slewing bearing 

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is a common mechanical parts that support and rotate large structures, such as bridges, buildings, and wind turbines. Rotary support is composed of parts of the internal and external ring, rolling body, maintenance frame and sealing circle. The choice of material is essential for its performance and life. In this article, we will explore the materials and characteristics of common rotation support in order to better understand this important mechanical parts.

The material of the backbone support

1. Carbon steel

Carbon steel is a common rotary support material. Its main feature is low price, high strength, easy processing and heat treatment. Carbon steel rotation branches are suitable for small and medium -sized structures, such as excavators, cranes, etc. However, carbon steel is easy to rust and requires regular anti -rust oil to extend the service life.

2. Alloy steel

Compared with carbon steel, alloy steel rotation branches have higher strength and better corrosion resistance. Its additional elements can improve its hardness, toughness and abrasion resistance, and make it more suitable for large structures with high load and high -speed rotation, such as cranes and building rotation towers. The price of alloy steel rotation support is relatively high, but its long life and less maintenance needs can reduce the overall cost in long -term use.
Rotary support 3. Stainless steel

The stainless steel rotation support has good corrosion resistance and high strength. It is suitable for the structure of working in a humid and corrosive environment, such as offshore wind turbines and port cranes. Compared with carbon steel and alloy steel, stainless steel rotation branches are higher, but their long -term durability and less maintenance costs make it an irreplaceable choice under some special occasions.

4, cast iron

The cast iron rotation support has abrasion resistance and corrosion resistance, and is suitable for the structure of heavy load and slow rotation, such as bridges and buildings. Its price is relatively low, but its strength and toughness are not as good as steel, so it is only applicable to some specific applications.

In short, the selection of materials for rotating support should be determined according to factors such as its application environment, load and rotation speed. When selecting materials, you need to consider the strength, wear resistance and other factors of the material. Different materials affect the performance and life of the bearings. Be careful when choosing

Analysis of the reasons for the phenomenon of the slewing bearing

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During the use of construction machinery equipment, various problems can not be avoided. Sometimes the turntable bearings suddenly break, which will not only affect the production progress, but also cause huge losses, and may also danger. What is the reason why Hengguan Xiaobian will analyze the reasons why the lower turntable bearing broken phenomenon will be analyzed today.

Reasons for the break of the rotor bearing
1. Material problem

The phenomenon of rotor bearing breaks can be said to be a major quality problem of this part. The rotor bearing breaks refer to the inner and outer ring of the inner and outer circles of such bearing, mainly because the tensile strength, yield strength, and impact toughness of the material are not up to the standard. Mechanical properties of making such bearing materials. The main material of the rotor bearing is carbon structure steel. 50mn and 42CRMO are commonly used in this industry. 50mn mechanical performance: (1) tensile strength σb (MPA): ≥645 (66); (2) Lading strength σs (MPA): ≥390 (40); (3) elongation rate Δ5 (%): ≥13: ≥13 ; (4) Sectional contraction 断 (%): ≥40; (5) impacting AKV (J): ≥31; (6) impact tough value αKV (j/cm2): ≥39 (4). When the turntable bearing work at a normal use temperature (-30 ° C to 70 ° C), it can basically be sure of the factors of the material problem.

2. Processing heat treatment

The production and processing process needs to be heat treatment of the rolling roads. The heat treatment fails, resulting in low surface hardness. The hardness layer penetrates into the wall of the rotary bearing structure or reaches the rotary supporting wall, which changes the mechanical performance of the internal and external circles. The value becomes smaller and the material becomes crispy.
Rotor bearing
3. Design structural problem

After the design structure of the turntable bearing is caused by heat treatment, the quenching layer is equivalent to the design thickness of the inner and outer circle. At this time, the material anti -tensile strength and the impact toughness value is small, resulting in a break, but this possibility accounted for a low proportion of the broken accident.

There are many reasons for the phenomenon of rotor bearing. When using an unspoken ring forged, the quality of the bearing material is unqualified. Bearing manufacturers, so that the material and design of the bearing can be guaranteed.