1、BRITISH STANDARD BS ISO 3875:2004 Machine tools Test conditions for external cylindrical centreless grinding machines Testing of the accuracy ICS 25.080.50 BS ISO 3875:2004 This British Standard was published under the authority of the Standards Policy and Strategy Committee on 20 January 2004 BSI 2
2、0 January 2004 ISBN 0 580 43296 3 National foreword This British Standard reproduces verbatim ISO 3875:2004 and implements it as the UK national standard. It supersedes BS 4656-24:1993 which is withdrawn. The UK participation in its preparation was entrusted to Technical Committee MTE/1, Machine too
3、ls, which has the responsibility to: A list of organizations represented on this committee can be obtained on request to its secretary. Cross-references The British Standards which implement international publications referred to in this document may be found in the BSI Catalogue under the section e
4、ntitled “International Standards Correspondence Index”, or by using the “Search” facility of the BSI Electronic Catalogue or of British Standards Online. This publication does not purport to include all the necessary provisions of a contract. Users are responsible for its correct application. Compli
5、ance with a British Standard does not of itself confer immunity from legal obligations. aid enquirers to understand the text; present to the responsible international/European committee any enquiries on the interpretation, or proposals for change, and keep the UK interests informed; monitor related
6、international and European developments and promulgate them in the UK. Summary of pages This document comprises a front cover, an inside front cover, the ISO title page, pages ii to iv, pages 1 to 15 and a back cover. The BSI copyright notice displayed in this document indicates when the document wa
7、s last issued. Amendments issued since publication Amd. No. Date Comments Reference number ISO 3875:2004(E)NINRETOITALAN ADNATSDR OSI 3578 Ttide drihino -400251-10 Machine tools Test conditions for external cylindrical centreless grinding machines Testing of the accuracy Conditions dessai des machin
8、es rectifier les surfaces extrieures sans centres Contrle de la prcision Referecne unbmer OSI :5783)E(4002INTERNATIONAL STANDARD ISO 3875 Third edition 2004-01-15 nihcaMot eslo seT t ocidnoitnf sor c lanretxeynilirdlac necg sselertrnidnig ihcamnse eT nitsfo g htcca ecaruy dnoCitisno sedsased i camni
9、hse r cetfirei sel srufcaes xertiruese ssna crtnese C rtnoel dal e rpcsiino BSISO3875:2004 ii BSISO3875:2004 iiiContents Page Foreword iv 1 Scope 1 2 Normative references. 1 3 Terminology and design of axes . 1 4 Preliminary remarks 3 4.1 Measuring units. 3 4.2 Reference to ISO 230-1 and ISO 230-2 3
10、 4.3 Testing sequence 3 4.4 Tests to be performed 3 4.5 Measuring instruments. 3 4.6 Machining tests. 3 4.7 Minimum tolerance. 3 5 Geometric tests. 4 5.1 Grinding wheel dresser 4 5.2 Regulating wheel dresser. 5 5.3 Work support blade location 6 5.4 Grinding wheel spindle. 7 5.5 Regulating wheel spin
11、dle. 8 6 Machining tests. 9 7 Accuracy and repeatability of positioning . 11 7.1 Positioning of manual or automatic (but not numerically controlled) linear axes. 11 7.2 Positioning of numerically controlled linear axes.12 Bibliography . 15 BSISO3875:2004iv Foreword ISO (the International Organizatio
12、n for Standardization) is a worldwide federation of national standards bodies (ISO member bodies). The work of preparing International Standards is normally carried out through ISO technical committees. Each member body interested in a subject for which a technical committee has been established has
13、 the right to be represented on that committee. International organizations, governmental and non-governmental, in liaison with ISO, also take part in the work. ISO collaborates closely with the International Electrotechnical Commission (IEC) on all matters of electrotechnical standardization. Inter
14、national Standards are drafted in accordance with the rules given in the ISO/IEC Directives, Part 2. The main task of technical committees is to prepare International Standards. Draft International Standards adopted by the technical committees are circulated to the member bodies for voting. Publicat
15、ion as an International Standard requires approval by at least 75 % of the member bodies casting a vote. Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights. ISO shall not be held responsible for identifying any or all such patent righ
16、ts. ISO 3875 was prepared by Technical Committee ISO/TC 39, Machine tools, Subcommittee SC 2, Test conditions for metal cutting machine tools. This third edition cancels and replaces the second edition (ISO 3875:1990), which has been technically revised. BSISO3875:2004INTENRATIONAL TSANDADR IS:5783
