Laminated iron core production method, production equipment and laminated iron core

Abstract

The invention discloses a laminated iron core production method, production equipment and a laminated iron core. The laminated iron core production method comprises the following steps: obtaining a blanking layout and an initial cutting and welding path of an iron core material strip; identifying local strengthening sections distributed along the initial cutting and welding path based on the blanking layout; determining a geometric pattern of a path section corresponding to each local strengthening section so as to generate a target cutting and welding path; and according to the target cutting and welding path, iron core material strips to be connected are cut and welded. According to the method, cutting and welding stress distribution is optimized through local improvement of precision and intellectualization of the welding strength, so that the overall strength of a welding seam is effectively strengthened, stress concentration during blanking is dispersed, the failure problems of cracks, fractures and the like of the welding seam in the blanking process are avoided, and the structural stability of the connecting part of the iron core material belt is improved.

Description

Technical Field

[0001] This invention relates to the field of laminated iron core manufacturing technology, specifically to a method for producing laminated iron cores, production equipment, and laminated iron cores. Background Technology

[0002] As the core component of the motor stator and rotor, the performance of the motor core directly determines the motor's energy efficiency and operational stability. Motor cores are typically formed by stacking slabs of iron core material stamped from core strip. Since core strip is mostly supplied in coils, multiple coils must be connected end-to-end during production to ensure continuity and efficiency. However, if the weld seam appears within the effective area of ​​the final stamped slab, it will disrupt the consistency of its electromagnetic properties, leading to product defects. Therefore, controlling the weld seam location to prevent it from appearing on the finished product has become a key technical problem in this field.

[0003] Existing solutions involve designing special cutting paths to ensure that the weld seam avoids the stamping area of ​​the iron chip. For example, CN120155743A discloses a method and device for connecting motor lamination strips. This method detects the flatness defects (i.e., discarded areas) formed by curling at the beginning and end of the sheet metal and plans a broken line composed of several line segments connected end to end as a cutting path. This path runs through the width of the sheet metal, and each line segment passes through the midpoint of the stamping position of two adjacent laminations, thereby ensuring that the weld seam does not fall on the stamping position. This method effectively solves the weld positioning problem. However, in the design of high-density, miniaturized iron core layout, in order to maximize material utilization, the overlap or gap between the stamping positions of adjacent iron core sheets is often designed to be very small. Under such high-density layout, the pre-planned cutting and welding path needs to pass through or be adjacent to these extremely narrow areas. These areas are the most concentrated shear and tearing stresses during the instant of stamping, and are the weakest points with the highest risk of fracture failure. How to increase the welding strength of the iron core strip weld to avoid the weld fracture during stamping is an urgent problem to be solved.

[0004] Therefore, it is necessary to provide a new approach to solve the aforementioned technical problems. Summary of the Invention

[0005] In view of the shortcomings of the prior art, the purpose of this invention is to provide a method, equipment and material for producing laminated iron cores.

[0006] The technical solution of this invention is summarized as follows: The first objective of this invention is to provide a method for producing laminated iron cores, comprising the following steps in the cutting and welding process of the iron core strip: Obtain the punching layout and initial cutting and welding path of the iron core strip; Based on the blanking layout, local reinforcement segments distributed along the initial blanking and welding path are identified; Determine the geometry of the path segment corresponding to each of the aforementioned local reinforcement segments to generate the target welding path; According to the target cutting and welding path, the core strips to be connected are cut and welded.

[0007] Preferably, the step of identifying locally reinforced segments distributed along the initial welding path based on the punching layout includes: Based on the blanking layout, determine the breakage risk points on the initial cutting and welding path; Based on each of the aforementioned risk points of fracturing, weld reinforcement points are identified and marked on the initial weld path; The continuous path segment defined by adjacent weld reinforcement points is determined as the local reinforcement segment.

[0008] Preferably, the step of determining the breakage risk points on the initial welding path based on the punching layout includes: Obtain the minimum gap position between adjacent iron chip stamping positions on both sides of the initial cutting and welding path in the blanking layout; The vertical projection point of the minimum gap location on the initial welding path is determined as the breakage risk point.

