JB/T 54255-1999
Product Quality Grading for Measuring Tools and Instruments - Lever Micrometer
量具量仪产品质量分等 杠杆千分尺
Catalogue
前言 → 1 范围 → 2 引用标准 → 3 合格品 → 4 一等品 → 5 优等品 → 6 等级评定 Foreword → 1 Scope → 2 Normative References → 3 Qualified Product → 4 First-Class Product → 5 Premium Product → 6 Grade Evaluation
Scope
This standard specifies the quality indicators for qualified products, first-class products, and premium products of lever micrometers (hereinafter referred to as lever gauges) with a micrometer head graduation value of 0.01 mm and a range of 25 mm, and with an indicator graduation value of 0.001 mm or 0.002 mm and a measuring range up to 100 mm. This standard is applicable to the batch-by-batch inspection and periodic inspection quality grade evaluation of lever gauges produced in batches.
本标准规定了测微头分度值为0.01 mm，量程为25 mm；指示表的分度值为0.001 mm 或0.002 mm，测量范围至100 mm 的杠杆千分尺（以下简称杠杆尺）的合格品、一等品和优等品的各项质量指标。本标准适用于成批生产的杠杆尺逐批检查、周期检查质量等级的评定。
Normative References
Keywords
Application Summary AI generated
This standard is used by manufacturers and quality inspection agencies in the mechanical and metrology industries to evaluate the quality grades of lever micrometers. It defines specific technical indicators for qualified, first-class, and premium products, ensuring that instruments meet varying levels of accuracy, reliability, and durability. This is important for maintaining measurement tool quality, promoting product improvement, and standardizing the market.
这个标准主要用于机械制造和计量检测行业，帮助生产厂家和质检机构对杠杆千分尺进行质量等级评定。通过明确合格品、一等品和优等品的具体技术指标，确保产品在精度、可靠性和耐用性方面达到不同层次的要求。它对于保证量具质量、促进产品质量提升和规范市场具有重要意义。
AI Summary AI generated
This standard JB/T 54255-1999 specifies quality grading requirements for lever micrometers (micrometer head graduation 0.01 mm, indicator graduation 0.001 or 0.002 mm, measuring range up to 100 mm), including qualified, first-class, and premium products. It details specific technical indicators for Class A (critical defects), Class B (major defects), and Class C (minor defects), such as combined error, indication error, measuring force, flatness, and parallelism. Additionally, it covers extra requirements for first-class and premium products, including pitch error, feed error, cleanliness, and life tests. Grade evaluation is conducted according to JB/T 54247.2.
本标准JB/T 54255-1999规定了杠杆千分尺（测微头分度值0.01 mm，指示表分度值0.001或0.002 mm，测量范围至100 mm）的质量分等要求，包括合格品、一等品和优等品。标准详细列出了A类（致命缺陷）、B类（重缺陷）和C类（轻缺陷）不合格项的具体技术指标，如综合误差、示值误差、测力、平面度、平行度等。此外，还涵盖了一等品和优等品的额外要求，如螺距误差、进给误差、清洁度和寿命试验。等级评定依据JB/T 54247.2进行。
Key Sentences extracted from text
本标准规定了测微头分度值为0.01 mm，量程为25 mm；指示表的分度值为0.001 mm 或0.002 mm，测量范围至100 mm 的杠杆千分尺（以下简称杠杆尺）的合格品、一等品和优等品的各项质量指标。
杠杆尺的综合误差应不大于表1 的规定。
杠杆尺指示表的示值误差和示值总误差应不大于表2 的规定。
杠杆尺在锁紧装置松开的状态下，沿测微螺杆轴线方向施加10 N 的压力，指针的变动量应不大于1/2 分度。
杠杆尺的试验条件、要求及合格率见表10 的规定。
This standard specifies the quality indicators for qualified products, first-class products, and premium products of lever micrometers (hereinafter referred to as lever gauges) with a micrometer head graduation value of 0.01 mm and a range of 25 mm, and with an indicator graduation value of 0.001 mm or 0.002 mm and a measuring range up to 100 mm.
The combined error of the lever gauge shall not exceed the provisions of Table 1.
The indication error and total indication error of the lever gauge indicator shall not exceed the provisions of Table 2.
When the lever gauge is in the state with the locking device released, applying a pressure of 10 N along the axis direction of the micrometer screw, the pointer variation shall not exceed 1/2 division.
The test conditions, requirements, and pass rate of the lever gauge are specified in Table 10.
Standard Timeline
Changes from replaced version:
- 本标准与JB/T 54255—94 的技术内容一致，仅按有关规定重新进行了编辑。
- The technical content of this standard is consistent with JB/T 54255-94, only re-edited according to relevant regulations.