New energy automobile steel row structural member processing process and device

Abstract

The application belongs to the technical field of new energy automobile parts, and particularly relates to a new energy automobile steel row structure part machining process and device, which comprises the following steps: obtaining the resistivity and absolute magnetic permeability of die steel; measuring the effective wall thickness of the die; determining the feasible domain of demagnetization frequency according to a skin depth calculation formula, so that the skin depth is greater than or equal to the effective wall thickness; after blanking, applying an attenuated alternating current pulse to a pulse demagnetization coil at a target frequency to perform penetration demagnetization on the waste material adsorbed in the die; and through visual detection of the waste material falling condition, the auxiliary discharging mechanism is started to remove the residual waste material; the application ensures that the pulse magnetic field effectively penetrates the die steel to act on the waste material through skin depth compensation, eliminates magnetic adhesion from the physical root, has the characteristics of high demagnetization efficiency, no thermal effect, strong self-adaptation and complete adaptation to high-speed stamping rhythm, and significantly improves the stability and safety of the steel row concave die punching process.

Description

Technical Field

[0001] This invention relates to the field of new energy vehicle parts technology, and in particular to a processing technology and device for steel strut structural components of new energy vehicles. Background Technology

[0002] With the rapid development of the new energy vehicle industry, the energy density and safety requirements of power battery systems are constantly increasing. Battery busbars (also known as battery connectors or busbars) are key conductive structural components in battery modules, connecting series and parallel cells. Their processing quality directly affects the electrical connection reliability, internal resistance consistency, and long-term operational safety of the battery pack. Busbars are typically stamped from magnetically conductive materials such as low-carbon steel, nickel-plated steel, or stainless steel, and their structure requires the punching of numerous precisely positioned connection holes, positioning holes, or weight-reduction holes.

[0003] A prominent technical challenge in high-speed stamping of steel sheets has long existed: scrap material after stamping adheres to the die due to residual magnetism, especially adhering to the side wall of the upper die punch or clogging the die cavity. This phenomenon arises because the material undergoes severe plastic deformation and fracture during stamping, resulting in dislocations and slippage in the metal lattice. Simultaneously, the high-speed friction between the punch and the sheet metal generates localized high temperatures. These combined effects lead to disordered magnetic domain arrangement within the material, resulting in high residual magnetism. Since the punch is typically located in the upper die, and conventional compressed air blowing devices are installed in the lower die, they cannot effectively remove the scrap adsorbed on the upper die. If this residual scrap is not removed promptly, it will directly cause die damage and product surface damage during the next stamping cycle, and may even lead to safety accidents, severely restricting production efficiency and yield.

[0004] To address the aforementioned issues, various approaches have been explored in existing technologies. For instance, some solutions employ mechanical scrapers to forcibly remove waste, but these scrapers are prone to wear from prolonged contact and are ineffective against waste with strong adhesion. Other solutions utilize strong magnetic chucks to actively remove waste, but this method can lead to accidental magnetization of other areas, exacerbating the magnetic adhesion problem. Still other solutions propose coating the mold to reduce the coefficient of friction, but coatings are costly and require replating after wear, making maintenance complex.

[0005] In recent years, researchers have proposed using the principle of heating to demagnetize, which involves heating waste materials above the Curie point using high-frequency coils to eliminate magnetism. However, this approach has significant drawbacks: the heating process takes several seconds, severely slowing down production; localized high temperatures may cause changes in the metallographic structure or thermal deformation of the steel strip material, affecting product performance; and the heating device has high energy consumption, which is not conducive to green manufacturing.

[0006] While pulsed demagnetization technology has applications in industrial demagnetization, its application in the confined space of stamping dies faces a key technical obstacle: the pulsed magnetic field needs to penetrate a certain thickness of die steel to act on the scrap. According to electromagnetic field theory, the penetration depth of an alternating magnetic field in a conductor is limited by the skin effect. If the pulse frequency is not properly selected, the magnetic field may attenuate sharply inside the die steel, failing to effectively reach the scrap and leading to demagnetization failure. Current technologies lack systematic research and control methods for the quantitative relationship between the specific structure of the die (wall thickness, material permeability) and pulse parameters.

[0007] Therefore, there is an urgent need in the field for a steel die punching anti-adhesion process and device that can precisely control the penetration capability of pulsed magnetic fields, achieve efficient and reliable demagnetization, and not affect the production cycle, so as to solve the many problems existing in the above-mentioned prior art. Summary of the Invention

[0008] The purpose of this invention is to provide a processing technology and apparatus for steel exhaust structural components of new energy vehicles, so as to solve the problems mentioned in the background art.

