Repair and calibration of the ROCKWELL 500 MRA hardness tester
Our customers are a large unit in Phung Industrial Park, Dan Phuong, Hanoi - specializing in manufacturing all kinds of tubes, la, bars, V ... stainless steel. The product is manufactured with high precision forming machines. The hardness test for manufactured products is one of the very important criteria to assess the product's hardness as well as its quality.
Machine condition:
With long-term use of the hardness tester without regular maintenance, which results in rust in the force-forming shaft of the machine, the machine's inner tip fixing shaft deviates from its original position, resulting in the machine not making a trace concave on the test specimen surface. Customers typically use HRB hardness ranges in the 92.1 range and HRC hardness in the 62.1 range. But the measurement results are not accurate and the repeatability of the measurement results is not stable.
Measured with HRC sample 62.1
After grasping information from customers and testing actual machines, on 10/03/2021, HUST Vietnam's engineers conducted repair and recalibration of the hardness tester for customers. After the repair process, the instrument has measured the results on the exact hardness standards plates with stable repeatability.
Some photos during calibration repair:
Recalibration
Measure sample after calibration