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VIBLESS™
© 2012 NIPPON STEEL & SUMITOMO METAL CORPORATION All Right ReservedU044en_01_201211f
2-6-1 Marunouchi, Chiyoda-ku,Tokyo 100-8071 JapanTel: +81-3-6867-4111
http://www.nssmc.com/
Flat Products
VIBLESS™
Noise-prevention Methods
Glass Wool, Wood, Wool,Cement Excelsior Board, Concrete,Thick-Gauge Steel Sheet
Ⓐ Sound Insulation and Absorption
VIBLESS, Damping Sheet, Damping Alloy, Rubber, Wood, Plastics, etc.
Ⓑ Vibration Damping and Absorption
VIBLESS is effective in the case of Ⓑ above. It demonstrates particularly high performance when used in direct contact with a source of vibration or when incorporated in such a source.
1
Noise is occurring more frequently in daily life. Accordingly, it seems that because of this, even our hearts produce heartless sounds. Putting much value on peaceful moments and quiet places — such feelings are becoming more apparent not only in industry but in our homes as well.
One powerful way to create quietude is to use VIBLESS, a vibration-damping steel sheet supplied by NIPPON STEEL & SUMITOMO METAL. This product not only maintains advantages such as the high strength and excellent workability that are peculiar to steel sheets but also offers high vibration-damping capacity. VIBLESS is used widely as a material in automobile parts, electrical home appliances, and building construction where it helps to create quietness.
Preserving the Quiet VIBLESS™
Major Features of VIBLESS ❶ Outstanding Vibration-damping Capacity
❷ Excellent Press-formability
❸ Available Spot Welding for Certain Types
❹ High-temperature Baked Finish Available with Thermosetting Type
❺ High Reliability Demonstrated by Proven Durability and Abundant Records of Usage in Such Fields as Automobile Oil Pans and Electrical Home Appliances
❻ Nearly Identical Treatment for Both VIBLESS Scrap and General Steel Scrap
1. Noise and Noise Prevention, and Vibration-damping Capacity of VIBLESS
Contents
1. Noise and Noise Prevention, and Vibration-damping Capacity of VIBLESS……1
2. Structure and Vibration-damping Effect of VIBLESS……2 3. Classification Symbols and Typical Types of VIBLESS……4 4. Size Availability of VIBLESS……5 5. Properties of VIBLESS……6 6. Heat Resistance……8 7. Durability……9 8. Typical Applications……10 9. Packaging and Markings……1210. Reference Information on Usage……13References VIBLESS Production Line……14 Methods for Measuring Vibration-damping Capacity……15 Methods for Measuring Adhesive Strength……15
Based on the provisions specified in Article 68-26, Item 1 of the Building Standard Law of Japan (including cases covered by Article 88, Item 1 of the Law), VIBLESS has been approved by the Minister of Land, Infrastructure and Transport as a material conforming to the provisions on incombustible materials specified in Article 2, No. 9 of the Law and in Article 108-2 of the Enforcement Order of the Law.
Notice: While every effort has been made to ensure the accuracy of the information contained within this publication, the use of the information is at the reader’s risk and no warranty is implied or expressed by Nippon Steel & Sumitomo Metal Corporation with respect to the use of the information contained herein. The information in this publication is subject to change or modification without notice. Please contact the Nippon Steel & Sumitomo Metal Corporation office for the latest information. Please refrain from unauthorized reproduction or copying of the contents of this publication.The names of our products and services shown in this publication are trademarks or registered trademarks of Nippon Steel & Sumitomo Metal Corporation, affiliated companies, or third parties granting rights to Nippon Steel & Sumitomo Metal Corporation or affiliated companies. Other product or service names shown may be trademarks or registered trademarks of their respective owners.
Noise-prevention methods are broadly divisible into two categories:Ⓐ The absorption or insulation of noiseⒷ The damping of vibrations that generate noise, thus minimizing noise
2 3
2. Structure and Vibration-damping Effect of VIBLESS
StructureStructurally, VIBLESS consists of two steel sheets sandwiching an approximately 40 to 60μm-thick layer of visco-elastic resin. The vibration-damping mechanism of this sheet is based on the shear deformation of the visco-elastic resin which transforms vibration energy into thermal energy.
