Bearing heat treatment method in foreign machinery industry (below)

Core Tip: Bearing heat treatment method in foreign machinery industry (below) Abstract: Revitalize the industry position of equipment manufacturing industry Safe and environmentally controlled microbial growth A/B rotary working head inverter brake
Bearing heat treatment method in foreign machinery industry (below) Abstract: Revitalizing the industry status of equipment manufacturing industry Safe and environmentally controlled microbial growth A/B rotary working head Inverter braking new ideas, new methods Longitudinal wave method flaw detection quantitative analysis uncertainty High-precision milling processing technology and numerical control programming example High-performance grinding wheel dresser design and application High-efficiency CNC grinding AutoCAD-based planning library management system design and implementation Metal cutting new concept and soft soft starter energy saving principle CNC machine tool installation and commissioning CNC machine tools go to the information age Dalian has made breakthroughs in the research and development of cutting-edge CNC equipment. Metal cutting principle and tool vibration aging process principle Historical status and development trend of stainless steel electrode research at home and abroad Standard programming language CNC machine tool system composition and function processing method industry machinery foreign atmosphere cleaning equipment bearing cooling bearing heat treatment equipment 7.1 annealing equipment industrial developed countries as early as the 1960s and 1970s, the promotion of putter type roller-type isothermal spheroidizing furnace Shrink Annealing cycle annealing to improve the quality of energy saving bearing parts processing technology precision forging precision ring rolling process using parts rough machining precision turning technology to bring more and gradually extended protective atmosphere annealing needs of industrialized countries.

7 bearing heat treatment equipment

7.1 Annealing equipment

In the industrialized countries, as early as the 1960s and 1970s, push-rod and roller-type isothermal spheroidizing annealing furnaces were widely promoted to shorten the annealing cycle, save energy and improve annealing quality. With the development of bearing parts processing technology, precision forging and precision 辗 expansion (cold 辗) process, the processing precision of parts blanks is getting higher and higher, and gradually no less turning process is introduced, which brings about annealing of protective atmosphere. demand. Industrial developed countries have generally adopted protective atmosphere annealing to reduce the amount of machining after annealing, improve processing efficiency, save energy and reduce costs.

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Lubrication of plain bearings

Core Tip: The role of lubricant lubricants is to reduce frictional resistance, reduce wear, cooling and vibration absorption. Lubricants are liquid, solid and gas and semi-solid. Liquid lubricants are called lubricants.
Lubricant

The role of the lubricant is to reduce frictional resistance, reduce wear, cooling and vibration absorption. Lubricants are liquid, solid and gas and semi-solid. Liquid lubricants are called lubricating oils, semi-solid, at room temperature. The grease is grease.

Lubricant

Lubricating oil is the main lubricant. The main physical property index of lubricating oil is viscosity. Viscosity characterizes the internal friction property of liquid flow. The greater the viscosity, the worse the fluidity. Another physical property of the lubricating oil is oiliness, which characterizes the adsorption capacity of the lubricating oil on the metal surface. The greater the oiliness, the stronger the adsorption capacity for the metal, and the easier the oil film is formed. The choice of lubricating oil should take into account factors such as bearing capacity, journal rotation speed, lubrication method, and surface roughness of sliding bearings.
The general principles are as follows:

1. Under high-speed and light-load working conditions, in order to reduce frictional power consumption, a lubricant with a small viscosity can be selected;
2. Under heavy or shock load working conditions, oil with large oiliness and high viscosity should be used to form a stable lubricating film;
3, static pressure or dynamic and static pressure sliding bearings can choose a small viscosity lubricant;
4. Surfaces with rough or unrunned surfaces should be selected with high viscosity lubricants.

The selection of the viscosity of the lubricating oil for hydrodynamically lubricated bearings can be checked by calculation.

Grease

For plain bearings with a journal speed of less than 1 m/s to 2 m/s, grease can be used. The grease is blended with mineral oil, various thickeners (such as calcium, sodium, lithium, aluminum and other metal soaps) and water. The grease has a large consistency (needle penetration) and a large carrying capacity, but its physical and chemical properties are unstable. It should not be used under conditions of large temperature changes, and is often used in low-speed heavy-duty or oscillating bearings.
Solid lubricants and gas lubricants

Solid lubricants include graphite, molybdenum disulfide (MoS2) and polytetrafluoroethylene (PTFE). Generally used under heavy load conditions or under high temperature working conditions. Gas lubricants are commonly used in air, and are used at high speeds and in oils or greases.

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