Tlpcasting is Sand Casting Manufacturer from China
Weight: 0.5kg – 1 ton
Capability: 1000 ton per month
Machining tolerance: +-0.01-0.03mm
Surface Roughness: 3.2 Ra um/125 Ra uinches
- less than 100g 1000 pcs
- 100g-200g 500 pcs
- More than 200g 200 pcs
is the most popular and simplest type of casting that has been used for centuries. The process is to pour liquid metal into a mold cavity. The molten metal is cooled to the room temperature and fully solidified. Then the sand mould can be broken open and separate the part from the sand mould. Therefore, Sand castings have a slow cooling rate. Sand castings generally have a rough fish.
Sand Casting Process
1.Making parting and assembling mold. Sand mould has two halves.
a.pack sand into the mould around the pattern
b.place a proper gate/runners in the mold.
c.apply sufficient pressure
d.remove the pattern
e.secure the two halves
Normally, The pattern is oversized due to metal shrinkage after cooling.
2.Pouring the molten metal in the mold cavity.
3.Cooling the mold to the room temperature.
When molten metal is cooled to room temperature and fully solidified, the mold cavity can be moved. Most of defects are caused at solidification stage.
4.Once the cooling period elapses the mould can be shaken out/broken off and casting
5.Cleaning, Trimming and Removing runner
Three advantages of sand molding
3.Take high temperatures.
More about Sand Casting
In sand casting, the mould is made of other metal materials. In this process, engineers make the mould size slightly larger than the finished product, and the difference is called shrinkage margin. The purpose is to melt the metal into the mould to ensure that the molten metal solidifies and contracts, thus preventing the cavity in the casting process. The core is only formed by placing the resin sand in the mould to form the casting on the internal surface. Therefore, the gap between the core and the mould becomes casting.
A set of mould is required in the smelting process. Forming usually involves the supporting frame of a mold, pulling out the mold to separate it during casting, melting the previously placed core in the mold and then closing the mould opening.
After cooling and solidification, we do cleaning. The purpose of cleaning is to remove excess metal from sand, grinding and casting. Welding and sand removal can improve the appearance of casting surface. The burnt sand and scale were removed to improve the surface appearance of the casting. Excess metal and other risers are removed. Further steps such as welding and grinding. Finally check its defect and comprehensive quality.
For sand casting, it can be used to produce any shape complex parts, especially the shape of the inner cavity complex parts. Also, this process is highly adaptable, with almost unrestricted alloy types and unlimited casting size. The source of materials is also relatively wide, waste can be remelted, equipment investment is low. For some materials with poor plasticity, such as cast iron, sand mold casting is the only forming process for making parts or blanks. However, it has the disadvantages of high scrap rate, low surface quality and poor working conditions. Sand casting process is widely used in automobile engine block, cylinder head, crankshaft and other castings.