Cutting and welding control method of iron core material strip, cutting and welding device, production equipment and motor iron core

Abstract

The invention discloses a cutting and welding control method and device for an iron core material strip, production equipment and a motor iron core. The cutting and welding control method comprises the following steps that blanking information of the current to-be-connected iron core material strip is obtained; wherein the blanking information at least comprises the thickness of the iron core material belt and a layout pattern; determining a cutting and welding track according to the layout pattern of the iron core material strip; determining a nonlinear pattern configured in the cutting and welding track according to the thickness of the iron core material strip; the cutting and welding track is configured according to the nonlinear style so as to form a cutting and welding path; and cutting and welding the to-be-connected iron core material strip according to the cutting and welding path. According to the invention, by establishing the association between the plate thickness and the cutting and welding path, the strip splicing process of iron core material strips with different thicknesses is quickly adapted, and the reduction of the connection reliability caused by the change of the plate thickness is avoided.

Description

Technical Field

[0001] This invention relates to the field of laminated iron core manufacturing technology, specifically to a method for controlling the cutting and welding of iron core strips, a cutting and welding device, production equipment, and an electric motor iron core. 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 the weld seam avoids the stamping area of ​​the ferrite chip. For example, CN120155743A discloses a method and equipment for connecting motor lamination strips. This method detects areas of unsatisfactory flatness (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 the cutting path. This path runs through the width of the sheet metal, with each line segment passing through the midpoint of the stamping position of two adjacent laminations, thus ensuring the weld seam does not fall on the stamping position. This method effectively solves the weld seam positioning problem. However, in actual continuous production, especially when facing the production needs of different batches and thicknesses of ferrite chips, the mechanical reliability (i.e., welding strength, welding quality, etc.) of the welded joint may fluctuate. How to actively optimize the performance of the welded joint based on the strip thickness 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 for controlling the cutting and welding of iron core strip, a cutting and welding device, production equipment and an electric motor iron core.

[0006] The technical solution of this invention is summarized as follows: The first objective of this invention is to provide a method for controlling the cutting and welding of iron core strip, comprising the following steps: Obtain the punching information of the core strip to be connected; wherein, the punching information includes at least the thickness and layout pattern of the core strip; The cutting and welding trajectory is determined based on the layout pattern of the iron core strip; The non-linear pattern configured in the cutting and welding trajectory is determined based on the thickness of the core strip; Configure the cutting and welding trajectory according to the non-linear pattern to form a cutting and welding path; According to the cutting and welding path, the iron core strips to be connected are cut and welded.

[0007] Preferably, the non-linear style includes at least one of a zigzag structure, a wavy structure, or an arc structure.

[0008] Preferably, before determining the non-linear pattern configured in the cutting and welding trajectory based on the thickness of the core strip, the method further includes the following steps: The thickness of the core strip is used to determine whether the cutting and welding trajectory is configured with a non-linear style.

[0009] Preferably, the steps include: The thickness of the iron core strip is compared with a preset thickness threshold. If the thickness is greater than or equal to a preset thickness threshold, it is determined that the cutting and welding trajectory is configured as a non-linear pattern. If the thickness is less than the preset thickness threshold, it is determined that the cutting and welding trajectory is configured as a straight line.

[0010] Preferably, the step of determining the non-linear pattern configured in the cutting and welding trajectory based on the thickness of the core strip includes: The thickness range is determined based on the thickness of the core strip. If the thickness is within the first thickness range, then the non-linear style is selected as a wavy structure; If the thickness is located in a second thickness range that is greater than the first thickness range, then the non-linear style is selected as a sawtooth structure.

[0011] Preferably, the step of configuring the cutting and welding trajectory according to the non-linear pattern includes: Based on the thickness of the core strip and the layout pattern, the geometric parameters of the cutting and welding trajectory are matched.

[0012] Preferably, the method further includes the step of: adjusting the laser welding parameters of the cutting and welding device; wherein the laser welding parameters include at least laser power and welding speed.

[0013] Preferably, it also includes the following steps: Based on the thickness and material of the iron core strip, the basic energy parameters for laser welding are set; Based on the cutting and welding path, the basic energy parameters are compensated and adjusted.