[0009] To achieve the above objectives, the present invention provides the following technical solution: a processing technology for steel exhaust structural components of new energy vehicles, comprising the following steps: Step S1: Obtain the material properties of the die steel at the die punching position of the die, wherein the material properties include at least the resistivity ρ and relative permeability μ of the die steel; Step S2: Measure or obtain the effective wall thickness d of the mold at the punching position of the die cavity; Step S3: Calculate the skin depth according to the formula. Determine the feasible domain of the pulse demagnetization frequency f such that the skin depth δ generated at that frequency is greater than or equal to the effective wall thickness d; Step S4: After the punching action is completed in the die, one or more alternating current pulses with attenuated amplitude are applied to the pulse demagnetizing coil embedded in the die based on the target frequency f in the feasible domain to demagnetize the waste material adsorbed in the punch or die. Step S5: Detect whether the waste material falls normally using the vision detection unit. If waste material residue is detected, start the auxiliary discharge mechanism to remove the waste material.

[0010] The processing technology for steel structural components of new energy vehicles according to the present invention, wherein step S3 further includes: when the skin depth δ is less than the effective wall thickness d, reducing the pulse demagnetizing frequency f until the skin depth δ is greater than or equal to the effective wall thickness d, so as to ensure that the pulse magnetic field can effectively penetrate the mold steel and act on the scrap.

[0011] The processing technology for steel strut structural components of new energy vehicles described in this invention, wherein when applying alternating current pulses in step S4, a critically damped attenuated oscillation waveform is used, so that the pulse group attenuates to zero within 3 to 5 oscillation cycles, and the magnetic field direction of adjacent pulses changes alternately.

[0012] The processing technology for steel exhaust structural components of new energy vehicles according to the present invention further includes step S40 before step S4: The initial residual magnetism of the waste material or the die punching area is measured in real time using a Hall sensor placed near the die punching area. ; In step S4, the initial peak field strength H of the applied alternating current pulse is based on the initial remanence value. The dynamic adjustment must satisfy Hp≥3Hc, where Hc is the coercivity of the waste material.

[0013] The processing technology for steel exhaust structural components of new energy vehicles according to the present invention, wherein step S4 further includes a demagnetization effect evaluation and self-learning step: Step S41: After applying the alternating current pulse, measure the residual magnetic field value of the waste area again using the Hall sensor. ; Step S42: If the residual magnetism value Higher than the preset threshold Then based on the deviation value The pulse parameters of the subsequent die punching cycle are automatically corrected, and the pulse parameters include the initial peak field strength Hp or the pulse frequency f.

[0014] The processing technology for steel structural components of new energy vehicles described in this invention includes a pulse demagnetizing coil embedded in the mold in step S4, which is a bottom-mounted coil, specifically installed around the blanking hole of the lower mold, so that the pulse magnetic field penetrates the waste material from bottom to top.

[0015] The processing technology for steel structural components of new energy vehicles according to the present invention includes an auxiliary material discharge mechanism in step S5, which includes a micro-negative pressure channel disposed inside the punch. After demagnetization is completed, negative pressure is applied through the micro-negative pressure channel to guide the waste material to fall.

[0016] The new energy vehicle steel structure component processing technology of the present invention includes an auxiliary material feeding mechanism in step S5, which further includes a spare ejector pin set on the upper mold. When the vision detection unit detects waste material residue multiple times in a row, the spare ejector pin is activated to force the waste material out.

[0017] The processing technology for steel strip structural components of new energy vehicles according to the present invention includes, before step S1, step S0: performing a micro-lubrication treatment on the surface of the steel strip to be punched by the die to reduce frictional magnetization during the punching process.

[0018] Furthermore, the present invention also provides a punching die device for a new energy battery steel strip cavity for realizing the processing technology described above, comprising: Lower die assembly, the lower die assembly including a punch; Upper die assembly, the upper die assembly including a die hole that mates with the punch; A pulse demagnetizing coil is embedded in the upper mold assembly and coaxially sleeved on the outside of the die punching position; A pulse power supply, electrically connected to the pulse demagnetizing coil, is used to generate alternating current pulses with attenuated amplitude; The controller has a pre-stored penetration compensation model based on the skin depth calculation formula, and controls the output frequency and field strength of the pulse power supply according to the mold wall thickness and material properties. A Hall sensor, mounted on the auxiliary feeding mechanism and located inside the die punch, is connected to the controller and used to measure the residual magnetism value in real time. A vision inspection unit is installed on the horizontal side of the mold to detect whether waste material has fallen off; An auxiliary material discharge mechanism is installed inside the upper mold assembly to remove residual waste material when visual inspection reveals abnormalities.

