New energy motor flat wire stator hairpin wire cutting device and composite cutting die machining method

Abstract

The invention discloses a new energy motor flat wire stator card issuing wire cutting-off device and a composite cutting die machining method, the cutting-off device comprises a positioning guide assembly and a composite cutting die, the positioning guide assembly comprises a cutter clamping block, a movable plate and a fixed plate, and a first elastic reset piece is arranged between the cutter clamping block and the movable plate; the composite cutting die comprises a cut-off tool and a base body, the base body comprises a guide seat and a cutter seat, the cut-off tool is provided with a male die, the male die is provided with a first cutting edge, the cutter seat is provided with a female die, the female die is provided with a second cutting edge, the guide seat is provided with a concave through groove in sliding fit with the male die, and the cut-off tool is arranged on a cutter clamping block. The male die can be driven by the cutter clamping block to stretch into or retreat from the female die. According to the device, through cooperative cooperation of the positioning guide assembly and the composite cutting die and secondary guide design, high precision and high stability in the hairpin line cutting-off process are achieved, the cutting-off efficiency and the notch quality are effectively improved, and meanwhile the burr and deformation risks are reduced.

Description

Technical Field

[0001] This invention relates to the technical field of new energy motor production equipment, specifically a new energy motor flat wire stator hairpin wire cutting device and a composite die processing method. Background Technology

[0002] In the manufacturing of flat wire motors for new energy vehicles, the cutting of the flat wire stator hairpin wire is a crucial step in ensuring the quality of subsequent processes such as flaring, twisting, laser welding, and paint coating. The stability and reliability of the cutting device directly affect the precision and efficiency of this process. Currently, traditional hairpin wire cutting devices still have many significant drawbacks in practical applications, such as poor cutting quality and the tendency for the copper wire to wobble during cutting, leading to an increased defect rate. Summary of the Invention

[0003] This invention aims to at least solve one of the technical problems existing in the prior art. To this end, this invention provides a device for cutting the hairpin wire of a flat stator in a new energy motor and a method for processing with a composite die.

[0004] A new energy motor flat wire stator hairpin wire cutting device according to an embodiment of the present invention includes a positioning and guiding assembly and a composite die. The positioning and guiding assembly includes a cutter clamping block, a moving plate, and a fixed plate spaced apart along the cutting direction of the cutting device. The moving plate is slidably disposed on the fixed plate along the cutting direction of the cutting device. A first elastic reset member is provided between the cutter clamping block and the moving plate. The first elastic reset member is used to provide a first elastic force for the moving plate to approach the cutter clamping block. The composite die includes a cutting blade and a base body. The base body includes a guide seat and a cutter seat. The cutting blade is provided with a punch, the punch having a first cutting edge; the cutting blade seat is provided on the fixed plate, the cutting blade seat is provided with a die, the die having a second cutting edge; the guide seat is provided on the moving plate, the guide seat having a concave through groove that slides with the punch; the punch passes through the concave through groove and engages with the die; the cutting blade is provided on the cutting blade clamping block, so that the punch can extend into or retract from the die under the drive of the cutting blade clamping block, so that the second cutting edge and the first cutting edge cut each other to cut the hairpin wire located therein.

[0005] A new energy motor flat wire stator hairpin wire cutting device according to an embodiment of the present invention has at least the following beneficial effects: By driving the cutter clamping block to press down on the cutter holder, the punch of the cutting blade extends into the concave die through the concave groove, so that the second cutting edge and the first cutting edge shear each other to cut the hairpin wire located therein. The sliding cooperation of the moving plate and the fixed plate forms a preliminary positioning guide. On this basis, the concave groove of the guide seat and the punch cooperate, and the punch of the cutting blade and the concave die of the cutter holder mesh with each other to form a second positioning guide. Thus, a positioning guide is formed for the cutting blade-upper plate-guide seat-cutter holder-lower plate, realizing the positioning and movement guidance of the cutting device during operation, effectively ensuring the high precision requirements of the cutting process. This device achieves high precision and high stability in the hairpin wire cutting process through the coordinated cooperation of the positioning guide component and the composite die and the two-stage guide design. Its elastic reset structure ensures the rapid reset and continuity of the cutting action, effectively improving the cutting efficiency and cut quality, while reducing the risk of burrs and deformation, thereby ensuring the reliability and consistency of new energy motor stator production.

[0006] According to some embodiments of the present invention, the fixed plate is provided with at least one first guide post, and the movable plate is provided with at least one second guide post that slides in cooperation with the first guide post.

[0007] According to some embodiments of the present invention, the cutter seat is provided with a wire pressing and loosening mechanism, the cutter seat is provided with a wire passage groove, the wire pressing and loosening mechanism includes a contouring pressure plate and a second elastic reset member, the contouring pressure plate is slidably disposed in the wire passage groove along the shearing direction, and the second elastic reset member is disposed between the cutter seat and the guide seat, so that the contouring pressure plate is away from the guide seat.

[0008] According to some embodiments of the present invention, the second elastic reset member includes a telescopic positioning pin, the two ends of which are respectively connected to a contour pressure plate and a guide seat.

[0009] According to some embodiments of the present invention, the cutter holder assembly is further provided with a wire guiding mechanism, the wire guiding mechanism including a first limiting block, a second limiting block, a third limiting block and an adjusting member, the first limiting block, the second limiting block and the third limiting block forming a wire guiding channel for the hairpin wire to pass through, the adjusting member being used to drive the first limiting block and the second limiting block to move away from or closer to each other, and to drive the third limiting block to move closer to or away from the first limiting block.

[0010] According to some embodiments of the present invention, the adjusting member further includes a forward and reverse screw and a knob, wherein the first limiting block and the second limiting block are respectively threadedly connected to the forward thread section and the reverse thread section of the forward and reverse screw, and the knob is disposed at the end of the forward and reverse screw.

[0011] According to some embodiments of the present invention, the punch is provided with a chip removal groove, which is located on the side of the cutting blade near the die.

[0012] A composite die-cutting method according to an embodiment of the present invention is used to process the composite die in the hairpin wire cutting device as described in any of the above claims, the composite die-cutting method comprising: Select a workpiece blank, the workpiece blank including a first blank for machining a cutting blade and a second blank for machining a base body; Pre-process the workpiece blank; The first blank is cut by a machining tool according to the first preset geometric center; The second blank is cut using a machining tool according to the second preset geometric center. First, a concave channel is cut out on the basis of the second blank. The concave channel simultaneously forms a concave mold and a concave through groove. Then, the second blank is cut to separate the concave mold and the concave through groove. At the same time, the second blank is divided into a guide seat and a cutter seat.

