ImageVerifierCode 换一换
格式:PDF , 页数:3 ,大小:123.64KB ,
资源ID:462875      下载积分:10000 积分
快捷下载
登录下载
邮箱/手机:
温馨提示:
如需开发票,请勿充值!快捷下载时,用户名和密码都是您填写的邮箱或者手机号,方便查询和重复下载(系统自动生成)。
如填写123,账号就是123,密码也是123。
特别说明:
请自助下载,系统不会自动发送文件的哦; 如果您已付费,想二次下载,请登录后访问:我的下载记录
支付方式: 支付宝扫码支付 微信扫码支付   
注意:如需开发票,请勿充值!
验证码:   换一换

加入VIP,免费下载
 

温馨提示:由于个人手机设置不同,如果发现不能下载,请复制以下地址【http://www.mydoc123.com/d-462875.html】到电脑端继续下载(重复下载不扣费)。

已注册用户请登录:
账号:
密码:
验证码:   换一换
  忘记密码?
三方登录: 微信登录  

下载须知

1: 本站所有资源如无特殊说明,都需要本地电脑安装OFFICE2007和PDF阅读器。
2: 试题试卷类文档,如果标题没有明确说明有答案则都视为没有答案,请知晓。
3: 文件的所有权益归上传用户所有。
4. 未经权益所有人同意不得将文件中的内容挪作商业或盈利用途。
5. 本站仅提供交流平台,并不能对任何下载内容负责。
6. 下载文件中如有侵权或不适当内容,请与我们联系,我们立即纠正。
7. 本站不保证下载资源的准确性、安全性和完整性, 同时也不承担用户因使用这些下载资源对自己和他人造成任何形式的伤害或损失。

版权提示 | 免责声明

本文(ASTM B946-2011(2016) Standard Test Method for Surface Finish of Powder Metallurgy (PM) Products《粉末冶金 (PM) 产品表面抛光的标准试验方法》.pdf)为本站会员(towelfact221)主动上传,麦多课文库仅提供信息存储空间,仅对用户上传内容的表现方式做保护处理,对上载内容本身不做任何修改或编辑。 若此文所含内容侵犯了您的版权或隐私,请立即通知麦多课文库(发送邮件至master@mydoc123.com或直接QQ联系客服),我们立即给予删除!

ASTM B946-2011(2016) Standard Test Method for Surface Finish of Powder Metallurgy (PM) Products《粉末冶金 (PM) 产品表面抛光的标准试验方法》.pdf

1、Designation: B946 11 (Reapproved 2016)Standard Test Method forSurface Finish of Powder Metallurgy (PM) Products1This standard is issued under the fixed designation B946; the number immediately following the designation indicates the year oforiginal adoption or, in the case of revision, the year of l

2、ast revision. A number in parentheses indicates the year of last reapproval. Asuperscript epsilon () indicates an editorial change since the last revision or reapproval.1. Scope1.1 This test method covers measuring the surface finish ofpowder metallurgy (PM) products at all stages of manufactur-ing

3、from green compact to fully hardened finished component.1.2 This test method provides the definition and schematicof some common surface finish parameters (Ra,Rt, and RzISO)1.3 The values stated in inch-pound units are to be regardedas standard. The values given in parentheses are mathematicalconver

4、sions to SI units that are provided for information onlyand are not considered standard.1.4 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

5、 and to determine theapplicability of regulatory limitations prior to use.2. Referenced Documents2.1 ASTM Standards:E691 Practice for Conducting an Interlaboratory Study toDetermine the Precision of a Test Method2.2 MPIF Standard:2MPIF Standard 58 Method for Determination of SurfaceFinish of Powder

6、Metallurgy Products3. Significance and Use3.1 The surface finish of a component may be critical forcertain applications, affecting properties such as wearresistance, fatigue strength, and coefficient of friction.3.2 Surface finish may also be critical for componentassembly or system performance. Dim

7、ensional fit and matingsurface interaction may require certain surface finish require-ments to meet performance specifications.4. Interferences4.1 Because many conventional PM materials contain openporosity at the surface, special consideration should be takenwhen measuring surface finish.4.2 The us

8、e of a conical point stylus may result in inaccurateor inconsistent surface finish results because the sharper pointof the stylus may drop into open porosity on the surface of thecomponent.4.3 A chisel point stylus may be used for better accuracyand consistency.4.4 Because the direction of pressing

9、may cause direction-ality in surface finish values, the direction of measurementshould be specified and reported.5. Apparatus5.1 Surface Finish Measuring Instrument.5.2 StylusChisel point, 0.050 in. (1.27 mm) length and0.0004 in. 6 30 % (0.010 mm 6 30 %) tip radius as shown inFig. 1. To limit the po

10、ssibility of the stylus dropping into opensurface porosity, a chisel point stylus is recommended. If acone stylus is used, filtering software shall also be used toremove the influence of open surface porosity.6. Sampling, Test Specimens, and Test Units6.1 The test surface shall be clean and free of

11、any oil, dirt,debris, or foreign material.6.2 Sufficient surface area shall be available to permitmultiple traverses by the measuring instrument.6.3 The test surface shall be flat over a sufficient length (inaccordance with instrument instructions) to allow propermovement of the stylus.7. Procedure7

