Precision casting refers to the general term for obtaining precision-sized castings. Compared with the traditional sand casting process, the casting size obtained by precision casting is more accurate and the surface finish is better. It includes: investment casting, ceramic mold casting, metal mold casting, pressure casting, and lost foam casting.

Precision casting is also called lost wax casting. Its products are precise, complex, and close to the final shape of the part. It can be used directly without processing or with little processing. It is an advanced technology with near net shape.

Basic Concept

It includes: investment casting, ceramic mold casting, metal mold casting, pressure casting, and lost foam casting.

One of the more commonly used is investment casting, also known as lost wax casting: select suitable investment materials (such as paraffin) to make investment molds; repeat the steps of dipping refractory paint and sprinkling refractory sand on the investment mold, hardening the shell and drying; Melt the inner investment mold to obtain a cavity; bake the mold shell to obtain sufficient strength and burn off the remaining investment material; cast the required metal materials; solidify and cool, and remove the sand after removing the shell to obtain high Precision finished product. According to product needs or heat treatment, cold processing and surface treatment.

Process Flow

Pressing wax (wax injection moulding) --- wax repair - wax inspection - group tree (wax module tree) --- shell making (first dip, sand, then paste, and finally mold

Shell air-drying) --- dewaxing (steam dewaxing) --- mould shell roasting ---chemical analysis - pouring (pouring molten steel in the mould shell) --- vibration shelling ---

Cutting and separation of casting and pouring rod----Grinding gate---Initial inspection (burr inspection)---Shot blasting---Machining---Polishing---Finished product inspection--- Warehousing

The casting production process is roughly like this. Generally speaking, it can be divided into wax pressing, shell making, pouring, post-processing, and inspection.

Pressing wax includes (pressing wax, repairing wax, group tree)

Wax pressing --- Use wax pressing machine to make wax molds

Repair wax---correct the wax mold

Group tree---group Lamo into tree

Shell making includes (hanging sand, hanging slurry, air drying)

Pouring includes (baking, chemical analysis, also called spectroscopy, pouring, shell shock, gate cutting, and gate grinding)

Post-treatment includes (sand blasting, shot blasting, correction, pickling)

Inspection includes (wax inspection, initial inspection, intermediate inspection, finished product inspection)