The influence of surface roughness of precision metal processing parts assembly precision machinery parts processing quality evaluation, in addition to the size to control design on the drawing tolerance range.
And the surface roughness also should comply with the design requirements.
If the roughness is unqualified, will cause the assembly department.
When two parts cooperate will rub against each other, if precision metal surface processing was rough, then only the parts surface some convex peak contact each other, but not all cooperate with surface contact, because the actual contact area is small, so a lot of pressure on unit area.
When precision metal processing parts rubbing against each other, soon be crushed flat surface convex peak, cause severe wear, which affects with nature, the rough surface clearance, its corrosion resistance than smooth surface is poor, corrosive materials easily assembled in the valley of the rough surface and cracks, and gradually expand its corrosion effect.
At the same time, under the effect of external force, the rough surface easy to produce stress concentration, make the precision metal surface processing produces microcrack, reduce the fatigue strength.
Test surface, in the absence of cold work hardening layer and the residual stress, the smaller the surface roughness, precision parts
and components is more close to the fatigue strength of substrate material.
Surface of cold work hardening is usually work on room temperature the precision of parts is relatively good, sometimes can improve the fatigue strength, but is bad for work under the high temperature parts, precision metal processing parts surface hardness in high temperature under the action of change, the parts surface residual stress relaxation, will happen in the plastic deformation layer of atomic diffusion rate will increase, resulting in alloy elements accelerated oxidation and grain boundary layer bate, at this point, the deeper the cold work hardening layer, the degree of cold work hardening is larger, the higher the temperature, the longer the time, the change process in the plastic deformation layer is more intense, resulting in precision metal processing parts along the cold work hardening layer formed on the surface of grain boundary initial crack.
Initial crack extension will be further fatigue crack, so that the parts fatigue strength decreased.
Machining surface hardening after reinforcement degree depends on the metal cutting process, the combination of weakening and phase-change effect as a result, when the strong deformation plays a leading role in the process of cutting, has processing surface produces work hardening;
But when the cutting temperature play a leading role, often cause precision metal processing parts surface hardness and phase transformation.
Therefore, the increase in the processing deformation and friction will be intensified work hardening phenomenon, and high temperature, low melting point of workpiece materials can reduce the effect of cold work hardening.
The above information is derived from the precision metal processing factory in shenzhen Xavier company, more products please click on the link to see http://www for details.
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