Thermal expansion method for titanium alloy flash welding collar piece

A technology of flash welding and titanium alloy, which is applied in the field of thermal expansion of titanium alloy flash welding ring parts, can solve the problems of roundness and poor dimensional accuracy of flash welding ring parts, and achieve the effect of improving dimensional accuracy

Active Publication Date: 2012-04-04
GUIZHOU ANDA AVIATION FORGING
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Problems solved by technology

Since this method relies on the flexible contact between the liquid and the inner peripheral surface of the ring to cold-expand the ring, it is only suitable for some materials with small deformation resistance, and its main function is to strengthen the ring. For materials with greater deformation resistance, such as Titanium alloys are not applicable; and this m...

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  • Thermal expansion method for titanium alloy flash welding collar piece
  • Thermal expansion method for titanium alloy flash welding collar piece
  • Thermal expansion method for titanium alloy flash welding collar piece

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[0042] The main chemical element content (percentage by weight) of the alloy is: Al content 5.5%-6.8%, V content 3.5%-4.5%, Fe content ≤ 0.30%, C content ≤ 0.10%, N content ≤ 0.05 %, H content ≤ 0.015%, O content ≤ 0.20%, the sum of other elements ≤ 0.40%, and the balance is Ti.

[0043] The structural diagram of the bulging machine for implementing the thermal bulging method of the present invention is as follows: figure 2 As shown, the bulging machine is mainly composed of a mandrel slider 1, a radial slider 2, a bulging block 3, a workbench 4 and a guide rail 5. The mandrel slider 1 is conical and is set in the radial slider 2 to cooperate with the conical inner peripheral surface of the radial slider 2. The mandrel slider 1 can be driven by the hydraulic cylinder of the bulging machine on the radial slider 2. Move up and down in the axial direction and squeeze the radial slider 2; the radial slider 2 is installed on the guide rail 5 of the bulging machine and can move ba...

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Abstract

The invention discloses a thermal expansion method for a titanium alloy flash welding collar piece, which comprises the following steps: heating an annealed titanium alloy flash welding collar piece, sleeving the titanium alloy flash welding collar piece on the periphery of a preheated expanding block in an expanding machine, and starting the expanding machine to allow the expanding block to press the collar piece radically from the internal circumferential surface of the collar piece to accomplish primary expansion, wherein the expansion temperature is 750 to 850 DEG C, the expansion time is 10 to 15 seconds, the pressure-keeping time is 8 to 9 seconds and the deformation rate is 0.1 to 0.15 percent; rotating the collar piece 45 DEG around a central axis to accomplish primary rotation; performing secondary expansion by the same operation, wherein the expansion temperature is 730 to 830 DEG C, the expansion time is 22 to 23 seconds, the pressure-keeping time is 18 to 20 seconds, and the deformation rate is 0.7 to 0.9 percent; rotating the collar piece in the same direction as the primary rotation to accomplish secondary rotation; and performing tertiary rotation by the same operation, wherein the expansion time is 700 to 800 DEG C, the expansion time is 33 to 43 seconds, the pressure-keeping time is 28 to 30 seconds and the deformation rate is 0.8 to 1 percent. The specification precision of the expanded collar piece can reach 0.1 to 0.2 of a corresponding specification, and the expanded collar piece is mainly used in the field of space navigation.

Description

technical field [0001] The invention relates to a bulging method for a ring, in particular to a thermal bulging method for a titanium alloy flash welding ring. Background technique [0002] After the titanium alloy flash welding ring is welded and formed, due to the influence of the welding process, the welded ring has a straight edge on its circumference, and the high stress of the ring after welding will cause the ring to warp and deform, resulting in It is in the shape of an irregular ring, and its dimensional accuracy is poor. In general, the welded ring can only be used after reaching the required size through a full circle. [0003] The Chinese invention patent specification CN 101367104A published on February 18, 2009 discloses a hydraulic bulging strengthening process for replenishing fluid outside the retaining ring of a turbogenerator. Then inject the closed space formed by the fixed upper cone mold, the moving lower cone mold and the retaining ring through the pa...

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Application Information

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IPC IPC(8): B21D31/04
Inventor 魏志坚段忠园周红王龙祥叶俊青陈强葛金峰
Owner GUIZHOU ANDA AVIATION FORGING
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