Device for measuring melt heat history curve under action of pulse magnetic liquid level oscillation

Abstract

The invention relates to a device for measuring a melt heat history curve under action of pulse magnetic liquid level oscillation, and belongs to the technical field of material machining. The device is mainly composed of a pulse power supply, a mosquito-repellent incense type induction coil, an electric heating wire, a lifting rod, a ceramic tube and a plug, wherein the electric heating wire is connected with a 220V alternating current through the plug, the mosquito-repellent incense type induction coil is connected with the pulse power supply, and a casting mold containing a metal block is placed on the lifting rod. Firstly, the electric heating wire heats to melt the metal block, then, the lifting rod ascends, the casting mold is close to the mosquito-repellent incense type induction coil, the mosquito-repellent incense type induction coil exerts pulse magnetic liquid level oscillation processing on the metal melt, a thermoelectric coupler is inserted into the melt and is fixed, and the melt heat history curve is measured. Compared with a traditional temperature measuring method, the casting process is removed, the melt heat history curve can be more stably and accurately measured, and the reliable temperature data are provided for obtaining a pulse magnetic liquid level oscillation refined metal solidification structure.

Description

technical field [0001] The invention belongs to the technical field of material processing, and in particular relates to a device for measuring the thermal history curve of a melt under the action of pulse magneto-induced liquid surface oscillation. technical background [0002] Controlling the solidification process and solidification structure of metal materials has always been the focus of research by material workers, and grain refinement can significantly improve the performance of castings, and is one of the most effective ways to improve the solidification structure of metals. In the existing research, there are two main methods for refining the solidification structure of metals: one is physical refinement methods, such as electromagnetic stirring, low temperature casting, mechanical vibration, ultrasonic refinement, etc.; the other is chemical refinement methods, such as adding Growth inhibitors and nucleating agents, etc. Among them, the physical field processing ...

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Problems solved by technology

[0004] In order to further explore the internal mechanism of this method, it is of great scientific significance to accurately measure the melt temperature curve under the action of this method, but in the specific implementation process of the device in this patent, it is necessary to first melt the metal block through a resistance furnace and keep it warm for a period of time , and then pour the molten metal into the mold, and the process of taking the molten metal from the resistance furnace to pouring has many human factors. In this process, the temperature of the molten metal has decreased when it is poured into the mold due to a large amount of heat dissipation; on the other hand, the pouring method (gate position, height and pouring speed, etc.) It is also difficult to keep consistent

Due to the rapid cooling rate of the molten metal in the high temperature section, these two unfavorable factors lead to a large difference in the actual pouring temperature in different experiments, and the cooling process experienced by the molten metal will also be different, which will eventually affect the actual solidification structure.

In addition, the traditional temperature measurement method mainly takes the following steps: the thermocouple is inserted into the melt after the pouring is completed, and when the molten metal is poured into the mold with a lower temperature, due to the chilling effect of the mold, the mold wall will The rapid formation of a solidified shell, and the insertion of a relatively low temperature thermocouple will also have a certain chilling effect on the melt. These factors will also cause a large error in the measured temperature

To sum up, on the one hand, the error of the temperature curve measured by the traditional method is large, and it is difficult to obtain key information

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