1、BRITISH STANDARD BS 5242-2: 1983 ISO 6537:1982 Tubes for fluid power cylinder barrels Part 2: Specification for non-ferrous metallic tubes with specially finished bores ISO title: Pneumatic fluid power systems Cylinder barrels Requirements for non-ferrous metallic tubes UDC 669.2/.8-462:621.226-222+
2、621.5-222BS5242-2:1983 This British Standard, having been prepared under the directionof the Mechanical Engineering Standards Committee, was published underthe authority of the BoardofBSI and comes into effect on 29July 1983 BSI 10-1999 The following BSI references relate to the work on this standar
3、d: Committee reference MEE/186 Draft for comment 81/77812 DC ISBN 0 580 13351 6 Committees responsible for this British Standard This British Standard was published under the direction of the Mechanical Engineering Standards Committee MEE/-. Its preparation was entrusted to Technical Committee MEE/1
4、86 upon which the following bodies were represented: Association of British Mining Equipment Companies Association of Hydraulic Equipment Manufacturers British Compressed Air Society British Hydromechanics Research Association British Steel Corporation British Telecom Department of Industry (Nationa
5、l Engineering Laboratory) Electricity Supply Industry in England and Wales Engineering Equipment and Materials Users Association Federation of Manufacturers of Construction Equipment and Cranes Health and Safety Executive Institution of Mechanical Engineers Machine Tool Industry Research Association
6、 Ministry of Defence National Coal Board The following bodies were also represented in the drafting of the standard, through subcommittees and panels: British Industrial Truck Association British Steel Industry Hydraulic Press Manufacturers Association Institution of Chemical Engineers Institution o
7、f Production Engineers Welding Manufacturers Association Coopted member Amendments issued since publication Amd. No. Date of issue CommentsBS5242-2:1983 BSI 10-1999 i Contents Page Committees responsible Inside front cover National foreword ii 0 Introduction 1 1 Scope and field of application 1 2 Re
8、ferences 1 3 Definitions 1 4 Symbols 1 5 Manufacture of base tubes 1 6 Pressures 2 7 Temperature 2 8 Tolerances 2 9 Surface finish 3 10 Protection and packing 3 11 Test certification 4 12 Identification statement 4 Annex A Non-ferrous metallic pneumatic cylinder tube dimensions andtolerances 5 Annex
9、 B Method of ordering 6 Figure Permissible deviation from straightness: tubes shorter than 1000 mm 3 Table 1 Mean thickness and eccentricity 2 Table 2 Tolerances for cut-length tubes 2 Table 3 Values of surface finish 4 Table 4 Dimensions and tolerances of aluminium tubes 5 Table 5 Dimensions and to
10、lerances of brass tubes 5 Publications referred to Inside back coverBS5242-2:1983 ii BSI 10-1999 National foreword This Part of this British Standard has been prepared under the direction of the Mechanical Engineering Standards Committee. It is identical with ISO 6537:1982 “Pneumatic fluid power sys
11、tems Cylinder barrels Requirements for non-ferrous metallic tubes”, published by the International Organization for Standardization (ISO). It also reflects the European Oil-hydraulic and Pneumatic Committees (CETOP) Recommended Practice RP79P for non-ferrous pneumatic cylinder tubes (ready to use).
12、It is one of a series of specifications covering the requirements of tubes used in the manufacture of fluid power cylinder barrels. The series comprises the following published Parts: Part 1: Steel tubes with specially finished bores; Part 3: Steel tubes with specially finished surfaces for telescop
13、ic applications for use in the mining industry; Part 4: Specification for steel tubes with specially finished surfaces for general telescopic applications. For the purposes of this Part of this British Standard the identification statement required by clause 12 may be replaced by the following state
14、ment. “Requirements for non-ferrous metallic tubes with specially finished bores comply with BS 5242 “Tubes for fluid power cylinder barrels” Part2:1983“Specification for non-ferrous metallic tubes with specially finished bores”.” Terminology and conventions. The text of the International Standard h
15、as been approved as suitable for publication as a British Standard without deviation. Some terminology and certain conventions are not identical with those used in British Standards; attention is drawn especially to the following. The comma has been used as a decimal marker. In British Standards it
16、is current practice to use a full point on the baseline as the decimal marker. Wherever the words “International Standard” appear, referring to this Part of this standard, they should be read as “this Part of this British Standard”. The Technical Committee has reviewed the provisions of ISO468:1982,
17、 ISO3322:1975 and ISO 5598 1) , to which reference is made in the text, and has decided that they are acceptable for use in conjunction with this standard. The related British Standard to ISO468:1982 is BS 1134 “Method for the assessment of surface texture” Part 1:1972 “Method and instrumentation”.