[0013] According to some embodiments of the present invention, the step of cutting the second blank using a machining tool according to a second preset geometric center involves first cutting a concave channel on the second blank, the concave channel simultaneously forming a die and a concave through groove, and then cutting the second blank to separate the die and the concave through groove, while the second blank is divided into a guide seat and a cutter seat, comprising: The clearance between the punch of the cutting blade and the concave channel of the second blank is controlled to be within a preset range, which is 0.006~0.008 mm.

[0014] According to some embodiments of the present invention, the machine tool is equipped with a probe head, and the composite die-cutting method further includes: Obtaining the first preset geometric center and the second preset geometric center includes: The probe is controlled to contact and sense the edges of the four sides of the workpiece. At least two equally divided measurement points are selected on two opposite sides and the Y-axis coordinate value of each measurement point is recorded. At least two equally divided measurement points are selected on the other two opposite sides and the X-axis coordinate value of each measurement point is recorded. The number of measurement points on each pair of opposite sides is the same. The average value of all measured Y-axis coordinate values ​​is used as the Y-coordinate of the first preset geometric center of the workpiece in the top view. The average value of all measured X-axis coordinate values ​​is used as the X-coordinate of the second preset geometric center of the workpiece in the top view. The second preset geometric center is obtained using the same method as the first preset geometric center.

[0015] Other features and advantages of the invention will be set forth in the description which follows, and will be apparent in part from the description, or may be learned by practicing the invention. Attached Figure Description

[0016] The present invention will be further described below with reference to the accompanying drawings and embodiments, wherein: Figure 1 This is a schematic diagram of the overall structure of some embodiments of the present invention; Figure 2 This is a schematic diagram of the structure of the positioning and guiding component according to some embodiments of the present invention; Figure 3 This is a schematic diagram of the structure of the composite die in some embodiments of the present invention; Figure 4 This is a schematic diagram of the cutter holder in some embodiments of the present invention; Figure 5 This is a schematic diagram of the wire pressing and loosening mechanism in some embodiments of the present invention; Figure 6 This is a schematic diagram of the wire-passing adjustment mechanism according to some embodiments of the present invention; Figure 7 This is a schematic diagram of the first blank in some embodiments of the present invention; Figure 8 This is a schematic diagram of the second blank in some embodiments of the present invention; Figure 9 This is a schematic diagram illustrating the selection of measurement points for the first blank in some embodiments of the present invention; Figure 10 This is a schematic diagram illustrating the selection of measurement points for the second blank in some embodiments of the present invention; Figure 11 This is a schematic diagram of the cutting path of the first blank in some embodiments of the present invention; Figure 12 This is a schematic diagram of the cutting path of the second blank in some embodiments of the present invention; Figure 13 This is a schematic diagram of the cutting path of the first blank in some embodiments of the present invention, wherein (a) is a front view and (b) is a right view; Figure 14 This is a schematic diagram of the cutting path for cutting the second blank into a guide seat and a cutter seat according to some embodiments of the present invention; Figure 15 This is a schematic diagram of the cutting path of the second blank through the groove in some embodiments of the present invention; Figure 16 This is a flowchart of a composite die-cutting method according to some embodiments of the present invention; Icon labels: Positioning guide assembly 100, cutter clamping block 110, mounting groove 111, moving plate 120, second guide post 121, fixing plate 130, first guide post 131, positioning pin 132, chip removal channel 133, first elastic reset member 140; Composite die 200, cutting blade 210, punch 211, chip removal groove 212, guide seat 220, concave through groove 221, cutting blade seat 230, die 231, wire guide groove 232, wire pressing and loosening mechanism 240, contouring pressure plate 241, second elastic reset component 242, telescopic positioning pin 243, wire guide adjustment mechanism 250, first limit block 251, second limit block 252, forward and reverse screw 253, screw seat 254, fixing sleeve 255, third limit block 256, locking screw 257, knob part 258, wire guide cover plate 259. Detailed Implementation

[0017] Embodiments of the present invention are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and should not be construed as limiting the present invention.

[0018] In the description of this invention, it should be understood that the orientation descriptions, such as up, down, etc., are based on the orientation or positional relationship shown in the drawings and are only for the convenience of describing this invention and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this invention.

[0019] In the description of this invention, "multiple" refers to two or more. The use of "first" and "second" is for distinguishing technical features only and should not be construed as indicating or implying relative importance, or implicitly indicating the number of indicated technical features or their sequential relationship.

[0020] In the description of this invention, unless otherwise explicitly defined, terms such as "set up," "install," and "connect" should be interpreted broadly, and those skilled in the art can reasonably determine the specific meaning of the above terms in this invention in conjunction with the specific content of the technical solution.

[0021] The technical solution of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the embodiments described below are some embodiments of the present invention, not all embodiments.

[0022] Reference Figure 1 , Figure 2 and Figure 3A new energy motor flat wire stator hairpin wire cutting device includes a positioning guide assembly 100 and a composite die 200. The positioning guide assembly 100 has a cutter clamping block 110, a moving plate 120, and a fixed plate 130 arranged sequentially along the cutting direction of the cutting device. The moving plate 120 can slide relative to the fixed plate 130 along the cutting direction. A first elastic reset member 140 is installed between the cutter clamping block 110 and the moving plate 120. This first elastic reset member 140 continuously provides an elastic force that brings the moving plate 120 closer to the cutter clamping block 110, thereby assisting the components to quickly reset after the cutting action is completed.

[0023] The composite die 200 includes a cutting blade 210 and a base body, the base body including a guide seat 220 and a cutting blade seat 230. The lower end of the cutting blade 210 has a punch 211, on which a first cutting edge for cutting hairpin wire is machined. The cutting blade seat 230 is fixed to a fixed plate 130, and its interior has a die 231, on which a second cutting edge corresponding to the first cutting edge is correspondingly opened. The guide seat 220 is mounted on a movable plate 120, and its interior has a concave groove 221, along which the punch 211 can slide for precise guidance. When the cutting blade 210 is driven by the cutting blade clamping block 110, the punch 211 passes through the concave groove 221 of the guide seat 220 and engages with the die 231, causing the first and second cutting edges to form a shearing motion, thereby efficiently and smoothly cutting the hairpin wire placed therein.

