Vehicle body cold stamping die manufacturing method based on laser cladding

Abstract

The invention provides a vehicle body cold stamping die manufacturing method based on laser cladding, and relates to the technical field of laser cladding. Roughly machining the die body; r angle reinforcement is conducted on the mold body subjected to rough machining, wherein R angle reinforcement comprises cladding of a first cladding layer at the preset position of the R angle through a laser cladding technology; the die body is subjected to finish machining; and grinding, debugging and precision adjustment are conducted on the die body after finish machining, and a finished die product is obtained. According to the invention, the first cladding layer is cladded at the preset position of the R angle through the laser cladding process, so that the thickness of the first cladding layer can be accurately controlled, the R angle performance of the mold finished product is enhanced, and the manufacturing quality of the mold finished product is improved.

Description

Technical Field

[0001] The invention relates to the technical field of laser cladding, and in particular to a method for manufacturing a car body cold stamping die based on laser cladding. Background Art

[0002] The cold stamping die for the car body is a process equipment that applies pressure to the metal sheet through a press to make it plastically deform or separate, and finally forms the structural parts of the car body (such as doors, hoods, roofs, etc.). Its characteristics include: high efficiency and low consumption, high precision and stability, suitable for mass production, high cost-effectiveness, and high dimensional accuracy and good surface quality of the product parts, which can be directly used in subsequent painting and other processes.

[0003] The manufacturing of cold stamping dies for car bodies requires high surface accuracy and strong wear resistance of R corners. Traditional processes usually use integral alloy steel billets to make cold stamping dies through rough machining, heat treatment, and fine machining processes. Although the local hardness can be improved through heat treatment processes, heat treatment is prone to deformation, and the depth of the hardened layer in the R corner area cannot be accurately controlled, resulting in uneven hardening problems; for the surface, manual surfacing is usually used, which can easily cause cracks, pores and other quality defects on the mold surface, reducing the production quality of cold stamping dies. Summary of the invention

[0004] The present invention provides a method for manufacturing a cold stamping die for a vehicle body based on laser cladding, so as to solve at least one technical problem raised in the above-mentioned background technology.

[0005] In order to solve the above technical problems, the present invention discloses a method for manufacturing a cold stamping die for a car body based on laser cladding, comprising: Casting the mold body based on the designed dimensions; Rough machining of the mold body; Performing R corner reinforcement on the mold body after rough machining, wherein the R corner reinforcement includes cladding a first cladding layer at a preset position of the R corner through a laser cladding process; Finishing of the mold body; The mold body after fine processing is ground, debugged and precision adjusted to obtain the finished mold product.

[0006] Preferably, the rough processing of the mold body includes grooving the mold body and removing impurities in the groove by laser.

[0007] Preferably, laser removal of impurities in the groove includes: Scan the area inside the groove by a visual scanning device to generate an original removal trajectory of the laser beam; The original removal trajectory is sent to the multi-axis robot, which generates a temporary removal trajectory based on the original removal trajectory and drives the laser head to move along the temporary removal trajectory to emit a laser beam, thereby removing impurities in the groove.

[0008] Preferably, the multi-axis manipulator generates a temporary removal trajectory based on the original removal trajectory, and drives the laser head to move along the temporary removal trajectory to emit a laser beam, including: The multi-axis manipulator drives the visual scanning device to move based on the original removal trajectory and scan along the original removal trajectory to obtain the impurity area in the original removal trajectory and generate removal marking points; Add the removal marker points to the original removal trajectory to generate a temporary removal trajectory; Removing impurities on the temporary removal track, including: a laser head and a visual scanning device move based on the temporary removal track, the laser head emits a laser beam based on a removal mark point to remove impurities on the temporary removal track, the visual scanning device obtains an impurity area in the temporary removal track and generates a new removal mark point, and the new removal mark point is added to the temporary removal track; The impurities on the temporary removal track are removed repeatedly until no new impurity area is obtained, and the impurity removal in the groove is completed.

[0009] Preferably, the temporary removal trajectory includes a trajectory generated by adding some or all of the removal marker points based on the original removal trajectory.

