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इंटरनेट मानक Disclosure to Promote the Right To Information Whereas the Parliament of India has set out to provide a practical regime of right to information for citizens to secure access to information under the control of public authorities, in order to promote transparency and accountability in the working of every public authority, and whereas the attached publication of the Bureau of Indian Standards is of particular interest to the public, particularly disadvantaged communities and those engaged in the pursuit of education and knowledge, the attached public safety standard is made available to promote the timely dissemination of this information in an accurate manner to the public. “जान1 का अ+धकार, जी1 का अ+धकार” “प0रा1 को छोड न’ 5 तरफ” Mazdoor Kisan Shakti Sangathan Jawaharlal Nehru “The Right to Information, The Right to Live” “Step Out From the Old to the New” IS 15332 (2003): Pneumatic Cylinders for Mechanized Multiple Spot Welding [PGD 16: Fluid Power] “!ान $ एक न’ भारत का +नम-ण” Satyanarayan Gangaram Pitroda ““IInnvveenntt aa NNeeww IInnddiiaa UUssiinngg KKnnoowwlleeddggee”” “!ान एक ऐसा खजाना > जो कभी च0राया नहB जा सकता हहहहै””ै” Bhartṛhari—Nītiśatakam “Knowledge is such a treasure which cannot be stolen” IS 15332:2003 1S07285:1995 Indian Standard PNEUMATIC CYLINDERS FOR MECHANIZED MULTIPLE SPOT WELDING ICS25.160.30 @BIS 2003 BUREAU OF INDIAN STANDARDS MANAK BHAVAN, 9 BAHADUR SHAH ZAFAR MARG NEW DELHI 110002 April 2003 PriceGroup 10 Pneumatic Fluid Power Systems Sectional Committee, BP 16 NATIONAL FOREWORD This Indian Standard which is identical with ISO 7285 :,1995 ‘Pneumatic cylinders for mechanized multiple spot welding’ issued by the International Organization for Standardization ( ISO ) was adopted by the Bureau of Indian Standards on the recommendation of the Pneumatic Fluid Power Systems Sectional Committee and approval of the Basic and Production Engineering Di;ision Council. The text of the ISO Standard has been approved as suitable for publication as Indian Standard without deviations. Certain conventions are, however, not identical to those used in Indian Standards. Attention is particularly drawn to the following: a) Wherever the words ‘International Standard’ appear referring to this standard, they should be -read as ‘Indian Standard’. b) Comma ( , ) has been used as a decimal marker in the International Standard while in Indian Standards, ‘the current practice is to use a point ( .) as the decimal marker. The Technical Committee responsible for the preparation of this standard has reviewed the provisions of the following ISO Standard and has decided that the same is acceptable for use in conjunction with this standard: ISO 4394-1:1980 Fluid power systems and components — Cylinder barrels — Part 1 : Requirements for steel tubes with specially finished bores For the purpose of deciding whethera particular requirement of this standard is complied with, the final value, observed or calculated, expressing the result of a test or analysis, shall be rounded off in accordance with IS 2 : 1960 ‘Rules for rounding off numerical values ( revised )’. The number of significant places retained in the rounded-off value should be the same as that of the specified value in this standard. IS 15332:2003 ISO 7285:1995 Indian Standard PNEUMATIC CYLINDERS FOR MECHANIZED MULTIPLE SPOT WELDING 1 Scope 25—31,5—40—50—63—80—100 —125 — 160 This International Standard specifies the requirements of the geometrical and mechanical characteristics of 3:2 Nominalforces pneumatic cylinders used for multiple spot welding machines and their manufacturing, delive~ and test The nominal forces standardized, in kilonewtons, for specifications. a pressure of 1 MPa (10 bar) are These cylinders for a nominal air pressure of 1 MPa 2,19 — 2,86 — 3,61 —4,61 — 5,92 — 7,60 — 9,74 (1Obar) are double-acting, with two piston stages in series for the advance during the operational stroke and the force, and a single piston stage for the return. 