Qingyun Hongsheng Machinery Parts Co., Ltd. is one of the most reliable manufacturers and suppliers of precision casting parts of construction machinery in China. We warmly welcome you to wholesale high quality precision casting parts of construction machinery at low price from our factory. If you have any enquiry about quotation, please feel free to email us.
Precision casting parts of construction machinery
According to the typical process at home and abroad, the temperature of the surface layer and transition layer at the dry shell is (24 ± 2) ℃, and the blowing is prohibited when the humidity is 50%~70%. Back layer at the dry place, the temperature is
(24 ± 2) ℃, humidity 40%~60%, wind speed 6~8 m / s. In fact, the domestic precision casting plants can rarely strictly control the above parameters. In the relative humidity often exceeds 70%, while in winter
It is more generally lower than 60% or 50% (often from 35% to 45%). Most of the dry part of the surface layer shell without humidification device, by sprinkling water to improve the humidity. This is the winter low temperature, low humidity conditions below the layer type
The main cause of the easy shell cracking. In addition to the installation of dehumidifier control humidity in 60%~70%, should be installed with automatic control of negative ion humidifier or mechanical water mist machine
wetting. It is very difficult to strictly control the temperature in the large area drying room, but for the high precision castings with stable C T4~CT1, a small range of "special zone" can be created in the drying room to strictly control
Temperature and humidity. Complex parts such as deep holes and blind holes can also be dried under low humidity (humidity 30%, high wind speed 6 ~ 8 m/s) to shorten the drying of the component shell of the complex cavity
Speed, improve productivity and stable shell quality. Other parts can be appropriately relaxed to meet the temperature and humidity requirements, the temperature is (24 ± 5) ℃, the humidity is 50%~60%, and the wind speed is 2 ~ 4 m/s (back layer). Will make
The shell operating area coating, sand and the shell drying area, try to shorten the residence time of the wax module or shell in the operating area, can reduce the constant temperature and humidity requirements in the operating area. To reduce the dust to the air
For the damage of the regulating device, using the downward air blow of the central air conditioner is the most reasonable. Plants with a large production batch (monthly output of more than 80 t) can adopt a closed assembly line to strictly control the temperature
Degree, humidity and wind speed, conducive to stabilize the shell and casting quality.
Hot Tags: precision casting parts of construction machinery, China precision casting parts of construction machinery manufacturers, suppliers, factory
