Special sand box for plate type tube-containing castings

Abstract

The invention provides a special sand box for plate type tube-containing castings. The special sand box comprises a lower box and an upper box matched with the lower box, wherein the upper box is fixed on the top of the lower box; a wooden mold is arranged in the upper box; a water tube seat is arranged in the inner cavity of the wooden model; a stainless steel tube is arranged in the water tube seat; a rail groove is formed in the upper part of the upper box; a tool rod is connected to the wooden mold and located directly above the water tube seat; the head of the fixture rod is fixed directly above the water tube seat and contacts with the water tube seat; a slider is arranged on the rail groove; the tail of the tool rod is in threaded connection with the slider; a threaded hole is formed in the slider; the slider is fixed on the rail groove of the sand box by use of a fixing screw via the threaded hole; a fixing screw with a tying wire with the diameter of 1mm penetrates through the head of the tool rod, a gap of 3-5mm is reserved between the end portion of the fixing screw and the head of the tool rod, and after the bent stainless steel tube is placed in position, the stainless steel tube is fixed by use of the tying wire on the fixing screw. The special sand box for plate type tube-containing castings is capable of achieving the purpose of replacing a red copper tube with the stainless steel tube; as the price of the stainless steel tube is about 1 / 3 of that of the red copper tube, the cost is saved.

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...

AI Technical Summary

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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