What should be paid attention to in the process of casting
Under the influence of national policies, many foundry industrial structures are changing to energy saving and environmental protection. What are the precautions for energy saving production in foundry?
The high compactness molding machine and modern core making technology are used to reduce the casting quality and machining allowance as much as possible. It has been proved that the quality of the castings can be reduced by 3% - 5% and the machining allowance can be kept at 2-3mm. Reducing the weight can not only save energy in the foundry, but also reduce the energy consumption in the subsequent processing. Adopt energy-saving technological process and reasonably organize production. For example: use self hardening resin sand or surface dry mold instead of clay sand dry mold to save energy for drying mold; strictly mix ingredients, determine the appropriate composition of the casting, take effective inoculation plan, eliminate the white mouth or hard spot on the casting in the as cast state to cancel the graphite annealing process; promote the as cast ductile iron, and require the elongation below 12% after fracture to be obtained in the as cast state; try to use as much as possible Frequency wave vibration aging process, remove stress relief thermal aging process. Improve management level and reduce scrap rate. For example, for a foundry that produces 5000 tons of castings, every 1% reduction in the scrap rate is equal to 50 tons of more castings. The energy consumption per ton is calculated as 400kgee, which can save 20 tons of coal per year, that is to say, the energy consumption per ton of castings is reduced by 4kgee.