Method and equipment for waste and old mold electromagnetic weld deposit repair and surface modification

Abstract

The invention relates to an electro-magnetism weld deposit renovation and surface modification method for waste and old dies, comprising following steps: cleaning and preheating the waste and old dies, performing weld deposit on the portion of the waste and old dies where renovation and surface modification are needed by using an arc source weld deposit method adding impulse shooting flow electrical arc controlled by an externally-applied magnetic field; treating the dies to achieve a needed technique requirement. The invented method breaks off the two limits contradictory with each other which are high melt covering ratio and low dilution ratio of weld deposit, realizes effective cooperativeness and reasonable unification of weld deposit quality and efficiency, reduces cost of weld deposit and dies, and improves competitive power; resolves the contradictory problem of high hardness and low flexility in waste and old dies renovation field; protects electro-magnetism weld deposit novel heat source by using impulse revolving shooting flow gas innovationally, renovates the waste and old dies by utilizing characteristics of high efficiency, high quality, distortion and controllable temperature of the electrical arc heat source. The invention provides the related device also.

Description

technical field [0001] The invention relates to the field of mold repair and modification engineering, in particular to a new method and equipment for surfacing repair and modification in the recycling and remanufacturing process of waste molds, in particular to pulse rotating jet gas protection electromagnetic surfacing repair and surface modification of waste molds. Sexual methods and equipment. Background technique [0002] Mold is widely used in the manufacturing industry, which directly affects the quality of products. It is one of the key and controlling links to ensure product quality and precision, product manufacturing speed and product cost. Its model design, material selection and production process requirements Higher, so the manufacturing cost of the mold is also higher. Because the mold needs to be used repeatedly, there must be wear and tear, and there may be damage during use to make the mold a waste product. A set of molds ranging from a few kilograms to t...

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Problems solved by technology

At present, many patent application documents have been disclosed about the methods for repairing and surface modification of waste molds: such as the Chinese patent "Mold Repairing Method and Repairing Machine" (application number 94108743.3), which uses controllable pulse electric energy to turn the patch The material is fixedly connected to the repairing part of the tool and mold, and successively multi-layered and superimposed to form a blank, and then repaired and restored to the working surface. This method is more cumbersome than the process, the efficiency is not high, and it is not easy to be popularized and applied; the Chinese patent "Metal Fusion Filling Repair Technology" (Application No.: 02104351.5), which uses adjustable high current (1900-4200A) to melt metal balls or rods of different specifications in a short time (0.5-2.5s) and press-weld to fill them on the surface of parts or molds In the damaged part, the metallurgical bond between the repair welding material and the base material is achieved. This method uses instantaneous high current, which has a great impact on the power grid and is not energy-saving; Chinese patent "a welding process for repairing molds" (application number: 200310106328.3) , it is a welding process for repairing molds with excessive wear or cracks. Using a spray welding gun, alloy powder and oxy-acetylene are mixed and burned, and alloy powder is sprayed on the surface of the mold to be processed as a base powder. Reheat the alloy powder bottom powder, and spray the alloy powder, so that the alloy powder and the mold are melted and integrated. This method has poor bonding strength, is difficult to control, and has limited performance improvement; the Chinese patent "method for surface modification and repair of tools and molds" ( The application number is: 200510018292.2), which not only takes advantage of the high efficiency and low cost of the spray method, but also retains the advantages of the laser cladding method to form a metallurgical bond between the coating material on the surface of the substrate and the substrate, and adopts multi-axis CNC processing technology. Obtain tool and mold surface treatment layers with different properties and complex shapes, but the equipment used is expensive and the process is complicated, which increases the cost of mold repair or surface modification

[0003] At present, there are the following difficulties in realizing the remanufacturing of waste molds: (1) the dilemma of high deposition rate and low dilution rate in the field of surfacing and remanufacturing of waste molds; (2) the high hardness and low toughness in the field of remanufacturing of waste molds plastic paradox

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