[0009] Preferably, the step of identifying and marking weld reinforcement points on the initial weld path based on each of the aforementioned fragility risk points includes: Based on the risk points of easy breakage, identify path points that meet preset conditions along the initial cutting and welding path as welding reinforcement points. The preset conditions include: the distance between the weld reinforcement point and the corresponding easily broken risk point is greater than or equal to a first preset value, and the minimum gap between the weld reinforcement point and the contour of the adjacent iron chip stamping position is greater than or equal to a second preset value.

[0010] Preferably, the geometric pattern includes one or more of the following: wavy, sawtooth, and arc-shaped.

[0011] Preferably, it also includes the following steps: Based on the risk level of the fracture risk point corresponding to the local reinforced segment, a corresponding target geometry is matched for the local reinforced segment.

[0012] Preferably, it also includes the following steps: Obtain the thickness information of the iron core strip; The shape parameters of the geometry matching the local reinforcement segment are based on the thickness information.

[0013] Preferably, the steps of cutting and welding the core strips to be joined according to the target cutting and welding path include: During the welding process, the welding position is acquired in real time; When the welding position is located in the localized reinforced section, the laser welding process parameters are adjusted; wherein, the laser welding parameters include at least laser power and welding speed.

[0014] A second objective of the present invention is to provide a production equipment for laminated iron cores, for implementing the laminated iron core production method described above; wherein the production equipment for laminated iron cores includes at least an unwinding device, a cutting and welding device, and a stamping and forming device arranged sequentially.

[0015] A third object of the present invention is to provide a laminated iron core, which is manufactured by the laminated iron core production equipment described above.

[0016] Compared with the prior art, the beneficial effects of the present invention are as follows: This invention provides a method for producing laminated iron cores. In the cutting and welding process of the iron core strip, a local reinforcement section is added to the initial cutting and welding path, and then the geometric pattern of the local reinforcement section is matched to generate a target cutting and welding path. That is, the cutting and welding stress distribution is optimized by precisely and intelligently improving the welding strength locally, thereby effectively strengthening the overall strength of the weld, dispersing the stress concentration during punching, avoiding failure problems such as cracks and fractures in the weld during punching, and improving the structural stability of the iron core strip connection. Moreover, this embodiment can achieve weld strength enhancement by simply optimizing the cutting and welding path and parameters and applying local reinforcement measures on the basis of existing punching patterns and cutting and welding paths. The target cutting and welding path can be precisely adapted to the stamping layout of the punching pattern without occupying additional effective material area. This solves the problem of weak point fracture, ensures the material utilization rate of high-density patterns, reduces the loss of iron core strip, ensures the electromagnetic performance of the iron core, and improves production continuity and efficiency.

[0017] The above description is merely an overview of the technical solution of the present invention. In order to better understand the technical means of the present invention and to implement it according to the contents of the specification, the preferred embodiments of the present invention are described in detail below with reference to the accompanying drawings. Specific embodiments of the present invention are given in detail below with reference to the accompanying drawings. Attached Figure Description

[0018] The accompanying drawings, which are included to provide a further understanding of the invention and form part of this application, illustrate exemplary embodiments of the invention and, together with their description, serve to explain the invention and do not constitute an undue limitation thereof. In the drawings: Figure 1 This is a diagram showing the layout of the iron core strip and its welding path in Embodiment 1 of the present invention; Figure 2This is a flowchart of the cutting and welding control method for iron core strip in Embodiment 1 of the present invention; Figure 3 This is a flowchart of the process for identifying local reinforcement segments distributed along the initial welding path based on punching and layout in Embodiment 1 of the present invention; Figure 4a This is a flowchart illustrating the process of determining the breakage risk points on the initial welding path in Embodiment 1 of the present invention. Figure 4b This is a schematic diagram illustrating the determination of the fracture-prone risk point P in Embodiment 1 of the present invention; Figure 4c This is a schematic diagram of some candidate reinforcement points Pn on the initial welding path in Embodiment 1 of the present invention; Figure 4d This is a schematic diagram of a locally reinforced segment in Embodiment 1 of the present invention; Figure 5 This is a schematic diagram of the geometric pattern in Embodiment 1 of the present invention; Figure 6 This is a flowchart of the matching geometry of the local reinforcement segment in Embodiment 1 of the present invention; Figure 7 This is a flowchart of adjusting laser welding process parameters in Embodiment 1 of the present invention; Figure 8 This is a schematic diagram of the welding device in Embodiment 2 of the present invention.

