JINAN WELTOP MACHINERY EQUIPMENT CO.,LTD.

Sand casting, the most widely used casting process, utilizes expendable sand molds to form complex metal parts that can be made of nearly any alloy. Because the sand mold must be destroyed in order to remove the part, called the casting, sand casting typically has a low production rate.T he sand casting process involves the use of a furnace, metal, pattern, and sand mold. The metal is melted in the furnace and then ladled and poured into the cavity of the sand mold, which is formed by the pattern. The sand mold separates along a parting line and the solidified casting can be removed. The steps in this process are described in greater detail in the next section.

Low-pressure sand casting machine consists of two pieces: holding furnace and liquid surface pressure control system. The furnace cover of holding furnace is used for work table for sand box. The prepared sand box fixed on the cover of holding furnace directly and then pressure casting. Fluid surface forcing control system adopts the high performance proportional valve +precision pressure sensors，which can examine the pressure of holding furnace and control real-time and closed loop feedback by PID accommodation mode. The system has multi-linear pressure, leakage compensation for holding furnace and leakage compensation for liquid surface. The setting add-pressure craft’s curve can be tracked automatically. High precision control of pressure ensures the low press die casting process stable properties and good consistency.