ASTM_D_617_-_84_1998.pdf

Designation:D 617 84(Reapproved 1998)An American National StandardStandard Test Method forPunching Quality of Phenolic Laminated Sheets1This standard is issued under the fixed designation D 617;the number immediately following the designation indicates the year oforiginal adoption or,in the case of revision,the year of last revision.A number in parentheses indicates the year of last reapproval.Asuperscript epsilon()indicates an editorial change since the last revision or reapproval.This standard has been approved for use by agencies of the Department of Defense.1.Scope1.1 This test method covers the determination of the punch-ing quality of phenolic laminated sheets18in.(3.2 mm)andunder in thickness.It involves the use of a standard punchingdie and standard punching practice to form punched specimensboth at room temperature,designated as cold punching,and atan elevated temperature of 135C,designated as hot punching,and a standard system for rating the punched specimensproduced.1.2 The values stated in inch-pound units are to be regardedas the standard.1.3 This standard does not purport to address all of thesafety concerns,if any,associated with its use.It is theresponsibility of the user of this standard to establish appro-priate safety and health practices and determine the applica-bility of regulatory limitations prior to use.2.Referenced Documents2.1 ASTM Standards:D 229 Test Methods for Rigid Sheet and Plate MaterialsUsed for Electrical Insulation2D 785 Test Method for Rockwell Hardness of Plastics andElectrical Insulating Materials3E 18 Test Methods for Rockwell Hardness and RockwellSuperficial Hardness of Metallic Materials43.Significance and Use3.1 This test method further provides for a control test onuniformity of punching quality after this property has beendetermined with the punching die for a particular grade andthickness.The control test consists in the determination ofRockwell hardness at room temperature,and Rockwell hard-ness at 135C under a definitely prescribed procedure.54.Apparatus4.1 Punching DieA compound die.64.2 OvenAn oven that will provide a temperature of 1356 2C.4.3 Hardness TesterA Rockwell hardness tester conform-ing to the requirements prescribed in Test Methods E 18.5.Test Specimens5.1 Punching Test SpecimensUse two strips of the mate-rial,each 158in.(41 mm)in width by 12 in.(305 mm)inlength,one cut lengthwise and one cut crosswise from the sheetfor punching out specimens in the compound die.The dimen-sions of the punched specimen are shown in Fig.1.5.2 Hardness Test SpecimensThe specimen for the coldRockwell hardness test and hot Rockwell hardness test shallconform to that prescribed in Test Method D 785,except thatthe specimen for the hot Rockwell hardness test shall be 1 in.(25 mm)square.6.Preparation of Apparatus6.1 The results obtained with this test method will dependupon the care taken in properly assembling the die as well asin the condition of the punch and die.It is recommended thata standard die set be used in order to ensure proper alignmentof the punch and die at all times.Examine the cutting edges ofthe punches,as well as those of the die,for sharpness.If thesurfaces are not flat and if the edges are not sharp,it isadvisable to grind the surfaces of both the punch and die toensure good punching.1This test method is under the jurisdiction of ASTM Committee D-9 onElectrical and Electronic Insulating Materials and is the direct responsibility ofSubcommittee D09.07 on Flexible and Rigid Insulating Materials.Current edition approved Nov.30,1984.Published January 1985.Originallyissued as D 617 41 T.Last previous edition D 617 84(1989).2Annual Book of ASTM Standards,Vol 10.01.3Annual Book of ASTM Standards,Vol 08.01.4Annual Book of ASTM Standards,Vol 03.01.5Another punching method in use is the German punchability rating system DIN53-488.Copies are obtainable at a nominal cost fromASTM Headquarters,100 BarrHarbor Drive,West Conshohocken,PA 19428.Request Adjunct No.ADJD0617.6Detailed drawings of the dimensions of the compound die are available at anominal cost from ASTM Headquarters,100 Barr Harbor Drive,West Consho-hocken,PA 19428.Request adjunct No.ADJD0617.1Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959,United States.NOTICE:This standard has either been superseded and replaced by a new version or withdrawn.Contact ASTM International(www.astm.org)for the latest information.6.2 Set the punching die in the press in a vertical or slightlyinclined position and align it well.The punch shall enter the dieabout164to132in.(0.038 to 0.8 mm).The clearancesmaintained between the punch and die shall be 0.002 in.(0.05mm).7.Procedure for Punching7.1 Punch specimens out individually by means of footrelease of the press.Do not use continuous punching ofspecimens.Guide the strips so that the punched specimen is inthe center of the strip.Punch no specimens closer together thantwice the thickness of the strip.The length of stroke of thepu