GB/T 21947-2008Numerically milling machines for special screws - Testing of the accuracy (English PDF)
数控异型螺杆铣床 精度检验
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Issued by
SAMR; SAC
Level / Type
National · Recommended
Issue date
June 3, 2008
Implementation date
January 1, 2009
Scope
GB/T 21947-2008 is the English-translated version of 数控异型螺杆铣床 精度检验.
GB/T 21947-2008 is the Chinese standard "Numerically milling machines for special screws - Testing of the accuracy". Its scope clause reads: 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. Its clauses include general requirements.
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Document preview — GB/T 21947-2008
National Standard of the People's Republic of China
- ICS
- 25.040.20
- Classification
- J 56
Issued by: State Administration for Market Regulation; Standardization Administration of the PRC
Contents
- Foreword
- 1 Scope
- 2 Normative references
- 3 Terms and definitions
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.
GB/T 38193-2019 | JB/T 8490-2008 | GB 16454-2008 | GB/T 21946-2008 | GB/T 21945-2008 | […]
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This preview omits tables, figures, formulas and parts of the technical clauses. The complete document — 15 pages — is available in the English PDF.
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