown, before processing, the multi-head electrode 1 is clamped on the workbench, and the part to be processed is clamped on the spindle. For the same part to be processed, after processing one inclined groove, the spindle is controlled to rotate a set angle to process the next inclined groove.

[0027] Specifically, before the processing begins, the multi-head electrode needs to be clamped on the workbench. At the same time, the part to be processed is clamped on the spindle. It should be understood that when the multi-head electrode is clamped, the electrode needs to be positioned, clamped, and adjusted relative to the workbench.

[0028] For the same part to be processed, after one bevel is processed, the spindle needs to be controlled to rotate to the processing position of the next bevel. For example, when three evenly distributed bevels need to be processed on the part to be processed, the angle between each bevel should be 120°. Therefore, after the first bevel is processed, the spindle should be controlled to rotate 120°, and then the second bevel is processed; after the second bevel is completed, the spindle should be rotated 120° again to process the third bevel.

[0029] During the machining process, rough machining, semi-finishing and finishing should be performed using different groups of multi-head electrodes in the order described in the above embodiment. When one electrode in a group of electrodes is worn to a certain extent and affects the machining accuracy, it should be replaced with the next group of electrodes in time.

[0030] In one possible implementation, combining Figure 7 As shown, the part 2 to be processed is clamped on the main shaft, specifically: the part 2 to be processed is clamped on the main shaft by using the bushing 3 and the tightening screw 4 in cooperation.

[0031] That is to say, the part 2 to be processed is clamped on the main shaft by the cooperation of the bushing 3 and the clamping screw 4. This method combines the supporting function of the bushing and the clamping force of the clamping screw to realize the clamping method of the part on the main shaft. Exemplarily, the bushing is made of a wear-resistant, corrosion-resistant material with a certain elasticity, such as copper alloy or stainless steel. Its inner diameter should match the outer diameter of the part to be processed to ensure good contact and support. During installation, the bushing fixes the part with the clamping screw and then installs it on the main shaft. This clamping method facilitates the rapid installation and disassembly of the parts to be processed and improves the processing efficiency.

[0032] In one possible implementation, combining Figure 5 and Figure 6 As shown, after the workpiece to be processed is clamped on the spindle, the method further includes: using an edge-contacting method to align the multi-head electrode with the workpiece to be processed.

[0033] Before tool setting, make sure that the multi-head electrode is correctly installed on the workbench. Edge setting is a commonly used tool setting method. By controlling the edge of the part to slightly contact the electrode, the relative position relationship between the part and the electrode is determined. This method is simple, fast, and can intuitively reflect the actual distance between the part and the electrode.

[0034] Specifically, first, move the part to be processed to a position close to the multi-head electrode. During this process, ensure that the part to be processed moves slowly and steadily to avoid damage caused by collision. Then, control the edge of the part to gradually approach the electrode in small steps until the part and the electrode are slightly in contact. Once the part contacts the electrode, the movement of the part should be stopped immediately and the current position information should be recorded. By using the edge-to-edge method to align the part to be processed with the multi-head electrode, precise alignment between the electrode and the part is achieved, improving processing accuracy and reducing errors.

[0035] In one achievable embodiment, the length of each electrode is the same as the designed length of the bevel groove to be processed, ensuring that the electrode can completely cover the length of the bevel groove during processing, thereby avoiding the problem of incomplete processing or inconsistent bevel groove shape due to insufficient electrode length.

[0036] That is to say, the design of the electrode length is based on the specific size and requirements of the bevel to be processed, so as to ensure that the length of the electrode matches the design length of the bevel, which can ensure that the relative position relationship between the electrode and the bevel is stable during the processing, thereby improving the processing accuracy and reducing the error.

[0037] In one possible implementation, the existence of the discharge gap is taken into account, and the width of each electrode is 0.06 mm to 0.08 mm smaller than the designed width of the oblique groove to be processed, ensuring that the discharge gap between the electrode and the oblique groove is uniform and stable during the processing, thereby improving the processing accuracy and reducing the error. Exemplarily, the width of each electrode is 0.07 mm smaller than the designed width of the oblique groove to be processed.

[0038] It should be understood that the discharge gap is an inevitable phenomenon in the EDM process. When designing the electrode width, the size of the discharge gap must be fully considered to ensure that the width of the machined bevel groove meets the design requirements. The design of the electrode width is based on the specific size and requirements of the bevel groove to be machined.

