Burr removal method and position accuracy for large mechanical processing, Nanjing Precision Engineering Co., ltd

by:NJPE     2020-02-17
The large-scale mechanical processing is divided into processing stages, and the surfaces with high processing quality requirements are all divided into processing stages, which can generally be effectively divided into three stages: rough processing, semi-finished processing and finish processing. Mainly to ensure the quality of processing; It is conducive to the rational use of equipment, easy to arrange heat treatment procedures, and easy to find blank defects. First processing datum: during the processing of parts, the surface as the positioning datum should be processed first, so as to provide fine datum for the processing of subsequent processes as soon as possible. It is called 'benchmark first '. For large-scale mechanical processing, the box body, bracket, connecting rod and other parts should be processed first. In this way, the hole can be positioned in a plane to ensure the position accuracy of the plane and the hole, and it is convenient for the processing of the hole on the plane. Finishing of the main surface (Such as grinding, honing, fine grinding, rolling processing, etc) , Should be placed in the final stage of the process route, the surface finish after processing is Ra0. Above 8um, a slight collision will damage the surface. After finishing, it should be protected with flannel. It is absolutely not allowed to directly contact the workpiece with hands or other objects to avoid finishing the surface, damage due to transshipment and installation between processes. Burr removal method for large mechanical processing? 1. The traditional way of manual deburring is steel file, sandpaper and grinding head; The trimming knife gradually replaces these traditional methods, which is simple and convenient to use, does not require technical treatment, saves costs and is environmentally friendly. 2. Chemical deburring is to use the principle of electrochemical reaction to automatically and selectively complete deburring operations for parts made of metal materials. It can be widely used for deburring parts such as pump bodies, valve bodies, connecting rods, plunger needle valve pairs and other parts of different metal materials in pneumatic, hydraulic, engineering machinery, nozzle oil pumps, automobiles, engines and other industries. It is suitable for internal burrs that are difficult to remove, parts after heat treatment and finishing. 3. Electrolytic deburring is suitable for removing burrs of cross holes in hidden parts or parts with complex shapes, with high production efficiency, and deburring time generally takes only a few seconds to tens of seconds. This method is commonly used for deburring gears, splines, connecting rods, valve bodies, crankshaft oil circuit orifice, etc. , as well as sharp corner rounding, etc. The disadvantage is that the vicinity of the burr of the part is also subjected to electrolysis, and the surface will lose its original luster and even affect the dimensional accuracy.
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