A Bending Springback Prediction Method for Freeform Surfaces of Thin Plates
A technology of bending springback and prediction method, which is applied in the field of sheet metal stamping and can solve problems affecting assembly and its use.
Active Publication Date: 2020-03-20
FUJIAN MINLU LIGHTWEIGHT AUTOMOBILE MFG CO LTD
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- Abstract
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- Application Information
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Problems solved by technology
When the amount of rebound exceeds a certain range, it will become a defect, which will affect the assembly and use of other parts
Method used
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Embodiment Construction
[0027] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings.
[0028] In the embodiment, taking the high-quality carbon structural steel 08Al as an example, the yield strength σ s : 249MPa, elastic modulus E: 203280MPa, thickness t: 3mm, assuming that the sheet is fully plastic bending, ignoring the thinning of the sheet, and only considering the change of the neutral layer.
[0029] (1) drawn as figure 1 The cross-sectional view of the stamped thin plate part shown, the neutral layer cross-section of the required bending part, and establish a coordinate system;
[0030] (2) if figure 2 As shown, the section of the drawn free-bending part is segmented into curves and straight segments, and the segments are curved segments S1, S2; straight segments L1, L2, L3. Take segment points a1, a2, a3, a4, and record the coordinates, a1(0.00mm, 95.00mm), a2(67.18mm, 67.18mm), a3...
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Abstract
The invention discloses a thin slab free curved surface bending spring back predicating method. The thin slab free curved surface bending spring back predicating method comprises the following steps of: drawing a neutral layer sectional view of a curved part, performing segment processing on a curved section and a linear section of the neutral layer sectional view, and determining a radius of curvature after bending and unloading; determining a bending angle resilience value; calculating a bending radius and a bending angle resilience value of each curved section, and drawing a novel curved section after bending and rebounding; getting and connecting the linear section to two novel curved sections, taking a tangent line slope mean value of two connecting points as a slope value after the linear section is bent, enabling the section to pass through a centre point, and calculating and determining a novel linear section equation after bending and rebounding; moving and rotating the novelcurved sections, and enabling the novel curved sections to be tangential to the novel linear section at two end points of the novel linear section; and obtaining a plurality of curved lines which arecompletely rebounded. The curved section and the linear section in a neutral layer of a bent part are subjected to segment processing, and a method of adding the slope of the end points of the jointsof the curved section and the linear section of the neutral layer in the section line of a stamped part is adopted to obtain resilience of multiple bent curved sections and the linear section.
Description
technical field [0001] The invention relates to the field of plate stamping processing, in particular to a method for predicting bending springback of a free-form surface of a thin plate. Background technique [0002] Sheet metal stamping is a technology that uses molds and stamping equipment to plastically deform the sheet and obtain the required shape of the part. Sheet metal stamping is a commonly used plastic forming method. It has many advantages such as high production efficiency, low cost, low consumption, simple operation, and easy mechanization and automation. It is widely used in aerospace, mechanical instrumentation, automobile industry, and electrical engineering. and other industrial fields. There are complex physical phenomena such as elastic-plastic deformation, friction and wear, and contact in the stamping forming process. Due to the existence of these complex physical phenomena, it is difficult to precisely control the stamping forming process, and defect...
Claims
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IPC IPC(8): B21D5/00G06F30/20
CPCB21D5/00G06F30/17
Inventor 王乾廷梁卫抗许琼琦陈鼎宁陈文哲马立安
Owner FUJIAN MINLU LIGHTWEIGHT AUTOMOBILE MFG CO LTD