Thermal creeping forming method for machining of titanium alloy cover of weight reduction tank

A technology of mechanical processing and weight-reducing grooves, which is applied in the direction of metal processing equipment, forming tools, manufacturing tools, etc., can solve problems such as uneven corrosion edges, environmental pollution, and poor fatigue stability, so as to reduce stress concentration and improve Dimensional control accuracy and effects of improving fatigue resistance

Inactive Publication Date: 2017-01-04
北京普惠三航科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Titanium alloy hot-pressed skin has a weight-reducing groove on the part because of the need for weight reduction. Previously, the weight-reducing groove was processed by chemical corrosion. This process is not conducive to the weight-reducing groove due to the serrated edge formed after corrosion. shape and size control
The processing accuracy of chemical corrosion is generally ±0.05~±0.15mm, the surface roughness reaches Ra1.6~6.4μm, and it will also dissolve in the side direction under the protective layer, and form an arc shape between the processed bottom surfac

Method used

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  • Thermal creeping forming method for machining of titanium alloy cover of weight reduction tank
  • Thermal creeping forming method for machining of titanium alloy cover of weight reduction tank
  • Thermal creeping forming method for machining of titanium alloy cover of weight reduction tank

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0045] A thermal creep forming method for machining a titanium alloy skin of a weight reduction groove, comprising the following steps:

[0046] (1) Forming mold making

[0047] During thermal creep forming of titanium alloy skin, it is necessary to use a mold to control the shape of the part. The mold includes a punch and a die. The cavity surfaces of the punch and die are consistent with the appearance of the thermally creep-formed skin. Positioning holes, temperature measuring holes, and hoisting holes are processed on the die and punch respectively;

[0048] (2) Blank processing

[0049] Calculate the theoretical size of the unfolded blank according to the product size of the skin, add a 5mm process allowance, use wire cutting to process the outer contour of the blank according to the size requirements, and use a milling machine to pre-process weight-reducing grooves of corresponding sizes on the blank. The size of the billet is calculated using the theory of constant vo...

Embodiment 2

[0064] A thermal creep forming method for machining a titanium alloy skin of a weight reduction groove, comprising the following steps:

[0065] (1) Forming mold making

[0066] During thermal creep forming of titanium alloy skin, it is necessary to use a mold to control the shape of the part. The mold includes a punch and a die. The cavity surfaces of the punch and die are consistent with the appearance of the thermally creep-formed skin. Positioning holes, temperature measuring holes, and hoisting holes are processed on the die and punch respectively;

[0067] (2) Blank processing

[0068] Calculate the theoretical size of the unfolded blank according to the product size of the skin, add 8mm process allowance, process the outer contour of the blank by wire cutting according to the size requirements, and pre-process weight-reducing grooves and weight-reducing grooves of corresponding sizes on the blank by using a milling machine The size of the billet is calculated using th...

Embodiment 3

[0083] A thermal creep forming method for machining a titanium alloy skin of a weight reduction groove, comprising the following steps:

[0084] (1) Forming mold making

[0085] During thermal creep forming of titanium alloy skin, it is necessary to use a mold to control the shape of the part. The mold includes a punch and a die. The cavity surfaces of the punch and die are consistent with the appearance of the thermally creep-formed skin. Positioning holes, temperature measuring holes, and hoisting holes are processed on the die and punch respectively;

[0086] (2) Blank processing

[0087] Calculate the theoretical size of the blank after unfolding according to the product size of the skin, add 10mm of process allowance, use wire cutting to process the outer contour of the blank according to the size requirements, and use a milling machine to pre-process weight-reducing grooves and weight-reducing grooves of corresponding sizes on the blank The size of the billet is calcul...

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Abstract

The invention belongs to the technical field of thermal-press formation of a titanium alloy part and aims at providing a thermal creeping forming method for machining of a titanium alloy cover of weight reduction tank. By means of the method, the precision and performance of the part are improved, the production efficiency is improved, and pollution is avoided. According to the method, a mold matched with the cover part is manufactured firstly so that the outline of the part can be controlled, then the weight reduction tank is pre-machined in a machining mode, and the cover part is formed through the thermal creeping method. The problems that the dimension precision of the weight reduction tank is low and the fatigue performance of components is low due to the traditional mode that thermal creeping forming of the cover is carried out before chemical corrosion machining of the weight reduction tank are solved; the dimension control precision of the weight reduction tank is significantly improved; and the R corners of the arc transitional area of a weight reduction area and a non-weight reduction area are increased from R5 from R2 generated by acid pickling, stress concentration of the transitional area is relieved, and fatigue resistance of the part is improved. The problem of severe chemical corrosion pollution is solved, the physical health of operators is ensured, and the dimension precision and fatigue performance of the components are improved.

Description

technical field [0001] The invention belongs to the technical field of hot press forming of titanium alloy parts, in particular to a thermal creep forming method of a titanium alloy skin of a mechanically processed weight-reducing groove. Background technique [0002] Titanium alloy is a new type of structural material with excellent comprehensive properties: low density (about 4.5g / cm 3 ), high specific strength, good fatigue strength and crack growth resistance, good low temperature toughness, and good corrosion resistance. Therefore, it has been widely used in aviation, aerospace, shipbuilding and other fields. For components such as the inner and outer fairings of aero-engines, the inner ring of the guider, and the air collection chamber of the compressor, the hot-press forming technology of titanium alloy sheets has been widely used in the world. In my country's aviation manufacturing process, the hot forming technology of titanium alloy sheet is gradually being promo...

Claims

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Application Information

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IPC IPC(8): B23P15/00B21D22/02B21D24/16B21D37/16
CPCB23P15/00B21D22/02B21D24/16B21D37/16
Inventor 雷鹍刘新芹李升
Owner 北京普惠三航科技有限公司
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