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Springback compensation method of thin-wall stamped part with large relative bending radius

A relative bending radius and springback compensation technology, which is applied in the field of sheet metal processing, can solve problems such as high requirements for experience proficiency, difficult to estimate development costs, and unguaranteed development cycle, so as to achieve low experience requirements, shorten development cycle, eliminate The effect of theoretical rebound

Inactive Publication Date: 2015-01-28
BEIJING HANGXING MACHINERY MFG CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For thin-walled stamping parts with large relative bending radius, if there are geometric features such as ribs on the part, there will be a large deviation in springback compensation through empirical formulas or data, and may require 2 to 3 follow-up mold repairs; at the same time , which requires high experience and proficiency of craftsmen, it is not easy to be widely used, and the development cost of the product is difficult to estimate, and the development cycle cannot be guaranteed

Method used

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  • Springback compensation method of thin-wall stamped part with large relative bending radius
  • Springback compensation method of thin-wall stamped part with large relative bending radius
  • Springback compensation method of thin-wall stamped part with large relative bending radius

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Experimental program
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Effect test

Embodiment 1

[0029] Large relative bending radius thin-walled stampings, such as figure 1 As shown, the material is 5052-O aluminum alloy, the wall thickness is 1.5mm, the bending radius is 12450mm, the chord length is 1500mm, the arch height is 22.6mm, the relative bending radius r / t is very large, and the dimensional accuracy of the parts requires the deviation of the arch height to be 3mm within. Using MSC.MARC 2005 finite element analysis software to analyze the springback of this stamping part, the results are as follows figure 2 with 3 shown. It can be seen from the figure that although the stamping parts use ribs to increase their rigidity, there is still a large springback after forming. The finite element analysis results show that the deviation has reached 10.1mm, which is seriously out of tolerance.

specific Embodiment approach

[0030] The specific embodiment is carried out according to the following process steps:

[0031] The first step, springback analysis of stamping parts: use MSC.MRAC finite element software to analyze the springback of thin-walled stamping parts with large relative bending radius, and obtain the data of the first mold (that is, the required size of the part) and the first springback after forming. bomb data, such as Figure 4 As shown, take the difference Aa as the first rebound compensation amount;

[0032] The second step, the first rebound compensation: as Figure 5 As shown, select a number of control points, and correct the mold so that the first modulus AB = Aa, and then use the finite element software to perform springback analysis to obtain the second springback, and compare the first mold and the second springback The difference Ab is used as the second rebound compensation amount;

[0033] The third step, the second springback compensation: On the basis of the seco...

Embodiment 2

[0036] On the basis of embodiment 1, the multi-point forming die is adopted, the finite element technique is combined with the multi-point forming technology, and after the third step of embodiment 1 is completed, the following steps are carried out:

[0037] 1) Import the forming surface: save the modified mold data obtained in the third step and theoretically meet the dimensional accuracy requirements in IGES format, and import it into the multi-point forming software to generate a 3D model; the multi-point forming software can directly identify Surface in IGES format;

[0038] 2) Check and generate the forming surface: Use the mouse or keyboard to rotate, translate or zoom the 3D model in real time to check and correct the surface of the 3D model. After the check is correct, the multi-point forming software automatically calculates and orders the multi-point forming mold to generate forming surface;

[0039] 3) Multi-point forming of slab: Place the slab of thin-walled sta...

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Abstract

The invention relates to a springback compensation method of a thin-wall stamped part with large relative bending radius. The springback compensation method comprises the following steps: analyzing the springback of the stamped part by adopting finite element software to obtain a first springback compensation; correcting a mould, and carrying out springback analysis to obtain a second springback compensation; correcting the mould again, and carrying out springback analysis to obtain a third springback compensation; carrying out comparison analysis and judging whether the size precision requirement is met or not; and if not meeting the size precision requirement, continuing the process till the size precision requirement is met. According to the springback compensation method disclosed by the invention, the size of the part subjected to springback is finally close to the size required by the part in theory by means of circulation proceeding of springback analysis, springback compensation and springback analysis, simulation mould repair and gradual approach, and then, the practical springback is reduced through experiments, so that the purpose of less mold repair, even no mold repair is achieved; the development period of a product is shortened, and the development cost is lowered. The springback compensation method belongs to the field of sheet metal working and is applicable to forming the thin-wall stamped part with relatively large relative bending radius.

Description

technical field [0001] The invention relates to a springback compensation method for thin-wall stamping parts, which is suitable for forming thin-wall stamping parts with relatively large bending radius. The invention belongs to the field of sheet metal processing. Background technique [0002] When the sheet is bent, due to the simultaneous existence of elastic deformation and plastic deformation, when the external load is removed, the elastic deformation partly recovers, and the size of the part after bending is not exactly the same as the size of the mold. This phenomenon is called springback. At present, there are three main measures to reduce springback. One is to perform springback compensation according to the calculation of springback value or empirical data; the other is to change the process plan so that springback can offset or reduce each other; rigidity. Among the above three measures to reduce springback, springback compensation is a commonly used measure. It...

Claims

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Application Information

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IPC IPC(8): B21D5/06B21D37/10
CPCB21D5/006B21D37/10
Inventor 秦中环李保永李信
Owner BEIJING HANGXING MACHINERY MFG CO LTD
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