Something with a vacuum molding
A sand casting or a sand molded casting is a cast part produced by forming a mold from a sand mixture and pouring molten liquid metal into the cavity in the mold. The mold is then cooled until the metal has solidified. In the last stage the casting is separated from the mold. It sounds that the producing of a sand casting is simple and easy operated. However, it does not. We must have realized that the mold is significant in the producing process. There are many alternative molds are applied in producing process. Among the various variations of the sand casting process is vacuum molding.
Molding is a process used in manufacturing to shape materials. Vacuum molding is a kind of sand casting process generally expected for most ferrous and non-ferrous metals, in which unbonded sand is held in the flask with a vacuum. The flask is a special vacuum forming flask which is placed over the plastic pattern. And the sand it put to fill the flask.
Why does vacuum molding be popular? The followings maybe give you some answers. Vacuum molding equals to V-process, whose plastic film has a certain degree of lubricity. Thus, it is able to expand slightly when the vacuum is drawn in the flask. Furthermore, no moisture related defects, no cost for binders, excellent sand permeability, and no toxic fumes from burning the binders lead it to be popular and outstanding among various variations. What else, the detachment of the sand enables the pattern not to wear out. However, apart from the above advantages, there is major disadvantage that people should endeavor to overcome. It is that the process is slower than traditional sand casting. Thus, it is only suitable for low to medium production volumes; approximately 10 to 15,000 pieces a year.
With the quick development of the molding industry, we are benefit from it. The working efficiency and producing specifications are extensively improved and regulated. It is wise to make full use of the advantages and be creative to come up with some ideas to improve the weakness It is reported that the molding tool market total amount of world has been keep in recent years at 60,000,000,000~ of USD 65,000,000,000. In other words, it shows a bright future for molding industry.
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Questions and Answers
Permanent mold casting is a metal casting process in which metals and not sand is used as the mold material. Typically, cast iron, aluminum, copper alloys, zinc, tin and steel are used as the mold material in permanent mold casting
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