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Overall superplastic forming method of variable cross-section cylindrical shell

A technology of superplastic forming and variable section, applied in the field of forming process of cylindrical metal shell structure, can solve the problems of low shape accuracy and uneven wall thickness distribution, and achieve the effect of uniform wall thickness

Active Publication Date: 2016-11-16
AEROSPACE RES INST OF MATERIAL & PROCESSING TECH +1
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  • Application Information

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Problems solved by technology

[0005] The technical problem solved by the present invention is: through targeted blank preparation and superplastic forming process control, the phenomenon of low shape accuracy and uneven wall thickness distribution of the cylindrical shell with variable cross-section structure can be solved, and the product can be improved. Dimensional accuracy

Method used

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  • Overall superplastic forming method of variable cross-section cylindrical shell
  • Overall superplastic forming method of variable cross-section cylindrical shell
  • Overall superplastic forming method of variable cross-section cylindrical shell

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Experimental program
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Embodiment Construction

[0031] to attach figure 1 The part shown is taken as an example for superplastic forming of a cylindrical part with a variable cross-section structure with uniform wall thickness distribution. The specific process is as follows:

[0032] 1. Calculation of forming blank size

[0033] as attached figure 2 As shown, according to the part design drawing, the parts are split equidistantly along the axial direction, and the number N of equidistant splits satisfies the following relationship: Among them, E is the mean value of the cross-sectional perimeter of the front and rear ends of the part; F is the perimeter of the part, Represents rounding up. Measure the perimeter of each divided section. This cross-section can be the inner or outer surface of the part, and the specific selection is based on the highest dimensional accuracy of the final part vice versa). After the circumference of the section is measured, draw the blank drawing.

[0034] When the change of the peri...

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Abstract

Provides is an overall superplastic forming method of a variable cross-section cylindrical shell. Firstly, blank calculation is conducted, a designed part is equally divided into a plurality of sections through an axial sectioning method, the perimeter of each section is measured, and a cylindrical blank with the perimeter change trend close to the result is prepared according to the result. Then, the cylindrical blank is subjected to hot pressing performing, so that the change trend of the section appearance is close to that of a target part. Finally, overall blow molding is conducted through superplastic forming, and the forming process is completed. The overall superplastic forming scheme is adopted, the overall superplastic forming of cylindrical metal shell-class parts with the variable cross sections is achieved through the forming blank size calculation, forming mold design, hot pressing performing, superplastic finished forming and other processes, and the purposes of improving the integrality, the size accuracy and the wall thickness distribution accuracy of the parts are achieved.

Description

technical field [0001] The invention relates to a forming process of a cylindrical metal shell structure, in particular to an integral superplastic forming process of a cylindrical metal shell with a variable cross-sectional shape. Background technique [0002] The superplastic forming process is usually applied to the forming of metal sheets. This process can be used to form curved shell parts with complex shapes. The parts have the advantages of high dimensional accuracy, uniform wall thickness distribution, no internal stress, and stable shape. It can be applied to The manufacture of aircraft parts with curved aerodynamic shapes meets high-precision design requirements. [0003] The process is realized by high-pressure blow molding of superplastic sheet metal blanks with inert gas in the mold cavity of the part at high temperature. The superplastic forming mold is in the form of a full concave mold. The cavity size of the concave mold refers to the surface design of the ...

Claims

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Application Information

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IPC IPC(8): B23P15/00B21D22/02
CPCB21D22/02B21D22/022B23P15/00
Inventor 高鹏阴中炜微石张绪虎石刚纪玮
Owner AEROSPACE RES INST OF MATERIAL & PROCESSING TECH
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