[0014] A second objective of this invention is to provide a cutting and welding apparatus for iron core strips, used to implement the cutting and welding control method for iron core strips as described above, comprising: frame; A clamping mechanism is provided on the frame to clamp the tail of the first iron core strip and the head of the second iron core strip respectively; A cutting and welding mechanism is disposed on the frame and located above the clamping mechanism; the cutting and welding mechanism includes a laser cutting head and a laser welding head; A control unit, which is connected to the clamping mechanism and the welding mechanism; The control unit is used to obtain the punching information of the iron core strip and generate the corresponding cutting and welding path instructions. Then, it controls the clamping mechanism and the cutting and welding mechanism to work together to cut and weld the tail of the first iron core strip and the head of the second iron core strip.

[0015] Preferably, it further includes: a plate thickness detection unit, which is disposed on the frame and connected to the control unit, for acquiring plate thickness information of the iron core strip in real time.

[0016] A third objective of this invention is to provide a production equipment for motor cores, comprising an unwinding device, a cutting and welding device for the core strip as described above, and a stamping and forming device arranged in sequence.

[0017] A fourth objective of the present invention is to provide a motor core manufactured using the motor core manufacturing equipment described above.

[0018] Compared with the prior art, the beneficial effects of the present invention are as follows: This invention provides a method for controlling the cutting and welding of iron core strips. By determining the shape of the cutting and welding path based on the thickness of the iron core strip, the optimal path shape can be adaptively customized for iron core strips of different thicknesses. This fundamentally solves industry problems such as insufficient welding strength or thin plate deformation caused by differences in plate thickness. Through active adaptation of the path shape, not only are the mechanical properties and reliability of the welding area guaranteed, but the same production line can also seamlessly adapt to diverse production tasks. Specifically, when the production line switches to iron core strips of different thicknesses, the system can automatically identify the changes and adjust process parameters in real time, significantly improving process flexibility, quality consistency, and overall production efficiency. Simultaneously, by precisely setting the trajectory of the cutting and welding path outside the stamping area of ​​the iron core chip, while achieving the above performance optimization, any impact of the weld on the functional areas of the iron core chip is completely avoided, thus ensuring the electromagnetic integrity and manufacturing quality of the final product from the source.

[0019] 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 in the following embodiments and their accompanying drawings. Attached Figure Description

[0020] 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 layout diagram of the cutting and welding path in Embodiment 1 of the present invention; Figure 2 This 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 illustrating the process of determining whether a cutting and welding trajectory is configured with a non-linear style in Embodiment 1 of the present invention. Figure 4 This is a schematic diagram of a non-linear pattern in Embodiment 1 of the present invention; Figure 5 This is a flowchart illustrating the determination of the non-linear pattern configured in the cutting and welding trajectory in Embodiment 1 of the present invention; Figure 6 This is a flowchart illustrating the adjustment of laser welding parameters in the cutting and welding device according to Embodiment 1 of the present invention; Figure 7 This is a schematic diagram of the welding device in Embodiment 2 of the present invention.

[0021] 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

[0022] 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.

[0023] 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.

[0024] 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.

[0025] 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.

[0026] Example 1 Since the thickness of the iron core strip is a key parameter determining its welding heat input, molten pool behavior, residual stress, and joint mechanical properties, the ideal weld morphology (such as penetration depth and width-to-length ratio) should differ for strips of different thicknesses. However, existing methods use similar cutting paths for all strip thicknesses, failing to establish a correlation between the shape of the cutting and welding path and the thickness of the iron core strip, thus making it impossible to actively optimize the mechanical properties of the weld for different thicknesses. Therefore, this invention provides a method for controlling the cutting and welding of iron core strips, combined with... Figure 1 and Figure 2 As shown, it includes the following steps: S1. Obtain the punching information of the core strip to be connected; wherein, the punching information includes at least the thickness and layout pattern of the core strip; wherein, the thickness is obtained in ways including but not limited to the following two: Manual input mode: Based on the material quality certificate of the iron core strip, the operator inputs the product model of the current production batch through the human-machine interface of the production control system, and the system retrieves the standard plate thickness parameters corresponding to the model from the preset database.

[0027] Online inspection mode: An online material thickness measurement device (such as a laser thickness gauge or a contact thickness sensor) is configured at the front end of the cutting and welding station to obtain the thickness data of the current iron core strip more accurately; for example, multiple points (at least 3 evenly distributed points) at the tail of the first iron core strip W1 and the head of the second iron core strip W2 can be measured and the average value is taken as the final thickness data.

