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GB/T 20958.2-2007 English PDF

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GB/T 20958.2-2007: Test conditions for CNC bed-type milling machines -- Testing of the accuracy -- Part 2: Milling machines with vertical spindle
Status: Valid
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GB/T 20958.2-2007English599 Add to Cart 4 days [Need to translate] Test conditions for CNC bed-type milling machines -- Testing of the accuracy -- Part 2: Milling machines with vertical spindle Valid GB/T 20958.2-2007

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Basic data

Standard ID GB/T 20958.2-2007 (GB/T20958.2-2007)
Description (Translated English) Test conditions for CNC bed-type milling machines -- Testing of the accuracy -- Part 2: Milling machines with vertical spindle
Sector / Industry National Standard (Recommended)
Classification of Chinese Standard J54
Classification of International Standard 25.080.20
Word Count Estimation 23,211
Date of Issue 2007-06-25
Date of Implementation 2007-11-01
Adopted Standard ISO 1984-2-2001, NEQ; ISO 10791-4-1998, NEQ; ISO 10791-7-1998, NEQ
Regulation (derived from) National Standard Announcement 2007 No.6 (Total No.106) (National-Standard-Commission)
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 the vertical CNC bed milling geometric accuracy, positioning accuracy and precision requirements and test methods. This section applies to vertical CNC working table width 250 mm ~ 1250 mm general purpose general level and precision accuracy profiling bed milling machines and CNC bed milling machine.

GB/T 20958.2-2007: Test conditions for CNC bed-type milling machines -- Testing of the accuracy -- Part 2: Milling machines with vertical spindle


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Test conditions for CNC bed-type milling machines Testing of the accuracy Part 2. Milling machines with vertical spindle ICS 25.080.20 J54 National Standards of People's Republic of China Test conditions for CNC bed milling machine accuracy test Part 2. Vertical Milling Machine Posted 2007-06-25 2007-11-01 implementation Administration of Quality Supervision, Inspection and Quarantine of People's Republic of China Standardization Administration of China released

Table of Contents

Preface Ⅰ 1 Scope 1 2 Normative references 1 3 General requirements 1 3.1 Units of measurement 1 3.2 Installation Level 1 3.3 Test sequence 1 3.4 Test Item 1 3.5 Test Tool 2 3.6 Working accuracy test 2 3.7 minimum tolerance 2 4 axis named 2 Geometric tests 3 5 5.1 axis motion 3 Workbench 5.2 6 11 5.3 Spindle 14 6 Positioning accuracy test 7 Working accuracy test 16

Foreword

GB/T 20958 "Test conditions for CNC bed milling machine accuracy test" is divided into two parts. --- Part 1. Horizontal milling machine; --- Part 2. Vertical Milling Machine. This section GB/T 20958 Part 2. Settings This section geometric precision test items equivalent to ISO 1984-2. "Part 2 Test conditions for precision milling machine test 2001 Score. vertical milling machine "in its tolerance value on the basis of compression (1.25 to 1.6); positioning accuracy and test accuracy test, respectively reference work ISO 10791-4.1998 "Test conditions for machining centers - Part 4. positioning accuracy and linear and rotary axes repeatability test" And ISO 10791-7.1998 "Test conditions for machining centers - Part 7. Finishing accuracy test specimen" to develop. Test items in this section of the precision of tolerance values in the general level on the basis of the compression (about 1.6). Since the implementation of this part of JB/T 8329.1-1999 "CNC bed milling machine precision testing" section and in vertical milling machine JB/T 8599.1-1997 "CNC profiling bed milling machine precision testing" abolished. 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. The main drafters of this section. Wang Xiaohui, Hu Ruilin, Xu Bank of China. This section first formulated. Test conditions for CNC bed milling machine accuracy test Part 2. Vertical Milling Machine

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.

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