stainless steel,gray iron ,ductile iron casting valve bodies

about Lost Wax Casting process

The history of investment casting is long that mostly common used in 1940s, when the aircraft industry was getting started and all complicated shapes of alloy steel products were difficult to be machined so that it was made by investment casting, and to continue using to nowadays.

All kinds of stainless steel, carbon steel or alloy steel can be used for investment casting in order to reduce the machining and complete all dimensions and complicated shapes.

The investment casting process from moulding design, investment casting or lost wax metal casting to machining as a complete production line in order to serve the wide range of customers. A complete production from wax injection, assembly, deeping, stuccoing and quick drying system, dewaxing, sintering, pouring, sand blasting, heat treatment, machining, QC, and etc.

Pattern Die Making

Pattern die would be made only after drawings approved by customers, and testing the die till customers’ requests are met; starting mass production with wax injectors.

Pattern Material Injection

Preparing tubs of wax in injectors and removing burr of wax productions.

Pattern Assembly

Fasten wax patterns with chromium by the gate to runners which are attached to a pouring cup. Hence, patterns, runners & pouring cup comprise the cluster or tree; then cleaning the oil on surfaces by oil removal agent.

Dipping & Coating

Dipping the entire cluster into a ceramic slurry then coating it with fine ceramic sand, sorted from thick; middle and thin. Ceramic slurry & sand should be 5~6 coats and each coat must be dried for at least 4 hours. After that, placing dried coated clusters in air-conditioned room and keeping humidity range between 45%~75% in temperature between 23°C~25°C.

Dewaxing

Removing wax from dried coated clusters in furnace in order to get the ceramic shell molds.

Sintering

Putting shell molds into sintering furnace in a high temperature of approximately 1100°C. This step is to firm/force shell molds to be hard/strong enough in preparation for casting.

Casting

Pouring molten metal in approximately 1500°C~1750°C into shell molds, then cooling them by time basis.

Spectrochemistry Analysis

Inspection on materials by spectrometer testing.

Deshelling

Removing shells from castings when the surfaces are not going to red anymore.

Cutting

Cutting castings from clusters and belt grinding the remaining protrusions left by gates or runners.

Heat-Treatment

Heat treatment would be made under customers’ requests.

Sand Blasting

Sand blasting on ground surface of castings (for better result) and acid washing, which for preventing from oxidation. After that, unprocessed castings are finished.

Inspection

Dimension measurement, Spectrometer Analysis, Metallographic & Hardness report, Magnetic Particle Test, X-Ray Test, and Ultrasonic Instrument.

Shipping

Efficiency of package goods delivery on time per your shipping requests