Method and device for confirming effect of backlash countermeasures for press-formed products

Abstract

The present invention provides a method and device for confirming the effects of backlash countermeasures on press-formed products, which can easily and clearly confirm the effects of backlash countermeasures during press forming. The method for confirming the effect of backlash countermeasures according to the present invention is characterized in that the residual stress distribution of the molded object before parting is calculated using preset molding conditions, and the residual stress distribution of the molded object after parting is calculated based on the result. , Calculate the difference of residual stress distribution based on these results, similarly obtain the difference of residual stress distribution with changed forming conditions, and obtain the residual stress caused by the change of forming conditions according to the results of the difference of these residual stress distributions The amount of change in the distribution, and display it in a cloud map.

Description

technical field [0001] The present invention relates to, for example, techniques for reducing backlash in press forming of vehicle body structural materials constituting a vehicle body, and more particularly, to a method and apparatus for confirming the effect of changing forming conditions for reducing backlash. Background technique [0002] In press forming, after the press-formed product is taken out from the die (after parting), the press-formed product recoils (elastically recovers), and a problem that the desired shape often occurs. The cause of backlash is known to be non-uniform residual stress distribution of the product before parting, and conventionally, numerical analysis methods such as the finite element method have been used to predict it. [0003] Especially recently, in order to reduce development man-hours and costs, there is a tendency to start the design stage of studying the forming method of molded parts at the same time as the design stage of automobil...

AI Technical Summary

Problems solved by technology

[0010] However, even if it is found that changing the distribution of residual stress before parting in a specific region is effective in reducing backlash, the problem of how to change the molding conditions for changing the distribution of residual stress in this region remains.

[0011] In summary, since there is no means to clearly grasp the relationship between the change of the molding conditions as a countermeasure against backlash and the change of the stress state in the overall shape of the molded product before and after parting, it is impossible to properly evaluate the The effect of changing the molding conditions as a countermeasure to reduce backlash

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