[0010] Preferably, the laser cladding process comprises: Obtain the geometric model of the cladding area and generate the initial cladding trajectory; The laser head performs laser cladding based on the initial cladding trajectory, and obtains cladding layer thickness monitoring data along the initial cladding trajectory; Based on the cladding layer thickness monitoring data, the initial cladding trajectory is adjusted to generate the transition cladding trajectory; The laser head performs laser cladding again based on the transition cladding trajectory and obtains the cladding degree of the cladding area; It is determined whether the cladding degree reaches the preset cladding degree. If not, a target cladding trajectory is generated, and the laser head completes laser cladding based on the target cladding trajectory.

[0011] Preferably, adjusting the initial cladding trajectory based on the cladding layer thickness monitoring data to generate the transition cladding trajectory includes: The cladding layer thickness monitoring data is divided into a plurality of monitoring sub-areas along the initial cladding trajectory, each monitoring sub-area includes a plurality of monitoring points, the thickness of the plurality of monitoring points in each monitoring sub-area is counted, and the average thickness of the monitoring sub-area is calculated; The average thickness of the monitoring sub-area is compared with the preset thickness. When the average thickness of the monitoring sub-area is less than the preset thickness, it indicates that the cladding layer in the monitoring sub-area is too thin. When the laser head passes through the monitoring sub-area, the laser scanning speed is reduced and the laser power is increased. When the average thickness of the monitoring sub-area is greater than the preset thickness, it indicates that the cladding layer in the monitoring sub-area is too thick. When the laser head passes through the monitoring sub-area, the laser scanning speed is increased and the laser power is reduced. Based on the comparison result between the average thickness of the monitored sub-area and the preset thickness, the initial cladding trajectory is adjusted to generate a transition cladding trajectory.

[0012] Preferably, obtaining the cladding degree of the cladding area includes: The sum of the cladding volumes of all monitored sub-areas in the cladding area is calculated to obtain the actual cladding volume. The ratio of the actual cladding volume to the preset cladding volume is the cladding degree. When the cladding degree does not reach the preset cladding degree, the cladding volume of each monitoring sub-area is compared with the standard cladding volume. When the cladding volume of the monitoring sub-area is less than the standard cladding volume, it is marked as an unclad area.

[0013] Preferably, finishing the mold body includes machining the first cladding layer to a target size to obtain an R angle.

[0014] Preferably, the precision adjustment includes performing profile compensation on the mold body based on the precision of the stamping part, and the profile compensation includes: planning a compensation range at the profile pre-cladding position; pre-treatment before cladding; laser cladding the second cladding layer; and precision machining the second cladding layer.

[0015] The technical solution of the present invention has the following advantages: The present invention provides a method for manufacturing a cold stamping die for a car body based on laser cladding, which relates to the technical field of laser cladding, including casting a die body based on the design size; rough machining the die body; performing R-angle reinforcement on the die body after rough machining, wherein the R-angle reinforcement includes cladding a first cladding layer at a preset position of the R angle through a laser cladding process; fine machining the die body; grinding, debugging, and precision adjustment of the finely machined die body to obtain a finished die. In the present invention, by cladding the first cladding layer at the preset position of the R angle through the laser cladding process, the thickness of the first cladding layer can be accurately controlled, the R-angle performance of the finished die can be enhanced, and the manufacturing quality of the finished die can be improved.

[0016] Other features and advantages of the present invention will be described in the following description, and partly become apparent from the description, or understood by practicing the present invention. The purpose and other advantages of the present invention can be realized and obtained by the devices particularly pointed out in the written description and the drawings of the description.

[0017] The technical solution of the present invention is further described in detail below through the accompanying drawings and embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the present invention and do not constitute a limitation of the present invention. In the accompanying drawings: Figure 1 This is a flow chart of a method for manufacturing a cold stamping die for a vehicle body based on laser cladding according to the present invention; Figure 2 This is a schematic diagram of laser cladding at the R corner in the present invention; Figure 3 This is a schematic diagram of laser cladding on the middle surface of the present invention.

[0019] In the figure: 1, laser head; 2, laser beam; 3, cladding material; 4, first cladding surface layer; 5, R angle; 6, first cladding bottom layer; 7, mold body; 8, molding surface; 9, second cladding surface layer; 10, second cladding bottom layer. DETAILED DESCRIPTION

[0020] The preferred embodiments of the present invention are described below in conjunction with the accompanying drawings. It should be understood that the preferred embodiments described herein are only used to illustrate and explain the present invention, and are not used to limit the present invention.