12、.1 The PM parts manufacturer and purchaser shall agree onthe desired location and direction for surface finish measure-ment.7.2 Place the surface finish instrument in a position suitablefor measuring the test sample.7.3 Zero and verify the instrument over the surface finishrange expected for the tes

13、t sample.1This test method is under the jurisdiction of ASTM Committee B09 on MetalPowders and Metal Powder Products and is the direct responsibility of Subcom-mittee B09.05 on Structural Parts.Current edition approved April 1, 2016. Published April 2016. Originallyapproved in 2006. Last previous ed

14、ition approved in 2011 as B946 11. DOI:10.1520/B0946-11R16.2Available from Metal Powder Industries Federation (MPIF), 105 College Rd.East, Princeton, NJ 08540, http:/www.mpif.org.Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States17.4 Pla

15、ce the test sample under the stylus and then lower thestylus to the measuring position in accordance with theinstrument instructions.7.5 Measure the surface finish of the test surface. A mini-mum of three traverses at different locations is recommended.8. Report8.1 Report the surface finish to the n

16、earest whole number inmicroinches (micrometres). Unless otherwise indicated, thesurface finish shall be Ra(average surface roughness) (see Fig.2). Depending on the type of instrument being used, othersurface finish measures may also be reported.NOTE 1Rtis the maximum peak-to-valley height over the t

17、estedlength (absolute value between the highest and lowest peaks) as shown inFig. 3. Rzis the ten-point height or the absolute value of the five highestpeaks and five lowest valleys over the evaluation length as shown in Fig.4. Rzis also known as the ISO ten-point height parameter.8.2 If it has been

18、 specified, report the direction of measure-ment with respect to the pressing direction.9. Precision and BiasThe Precision for this standard was developed by the MetalPowder Industries Federation (MPIF) and is used herein withtheir permission.9.1 PrecisionThe precision of this test has been deter-mi

19、ned from an interlaboratory study performed in 2007 inwhich 11 Metal Powder Industries Federation laboratoriesparticipated.9.1.1 The repeatability (r) and reproducibility (R) measure-ments listed in Table 1 were determined according to PracticeE691.9.1.2 FLC2-4808 sinter-hardened transverse rupture

20、testspecimens with a sintered density of 6.94 g/cm3 and anapparent hardness of 45 HRC were used in the study. Eachlaboratory received a single TRS sample from this batch.9.1.3 On the basis of test error alone, the difference inabsolute value of two test results obtained in the samelaboratory will be

21、 expected to exceed (r) only 5% of the time.If such a difference is found to be larger than (r), there is reasonto question one or both results. Similarly, the difference in twotest results obtained in different laboratories will be expected toexceed (R) only 5% of the time. If the difference is fou

22、nd to belarger than (R), there is reason to question one or bothmeasurements.9.1.4 The analysis is based on three measurements persurface using a length of travel that varied from 0.098 inch(2.49 mm) to 0.5 inch (12.7 mm). Some laboratories used therecommended chisel stylus, others used the conventi

23、onal fullradius stylus point and one laboratory provided data using bothtypes of stylus.TABLE 1 Precision of Surface Finish Measurements on Sinter-Hardened FLC2-4808 TRS SpecimensSurfaceTestedType of Stylus SurfaceFinishrRmicroinch (micrometres)Punch Face Chisel 66 (1.65) 8 (0.20) 19 (0.48)Die Face

24、Chisel 26 (0.65) 29 (0.73) 40 (1.00)Punch Face Spherical 70 (1.75) 38 (0.95) 56 (1.40)Die Face Spherical 36 (0.90) 14 (0.35) 52 (1.30)9.2 BiasNo information can be presented on the bias ofthe procedure in Test Method B946 for measuring surfacefinish because no material having an accepted reference v

25、alueis available.10. Keywords10.1 PM; powder metallurgy; powder metallurgy parts;stylus; surface finish; surface roughnessNote 1The stylus is chisel shaped and has a standard radius on the edge andis 0.050 in. (1.27 mm) wide so that it will not drop into the porosity of the P/Msurface and give a fal

26、se reading by measuring the cavities.FIG. 1 Chisel Stylus for Surface Finish MeasurementNote 2The arithmetic average value of filtered roughness profile determinedfrom deviations about the centerline within the evaluation length lm.FIG. 2 RaArithmetic Mean Roughness ValueNote 3The maximum peak-to-va

27、lley height of the filtered profile over theevaluation length lm, irrespective of the sampling lengths le.FIG. 3 RtMaximum Peak-to-Valley HeightB946 11 (2016)2ASTM International takes no position respecting the validity of any patent rights asserted in connection with any item mentionedin this stand

28、ard. 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 review

29、ed 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 theresponsible

30、 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 Cons

31、hohocken, 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

32、photocopy the standard may also be secured from the Copyright Clearance Center, 222Rosewood Drive, Danvers, MA 01923, Tel: (978) 646-2600; http:/ 4The average height difference between the five highest peaks and five lowest valleys contained within a chosen evaluation length.FIG. 4 RzISOTen-Point HeightB946 11 (2016)3

copyright@ 2008-2019 麦多课文库(www.mydoc123.com)网站版权所有
备案/许可证编号:苏ICP备17064731号-1