Special welding machine system for rapid metal forming through electric arc method and control method of special welding machine system

Abstract

The invention relates to a special welding machine system for rapid metal forming through an electric arc method and a control method of the special welding machine system. The system comprises a controller, a rack, an electric arc power source, a wire feeding assembly and a voltage comparison device. A metal wire is arranged in the wire feeding assembly. A three-dimensional movement device is arranged on the rack. A welding gun head and a welding bottom plate which are connected with the wire feeding assembly are respectively arranged on the three-dimensional movement device. The metal wire penetrates into the welding gun head. The welding gun head and the welding bottom plate are electrically connected with the electric arc power source. The voltage comparison device is provided with a first voltage detection end, a second voltage detection end and a delay switch. The first voltage detection end is electrically connected with the welding gun head. The second voltage detection end iselectrically connected with the welding bottom plate. The delay switch is connected into a connecting line of the welding gun head and the electric arc power source in series or connected into a connecting line of the welding bottom plate and the electric arc power source in series. The system is adopted in the control method. According to the special welding machine system for rapid metal formingthrough the electric arc method and the control method of the special welding machine system, transient short-circuit time is controlled through the voltage comparison device, heat accumulation is reduced, and the problem of thermal stress is avoided.

Description

technical field [0001] The invention relates to a special welding machine system for metal rapid prototyping by arc method and a control method thereof, belonging to the technical field of rapid metal printing and prototyping. Background technique [0002] As far as the applicant knows, metal rapid printing and prototyping technology is a digital manufacturing technology that uses high-energy beams as a heat source and accumulates materials layer by layer to realize moldless forming of components. The principle of rapid printing and forming of metal parts is to melt and accumulate metal powder or wire under heating conditions such as electric arc, laser or electron beam, according to the path set by the software, and finally form the designed part entity. [0003] The proportion of the application of large and complex key structural parts in the world's manufacturing industry has become an important technical indicator to measure the advancement of major equipment such as mi...

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Problems solved by technology

However, the temperature control method of the molding substrate used in this technical solution is actually difficult to solve the thermal stress problem mentioned above. This method can at most eliminate a certain amount of thermal stress on the printing line segment in one direction. For 3D printing, It is impossible to have only one direction in the printing direction. The plane of 3D printing is a complex plane figure. Obviously, this method cannot eliminate the thermal stress in all directions in the plane; The support of the lower layer, the means is actually difficult to solve

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