[0019] Compared with the prior art, the beneficial effects of the present invention are as follows: This step obtains the mold material properties and wall thickness, and determines the feasible domain of demagnetization frequency based on the skin depth calculation formula. This ensures that the pulsed magnetic field can effectively penetrate the mold steel and act on the scrap, solving the problem of the magnetic field being shielded by the mold from a physical principle level, and laying the foundation for reliable demagnetization in the future. Attached Figure Description

[0020] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0021] Figure 1 This is a flowchart of the process method steps in Embodiment 1 of the present invention.

[0022] Figure 2 This is a side view of the structure of Embodiment 2 of the present invention.

[0023] Figure 3 This is a longitudinal sectional view of the structure of Embodiment 2 of the present invention.

[0024] Figure 4 for Figure 3Enlarged view of a local structure. Detailed Implementation

[0025] The terms "first," "second," "third," and "fourth," etc., used in the specification, claims, and accompanying drawings of this invention are used to distinguish different objects, not to describe a specific order. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion. For example, a process, method, system, product, or apparatus that includes a series of steps or units is not limited to the listed steps or units, but may optionally include steps or units not listed, or may optionally include other steps or units inherent to these processes, methods, products, or apparatuses.

[0026] In this document, the term "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of the invention. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0027] "Multiple" refers to two or more. "And / or" describes the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A alone, A and B simultaneously, or B alone. The character " / " generally indicates that the preceding and following related objects have an "or" relationship.

[0028] Furthermore, the terms indicating orientation, such as "up," "down," "left," "right," "upper end," "lower end," and "longitudinal," are all based on the posture and position of the device or equipment described in this solution during normal use.

[0029] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, a clear and complete description will be provided below in conjunction with the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the protection scope of the present invention.

[0030] Example 1 This embodiment discloses, as follows: Figure 1 The processing technology for steel exhaust structural components in new energy vehicles, as shown, includes the following steps: Step S1: Obtain the material properties of the die steel at the die punching position of the die, wherein the material properties include at least the resistivity ρ and relative permeability μ of the die steel; Step S2: Measure or obtain the effective wall thickness d of the mold at the punching position of the die cavity; Step S3: Calculate the skin depth according to the formula. Determine the feasible domain of the pulse demagnetization frequency f such that the skin depth δ generated at that frequency is greater than or equal to the effective wall thickness d; Step S4: After the punching action is completed in the die, one or more alternating current pulses with attenuated amplitude are applied to the pulse demagnetizing coil embedded in the die based on the target frequency f in the feasible domain to demagnetize the waste material adsorbed in the punch or die. Step S5: Detect whether the waste material falls normally using the vision detection unit. If waste material residue is detected, start the auxiliary discharge mechanism to remove the waste material.

[0031] This step obtains the mold material properties and wall thickness, and determines the feasible domain of demagnetization frequency based on the skin depth calculation formula. This ensures that the pulsed magnetic field can effectively penetrate the mold steel and act on the scrap, solving the problem of the magnetic field being shielded by the mold from a physical principle level, and laying the foundation for reliable demagnetization in the future.

[0032] In this embodiment, step S3 further includes: when the skin depth δ is less than the effective wall thickness d, reducing the pulse demagnetizing frequency f until the skin depth δ is greater than or equal to the effective wall thickness d, so as to ensure that the pulse magnetic field can effectively penetrate the mold steel and act on the scrap; by dynamically reducing the frequency until the skin depth is greater than the wall thickness, active compensation for the magnetic field penetration capability is achieved, ensuring that even for thick-walled molds or high magnetic permeability materials, the pulse magnetic field can still effectively reach the scrap position, improving the versatility and adaptability of the process.

[0033] In this embodiment, when applying the alternating current pulse in step S4, a critically damped decay oscillation waveform is used to make the pulse group decay to zero within 3 to 5 oscillation cycles, and the magnetic field direction of adjacent pulses changes alternately. By using the critically damped decay oscillation waveform and controlling the number of pulses, demagnetization can be completed in a very short time (millisecond level), while avoiding secondary magnetization of the mold caused by overshoot current, thus ensuring demagnetization efficiency and equipment safety.

