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What Is Precision Machining?
Oct 23, 2017

Precision processing refers to the processing accuracy of 1 ~ 01μm, the surface of the super-roughness and Ra01 ~ 001μm processing technology. But this precision boundary will be with the progress of processing technology and constantly changing, and today's precision machining may be tomorrow's general processing.

Precision machining to solve the problem, one processing accuracy, including shape and position tolerance, dimensional accuracy and surface conditions; Second, processing efficiency, some processing can achieve better processing accuracy, but difficult to achieve high processing efficiency. Precision machining, including micro-processing and ultra-fine processing, finishing and other processing technology. The traditional precision machining methods are abrasive belt grinding, precision cutting, honing, precision grinding and polishing.

(1) belt grinding is a sticky abrasive blended fabric for the workpiece for processing, belonging to the scope of grinding with abrasive grinding, high productivity, good surface quality, the use of a wide range of features.

(2) precision cutting, also known as diamond cutting tool (SPDT), with high-precision machine tools and single crystal diamond cutting tools for processing, mainly for copper, aluminum and other non-grinding processing of soft metal precision machining, such as computer Of the drum, disk and high-power laser with a metal mirror, etc., than the general cutting precision to 1 to 2 levels.

(3) honing, with the oil stone sanding composition of the honing head, under a certain pressure along the surface of the workpiece reciprocating motion, after processing the surface roughness up to Ra0.4 ~ 0.1μm, preferably to Ra0.025μm, mainly used Processing cast iron and steel, should not be used to process the hardness of small, good toughness of non-ferrous metals.

(4) precision grinding and polishing through the between the workpiece and the tool between the abrasive and processing fluid, workpiece and research tools for mechanical friction between the workpiece to achieve the required size and accuracy of the processing methods. Precision grinding and polishing for metal and non-metallic parts can achieve other processing methods can not achieve the accuracy and surface roughness, precision machining the surface roughness Ra ≤ 0.025μm processing metamorphic layer is very small, high surface quality, precision grinding equipment Simple, mainly for the plane, cylindrical surface, gear tooth surface and the sealing requirements of the processing of spurs, can also be used for gauges, measuring blocks, fuel injectors, valve body and spool of the finishing process.

(5) polishing is the use of mechanical, chemical, electrochemical method of the workpiece surface of a micro-processing, mainly used to reduce the workpiece surface roughness, commonly used methods are: manual or mechanical polishing, ultrasonic polishing, chemical polishing, electricity Chemical polishing and electrochemical mechanical compound processing. Manual or mechanical polishing after the workpiece surface roughness Ra ≤ 0.05μm, can be used for flat, precision machining cylindrical, curved and mold cavity polishing processing. Ultrasonic polishing processing accuracy of 0.01 ~ 0.02μm, surface roughness Ra0.1μm. The surface roughness of chemical polishing is generally Ra ≤ 0.2 μm. Electrochemical polishing can be raised to Ra0.1 ~ 0.08μm.