[0021] In addition, in the present invention, the descriptions of "first", "second", etc. are only used for descriptive purposes, and do not specifically refer to the order or sequence, nor are they used to limit the present invention. They are only used to distinguish components or operations described with the same technical terms, and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In addition, the technical solutions and technical features between the various embodiments can be combined with each other, but they must be based on the ability of ordinary technicians in the field to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0022] Example 1 The embodiment of the present invention provides a method for manufacturing a cold stamping die for a vehicle body based on laser cladding, such as Figure 1-Figure 3 As shown, including: Casting mold body 7 based on design dimensions; Rough machining of the mold body 7; The R corner 5 is reinforced on the rough-machined mold body 7, and the R corner 5 reinforcement includes cladding a first cladding layer at a preset position of the R corner 5 through a laser cladding process; Finishing the mold body 7; The mold body 7 after fine processing is ground, debugged, and precision adjusted to obtain a finished mold product.

[0023] The working principle and beneficial effects of the above technical solution are as follows: when manufacturing the cold stamping die, the die size is first designed according to the shape of the vehicle body, and the die body 7 is cast based on the designed size. The die body 7 is a casting and can be made of ductile iron; then the die body 7 is rough-machined; then the rough-machined die body 7 is reinforced with an R angle 5, and the R angle 5 reinforcement includes cladding a first cladding layer at a preset position of the R angle 5 through a laser cladding process, and the first cladding layer includes a first cladding bottom layer 6 and a first cladding surface layer 4. The laser head 1 generates a laser beam 2 to clad the cladding material 3 at the preset position of the R angle 5 of the die body 7. The cladding material 3 uses an existing cladding strip or wire, and the first cladding bottom layer 6 can be used to ensure To ensure the bonding strength and stability between the cladding layer and the mold body 7, the thickness of the first cladding bottom layer 6 can be selected to be 0.5mm, the cladding surface layer can provide high hardness, wear resistance, corrosion resistance, oxidation resistance and other properties, the thickness of the cladding surface layer is not less than 3mm, and laser cladding can improve the accuracy of the thickness of the first cladding layer; then the mold body 7 is fine-machined, and the mold body 7 is fine-machined including machining the first cladding layer to the target size, using five-axis linkage to machine the R angle 5 to the target size, with a tolerance of ±0.05mm, and the surface roughness of the R angle 5 Ra≤0.4μm; then the mold body 7 after fine machining is ground, debugged, and precision adjusted using the existing process to obtain the finished mold product, and finally mass production acceptance. In the present invention, the first cladding layer is clad at the preset position of the R angle 5 by the laser cladding process, which can accurately control the thickness of the first cladding layer, enhance the R angle 5 performance of the finished mold, and improve the manufacturing quality of the finished mold.

[0024] Example 2 On the basis of the above-mentioned embodiment 1, the rough processing of the mold body 7 includes grooving the mold body 7 and removing impurities in the groove by laser; Laser removal of impurities in the groove includes: Scanning the area inside the groove by a visual scanning device to generate an original removal trajectory of the laser beam 2; The original removal trajectory is sent to the multi-axis manipulator, which generates a temporary removal trajectory based on the original removal trajectory and drives the laser head 1 to move along the temporary removal trajectory to emit a laser beam 2, thereby removing impurities in the groove; The multi-axis manipulator generates a temporary removal trajectory based on the original removal trajectory, and drives the laser head 1 to move along the temporary removal trajectory to emit a laser beam 2, including: The multi-axis manipulator drives the visual scanning device to move based on the original removal trajectory and scan along the original removal trajectory to obtain the impurity area in the original removal trajectory and generate removal marking points; Add the removal marker points to the original removal trajectory to generate a temporary removal trajectory; Removing impurities on a temporary removal track, including: a laser head 1 and a visual scanning device move based on the temporary removal track, the laser head 1 emits a laser beam 2 based on a removal mark point to remove impurities on the temporary removal track, the visual scanning device acquires an impurity area in the temporary removal track and generates a new removal mark point, and adds the new removal mark point to the temporary removal track; Repeat the removal of impurities on the temporary removal track until no new impurity area is obtained, and the impurity removal in the groove is completed; The temporary removal track includes a track generated by adding some or all of the removal markers based on the original removal track.

