Method and apparatus for inspecting graphite electrodes machined from graphite

Abstract

The present application relates to a testing method and tool for graphite machining graphite electrode, and a machining method, the testing tool comprising continuous different circular arc switching machining testing area, small hole continuous machining testing area, slope thin wall testing area, straight body thin wall testing area, straight body circle testing area and slope circle testing area. The testing method comprises inputting the testing area and machining process of the testing tool into the graphite machine to be tested; starting machining through the graphite machine to be tested; judging whether the corresponding performance of the graphite machine to be tested is qualified according to the machining effect of the current testing area, combining the preset machining effect and the graphite machine performance testing standard, and determining the performance of the graphite machine to be improved. The machining method comprises machining the in-out tool lead from the blank offset of the graphite electrode 200 according to the set in-out tool lead. The present application provides real data basis for effectively judging, distinguishing and improving the machining performance of the graphite high-speed machine, and provides a machining method for effectively improving the machining effect.

Description

Technical Field

[0001] This invention relates to inspection methods and tools for machining graphite electrodes using graphite machining, and to machining methods thereof, belonging to the field of graphite electrode machining. Background Technology

[0002] Graphite, as an electrode material, possesses advantages such as high strength, good machinability, excellent thermal and electrical conductivity, fast EDM (Electronic Discharge Machining) speed in mold manufacturing, and minimal thermal deformation. The application of graphite electrodes in EDM machining of molds for new energy vehicle parts, daily necessities, and home appliances is becoming increasingly widespread. With the growing demand for improved efficiency in injection mold manufacturing, the need for high-speed graphite milling machines is also increasing. However, current high-speed graphite milling machines still face many technical challenges when machining needle-shaped or micro-fine graphite electrodes. These include the ease with which graphite electrodes can break during machining, difficulty in guaranteeing surface quality and machining accuracy, low processing efficiency and long processing times, and high electrode scrap rates. Ensuring that high-speed graphite machines operate without problems in graphite processing and determining whether their machining performance can be achieved are urgent issues that need to be addressed. Summary of the Invention

[0003] This invention provides a method and tools for inspecting graphite electrodes processed by graphite machining, as well as a processing method, aiming to at least solve one of the technical problems existing in the prior art. Therefore, the method and tools for inspecting graphite electrodes processed by graphite machining proposed in this invention can provide real data for effectively judging, distinguishing, and improving the processing performance of high-speed graphite machines. At the same time, by improving the processing method of graphite electrodes, the processing effect can be effectively improved.

[0004] The technical solution of this invention relates, in one aspect, to an inspection tool for machining graphite electrodes, comprising:

[0005] Inspection areas for continuous machining of different circular arcs, continuous machining of small holes, inspection areas for thin-walled slopes, inspection areas for thin-walled straight bodies, inspection areas for straight-body circles, and inspection areas for circles with slopes.

[0006] Furthermore, the continuous different arc switching machining inspection area is used to inspect whether the machine tool's acceleration and deceleration are efficient and whether the arc is overcut during high-speed machining;

[0007] The continuous small hole machining inspection area is used to inspect the machining efficiency of the graphite machine, as well as the stability and consistency of the graphite machine in high-speed small hole machining, and whether the graphite machine tool can achieve continuous tool cutting when machining graphite electrodes with a small tool at high speed.

[0008] Furthermore, the inclined thin-wall inspection area is used to inspect whether the graphite machine will overcut, chip or break the edge when processing thin-walled parts;

[0009] The straight-walled inspection area is used to inspect whether the graphite machine processes the top and bottom straight surfaces consistently, whether the surface finish of the top and bottom straight surfaces is consistent, and whether there are any chipping or vertical lines on the straight surfaces.

[0010] The straight-body circular inspection area is used to check whether the roundness of the entire circle machined from graphite is consistent, and to check whether the tool will deform when the cylinder height is 50mm.

[0011] The inclined circle inspection area is used to inspect whether the inclined circle of the graphite machine is broken or deformed, and to inspect whether the graphite machine vibrates and deforms the workpiece during the processing of small needles.

[0012] Another aspect of the technical solution of the present invention relates to an inspection method for graphite electrodes machined from graphite, applied to the inspection tool for graphite electrodes machined from graphite as described in the above embodiments; the inspection method includes the following steps:

[0013] S100. Input the multiple inspection areas of the testing equipment and the corresponding processing procedures of the inspection areas into the graphite machine to be inspected;

[0014] S200: After determining the current inspection area and its current processing step through the graphite machine to be inspected, start the graphite machine to process the current inspection area;

[0015] S300. Based on the current processing effect in the inspection area, combined with the preset processing effect and the graphite machine performance inspection standard, determine whether the corresponding performance of the graphite machine to be inspected is qualified, and determine the performance of the graphite machine that needs to be improved.

