1、 This document is restricted and may not be sent outside Navistar, Inc. or reproduced without permission from Corporate Technical Standards. Suppliers are required to assume all patent liability. 2015 by Navistar, Inc. DECEMBER 2015 Page 1 of 4 NAVISTAR, INC. Material, Parts, and Process Specificati
2、ons (MPAPS) NUMBER: MPAPS HT-1 Former Designation: CEMS HT-1 TITLE: Test Method - Mechanical Properties of P/M Parts CURRENT REV No.: 1512 DATE: Dec. 2015 WRITTEN/EDITED BY: J. Goldschmidt APPROVED BY: R. Goluch SUPERSEDES: Rev. April 2002 PRINTED COPIES OF THIS DOCUMENT MUST BE VERIFIED FOR CURRENT
3、 REVISION This specification may involve hazardous materials, equipment, and procedures. This specification does not purport to address all of the safety issues associated with its use. The user is responsible to consult appropriate safety and health practices and to determine the applicability of r
4、egulatory limits prior to use. Change Notice: Update to MPAPS format. 1.0 APPLICATION This is a test method for determining the crush or fracture strength of a powder metal part. 2.0 SCOPE 2.1.1 No prior testing will be allowed on any specimen to be subjected to any of these tests. 2.1.2 Rate of loa
5、d application for all tests will be 0.025 inch (0.64 mm) per minute. 3.0 METHOD A RADIAL CRUSH TEST This is a method for determining the resistance of a cylindrically shaped P/M part to a crushing force. 3.1 APPARATUS 3.1.1 Tensile testing machine. 3.1.2 Steel plates, SAE Type O1 tool steel per MPAP
6、S A-0, Part I, or equivalent. Harden to RC 58-62, grind surfaces parallel with minimum thickness of 0.75 inch (19 mm). 3.2 PROCEDURE 3.2.1 Place piece to be tested between two plates held perpendicular to the load line of application and apply a load perpendicular to axis of cylinder. (See Figures A
7、-1, A-2 and A-3.) 3.2.2 Increase the force until fracture occurs. 3.3 REPORT Crush strength. F IGUR E A - 1 F IGUR E A - 2 F IGUR E A - 3T EST PI EC E SNUMBER: MPAPS HT-1 TITLE: TITLE REVISION: 1512 This document is restricted and may not be sent outside Navistar, Inc. or reproduced without permissi
8、on from Corporate Technical Standards. Suppliers are required to assume all patent liability. 2015 by Navistar, Inc. DECEMBER 2015 Page 2 of 4 4.0 METHOD B GEAR TOOTH FRACTURE TEST This is a method for determining the tooth strength of a P/M gear. 4.1 APPARATUS 4.1.1 Tensile testing machine. 4.1.2 S
9、teel plates, SAE Type O1 tool steel per MPAPS A-0, Part I, or equivalent. Harden to RC 58-62, grind surfaces parallel with minimum thickness of 0.75 inch (19 mm). 4.1.3 Steel fixture or dowel pins, SAE Type O1 tool steel per MPAPS A-0, Part I, or equivalent. Harden to RC 58-62, with the surfaces gro
10、und. Pin diameter should be specified on the drawing. The pin length must greater than the tooth width. Pin diameter should be such that it contacts the teeth between the pitch diameter and the O.D. 4.2 PROCEDURE 4.2.1 Support the gear with specified fixturing and apply a load by a plate perpendicul
11、ar to the travel of the tensile testing machine. (See Figures B-1 and B-2). 4.2.2 Increase the force until fracture occurs. 4.3 REPORT Fracture force. H A R D E N ED AN DG R O U N D D O W EL P I NF I G U R E B - 1NUMBER: MPAPS HT-1 TITLE: TITLE REVISION: 1512 This document is restricted and may not
12、be sent outside Navistar, Inc. or reproduced without permission from Corporate Technical Standards. Suppliers are required to assume all patent liability. 2015 by Navistar, Inc. DECEMBER 2015 Page 3 of 4 DETAIL AB R E A K C OR N E R T O P R E V E N T F R OM C ON T A C T IN GS H A R P C OR N E R . S
13、U R F A C E O F S U P P O R T S H OU L D B ET A N GE N T T O S U R F A C E O F T OO T H .+-0. 0 15 0. 00 2 in( 0. 38 0 . 05 m m )+-AH A R D E N T O RC 58 - 6 2C L E A R A N C ET O S U I TT O S U I T1. 0 0 i n( 25 .4 m m )1. 0 0 i n( 25 .4 m m )1. 0 0 i n( 25 .4 m m )T O C L E A R T E E T HB Y 0 .0 0
14、3 - 0. 00 7 i n( 0. 08 - 0. 1 8 m m )FI G UR E B-25.0 METHOD C TRANSVERSE FRACTURE TEST 5.1 APPARATUS 5.1.1 Tensile Testing Machine 5.1.2 Fixturing and ram tip, SAE Type O1 tool steel per MPAPS A-0, Part I, or equivalent, hardened to RC 58-62. 5.2 PROCEDURE 5.2.1 Support the part. Apply the load per
15、pendicular to the surface of the part and parallel to the lines of support. 5.2.2 Increase the force until fracture occurs. 5.3 REPORT Fracture force. NUMBER: MPAPS HT-1 TITLE: TITLE REVISION: 1512 This document is restricted and may not be sent outside Navistar, Inc. or reproduced without permissio
16、n from Corporate Technical Standards. Suppliers are required to assume all patent liability. 2015 by Navistar, Inc. DECEMBER 2015 Page 4 of 4 NOTE: Locations of the points of support and load application must be precisely defined and maintained; a fixture will probably be required. (See Figure C.) 6
17、.0 TECHNICAL INFORMATION For further information related to the technical content of this specification, contact: Suppliers may purchase controlled copies of this specification by contacting: Materials Engineering and Technology Dept. 10400 W. North Avenue Melrose Park, IL 60160 E-mail: MaterialsEngineeringN IHS Global Inc. 15 Inverness Way East Englewood CO 80112-5776 Phone: 1-800-854-7179 E-mail: AutomotiveIHS.com Website: http:/ L O A D I N G R A M T I P M I N I M U M R A D I U S0 . 2 5 i n ( 6 . 4 m m )F I G U R E C
