Fluid sand mould centre spinning method

Abstract

A flow-state sand mold centrifugal casting method comprises the following steps of: preparing a flowable, semi-liquid or mud-like refractory die material; pouring the refractory die material in inner walls of a cylindrical metal sand box; rotating slowly to form uniform radial distribution, and increasing the rotation speed of the die, so that the refractory die material forms a uniform sleeve on the inner surface of the sand box; squeezing most of water of the refractory die material by the rotation centrifugal force of the cylindrical metal sand box to form a uniform and dense refractory die, which is coaxial with the rotation belt of the sand box; discharging excessive water from the inner side of the die; and drying or baking the wet sand die to form a dense and hard sand die with preset thickness in the metal sand box, and centrifugally casting molten steel.

Description

Technical field: [0001] The invention belongs to a new type of casting technology in metal centrifugal casting, which combines the advantages of other casting forms and can be applied to large-scale batch production. Background technique: [0002] At present, the vast majority of production units in metal centrifugal casting adopt two main manufacturing methods - the production method formed by metal molds and the use of sand (lining) molds. According to the requirements of these two casting types in similar application fields, both production methods successfully meet the needs of the industrial market, but both methods have obvious advantages and disadvantages, which are briefly summarized as follows: [0003] The advantages of the metal mold method are: 1) rapid solidification to form high-quality crystals and uniform particle distribution; 2) increased output of centrifugal casting machines due to rapid solidification; 3) strict control of dimensional tolerances due to t...

AI Technical Summary

Problems solved by technology

[0008] The purpose of the present invention is: in order to eliminate the shortcomings of using metal molds or sand (liner) molds for centrifugal casting in the above traditional production, especially solve the problems that are easy to occur when using metal molds or sand (liner) molds in traditional production methods and production instability, a fluid sand mold centrifugal casting method is proposed, which can ensure the concentricity of the mold surface inside the sand box; the diameter of the cast pipe can be changed steplessly and without limitation, which is convenient for the production of steel pipes or alloy pipes of series sizes, and forms products Variety of specifications; harder, denser and more uniform than traditional mold making; solve the most difficult problems of traditional metal mold production methods, and eliminate hot tearing and cracking

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