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Forming method for precise thermal bulging of titanium alloy conical barrel piece

A titanium alloy and thermal expansion technology, which is applied in the field of sheet metal thermoforming, can solve the problems of high risk in the manufacturing process of titanium alloy cones, poor mechanical properties of parts, and high manufacturing costs, and reduce equipment resources and hot pressing die costs. investment, high forming precision, reduced risk of welding process and excellent effect

Active Publication Date: 2018-08-07
AVIC BEIJING AERONAUTICAL MFG TECH RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For the blank after split forming, the welding edge misalignment should not exceed 0.1δ during tailor welding, where δ is the thickness of the original base metal, otherwise it will directly affect the quality of the weld seam. Therefore, the existing technology cannot well solve the problems of large-scale titanium alloy cone parts, such as high risk in the manufacturing process, high manufacturing cost, and poor mechanical properties of the parts.

Method used

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  • Forming method for precise thermal bulging of titanium alloy conical barrel piece
  • Forming method for precise thermal bulging of titanium alloy conical barrel piece

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Embodiment 1

[0033] Such as Figure 1-2 As shown, a forming method of precision thermal bulge forming of titanium alloy conical tube parts, the first step is to design the size of the ring blank according to the material forming limit principle, and determine the number of ring blank splits according to the original plate width of the titanium alloy, and set on the ring blank The limit hole is made in the blanking process, and the split blank is made into a ring blank through the roll bending process and the tailor welding process. The roll bending process and the tailor welding process can adopt the existing technology; the second step, the inner surface of the ring blank and The outer surface is evenly coated with anti-oxidation paint, the outer surface of the expansion core 1 and the bottom of the expansion valve 3 and the inner and outer surfaces of the expansion valve 3 are evenly coated with liquid graphite and then dried naturally; the third step is to insert the ring blank into the ...

Embodiment 2

[0036] Such as Figure 1-2 As shown, a forming method of precision thermal bulge forming of titanium alloy conical tube parts, the first step is to design the size of the ring blank according to the material forming limit principle, and determine the number of ring blank splits according to the original plate width of the titanium alloy, and set on the ring blank The limit hole is made in the blanking process, and the split blank is made into a ring blank through the roll bending process and tailor welding process. The roll bending process and tailor welding process can use the existing technology, and the design of the titanium alloy cone blank is also included. , the design of the blank of the titanium alloy cone is to design the blank of the titanium alloy cone as a conical annular blank whose busbar is a straight line segment, and adjust the outer diameter of the upper port and the lower port of the annular blank according to the principle of material forming limit, so that...

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Abstract

The invention provides a forming method for precise thermal bulging of a titanium alloy conical barrel piece. According to the technical key points, the forming method for precise thermal bulging of the titanium alloy conical barrel piece comprises five steps, and a mold in the forming method comprises expansion cores. The expansion cores are connected with limiting blocks. The exteriors of the expansion cores are connected with expansion clacks. The bottom of the mold is provided with bottom plates. The bottom plates are provided with pin rod holes. Pin rods penetrate through the interiors ofthe pin rod holes. One ends of the pin rods are connected with the expansion clacks. According to the forming method, the technological process can be simplified, once thermal cycle and surface treatment are reduced, the risks of peroxidation failure and hydrogen increasing of materials are reduced, reliability and the production efficiency of a product are improved, the input cost of equipment resources and a thermal press mold is reduced, the number of part weld joints is directly determined by the plate size of an annular blank and not limited by a forming technology, the number of the weld joints can be decreased to the maximum extent, the mechanical properties of parts are remarkably improved, the generatrix of the conical annular blank is a straight line segment, tailor-welding is straight seam welding, and the risk of a welding technology and the cost input of an auxiliary tailor-welding tool are reduced.

Description

technical field [0001] The invention relates to the technical field of hot forming of sheet metal, in particular to a forming method for precision thermal expansion of a titanium alloy cone tube. Background technique [0002] For example, titanium alloy cones with an outer diameter of 600-1000mm and a wall thickness of 1.0-3.0mm are mostly used on the outer wall of the aero-engine combustor, and are usually designed as a conical annular member whose busbar shape is a combination of straight lines, curves, etc., due to assembly requirements. The precision requirement is higher. At present, there is no overall manufacturing process for this kind of large-size titanium alloy cone in the existing technology. The more mature manufacturing process is to divide the cone into several petals, first divide the petals into hot pressing, and then weld them into a whole ring. The blank is finally thermally corrected to the actual required size through the thermal expansion effect of the...

Claims

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Application Information

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IPC IPC(8): B21D1/08B21D37/16
CPCB21D1/08B21D37/16
Inventor 孟庆磊孙宾张志李鹏亮陈福龙
Owner AVIC BEIJING AERONAUTICAL MFG TECH RES INST