For this type of fatigue tests we create benches with an adjustable support for positioning the part to be tested and two linear actuators, or with a linear actuator and a torsional actuator in order to allow a biaxial testing.

Load and position transducers of the actuators allow to detect stresses and create diagrams with the measurements obtained.

L'articolo Multi-axial Tests proviene da CCM Oleo.

A fatigue test, to ensure long life of the materials in question requires high frequency equipment. A fatigue test of 109 cycles requires more than 7 months with a traditional test machine of 50 Hz. The same fatigue test takes only 19 days with a fatigue test system high-frequency 600Hz.

Our machines maintain a high-fidelity waveform while running at a high frequency. Depending on the requirements, we can provide systems with static load from 5 to1000 kN and standard waveforms (sine, ramp, square) or programmable block diagram.

The material test machines are a very versatile product that allows the characterization or the fatigue test in traction, compression or traction-compression of the parts that you want to test.

The system can be supplied with environmental chambers and used to determine the effects of temperature during the fatigue test.

L'articolo Fatigue Tests of Materials proviene da CCM Oleo.

Electromechanical type driven by a direct current motor or a brushless motor and with crank connecting rod mechanism, with adjustable stroke, which transforms the rotary motion into a sinusoidal one. By means of the potentiometer, the speed transducer and load cells, data for the characterization of the shock absorber are detected.

Hydraulic type with servo-controlled actuator suitable for high-speed levels (max 3 m/sec), which detects displacement, speed and load for the characterization of the shock absorber and creates files in Windows environment with diagrams of force-displacement, force-speed, sweep, force-temperature (applying a sensor in the shock absorber). Which can be used for fatigue tests with particular waveforms programmable in block diagrams.

We can build multi-station machines and machines with tilting mechanism to simulate the working position of the shock absorber.

L'articolo Shock Absorber Testing Machines proviene da CCM Oleo.

To detect the chasse is provided a floating table which is equipped with two potentiometers allowing to detect the motion of the spring base in relation to its axis during compression. These machines can be also equipped with a lateral actuator that, by means of the floating table, detects the spring lateral flexibility.

Through data acquired is possible to perform files in Windows environment with diagrams characterizing the spring.

L'articolo Coil Spring Testing Machines proviene da CCM Oleo.

The trolleys where the leaf spring is placed are set for detecting the chord and the semi chords and they can be equipped with a transducer to detect the spring eye parallelism. It is possible to install a floating plan on the actuator to detect the planarity of the first leaf of the laminated spring. Inside the base of the machine there are automatic supports allowing the testing of the double layer laminated springs and springs with triple flexibility.

For leaf springs with exceeding height than the standard is possible to perform a Scrag procedure with self-learning to re-enter within the required parameters, which reduces the execution time.

We can supply machinery with robotized loading for production lines.

L'articolo Leaf-spring Testing Machines proviene da CCM Oleo.

Our machines to perform TORSION TESTS are characterized by a rotating actuator (vane drive) servo controlled that applies a dynamic torsion load to testing component and by means of a torque meter and rotary potentiometer allows the detection thanks to the counter-reaction control of the force and the angular displacement.

These actuators are specifically designed for the test application. All components of the actuator are dimensioned to have a long life. All rotating parts are designed to be symmetrical to the axial center to allow an internal balance of the actuator itself. These balances allow use even at high speed and the use for fatigue tests.

Bench for Static Torsion Tests

For low-speed tests, we produce torsion machines driven by a stepper motor with a gear reducer. These machines are suitable for tests of batches production of rubber-metal components, the component to be tested is blocked by sealing jaws actuated by pneumatic pistons and then subjected to torsion with the torsional torque detection over the whole range of angular displacement programmed, it’s possible also set the speed of torsion. The parts to be discarded are marked and there is also a warning light and an acoustic message.

L'articolo Torsion Tests proviene da CCM Oleo.

The test bench was done in order to be used in three different modes:

• closed circuit (motor-brake) reducer – joints, etc.
• as a motor for pumps, brakes, etc..
• as brake for all types of engines, etc.

Used in closed circuit our test bench works with power circulation: the energy is recovered from braking element, so as to require outside only the power dissipated in friction and losses of various kinds.

From the technical magazine “ORGANI DI TRASMISSIONE” (Nov. 99)

The test bench for rotary and transmission parts of the new Laboratories Center for Experimental Teaching of the Faculty of Engineering (Bovisa) was designed to be able to perform tests on transmission parts of various types (from joints to reducers, belts, chains, complete transmission) within the limits of the maximum installed capacity.

The main points of the project were therefore high flexibility of use, low power consumption (for long-term tests), the drive systems of the bench and measurement of mechanical quantities, data acquisition systems and tests management through PC are the latest generation technology

Download the PDF: rivista Organi di Trasmissione.

L'articolo Test Bench of Transmission Parts proviene da CCM Oleo.

When the component is put in real use conditions, applying a static preload or imposing a deflection, two types of tests are performed in sequence:

• from the execution of a test at low speed (static test), it detects the static diagram and from this we obtain the value of the static rigidity of the component conditions of use.
• Through dynamic tests are detected, maintaining a constant amplitude of the sinusoidal excitation by varying the frequency, the dynamic stiffness and the phase shift angle between displacement and load, which identifies the damping value of the testing component.

The detections are made using appropriate position transducers, of acceleration and load.

The operation frequency fields of this type of machines are essentially two:

• 4 – 25/40 Hz with amplitudes of excitation ± 0.05 / 2.5 mm and
• 25-500 Hz with amplitudes of excitation ± 0.025 /0.2 mm.

For special requirements, such as checking a motor support in resonance conditions, can be installed one inertial mass with variable weights which is applied a positive displacement transducer to allow detection of the excitation and the response of the resonant system consisting the inertial mass and the component under test. Other static machines for fatigue tests for vibration-damping can be made with two linear actuators or a linear actuator, and a torsional actuator so as to permit the biaxial testing (e.g. application of radial, axial or torsional load on a bushing).

L'articolo Tests on Vibration-damping or Components of Rubber proviene da CCM Oleo.

In 2010, CCM has installed a vibrating table, with a hydraulic sustentation, in a geotechnical centrifuge because it could be used to perform seismic testing.

This machine allows to simulate, on physical reduced scale models (up to 1:100), the events of an earthquake and the effects they produce.

It is possible to reproduce a structure in a miniature, such as a building, or a condition, can be also an embankment, and in this structure, inside the centrifuge, can be imposed an earthquake.

In Europe there are only 2 other seismic centrifuges, in Nantes (F) and in Cambridge (UK) (source: Italian local television “Telelombardia,” news of 16th April 2010).

In the video section of this website it’s possible to see one of these tests filmed inside the centrifuge and the reportage made at the customer.

L'articolo Seismic tests proviene da CCM Oleo.

They also allow the measurement of accelerations in the point of application, because the moving actuator incorporates an accelerometer.

Moreover, if additional accelerometers are placed on the elements under test, then it is possible to obtain a study of vibration propagation (example: test in a railway carriage).

L'articolo Shaker proviene da CCM Oleo.