Several key problems affecting the slewing rings manufacturing

Slewing ring Bearings are commonly used in modern industrial components, compact structure, convenient guide rotation, simple installation, easy maintenance, which is widely used in lifting the transport machinery, mining machine, construction machinery, port machinery, wind power generation, medical equipment, the radar and missile launcher and other large rotary device. FRB Bearings would briefly introduce, the several key problems affecting slewing ring manufacturing.

Slewing ring bearings manufacturing furnace temperature and heating speed
1. Carbon steel, alloy steel, normalizing furnace charging requirements bottoms in less than or equal to the processing temperature furnace, the furnace temperature, alloy structural steel, alloy tool steel annealing requirements under 550 ℃ furnace charging, along with the furnace heating up.

2. High speed steel and complex differential cross section larger easy low temperature furnace charging, and mean temperature between 550-700 ℃ with the furnace heating up after 1 to 2 hours.

How to select crane slewing bearing type ?

Slewing ring bearings is a bearing that can bear a lot of weight, often used in different industries.And there are many types of swing bearing, different types have different use case.But generally speaking, slewing ring are more used in construction machinery, so what type of slewing bearings should be used by cranes?

FRB BEARINGS technology personnel according to their years of related experience, according to crane is a large machinery, so choosing the slewing bearing must have a lot of tolerance, and compact structure.Therefore, the crane slewing bearing can choose three rows of roller type turntable bearing, single-row four-point contact ball type slewing ring, which can increase the overall contact area and withstand various loads at the same time. The diameter of this type slewing ring bearing is also large, which is specially used for heavy machinery equipment.

Agricultural machinery slewing ring bearings

FRB agricultural machinery slewing ring structure is characterized by using flange Bearings, formed in the ring raceway for single row ball bearing, with a full, no gasket.These slewing bearings are neither toothed nor provided with washers and are provided with a surface coating to prevent corrosion.

Benefits:
Low speed rotation, single volleyball flanged slewing bearings for filling machines can withstand axial loads of up to several hundred kilograms.

Special technical features:
FRB Bearings agricultural machinery slewing bearing must be fixed hole, used to install bolts, or ring can be directly welded to the supporting frame.

How to repair slewing bearings raceway peeling layer and the tooth ring broken tooth?

Slewing bearings is a kind of large bearing which can bear comprehensive load.However, this part has been used for a long time. Due to the manufacturing quality problems such as the material pores or interlayers, the hardness of the hardened layer and uneven depth of the raceway, etc., or some external reasons, the raceway peeling layer or the tooth ring broken tooth, the equipment cannot work normally.How to fix it?Let me explain to you today!

For raceway stripping, the first to make a correct judgment.The appearance of peeling layer, generally in the outside is not easy to see.Generally, the raceway has stripping layer: when the main engine is carrying the rotation, the raceway has a "cro-crook" sound, and the rotating speed is not uniform or a certain azimuth speed slows down significantly with slight vibration;Too high temperature rise or too high current;Key slots of rotary motors and hydraulic couplers or coupling etc. are jammed.

How to quickly remove the rust on the slewing bearings?

Slewing bearings is widely used and is one of the new mechanical parts.Sometimes, rust will be unavoidable during the slewing bearings operation. How to deal with it?Today we will introduce a few quick rust removal methods.You can refer to that.

The slewing bearings rust will not only affect the appearance of accessories, but also affect the slewing bearings normal use.Therefore, it is necessary to remove rust from slewing bearings.The following methods can be used:

Discussion on changing technology of large slewing bearing of bucket turbine

Bucket turbine is the main equipment of the coal conveying system, and the  operation status of bucket turbine directly affects the load of the  unit.Large slewing bearing is an important part of bucket turbine rotary  mechanism. After the slewing bearing is damaged, how to replace it safely  and with high quality in a short time is the main purpose of this paper.  This paper analyses the cause of damage of large slewing bearing and  introduces emphatically the technology of "jacking method" to replace large  slewing bearing of bucket turbine. This method is used to replace the big  bearing of DQL1200/1600-30 type bucket turbine of shentou NO.2 power plant.  The practice proves that this method is successful. The construction period  is only 6 days and the cost is 100,000 yuan. More than 1 year of operation  after replacement, stable rotation, good meshing of big and small gears,  normal operation and rated output.

The reasons for turbine large slewing bearing damage are as follows:
(1) Big bearing has been in service for 12 years, with a long cycle.  Defects were exposed as early as 2001 when it was overhauled.

3 factors let you know which factors affect the slewing bearing service life?

