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Calculation method of variable blank holder force for forming and drawing die using the method

A technology of variable blank holder force and calculation method, applied in the field of stamping dies, can solve the problems of high cost, inconvenient installation, unfavorable promotion and use, etc., and achieve the effect of improving formability

Active Publication Date: 2017-06-06
HUNAN UNIV
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  • Abstract
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The existing drawing dies with adjustable blank holder force have defects such as complex structure, inconvenient installation, high cost, and unfavorable promotion and use.

Method used

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  • Calculation method of variable blank holder force for forming and drawing die using the method
  • Calculation method of variable blank holder force for forming and drawing die using the method
  • Calculation method of variable blank holder force for forming and drawing die using the method

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Embodiment Construction

[0026] The following will be combined with Figure 1-9 The technical solution of the present invention is described in detail.

[0027] Such as Figure 5 As shown, the present invention provides a kind of variable blank-holding force calculation method that is beneficial to formability, and it specifically comprises the following steps:

[0028] Step 1. Establish the supplementary surface of the initial drawing process of the part;

[0029] Such as figure 1 As shown, the drawing surface is also called the binder surface, in order to prevent deformation of the blank. In many parts, such as the engine cover, the drawing surface is all process supplementary surface. In the drawing die design process, the first step is to design a reasonable supplementary surface for the drawing process, which mainly includes the design of the drawing surface and the trimming surface. In the drawing forming process of automobile panels, the design of the supplementary surface of the drawing pr...

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Abstract

The present invention relates to a variable blank holder force calculation method that is beneficial to formability, which specifically includes the following steps: Step 1, establishing the supplementary surface of the initial drawing process of the part; Step 2, performing stamping finite element simulation analysis on the part; Step 3, when The simulation results determine the wrinkling area and the cracking area; step 4, for the wrinkling area W, move the blank holder (2) of the wrinkling area W to the +Z direction by the adjustment amount δ, and for the cracking area C, move the The blank holder (2) is moved in the -Z direction by an adjustment amount δ', step 5, using the adjusted profile of the blank holder (2), and performing stamping finite element simulation analysis again until an ideal forming result is obtained. In the present invention, the adjustment of the blank-holding force is graded by formulating gaskets with different thickness specifications, that is, large adjustment range or fine adjustment. Moreover, the blank holder force adjusting mechanism has the advantages of simple structure, low manufacturing difficulty, convenient installation and operation, low processing cost, good adjustment effect, and can be popularized and used in a wide range.

Description

technical field [0001] The invention relates to stamping die technology, in particular to a calculation method for variable blank-holding force of a stamping drawing die which is beneficial to forming and a drawing die which realizes local adjustment of blank-holding force. Background technique [0002] Sheet metal stamping is the manufacturing process for most parts of the automobile body, and the drawing process is one of the most difficult and important processes in the stamping process, especially for sheet metal parts with complex shapes. Requirements, the quality of parts in the subsequent process is basically guaranteed. [0003] The traditional drawing die structure is composed of three main parts: die, punch and blank holder. The inflow speed of the material is controlled by the clamping force between the blank holder ring and the die, that is, the blank holder force. If the material inflow in the area with a large drawing depth can be made to flow quickly, and the...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B21D37/10G06F17/50
Inventor 聂昕申丹凤
Owner HUNAN UNIV
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