There are two kinds of platinum crucible processing in China: 1. Die stamping forming; 2. Spin forming. Die stamping and forming. Advantages: Small processing difficulty, high processing efficiency; Disadvantages: the bottom of the die stamping make platinum sheet stretch forming, because is a local point of force, so as a result, the wall thickness of the stressed part will be thinner than that of other parts, and the overall crucible will be uneven in thickness, which will ultimately affect the service life of platinum crucible.2. Spin forming. The spinning forming process refers to the machining process that makes the stress point of sheet metal from point to line to surface by mechanical rotation, and at the same time gives certain pressure to make metal material deformation and flow along this direction.
The spinning process overcomes the disadvantage of only local point force in die stamping, and makes the whole metal surface uniformly stressed, so the wall thickness of finished products is uniform, the processing precision is high, and the service life is greatly improved compared with the traditional die stamping process. In the domestic platinum crucible and platinum yellow crucible and other platinum products processing field, the majority of factories processing crucible cup bottom adopt the traditional grinding tool stamping process, and the outer edge of crucible adopts the welding process, so the product quality cannot be greatly improved. Platinum crucible and platinum yellow crucible and other platinum products are processed by plate spinning process. The plate is formed in one time without welding on the outer edge, so the product quality is greatly improved compared with the traditional process.
Characteristics of finished products by spinning process: 1. Smooth and clean surface; 2. Uniform wall thickness; 3. sheet metal forming, no joints, no welding spot; 4. High precision. Effect of finished products made by spinning process: In the field of crystal growth, the crucible has no joints because the surface of the crucible is smooth, the wall thickness is uniform and the temperature field is easy to control, thus providing necessary conditions for the growth of high-end crystals.
