Ductile iron before-furnace thermal analysis-eutectic expansion quick detection apparatus and detection method
A detection method and detection device technology are applied in the fields of metallurgy and casting, which can solve the problem of inability to subdivide the spheroidization effect of molten iron, and achieve the effects of reducing the testing cost, facilitating popularization and application, and having a simple structure.
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Embodiment 1
[0022] Thermal analysis before ductile iron furnace-eutectic expansion hyperbolic rapid detection device, its composition includes: cylindrical dry sand sampler 2, the sampler is composed of a fixed half set 16 and a movable half set flexibly connected by a pretension spring 14 17, the sampler has a vertically placed thermocouple 4 and a horizontally placed expansion rod 7, the thermocouple is used to measure the cooling curve at the thermal node of the molten iron in the sample cup, and one end of the expansion rod It is in contact with the screw 3 on the fixed half sleeve, and the other end is in contact with a measuring rod of a linear displacement sensor 9 for transferring the displacement on the thermal center diameter of the sample. The measuring rod is constrained by a spring 8 which is always in a compressed state, ensuring the tight contact connection between the screw 3, the expansion rod 7 and the measuring rod of the displacement sensor. The invention is used in th...
Embodiment 2
[0024] Thermal analysis before ductile iron furnace-eutectic expansion hyperbola rapid detection method, pour molten iron into the sample cup of the sampler, after the temperature of each part in the sample cup reaches thermal equilibrium, the part of the expansion rod in the sample cup is heated and softened, and at the hot node There is even a slight melting on the surface of the position, but the whole still has enough strength and rigidity to maintain the function of the displacement of the transfer line. The end is connected with the chilled layer and the columnar crystal region of the sample cup wall. The closer the chilled crystallization layer on the expansion rod is to the sample cup wall, the thicker it is and the stronger it is. The chilled layer on the wall of the sample cup and the chilled layer on the wall of the sample cup and the columnar crystal region are tightly covered and integrated. In the subsequent solidification process, the displacement transmitted by ...
Embodiment 3
[0029]Thermal analysis before the furnace of ductile iron described in embodiment 1 or 2-eutectic expansion hyperbolic rapid detection method:
[0030] Taking the cooling-eutectic expansion line displacement hyperbolic detection analysis of typical eutectic ductile iron as an example, the spherical molten iron is poured into the sample cup of the sampler, and the thermocouple measures the temperature of the sample in real time. At this time, the expansion rod itself is heated and expanded. produce significant displacement increments. Maximum test temperature T max After the emergence, the sand mold reaches thermal equilibrium, and then the temperature of the sample begins to drop, and the sample shrinks slightly at this time. The sample reaches the eutectic onset temperature T ES After that, the displacement increases slightly until the eutectic supercooling temperature TE low After the emergence, a large amount of eutectic graphite began to nucleate and grow rapidly, a...
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