[0016] S400, Repeat steps S200 to S300 until the graphite machine to be inspected has completed the processing of all inspection areas of the testing equipment.

[0017] Furthermore, based on the set infeed and outfeed leads, it is necessary to inspect the graphite machine for machining the infeed and outfeed leads from the graphite electrode blank offset.

[0018] Furthermore, in the raw materials of the graphite electrode, the particle size of the graphite material is 2μm to 5μm and the bulk density of the graphite material is 1.77 to 1.85 g / cm3.

[0019] Another aspect of the technical solution of the present invention relates to a processing method for processing graphite electrodes using a graphite machine, the processing method comprising the following steps: according to the set infeed and outfeed leads, the graphite machine processes the infeed and outfeed leads from the blank of the graphite electrode.

[0020] Furthermore, after the bottom surface of the graphite electrode is fixed to the pad with screws, the pad is fixed to the worktable of the graphite machine.

[0021] Furthermore, the graphite machine is equipped with a diamond-coated cutting tool.

[0022] Furthermore, during the processing, a dry-cutting micro-blowing air suction cooling method is used for cleaning.

[0023] The beneficial effects of this invention are as follows.

[0024] The present invention provides a testing method, tools, and processing method for processing graphite electrodes on a graphite machine. This method can provide real data to effectively improve the processing performance of high-speed graphite machines, effectively distinguish the processing performance of different graphite machines, effectively determine whether a graphite machine has reached the processing level of a high-speed graphite machine, and effectively improve the processing effect by improving the processing method of graphite electrodes.

[0025] This invention refines the 3D model design of a high-speed graphite machine based on processing performance data obtained from testing, and designs a reasonable processing method, realizing the development of processing technology. Furthermore, based on various manufacturers and models of high-speed graphite machines, it summarizes and designs an inspection tool with multiple inspection zones. These zones include an inspection zone for continuous machining of different arcs to test the efficiency of the machine's acceleration and deceleration, and to check for overcutting during high-speed machining of arcs; an inspection zone for continuous machining of small holes; an inspection zone for thin-walled slopes; an inspection zone for thin-walled straight sections; an inspection zone for straight sections; and an inspection zone for sloped sections. After actual machining with the inspection tool on the graphite machine to be inspected, the overall processing accuracy and surface roughness of the high-speed graphite machine from different manufacturers and models can be quickly tested. Based on the actual machining results of the inspection tool, it can be determined whether the graphite machine to be inspected can meet the processing requirements of a high-speed graphite machine. Moreover, based on the test results of the inspection tool, the processing problems of the graphite machine to be inspected are listed one by one, providing important graphite processing performance data for graphite machine manufacturers, thereby enabling improvements to the overall performance of the graphite machine based on the actual data. Attached Figure Description

[0026] The above and / or additional aspects and advantages of the present invention will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which:

[0027] Figure 1 This is a schematic diagram of the structure of an inspection tool according to an embodiment of the present invention.

[0028] Figure 2 This is a schematic diagram of the path of the inlet and outlet tool leads according to an embodiment of the present invention.

[0029] Figure 3 This is a schematic diagram of the traditional tool insertion and withdrawal method.

[0030] Figure 4 This is a schematic diagram of the tool insertion / exit method according to an embodiment of the present invention.

[0031] Figure 5 This is a schematic diagram of the structure of the graphite electrode mounted on the pad and a schematic diagram of the path of the inlet and outlet tool leads according to an embodiment of the present invention.

[0032] Figure 6 This is a schematic diagram of the graphite electrode specifications according to an embodiment of the present invention.

[0033] Figure 7 This is a flowchart of the testing method according to an embodiment of the present invention.

[0034] Explanation of reference numerals in the attached figures:

[0035] 100. Inspection tools; 110. Inspection area for continuous machining of different arcs; 120. Inspection area for continuous machining of small holes; 130. Inspection area for thin-walled slopes; 140. Inspection area for thin-walled straight bodies; 150. Inspection area for straight-walled circles; 160. Inspection area for sloped circles; 200. Graphite electrodes; 300. Pads. Detailed Implementation

[0036] The following will provide a clear and complete description of the concept, specific structure, and technical effects of the present invention in conjunction with the embodiments and accompanying drawings, so as to fully understand the purpose, solution, and effects of the present invention. It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other.

[0037] It should be noted that, unless otherwise specified, when a feature is referred to as "fixed" or "connected" to another feature, it can be directly fixed or connected to the other feature, or indirectly fixed or connected to the other feature. Furthermore, the descriptions of "upper," "lower," "left," "right," "top," and "bottom" used in this invention are only relative to the relative positional relationships of the various components of the invention in the accompanying drawings.

[0038] Furthermore, unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art. The terminology used in this specification is for the purpose of describing particular embodiments only and not for limiting the invention. The term "and / or" as used herein includes any combination of one or more of the associated listed items.

