Low pressure, a common word in life. It is used for both living and living. In the foundry industry, it is the formation of a mold. In low-pressure casting, the mold is placed on a closed holding furnace, and the cavity passes through the liquid-liquid passage in the furnace through the riser. During operation, pressurized air is added to the furnace, and the molten metal flows into the cavity from the riser. After the molten metal solidifies, the compressed air in the furnace is released, and the unsolidified metal flows back from the riser to the furnace. The aluminum wheel and blade in the torque converter movement have four major advantages: low pressure, compact structure and good mechanical properties. Secondly, the production rate is high. At present, the production rate of die castings in our foundry is More than 93%, the same product gravity casting process yield rate of 70% ~ 80%; Third, the production efficiency is high, the same product die casting process production efficiency is three times gravity casting; Fourth, the surface is smooth, can reduce processing margin.
Production Process
⊙ mold inspection
⊙ baking mold
⊙ paint - lower core
⊙Set process parameters
Pouring
Casting common defects and treatment methods
One: The cause of the bonfire caused by the bonfire: the mold temperature is low; the exhaust is not smooth; the filling rate is too fast.
Solution: Increase the temperature of the mold to above 350 °C; strengthen the exhaust, mainly to increase the venting plug, and spray the paint with good permeability; increase the filling time, so that the cavity gas can be completely discharged.
Two: sticky sand The reason for sand sticking: the pouring temperature is too high; the strength of the sand core is insufficient; the holding pressure is too high.
Solution: The pouring temperature of aluminum liquid is not higher than 670 °C; reduce the baking time of sand core, maintain the strength of sand core; set reasonable pressure holding pressure.
III: Insufficient pouring The main reason for the occurrence is: low temperature of aluminum liquid, poor fluidity; unreasonable filling parameters, low flow rate during filling; poor exhaust of the mold, high internal pressure, and impeding filling.
Four: shrinkage The reason for shrinkage: shrinkage is mainly around the hot section of the aluminum wheel, gathering or dispersing fine voids to make the tissue not dense.
Prevention method: pay attention to the mold temperature field, create sequential solidification conditions; increase the crystallization pressure.
Since it is modern technology, it is naturally more efficient than traditional gravity casting. Under the fine manual operation, the product quality will be better. A company, products are the first concept of development. In the primary basic productivity, continuous development, people remember that your products are better than your service. A hard house is more praise than a tofu project, and efforts under conscience production. What is revealed is the unity of the employees of this company, and what is the size of the obstacle? Many people comment on the strengths and weaknesses of a company based on the size of the company. In fact, they all know that this is not right, but it is the standard that he measures under unfamiliar visual observation. Many people think that the foundry industry is only a product of factory parcels. In fact, they are also a city's flesh, a crucial button. The products they produce cover a wide range of fields, from the beginning of metal hot processing to the formation of various handicrafts, they play an obscure role.
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