Protection device and method for additive manufacturing of titanium and titanium alloys based on welding process

Abstract

A protection device and method for additive manufacturing of titanium and titanium alloys based on a welding process, which includes a protection tow cover, an upper protection base and a lower protection base arranged in sequence from top to bottom; the protection tow cover is a A rectangular cover body with an open bottom, the open bottom surface is covered with a layer of copper mesh; the top surface of the cover body is provided with a welding torch port and an air supply channel port, and a welding torch buckle for clamping the welding torch is provided around the welding torch port; The protective base is a rectangular plate, and the upper surface of the plate is provided with a long groove-shaped welding channel corresponding to the position of the welding torch mouth. A plurality of water-cooling channels; the lower surface of the plate protrudes from a rectangular stepped portion; the lower protective base is a rectangular frame with a sealed bottom, and the shape and size of the inner wall of the frame correspond to the shape and size of the outer wall of the stepped portion, so that The upper protection base is buckled in the lower protection base through the stepped portion; the side of the frame is provided with a protection gas inlet hole.

Description

technical field [0001] The invention belongs to the technical field of additive manufacturing and welding technology protection devices, in particular to a protection device and method for additive manufacturing of titanium and titanium alloys based on welding technology. Background technique [0002] Titanium and titanium alloys have excellent characteristics such as high melting point, non-magnetic, low thermal expansion coefficient, high specific strength and specific stiffness, good corrosion resistance and good biocompatibility, and are mainly used in aerospace, petrochemical, nuclear Industry, ships, automobiles and other major industrial components. However, the widespread use of titanium and titanium alloys is constrained by their cost and the difficulty of manufacturing processes. On the one hand, due to the low thermal conductivity of titanium and titanium alloys, it is easy to generate heat accumulation during processing and soften the tool; especially titanium h...

AI Technical Summary

Problems solved by technology

However, the protection of traditional welded titanium and titanium alloys is only for single straight lines, multi-line straight lines or simple geometric paths. Additive manufacturing is based on the size requirements of the manufactured parts, and the required parts are formed layer by layer. The size of the parts involved is uncertain and the shape of the parts is uncertain. Arc and straight line interaction usually requires robots to participate in the manufacturing, and the protection range needs a certain range to be effectively protected; on the other hand, the additive manufacturing process of titanium and titanium alloys accumulates layer by layer, the heat accumulation lasts for a long time, and the vertical height dissipates slowly , resulting in a long duration of high temperature (>300°C) in the height direction of the additive material, which is extremely easy to cause oxidation of the manufactured parts, and the use of ordinary single-movement welding protective drag hoods is no longer applicable

If the overall vacuum chamber is implemented or the inert gas protection is passed into the manufacturing chamber, the cost is too high, and additive manufacturing is usually manufactured by robots, which requires a large space and the movement path of the robot is limited, which is not conducive to the manufacture of parts

[0004] Therefore, the traditional welded titanium and titanium alloy protective drag cover cannot effectively protect the direction of additive manufacturing, while the vacuum chamber or protective chamber additive manufacturing of titanium and titanium alloy has too large protection range and high cost, and additive manufacturing robots Problems such as limited movement paths need to be resolved urgently

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