china cheapest four point contact ball slewing bearing supplier in 2022

1.What material are the parts of the four point contact ball slewing bearing？

The four point contact ball slewing bearing consists of inner ring, outer ring, rolling elements, seals, retainers, oil nozzles and other components. What we usually see are finished slewing bearings. What materials are used for the various parts of the slewing bearing What are the characteristics?

1. The inner ring and outer ring of the four point contact ball slewing bearing are made of surface-hardened steel. When the user has no special requirements, 50Mn steel or 42CrMo steel is generally used.

According to customer requirements, normalizing or quenching and tempering is usually performed to improve the mechanical properties of the forgings, but sometimes In order to meet the needs of special applications, other materials can also be selected according to the specific requirements of users, such as aluminum, stainless steel, etc.

2. The rolling elements refer to the steel balls and rollers. The rolling elements of the slewing bearing are generally made of high-carbon chromium bearing steel, the grade is GCr15, and the overall quenching is used to achieve higher hardness.

3. The sealing material, the slewing bearing seal is generally made of oil-resistant nitrile-butadiene rubber NBR, which is suitable for most use environments. According to different operating temperatures, low-temperature-resistant low-temperature silicone rubber seals and high-temperature-resistant fluororubber seals can also be selected.

4. Cage material, the cage of the four point contact ball slewing bearing has a variety of structural types and materials, and the appropriate cage is selected according to the specific use conditions.

The integral and segmented cages are made of No. 20 steel and No. 45 steel or ZL102 cast aluminum alloy, brass, nylon and other materials; the isolation block type is made of polyamide 1010 resin, nylon, brass, etc.

5. Grease nozzles are generally made of brass and stainless steel.

The four point contact ball slewing bearing selects different parts and materials according to different working conditions. The general principle is to ensure that the slewing bearing is suitable first, and can meet the requirements of users in all aspects. On the premise of ensuring the application, try to choose common materials to reduce costs. , Save money for customers and make cost-effective slewing bearings.

2.What problems will affect the service life of the four point contact ball slewing bearing?

Four point contact ball slewing bearing is an important core component of equipment rotation. If the slewing bearing fails during the operation of the equipment and cannot rotate normally, it will cause equipment downtime and production paralysis.

It is generally very troublesome to replace the slewing bearing, so everyone generally chooses a slewing bearing with reliable quality. The bearing is installed on its own equipment. After the slewing bearing is installed, everyone hopes that the slewing bearing can work stably and reliably, and the longer the service life, the better. What are the factors that affect the life of the slewing bearing?

1. The problem of the equipment itself

1. The rigidity of the equipment installation foundation is insufficient. When the four point contact ball slewing bearing is running under heavy load, the rigidity of the equipment installation foundation cannot provide a good support for the slewing bearing, resulting in elastic deformation of the slewing bearing, uneven force when the slewing bearing rotates, and long-term use. It will cause damage to the slewing bearing and affect the service life.

2. The flatness of the installation foundation is not good. There will be a gap between the slewing bearing and the installation foundation during installation. The correct way is to use a gasket with a suitable height to level the gap, but the operator often ignores this during installation and use. ,

In this case, the slewing bearing will warp and deform after the bolt is pressed, causing the channel to be deformed. After the deformation, the channel and the steel ball are not in good contact, and the clearance value is not uniform and the rotation is inflexible, which affects the use of the slewing bearing. life.

2. Overload operation

When the slewing bearing is designed, the bearing capacity has been clarified, such as how much load and how much overturning moment it can bear. If the actual load exceeds the bearing capacity of the slewing bearing during use, it belongs to overload operation. During overload operation, the load on the steel ball exceeds the limit load, and there will be collapse blocks, fatigue spalling, and craters in the raceway.

The collapse will cause serious damage to the slewing bearing. It is possible that a short-term overload operation will cause devastating damage to the slewing bearing, which will seriously affect the service life of the slewing bearing, and overload operation may easily lead to safety accidents.

3. Pollution

Pollution can also lead to premature damage of the slewing bearing. Pollution means that dust particles, water, etc. enter the bearing raceway, or foreign matter enters the tooth meshing of the slewing bearing. Damage to the slewing bearing, contaminants will also cause the slewing bearing to corrode, resulting in the deterioration of the grease, which will shorten the life of the slewing bearing.

4. Lubrication

The lubrication system can reduce the friction coefficient when the four point contact ball slewing bearing is running, achieve very small rolling friction or sliding friction, and also prevent the four point contact ball slewing bearing from rusting. Damaged teeth and lack of long-term lubrication are one of the main causes of premature failure of slewing ring bearings.