Technology of Several Lamp Accessories Ⅱ
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Author : Rise Lighting Amy
Update time : 2023-07-15 18:10:42
Casting process
For castings that require machining, mechanical machining allowance should be provided when manufacturing the mold. Mechanical machining allowance is abbreviated as machining allowance. The machining allowance should be reasonably choosen. Excessive machining allowance not only wastes metal and increases mechanical processing workload, but also sometimes leads to thicker section and larger hot spot, resulting in coarse grain size of castings and even causing shrinkage or porosity. If the machining allowance is too small, the machined surface of the casting cannot be completely cut, resulting in the parts not meeting the required accuracy and smoothness. The size of machining allowance is related to the type of casting metal, production conditions, casting size, and surface processing department.
Plastic molding process
The plastic forming process is a key link in plastic processing. Produce various forms of plastic (powder, granules, solution, or dispersion) into products or blanks of the desired shape. There are over thirty methods of forming, and the choice mainly depends on the type of plastic (thermoplastic or thermosetting), the initial form, and the shape and size of the product. The common processing methods of thermoplastics include extrusion, injection, calendering, blow molding and Thermoforming. The processing of thermosetting plastics generally involves molding, transfer molding, and injection molding. Lamination, molding and Thermoforming are used to form plastics on a flat surface. The above plastic processing methods can be used for rubber processing. In addition, there are also casting processes using liquid monomers or polymers as raw materials. Among these methods, extrusion and injection molding are the most commonly used and also the most basic molding methods.
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