1、UDC 62-408 : 621-2 : 681-2 : 001.4 DEUTSCHE NORM June 1982 Surfaces of components used in mechanical engineering and light engineering Terminology according to stress conditions DIN 4764 Oberflchen an Teilen fr Maschinenbau und Feinwerktechnik; Begriffe nach der Beanspruchung Supersedes June 1965 ed
2、ition This standard deals with the terminology related to the surfaces of components used in mechanical engineering and in light engineering, from the aspect of the stresses and strains which arise most frequently. Standardized concepts have been introduced for the surfaces in accordance with the na
3、ture of the stressing to which they are exposed, in order to facilitate mutual understanding. The components used in mechanical engineering and in light engineering are subjected to widely varying kinds of stresses in practice. As a general rule, they interrelate with other solid, liquid or gaseous
4、bodies. This interplay of body and counterbody is governed not only by the material properties, but to a very large extent also by the geometrical characteristics of the surfaces concerned. The surfaces of the counterbody which interrelate with stressed surfaces are called counter-surfaces. In order
5、 to ensure the best possible behaviour in service of a technical body, the surface must be properly adapted to the stress. In many cases the surface of a body is exposed simultaneously to several kinds of stress. The possible combinations are so varied and numerous that they cannot be enumerated in
6、this standard. 1 Surfaces not stressed mechanically, or only marginally stressed l) Concepts Definition I Term 1.1 Exposed facel) Surface which has chiefly only to satisfy requirements deter- mined by aesthetic or physio- logical considerations 1.1.1 1.1.2 Visible facel) Inverted facer) Exposed face
7、 which is visible to the observer in the normal work- ing position Exposed face which is not visible to the observer in the normal working position 1.2 Base surface for coatings Surface which acts as support for coatings and platings 1.3 1.4 Checking face (measuring face) Electric contact face Surfa
8、ce in contact with a counter- surface for the purpose of check- ing or setting a given position Surface which closes an electric circuit on contact with a counter- surface 1) A counter-surface either does not exist or is not required Examples of application Claddings and external surfaces of housing
9、s Undersides and internal surfaces of housings Surfaces of components which are coated (e.g. varnished or electroplated) Inspection instruments, measur- ing tools, gauges Electric switches and connectors I Beuth Verlag GmbH. Berlin 30. has exclusive sale rights for German Standards (DIN-Normen) 08.8
10、3 DIN 4764 Engl. Price group Sales No. 0105 Page 2 DIN 4764 2 Surfaces subjected to stresses, in most cases without any relative motion vis-vis the counter-surface Concepts Definition Exa m p les of application No. Term 2.1 Stress boundary surface Surface on statically or dynami- cally stressed bodi
11、es (the surface is not subjected to stress from o ut s i d e) Springs, torsion bars, bolts, rivets, clamping surfaces subjected to bending or torsional stress 2.2 Gripping surface Surface designed for the non-slip gripping of control elements Knurled grips, tool handles 2.3 Joint face Surface in sta
12、tic contact with a counter-surface after jointing 2.3.1 Adhering surface Microfinished joint face which adheres to counter-surfaces of equal finish Joint face for the contact or sup- port of a technical body against or on a counter-surface Block gauges 2.3.2 Contact surface Bearing surface Base of a
13、 trestle, flanges, fixed support of a bridge, brackets 2.3.3 Sealing face (static) Joint face which seals off gases, vapours or liquids leaktight Flanges, valves 2.3.4 Aligning surface Joint face which fixes a counter- body in space Surface plates and flat face plates, mounting prisms, wedges, holdi
14、ng device Clearance fits, threaded setting gauges 2.3.5 Clearance fit surface Joint face which achieves a given clearance fit when a part is joined to a counterpart 2.3.6 Joint face which achieves a given interference fit Wedges, cylindrical and tapered interference fits, taper pins, serra- tions In
15、terference fit surface (previously termed force fit surface) Bonding surface Welded and soldered joints, glued and puttied joints, platings 2.4 Surface destined to be firmly joined to a counter-surface 2.5 Impact surface Surface subjected to dynamic effects through impact Valve tappets, striking pin
16、s, type- writer characters, buffers, hammers DIN 4764 Page 3 3 Surfaces subjected to friction, with relative motion vis-vis the counter-surface Examples of application Concepts Definition Surface which slides on a counter- surface No. 3.1 3.1.1 3.1.2 3.1.3 3.1.4 3.1.5 3.2 3.3 3.4 3.5 Term Sliding su
17、rface Dry sliding surface Sliding surface which slides on the counter-surface under a given amount of contact pressure, with- out lubricant Slide bars, plain bearings of synthetic material Lubricated sliding surface Sliding surface which slides on the counter-surface under a given amount of contact
18、pressure, using a lubricant Pia in bear i ngs, shaft jour na Is, sI ide bars, drawing dies Grinding surface Texturally heterogeneous sliding surface with chip removing action Grinding wheels, honing stones, lapping strips for castings Turning tools, milling cutters, knives, scrapers Cutter surface G
19、eometrically defined sliding sur- face used for machining with chip removal, always in conjunction with another surface with which it forms an enclosing angle Sealing face (moving) Sliding surface which seals off gases, vapours or liquids leak- tight Guides, shafts, discs Tooth profiles, rolls, roll
20、ing bear- ings, raceways Surface which moves on rolling contact over a counter-surface, during which both rolling and sliding occur Rolling face Smoothing surface Surface designed to generate a counter-surface by plastic deform- ation of the shape of the surface Spinning tools, planishing rolls Flow
21、 surface Pipelines, components of pumps and turbines Surface for the conduction of liquids or gases Surface which touches a counter- surface with an adjustable contact pressure in order to reduce a relative speed Brake discs, brake drums Braking surface, clutch surface Page 4 DIN 4764 Other relevant
22、 standards DIN 4760 Form deviations; concepts, classification system DIN 4761 Surface character; geometrical characteristics of surface texture, concepts, symbols DIN 4766 Part 1 Surface roughness associated with types of manufacturing methods; attainable arithmetical mean value of peak-to-valley he
23、ight R, according to DIN 4768 Part 1 DIN 4766 Part 2 Surface roughness associated with types of manufacturing methods; attainable arithmetical mean value Ra according to DIN 4768 Part 1 DIN 4768 Part 1 Determination of surface roughness values Ra, R, R, with electric stylus instruments; basic data A
24、mendments The following amendments have been made compared with the June 1965 edition: a) Since this terminology standard classifies according to stress and not function, the title and the columns of the tables b) The table has been supplemented by additional examples of application. c) The followin
25、g surfaces have been additionally incorporated in the standard: have been altered accordingly. - checking face - electric contact face - clutch surface - braking surface d) The nomenclature of the following surfaces has been changed: - support surface changed to contact surface, bearing surface - force fit surface changed to interference fit surface International Patent Classification G O1 N 13/00