[0024] In actual operation, the drive mechanism pushes the cutter clamping block 110 to perform a cutting action. The cutter clamping block 110 drives the punch 211 of the cutting blade 210 to move along the concave through groove 221 of the guide seat 220 towards the die 231. During the movement, the punch 211 gradually extends into the die 231 on the cutter seat 230, so that the first cutting edge and the second cutting edge intersect each other, achieving precise cutting of the hairpin wire. After cutting is completed, the drive mechanism retracts. Under the action of the first elastic reset member 140, the moving plate 120 and the connected guide seat 220 and cutting blade 210 are reset, and the punch 211 then exits the die 231, preparing for the next cutting operation. This device has a reasonable structure and precise guidance, which can effectively ensure the quality of the hairpin wire cutting surface and improve the production efficiency and product consistency of new energy motor stators. The sliding engagement of the moving plate 120 and the fixed plate 130 forms a preliminary positioning guide. Based on this, the engagement of the concave through groove 221 of the guide seat 220 and the punch 211, and the meshing between the punch 211 of the cutting blade 210 and the concave die 231 of the cutting blade holder 230, form a secondary positioning guide. This achieves precise positioning and motion guidance for the cutting device during operation, effectively ensuring the high precision requirements of the cutting process. Through the coordinated operation of the positioning guide component 100 and the composite die 200, along with the secondary guiding design, this device achieves high precision and high stability in the hairpin wire cutting process. Its elastic reset structure ensures rapid reset and continuity of the cutting action, effectively improving cutting efficiency and cut quality, while reducing the risk of burrs and deformation, thereby ensuring the reliability and consistency of new energy motor stator production.

[0025] Reference Figure 2 The fixed plate 130 is provided with four first guide posts 131, which are evenly distributed at the four fixed corners. The moving plate 120 is provided with four second guide posts 121, which are arranged one-to-one with the four first guide posts 131. The second guide posts 121 are provided with guide grooves, and the first guide posts 131 slide within the guide grooves. There is an interference fit between the first guide posts 131 and the guide grooves. The first guide posts 131 and the second guide posts provide initial guidance and reduce the offset of the cutting blade 210 during movement. It can be seen that the guide groove can be provided on the second guide post, which can achieve the same guiding effect. In some other embodiments, there can be two first guide posts 131, which are symmetrically arranged on the fixed plate 130. This embodiment does not limit the number of first guide posts 131. In some other embodiments, a sliding groove can be provided on the fixed plate 130, and a sliding block can be provided on the moving plate 120, so that the sliding block is slidably disposed on the sliding groove, realizing the sliding fit between the moving plate 120 and the fixed plate 130.

[0026] To ensure a tighter guiding fit, the fixed plate 130 is equipped with two positioning pins 132, and the cutter holder 230 is equipped with positioning holes that mate with the positioning pins 132. During installation, the positioning holes of the positioning holder are aligned with the positioning pins 132 to complete the positioning, and then the cutter holder 230 is fixed to the fixed plate 130 with fixing bolts. The positioning pins 132 can be cylindrical or other columnar shapes. The fixed plate 130 is also equipped with a chip removal channel 133, which corresponds to the concave die 231 of the cutter holder 230. Timely chip removal reduces the pressure of copper chips on the first and second cutting edges, preventing wear on the cutting edge surfaces and avoiding long-term accumulation of copper chips that could cause movement jamming and trajectory deviation, thus improving the accuracy and smoothness of the cutting process.

[0027] In this embodiment, the first elastic reset member 140 can be a spring, and there are two springs symmetrically distributed to evenly distribute the elastic force. The first elastic reset member 140 can also be a spring sheet or other components.

[0028] The cutter clamp 110 has a mounting groove 111, and the upper end of the cutter 210 is engaged in the mounting groove 111 to achieve a detachable connection, which facilitates the replacement of the cutter 210 or the grinding of the first cutting edge of the cutter 210. The mounting groove 111 is a dovetail groove. In some other embodiments, screws or other methods can also be used to achieve a detachable connection.

[0029] Existing cutting devices also suffer from the problem of copper wire wobbling during cutting, leading to an increased defect rate. Therefore, referring to... Figure 4 and Figure 5 This application further provides a wire pressing and loosening mechanism 240 in the cutter holder 230. The cutter holder 230 is provided with wire passage grooves 232 on both sides of the die 231. The wire pressing and loosening mechanism 240 includes a contouring pressure plate 241 and a second elastic reset member 242. The contouring pressure plate 241 is slidably disposed in the wire passage groove 232 along the shearing direction. The second elastic reset member 242 is connected to the cutter holder 230 and the guide seat 220 respectively, so that the contouring pressure plate 241 is away from the guide seat 220. When the cutting blade 210 presses against the cutter holder 230, the guide seat 220 presses against the cutter holder 230 accordingly, and the contouring pressure plate 241 presses against the hairpin wire, pressing the hairpin wire in the wire passage groove 232, reducing the sliding or displacement of the copper wire, and reducing the vibration amplitude during cutting. Meanwhile, the lower side of the contouring pressure plate 241 is wrapped with PVC transparent rubber, which can tighten the copper wire without damaging the surface due to excessive pressure. When the cutting blade 210 leaves the cutting blade seat 230, the contouring pressure plate 241 also leaves the wire groove 232, loosening the wire clamping. Due to the action of the second elastic reset member 242 and the first elastic reset member 140, the elastic force applied to the contouring pressure plate 241 will not disappear immediately, and the wire clamping will be loosened relatively slowly. That is, the wire cutting is completed. When the cutting blade 210 withdraws, it can continue to tighten the copper wire, effectively solving the wire clamping problem.

[0030] The contouring pressure plate 241 also features multiple linear clamping functions, and its shape can be flexibly designed according to the cross-section of the formed hairpin line, exhibiting high adaptability and compatibility. The second elastic reset element 242 is an elastic unit such as a spring or elastic sheet that can provide elastic force.

