Surface treatment of "machining"
Machined Surface Treatment:
1. Chemical polishing: A process method that achieves the purpose by chemical or electrochemical changes on the surface of the workpiece under the action of abrasives and chemical solvents;
2. Anodizing: A method of coating an oxide film containing metal cations on the surface of a workpiece and oxidizing it into a colored metal layer under appropriate conditions. Metal anodizing processes include electrolytic oxidation, chemical oxidation, and plasma oxidation;
3. Sandblasting: A process method that uses mechanical methods to create a fine sand-like roughness on the surface of the workpiece to enhance its surface friction characteristics;
4. Electroplating: A process method of plating a layer of metal film on the surface of metal or alloy by chemical or electrolytic methods. Electroplating is a widely used and large-scale surface treatment technology in hardware processing.
The manufacturing precision of fine machining is high, and the surface of the product is smooth during use, which means that the fine machining produced can save a lot of machining work and can be directly used in life. There will be many gray-black circular shallow pits on the surface of fine machining. Before the equipment is cleaned, the pits are filled with slag. These substances will directly affect the quality of our castings to a certain extent.
Fine machining uses a cast iron material whose comprehensive performance is close to that of steel. Based on its good performance, it has been successfully used to cast parts with complex stress, high strength, toughness, and good requirements. Ductile iron has developed into a widely used cast iron material second only to gray cast iron. The so-called "using iron instead of steel" mainly refers to ductile iron.
Fine machining matrix-related departments are divided into three types: ferrite, pearlite, and gray cast iron. The characteristics of gray cast iron are flaky graphite. Ferrite + pearlite. C and Si are elements that graphitize well. In order for cast iron to be gray cast iron during casting and not too much, the composition of cast iron should be controlled to 2.5~4.0%C and 1~2.5%Si. Too much and coarse graphite flakes. Elements such as Al, Cu, Ni, and Co in cast iron will also graphitize. nCrWMoV and other carbide-forming elements can also reduce the mechanical properties and fluidity of cast iron.
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