Skin part longitudinal stretching woolen size determination method

A technology for skin parts and wool, which is applied in the field of longitudinal drawing wool size determination of skin parts, can solve problems such as large blindness and material waste, and achieve the effect of reducing material waste and increasing difficulty.

Inactive Publication Date: 2015-05-06
JIANGXI HONGDU AVIATION IND GRP
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AI Technical Summary

Problems solved by technology

In production, the design of drawing dies and the determination of drawing process parameters basically still rely on the experience of technicians and production workers. The mold design process and parts trial production process are very blind. This traditional "experience-based "The trial pull method makes the waste of materials in the production and trial production of skin parts still serious

Method used

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  • Skin part longitudinal stretching woolen size determination method
  • Skin part longitudinal stretching woolen size determination method
  • Skin part longitudinal stretching woolen size determination method

Examples

Experimental program
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Effect test

Embodiment

[0020] Example: see Figure 1 to Figure 5 .

[0021] A method for determining the size of longitudinally stretched wool for skin parts, the steps of which are as follows:

[0022] Step 1 analyzes the composition of the drawn wool,

[0023] Such as figure 1 shown. The wool is first held in the clamps of the device. The wool is manually clamped on the drawing equipment at a certain wrap angle. This is followed by pre-stretching and over-stretching. Sometimes it is necessary to continue to increase the cladding angle, and at the same time further increase the plastic deformation of the wool so that the wool can be fully attached to the mold. Finally, under the condition that the wrapping angle is basically unchanged, the wool is stretched again, which is called supplementary stretching. The final covering stretch and supplementary stretching are also collectively referred to as supplemental stretching. In the process of skin pulling shape, the limit point of the part is d...

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Abstract

The invention relates to the field of aerospace manufacturing, in particular to a skin part longitudinal stretching woolen size determination method. The method comprises the steps that 1, the composition of stretching woolen is analyzed, in the skin longitudinal stretching process, the situation that the woolen wraps a mold is analyzed, the woolen is divided into a part zone, a mold allowance, a suspending section, a clamping section and a clamping guiding section according to the contact between the woolen and the mold and a clamp, and the size of the woolen should be obtained by overlaying the sections; 2, the part size range is obtained through the method for calculating the longitudinal and transverse part length; 3, the woolen size is calculated and is composed of the part unfolding length, the allowance, the suspending section and the length of the clamp. According to the skin part longitudinal stretching woolen size determination method, material waste can be reduced, the woolen size design better adapts to the stretching technological process, and the phenomenon that the longitudinal stretching difficulty is increased due to the poor woolen size is avoided.

Description

technical field [0001] The invention relates to the field of aviation manufacturing, in particular to a method for determining the size of longitudinally stretched wool for skin parts. Background technique [0002] Skin parts are exterior parts that form and maintain the aerodynamic shape of an aircraft. Stretch forming (referred to as stretch forming) is a process method of overmolding with a mold, and it is one of the main forming methods for forming aircraft skin parts. The two sides of the wool are clamped by the clamp of the equipment, and the movement of the mold and the clamp is used to make the wool produce uneven stretching deformation, and the mold is covered to make the wool and the mold fit. [0003] Stretching is the main process method of skin forming, and skin stretching technology is an important symbol to measure the ability and level of aircraft manufacturing. The manufacturing level of skin parts directly reflects the level achieved by the aviation manuf...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B21D22/22
CPCB21D22/22
Inventor 文松涛曾斌彭静文
Owner JIANGXI HONGDU AVIATION IND GRP
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