The green sand sand mold is made of clay and moderate amount of water as the main binder of the sand, and the sand mold is directly molded and cast in wet state. Green sand casting has a long history and is widely used. The strength of green sand depends on the clay slurry made by mixing clay and water in a certain proportion. Once the sand is mixed, it has a certain strength and can meet the requirements of molding and casting after being pounded into sand. Therefore, the amount of clay and water in the sand is a very important process factor.
Advantages of green sand casting：
1.1 The resources of clay are abundant and cheap.
1.2 After proper sand treatment, most of the used clay wet sand can be recycled.
1.3 Short cycle time and high work efficiency for manufacturing casting patterns.
1.4 The mixed sand can be used for a long time.
1.5 After pounding, the sand can still be deformed a little and not damaged, which is very advantageous to the mold pulling and the core.

Disadvantages of green sand casting：
2.1 When mixing sand to the sticky clay slurry coated on the surface of the sand, you need to use a high power sand mixing equipment with rubbing effect, otherwise it is impossible to get good quality sand.
2.2 Because the sand is mixed that has a fairly high strength, modeling sand is not easy to flow, it is difficult to pound, manual modeling both laborious and requires a certain skill, with machine modeling equipment is complex and large.
2.3 The rigidity of the mold is not high, the size accuracy of the casting is poor.
2.4 castings are easy to produce sand punching, sand trapping, porosity and other defects.

At the beginning of the foundry industry began to use tumbling wheel sand mixer to mix sand, so that the quality of green sand is greatly improved. New high-power GS high-efficiency rotor sand mixer can make sand mixing work to achieve high efficiency and high quality. The emergence of the shock compaction type molding machine, mainly shock solid, and significantly improve the tightness and uniformity of the castings. With the increase in casting size accuracy and surface quality requirements, and the emergence of high-pressure molding machine based on compaction. Using high-pressure molding machine manufacturing clay wet sand type, not only can make the castings size accuracy, surface quality improvement, and make the action of compacting the mold simplify, shorten the cycle, so that the whole process of modeling, modeling and automation to achieve high speed. Gas impact pressure of the new molding machine, the use of clay slurry thixotropy, can be applied by the instantaneous pressure of 0.5 MPa and get a very tight casting. These advances make the green sand casting can adapt to the modern industrial requirements of the important conditions. As a result, the green sand casting process has been used to produce a large number of high quality castings.

Because green sand has many advantages such as low cost, high efficiency and no pollution, it is still the main molding process for sand casting, and its production accounts for about 70% of the total number of castings. However, after casting green sand failure (dead) clay sintered at high temperatures and wrapped in the surface of the sand, forming a solid layer of "fish eggs petrified" ceramic layer. Direct use of waste (old) sand will greatly reduce the refractoriness of the sand, resulting in serious sand sticking on the surface of the casting, so the waste (old) sand must be treated by regeneration technology before reuse. Especially in recent years, resin core sand mixed into the wet sand, its mixed waste (old) sand using the general mechanical abrasive method for rephysiology, the quality of regenerated sand is difficult to reach the level of new sand, with the continuous improvement of sand processing equipment, mechanical regeneration is the main way of green sand old sand recovery.

Qingdao Sanzhuji Equipment Manufacturing Co., Ltd. specializes in the production of sand reclamation equipment,foundry machines,Sand casting equipment,GS high efficiency rotary mixer,no-bake resin sand mixer,Jolt squeeze molding machine/Jolt-squeezing moulding machines,Multi- Piston Moulding Machine/Hydraulic multi-piston moulding machine,foundry molding machine,flaskless moulding machine,shot blasting machine,dust collector,according to the amount of old sand recovered Carry out plan customization, and provide sand reclamation equipment installation, commissioning, and training. Welcome guests to visit the factory.