[0028] S2. Determine the cutting and welding trajectory based on the layout pattern of the core strip; wherein the cutting and welding trajectory is set within the non-stamping area between adjacent iron chip stamping positions; specifically, the entire cutting and welding trajectory must be completely contained within the boundary of the non-stamping area, without intruding into any iron chip stamping position, to avoid damage to the functional area of ​​the iron chip by the weld and to ensure the integrity of the electromagnetic performance of the core. In some optional embodiments, the layout pattern is obtained and the path is located as follows: when the operator selects the target product model on the control panel, the system automatically retrieves the standardized layout pattern corresponding to the model from the database. This pattern has predefined design parameters such as the stamping position, aperture size, row spacing, column spacing, and boundary coordinates of the non-stamping area of ​​all iron chips on the core strip; based on the coordinate data of the layout pattern, the system automatically plans the start and end points of the cutting and welding path and generates a path trajectory coordinate set; in some preferred embodiments, the strip position can also be calibrated in real time by a visual positioning module (such as a CCD camera) to compensate for the deviation error of the core strip and ensure the accuracy of path positioning.

[0029] S3. Determine the non-linear pattern configured in the cutting and welding trajectory based on the thickness of the core strip; wherein different thicknesses are associated with different shape patterns; in some optional embodiments, the non-linear pattern is a pattern containing a periodic undulating structure, for example... Figure 4 As shown, it may include Figure 4 (a) shows the wavy / arc structure. Figure 4 One or more of the square wave structure shown in (b) and the sawtooth structure shown in (c).

[0030] S4. Configure the cutting and welding trajectory according to the non-linear pattern to form the cutting and welding path G; S5. Perform cutting and welding on the iron core strips to be connected according to the cutting and welding path; combined with Figure 1 As 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 cutting and welding path G, and then performs laser welding along the cutting and welding path G 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 cutting and welding path G, 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.

[0031] This embodiment establishes a correlation between plate thickness and the cutting and welding path, enabling rapid adaptation of the splicing process for core strips of different thicknesses, thus avoiding a decrease in connection reliability due to changes in plate thickness. Specifically, the shape of the cutting and welding path is determined by the thickness of the core strip, allowing for adaptive customization of the optimal path shape for core strips of different thicknesses. This fundamentally solves industry problems such as insufficient welding strength or thin plate deformation caused by differences in plate thickness. For example, for thick strips, a path shape with higher tortuosity can be matched to increase the weld length and bonding area to compensate for or optimize the connection strength between core strips of different plate thicknesses, thereby ensuring the load-bearing strength of the welding area. For thin strips, a smooth path shape can be used to reduce heat input density and effectively control welding deformation. Through the active adaptation of the path shape, not only are the mechanical properties and reliability of the welding area itself guaranteed, but the same production line can also seamlessly adapt to diverse production tasks. That is, when the production line switches to core strips of different thicknesses, the system can automatically identify the changes and adjust the process parameters in real time, significantly improving process flexibility, quality consistency, and overall production efficiency. Meanwhile, by precisely setting the cutting and welding path outside the stamping area of ​​the iron chip, the above-mentioned performance optimization is achieved while completely avoiding any impact of the weld seam on the functional area of ​​the iron chip, thus ensuring the electromagnetic performance integrity and manufacturing quality of the final product from the source.

[0032] In some alternative implementations, step S1 is initiated when the first roll of tape is detected to be running out and a second roll of new tape needs to be connected. In specific application scenarios, the initiation timing can be set as follows: when the tape detection sensor on the production line detects that the remaining length of the first roll of tape is less than or equal to a preset value (e.g., 5m), the system automatically initiates step S1 to achieve continuous connection of the two rolls of tape, avoiding production line downtime and improving production efficiency.

[0033] In some alternative embodiments, the step of determining the cutting and welding trajectory based on the layout pattern of the core strip includes: Multiple bridging regions between adjacent iron chip stamping positions in the layout pattern are obtained; wherein, the multiple bridging regions constitute the non-stamping region; A corresponding local path segment is generated within each bridging area, and the path segment is kept at a safe distance from the edge of the iron core stamping position. The safe distance can be set according to the width of the heat-affected zone of laser welding, the allowable tolerance of the stamping die, the width error of the iron core strip itself, or empirical values. The path segments generated in adjacent bridging areas are smoothly connected to form a continuous path that runs through the width of the strip, which serves as the cutting and welding trajectory.

