GB/T 21947-2008 English PDF

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GB/T 21947-2008: Numerically milling machines for special screws -- Testing of the accuracy
Status: Valid

Standard ID	USD	BUY PDF	Lead-Days	Standard Title (Description)	Status
GB/T 21947-2008	349	Add to Cart	3 days	Numerically milling machines for special screws -- Testing of the accuracy	Valid

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Basic data

Standard ID: GB/T 21947-2008 (GB/T21947-2008)
Description (Translated English): Numerically milling machines for special screws -- Testing of the accuracy
Sector / Industry: National Standard (Recommended)
Classification of Chinese Standard: J56
Classification of International Standard: 25.040.20
Word Count Estimation: 15,152
Date of Issue: 2008-06-03
Date of Implementation: 2009-01-01
Quoted Standard: GB/T 17421.1-1998; GB/T 17421.2-2000
Regulation (derived from): National Standard Approval Announcement 2008 No.9 (Total No.122)
Issuing agency(ies): General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of China, Standardization Administration of the People's Republic of China
Summary: This standard specifies requirements and methods of CNC milling machine shaped screw (hereinafter referred to as "Machine ") the geometric accuracy and precision testing. This standard applies to the largest CNC milling shaped screw diameter of 400mm milling.

GB/T 21947-2008: Numerically milling machines for special screws -- Testing of the accuracy

---This is a DRAFT version for illustration, not a final translation. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.) will be manually/carefully translated upon your order.
Numerically milling machines for special screws. Testing of the accuracy ICS 25.040.20 J56 National Standards of People's Republic of China Precision CNC milling machine screw shaped test Posted 2008-06-03 2009-01-01 implementation Administration of Quality Supervision, Inspection and Quarantine of People's Republic of China Standardization Administration of China released

Foreword

The standard proposed by China Machinery Industry Federation. The standard metal cutting machine tools by the National Standardization Technical Committee (SAC/TC22) centralized. This standard was drafted. Qinghai second machine tool manufacturers limited liability company. The main drafters of this standard. Guo Lin, Gao Jun, Zhang Zhenhao, Yan Fang.

Introduction

The standards not only in the country unified class precision machine tools and inspection standard for CNC milling machine screw shaped into Accuracy test products provide the technical basis for acceptance and delivery, but also to promote the upgrading and technological progress shaped screw milling products and promote trade products And economic development, and help to stabilize and improve the quality of these products to enhance the market competitiveness of products. Precision CNC milling machine screw shaped test

1 Scope

This standard specifies requirements and methods shaped screw CNC milling machine (hereinafter referred to as "Machine") geometric accuracy and precision testing. This standard applies to the maximum diameter of milling CNC milling machine shaped screw of 400mm.

2 Normative references

The following documents contain provisions which, through reference in this standard and become the standard terms. For dated references, subsequent Amendments (not including errata content) or revisions do not apply to this standard, however, encourage the parties to the agreement are based on research Whether the latest versions of these documents. For undated reference documents, the latest versions apply to this standard. GB/T 17421.1-1998 Test code for machine tools - Part 1. under no-load or finishing conditions Geometric accuracy of machines (Eqv ISO 230-1.1996) GB/T 17421.2-2000 Test code for machine tools - Part 2. CNC axis positioning accuracy and repeatability of determination (Eqv ISO 230-2.1997)

3 General requirements

3.1 of this standard shall GB/T 17421.1-1998 and GB/T 17421.2-2000. 3.2 according to GB/T 17421.1-1998 installation level adjustment in 3.1, the slide plate in the middle of the rail, machine tool guide ends (or pass Through special deck) placed level meter, a level parallel to the rail bed and two directions perpendicular to the rail bed reading should not exceed 0.04/1000. Geometric test sequence 3.3 project is in accordance with the arrangement of machine components, it does not indicate the actual test sequence. Inspection, can be generally installed Split testing tools and testing convenient, requirements for thermal seized items arranged the actual inspection order. 3.4 inspection tools, according to the structural characteristics must not test all of the items in this section. For the purpose of acceptance testing requirements, the Users can obtain the manufacturer agreed to choose some interesting test items, but these items must be clearly stated in the test machine when ordering. 3.5 working accuracy test, test specimens shall be carried out after finishing. 3.6 when the measured length of this standard is not the same length, tolerances should be GB/T 17421.1-1998 energy in accordance with the provisions of 2.3.1.1 Enough length measurement conversion, when the conversion result is less than 0.005mm, 0.005mm based upon the count. ......

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