Automatic testing and sorting machines and special devices for the bearing industry

Hardness Tester MultiFrequency – HT MF

is an automatic testing and sorting machine for non-destructive examination of the hardness of steel balls.

The Hardness Tester is intended for the automatic non-destructive examination of the hardness of steel balls. The machine sorts out the balls on the good and the bad balls from the point of view of their hardness or material. It is used to sort the balls following the OK exit of the Ball Scanner or any other device operated by the customer.

The automatic control machines type HT MF are intended for the examination of the hardness of steel balls of diameter from range 3.0 – 6.35 mm and 9.525 – 14.600 mm. The HT MF machines for checking the balls of diameter smaller than 3.0 mm and greater than 14.600 mm and in the range 6.350 – 9.525 mm are supplied only following a special agreement with the customer.

The machines of type HT MF employ an induction method to test both the ball's surface and its material, they are equipped with several coils (normally four coils). The device uses a method of measurement of the electrical parameters of the balls as they pass through a coil, which presents a picture of the chemical and crystalographic composition of the structure of the ball’s surface. Each coil operates at a different frequency. Each coil has its own monitoring and assessment system. Through the comparison with known, previously monitored calibration balls, the automatic machine is then able to sort balls with the precision of ±2 HRC from the calibration samples.

The balls are fed through the machine in the following way: The balls are transported by means of the elevator from the level below the base plate of the HT MF into the entry hopper. From the entry hopper the balls are transported through the feeder with separator, where their movement is regulated in such a way as to ensure that they roll singly at regular intervals through the centre of up to four monitoring coils in linear series.

According to the results of the hardness check the balls are then directed to the

  • "OK"/“UNK“ (acceptable/unknown) exit or
  • "BAD" (unacceptable) exit.

The operator can set the level of exactitude of the examination if it is necessary.

From the feeder with separator the balls run through the monitoring module with four coils. Each coil has its own adjusting and testing system. The central control and monitoring unit CU TS then sorts the balls into BAD and OK/UNK. exits using the comparison of the test results with the control values (obtained previously by the monitoring of calibration balls). The OK/UNK. exit leads to the ball batcher and only in the case that the full batch of OK balls is complete and duly examined the balls are sorted as OK. In case of discrepancy (e. g. error in the number of balls etc.) the balls are sorted as ‚unknown‘ – UNK and it is possible to start the sorting process again. Balls are sorted out into the „BAD“ exit, if they were indicated as minimally unsatisfactory by one or more coils compared to the calibration samples in term of their hardness or difference of material.

From the feeder with separator the balls run through the monitoring module with four coils. Each coil has its own adjusting and testing system. The central control and monitoring unit CU TS then sorts the balls into BAD and OK/UNK. exits using the comparison of the test results with the control values (obtained previously by the monitoring of calibration balls). The OK/UNK. exit leads to the ball batcher and only in the case that the full batch of OK balls is complete and duly examined the balls are sorted as OK. In case of discrepancy (e. g. error in the number of balls etc.) the balls are sorted as ‚unknown‘ – UNK and it is possible to start the sorting process again. Balls are sorted out into the „BAD“ exit, if they were indicated as minimally unsatisfactory by one or more coils compared to the calibration samples in term of their hardness or difference of material.

  • HT MF : HT 0306 MF, HT 1014 MF

HT MF are supplied as standard with the central control unit type CU TS including a graphical display of the monitoring results. The CU TS uses touch-screen controls (functions with a finger touch on the screen). The CU TS includes as standard the possibility of a printout enabling the print of an Output Protocol (i. e. a monitoring report).

The difference between the HT MF and the HTA MF is that the HT MF is equipped with the elevator for transportation of balls from below the base plate into the entry hopper.

Note: Packaging in wooden crates is standard for overseas shipping but can be carried out on the wish of any customer.

KROB SCANNERS s.r.o., Drahkov 52, 415 01 Teplice, Czech Republic, EUROPE >>> | Version 2006 |
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