A thermal fatigue test device for die-casting mold material specimens
A technology of die-casting molds and testing devices, which is applied in thermal analysis of materials, measuring devices, analyzing materials, etc., can solve problems such as ignoring mechanical stress, and achieve the effects of low test error, high versatility, and low energy consumption of equipment
Active Publication Date: 2020-09-25
ZHEJIANG UNIV +1
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Problems solved by technology
However, the existing thermal fatigue testing machines only consider the change of the overall temperature field, and most of them adopt the self-constrained thermal fatigue test method, which only selects the upper and lower limit temperatures during the service process of the mold for thermal cycling, ignoring the mechanical stress on the surface of the mold during operation. Although the stress can reflect the thermal fatigue failure mechanism to a certain extent, it is not very close to the real service condition
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[0038] Such as Figure 7 As shown, it is a schematic diagram of the control flow of the thermal fatigue testing machine of the present invention. When performing the thermal fatigue test, firstly open the top cover of the liquid metal collecting shell, put it into the die-casting mold test piece, and connect the cooling water pipe at the bottom. After the mechanism starts, the upper piston rises, the lower piston moves upward to the top of the branch pipe, the bottom bushing drives the side rod welded on it to rise, the lifting rod rises, the connecting rod rotates, the rotating rod is pushed to rotate, the rotating shaft rotates, and the clamping device rotates. To the horizontal direction, the surface of the specimen is facing the 3×3 nozzle array in the vertical direction. At this time, after the valve is lifted by the push rod on the upper piston extending out of the cylinder, the molten metal flows into the cylinder from the pipeline by its own gravity. The release agent...
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The invention provides a thermal fatigue test device for a die-casting die material test piece, which comprises an upper piston, a cylinder body, a cylinder body branch pipe, a spring sealing cover, alower piston, a shaft sleeve, a metal liquid recovery pipe, a clamp piece rotating system, a test piece cooling water pipeline, a test piece clamping device, a test piece, a release agent spray nozzle, a release agent pipeline, a metal liquid collecting shell, a heat-insulating material shell, a gate ejector rod, a gate, a metal liquid smelting furnace, a side rod, an open slot and a control system. The thermal fatigue test device can truly approach a thermal fatigue failure mode of a cavity surface material of a die-casting die in the actual die casting process, and can simulate the temperature field change of the die-casting die in the real die-casting process, so as to realize the test of impact corrosion and thermal fatigue of a test material in molten aluminum; the thermal fatigue test device has low energy consumption and high universality, can be used for performing test under a high-temperature working condition for a long time, and is suitable for high-frequency thermal fatigue tests.
Description
technical field [0001] The invention belongs to the technical field of fatigue performance test devices, in particular to a thermal fatigue test device for die-casting mold materials. Background technique [0002] Die casting (referred to as die casting) process is a high-efficiency, high-efficiency metal forming process with less cutting and no cutting. It is characterized in that the molten metal is pressed into the mold cavity under high speed and high pressure in a very short time. Based on the above characteristics, under the heat transfer and erosion of high-temperature molten metal, a large temperature gradient will be generated on the surface of the die-casting mold cavity, which will cause the surface stress of the cavity to be greater than the fatigue strength limit of the mold material, and eventually cracks will occur, causing the die-casting mold to heat up. fatigue failure. According to statistics, the thermal fatigue failure of aluminum alloy die-casting mold...
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IPC IPC(8): G01N25/00
CPCG01N25/00
Inventor 许忠斌梁啟森薛斌周文狄张小岩周翔宇
Owner ZHEJIANG UNIV