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A method for regulating friction coefficient between steel plate and die to reduce cold forming springback

A friction coefficient and cold forming technology, applied in the field of cold stamping, can solve the problems of reduced production efficiency and increased production cost, and achieve the effect of reducing friction coefficient and reducing friction coefficient optimization experimental work.

Pending Publication Date: 2019-02-12
NANJING INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When updating the plate material, due to the difference in mechanical properties, it is usually necessary to redesign the mold to reduce springback, which not only increases the production cost, but also reduces the production efficiency

Method used

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  • A method for regulating friction coefficient between steel plate and die to reduce cold forming springback
  • A method for regulating friction coefficient between steel plate and die to reduce cold forming springback
  • A method for regulating friction coefficient between steel plate and die to reduce cold forming springback

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Taking the processing of curved U-shaped parts as an example, first select Q235(σ s is 235MPa, σ b is 380MPa, T is 4100MPa), Q345(σ s is 345MPa, σ b is 500MPa, T is 4200MPa) and Q460 (σ s is 460MPa, σ b It is 600MPa, T is 4200MPa) for cold stamping, and it is planned to use SPFH590 as the new steel plate material.

[0028] When the coefficient of friction is 0.08 and 0.1, the rebound angle of the U-shaped piece at a bending angle of 90° is measured, as shown in Table 1.

[0029] Table 1 Under different friction coefficients, the springback angle of U-shaped parts at a bending angle of 90°

[0030]

[0031] Based on the experimental results in Table 1, A is -0.954, B is 0.00196, C is -0.00016, D is 0.000278, E is -0.00264, and F is -0.00264. That is, for the U-shaped part of this shape, Δα and μ satisfy the following relationship

[0032] Δα=(-0.954+0.00196σ s +-0.00016σ b +0.000278T+(-0.00264σ b

[0033] +-0.00264)μ)α

[0034] For the SPFH590 plate, the e...

Embodiment 2

[0038] Taking the cold forming at the bending angle of 45° in the anti-collision beam of an automobile as an example, 20 steel (σ s 245MP a , σ b is 310MPa, T is 2000MPa), 35 steel (σ s is 315MPa, σ b is 530MPa, T is 2000MPa) and 45 steel (σ s is 355MPa, σ b It is 600MPa, T is 2100MPa) for cold stamping, and it is planned to use SZB600 as the new steel plate material.

[0039] When measuring different friction coefficients, the springback angle of the part at a bending angle of 45° is shown in Table 3.

[0040] Table 3 Cold forming under different friction coefficients, the springback angle at the bending angle of 45° in the automobile anti-collision beam

[0041]

[0042] Based on the experimental results in Table 3, A is -1.01, B is -0.00291, C is 0.001, D is 0.000758, E is -0.000252, and F is -0.255 calculated by the least square method. That is, for the specimen of this shape, Δα and μ satisfy the following relationship

[0043] Aα=(-1.01+-0.00291σ s +0.001σ b...

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Abstract

The invention relates to a method for regulating friction coefficient between steel plate and die to reduce cold forming springback, includes the following steps of: establishing the relational expression among the yield strength of a springback angle and the steel plate, the tensile strength of the steel plate, the tangential modulus of the steel plate, the bending angle of the steel plate and afriction coefficient between the steel plate and a die, wherein in the relational expression, sigma s is the yield strength of the steel plate; sigma b is the tensile strength; T is the tangent modulus; alpha is the bending angle of a formed workpiece; A, B, C, D, E and F are constants; solving the values of A, B, C, D, E and F by a substitution method. The method of the invention can determine the matching friction coefficient required to reach the target springback amount when the steel plate to be adopted is used for the cold forming, simply and quickly.

Description

technical field [0001] The invention relates to a method for adjusting and controlling the friction coefficient between a steel plate and a mold to reduce springback in cold forming, and belongs to the technical field of cold stamping. Background technique [0002] With the development of science and technology and performance requirements, the steel plate materials used for cold stamping parts are in the process of continuous development and renewal. During the cold stamping forming process of sheet metal, parts usually spring back, which directly affects the quality and output of products, and will significantly reduce the production efficiency of enterprises. The conventional solution is to increase the shaping process and redesign the mold, and the mold design is closely related to the mechanical properties of the sheet used. When updating the plate material, due to the difference in mechanical properties, it is usually necessary to redesign the mold to reduce the sprin...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F17/50
CPCG06F30/17G06F30/23
Inventor 李旋许正华黄钟森李华冠巨佳吕学鹏
Owner NANJING INST OF TECH
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