4 Fixingthe cylinder The cylinder is mounted on the machine by one of the 2 Normative reference methods A to H described in annex A. The following standard contains provisions which, through reference in this text, constitute provisions 5 Dimensions of this International Standard. At the time of publication, the edition indicated was va lid. All standards are subject to revision, and parties t o agreements 5.1 Outsidedimensions based on this International Standard are encouraged to investigate the possibility of applying the most re- Depending on the method of mounting the cylinder, cent edition of the standard indicated below. Mem- the nominal force and the nominal stroke, the cylin- bers of IEC and ISO maintain registers of currently ders shall have the dimensions indicated in the valid International Standards. drawings in annex C taking into account the characteristics of the electrode holder attachment indicated ISO 4394-1:1980, F/uid power systerns and compon- in annex B. ents — Cylinder barrels — Part 1: Requirements for The nominal values of the maximum outside dimen- steel tubes with specially finished bores. sions, in millimetres, are 46—51—56—63—71—80—90 3 Nominal characteristics The cylinders covered by this International Standard 5.2 Bore diameter are characterized by their nominal stroke, their nominal force and their outside dimensions. The recommended dimensions, in millimetres, are 40 — 45—50—56—63—71—80 3.1 Nominal strokes Tolerances shall be in accordance with ISO 4394-1 The nominal strokes standardized, in millimetres, are — H12. IS 15332:2003 ISO 7285:1995 6 Operating specifications 7.6 Leakage The bodies of the cylinders shall not leak in normal 6.1 Nominal force conditions of use (to check this, see 10.5). The nominal force shall be given at a Pressure of 1 MPa (10 bar) with a toleran;e of * 5 ‘Yo. 7.7 Behavlour under pressure 6.2 Returnforce The body of the cylinder shall be able to withstand The return force shall not be less than 40 YO of the without being damaged a test pressure equal to two nominal force. times the maximum supply pressure applied for 1 min in each direction (see 10.4). 6.3 Maximum supply pressure The maximum supply pressure is 1,6 MPa (16 bar). 7.8 Electrodeholder attachment 7 Construction The electrode holder attachment shall be completely electrically insulated with respect to the body of the 7.1 Point of application of the reaction cylinder (to check this, see 10.3). This subclause does not apply to electrode holder attachments according The cylinders shall function correctly when the re- to Nos. 13 and 22. action to the nominal force is being applied at a maximum distance of 28 mm from the axis of thrust. 7.2 Piston rod 7.9 Endurance The sliding bearing surfaces of the rod shall have an The cylinders shall be able to withstand the endurance adequate hardness to avoid friction, wear, oxidization test described in 10.8 according to the requirements and any scale caused by sputtering (sparks). of 10.8.5 and 10.8.6. 7.3 Rotation The piston rod assembly is considered as non- rotating. The anti-rotating device shall withstand, 7.~0 Finish without being damaged, a rotary torque of 150 N.m -applied in either direction and at any point of the travel The outer surfaces shall be protected against cor- of the piston rod. rosion. 7.4 Seals The seals shall be compatible with fluids used to lu- bricate the cylinder. 