The casting of pump valve is preferred in the process of production, mainly because of the low cost, simple production process and short production cycle. Therefore, the automobile engine cylinder block, cylinder head, crankshaft and other castings are made of clay wet sand molding process.
Pump valve castings in use can also effectively using the resin self-hardening sand mould and steel to some extent can effectively use the sodium silicate sand mold to production, so we can get to a certain extent size precision, smooth surface castings.
Pump valve castings in production is if use the investment casting, in the process of producing mainly refers to the effective with fusible materials made of meltability model, can be effective in the process of operating in the coated with several layers of tailor-made refractory coating, after drying and hardening type to form a whole shell, reoccupy steam or hot water from the melt in the shell model, and then put type shells in the sand box.
Around the pump valve castings in a certain extent in dry sand filling model, when making use of the final will be cast into the furnace by high temperature roasting, cast type or shell after roasting, and are casting in pouring molten metal. The precision and complexity of the precision casting is close to the final shape of the parts, which is not processed or seldom processed.
Pump valve castings in a certain extent is a kind of advanced net-shape forming technology, in the process of operating is an excellent technology, casting industry in the use of very broad, in use is not only applicable to the various types, various kinds of alloy casting, and produce the casting dimension accuracy and surface quality higher than other casting methods, or even other casting method is difficult to cast the complex, high temperature resistant, not easy machining castings, all can be used for investment casting precision casting. At present, the world's precision casting process is developing rapidly and widely.http://www.pump-casting.com/