[0019] In the diagram: 100, welding and cutting device; 10. Frame; 11. Workbench; 20. Clamping mechanism; 21. Support; 22. Drive cylinder; 23. Clamping block; 30. Cutting and welding mechanism; 31. Laser cutting head; 32. Laser welding head; 33. Motion module. Detailed Implementation

[0020] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of them. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0021] In the accompanying drawings, shapes and dimensions may be enlarged for clarity, and the same reference numerals will be used in all figures to indicate the same or similar parts.

[0022] In the following description, terms such as center, thickness, height, length, front, back, rear, left, right, top, bottom, upper, and lower are defined relative to the structure shown in the accompanying drawings. In particular, "height" corresponds to the dimension from top to bottom, "width" corresponds to the dimension from left to right, and "depth" corresponds to the dimension from front to back. These are relative concepts and may vary depending on their location and usage. Therefore, these or other orientations should not be interpreted as restrictive terms.

[0023] Terms involving attachment, connection, etc. (e.g., “connection” and “attachment”) refer to the relationship in which these structures are directly or indirectly fixed or attached to each other through an intermediate structure, as well as movable or rigid attachments or relationships, unless otherwise explicitly stated.

[0024] Example 1 This invention provides a method for producing a stacked iron core. The stacked iron core is formed by stacking multiple iron chips. The production of the stacked iron core mainly includes the following steps: conveying the iron core strip through the guide rollers of the unwinding device; the upper and lower die components of the stamping forming device cooperate to punch out iron chips in a predetermined shape on the iron core strip conveyed by the stepping method and then drop the chips into the blanks; and then rotating and stacking the chips in the blanking channel to form a stacked iron core. The iron core strip is supplied in rolls by the unwinding device. During the production process, multiple rolls of iron core strips need to be connected end to end to ensure the continuity and efficiency of production.

[0025] In this embodiment, during the cutting and welding process of the iron core strip, combined with Figure 1 , Figure 2 and Figure 4d As shown, it includes the following steps: S1. Obtain the punching layout of the iron core strip and the initial cutting and welding path L0; S2. Based on the blanking layout, identify the local reinforcement segments Ls distributed along the initial cutting and welding path L0; S3. Determine the geometric pattern of the path segment corresponding to each of the local reinforcement segments Ls to generate the target welding path L; S4. Cut and weld the iron core strips to be connected according to the target cutting and welding path L; combined with… Figure 1 and Figure 4dAs shown, the control welding device cuts the tail of the first iron core strip W1 and the head of the second iron core strip W2 according to the target welding path L, and then performs laser welding along the target welding path L to connect the first iron core strip W1 and the second iron core strip W2. The specific operation process can be as follows: the welding device first performs laser cutting along the target welding path L, and controls the cutting gap to ensure the butt joint accuracy of the two iron core strips; after cutting, the welding device performs laser welding along the same path, and the welding parameters (laser power, welding speed, defocusing amount) can be linked and adapted to the path shape type.

[0026] This implementation method adds a local reinforcement segment to the initial welding path and then generates a target welding path by matching the geometry of the local reinforcement segment. This optimizes the welding stress distribution through precise and intelligent local enhancement of welding strength, effectively strengthening the overall weld strength, dispersing stress concentration during punching, and preventing weld failures such as cracks and fractures during punching. This improves the structural stability of the core strip connection. Furthermore, this implementation method achieves weld strength enhancement simply by optimizing the welding path and parameters and applying local reinforcement measures to the existing punching layout and welding path. The target welding path can precisely adapt to the punching layout without occupying additional effective material area. This solves the problem of weak point fracture, ensures high-density layout material utilization, reduces core strip loss, ensures the electromagnetic performance of the core, and improves production continuity and efficiency.

