High-precision machining tool and machining method for hemispherical titanium alloy welding part

Abstract

The high-precision machining tool comprises a base and a plurality of supporting seats, the supporting seats are arranged on the base and distributed around the center of the base, and arc-shaped notches are formed in the sides, close to the center of the base, of the supporting seats; the arc-shaped notches of all the supporting seats form a containing space used for containing the semispherical installing and welding piece, a plurality of sets of supporting adjusting bolts are distributed on the arc-shaped faces of the arc-shaped notches and arranged in the length direction of the arc-shaped faces, and the outer ends of the supporting adjusting bolts make contact with the semispherical installing and welding piece. And adjusting the space pose state of the hemispherical assembly welding piece to the position of the machining coordinate system. According to the scheme, the machining sequence is reasonably arranged according to the machining design of the large-specification hemispherical titanium alloy welding part, the machining tool is specially designed, and the machining problem of the large-specification high-precision hemispherical titanium alloy welding part is solved.

Description

technical field [0001] The invention belongs to the technical field of machining of metal structural parts, and in particular relates to a high-precision machining tool of a titanium alloy hemispherical welded part and a machining method thereof. Background technique [0002] In order to be able to withstand huge seawater pressure, the deep-sea manned cabin usually uses light, high-strength titanium alloy as its main material, and generally adopts a spherical structure, usually made of two hemispherical components by welding to form a whole spherical structure. Due to the large size of the manned cabin, the diameter can reach 2m, and the overall blank weight can reach 3.5t, the requirements for the overall true sphericity, control system interface and dimensional accuracy at the watertight hatch are extremely strict, and the titanium alloy itself is sticky to knives and thousands of The strength of megapascal level makes its machining very difficult. On the one hand, it must...

AI Technical Summary

Problems solved by technology

Due to the structure of the hole seat and connector for welding on the hemisphere in this project, the whole can only be processed by milling. Compared with the turning method, its precision control and processing parameters are more complicated, and the machining allowance of some positions is only 2mm, it is very difficult to level and find the reference

[0003] The prior art discloses a high-precision machining method for titanium alloy spherical shells, but the processing object is pure spherical without any welded components, and can be processed by turning, which is not suitable for welding hemispherical components in this project

In addition, in the literature and patent technology search, the predecessors have not found any relevant research reports on the processing methods and tooling of titanium alloy hemispherical weldments

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