Several problems to be paid attention to in the process of precision casting

　Precision castingSeveral issues to pay attention to in the process
Affected by the national policy, many of Dongguan's precision casting industry structures are now changing towards energy conservation and environmental protection. So what are the precautions for energy conservation in precision casting? The following summarizes a total of six points:
1. Select optimized planning and optimize the process yield rate of precision castings. Under the premise of ensuring the quality of precision castings, it is generally feasible to change the pouring system and use the heat insulation riser to import and export rates. Assuming that the export rate can be increased from 60% to 70%, energy consumption can be reduced by 14.3%.
2. Use high compactness molding machine and modern core-making technology to reduce the quality of castings and reduce the machining allowance as much as possible. Practice has proved that high-pressure molding can reduce the quality of castings by 3%-5% compared with manual molding and general machine molding, and the machining allowance can also be maintained at 2-3mm. Reducing weight not only saves energy in the precision casting workshop, but also reduces the energy consumption of subsequent processing.
3. Dongguan precision castings use energy-saving technological processes and arrange production reasonably. For example, use self-hardening resin sand or surface dry type instead of clay sand drying type to save the energy consumption of drying the mold; strict ingredients, recognition of the appropriate composition of precision castings, adopting useful incubation programs, and eliminating castings in the as-cast state The graphitization annealing process should be revoked for the white or hard spots; the promotion of as-cast ductile iron requires that the elongation after fracture is less than 12% should be obtained in the as-cast state; try to use the frequency wave harmonic oscillation aging process to remove stress reduction Thermal aging process.
4. Save data and try to reuse it. Because the production of any material requires energy.
5. Large-scale production of precision casting steel enterprises, that is, the output value of each casting unit is above 5000t. Due to the large output value of the enterprise, the working hours of the furnace are long, and the heating energy consumption of the furnace itself can be greatly reduced by spreading the energy consumption per ton of precision castings.
6. Progress management level, reduce the rejection rate. For example, for a precision casting plant with an annual output of 5,000 tons, every 1% drop in the scrap rate is equivalent to an extra 50 tons of precision castings. Based on the energy consumption per ton of 400 kgee, it can save 20 tons of standard coal a year, which means that every ton of precision castings decreases. Energy consumption of 4kgee.