The main factors influencing the slewing bearing service life are structural design, manufacturing process and materials.

First of all, the slewing bearing structure design is reasonable, so that the swing bearing has a good life.slewing bearing is after forging, heat treatment, turning, grinding and assembly, and other processes.The rationality, progressiveness and stability of each machining process also affect the slewing bearing life.

4 factors for influence slewing bearing capacity

Slewing ring failure form has two kinds, one is the raceway damage, the  second is broken teeth, and the raceway damage accounted for the proportion  of over 98%, so FRB Bearings said, the raceway quality is the core of the  quality of slewing bearing, there are many factors influencing the quality  of the slewing ring raceway.Among them, the raceway hardnesss, raceway  hardener depth,raceway radius of curvatureand and aceway contact angle are  undoubtedly the most important four influencing factors.They affect the  quality of the raceway in different ways and determine the bearing capacity  and service life of the slewing bearings.

Raceway hardness
The hardening hardness of the slewing bearing raceway has a great impact on  its rated static capacity. The minimum hardness specified in the standard  is HRC55, and the actual average quenching hardness is usually around  HRC57. Therefore, the actual bearing capacity of most of the slewing  bearing is higher than the theoretical value calculated according to  HRC55.When the hardness is lower than HRC53, even if the safety factor of  1.2 is left, it is not safe to use. In particular, when the hardness is  only HRC50, the safety factor of 1.7 is useless, which is very  dangerous.Lack of hardness can easily cause the failure of slewing bearing,  from the beginning of the pitting on the surface of the raceway to the end  of collapse.

What are the used screws requirements in building mechanical slewing bearings?

It is well known that slewing bearings are used in many fields and are also  one of the most important construction machinery parts.To ensure the safe  operation of slewing ring, the whole process of production and installation  of slewing bearings is often involved.FRB Bearings will introduce what are  the used screws requirements in building mechanical slewing bearings?, come  together to understand!

1. Requirements for bolts used:
The size of bolts used shall conform to the regulations of GB/ T5782-2000  and GB/ T5783-2000, and the strength grade shall not be lower than the 8.8  level specified in GB/ T3098.1-2000, and the proper strength grade shall be  selected according to the bearing capacity.So make sure you choose the  right bolt.That's how it works.

2. Operating standard of nuts:
The size of nuts shall comply with the provisions of GB/ T6170-2000 and GB/  T6175-2000, and their mechanical properties shall comply with the  provisions of GB/ T3098.2-2000.Therefore, the standard of nut use is also  very strict, which should be noted.

How is the slewing bearing sealed at high temperature?

Slewing bearing is an important part of mechanical equipment, which is not only used in engineering machinery, but also widely used in port, military, wharf and other fields.But now many friends are asking about the slewing bearing at high temperature if the bearing is sealed.Here, FRB BEARINGS are simple to talk about.

The slewing bearing is mainly composed of upper ring, lower ring and a full complement ball.These two single row and double row designs, as well as the convenience of pre-drilled mounting holes.In real life, some bearings are only tightened at the fixed blade end, some are tightened at both the fixed blade end and the moving blade end, the way of tightening is cylinder type, there are also institutional linkage.Under the working environment of heavy load and low speed, the bearing is sealed by rubber sealing ring or labyrinth seal.

What's the selection principle of slewing bearing steel?

When designing and manufacturing rolling bearings, What's the selection  principle of slewing bearing steel?The following principles are generally  followed to select bearing materials.

1. According to bearing working conditions
1) Operating temperature: bearings working at normal temperature, using  chrome bearing steel.Working temperature higher than 150 ℃ lower than 250  ℃ using chromium bearing steel, but with special heat treatment (200 ℃ or  300 ℃ tempering required).

2) Size of impact load: bearing under strong impact load, generally not  using chrome bearing steel, most of the high quality carburized structural  steel, impact tool steel or tempered structural steel.

3) Contact media: bearings used in corrosive media must be made of  corrosion-resistant steel or alloy steel with good corrosion  resistance.Structural steel, shock resistant tool steel or tempered  structural steel.

What's the matter need to notice before the slewing bearing installation?

Turntable bearing usually consists of four parts: inner ring, outer ring, roller, spacer, etc.Because the core component adopts slewing bearings, it can bear axial force and radial force at the same time.It has many forms, but its structure is basically the same.Swing bearing is widely used in life, it is an indispensable part in people's life. So, what's the matter need to notice before the slewing bearing installation?Learn from FRB BEARINGS.

