石蜡铸造工艺(Paraffin casting process)

石蜡铸造工艺（Paraffin casting process）

The lost wax casting process was developed from ancient casting process. More than 5000 years ago in the late Neolithic period, the ancient Chinese craftsmen in the manufacture of bronze, widely used lost wax casting process. At the time of the craftsmen according to the characteristics of plasticity and heat volatile beeswax, beeswax first carved wax to shape, and then wrapped in wax and clay and set aside a small hole, dry after roasting, the wax and clay gasification volatilization, has become a ceramic shell, the inner wall of the shell left female mold wax. At this time, the molten metal is injected into the shell along a small hole, and then the shell is broken after cooling to obtain the required metal blank. The basic principle is as modern lost wax casting technology, but more sophisticated. This is mainly reflected in the more stringent requirements of accurate wax type. Get the wax in modern technology not only directly carved on wax, but also through the metal mold (original version) silicone molding die is obtained, and then the wax wax injection after silica gel die. Casting material is no longer clay, instead of casting gypsum. Such products are much finer than those of ancient ones.

Lost wax casting process are: plastic mold - plastic mold pressing - wax injection (mold) - dressing wax (welding wax), ash (weighing) - filling - vacuum - tube gypsum gypsum plaster, gypsum, natural solidification baking and casting molten gold - fried plaster and flushing, pickling, cleaning (weighing) - Blank (shearing rolling light). Each process is described below.

I. pressing glue mould

The adhesive used for making rubber mould is rubber sheet with adhesive on both sides. General use of imported film, Castaldo card for more. One of the price is relatively low, because fewer ingredients contained in natural rubber, vulcanized hardness is slightly larger, but the die time is short, suitable for operation in experienced mold division; another slightly higher prices, with natural rubber more fully, soft texture, full of toughness, suitable for more complex, in the pattern shape small size and obvious concave silver version of die, not easy to break in when remove the wax wax.

The storage of raw films should be kept under the control of the storage temperature of 20 degrees Celsius. Generally, they can be stored for one year and stored at 0~5 degrees Celsius for 2~3 years.

In addition, the utility model also has a rubber mold which is made into a series of sizes and thicknesses in advance, and the inner wall is provided with convex and concave connecting feet, and the utility model is convenient to use.

The apparatus for pressing dies is a (vulcanizing) press molding machine, and its main components consist of two heating plates with internal live wire and temperature sensitive device, a thermostat, and a timer (some models do not have such a device). Die machine is also equipped with lifting screw, used for die and take out.

Matched with the press die frame, according to the number of holes, it can be divided into single plate, double plate, four