dfm guidebook sheetmetal design guidelines issue xviii

8/19/2019 DFM Guidebook Sheetmetal Design Guidelines Issue XVIII

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2A DEFINITIVE GUIDE TO DESIGN FOR MANUFACTURING SUCCESS

Sheet Metal Design Guidelines

Issue XVIII, March 2016


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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 permittedby 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.


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.

In this issue, we cover design guidelines that can help optimize features such as embosses, lip

and extruded form in a sheet metal forming process. Embossing is a sheet metal forming process

for producing raised or sunken designs or relief in sheet material by passing sheet between rollsof the desired pattern or by using matched male and female roller dies.

Read the guidebook for specific guidelines such as Countersink Hole Distance to Form, Emboss

to Edge Distance, Emboss to Bend Distance, Emboss Spacing, Closed Hem Parameters and

Extruded Form Spacing.

We are continuously working towards enhancing our DFM knowledgebase and adding guidelines

for next-generation processes such as additive manufacturing and tubing as well strengthening

the existing ones.

We hope you are finding the DFM Guidebook informative and worthy of your continued

interest. We will be covering newer manufacturing issues in our future issues and look forward

to your continued support.

If you have any feedback or questions on DFM guidebook, please write to us at

[email protected]

Rahul Rajadhyaksha

Senior Product Manager Geometric Limited

mailto:[email protected]:[email protected]:[email protected]


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Contents

Countersink Hole Distance to Form ........................................................................ 6

Emboss to Edge Distance ........................................................................................ 7

Emboss to Bend Distance........................................................................................ 8

Emboss Spacing ....................................................................................................... 9

Closed Hem Parameters ....................................................................................... 10

Extruded Form Spacing ......................................................................................... 11


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Countersink Hole Distance to Form

A certain minimum distance needs to be maintained between countersink hole and form to

prevent distortion of holes during manufacturing.

It is recommended that the minimum distance (D) between the major diameter of a countersink

and a form should be four times the material thickness.

Where,

t= Sheet metal thickness

D= Minimum distance between countersink hole distance to form


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Emboss to Edge Distance

Emboss is a part of forming process in sheet metal design. While designing, minimum distance

should be maintained between emboss and edge of the sheet to avoid shear and deforming. To

avoid such issues designer has to maintain sufficient gap between Emboss and part edge.

It is recommended that the minimum recommended distance between major diameters of

emboss and the edge should be four times the material thickness plus the base radius of emboss.

Where,

t= Sheet Metal thickness

D= Distance from major diameter of emboss to edge of part


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Emboss to Bend Distance

Minimum distance should be ensured between Emboss to bend in order to avoid shearing and

deformation. To avoid such issues designer has to maintain sufficient gap between Emboss and

bend.

It is recommended that minimum recommended distance between the Emboss to bend should be

greater than or equal to five times the material thickness.

Where,

t= Sheet Metal thickness

D= Minimum distance between emboss to bend


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dfm guidebook sheetmetal design guidelines issue xviii

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