Before installing slewing ring bearings, you need to know the following methods:

What are the methods to prevent quenching crack of slewing bearings?

Cracks sometimes occur in the slewing bearing during quenching or at room temperature after quenching.Also called quenching crack of slewing ring.There are many reasons for quenching cracking of swing bearing. When analyzing quenching crack, it should be distinguished according to the crack characteristics of slewing bearing.Today, small editor to give you a key introduction to prevent swing bearing quenching crack methods.Let's study together!

1. Proper design of slewing bearing products - the design should be based on the working conditions, service requirements and reasonable design of the section size of swing bearing, correct selection of materials, in the structural design, as far as possible to meet the requirements of heat treatment technology on the slewing ring structure;

5 Points replace and disassemble the slewing bearing of excavator

The importance of the slewing ring of excavator in machinery is unspeakable.In addition, the slewing bearing is indispensable in excavator and is prone to  various faults. For a period of time, new bearings should be replaced.Therefore, today FRB Bearings said that 5 Points replace and disassemble the slewing  bearing of excavator.

5 Points replace and disassemble the slewing bearing of excavator:

Supply FRB KDL.A.0744.00.10 external tooth inner flange slewing bearings

FRB BEARINGS was founded in 2009, is one specialized is engaged in the large and super large slewing bearings and non-standard bearing design, development, manufacture, the sale is a body comprehensive enterprise.Our company has a team of experienced bearing designers and technicians. The bearing design is all designed by bearing design software, and the drawings required by customers can be designed in a short time.

FRB BEARINGS mainly produces inner diameter at 200 mm to 6000 mm slewing bearings, slewing drive, crossed roller bearings, thin section ball bearings, tapered roller bearing and other bearing, the machining accuracy of P4 level.Products are widely used in precision machine tools, ports, mines, medical treatment, coal, cement, oil drilling, wind power generation, shield machines and defense industries.

What is the suitable temperature and working environment of the slewing bearing?

Slewing bearing in the machinery industry is known as the "joint" machine, is the relative motion between two objects, can withstand the axial force and radial force and overturning moment necessary important mechanical transmission of the original.

Swing bearing track and gear heat treatment:
The raceway of slewing ring is quenched by surface induction, and the quenching hardness is ensured to reach sufficient depth of hardened layer in HRC55 ~ 62.

KD210series flanged slewing ring231.20.0900.013Typ21-1050.0

The KD210 series bearings have flanges on one or two rings with dimensions ranging from 500 mm to 1200mm.Flange design reduces weight and allows device designers to more flexibly design the shape of adjacent mounting structures and the arrangement of bolts.RK series are suitable for a variety of applications when large size and light weight are the dominant factors in selecting bearing.The design features a deep groove raceway, which allows the bearing to bear radial, axial and torque loads at the same time.The spacing between the spacer ball and the bearing ball can reduce the torque of the rotation resistance, and the better performance can be obtained in the case of swinging motion.Perfect phase seal to help remove contaminants.

KD210 series bearing in light load, medium load cases have a wide range of applications, including: handling robot, packaging robot, painting robot, small crane, derrick and elevators, the industrial position sensor and rotary table, rotating chute, stretch wrapping machine, bottling machine, conveyor and related handling equipment, rotating display and so on.

Kaydon brand MT series slewing bearing MTE/STE-324T

The bearing section of MT series turntable bearings is rectangular, with dimensions ranging from 4 inches to 47 inches, 100 to 1,200 mm.This series of products is the most cost-effective.The internal structure of the bearing includes deep groove raceway and maximum size ball.This structure enables the series to withstand higher torque, thrust, and radial loads than typical four-point contact ball bearings.The bearing groove has a larger size of perfect seal and non-contact dust cover, which has certain effect on preventing pollutants.This design enables the series to perform well in many applications from light to heavy loads.

INA brand four-point contact ball slewing bearing VLU200544-N

Slewing ring is a kind of large bearing which can bear comprehensive load and can bear large axial, radial load and overturning moment at the same time.slewing bearing are generally equipped with mounting holes, internal or external gears, lubricating oil holes and sealing devices, which can make the design of the main engine compact, easy to guide and easy to maintain.

Turntable bearings in the real industrial application is very extensive, known as: "the machine is mainly should implement the joint", its use is widely used in: crane, rail crane, port cranes, deck cranes, metallurgical cranes, container cranes, excavators, filling machine, and CT machine standing wave therapy apparatus, navigation instrument, radar antenna, tanks and robots, and revolving restaurant, etc.