[0039] It should be understood that although the terms first, second, third, etc., may be used in this disclosure to describe various elements, these elements should not be limited to these terms. These terms are only used to distinguish elements of the same type from one another. For example, without departing from the scope of this disclosure, a first element may also be referred to as a second element, and similarly, a second element may also be referred to as a first element.

[0040] See Figures 1 to 7The present invention provides an inspection tool 100 for machining graphite electrodes 200 using graphite machining. The inspection tool 100 includes a continuous different arc switching machining inspection area 110, a small hole continuous machining inspection area 120, a slope thin wall inspection area 130, a straight thin wall inspection area 140, a straight circle inspection area 150, and a slope circle inspection area 160.

[0041] See Figures 1 to 7 The inspection method for the graphite electrode 200 machined from graphite, according to the technical solution of the present invention, is applied to the inspection tool 100 for the graphite electrode 200 machined from graphite in the embodiments of the present invention. The inspection method includes at least the following steps:

[0042] S100. Input the multiple inspection areas of the testing equipment and the corresponding processing procedures of the inspection areas into the graphite machine to be inspected;

[0043] S200: After determining the current inspection area and its current processing step through the graphite machine to be inspected, start the graphite machine to process the current inspection area;

[0044] S300. Based on the current processing effect in the inspection area, combined with the preset processing effect and the graphite machine performance inspection standard, determine whether the corresponding performance of the graphite machine to be inspected is qualified, and determine the performance of the graphite machine that needs to be improved.

[0045] S400, Repeat steps S200 to S300 until the graphite machine to be inspected has completed the processing of all inspection areas of the testing equipment.

[0046] This invention relates to an inspection method and inspection tool 100 for machining graphite electrodes 200 using graphite machining. This method is used for machining needle-shaped or micro-scale graphite electrodes 200 using high-speed graphite machining, effectively improving machining efficiency and product yield, and solving problems such as easy breakage and difficulty in dimensional control during the machining of needle-shaped graphite electrodes 200. Based on the machining performance data of the high-speed graphite machine obtained through inspection, this invention refines the 3D model design of the machine tool and designs a reasonable machining method, realizing the development of the machining process. Furthermore, based on various manufacturers and models of high-speed graphite machines, an inspection tool 100 with multiple inspection areas is designed. The inspection areas of the testing tool include an inspection area for continuous machining of different arcs to check the efficiency of the machine tool's acceleration and deceleration and whether overcutting occurs during high-speed machining of the arc; a small hole continuous machining inspection area 120; a sloped thin-walled inspection area 130; a straight thin-walled inspection area 140; a straight circular inspection area 150; and a sloped circular inspection area 160. After the inspection tool 100 is actually processed by the graphite inspection machine, the overall processing accuracy and roughness of the graphite high-speed machine from different manufacturers and models can be quickly inspected. Based on the actual processing effect of the inspection tool 100, it can be judged whether the graphite machine to be inspected can meet the processing requirements of the graphite high-speed machine. Moreover, based on the test results of the testing tool, the processing problems of the graphite machine to be inspected are listed one by one, providing important graphite processing performance data for graphite machine manufacturers. Thus, the overall performance of the graphite machine can be improved based on the actual data.

[0047] It should be noted that in the current state of graphite motor processing, different manufacturers of high-speed graphite machines have different requirements for processing performance during design. In particular, many manufacturers have not fully confirmed the actual performance requirements of the machine tool during the design process. As a result, users cannot determine whether the machine tool can meet the current manufacturer's requirements for processing graphite electrodes 200, nor can they determine how much the processing efficiency of the high-speed graphite machine will be improved when processing this graphite electrode 200 product. The inspection method and inspection tool 100 for processing graphite electrodes 200 using a graphite machine provided by this invention effectively inspects the processing performance of the high-speed graphite machine, improves processing efficiency, improves product yield, and solves the problem of whether the machine tool meets the user's processing needs in actual graphite electrode 200 processing. It allows users to truly experience the improved processing efficiency and the stability of the processed products brought by the high-speed graphite machine, and provides real data for effectively judging whether the high-speed graphite machine meets the current processing requirements of graphite electrode 200.

[0048] See Figures 1 to 7 The processing method for high-speed machining of graphite electrodes 200 according to the technical solution of the present invention is applied to the inspection method for machining graphite electrodes 200 according to the embodiments of the present invention. The processing method includes at least the following steps: machining the entry and exit tools from the blank of the graphite electrode 200 according to the set entry and exit tool leads. Furthermore, the processing method of the present invention is applicable to the machining of extremely thin and fine graphite electrode 200 workpieces.

[0049] In some embodiments, the present invention develops processes using models and programs the models for machining according to the standards of a high-speed graphite machine. Specifically, firstly, accessories such as cutting tools and tool holders are selected to ensure that the accessories do not affect the machining effect, the machining cutting steps are reasonably arranged, and the machining methods and machining process parameters are defined.

