How are wooden molds used for casting?

The process of mass production of jewelry using precision casting can be divided into eight processes:

①Original model: making the model from precious metal or wax and welding the sprue;

②Rubber mold: vulcanization and cutting of the rubber mold;

③Wax mold set: injecting the wax mold from the rubber mold and welding it into a wax tree;

④Finishing of the wax mold: cleaning the surface of the mold;

⑤Plaster type: the plaster paste of the wax mold is buried in vacuum defoaming and natural drying;

⑥Dewaxing and roasting: wax molding and roasting are carried out in a vacuum.

⑤Plaster type: the plaster paste of the wax mold is buried in vacuum defoaming and natural drying;

⑥Dewaxing and roasting: wax recovery and plaster mold roasting process;

⑦Melting metal: melting the alloy to be used;

⑧Casting: pouring the shape. There is a definite connection between each process. In order to obtain good jewelry castings, each process should be in strict accordance with the operating procedures, a process of negligence, will lead to jewelry casting products are not qualified.

Expanded Information

One of the tasks of the humanized design of the mold is to make the user feel convenient and comfortable. This is the most central element of the humanized design of models (cores) and molds. Since the gravity casting model of the intake manifold is quite complex, in addition to the need for sand cores at the air tubes, sand cores must also be placed at the bends.

The initial process is to make a large sand core for the sand core of the elbow, the core must be made of the sand core of the elbow and the core of the main body of the air tube, the two sand cores together weigh 25kg, and the temperature of the metal type is as high as 350℃ or more, so it is extremely difficult to make the core. Moreover, the live block at the bend must be removed along with the core during the core making process, and then the live block is slowly removed and put back into the core box.

This process is also a big problem: First, the core box live block and sand core more than 20kg, the second is the core box mold and sand core temperature are above 220 ℃, the third is the operation process to prevent touching the sand core. Resulting in greater labor intensity of the operator.

Baidu Encyclopedia - Casting Model

Baidu Encyclopedia - Wooden Mold