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Accurate preforming method for large-curvature metal thick plate

A pre-forming, large-curvature technology, used in forming tools, metal processing equipment, manufacturing tools, etc., can solve the problems of unrealized installation and application of composite parts, reduce the amount of CNC machining, meet thermal uniformity and porosity, The effect of ensuring air tightness and wall thickness uniformity

Active Publication Date: 2021-10-01
CHENGDU AIRCRAFT INDUSTRY GROUP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the bottleneck of this technology, a certain part of a certain type of aircraft in my country has not realized the installation and application of composite parts for many years

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] The die design technical solution of this embodiment is: extract the inner and outer profiles of the mold template, in which a margin of 3 mm is left on the inner profile (the side in contact with the frame), and a margin of 5-6 mm is reserved on the outer profile, and the template parts are roughly leveled Height in the length direction, level the parts so that there is no negative angle in the Z direction of the parts, leave a margin of 40-60mm in the width direction of the part, and place a margin of 150-200mm in the length direction. After the extracted outer surface is extrapolated and extended by 40-60mm, then it is extrapolated and extended in the direction of the outer shape or stretched along a certain angle (the angle must not be less than the minimum angle of the original curved surface), and the designed curved surface is used to cut the boss to form a pressed surface. Mold under the mold body. According to the surface of the lower mold body of the compressi...

Embodiment 2

[0032] The die design scheme of this embodiment is as follows: after the design of the die is completed, the hot-pressed part is unfolded to form a blank, and the blank is placed on the lower die, and stoppers are respectively set in the length and width directions of the part. It is used to fix the blank parts when the parts are formed.

Embodiment 3

[0034] The die design scheme of this embodiment is as follows: after the design of the die is completed, widen the two ends of the upper die part with a thickness of 60-100mm and a width of 100-150mm for lugs, and set evenly spaced and fixed lugs on the lugs. U-shaped groove. And according to the size of the dovetail of the hot press, design a universal mold base. The dovetail part of the mold base is matched with the hot press. A step with a height of 70mm is set on the mold base, and U-shaped grooves with the same interval are set according to the position of the U-shaped groove on the upper mold. groove. The general U-groove length covers the width difference of the upper mold of the general deep cavity mold.

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Abstract

The invention discloses an accurate preforming method for a large-curvature metal thick plate. The accurate preforming method comprises the following steps that 1) a mold is designed; (2) a hot-pressed part is unfolded to form a blank material, and the blank material is placed in the mold; (3) simulation is conducted through an Abqus finite element; 4) the mold is cast; (5) the mold is installed; (6) an expansion mathematical model of the reserved part appearance allowance is designed according to the mold, and the blank material specification is selected according to the allowance in the thickness direction; and (7) the blank is subjected to hot pressing, the part preforming process is conducted, and a formed part is obtained. The whole set of accurate preforming method for the large-curvature metal thick plate is provided, an invar steel formwork blank with the large thickness size can be integrally formed, the manufacturing precision reaches + / -2 mm, the thickness uniformity of a composite mold formwork is greatly improved, the air tightness of the formwork in the later period is guaranteed, and therefore the requirements for the heat uniformity and porosity of composite parts are met, the manufacturing cost is greatly reduced, and the production and manufacturing period is greatly shortened.

Description

technical field [0001] The invention relates to the technical field of aviation equipment manufacturing, in particular to a method for precise preforming of large curvature metal thick plates. Background technique [0002] Advanced composite material parts are widely used in the production and manufacture of new generation fighters due to their advantages of light weight, corrosion resistance and strong designability. In the manufacturing process of composite molds, the mold surface is determined by the shape of the parts. With the improvement of the designability of composite parts, the shape of the parts tends to have characteristics such as large curvature and deep cavity. In order to ensure the overall quality of composite parts, composite mold templates usually have requirements for thermal uniformity and air tightness. In order to ensure the overall structural strength, the template thickness of the composite molded parts is generally 12-16mm, and in order to ensure t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B21D37/20B21D22/20B21D22/22B21D53/92
CPCB21D37/20B21D22/203B21D22/208B21D22/22B21D53/92
Inventor 张小波岳维邹震宇李涛邓文秀张毅郑伟涛
Owner CHENGDU AIRCRAFT INDUSTRY GROUP
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