A Design Method for Sag Compensation of Sheet Metal Parts
A technology of sheet metal parts and design methods, which is applied in the field of sheet metal parts processing, can solve problems such as unfavorable mass production, poor quality of manual blanking, and inaccurate blanking sizes, so as to reduce the risk of small manual blanking and save cost, work efficiency improvement effect
Active Publication Date: 2018-01-16
SHENYANG AIRCRAFT CORP
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Problems solved by technology
However, it is not accurate enough for workers to increase the blanking size based on personal experience, and it cannot completely avoid the occurrence of small parts. The quality of manual blanking is poor and the efficiency is low, which is not conducive to mass production.
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[0029] Such as Figure 1-3 The flange 2 of a sheet metal part 1 shown has a depression 3, such as Figure 4 Shown is the unwrapped dataset for this Sheet Metal Part 1. The data set has the shape boundary line 4 of the sheet metal part 1 and the tangent line 5 of the inner corner of the flange. The temporary point of deformation of gold part 1.
[0030] A design method for sag compensation of sheet metal parts, comprising the following steps,
[0031] 1) Expand the data set for the sheet metal part 1 with sag, and set the shape boundary line 4 with 3 sags in the data set to L 3 , sheet metal part 1 with L 3 An adjacent outline boundary line 4 is set to L 1 ;
[0032] 2) In the data set, select the critical point of the deformation of the sagging end of the flange 2 in the sheet metal part 1 as the starting point C of the sag expansion compensation 7; specifically, in the data set, use the tangent point 6 of the inner corner of the bending of the sheet metal part as the ta...
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The invention discloses a design method for sag compensation of sheet metal parts, which includes the following steps: 1) developing a data set for a sheet metal part with sag, setting the outline boundary line of the sag in the data set to L3, and setting the sag side of the sheet metal part The shape boundary line is set to L1, and L3 is adjacent to L1; 2) Select the critical point of the deformation of the bent end of the sheet metal part in the data set as the starting point C of the sag expansion compensation; 3) Design the expansion of the sheet metal part in the data set Point B, the maximum value of the expansion, connects points B and C to obtain line segment BC; 4) In the data set, point B is used as the tangent of the sunken arc in the sheet metal part, and the tangent point between the tangent and the sunken arc is set to D. Connect the points D and B to obtain the line segment BD; 5) Chamfer the line segment BC and the line segment BD, and the closed area formed is the sag expansion compensation. Ensure that the expanded size of sheet metal parts with sag meets the forming needs, improve the blanking accuracy and work efficiency of sheet metal parts, and save manufacturing costs.
Description
technical field [0001] The invention relates to the field of sheet metal parts processing, in particular to a design method for sag compensation of sheet metal parts. Background technique [0002] In the process of aircraft manufacturing, sheet metal parts are the most common type of parts. Due to the high precision of aircraft manufacturing and assembly, it requires high processing accuracy of sheet metal parts. However, among the sheet metal parts, there are many sheet metal parts with sags. This kind of parts has a special structure, and the expanded size calculated according to the calculation formula often does not conform to the actual production. The parts will shrink strongly at the sag during the forming process. The local size of sheet metal parts will be too small near the sunken trimming, which will lead to out-of-tolerance and scrapping of parts. For sheet metal parts with sag produced in batches, such problems need to be solved urgently. In order to solve the ...
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IPC IPC(8): G06F17/50
Inventor 张云鹏时贵雨安冬梅
Owner SHENYANG AIRCRAFT CORP