[0034] In some preferred embodiments, before step S3, which determines the non-linear pattern configured in the cutting and welding trajectory based on the thickness of the core strip, the method further includes the following step: Determine whether to configure a non-linear pattern for the cutting and welding trajectory based on the thickness of the iron core strip.

[0035] Further, in combination with Figure 3 as shown, the specific steps include: S301. Compare the thickness T of the iron core strip with a preset thickness threshold T0; wherein, the preset thickness threshold T0 is a critical value determined based on a large number of process tests and mechanical analyses, and is used to distinguish thick plates prone to punching fractures from thin plates that can be welded using conventional methods; for example, for commonly used non-oriented silicon steel materials, the preset thickness threshold can be set to 0.35 mm.

[0036] S302. Determine whether the thickness T is greater than or equal to the preset thickness threshold T0; S303. If the thickness T is greater than or equal to the preset thickness threshold T0, then determine to configure a non-linear pattern for the cutting and welding trajectory; specifically, when T≥T0, the current iron core strip is determined to be a thick plate, and its welded joints have a high risk of fracture during subsequent punching. Therefore, a non-linear pattern needs to be configured for the cutting and welding trajectory to disperse stress through the optimization of the path shape.

[0037] S304. If the thickness T is less than the preset thickness threshold T0, then determine to configure a linear pattern for the cutting and welding trajectory; specifically, when T<T0, the current strip is determined to be a thin plate, and its welded joints already have sufficient shear resistance without additional path optimization; therefore, the system will configure a linear pattern for the cutting and welding trajectory,沿用 the efficient and fast traditional linear welding scheme.

[0038] This embodiment only enables a more complex non-linear welding path when necessary, maintaining the high production efficiency to the greatest extent while ensuring the connection reliability of thick plates, and achieving the optimal balance between quality and cost.

[0039] In some embodiments, the steps of determining the non-linear pattern configured in the cutting and welding trajectory according to the thickness of the iron core strip include: Determine the geometric tortuosity of the cutting and welding trajectory in the plane of the iron core strip according to the thickness of the iron core strip; wherein, the geometric tortuosity is used to represent the complexity of the cutting and welding trajectory in a two-dimensional plane, and can be characterized by one or more indicators such as the total path length, the curvature change rate, and the number of inflection points per unit length. In some optional embodiments, geometric tortuosity = (actual path length - straight-line distance between the two endpoints of the path) / straight-line distance between the two endpoints of the path × 100%; the higher the path tortuosity, the larger the effective bonding area of the weld seam, and the more dispersed the heat input distribution.

[0040] In some other embodiments, in combination with Figure 5As shown, step S3, determining the non-linear pattern configured in the cutting and welding trajectory based on the thickness of the iron core strip, includes the following specific steps: The thickness range is determined based on the thickness of the core strip. Match the corresponding target style based on the thickness range to which the thickness belongs; The thickness range is set based on the welding characteristics of commonly used materials for core strips (such as silicon steel) and calibration using engineering practice data.

[0041] The specific steps include: S311. Determine the thickness range based on the thickness of the core strip; S312. Determine whether the thickness T is located within the first thickness range; S313. If so, select a non-linear style as a wavy structure or an arc structure. For example, when 0.35mm≤T<0.45mm, this range represents a medium strengthening requirement. The wavy structure has a continuous and smooth curve, uniform stress distribution, stable molten pool flow during welding, and beautiful weld formation. It provides good tear resistance while offering the best process stability. The arc structure can be regarded as a long-wavelength wavy structure, which is suitable for scenarios where the butt joint is long and a smooth transition is required. S314. If not, determine whether the thickness T is located in the second thickness range; wherein the second thickness range is greater than the first thickness range. S315. If so, choose a non-linear style as a sawtooth or wavy structure. For example, when T≥0.45mm, the core strip is thicker in this range, the punching stress is greater, and stronger tear resistance and more significant crack deflection effect are required. The sharp corners of the sawtooth structure can most effectively mechanically lock crack propagation and provide the strongest tear resistance. The large-amplitude wavy structure can balance performance and process stability. S316. If not, then it is determined that the basic structure style of the cutting and welding trajectory is configured, that is, the straight line style of the cutting and welding trajectory is configured.

