The normalizing structure can also be used as a classification method for alloy steel. Used to make measuring tools, cutting tools and rolling bearings, etc. In order to reduce the brittleness of steel parts, the quenched steel parts are kept at an appropriate temperature higher than room temperature and lower than 650°C for a long time, and then cooled.
In production, it is often based on the performance requirements of the workpiece. Generally, it should not be tempered in this temperature range. The main methods of chemical heat treatment are carburizing, nitriding and metalizing. For low-carbon steel and low-carbon low-alloy steel, normalizing can be used to obtain more flake pearlite structure, increase the hardness to HB140-190, avoid the 'sticky knife' phenomenon during cutting, and improve the machinability .
After infiltration of elements, other heat treatment processes such as quenching and tempering are sometimes Mechanical ball bearing manufacturers required. For medium carbon steel, it is more economical and convenient to use normalizing when both normalizing and annealing are available. The difference between annealing and tempering The difference between annealing and tempering is: (simply put, annealing means that hardness is not required, and tempering still retains a certain hardness).
Therefore, steel workpieces are generally tempered after quenching. The difference between chemical heat treatment and surface heat treatment is that the latter changes the chemical composition of the surface of the workpiece. The method of effectively and closely combining pressure processing deformation and heat treatment to obtain good strength and toughness of the workpiece is called thermomechanical heat treatment; heat treatment in a negative pressure atmosphere or vacuum is called vacuum heat treatment, which can not only make
According to investigations, poor lubrication is one of the main causes of premature bearing damage. This is very common in some small machine tool factories. It is common for bearings to fail during operation, so there is no need to make a fuss. enter the inside of the bearing.
The main reasons include: failure to fill lubricant or lubricating oil in time; failure to fill lubricant or lubricating oil in place; improper selection of lubricant or lubricating oil; incorrect lubrication method, etc. Using professional bearing installation tools can avoid this. Therefore, when installing the bearing, it is necessary to ensure that the contact angle is qualified, but also that the actual width of the angular contact ball bearing meets the requirements.
Recommendation: Choose the correct lubricant or lubricating oil, and use the correct lubrication filling method. Let's analyze the common quality problems and causes of inclined Clutch Release Bearings rail CNC lathe bearings. the installation is not in place, the installation is deviation or not installed in the bearing position, resulting in too small bearing clearance.
The main reasons include: opening the bearing packaging too early before use, causing pollution; the working environment is not clean during installation, causing pollution; the working environment of the bearing is not clean, and the working medium is polluted.
Pollution means that sand, dust, metal chips, etc. Recommendation: Do not unpack the bearing before use; keep the installation environment clean during installation and clean the bearing to be used; strengthen the sealing device of the bearing. Using brute force during installation, directly hitting the bearing with a hammer will cause greater damage to the bearing; it is the main cause of deformation
Therefore, the spherical roller bearing material needs to have corrosion resistance. For metallic materials, the one with low hardness and low modulus of elasticity has good clamping properties, while non-metallic materials, such as carbon graphite, have low elastic modulus but poor clamping properties.
Cavitation resistance When the solid is moving relative to the liquid, when the bubbles in the liquid rupture near the solid surface, local impact high pressure or local high temperature will be generated, which will cause cavitation wear. Based on the understanding of TG agent bearing brand, tell everyone what advantages TG agent bearing will have when using it. Wear resistance The ability of a pair of materials to resist wear. Spherical roller bearings usually use softer and harder materials to form the friction width, and generally use softer materials as bearing bushes. Fatigue resistance The ability of the material to resist fatigue damage under cyclic loading.
At the service temperature, the strength, hardness, impact strength and uniformity of the bearing material are very important for fatigue resistance. Under specified wear conditions, wear resistance is expressed by the reciprocal of wear rate or wear degree and wear amount. The material relies on the elastoplastic deformation of the surface to compensate for the initial poor fit of the sliding friction surface and the deflection performance of the shaft.
In the process of running-in between the shaft diameter and the bearing bush, the ability to reduce the machining error of the shaft diameter and the bearing bush, the concentricity error, and the surface roughness parameter value to make the contact uniform, thereby reducing the friction and wear rate. achievement. Materials with low modulus of elasticity have better compliance.As a domestic brand bearing, with my country's breakthrough and realization of bearing materials, the quality of domestic bearings is more and more on the same level as that of international bearings. Lubricating oil will gradually oxidize when used in the atmosphere to produce acidic substances, and most lubricating oils Mechanical ball bearing Factory also contain extreme pressure additives, which will corrode the bearing material.
Corrosion resistance The ability of the material to resist corrosion. Compressive strength The ability to withstand one-way load without being crushed or the size unchanged. Recently, my country has a great deal of high-end bearings and bearing steel materials. Generally, copper-lead alloys, tin-based spherical roller bearing alloys, and aluminum-zinc-silicon alloys have better cavitation resistance. The ability of a material to resist cavitation wear is called cavitation resistance. Materials with good running-in and clamp-in properties usually have poor fatigue resistance. Clamping The ability of the material to allow foreign hard particles in the lubricant to be clamped in to prevent scratches or (and) abrasive wear
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