Rotation Bending Test

1. Description of the Test Method

The test rig allows the ralisation of operating stability tests of wheels according to the guidelines for tests of passenger car and lorry wheel. The test method is carried out with a non-moving wheel fixed to the rim.

This test method allows short test times since the development of cracks in the tested wheel is observed during the test.

With the support of a computer system a reliable, user-friendly realisation of the test is granted. A bending bar in the middle of the machine initiates the bending momentum through a rotating mass at the head of the imbalance cause. The bending bar with assembled flange has the standardised length of 760 mm.

2. Mechanics

All common punch rings (10" - 24") can be put up.

3. Most Modern Measuring Electronics

Analogous measuring electronics enclose 2 channels each for measuring the bending momentum and the deviation of the bending bar. The bending momentum is measured by special extension measuring stripes full bridge / assembled coatings on the bending bar.

The taken measurements are fed into the computer which makes a geometrical calculation. These values show the real value for the regulation of the bending momentum. The deviation of the bending bar is measured by non-touching path monitoring devices.

The increasing deviation is a signal for a beginning crack in the wheel and is therefore used as an important criterion for turning off the test machine.

The taken signals of each path monitoring device are edited by measuring intensifiers and transferred to the computer. The computer adds up the signals geometrically so that these values can be used for controlling the deviation.

4. User Surface

The following specifications are entered via an input menu:

Number of load alternations rated value bending momentum or revolution per minute limit proportional increasing distance (criterion for turning off) maximum revolutions per minute (criterion for turning off ) maximum bending momentum (criterion for turning off ) information about test specimen

All specifications are variable during the phase of testing.

5. Technical Data

Type PN05, rated bending momentum 12 kNm, linearity deviation during static calibration <0,5% v. E., electric connection 3-/N 3 80/220V 50-60Hz/10,0 KW, driving force servo motor 6,2 KW, test revolutions p. m. while regulating momenta n = 400 - 3500 min-1, test revolutions p .m while regulating revolutions n = 0 - 3500 min-1, wheel sizes10“ -25“, rim range 3,5“ - 17“, length of bending bar 725 mm, height of flange 40 mm, bending bar complete with flange 760 mm, diameter of worktop approx. 2000 x 2000 mm, height of test rig 1800 mm, weight approx. 3.500 Kg

Prüflabor Nord GmbH

Rotation Bending Test