[0042] In some preferred embodiments, the step of configuring the cutting and welding trajectory according to the non-linear pattern includes: Based on the thickness of the core strip and the layout pattern, match the geometric parameters of the non-linear pattern; It should be noted that the geometric parameters are specifically defined depending on the selected non-linear style: When the non-linear pattern is a wavy structure, the core geometric parameters include amplitude A and wavelength λ; When the non-linear style is a sawtooth structure, the core geometric parameters include tooth height H and tooth pitch P; When the non-linear style is an arc structure, the core geometric parameter can be represented as the radius of curvature R or the arc height.

[0043] For example, this embodiment can automatically calculate the optimal geometric parameter values ​​based on the real-time acquired strip thickness value by querying the database or calling the fitting formula. Then, according to the direction of the punching line and the location of the high-stress area, the direction of the cutting and welding trajectory, the local density, or the parameters of special sections are adjusted to form the final cutting and welding path.

[0044] This embodiment takes silicon steel strip with a thickness range of 0.35mm to 0.5mm as an example.

[0045] For example, the thickness of the silicon steel core strip is 0.4 mm. The system has determined that a wavy structure is required as a non-linear pattern based on the thickness range.

[0046] Combination Figure 4 The sine wave curve shown in (a) increases the actual scanning trajectory length within the same projection length compared to a straight path. This significantly increases the area of ​​the laser thermal zone and the weld volume during welding, thereby improving the shear area and mechanical strength of the welded joint to match the higher structural load-bearing requirements of the thick strip.

[0047] Among them, the main geometric parameters (amplitude and wavelength) of the sine wave curve are dynamically adjusted according to the thickness of the strip and the local risks revealed by the blanking pattern; that is, the degree of reinforcement of the local geometric parameters should be positively correlated with the estimated blanking fracture risk in that area.

[0048] Combination Figure 1 As shown, in the cutting and welding trajectory, which includes high-risk section A, transition section B, and ordinary section C, the system matches the basic geometric parameters of the sine wave curve from the parameter library based on the thickness T=0.4mm: amplitude A0=0.08mm, wavelength λ0=1.2mm.

[0049] For high-risk section A: due to the extremely small distance between the stamping position of the iron chip, the shear stress will be highly concentrated on the weld line, resulting in the highest risk of fracture; therefore, in order to maximize the effect of stress dispersion, the waveform can be enhanced in this section, for example: adjust the amplitude A1=0.12mm (about 1.5 times the base value) and the wavelength λ1=1.0mm (slightly shorter than the base value to increase the tear resistance period per unit length).

[0050] For transition section B: the cutting and welding trajectory needs to bypass the iron chip stamping position. The cutting and welding trajectory itself is curved here, and the stress state is complex. The primary goal is to ensure that the welding path can smoothly fit the basic trajectory to avoid unstable welding head movement or uncontrolled molten pool due to excessive waveform fluctuations. Therefore, priority is given to ensuring the trackability and process stability of the path. For example, the amplitude A2 is adjusted to 0.04mm (less than the basic value), and the wavelength λ2 is adjusted to 1.5mm (longer to make the waveform smoother) so that the wave shape approximately fits the original curved trajectory.

[0051] For ordinary section C: Since it is located in a wide edge scrap area and the distance from the punching line of the iron chip stamping position is large, the basic parameters that match the thickness can be directly adopted, namely amplitude A3=0.08mm and wavelength λ3=1.2mm.

[0052] The three sets of parameters are seamlessly connected to generate a wave-shaped welding path with continuously changing geometric parameters, which is the cutting welding path; the cutting welding device is controlled to perform welding according to this dynamic path and smoothly transition at the junction of each section.

[0053] To further improve welding quality and process stability, in some embodiments, before cutting and welding the iron core strip to be joined according to the cutting and welding path in step S5, the method further includes the step of adjusting the laser welding parameters of the cutting and welding device based on the thickness, material, and cutting and welding path of the iron core strip; wherein the laser welding parameters include at least laser power and welding speed; the specific parameter values ​​can be further adjusted according to the model of the cutting and welding equipment and the performance requirements of the product.