[0031] Furthermore, to improve stability during the pressing process and reduce displacement or vibration of the pressure plate under stress, the two ends of the telescopic positioning pin 243 are connected to the back of the contouring pressure plate 241 and the guide seat 220, respectively. When the cutter clamping block 110 drives the entire composite die 200 to move towards the hairpin line, the contouring pressure plate 241 applies a uniform pressing force on the surface of the hairpin line. At this time, the telescopic positioning pin 243 begins to retract under pressure, but its own structural characteristics provide the contouring pressure plate 241 with rigid support and precise positioning in the vertical direction, effectively suppressing the lateral swaying or tilting of the pressure plate.

[0032] As the cutting process proceeds, the punch 211 extends towards the die 231. During this time, the telescopic positioning pin 243 continuously provides a constant and stable elastic clamping force to the contouring pressure plate 241 using its second elastic reset element 242. This not only ensures that the hairpin wire is firmly constrained before being cut, eliminating the problem of poor cut caused by wire warping, but also maintains the rigidity of the system throughout the entire cutting process, allowing the first and second cutting edges to be precisely aligned for a clean and crisp cut. When the cutting action is completed and the components reset, the telescopic positioning pin 243 naturally extends under the action of elastic restoring force, pushing the contouring pressure plate 241 smoothly away from the workpiece surface, preparing for the next operation. This design significantly improves the stability and reliability of the device in high-speed continuous operation. The telescopic positioning pin 243 specifically includes a first sleeve and a second sleeve that are nested together. The first sleeve is fixedly connected to the contouring pressure plate 241, and the second sleeve is connected to the guide seat 220. The second elastic reset element 242 is a spring that is sleeved on the outer periphery of the first and second sleeves for better stability.

[0033] Existing cutting devices also suffer from poor equipment compatibility; processing hairpin wires of different sizes requires changing tooling molds of different sizes, thus failing to achieve flexible manufacturing. Therefore, referring to... Figure 6The cutter holder 230 assembly also includes a wire guide adjustment mechanism 250, used to adjust the limiting width and depth of the wire guide channel through which the hairpin thread passes, ensuring accurate positioning and reliable cutting of various thread types. The wire guide adjustment mechanism 250 includes a first limiting block 251, a second limiting block 252, a third limiting block 256, and an adjusting member. The first limiting block 251 and the second limiting block 252 are arranged parallel to each other, and the third limiting block 256 is located at the bottom between them, forming a wire guide channel for the hairpin thread to pass through. The adjusting member acts as the driving core; when operated, it can drive the first limiting block 251 and the second limiting block 252 to move away from or towards each other synchronously, thereby seamlessly changing the width of the wire guide channel; while adjusting the third limiting block 256 to move closer to or away from the first limiting block 251 can change the depth of the wire guide channel. This embodiment enables the cutter holder 230 to have a symmetrical adjustable slot width function, allowing the wire guide channel to be better aligned with the wire guide slot 232 of the cutter holder 230. It is applicable to the flexible cutting requirements of copper wires of various wire types, reducing the time required to change tooling molds or readjust due to changes in copper wire specifications. It can be used for small-batch trial production and mass production, effectively improving the versatility and flexibility of the equipment.

[0034] The adjusting components include a reversible screw 253, a knob 258, a locking screw 257, a screw seat 254, and a fixing sleeve 255. Specifically, the reversible screw 253 has a positive thread section and a negative thread section. The screw 253 passes through a first limiting block 251 and a second limiting block 252. The knob 258 is located at the end of the screw 253. The screw 253 passes through the screw seat 254 and the fixing sleeve 255, allowing it to rotate relative to the screw seat 254 and the fixing sleeve 255. The screw seat 254 is located on the cutter seat 230, and the screw seat 254 and the fixing sleeve 255 serve to position and fix the reversible screw 253. The first limiting block 251 engages with the positive thread section of the screw 253, while the second limiting block 252 engages with the negative thread section. When the knob 258 is rotated, due to the opposite thread direction, the two limit blocks will produce opposite linear movements along the axis of the forward and reverse screws 253. Rotating the screw clockwise or counterclockwise allows precise control over whether the two limit blocks move closer to each other to narrow the wire passage or move away from each other to widen the passage. The screw seat 254 has a limit groove, and the third limit block 256 slides in the limit groove to move away from or closer to the first limit block 251. The third limit block 256 serves as the bottom wall of the wire passage; adjusting the position of the third limit block 256 changes the depth of the wire passage. The locking screw 257 passes through the groove wall and abuts against the side of the third limit block 256. There are four locking screws 257, located on both sides of the third limit block 256, for a more secure fixation. The number of locking screws 257 is determined based on actual conditions and is not limited to four. To reduce external interference to the cable channel, the first limiting block 251 and the second limiting block 252 are covered with a cable channel cover plate 259. The cable channel cover plate 259 has two cable holes through which the cable channel passes.

[0035] The knob portion 258 is easy to adjust by hand without the need for other tools. The knob portion 258 includes two hand-tightening blocks that extend radially along the forward and reverse screw 253 and are located on both sides of the nut. In some other embodiments, the knob portion 258 can be an arc-shaped protrusion located on the edge of the forward and reverse screw 253, such as a star nut or a wing nut.

[0036] This design allows operators to quickly and accurately adjust the thread size without changing any parts to match different production needs, greatly improving the equipment's versatility and production efficiency, while ensuring that the hairpin thread is always in a state of optimal constraint before cutting.

[0037] In some other embodiments, the rack and pinion symmetrical drive mechanism drives the first limiting block 251 and the second limiting block 252 to move closer together or further apart. This mechanism has a drive gear positioned between two symmetrically arranged racks, with the first limiting block 251 and the second limiting block 252 fixedly connected to these two racks respectively. When the drive gear rotates in both directions, it simultaneously meshes and drives the two racks to move in opposite directions, thereby causing the two limiting blocks to move closer or further apart. This structure offers good motion synchronization and precise control.

[0038] In some other embodiments, the first limiting block 251 is relatively fixed, and the adjusting member drives the second limiting block 252 away from or closer to the first limiting block 251, which can also play the role of adjusting the width of the through-line channel.

[0039] Reference Figure 13 The cutting blade 210 features a chamfered structure, enabling trajectory constraint and posture calibration during the cutting process, ensuring a smooth and precise entry into the cutting blade holder 230. Both the cutting blade 210 and the cutting blade holder 230 contain chip removal grooves 212, located on the side of the cutting blade 210 near the die 231. This prevents copper chips from being pressed against the cutting edge of the punch 211 of the cutting blade 210 and the cutting edge of the die 231 of the cutting blade holder 230, thus avoiding surface wear and preventing long-term accumulation of copper chips that could cause movement jamming and trajectory deviation, thereby improving the accuracy and smoothness of the cutting process.

