Explanation

foundry method of the manufacturing thin shell mold by contacting resin coated sand with the preheated metal template. The metal template is preheated, and resin sand is evenly sprayed on the template. The thermosetting resin in the molding sand close to the template is rapidly bating and flows after being heated, and the sand particles are bonded. After further heating, the resin curing, so as to form a thin shell mold that is exactly the same as the pattern contour. The thickness of shell mold is determined by the amount of resin sand sprayed or the residence time of molding sand on the formwork. After the hardened two half shell molds are assembled by bonding method, they are placed in a sand box, and the surrounding areas are filled with dry sand or steel shot to be casting. The thickness of shell mold is generally several millimeters or more than ten millimeters, which is light and easy to handle. The amount of sand used is less, about 1/1 O-1/5 of that of ordinary sand mold. The sand box is also smaller than that of ordinary foundry methods. shell mold casting is characterized by accurate casting size and smooth surface, which is suitable for mass production of small and medium-sized pieces of various metals. Sometimes water glass sand is also used to make shell mold.

Classification