Vibration-damping Effect and Characteristics(1) The vibration-damping capacity is usually given by the loss factor “ η ”. The higher this value, the
greater the vibration-damping effect. VIBLESS is available for room-, intermediate- and high-temperature uses, so that its vibration-damping potential may be fully utilized according to service temperature. (Fig. 1)
(2) Also available is VIBLESS for new intermediate-temperature use with an effective temperature range from room to high temperature, though it is slightly inferior in vibration-damping performance.
Shear deformation of the visco-elastic resin layer caused by vibration has the effect of damping vibration.
Shear
40~60μm
Visco-elastic Resin Layer
Steel Sheets
Steel Sheet
Steel Sheet
Resin Layer About 40~60μm Thick
-20 0
7
23
57
10-1
23
57
100
10-2
20 40 60 80 100 120
For Room-temperature Use
For Intermediate-temperature Use
For High-temperature Use
Temperature (°C)
Loss
Fac
tor
( η)
Relation Between the Loss Factor of VIBLESS and TemperatureFig. 1
at 500 Hz
(3) A comparison of the loss factor “ η ” of VIBLESS with that of other materials is shown in Fig. 2; their respective vibration-damping wave patterns are given in Fig. 3.
VIBLESS is superior in vibration-damping and has the high strength inherent in steel sheet.
(4) Fig. 4 gives loss factors measured at respective temperatures when oil has been poured into an actual oil pan. It shows the excellent vibration-damping capacity of VIBLESS.
(5) Sound-insulation Effect of VIBLESS The sound transmission loss of VIBLESS follows the law of mass. When compared with that
of ordinary steel sheet, it has the following characteristics. ① No lowering of the sound transmission loss at resonance coincidence② Sometimes sound-insulating materials will themselves vibrate and generate sound due to
the transmission of vibrations caused by large sound pressure or vibrations generated at the sound source. VIBLESS suppresses these vibrations, preventing the generation of sound.
Relation Between the Vibration-damping Capacity and Strength of Individual Materials at Room Temperature
0.0001 0.001 0.01 0.1
1
10
100
1000
Greater Vibration-damping Capacity →Loss Factor (η)
Tens
ile S
tren
gth
(N/m
m2)
Steel Sheet
Vibration-damping Alloy
Vibration-damping Material-laminated Steel Sheet
Plastics Rubber
Wood
VIBLESS
Fig. 2
20 40 60 80 100 1203
57
10-223
57
10-1
Oil Temperature (°C)
Loss
Fac
tor
( η)
Point of Measurement
Cold-rolled Steel Sheet
Relation Between Loss Factor and Oil Temperature When VIBLESS is Used in Oil Pans
Fig. 4
VIBLESS
126 200 315 500 800 1.25K 2K 3.15K 5K 8K
10
20
30
40
50
Ordinary Sound (90 dB) Intense Sound (110 dB)Vibration-damping Sheet Steel Sheet Mass Line
Frequency (Hz)
Sou
nd T
rans
mis
sion
Los
s (d
B)
VIBLESS
Ordinary Steel Sheet
Law of Mass
(5)-①
(5)-②
50 msec
50 msec
50 msec
50 msec
( )
( )
( )
( )
Material (Thickness) Loss Factor (η) Vibration-damping Wave Pattern
VIBLESS(0.8 + 0.8 mm)
Vibration-damping Mate-rial (2.0 mm)-laminated Steel Sheet (0.8 mm)
Vibration-damping Alloy (YUS 430D)(1.6 mm)
Cold-rolled Steel Sheet (1.6 mm)
Resonant Frequency 182 Hz
Resonant Frequency 121 Hz
Resonant Frequency 209.3 Hz
Resonant Frequency 219.2 Hz
0.3
0.1
0.02
0.0005
Loss Factor and Corresponding Vibration-damping Wave Pattern
Fig. 3
4 5
3. Classification Symbols and Typical Types of VIBLESS
4. Size Availability of VIBLESS
❶ Classification Symbols for VIBLESSSymbols in the specifications of VIBLESS mean :
❷ Typical Characteristics of VIBLESSThe available types of VIBLESS vary with service temperature.Please select the most suitable type.
