1、DEUTSCHE NORM Julv 1998 Plain bearings (IS0 12302 : 1993) Quality characteristics - Statistical process control (SPC) DIN IS0 12302 ICs 21.1 00.1 o Descriptors: Plain bearings, quality characteristics, SPC. Gleitlager - Qualittsmerkmale - SPC (Statistical process control) (IS0 12302 : 1993) This sta
2、ndard incorporates International Standard IS0 12302 Plain bearings - Quality characteristics - Statistical process control (SPC). National foreword This standard has been prepared by ISO/TC 123. The responsible German body involved in its preparation was the Normenausschu Gleitlager (Rolling Bearing
3、s Standards Committee). DIN IS0 12301 is the standard corresponding to International Standard IS0 12301 referred to in clause 2 of the IS0 Standard. IS0 Standard comprises 3 pages. No pari of this standard may be reproduced without the prior permission of Ref. No. DIN IS0 12302 : 1998-0 English pric
4、e group 06 Sales No. 0406 12.98 Y Deutsches Institut fr Normung e. V., Berlin. wth Verlag GmbH, D-10772 Berlin, has the exclusive right of sale for German Standards (DIN-Normen). Page 1 IS0 12302 : 1993 Plain bearings Quality characteristics - Statistical process control (SPC) Foreword IS0 (the Inte
5、rnational Organization for Standardization) is a worldwide federation of national standards bodies (IS0 member bodies). The work of preparing International Standards is normally carried out through IS0 technical committees. Each member body interested in a subject for which a technical committee has
6、 been established has the right to be represented on that committee. International organizations, governmental and non-governmental, in liaison with ISO, also take part in the work. IS0 collaborates closely with the International Electrotechnical Commission (IEC) on all matters of electrotechnical s
7、tandardization. Draft International Standards adopted by the technical committees are circulated to the member bodies for voting. Publication as an International Standard requires approval by at least 75 % of the member bodies casting a vote. International Standard IS0 12302 was prepared by Technica
8、l Committee ISO/TC 123, Plain bearings, Sub-committee SC 5, Quality analysis and assurance. 1 Scope This International Standard specifies for plain bearings (except thick-walled half-bearings) those quality char- acteristics in accordance with IS0 12301 which can be used to regulate and control a pr
9、oduction process on the basis of statistical process control (SPC). It covers dimensional variables but does not take ac- count of attributes. 2 Normative reference The following standard contains provisions which, through reference in this text, constitute provisions of this International Standard.
10、 At the time of publica- tion, the edition indicated was valid. All standards are subject to revision, and parties to agreements based on this International Standard are encouraged to in- vestigate the possibility of applying the most recent edition of the standard indicated below. Members of IEC an
11、d IS0 maintain registers of currently valid International Standards. IS0 12301 :1992, Plain bearings - Quality control techniques and inspection of geometrical and material quality characteristics. 3 Definitions For the purposes of this International Standard, the following definitions apply. 3.1 qu
12、ality characteristic: Characteristic by means of which the quality of a plain bearing is assessed. 3.2 statistical process control (SPC): Control of quality characteristics of plain bearings during the production process by means of statistical techniques in order to comply with quality requirements
13、. 4 SPCmethods The applied statistical methods used to achieve con- trol of a production process may be different and thus are to be agreed upon between the manufacturer and customer. 5 Selection of SPC quality characteristics Depending on the intended purpose, function, etc. of the plain bearings t
14、o be used, the manufacturer and customer shall select and stipulate the particular characteristics for SPC according to clause 6. NOTE 1 It should be noted that the designated charac- teristics in the matrix of clause 6 have been prepared as a guide. Page 2 IS0 12302 : 1993 6.1 6.1.1 6.1.2 6.2 6 Geo
15、metric quality characteristics The quality characteristics are classified into three groups. Following the order of the specified characteristics in accordance with IS0 12301, these quality character- istics are listed in the form of a matrix as: - preferred with “yes“; - optional with “(yes)“; - un
16、suitable with “no“. Wall thickness Line measurement Point measure- ment (defined) Outside diameter Width I 6.4 Lubricant feed and distribution fea- tures Surface conditions Crush height Free spread Straightness of sliding surface I 1 Back contact pro- portion of surface areal Joint displacement I 8-
17、14 Height of thrust half-washer Lthick- ness) Those quality characteristics which are marked with “(yes)“ and “no“ are accompanied by an explanation in the column “remarks“ in table 1. A horizontal dash (-1 in a column means that this Characteristic is not relevant for the specific type of plain bea
18、ring. Table 1 Remarks a and c to f There is an unlimited number of values on a single measur- ing line ranging between minimum and maximum c Only where it is possible to meas- ure at predetermined points f For closed tolerance requirement, 100 % grading may be requested as an alternative to SPC g Bl
19、anking tool, tool checking by means of initial product acceptance with each order c: Normally determined by wall thick- ness and outside diameter g: Blanking tool, tool checking by means of initial product acceptance with each order a and c to f Not a primary character- istic a and g: Are only locat
20、ing aids a, c to e and g: Not a primary charac- teristic a and c to g: No Gaussian distribution of measured values a: Not a primary characteristic a: Graphical evaluation in most cases a: Not a primary characteristic _ a: Aitribute (qualitative1 charactenstic , c: Will be adjusted when fitting the b
21、ush into the housing bore; attribute characteristic g: Blanking tool; tool checking by means of initial product acceptance with each order Page 3 IS0 12302 : 1993 -+ Flatness 6.16 Flange diameter Distance between flanges Flange thickness Perpendicularity isquareness) of flange 6.20 Geometric devi. a
22、tions - Thin- walled bear- ing half- a - - (yes) ives) bearing I Sintered bush bush -I- Thrus washer iring and hali) g Remsrka g Attribute (qualitative) characteristic a and c to f Not a primary character- istic a and c to f Not a primary character- -I istic - a and c to f: Measuring point shall be
23、defined a and c to f Not a primary character- istic - - d, e and f Not a primary characteristic 7 Material quality characteristics “process-knowledge“. The manufacturer shall decide which parameters are to be checked using statistical Control of the material manufacturing processes de- techniques in accordance with customer require- pends on a large number of parameters which involve ments.