8 Marking 7.5 Perpendicularity— Parallelismbetween the mounting point and the attachment Any faults in perpendicularity or parallelism of the 8.1 Identificationof the cylinders bearing surface of the body of the cylinder with respect to the axis of the shank cone of the electrode The cylinders are identified by an alphanumeric sym- holder shall not exceed 0,2 ‘Yo (for inspection, see bol, the different numbers or letters of which are 10.2). separated by a dash and arranged as follows: 2 IS 15332:2003 ISO 7285:1995 — apparatus operating with a pneumatic fluid: letter P — two-stage cylinder: number 2 - xxx” - — double-action cylinder: letter D IP-2-D-A-2,19-u-ox-11- I — method of mounting: letter A to H in accordance with an- 11S07285 I nex A — nominal force: indicate the number from 3.2 1)Name of the manufacturer. — dimensions of the body or width of the cyl- Figure1 — Exampleofaratingplate inder defining the overall dimensions of the cylinder: number giving di- mension Eof an- 9 Delivery conditions nex C — nominal stroke: number consisting The cylinders shall be supplied of three figures giving the nominal _ in good working order; stroke — electrode holder at- — protected so that even after prolonged storage at tachment: number consisting the user’s premises in the original packing, all the of two figures parts likely to deteriorate (rods, seals, internal sur- symbolizing the at- faces, cones, openings, etc.) retain the qualities tachment in ac- required by ISO 7285; cordance with annex B — with the openings stopped up; — in packing the outside of which is marked with the Examp/es: identifica~on specified in clause 8. P—2—D—A—2,19—46—025— 11 P—2— D—C—4,61—63—1OO—22 10 Inspectionand type tests 10.1 Visual inspection 8.2 Rating pIate Conformity to the specifications of 7.10 and clauses 8 and 9 is checked by visual inspection. Seefigure 1. The cylinders shall have the following information on 10.2 Dimensional inspection a rating plate or stamped directly on the body of the cylinder: Dimensional inspection includes — name of the manufacturer; — verification of conformity with the drawings; — alphanumeric identification symbol in accordance — inspection of the shank cone of the electrode with 8.1; holder by means of a standard gauge, which should show a minimum of 2/3 blue, with a bias — reference to ISO 7285. towards the base diameter; These indications shall be permanent and shall not be — checking of the perpendicularity or parallelism (see affected by any industrial chemical in common use. 7.5). 3 IS 15332:2003 ISO 7285:1995 10.3 Inspectionof the electricalinsulation 10.8 Endurancetype test of the electrodeholder attachment A voltage of 48 V d.c. is applied between the attach- For the purpose of this endurance type test, cylinders ment and the mounting. The resistance shall not be of nominal force of 2,86 kN and 4,61 kN and of less than 1 MQ. 50 mm stroke serve as reference. 10.4 Pressuretype test Conformity with the specifications of 7.7 is checked by applying a liquid (water) pressure of 3,2 MPa 10.8.1 Testset-up (32 bar) at the inlet or outlet of the cylinder for 1 min in each direction. After drying, the cylinder is sub- jected to the test described in 10.5. Cables shall not be restricted. 10.5 Leaktype test — Electrodes offset by: 28 mm. The cylinder supplied with air is immersed in water. — Centre to centre spacing of the cvlinders (d) and The test is carried out at two different air pressures, gaps as a function of tie force (see table 1 and 0,2 MPa (2 bar) and 1,0 MPa (10 bar), which shall be figure 2). kept constant for 1 min and in the forward and return position. No air bubbles shall appear when a new cyi- inder is tested. Table1 10.6 Separation forcetype test Centreto centrespacing Force (d) The supplied pressure of the cylinder shall increase kN mm progressively from OMPa (Obar) to 0,1 MPa (1 bar). The movement of the piston shall commence before 2,19 53 0,1 MPa (1 bar) and shall continue smoothly without 2,86 60 jolts. Before the test, carry out five forward and return 3,61 67 4,61 75 cycles. 5,92 85 7,60 95 10.7 Nominal forcetype test 9,74 106 The measuring device shall be accurate to + 1,5 ‘%.. IS 15332:2003 ISO 7285:1995 Dimensions in rnillimetres W--i 1’ II I I II I.1l.J l! Lkj3- o Cables shall not be restricted 1 I 28 * Figure2 — Testset-up Total cycle =3s t- J Phase I Phase II Phase Ill Phase IV Downstroke Welding Upstroke Waiting 0,8 S m1- 0,4s I 0,8 S Is Squeeze Maintain 0,1s 0,2s 0,1s Downstroke time Upstroke time stroke function stroke function Figure 3 — Schematicr epresentationofthecycle 5