[0050] Among them, see Figure 3 In traditional contour milling, the graphite electrode 200 is milled around each layer, resulting in a long contact area between the tool sidewall and the graphite electrode 200 sidewall during tool entry and exit. This generates an axial force during tool entry and exit. When the cutting force is too large, the workpiece vibrates, leading to chipping. See also... Figure 2 and Figure 4 , Figure 5 In the graphite electrode 200 processing method of the present invention, the lead wires for the entry and exit of the tool are processed from the blank of the graphite electrode 200 at an offset. Specifically, the tool enters and exits from above the graphite electrode 200 in a point contact manner, so that when machining downward in the axial direction, the vibration generated by the downward cutting force can be effectively avoided, so that the graphite electrode 200 processing method of the present invention can meet the processing requirements.

[0051] Specifically, when the tool of this invention enters using a lead wire, the tool is completely outside the graphite electrode 200. After completing the first layer of machining, it feeds downward along the Z-axis. In the traditional equal-height machining method (where the sidewall of the tool at a fixed Z-axis height directly contacts the sidewall of the graphite electrode at a fixed Z-axis height), axial vibration is generated when the Z-axis moves downward, which easily leads to chipping and corner breakage when machining needle-shaped or thin-walled graphite electrodes. However, the lead wire machining method of this invention means that the tool is out of the cutting state during the Z-axis descent phase, thus completely eliminating vibration. That is, there is no chip force in the Z-axis direction, and no vibration is generated. Furthermore, the clockwise entry method into the workpiece generates very weak cutting force, which can effectively reduce the impact on thin-walled structures, thereby effectively ensuring that thin-walled graphite electrodes do not experience chipping or corner breakage.

[0052] Furthermore, the present invention can determine whether the processing performance of the graphite high-speed machine can meet the processing requirements based on the processing effect and efficiency of the graphite high-speed machine on the inspection tool 100, and determine whether each performance of the graphite high-speed machine meets the processing requirements based on the processing effect of each inspection area of ​​the inspection tool 100.

[0053] This invention provides a reasonable and innovative lead-in / lead-out machining method. The way the process parameters are set plays a decisive role in improving the milling effect of extremely thin and fine graphite electrode 200 workpieces. Specifically, many factors affect the cutting force of a graphite milling machine, such as cutting parameters, milling method, and graphite material properties. This invention effectively reduces the impact of cutting force and its resulting cutting impact on the machining effect by selecting reasonable cutting parameters and milling methods, thereby reducing the influence of the machining process on the graphite milling result.

[0054] In some embodiments, see Figure 6 Before inspecting the graphite electrode 200, this invention first determines whether the parameters of the raw material for the graphite electrode 200 workpiece meet the set conditions. Specifically, this invention sets the conditions that the raw material for the graphite electrode 200 must meet, including a graphite particle size of 2μm to 5μm and a graphite bulk density of 1.77 to 1.85 g / cm³. Further, the dimensions of the graphite blank are length * width * height = 35 mm * 35 mm * 100 mm. In a specific embodiment, this invention requires that the raw material for the graphite electrode 200 must meet the following conditions: a graphite particle size of 2μm to 5μm and a graphite bulk density of 1.77 to 1.85 g / cm³, and a graphite blank dimension of length * width * height = 35 mm * 35 mm * 100 mm. It should be noted that when the particle size of the graphite material is too large or the bulk density is too small, air bubbles are easily generated within the graphite electrode. Therefore, when the particle size of the graphite electrode is greater than a certain value, and the cutting allowance or cutting amount is small, the graphite electrode workpiece is prone to chipping and edge breakage. Therefore, when machining needle-shaped or thin-sheet graphite workpieces, this invention eliminates the influence of the material itself on the processing effect by limiting the conditions that the graphite raw materials must meet, thereby more accurately analyzing the shortcomings of the machine tool performance and processing technology.

[0055] In some embodiments, the design of the graphite electrode 200 processing and inspection tool 100 of the present invention is based on the manufacturer's requirements for the processing performance of the high-speed graphite machine, the type of processed products, the experience of processing efficiency, the experience of the machine tool's processing performance, and the working conditions in the processing application. See also Figure 1 To address the various processing requirements of high-speed graphite machines, an inspection tool 100 with multiple inspection areas is designed. The inspection areas of the inspection tool 100 include an inspection area for continuous switching of different arcs to check whether the machine tool's acceleration and deceleration are efficient and whether the arcs are overcut during high-speed processing, as well as a small hole continuous processing inspection area 120, a slope thin-wall inspection area 130, a straight thin-wall inspection area 140, a straight circle inspection area 150, and a slope circle inspection area 160.

