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Flanging method and flanging device for conical holes of titanium and titanium alloy plates

A titanium alloy and tapered hole technology, which is applied in the field of metal forming, can solve the problems of easy cracking of materials and lack of back pressure stress in metals, and achieve the effects of ensuring weld quality, improving metal stress state, and uniform wall thickness

Active Publication Date: 2016-09-21
ZHEJIANG SHENJI TITANIUM IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] Aiming at the lack of back pressure stress of the metal in the flanging area in the prior art, which cannot solve the problem that the material is easy to crack during flanging, the present invention proposes a flanging method and device for tapered holes in titanium and titanium alloy plates, which can increase the conical The back pressure stress of the plate in the flanging area solves the problem that the material is easy to crack when flanging, and at the same time makes the welding of the two parts precise butt joint, ensuring the quality of the weld seam

Method used

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  • Flanging method and flanging device for conical holes of titanium and titanium alloy plates
  • Flanging method and flanging device for conical holes of titanium and titanium alloy plates
  • Flanging method and flanging device for conical holes of titanium and titanium alloy plates

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Embodiment 1

[0025] This embodiment relates to a method for flanging a tapered hole in a titanium and titanium alloy plate, comprising the following steps:

[0026] S 1 , processing of prefabricated holes 12: the plate 1 is annealed and then cleaned with acid and alkali, then dried, cut, and prepunched to obtain prefabricated holes 12;

[0027] S 2 , Boss 5 processing: After obtaining the prefabricated hole 12, the plate 1 is installed on the first station of the general hydraulic press, the jacking pipe 4 is installed on the upper mold of the first station, and the first conical punch 3 is installed on the first station. Lower mold, such as figure 2 As shown, the prefabricated hole 12 is set corresponding to the jacking pipe 4 and the first tapered punch 3; the universal hydraulic press is started, and the slider is lowered to drive the jacking pipe 4 to press down to pre-turn the edge of the prefabricated hole 12 to form the pre-turning hole 2. During the pre-turning process, the fir...

Embodiment 2

[0042] The difference from Example 1 is that in this example:

[0043] The grade of the plate 1 is titanium alloy TC4, with a thickness of 1 mm and a diameter of Hot flanging after pre-flanging to form a tapered boss 5;

[0044] The material of the first tapered punch is cold die steel Cr12MoV with a heat treatment hardness of 58-62HRC, and the material of the second tapered punch is hot die steel H13 with a heat treatment hardness of 48-52HRC.

[0045] The hot-state flanging processing refers to: the pre-turned plate 1 is sprayed with FR-6 glass lubricant, which has protective lubrication performance in the range of 400-1800°C. After drying, put it into an electric roller furnace and heat it to 700°C and keep it warm for 16 minutes, then immediately move to the second station, and process the tapered hole boss 5 on the plate 1 at high temperature; The pressure applied by the copper conduit not only exerts a back pressure in the deformation area of ​​the two, but also defor...

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Abstract

The invention discloses a flanging method and a flanging device for conical holes of titanium and titanium alloy plates in the technical field of metal forming. The flanging method comprises the following steps: pre-treating the titanium and titanium alloy plates to facilitate machining for prefabricated holes; after the prefabricated holes are machined, pre-bending the edges of the prefabricated holes through the interaction of a first conical convex die and jacking tubes; and then producing the conical holes through the interaction of a second conical convex die and guide tube parts. According to the flanging method and the flanging device, which are disclosed by the invention, the flanging quality is improved, the material loss is reduced, and the feasibility of flanging is increased to 1.5-2 times in a cold state and is higher in a heat state; and the wall thickness of the conical holes of the parts after flanging is uniform, diameters at welds are expanded, the conical holes of the guide tube parts and the conical holes of the plates are synchronously formed, and welding seams are bonded better, thus the quality of the welding seams is ensured.

Description

technical field [0001] The invention relates to a technology in the field of metal forming, in particular to a method and device for flanging a tapered hole in a titanium and titanium alloy plate. Background technique [0002] Flanging forming is a forming process in which convex and concave dies use tensile and compressive forces to form bosses or to form vertical bosses around prefabricated holes. The round hole flanging process is widely used in sheet metal forming in the automotive, aerospace and aviation industries. In recent years, in the aircraft manufacturing industry, whether it is a civil aircraft or a military aircraft, the use of titanium has doubled due to its outstanding advantages. For example, in the field of civil aviation, the United States has increased by 4 times from 3% of Boeing 707 titanium alloys in the 1950s to 15% of Boeing 787 in 2010, and the consumption of titanium alloys in the airliner MS-21 being developed in Russia is as high as 25%. The amo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B21D19/00
CPCB21D19/00
Inventor 陈修琳袁秦峰陈岩
Owner ZHEJIANG SHENJI TITANIUM IND