[0027] In some embodiments, the step of setting the initial weld path includes: The trajectory of the cutting and soldering path is set in the non-stamping area between adjacent iron chip stamping positions to form the initial cutting and soldering path.

[0028] The initial welding path must be completely contained within the boundary of the non-stamping area, and must not intrude into any iron chip stamping position, so as to avoid the weld seam from damaging the functional area of ​​the iron chip and to ensure the integrity of the electromagnetic performance of the iron core.

[0029] In some alternative embodiments, the initial cutting and welding path setting can adopt the cutting path planning method in the invention patent with application number 202510638795.7.

[0030] In actual operation, the acquisition of blanking layout and the initial cutting and welding path positioning are as follows: After the operator selects the target product model on the control panel, the system automatically retrieves the standardized blanking layout corresponding to the model from the database. The layout pattern has predefined design parameters such as the stamping position, hole size, row spacing, column spacing and boundary coordinates of non-stamped areas of all iron chips on the iron core strip. Based on the coordinate data of the blanking layout, the system automatically plans the start and end points of the cutting and welding path and generates a path trajectory coordinate set. At the same time, the strip position can be calibrated in real time through a visual positioning module (such as a CCD camera) to compensate for the deviation error of the iron core strip and ensure the accuracy of path positioning.

[0031] In some embodiments, combined with Figure 3 As shown, step S2, identifying locally reinforced segments distributed along the initial welding path based on the punching layout, includes: S21. Determine the breakage risk points on the initial cutting and welding path based on the blanking layout; S22. Based on each of the aforementioned easily fractured risk points, identify and mark welding reinforcement points on the initial welding path; S23. The continuous path segment defined by adjacent weld reinforcement points is determined as the local reinforcement segment.

[0032] This embodiment identifies high-risk points for weld joint breakage caused by the geometric constraints of blanking layout, and can scientifically select safe operating areas on the path after fully considering the constraints of subsequent blanking processes and the feasibility of current welding processes, thereby implementing a precise and effective local reinforcement cutting and welding control method.

[0033] In some alternative embodiments, combined with Figures 4a-5 As shown, step S21, determining the breakage risk points on the initial cutting and welding path based on the punching layout, includes: S211. Obtain the minimum gap position between adjacent iron chip stamping positions on both sides of the initial cutting and welding path in the punching layout. S212. The vertical projection point of the minimum gap position on the initial welding path L0 is determined as the easily broken risk point P.

[0034] For example, based on the blanking layout, the position where the distance between the contours of adjacent iron chip stamping positions is minimized is identified, such as... Figure 4b The stamping positions A and B of the iron chip are the minimum gap G. Subsequently, the control system projects the minimum gap position vertically onto the initial cutting and welding path L0, and marks the projection point as the easy breakage risk point P, that is, point P is the position where the shear stress is most concentrated during the stamping.

[0035] In some alternative embodiments, step S22, identifying and marking weld reinforcement points on the initial weld path based on each of the said fracturing risk points, includes: Based on the fracture risk point P, identify path points that meet preset conditions along the initial welding path L0 as welding reinforcement points Ps. The preset conditions include: First condition: The distance between the weld strengthening point Ps and the corresponding fracture risk point P is greater than or equal to a first preset value; wherein, the setting of the first preset value ensures that there is a sufficient buffer distance between the local strengthening section and the fracture risk point P, so as to avoid the heat effect of the strengthening treatment directly acting on the fracture risk point. The second condition is that the minimum gap between the welding reinforcement point Ps and the outline of the adjacent iron chip stamping position is greater than or equal to the second preset value; wherein, the setting of the second preset value ensures that the local reinforcement segment is located in a region with sufficient space in the stamping layout, which is sufficient to accommodate the path deformation caused by the geometric feature reinforcement process.

