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| Machining principles and precautions
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Machining the name suggests is to make use of mechanical processing, then we use when machining what needs attention, and what is it processed before principle ? Here we take a look at the specific :
A mechanical processing safety precautions are:
1, the positioning accuracy and reliability , to prevent vibration will produce a slight malfunction.
2 , handle, hand wheel , the structure and the arrangement position of the button to be specified. Start button should be installed in the chassis or fitted to prevent accidental touches the retaining ring . Mounted on the shaft rod hand wheels, handles the automatic feed , it will hurt with the axis of rotation , so prolapse device should be installed automatically .
3 , install the necessary interlock mechanism to prevent the operation member uncoordinated , uncoordinated operation and multiplayer accident occurs .
4 , easy to operate , reducing back and forth , to avoid unnecessary bending, tiptoe action .
5, the direction of movement of the machine equipment and the operating member is operated to meet the required direction of movement of parts , and simple sign flag .
Second, the mechanical processing principles as follows :
1 , a reasonable choice of equipment . Mainly rough cut most allowance , does not require a higher precision, higher power should be so rough , high accuracy on the machine , finishing step with a higher precision is required machining . Roughing and finishing were processed on a different machine , both full equipment capacity , but also to extend the service life of precision machine tools .
2 , in order to ensure accuracy , rough and finish preferably separately . Because roughing, cutting capacity, cutting forces suffered workpiece clamping force, heat and more, as well as more significant machined surface hardening phenomenon , there is a large workpiece internal stress, if rough, finishing continuously, then after finishing precision parts because of stress redistribution lost quickly . For some high precision machining parts, after the roughing and finishing before , you should also arrange low-temperature annealing or aging treatment process to eliminate internal stress.
3 , the placement of the heat treatment process is as follows: To improve metal cutting properties, such as annealing, normalizing , quenching , etc., usually arranged before machining , to eliminate stress, such as aging, quenching and tempering treatment , etc., generally arrangements after roughing , finishing before . In order to improve the mechanical properties of parts , such as carburizing , quenching, and tempering , the general arrangements after mechanical machining . If large deformation after heat treatment , must arrange the final processing step . |
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