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Bending pipe numerically-controlled instruction-generating method considering springback compensation

A technology of springback compensation and command generation, which is applied in the direction of program control, computer control, general control system, etc., can solve the problems of low forming quality of parts, many factors affecting springback, and difficult springback prediction

Inactive Publication Date: 2012-07-04
SHENYANG AIRCRAFT CORP
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Problems solved by technology

[0003] However, since there is always springback during the unloading process of CNC pipe bends, and there are many springback influencing factors and mutual coupling, it is difficult to predict springback, and repeated trial bending is required to solve it in production, which not only leads to low forming quality of parts, but also It greatly reduces the efficiency of the CNC pipe bending machine and cannot meet the requirements of today's aircraft manufacturing and development

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  • Bending pipe numerically-controlled instruction-generating method considering springback compensation
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  • Bending pipe numerically-controlled instruction-generating method considering springback compensation

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Embodiment Construction

[0051] A method for generating numerical control commands for bending pipes considering springback compensation, the method comprising the following steps:

[0052] Step 1. Calculate the springback of the elbow

[0053] In step 1, the springback calculation adopts a bilinear strengthening model, see figure 1 , , E and E 1 are the slopes of line segments OA and AB, respectively. This approximate mechanical model is accurate enough for some materials, and if the slope of AB is small enough, it can be considered as an ideal elastoplastic body. Because the plastic forming of pipes is a complex process, in order to analyze the springback of pipes, the following assumptions are adopted: 1) The material volume is constant; 2) The material is homogeneous and isotropic; 3) Assuming a flat section, the section is still vertical after bending 4) Stress-neutral layer and strain-neutral layer overlap, but neutral layer shift occurs; 5) Distortion of pipe section, wall thickness chang...

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Abstract

The invention relates to a bending pipe numerically-controlled instruction-generating method considering springback compensation, which comprises the following steps of: 1. calculation of the springback amount of a bending pipe; and 2. generation of a numerically-controlled instruction. The method can be used for guiding the springback compensation in practical bending pipe forming, and the effects of decreasing the frequency of trial bending and improving the forming quality of pipe fittings are achieved.

Description

technical field [0001] The invention relates to a numerical control instruction generation method for bending pipes considering springback compensation, and belongs to the field of material processing engineering. Background technique [0002] Aircraft ducts have many varieties, large quantities, complex shapes, and strict quality requirements, which bring certain difficulties to the bending and forming of ducts. Because the CNC pipe bender can accurately and stably complete bending, feeding, cornering and other actions to ensure the bending accuracy of the pipe, it has become a key equipment in the manufacture of aviation pipes. At present, many domestic aviation manufacturing enterprises have introduced CNC pipe bending machines, and CNC pipe bending has gradually replaced the traditional pipe bending process and occupies an important position. [0003] However, since there is always springback during the unloading process of CNC pipe bends, and there are many springback ...

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Application Information

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IPC IPC(8): B21D7/12G05B19/4093
Inventor 张鑫李小强方静
Owner SHENYANG AIRCRAFT CORP
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