[0025] The working principle and beneficial effects of the above technical solution are as follows: during rough processing, a groove is made on the mold body 7 based on the groove size, with a groove depth of 3mm, and then the impurities in the groove are removed by the laser beam 2, so as to ensure the cladding effect of the first cladding layer at the preset position of the R angle 5 and improve the processing quality of the R angle 5; the specific steps of using laser to remove impurities in the groove include: firstly, scanning the area in the groove by a visual scanning device to generate an original removal trajectory of the laser beam 2; then sending the original removal trajectory to the multi-axis manipulator, and the multi-axis manipulator generates a temporary removal trajectory based on the original removal trajectory. Specifically, the multi-axis manipulator drives the visual scanning device to move based on the original removal trajectory and scan along the original removal trajectory, obtains the impurity area in the original removal trajectory and generates a removal mark point; adds the removal mark point to the original removal trajectory to generate a temporary removal trajectory; removes impurities on the temporary removal trajectory, including: a laser head 1 and a visual scanning device The scanning device moves based on the temporary removal trajectory, the laser head 1 emits a laser beam 2 based on the removal mark point to remove impurities on the temporary removal trajectory, the visual scanning device obtains the impurity area in the temporary removal trajectory and generates a new removal mark point, and the new removal mark point is added to the temporary removal trajectory; the impurities on the temporary removal trajectory are repeatedly removed until no new impurity area is obtained, and the impurity removal in the groove is completed; the temporary removal trajectory includes a trajectory generated by adding some or all removal mark points based on the original removal trajectory; the laser head 1 moves along the temporary removal trajectory to emit a laser beam 2, so as to remove impurities in the groove; through the above scheme, the impurities in the groove can be removed multiple times until the impurities are completely removed, avoiding impurities from being missed, thereby improving the impurity removal effect and the cladding effect of the first cladding layer, and the laser head 1 only emits the laser beam 2 at the removal mark point to remove impurities in a targeted manner, thereby achieving energy-saving effects.

[0026] Example 3 Based on Example 1 or 2, the laser cladding process includes: Obtain the geometric model of the cladding area and generate the initial cladding trajectory; The laser head 1 performs laser cladding based on the initial cladding trajectory, and obtains cladding layer thickness monitoring data along the initial cladding trajectory; Based on the cladding layer thickness monitoring data, the initial cladding trajectory is adjusted to generate the transition cladding trajectory; The laser head 1 performs laser cladding again based on the transition cladding trajectory and obtains the cladding degree of the cladding area; Determine whether the cladding degree reaches the preset cladding degree, if not, generate a target cladding trajectory, and the laser head 1 completes the laser cladding based on the target cladding trajectory; Based on the cladding layer thickness monitoring data, the initial cladding trajectory is adjusted to generate the transition cladding trajectory including: The cladding layer thickness monitoring data is divided into a plurality of monitoring sub-areas along the initial cladding trajectory, each monitoring sub-area includes a plurality of monitoring points, the thickness of the plurality of monitoring points in each monitoring sub-area is counted, and the average thickness of the monitoring sub-area is calculated; The average thickness of the monitoring sub-area is compared with the preset thickness. When the average thickness of the monitoring sub-area is less than the preset thickness, it indicates that the cladding layer in the monitoring sub-area is too thin. When the laser head 1 passes through the monitoring sub-area, the laser scanning speed is reduced and the laser power is increased. When the average thickness of the monitoring sub-area is greater than the preset thickness, it indicates that the cladding layer in the monitoring sub-area is too thick. When the laser head 1 passes through the monitoring sub-area, the laser scanning speed is increased and the laser power is reduced. Based on the comparison result between the average thickness of the monitored sub-area and the preset thickness, the initial cladding trajectory is adjusted to generate a transition cladding trajectory; Obtaining the cladding extent of the cladding area includes: The sum of the cladding volumes of all monitored sub-areas in the cladding area is calculated to obtain the actual cladding volume. The ratio of the actual cladding volume to the preset cladding volume is the cladding degree. When the cladding degree does not reach the preset cladding degree, the cladding volume of each monitoring sub-area is compared with the standard cladding volume. When the cladding volume of the monitoring sub-area is less than the standard cladding volume, it is marked as an unclad area.