[0040] Reference Figures 7 to 16 An embodiment of the present invention provides a method for processing a composite die, used to process the composite die in the hairpin wire cutting device as described in any of the above claims, the method comprising: Step S100: Select a workpiece blank, the workpiece blank including a first blank for machining a cutting blade and a second blank for machining a base body; Step S200: Pre-process the workpiece blank; Step S300: Cut the first blank using a machining tool according to the first preset geometric center; Step S400: Cut the second blank using a machining tool according to the second preset geometric center. First, cut a concave channel on the basis of the second blank. The concave channel simultaneously forms a concave mold 231 and a concave through groove 221. Then, cut the second blank to separate the concave mold 231 and the concave through groove 221. At the same time, the second blank is divided into a guide seat 220 and a cutter seat 230.

[0041] In step S100, the same second blank is selected based on the characteristics of the guide seat 220 and the cutter seat 230, and the cutting blade 210 is a separate first blank. The blank size should be larger than the maximum boundary size of the part.

[0042] In step S200, the pretreatment of the workpiece blank includes blank squaring, pre-drilling wire holes, blank heat treatment, and blank grinding.

[0043] The blanks are squared. The first and second blanks are squared using a three-axis machining equipment to prepare for drilling, heat treatment and surface grinding. Pre-drill the wire threading hole using an EDM machine. Draw the maximum inscribed circle of the cutting tool 210 contour groove and the base die 231. The center of this circle is the optimal location for the pre-drilled hole, denoted as points A, A1, and A2, respectively. The diameters of the maximum inscribed circles are denoted as R1, R2, and R3, respectively. The diameter of the wire threading hole should be larger than the diameter of the electrode wire used for machining to ensure that the electrode wire can be smoothly inserted into the wire threading hole. At the same time, it should be as small as possible compared to the maximum inscribed circle, and far away from critical dimension surfaces or high-precision areas to prevent damage to these parts during the drilling process, which would affect the machining accuracy.

[0044] The blank is ground by using a precision surface grinder to square the cutting tool 210 and the second blank, ensuring that the flatness of each surface of the blank and the perpendicularity of adjacent surfaces meet the design requirements of the drawings, thus providing reliable conditions for accurate alignment in subsequent precision machining.

[0045] In steps S300 and S400, the machine tool is equipped with a probe head. In this embodiment, both the probe head and the cutting blade are slow wire EDM tools. Cutting the first blank using the machine tool according to the first preset geometric center includes obtaining the first preset geometric center, i.e., slow wire EDM alignment.

[0046] Obtaining the first preset geometric center O includes: controlling the probe head to contact and sense the edges of the four sides of the workpiece; selecting at least two equally divided measurement points on two opposite sides and recording the Y-axis coordinate value of each measurement point; selecting at least two equally divided measurement points on the other two opposite sides and recording the X-axis coordinate value of each measurement point, wherein the number of measurement points on each set of opposite sides is the same; calculating the average of all measured Y-axis coordinate values ​​as the Y-coordinate of the first preset geometric center of the workpiece in the top view; calculating the average of all measured X-axis coordinate values ​​as the X-coordinate of the second preset geometric center of the workpiece in the top view; and obtaining the second preset geometric center using the same method as obtaining the first preset geometric center.

[0047] Specifically, slow wire mesh alignment, making Figure 3 Top view of the 210 cutting tool Figure 7The blank surface S0 corresponds to blank surface S1 in the front view, S2 in the right view, S3 in the rear view, and S4 in the left view. Let center O be the geometric center of this surface. The X-axis is parallel to one side, the Y-axis lies on this plane and is perpendicular to the X-axis, and the Z-axis is perpendicular to the plane formed by the X and Y axes. The blank is positioned and locked using a fixture. The contact sensing function of the electrode wire is used to measure surfaces S1, S2, S3, and S4 respectively to obtain the actual boundary coordinates of the blank in the X and Y axis directions. For example... Figure 9 As shown, the electrode wire is moved to the lower edge of surface S1, triggering an edge-touching signal, and the coordinates of three quarter-division points P1(X1,Y1), P2(X2,Y2), and P3(X3,Y3) are recorded. The electrode wire is then moved to the upper edge of surface S3, triggering an edge-touching signal, and the coordinates of three quarter-division points P7(X7,Y7), P8(X8,Y8), and P9(X9,Y9) are recorded. Similarly, the electrode wire is moved to measure the coordinates of the lower edge of surface S2 P4(X4,Y4), P5(X5,Y5), and P6(X6,Y6) and the upper edge of surface S4 P4. 10 (X 10 ,Y 11 ), P 11 (X 11 ,Y 11 ), P 12 (X 12 ,Y 12) Based on the above data, calculate the positions of the two center lines C1 and C2 on plane S0. The coordinates of center line C1 are X0 = (X4 + X5 + X6 + X...). 10 +X 11 +X 12 ÷ 6, the coordinates of centerline C2 are Y0 = (Y1 + Y2 + Y3 + Y7 + Y8 + Y9) ÷ 6, and the intersection of the two centerlines is the coordinate position (X0, Y0) of the geometric center O in plane S0. Similarly, the second preset geometric center is obtained using the same method as the first preset geometric center, that is, the base alignment method is the same as that of the cutting blade 210, see details. Figure 8 , Figure 10 .

[0048] The cutting blade 210 and the base die 231 are machined using a slow wire EDM process. A suitable electrode wire is selected based on the structural characteristics, and the slow wire EDM trajectory diagram of the die 231 is drawn. The slow wire EDM trajectory diagram of the die 231 = original graphic - gap compensation distance. The gap compensation distance = electrode wire radius + discharge gap. The discharge gap is determined through multiple trial cuts on samples of the same material. The symmetry center I1 and geometric center O1 of the slow wire EDM trajectory diagram of the cutting blade 210's contour groove are aligned and set as the origin. Point A, the center of the largest inscribed circle of the wire threading hole on the left side, is the starting point for cutting the contour groove on the left side of the cutting blade 210. Cutting proceeds from the outside to the inside along the instantaneous direction. The cutting path is: AB-BC-CD-DE-EF-FB-BA.

