ICS 25. 080. TC
National Standard of the People's Republic of China
GB/T 4020—1997
eqv 1s0 1708:1989
Horizontal lathe
Accuracy testing
Acceplance conditions for general purposeparallel lathes-Testing of the accuracy1997-04-07Promulgated
National Technical Supervision Bureau
1997-10-01Implementation
GB/T4020-1997
This standard is the international standard 1$D17C8:1989 (fourth edition). It is revised to the national standard GB402C·B3 ordinary lathe precision 2 and GB4U21-83 <Precision lathe measures>, and is used for the same effect. The main differences between this standard and IS)17CR are as follows: 1.2 Versions call for the straight line in the water surface. In the notes column of 1S01708, there is a requirement that the deviation of the straightness of the template should be considered as the time (relative to the number of the two center axes) except for the material ball. In the test method column of 2.G711, 3.2.2 is added to the test method column, and the relevant test items are effective immediately. It will be implemented from October 1, 1997. From the date of entry into force, this standard can replace GR402G-R3.GB4021-B3. This standard is proposed by the Ministry of Machinery Industry of the People's Republic of China. This standard is under the jurisdiction of the National Metal Thick Cutting Machine Standardization Technology Association, and the Tongyang Lathe Research Institute is responsible for the production of GB/T4020-1997. ISO Foreword The International Organization for Standardization is a joint group of national standardization organizations (15% of which are international organizations). The formulation of international standards is usually completed by ISO members. Each ISO member has the right to express his or her opinions on the technical requirements of the technical committee. International organizations, organizations or non-official organizations related to ISO may also participate in this work. ISQ and the International Electrical Standards Committee (C) have worked closely together to prepare draft international standards for the transfer of technical committees. All member units should be consulted for their opinions. According to the provisions of ISO chapter I, at least 100% of the members must vote for the international standard. The international standard is adopted as International Standard TS () 1738 is prepared by ISO 1S)/TC 39 Technical Committee for Electrical Machinery. This fourth edition replaces the third edition (15) 1708, 1083) and has minor changes compared with the previous edition. 1 Scope
National Standard of the People's Republic of China
Testing of the accuracy of horizontal lathes
Acceptance conditions for general purpose Parmilel tatheg. Testing of the accuracy GB/34020.1997
eqv151708.1989
f( A020~.40283
This standard [reference 260\General Rules for Precision Inspection of Machine Tools before Cutting] specifies the tolerances of the horizontal lathe and the precision limits of the machine tool.
This standard is only applicable to the precision inspection of machine tools, and is not applicable to the operation changes of machine tools (such as movement, abnormal operation noise, operation of selected parts, etc.) or the parameter inspection of machine tools (speed, feed rate, etc.). These inspections should be carried out before precision inspection. 2 Referenced standards
The provisions contained in the following standards constitute the provisions of this standard by reference in this standard. When this standard was published, the versions shown were all in effect . All standards are subject to revision. All parties using the standards should explore the possibility of using the latest version of the standard. GB192--82 Basic thread profile GR1958-80 Specification for shape and position tolerance measurement JB2670-2 Standard for precision inspection of cutting machine tools 3 Brief description 3.1 All dimensions in this standard are expressed in meters. 3.2 When using this standard, you must refer to JB2570, especially the installation of the machine tool before inspection, the idle operation of the spindle and other moving parts, the measurement methods and the recommended guidance of inspection tools. 3.3 The sequence of several precision inspection items The machine tool parts are arranged according to the order of the machine tool, so it does not represent the actual inspection order. In order to facilitate the inspection of tools and inspections, inspections can be carried out in any order. 3.4 When inspecting a machine tool, it is not always necessary to inspect all items in this standard. The user can also agree with the manufacturer to select individual inspection items of interest. However, these items must be clearly stated when ordering the machine tool. 3.5 For precision inspection, fine turning is used, for example: cutting depth 0.1hm. Feed rate 0.1mm per hour. Rough turning is not used, because high-speed turning can easily generate considerable cutting forces.
3.6 If the actual measured length is different from the value specified in the standard, the length of the machine tool should be marked. The given tolerance value should be converted (see 2-3.1.1 in E2670-82). The minimum conversion value of the tolerance is 3.005 mm for density class and 1.005 mm for compatibility class. 4.1 Dimensional inspection Technical Supervision Commission of the People's Republic of China Approved on April 7, 1997 1001 Implementation GB/T4020 Core Specifications 12+(4) 12*24 → 28-197 009-1009 005 1337000 1
0 1350:003
Wife strong (years old equipment
GB/T 4020
Miε22's (
8 -D292 F
Device when installed
bzxZ.net 0 azole (*
Dns 13x
G X>009
309 1s
003 132>6an 1
00%133X7
Ear (9
GB14020-1997
RI (1
*e1'9s
*When 9
(*29 Week month 6
28022
head matter [8 002
S000(R
GB/T 4020—1997
+$7'+''$2+1+'
nasal wake up 001 day (day
to 00:
r ±
-,10 005
oesT2s:xr
CB/T4070-1997
222p's
224t2*s
pro-evidence
black aos
original lower teacher
urine tip main tip
fu high species
amount.
E PGF
EE\:x State
Reasonable reason
GB/T 4020—
*329 129
i Zhonge2
Lian Dang frame
IGGT home
CD/T 4020
要京xk
GB/T4G20—1991
Some 35 except 1
von * 4 Shadow Army
009 : 32
Tip: This standard content only shows part of the intercepted content of the complete standard. If you need the complete standard, please go to the top to download the complete standard document for free.