Chemical Engineering February 2016 - 48

Feature Report
The Relationship Between
Materials Selection and
Machining Processes
An awareness of the impact of materials selection on the machining processes for
small, complex components can affect overall end-product quality and costs
Kenneth Rinier
Vallorbs Jewel Co.
In BrIef
MATERIAl SElECTIon
FACToRS
THREAdEd PARTS And
VAlVES
MACHInIng
SPECIFICATIon
MACHInIng SoluTIonS
FIGURE 1. There are many implications
for materials selection of threaded
parts, especially when the machining
process is considered
T
48
he importance of material selection
for small, complex components found
in equipment critical to the chemical
process industries (CPI) cannot be
understated. For small metal parts, such
as valves and threaded fasteners, the steps
product engineers take for selecting a material
are fairly linear. The engineer determines
the functionality and the operating environment
of the components and chooses the
material. Environmental factors taken into
consideration include corrosion resistance,
exposure to harsh chemicals and extreme
temperatures. After evaluating the material
based on these conditions, design engineers
often make the final material decision for the
specific part. However, the desired material
may have certain properties that can present
challenges in operation and machining, and
the designer may not be aware of the potential
issues that can arise.
There is an important relationship between
material selection and precision, ease of machining
and final finish that is often overlooked.
These factors can have significant effects
on the quality and cost of the component in
question. The use of an ineffective machining
method for small components can cause issues
in certain materials, especially if they are
exotic or hard-to-machine metals. These issues
include fouled operating environments,
premature component failure and oxidation
effects, and are sometimes the result of inadequate
machining and material selection. This
article provides guidance to help design engineers
consider the relationship between material
selection, existing machining processes
and the quality and cost of the end product.
ChemiCal engineering www.Chemengonline.Com february 2016

http://www.Chemengonline.Com

Chemical Engineering February 2016

Table of Contents for the Digital Edition of Chemical Engineering February 2016

Contents
Chemical Engineering February 2016 - Cover1
Chemical Engineering February 2016 - Cover2
Chemical Engineering February 2016 - Contents
Chemical Engineering February 2016 - 2
Chemical Engineering February 2016 - 3
Chemical Engineering February 2016 - 4
Chemical Engineering February 2016 - 5
Chemical Engineering February 2016 - 6
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Chemical Engineering February 2016 - Cover3
Chemical Engineering February 2016 - Cover4
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