[0049] Similarly, point A1, the center of the largest inscribed circle of the wire threading hole on the right, is the starting point for cutting the contour groove on the right side of the cutting blade 210. The cutting path is: A1B1-B1C1-C1D1-D1E1-E1F1-F1B1-B1A1.

[0050] Similarly, let the center of symmetry I2 and the geometric center O2 of the slow wire feed trajectory diagram of the base die 231 coincide and be set as the origin. The center A2 of the largest inscribed circle of the wire threading hole is the cutting starting point of the base die 231. The cutting path is: A2B2-B2C2-C2D2-D2E2-E2F2-F2G2-G2H2-H2I2-I2J2-J2K2-K2L2-L2M2-M2N2-N2B2-B2A2. The cutting endpoint and starting point coincide to ensure the smoothness of the cutting contour surface and avoid tool marks during secondary processing. A multi-cutting method of one main cut + six trimming cuts is used. After the main cut, the residual stress inside the workpiece is released. The six trimming cuts gradually improve the processing accuracy and surface finish. The above processing must ensure that the dimensional accuracy, flatness, perpendicularity, and roughness meet the design requirements of the drawings.

[0051] The cutting blade 210 and the remaining feature surfaces of the base are machined using a slow wire EDM process. The blank is re-fixed using a magnetic chuck, and the slow wire EDM path of the punch 211 is re-aligned and drawn. The punch 211 slow wire EDM path = original drawing + gap compensation distance. The gap compensation distance = electrode wire radius + discharge gap. The discharge gap is determined through multiple trial cuts on samples of the same material. First, the S1 surface of the cutting blade 210 is machined. The cutting paths for the grooves on both sides are A3B3, E3F3, and the cutting paths for the punch 211 and the chamfered surface are C3D3, G3H3, thus forming the grooves on both sides of the cutting blade 210, the punch 211, and the chamfered surface. Next, the S2 surface of the cutting blade 210 is machined. The cutting path for the chamfered surface is A4B4, C4D... 4， The chip removal groove 212 is cut along path E4F4, forming the chip removal groove 212 and the chamfered surfaces on both sides, thus completing the forming of the cutting blade 210. Similarly, for the guide seat 220 and the cutting blade holder 230, first, the S1 surface of the base is machined, cutting along the upper contour line of the cutting blade holder 230, with a cutting path of A5B5, achieving the basic forming of the cutting blade holder 230. Based on this, cutting is then performed along the lower contour line of the guide seat 220, with a cutting path of A6B... 6， The guide seat 220 is shaped. Next, the S2 surface of the base is machined using a cutting path of A7B7 to form the through groove 232, thus completing the basic shaping of the guide seat 220. The above machining process must ensure dimensional accuracy, flatness, perpendicularity, and roughness meet the design requirements of the drawings. The number of cuts and the cutting allowance are consistent with the method used for machining the cutting blade 210 contour groove and the base die 231 using slow wire EDM.

[0052] The characteristic holes of guide seat 220 and cutter seat 230 are machined by CNC. The pin holes and bolt holes of guide seat 220 and cutter seat 230 are machined sequentially to ensure that the dimensional accuracy and positional accuracy of the above-mentioned machining positions meet the design requirements of the drawings.

[0053] Step S400 also includes: The clearance between the punch 211 of the cutting blade 210 and the concave channel of the second blank is controlled to be within a preset range, which is 0.006~0.008 mm. While a zero-clearance design theoretically avoids burrs, in actual processing, machining or assembly errors can easily lead to interference contact, accelerating mold wear. This single-sided clearance design ensures that the punch and die edges simultaneously generate shearing force on the material, preventing excessive clearance from causing material tearing and edge deformation, resulting in burrs. It also ensures that the punch and die do not directly contact each other, significantly extending the mold's service life.

[0054] The new energy motor flat wire stator hairpin wire cutting device of the present invention involves the precise matching of composite die-cutting molds, requiring high precision in both external dimensions and positional accuracy. Therefore, a bidirectional alignment strategy is adopted to obtain the first and second preset geometric centers. With one side parallel to the machine tool coordinate axis, the machine tool's contact sensing function is used to detect the actual edge position of the blank, addressing potential dimensional or shape deviations in the blank. Alignment is performed on both sets of surfaces of the blank, and the center point where the two center lines intersect is the blank center. This center is the actual geometric center of the blank, not the ideal center on the drawing, thus eliminating the influence of blank machining tolerances on the reference point. Furthermore, the area to be processed is symmetrically distributed with this geometric center as the reference, and the relative position between the geometric center and the processing area remains fixed, thereby avoiding positional offsets caused by alignment based on theoretical dimensions. By limiting the influence of blank tolerances to the reference establishment stage, rather than transmitting them to the processing position, alignment errors caused by blank tolerances are effectively avoided, ensuring the relative positional accuracy between the processing area and the blank. Furthermore, based on the shared features of the guide seat 220 and the cutter seat 230, only one second blank is used to simultaneously machine the cavity mold 231 of the guide seat 220 and the cutter seat 230 on the same reference surface. Then, another reference surface is used to perform two cuts along the contour line to achieve the basic forming of the guide seat 220 and the cutter seat 230. Based on the integrated machining method of shared features, through the combination strategy of unified reference, synchronous machining and distributed fine finishing, the cumulative error caused by reference changes and blank differences in traditional split machining is eliminated, effectively ensuring its high precision requirements and realizing the precision machining of composite die molds.

[0055] Specific embodiments are as follows (length unit: mm): Assume that the maximum size of the cutting blade 210 is 60×20×20, the boundary size of the guide seat 220 is 120×30×17, the boundary size of the cutting blade seat (230) is 120×30×23, the boundary size accuracy is ±0.01, and the blank material is Cr12MoV.

[0056] In step S100, the blanks are cut. Based on empirical values, appropriate blank sizes are selected: the first blank is 65×25×25, and the second blank is 125×35×45.

[0057] In step S200, the blanks are squared. The first blank is squared to 62×22×22 using a three-axis machining equipment, and the second blank is squared to 122×32×42, with a 1mm allowance on each side.

