Precise torque measurement of bolt tightening using ultrasound.
In the field of bolt tightening, when assembling important products, there may be cases where conventional torque tools cannot achieve the required torque accuracy due to factors such as friction or the shape of the bolt and joint. In such cases, measuring the elongation of the bolt or the load using ultrasonic methods is the most accurate and reliable. Moreover, it has been proven worldwide to be a cost-effective solution.
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basic information
The UK-based Nover Company’s "USM-3 (Ultrasonic Stress Gauge)" accurately measures the time it takes for an acoustic wave to travel from one end of a bolt to the other, known as the time of flight (TOF). Using material constants, the USM-3 converts this TOF into the bolt's "acoustic length," which serves as a reference for subsequent measurements. When the bolt is tightened, the TOF increases, and the USM-3 again uses material constants to eliminate the effects of stress and temperature on sound velocity, allowing for precise measurements of elongation or load. This enables precise torque management.
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The "Ultrasonic Stress Gauge USM-3" is a product of the British company Norbar. The company was established in 1942 and was the first manufacturer in the UK to produce torque wrenches for servicing the Rolls-Royce Merlin engines used in the famous British fighter plane "Spitfire" during World War II. The "Ultrasonic Stress Gauge USM-3," developed by this long-established manufacturer, is a standard product that has been improved over more than 40 years to meet the demands of various industries. It is widely used as a basic model of power tools in various industrial fields around the world.
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Company information
Our company was established on January 17, 1966, and immediately obtained the general agency rights for Firestone, one of the world's leading tire manufacturers, and has primarily engaged in the import and sale of Firestone products, with our business progressing smoothly. Since then, up to the present, we have successively entered into agency contracts with various prominent overseas manufacturers across different fields, and we are currently continuing extensive sales activities. Additionally, since 1974, we have been continuously recognized as an excellent corporation by the tax authorities.