Assembly Automation and Product Design Second Edition Geoffrey Boothroyd Boothroyd Dewhurst, Inc. Wakefield, Rhode Island Boca Raton London New York . Product design for manufacture and assembly Geoffrey Boothroyd Design is the first step in manufacturing, and it is where most of the important decis. Download Assembly Automation and Product Design, Second Edition. ( Manufacturing Engineering and Materials Processing) {pdf} by. Geoffrey Boothroyd.

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Assembly Automation and Product Design, Geoffrey Boothroyd Hybrid Assemblies and Multichip Modules, Fred W. Kear High-Quality Steel Rolling: . Geoffrey Boothroyd world (in which 48% of all assembly steps are automated) requires 70% Product design for manufacture and assembly: G Boothroyd. Boothroyd G. Assembly Automation and Product Design. Файл формата pdf; размером 10,90 МБ. Добавлен пользователем Silver

Figure 3. Common assembly automation devices [source Boothroyd 91] 5 Design for Manual Assembly The Boothroyd Dewhurst method provides a quantitative measure called the design efficiency based on analysis of a product. The efficiency compares the total assembly time for a product with the total assembly time for an ideal product determined by a method suggested by the authors.

The efficiency can be used to compare various designs in terms of their relative efficiencies for manual assembly.

The design improvement is brought about by two considerations: 1. A decision is made as to whether the part can be considered a candidate for elimination, or combination with other parts of the assembly 2. An estimation of the time taken to grasp, manipulate, and insert the part. The procedure: STEP 1. Take assembly apart or imagine doing so -- assigning identification to each part as it is removed.

Consider sub-assemblies as parts, and analyse them separately recursively. STEP 3.

Begin re-assembly of the product. Start with the part with the highest identification number, going all the way up to the part 1.

Fill up the assembly worksheet as you go along. In reality, assembly workers use both hands and often assemble two parts in a step. However, a change in the assembly procedure will correspondingly change the assembly time for the ideal product -- thereby keeping the efficiency constant. Figure 4. A piston-assembly design [source Boothroyd 91] The computation is done by systematically completing the data in the following table. The data requires several estimates for assembly efficiency of different components based on their characteristics.

This data is compiled empirically — by a large number of time- motion studies conducted over may years. We will use the charts from Boothroyd handouts given in class. Table for computation of Design efficiency Source: Boothroyd One of the key features of the Boothroyd-Dewhurst method is estimation of the ideal product -- which translates to the method of filling up column 9 in the chart.

They give the following guidelines: Rule 1.

During operation of the product, does the part move relative to all other parts already assembled? Rule 2. Must the part be of a different material than the parts already assembled? If the answer to any of these questions is YES, a 1 is entered in column 9 except if there are multiple parts in column 2, in which case the minimum number of separate parts required is entered in column 9.

If yes, there is an opportunity for reduction in number of parts. STEP 2. Examine columns 4 and 6. These figures indicate potential for assembly time reduction.

Based on these ideas, a redesign of the piston assembly is presented below. Evaluating the design efficiency of the re-designed piston 10 Guidelines for improving design for assembly of mechanical products: 1.

Eliminate separate fasteners when possible. Design multi-functional parts by maximum use of the capabilities of individual manufacturing processes. For example, use near-net shape moulding and casting when possible to reduce part count. Eliminate product features that are of no value to the customer. Do not over-use piece part producibility guidelines in early stages of design -- they lead to simplified production of individual parts, but much higher part count.

Assembly Automation and Product Design Second Edition

Example: In figure 6, the single component design has potentially higher waste since an irregular shape must be cut out of the stock sheet; but the assembly cost for the second design is much higher. Single component Figure 6b. Two-component sub-assembly 2. Try to Eliminate Adjustments Why? Adjustments require decision making during assembly so…? May lead to malfunctions after some usage by customer. By elimination of parts.

Example: 2. Substitute electronic correction for mechanical adjustment. Use kinematic analysis to guide design rather than gut feeling. Examples see figure 1 3. Theory and Practice, Vladimir B. Ginzburg Murphy Assembly Line Design: Methodology and Applications, We-Min Chow Robot Technology and Applications, edited by Ulrich Rembold Scheider High-Quality Steel Rolling: Manufacturing Engineering Processes: Metalworking Fluids, edited by Jerry P.

Byers Bosch Arc Welding Automation, Howard B. Cary Facilities Planning and Materials Handling: Methods and Requirements, Vijay S. Quality in Design and Processes, Pierre C.

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Ginzburg and Robert Ballas Product Design for Manufacture and Assembly: Murat Sozer Handbook of Induction Heating, edited by Valery I. Rod and Bar Rolling: Theory and Applications, Youngseog Lee Assembly Automation and Product Design: Second Edition, Geoffrey Boothroyd. Hardcover International Standard Book Number Hardcover Library of Congress Card Number This book contains information obtained from authentic and highly regarded sources. Reprinted material is quoted with permission, and sources are indicated.

A wide variety of references are listed. Reasonable efforts have been made to publish reliable data and information, but the author and the publisher cannot assume responsibility for the validity of all materials or for the consequences of their use. No part of this book may be reprinted, reproduced, transmitted, or utilized in any form by any electronic, mechanical, or other means, now known or hereafter invented, including photocopying, microfilming, and recording, or in any information storage or retrieval system, without written permission from the publishers.

For permission to photocopy or use material electronically from this work, please access or contact the Copyright Clearance Center, Inc. For organizations that have been granted a photocopy license by the CCC, a separate system of payment has been arranged.

