阅读说明：本技术 一种滚压包边工艺参数优化方法及装置 (Method and device for optimizing rolling edge covering technological parameters ) 是由 华林 宋燕利 谢光驹 房宇飞 冯维 汪家喜 左洪洲 宁世儒 于 2019-08-30 设计创作，主要内容包括：本发明涉及汽车覆盖件滚压包边成形技术领域,公开了一种滚压包边工艺参数优化方法,包括以下步骤：建立冲压有限元模型,根据所述冲压有限元模型获取车门的冲压优化工艺参数；在所述冲压优化工艺参数的基础上,建立包括冲压和滚压包边的全工序有限元模型；选取不同的滚压包边实验工艺参数,对所述全工序有限元模型进行滚压包边模拟,选取模拟结果中无成形破裂缺陷、安全区域最大且起皱及压应力区域最小的滚压包边实验工艺参数作为滚压包边优化工艺参数。本发明具有滚压包边工艺参数精度高的技术效果,可以有效缩短现场工艺调试周期,降低试验成本,减少包边成形缺陷。(The invention relates to the technical field of rolling edge covering forming of automobile covering parts, and discloses a method for optimizing technological parameters of rolling edge covering, which comprises the following steps: establishing a stamping finite element model, and acquiring stamping optimization process parameters of the vehicle door according to the stamping finite element model; establishing a whole-process finite element model comprising stamping and rolling edge covering on the basis of the stamping optimization process parameters; selecting different rolling edge covering experiment process parameters, performing rolling edge covering simulation on the finite element model in the whole process, and selecting the rolling edge covering experiment process parameters which have no forming fracture defect, have the largest safe region and have the smallest wrinkling and compressive stress region in the simulation result as the rolling edge covering optimization process parameters. The invention has the technical effect of high precision of the rolling edge covering process parameters, can effectively shorten the debugging period of the on-site process, reduces the test cost and reduces the edge covering forming defects.)

1. A rolling edge covering process parameter optimization method is characterized by comprising the following steps:

Establishing a stamping finite element model, and acquiring stamping optimization process parameters of the vehicle door according to the stamping finite element model;

Establishing a whole-process finite element model comprising stamping and rolling edge covering on the basis of the stamping optimization process parameters;

Selecting different rolling edge covering experiment process parameters, performing rolling edge covering simulation on the finite element model in the whole process, and selecting the rolling edge covering experiment process parameters which have no forming fracture defect, have the largest safe region and have the smallest wrinkling and compressive stress region in the simulation result as the rolling edge covering optimization process parameters.

2. The roll hemming process parameter optimization method according to claim 1, wherein the step of obtaining the stamping optimization process parameters of the vehicle door according to the stamping finite element model comprises the following steps:

selecting different stamping experiment process parameters, carrying out stamping simulation on the stamping finite element model, and selecting the stamping experiment process parameters which have no forming fracture defect, have the largest safe region and have the smallest wrinkling and compressive stress region in the simulation result as the stamping optimization process parameters.

3. The roll hemming process parameter optimization method according to claim 2, wherein the stamping experiment process parameters include a holding time, a holding temperature, a stamping speed, a blank holding force, a holding time, a quenching rate, a friction coefficient and a thermal conductivity coefficient.

4. The method for optimizing parameters of a rolling hemming process according to claim 1, wherein a full process finite element model including stamping and rolling hemming is established on the basis of the stamping optimized process parameters, and specifically comprises the following steps:

And carrying out stamping simulation according to the stamping optimization process parameters to obtain stress-strain state information, and establishing the whole-process finite element model by taking the stress-strain state information as the initial state of the rolled edge covering.

5. The method according to claim 1, wherein different roll hemming experiment process parameters are selected to perform roll hemming simulation on the whole process finite element model, and the roll hemming experiment process parameters with no forming crack defect, the largest safe area and the smallest wrinkling area and compressive stress area in the simulation result are selected as the roll hemming optimization process parameters, specifically:

Setting rolling passes according to the vehicle door material, and setting the technological parameter ranges of rolling experiments in different passes;

Selecting a plurality of different rolling experiment process parameters within the range of the rolling experiment process parameters;

Rolling simulation is carried out on the finite element model in the whole procedure under each rolling experiment process parameter;

And selecting the technological parameters of the rolling experiment which have no forming fracture defect, the largest safe area and the smallest wrinkling and compressive stress area in the simulation result as the optimized technological parameters of the rolling edge covering.

6. the method for optimizing rolling hemming process parameters according to claim 5, wherein the rolling experiment process parameters include rolling times and rolling angle.