[0056] In some embodiments, the inspection tool 100 of the present invention is provided with an inspection zone for continuously switching between different arcs to inspect the efficiency of machine tool acceleration and deceleration and whether overcutting occurs during high-speed machining of the arc. See [link to relevant documentation]. Figure 1 The inspection area is equipped with multiple arcs of different sizes, and these arcs are continuous. Specifically, the inspection area of ​​the inspection tool 100 is continuously processed with arcs of different sizes by the graphite machine to be inspected. The graphite machine needs to switch processing modes continuously during processing, so as to check whether the acceleration and deceleration of the graphite machine is efficient, whether the graphite machine will produce phenomena such as tool bounce or overcutting when processing the graphite electrode 200 with different arcs of different sizes, and whether the surface finish and precision of the top and bottom of the arc have excessive deviations.

[0057] In some embodiments, the inspection tool 100 of the present invention is provided with a small hole continuous processing inspection area 120, see [link to relevant documentation]. Figure 1 The inspection area has multiple small holes with a high density on its upper surface. Specifically, the inspection area of ​​the inspection tool 100 is continuously processed with multiple small holes by the graphite machine to be inspected. The dynamic processing performance of the graphite machine in the continuous spiral processing of multiple small holes can be judged based on the processing effect. In particular, the processing efficiency of the high-speed graphite machine can be judged based on the processing effect of the graphite machine on the honeycomb holes, and the stability and consistency of the graphite machine in the high-speed processing of small holes can be determined. It can also be determined whether the graphite machine tool can achieve tool breakage when performing high-speed cutting of the graphite electrode 200 with a small tool.

[0058] In some embodiments, the inspection tool 100 of the present invention is provided with a slope thin-wall inspection area 130, see [link to documentation]. Figure 1 The inspection area has a tapered structure that is thinner at the top and thicker at the bottom. Because its walls are only a few millimeters thick, it is extremely prone to deformation or breakage, and the top and bottom dimensions of the slope must be strictly matched. Specifically, the inspection area of ​​the inspection tool 100 is machined with a slope thin wall using a graphite machine to be inspected. The stability of the graphite machine in dynamic processing can be judged based on the processing effect. Specifically, the slope thin wall inspection area 130 of the inspection tool is processed by the graphite machine to check whether the graphite machine will overcut, chip, or break the edge when processing thin-walled parts.

[0059] In some embodiments, the inspection tool 100 of the present invention is provided with a straight, thin-walled inspection area 140, see [link]. Figure 1The thin-walled section of the inspection area is perpendicular to the bottom surface. High perpendicularity is required during processing. The wall thickness is relatively thin (e.g., only 0.5–3 mm) and the depth-to-width ratio (height / wall thickness) is large (up to 10:1 or even higher). Specifically, after the graphite inspection machine processes the thin-walled section of the inspection tool 100, it is determined whether the processing effect on the top and bottom surfaces of the graphite inspection machine is consistent, whether the surface finish is consistent, and whether phenomena such as tool bounce or vertical lines appear on the straight surface. This determines whether the graphite inspection machine meets the requirements for processing the thin-walled section of the graphite electrode 200.

[0060] In some embodiments, the inspection tool 100 of the present invention is provided with a straight circular inspection area 150, see [link]. Figure 1 The wall thickness of this inspection area is relatively thin (e.g., 0.5–3 mm), and the sidewalls must be perpendicular to the bottom surface. It requires high cylindricity and perpendicularity (usually ≤0.01 mm), and a large height (H) to diameter (D) ratio (e.g., H / D ≥ 5:1). Therefore, it is prone to vibration or deformation during processing. Specifically, after machining the aforementioned inspection area of ​​the inspection tool 100 into a straight circle using the graphite machine to be inspected, the roundness of the entire circle machined by the graphite machine is judged to be consistent, and it is checked whether tool deformation occurs when the cylinder height is 50 mm.

[0061] In some embodiments, the inspection tool 100 of the present invention is provided with a slope circle inspection area 160, see [link / reference] Figure 1 The inspection area has a specific draft angle (usually 1° to 15°), and the sidewalls are inclined rather than vertical, with different diameters at the top and bottom to form a conical transition. Specifically, the inspection area of ​​the inspection tool 100 is machined into a tapered circle by a graphite machine to be inspected, forming a tapered circle with a top diameter of 0.3mm-0.5mm and a bottom diameter of 1mm-2mm. The machining effect is used to determine whether there is any breakage or deformation, and to check whether the graphite machine generates vibration or other phenomena that cause workpiece deformation during the processing of micro-needles.

