Infrared detection method for break point of mold electric heating wire

Abstract

The invention discloses an infrared detection method for a break point of a mold electric heating wire, and belongs to an active infrared detection technology, in particular to a method for realizing break point detection of the mold electric heating wire by exciting with a high-voltage discharge circuit. The method is characterized in that the high-voltage discharge circuit is designed firstly, high-voltage discharge spark is generated at the break point when the high-voltage discharge circuit is communicated with the electric heating wire with the break point, and energy is released. Heat is conducted onto the surface of a corresponding mold through an electric heating wire insulating layer, the surface temperature or the change of the surface temperature field of the mold is recorded through a thermal infrared imager, and automatic identification of the break point of the electric heating wire is realized by using a thermal diffusion theory.

Description

technical field [0001] The invention relates to the technical field of non-destructive flaw detection, in particular to an infrared detection method for breakpoints of mold electric heating wires. Background technique [0002] For large-scale composite material structural parts manufacturing enterprises in the fields of energy, aerospace, rail transit, etc., the molds for producing large composite material structural parts are specially processed, not only to achieve product appearance dimensions, but more importantly, to meet product molding requirements. Due to the large-scale composite material products in the above-mentioned fields, in order to improve the production efficiency and product quality, the production process of large composite material products requires medium temperature or even high temperature molding. This process requires the heating of the mold. function can be realized. At present, a commonly used heating method is electric heating, which has high he...

AI Technical Summary

Problems solved by technology

The passive method does not require external thermal excitation, but for this application, the heating wire will no longer generate heat when it is powered on after it is disconnected, so this method is not effective

The active method can choose different thermal excitation sources according to different applications. Among them, the most mature and widely used is the pulsed infrared thermal wave technology. This method uses pulsed flash lamps as the heat source. Since the electric heating wire is also wrapped with an insulating layer, Therefore the method is invalid

Infrared ultrasonic technology using ultrasound as thermal excitation, because the breakpoints are completely separated, heat cannot be generated under ultrasonic excitation, and this method is also ineffective

Eddy current infrared technology with eddy current as excitation is also ineffective because the mold base material is not conductive

Other commonly used heat sources, such as lasers, hair dryers, light bulbs, etc., cannot be used for electric heating wire breakpoint detection

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