[0027] The working principle and beneficial effects of the above technical solution are as follows: the laser cladding equipment includes a multi-axis manipulator and a laser head 1 arranged at the moving end of the multi-axis manipulator. The multi-axis manipulator can drive the laser head 1 to move. The laser head 1 emits a laser beam 2 and clads the cladding material 3 at the preset position of the R corner 5 of the mold body 7 or the mold surface 8. Specifically, Figure 2As shown, when laser cladding is performed on the preset position of the R angle 5, the three-dimensional geometric model of the preset position of the R angle 5 of the mold body 7 can be first obtained by a laser scanning device, and then an initial cladding trajectory is generated. Then, the laser head 1 performs laser cladding at the preset position of the R angle 5 according to the initial cladding trajectory to prepare a cladding layer, and the cladding layer thickness monitoring data is obtained in real time through a thickness monitoring device. Then, according to the cladding layer thickness monitoring data, the initial cladding trajectory is adjusted to generate a transition cladding trajectory. Specifically, the cladding layer thickness monitoring data is first divided into a plurality of monitoring sub-areas along the initial cladding trajectory, and the monitoring sub-areas contain equally spaced settings. The thickness of the multiple monitoring points in each monitoring sub-area is counted, and the average thickness of the monitoring sub-area is calculated; the average thickness of the monitoring sub-area is compared with the preset thickness. When the average thickness of the monitoring sub-area is less than the preset thickness, it means that the cladding layer in the monitoring sub-area is too thin. When the laser head 1 passes through the monitoring sub-area, the laser scanning speed is reduced and the laser power is increased to increase the cladding thickness of the monitoring sub-area; when the average thickness of the monitoring sub-area is greater than the preset thickness, it means that the cladding layer in the monitoring sub-area is too thick. When the laser head 1 passes through the monitoring sub-area, the laser scanning speed is increased and the laser power is reduced. Low laser power can make the laser head 1 pass through the monitoring sub-area faster during the second cladding, reduce the secondary cladding thickness, and thus effectively reduce the overall cladding thickness of the monitoring sub-area, so that the cladding thickness of the monitoring sub-area is close to the preset thickness; based on the comparison result between the average thickness of the monitoring sub-area and the preset thickness, the initial cladding trajectory is adjusted to generate a transition cladding trajectory, and the laser head 1 performs laser cladding again based on the transition cladding trajectory, so that the laser head 1 adaptively adjusts the laser scanning speed and laser power when passing through a thinner or thicker cladding layer, thereby improving the consistency of the cladding layer thickness and improving the laser The automation degree of the optical cladding equipment is to obtain the cladding degree of the cladding area after laser cladding is performed again. Specifically, the sum of the cladding volumes of all the monitoring sub-areas in the cladding area is calculated first. The cladding volume of the monitoring sub-area is the area of ​​the monitoring sub-area multiplied by the average thickness of the monitoring sub-area. Then, the cladding volumes of all the monitoring sub-areas are added to obtain the actual cladding volume. The ratio of the actual cladding volume to the preset cladding volume is the cladding degree of the cladding area. Finally, it is determined whether the cladding degree of the cladding area reaches the preset cladding degree. If it reaches the preset cladding degree, the laser head 1 stops working and the laser cladding is completed.If the cladding degree of the cladding area does not reach the preset cladding degree, the cladding volume of each monitoring sub-area is compared with the standard cladding volume. When the cladding volume of the monitoring sub-area is less than the standard cladding volume, it is marked as an unclad area, and a target cladding trajectory is generated according to the unclad area. The laser head 1 performs laser cladding again based on the target cladding trajectory to complete the laser cladding work. Through the above scheme, the cladding trajectory can be dynamically adjusted to ensure that the cladding thickness and cladding volume reach the preset standard, reduce the problem of uneven cladding thickness, and avoid the problem of missing cladding or over-thick cladding, improve the quality of laser cladding, and further improve the quality of the finished mold. The cladding process does not require manual participation, which greatly improves the automation of laser cladding and the manufacturing efficiency of the finished mold. ;

[0028] Example 4 Based on any one of Examples 1-3, the precision adjustment includes compensating the mold surface 8 of the mold body 7 based on the precision of the stamping part, and the compensation of the mold surface 8 includes: planning the compensation range at the pre-cladding position of the mold surface 8; pretreatment before cladding; laser cladding the second cladding layer; and precision machining of the second cladding layer.

