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Method for determining bending angle of each pass of cold roll forming of plate and strip

A technology of bending angle and cold-bending forming, which is applied in the field of determining the bending angle of each pass of cold-bending forming of plates and strips. It can solve the edge wave shape, failure to consider the influence of plate and strip deformation, and plate and strip warping, etc. question

Inactive Publication Date: 2013-11-20
WUHAN UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] However, when the stand spacing is not equal, the above method cannot directly derive the distribution relationship of the bending angle of each pass; moreover, this method fails to consider the equipment such as roll diameter, plate and strip material, rolling piece / roll contact state, etc. and the influence of process parameters on the deformation of the strip; in addition, the determination of the total number of passes still depends on actual experience. If the value is large, the capacity of the unit cannot be fully utilized; if the value is small, strips will be produced. Defects of material warpage and edge wave shape

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  • Method for determining bending angle of each pass of cold roll forming of plate and strip
  • Method for determining bending angle of each pass of cold roll forming of plate and strip
  • Method for determining bending angle of each pass of cold roll forming of plate and strip

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Embodiment 1

[0058] A method for determining the bending angle of each pass of cold-bending forming of a plate and strip. The concrete steps of this method are:

[0059] The first step, the design of the virtual test plan

[0060] According to the shape factor function, set the number of cold-bending passes n of the asymmetric Z-shaped steel to 11, and complete as follows figure 1 The design of the roller flower diagram is shown. This step takes the 7th pass as an example, select the first bending angle β of the 7th pass 7 , the second bending angle γ 7 and roll work roll diameter D 7 As a test factor; each test factor takes three horizontal values, that is, the first bending angle β 7 The values ​​are 16°, 23° and 30° respectively, the second bending angle γ 7 The values ​​are 6°, 12° and 18° respectively, and the working roll diameter of the roll is D 7 The values ​​are 320mm, 400mm and 480mm respectively; according to the orthogonal table L 9 (3 4 ) to determine the virtual tes...

Embodiment 2

[0122] A method for determining the bending angle of each pass of cold-bending forming of a plate and strip. The specific steps of the method are: the first step, the design of the virtual test program

[0123] According to the production experience, it is preliminarily determined that the number n of cold bending passes of the asymmetric Z-shaped steel is 12, and the design of the roll pattern is completed accordingly. In this step, take the 6th pass as an example, select the first bending angle β of the 6th pass 6 , the second bending angle γ 6 and roll work roll diameter D 6 As a test factor; each test factor takes three horizontal values, that is, the first bending angle β 6 The values ​​are 16°, 21° and 26° respectively, the second bending angle γ 6 6°, 11° and 16° respectively, the working roll diameter of the roll is D 6 320mm, 380mm and 440mm respectively; according to the orthogonal table L 9 (3 4 ) to determine the virtual test plan for each test factor and co...

Embodiment 3

[0187] A method for determining the bending angle of each pass of cold-bending forming of a plate and strip. The concrete steps of this method are:

[0188] The first step, the design of the virtual test plan

[0189] According to the shape factor function, the number n of cold bending passes of the asymmetric Z-shaped steel is set to 10, and the design of the roll pattern is completed accordingly. Select the bending angle of the plate and strip of each pass and the diameter of the work roll of the roll as the test factors, and pre-select the level values ​​of each test factor. In this step, the third pass is taken as an example, and the first bending angle β is selected. 3 and roll work roll diameter D 3 is the test factor; each test factor takes three horizontal values, that is, the first bending angle β 3 16°, 22° and 28° respectively, the working roll diameter of the roll is D 3 400mm, 450mm and 500mm respectively; according to the orthogonal table L 9 (3 4 ) to dete...

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Abstract

The invention relates to a method for determining a bending angle of each pass of cold roll forming of a plate and strip. According to the technical scheme of the method for determining the bending angle of each pass of the cold roll forming of the plate and strip, the number of passes of cold roll forming is set at first, the bending angle of each pass and the working roller diameter of a roller are selected as experimental factors, an average value of all the experimental factors is selected in advance, and a virtual experimental scheme of each experimental factor and each corresponding average value is designed; the strain distribution of the plate and strip of each virtual experimental scheme is calculated, a mathematical model of the maximum value of a positive strain absolute value of the outer edge of each pass of the plate and strip in the tangential direction is built up; based on the constraint condition that the maximum value of the positive strain absolute value of each pass is smaller than or equal to 1% and the constraint conditions of the top and bottom limitation of the average value of each experimental factor, the pursuit target is the minimum of the maximum value of the positive strain absolute value of each pass, and the number of passes of cold roll forming, the bending angle of each pass of the cold roll forming of the plate and strip and the working roller diameter of the roller are optimized and determined. The method for determining the bending angle of each pass of the cold roll forming of the plate and strip has the advantages of giving full play to the capacity of cold roll unit equipment, avoiding warping of the plate and strip, and being capable of overcoming the shape wave of edges of the plate and strip.

Description

technical field [0001] The invention belongs to the technical field of cold-bending forming of plates and strips, and in particular relates to a method for determining the bending angle of each pass of cold-bending forming of plates and strips. Background technique [0002] Cold roll forming is a process technology that continuously bends metal sheet strips transversely through sequentially configured multi-pass forming rolls to make specific cross-section profiles. Cold roll forming is a material-saving, energy-saving, high-efficiency, advanced and applicable metal forming process, and it is an important field of deep processing of plates and strips. [0003] The cold-bending deformation process of plate and strip has obvious geometric nonlinearity, physical nonlinearity and boundary nonlinearity. Therefore, so far, cold-bending technology is still mainly based on the experience and knowledge of engineers and technicians, relying on trial and error to obtain process rules,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B21D5/14
Inventor 李立新叶奔曾祥明朱少文周绪昌胡盛德李烨
Owner WUHAN UNIV OF SCI & TECH
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