GB/T 32325-2015 PDF EnglishUS$115.00 · In stock · Download in 9 seconds
GB/T 32325-2015: Rolling bearings - Specifications for vibration (velocity) of deep groove ball bearings Delivery: 9 seconds. True-PDF full-copy in English & invoice will be downloaded + auto-delivered via email. See step-by-step procedure Status: Valid
Similar standardsGB/T 32325-2015: Rolling bearings - Specifications for vibration (velocity) of deep groove ball bearings---This is an excerpt. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.), auto-downloaded/delivered in 9 seconds, can be purchased online: https://www.ChineseStandard.net/PDF.aspx/GBT32325-2015 NATIONAL STANDARD OF THE PEOPLE’S REPUBLIC OF CHINA ICS 21.100.20 J 11 Rolling bearings - Specifications for vibration (velocity) of deep groove ball bearings Issued on. DECEMBER 31, 2015 Implemented on. APRIL 01, 2016 Issued by. General Administration of Quality Supervision, Inspection and Quarantine; Standardization Administration of the People's Republic of China. Table of ContentsForeword... 3 1 Scope... 4 2 Normative references... 4 3 Terms and definitions... 5 4 Group codes... 5 5 Technical requirements... 5 6 Measurement methods... 6 7 Evaluation methods... 7 8 Inspection rules... 7 Annex A (normative) Measurement methods for radial and axial circular runout of mandrel... 9 Annex B (normative) Measurement method for basic vibration of driving device ... 10ForewordThis Standard was drafted in accordance with the rules given in GB/T 1.1-2009. This Standard was proposed by China Machinery Industry Federation. This Standard shall be under the jurisdiction of National Technical Committee on Rolling Bearings of Standardization Administration of China (SAC/TC 98). The drafting organizations of this Standard. Hangzhou Bearing Test Research Center Co., Ltd., Jinfa Bearing Co., Ltd., National Small and Medium-sized Bearing Product Quality Supervision and Inspection Center, Tianma Bearing Group Co., Ltd., Zhejiang Wuzhou Xinchun Group Co., Ltd., Zhejiang Chentong Bearing Co., Ltd., Zhejiang Times Metrology Technology Co., Ltd. Main drafters of this Standard. Chen Fanghua, Yan Sisi, Li Xianhong, Qian Yaming, Shi Dafang, Shi Zhexi, Zheng Xiaopeng, Chen Jianxin, Kang Pengfei. Rolling bearings - Specifications for vibration (velocity) of deep groove ball bearings1 ScopeThis Standard specifies technical requirements, measurement methods, evaluation methods and inspection rules for vibration (velocity) of deep groove ball bearings of which nominal outer diameter is greater than 10mm ~ 200mm, and the dimensions are in accordance with 0, 2, 3 diameter series of GB/T 276 (hereinafter referred to as the bearings). This Standard is applicable to deep groove ball bearings, in which the specified group V is the basic requirements for general bearing vibration (velocity), groups V1, V2, V3, V4 as well as groups VF3, VF4 are applicable to the bearings that have higher requirements for vibration (velocity) and groups VF3, VF4 are only applicable to the bearings of which the nominal outer diameter is greater than 10mm ~ 100mm.2 Normative referencesThe following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. GB/T 276, Rolling bearings - Deep groove ball bearings - Boundary dimensions GB 443, Lubricating Oils for Total Loss Systems L-AN GB/T 2828.1, Sampling procedures for inspection by attributes - Part 1. Sampling schemes indexed by acceptance quality limit (AQL) for lot-by-lot inspection GB/T 24610.1, Rolling bearings - Measuring methods for vibration - Part 1. Fundamentals3 Terms and definitionsFor the purposes of this document, the terms and definitions defined in GB/T 24610.1 as well as the followings apply. 3.1 peak value of bearing vibration velocity The maximum value of bearing vibration speed within a given time interval.4 Group codesThe codes in JB/T 2974 as well as the following vibration group codes apply to this document.5 Technical requirements5.1 The vibration velocity of individual bearing shall not exceed the corresponding group limit specified in Table 1. 5.2 For groups VF3, VF4 bearings, in addition that the vibration velocity of individual bearing shall not exceed the corresponding group limit specified in Table 1, the crest factor of vibration velocity shall also meet the requirements of group F. When using peak value of vibration velocity, the peak value of low- frequency vibration velocity shall not be greater than 4 times the vibration velocity.6 Measurement methods6.1 Measurement methods shall comply with the provisions of GB/T 24610.2. 