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A New Method of Straightening Technology for Bimetal Composite Plate
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A composite plate and new method technology, applied in the field of roller straightening, can solve the problems of reducing the accuracy of the straightening force model, low straightening precision, and unfavorable composite plate quality, so as to improve the straightening accuracy and product quality, and improve the straightening accuracy. Straightforward and precise effect
Active Publication Date: 2020-06-26
TAIYUAN UNIVERSITY OF SCIENCE AND TECHNOLOGY
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However, in the actual simulation calculation and processing process, the influence of the neutral layer offset of different straightening units in the composite plate on the straightening force of the composite plate is often ignored due to the different reduction amount, the stress-strain state of each straightening unit is different , which in turn reduces the accuracy of the straightening force model, resulting in low straightening accuracy, which is not conducive to improving the quality of the composite plate
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Embodiment 1
[0064] Such as figure 1 As shown, in order to describe the present invention more clearly, the neutral layer offset of a single material metal plate is first analyzed
[0065] Assume that the upper part of the metal plate of a single material is subjected to straightening force, that is, the force is exerted along the negative direction of the Z axis, and BC is the central axis of the plate;
[0066] According to the knowledge of material mechanics, the Mises plastic equivalent stress formula is:
[0067]
[0068] σ x , σ y , σ z , τ xy , τ yz , τ zx - the six-axis stress component of the material,
[0069] k - the shear yield strength of the material;
[0073]In general plane strain problems, take σ 1 >σ 2 >σ 3 ; From the incremental theory:
[0074]
[0075...
Embodiment 2
[0156] In order to verify this method, a bimetal composite plate with S304 stainless steel as the cladding layer and Q235 carbon steel as the base layer is selected as the straightening material, and the 11-roll straightening machine in the laboratory is used as the straightening machine model. The thickness of straightening piece is 6mm, the ratio of multi-layer base layer is 1:5, and the width is 50mm. The yield strength of S304 stainless steel is 205MPa, the elastic modulus is 200GPa, and Poisson's ratio is 0.247; the yield strength of Q235 stainless steel is 235MPa, the elastic modulus is 210GPa, and Poisson's ratio is 0.3. The bending amount at the inlet and outlet of the straightening machine is -2.5mm / -0.5mm. The measured straightening force is 10.93KN, the theoretically calculated straightening force is 11.47KN, and the error is 4.94%.
[0157] The process is as follows:
[0158] (1) According to the product specification, use the formula (1) to obtain the offset e w...
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Abstract
The invention provides a new straightening process method of a double-metalcomposite plate. The method comprises the following steps that a large-deformation straightening process method is adopted,and during the large-deformation straightening process, the composite plate gains three different stress-strain states after entering a straightening roll to be straightened, wherein the correspondingstress-strain states comprise the following three steps: early-stage straightening force calculating, middle-stage straightening force calculating and later-stage straightening force calculating. According to the new straightening process method of the double-metalcomposite plate, by following different stress-strain states of the double-metal composite plate during straightening process and taking into account of the influence of neutral layer offset on the straightening accuracy, a more precise straightening force model is establish, thus improving the straightening precision and product quality.
Description
technical field [0001] The invention belongs to the technical field of roller straightening, and in particular relates to a new method for straightening a bimetal composite board. Background technique [0002] Bimetal composite panels have been widely used in traditional industries and high-tech fields. Compared with single metal materials, bimetal composite panels have the advantages of excellent composite properties of two metal materials and lower production costs. The accuracy of the straightening force model in the straightening process of bimetallic clad plate determines the quality of the straightening effect and the quality of the clad plate. However, in the actual simulation calculation and processing process, the influence of the neutral layer offset of different straightening units in the composite plate on the straightening force of the composite plate is often ignored due to the different reduction amount, the stress-strain state of each straightening unit is d...
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Patent Type & Authority Patents(China)
IPC IPC(8): B21D1/02
CPCB21D1/02
Inventor 桂海莲邢彤王亚东李玉贵
Owner TAIYUAN UNIVERSITY OF SCIENCE AND TECHNOLOGY
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