How to measure the hardness of the Cylinder?

Test samples and requirements:

1.Measured workpiece:Cylinder 2.Coating thickness 0.03mm, about φ14mm

3.Measurement requirements:Vickers hardness of chrome-plated cylinder

4.The instrument used Model: SU-320R

Current Pain Points:

1.The customer needs a hardness testing solution with precision, fast-speed and NDT. 

It is known that Rockwell hardness tester has a large indentation, and the measured product cannot be used after the testing. It is not suitable for mass nondestructive measurement or full inspection.

2.Vickers hardness tester need operators with experienced skills and low efficiency.

3.The portable Leeb hardness tester is not suitable for chrome-plated surface workpieces because the workpieces is too thin. The thickness of the workpiece must be above 50mm.

Our Sinowon Solution:

According to the current pain points of measurement, we decided to use a Rolle Ultrasonic Hardness Tester to measure the sample.

Sinowon Ultrasonic Hardness Tester SU-320R adopts 3N test force, which can fully inspect the hardness of the chrome plating on cylinder without damaging the workpiece, effectively guaranteeing the production quality of the product.

Because the single measurement time of the ultrasonic hardness tester is about 6 second per time, the efficiency is improved by 17 times compared with the desktop Rockwell hardness tester. And the indentation diameter after the ultrasonic hardness tester is 0.026mm, and the indentation diameter after the Rockwell hardness tester is 0.484mm (see picture 2 for the indentation). The ultrasonic hardness tester does not affect the subsequent assembly and use.

Picture 2. The size comparation between UCI Vickers indention and Rockwell HRC indention.

Vickers hardness tester test results (HV/0.3):

Testing time 1 2 3 4 5 Average value(HV) Repeatability(HV)
Hardness value 949HV 965HV 942HV 951HV 963HV 954HV 23HV

Note: Maximum  Value:965HV,  Minimum value: 942HV

Ultrasonic hardness tester test results(3N)

Testing time 1 2 3 4 5 Average value(HV) Repeatability(HV)
Hardness value 955 948 955 969 955 956.4 21

Note: Maximum  Value:969HV,  Minimum value: 948HV

Test conclusion:

SU-320R is able to measure the hardness of hardness of large workpieces with precision, fast-speed and NDT solution.

SU-300R ultrasonic hardness tester has simple operation and high reliability. It only needs to prepare a standard sample to calibrate the instrument, which can achieve accurate hardness measurement.

While using the ultrasonic hardness tester to improve the quality control of the enterprise, it also reduces the loss and increases the profit of the enterprise.

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If you have any need, please feel free to contact us. We look forward to the pleasure of serving you.