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What‘s the Process of Lost-wax Casting(or Investment Casting)?

Investment, or lost-wax, casting uses a disposable wax pattern for each cast part. The wax is injected directly into a mold, removed, then coated with refractory material and a binding agent, usually in five stages to build up a thick shell. Multiple patterns are assembled onto sprues. Once the shells have hardened the patterns are inverted and heated in ovens to remove the wax. Molten metal is then poured into the remaining shells where it hardens into the shape of the wax patterns. The refractory shell is broken away to reveal the completed casting. Next, let’s take a look at the specific processing process through figures.

Step 1: WAX INJECTION

Place the mold into the wax injection machine, form a wax mold and place it in clean water to cool;

Step 2: REPARING THE WAX PATTERN

After the wax model is formed, there will be burrs, flashes, etc., and the wax repairer will hold a scalpel to adjust and repair the wax model, so that the surface of the wax part is clean and flawless;

Step 3: ASSEMBLY SPRUES

Stick the repaired wax piece on the wax head, the size of the wax head will be determined according to the size and shape of the workpiece;

Step 4: SHELL MAKING

There are a total of 5 dipping times, and it takes 1 day to dry after each dipping. The more important thing is the first dipping, that is, the surface layer, which directly affects the surface finish of the workpiece and plays a decisive role in the surface quality of the workpiece;

Step 5: DEWAXING

That is lost wax. Melt the wax liquid in the tree after shell making by high temperature (wax liquid can be recycled);

Step 6: POURING

Make the tree reach a certain temperature through high temperature (the temperature is to be verified), pour molten steel into the tree, and wait for it to solidify;

Step 7: SHAKING

Vibrate the solidified tree with high intensity to remove most of the surface shell, which is the mortar in the fourth step;

Step 8: SHOT BLASTING

During the shell vibration process, only a large area of the shell is vibrated, but there are still some tiny shells inside the workpiece, and all the shells on the surface of the workpiece are cleaned by the shot blasting machine;

Step 9: CUTTING

At this time, cut the workpiece on the tree with a cutting machine;

Step 10: GRANDING

Grind the sprue of the workpiece;

Step 11: PICKLING

A dense oxide film, that is, a protective layer, is formed on the surface of the workpiece.

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