17、O4002(E)1Machine tools Test conditions for external cylindrical centreless grinding machines Testing of the accuracy 1 Scope The International Standard specifies, with reference to ISO 230-1 and 230-2, geometric tests, machining tests and tests for accuracy and repeatability of positioning axes on g
18、eneral purpose and normal accuracy external cylindrical centreless grinding machines. It also specifies the applicable tolerances corresponding to the above-mentioned tests. This International Standard deals only with the verification of accuracy of the machine. It does not apply to the testing of t
19、he machine operation (vibrations, abnormal noise, stick-slip motion of components, etc.) nor to machine characteristics (such as speeds, feeds, etc.), which should generally be checked before testing of machine accuracy. This International Standard provides the terminology used for the principal com
20、ponents of the machine and the designation of the axes with reference to ISO 841. 2 Normative references The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the
21、referenced document (including any amendments) applies. ISO 230-1:1996, Test code for machine tools Part 1: Geometric accuracy of machines operating under no- load or finishing conditions ISO 230-2:1997, Test code for machine tools Part 2: Determination of accuracy and repeatability of positioning n
22、umerically controlled axes 3 Terminology and design of axes See Figure 1 and Table 1. BSISO3875:20042 Figure 1 Example of a centreless grinding machine Table 1 Terminology Ref. English French German 1 Bed Banc Bett 2 Saddle guideway Guidage de chariot Schlittenfhrung 3 Saddle Chariot Schlitten 4 Reg
23、ulating wheel dresser Dispositif de dressage pour meule dentranement Regelscheibenabrichter 5 Regulating wheelhead Poupe porte-meule dentranement Regelscheibenspindelstock 6 Regulating wheel Meule dentranement Regelscheibe 7 Work support blade Lame support de pice Werkstckauflagensttze 8 Work rest A
24、ppui porte-pice Werkstckauflage 9 Grinding wheel Meule de travail Schleifscheibe 10 Grinding wheelhead Poupe porte-meule de travail Schleifscheibenspindelstock 11 Grinding wheel dresser Dispositif de dressage pour meule de travail Schleifscheibenabrichter 12 Workpiece Pice Werkstck NOTE In addition
25、to the terms used in the two official ISO languages (English and French) this International Standard gives the equivalent terms in German; these terms are published under the responsibility of the member body of Germany (DIN). However, only terms and definitions given in the official languages can b
26、e considered as ISO terms and definitions. BSISO3875:2004 34 Preliminary remarks 4.1 Measuring units In this International Standard, all linear dimensions, deviations and corresponding tolerances are expressed in millimetres; angular dimensions are expressed in degrees, and angular deviations and th
27、e corresponding tolerances are expressed in ratios, but in some cases microradians or arcseconds may be used for clarification purposes. The equivalence of the following expressions should always be kept in mind: 0,010 /1000 10 rad 2“ = 4.2 Reference to ISO 230-1 and ISO 230-2 To apply this Internat
28、ional Standard, reference shall be made to ISO 230-1 and ISO 230-2, especially for the installation of the machine before testing, the warming up of spindles and other moving components, description of measuring methods and recommended accuracy of testing equipment. In the “Observations“ block of th
29、e tests described in Clauses 5 to 7, the instructions are preceded by a reference to the corresponding clause in ISO 230-1 and ISO 230-2 in cases where the test concerned is in compliance with the specifications of ISO 230-1 and ISO 230-2. 4.3 Testing sequence The sequence in which the tests are pre
30、sented in this International Standard in no way defines the practical order of testing. In order to make the mounting of instruments or gauging easier, tests may be performed in any order. 4.4 Tests to be performed When testing a machine, it is not always necessary nor possible to carry out all the
31、tests described in this International Standard. When the tests are required for acceptance purposes, it is up to the user to choose, in agreement with the supplier/manufacturer, those tests relating to the components and/or the properties of the machine which are of interest. These tests are to be c
32、learly stated when ordering a machine. The mere references to this International Standard for the acceptance tests, without specifying the tests to be carried out, and without agreement on the relevant expenses, cannot be considered as binding for any contracting party. 4.5 Measuring instruments The
33、 measuring instruments indicated in the tests described in Clauses 5 to 7 are examples only. Other instruments measuring the same quantities and having at least the same accuracy may be used. Dial gauges shall have a resolution of 0,001 mm. 4.6 Machining tests Machining tests shall be made with fini
