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Integral spinning forming method for curved generatrix thin-walled shell with annular reinforcing ribs

A technology of circumferential stiffeners and thin-walled shells is applied in the field of integral spinning forming of thin-walled shells with circumferential stiffeners and curved busbars, which can solve the problems of being unable to apply to low-cost, large-scale engineering production, etc. Achieve the effect of saving mold investment and maintenance costs, ensuring dimensional accuracy and high reliability

Active Publication Date: 2019-02-19
AEROSPACE INST OF ADVANCED MATERIALS & PROCESSING TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The above factors make this backward method unsuitable for low-cost, high-volume engineering production

Method used

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  • Integral spinning forming method for curved generatrix thin-walled shell with annular reinforcing ribs
  • Integral spinning forming method for curved generatrix thin-walled shell with annular reinforcing ribs
  • Integral spinning forming method for curved generatrix thin-walled shell with annular reinforcing ribs

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0060] processed as image 3 The curved generatrix thin-wall shell shown has a manufacturing length of 1420mm, and the outer diameter of the large end is is 575mm, the outer diameter D2 of the small end is 425mm, and the wall thickness t1 is 4.2mm; the small end has a hoop rib, the width L3 of the hoop rib is 30mm, and the thickness t2 of the hoop rib is 12mm; the whole section includes a length of 920mm The straight barrel section L1 and the 500mm long curved busbar barrel section L2, the curved busbar section is a Karman curve, and the design material is 2A12 aluminum alloy.

[0061] Processing technology such as figure 1 shown in the following steps:

[0062] 1. Prepare the tube blank

[0063] The tube blank is designed as figure 2 In the structure shown, after the tube blank is processed by powerful spinning, its inner surface is bonded to the mold, and the size after bonding meets the inner diameter size requirements of the final product. The wall thickness t of the...

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Abstract

The invention provides an integral spinning forming method for a curved generatrix thin-walled shell with annular reinforcing ribs. A tube blank is machined into the shell through the forming method.The shell comprises a curved generatrix tube section and a straight tube section. The curved generatrix tube section is provided with the annular reinforcing ribs. The forming method comprises the following steps that (1) the tube blank is prepared; (2) stress relief treatment is conducted; (3) power spinning is conducted, specifically, (3.1) the initial spinning position and the final spinning position of the tube blank are determined, (3.2) the number of times of power spinning is determined, and design of a power spinning track is completed, (3.3) the tube blank is mounted, (3.4) a power spinning program based on the power spinning track is designed, and the power spinning program is started for power spinning until the pass of power spinning is completed, and (3.5) the step 3.4 if repeated, after several times of power spinning, the power spinning forming process is completed, and a semi-finished tube blank with stagewise thicknesses is obtained; and (4) closing and spinning are conducted. Through the technical scheme, costs such as mold input and maintenance are greatly reduced, and the production cost is lowered.

Description

technical field [0001] The invention relates to the technical field of spinning forming, in particular to an integral spinning forming method of a thin-walled casing with a curved generatrix bar in a circumferential direction. Background technique [0002] Curved generatrix thin-walled shell is a typical metal structural part in the aerospace field. At present, precision casting is mainly used for mass production of such products. However, when the product requires a circumferential rib structure, the precision casting process not only has a large allowance for subsequent turning, but also has a low material utilization rate, and the production efficiency cannot be guaranteed. Spinning is the main forming method of the curved generatrix type rotary shell. Using the powerful spinning process, the short and thick tube blank can be spun into a long and thin tube blank semi-finished product; on this basis, through the closing spinning process, Part of the tube blank can be form...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B21D22/14B21D41/04B23P15/00
CPCB21D22/14B21D41/04B23P15/00
Inventor 赵文龙王东坡马世成吾志岗孙昂汪宇羿张月倩
Owner AEROSPACE INST OF ADVANCED MATERIALS & PROCESSING TECH
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