Rotary Bending Testing Machines

Rotating bar bending fatigue tests at various types of specimens with high measurement accuracy and comfortable operation

Rotary bending testing machines are designed for dynamic fatigue tests by Wöhler according to DIN 50113 at specimens like wire, round specimens and rods as well as appropriate components, such as camshafts. Rotary bending testing machines are used in quality and material control. 

Rotary Bending Testing Machine UBM 8

Application

The rotary bending testing machine UBM 8 serves for carrying out fatigue tests according to DIN 50113 at specimens, such as wires, round specimens and rods with bending moments up to about 50 Nm.

Features

  • Table-top device
  • Specimens are loaded by wire rope hoists, generating torsional moments at the specimen by means of an adjustable spring at a lifting system
  • High measurement accuracy: The rotary bearings of the heads are designed with very low friction in order not to falsify the applied bending moment.
  • Flexibility: The heads to bear the specimen are continuously adjustable; this way, different specimen lengths can be used.
  • Automatic testing procedure: The driven head is mounted on a roller slide. This way, the changing length of the specimen caused by bending is compensated. Moreover, the roller slide separates the specimen pieces when the specimen breaks, maintaining the fracture pattern.
  • The machine stops automatically in case of specimen break, slippage, rupture detection or when reaching the preset number of stress cycles.
  • The number of revolutions continuously is adjustable between 50 and 3400 rpm, both before and during the test and is controlled actively.
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Rotary Bending Testing Machine UBM 9

Application

The rotary bending testing machine UBM 9 serves for carrying out fatigue tests according to DIN 50113 at specimens such as wires, round specimens and rods with bending moments higher than 50 Nm.

Features

  • Stand-alone device
  • Specimens are loaded by wire rope hoists, generating torsional moments at the specimen by means of an adjustable weight at a lifting system
  • Number of revolutions: continuously adjustable from 100 to 6000 rpm
  • Comfortable operation: The bending moment is continuously adjusted by a movable weight.
  • By means of the intuitively designed touch screen, all necessary test settings can be done and read. Among others, limit values for bending moment and load cycles can be set.
  • High measurement accuracy: Thanks to the collet chuck concept, the specimen is safely clamped. It guarantees that the clamping force is not loosened by vibration, preventing slippage. The loaded specimen parts do not have any contact with the clamping.
  • The changing specimen length while bending and relaxation is compensated and so that axial twisting of the specimen is prevented.
  • Safety: The heads and the rotating specimen are covered by a protective hood. The protective hood is equipped with a safety switch and can only be opened when the motor is stopped.
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