Machine processed parts refer to mechanical components shaped using various machining equipment, mainly involving methods without significant chemical reactions. Mechanical machining comprises manual and CNC machining.
Manual machining involves operators manually operating machines like milling, lathe, drilling, and sawing machines to process various materials, suitable for small-batch, simple part production.
CNC machining, on the other hand, employs numerical control equipment, including machining centers, turning-milling centers, wire EDM machines, and thread cutting machines, for continuous processing, ideal for large-batch, complex-shaped parts.
Technical Requirements for Machining:
1.Tolerance Requirements:
(1) Geometric tolerances should comply with the requirements of GB1184-80.
(2) Length dimensions allow a deviation of ±0.5mm.
(3) Tolerance bands for castings are symmetrically arranged around the basic dimensions of the blank casting.
2.Requirements for Machined Parts:
(1) Parts should be inspected and accepted according to the process. Only after passing the previous process inspection can they proceed to the next process.
(2) Machined parts are not allowed to have burrs.
(3) Precision-machined parts should not be placed directly on the ground when stored but should be supported and protected as necessary. Machined surfaces should not have defects such as rust, impacts, scratches, etc., affecting performance, lifespan, or appearance.
(4) Surfaces processed by rolling should not peel after rolling.
(5) Parts subjected to final heat treatment should not have surface oxidation. Machined mating surfaces and tooth surfaces should not undergo annealing.
(6) Machined thread surfaces are not allowed to have defects such as black skin, impacts, mismatched threads, and burrs.
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