Burr removal method and position accuracy of large-scale machining

Large-scale machining is divided into processing stages, and the surfaces with high processing quality requirements are divided into processing stages. Generally, it can be effectively divided into three stages of rough machining, semi-finishing and finishing. Mainly for processing quality; it is conducive to the rational use of equipment, easy to arrange the heat treatment process, and easy to find defects in the blank. Machining the datum surface first: During the processing of the part, the surface as the positioning datum should be processed first, so as to provide a precise datum for the subsequent processing as soon as possible. Called 'benchmark first.'

For parts such as box body, bracket and connecting rod for large-scale machining, the plane should be processed first and then the hole should be processed. In this way, the holes can be positioned on the plane, and the position accuracy of the plane and the holes, and the processing of the holes on the plane is convenient. The finishing processing of the main surface (such as grinding, honing, fine grinding/rolling processing, etc.) should be carried out in the process route stage. The surface finish after processing is above Ra0.8um. u200bu200bA slight collision will damage the surface. After processing, it must be protected with flannel. It is not allowed to directly touch the workpiece with your hands or other objects, so as to prevent the surface of the finishing process from being damaged due to the transfer and installation between the processes.

How to remove large-scale machining burrs?
1. The traditional method of manual deburring is steel file, sandpaper, grinding head grinding; and the trimming knife gradually replaced these traditional methods, it is simple and convenient to use, does not require technical treatment, saves costs and is environmentally friendly.

2. Chemical deburring uses the principle of electrochemical reaction to automatically and selectively complete the deburring operation for parts made of metal materials. It can be widely used in the deburring of pump bodies, valve bodies, connecting rods, plunger needle valve parts and other parts of different metal materials in pneumatic, hydraulic, engineering machinery, nozzle oil pumps, automobiles, engines and other industries. It is suitable for hard-to-remove internal burrs, heat-treated and finished parts.

3. Electrolytic deburring is suitable for removing burrs from cross holes in hidden parts or parts with complex shapes. The production efficiency is high, and the deburring time generally only takes a few seconds to tens of seconds. This method is often used for deburring gears, splines, connecting rods, valve bodies and crankshaft oil passages, as well as rounding sharp corners. The disadvantage is that the vicinity of the part burr is also subjected to electrolysis, the surface will lose its original luster, and even affect the dimensional accuracy.