Basic Key Points Of The Casting Process

The casting process is to make the pouring smoothly, get good casting technology, smooth and fast is the famous saying of Dr. Masantaro, that is, the pouring time should be as short as possible, and in the type cavity without disorder like pouring, the main points are as follows.
(1) About the upper and bottom of the casting: the cutting surface of the casting is in the lower box as far as possible, because the lower part has less shrinkage holes, and the material is dense.
(2) pouring method: there are top pouring from the upper part of the casting and bottom pouring from the lower part and middle part. Top injection casting is easy to produce sand and not much use.
(3) The position of the inner pouring gate: due to the rapid cooling of the molten iron in the inflow cavity into a solid, if the molten iron enters the thin wall in the thick wall part, in the large casting, if the inner pouring gate is small, the molten iron will be fast, and the sand should be washed near the inner pouring mouth. The number and shape of the inner pouring gate should be considered to determine its location.
(4) Types of inner pouring gates:
Mainly for the triangular inner gate and the trapezoidal inner gate. The triangular inner gate is easy to make, and the trapezoidal inner gate can prevent the casting.
(5) Break area ratio of direct gate, transverse gate and inner gate.