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

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...

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 surface and the side surface , but the size of the arc cannot be precisely controlled, R2 can only be selected according to the process characteristics of chemical corrosion, and after chemical corrosion, due to the inhomogeneity of the chemical reaction, the corrosion edge is uneven, the fatigue stability is poor, and the time for chemical corrosion , temperature, drug dosage and other requirements are relatively strict and difficult to control, and there is a certain pollution to the surrounding environment, which is harmful to the physical and mental health of the operators.

Images