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Online sensing method for spinning forming state

A spinning forming, state technology, applied in the direction of instrument, design optimization/simulation, electrical digital data processing, etc., can solve the problems of high surface quality requirements, difficult application, inability to meet, etc., to improve the degree of intelligence, reduce flange The degree of fluctuation, the effect of ensuring accuracy

Active Publication Date: 2021-11-12
NORTHWESTERN POLYTECHNICAL UNIV
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  • Abstract
  • Description
  • Claims
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AI Technical Summary

Problems solved by technology

[0005] 1. During the spinning forming process, the relationship between the instantaneous configuration of the workpiece and the spinning forming parameters and the spinning forming state has not been established
[0006] 2. Although the online measurement of the instantaneous configuration of the workpiece has many methods such as machine vision online measurement and ultrasonic online measurement, it is still difficult to apply it in the spinning forming process, and it is difficult to truly realize the online measurement of the instantaneous configuration of the curved surface.
Ultrasonic on-line measurement has high requirements on the surface quality of the workpiece, and the measuring head needs to keep in contact with the rotating workpiece at all times, while the blank is in a rotating state during the spinning process of curved surface parts, and the position information of the measurement point changes all the time, which cannot meet the requirements of ultrasonic on-line measurement

Method used

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  • Online sensing method for spinning forming state
  • Online sensing method for spinning forming state
  • Online sensing method for spinning forming state

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] Example 1 Derivation of Instantaneous Normalized Thinning Rate Formula for Curved Surface Parts

[0043] This embodiment proposes a new mathematical formula that can directly predict the instantaneous normalized thinning rate of curved surface parts, using the radius r of the wheel 2, the width of the flange d, the elastic modulus E of the blank 1, and Poisson's ratio μ4 The key parameters in the spinning forming process can be used to calculate the normalized thinning rate of curved surface parts at a certain moment in the spinning forming process. The specific derivation process of the formula is as follows:

[0044] 1. Determination of important geometric parameters of instantaneous configuration of curved surface parts

[0045] During the spinning forming process of curved surface parts, the workpiece is mainly divided into two areas, the formed area and the unformed area. The unformed area is the flange part, and the flange width characteristics are constantly ch...

Embodiment 2

[0068] Embodiment 2 An online sensing method for spinning forming state

[0069] This embodiment obtains the instantaneous configuration of the curved surface part based on the laser scanner 4, and extracts two geometric parameters characterizing the instantaneous configuration of the curved surface part, the action radius r of the wheel 2 and the flange width d; the elastic modulus of the blank 1 is obtained from the unidirectional tensile test. Quantity E and Poisson's ratio μ two material parameters; According to these four parameters combined with the formula 1 in the embodiment 1, the instantaneous normalized thinning rate of the curved surface piece is predicted On this basis, according to the formula 2 in Embodiment 1, the spinning forming state of the curved surface part is judged, and then the online perception of the spinning forming state of the curved surface part is realized.

[0070] like Figure 4 As shown, this implementation includes the following steps, whe...

Embodiment 3

[0081] Embodiment 3 An online sensing method for spinning forming state

[0082] In this embodiment, taking the spinning process of a curved surface piece with a radius of blank 1 of 110mm, a thickness of blank 1 of 1mm, a radius of mandrel 5 of 45mm, and a half-cone angle α of the rotary wheel 2 of 50° as an example, the state of the curved surface piece at a certain moment of spinning judge. Among them, the material of blank 1 is 1060 aluminum alloy, and the initial flange width d 0 =65mm, initial blank 1 thickness t 0 = 1mm. The specific steps are as follows:

[0083] Step S1, install a laser scanner 4 on the upper side of the blank 1 in the machine tool, and ensure that: a, the laser line of the laser scanner is parallel to the direction of the main axis of the machine tool; b, the vertical distance between the laser scanner 4 and the blank 1 is 280-290mm , The vertical distance between the laser scanner 4 and the spindle of the machine tool is 38-43mm.

[0084] In th...

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Abstract

The invention belongs to the technical field of intelligent manufacturing, and discloses a spinning forming state online sensing method. The method comprises the following steps: acquiring two geometric parameters, namely a spinning roller acting radius r and a flange width d, representing the instantaneous configuration of a curved surface part based on a laser scanner; acquiring two material parameters, namely the elasticity modulus E and the Poisson ratio mu of the blank through a uniaxial tensile test; calculating the instantaneous normalized thinning rate of the curved surface part according to the four parameters in combination with an instantaneous normalized thinning rate formula; on the basis, achieving the online sensing of the spinning forming state of the workpiece according to the instantaneous normalized thinning rate. According to the method, the relation between the instantaneous normalized thinning rate formula of the curved surface part and the spinning forming state and the relation between the instantaneous normalized thinning rate and the spinning forming state have definite theoretical and practical bases, the accuracy of the online sensing result of the spinning forming state of the curved surface part can be ensured, and a basic basis can be provided for adjusting process parameters in real time in the spinning forming process.

Description

technical field [0001] The invention belongs to the technical field of intelligent manufacturing, and relates to the application of laser online measurement in spinning forming technology, in particular to an online sensing method of spinning forming state. Background technique [0002] Complex curved surface parts have the advantages of high structural strength, light weight and high reliability, and are widely used in aerospace fields. Spinning forming technology is an advanced plastic forming technology, which has the characteristics of low cost, short processing cycle and high flexibility. It is an important forming method for complex curved surface parts. During the spinning forming process, the blank is fixed by the tail top and the universal clamping die and rotated at a certain speed. Through the design and control of the spinning process parameters, the spinning wheel exerts local loading on the blank, resulting in continuous local deformation and then realizing the...

Claims

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Application Information

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IPC IPC(8): G06F30/20G06F111/04G06F119/14
CPCG06F30/20G06F2119/14G06F2111/04
Inventor 高鹏飞詹梅闫星港白丹妮马飞
Owner NORTHWESTERN POLYTECHNICAL UNIV
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