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GB/T 21948.1-2008Test conditions for CNC milling machines with table of variable height -- Testing of accuracy -- Part 1: Machines with horizontal spindle (English PDF)

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Issued by

Standardization Administration of China

Level / Type

National · Recommended

Issue date

June 3, 2008

Implementation date

January 1, 2009

Scope

GB/T 21948.1-2008 (Test conditions for CNC milling machines with table of variable height -- Testing of accuracy -- Part 1: Machines with horizontal spindle) is available as an English-translated PDF.

GB/T 21948.1-2008 — This section GB/T 21948 specifies the CNC horizontal milling machine geometric accuracy testing, inspection and positioning accuracy and working accuracy inspection Requirements and methods of test.

This section applies to the work surface width of 200mm ~ 500mm general purpose CNC horizontal milling machine (including CNC universal liters Lower milling machine).

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Document preview — GB/T 21948.1-2008

National Standard of the People's Republic of China

ICS: 25.080.20
Classification: J 54

Issued by: Standardization Administration of China

Introduction
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 Inspection tool
3.6 Working accuracy test
3.7 Minimum tolerance value
3.8 Axis and the direction of movement named
Geometric tests 2
4.1 Axis motion
4.2 Table
4.3 Spindle
4.4 Spindle support
5 Positioning accuracy test
6 18 accuracy test work

Foreword

GB/T 21948 "Test conditions for CNC milling machine accuracy test" is divided into two parts.

--- Part 1. Horizontal milling machine;

--- Part 2. Vertical Milling Machine.

This section GB/T 21948 Part 1.

This part is proposed by China Machinery Industry Federation.

This part of the National Metal Cutting Machine Standardization Technical Committee (SAC/TC22) centralized.

This section is drafted. Zigong Changzheng Machine Tool Co., Ltd., Beijing First Machine Tool Plant.

1 Scope

This section GB/T 21948 specifies the CNC horizontal milling machine geometric accuracy testing, inspection and positioning accuracy and working accuracy inspection Requirements and methods of test.

This section applies to the work surface width of 200mm ~ 500mm general purpose CNC horizontal milling machine (including CNC universal liters Lower milling machine).

2 Normative references

The following documents contain provisions which, through reference GB/T 21948 in this section constitute provisions of this section. For dated references, all subsequent amendments (excluding corrections) or revisions do not apply to this section, however, encourage an agreement under this section Parties to study the latest versions of these documents. For undated reference documents, the latest versions apply to this section.

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) GB/T 19660-2005 Industrial automation systems and integration - Numerical control of machines and motion coordinate system named (ISO 841.

2001, IDT)

3 General requirements

3.1 Units of measurement

This section all linear dimensions are in millimeters (mm) represents; angle deviation is mainly used as a ratio; in some cases for clarity Also used microradians (µrad) or arcsec ( ") indicates its conversion relation formula below.

0.01/1000 = 10 × 10-6 = 10µrad~2 "

3.2 Installation level

When using this section shall GB/T 17421.1-1998, especially air transport machine testing before installation, spindles and other moving parts Turn heat up, measurement and inspection tools recommended accuracy.

According to GB/T 17421.1-1998 adjust the machine to install the 3.1 level. The table in the middle position of travel. Workbench Place the central level meter. Levels in both vertical and horizontal readings are not more than 0.04/1000.

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 testing requirements for acceptance purposes, can Select the manufacturer to obtain the consent of interested test items by the user, but these test items must be clearly stated at the time of ordering the machine.

3.5 Inspection tool

Test tools provided in this section is only an example, you can use the same amount of instructions or have other tools to test at least the same accuracy.

Indicators should have a 0.001mm or higher resolution.

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This preview omits tables, figures, formulas and parts of the technical clauses. The complete document — 17 pages — is available in the English PDF.

Referenced standards

Normative references

GB/T 21948 · ISO 230 · ISO 841

Cited by

JB/T 9928-2019NC knee-type milling machines - Technical requirements

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