1、Designation: B754 10Standard Test Method forMeasuring and Recording the Deviations from Flatness inCopper and Copper Alloy Strip1This standard is issued under the fixed designation B754; the number immediately following the designation indicates the year oforiginal adoption or, in the case of revisi
2、on, 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.1. Scope*1.1 This test method describes a procedure for the measure-ment of distortions in thin metal strip and th
3、e application ofthese measurements to an equation that will indicate thedeviation from flatness.1.2 The distortions to be measured in this test method aredish, wavy edges, buckle, longitudinal corrugation, and her-ringbone.1.3 This test method is not intended to include the measure-ment of coil set
4、or longitudinal curl, camber or edgewisecurvature, or twist.1.4 This test method is limited to metal strip 0.003 to 0.020in. (0.08 to 0.50 mm) thick and not more than 6.0 in. (150.0mm) wide.1.5 UnitsThe values stated in inch-pound units are to beregarded as standard. The values given in parentheses
5、aremathematical conversions to SI units that are provided forinformation only and are not considered standard.1.6 The following safety hazard caveat pertains only to thetest method(s) described in this test method. This standard doesnot purport to address all of the safety concerns, if any,associate
6、d with its use. It is the responsibility of the user of thisstandard to establish appropriate safety and health practicesand determine the applicability of regulatory limitations priorto use.2. Referenced Documents2.1 ASTM Standards:2B846 Terminology for Copper and Copper Alloys3. Terminology3.1 For
7、 determination of terms relating to copper and copperalloys, refer to Terminology B846.3.2 Definitions of Terms Specific to This Standard:3.2.1 edge wave (see wavy edge), na continuous patternof waves or wrinkles along the edges of the strip, with arelatively flat center portion.4. Summary of Test M
8、ethod4.1 A prepared test specimen of a specific wrought copperor copper alloy sheet or strip of a predetermined thickness isplaced on a surface plate. The relative flatness of the sample isdetermined by measuring length and height of the irregularityand calculating percent of deviation.5. Significan
9、ce and Use5.1 This test method is intended for measuring distortion instrip used for making close tolerance parts. Since distortion inthis strip would influence the shape of the part being producedand cause difficulties in feeding through close-fitting dies andother manufacturing equipment, it is im
10、portant that this mate-rial be flat.5.2 This test method provides a universal procedure formeasuring the irregularities that cause the deviation fromflatness.5.3 This test method allows the purchaser and manufacturerto inspect strip with a standard technique to a mutually agreedupon and acceptable p
11、ercentage deviation from flatness.6. Apparatus6.1 Surface Plate, to be used as a reference flat. It must havea large enough surface area to accommodate the maximum sizetest specimen. It shall be flat within 0.0002 in. (0.005 mm) per1 in. (25 mm).6.2 Micrometer, for measuring metal thickness. It shal
12、l begraduated in 0.0001-in. (0.0025-mm) increments.6.3 Height Gage, for measuring the height of irregularities.The arm of this gage must be long enough to extend beyond thecenter of the widest strip to be measured. It shall be graduatedin 0.001-in. (0.025-mm) increments.36.4 Steel Rule, for measurin
13、g the lengths of the irregulari-ties. It shall be graduated in 0.02-in. (0.50-mm) increments.1This test method is under the jurisdiction of ASTM Committee B05 on Copperand Copper Alloys and is the direct responsibility of Subcommittee B05.06 onMethods of Test.Current edition approved Oct. 1, 2010. P
14、ublished November 2010. Originallyapproved in 1986. Last previous edition approved 2005 as B754 89 (2005). DOI:10.1520/B0754-10.2For referenced ASTM standards, visit the ASTM website, www.astm.org, orcontact ASTM Customer Service at serviceastm.org. For Annual Book of ASTMStandards volume informatio
15、n, refer to the standards Document Summary page onthe ASTM website.3An electronic touch sensitive system, which will not distort the sample, hasbeen found to be acceptable.1*A Summary of Changes section appears at the end of this standard.Copyright ASTM International, 100 Barr Harbor Drive, PO Box C
