Non-ferrous metal rod variable-frequency induction gradient heating device and heating method

Abstract

The invention relates to a non-ferrous metal rod variable-frequency induction gradient heating device and heating method. The device is characterized in that a variable-frequency power supply controlcabinet is powered by a variable-frequency power supply, a variable-frequency induction coil is controlled by the variable-frequency power supply control cabinet, the variable-frequency induction coilis divided into three sections of coils, the three sections of the coils refer to an A-section induction coil, a B-section induction coil and a C-section induction coil, a metal rod enters a gradientheating furnace, the induction coils which are non-uniformly wound in the furnace body are used for inputting different energy to different parts of the metal rod, so that the heated metal rod is lowin head temperature, and the temperature is gradually increased towards the tail part, therefore in the extrusion forming process of the metal rod with the temperature gradient in an extruding machine, when the middle rear end of the metal rod is extruded, the temperature reduced by the heat dissipation of the metal rod is equal to the temperature increased through the temperature gradient at therear end of the metal rod, the temperature of each section entering a die is the same, so that the temperature of the extruded metal material is ensured to be consistent, and the quality of the finished metal material is ensured; and due to the temperature gradient, the temperature reduced by heat dissipation can be made up, the rate of finished products is improved, and the production efficiencyis improved.

Description

technical field [0001] The invention belongs to the technical field of metal processing, and in particular relates to a metal bar frequency conversion induction gradient heating device and a heating method. Background technique [0002] At present, the equipment used for heating metal rods before extrusion is mainly gas heating furnace and power frequency heating furnace. The temperature of the head and tail of the metal rod heated by the gas heating furnace is consistent, and there is no temperature gradient. During the extrusion process, due to the friction and heat of the extruder, the temperature of the metal rod gradually increases, and the temperature of the metal rod entering the mold rises, and the extruded aluminum profile The temperature gradually increases, resulting in changes in the mechanical properties and dimensions of aluminum profile products, affecting product quality and reducing the yield. Most of the industrial frequency heating furnaces do not have th...

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Problems solved by technology

The temperature of the head and tail of the metal rod heated by the gas heating furnace is consistent, and there is no temperature gradient. During the extrusion process, due to the friction and heat of the extruder, the temperature of the metal rod gradually increases, and the temperature of the metal rod entering the mold rises, and the extruded aluminum profile The temperature gradually rises, causing changes in the mechanical properties and dimensions of aluminum profile products, affecting product quality and reducing the yield

Most of the power frequency heating furnaces do not have gradient heating function, and very few parts can be heated by gradient, but the equipment structure is complicated, the cost is high, and the energy consumption is high

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