Microsample sampling system based on sinker EDM (Electric Discharge Machining) principle

Abstract

The invention provides a microsample sampling system based on a sinker EDM (Electric Discharge Machining) principle. The microsample sampling system comprises a sinker EDM power supply, an electrode, a mechanical stroke mechanism, a single detecting unit and a singlechip control unit, wherein the sinker EDM power supply is used for providing pulse voltage for the electrode, the mechanical stroke mechanism is used for controlling the movement of the electrode, the signal detecting unit comprises a current signal detecting module, a voltage signal detecting module and a high-frequency signal detecting module, the singlechip control unit comprises a communication module and a driving module of a stepping motor, and the signals detected by the signal detecting unit are input into the singlechip control unit to be processed. The microsample sampling system in the invention can be used for cutting off a microsample block from in-service equipment by using a sinker EDM technology; meanwhile, the equipment is damaged slightly, the mechanical property of the cut sample is not changed, and a surface heat affected layer is less than 10 microns.

Description

technical field [0001] The invention relates to a system capable of digging tiny metal samples from in-service equipment. The system utilizes the principle of electric spark forming, and can dig thin samples with a thickness of 1mm for small punch tests, and at the same time, do the equipment itself To micro damage, the surface heat-affected layer is less than 10 microns. Background technique [0002] There are a large number of pressure vessels and pipelines in service in chemical, petrochemical, thermal power, nuclear power and other industries. For these equipment, due to long-term service under special working conditions, the performance of materials will change. It is necessary to evaluate the safety of these equipment and think about it. To predict its remaining life, it is necessary to obtain its chemical composition, metallographic structure and mechanical properties (such as yield strength, tensile strength, elongation, etc.) more accurately. This requires taking a...

AI Technical Summary

Problems solved by technology

The small punch test technology has developed very maturely, and my country is also developing relevant national standards. However, the small disc samples used in the small punch test research are all processed by machine tools, and cannot be directly sampled from in-service equipment.

Canadian Mercaldi published a patent on the material surface sampling device in 1989, but the device uses a high-speed rotating hemispherical cutter on its head to cut a sample from the material, but leaves a hemisphere on the device Shaped pit, this sampling method will cause great damage to the equipment and the thickness is uncontrollable

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