China Luoyang Factory Supplier-Slewing Bearing Operating Temperature

What is the slewing bearing operating temperature?

The slewing bearing is a very important part in the machine. Basically, every machine needs this part. Because this part is relatively fragile, it can also be regarded as a kind of consumables. You need to buy it frequently to keep the machine in good condition. normal operation. Let’s take a look at the slewing bearing operating temperature.

The slewing bearing opearing temperature can work normally at -300C～+700C. If the user needs to adapt to the lower or higher temperature slewing bearing, our company can make special design.

If the slewing bearing operating temperature is used in particularly harsh environments, such as marine climate, dust or abrasive particles, sand, cement, coal powder, etc.

Special sealing rings, protective devices, and suitable oil passages should be selected. Therefore, in order to make your support function normally, it is hoped to do a good job in daily maintenance and maintenance.

The tooth surface of the slewing bearing operating temperature should be cleaned and changed every 8-10 working days, and foreign matter should not be mixed.

Characteristics of slewing bearing materials

The slewing bearing is mainly composed of ferrules, rolling elements, cages, sealing rings, etc. Since different parts have special functions in practical applications, there are different considerations in the design and selection of materials.

In general, the rolling elements of the slewing ring are made of carbon-chromium bearing steel that is hardened as a whole. The slewing bearing ring is made of surface hardened steel.

When the user has no special requirements, it is generally made of 50Mn steel, but sometimes in order to meet the needs of the host in some special applications, other grades of surface can also be selected according to the specific conditions provided by the user. Hardened steel, such as 42CrMo, 5CrMnMo, etc.

For small and medium slewing bearing forgings, round or square bars are used as blanks. The grain structure and mechanical properties of the bar are uniform and good, the shape and size are accurate, and the surface quality is good, which is convenient for mass production.

As long as the slewing bearing operating temperature and deformation conditions are reasonably controlled, forgings with excellent performance can be forged without large forging deformation.

Ingots are only used for large forgings. The ingot is an as-cast structure with large columnar crystals and a loose center.

Therefore, through large plastic deformation, the columnar crystals must be broken into fine grains, and the loose compaction can be obtained in order to obtain excellent metal structure and mechanical properties.

The cages for slewing bearings have integral, segmented, spacer block and other structural forms. The integral and segmented cages are made of 20-gauge steel or ZL102 cast aluminum alloy.

The spacer block type is made of polyamide 1010 resin, ZL102 cast aluminum alloy, etc. With the continuous development of the material industry, nylon GRPA66.25 has also been popularized and applied in the design of segmented cages.

The material of the slewing ring seal is made of oil-resistant nitrile rubber. The codes of the ferrule material and the supply state of the blank are as specified in the table. In the table, “T” means that the ring blank is supplied in a quenched and tempered state, and “Z” means that the ring blank is supplied in a normalized state.

Slewing ring adapts to temperature and working environment

Slewing rings operating temperature can work normally from – 300C to + 700C. If users need to adapt to lower or higher temperature slewing rings, our company can make a special design.

If the slewing bearing operating temperature is used in particularly harsh environments, such as marine climate, dust or abrasive particles, sand, cement, pulverized coal, etc.

A special sealing ring, protective device, and proper oil passage must be selected. Therefore, in order to make your support work normally, we hope to do a good job in daily maintenance.

There are 4 types of slewing bearings:

a. Single row four-point contact ball slewing bearing:

It is composed of two seat rings, compact structure, lightweight, four-point contact between steel ball and circular arc raceway, and can bear axial force, radial force, and overturning moment at the same time. Small and medium cranes can be selected.

b. Double-row ball slewing bearing:

The double volleyball slewing bearing has three seats, and the steel balls and isolation blocks can be directly discharged into the upper and lower raceways. This kind of open assembly is very convenient.

The bearing angles of the upper and lower circular raceways are all 90 ° and can bear large axial force and overturning moments. It is especially suitable for tower cranes with a medium diameter or above.

c. Single-row crossed roller slewing bearing:

The single-row cross roller slewing bearing is composed of two seat rings, with compact structure, lightweight, high manufacturing accuracy, small assembly clearance, and high installation accuracy requirements.

The roller is 1:1 cross arrangement, which can bear axial force, overturning moment, and large radial force at the same time.

d. Three-row roller slewing bearing:

The three-row roller slewing bearing has three seats, and the upper, lower, and radial raceways are separated respectively so that a load of each row of rollers can be determined accurately.

It can bear all kinds of loads at the same time. It is one of the four products with the largest bearing capacity. The shaft and radial dimensions are large, and the structure is firm. It is especially suitable for heavy machinery requiring a large diameter.