34、shing cuts only. Roughing cuts shall be avoided since they are liable to generate appreciable cutting forces. 4.7 Minimum tolerance When establishing the tolerance for a measuring length different from that given in this International Standard (see 2.311 of ISO 230-1:1996), it shall be taken into co
35、nsideration that the minimum value of tolerance is 0,002 mm. BSISO3875:20044 5 Geometric tests 5.1 Grinding wheel dresser Object Checking of the dressing tool movement: G1 a) straightness in the plane of action; b) parallelism to the grinding wheel spindle axis in a plane perpendicular to the plane
36、of action; c) parallelism to the grinding wheel spindle axis U in the plane of action. NOTE Test c) applies only for machines with a fixed dresser and non-adjustable template. Diagram Key 1 copying pin 2 master template Tolerance For a measuring length of 300 a) 0,005 b) 0,10 c) 0,03 Measured deviat
37、ion a) b) c) Measuring instruments Dial gauge, test mandrel and master template Observations and references to ISO 230-1:1996 5.232.1 , 5.233.1 and 5.422.3 The dial gauges shall be mounted on the dressing tool holder with their styli contacting the test mandrel, which is mounted on the grinding whee
38、l spindle, in the plane of action and in a plane perpendicular to the plane of action. The dressing slide shall be moved in W-axis motion at a normal working feed. The measuring length shall be equal to the maximum width of the grinding wheel. If the machine is provided with a copying mechanism, the
39、 copying pin shall be engaged with a normal working pressure (stated by the manufacturer) against the master template. Indicated tolerance relates to the position of the diamond point. The measuring method gives the sum of errors from the dressing mechanism. BSISO3875:2004 55.2 Regulating wheel dres
40、ser Object Checking of the dressing tool movement: G2 a) straightness in the plane of action; b) parallelism to the regulating wheel spindle axis in the plane of action; c) parallelism to the work support plane. NOTE 1 Test b) refers only to machines with a fixed dresser and non-adjustable template.
41、 NOTE 2 Test c) refers only to machines with a non-gradient slide in the vertical plane. Diagram Key 1 copying pin 2 master template 3 alternative type of machine Tolerance For a measuring length of 300 a) 0,005 b) 0,03 c) 0,10 Measured deviation a) b) c) Measuring instruments Dial gauge, test mandr
42、el, master template and test straightedge Observations and references to ISO 230-1:1996 5.232.1, 5.233.1 and 5.422.3 The dial gauges shall be mounted on the dressing tool holder with their styli contacting the test mandrel or straightedge, which is mounted on the regulating wheel spindle, in the pla
43、ne of action and in a plane perpendicular to the plane of action. The dressing slide shall be moved at a normal working feed. The measuring length shall be equal to the maximum width of the regulating wheel. If the machine is provided with a copying mechanism, the copying pin shall be engaged with a
44、 normal working pressure (stated by the manufacturer) against the master template. The indicated tolerance relates to the position of the diamond point. The measuring method gives the sum of errors from the dressing mechanism. BSISO3875:20046 5.3 Work support blade location Object Checking of parall
45、elism of: G3 a) the work support plane to the grinding wheel axis in the vertical plane; b) the vertical datum face to the regulating wheel spindle in the horizontal plane. NOTE Test b) applies only for machines with a fixed work support blade, fixed dresser and non-adjustable template. Diagram Tole
46、rance For a measuring length of 300 a) 0,05 b) 0,03 Measured deviation a) b) Measuring instruments Dial gauge, test mandrel Observations and references to ISO 230-1:1996 5.412.1 and 5.412.4 The dial gauge shall be mounted on the work-support-blade location surfaces, with the stylus contacting the te
47、st mandrel. BSISO3875:2004 75.4 Grinding wheel spindle Object Checking of the grinding wheel spindle: G4 a) run-out (at the wheel mounting diameter/taper); b) periodic axial slip. Diagram Tolerance a) 0,005 for the two locations touched b) 0,008 Measured deviation a) b) Measuring instruments Dial ga
48、uge Observations and references to ISO 230-1:1996 a) 5.612.2 The stylus of the dial gauge shall be set normal to the surface to be checked. The measurement of run-out shall be carried out at both ends of the conical or cylindrical grinding wheel mounting surface. b) 5.622.1 and 5.622.2 The value and
49、 the direction of the axial force F to be applied shall be specified by the supplier/ manufacturer. When preloaded bearings are used, there is no need to apply the force F. BSISO3875:20048 5.5 Regulating wheel spindle Object Checking of the regulating wheel spindle: G5 a) run-out (at the wheel mounting diameter); b) periodic axial slip. Diagram Tolerance a) 0,005 for the two locations touched b) 0,01 Measured deviation a) b) Measuring instrum
