Heico & heico-lock_eng_09_17_2012

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© 2012 HEICO Unternehmensgruppe

HEICO

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HEICO group of companies

Th. Heimann Holding GmbH & Co. KG

HeicoBefestigungstechnik GmbH

HeicoUmformtechnik GmbH

HeicoInternational GmbH

Heico France S.A.R.L.France

Heico Fasteners UK, LtdUK

Heico Fasteners S.A.Spain

Heico Fasteners 2 ESCzech Republic

Heico Fasteners Ltd,USA

Heico Fasteners ChinaChina

Heico Schweiz AG,Switzerland

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HEICO Umformtechnik

HEICO France, F

HEICO 2ES, CZ

HEICO Fasteners S.A., E

HEICO Fasteners, China

HEICO Fasteners, UK

HEICO Fasteners, USA

HEICO Befestigungstechnik

HEICO worldwide

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Precision in detail

Cold Formed Parts are manufactured in production quantities from Ø 3 to 16 and up to 100 mm long.

The following products are produced:

Solid parts Semi-tubular parts Hollow parts Threaded parts Shoulder rivets Ball studs Metal / Plastic parts

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Further services packing to KLT or cardboard

packaging

camera sorting

Inhouse

Annealing plant stress relief annealing recrystallisation annealing

production and technology

Electroplating laundering facility

Nickel baths Brass baths Copper baths Zinc baths

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Surface treatments Zinc flake coatings

Delta Seal / Delta Protect Dacromet

Zinc-nickel Zinc-iron Phosphating special surfaces upon request

Heat treatments annealing carburizing tempering carbonitriding inductive hardening

production and technology

Further treatments camera sorting thread coatings

…together with certified…

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Böhme & Weihs CAQ system

CNC measuring tools

contours testing equipment

hardness testing equipment

Colorimeter

metallographical researches

project tracking tools (APQP)

Junker vibration test machines

Video measuring system (Mitutoyo)

Finite Elements simulations

Quality for the most demanding applications

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Certifications

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References

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HEICO-LOCK wedge lock washersHEICO-LOCK wedge lock washers

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HEICO-LOCK wedge lock washers

The HEICO-LOCK WEDGE LOCK WASHERS consists of a pair of

washers with a wedge-locking action, which is a unique method

that uses tension instead of friction. The key is the difference in

angels. Since the cam angle is larger than the thread pitch, the

pair of washers expand more than the corresponding pitch of the

thread.

HEICO-LOCK washers positively lock the fastener in a joint which is

subjected to extreme vibration or dynamic loads.

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• HEICO-LOCK wedge lock washers offer high quality, high value bolting system

• for demanding bolted fastening applications • a proven fastening system, working at low and high preload levels • a bolt securing system providing exceptional resistance to vibration loosening and dynamic loads – safe in both dry and lubricated conditions.

• Consistent reusability without loss of function and quality

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• Ease of assembly and disassembly (already pre-assembled pair of washers)

• Working with structual grade and high tensile bolts and nuts (8.8, 10.9, 12.9)

• readily available in steel and stainless steel – other materials available on request

• available in two versions – standard and enlarged outside diameter

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General Bolt Theory

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Why nuts and bolts are used

Nuts and bolts have great holding power and allow rapid assembly and

disassembly

Relatively low torque can lead to high clamping force which can firmly

hold assemblies together

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Two Major Reasons for Failure

Self loosening due to dynamic or vibrating loads improper preloading

Resulting in…• Loss of Clamp Load• Unwanted Movement in Joint• Eventual Bolt Failure

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Limitations of Friction Based Fasteners

• Joints loosen due to dynamic or vibrating loads

• Advantages of lubrication not utilized

• Difficult to achieve adequate or accurate clamping force

• Often time consuming to assemble (increased costs)

• Possibility of damaging bolt threads

• Typically non reusable

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Advantages of using HEICO-LOCK

• Maximum Safety and Security•

• Resists Loosening of Vibrating and Dynamic Loads

• Ease of Assembly and Disassembly

• Locking Function not Lost with Lubrication

• Controllable Preloads

• Positive Locking at Low and High Preload Levels

• No Hydrogen Embrittlement or Chromate Contamination

• No Special Tool Requirements

• Reusable

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The rise of the cams α

between HEICO-LOCK

wedge lock washers is

greater than the pitch β

of the bolt.