❸ Coating Mass Symbol of VIBLESSPlease refer to the standards for such base steel sheets as electrogalvanized sheets and iron-zinc alloy-coated steel sheets.
❹ Surface Treatment of VIBLESSBecause the available surface treatments differ according to the type of coating, please consult us.
Examples of Classification Symbols
Notes •VIBLESS using steel sheets other than those listed are available. Please consult us.
Notes •The data shown are for a typical thermosetting resin and general type VIBLESS of commercial grade using cold-rolled steel sheets, 1.6 (0.8 + 0.8) mm thick.
① Measurement examples by means of the center-support stationary excitation method conforming to JIS G 0602 ② Shear adhesive strength : Measurement examples conforming to JIS K 6850 ③ T-peel strength : Measurement examples conforming to JIS K 6854•N/cm2 = 9.80665 × kgf/cm2, N/25 mm = 9.80665 × kgf/25 mm
Example
Grade (commercial)
Type of Lower Sheet(ZINKOTE, Electrogalvanized Sheet)
Type of Upper Sheet(ZINKOTE, Electrogalvanized Sheet)
V E E C
Vibless
Type of Sheet CommercialGrade
Drawing Grade
Deep-drawing Grade
Extradeep-drawing Grade Remarks
Cold-rolled Steel Sheet VCCC VCCD VCCE VCCX
Electrogalvanized Steel Sheet VEEC VEED VEEE VEEX ZINKOTE
Iron-Zinc Alloy-coated Steel Sheet VAAC VAAD VAAE — DURGRIP (Galvannealed)
ClassificationApplicable
Temperature Range (°C)
Weldability
Vibration-damping Property Adhesive Strength
η -max500 Hz
Shear Adhesion(N/cm2)
T-peel Strength(N/25 mm)
Room-temperature Use 20 〜 40 ○ 0.20 800 100
Intermediate-temperature Use 40 〜 80 ○ 0.15 1000 140
High-temperature Use 70 〜 100 ○ 0.15 1500 180
M No Treatment
QM High-functional Chromate-free Treatment
QB Chromate-free Phosphate Treatment
1250600
1.0 + 1.0
0.4 + 0.4
0.6 + 0.6
① Cold-rolled Steel Sheets
Extradeep- drawing Grade
Commercial ~Deep-drawing Grades
Sheet Width (mm)
Thic
knes
s (m
m)
(U
pp
er +
Low
er)
1250600
1.0 + 1.0
0.4 + 0.4
0.6 + 0.6
② Electrogalvanized Steel Sheets
Commercial ~ Deep-drawing Grades
Extradeep- drawing Grade
Sheet Width (mm)
Thic
knes
s (m
m)
(U
pp
er +
Low
er)
1250600
1.0 + 1.0
0.4 + 0.40.5 + 0.5
③ Iron-Zinc Alloy-coated Steel Sheets
CommercialGrade
Drawing Grade, Deep-drawing Grade
Sheet Width (mm)
Thic
knes
s (m
m)
(U
pp
er +
Low
er)
: Because the available size range changes slightly
depending on the kind of steel sheets and
viscoelastic resins adopted, please consult us
concerning the details of size availability.
6 7
5. Properties of VIBLESS
❶ Examples of Tensile Test Values (Test Piece: JIS No. 5) ❹ Resistance Weldability
❷ Formability of VIBLESS
❸ Fatigue Property
Type of Base Sheet Yield Point(N/mm2)
Tensile Strength(N/mm2)
Elongation(%) r̄̄ Value
Cold-rolled Steel Sheets (t = 0.8 mm) of Deep-drawing Grade 150 290 50 2.00
VIBLESS(t = 0.8 + 0.8)
For Room-temperature Use 146 283 50 2.01
For Intermediate-temperature Use 146 285 50 2.02
For High-temperature Use 145 285 51 2.02
⃝ The yield point and tensile strength of VIBLESS are slightly lower than those of the cold-rolled steel sheets used.
