design considerations for choosing between machined and wire wound springs
DESCRIPTION
Machined springs offer several benefits not available with wire wound springs, such as integrating multiple features into one piece. Gary Boehm will cover the differences between machined and wire wound springs, features and benefits, as well as application tips, including tips for using them in torsion and wrap spring clutch applications. You will learn the features and capabilities of machined springs, when to apply them, and how they can help solve many of your design challenges. Viewers will learn: – The differences between machined and wire wound springs – Application tips, including tips for using them in torsion and wrap spring clutch applications All registrants will also receive a free whitepaper when you register for the webinar.TRANSCRIPT
Design Considerations for Choosing Between Machined
and Wire Wound Springs
This webinar will be available afterwards at designworldonline.com & email
Q&A at the end of the presentation
Hashtag for this webinar: #DWwebinar
Moderator
Leslie Langnau Design World
Presenter
Gary Boehm Helical
Choosing Between
Machined and Wire Wound
Springs
5 © 2012 Helical Products Co, Inc.
A Webinar based upon the Helical White Paper
Wire Springs versus Machined Springs,
A Comparison Authored by
Gary L Boehm PE
Helical Products Co Inc, Santa Maria, CA
6 © 2012 Helical Products Co, Inc.
Founded in 1958
Invented Beam Style Couplings
© 2012 Helical Products Co, Inc. 7
Springs
© 2012 Helical Products Co, Inc. 8
Wire-Wound Springs
© 2012 Helical Products Co, Inc. 9
Springs
Wire-Wound Springs
© 2012 Helical Products Co, Inc. 10
Machined
Springs
Springs
• Wire Springs existed before the
Industrial Revolution
• First Machined Springs in 1960’s
• Now- New designs created daily
• Both are manufactured with CNC
controlled machines
11 © 2012 Helical Products Co, Inc.
Wire Wound
Springs
Machined
Springs
Precision
10% yes yes
1% maybe yes
0.1% no maybe
12 © 2012 Helical Products Co, Inc.
Wire Wound Springs are typically made from medium and high strength steels, nickel alloys, titanium and stainless steels that gain their strength predominately from heat treating and cold reduction.
CRES (Corrosion Resistant Steels), moderate to high strength
a 17-4PH per AMS5643
b 15-5PH per AMS5659
c CC455 per AMS5617
Very high strength steel
a C300 per AMS6514
Other materials of interest
a 7075-T6 Aluminum (high strength)
b 7068-T6511 Aluminum (very high strength)
c 38644 Beta C Titanium (very high strength and corrosion resistant)
d Delrin 100 (machinable plastic)
e Ultem 2300 (machinable plastic)
13 © 2012 Helical Products Co, Inc.
A long, torsion Machined
Spring using a dime for size
comparison.
Wire Springs can be larger.
A small, compression
Machined Spring.
Wire Springs can be
smaller.
14 © 2012 Helical Products Co, Inc.
Some of the many
Machined Spring
Attachments
available for
Compression and
Extension
Springs
15 © 2012 Helical Products Co, Inc.
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Flexure
Configurations
for Compression
and Extension
Springs that
resist rotation
given axial
deformation
17 © 2012 Helical Products Co, Inc.
Some of the many
Machined Spring
Attachments
available for
Torsion Springs
18 © 2012 Helical Products Co, Inc.
Multiple Start
Flexures
19 © 2012 Helical Products Co, Inc.
© 2012 Helical Products Co, Inc. 20
Triple Available only in
Machined Springs
Double Available only in
Machined Springs
Single Available in both
Wire
and
Machined Springs
© 2012 Helical Products Co, Inc. 21
Single Start Multiple Start
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Wire and Machined Springs are constructed of uniformly
shaped elastic, structural elements.
Wire and Machined Springs are influenced by a change in
“helix angle” when compressed or extended.
23 © 2012 Helical Products Co, Inc.
Helix Angle
© 2012 Helical Products Co, Inc. 24
When compressed, the helix angle is reduced and hence the
elastic rate is reduced.
When extended, the helix angle is increased and hence the
elastic rate is increased.
25 © 2012 Helical Products Co, Inc.
Compressed, Wire Springs with closed ends tend to reduce the
effective coil length as the coil contact increases. Hence, the
elastic rate is increased.
26 © 2012 Helical Products Co, Inc.
Compressed, Machined Springs do not have end coil contact, and
hence, exhibit no rate change for this reason.
27 © 2012 Helical Products Co, Inc.
Wire springs are plastically formed to create the helical shape
and end features. This activity creates residual stress that can be
partially removed by stress annealing.
Machined Springs blanks are fully annealed, and hence contain
no residual stress to influence linearity.
28 © 2012 Helical Products Co, Inc.
Multiple Started Machined Springs are
proving to be a preferred and effective
component in the creation of spring-mass
resonant systems.
29 © 2012 Helical Products Co, Inc.
© 2012 Helical Products Co, Inc. 30
Design World Leslie Langnau
[email protected] Phone: 440.234.4531 Twitter: @DW_RapidMfg
Helical Gary Boehm [email protected]; Subject: Webinar Twitter: @HelicalProducts
This webinar will be available at designworldonline.com & email
Tweet with hashtag #DWwebinar
Connect with Twitter: @DesignWorld
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