Tension and Geometry

α

β

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• Cams with blocking wedge effect on inner surface of the lock washer, radial teeth on

the outer surface

• Gripping and seating of radial teeth in mating surfaces when tightening

• Stress only appears inside the inner key faces

• Washers already glued in pairs (to avoid assembly errors)

Concept of HEICO-LOCK wedge lock washers

key faces on inner surface radial teeth on

outer surface

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2. Angle differnce: α > β

• The rise of the cams α between HEICO-LOCK wedge lock washers is greater than the pitch β of the bolt.

• The elongation of the thickness of HEICO-LOCK wedge lock washers is larger than the potential movement of the the bolt along the pitch. The lock washer prevents the bolt/nut from loosening due to vibration and the bolt/nut is locked safely in place.

α

β

HHEICO

HMaterial

1. Hardness dfference: HHEICO > HMaterial

• The hardness of the Heico-Lock washer should exceed the hardness of the mating surfaces and is higher than structural grade and high tensile bolts and nuts (8.8, 10.9 an 12.9).

• Radial teeth/ridges on the outside of the washer grip into and seat the mating surface in the tightening process.


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4. Preload difference: Fdyn > Fstat

• Loosening the bolt causes the pair of HEICO-LOCK wedge lock washers to expand. The result is an increase in the clamping force.

• The expansion of the pair or washers increases the pre-load and locks the fastener securely, even when subjected to extreme vibration and dynamic loads.

• Large O.D. HEICO-LOCK wedge lock washers are recommended for use on large/long holes (for example with flange nuts or screws), painted surfaces or soft materials, for example aluminum.

3. Friction difference: µo > µi

• The cams on the separation plane (joint face) of the individual washers of the pair show a much lower friction coefficient µ i than the friction coefficient on the radial ridges on the outside of the pair of washers µo)

• Any loosening through a dynamic load will always lead to movement

only across the face of the cams of the washers

μo

μi


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Examples of appliance of the wedge lock washers

Through bolt- secure on both sides -

Bolt secured- in stud hole -

Stud bolt secured- without glueing -

Allen head screw© secured - in sinkhole -

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HEICO-LOCK dimensions

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Drawing of HEICO-LOCK wedge lock washer (HEICO-LOCK HLS-… , standard)

3D-files also available upon request

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Drawing of HEICO-LOCK wedge lock washer (HEICO-LOCK HLB-… , large O.D. )

3D-files also available upon request

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The Junker Vibration Test

The Junker jarring test principle

The Junker vibration test

meeting DIN 65151 is an

excellent method for testing

and comparing the security of

bolted joints. In a Junker test the

bolted joint is subjected to

transverse movements while the

tension is being continuously

measured by a load cell.

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• Tighten the bolted joint at 50 % of recommended preload

• Use light lubricant with a viscosity similar to SAE 30

• Run vibration test until either total loss of preload or stop after 2,000 cycles

• Measure and collect preload, axial movement and vibration cycles

• Determine function of wedge lock washer either by total loss of preload under

2,000 cycles or measure and establish the percentage of loss of preload after

2,000 cycles

• Durability of the bolted joint is sufficient if 80 % of initial preload is retained

DIN 25201-4: 2010-03 Test Procedures

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Junker Vibration Test

• Illustration at full pre-load (18 kN)

• Every washer was tested four times in succession

• HEICO-LOCK HLS-8 red line

• HEICO-LOCK HLB-8 blue line

• The results are continuous

Junker Vibration Test (Hamburg, 2010-03-04) HEICO-LOCK M8 (narrow & broad)

blue line = HEICO-LOCK HLB-8 (M8 ; large O.D.)red line = HEICO-LOCK HLS-8 (M8 ; small)

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Junker Vibration Test

• Each washer was tested for ≥ 2.000 cycles HEICO-LOCK HLS-8

• The results are continuous the recoverability is proven

• The official test report from the university of applied sciences Cologne is available

Junker Vibration Test (Cologne, 2010-04-19) HEICO-LOCK M8 (narrow)

Test bench of university of applied sciences Cologne

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HEICO-LOCK wedge lock washers product list

…additional sizes as well as other alloys are available upon request.

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Processing machinery

Automotive

Railway

Application examples for wedge lock washers

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Wind power

Agriculture & Forestry

Miscellaneous applications

Application examples for wedge lock washers

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HEICO

Heico & heico-lock_eng_09_17_2012

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