Library of Congress Cataloging-in-Publication Data Design formanufacturability handbook / James G. Bralla, editor. 2nd ed. p.cm. Rev. ed. of: Handbook of product design for manufacturing.1986. Includes index. ISBN 0-07-007139-X (alk. paper) 1. ProductionengineeringHandbooks, manuals, etc. 2. Engineering designHandbooks,manuals, etc. I. Bralla, James G. II. Title: Handbook of productdesign for manufacturing. TS176.H337 1998 670.42dc21 98-23438CIP
This is a reference book for those practicing or otherwisehaving an interest in designfor manufacturability (DFM). DFMprinciples and guidelines are many; no one personshould be expectedto remember them all nor the detailed information, such assug-gested dimensional tolerances, process limits, expected surfacefinish values, or otherdetails, of each manufacturing process. Itis expected that those involved will keep thisbook handy forreference when needed.
Design For Manufacturability Handbook, 2ed By James Bralla [PDF]l
Design recommendations are of two kinds: general designconsiderations anddetailed design recommendations. The former coverthe major factors that designersshould take into consideration tooptimize the manufacturability of their designs. Suchfactors asshrinkage (castings and molded parts), machining allowances, thefeasibilityof undercuts, and the necessity for fillets and radiiare discussed.
Detailed design recommendations include numerous specific tipsto aid in develop-ing the most producible designs with eachprocess. Most of these are illustrated and arein the form of do,dont, this, not this, or feasible, preferable so that both thepre-ferred and less desirable design alternatives are shown. Theobjective of these subsec-tions is to cover each characteristichaving a significant bearing on manufacturability.
This book also does not contain very much functional designinformation. There islittle material on strength of components,wear resistance, structural rigidity, thermalexpansion, coefficientof friction, etc. It may be argued that these kinds of dataareessential to proper design and that consideration of design onlyfrom a manufactura-bility standpoint is one-sided. It cannot bedenied that functional design considerationsare essential toproduct design. However, these factors are covered extensivelyandwell in innumerable handbooks and other references, and it wouldbe neither economi-cally feasible nor practicable to include themin this book. This handbook is to be usedin conjunction with suchreferences. The subjects of functional design and designformanufacturability are complementary aspects of the same basicsubject matter. In thisrespect, DFM is no different from industrialdesign, which deals with product appear-ance, or reliability designor anticorrosion design, to cite some examples of subsidiarydesignengineering disciplines that have been the subject of separatehandbooks.
It is to the latter function that this handbook is most directlyaimed. In the well-runproduct design and manufacturingorganization, a team approach is used, and theproduct engineer andmanufacturing engineer work together to ensure that theproductdesign provides the best manufacturability.
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