⃝ The r value of VIBLESS is slightly higher than that of cold-rolled steel sheets used.
50 100 150 200
Relation Between Various Kinds of Formability and Shear Adhesive Strength
Shear Adhesive Strength (kgf/cm2)
Poo
r ←
Form
abili
ty →
Goo
d
Body Wrinkling Resistance
End Hardenability (Flange up)Flange Wrinkling Resistance
Deep Drawability
Deep Drawability
Flange Wrinkle
Flange up
Body Wrinkle
Levels of Ordinary Steel Sheets of Half the Thickness
Levels of Ordinary Steel Sheet of the Same Thickness
→→
at 25°C
104 1052 3 5 7 1062 3 5 7 1072 3 5 7 2 310
20
30
Plane-bending Fatigue Test
Cold-rolled Steel Sheet (1.6 t)
VIBLESS (0.8/0.8 t)
VIBLESS (Weldable)(0.8/0.8 t)
Number of Cycles to Failure (cycle)
Str
ess
(kgf
/mm
2 )
170 180 190 200 210 2200
5
10
15
20
mm100
In general, formability improves with increased adhesive strength.In drawing VIBLESS, apply a higher blank holding force than when working with ordinary steel sheet.Since the properties of VIBLESS vary with the type of the intermediate visco-elastic resin layer, please consult us before using.
•
•
•
Relation Between Cylindrical Deep-drawing limit and Blank Holding Force
Blank Diameter (mmφ)
Bla
nk H
old
ing
Forc
e (to
n)
Cold-rolled Steel Sheet for Deep Drawing (1.2 mm Thick)
Lubricant :Rust-preventive Oil
Wrinkling Limit
Breaking Point
VIBLESS (0.6 + 0.6 mm)
The fatigue property of VIBLESS is virtually equal to that of cold-rolled steel sheet, as shown in the figure.
① VIBLESS (Commercial Grade)Welding of VIBLESS requires a supporting electrode system, because of the intermediate layer of nonconductive, elastic high polymer. The use of the supporting electrode system developed by NIPPON STEEL & SUMITOMO METAL enables both spot and projection welding to be performed in a manner similar to that for cold-rolled steel sheet.
② Weldable VIBLESSConductive metal particles are added to the intermediate resin layer. This permits resistance welding without the need for the aforementioned by-pass circuit.
③ Proper Welding RegionProper Welding Conditions for Spot Welding are as Follows :
Example of Current Application By By-pass Circuit
Supporting Electrode
(NIPPON STEEL &SUMITOMO METAL Patented)
Conductor
VIBLESS
(ℓ = 30 mm)Interval Invariable
(Seq
uent
ial
Op
erat
ion)
Mai
n E
lect
rod
e
Resin
Joining Material
Electrode
Hand Vice
Weld Spot
20 R
(Cu)
Supporting Electrode SystemWeld Spot SystemBy-pass Jig System
Metal Particles
Steel Sheet
Steel Sheet
Steel Sheet
Steel Sheet
Resin Layer
Resin Layer
Metal Particles
2 4 6 8 10 12 14 16 18 20 22
8
14
20
8
14
20
8
14
20
VIB
LES
Sto
VIB
LES
SV
IBLE
SS
to
Col
d-r
olle
d S
heet
Col
d-r
olle
d S
heet
to C
old
-rol
led
She
et
Test Pieces to be Welded
Welding Current (kA)
Wel
din
g Ti
me
( ∞)
8 9
❺ Arc Welding
5. Properties of VIBLESS
In arc-welding of VIBLESS to ordinary steel sheet, arrange the ordinary steel sheet in the lower position. (Photo①)When arc-welding VIBLESS to VIBLESS, heat penetration into the resin layer of the lower VIBLESS would cause the resin to gasify and erupt out of the joint, resulting in arc instability. It is recommended, therefore, that arc-welding be performed under low heat-input conditions to avoid such heat penetration. (Photo②)
① ②
❻ Control of Aged Lowering of Screw Torque Loss Due to Addition of Metallic Fillers
1. Test Method • Size of test piece: 1.6 mm(0.8 + 0.8) × 30 × 300 mm• Drilling: Drilling in a diameter of 6.5 mm and at a pitch of 50 mm → A set of M6 bolt, VIBLESS, washer and nut• Initial fastening force: Set at 100 kgf・cm (9.8 N・m)• Measurement of initial torque in the case of incremental fastening at room temperature after retaining in the prescribed time at 80 °C
2. Results • Because of the addition of metallic fillers, maximum torque loss is about 20 % even at 80 °C. Further, torque loss occurs within several hours after the initial addition of filler but remains nearly constant afterwards.
