Use Sinowon ultrasonic hardness tester to measure the hardness of screws

Hardness is a very important indicator of the mechanical properties of materials. Like strength, they are actually considering the relationship between the force and deformation of the material. There are many methods that can be used to test hardness, and the more commonly used ones are Brinell, Rockwell, Vickers, Leeb test methods, etc. Among them, Brinell and Rockwell test forces are large, the indentation is large, and the damage to the surface of the sample is large, while Vickers uses optical methods for measurement, which requires very professional technicians to operate, and cannot directly test large workpieces; while the ultrasonic hardness tester uses the ultrasonic contact impedance method to compare and measure the samples, which has the advantages of high accuracy, fast speed, portability, and easy operation.

Sinowon ultrasonic hardness tester is based on the principle of ultrasonic contact impedance measurement, also known as ultrasonic contact impedance method. Under uniform contact pressure, the resonant frequency of the sensor rod changes with the hardness of the test piece. The sensor rod in the probe is fixed to a large mass rigid body at one end and inlaid with diamonds at the other end. When the pressure head is pressed onto the workpiece, under the action of a fixed load, for workpieces with the same elastic modulus, the lower the hardness, the larger the contact area between the pressure head and the workpiece surface, and thus the larger the indentation size of the pressure head end of the damping sensor rod, so the smaller the vibration amplitude of this end, the higher the resonant frequency, so the hardness of the workpiece can be determined by the change of the resonant frequency. It is mainly used to measure the metal Rockwell hardness (HRC), Vickers hardness (HV), Brinell hardness (HB), and has a storage function. It is a hardness tester that does not damage the workpiece surface.

Sinowon ultrasonic hardness tester can measure the hardness of flange edge and gear root stamping parts, molds, thin plates, surface hardened teeth and gear grooves, and taper parts; as well as the hardness of shafts and thin-walled pipes and containers; the hardness of wheels and turbine rotors; the hardness of drill bit blades; the hardness of welding parts; and can cover the hardness measurement of most ferrous metals, non-ferrous metals and their alloys in industrial production.