Manufacturing Process of Handle
< Manufacturing Process of Handle >
The “lost wax” casting process is widely used in Japan and Korea to manufacture scissor handles.
An aluminum mold made by an expert is needed to start lost-wax casting.
Materials that dissolve and solidify rapidly in lost-wax castings, such as paraffin wax, are used.
Process of dissolving the solid material into a liquid.
Liquefied wax is put into molds through a machine.
Wax solidifies in seconds, and the wax model is removed by opening the mold.
Put the finished wax model onto larger base wax pieces.
Put as many wax models as needed on the base.
Put fine plaster powder onto the wax model.
When the first round of plaster powder dries up, put a thicker version of plaster powder onto the wax model.
When the second cover dries, put bigger and tougher plaster powder on.
Machine used to put plaster powder on wax models.
Do multiple rounds of plaster powdering and dry the mold for a few days.
When the plaster powder dries up and becomes a plaster mold, heat up the mold and get the wax model out by dissolving them.
Use a small blast furnace to dissolve the materials that will be poured into the plaster mold.
Add C, Si, Mn, P, Cr, Nl, or other substances to Fe to make the desired handle.
When all the materials needed are combined, make them molten metal at a high temperature.
Pour the liquefied molten metal into the plaster mold.
High skills are needed to pour the metal into the mold without breaking the mold.
Let the metal in the mold solidify slowly.
The actual handle will be ready inside the plaster mold.
Handles will have to be cut by hand one by one from the metal bar.
It usually takes about 20 to 40 days to make a handle.
Equipment and skill levels are all varied depending on the factory.