[0039] In one possible implementation, combining Figure 2 As shown, the multi-head electrode includes 10 electrodes, and the number of 10 electrodes can ensure high processing efficiency without causing excessive burden on the equipment. In other words, this embodiment achieves comprehensive optimization of processing efficiency, processing quality and equipment utilization by adopting a multi-head electrode design including 10 electrodes.

[0040] It should be noted that in the design of multi-head electrodes, the layout of the 10 electrodes must ensure that each electrode can participate in the EDM process evenly and effectively.

[0041] In one achievable method, the multi-head electrode is manufactured using a copper-tungsten alloy steel plate. Copper-tungsten alloy is a high-performance composite material made of metal tungsten and copper powder through high-temperature infiltration. It has the characteristics of high melting point, high specific heat, and wear resistance, and has good thermal and electrical conductivity. As the material of the multi-head electrode, the copper-tungsten alloy steel plate has a high hardness, can effectively resist wear during the processing, and extend the service life of the electrode. At the same time, it has good electrical conductivity, can ensure the discharge efficiency during the electrospark machining process, and improve the machining speed. Copper-tungsten alloy can remain stable at high temperatures and is not easy to deform, thereby ensuring machining accuracy.

[0042] In one possible implementation, combining Figure 2 As shown, the multi-head electrode 1 includes a clamping portion 10 and n electrodes 11 arranged at the end of the clamping portion 10 .

[0043] Specifically, the clamping part 10 is an important part connecting the electrode and the workbench, which is responsible for fixing the electrode and transmitting the current and signal required for processing. The design of the clamping part 10 should take into account the fixing stability of the electrode, the convenience of replacement, and the compatibility with the workbench. The n electrodes 11 are evenly distributed at the ends of the clamping part 10 to form a processing surface of the multi-head electrode. In this embodiment, the electrode 11 and the clamping part 10 are designed as an integrated molding.

[0044] For example, a copper-tungsten alloy steel plate is selected as the electrode material. The upper and lower surfaces of the copper-tungsten alloy steel plate are first ground on a surface grinder to ensure its flatness. Finally, the two surfaces are clamped and ground using a vise, and the distance between each electrode, the length and diameter of each electrode, the center alignment zone, and the angle are processed on a machining center.

[0045] In a specific embodiment, the method of the present invention is used in Figure 3 and Figure 4 The shown example shows the machining of bevel grooves on high-carbon, high-chromium-molybdenum alloy steel. The polarity reversal function is selected in the programming (the spindle clamps the part, and the worktable clamps the multi-head electrode). The first three electrodes of the multi-head electrode (i.e., the first group of electrodes, serial numbers a, b, and c) are respectively rough-machined, semi-finished, and fine-machined. After the first bevel groove is machined, the spindle rotates 120°, and the second bevel groove is machined in the same way. After the second bevel groove is machined, the spindle rotates 120°, and the third bevel groove is machined in the same way. The first group of electrodes can machine 28 to 32 parts. After the serial number a electrode is worn, the second group of electrodes (serial numbers b, c, and d) are used for rough machining, semi-finishing, and fine machining, respectively. By analogy, a multi-head electrode can machine 224 to 256 parts. When all electrodes are worn, the worn electrodes can be cut off, and then 10 identical electrodes can be cut out on the electrode plate to machine parts. This method not only effectively ensures the quality of parts, improves processing efficiency, reduces production costs, but also provides a guarantee for the timely delivery of parts.

[0046] When processing such parts using a single electrode, the electrode wears out quickly and one electrode can only process 1 to 2 parts before it needs to be replaced with a new electrode. In addition, processing one inclined groove requires rotating the part once, resulting in low processing efficiency and high processing costs.

[0047] In this embodiment, combined Figure 8 As shown, the width B of the entire multi-head electrode is 50 mm, the width L of one electrode is 1.4 mm, and the distance L1 from one electrode to the center of the entire multi-head electrode is 24.3 mm.

[0048] The method of the present invention is used to verify the processing of various chute and groove parts of high-carbon high-chromium-molybdenum alloy steels and similar materials, which is convenient for processing multiple chute or groove parts that are difficult or impossible to process by ordinary processing methods. The method is simple to operate and has no implementation difficulties, and can effectively ensure the processing quality and processing efficiency of parts. At the same time, the method is easy to use at the production site and can be used as a reference for all chute and groove parts of high-carbon high-chromium-molybdenum alloy steels and similar materials to improve processing efficiency and the qualified rate of parts.

