Process for Preparing Type Plate Castings Containing Tubes by Embedding Stainless Steel Pipes

Abstract

The invention discloses a process for fabricating a template pipe-containing cast part in a manner of pre-embedding a stainless steel pipeline. The process comprises the following steps: 1) fabricating a wood pattern according to a drawing, and manufacturing a water outlet pipe groove in an inner cavity of the wood pattern; 2) selecting an appropriate sand box according to the wood pattern, and fabricating a sand mold of a lower box with the water pipe groove surface being upwards; 3) selecting an appropriate special upper box after finishing the sand mold of the lower box, fixing the upper box on the lower box, and then assembling an appropriate quantity of tooling bars into a track groove in a sand box; 4) fixing the tooling bars, and then beginning to fabricate a sand mold of the upper box; 5) bending a water pipe; 6) dividing the fabricated sand mold; 7) fixing the tooling bars with a stainless steel pipe, so that the periphery of the stainless steel pipe cannot directly contact the sand mold, and reserving a gap; 8) closing the boxes, and casting; and 9) solidifying and cooling a to-be-cast part, taking out the to-be-cast part, separating the upper box, and transporting the cast part to a cleaning region. According to the process disclosed by the invention, fastening and connection between the water pipe and the sand boxes are ensured, stress deformation of the stainless steel pipe caused by heating is removed, and thus not only is the geometrical tolerance of the water pipe ensured, but also the yield is improved.

Description

technical field [0001] The invention relates to the field of casting technology, in particular to a sand box device for fixing pre-embedded stainless steel pipes in the molded slab sand mold, and is especially suitable for the production of aluminum alloy household appliance molds containing the pipe-containing slab. Background technique [0002] The casting process of the existing household appliance mold billets is a green sand molding process; the household appliance molds are roughly divided into box type and type plate type, which are characterized by single casting, small batch size, large outline, external surface needs machining, and inner cavity In order not to process the surface; in the process of use, the mold needs to be heated by circulating water, which requires a heating pipe in the mold. There are currently two ways to place the heating pipe. One is that after the billet is formed, the casting Process the water pipe groove in the inner cavity of the blank, t...

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Problems solved by technology

[0002] The casting process of the existing household appliance mold billets is a green sand molding process; the household appliance molds are roughly divided into box type and type plate type, which are characterized by single casting, small batch size, large outline, external surface needs to be machined, and inner cavity In order not to process the surface; in the process of use, the mold needs to be heated by circulating water, which requires a heating pipe in the mold. There are currently two ways to place the heating pipe. One is that after the billet is formed, the casting Process the water pipe groove in the inner cavity of the billet, then put the water pipe into the groove, and then seal the pipe groove with a low-melting point alloy; It is laborious and costly, and the dimensional accuracy of the bent stainless steel pipe is high, otherwise it is not easy to put it into the processed pipe groove

The reason why copper tubes are used in this process is that copper tubes have little thermal deformation during casting and are easy to fix, but the disadvantages are that the cost of copper tubes is high, and the melting point of copper is low. When pouring, the copper tubes will be heated and softened or even cracked If the stainless steel water pipe is used, the stress deformation after heating is particularly large during the casting process, which is easy to cause displacement or deformation of the water pipe. Since the casting process is a wet sand molding process, the strength of the sand mold is poor. After the water pipe is deformed, the sand box Can cause damage and even collapse the box, resulting in the scrapping of the slab

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