18、Cross-reference International Standard Corresponding British Standard ISO 286-1 a BS 4500 ISO limits and fits Part 1:1969 General, tolerances and deviations (Technically equivalent) a At present at the stage of draft. 1) At present at the stage of draft.BS5242-2:1983 BSI 10-1999 iii A British Standa
19、rd does not purport to include all the necessary provisions of a contract. Users of British Standards are responsible for their correct application. Compliance with a British Standard does not of itself confer immunity from legal obligations. Summary of pages This document comprises a front cover, a
20、n inside front cover, pagesi to iv, pages1to6, an inside back cover and a back cover. This standard has been updated (see copyright date) and may have had amendments incorporated. This will be indicated in the amendment table on the inside front cover.iv blankBS5242-2:1983 BSI 10-1999 1 0 Introducti
21、on In pneumatic fluid power systems, power is transmitted and controlled through gas under pressure circulating within a circuit. One component of such systems is the fluid power cylinder. This is a device which converts power into linear mechanical force and motion. It consists of a movable element
22、, i.e. a piston rod operating within a cylindrical bore. For the majority of applications, tubing is specified in terms of outside diameter and thickness. For pneumatic fluid power cylinders, however, the important dimensions are bore diameter and thickness (taking account of the pressure rating). T
23、his International Standard covers non-ferrous metallic pneumatic cylinder tubes. 1 Scope and field of application 1.1 This International Standard defines the mechanical properties, dimensional tolerances, surface finishes and technical delivery conditions of the following tubes and bores for pneumat
24、ic fluid power cylinders: round non-ferrous metallic tubes, seamless or welded type, in the as-drawn stress-relieved or fully heat-treated condition; bores, specially finished, with or without metal removal. 1.2 The tubes covered by this International Standard are intended for use as barrels in a wi
25、de variety of pneumatic cylinders. NOTEBrass and aluminium have been considered as a basis in this document but should not be considered the only materials suitable for such applications. 1.3 Annex A specifies the dimensions and tolerances on inside diameters for non-ferrous metallic pneumatic cylin
26、der tubes. 1.4 Annex B provides a recommended method of ordering. 2 References ISO 286-1, ISO systems of limits and fits Part1:General, tolerances and deviations 2) . ISO 468, Surface roughness Parameters, their values and general rules for specifying surfaces. ISO 3322, Fluid power systems and comp
27、onents Cylinders Nominal pressures. ISO 5598, Hydraulic and pneumatic fluid power Vocabulary 3) . 3 Definitions For definitions of terms used, see ISO 5598. 4 Symbols The following symbols are used in this International Standard: 5 Manufacture of base tubes 5.1 Manufacturing process 5.1.1 Use seamle
28、ss base tubes without special finishing, supplied stress-relieved, annealed, or in fully heat-treated condition. 5.1.2 For tubes of welded construction, supply with special finishing. 5.2 Mechanical and chemical properties 5.2.1 At the discretion of the manufacturer, or unless otherwise agreed to at
29、 the time of order, supply the tubes in the heat-treated condition necessary to achieve the mechanical properties. 5.2.2 When brass tubing is used, stress-relieve it after the final drawing operation. 5.2.3 The alloy and metallurgic condition are chosen by the technical departments of the tube manuf
30、acturer and cylinder manufacturer together, to ensure mechanical and chemical properties suited to the conditions of use of the cylinder. 2) At present at the stage of draft. (Revision of ISO/R 286:1962.) 3) At present at the stage of draft. D = nominal outside diameter of the tube d = nominal insid
31、e diameter of the tube a = nominal thickness of the tube R m a = tensile strength at ambient temperature R eL a = lower yield stress (aluminium only) R p(0,2) a = 0,2 % proof stress (this Figure will be used if the yield stress is not clearly indicated) S o a = cross-sectional area of gauge length A
32、 b = elongation after fracture on gauge length = 5,65 R a = arithmetical mean deviation from the mean line of the profile; roughness parameter (see ISO 468) R ma = maximum height of the profile; roughness parameter (see ISO 468) a Symbols for supplier and purchaser reference only. b Elongation on 5,
33、65for tubes with a wall thickness of3mm and thinner, and on 50 mm for tubes with thicker walls (aluminium only). S o S oBS5242-2:1983 2 BSI 10-1999 5.3 Finishing The finishing process required to achieve the bore tolerances and surface finishes covered by this International Standard is subject to ag
