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A hybrid drawbead structure determination method based on fully open drawing die surface for complex U-shaped parts

A technology for drawing dies and determining methods, applied in forming tools, manufacturing tools, metal processing equipment, etc., can solve the problems of twisting springback, inability to effectively control the unevenness of complex U-shaped parts materials, etc., to prevent wrinkling, The effect of reduced computational complexity and enhanced timeliness

Inactive Publication Date: 2015-12-09
HEFEI UNIV OF TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] The purpose of the present invention is to solve the problem that existing drawbead design methods cannot effectively control the inhomogeneity of material deformation of various parts of complex U-shaped parts, resulting in quality defects such as wrinkling, cracking, twisting and springback during the forming process of complex U-shaped parts To solve the problem, a method for determining the hybrid drawbead structure based on the fully open drawing die surface of complex U-shaped parts is provided; the present invention uses the detected optimal drawing resistance distribution to set the corresponding drawbead, Especially suitable for the design of the drawbead structure of the fully open drawing die for sheet metal drawing

Method used

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  • A hybrid drawbead structure determination method based on fully open drawing die surface for complex U-shaped parts
  • A hybrid drawbead structure determination method based on fully open drawing die surface for complex U-shaped parts
  • A hybrid drawbead structure determination method based on fully open drawing die surface for complex U-shaped parts

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Embodiment 1

[0042] In conjunction with the accompanying drawings, a method for determining a hybrid drawbead structure based on a fully open drawing die surface of a complex U-shaped part in this embodiment, the steps are:

[0043] Step 1. Determine the distance from the centerline of the drawbead to the opening line of the drawing die, and set the centerline of the drawbead.

[0044]Based on the CAE analysis software, within the range of 20-30mm from the drawing die opening line, find the best position to set the drawbead center line. In this embodiment, the mold opening line is offset by 25mm along the binder surface, and then It is projected onto the binder surface by means of projection, and finally the equivalent centerline of the drawbead is generated under the Dynaform software. It is worth noting that this embodiment limits the setting range of the centerline of the drawbead to 20-30 mm, which is concluded by the inventor on the basis of a large number of experiments. Setting the ...

Embodiment 2

[0075] A hybrid drawbead structure determination method based on the fully open drawing die surface of complex U-shaped parts in this embodiment is basically the same as in Embodiment 1, the difference is that in step 1 of this embodiment, the mold is opened The mold line is offset 20mm along the binder surface to set the drawbead center line; in step 2, use the dichotomy method to conduct 10 simulated forming tests to determine the optimal blank holder force when there is no cracking; in step 3, set the drawbead The initial resistance value is 400N / mm, and 15 simulated forming tests are carried out using the dichotomy method to determine the corresponding drawing resistance value of each drawbead section when there is no cracking or wrinkling.

Embodiment 3

[0077] A hybrid drawbead structure determination method based on the fully open drawing die surface of complex U-shaped parts in this embodiment is basically the same as in Embodiment 1, the difference is that in step 1 of this embodiment, the mold is opened The mold line is offset 30mm along the binder surface to set the drawbead center line; in step 2, use the dichotomy method to conduct 15 simulated forming tests to determine the optimal blank holder force when there is no cracking; in step 3, set the drawbead The initial resistance value is 300N / mm, and 10 simulated forming tests are carried out by using the dichotomy method to determine the corresponding drawing resistance value of each drawbead section when there is no cracking or wrinkling.

[0078] A method for determining the hybrid drawbead structure based on the fully open drawing die surface of complex U-shaped parts described in Examples 1 to 3, setting the mixed-type drawing bead structure for the feeding resistan...

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Abstract

The invention discloses a hybrid draw bead structure determining method based on the profile of a totally open drawing die for complex U-type pieces and belongs to the technical field of drawing forming. The method includes the steps that first, the distance of a draw bead center line deviating from a die opening line of the drawing die is determined, and the draw bead center line is set; second, the draw bead center line is segmented according to the structure distribution rule of all parts in the complex U-type piece forming process; third, the optimum drawing resistance of all the draw bead segments obtained in the second step is acquired; fourth, according to the drawing resistance distribution situation obtained in the third step, draw bead structures corresponding to all the draw bead segments are reversely engineered. When the method is applied to the complex U-type piece open drawing die with large forming depth and big section changes, feeding resistance required by all the parts in the forming process can be provided quite effectively, and thus the forming defects can be effectively overcome, the stamping springback phenomenon is controlled, and the forming quality of final products is guaranteed.

Description

technical field [0001] The invention relates to the technical field of drawing forming, and more specifically, relates to a method for determining a hybrid drawbead structure based on a fully open drawing die surface of a complex U-shaped piece. Background technique [0002] Drawing is an important method for stamping and forming of automotive panels, and wrinkling and cracking are common defects in the drawing process. In the field of fully open drawing dies for complex U-shaped parts, such as some fully open dies for automobile body U-shaped parts, the forming depth and section width vary greatly, and most of them are composed of complex free-form surfaces in the air. The deformation and feed resistance of each part of the material are uneven, resulting in product quality defects such as wrinkling, cracking, twisting and springback, especially after the use of high-strength steel materials, the forming defects are more serious. [0003] In order to eliminate the above-men...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B21D22/20B21D37/10
Inventor 赵韩张祖芳李路李军王晓枫
Owner HEFEI UNIV OF TECH