A die-casting mold thermal fatigue testing device

Abstract

The invention discloses a device for testing thermal fatigue of a die-casting mold. The device comprises a device framework, a heating assembly, a cooling assembly, a control assembly, a positioning assembly, a sample fixing device as well as a sample thermocouple temperature-measuring device, wherein the heating assembly comprises a crucible filled with molten aluminum and a heating element is arranged outside the crucible; the cooling assembly comprises a water tank, a cooling water pipeline and a cooling gas pipeline; the positioning assembly comprises a driving mechanism arranged at the upper part of the water tank and the crucible, the driving mechanism is connected with a sample fixing device which comprises a hollow sample and the inner cavity of the sample is provided with a cooling passage. The device disclosed by the invention has the beneficial effects that: (1) since the hollow sample is adopted, the cooling water is introduced inside the sample, and after the sample is heated, gas is firstly sprayed and then a mold-release agent is sprayed, the actual work environment of the mold is fully simulated and thus the test process is more realistic and test results have reference value; and (2) by the sample thermocouple temperature-measuring device, the temperatures of the sample at different positions above the high-temperature surface are recorded so as to lay a theoretical basis for analyzing the temperature distribution and the depth of the thermal fatigue zone when the die-casting mold actually operates.

Description

technical field [0001] The invention relates to the field of metal material testing equipment, in particular to a die-casting mold thermal fatigue testing device. Background technique [0002] Thermal fatigue is the most important form of die-casting mold failure. The higher the alloy pouring temperature, the higher the surface temperature of the die-casting mold, and the more serious the thermal fatigue failure of the die-casting mold. Thermal fatigue directly affects the service life of the die and the precision and cost of die castings. Therefore, accurate prediction of the thermal fatigue life of die casting die materials is the basis for designing long-life die casting dies. At present, the commonly used methods for testing the thermal fatigue performance of die-casting molds mainly include the sheet sample method and the crack rating method (Uddeholm method). Circulating water cooling is used to evaluate the thermal fatigue performance of the mold material. The test e...

AI Technical Summary

Problems solved by technology

At present, the commonly used methods for testing the thermal fatigue performance of die-casting molds mainly include the sheet sample method and the crack rating method (Uddeholm method). Circulating water cooling is used to evaluate the thermal fatigue performance of the mold material. The test environment of these two methods is very different from the actual working environment of the die-casting mold. The test accuracy is low and the result error is large. It cannot accurately predict the thermal fatigue life of the die-casting mold material.

[0003] The Chinese patent with the notification number CN201378134Y discloses a general-purpose thermal fatigue simulation test device for manufacturing materials, which consists of a frame, a high-frequency heater, a control circuit and a cooler. Like this, the test environment does not match the actual working conditions of the die-casting mold, and the error of the test result is large; the Chinese patent with the notification number CN2859525Y discloses a thermal melting loss and thermal fatigue test device for die-casting mold materials in molten aluminum liquid state. After heating the solid rod-shaped sample with liquid, the sample is cooled by air cooling, the test environment does not match the actual working conditions of the die-casting mold, and the test results are not accurate

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