[0034] In this embodiment, before step S4, step S40 is also included: The initial residual magnetism of the waste material or the die punching area is measured in real time using a Hall sensor placed near the die punching area. In step S4, the initial peak field strength H of the applied alternating current pulse is based on the initial remanence value. The system dynamically adjusts the field strength to ensure that Hp ≥ 3Hc, where Hc is the coercivity of the waste material. The initial residual magnetism is measured in real time by a Hall sensor, and the peak field strength is dynamically adjusted accordingly to achieve precise demagnetization "on demand". This ensures the demagnetization effect (field strength ≥ 3 times the coercivity) while avoiding unnecessary energy waste and reducing energy consumption.

[0035] In this embodiment, step S4 further includes a demagnetization effect evaluation and self-learning step: Step S41: After applying the alternating current pulse, measure the residual magnetic field value of the waste area again using the Hall sensor. ; Step S42: If the residual magnetism value Higher than the preset threshold Then based on the deviation value The pulse parameters of subsequent die punching cycles are automatically corrected. The pulse parameters include the initial peak field strength Hp or the pulse frequency f. By measuring and feeding back the residual magnetism after demagnetization, a closed-loop self-learning control is formed, enabling the system to automatically optimize subsequent pulse parameters, continuously improve demagnetization accuracy during long-term operation, and adapt to changes such as material batch differences and die wear.

[0036] In this embodiment, the pulse demagnetizing coil embedded in the mold in step S4 is a bottom-mounted coil, specifically installed around the blanking hole of the lower mold, so that the pulse magnetic field penetrates the waste material from bottom to top, and the magnetic field acts directly on the waste material from bottom to top, completely bypassing the shielding problem of the mold steel. The structure is simple and the demagnetizing effect is more stable and reliable.

[0037] In this embodiment, the auxiliary material discharge mechanism in step S5 includes a micro negative pressure channel set inside the punch. After demagnetization is completed, negative pressure is applied through the micro negative pressure channel to guide the waste material to fall. The weak negative pressure can guide the demagnetized waste material to fall smoothly, serving as the first waste discharge guarantee after demagnetization. The structure is compact and does not interfere with the stamping action.

[0038] In this embodiment, the auxiliary material feeding mechanism in step S5 also includes a spare ejector pin installed on the upper mold. When the vision detection unit detects residual waste material multiple times in a row, the spare ejector pin is activated to force the waste material out. The spare ejector pin serves as a last mechanical safety measure in extreme cases. When the vision detection unit confirms residual waste material multiple times, it forces the waste material out, completely eliminating mold damage accidents caused by waste material accumulation and improving equipment safety.

[0039] In this embodiment, before step S1, step S0 is also included: performing a small amount of lubrication treatment on the surface of the steel strip to be punched in the die to reduce frictional magnetization during the punching process, thereby reducing the burden of subsequent demagnetization and extending the die life.

[0040] Example 2 This embodiment is basically the same as Embodiment 1, and the similarities will not be repeated. The difference is that this embodiment discloses as follows: Figures 2 to 4 The device shown is a punching die for a new energy battery steel strip, used to implement the processing technology described in Embodiment 1. It includes: Lower die assembly 10, the lower die assembly including punch 101; Upper die assembly 20, the upper die assembly including a die hole 201 that mates with the punch; The pulse demagnetizing coil 30 is embedded in the upper mold assembly and coaxially sleeved on the outside of the die punching position; A pulse power supply, electrically connected to the pulse demagnetizing coil, is used to generate alternating current pulses with attenuated amplitude; The controller has a pre-stored penetration compensation model based on the skin depth calculation formula, and controls the output frequency and field strength of the pulse power supply according to the mold wall thickness and material properties. Hall sensor 40 is mounted on the auxiliary feeding mechanism and located inside the die punch hole. It is connected to the controller and is used to measure the residual magnetism value in real time. A vision inspection unit 50 is set on the horizontal side of the mold to detect whether waste material has fallen off; An auxiliary material feeding mechanism 60 is disposed within the upper mold assembly and is used to remove residual waste material when visual detection is abnormal; while in the initial state, it moves the Hall sensor upward away from the pulse demagnetizing coil.

[0041] It should be understood that those skilled in the art can make improvements or modifications based on the above description, and all such improvements and modifications should fall within the protection scope of the appended claims.

