Titanium alloy sheet heat stretching forming tooling and forming method

Abstract

The invention belongs to the technical field of plastic forming machining and relates to a titanium alloy sheet heat stretching forming tooling and a forming method. The device comprises a bottom plate, triangular supports, clamps, main shafts, three-segment spacer sleeves, buckles and a stretching half die. The triangular supports are symmetrically arranged on the two sides of the bottom plate, horizontal right-angle sides of the triangular supports are in threaded connection with the bottom plate, and vertical right-angle sides of the triangular supports and the main shafts are mounted in amatched mode; the middles of the vertical right-angle sides are fixedly connected with the three-segment spacer sleeves correspondingly; the buckles can rotate around the corresponding main shafts; the two ends of the clamps are in bolt connection with ear plates of the buckles correspondingly; the ends of sheet metal are clamped into the clamps; and the lower end of the stretching half die is provided with a terrace die body with double degrees of curvature, the half die moves downwards to be attached to the sheet metal, and heat stretching forming of the sheet metal is achieved. According tothe titanium alloy sheet heat stretching forming tooling and the forming method, half die forming is adopted, the number of the forming dies is decreased by half, and the clamps are universal; the forming precision is improved, the resilience value is reduced, and thickness reduction is controlled; and tedious procedures such as heat treatment are omitted, links are controlled to be simplified, energy and material wasting is reduced, the development period is shortened, and the product quality stability is improved.

Description

technical field [0001] The invention belongs to the technical field of plastic forming processing, and relates to a thermal stretching forming tool and a forming method of a titanium alloy plate. Background technique [0002] Titanium alloys can play an important role in reducing the weight of the overall structure of the aircraft, improving the efficiency of structural design, improving the reliability of the structure, increasing the life of the airframe, meeting the requirements of high temperature and high load, and corrosive environments. Titanium alloys are difficult to form in a cold state, so isothermal hot forming and superplastic forming processes are often used, but for such figure 1 The complex shape and double curvature of the titanium alloy skin part shown in the figure, the problems in the forming include: [0003] (1) If isothermal thermoforming is used, that is, stamping or deep drawing in a hot state, all of which are formed by rigid molds, and the materia...

AI Technical Summary

Problems solved by technology

The entire processing cycle is long, the quality stability is not easy to control, and the cost is high

[0005] (3) The use of superplastic forming will cause the local thinning rate to be too high

Superplastic forming has its own advantages, but the control of thinning rate is still a technical difficulty

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