How to prevent the wear of mechanical parts during processing

Release time:

2023-12-11 09:04

1. phase change wear: mechanical processing sharing parts work at high temperature for a long time, the grain size of the metal structure on the surface of the parts becomes larger, and the oxidation around the grain boundary produces small gaps, which makes the parts fragile, reduces the wear resistance, and accelerates the wear of the parts. Hydrodynamic wear: The wear of the surface of a part caused by the impact of liquid velocity or particle velocity on the surface of the part. Surface fatigue wear: under the action of alternating load, tiny cracks and pits are generated, which damage the parts. This kind of wear is related to the pressure size, load characteristics, machine material and size.
2. thermal wear: During the friction process of the parts, the metal surface is worn and the internal matrix generates hot zones or high temperatures, causing the parts to have tempering softening, burning wrinkles, etc., which often occur in high-speed and high-pressure sliding friction. The destructive nature is more prominent, and accompanied by accidental wear. Corrosion and wear: chemical corrosion causes wear, the surface of the parts is eroded by acid, alkali, salt liquid or harmful gas, or the surface of the parts is combined with oxygen to generate hard and brittle metal oxides that are easy to fall off and wear the parts.
3. running wear: the corresponding wear of machinery under normal load, speed and lubrication conditions, which develops very slowly. Hard grain wear: the abrasive grains falling from the part itself and the hard grains entering the outside world cause mechanical cutting or grinding and destroy the parts.
4. machining wear causes and prevention methods:
(1) Deformation of basic parts: Due to the deformation, the relative position of each part is changed, which accelerates the wear of the parts and shortens the life of the parts. Can take reasonable installation and adjustment, deformation prevention. Parts balance damage: High-speed rotating parts are unbalanced, which accelerates parts damage under the action of centrifugal force and shortens the life of parts. Strict dynamic balance test measures shall be adopted for prevention.
(2) No running-in: the mating surface of the replaced parts is not reasonably run-in. As time goes on, the wear of the mating surface of the parts will increase and the life of the parts will be shortened. The precaution is to run-in the fittings. Low hardness repair parts improper material selection, surface hardness is not up to, or heat treatment is not qualified. Preventive measures: select materials as required and conduct reasonable heat treatment. Repair or manufacturing quality does not meet the design requirements: strict quality inspection. Violation of operating procedures: familiar with mechanical properties, careful operation. Improper transportation, loading and unloading and storage: master hoisting knowledge and operate carefully.
(3) Mutual friction between parts: to ensure the cleanliness and lubrication of parts, wear caused by hard particles: to keep the parts clean and cover the exposed parts. Fatigue wear of parts under long-term alternating load: eliminate gaps, select appropriate lubricating grease, reduce additional vibration, and improve parts accuracy. Corrosion of chemical substances on parts: remove harmful chemical substances and improve the corrosion resistance of parts. Under high temperature conditions, the surface metallographic structure changes or with the nature of the change: try to improve the working conditions, or the use of high temperature, wear-resistant materials to make parts.