Manufacturing method of titanium or titanium alloy thin-wall ball shell

Abstract

The invention provides a manufacturing method of a titanium or titanium alloy thin-wall ball shell. The method includes the procedures of laying-off, plastic molding, groove machining, welding and nondestructive detection. During plastic molding, an assembly is formed in the manner that a ball shell plate is coated with two steel plates, a coating thermal molding process for thermoplastic moldingis carried out, temperature distribution during thermal pressing of the ball shell plate can be more uniform, the cooling speed of the ball shell plate can be effectively reduced, the pressing plasticity of the ball shell plate is improved, the pressing resistance is reduced, pits, bulges and the like generated in the molding process of the ball shell plate are avoided, the plastic deformation residual stress is small, the resilience value is small, and the dimensional precision of the obtained half-ball shell is greatly improved. In the welding process, the distances between a welding position and the top end of the ring surface of a weld joint and between the welding position and the bottom end of the ring surface of the weld joint are equal, in other words, the welding position is located in the middle of the circumferential direction of the ring surface of the weld joint instead of the top end of the ring surface of the weld joint, and therefore the phenomenon of oxidation of the back face of the weld joint can be completely avoided. Thus, the problem about manufacturing of the titanium thin-wall ball shell can be well solved.

Description

technical field [0001] The invention belongs to the technical field of metal spherical shell manufacturing, and in particular relates to a manufacturing method of a titanium or titanium alloy thin-walled spherical shell. Background technique [0002] Titanium and titanium alloys have many advantages such as low density, high specific strength, excellent corrosion resistance, and high heat resistance. In recent years, they have become an important structural metal and are widely used in aerospace, marine engineering, energy and chemical industries, and automobile manufacturing. each field. [0003] The density of titanium and titanium alloys is only 60% of that of steel, but its strength has reached the strength level of many alloy steels. Therefore, people have gradually begun to use titanium and titanium alloys to manufacture aircraft storage tanks and pressure vessels that have a strong demand for weight reduction. and other products. In order to realize the fire extingu...

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Problems solved by technology

[0004] The manufacturing method of the metal thin-walled spherical shell structure is more complicated than other types of structural parts. In addition, titanium and titanium alloys have unique physical and chemical properties, and the manufacturability is poor. The existing production process of metal thin-walled spherical shells cannot fully meet the requirements of titanium and titanium alloys. The manufacturing requirements of thin-walled spherical shells, such as: the manufacturing process of spherical shells involves the plastic processing process of hemispherical shells. Titanium and titanium alloys have the characteristics of poor plasticity and large springback, so it is difficult to obtain hemispheres with high dimensional accuracy by conventional metal plastic processing methods Shell; Titanium has lively chemical properties and is easily oxidized at high temperature. When welding the hemispherical shell, it is necessary to protect the weld seam with inert gas. Due to the limitation of the structure, it is difficult to completely discharge the air in the shell when welding the spherical shell. Residual air will cause high temperature oxidation of the weld, deteriorating the weld performance, so the welding quality is poor

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