[0036] For example, taking the fracture-prone risk point P as the center, a search is performed along the initial weld cutting path L0 to both sides to identify all candidate reinforcement points Pn on the initial weld cutting path L0 (such as...). Figure 4c (As shown in P1, P2, P3, P4...); for each candidate reinforcement point Pn on the path, perform the following judgment: Calculate the distance D along the initial weld cut-off path between the candidate reinforcement point Pn and the fracture risk point P; Calculate the minimum gap S between the initial trimming path L0 and the nearest iron chip stamping profile at the candidate reinforcement point Pn; A candidate strengthening point Pn is marked as a weld strengthening point Ps only if both of the following preset conditions are met: Preset condition 1 (safety distance condition): Distance D ≥ first preset value D1 (for example, it can be set to 20mm). This condition ensures that the weld reinforcement point and the easily fractured risk point are kept at a sufficient distance to avoid the superposition of weld heat-affected zones or mutual interference of stress fields.

[0037] Preset condition two (process space condition): minimum gap S ≥ second preset value S1 (e.g., can be set to 5.0mm). This condition ensures that there is sufficient physical space at the solder reinforcement point to implement subsequent geometric modification (such as forming a wavy or sawtooth shape) without interfering with the contour of the adjacent iron chip stamping position.

[0038] In some optional embodiments, step S23, determining the continuous path segment defined by adjacent weld strengthening points Ps as the local strengthening segment Ls, includes: Connect all the marked weld reinforcement points Ps in sequence, and the continuous path segments they cover ( Figure 4d The bolded portion is ultimately defined as the local enhancement segment Ls.

[0039] In some preferred embodiments, the geometric pattern includes one or more of wavy, sawtooth, and arc shapes; optionally, the non-linear pattern is a pattern containing a periodic undulating structure, for example... Figure 5 As shown, it may include Figure 5 (a) The serrated structure shown Figure 5 (b) shows the wavy / arc structure. Figure 5 (c) One or more of the square wave structures shown; that is, by applying the geometric pattern to the locally reinforced segment Ls that has been accurately identified in the aforementioned steps, the mechanical properties of the welded joint are actively enhanced.

[0040] In some alternative embodiments, the following steps are also included: Based on the risk level of the fracture risk point corresponding to the local reinforcement segment, a corresponding target geometry is matched for the local reinforcement segment; The risk level is determined based on the minimum gap value G at the fracture risk point P. The risk level is negatively correlated with the minimum gap value G at the fracture risk point P. The smaller the minimum gap value G is, the higher the risk level is.

[0041] In some alternative embodiments, the step of basing the risk level on the fracture risk point corresponding to the locally reinforced segment includes: The minimum gap value is matched with a preset gap threshold, wherein each preset gap threshold matches a different risk level; If the minimum gap value matches a preset gap threshold, the risk level corresponding to the preset gap threshold is obtained as the risk level of the easily breakable risk point.

[0042] For example, obtain the minimum gap value G at the fracture risk point P associated with the current local reinforced segment Ls, and set the first gap threshold G1=3mm and the second gap threshold G2=2mm.

[0043] Judgment rules: If G≥G1, then the risk level is determined to be Level 1 (low level).

[0044] If G2≤G<G1, then the risk level is determined to be Level 2 (Intermediate).

[0045] If G < G2, the risk level is determined to be Level 3 (High).

[0046] Style matching based on risk level: Based on the risk level determined above, the system invokes the corresponding geometric pattern matching rules: If the risk level is Level 1 (low level), the local reinforcement section is matched with a wavy or gentle arc shape; this geometry can provide a certain degree of stress dispersion while maintaining excellent welding process stability.

[0047] If the risk level is Level 2 (intermediate), the wave shape is matched to the local reinforcement segment, and its amplitude parameter can be appropriately increased to enhance the reinforcement effect.

[0048] If the risk level is Level 3 (high), it indicates that this is an extremely weak point; a sawtooth or square wave structure will be prioritized for matching the local reinforcement section; for example, the sharp corners of the sawtooth shape can provide the strongest resistance to crack propagation, which is an effective geometric means to achieve a strong risk and strong countermeasure strategy.

