Die provided with PLC temperature control device and used for low-pressure pouring and method

Abstract

The invention relates to a die provided with a PLC temperature control device and used for low-pressure pouring and a method. A first temperature sensor and a second temperature sensor are arranged on a second gas pipe and a fourth gas pipe respectively and stretch into the second gas pipe and the fourth gas pipe respectively, a temperature control module is arranged in a PLC, and a first electromagnetic valve and a second electromagnetic valve are arranged on the second gas pipe and the fourth gas pipe respectively and are connected with output ports of the PLC respectively. By means of the structure, the defects that in the prior art, the combination of an upper die and a lower die is not tight, the overall structure is complex, the pouring effect of the upper die and the lower die is difficult to ensure, whether the temperature of the cooling gas exceeds or not is judged through experiences to manually turn off a valve, consequently, the speed is low and efficiency is not high are overcome.

Description

technical field [0001] The invention belongs to the technical field of moulds, and in particular relates to a mold and method for low-pressure pouring with a PLC temperature control device. Background technique [0002] The low-pressure pouring enters the cavity smoothly through the gate, and the pressure is appropriately increased to maintain the gas pressure on the liquid surface in the crucible, so that the molten metal in the cavity crystallizes and solidifies under the action of higher pressure. Then the gas on the liquid surface is released pressure, so that the unsolidified molten metal in the liquid opening pipe flows back into the crucible by its own weight, and then the mold is opened and the casting is taken out. At this point, a complete low-pressure casting process is completed, but the existing air-cooling system for low-pressure casting molds often It is to add an additional air cooling system on the top of the lower mold. Such a structure will lead to a loose...

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Problems solved by technology

[0002] The low-pressure pouring enters the cavity smoothly through the gate, and the pressure is appropriately increased to maintain the gas pressure on the liquid surface in the crucible, so that the molten metal in the cavity crystallizes and solidifies under the action of higher pressure. Then the gas on the liquid surface is released pressure, so that the unsolidified molten metal in the liquid opening pipe flows back into the crucible by its own weight, and then the mold is opened and the casting is taken out. At this point, a complete low-pressure casting process is completed, but the existing air-cooling system for low-pressure casting molds often It is to add an additional air cooling system on the top of the lower mold. Such a structure will lead to a loose combination of the upper mold and the lower mold, making the overall structure complex and difficult to ensure the casting effect of the upper mold and the lower mold. In addition, the process of low-pressure casting If the temperature of the cooling gas is above the cooling temperature, the valve for delivering the cooling gas needs to be closed, but now it is used to judge whether the temperature of the cooling gas exceeds the temperature of the cooling gas to manually close the valve, which is slow and inefficient.

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