16、700, West Conshohocken, PA 19428-2959, United States.7. Test Specimens7.1 The test specimen shall be the full-finished slit width ofthe strip and cut long enough so that measurement will not beinfluenced by the distortions referred to in 1.3.7.2 When cutting specimens, caution must be taken topreven
17、t additional distortion.8. Procedure8.1 Measure the thickness of the specimen at six locations,near each corner and at midwidth at each end, to the nearest0.001 in. (0.03 mm) using the micrometer. The average of thesesix readings will be used as T.8.2 Place the test strip unrestrained on the surface
18、 plate. Ifthe specimen is not flat, compare the irregularities observedwith the illustrations shown in Figs. 1-5 to determine the typeof distortion and how it should be measured.8.3 Using the height gage, measure the highest point H ofeach of the irregularities to the nearest 0.001 in. (0.03 mm). Se
19、eFigs. 1-6.8.4 Using the steel rule, measure the length L between thepoints where the outer radii of the most significant irregularitytouches the surface plate, to the nearest 0.02 in. (0.50 mm). SeeFigs. 1-7.8.5 Repeat this procedure as often as necessary to satisfyquality level requirements, recor
20、ding each measurement.9. Calculation or Interpretation of Results9.1 Apply the values for T, H, and L obtained for eachirregularity to the following equation to determine the percent-age of deviation from flat.Deviation from flat, % 5H 2 TL3 100 (1)Compare the results to the agreed upon limits. The
21、larger thepercentage, the greater the deviation from flat.10. Report10.1 The nominal thickness, width, temper, alloy number,and form of product should be reported.10.2 The number and type of distortions measured and thethickness, height, length, and percent deviation from flatnessfor each should be
22、reported.11. Precision and Bias11.1 The precision of this test method is dependent upon thesensitivity of the measuring apparatus.11.2 This test method has no bias because the values ofdeviation from flatness are direct measurements based on theaccuracy of the test apparatus and the observations of
23、theinspector.12. Keywords12.1 edge wave; flatness measurement; strip distortion; stripflatness; wavy edgeSUMMARY OF CHANGESCommittee B05 has identified the location of selected changes to this standard since the last issue (B754 - 89(2005) that may impact the use of this standard. (Approved Oct. 1,
24、2010.)(1) Changed Terminology to refer specific term references toB846.(2) Added Summary of Test Method Section 4.(3) In Terminology added the appropriate “part of speech”designation.FIG. 1 DishB754 102FIG. 2 Wavy EdgesNOTE 1For illustration only. Section to show measuring.FIG. 3 BuckleFIG. 4 Longit
25、udinal CorrugationB754 103FIG. 5 HerringboneFIG. 6 Measuring Height of Irregularity With Height GageB754 104FIG. 7 Measuring Length of Irregularity With Steel RuleASTM International takes no position respecting the validity of any patent rights asserted in connection with any item mentionedin this s
26、tandard. Users of this standard are expressly advised that determination of the validity of any such patent rights, and the riskof infringement of such rights, are entirely their own responsibility.This standard is subject to revision at any time by the responsible technical committee and must be re
27、viewed every five years andif not revised, either reapproved or withdrawn. Your comments are invited either for revision of this standard or for additional standardsand should be addressed to ASTM International Headquarters. Your comments will receive careful consideration at a meeting of therespons
28、ible technical committee, which you may attend. If you feel that your comments have not received a fair hearing you shouldmake your views known to the ASTM Committee on Standards, at the address shown below.This standard is copyrighted by ASTM International, 100 Barr Harbor Drive, PO Box C700, West
29、Conshohocken, PA 19428-2959,United States. Individual reprints (single or multiple copies) of this standard may be obtained by contacting ASTM at the aboveaddress or at 610-832-9585 (phone), 610-832-9555 (fax), or serviceastm.org (e-mail); or through the ASTM website(www.astm.org). Permission rights to photocopy the standard may also be secured from the ASTM website (www.astm.org/COPYRIGHT/).B754 105
