EP-4064103-B1 - METHOD FOR IMPROVING A FORMING RATE OF A VEHICLE-BODY STAMPED PART

EP4064103B1EP 4064103 B1EP4064103 B1EP 4064103B1EP-4064103-B1

Inventors

RAO, Hui
WU, JIANYONG
WU, Yanlin
LIU, BING

Dates

Publication Date: 20260506
Application Date: 20220322

Claims (9)

A method for improving a forming rate of a vehicle-body stamped part made of aluminium plates, wherein the method comprises: scanning (S110) the stamped part to obtain point cloud data; constructing (S120) a three-dimensional model based on the point cloud data; comparing (S130) the three-dimensional model with an original design model of the stamped part in a same three-dimensional coordinate system to obtain thinned portions with thinning rates exceeding the standard rate on the stamped part; inspecting (S200) the stamped part to screen a first portion with a defect rate and/or a defect type not meeting a preset requirement from the thinned portions; and adjusting (S300) a shape, a size, and/or a material of a second portion that is the same as the first portion on the original design model of the stamped part to obtain a target design model; manufacturing stamped parts using the target design model.
The method according to claim 1, wherein the step of "scanning the stamped part to obtain point cloud data" comprises: scanning (S110) the stamped part placed on a gauge platform to obtain the point cloud data.
The method according to claim 1, wherein the step of "adjusting a shape, a size, and/or a material of a second portion that is the same as the first portion on an original design model of the stamped part to obtain a target design model" comprises: adjusting (S310) the shape and the size of the second portion on the original design model to obtain an adjusted model; performing (S340) a simulation analysis on the adjusted model to determine whether a probability of occurrence of a defect in a third portion that is the same as the second portion on the adjusted model is less than a first preset value; and if the probability of occurrence of the defect in the third portion is less than the first preset value, using (S350; S360) the adjusted model as the target design model.
The method according to claim 3, characterized in that the step of "adjusting a shape, a size, and/or a material of a second portion that is the same as the first portion on an original design model of the stamped part to obtain a target design model" further comprises: if the probability of occurrence of the defect in the third portion is not less than the first preset value, using (S350; S370) the original design model as the target design model after a material of the second portion on the original design model has been adjusted to a material with a higher forming performance index.
The method according to claim 3, wherein the step of "adjusting the shape and the size of the second portion on the original design model to obtain an adjusted model" comprises: after the shape and the size of the second portion on the original design model are adjusted, determining (S320) whether there is an interference between the adjusted model and a part that fits into the adjusted model; and if there is no interference, using (S330), as the adjusted model, a model obtained after the shape and the size of the second portion on the original design model have been adjusted.
The method according to claim 5, wherein if there is an interference, using (S370) the original design model as the target design model after a material of the second portion on the original design model has been adjusted to a material with a higher forming performance index.
The method according to any one of claims 1 to 6, wherein the step of "adjusting a shape and a size of the second portion" comprises: adjusting a draft angle and/or a fillet size of the second portion.
The method according to any one of claims 1 to 6, wherein the defect rate comprises a crack scrap rate.
The method according to claim 1, wherein the step of "scanning the stamped part to obtain point cloud data" comprises: scanning the stamped part by using a stereo camera system to obtain the point cloud data.

Description

Technical Field The invention relates to the technical field of vehicle design, and specifically provides a method for improving a forming rate of a vehicle-body stamped part made of aluminium plates. Background Art With the continuous improvement of people's living standards, private vehicles have become a main means of transport for consumers. The purchase of vehicles is included by more and more vehicle-free families in their short-term plans, and many vehicle-owned families also plan to add new vehicles to cater to the needs of family members. With the continuous expansion of the family vehicle market and the booming prospects, more and more vehicle manufacturers have sprung up, and the market competition has become more and more fierce, the fierce competition environment puts forward higher requirements on the speed of research and development of various vehicle manufacturers. In the process of research and development, the design of a unique vehicle body usually requires a lot of time, manpower, material resources, and financial resources. In order to speed up the progress of research and development and reduce the costs of research and development and manufacturing, usually further modifications are made to a new type of vehicle body design, and then upgraded vehicle body styling is launched. Specifically, the partial styling of a previous version of vehicle body is modified in the direction of the new design concept to obtain the upgraded vehicle body styling. However, in a manufacturing phase, a relatively large quantity of defects may emerge in the stamped part that constitutes the vehicle body in a mass production phase, and the stamped part has a high scrap rate, which increases the manufacturing costs. Under the trend of high-end vehicles pursuing lightweight, all-aluminum vehicle bodies have become one of the main choices, and the forming difficulty of aluminum plates is higher than that of steel plates, and the defects and scrapping of aluminum plate stamping are more prominent. Thus, there is a need for a new technical solution in the art to solve the above problems. Sheet-metal forming optimisation methods are known in the art. For example, Mole et al., Journal of Materials Processing Technology 214 (2014), doi: 10.1016/ j.jmatprotec.2014.03.017, discloses an iterative forming optimisation method based on computer simulation, in which the geometry of a simulated formed part is compared with a reference geometry and the die and/or punch geometry is corrected when deviations exceed a prescribed tolerance, taking into account forming-related effects such as springback and sheet thinning. Summary of the Invention The invention is defined by claim 1, with preferred embodiments specified in the dependent claims. In a preferred technical solution of the above method, the step of "scanning the stamped part to obtain point cloud data" includes: scanning the stamped part placed on a gauge platform to obtain the point cloud data. In a preferred technical solution of the above method, the step of "adjusting a shape, a size, and/or a material of a second portion that is the same as the first portion on an original design model of the stamped part to obtain a target design model" includes: adjusting the shape and the size of the second portion on the original design model to obtain an adjusted model; performing a simulation analysis on the adjusted model to determine whether a probability of occurrence of a defect in a third portion that is the same as the second portion on the adjusted model is less than a first preset value; and if the probability of occurrence of the defect in the third portion is less than the first preset value, using the adjusted model as the target design model. In a preferred technical solution of the above method, the step of "adjusting a shape, a size, and/or a material of a second portion that is the same as the first portion on an original design model of the stamped part to obtain a target design model" further includes: if the probability of occurrence of the defect in the third portion is not less than the first preset value, using the original design model as the target design model after a material of the second portion on the original design model has been adjusted to a material with a higher forming performance index. In a preferred technical solution of the above method, the step of "adjusting the shape and the size of the second portion on the original design model to obtain an adjusted model" includes: after the shape and the size of the second portion on the original design model are adjusted, determining whether there is an interference between the adjusted model and a part that fits into the adjusted model; and if there is no interference, using, as the adjusted model, a model obtained after the shape and the size of the second portion on the original design model have been adjusted. In a preferred technical solution of the above method, if there is an interferen