[0049] In some preferred embodiments, combined with Figure 6 As shown, the step of matching the target geometry pattern corresponding to the local enhancement segment further includes: S31. Obtain the thickness information of the iron core strip; S32. Based on the thickness information, the shape parameters of the geometric pattern matched to the local reinforcement segment.

[0050] Specifically, when the geometric pattern is a wave-shaped structure, the core geometric parameters include amplitude A and wavelength λ; when the geometric pattern is a sawtooth-shaped structure, the core geometric parameters include tooth height H and tooth pitch P; when the geometric pattern is an arc-shaped structure, the core geometric parameters can be expressed as radius of curvature R or arc height.

[0051] This embodiment takes silicon steel strip with a thickness range of 0.35mm to 0.5mm as an example.

[0052] For example, when a wavy structure has been selected as the geometry for a certain local reinforcement section, and the current thickness of the core strip is H=0.4mm.

[0053] For a wave-like shape, the key shape parameters are amplitude A and wavelength λ, which can be set as follows: Amplitude A = kH, where k is a proportionality coefficient (e.g., k = 4). When H = 0.4 mm, A = 1.6 mm is calculated.

[0054] Wavelength λ = mH, where m is another proportionality coefficient (e.g., m = 8). When H = 0.4 mm, λ = 3.2 mm is calculated.

[0055] The proportionality coefficients k and m are empirical constants determined based on theoretical analysis and process experiments, used to optimize fracture resistance and process stability, and are pre-stored in the control system.

[0056] In some embodiments, combined with Figure 7 As shown, S4, the step of cutting and welding the iron core strips to be connected according to the target cutting and welding path includes: S41. During the welding process, the welding position is acquired in real time; S42. When the welding position is located in the localized strengthening section, adjust the laser welding process parameters; wherein, the laser welding parameters include at least laser power and welding speed.

[0057] In this embodiment, the laser energy input density is at least higher for the locally enhanced section than for the non-enhanced section.

[0058] In some alternative implementations, the laser welding process parameters are determined based on the geometry matched to the locally reinforced segment. For example, when the geometry is a serrated structure, the laser welding process parameters are adjusted by using a higher instantaneous laser power or a lower welding speed at the tooth tip corners of the serrated structure compared to the straight sections of its tooth valleys.

[0059] Example 2 This invention also provides a production equipment for laminated iron cores, used to implement the laminated iron core production method as described in Embodiment 1; wherein the production equipment for laminated iron cores includes at least an unwinding device, a cutting and welding device 100, and a stamping and forming device arranged sequentially.

[0060] In some embodiments, combined with Figure 8 As shown, the welding and cutting device 100 includes: The frame 10, which serves as the supporting body for the welding and cutting device 100, has a horizontal worktable 11.

[0061] A clamping mechanism 20 is disposed on the frame 10 and is used to clamp the tail end of the first iron core strip and the head end of the second iron core strip respectively. Specifically, the clamping mechanism 20 is disposed on the worktable 11 and includes two clamping components, which correspond to the clamping positions of the tail end of the first iron core strip and the head end of the second iron core strip respectively. Each clamping component includes a bracket 21, a drive cylinder 22 and a pressure block 23. The drive cylinder 22 is vertically mounted on the bracket 21, and its piston rod extends upward and is connected to the pressure block 23 to drive the pressure block 23 to rise and fall, thereby clamping or releasing the strip located below it.

[0062] A cutting and welding mechanism 30 is disposed on the frame 10 and located above the clamping mechanism 20. The cutting and welding mechanism 30 includes a laser cutting head 31 and a laser welding head 32. Specifically, the cutting and welding mechanism 30 is mounted above the worktable 11 and the clamping mechanism 20 via a gantry-type motion module 33. The motion module 33 includes mutually orthogonal X-axis linear modules, Y-axis linear modules, and Z-axis linear modules, which can perform two-dimensional translation in the horizontal plane (XY plane) and vertical Z-axis lifting motion perpendicular to the horizontal plane. The cutting and welding mechanism 30 specifically includes a laser cutting head 31 and a laser welding head 32, which are fixedly installed side by side on the moving end of the Z-axis linear module. Driven by the motion module 33, the laser cutting head 31 and the laser welding head 32 can move precisely along a preset path as a whole, and the focusing position can be adjusted via the Z-axis.

