The foaming mould design

The foaming mould design

The mould material: in the mould production process, the foaming mould should work under these conditions of periodical heating,cooling,water and steam. So the material performance should meet the following requirement:

a.  The heat conduction performance is good, which is beneficial to heat and cool quickly.

b. It has good corrosion resistance performance to steam and water medium.

c. It has enough strength to bear the pressure and heating steam pressure produced by beads foaming in the mould cavity and to keep mould shape stability and size stability.

Because the aluminum alloy weight is light and heat conducting performance is good, we generally adopt the aluminum alloy to make foaming mould. By aluminum alloy mould, it can not only heat and cool uniformly in the foaming molding process, but also the aluminum alloy’s machining performance is good and it can get the model shape and size accuracy requirement.

The moulding surface and material feeding entrance position

The lost foam mould is different from the other casting mould. It must get the closely true foam plastic model with the casting shape. All mould designs are restrict.

The parting surface choice should make the mould easy to install, take apart and operate except for the necessary guarantee of rigidity and strength. It is in favor of setting the material feeding entrance, which is convenient for beads to fill the cavity fully and convenient for model to take out from the mould.  

In the general situation, we try our best to adopt the integral mould. For the complex shape of casting(such as cylinder block or valve), we can we can divide the mould into the several parts or adopt core pulling combination mould structure.

The material entrance design is reasonable