Large alloy bearings, also known as bearing shell alloys. Materials used for manufacturing sliding bearings. The microstructure of bearing alloys consists of uniformly distributed hard phase particles on a soft phase matrix, or uniformly distributed soft phase particles on a hard phase matrix. The bearing alloy should have the following properties: good wear resistance and wear reduction performance; Has certain compressive strength and hardness, sufficient fatigue strength and load-bearing capacity; Good plasticity and impact toughness; Has good anti bite properties; Good adaptability; Good embeddedness; It should have good thermal conductivity, corrosion resistance, and a small coefficient of thermal expansion. Used for various types of bearing materials.

The performance of large alloy bearings includes: ① good anti friction performance. The friction coefficient between the bearing shell made of bearing alloy and the shaft should be small, and it should have good lubricity. ② It should have a certain compressive strength and hardness to withstand the pressure applied by the rotating shaft; But the hardness should not be too high to avoid wear on the shaft neck Good plasticity and impact toughness. In order to withstand vibration and impact loads and ensure good fit between the shaft and bearings Good surface performance. It has good anti bite, compliance, and embedding properties Has good thermal conductivity, corrosion resistance, and a small coefficient of thermal expansion.

Definition and Classification

Definition: Large alloy bearings refer to bearings that are large in size and made of alloy materials, used to support and reduce friction of mechanical rotating components, ensuring the smooth operation of mechanical systems

Category:

Classified by alloy type: Common ones include chromium molybdenum alloy steel bearings, which have high strength, high toughness, and good wear resistance, and are suitable for applications that can withstand large loads and impacts; There are also stainless steel alloy bearings, which have good corrosion resistance and are commonly used in equipment with special media environments such as chemical and food processing; In addition, copper alloy bearings, such as tin bronze and aluminum bronze bearings, have good wear resistance, conductivity, and thermal conductivity, making them suitable for equipment that requires conductivity or thermal conductivity

According to the bearing structure, it can be divided into two categories: rolling bearings and sliding bearings. Rolling bearings include large ball bearings, roller bearings, etc. The rolling elements roll between the inner and outer rings, with a low coefficient of friction and the ability to withstand high speeds and loads; Sliding bearings work through the sliding friction between the journal and the bearing shell, and have the characteristics of simple structure, high load-bearing capacity, and strong impact resistance. They are commonly used in low-speed and heavy-duty large machinery

Structural characteristics

Rolling bearings generally consist of an inner ring, an outer ring, rolling elements, and a cage. The inner ring is closely matched with the shaft, and the outer ring is installed inside the bearing seat. The rolling elements roll between the inner and outer rings, and the cage plays a role in separating and fixing the rolling elements, making them evenly distributed and reducing friction and wear

Sliding bearings: usually composed of bearing seats, bearing shells, and lubrication devices. The bearing seat is used to support and fix the bearing shell, which is the part that directly contacts the shaft neck. It is generally made of alloy material and has good wear resistance and anti friction properties. The lubrication device is used to supply lubricating oil between the bearing shell and the journal to reduce friction and wear, ensuring the normal operation of the bearing.

manufacturing process

Melting and Casting: First, select the appropriate alloy material for melting based on the performance requirements of the bearing. During the melting process, the proportion and impurity content of alloy elements are strictly controlled to ensure the quality of the alloy. Then pour the melted alloy liquid into a pre designed mold for casting, to obtain the blank of the bearing. Common casting methods include sand casting, centrifugal casting, etc.

Processing and heat treatment: The cast blank parts need to undergo mechanical processing to achieve the required dimensional accuracy and surface quality. The machining process includes processes such as turning, grinding, drilling, etc. In order to improve the hardness, strength, and wear resistance of bearings, it is also necessary to perform heat treatment on the processed bearings, such as quenching, tempering, and other processes

Surface treatment: In order to further improve the performance and service life of bearings, surface treatment can also be carried out on bearings. For example, using methods such as chemical plating and electroplating to coat the surface of bearings with a layer of metal or alloy coating to improve their corrosion resistance and wear resistance; Alternatively, nitriding treatment can be performed to form a high hardness and wear-resistant nitride layer on the surface of the bearing

Performance characteristics

High load-bearing capacity: Due to the use of high-strength alloy materials and reasonable structural design, large alloy bearings can withstand large radial and axial loads, meeting the operational requirements of large machinery under heavy load conditions.

Good wear resistance: Alloy materials themselves have good wear resistance. After special heat treatment and surface treatment, the wear resistance of bearings is further improved, which can effectively reduce wear during long-term operation and extend service life

Adaptation to harsh environments: Some alloy bearings have good corrosion resistance, high temperature resistance, or low temperature resistance, and can adapt to various harsh working environments, such as humidity, acid-base corrosion, high temperature, low temperature, etc

High reliability: Large alloy bearings have strict manufacturing processes and high quality control requirements, therefore they have high reliability and stability. Under normal usage conditions, it can ensure the long-term stable operation of the mechanical system, reduce failures and downtime.

application area

Power industry: In equipment such as generators and motors, large alloy bearings are used to support the rotor shaft, withstand enormous centrifugal and electromagnetic forces, and ensure the normal power generation and operation of the equipment.

Steel industry: Equipment such as rolling mills and continuous casting machines in steel production require the use of large alloy bearings to withstand heavy loads and impacts, ensuring the efficient and stable operation of the equipment.

Mining industry: Mining machinery such as crushers and mills work in harsh environments with high loads. Large alloy bearings can adapt to these working conditions and provide reliable support and rotation for the equipment.

Shipbuilding industry: Large alloy bearings are required for the propulsion shaft system, rudder system and other parts of ships to withstand various forces during navigation, ensuring the safety and reliability of ship navigation.

Cement industry: Equipment such as rotary kilns and ball mills in cement production require large alloy bearings to support their rotating components, ensuring the normal operation of the equipment and improving production efficiency.