An overview of lost wax casting process
Service Detail from HeBei Matson Metal Tech Co., Ltd.
Step 1: Wax mold-Precision investment casting starts with a wax model of casting wax to create by using high-temperature wax. With the use of a casting mold a wax model can be sprayed with a very accurate dimension and an excellent contour sharpness.
Step 2: Assembly-The patterns are attached to a central wax stick, called a sprue, to form a casting cluster or assembly tree.
Step 3: Shell making-After the wax models are glued together, the tree is given a fireproof ceramic shell. This shell is constructed by repeatedly submerging the tree (up to 7 or 9 times) in a slurry and sprinkle it with ceramic sand. The ceramic layers are then hardened in a drying chamber, exposed to air.
Step 4: Dewaxing-After the layers have been formed and dried, the wax is melted out of the ceramic tree by using steam (120°C) in an autoclave. This is why it is called ‘lost wax casting’. The molten wax can be regenerated and is reusable. The ceramic tree is then baked at a high temperature (1100°C) and reaches its final strength through the sintering process. Wax leftovers are burned up during this process.
Step 5: Pouring-In the conventional process, the shell is filled with molten metal by gravity pouring. As the metal cools, the parts and gates, sprue, and pouring cup become solid casting.
Step 6: Cutting-When the metal has cooled and solidified, the ceramic shell will be broken off by vibration or knock-out machine.
Step 7: Machining- Grinding until the parts meet the specifications of the original part, some parts may require additional heat treatment, Depending on tolerance requirements, some secondary machining might be required for proper function.
Step 8: Final testing Measure the parts by advanced tools to make sure it on exact specifications.
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