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Fluid forming method of sheet metal part for gas turbine exhaust channel supporting wall

A gas turbine and supporting wall technology, applied in the field of sheet metal forming, can solve the problems of poor product forming process, difficult forming, and less material thinning, so as to reduce one-time processing investment, ensure wall thickness reduction, and reduce splicing welding seam effect

Inactive Publication Date: 2019-04-05
SHANGHAI AEROSPACE EQUIP MFG GENERAL FACTORY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Using the spinning forming method, the material is rolled between the rotary wheel and the mandrel for multiple passes, which may easily cause the thickness of the product material to be thinned out of tolerance, and the manufacturing cost of the mandrel for large structural parts is high, which is difficult for small batch trial production. At the same time, it is difficult to process the reinforcing ribs in the exhaust duct by spinning forming, which can only be realized by later welding assembly; using deep drawing forming, on the one hand, the material is seriously thinned at the edge of the blank holder and the die fillet, usually reaching 30-40%, easy to exceed the tolerance, on the other hand, the flow resistance of the material at the large mouth of the exhaust duct is relatively large, forming is difficult, and the product forming process is poor. At the same time, for large structural parts, a press with a larger tonnage and Large-scale convex and concave dies are difficult to achieve in production, and deep drawing cannot realize the overall formation of the internal rib structure, which can only be realized by subsequent welding assembly
[0005] In short, the traditional two forming methods are difficult to meet the requirements of high precision, less material thinning and good rigidity of the exhaust port support wall

Method used

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  • Fluid forming method of sheet metal part for gas turbine exhaust channel supporting wall
  • Fluid forming method of sheet metal part for gas turbine exhaust channel supporting wall
  • Fluid forming method of sheet metal part for gas turbine exhaust channel supporting wall

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0046] Processing little endian 1050, big endian 1600, height 359, ellipse-shaped curved body with outer ribs

[0047] The processing flow chart is attached Figure 4 shown.

[0048] (1) Equipment and parameter selection

[0049] According to the envelope size of the outer contour of the structural parts, a 400T pressure forming machine is selected, and high-pressure water is selected as the fluid medium.

[0050] (2) Design of forming blank

[0051] According to the expansion diagram of the formed parts, design the splicing form of the blank. Tailor-welded three-layer nested plates are taken, preformed to the cone. The splicing method of blanks and the top view of splicing are as follows: figure 2 shown. At the same time, the splicing weld of the rough blank is polished to prevent stress concentration points during the forming process.

[0052] (3), fluid forming tooling processing

[0053] Such as image 3As shown, the forming die is processed according to the ...

Embodiment 2

[0061] Processing little endian 608: big endian 1540, height 442, ellipsoidal curved body with internal ribs

[0062] Processing flow chart such as Figure 4 shown.

[0063] (1) Equipment and parameter selection

[0064] As in Example 1.

[0065] (2) Design of forming blank

[0066] As in Example 1.

[0067] (3) Fluid forming tooling processing

[0068] Such as image 3 As shown, the forming die is processed according to the actual size of the product, and the ribs are processed in the forming die according to the product pattern, so that the inner rib protrusions can be formed while the fluid is bulging. Bottom plate, pressure plate and other auxiliary devices are processed in the same proportion as the product structure size, and the thickness is 50-80mm.

[0069] All the other steps are the same as in Example 1.

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Abstract

The invention provides a fluid forming method of a sheet metal part for a gas turbine exhaust channel supporting wall. The fluid forming method for the sheet metal part for the gas turbine exhaust channel supporting wall is characterized in that the fluid forming method of the sheet metal part for the gas turbine exhaust channel supporting wall comprises the following steps that equipment for machining the supporting wall sheet metal part is selected; forming blank material design is carried out; a tool used for fluid forming is designed; blank material clamping and positioning are carried out; liquid filling and bulging are carried out; and spare of a forming part is cut and removed. According to the yield strength and structure form of materials used in the supporting wall, tonnage and liquid filling pressure of the equipment needed for bulging are calculated, and a bulging liquid medium is selected.

Description

technical field [0001] The invention relates to a fluid forming processing technology for large sheet metal parts, in particular to a method for fluid forming of a sheet metal part used for a supporting wall of a gas turbine exhaust passage, and belongs to the field of sheet metal forming. Background technique [0002] Large gas turbine power plant is widely used in aviation, military, shipbuilding, power generation and other industries due to its characteristics of fast acceleration and start-up and high power. The gas turbine power plant is equipped with a free turbine through the gas generator. When the output power of the rear shaft is used, the exhaust gas needs to be installed with an exhaust system in the form of an exhaust volute or an exhaust duct. Unlike the compressor and turbine components, the exhaust system has a direct impact on the performance of the gas turbine, but it will indirectly affect the working state of the gas turbine. According to the document "Z...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B21D26/033B21D26/047B23P15/00
CPCB21D26/033B21D26/047B23P15/00
Inventor 王煜张志超胡蓝苏培博肖冰娥王建光雷湘衡龚雄
Owner SHANGHAI AEROSPACE EQUIP MFG GENERAL FACTORY
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