Signal fusion detection method and signal fusion detection system of automobile wheel hub ferrite content

Abstract

The invention discloses a signal fusion detection method and a signal fusion detection system of automobile wheel hub ferrite content, and belongs to the technical field of wheel hub ferrite content detection. The signal fusion detection method is characterized in that a first detection signal obtained through respective detection of magnetic conductivity of a standard wheel hub and a wheel hub to be measured is sent to a microprocessor, simultaneously a second detection signal obtained through detection of resistance of the wheel hub to be measured and a third detection signal obtained through detection of environment temperature are sent to the microprocessor, and the microprocessor comprehensively processes the three detection signals to obtain content value of the ferrite content of the wheel hub to be measured. The detection system comprises two inductive sensors, a four-terminal method measuring resistance circuit, a temperature sensor, an analog / digital (A / D) converter, the microprocessor and a liquid crystal display (LCD) screen. The signal fusion detection method and the signal fusion detection system of the automobile wheel hub ferrite content aim at automobile hubs with cast surfaces, revise signals of the inductive sensor for detecting the ferrite content when environment is changed and graphite form in a material is changed, achieve accurate determination of the wheel hub ferrite content, and are used for detection of the automobile wheel hub ferrite content.

Description

technical field [0001] The invention relates to a detection method, in particular to a signal fusion detection method for the ferrite content of an automobile hub. The present invention also relates to a detection system for implementing the above detection method. Background technique [0002] The wheel hub is one of the important parts of the automobile, which requires excellent toughness and sufficient strength, and is often produced with ferritic ductile iron. Due to the fluctuating characteristics of the casting quality, the ferrite content in the hub material is unstable. The traditional detection method of the ferrite content in the wheel by the manufacturer is sampling: take a few from each batch of wheels, cut and sample, and then conduct metallographic observation and analysis. This method has two disadvantages. One is that it is a destructive test, which leads to an increase in production costs; the other is that it cannot achieve 100% detection, and there is a ...

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Problems solved by technology

This method has two disadvantages, one is destructive detection, which leads to increased production costs; the other is that it cannot achieve 100% detection, and there is a phenomenon of missed detection.

Chinese patent: ZL86108323 (publication number: 86108323; public date: June 24, 1987) discloses a "quick measuring instrument for pearlite of cast ductile iron crankshaft", which uses the principle of electromagnetic induction to convert the magnetic permeability of the casting to Electrical signals can achieve the purpose of quickly and non-destructively directly displaying the pearlite content in the material of the tested piece, but this method does not rule out the interference of the graphite form variation in the ductile iron casting and the ambient temperature change on the detection signal

At present, the ferrite content detector on the market uses a written test probe to detect the ferrite content of the welding part of the weldment. There are certain requirements for the surface roughness of the detection part, and it is difficult to use it on the rough surface of the wheel hub casting.

Both of the above two detection devices cannot meet the rapid detection of ferrite content in as-cast automobile hubs

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