[0029] The working principle and beneficial effects of the above technical solution are as follows: when adjusting the precision, the mold body 7 is compensated for the profile 8 based on the precision of the stamping part. The stamping part is formed by cold stamping using the mold body 7. Specifically, the mold body 7 is first used to make the stamping part, and then the precision of the stamping part is tested. Based on the precision of the stamping part, the mold body 7 is compensated for the profile 8 for the first time, and then the mold body 7 after the first compensation is used to stamp the stamping part again, and the precision of the stamping part is tested. Based on the precision of the stamping part, the mold body 7 is compensated for the profile 8 for the second time, and the above steps are repeated. The mold body 7 after the N-1th compensation is used to stamp the stamping part again, and the precision of the stamping part is tested. Based on the precision of the stamping part, the mold body 7 is compensated for the profile 8 for the Nth time, until the precision of the stamping part made using the mold body 7 reaches the preset precision range. At this time, the compensation of the profile 8 is completed. When compensating the profile 8, the compensation range is first planned at the pre-cladding position of the profile 8, and then pretreatment is performed to ensure the cleanliness of the profile 8. Then, as Figure 3As shown, according to the above laser cladding process, the first laser cladding is performed at the pre-cladding position of the mold surface 8, and the first compensation is performed after cladding. Then, the mold body 7 is debugged again. Based on the accuracy of the stamped part after debugging, the second compensation is performed through the second laser cladding. The above steps are repeated, and the Nth compensation is performed through the Nth laser cladding until the accuracy of the stamped part reaches the preset accuracy range. At this time, the second cladding layer is prepared. The second cladding layer includes a second cladding surface layer 9 and a second cladding bottom layer 10. The second cladding surface layer 9 and the second cladding bottom layer 10 can be laser clad by two laser heads 1 respectively to improve the cladding efficiency. Finally, the accuracy of the stamped part made by the mold body 7 is within the preset accuracy range, and the accuracy of the stamped part is qualified. The mold body 7 can be delivered to the customer and mass production acceptance can be carried out. In the laser cladding process, interlayer forced cooling can be used to suppress heat accumulation, avoid deformation of the mold body 7, and improve product quality. The above-mentioned mold surface 8 compensation can optimize the processing quality of the mold surface 8 and reduce quality defects such as cracks and pores on the mold surface.

[0030] In the description of the present invention, it is to be understood that the terms “center”, “longitudinal”, “lateral”, “length”, “width”, “thickness”, “up”, “down”, “front”, “back”, “left”, “right”, “vertical”, “horizontal”, “top”, “bottom”, “inside”, “outside”, “clockwise”, “counterclockwise”, “axial”, “radial”, “circumferential”, etc., indicating orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0031] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral one; it can be a mechanical connection, an electrical connection, or communication with each other; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0032] Although the embodiments of the present invention have been disclosed as above, they are not limited to the applications listed in the specification and the implementation methods. They can be fully applied to various fields suitable for the present invention. For those familiar with the art, additional modifications can be easily implemented. Therefore, without departing from the general concept defined by the claims and the scope of equivalents, the present invention is not limited to the specific details and the illustrations shown and described herein.

Claims

1. A method for manufacturing a cold stamping die for a car body based on laser cladding, characterized in that: include: Casting the mold body based on the designed dimensions; Rough machining of the mold body; Performing R corner reinforcement on the mold body after rough machining, wherein the R corner reinforcement includes cladding a first cladding layer at a preset position of the R corner through a laser cladding process; Finishing of the mold body; The mold body after fine processing is ground, debugged and precision adjusted to obtain the finished mold product.

2. The method for manufacturing a cold stamping die for a vehicle body based on laser cladding according to claim 1, characterized in that: The rough processing of the mold body includes grooving the mold body and removing impurities in the groove by laser.

3. The method for manufacturing a cold stamping die for a vehicle body based on laser cladding according to claim 2, characterized in that: Laser removal of impurities in the groove includes: Scan the area inside the groove by a visual scanning device to generate an original removal trajectory of the laser beam; The original removal trajectory is sent to the multi-axis robot, which generates a temporary removal trajectory based on the original removal trajectory and drives the laser head to move along the temporary removal trajectory to emit a laser beam, thereby removing impurities in the groove.

