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The Method of Establishing the Wrinkling Prediction Model of Swivel Flange

A prediction model, flange technology, applied in metal processing equipment, geometric CAD, metal processing, etc., can solve the problems of low efficiency and a lot of time consuming to determine the forming performance

Active Publication Date: 2021-01-08
NORTHWESTERN POLYTECHNICAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Compared with the geometric intuition method and the spinning force method, although the prediction accuracy of the energy method is higher, it still requires a lot of time-consuming simulations, making the prediction of wrinkling and the determination of formability inefficient

Method used

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  • The Method of Establishing the Wrinkling Prediction Model of Swivel Flange
  • The Method of Establishing the Wrinkling Prediction Model of Swivel Flange
  • The Method of Establishing the Wrinkling Prediction Model of Swivel Flange

Examples

Experimental program
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Effect test

Embodiment 1

[0054] Embodiment 1: This embodiment is a method of using a prediction model for flange wrinkling in general rotation. In this example, the material strain strengthening index K of the slab is 93.9396 MPa, the hardening coefficient n is 0.1792, and the outer diameter of the slab b 0 78mm, mandrel radius R 0 is 45mm, the initial wall thickness t is 1mm, the feed ratio f is 0.4mm / r, and the half-cone angle α of the linear rotary wheel path is 60°. Based on formulas (5) and (6), the wrinkling time can be obtained as 10.7s.

Embodiment 2

[0055] Embodiment 2: This embodiment is a method of using a prediction model for flange wrinkling in general rotation. figure 1 Shown is the forming diagram of a 1mm thick slab considering wrinkling defects under a straight-line rotary wheel path established based on the wrinkling prediction model of the flange in general rotation. is the wrinkled area. Given the value of the forming parameters, the position of the corresponding point in the forming diagram can be determined. If the corresponding point is located below the wrinkling critical surface, it means that wrinkling defects will occur in the flange during the spinning process. figure 2 Shown is a 1mm thick slab of 1060 aluminum alloy general spinning test sample. When f = 0.3mm / r and α = 60°, the corresponding point in the forming diagram is located in the wrinkled area, and a small amount of wrinkles appear on the flange. Under the existing process conditions, the general rotary part cannot be successfully formed ( ...

Embodiment 3

[0056] Embodiment 3: This embodiment is a method of using a prediction model for flange wrinkling in general rotation. image 3 Shown is the limit half-cone angle of the linear roller path that can be successfully formed under different material hardening exponents n obtained based on formula (5). It can be seen that the smaller the material hardening index and the smaller the limit half-cone angle, the better the general spinning performance of the slab.

[0057] The establishment and use method of the wrinkling prediction model of the general rotation flange in the present invention can accurately establish the forming diagram considering the wrinkle defect, successfully predict the wrinkle defect of the general rotation flange, effectively evaluate its forming performance, and reasonably guide the general rotation craft design.

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Abstract

The invention discloses a method for establishing a conventional spinning flange wrinkling prediction model. The method comprises the steps that on the basis of the plastic forming theory and the conventional spinning mechanical characteristics, a flange maximum circumferential compressional stress model is established; on the basis of the limit theory, in combination with the flange wrinkling wave characteristics during conventional spinning, a flange critical circumferential compressional stress model is established; the mechanical condition of flange stabilization in the conventional spinning process is established; and the relationship between conventional spinning parameters in the critical wrinkling state is established. According to the method, the circumferential contraction of a flange in the conventional spinning process and the circumferential bending of the flange under the action of rotary wheel force are comprehensively considered to establish the flange wrinkling prediction model during conventional spinning, so that the forming characteristics of the flange in actual production can be truly reflected; and the maximum circumferential compressional stress model and the critical circumferential compressional stress model of the flange are established through a theoretical calculation method, so that the time-consuming and material-consuming plate blank conventionalspinning test with complex process and the finite element simulation are avoided, the wrinkling prediction result is prevented from being influenced by finite element modeling form and calculation precision, and flange wrinkling defects during conventional spinning are accurately and rapidly predicted.

Description

technical field [0001] The invention relates to the field of sheet metal forming processing, and relates to a method for establishing and using a wrinkle prediction model of a general-rotation center flange, which is mainly used for judging the instability and wrinkling of a general-rotation center flange, evaluating its forming performance, and obtaining the formability of a slab domain, providing theoretical guidance for the design of forming parameters and wheel path in general rotation. Background technique [0002] Metal sheet spinning is a local plastic deformation process. The slab clamped by the tail crown and the mandrel produces local plastic deformation due to the force of the wheel. With the high-speed rotation of the mandrel and the feed movement of the wheel, the local plastic deformation The deformation gradually extends to the entire slab. Due to the unique advantages of small forming force and high forming performance, metal sheet spinning process plays an ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B21D22/14B21C51/00G06F30/17
CPCB21C51/00B21D22/14
Inventor 詹梅高鹏飞陈淑婉马飞张洪瑞
Owner NORTHWESTERN POLYTECHNICAL UNIV