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Method for calculating offset of neutral layer in thick plate bending forming process

A bending forming and calculation method technology, applied in design optimization/simulation, special data processing applications, instruments, etc., can solve problems such as shallow understanding of deformation and insufficient theoretical analysis, and achieve the effect of improving forming accuracy and reducing production costs

Pending Publication Date: 2022-03-01
TAIYUAN UNIVERSITY OF SCIENCE AND TECHNOLOGY
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Problems solved by technology

Moreover, the understanding of the complex deformation in the production process of welded pipes is relatively shallow, the theoretical analysis is relatively insufficient, and there are still many problems in production

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  • Method for calculating offset of neutral layer in thick plate bending forming process
  • Method for calculating offset of neutral layer in thick plate bending forming process

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Effect test

Embodiment 1

[0044] Take JCO forming of thick plate as an example:

[0045] Such as Figure 1-2 As shown, a calculation method for the neutral layer offset in the thick plate JCO forming process includes the following steps:

[0046] Step 1: Obtain the linear distribution curve of the thickness strength by using the layered tensile fracture experiment, and establish the stress-strain mathematical model according to the thick plate bending theory:

[0047] (1)

[0048] K--hardening coefficient,

[0049] n--hardening index,

[0050] Q--a coefficient reflecting the degree of inhomogeneity in the thickness distribution of strength,

[0051] z--the vertical distance between the board layer and the middle layer,

[0052] e--Theoretical neutral layer offset,

[0053] t - the thickness of the thick plate,

[0054] E - modulus of elasticity;

[0055] Step 2: Take micro-elements in the tension zone and compression zone respectively for force balance analysis, and obtain the neutral layer ...

Embodiment 2

[0075] In order to verify the present invention, the thick plate material is selected as nickel-based alloy as an example.

[0076] The basic parameters of the thick plate are: the width of the thick plate W =1000 mm , the length of the slab L =2000 mm , the thickness of the slab t =60 mm , Young's modulus E =205GPa, Poisson's ratio is 0.3, density is 7.82 g / cm 3 . The radius of curvature of the upper mold is 150 mm , the radius of curvature of the lower die is 150 mm , the span of the lower die is 770 mm . The upper and lower dies are set as rigid bodies. Its reduction is set to 30 mm .

[0077] From the strain cloud diagram in the simulation results, select the node between the two unit bodies in the middle of the thick plate, and obtain by measurement: the elastic height of the tensile zone of the model when the reduction is 30mm y 1 for 2.10 mm , the elastic height in the compression zone y 2 is 7.47mm, the simulated neutral layer offset can be...

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Abstract

The invention discloses a method for calculating the offset of a neutral layer in the bending forming process of a thick plate, and the bending forming process of the thick plate is complex and changeable and comprises nonlinearity of an elastoplastic material, geometric nonlinearity of large deflection and the like and the change condition of stress and strain in the deformation process. At present, the factor of deviation of a neutral layer is not considered in bending forming of a thick plate, and the factor is that the deviation of the neutral layer cannot be accurately given, so that the bending forming quality is poor. In order to improve the bending forming quality, reduce the production cost and improve the productivity, the invention provides a method for calculating the offset of a neutral layer in the bending forming process of a thick plate. A thickness-direction strengthening linear distribution curve is obtained through experimental measurement, then according to an elastic-plastic mechanics theory and a medium-thickness plate bending theory, a limit state is discussed by taking a differential unit body for mechanical analysis when a thick plate is bent, and a calculation formula of theoretical neutral layer deviation is deduced.

Description

technical field [0001] The invention belongs to the technical field of bending forming, and in particular relates to a new calculation method for considering neutral layer offset in the bending forming process of a thick plate. Background technique [0002] Thick plate metal bending forming is an important deformation process for preparing thick-walled longitudinal seam welded pipes. For example, UOE, JCOE, RBE and other forming methods, thick plate metal bending forming is a key research part of the forming process. However, the control of the bending forming method in the forming process is relatively rough, which has a certain impact on production efficiency, steel pipe welding and appearance quality. In the actual production process, more still rely on experience for mold design and process parameter adjustment. Moreover, the understanding of complex deformation in the production process of welded pipes is relatively shallow, the theoretical analysis is relatively insuf...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F30/17G06F30/20G06F119/14
CPCG06F30/17G06F30/20G06F2119/14
Inventor 桂海莲楚志兵赵晓东帅美荣拓雷锋李岩张金凯丁强
Owner TAIYUAN UNIVERSITY OF SCIENCE AND TECHNOLOGY
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