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30
2024
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04
"Machining" surface treatment
Author:
Mechanical processing surface treatment:
1. Chemical polishing: A process method in which the surface of the workpiece undergoes chemical or electrochemical changes under the action of abrasives, chemical solvents, etc., to achieve the desired effect;
2. Anodizing: A method of applying an oxide film containing metal cations to the surface of the workpiece, which oxidizes into a colored metal layer under appropriate conditions. The metal anodizing process includes electrolytic oxidation, chemical oxidation, and plasma oxidation;
3. Sandblasting: A process method that uses mechanical means to create a fine sand-like roughness on the surface of the workpiece to enhance its surface friction characteristics;
4. Electroplating: A process method that uses chemical or electrolytic methods to coat a layer of metal film on the surface of metals or alloys. Electroplating is a widely used surface treatment technology in hardware processing.
The manufacturing precision of fine mechanical processing is high, and the surface of the product is smooth during use, meaning that the finely processed mechanical parts can save a lot of machining work and can be directly used in life. The surface of fine mechanical processing will have many gray-black circular shallow pits, which are filled with slag material before the equipment is cleaned. These materials will directly affect the quality of our castings.
Fine mechanical processing 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 some parts with complex stress, strength, toughness, and good requirements. Ductile iron has developed to be the second most widely used cast iron material after gray cast iron. The so-called "using iron instead of steel" mainly refers to ductile iron.
The matrix of fine mechanical processing is divided into three types: ferrite, pearlite, and the characteristic of gray cast iron is the presence of flake graphite. Ferrite + pearlite. C and Si are elements that facilitate graphitization. In order for cast iron to be gray cast, the composition of cast iron should be controlled within 2.5~4.0%C and 1~2.5%Si to avoid excessive and coarse graphite flakes. Elements such as Al, Cu, Ni, and Co in cast iron can also promote graphitization. Elements that form carbides such as n, Cr, W, Mo, and V can reduce the mechanical properties and fluidity of cast iron.
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