34、reement between supplier and purchaser. 6 Pressures 6.1 Limit the normal operating pressure of pneumatic cylinders in general to 25 bar (2 500 kPa) in the standard range, i.e. 6,3 10 16 25 bar (630 1 000 1 600 2 500 kPa) (see ISO 3322). 6.2 Use the permissible pressures as determined by the cylinder
35、 manufacturer in line with the established technology of the trade and applying the safety factors set by the regulations or standards which are in force. 7 Temperature Utilize a working temperature range as determined by the manufacturer, but which is at least within the range of 40 and + 100 C. 8
36、Tolerances 8.1 Ordering Refer to Annex B for the method of ordering. 8.2 Inside diameter 8.2.1 Four classes of tolerances are recognized, H11, H12, H13 and H14, in accordance with ISO 286 (seeAnnex A). 8.2.2 The bore tolerances include all possible deformations of the internal cylinder such as ovali
37、ty, lobing, etc. with the exception of straightness faults. 8.2.3 At the request of the purchaser, special tolerances are subject to agreement between purchaser and supplier if the material is stress-relieved. 8.3 Thickness and eccentricity 8.3.1 The thickness measured at any cross-section along the
38、 tube length shall not vary from the mean thickness as shown in the table below. Table 1 Mean thickness and eccentricity 8.3.2 When the inside and outside diameters are specified, maintain the tolerance on the outside diameter to ensure the minimum and maximum wall thickness as determined in the tab
39、le above, anywhere along the tube. 8.4 Straightness 8.4.1 The measure of straightness is defined in this International Standard as the maximum deviation that can be measured with feeler gauges between the tube and a straight edge of 1 000 mm length resting on the outside surface of the tube and para
40、llel to its axis. 8.4.2 As an alternative to8.4.1, support the tubes by two rollers placed at intervals of 1 000 mm and measure their maximum deviation from the straight while the tubes are being rotated. NOTEApplying this method, the deviation from straightness is half the value of the total indica
41、tor reading (TIR). 8.4.3 For tubes 1 000 mm and longer, measure the deviation over 1 000 mm lengths set at consecutive intervals of 500 mm starting at one end. 8.4.4 For tubes longer than 1 000 mm, ensure that the deviation is not greater than 1/1 000. 8.4.5 Measure tubes up to and including 1 000 m
42、m long over their entire length, and with deviations not exceeding values deduced from Figure. 8.5 Length 8.5.1 When specified on tubes ordered to cut length, apply tolerances that meet the following requirements: Table 2 Tolerances for cut-length tubes 8.5.2 Use random lengths of tube as agreed bet
43、ween purchaser and supplier. Thickness, mm a Tolerances % 0,5 3 NOTEThis table includes the eccentricity between inside and outside diameters. Values in millimetres Length Tolerances over to Brass Aluminium 0 2 000 +3 0 +5 0 2000 5 000 +5 0 +10 0 5 000 +10 0 +12 0 NOTEThese tolerances include the po
44、ssible out of squareness of the ends of the tubes.BS5242-2:1983 BSI 10-1999 3 9 Surface finish 9.1 Bore surface 9.1.1 Specific bore surface finish values with R a andR ma , in accordance with ISO 468. 9.1.2 Use recognized equipment for the measurement of the surface finish. 9.1.3 On a bore surface w
45、ith a longitudinal or no predominant lay, for example cold drawn surfaces, traverse the stylus circumferentially and approximately perpendicular to the tube axis. 9.1.4 On tube surfaces with a predominantly circumferential lay, for example honed or burnished surfaces, obtain measurements by longitud
46、inal traverses. 9.1.5 Take measurements at four positions around the circumference and spaced approximately 90 apart. 9.1.6 Take three measurements at each position, the measuring zones being not less than 6 mm apart and not less than 25 mm from an end of the cylinder tube. 9.1.7 Use the numerical R
47、 arating as the arithmetic mean of all readings taken. NOTENo individual reading is to be more than25% greater than the nominal R avalues. 9.1.8 Use the values of surface finish shown in Table 3 for tubes with drawn or machined surfaces. 9.2 Outside surface Exhibit a mill finish on the outside surfa
48、ce at least equivalent to the method of manufacture of the basic tube (see5.1). 10 Protection and packing The suppliers normal practice for protection and packing shall be adopted, unless the supplier and purchaser have agreed beforehand to special requirements for protection and packing. Figure Per
49、missible deviation from straightness: tubes shorter than 1 000 mmBS5242-2:1983 4 BSI 10-1999 11 Test certification 11.1 The tubes are supplied without test certification unless otherwise agreed at time of inquiry and order. 11.2 If test certification is required, the test procedure and number of tests shall be agreed at the time of inquiry and order. 12 Identification statement (referenceto this International Standard) Use the following statement in test reports, catalogues and sales literature when elec
