Method for preparing and constructing pipe die coating

Abstract

The invention discloses a method for preparing and constructing a pipe die coating and belongs to the technical field of centrifugal casting pipes. The method for preparing the pipe die coating mainly comprises the following steps: preparing mud, preparing a stock solution, preparing a sizing liquid and preparing a final coating. The method for constructing the pipe die coating mainly comprises the following steps: heating a pipe die, cleaning the pipe die and spraying paint. The method for preparing and constructing the pipe die coating has the beneficial effect that the coating with lower gas forming amount, higher strength, stronger suspension property and better demoulding performance is successfully developed by optimizing a coating preparation process; the forming acceptability and appearance quality of the pipe are improved by optimizing a coating construction process; the forming acceptability of the pipe is maintained to be about 99.5%; and the surface roughness of the pipe is below gradient 25.

Description

technical field [0001] The invention relates to the technical field of centrifugal casting pipes, in particular to the preparation and construction method of pipe mold paint. Background technique [0002] At present, the centrifugal casting pipe technology of hot mold method has been very mature, and has the outstanding advantages of low comprehensive production cost and high molding pass rate. Basically, all medium and large-sized ductile graphite casting pipes adopt this technology. Especially for large-diameter cast iron pipes, thermal molding is currently the mainstream production method in the market. The centrifugal casting method produces ductile iron pipes, and the most important part of the pipe forming process is the spraying of paint. [0003] After the paint is coated on the inner wall of the pipe mold, the roughness of the coating surface determines the appearance quality of the pipe. At present, the appearance quality of the pipe by the hot mold method is infe...

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Problems solved by technology

[0003] After the paint is coated on the inner wall of the pipe mold, the roughness of the coating surface determines the appearance quality of the pipe. At present, the appearance quality of the pipe by the hot mold method is worse than that of the cold mold method, but the cost of the cold mold method is higher

[0004] In addition, the preparation of the coating and its construction method also have a major impact on the forming of the pipe. If the appearance is too rough or air pockets are generated, it will directly lead to the failure of the forming, and all the cost of the previous process will be wasted.