Claims

1. A processing technology for steel exhaust structural components of new energy vehicles, characterized in that, Includes the following steps: Step S1: Obtain the material properties of the die steel at the die punching position of the die, wherein the material properties include at least the resistivity ρ and relative permeability μ of the die steel; Step S2: Measure or obtain the effective wall thickness d of the mold at the punching position of the die cavity; Step S3: Calculate the skin depth according to the formula. Determine the feasible domain of the pulse demagnetization frequency f such that the skin depth δ generated at that frequency is greater than or equal to the effective wall thickness d; Step S4: After the punching action is completed in the die, one or more alternating current pulses with attenuated amplitude are applied to the pulse demagnetizing coil embedded in the die based on the target frequency f in the feasible domain to demagnetize the waste material adsorbed in the punch or die. Step S5: Detect whether the waste material falls normally using the vision detection unit. If waste material residue is detected, start the auxiliary discharge mechanism to remove the waste material.

2. The processing technology for steel exhaust structural components of new energy vehicles according to claim 1, characterized in that, Step S3 further includes: when the skin depth δ is less than the effective wall thickness d, reducing the pulse demagnetizing frequency f until the skin depth δ is greater than or equal to the effective wall thickness d, so as to ensure that the pulse magnetic field can effectively penetrate the mold steel and act on the scrap.

3. The processing technology for steel exhaust structural components of new energy vehicles according to claim 1, characterized in that, When applying alternating current pulses in step S4, a critically damped decay oscillation waveform is used to make the pulse group decay to zero within 3 to 5 oscillation cycles, and the magnetic field direction of adjacent pulses changes alternately.

4. The processing technology for steel exhaust structural components of new energy vehicles according to claim 1 or 3, characterized in that, Before step S4, step S40 is also included: The initial residual magnetism of the waste material or the die punching area is measured in real time using a Hall sensor placed near the die punching area. ; In step S4, the initial peak field strength H of the applied alternating current pulse is based on the initial remanence value. The dynamic adjustment must satisfy Hp≥3Hc, where Hc is the coercivity of the waste material.

5. The processing technology for steel exhaust structural components of new energy vehicles according to claim 4, characterized in that, Step S4 also includes a demagnetization effect evaluation and self-learning step: Step S41: After applying the alternating current pulse, measure the residual magnetic field value of the waste area again using the Hall sensor. ; Step S42: If the residual magnetism value Higher than the preset threshold Then based on the deviation value The pulse parameters of the subsequent die punching cycle are automatically corrected, and the pulse parameters include the initial peak field strength Hp or the pulse frequency f.

6. The processing technology for steel exhaust structural components of new energy vehicles according to claim 1, characterized in that, In step S4, the pulse demagnetizing coil embedded in the mold is a bottom-mounted coil, specifically installed around the material drop hole of the lower mold, so that the pulse magnetic field penetrates the waste material from bottom to top.

7. The processing technology for steel exhaust structural components of new energy vehicles according to claim 6, characterized in that, The auxiliary discharge mechanism in step S5 includes a micro-negative pressure channel inside the punch. After demagnetization is completed, negative pressure is applied through the micro-negative pressure channel to guide the waste material to fall.

8. The processing technology for steel exhaust structural components of new energy vehicles according to claim 7, characterized in that, The auxiliary material discharge mechanism in step S5 also includes a spare ejector pin set on the upper mold. When the vision detection unit detects waste material residue multiple times in a row, the spare ejector pin is activated to force the waste material out.

9. The processing technology for steel exhaust structural components of new energy vehicles according to claim 1, characterized in that, Before step S1, step S0 is also included: applying a small amount of lubrication to the surface of the steel strip to be punched by the die to reduce frictional magnetization during the punching process.

10. A punching die device for steel strip die of new energy battery for implementing the processing technology of any one of claims 1 to 9, characterized in that, include: Lower die assembly, the lower die assembly including a punch; Upper die assembly, the upper die assembly including a die hole that mates with the punch; A pulse demagnetizing coil is embedded in the upper mold assembly and coaxially sleeved on the outside of the die punching position; A pulse power supply, electrically connected to the pulse demagnetizing coil, is used to generate alternating current pulses with attenuated amplitude; The controller has a pre-stored penetration compensation model based on the skin depth calculation formula, and controls the output frequency and field strength of the pulse power supply according to the mold wall thickness and material properties. A Hall sensor, mounted on the auxiliary feeding mechanism and located inside the die punch, is connected to the controller and used to measure the residual magnetism value in real time. A vision inspection unit is installed on the horizontal side of the mold to detect whether waste material has fallen off; An auxiliary material discharge mechanism is installed inside the upper mold assembly to remove residual waste material when visual inspection reveals abnormalities.

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