Views: 22 Author: Site Editor Publish Time: 2021-10-12 Origin: Site
Finishing services refer to various machining processes whose machining accuracy and surface finish are higher than those of the corresponding machining methods.
The precision machining process includes precision machining (such as diamond boring, precision turning, wide-edge precision planing, etc.) and high-brightness and high-precision grinding. The precision of precision machining is generally 10~0.1μm, the tolerance level is above IT5, and the surface roughness Ra is below 0.1μm.
Relying on high-precision, high-rigidity machine tools and finely sharpened tools to cut a very thin layer of metal on the surface of the workpiece with high or very low cutting speed, small depth of cut and feed rate. Obviously, this process Can significantly improve the machining accuracy of parts.
Due to the small residual area in the cutting process, and the maximum elimination of the adverse effects of cutting force, cutting heat and vibration, it can effectively remove the surface deterioration layer left by the previous process, and the surface after processing is basically free of residual pull The stress and roughness are also greatly reduced, which greatly improves the quality of the processed surface.
1. Finishing is an abrasive precision machining method that uses fine abrasive oilstone mounted on the vibrating head to micro-cut the workpiece.
2. Finishing is mainly to reduce the Ra value, which can reach 0.2～0.012μm, which can appropriately improve the shape accuracy.
3. The finishing productivity is very high, and it is often used to process the outer circle, inner circle, plane, groove surface and spherical surface of crankshafts, rollers, bearing rings and some precision parts.
High-brightness and high-precision grinding also requires the machine tool to have high precision and rigidity. The grinding process uses a finely trimmed grinding wheel to produce multiple micro-cutting edges of equal height on each abrasive grain for very small grinding. Depth, under proper grinding pressure.
Very fine chips are cut from the surface of the workpiece plus the sliding, squeezing and smoothing effects of the micro-cutting edge when it is in the state of micro-ton, and the friction and polishing effects of multiple no-feed smoothing stages.
Thereby, a high-gloss and clean surface with high processing accuracy and good physical and mechanical properties can be obtained. In summary, the use of precision machining technology can comprehensively improve the machining accuracy and surface quality of the workpiece.
China Finishing service is processing with high-precision processing machinery. There are two main ways to realize the precision machining of parts: one is to use high-precision processing machine tools to process high-precision parts; the other is to use error compensation technology to improve the machining accuracy of parts. But this limit is constantly changing with the progress of processing technology, today's precision machining may be tomorrow's general machining.
According to the mechanism and characteristics of the processing method, finishing can be divided into three categories: removal processing, combined processing and deformation processing.
1. Removal processing
Removal processing, also known as separation processing, is the removal of part of the material from the workpiece. Traditional machining methods, such as turning, milling, grinding, grinding and polishing, as well as electrical discharge machining and electrochemical machining in special machining, are all This processing method.
2. Combined processing
Use physical and chemical methods to combine different materials. According to the combination mechanism, method, strength, etc., it is divided into three types: deposition, injection and joined.
3. Deformation processing
Deformation processing, also known as flow processing, is the use of force, heat, molecular motion and other means to deform the workpiece and change its size, shape and performance.