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The development and quality monitoring of high-load spring components of vehicles like springs and stabiliser bars demand resonance tests under conditions that are as realistic as possible. The main quality features of steel springs are fatigue strength and relaxation behaviour under load and environmental conditions that are as realistic as possible. IABG test machines provide excellent contemporary solutions for implementation in research, development and quality control to ensure the fatigue strength of spring elements in the field.
Resonance test bench for springs
Resonance machine for testing the fatigue strength of resilient components in normal laboratory atmosphere.
Technical specification
- Components to be tested: Springs of all kinds with parallel and circular deformation without corrosion impact
- Maximum load allowed for each of the two test positions: Fmax = 40kN
- Number of springs that can be tested simultaneously: 2, 4, … limited by Fmax
- Stroke (path-controlled): S = 10 to 250 mm
- Maximum spring length: Lo = 600 mm
- Test frequency: fo = 0.47 x sqrt (n x R) Hz
n = number of springs to be tested simultaneously
R = spring constant N/mm
fo = 2 to 25 Hz
- Measurement of spring force and spring length
- Low noise and low vibration (no special foundations required)
- Weight approx. 2.4 t
- Machine dimensions: L = 1800 mm, W = 2000 mm, H = 2500 mm (additional floor space required for: control console, control cabinet and hydraulic oil supply)
- Hydraulic oil station
Advantages compared with other spring testing machines
- Low power consumption (approx. 1 to 3 kW depending on spring type and number of springs) Easy to operate
- Long service life (up to 30,000 operating hours before bearing overhaul is necessary)
- Low maintenance
- Universal application
- Tests with variable amplitudes (collective) possible.
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Resonance test bench for springs
Resonance testing machine fatigue strength tests on spring components under saltwater corrosion or in normal laboratory atmosphere.
Technical specification
- Components to be tested: Springs of all kinds with parallel and circular deformation with and without corrosion impact.
- Maximum load allowed for each of the two test positions: Fmax = 40 kN
- Number of springs that can be tested simultaneously: 2, 4, … limited by Fmax
- Stroke (path-controlled): S = 10 to 300 mm
- Maximum spring length: Lo = 680 mm
- Test frequency: fo = 0.23 ... 0.33 x sqrt (n x R) [Hz]
n = number of springs to be tested simultaneously
R = spring constant [N/mm]
fo = 1.8 to 15 Hz
- Measurement of spring force and compression (recording of spring characteristic and relaxation).
- Saltwater vessel (250 l) with individually programmable spray intervals and heating up to 40°C.
- Low noise and no outgoing vibrations (no special foundations required).
- Weight approx. 2.4 t
- Machine dimensions: L = 1800 mm, W = 2000 mm, H = 2500 mm (additional floor space required for: control console, corrosion unit, water treatment unit and hydraulic oil supply)
Advantages compared with other spring test benches
- Low power consumption (approx. 1 to 3 kW)
- Easy to operate
- Long service life
- Low maintenance costs
- Universal application (also for tests without corrosion)
- Tests with variable amplitudes (collective) possible.
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Resonance test bench for large coil springs
Resonance test bench for testing large spring components (or a large number of small components).
Technical specification
- Components to be tested: springs of all kinds with parallel deformation
- Type of load: constant or variable amplitudes (collective loading)
- Maximum load allowed for each of the two test positions: Fmax = 200 kN
- Number of springs that can be tested simultaneously: limited by Fmax
- Stroke (path-controlled): S = 10 to 400 mm
- Maximum spring length: Lo = 1000 mm
- Test frequency: fo = 0.19 ... 0.28 sqrt (n x R) [Hz]
n = number of springs to be tested simultaneously
R = spring constant [N/mm]
fo = 2 to 20 Hz
- Static determination of load and spring length (recording of spring characteristic, determination of relaxation).
- Low noise and few outgoing vibrations (no special foundations required).
- Driven by a servohydraulic torsion cylinder (M ≤ 2300 Nm)
- Hydraulic oil supply
- Weight approx. 8.5 t
- Test machine dimensions: L = 2,200 mm, W = 2,200 mm, H = 3,500 mm
Advantages compared with standard servohydraulic units
- High test frequency
- Low power consumption through resonance effect (2 to 5 kW)
- Easy to operate
- Long service life
- Low maintenance costs
- Universal application
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Test bench for determining the fatigue strength of individual spring coils
Technical specification
- Test items: two spring coils from cylindrical car axle springs
- Clamping in the machine: between tips
- Wire diameter: d < 22 mm
- Spring diameter: Dm = 40 to 320 mm
- Test frequency:
- Low speed: f = 0.2 to 1.5 Hz
- High speed: f = 8 to 40 Hz
- Environmental conditions: normal laboratory environment or salt spray.
- Weight without control cabinet: 1,000 kg
- Dimensions without control cabinet: L = 1,200 mm, W = 1,100 mm, H = 1,600 mm
- Type of load: Wöhler or fatigue strength test
- Set-up time for one test: approx. 10 min.
- Power consumption: < 1 kW
- Properties: no outgoing vibrations, very quiet
Aim of the tests
Comparative testing of fatigue strength. The type of test described below cannot be made on complete springs, at least not cost-effectively and at short notice. In addition, coil tests of this type provide approx. 40% higher stress than in the testing of the associated springs. This permits greater mean stress variations.
Test options (selection):
- Testing of surface protection, the influence of pre-corrosion and corrosion during the test under realistic test conditions.
- Testing the influence of the test frequency on the service life under corrosion.
- Testing of the influence of the material, thermal treatment, shot blasting, surface quality and surface protection coating etc.
- Testing of the influence of mean stress (vehicle loading).
- Wöhler lines.
- Dispersion in time and frequency range
- Testing for predicting service life (damage accumulation) under collective loading.
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Valve spring test bench
- Test bench for determining the fatigue strength of valve springs
- Two test positions (left and right)
- Maximum load allowed for each of the two test positions: Fmax = 20,000 N
- Maximum mean load allowed for each of the two test positions: Fm, max = 13,000 N
- Maximum possible stroke: S = 80 mm
- Maximum set-up height: L = 250 mm
- Test frequency: = 0.6 sqrt (n x R) [Hz]
n = number of springs to be tested simultaneously
R = spring constant [N/mm]
fo = 2 to 20 Hz
- Initial stress: automatic or manual in accordance with the desired load and spring length
- Temperature regulation: Tmax = 200 °C
- Path-controlled stroke regulation (precision: ±0.02 mm)
- constant or randomly variable amplitudes (collective)
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stabiliser bar test bench
Test bench for determining the fatigue strength of stabiliser bars of cars.
Technical specification
- Test items: all kinds of stabiliser bars for passenger cars; one or two bars simultaneously
- Bar diameter: d = 10 to 42 mm
- Bar length: L ≤ 1800 mm,
- Test frequency: f = 10 to 25 Hz
- Type of load: constant and randomly variable amplitudes (collective tests), purely alternating loading (R = -1).
- Installation: Pel corresponds to 1 kW, on even floor surface
- Weight without control cabinet: 3200 kg
- Machine dimensions: L = 4500 mm, W = 1500 mm, H = 1800 mm
Advantages compared with the standard eccentric test benches
- 5 to 10 times faster.
- Short set-up times.
- Simple, fast, reliable, documentable.
- Low power consumption (approx. 2 kW).
- Collective tests possible (randomly mixed short blocks).
- Universal application, e.g. also for tests with rubber bearings and complete chassis.
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