Adjustable trailing gas protection cover for manufacturing electric arc additional material and use method of adjustable trailing gas protection cover

A technology of additive manufacturing and protective cover, applied in the direction of manufacturing tools, additive processing, arc welding equipment, etc., can solve the problems affecting the formation of stacked layers, arc and molten pool instability, etc., to improve quality, maintain stability, Avoid oxidative effects

Pending Publication Date: 2019-06-21
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the consequence of increasing the air flow is the instability of the arc an

Method used

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  • Adjustable trailing gas protection cover for manufacturing electric arc additional material and use method of adjustable trailing gas protection cover
  • Adjustable trailing gas protection cover for manufacturing electric arc additional material and use method of adjustable trailing gas protection cover
  • Adjustable trailing gas protection cover for manufacturing electric arc additional material and use method of adjustable trailing gas protection cover

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Experimental program
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Effect test

Embodiment 1

[0029] An adjustable trailing gas shield for arc additive manufacturing, comprising a welding torch sleeve 1, an inner shield 2 and an outer shield 3;

[0030] The inner protective cover includes a front panel, a rear panel, an upper panel and end panels on both sides, and the five panels form a cuboid structure with an open bottom, and a welding torch sleeve is arranged on one end panel of the inner protective cover. The welding torch sleeve is a cylindrical structure with both upper and lower openings; the end panel on the side where the inner protective cover is connected to the welding torch sleeve is arc-shaped to fit the cylindrical outer wall of the welding torch sleeve.

[0031] The inner protective cover is provided with a fixing device 4 for connecting with the welding torch, and the upper panel of the inner protective cover is provided with two intake nuts for connecting with the shielding gas intake pipe; one is close to the welding torch, and the other is far away ...

Embodiment 2

[0036] On the basis of Embodiment 1, the fixing device is composed of connecting rods and connecting pieces (such as figure 2 shown), the connecting piece is fixedly connected to the welding torch or the mechanical arm holding the welding torch, and the connecting rod is arranged between the connecting piece and the upper panel of the inner protective cover. Before arc addition, the connecting piece of the fixing device is connected and fixed with the welding torch or the mechanical arm holding the welding torch, so that the inner protective cover can move horizontally or vertically with the welding torch.

Embodiment 3

[0038] On the basis of the above-mentioned embodiment 1, the inside of the inner protective cover is provided with a metal screen along the horizontal direction (such as image 3 shown) to distribute the shielding gas evenly. The metal screen is a pure copper screen with a mesh diameter of 0.1 mm and a hole pitch of 0.2 mm; when the arc is added, the shielding gas passes through the air inlet in turn, and the metal screen reaches the substrate. The metal screen plays the role of buffering and dispersing the gas, so as to prevent the excessive gas flow from disturbing the arc and the molten pool.

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Abstract

The invention discloses an adjustable trailing gas protection cover for manufacturing an electric arc additional material and a use method of the adjustable trailing gas protection cover. The protection cover comprises a welding gun sleeve, an inner protection cover body and an outer protection cover body. A welding gun is constantly lifted in the direction perpendicular to a substrate in the electric arc additional material manufacturing process, and consequently the distance between the protection cover and the substrate is constantly increased. By arranging the outer protection cover body outside the inner protection cover body, active metal is always kept in a shielding gas environment in the process that the welding gun is away from the surface of the active metal, the stability of anelectric arc and a weld pool is kept, titanium and aluminum are prevented from being oxidized in the additional material process, and the quality of accumulative formation metal is improved.

Description

technical field [0001] The invention belongs to arc additive manufacturing equipment, in particular to an adjustable trailing gas protective cover for arc additive manufacturing. Background technique [0002] Additive manufacturing technology is a new type of mechanical manufacturing technology. By using computer software to layer parts, powder or wire is accumulated layer by layer according to a pre-designed path to form parts. Arc additive manufacturing technology is an important branch of additive manufacturing technology. It uses electric arc as heat source, metal wire as raw material, and uses robot arm to control walking path for additive manufacturing. Titanium alloys and aluminum alloys are commonly used raw materials. However, as active metals, titanium and aluminum alloys can easily react with elements such as oxygen, hydrogen, and nitrogen at high temperatures. In particular, the reaction of titanium alloy with oxygen will greatly reduce the plasticity and tough...

Claims

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Application Information

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IPC IPC(8): B23K9/32B23K9/04B33Y40/00
Inventor 杨振文刘齐张萌许博王颖王东坡李会军
Owner TIANJIN UNIV
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