GB/T 20958.2-2007Test conditions for CNC bed-type milling machines - Testing of the accuracy - Part 2: Milling machines with vertical spindle (English PDF)
数控床身铣床检验条件 精度检验 第2部分: 立式铣床
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Issued by
General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of China; Standardization Administration of China
Level / Type
National · Recommended
Issue date
June 25, 2007
Implementation date
November 1, 2007
Scope
GB/T 20958.2-2007 is the English-translated version of 数控床身铣床检验条件 精度检验 第2部分: 立式铣床.
GB/T 20958.2-2007 is the Chinese standard "Test conditions for CNC bed-type milling machines - Testing of the accuracy - Part 2: Milling machines with vertical spindle".
Its scope clause reads: This section provides geometric precision CNC vertical milling machine bed, location accuracy and precision requirements and test methods.
Vertical CNC This section applies to the work surface width 250mm ~ 1250mm general purpose general level of accuracy and precision bed CNC milling and profiling bed milling machine. Its clauses include general requirements.
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Document preview — GB/T 20958.2-2007
National Standard of the People's Republic of China
- ICS
- 25.080.20
- Classification
- J54
Issued by: General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of China; Standardization Administration of China
Contents
- 1 Scope
- 2 Normative references
- 3 General requirements
- 3.1 Units of measurement
- 3.2 Installation Level
- 3.3 Test sequence
- 3.4 Test Item
- 3.5 Test Tool
- 3.6 Working accuracy test
- 3.7 minimum tolerance
- 4 axis named
- 5.1 axis motion
- 5.3 Spindle
- 6 Positioning accuracy test
- 7 Working accuracy test
1 Scope
This section provides geometric precision CNC vertical milling machine bed, location accuracy and precision requirements and test methods.
Vertical CNC This section applies to the work surface width 250mm ~ 1250mm general purpose general level of accuracy and precision bed
CNC milling and profiling bed milling machine.
2 Normative references
The following documents contain provisions which, through reference GB/T 20958 in this section constitute provisions of this section. For dated reference documents
Member, all subsequent amendments (not including errata content) or revisions do not apply to this section, however, encouraged to reach under this section
Parties to research agreement to use the latest versions of these documents. For undated reference documents, the latest versions apply to this section.
GB/T 5342-1985 indexable face mills
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 Units of measurement
This section all linear dimensions are expressed in millimeters; angle deviation is mainly represented by the ratio. In some cases for clarity, but also with a micro
Radians or angular seconds. Its conversion relationship formula below.
0.010/1000 = 10µrad~2 "
3.2 Installation level
This section should be used with reference to GB/T 17421.1-1998, especially empty machine test before installation, spindles and other moving parts
Heating operation, testing methods and tools recommended accuracy.
For cross slide table type milling machines, the moving parts are placed in the middle position of travel, place a level in the center of the table; to stand
Column portable and mobile ram type milling machines, put on a deck along the rail bed, the bridge board perpendicular to the rail bed to put a foot, several level
Instrument separately on the deck Peace feet. Levels in both vertical and horizontal readings should not exceed 0.030/1000.
3.3 Test order
Inspection order under this Part may not represent the actual test sequence. In order to make an inspection tool assembly and disassembly and inspection of convenience, can be arbitrary
Order of inspection.
3.4 Test Project
When the test machine, according to the structural characteristics must not test all of the items in this section.
When the requirements for acceptance testing purposes, the user can obtain the manufacturer agreed to choose some interesting test items, but these test items
Head must be clearly stated at the time of ordering the machine.
......
This preview omits tables, figures, formulas and parts of the technical clauses. The complete document — 10 pages — is available in the English PDF.
Similar standards
Editions of GB/T 20958.2
| Edition | Title | Revision | Status |
|---|---|---|---|
| GB/T 20958.2-2007 | Test conditions for CNC bed-type milling machines - Testing of the accuracy - Part 2: Milling machines with vertical spindle | current edition | Current |
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