[0058] Pre-drill the wire threading holes. Based on the pre-drilled wire threading holes shown above, calculate the maximum inscribed circle, with the centers marked as points A, A1, and A2. The diameters of the maximum inscribed circles are 3.6, 3.6, and 9.6 respectively. Therefore, a Φ1.5 hole is selected. To ensure processing efficiency, a 1.2mm electrode wire is selected, and each hole is rough-machined in one pass using an EDM (Electrical Discharge Machining) machine.

[0059] Heat treatment of the blanks. Two blanks are simultaneously quenched in a vacuum quenching furnace under the same parameters to achieve a hardness of 240-300 HB and a deformation of ≤0.02 mm. The vacuum-quenched blanks are then subjected to cold treatment to stabilize the material microstructure and reduce deformation. Finally, the blanks undergo aging treatment to release internal stresses and prevent a significant decrease in hardness.

[0060] Raw material grinding. Using a precision surface grinder, the surfaces of the raw material are ground in two rough grinding passes followed by four fine grinding passes to ensure that the first raw material has dimensions of 60×20×20 mm and the second raw material has dimensions of 120×30×41 mm. The flatness of each surface and the perpendicularity of adjacent surfaces are less than 0.005 mm, and the dimensional accuracy is ±0.01 mm.

[0061] In step S300, pre-drill wire holes and perform slow wire feeding for alignment. As described above, use a magnetic chuck to fix the blank, ensuring the first blank's S0 surface is horizontal and facing upwards. Measure the S1 surface with the electrode wire and record the corresponding coordinates as P1(95,90), P2(100,90), and P3(105,90). Measure the S2 surface with the electrode wire and record the corresponding coordinates as P4(110,95), P5(110,100), and P6(110,105). Measure the S3 surface with the electrode wire and record the corresponding coordinates as P7(105,110), P8(100,110), and P9(95,110). Measure the S4 surface with the electrode wire and record the corresponding coordinates as P... 10 (90,105), P 11 (90,100), P 12(90, 95). Calculate the coordinates of centerline C1: X0 = (110 + 110 + 110 + 90 + 90 + 90) ÷ 6 = 100, and the coordinates of centerline C2: Y0 = (90 + 90 + 90 + 110 + 110 + 110) ÷ 6 = 100. Therefore, determine the first preset geometric center O1 (100, 100) of the first blank.

[0062] In step S400, the coordinates of the second blank's S1, S2, S3, and S4 surfaces are measured using the same method as P1(90,60), P2(120,60), P3(150,60), P4(180,67.5), P5(180,75), P6(180,82.5), P7(150,90), P8(120,90), P9(90,90), P 10 (60, 82.5), P 11 (60,75), P 12 (60, 67.5). Calculate the coordinates of centerline C1: X0 = (180 + 180 + 180 + 60 + 60 + 60) ÷ 6 = 120, and the coordinates of centerline C2: Y0 = (60 + 60 + 60 + 90 + 90 + 90) ÷ 6 = 75. Therefore, determine the second preset geometric center O2 (120, 75) of the second blank.

[0063] The cutting tool 210 and the base die 231 are machined using a slow wire EDM process. Following the method described above, a 0.25mm galvanized copper wire is selected based on the structural characteristics. Multiple trial cuts verify that the single-sided discharge gap is 0.005mm. The gap compensation is calculated as 0.125 + 0.005 = 0.13mm. The slow wire EDM cutting trajectory diagram of the die 231 is then drawn based on the original diagram. The symmetry center I1 and geometric center O1 (100, 100) of the slow wire EDM trajectory diagram of the cutting tool 210's contour groove are aligned and set as the origin (0, 0). Point A (-5.64, 0) is the starting point for cutting the contour groove on the left side of the cutting tool 210, and the cutting path is AB-BC-CD-DE-EF-FB-BA. Similarly, point A1 (5.64, 0) is the starting point for cutting the contour groove on the right side of the cutting tool 210, and the cutting path is: A1B1-B1C1-C1D1-D1E1-E1F1-F1B1-B1A1. Similarly, the center of symmetry I2 and the geometric center O2 (120,75) of the slow wire EDM trajectory diagram of the base die 231 are superimposed and set as the origin (0,0). Point A2 (0,-5.23) is the cutting starting point of the base die 231. The cutting path is: A2B2-B2C2-C2D2-D2E2-E2F2-F2G2-G2H2-H2I2-I2J2-J2K2-K2L2-L2M2-M2N2-N2B2-B2A2.

[0064] In the above processing, the first main cut rough cuts a large amount of inner shape with a 0.2mm allowance, the first and second trimming cuts each semi-finished cut with a 0.06mm allowance, the third and fourth trimming cuts each fine cut with a 0.03mm allowance, and the subsequent two trimming cuts each fine cut with a 0.01mm allowance until the cutting is in place, and ensure that the dimensional accuracy is controlled within ±0.002mm, the flatness and perpendicularity are ≤0.002mm, and the surface roughness is ≤0.4mm.

[0065] The cutting tool 210 and the remaining feature surfaces of the base are machined using a slow wire EDM process. Following the method described above, the slow wire EDM cutting trajectory diagram of the punch 211 is drawn. First, with the first blank S1 surface horizontal and upward, the grooves on both sides are cut along paths A3B3 and E3F3. The punch 211 surface and the chamfered surface are then cut along paths C3D3 and G3H3. Next, with the first blank S2 surface horizontal and upward, the chamfered surface is cut along paths A4B4 and C4D4. The chip removal groove 212 is cut along path E4F4, achieving the basic forming of the cutting tool 210. Similarly, with the second blank S1 surface horizontal and upward, the outer shape is cut along the upper contour line of the cutter holder 230 along path A5B5, achieving the basic forming of the cutter holder 230. Based on the second blank S1 surface, the outer shape is cut along the lower contour line of the guide seat 220 along path A6B6. Then, with the second blank S2 surface horizontal and upward, the wire groove 232 is cut along path A7B7, achieving the basic forming of the guide seat 220. The number of cuts, cutting allowance, dimensional accuracy, flatness, perpendicularity, and roughness in the above processing steps are consistent with those in step seven.

[0066] The characteristic holes of guide seat 220 and cutter seat 230 are machined by CNC. The pin holes and bolt holes of guide seat 220 and cutter seat 230 are machined sequentially using a CNC machining center to ensure that the pin hole dimensional accuracy meets the H6 grade and the positional accuracy ≤ Φ0.01, and the bolt hole dimensional accuracy meets the H12 grade and the positional accuracy ≤ Φ0.2.

