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Calculation method for sinking and deepening values of flange of a sheet metal part

A calculation method and technology of deepening value, applied in the field of sheet metal processing, can solve problems such as insufficient deepening and excessive deepening of subsidence areas

Active Publication Date: 2015-09-16
JIANGXI HONGDU AVIATION IND GRP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, there is a problem of insufficient deepening or excessive deepening in the treatment of subsidence areas in engineering practice.

Method used

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  • Calculation method for sinking and deepening values of flange of a sheet metal part
  • Calculation method for sinking and deepening values of flange of a sheet metal part
  • Calculation method for sinking and deepening values of flange of a sheet metal part

Examples

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Embodiment 1

[0025] by figure 1 Example Take the part of the rear part of the rib of aircraft 2 as an example, take the flange sinking 1 of the part, and illustrate the method of flange sinking in combination with the attached drawings.

[0026] Step 1: In order to make the parts more accurate after forming, it is necessary to ensure the shape accuracy and dimensional accuracy of the parts after forming. The outer surface of the frame rib part is mainly determined by the web surface and the flange area of ​​the flange, so it is necessary to ensure that the distance between the flange area BH of the formed part and the corresponding point of the design model CF is the smallest, as shown in image 3 shown. The method of determining the minimum distance between corresponding points is as follows:

[0027] Step a: Assume that the sag deepening value is When , the design model coincides with the formed part at the upper end point of the flange segment, and the distance at the lower end poin...

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Abstract

The invention provides a calculation method for sinking and deepening values of a flange of a sheet metal part. The calculation method for the sinking and deepening values of flange of the sheet metal part comprises the following steps: firstly ensuring that the distances from BH points of flange area of a formed part to CF corresponding points of a design model are minimum, then deducing a deepening value calculation formula according to the geometrical relationship, and finally obtaining the sinking and deepening values by virtue of combination of overlap ratio of the design model and the flange section of the formed part and the shape accuracy of the part. By virtue of the calculation method for the sinking and deepening values of the flange of the sheet metal part, the deepening value can be accurately calculated according to the specific structure size of the sinking area; the assembly requirement of the part can be met.

Description

technical field [0001] The invention belongs to the technical field of sheet metal processing, and relates to a method for calculating the sinking deepening value of a curved frame rib part with a sinking. The deepening value is accurately calculated according to the specific structural size of the sag area, which can meet the assembly requirements of the parts, and a calculation method for the sag deepening value of the flange is provided. Background technique [0002] The parts with sunken curved frame ribs are often used in the wing ribs and fuselage bulkheads of large passenger aircraft. As an important part of the aircraft structure, frame rib parts directly affect the shape accuracy and structural bearing capacity of the aircraft, and its manufacture has become an important link in determining the overall performance of the aircraft. The development of modern aircraft has made its shape changes more complex, and at the same time, the requirements for fatigue performan...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F17/50
Inventor 何爱平江涛李仁花唐大友张文俊
Owner JIANGXI HONGDU AVIATION IND GRP