[0062] It should be noted that using the inspection method and inspection tool 100 of this invention, it is possible to quickly verify whether the high-speed graphite machine can meet the user's processing performance requirements, and to specifically determine the range of processing performance of the high-speed graphite machine. It also demonstrates the advantages and disadvantages of different machine tool manufacturers in a horizontal comparison using the same testing tool. This invention identifies the problems in processing graphite electrodes 200 using the verification method, determines the comprehensive dynamic processing performance of the graphite machine, and determines the vibration suppression capability of the graphite machine in processing small features, the efficiency in processing micro-holes, the ability of the graphite machine to handle arcs of different sizes, and the smooth transition effect of the graphite machine. This helps to ensure processing quality while improving processing efficiency. Based on actual trial cutting processing, this invention formulates the processing content for inspecting the graphite machine (designing inspection tools 100 with different inspection areas), designs a reasonable processing method for graphite electrodes 200, and summarizes and lists some unstable data that occur during processing, fully reflecting the true processing performance of the graphite machine to be inspected.

[0063] Understandably, in the traditional debugging and processing of high-speed graphite machines, technicians first process the raw materials according to the shape of the customer's product. Because the shape of the customer's product is uncertain, the technician can only judge which aspect of the machine tool's performance is problematic based on the processing effect and their own experience. After adjusting the performance, the processing is verified again. If the technician's judgment is incorrect, the cause needs to be found again and the processing is repeated. The verification process is repetitive and tedious, and it is highly dependent on the technician's technical level. The length of the debugging cycle is difficult to control. The inspection method of this application first summarizes various representative processing shapes of graphite electrode 200, pre-designs the test area of ​​the test equipment, and processes the corresponding area with a graphite machine. Based on the processing of a specific graphite electrode 200 shape, the processing level that the graphite machine can achieve and its specific processing performance advantages and disadvantages can be judged intuitively. For example, after completing the processing of the inclined thin-walled test area 130, it can be determined whether the graphite machine will cause overcutting, corner chipping, or edge chipping when processing thin-walled parts. Thus, after completing the processing of the test equipment 100, the technician can determine the advantages and disadvantages of the graphite machine in various aspects, saving the process of manual judgment and repeated processing verification. This provides an effective basis for evaluating the graphite electrode 200 processing capability of the high-speed graphite machine and a reliable basis for process optimization and quality control.

[0064] In some embodiments, in the processing method of the graphite electrode 200 for high-speed machining of graphite according to the present invention, the graphite electrode 200 workpiece is fixed on the pad 300 by means of screw holes and screws. See also Figure 5In the clamping method of the pad 300 used in this invention, firstly, the bottom surface of the graphite blank is machined using a cutting tool, and then the bottom surface of the graphite blank is drilled and tapped. Then, holes are drilled in the pad 300 according to the size of the graphite electrode 200. A robotic arm places the graphite electrode 200 blank onto the drilled holes in the pad 300, ensuring that the drilled positions of the graphite electrode 200 and the pad 300 correspond. Then, screws are inserted into and tightened in the drilled holes in the pad 300 and the graphite electrode 200, fixing the entire fixture with the graphite electrode 200 and the drilled holes onto the worktable. Furthermore, the pad 300 has screw slots in all four directions, allowing the pad 300 to be fixed to the graphite machine worktable using screws.

[0065] It should be noted that traditional methods for processing and installing graphite electrode 200 workpieces mainly include adhesive bonding and special fixtures. The former uses adhesive to fix the graphite electrode 200 to the steel plate for processing. When the workpiece is finished and needs to be removed, the adhesive must be cleaned off before the graphite electrode 200 can be released. Furthermore, cleaning the adhesive from the graphite electrode 200 can easily damage the workpiece. Using existing special fixtures for graphite electrode 200, the graphite electrode 200 is only subjected to force in the clamping direction. When the clamping direction is not the primary force direction, resonance can easily occur during processing, leading to overcutting. Simultaneously, the graphite electrode 200 at the clamping point is also prone to deformation, resulting in dimensional errors in the workpiece. The clamping method using the pad 300 in this invention involves first machining the bottom surface of the graphite blank into a reference surface, then drilling several screw holes, such as two M10 process screw holes, on the bottom of the graphite electrode 200. The drilled graphite electrode 200 blank is then placed on the pad 300 and connected by screws, for example, M10 hexagonal socket screws are used to tighten the connection. The size of the flat pad 300 can be determined according to the dimensions of the graphite electrode 200. In a specific embodiment of this invention, a flat pad 300 with dimensions of 500mm x 400mm is used. Furthermore, the number of process screw holes on the pad 300 is determined according to the size of the workpiece. This invention uses screws to fix the lower end of the graphite electrode 200 to the pad 300, providing a downward locking force to the entire workpiece. Furthermore, the pad 300 clamping method of this invention allows the graphite electrode 200 to be removed after machining by loosening the screws, making operation convenient and preventing workpiece deformation due to clamping.