[0054] In some preferred embodiments, combined with Figure 6 As shown, the steps for adjusting the laser welding parameters of the cutting and welding device include: S51. Based on the thickness and material of the iron core strip, set the basic energy parameters for laser welding; in some optional embodiments, setting the basic energy parameters specifically includes: Laser power setting: A strategy positively correlated with plate thickness is adopted to ensure sufficient penetration. Taking silicon steel strip as an example, for iron core strip with a thickness T=0.5mm, the system automatically calculates and sets a higher laser power (e.g., 2200W) to ensure sufficient penetration; for iron core strip with a thickness T=0.35mm, a lower power (e.g., 1500W) is set to prevent burn-through and excessive heat effects.

[0055] Welding speed setting: A strategy negatively correlated with plate thickness is adopted to balance heat input. Thicker plates require slower welding speeds to ensure sufficient energy input, while thinner plates can use higher welding speeds to reduce heat input.

[0056] S52. Based on the cutting and welding path, the basic energy parameters are compensated and adjusted. For example, when planning the welding motion, the system predicts the geometric characteristics of the path: in the straight section or large-arc curve section of the path, the control system instructs the laser head to move at a high constant speed; in the complex tortuous section of the path (such as the first type of peaks and troughs, or the third type of introduced tortuous features), the control system automatically reduces the instantaneous movement speed of the laser head, or synchronously fine-tunes the laser power to ensure sufficient energy input at these key geometric features, avoiding defects such as unstable molten pool, incomplete fusion, or undercut caused by centrifugal acceleration or sudden changes in direction; among them, for smooth paths, the continuous wave mode can be preferred to obtain a uniform weld; for complex paths, the pulse mode can be used, and the pulse parameters can be adjusted at the inflection points to better control the heat input.

[0057] This embodiment uses a silicon steel strip with a thickness of T=0.4mm and a planned wavy path with an amplitude of A=0.08mm and a wavelength of λ=1.2mm as an example: The control unit will perform the following collaborative settings: Based on T=0.4mm, the basic laser power is set to P=1800W and the basic welding speed is set to V=1.8m / min.

[0058] Analyze the path curve to identify the apex positions of all peaks and troughs. In the program, add a speed modulation coefficient to these apex positions. For example, within ±10% of the path length near the apex, automatically reduce the welding speed to 1.5m / min, or simultaneously increase the laser power by 100W instantaneously.

[0059] This composite program, which integrates geometric path and parameter modulation information, is then sent to the laser welding actuator.

[0060] This embodiment achieves precise control of the thermal cycle in the welding process by using a dual-factor collaborative decision-making mechanism based on plate thickness and path shape. This results in high-quality welds with stable penetration, uniform forming, and extremely low defect rate, regardless of whether the path is complex or smooth.

[0061] To further avoid setting the cutting and welding path on defects (such as rust spots and scratches) in the iron core strip itself, which would lead to a reduction in welding quality and welding strength and become a potential risk point for subsequent processes, in some preferred embodiments, after the continuous cutting and welding path is generated, or during the actual cutting and welding process, machine vision can be introduced for real-time monitoring and dynamic correction, which can further improve the reliability of the welded joint and the level of system intelligence.

[0062] For example, an industrial vision module (such as a high-resolution line scan camera) integrated on the cutting and welding device acquires image information of the strip surface in real time, the image information covering the non-stamping area where the currently planned path is located; in some optional embodiments, the step further includes: Real-time acquisition of image information of the material strip surface; Based on the image information, it can be identified whether there are inherent defects in the non-stamping area of ​​the iron core strip; If present, the cutting and welding path is locally adjusted to avoid the location of the inherent defect.

[0063] Example 2 This invention also provides a cutting and welding device 100 for iron core strip, used to implement the cutting and welding control method for iron core strip described in any one of Embodiments 1, combined with... Figure 7 As shown, it includes: The frame 10, which serves as the supporting body for the welding and cutting device 100, has a horizontal worktable 11.

[0064] 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.

[0065] 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.

[0066] 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. The control unit is used to obtain the punching information of the iron core strip, that is, to obtain the thickness and layout pattern of the iron core strip, and after generating the corresponding cutting and welding path instructions, 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.

[0067] The welding and cutting device 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.

[0068] In some optional embodiments, a plate thickness detection unit is further included, disposed on the frame 10 and connected to the control unit, for real-time acquisition of the thickness of the core strip. 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 thickness to the control unit. At this time, the control unit is configured to preferentially use the real-time actual thickness 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.

