Device and acquisition method for ultrasonically measuring spheroidization rate of spheroidal graphite cast iron

Abstract

The invention relates to a device and an acquisition method for ultrasonically measuring the spheroidization rate of spheroidal graphite cast iron, belonging to the fields of casting and metallurgy. The device and the acquisition method are used for solving the problems that the 100% measurement and the nondestructive detection cannot be realized while the spheroidization rate of the spheroidal graphite cast iron is measured by utilizing a metallographic phase method. The device comprises a linear displacement sensor, an ultrasonic wave receiving piezoelectric crystal plate, an ultrasonic wave emitting piezoelectric crystal plate, an arbitrary waveform generator, a digital oscilloscope and a computer, wherein the ultrasonic wave receiving piezoelectric crystal plate and the ultrasonic wave emitting piezoelectric crystal plate are respectively arranged on two opposite sides of a to-be-measured spheroidal graphite cast iron part, and the linear displacement sensor is clamped at one side, provided with the ultrasonic wave receiving piezoelectric crystal plate, of the to-be-measured cast iron part; the computer automatically monitors and displays the propagation time of an ultrasonic wave in the spheroidal graphite cast iron and the thickness of a spheroidal graphite cast iron part in the propagation direction of the ultrasonic wave and calculates the propagation speed of the ultrasonic wave in the spheroidal graphite cast iron part, so as to acquire the spheroidization rate of the to-be-measured spheroidal graphite cast iron part.

Description

technical field [0001] The invention relates to an ultrasonic measuring device and an acquisition method for nodularity rate of nodular cast iron, which belong to the field of casting and metallurgy. Background technique [0002] Ductile iron has the advantages of higher strength, better elongation and heat resistance than gray cast iron, and has been widely used in the machinery industry in recent years. One of the important assessment indicators of the casting quality of ductile iron is its spheroidization rate. At present, there are many methods to measure the nodularity rate of ductile iron, such as metallographic method, audio method, thermal analysis method and so on. Among them, the metallographic method is the most commonly used test method, and its process includes: cutting samples from the test rod or casting body, sample polishing, corrosion, microscope observation, etc. The workload is large, and only sampling testing can be carried out, which is not suitable f...

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Problems solved by technology

[0003] The purpose of the present invention is to solve the problem that the nodularity rate of nodular cast iron by metallographic method cannot be 100% detected and non-destructive testing cannot be achieved, and an ultrasonic measurement device and method for obtaining nodularity rate of nodular cast iron are provided

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