There are three kinds of steel foundries in China. One is the sand casting foundries, then the water glass investment steel casting workshops, and the silica sol investment steel casting workshops. We usually called the investment casting as precision casting process.
Make sure your blade is in place correctly with the teeth pointing away from the saw throat and downward. Hold the blade up to the light to see the teeth or run your fingers along the edge to feel the position. Gently Please!
Sometimes a casting can have bubbles inside which may be missed by the manufacturer causing the item to break years later for no apparent reason. Of course, in a modern, well equipped workshop things like this are under tight control, but it can happen.
Though there are many who prefer to adopt the procedures used in Lost fusione a cera persa for the Foam casting. After spruing the foam original you are going to dip it into a solution to create a shell and then pour the metal. The goal of this is to create a cleaner surface.
Once the various pieces are completed they are carefully assembled to form the final wax model. Using the flame of a lamp the connecting points are heated do that they can be melted together. With the artist’s finger, the arm joint with smoothed to fit with the torso and the torso smoothed to fit with the base .Once completed the wax model are placed into water to ensure that they do not loose shape in the Indian sunny climate.
I have taught many jewelry students basic sawing techniques and dealt with many colorful excuses why they should not attempt to learn the new skill: ‘I don’t want to,” I might cut myself,’ ‘I’m too old,’ ‘I might inhale metal dust.’ I respect each and every excuse and realize metalwork is not for everyone. There may be lots of valid excuses, but there are just as many more reasons to learn the skill, refine the techniques, and show the world what you can do.
The wax casts are then dipped into a mixture of plaster and sand. This is repeated many times. Each dipping has to dry thoroughly before the next. With each successive dip, the sand and plaster mixture gets more coarse. This results in a very strong shell being built up over the wax cast. After these shells have hardened, vents and ‘runners’ are added to allow the molten bronze to enter the shell, and for gases and excess metal to escape. The shells are then placed into a kiln and baked at very high temperatures. This heat causes the wax inside of the shell to melt away, leaving an exact image of the sculpture in the shell. This gives the process its name of ‘lost wax casting’. After baking, the shell is now a mold ready for molten bronze.
So, really, why settle for gold or silver, when you can have a piece of art, sculpture, toy, candlestick, wine stopper, or figure crafted by bronze experts. When you own a cast bronze sculpture you know the expertise, craftsmanship and artistic talent that went into creating it. So go for the bronze!