7. the method according to claim 5, wherein different roll hemming experiment process parameters are selected to perform roll hemming simulation on the whole process finite element model, and the roll hemming experiment process parameters with no forming crack defect, the largest safe area and the smallest wrinkling area and compressive stress area in the simulation result are selected as the roll hemming optimization process parameters, and the method further comprises:

setting a wrapping path according to the structure of the car door, dividing the wrapping path into different wrapping sections according to the structural shape characteristics of the wrapping path, and setting different wrapping experiment process parameter ranges for the different wrapping sections;

selecting different edge covering experiment process parameters for each edge covering section within the edge covering experiment process parameter range;

respectively carrying out edge wrapping simulation on the finite element model in the whole process under each edge wrapping experiment process parameter;

And selecting edge-covering experiment process parameters with no forming crack defect, the largest safe region and the smallest wrinkling and compressive stress region in the simulation result as the rolling edge-covering optimization process parameters.

8. the method for optimizing rolling hemming process parameters according to claim 7, wherein the hemming experimental process parameters include hemming speed and TCP-RTP distance.

9. the method for optimizing parameters of a rolling hemming process according to claim 1, wherein the simulation result includes a forming cloud graph and a forming limit graph.

10. a roll hemming process parameter optimizing device, comprising a processor and a memory, wherein the memory stores a computer program, and when the computer program is executed by the processor, the roll hemming process parameter optimizing device implements the roll hemming process parameter optimizing method according to any one of claims 1 to 9.

Technical Field

The invention relates to the technical field of rolling edge covering forming of automobile covering parts, in particular to a method and a device for optimizing technological parameters of rolling edge covering.

background

In actual production, roll hemming is usually performed after the door is stamped and formed, and the stress strain and other states of the stamped and formed door are mostly not considered when the roll hemming process design is carried out at present, so that the roll hemming process design is inaccurate. This is because, if the press forming effect is not taken into consideration, the roll-formed region has a uniform thickness, but the door is thinned after press forming, and the thinned region is likely to be broken during the roll hemming. In addition, the stamping forming of the car door plate, particularly the cold stamping of the high-strength plate, can generate non-negligible rebound, and can also have important influence on the precision after the rolling edge covering.

In addition, when the existing edge covering process is designed, the edge covering speed mostly adopts a constant speed, and the requirement difference of material types, structure forms and different passes on edge covering process parameters is not considered.

Disclosure of Invention

The invention aims to overcome the technical defects, provides a method and a device for optimizing rolling edge covering process parameters, and solves the technical problems that in the prior art, the design of the rolling edge covering process parameters does not consider the impact of stamping, so that the precision of the rolling edge covering process parameters is low, and the edge covering forming defects are caused.

in order to achieve the technical purpose, the technical scheme of the invention provides a method for optimizing rolling edge covering process parameters, which comprises the following steps:

Establishing a stamping finite element model, and acquiring stamping optimization process parameters of the vehicle door according to the stamping finite element model;

Establishing a whole-process finite element model comprising stamping and rolling edge covering on the basis of the stamping optimization process parameters;

Selecting different rolling edge covering experiment process parameters, performing rolling edge covering simulation on the finite element model in the whole process, and selecting the rolling edge covering experiment process parameters which have no forming fracture defect, have the largest safe region and have the smallest wrinkling and compressive stress region in the simulation result as the rolling edge covering optimization process parameters.

the invention also provides a device for optimizing the parameters of the rolling edge covering process, which comprises a processor and a memory, wherein the memory is stored with a computer program, and the computer program is executed by the processor to realize the method for optimizing the parameters of the rolling edge covering process.

Compared with the prior art, the invention has the beneficial effects that: the invention provides a method for designing the rolling edge-covering process parameters, which considers the influence of stress strain generated by stamping, establishes a whole-process finite element model on the basis of stamping optimization process parameters, enables the whole-process finite element model to automatically inherit the influence of the stamping process of a vehicle door, and selects the rolling edge-covering experiment process parameters without forming crack defects, with the largest safe area and the smallest wrinkling and pressure stress area through finite element simulation under different rolling edge-covering experiment process parameters so as to achieve the aim of accurately designing the rolling edge-covering process parameters.

Drawings

FIG. 1 is a flow chart of an embodiment of a method for optimizing parameters of a rolling edge covering process provided by the invention;

FIG. 2 is a schematic view of an embodiment of a press forming of an outer panel of a door;

FIG. 3 is a schematic view of an embodiment of a door outer panel roll hemming;

FIG. 4 is a schematic view of an embodiment of a flat straight hemming structure;

FIG. 5 is a schematic view of an embodiment of a flat arc-shaped hemming structure;

FIG. 6 is a schematic view of an embodiment of a hem structure that is not flat and straight;

FIG. 7 is a schematic view of an embodiment of a corner hemming structure.

Detailed Description

in order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.