Trademark Notice: Product or corporate names may be trademarks or registered trademarks, and are used only for identification and explanation without intent to infringe. ISBN alk. Assembly-line methods--automation. Assembling machines. Series TS Boothroyd and A. In a later further edition, titled Automatic Assembly by G.

Boothroyd, C. Poli, and L. Murch, the original material developed at the University of Salford in England was updated with work carried out at the University of Massachusetts. In those days, it was felt that manufacturing engineers and designers wished to learn about automatic assembly as it appeared to provide a means of improving productivity and competitiveness.

Since , I developed a subject that holds much greater promise for productivity improvement and cost reduction, namely, design for assembly DFA. The DFA method has become widely used and has helped numerous companies introduce competitive product designs.

This text, therefore, includes detailed discussions of design for assembly, and the subject of assembly automation is considered in parallel with that of product design. The first step in considering automation of assembly should be careful analysis of the product design for ease of automatic assembly.

In addition, analysis of the product for ease of manual assembly should be carried out in order to provide the basis for economic comparisons of automation.

Indeed, it is often found that if a product is designed appropriately, manual assembly is so inexpensive that automation cannot be justified.

Thus, a whole chapter is devoted to design for manual assembly. Another chapter is devoted to design for high-speed automatic and robot assembly, and a third chapter deals with electronics assembly. This second edition includes, as an appendix, the popular Handbook of Feeding and Orienting Techniques for Small Parts published at the University of Massachusetts. This edition also includes the original data and coding systems for product design for high-speed automatic and robot assembly also developed at the University of Massachusetts.

Product design for manufacture and assembly

Finally, numerous problems have been added and worked solutions to all the problems are available. The book is intended to appeal to manufacturing and product engineers as well as to engineering students in colleges and universities. I wish to thank Dr. Redford for his kind permission to use material published in our original book, Mechanized Assembly, and to Drs.

Poli and L. Murch for permission to include much of the material from the Handbook of Feeding and Orienting Techniques for Small Parts, which we coauthored. Dewhurst for his contributions to our work on product design for robot assembly. Geoffrey Boothroyd.

The author or coauthor of more than journal articles, he is also the coauthor or coeditor of several books, including Fundamentals of Machining and Machine Tools, Second Edition with W. Knight , Automatic Assembly with C. Murch , and Applied Engineering Mechanics with C. Poli all titles published by Marcel Dekker. A Fellow of the Society of Manufacturing Engineers, he is a member of the National Academy of Engineering, among other professional societies. Professor Boothroyd received Ph.

Cover image: The cover shows the combination of scientific visualization and.

To introduce the concept and application for design for manufacturing and assembly to practicing designers and manufacturing engineers as well as design. Ch 17 Automated Assembly Systems Sections: Fundamentals of Automated Assembly Systems 2.

Fall Fall View 1: Introduction to Advanced Manufacturing and. Training Objective After watching the program and reviewing this printed material, the viewer will learn the basics of industrial robot technology and how robots are used in a variety of manufacturing.

Working Drawing and Assemblies Chapter 10 Objectives 1. Define working drawings. Describe how working drawings are used in industry. List the major components of a complete set of working drawings.

Lecture slides on rolling By: The crimp termination process is no exception. Many variables contribute to the results. James H. The material needed for outcome 2 is very extensive so. Technologies 1 Technologies Graduates of the Technology program are prepared to design mechanical systems, operate CAD systems, manage design projects, and perform product testing.

Examples of graduate. Discovering Business Opportunity. Chapter 2 Lead Screws 2. It has a history that stretches back to the ancient times. A very interesting.

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Design for lifetime performance and reliability III About the book The objective of this book is to provide guidelines for engineers helping them to improve machine lifetime performance and reliability.

E Mechanical, A. E Introduction Mechanical fasteners, adhesives, and welding processes can all be employed to form joints between engineering plastics. Additional provisions for Pipe Systems made of galvanized steel VdS en: Unit Mechatronic System Unit code: Understand the applications of a range of mechatronic systems.

Securitron Magnalock Corp. No parts of this work may be reproduced in any form or by. Work Cells and Cellular Manufacturing Improving the fitness of the factory 1 Cellular Manufacturing Concept of performing all of the necessary operations to make a component, subassembly, or finished product.

Mechanisation and Welding Fixture Mechanisation and Welding Fixtures As the production costs of the metal-working industry are nowadays mainly determined by the costs of labour, many factories.

All Rights Reserved. To observe changes in the force within different surfaces and different masses. Use this information sheet to assist with gripper installation and setup.

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File with maintenance.They used D F M A software to compare such factors as assembly times, part counts, assembly operations, labour costs,. After his. Design For Electromagnetic Compatibility. Often, different materials e.

Finally, Table 3 c o m p a r e s the cost of the p a r t s for the two designs. This means that parts which have little functional value such as separate fasteners and that are difficult to assemble are given the lowest ratings. For a new product, the following considerations are generally important: 1.

Examples of changes made to simplify assembly in other products never seem to apply to the product under consideration, and, in order to cover a reasonable proportion of possible design changes, the design-guideline handbook would be huge, leaving the designer to thumb through numerous examples with little chance of success in the end. No part of this book may be reprinted, reproduced, transmitted, or utilized in any form by any electronic, mechanical, or other means, now known or hereafter invented, including photocopying, microfilming, and recording, or in any information storage or retrieval system, without written permission from the publishers.

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