6.2 The radial and axial circular runout after mandrel and spindle are combined shall not be greater than 5μm. The measurement methods are in accordance with the provisions of Annex A.7 Evaluation methods7.1 Under the specified measurement conditions, after making the bearing vibration reaches a stable state and run for 1s, start the measurement. The measurement duration is 2s~5s. Read the measurement value in this state corresponding to each measurement point position. 7.2 Select 3 measurement point positions where the outer cylindrical surface of the bearing outer ring is approximately equidistant to measure. Conduct positive and negative measurements. 7.3 When in dispute, use NY-120 solvent oil to effectively clean the non-pre- lubricated bearings.8 Inspection rules8.1 The individual bearing is measured according to the method specified in this Standard. When the vibration velocity value in any frequency band is greater than the corresponding group limit in Table 1, this bearing shall be rejected. 8.2 When conducting the sampling inspection for vibration of a batch of bearings, according to the provisions of GB/T 2828.1, it shall use primary sampling scheme of normal inspection and general inspection level II. The acceptance quality limit (AQL) of vibration velocity shall be 1.5.The AQL of crest factor of vibration velocity or the peak value of vibration velocity shall be 4.0.Annex A(normative) Measurement methods for radial and axial circular runout of mandrel As shown in Figure A.1, after the mandrel and the spindle are combined, place the probe of the measuring meter 1 vertically on any part of the mating surface of the mandrel and the bearing bore and place the probe of the measuring gauge 2 vertically on any part of the shoulder end face of the spindle.Annex B(normative) Measurement method for basic vibration of driving device As shown in Figure B.1, on the support platform of driving device of bearing vibration measurement, place a rigid basic vibration measurement rod (cast iron or steel; the parallelism of its two end surfaces shall not be greater than 0.01mm). Make the sensor probe in contact with the upper end face of the basic vibration measurement rod. The contact force shall be the contact force of sensor during bearing vibration measurement. Start the spindle. Set the range switch of the electronic measurement instrument (if available) to the minimum position. At this time, the indicated value of the low, medium and high frequency bands of the electronic measurement instrument shall be the basic vibration of driving device. ......Source: Above contents are excerpted from the full-copy PDF -- translated/reviewed by: www.ChineseStandard.net / Wayne Zheng et al. Tips & Frequently Asked Questions:Question 1: How long will the true-PDF of English version of GB/T 32325-2015 be delivered?Answer: The full copy PDF of English version of GB/T 32325-2015 can be downloaded in 9 seconds, and it will also be emailed to you in 9 seconds (double mechanisms to ensure the delivery reliably), with PDF-invoice.Question 2: Can I share the purchased PDF of GB/T 32325-2015_English with my colleagues?Answer: Yes. The purchased PDF of GB/T 32325-2015_English will be deemed to be sold to your employer/organization who actually paid for it, including your colleagues and your employer's intranet.Question 3: Does the price include tax/VAT?Answer: Yes. Our tax invoice, downloaded/delivered in 9 seconds, includes all tax/VAT and complies with 100+ countries' tax regulations (tax exempted in 100+ countries) -- See Avoidance of Double Taxation Agreements (DTAs): List of DTAs signed between Singapore and 100+ countriesQuestion 4: Do you accept my currency other than USD?Answer: Yes. www.ChineseStandard.us -- GB/T 32325-2015 -- Click this link and select your country/currency to pay, the exact amount in your currency will be printed on the invoice. Full PDF will also be downloaded/emailed in 9 seconds.How to buy and download a true PDF of English version of GB/T 32325-2015?A step-by-step guide to download PDF of GB/T 32325-2015_EnglishStep 1: Visit website https://www.ChineseStandard.net (Pay in USD), or https://www.ChineseStandard.us (Pay in any currencies such as Euro, KRW, JPY, AUD).Step 2: Search keyword "GB/T 32325-2015". Step 3: Click "Add to Cart". If multiple PDFs are required, repeat steps 2 and 3 to add up to 12 PDFs to cart. Step 4: Select payment option (Via payment agents Stripe or PayPal). Step 5: Customize Tax Invoice -- Fill up your email etc. Step 6: Click "Checkout". Step 7: Make payment by credit card, PayPal, Google Pay etc. After the payment is completed and in 9 seconds, you will receive 2 emails attached with the purchased PDFs and PDF-invoice, respectively. Step 8: Optional -- Go to download PDF. Step 9: Optional -- Click Open/Download PDF to download PDFs and invoice. See screenshots for above steps: Steps 1~3 Steps 4~6 Step 7 Step 8 Step 9 |