[0069] Example 3 This invention also provides a production equipment for motor cores, including an unwinding device, a core strip cutting and welding device 100 as described in Embodiment 2, and a stamping and forming device arranged in sequence.

[0070] The working process of the equipment for producing the motor core 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.

[0071] 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 strip, while the second core strip is ready. The main control system of the production line issues an instruction, and the cutting and welding device performs the following steps: 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.

[0072] 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.

[0073] This embodiment achieves fully automatic and highly reliable connection between different coils, greatly improving equipment production efficiency; it ensures that all stacks punched out by the stamping forming device are free of weld seams, eliminating the problem of inconsistent motor core performance caused by weld seams at the source, and improving the overall quality and consistency of the product; the motor core production equipment in this embodiment can flexibly handle the production tasks of core strips of different specifications and batches, enhancing the adaptability of the production line.

[0074] Example 4 This invention also provides a motor core, which is manufactured using the same production equipment as described in Embodiment 3. The motor core is a laminated body formed by stamping and stacking, comprising multiple identical iron chips.

[0075] 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.

[0076] 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 controlling the cutting and welding of iron core strip, characterized in that, Includes the following steps: Obtain the punching information of the core strip to be connected; wherein, the punching information includes at least the thickness and layout pattern of the core strip; The cutting and welding trajectory is determined based on the layout pattern of the iron core strip; The non-linear pattern configured in the cutting and welding trajectory is determined based on the thickness of the core strip; Configure the cutting and welding trajectory according to the non-linear pattern to form a cutting and welding path; According to the cutting and welding path, the iron core strips to be connected are cut and welded.

2. The method for controlling the cutting and welding of iron core strip as described in claim 1, characterized in that, Before determining the non-linear pattern configured in the cutting and welding trajectory based on the thickness of the core strip, the method further includes the following steps: The thickness of the core strip is used to determine whether the cutting and welding trajectory is configured with a non-linear style.

3. The method for controlling the cutting and welding of iron core strip as described in claim 2, characterized in that, Including the following steps: The thickness of the iron core strip is compared with a preset thickness threshold. If the thickness is greater than or equal to a preset thickness threshold, it is determined that the cutting and welding trajectory is configured as a non-linear pattern. If the thickness is less than the preset thickness threshold, it is determined that the cutting and welding trajectory is configured as a straight line.

4. The method for controlling the cutting and welding of iron core strip as described in claim 1, characterized in that, The steps for determining the non-linear pattern configured in the cutting and welding trajectory based on the thickness of the iron core strip include: The thickness range is determined based on the thickness of the core strip. When the thickness is within the first thickness range, the non-linear style is selected as a wavy structure; When the thickness is in a second thickness range that is greater than the first thickness range, the non-linear style is selected as a sawtooth structure.

5. The method for controlling the cutting and welding of iron core strip as described in claim 1, characterized in that, The step of configuring the cutting and welding trajectory according to the non-linear pattern includes: Based on the thickness of the core strip and the layout pattern, the geometric parameters of the cutting and welding trajectory are matched.

6. The method for controlling the cutting and welding of iron core strip as described in claim 1, characterized in that, It also includes the step of adjusting the laser welding parameters of the cutting and welding device; wherein the laser welding parameters include at least laser power and welding speed.

7. The method for controlling the cutting and welding of iron core strip as described in claim 6, characterized in that, It also includes the following steps: Based on the thickness and material of the iron core strip, the basic energy parameters for laser welding are set; Based on the cutting and welding path, the basic energy parameters are compensated and adjusted.

8. A cutting and welding device for iron core strip, used to implement the cutting and welding control method for iron core strip as described in any one of claims 1-7, characterized in that, include: frame; A clamping mechanism is provided on the frame to clamp the tail of the first iron core strip and the head of the second iron core strip respectively; A cutting and welding mechanism is disposed on the frame and located above the clamping mechanism; the cutting and welding mechanism includes a laser cutting head and a laser welding head; A control unit, which is connected to the clamping mechanism and the welding mechanism; The control unit is used to obtain the punching information of the iron core strip and generate the corresponding cutting and welding path instructions. Then, it controls the clamping mechanism and the cutting and welding mechanism to work together to cut and weld the tail of the first iron core strip and the head of the second iron core strip.

9. A production equipment for motor cores, characterized in that, It includes an unwinding device, a cutting and welding device for the iron core strip as described in claim 8, and a stamping and forming device arranged in sequence.

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

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