0.1 100010
50
100110
10 100
VIBLESS with Addition of Metallic Fillers
VIBLESS without Addition of Metallic Fillers
Time (hr)
Bol
t Fa
sten
ing
Torq
ue
(kg
f ・cm
)
Aged Characteristics of Bolt Fastening Torque in VIBLESS (80°C� After Lapse of Time)
6. Heat Resistance
0.2
100 200
0.4
0.6
0.8
1.0
1.2
1.4
1.6
1.8
2.0
100 ˚C80 ˚C60 ˚C
• Measurement of adhesive strength at room temperature
Time (hr)
Ad
hesi
ve S
tren
gth
Rat
io
Bef
ore
and
Aft
er H
eatin
g
Change in Adhesive Strength Due to Heating(In the case of fixing the temperature level and then changing the lapse of time)
1.0
0160 180 200 220 240
Shear Adhesive Strength
T-peel Strength
Temperature ( ˚C) (30-minute Heating at Each Temperature Level)
Ad
hesi
ve S
tren
gth
Rat
io
Bef
ore
and
Aft
er H
eatin
g
Change in Adhesive Strength Due to High-temperature Heating(In the case of fixing the lapse of time and then changing the temperature level)
7. Durability
Shown below are the results of a study concerning VIBLESS quality changes in various conceivable service environments. They show that VIBLESS undergoes hardly any deterioration in performance, providing excellent quality assurance in application.(Resin : thermo-setting type for high-temperature application)
4
0 200 400 600 800 1000
2
8
6
4
10-1 at 140°C
Heat-resistant Durability Test
Heating Time (hr)
Loss
Fac
tor
( η m
ax)
300
mm
Electromagnet
535 g Steel Ball
Test Piece (0.8 + 0.8) × 200 × 200
Rubber (MV - 45) 15 mm
Foam Polystyrene
Results: No Peel andCrack at -30 °C × 5 hrs.
Low-temperature Resistance Test
4
6
0 200 400 600 800 1000 1200
2
8
6
10-1 at 43°C (Water Sprinkling 12 min./hr)
Weathering Test
Exposure Time (hr)
Loss
Fac
tor
( η m
ax) Temperature : 150°C
Oil : Mineral Oil4
6
0 10 15 20 30 35 40 1000
2
8
6
10-1
Oil Resistance Test
Immersion Time (min)
Loss
Fac
tor
( η m
ax)
Immersion Into City Water (20 ~ 25°C)
4
6
0 20 40 60 80 100 120 135
8
2
6
4
10-1
Water Resistance Test
Immersion Days (day)
Loss
Fac
tor
( η m
ax)
4
6
0 10
8
2
6
10-1
1 Cycle =
-30°C × 7.5 hr+
R.T. × 0.5 hr+
90°C × 15.5 hr+
R.T. × 0.5 hr
Thermal Shock Resistance Test
Number of Cycles
Loss
Fac
tor
( η m
ax)
4
6
0 20
8
2
6
4
10-1
240°C
High-temperature Durability Test
Heating Time (min)
Loss
Fac
tor
( η m
ax)
4
6
0 440
8
2
6
10-1 at 40°C × 50 pphm
Ozone Resistance Test
Exposure Time (hr)
Loss
Fac
tor
( η m
ax)
10 11
8. Typical Applications
Classification Application Examples
AutomobilesEngine oil pan (Diesel, Gasoline), Mission oil pan, Engine cover, Wheelhouse, Dash panel, Floor panel, Room partition, Seat-back center, Door panel, Roofing, Brake part, Horn parts, Belt cover, Cross members
Electrical Machines
Washing machine body, Dryer drum, Fan-heater housing, Speaker frame, Cover and other components of acoustic equipment (Video cassette recorder, Compact disc player, etc.), Printer components, Housing for hot-water supply pot, Air-conditioner components, Components of antenna for BS broadcasting, Copy machine components, Motor cover, Motor fan cover, Motor frame, Switchbox
Building Materials
and Others
Roofing, Floor, Staircase, Shutter, Curtain rail, Shoot, Hopper and cover for industrial machinery, Various types of noise-prevention walls, Steel furniture, Air conditioner duct, Dispensing chutes of vending machines, Ship wall
