Spheroidizing annealing furnace

Abstract

The invention discloses a spheroidizing annealing furnace which is characterized by comprising an external hearth, an internal hearth, a furnace lid and a centrifugal fan, wherein the internal hearth is arranged in the external hearth; an electric heating device is arranged outside the external hearth; the centrifugal fan is mounted between the bottoms of the internal hearth and the external hearth; when the centrifugal fan operates, a forced convection loop is formed in the internal hearth, a space between the top of the internal hearth and the furnace lid, a space between walls of the internal hearth and the external hearth, and a space between the bottoms of the internal hearth and the external hearth; and the annealing furnace is provided with a nitrogen inlet, a methanol inlet, a blast inlet and an overpressure exhaust outlet. A cold heading finished wire annealed by the furnace is high in spheroidizing rate and low in decarburization rate, the strength and plastic processability of a material are greatly improved, cold heading products difficult to produce and complicated in structure can be produced and are good in quality, cracking of the products during cold heading can be avoided, and the service life of a mold is greatly prolonged.

Description

technical field [0001] The invention relates to an improved invention of a spheroidizing annealing furnace. Background technique [0002] The cold heading finished wire can be directly used to make various rod parts on the cold heading equipment. The parts have high precision and strong interchangeability, especially high production efficiency and low cost, which can greatly reduce the labor intensity of workers. It is widely used in production and production of automobile and motorcycle parts. The cold heading finished wire usually has defects such as the metallographic structure is not fine (generally the metallographic structure is 1 or 2 grades), the plastic processing performance of the material is poor, so it usually needs to be spheroidized and annealed first. However, due to the deficiencies in the design of the current spheroidizing annealing furnace, the finished wire is easy to decarburize after spheroidizing annealing, and the spheroidizing rate is not high. Wh...

AI Technical Summary

Problems solved by technology

However, due to the deficiencies in the design of the current spheroidizing annealing furnace, the finished wire is easy to decarburize after spheroidizing annealing, and the spheroidizing rate is not high. When producing difficult and complex cold heading products, the material is prone to cracking and cannot be formed. Products with complex structures, the quality of the products is not particularly ideal, and the service life of the mold will be greatly affected

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