In the machining process of parts, or due to human or machine reasons, parts will be worn. Such finished products are unqualified, so we need to prevent these wear, so which factors will lead to wear? Let's take a look at the following small weaving.
1、 Phase change wear: when the parts are working at high temperature for a long time, the metal structure grains on the surface of the parts become larger, and small gaps are generated around the grain boundaries due to oxidation, which makes the parts fragile, reduces the wear resistance and accelerates the wear of the parts. Hydrodynamic wear: the wear on the part surface caused by the impact of liquid velocity or particle velocity on the part surface. Surface fatigue wear: under the action of alternating load, small cracks and pits are produced, which damage the parts. This kind of wear is related to the pressure, load characteristics, machine materials and dimension factors.
2、 Hot wear: in the process of friction, the metal surface wear and the internal matrix produce hot area or high temperature, which makes the parts temper and soften, burn and wrinkle. It often occurs in the high-speed and high-pressure sliding friction, and the damage of wear is relatively prominent, accompanied by the nature of accident wear. Corrosion and wear: the chemical corrosion causes wear, and the surface of parts is eroded by acid, alkali, salt liquid or harmful gas, or the surface of parts is combined with oxygen to generate hard and brittle metal oxide which is easy to fall off and wear parts.
3、 Running in wear: the corresponding wear of machinery under normal load, speed and lubrication conditions, which develops slowly. Hard particle wear: the abrasive particles falling from the part itself and the hard particles entering from the outside cause mechanical cutting or grinding and damage to the part.
4、 Causes of wear during machining and prevention methods:
(1) Deformation of basic parts: the deformation changes the relative position of each part, accelerates the wear of parts, and shortens the service life of parts. Reasonable installation and adjustment can be adopted to prevent deformation. Balance failure of parts: the high-speed rotating parts are unbalanced, which accelerates the damage of parts under the action of centrifugal force and shortens the service life of parts. Adopt strict action balance test measures to prevent.
(2) No running in: the mating surface of the replaced parts is not properly run in. As time goes on, the wear on the mating surface of the parts will increase and the service life of the parts will be shortened. The preventive measure is to run in the accessories. The material selection of the parts with low hardness for repair is improper, the surface hardness is not up to standard, or the heat treatment is unqualified. Preventive measures: select materials as required and conduct reasonable heat treatment. Repair or manufacturing quality fails to meet the design requirements: strict quality inspection. Violation of operation regulations: familiar with mechanical properties and operate carefully. Improper transportation, loading, unloading and storage: Master hoisting knowledge and operate carefully.
(3) Friction between parts: ensure the cleanness and lubrication of parts, wear caused by hard particles: keep the parts clean and cover the exposed parts. Fatigue wear of parts caused by long-term alternating load: eliminate clearance, select appropriate lubricating grease, reduce additional vibration and improve the accuracy of parts. Corrosion of chemical substances to parts: remove harmful chemical substances and improve the corrosion resistance of parts. Change of metallographic structure or matching property on the surface of parts under high temperature: try to improve working conditions, or use high temperature resistant and wear-resistant materials to make parts.
Dalian hanpujiang New Precision Machinery Co., Ltd. is a comprehensive machining and international trade enterprise mainly engaged in the design and manufacture of various jigs, precision machinery parts, machine tool parts and mould parts. Welcome to come for consultation.
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