Motor Cover for Mowing Machine
Chain Housing for Motorcycle
Automotive Engine Covers
Automotive Wheelhouse
Automotive Seat-back Center
Automotive Oil Pans
Speaker Frame
Curtain Rails
Cover for Video Cassette Recorder
Washing Machine Body
Fan Heater Housing
Roofing
Roofing
Scrap ShootComponent Shoot
Ship Wall
12 13
❶ Example of Packaging
❷ Example of Marking on Packaging Label
(The form of packaging differs according to the distance and method of transport.)
9. Packaging and Markings 10. Reference Information on Usage
No Steel Cover on Coil Inside and OutsideExample of V.C.I Paper or Film Packaging[Coil]
Label
Steel Cover
Inside Angle
V.C.I. Paper
Outer Ring
Hoop
A
BC
VEEX : J S M NDD
② Division of Resins
③ Symbol of Temper Grade
① Classified Symbols
Item No. Item Markings
VIBLESSCommodity Name
Specifications
Dimensions
⑥ Symbol of Oiling
④ Symbol of Surface Finish (Upper and Lower Steel Sheets)
Division General WeldableRoom-
temperature UseIntermediate-
temperature UseHigh-
temperature Use
J
Q
K
G
I
E
H : Heavy Oiling L : Light Oiling N : Normal Oiling X : Nonoiling
⑤ Symbol of Surface Treatment
M : Nontreatment QM : High-functional Chromate-free Treatment QB : Chromate-free Phosphate Treatment
Dimensions for Ordering Thickness (Upper Sheet Thickness + Lower Sheet Thickness) × Width × Length (C. in the Case of Coil) Note : The Thickness of the Intermediate Resin Layer is not Included in the Thickness for Ordering.
A
B
C
VIBLESS — a composite material composed of steel sheet and visco-elastic resin — offers characteristics different from those of ordinary steel sheets. Special care should be given to the following points:
❶ Shearing/Cutting (1) Shearing and blanking: Adjust the clearance to half that for ordinary steel sheet. Adoption of clearances similar to that of ordinary steel sheet is likely to cause large burring.(2) For fusion-cutting, select the methods characterized by a small beam diameter, such as laser beam cutting. In plasma cutting, slight unevenness occurs on the cut surface. Since gas cutting is likely to cause burning and evaporation of the visco-elastic resin, which would make normal cutting difficult, gas cutting should be avoided.
❷ Forming (1) Because VIBLESS is more likely to wrinkle during drawing than ordinary steel sheets, higher blanking force should be adopted (refer to 5-(2) Formability of VIBLESS). In particular, in drawing parts for which forming is difficult, the plastic flowing performance of the visco-elastic resin constitutes an important factor that makes preliminary testing essential.
(2) In bending of VIBLESS, flange bending may occur due to a difference in residual stress between the upper and lower steel sheets (refer to paragraph 5-(3) Bendability). Countermeasures against this include:
① Materials: To differentiate thickness between the upper and lower steel sheets (however, this lessens the vibration-damping effect).
② Design: To adopt a larger bending radius
③ Fabrication: To extend the die width (ten times or more the sheet thickness is desirable). V-cutting (refer to 5-(3) Bendability) and other methods can be applied. Further, since large spring back is likely to occur, there are cases where adjustment of the bending angles is required.
