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A method for controlling the machining deformation of long beam parts

A part processing and deformation control technology, applied in metal processing and other directions, can solve the problems of small buffering effect of side bending deformation, the number of stress relief grooves, size constraints, deformation cannot be ignored, etc., to ensure processing quality and reduce side bending The amount of deformation and the effect of reducing artificial intervention points

Active Publication Date: 2022-07-15
CHENGDU AIRCRAFT INDUSTRY GROUP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] 1. There are many manual intervention points in the processing process, and the workers' clamping and processing experience are uneven, and the processing methods for the deformation of parts are different, resulting in the processing of the final parts from good to bad, which cannot be stabilized
[0007] 2. Due to the impact of the current international situation, a large number of imported materials have been replaced by domestic materials. From the analysis of processing performance alone, domestic materials cannot be compared with imported materials. The deformation of domestic materials is very common and the amount of deformation is large.
However, the original processing deformation control method is based on the deformation of imported materials, so it cannot completely solve the problem of processing deformation of domestic materials
[0008] 3. The processing equipment has been used for a long time, the precision and the stability of the spindle are no longer in the best state, and it is difficult to ensure stable milling during the processing
However, although the stress relief grooves are set, the method is relatively general, and there is no effective restriction on the number and size of the stress relief grooves, which greatly reduces the stress relief effect of the stress relief grooves
In addition, although the stress relief groove can reduce part of the deformation caused by stress release, for long beams, the deformation in the direction of the positioning surface cannot be ignored, and the anti-side bending holes cannot play any role in the deformation in the direction of the positioning surface. It can only play a small cushioning effect on the side bending deformation, so the deformation of the part still exists, and it cannot be eliminated twice

Method used

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  • A method for controlling the machining deformation of long beam parts
  • A method for controlling the machining deformation of long beam parts
  • A method for controlling the machining deformation of long beam parts

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0054] see Figure 1-Figure 5 , a processing deformation control method for long beam parts, comprising the following steps:

[0055] a. Set the blank of the part horizontally, observe the deformation of the blank of the part, the maximum deformation is h a , and then perform stress-free shaving on the part blank, and the amount of stress-free shaving is , so that h c ≥h a ;

[0056] b. Punch the part blank and countersink, according to the length of the part blank and part blank width Calculate the number n of fiber cutting grooves, and evenly arrange fiber cutting grooves;

[0057] c. According to the maximum groove depth allowance distribution D of the part blank 1 and the minimum groove depth allowance distribution D 2 Determine the maximum groove depth h of the fiber cutting groove e and the minimum groove depth h f , select a tool with a diameter of D for rough machining, and the width of the rough machining fiber cutting groove is L, so that D<L≤2D;

[005...

Embodiment 2

[0062] see Figure 1-Figure 5 , a processing deformation control method for long beam parts, comprising the following steps:

[0063] a. Set the blank of the part horizontally, observe the deformation of the blank of the part, the maximum deformation is h a , and then perform stress-free shaving on the part blank, and the amount of stress-free shaving is , so that h c ≥h a ;

[0064] b. Punch the part blank and countersink, according to the length of the part blank and part blank width Calculate the number n of fiber cutting grooves, and evenly arrange fiber cutting grooves;

[0065] c. According to the maximum groove depth allowance distribution D of the part blank 1 and the minimum groove depth allowance distribution D 2 Determine the maximum groove depth h of the fiber cutting groove e and the minimum groove depth h f , select a tool with a diameter of D for rough machining, and the width of the rough machining fiber cutting groove is L, so that D<L≤2D;

[006...

Embodiment 3

[0071] see Figure 1-Figure 5 , a processing deformation control method for long beam parts, comprising the following steps:

[0072] a. Set the blank of the part horizontally, observe the deformation of the blank of the part, the maximum deformation is h a , and then perform stress-free shaving on the part blank, and the amount of stress-free shaving is , so that h c ≥h a ;

[0073] b. Punch the part blank and countersink, according to the length of the part blank and part blank width Calculate the number n of fiber cutting grooves, and evenly arrange fiber cutting grooves;

[0074] c. According to the maximum groove depth allowance distribution D of the part blank 1 and the minimum groove depth allowance distribution D 2 Determine the maximum groove depth h of the fiber cutting groove e and the minimum groove depth h f , select a tool with a diameter of D for roughing, and the width of the roughing fiber cutting groove is L, so that D<L≤2D;

[0075] d. After th...

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Abstract

The invention discloses a processing deformation control method for long beam parts, which belongs to the technical field of numerical control machining of aviation structural parts. Spot facing, calculate the number of fiber cutting grooves; c. Determine the maximum groove depth and minimum groove depth of the fiber cutting groove, and perform rough machining; d. Aging treatment, determine the height difference of the positioning boss and the height difference of the positioning boss, and complete the positioning Boss processing; e. Stress-free clamping of the part blank, and pressing the positioning boss to complete the finishing of the part. Through the accurate calculation of the number and size of the fiber cutting grooves, the invention can reduce the deformation of the part blank to the greatest extent, and can reduce the deformation of the positioning surface and side bending, without the need for anti-side bending holes, and through the organic combination with the positioning boss, It can accurately eliminate the residual deformation after eliminating the fiber cutting groove, and eliminate the deformation twice.

Description

technical field [0001] The invention relates to the technical field of numerical control machining of aviation structural parts, in particular to a method for controlling machining deformation of long beam parts. Background technique [0002] Long beam parts refer to parts with an aspect ratio greater than 10. With the development of aviation structural parts manufacturing technology, as aircraft structural parts are developing in the direction of integration, large-scale and complex theoretical shape, the proportion of long beam parts is increasing, and the processing difficulty is also increasing. [0003] Long beam parts are easily deformed during CNC machining. The most common situation is that the middle of the part is arched, which causes the parts to be unable to be clamped normally and affects the CNC machining. In view of the problem of easy deformation of long beam parts, the current measure is to divide the processing process of the parts into roughing, semi-fini...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B23P25/00
CPCB23P25/00
Inventor 方雨舟周进张也钟建张杨胡龙
Owner CHENGDU AIRCRAFT INDUSTRY GROUP
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