[0049] In the description of the present invention, it is necessary to understand that the terms "upper", "lower", "bottom", "inside", "outside", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0050] 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. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present invention, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0051] In the present invention, unless otherwise clearly specified and limited, the terms "connected", "connection" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection, an electrical connection, or communication with each other; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0052] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0053] In the present invention, the terms "one embodiment", "some embodiments", "examples", "specific examples", or "some examples" etc. mean that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the described specific features, structures, materials or characteristics may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0054] Finally, it should be noted that the above-described embodiments are only specific implementations of the present invention, which are used to illustrate the technical solutions of the present invention, rather than to limit them. The protection scope of the present invention is not limited thereto. Although the present invention is described in detail with reference to the above-described embodiments, ordinary technicians in the field should understand that any technician familiar with the technical field can still modify the technical solutions recorded in the above-described embodiments within the technical scope disclosed by the present invention, or can easily think of changes, or make equivalent replacements for some of the technical features therein; and these modifications, changes or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present invention, and should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention shall be based on the protection scope of the claims.

Claims

1. A method for electrospark machining a high-carbon high-chromium-molybdenum alloy steel chute, characterized in that: The multi-head electrode is used to perform electric spark machining on the part to be machined, wherein the multi-head electrode includes n electrodes, the end face slope of each electrode is the same as the slope of the machined groove of the part to be machined, and n is greater than 3. The machining method includes: The first group of electrodes is used to process the bevel groove to be processed. The first group of electrodes includes a first electrode, a second electrode and a third electrode. When each bevel groove is processed by the first group of electrodes, the first electrode is used for rough processing first, the second electrode is used for semi-finishing processing, and the third electrode is used for finishing processing finally; After processing a number of inclined grooves, when the first electrode in the first group of electrodes is worn, the second group of electrodes is used to process the inclined groove to be processed. The second group of electrodes includes the second electrode, the third electrode and the fourth electrode. When the second group of electrodes is used to process each inclined groove, the second electrode is used to perform rough processing first, the third electrode is used to perform semi-finishing processing, and finally the fourth electrode is used to perform finishing processing; By analogy, when the n-3th electrode in the n-3th group of electrodes is worn, the n-2th group of electrodes is used to process the bevel groove to be processed. The n-2th group of electrodes includes the n-2th electrode, the n-1th electrode and the nth electrode. When each bevel groove is processed by the n-2th group of electrodes, the n-2th electrode is first used for rough processing, then the n-1th electrode is used for semi-finishing processing, and finally the nth electrode is used for finishing processing.

2. The method for electrospark machining a high-carbon high-chromium-molybdenum alloy steel inclined groove according to claim 1, characterized in that: Before processing, the multi-head electrode is clamped on a workbench, and the part to be processed is clamped on a spindle; For the same part to be processed, after processing one bevel groove, the spindle is controlled to rotate to a set angle before processing the next bevel groove.

3. The method for electrospark machining a high-carbon high-chromium-molybdenum alloy steel inclined groove according to claim 2, characterized in that: The process of clamping the workpiece to be processed on the spindle is specifically as follows: The workpiece to be processed is clamped on the spindle by using a bushing and a clamping screw.

4. The method for electrospark machining a high-carbon high-chromium-molybdenum alloy steel inclined groove according to claim 2, characterized in that: After the parts to be processed are clamped on the spindle, it also includes: The tool alignment between the multi-head electrode and the workpiece to be processed is carried out by edge contact method.

5. The method for electrospark machining high carbon high chromium molybdenum alloy steel inclined groove according to claim 1, characterized in that: The length of each electrode is the same as the designed length of the inclined groove to be processed.

6. The method for electrospark machining high-carbon high-chromium-molybdenum alloy steel inclined groove according to claim 1, characterized in that: The width of each electrode is 0.06 mm to 0.08 mm smaller than the design width of the inclined groove to be processed.

7. The method for electrospark machining high-carbon high-chromium-molybdenum alloy steel inclined groove according to claim 1, characterized in that: The multi-head electrode includes 10 electrodes.

8. The method for electrospark machining high-carbon high-chromium-molybdenum alloy steel inclined groove according to claim 1, characterized in that: The multi-head electrode is made of copper-tungsten alloy steel plate.

9. The method for electrospark machining a high-carbon high-chromium-molybdenum alloy steel inclined groove according to claim 1, characterized in that: The multi-head electrode includes a clamping portion and n electrodes arranged at the end of the clamping portion.

10. The method for electrospark machining high carbon high chromium molybdenum alloy steel inclined groove according to claim 9, characterized in that: The clamping portion and the n electrodes arranged at the end of the clamping portion are designed as an integrated whole.

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