The machined surface quality of precision mechanical parts includes the geometric shape characteristics of the machined surface and the changes in the machined surface materials. In addition to understanding the five stages of precision mechanical parts processing and how to improve the efficiency of precision mechanical parts processing, we should also know that the machined surface of precision mechanical parts actually has different degrees of machining errors such as hardness and cracks, The surface of mechanical parts is difficult to achieve the ideal smooth surface, which will have a great impact on the fitting accuracy, wear resistance, corrosion resistance and fatigue strength of precision mechanical parts, and will affect the service life of mechanical equipment to a certain extent.
1. Affect the fitting accuracy of mechanical parts
The large roughness of the machined surface of precision mechanical parts will reduce the fitting accuracy between parts to a certain extent. If there is a large residual stress on the machined surface, the stability of the fitting accuracy between parts will be seriously affected.
2. Affect the wear resistance of mechanical parts
The machined surface roughness of precision mechanical parts is large, resulting in the increase of contact surface pressure. The peaks between the surfaces bite, crack and cut off each other, which aggravates the wear of the parts surface. The machined surface of precision mechanical parts is too smooth, the lubricating oil reservoir is not stable, and the contact surface between parts cannot be covered, which is prone to molecular bonding, and also easy to aggravate the wear of the surface of parts.
3. Affect the abrasion resistance of mechanical parts
The greater the surface roughness of precision mechanical parts, the easier it is to accumulate abrasive substances. The deeper the valley, the stronger the penetration and corrosion.
4. Influence the fatigue strength of mechanical parts
The greater the machined surface roughness of precision mechanical parts, the worse their fatigue damage resistance. Under the action of alternating load, the concave parts of the surface roughness of mechanical parts are easy to cause stress concentration and fatigue cracks. The smaller the roughness of the machined surface, the fewer the defects. The better the fatigue resistance of the mechanical parts. The greater the roughness, the deeper the wrinkles on the surface of the mechanical parts. The smaller the radius of the bottom of the wrinkles, the worse the fatigue resistance.
The machined surface quality of precision mechanical parts will have a certain impact on the matching accuracy, wear resistance, corrosion resistance and fatigue strength of mechanical parts. Therefore, when machining precision mechanical parts, the surface roughness of mechanical parts should reach an appropriate level as far as possible, which can better extend the service life of mechanical equipment and reduce the failure repair rate of mechanical equipment.