مقالة بعنوان Flexus - Multi-Functional Springs with Machined Slits
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 مقالة بعنوان Flexus - Multi-Functional Springs with Machined Slits

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Flexus - Multi-Functional Springs with Machined Slits  

مقالة بعنوان Flexus - Multi-Functional Springs with Machined Slits  F_m_f_11
و المحتوى كما يلي :

● Flexus are multi-functional parts made of various materials (not only spring materials) with slits; the portion
between the slits works as a spring.
● Flexus products enable various spring properties such as compressing, tensioning, shearing, and bending.
● Due to its cutting process, exact spring constants can be obtained for use in instruments where precision and
reliability are required.
● The shape and dimensions are flexible. Polygonal shapes as well as cylinders can be manufactured.
● The shape of the hub (end portion for mounting) can also be manufactured according to individual needs.
One can reduce the number of parts required by making the spring and its attachments as an integral
construction.
● Flexus products can be designed with suitable materials such as aluminum alloys, stainless steels,
engineering plastics, copper alloys, and more thereby matching customer’s needs.Flexible Spring Functions
- Spiral Slits
NBK can make any spring function by arranging the slit shape, number, depth, and more. Furthermore,
Single Start or Multiple Start spiral slits are possible. Coil springs, as they are manufactured from one-piece
spring material, cannot have multiple start spiral slits.
Single start springs receive rotational force when compressed: axial loads are added to single start slit
springs but the multiple start slit springs do not rotate. (Fig. 1)
In addition, repellent forces and moment occur when compressed or tensile loads are added in single start
spiral slit springs. That is to say, the loading is unbalanced and single start springs are easily bent. However,
the bending moment does not occur in multiple start spiral slits which allows high precision spring function.
(Fig. 2)
Rotational Factor
Axial Factor
Single Start Springs Double Start Springs
F F F
Moment occurs because of
one directional load
Moment does not happen because
of even loads
Fig. 1- Axial factor and rotational factors,
as in single start slit springs
Fig. 2- Moment difference between single and double start springs- Straight Slits
NBK can design an approximate quadratic curve by inserting irregular pitch slits. This is a good way to
increase the spring loads when the deflection eclipses a specific value, such as when assembling equipment.
(Fig. 3)
Specific Example
The following Pic. 1 shows three different Flexus products that have 30mm outside diameters and 40mm
lengths.
NBK can control various spring functions even in products with the same outline dimensions by changing
the slit shapes, numbers, inner diameters and more.
NBK can design the loads flexibly for each customer’s needs, applications and requirements by controlling
the slits patterns. (Fig. 4)
Slit Pattern A
Pic. 1- Three slit pattern examples
Fig. 3- An example of a Flexus product with a spring
property made to approximate quadratic curve by
inserting irregular pitch slits
Slit Pattern B Slit Pattern CYou can reduce the number of the parts required with one piece construction
Typically, one needs to use some attachments (accessories) such as spring posts when installing a common
spring coil but Flexus products can be designed with one piece construction including those parts.
Doing so, will enable one to reduce the number of needed parts and enable one to save assembly procedure
and reduce space.
Example of part reduction.
0
20
40
60
80
100
120
140
160
180
200
0 0.2 0.4 0.6 0.8 1
Load [N]
Stroke [mm]
Slit Pattern A
Slit Pattern B
Slit Pattern C
Fig. 4- Each spring’s characteristics
Spring
Spring
Posts
Tensile spring parts with
three parts
Integrated structure with
Flexus
Male
Thread
Male
Thread- Flexus with integrated structure of female thread
- Flexus with integrated structure of flange
Examples of Integrated Structures
Other Usage examples
- Flexus with DD motors
Flexus products have a heat dissipation function that causes the surface area to become bigger by machining
the slits. Furthermore, it absorbs the head expansion and contraction.
Flexus
DD Motor
Stage
Base
- Flexus with integrated structure of male thread- Flexus for Vibration Absorption
If one replaces some rubber parts with Flexus products for absorbing vibration, one can improve the life
cycle or one can use high-temperature conditions that the rubber cannot endure.
To Request a Quotation or Designing
Flexus products are fully customized products.
Please let NBK know the following.
・ Intended Usage machine, equipment
・ Illustration or Drawing, Image
・ Usage Quantity
・ Materials and Surface Treatment
・ Spring Characteristics: Spring constant, Deflection
・ Maximum Size  


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