[0063] The control unit is connected to the clamping mechanism 20 and the cutting and welding mechanism 30. Specifically, the control unit is electrically connected to the drive cylinder 22 of the clamping mechanism 20, the motion module 33 of the cutting and welding mechanism 30, and the laser, respectively. The control unit is used to obtain the punching and layout and the initial cutting and welding path, and after generating the corresponding target cutting and welding path instruction, it controls the clamping mechanism 20 and the cutting and welding mechanism 30 to work together to cut and weld the tail of the first iron core strip and the head of the second iron core strip.

[0064] The welding and cutting device 100 performs the following operations in sequence: The clamping mechanism 20 fixes the first iron core strip, and the laser cutting head 31 precisely cuts the tail of the first iron core strip along the planned path to form a cutting edge with a specific shape. The head of the second iron core strip is transported to the docking position, and the laser cutting head 31 cuts the head of the second iron core strip along the same planned path to form a matching cutting edge. The cutting edges of the two iron core strips are then precisely spliced ​​together. Subsequently, the laser welding head 32 is controlled to weld along the same path to firmly connect the two iron core strips into one. Since the welding path and the cutting path are completely overlapped and the entire process is located in the non-stamping area, it can be ensured that there are no weld marks on all the iron chips that are finally stamped.

[0065] In some optional embodiments, a plate thickness detection unit is further included, disposed on the frame 10 and connected to the control unit, for acquiring the plate thickness information of the core strip in real time. The plate thickness detection unit may employ a non-contact laser thickness gauge or a thickness sensor. Before or during the strip connection operation, the plate thickness detection unit performs real-time online thickness measurement on the tail end of the first core strip and / or the head end of the second core strip, and transmits the measured actual plate thickness information to the control unit. At this time, the control unit is configured to prioritize the real-time actual plate thickness information provided by the plate thickness detection unit as the basis for path shape type decision-making, ensuring accurate matching between path planning and the current physical characteristics of the strip. Compared to relying on preset plate thickness information, this further improves the accuracy of welding process adaptation and the reliability of joint quality.

[0066] In this embodiment, the operation process of the motor laminated iron core production equipment includes at least the following: Normal stamping stage: The first core strip is released by the unwinding device, smoothly conveyed by the guide roller conveyor, and directly enters the stamping forming device for continuous stamping production.

[0067] Material strip connection stage: When the first core strip is about to run out, the tension control mechanism of the unwinding device maintains the tension at the tail of the material, while the second core strip is ready. The main control system of the production line issues an instruction, and the cutting and welding device executes: the clamping mechanism first presses down on the tail of the first core strip; the cutting and welding mechanism plans and executes the cutting of the tail of the first core strip according to the plate thickness information of the two rolls; the head of the second core strip is conveyed to the docking station and clamped by the clamping mechanism for cutting; the two cut surfaces are joined together and laser welded.

[0068] Post-connection stamping stage: After connection, the clamping mechanism releases, and the now-connected iron core strip is smoothly fed into the stamping forming device. The feeding step distance of the stamping forming device must ensure that the weld seam between the first and second iron core strips always moves between each stamping station and never stops at any one station. Therefore, each stamped lamination comes from a complete base material and contains absolutely no weld seams.

[0069] This embodiment achieves fully automated and highly reliable connection between different coils, greatly improving equipment production efficiency; it ensures that all stacked sheets punched out by the stamping forming device are free of weld seams, eliminating the problem of inconsistent performance of motor stacked iron cores caused by weld seams at the source, and improving the overall quality and consistency of the product; the production equipment for motor stacked iron cores in this embodiment can flexibly handle the production tasks of iron core strips of different specifications and batches, enhancing the adaptability of the production line.