[0066] In some embodiments, in the machining method of graphite electrode 200 for high-speed machining of graphite according to the present invention, a diamond-coated tool is selected. Unlike tools with ordinary coatings, the diamond-coated tool used in the present invention has advantages such as high temperature resistance and wear resistance, which can effectively avoid workpiece deformation caused by tool deformation due to large cutting depth. Furthermore, for machining the depth of the graphite electrode 200, the tool extension length needs to be considered to ensure that the tool has sufficient strength, thereby preventing electrode breakage due to radial runout of the tool during machining. In a specific embodiment of the present invention, the tool extension length after clamping can be 100 mm, thereby ensuring radial runout <0.003 mm. Specifically, considering the above, the embodiment of the present invention selects a tool with specifications of d12*55*D12*150L for machining. Furthermore, the cutting edge of the tool must be sharp to reduce cutting force. Furthermore, in the selection of tool holders, thick-walled sintered tool holders can be used, and a spring clip fixing method with high rigidity and stability can be adopted to take advantage of its strong clamping force and low deformation. Specifically, considering the above, the embodiment of the present invention selects a thick-walled sintered chuck to clamp the tool in order to improve the processing effect and stability.

[0067] In some embodiments, the processing method of graphite electrode 200 for high-speed machining of graphite according to the present invention adopts a dry cutting micro-blowing dust suction processing and cooling method. The micro-blowing can promptly clean the graphite powder on the tool and allow the dust collector to suck it away. In contrast, the traditional processing method using spray cutting fluid is prone to the phenomenon that the cutting fluid such as lubricating oil bends the workpiece, which can lead to chipping. The method of the present invention uses air blowing and dust suction to promptly clean the graphite dust on the surface of the workpiece, which helps to reduce tool wear, extend the tool's service life, and keep the tool sharp for cutting.

[0068] In some embodiments, the machining method of the graphite electrode 200 for high-speed graphite machining of the present invention optimizes the machining cutting steps by machining the lead wires of the tool at an offset position on the graphite electrode 200 blank, effectively avoiding vibration caused by downward cutting force during axial downward machining. Specifically, firstly, the graphite electrode 200 is assembled onto the worktable of the high-speed graphite machine, and the graphite electrode 200 is automatically centered. Then, the lead wire entry and exit cutting mode is set for the machining system according to the machining shape, so that the cutting speed and cutting path can effectively eliminate axial force when entering from the lead wire, thereby avoiding resonance caused by axial force during the cutting process, reducing the instability caused by the tool during cutting. At the same time, the lead wire exit method can effectively cool the tool and clean the graphite powder adhering to the tool in time, which can effectively extend the tool life and ensure that the sharpness of the tool is not reduced due to the graphite powder adhering, thus preventing vibration during the cutting process.

[0069] Then, the roughing machining program for the graphite machine is started. The tool motion control process during roughing includes: first, roughing is performed on T1, with a radial allowance of 10mm on one side and an axial allowance of 0.5mm; the machining parameters are as follows: tool diameter: φ12mm; machining accuracy: 0.02mm; spindle speed: T1: S4000~S6000rpm; feed rate: T1: F8000~F10000mm / min, Z-step distance 1mm; during the roughing process, the tool is controlled to move according to the size of the needle-shaped graphite, the machining path, and the machining shape. The analysis of needle-shaped graphite determines the appropriate tool size for rough machining, ensuring tool stability and cutting speed. Furthermore, the overall rough machining of the needle-shaped micro-graphite electrode 200 must consider whether the allowance for each machining step provides sufficient strength for the electrode. This is a key factor in preventing electrode breakage (radial allowance slightly smaller than the tool diameter). For rough machining of the needle-shaped micro-faceted graphite, the allowance during the rough machining of the graphite electrode 200 should not be too small, and semi-finishing steps should be eliminated to ensure the strength of the machined area and prevent deformation.

[0070] Then, through experimental processing, this scheme can produce ultra-fine needle-shaped graphite electrodes 200 with a diameter of 0.2-0.6 mm and a height of 80 mm by selecting diamond-coated tool T1 for roughing and T2 for finishing, and by using reasonable processing methods and parameters. This achieves a high-efficiency processing scheme for precision micro-graphite electrodes 200.

[0071] The present invention provides a machining method for graphite electrodes 200 used in graphite machining, which improves the process flow of needle-type electrode production, effectively reduces the production defect rate, and reduces the economic cost of machining materials. The present invention provides reasonable and innovative lead-in / out machining parameters, which can effectively improve the surface quality of the machined workpiece and the tool durability in the milling of needle-type micro-graphite electrodes 200. Since many factors affect cutting force, cutting parameters, milling methods, and graphite material properties all influence the cutting force. The present invention, by selecting reasonable cutting parameters and milling methods, can effectively reduce the cutting force and the resulting cutting impact, reduce tool deflection and tool bounce, and select high-strength graphite materials to improve the structural rigidity of the thin-walled graphite electrode 200, thereby reducing edge chipping of the thin-walled graphite electrode 200 and solving machining problems.