4. The method for manufacturing a cold stamping die for a vehicle body based on laser cladding according to claim 3, characterized in that: The multi-axis manipulator generates a temporary removal trajectory based on the original removal trajectory, and drives the laser head to move along the temporary removal trajectory to emit a laser beam, including: The multi-axis manipulator drives the visual scanning device to move based on the original removal trajectory and scan along the original removal trajectory to obtain the impurity area in the original removal trajectory and generate removal marking points; Add the removal marker points to the original removal trajectory to generate a temporary removal trajectory; Removing impurities on the temporary removal track, including: a laser head and a visual scanning device move based on the temporary removal track, the laser head emits a laser beam based on a removal mark point to remove impurities on the temporary removal track, the visual scanning device obtains an impurity area in the temporary removal track and generates a new removal mark point, and the new removal mark point is added to the temporary removal track; The impurities on the temporary removal track are removed repeatedly until no new impurity area is obtained, and the impurity removal in the groove is completed.

5. The method for manufacturing a cold stamping die for a vehicle body based on laser cladding according to claim 4, characterized in that: The temporary removal track includes a track generated by adding some or all of the removal markers based on the original removal track.

6. The method for manufacturing a cold stamping die for a vehicle body based on laser cladding according to claim 1, characterized in that: Laser cladding processes include: Obtain the geometric model of the cladding area and generate the initial cladding trajectory; The laser head performs laser cladding based on the initial cladding trajectory, and obtains cladding layer thickness monitoring data along the initial cladding trajectory; Based on the cladding layer thickness monitoring data, the initial cladding trajectory is adjusted to generate the transition cladding trajectory; The laser head performs laser cladding again based on the transition cladding trajectory and obtains the cladding degree of the cladding area; It is determined whether the cladding degree reaches the preset cladding degree. If not, a target cladding trajectory is generated, and the laser head completes laser cladding based on the target cladding trajectory.

7. The method for manufacturing a cold stamping die for a vehicle body based on laser cladding according to claim 6, characterized in that: Based on the cladding layer thickness monitoring data, the initial cladding trajectory is adjusted to generate the transition cladding trajectory including: The cladding layer thickness monitoring data is divided into a plurality of monitoring sub-areas along the initial cladding trajectory, each monitoring sub-area includes a plurality of monitoring points, the thickness of the plurality of monitoring points in each monitoring sub-area is counted, and the average thickness of the monitoring sub-area is calculated; The average thickness of the monitoring sub-area is compared with the preset thickness. When the average thickness of the monitoring sub-area is less than the preset thickness, it indicates that the cladding layer in the monitoring sub-area is too thin. When the laser head passes through the monitoring sub-area, the laser scanning speed is reduced and the laser power is increased. When the average thickness of the monitoring sub-area is greater than the preset thickness, it indicates that the cladding layer in the monitoring sub-area is too thick. When the laser head passes through the monitoring sub-area, the laser scanning speed is increased and the laser power is reduced. Based on the comparison result between the average thickness of the monitored sub-area and the preset thickness, the initial cladding trajectory is adjusted to generate a transition cladding trajectory.

8. The method for manufacturing a cold stamping die for a vehicle body based on laser cladding according to claim 7, characterized in that: Obtaining the cladding extent of the cladding area includes: The sum of the cladding volumes of all monitored sub-areas in the cladding area is calculated to obtain the actual cladding volume. The ratio of the actual cladding volume to the preset cladding volume is the cladding degree. When the cladding degree does not reach the preset cladding degree, the cladding volume of each monitoring sub-area is compared with the standard cladding volume. When the cladding volume of the monitoring sub-area is less than the standard cladding volume, it is marked as an unclad area.

9. The method for manufacturing a cold stamping die for a vehicle body based on laser cladding according to claim 1, characterized in that: Finishing the mold body includes machining the first cladding layer to a target size and obtaining an R angle.

10. The method for manufacturing a cold stamping die for a vehicle body based on laser cladding according to claim 1, characterized in that: The precision adjustment includes surface compensation of the mold body based on the precision of the stamping part. The surface compensation includes: planning the compensation range at the surface pre-cladding position; pre-treatment before cladding; laser cladding the second cladding layer; and precision machining of the second cladding layer.

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