[0067] Post-processing of the die-cutting mold. Use sandpaper to smooth the burrs on the cutting blade 210, guide seat 220, and cutter holder 230, then use an oilstone for secondary polishing to ensure a smooth, burr-free surface. Next, use alcohol or acetone to clean the surface of dust, oil, and iron filings, then wipe it dry with industrial paper, and finally blow it dry with compressed air to ensure a clean surface free of dirt and impurities.

[0068] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0069] The embodiments of the present invention have been described in detail above with reference to the accompanying drawings. However, the present invention is not limited to the above embodiments. Within the scope of knowledge possessed by those skilled in the art, various changes can be made without departing from the spirit of the present invention.

Claims

1. A device for cutting flat wire stator hairpin wire in a new energy motor, characterized in that, include: The positioning guide assembly (100) includes a cutter clamping block (110), a moving plate (120), and a fixed plate (130) spaced apart along the cutting direction of the cutting device. The moving plate (120) is slidably disposed on the fixed plate (130) along the cutting direction of the cutting device. A first elastic reset member (140) is provided between the cutter clamping block (110) and the moving plate (120). The first elastic reset member (140) is used to provide a first elastic force for the moving plate (120) to approach the cutter clamping block (110). A composite die-cutting mold (200) includes a cutting blade (210) and a base body. The base body includes a guide seat (220) and a cutting blade seat (230). The cutting blade (210) has a punch (211) with a first cutting edge. The cutting blade seat (230) is located on a fixed plate (130) and has a die (231) with a second cutting edge. The guide seat (220) is located on a movable plate (120). The guide seat (220) is provided with a concave through groove (221) that slides with the punch (211). After the punch (211) passes through the concave through groove (221), it matches and engages with the die (231). The cutting blade (210) is provided on the cutting blade clamping block (110), so that the punch (211) can extend into or retract from the die (231) under the drive of the cutting blade clamping block (110), so that the second cutting edge and the first cutting edge cut each other to cut the hairpin wire located therein.

2. The new energy motor flat wire stator hairpin wire cutting device according to claim 1, characterized in that, The fixed plate (130) is provided with at least one first guide post (131), and the movable plate (120) is provided with at least one second guide post (121) that slides with the first guide post (131).

3. The new energy motor flat wire stator hairpin wire cutting device according to claim 1, characterized in that, The cutter holder (230) is provided with a wire pressing and loosening mechanism (240). The cutter holder (230) is provided with a wire passage groove (232). The wire pressing and loosening mechanism (240) includes a contouring pressure plate (241) and a second elastic reset member (242). The contouring pressure plate (241) is slidably disposed in the wire passage groove (232) along the shearing direction. The second elastic reset member (242) is disposed between the cutter holder (230) and the guide seat (220), so that the contouring pressure plate (241) is away from the guide seat (220).

4. The new energy motor flat wire stator hairpin wire cutting device according to claim 3, characterized in that, The second elastic reset member (242) includes a telescopic positioning pin (243), the two ends of which are connected to the contour plate (241) and the guide seat (220) respectively.

5. A new energy motor flat wire stator hairpin wire cutting device according to claim 1, characterized in that, The cutter holder (230) assembly is further provided with a wire guide adjustment mechanism (250), which includes a first limiting block (251), a second limiting block (252), a third limiting block (256), and an adjusting member. The first limiting block (251), the second limiting block (252), and the third limiting block (256) form a wire guide channel for the hairpin wire to pass through. The adjusting member is used to drive the first limiting block (251) and the second limiting block (252) to move away from or closer to each other, and to drive the third limiting block (256) to move closer to or away from the first limiting block (251).

6. A new energy motor flat wire stator hairpin wire cutting device according to claim 5, characterized in that, The adjusting component also includes a forward and reverse screw (253) and a knob (258). The first limiting block (251) and the second limiting block (252) are threadedly connected to the forward and reverse thread sections of the forward and reverse screw (253), respectively. The knob (258) is located at the end of the forward and reverse screw (253).

7. A new energy motor flat wire stator hairpin wire cutting device according to claim 1, characterized in that, The punch (211) is provided with a chip removal groove (212), which is located on the side of the cutter (210) near the die (231).

8. A method for processing composite die-cutting molds, characterized in that, The composite die is used to process the hairpin wire cutting device as described in any one of claims 1 to 7, and the method for processing the composite die includes: Select a workpiece blank, the workpiece blank including a first blank for machining a cutting blade and a second blank for machining a base body; Pre-process the workpiece blank; The first blank is cut by a machining tool according to the first preset geometric center; The second blank is cut by a machining tool according to the second preset geometric center. First, a concave channel is cut out on the basis of the second blank. The concave channel simultaneously forms a die (231) and a concave through groove (221). Then, the second blank is cut to separate the die (231) and the concave through groove (221). At the same time, the second blank is divided into a guide seat (220) and a cutter seat (230).

9. The composite die-cutting method according to claim 8, characterized in that, The process of cutting the second blank using a machining tool according to the second preset geometric center involves first cutting a concave channel on the second blank, which simultaneously forms a die (231) and a concave through groove (221). Then, the second blank is cut to separate the die (231) and the concave through groove (221), and the second blank is divided into a guide seat (220) and a cutter seat (230). This includes: The single-sided gap between the punch (211) of the control cutter (210) and the concave channel of the second blank is within a preset range, which is 0.006~0.008 mm.

10. The composite die-cutting method according to claim 8, characterized in that, in, The machine tool is equipped with a probe head, and the composite die-cutting method further includes: Obtaining the first preset geometric center and the second preset geometric center includes: The probe is controlled to contact and sense the edges of the four sides of the workpiece. At least two equally divided measurement points are selected on two opposite sides and the Y-axis coordinate value of each measurement point is recorded. At least two equally divided measurement points are selected on the other two opposite sides and the X-axis coordinate value of each measurement point is recorded. The number of measurement points on each pair of opposite sides is the same. The average value of all measured Y-axis coordinate values ​​is used as the Y-coordinate of the first preset geometric center of the workpiece in the top view. The average value of all measured X-axis coordinate values ​​is used as the X-coordinate of the second preset geometric center of the workpiece in the top view. The second preset geometric center is obtained using the same method as the first preset geometric center.

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