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178. Model technical characteristics, steps commonly used material, material properties?

Rapid prototyping technology can not only adapt to a variety of production types, especially single and small quantities of mold, and can adapt to the complexity of the mold manufacturing.

Features: molded silicone mold is simple and does not require high-pressure injection machines and other specialized equipment, stripping easy. A silicone mold to manufacture about 20 parts. Generally cast in a vacuum to remove air bubbles. The main advantage of silica gel, low cost, many materials can be molded with silicone, suitable for wax, resin, plaster casting molding, casting wax model is widely used in the production of generic art and production preparation. The main disadvantage of silicone mold tooling slow, silicone normally takes 24 hours to cure, to shorten this time, you can pre-heating of raw materials, the time in half. Reaction injection mold is designed for the shortcomings of their shells. It uses automatic mixture of rapidly solidified materials, methods, and use a single mold, the system of 20-40 pieces a day, if the use of multiple sets of molds, production will be greatly increased. Common materials: room temperature vulcanizing silicone rubber, silicone rubber mold, but many types of RTV used to have the following characteristics, elongation and tear strength is particularly high, excellent compatibility with the original mold, for most chemicals, has an excellent ability to endure, only to have the above characteristics of RTV have longer tool life and lower tooling costs (1) TE-1089 silicone rubber, How are two-component silicone rubber, has excellent flexibility, strong anti- tear strength, and high temperature, chemical resistance. (2) methyl vinyl silicone rubber, high temperature, low temperature flexibility, weather resistance, excellent electrical properties, excellent mechanical properties, chemical resistance properties, permeability, physical inertia. (3) RTV358, is a non-transparent RTV silicone rubber, which joined the curing agent at 25 degrees, 24 hours after the initial solidified into a flexible body. (4) RTV141, is a transparent RTV silicone rubber, which joined the curing agent at 25 degrees, after 24-48 hours after the initial solidified into a flexible body. (5) TEKSIL high temperature vulcanized silicone rubber, RTV silicone rubber than yo better performance, hardness HSA55-75, tensile strength 12.4-62.1MPA, working temperature can reach 150-500 degrees. (6) polyurethane resins and engineering plastics, are the three polyurethane resin SG95, SG200, 2170 with three plastic ABS, Nylon6, polypropylene PP performance.