What is Precision Casting?
As a general term, precision casting refers to the process of obtaining precision-sized castings. The castings obtained by precision casting are more precise and have a better surface finish than castings obtained by traditional sand casting. It is an advanced process of near-net shape. It is suitable for orders with a low quantity request. Its products are precise, complex, and close to the final shape of the part. They can be used directly without processing or processing.
There are several types of investment casting , including ceramic casting, metal casting, pressure casting, and lost foam casting.
The most common type of precision casting service is investment casting, or lost wax casting. It is used for producing ferrous and nonferrous metals.
A suitable investment material, such as paraffin, is used to make the investment mold. The refractory coating and refractory sand processes are repeated on the investment mold. Upon hardening and drying, the internal melting mold is removed to create a cavity. After baking the shell, sufficient strength is achieved. It is then burned off to remove residual investment material and poured with metal material. The sand is cleaned, cooled, shelled, and solidified. Therefore, a high-precision finished product can be achieved through heat treatment and cold working, as well as surface treatment.
Precision castings have a lot of choice in both design and material. They can be made from any steel or alloy steel. Precision castings are therefore the highest quality castings available.
Each casting producing requires a mold and a wax pattern, which takes time and separate costs. So it is not cost-effective for low-volume products.
Processes involved in precision casting
Step 1. Design of the mold
Our engineer will design the mold based on the drawing. We will purchase the mold from a mold factory.
Step 2. In jection with wax
A machine injects wax into desired castings. The wax design is produced by injection molding. This process is called patterns.
Step 3 . Tree of assembly
A casting cluster or assembly tree is formed by attaching the patterns to a central wax stick, called a sprue.
Step 4. Making a shell
Up to SIX layers may be applied in this manner by immersing the assembly in a liquid ceramic slurry and then in an extremely fine bed of sand. The shell is dry in each layer.
Step 5. Dewax
When the ceramic is dry, heat it. The wax will melt and flow out of the shell.
Step 6. Casting
By gravity pouring, molten metal is poured into the shell. As the metal cools, the gates, sprue, and pouring cup solidify.
Step 7. Knochout
The ceramic shell is broken off by vibration or a knock-out machine after the metal has cooled and solidified.
Step 8. Cut off
High-speed friction saws are used to cut the parts away from the central spruce.
Step 9. Grinding
The casting pouring part will be ground carefully after the casting has been cut off.
Step 10.Inspection and Post Treatmen
As per the drawing and quality request, the casting will be inspected by the inspector. If there are unqualified parts, they will be repaired and inspected again.
Step 11. Finished castings
As soon as surface finishing operations are completed, the metal castings become identical to their original wax patterns and can be shipped to the customer.
HULK is committed to supplying global metal products customers with higher quality products and services.
HULK Metal has made great efforts to build a business since 21st century. As one of the largest Metal Fabrication Services Providers in China, HULK Metal has been integrating R&D, production, and service based on Chinese hardware production for tens of years.