Sand casting production of large steel casting attention

Sodium silicate sand casting has been used for centuries to produce large steel castings, and many steel casters are still in use today, because of low cost, short cycle time and wide adaptability. The main steps include mold, core making, molding, melting and pouring, cleaning and so on. But today we need to pay attention to the process and other matters from the sand casting of large steel castings.

In the casting production, it is necessary to leave enough machining allowance to facilitate the casting production and not damage the casting when machining. The specific amount of reservation needs to be decided with drawings and materials.

 

In the modeling need to design a good die slope, convenient mold from the cast out; It is also necessary to design good casting fillet, which is also to prevent large steel castings in the wall connection and corner stress, crack, casting Angle damage and trachomes; In order to ensure that the core is fixed and exhaust in the casting, it is necessary to design a good core head; It is also necessary to consider the shrinkage of the casting after pouring, so this shrinkage size needs to be added in the mold.

 

Used for conveniently, the price is cheap, sand can be recycled after treatment, but also need to know the sand mold casting pouring time, only to get after casting mould has been damaged, need to staff to shape, so the production efficiency of sand mold casting is low, and the sand mold casting if improper operation easy to produce sand inclusion, porosity defects such as large steel appear quality problem, So manufacturers must be in strict accordance with the process operation.