Description: green sand mold casting
Material: GGG40, ASTM80-55-06, ENGJL-400-15
Weight: 1-30KG
Process: Resin sand casting process + surface spraying
Application: Farm machinery keys, wrenches, wedge ends, hooks
Instruction: Sand Casting Iron Cast product uses resin sand casting process, the surface is sprayed with black paint, both beautiful and rust prevention, such products for agricultural machinery parts, but not for too strong conditions. Such as keys, wrenches, wedge ends, hooks, etc.
The core of green sand mold casting is very important.
In order to ensure the quality of the casting, the core used in sand casting is usually dry core. According to the different binder used in the core, the core can be divided into clay sand core, oil sand core and resin sand core.
Clay core
A simple core made of clay sand.
Oil sand core
The core made of core sand with dry oil or semi-dry oil as binder is widely used. The viscosity of oil is low, the mixed core sand has good fluidity, and it is easy to compact when making core. But just made of core strength is very low, generally with imitation core plate to undertake, and then in 200 ~ 300℃ oven baking for a few hours, the air will oxidize the oil and harden it. The disadvantages of this core making method are: the core is easy to deform in the process of demoulding, handling and baking, resulting in the reduction of dimensional accuracy of the casting; Baking time is long and energy consumption is high.
Resin core
A variety of cores made from resin sand. The core is hardened in the core box before it is removed to ensure the core shape and size tolerance. According to the different hardening methods, resin core is generally divided into hot box core, shell core and cold box core making three methods. ① Hot box system core: appeared in the late 50's. Usually, furan resin is used as the core binder, in which a latent hardener (e.g., ammonium chloride) is added. During core making, the core box is kept at 200 ~ 300℃. After the core sand is shot into the core box, ammonium chloride reacts with free formaldehyde in the resin to form acid at a higher temperature, so that the core is soon hardened. It takes about 10 ~ 100 seconds to establish the demoulding strength. With the hot box method core, the size accuracy of the core is relatively high, but the process equipment is complex and expensive, energy consumption is much, the emission of irritating gas, the working conditions of the workers are also very poor. The shell core is made of hot coating sand, which has high strength and good quality. ③ Cold box system core: appeared in the late 60's. Urane resin was used as binder for core sand. With this process, the core box is not heated, and amine steam is blown into it for a few seconds to harden the core. This method is superior to the hot-core box method in energy, environment and production efficiency. In the mid-1970s, the cold core box method of furan resin hardening by blowing sulfur dioxide appeared. The hardening mechanism is completely different from the urane cold core box method, but the technological characteristics, such as fast hardening and high core strength, are roughly the same as the urane cold core box method.
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