The division of large precision machining
processing stage, the high quality demand of machining surface, are divided into processing stage, generally can be divided into rough precision machining, effective semi-finishing and finishing three stages.
Mainly in order to ensure the quality of processing;
Is conducive to the rational use of equipment to facilitate arrangements for heat treatment process, and facilitate the blank defects, etc.
Datum processing: first part in the process of machining, surface should be machined out first as positioning reference, as soon as possible in order to provide fine benchmark for the machining of the subsequent handling.
Known as the 'benchmark'.
Large for housing, support and connecting rod machining parts should be flat after machining holes.
So you can by plane positioning hole processing, ensure the accuracy of the plane and hole location, and the porosity of the plane processing bring convenience.
The main surface finishing processing (
Such as grinding, honing, fine grinding, rolling processing, etc. )
, and process route could be generated and should be put in final stage, the processed surface finish Ra0.
More than 8 um, slight collision will damage the surface, after finishing processing, with a flannelette, absolutely no direct contact with the workpiece by hand or other objects, in order to avoid surface finishing processing, due to the transportation and installation between the process and damage.
Large machining burr removing method?
Manual deburring the traditional way is to steel file, sandpaper, grinding head polishing.
The trimming knife gradually replaced the traditional method, simple and convenient to use, don't need to deal with the technology, cost saving and environmental protection.
Chemical deburring is electricity chemical reaction principle, parts made of metal materials automatically, selectively to complete assignments deburring.
It can be widely used in pneumatic, hydraulic, nozzle for engineering machinery, oil pump, automobile, engine, and other industries of different metal pump body, valve body, connecting rod, piston pin valve parts and other parts of the deburring processing.
Suitable for hard to remove internal burrs, after heat treatment and finish machining parts.
Electrochemical deburring is suitable for the removal of parts in the hidden part of cross hole or complex shape parts of burr, high production efficiency, deburring generally only a few seconds to tens of seconds.
This method is often used in gear, spline, connecting rod, body and crankshaft oil holes, such as deburring, and sharp corners round, etc.
The disadvantage is that parts of burr has also been electrolysis, near surface will lose their original luster, even affect the dimensional accuracy.
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