[0070] Example 3 This invention also provides a laminated iron core, which is manufactured using the production equipment for laminated iron cores as described in Embodiment 2. The laminated iron core is a stacked body formed by stamping and stacking, comprising multiple iron chips of the same shape.

[0071] In this embodiment, the welding device in the production equipment ensures that the weld is completely located in the non-stamping area, and the step distance of the stamping forming device is precisely coordinated with it, so that each individual iron chip formed after stamping is of complete and uniform material, and there are no welding marks or heat-affected zones inside or on the edges; thus eliminating the magnetic circuit inhomogeneity, increased iron loss or weak points in mechanical strength caused by the weld.

[0072] Although embodiments of the present invention have been disclosed above, they are not limited to the applications listed in the specification and embodiments. They can be applied to various fields suitable for the present invention. For those skilled in the art, other modifications can be easily made. Therefore, without departing from the general concept defined by the claims and their equivalents, the present invention is not limited to the specific details and illustrations shown and described herein.

Claims

1. A method for producing a laminated iron core, characterized in that, The cutting and welding process of iron core strip includes the following steps: Obtain the punching layout and initial cutting and welding path of the iron core strip; Based on the blanking layout, local reinforcement segments distributed along the initial blanking and welding path are identified; Determine the geometry of the path segment corresponding to each of the aforementioned local reinforcement segments to generate the target welding path; According to the target cutting and welding path, the core strips to be connected are cut and welded.

2. The method for producing laminated iron cores as described in claim 1, characterized in that, The step of identifying locally reinforced segments distributed along the initial welding path based on the punching layout includes: Based on the blanking layout, determine the breakage risk points on the initial cutting and welding path; Based on each of the aforementioned risk points of fracturing, weld reinforcement points are identified and marked on the initial weld path; The continuous path segment defined by adjacent weld reinforcement points is determined as the local reinforcement segment.

3. The method for producing laminated iron cores as described in claim 2, characterized in that, The steps for determining the breakage risk points on the initial welding path based on the blanking layout include: Obtain the minimum gap position between adjacent iron chip stamping positions on both sides of the initial cutting and welding path in the blanking layout; The vertical projection point of the minimum gap location on the initial welding path is determined as the breakage risk point.

4. The method for producing laminated iron cores as described in claim 2, characterized in that, Based on each of the aforementioned vulnerable fracture risk points, the step of identifying and marking weld reinforcement points on the initial weld path includes: Based on the risk points of easy breakage, identify path points that meet preset conditions along the initial cutting and welding path as welding reinforcement points. The preset conditions include: the distance between the weld reinforcement point and the corresponding easily broken risk point is greater than or equal to a first preset value, and the minimum gap between the weld reinforcement point and the contour of the adjacent iron chip stamping position is greater than or equal to a second preset value.

5. The method for producing laminated iron cores as described in claim 1, characterized in that: The geometric patterns include one or more of the following: wavy, sawtooth, and arc.

6. The method for producing laminated iron cores as described in claim 5, characterized in that, It also includes the following steps: Based on the risk level of the fracture risk point corresponding to the local reinforced segment, a corresponding target geometry is matched for the local reinforced segment.

7. The method for producing laminated iron cores as described in claim 1, characterized in that, It also includes the following steps: Obtain the thickness information of the iron core strip; The shape parameters of the geometry matching the local reinforcement segment are based on the thickness information.

8. The method for producing laminated iron cores as described in claim 1, characterized in that, The steps of cutting and welding the iron core strips to be connected according to the target cutting and welding path include: During the welding process, the welding position is acquired in real time; When the welding position is located in the locally reinforced section, adjust the laser welding process parameters.

9. A production equipment for laminated iron cores, characterized in that, The method for producing a laminated iron core as described in any one of claims 1-8 is used; wherein the equipment for producing the laminated iron core includes at least an unwinding device, a cutting and welding device, and a stamping and forming device arranged in sequence.

10. A laminated iron core, characterized in that, The laminated iron core is manufactured using the laminated iron core production equipment as described in claim 9.

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