(3) An excessively small bending flange width results in the misalignment of the upper and lower steel sheets. Thus, sufficient flange width should be adopted.
(4) Roll-forming involves increased spring back, thus necessitating adjustment. In general, the greater the number of rolls, the better the forming finish.
(5) Punching is more advantageous than drilling. In applying either of these methods, care should be taken to avoid peeling off the visco-elastic resin layer, which is caused by hooking the upper sheet of VIBLESS during blanking. Further, punching or drilling should be done after fabrication.
❸ Joining (1) Resistance welding: The provision of a bypass circuit is required for the commercial grade (refer to paragraph 5-(5) Resistance Weldability).
(2) Arc welding: Because the resin is likely to burn and voids are likely to occur, care should be taken to adopt low heat input (refer to paragraph 5-(6) Arc Welding). There is also a method by which arc welding is performed after the visco-elastic resin has been removed by burning.
(3) Caulking: Even if the upper and lower sheets are misaligned, there should be no problem(4) Screw-fastening: Screws compatible with the upper and lower steel sheets should be used.
❹ Painting (1) For a high-temperature baking finish (180˚C or higher), the thermosetting resin type is essential, so please consult us prior to the application.
(2) The application of usual degreasing or chemical treatments poses no problem.
❺ Galvanizing at Fabricators’ Shop
(1) Electrogalvanizing: As for the commercial grade, the electric current should be passed through both surfaces.(2) Hot-dip galvanizing: It is recommended not to apply hot-dip galvanizing, because it changes the quality of the
visco-elastic resin.
❻ Treatment at Fabricators’ Shops
(1) Because VIBLESS is manufactured by bonding two steel sheets together, its rigidity is lower than that of an ordinary steel sheet having the same thickness. Accordingly, care should be exercised when
VIBLESS is used for members requiring structural strength.(2) Because the adhesive strength of visco-elastic resin is less than 1/10 that of ordinary steel sheets,
applications where force is applied in the direction that would cause delamination of steel sheets should be avoided.
(3) The properties of VIBLESS depend on the resin applied, so please consult us prior to the application planning.
14 15
VIBLESS Production Line Methods for Measuring Vibration-damping Capacity
Methods for Measuring Adhesive Strength
References
Layout of Coil Production Line Methods for Measuring Vibration-damping Capacity, Loss Factor η
No.1 Payoff Reel
Tension Reel
No.2 Payoff Reel
Resin Drying Furnace
Drying Furnace
No.1 Entry Loop Car
No. 2 Entry Loop Car
Steel Sheet Preheating Furnace
Drying FurnaceCooling Section
Exit Loop Car
Pressure-bonding Roll
Resin Coating Unit
Pretreating Unit
● Nippon Steel & Sumitomo Metal operates a VIBLESS production line exclusively for cut-sheet manufacture, in addition to the coil production line.
Measuring Method Principle of Measurement
Center-support Stationary Excitation Method
(Refer to the Figure Below)
The loss factor is obtainable from the half power band width (3 dB) of the frequency-response curve of the vibration acceleration divided by the excitation force.
η=f2 - f1
f0
3 dB
A/F
f1 f0 f2
Center-support Stationary Excitation Method
F
A
F : Excitation ForceA : Acceleration
Thermostat
Test Piece
Exciter
Test Piece Width : 30 mm, Length : 300 mm
Impedance Head
Computers
Frequency Response Curve
FFTAnalyzer
Amplifier
Amplifier
Amplifier
❶ Shear Adhesive Strength
Room temperatureShear adhesive strength is obtained by calculating strength per 1 cm2 of area.
Test Piece Width : 25 mm
Weld Zone Length 10 mm
Steel Sheets
Resin
Tensile Speed5~50 (mm/min)
10 20 30 40
Displacement (mm)
T-p
eel l
oad
(kg
f)
20
0
40
60Test Piece Width : 25 mm
Room Temperature
Tensile Speed200 (mm/min)
10 20Displacement (mm)
T-p
eel L
oad
(kgf
)
20
0
40
60
T-peel Strength
30 40
❷ T-peel Strength
16 17
MEMO