JB/T 51146-1999
Product Quality Grading for Single-row Four-point Contact Ball and Single-row Cross Roller Slewing Bearings (Internal Use)
单排四点接触球式和单排交叉滚柱式回转支承 产品质量分等（内部使用）
Catalogue
前言 → 1 范围 → 2 引用标准 → 3 质量分等原则 → 4 质量指标 → 5 试验方法 → 6 检验规则 Foreword → 1 Scope → 2 Normative References → 3 Quality Grading Principles → 4 Quality Indicators → 5 Test Methods → 6 Inspection Rules
Scope
This standard specifies the quality indicators, test methods, and inspection rules for single-row four-point contact ball and single-row cross roller slewing bearings. This standard applies to the quality grade evaluation and quality supervision management of single-row four-point contact ball slewing bearing products with a raceway center circle diameter of 200~4500 mm and single-row cross roller slewing bearing products with a raceway center circle diameter of 500~4500 mm (hereinafter referred to as slewing bearings). Single-row cross roller slewing bearings with a raceway center circle diameter less than 500 mm and slewing bearings with a raceway center circle diameter greater than 4500 mm may also refer to this standard for implementation.
本标准规定了单排四点接触球式和单排交叉滚柱式回转支承的质量指标、试验方法和检验规则。本标准适用于滚道中心圆直径为200~4500 mm 单排四点接触球式和滚道中心圆直径为500~4500 mm 单排交叉滚柱式回转支承产品（以下简称回转支承）的质量等级评定及质量监督管理。滚道中心圆直径小于500 mm 的单排交叉滚柱式和滚道中心圆直径大于4500 mm 的回转支承也可参照执行。
Normative References
Keywords
Application Summary AI generated
Manufacturers, quality inspection agencies, and users of slewing bearings use this standard to evaluate and classify the quality of single-row four-point contact ball and single-row cross roller slewing bearings. It provides unified test methods and acceptance criteria, ensuring products meet defined quality grades. This standard is important for improving product reliability and service life in construction machinery applications.
该标准主要用于回转支承制造企业、质量监督部门和用户，对单排四点接触球式和单排交叉滚柱式回转支承进行质量等级评定。它帮助各方统一检验方法和判定依据，确保产品达到合格、一等或优等水平。该标准对提升回转支承产品的可靠性和使用寿命具有重要意义。
AI Summary AI generated
This standard specifies quality grading requirements for single-row four-point contact ball and single-row cross roller slewing bearings, including quality indicators, test methods, and inspection rules. Products are classified into three grades: qualified, first-class, and premium, covering aspects such as main component quality, assembly precision, reliability, service life, and user evaluation. Test methods address dimensions, hardness, crack detection, etc., and inspection rules follow GB/T 2828 sampling plans. The standard applies to bearings with raceway center circle diameters from 200 to 4500 mm, aiming to unify quality assessment and improve product performance.
本标准规定了单排四点接触球式和单排交叉滚柱式回转支承的质量分等要求，包括质量指标、试验方法和检验规则。产品按合格品、一等品和优等品三个等级划分，涉及主要零件质量、总成装配精度、可靠性、使用寿命和用户评价等指标。试验方法涵盖尺寸、硬度、裂纹检测等，检验规则采用GB/T 2828抽样方案。标准适用于滚道中心圆直径200~4500mm的产品，旨在统一质量评定依据，提升产品水平。
Key Sentences extracted from text
回转支承按技术性能、质量指标分为合格品、一等品和优等品三个等级。
回转支承的配套件应符合JB/T 2300 的规定。
当成品不带密封圈时，在无负荷情况下给予外力应能灵活、平稳地转动，不得有卡滞和异常噪音等现象。
回转支承随主机作业1000 h，平均无故障工作时间应符合表4 的规定。
本标准采用GB/T 2828 规定的一次正常抽样方案，对于A 类不合格，使用特殊检查水平S–2；对于B 类、C 类不合格，使用一般检查水平Ⅱ。
Slewing bearings are classified into three grades: qualified product, first-class product, and premium product based on technical performance and quality indicators.
The accessories of slewing bearings shall comply with the provisions of JB/T 2300.
When the finished product is without seals, under no-load conditions, it should be able to rotate flexibly and smoothly when external force is applied, without jamming or abnormal noise.
When the slewing bearing operates with the host machine for 1000 h, the mean time between failures shall comply with the provisions of Table 4.
This standard adopts the single normal sampling plan specified in GB/T 2828; for Class A nonconformities, special inspection level S–2 is used; for Class B and Class C nonconformities, general inspection level II is used.
Standard Timeline
Changes from replaced version:
- 将原三项标准合并为一项标准，并按JB/T 2300—1999 对原标准作了修改
- 回转支承的装配精度和寿命比原标准有所提高
- The original three standards were merged into one standard, and modifications were made according to JB/T 2300—1999
- The assembly accuracy and life of slewing bearings have been improved compared to the original standard