Sheet Metal Design Guidelines
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2 Sheet Metal Design Guidelines Issue XIV, Aug
3 Copyright Notice Geometric Limited. All rights reserved. No part of this document (whether in hardcopy or electronic form) may be reproduced, stored in a retrieval system, or transmitted, in any form or by any means, electronic, mechanical, photocopying, recording, or otherwise, to any third party without the written permission of Geometric Limited. Geometric Limited reserves the right to change the information contained in this document without prior notice. The names or trademarks or registered trademarks used in this document are the sole property of the respective owners and are governed/ protected by the relevant trademark and copyright laws. This document is provided by Geometric Limited for informational purposes only, without representation or warranty of any kind, and Geometric Limited shall not be liable for errors or omissions with respect to the document. The information contained herein is provided on an AS-IS basis and to the maximum extent permitted by applicable law, Geometric Limited hereby disclaims all other warranties and conditions, either express, implied or statutory, including but not limited to, any (if any) implied warranties, duties or conditions of merchantability, of fitness for a particular purpose, of accuracy or completeness of responses, of results, of workmanlike effort, of lack of viruses, and of lack of negligence, all with regard to the document. THERE IS NO WARRANTY OR CONDITION OF NON-INFRINGEMENT OF ANY INTELLECTUAL PROPERTY RIGHTS WITH REGARD TO THE DOCUMENT. IN NO EVENT WILL GEOMETRIC LIMITED BE LIABLE TO ANY OTHER PARTY FOR LOST PROFITS, LOSS OF USE, LOSS OF DATA, OR ANY INCIDENTAL, CONSEQUENTIAL, DIRECT, INDIRECT, OR SPECIAL DAMAGES WHETHER UNDER CONTRACT, TORT, WARRANTY, OR OTHERWISE, ARISING IN ANY WAY OUT OF THIS DOCUMENT, WHETHER OR NOT SUCH PARTY HAD ADVANCE NOTICE OF THE POSSIBILITY OF SUCH DAMAGES. 3
4 Welcome to another issue of the DFM Guidebook. We highly appreciate your feedback on our previous issues. Please continue to send us your comments and suggestions for subsequent issues. This week our application engineers bring you design for sheetmetal guidelines. New DFMPro 4.0 further strengthens its sheetmetal module by adding new rules to its library of. existing rules integrated into its highly rated version 3.6. The new rules helps to address sheet metal design requirements like hole location and size, preferred sheet sizes and half shear parameters. In this issue of DFM guidebook we cover some of the latest sheet metal guidelines of DFMPro 4.0. Read the guidebook for specific rules such as Preferred Sheet Sizes, Minimum Hole Diameter, Interference in Flat Pattern, Half-Shear Parameters and Hole to Part Edge Distance If you have any feedback or questions on DFM guidebook, please write to us at Rahul Rajadhyaksha Senior Product Manager Geometric Limited 4
5 Contents Preferred Sheet Sizes...6 Minimum Hole Diameter...7 Interference in Flat Pattern...8 Half-Shear Parameters...9 Hole To Part Edge Distance
6 Preferred Sheet Sizes Length and width of a flattened sheet metal part should be as per the standard sheet sizes that are available in the inventory. Each organization has its standard or preferred sheet sizes which are in accordance with the machine s capability and setup. At the initial stage of the design, designer should be aware of unfolded sheet size and availability of corresponding appropriate sheet sizes in the inventory. This will help designer to take decision related to inventory management. Indirectly it helps to reduce inventory of non-standard sheet sizes and cost of manufacturing. Length and width of the flattened sheet metal part should be within the preferred sheet sizes used for manufacturing, depending on the material and sheet thickness. L = Sheet metal length W = Sheet metal width CL = Trimming clearance on length side CW = Trimming clearance on width side Note: For nested components, additional considerations will be required. 6
7 Minimum Hole Diameter If the punch diameter becomes too small to bear the shear force required to punch the hole over a small area, it may lead to failure. Where, d1 = Hole diameter t = Sheet metal thickness 7
8 Interference in Flat Pattern It is not feasible to manufacture a sheet metal part when its design involves interference during unfolded state of sheet metal. Interference in flat pattern should be avoided for ease of manufacturing as there should not be any interference in sheet metal component design when sheet metal part is unfolded. 8
9 Half-Shear Parameters A Semi-shear or half-shear is a blind hole that is punched on the sheet metal surface. The ratio of half-shear depth to sheet metal thickness should not be too large to avoid deformation and fracture of the metal. It is recommended that a maximum ratio of half-shear depth to sheet metal thickness should be less than or equal to 0.6 times the sheet metal thickness. t = Sheet metal thickness h = Half-shear depth 9
10 Hole To Part Edge Distance To prevent distortion or tearing, hole should be sufficiently away from the part edge. It is recommended that minimum distance from a hole to edge of a part should be at least 2 times sheet thickness T= Sheet metal thickness 10
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