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Technical |
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Rapid prototyping in mold manufacturing applications. |
RAPID TOOLING, RAPID TOOLING, hereinafter referred to as the RT) technology is developed rapidly with the development of RP technology and a new technology, its application ways are as follows: making mold, directly with the RP technology made by LOM system injection by surface treatment processing, its strength higher than ordinary wood, can be directly used for casting block; Using SLS and other methods, the wax model can be made directly.
There are two methods of using RP technology, namely direct method and indirect method.
The direct method
LOM method directly generated by the mold, can withstand the high temperature of 200 ℃, can be used as a low melting point alloy mold or molding wax pattern, also can use the block instead of sand mold casting.
The direct production of mold is still in the preliminary stage of research.
The indirect method
(1) make simple molds if the parts are small or used for trial production of the products, they can be made with relatively low cost of non-ferrous materials. RP technology is commonly used in this kind of mould making prototype parts, and then to flip on the prototype is made of silicone rubber mold, metal, resin mould or gypsum mould, or prototype parts for surface treatment, using metal spraying method or physical evaporation deposition coating a layer of low melting point alloy to make the mould.
In addition, there is a new process of pouring injection mold with chemical bond. The method is: using SLS or LOM method to make the mother mold; Using silicone rubber or polyurethane casting model; To remove the mother mold; The chemical bond ceramic model was cast by using silicon rubber or polyammonia cool model. 6. Solidification model cavity under 205 ℃; 6. Polishing; It is made into small batch injection mold for injection molding.
If the mold is cast in plaster cast, then cast aluminum, zinc and other non-ferrous alloy dies under vacuum conditions can also produce small batch injection molding products.
(2) make steel mould.
Ceramic precision casting method can be used in single production or small batch production of steel die. Its process is:
The prototype of the RP is modeled as a mother mold. Ceramic mortar; The solidified mold shell in the calciner; To burn the mother mold; Preheating module;
The casting steel cavity; All landowners polishing; To add pouring and cooling system; It is made into injection mold.
In the process of mass production of metal molds, the wax model is made by using the RP prototype, and then the wax mould is produced by using the moulding mould, and then the steel mould is made of the lost wax casting process. In the case of single production of complex dies, it is also possible to replace wax models directly with the RP prototype.
The steps of the method of using chemical bond steel powder casting cavity are as follows: Turn over silicone rubber or polyamine cool soft mould; The chemical bond steel powder cavity; Sintered steel powder; Copper carburizing treatment; And a polished cavity; It is made into injection mold.
The EDM electrode was made by using RP prototype, and then the steel mold was made by EDM. There are several methods for rapid electrode manufacturing.
The method of precision casting is made of metal copper deposited at 1:7 by electrolyte. The prototype surface is about 2-3mm thick and then removed.
Made of RP system prototype simply as a mould cavities quickly copy: using rapid prototyping molding processing parts as cavities can be copied out wax mold, silicone rubber mold, die or get together ammoniac cool die such as epoxy resin soft mould: soft mould and pouring of the epoxy resin, gypsum, ceramics, low melting point metal, metal matrix composites and other hard mould. These simple moulds can be used for casting mould, injection mold, wax mold forming die and drawing die etc., to realize small batch production of plastic parts or metal parts.
Using the quick prototype injection molding tool as the mother model, the electrode can be used to make the electric pulse machine quickly by means of metal spraying.
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