SAE TECHNICAL PAPER SERIES 970428 Development ofaWarm Compacted Automatic Transmission Torque Converter Hub Thomas Miller Chicago Powdered Metal Products Company Francis Hanejko Hoeganaes Corporation International Congress &Exposition Detroit, Michigan February 24-27, 1997 400Commonwealth Drive, Warrendale, PA15096-0001 U.S.A. Tel:(412)776-4841 Fax:(412)776-5760 Downloaded from SAE International by University of British Columbia, Tuesday, September 25, 2018The appearance of the ISSN code at the bottom of this page indicates SAE's consent that copies of the pape rmay be made for personal or internal use of specific clients. This consent is given on the condition however, that the copierpaya$7.00perarticlecopyfee through the Copyright Clearance Center, Inc. Operations Center, 222 Rosewood Drive, Danvers, MA 01923forcopyingbeyondthatpermittedby Sections 107 or108oftheU.S. Copyright Law. This consent does not extend to other kinds of copying such as copying for general distribution, for advertisingorpromotjonal purposes, forcreating new collective works, or for resale. SAE routinely stocks printed papers for a period of three years following date of publication. Direct your orders to SAE Customer Sales and Satisfaction Department. Quantity reprint rates can be obtained from the Customer Sales and Satisfaction Depart­ ment To request permission to reprint a technical paperor permission to use copyrighted SAE publications in otherworks, contact the SAE Publications Group. No part of this publication may by reproduced in any form, in an electronic retrieval system or otherwise, without the prior written permission of the publisher. ISSN0148-7191 Copyright1997 Society of Automotive Engineers, Inc. Positions and opinions advanced in thispaperarethose of the author(s)and not necessarily those of SAE. The author is solely responsibieforthe content of the paper. Aprocessis available by which discussions will be printed with the paper if it is published in SAE Transactions. For permission to publish this paper in full or in part, contact the SAE Publications Group. Persons wishingtosubmit papers to be considered forpresentation or publication through SAE should send the manuscript or a 300 word abstract of a proposed manuscript to: Secretary, Engineering Meetings Board, SAE. Printed in USA Downloaded from SAE International by University of British Columbia, Tuesday, September 25, 2018970428 Development ofaWarm Compacted Automatic Transmission Torque Converter Hub Thomas Miller Chicago Powdered Metal Products Company Francis Hanejko Hoeganaes Corporation ABSTRACT Turbine hubs forautomatic transmission torque converters areideal candidates forthepowder metallurgy (P/M) process. Thecomplex shape of turbine hubs iscostly toproduce viaconventional forging andmachining operations. Increases inengine sizeandtorque requirements byautomotive designers require turbine hubs topossess high levels of mechanical properties. High density P/M manufacturing techniques, incombination with high performance ferrous material produces components capable ofreplacing aforged andmachined turbine hub. This paper willreview theconversion ofa conventionally forged andmachined turbine hubused in ahightorque automatic transmission toasingle pressed andsingle sintered P/Mturbine hub. Thematerial used fortheP/M hubwas anMPIF FD-0405. Warm compaction processing achieved significantly increased overall sintered densities inthehighly stressed internal spline region. Extensive mechanical andpartspecific testing wasconducted toverify thesuitability ofthe P/Mpart. INTRODUCTION TheuseofPowder Metallurgy (P/M) components hasgrown atarateofapproximately 7% annually since 1990.1 During thisperiod, theusage of P/Mcomponents intheNorth American autosector increased from 23pounds pervehicle toinexcess of28 pounds pervehicle.1 Notable recent applications i