[0072] The above description is merely a preferred embodiment of the present invention. The present invention is not limited to the above-described embodiments. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of this disclosure, as long as they achieve the same technical effects, should be included within the scope of protection of this disclosure and fall under the protection scope of the present invention. Within the protection scope of the present invention, the technical solutions and / or implementation methods can have various modifications and variations.

Claims

1. An inspection tool (100) for machining graphite electrodes (200) using graphite, characterized in that, include: The system includes a continuous different arc switching processing inspection area (110), a small hole continuous processing inspection area (120), a slope thin-walled inspection area (130), a straight thin-walled inspection area (140), a straight circle inspection area (150), and a slope circle inspection area (160); wherein, the continuous different arc switching processing inspection area (110) is provided with multiple arcs of different sizes and the multiple arcs are continuous; the upper surface of the small hole continuous processing inspection area (120) is provided with multiple small holes; The inclined thin-walled inspection area (130) is provided with a conical structure that is thinner at the top and thicker at the bottom; the straight thin-walled inspection area (140) has its straight thin-walled structure perpendicular to its bottom surface; the sidewall of the straight circular inspection area (150) is perpendicular to its bottom surface, and the ratio of the height to the diameter of the straight circular inspection area (150) is greater than 5:1; the sidewall of the inclined circular inspection area (160) is inclined, and the upper diameter of the inclined circular inspection area (160) is different from the lower diameter to form a conical surface for transition; The continuous different arc switching machining inspection area (110) is used to inspect whether the machine tool acceleration and deceleration are efficient and whether the arc is overcut during high-speed machining; The inclined thin-wall inspection area (130) is used to inspect whether the graphite machine will overcut, chip or break the edge when processing thin-walled parts; The straight thin-walled inspection area (140) is used to inspect whether the processing effect of the graphite machine on the top and bottom straight surfaces is consistent, whether the surface finish of the top and bottom straight surfaces is consistent, and whether the straight surfaces exhibit chipping or vertical lines.

2. The inspection tool (100) for machining graphite electrodes (200) according to claim 1, characterized in that, The small hole continuous machining inspection area (120) is used to inspect the machining efficiency of the graphite machine, as well as the stability and consistency of the graphite machine in high-speed small hole machining, and whether the graphite machine tool can achieve continuous cutting when performing high-speed small-cut machining on the graphite electrode (200).

3. The inspection tool (100) for machining graphite electrodes (200) according to claim 1, characterized in that, The straight-body round inspection area (150) is used to inspect whether the roundness of the entire circle machined by the graphite machine is consistent, and to check whether the tool will deform when the cylinder height is 50mm. The inclined circle inspection area (160) is used to inspect whether the inclined circle of the graphite machine is broken or deformed, and to inspect whether the graphite machine generates vibration that causes the workpiece to deform during the processing of small needles.

4. A method for inspecting graphite electrodes (200) used in graphite machining, characterized in that, Inspection tool (100) for high-speed machining of graphite electrodes (200) according to any one of claims 1 to 3. The inspection includes the following steps: S100. Input the multiple inspection areas of the testing equipment and the corresponding processing procedures of the inspection areas into the graphite machine to be inspected; S200: After determining the current inspection area and its current processing step through the graphite machine to be inspected, start the graphite machine to process the current inspection area; S300. Based on the current processing effect in the inspection area, combined with the preset processing effect and the graphite machine performance inspection standard, determine whether the corresponding performance of the graphite machine to be inspected is qualified, and determine the performance of the graphite machine that needs to be improved. S400, Repeat steps S200 to S300 until the graphite machine to be inspected has completed the processing of all inspection areas of the testing equipment.

5. The testing method according to claim 4, characterized in that, According to the set infeed and outfeed leads, it is necessary to check the infeed and outfeed of the graphite machine from the blank offset of the graphite electrode (200).

6. The testing method according to claim 4, characterized in that, The raw material of the graphite electrode (200) has a particle size of 2μm to 5μm and a bulk density of 1.77 to 1.85 g / cm3.

7. A method for machining graphite electrodes (200) for high-speed machining of graphite, applied to the inspection tool (100) for high-speed machining of graphite electrodes (200) as described in any one of claims 1 to 3, characterized in that, The processing method includes the following steps: According to the set infeed and outfeed leads, the graphite machine processes the infeed and outfeed from the blank offset of the graphite electrode (200).

8. The processing method according to claim 7, characterized in that, After the bottom surface of the graphite electrode (200) is fixed to the pad (300) with screws, the pad (300) is fixed to the worktable of the graphite machine.

9. The processing method according to claim 7, characterized in that, The graphite machine is equipped with diamond-coated cutting tools.

10. The processing method according to claim 7, characterized in that, During the processing, a dry-cutting micro-blowing air suction cooling method is used for cleaning.

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