Guideline3_3

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School

University of Maryland, College Park *

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Course

489O

Subject

Mechanical Engineering

Date

Dec 6, 2023

Type

docx

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2

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ENME 489O – Fall 2023 DFM Rules Name: Nathan Gernand Date: 10/1/2023 Rule Name: Minimize use of adhesives and sealants Rule Number: 1.3 Rule Description: This set of rules will give guidance on how to avoid using sealants and other adhesives and why you should avoid doing so when designing for assembly. Background of Rule (Context): When relying on something like an adhesive to keep parts together, there are a lot of things that can go wrong. Although adhesives are very useful and helpful in many scenarios, mass producing assemblies is typically not one of them. For example, adhesives are used to join things such as parts together. To do this requires an immense amount of precision, and to apply this adhesive with a machine would take a very expensive machine due to the amount of precision required. It is therefore recommended to use mechanical fasteners as a replacement for these. These fasteners do add to the part count, but they are replaceable, which adhesive is not, and fasteners are also way more cost efficient for an assembly. An argument for using an adhesive would be for when you are doing some DIY maintenance on a part or assembly. Often times, a person may not have a proper fastener at their disposal to fix the problem at hand. An adhesive such as glue can be seen as an easy fix for many problems such as broken assemblies to keep them together for the time being, However, this adhesive will break down over time and not serve to be as permanent of a fix as a mechanical fastener. Rule Condition (If statement): a) If you are trying to secure parts that have complex or odd shapes b) If the assembly will likely require maintenance or repair in a certain area c) If you want to incorporate a bond type that is more resistant to environmental wear and tear Rule Consequence (Then statement): a) Then the usage of adhesives is warranted as common fasteners are not typically used in this situation b) Then mechanical fasteners are advised to be used c) Then mechanical fasteners should be used as they are much less susceptible to environmental degradation Rule Illustrations (if needed):
Rule Justification: By following this set of rules designers and engineers can improve: Ability to repair: By consulting the information provided under this rule, designers can determine when adhesive can be used based on if repair may be needed in the future Cost: Determine when adhesives or fasteners may be more or less cost effective Rule Source: Curet, A. (2014, January 21). Mechanical vs. Adhesive bonds in assembly . Adhesives Sealants Industry RSS. https://www.adhesivesmag.com/articles/92324-mechanical-vs-adhesive- bonds-in-assembly
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