Roller-type spheroidizing annealing production line and isothermal spheroidizing annealing method

Abstract

The invention relates to a roller-type spheroidizing annealing production line and an isothermal spheroidizing annealing method using the roller-type spheroidizing annealing production line. The roller-type spheroidizing annealing production line sequentially comprises a roller-type feeding table, a cooling device, a heating device, a roller-type discharging table and an upper computer control system, wherein the cooling device comprises a roller-type quick cooling furnace and a forced quick cooling chamber at the tail end of the roller-type quick cooling furnace; a workpiece conveying device is arranged inside the roller-type quick cooling furnace; and the workpiece conveying device has a double-layer structure and comprises an upper cold workpiece feeding device and a lower hot workpiece discharging device. The isothermal spheroidizing annealing method comprises the following steps: feeding, exchanging heat of a cold workpiece and a hot workpiece in the furnace, austenitizing the workpieces, performing isothermal treatment, cooling and outputting the workpieces, discharging and the like. The isothermal spheroidizing annealing method is wide in application, can be applied to spheroidizing annealing treatment of parts or raw materials on a large scale as well as isothermal normalizing treatment of the parts; and the roller-type spheroidizing annealing production line has the advantages of energy conservation, environment friendliness, small floor area, high production efficiency and the like.

Description

technical field [0001] The invention relates to an annular isothermal spheroidizing annealing production line and a method for using the production line to carry out isothermal spheroidizing annealing. Background technique [0002] Metal heat treatment is to heat a metal workpiece in a certain medium to a suitable temperature, and keep it at this temperature for a certain period of time, and then cool it in a different medium at different speeds, by changing the surface or internal microstructure of the metal material A process in which the structure is used to control its performance. Isothermal spheroidizing annealing is a common heat treatment process for hypereutectoid steel (such as bearing steel) raw materials (bars, wires, etc.) or parts blanks. On the one hand, it can reduce hardness, improve cutting performance, and prepare for machining. In order to obtain fine and dispersed spheroidized carbides, prepare the structure for subsequent heat treatment (quenching, tem...

AI Technical Summary

Problems solved by technology

Since all the process stages including heating, heat preservation, isothermal and cooling are carried out in the same furnace, the period from material feeding to furnace discharge is very long and the efficiency is low; in addition, the existing furnace does not have a quick cooling device, so the process cannot be realized The rapid cooling in the medium causes the precipitation and growth of carbides, thereby reducing the spheroidizing effect

[0004] Existing heat treatment equipment often cannot use the residual heat in the cooling process of the workpiece after high-temperature heat treatment. It is usually cooled with the furnace or air-cooled. Sometimes it is necessary to use a large blower to speed up the cooling.

This not only wastes most of the heat energy in vain, but also takes a part of the time for the furnace to cool the workpieces. Other workpieces need to wait for the processed workpieces to be completely cooled before adding new workpieces. The heat treatment furnace has not been utilized to the greatest extent. Inefficiencies, which lead to increased production costs

In addition, most of the heat energy is lost to the workshop, which increases the temperature of the workshop and seriously affects the working environment of workers.

[0005] Moreover, the existing heat treatment production line also generally has the disadvantages of high labor intensity, high energy consumption, multiple faults, troublesome maintenance, and inability to automatically control and operate.

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