Technical FAQ

Question: What is the general task of turning rolling bearing rings?Answer: The main tasks of general turning of rolling bearing rings are: 1. For general forging blanks, remove the hard oxide layer on the surface.2. For bars and tubes, remove excess metal.3. Obtain the shape, size and position accuracy of turning processing.4. Leave a certain depth of allowance evenly on the surface to be processed. 5. Process the auxiliary surfaces (chamfers, grooves, slots, etc.).

Common Materials for Rolling Mill Bearings

Rolling mills are critical equipment in industries such as steel, aluminum, and other metal manufacturing. Bearings in rolling mills play a vital role in ensuring smooth operation under extreme conditions such as high loads, high speeds, and elevated temperatures. The material used in rolling mill bearings is crucial for their performance, durability, and ability to withstand demanding operating conditions. This article explores the common materials used in rolling mill bearings and their specific properties.Common Materials for Rolling Mill Bearings1. High-Carbon Chromium Steel (GCr15 or Equivalent)High-carbon chromium steel, often referred to as GCr15 (equivalent to 52100 in AISI standards), is one of the most commonly used materials for rolling mill bearings. This material offers excellent properties for high-load and high-speed applications.Properties: High hardness after heat treatment, which provides excellent wear resistance. Superior fatigue strength for withstanding repetitive stress cycles. Good dimensional stability under high temperatures. Cost-effective and widely available. Applications: Used in rolling mill applications where moderate heat and wear resistance is sufficient. Suitable for bearings in support rollers, guide rollers, and backup rollers. 2. Case-Hardened SteelCase-hardened steel is another popular material for rolling mill bearings. Unlike through-hardened steel, case-hardened steel has a hard outer surface and a tough, ductile core, making it ideal for applications where impact resistance is essential.Properties: The hard outer layer resists wear, while the soft core absorbs shock and impact. Improved resistance to cracking under heavy loads. Long fatigue life under challenging operating conditions. Applications: Suitable for bearings in heavy-duty rolling mills where high impact loads are common, such as hot rolling mills. 3. Bainitic SteelBainitic steel is a specialized material known for its excellent toughness and wear resistance. It is often used in rolling mill bearings that operate in extreme conditions.Properties: Excellent thermal stability, making it suitable for high-temperature environments. High toughness to resist cracking and deformation under heavy loads. Superior wear resistance compared to standard bearing steels. Applications: Ideal for bearings in hot rolling mills and continuous casting machines where high temperatures and heavy loads are prevalent. 4. Stainless SteelStainless steel is used in rolling mill bearings that require high corrosion resistance due to exposure to water, chemicals, or other corrosive environments.Properties: Excellent corrosion resistance, even in wet or chemically aggressive conditions. Moderate load and wear resistance compared to chromium or bainitic steels. Suitable for environments with high humidity or cooling water exposure. Applications: Bearings in rolling mills used for aluminum or other non-ferrous metals, where cooling water or corrosive environments are common. 5. Special Alloy SteelsCustom alloy steels are often developed for rolling mill bearings to meet specific demands, such as extreme temperature resistance or improved fatigue performance. These materials may include added elements like molybdenum, vanadium, or nickel to enhance particular properties.Properties: Tailored to provide a balance of hardness, toughness, and thermal stability. Enhanced fatigue and wear resistance for demanding applications. Ability to perform well under both high loads and temperatures. Applications: Used in high-performance rolling mills such as tandem mills or heavy plate mills.

GLESI Chief Engineer Li Heng and his team visited ZYS for exchange

On November 19, Li Heng, chief expert of SINOMACH and chief engineer of Guilin Electrical Equipment Scientific Research Institute Co., Ltd., and his team visited the company for research and exchange. Li Wenchao, deputy general manager and chief engineer of ZYS, and Sun Xiaobo, general manager of the manufacturing service division, also participated in the exchange. Li Wenchao introduced the company's development history, scientific research strength, production and operation, and Li Heng spoke highly of the company's achievements in technology research and development and business. The two sides conducted in-depth discussions on key issues such as the test plan, performance requirements, and product schedule of the "wear-resistant slider". Both parties expressed that they will strengthen communication and exchanges in the future to develop new growth points for cooperation and new highlights of the industry in areas such as resin raw materials and insulating materials to achieve win-win cooperation. Li Heng and his party also visited the "wear-resistant slider" production line and expressed full recognition of the processing methods and production processes.