Device and method for accurately controlling local temperature of aluminum profile hot extrusion die

Abstract

The invention provides a device for accurately controlling the local temperature of an aluminum profile hot extrusion die. The device comprises a liquid nitrogen container, a low temperature control valve, a liquid nitrogen pipeline, a die cushion, the die and a temperature controller. The die is installed in the die cushion, the liquid nitrogen pipeline is connected between the liquid nitrogen container and the die cushion and used for delivering liquid nitrogen into the die cushion, and the low temperature control valve is arranged on the liquid nitrogen pipeline and controls the flow of theliquid nitrogen. A contact type thermocouple is arranged in the die, the contact type thermocouple is connected with the temperature controller through a compensating lead, and the temperature controller is electrically connected with the low temperature control valve and transmits a direct current electric control signal to the low temperature control valve. The invention further provides a method for accurately controlling the local temperature of the aluminum profile hot extrusion die. A feedback signal is provided for the low temperature liquid nitrogen control valve by directly measuringthe temperature of the die, so that the temperature of the die is accurately controlled, and the changing hysteresis quality and inconsistency of the high temperature of a profile and the temperatureof the die at an outlet of a pressing machine in the aluminum extrusion process are overcome.

Description

technical field [0001] The invention relates to the technical field of aluminum profile production equipment and technology, in particular to a device and method for accurately controlling the local temperature of an aluminum profile hot extrusion die. Background technique [0002] Aluminum profile products are extruded aluminum alloy materials by means of hot extrusion relying on a mold with a specific structural form. Because it works under the conditions of high temperature, high pressure and high friction, the working belt of the mold is often the most likely to fail due to the continuous rise of local temperature and wear, resulting in the degradation of the surface quality of the profile, the size is out of tolerance, and even the scrapping of the mold. Based on the above problems, there are mainly two existing solutions: one is to use a lower extrusion speed to reduce the accumulation of deformation heat and friction heat of the aluminum alloy during the extrusion def...

AI Technical Summary

Problems solved by technology

Because it works under the conditions of high temperature, high pressure and high friction, the working belt of the mold is often the most likely to fail due to the continuous rise of local temperature and wear, resulting in the decline of the surface quality of the profile, the size is out of tolerance, and even the scrapping of the mold.

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