Continuous type atmosphere heat treating furnace
AssigneeChugai Ro Co., Ltd.
InventorsFumihiko Hattori, Yoshikazu Shimosato
Life of this patent
Estimating the term…
Abstract
A continuous heat treating furnace for heat treating a ferrous metal work in a protective atmosphere, including a furnace separated into a charge chamber and a heat treating chamber by a partition door and provided with a transport device for transporting the work. A first heating device, a recirculating fan and a gas purge device are provided in the charge chamber, while a second heating device is provided in the heat treating chamber supplied with the protective atmosphere, whereby the work is preheated through convectional heat transfer in the charge chamber simultaneously with high-temperature purging of the charge chamber and then, is heat treated under the protective atmosphere in the heat treating chamber.
Claims8
A continuous heat treating furnace for heat treating a ferrous metal work in a combustible protective atmosphere, said furnace being lined with refractories and comprising:
- a charge door which is provided at one end of said furnace;
- a discharge door which is provided at the other end of said furnace;
- a partition door for separating said furnace into a charge chamber and a heat treating chamber;
- a heating means for heating said work in said charge chamber and said heat treating chamber;
- a transport means for transporting said work in said charge chamber and said heat treating chamber;
- a recirculating fan for transferring convectional heat to said work;
- a gas purge means for purging said charge chamber;
- a combustion means for burning, into burnt exhaust gas, combustible exhaust gas generated by burning an atmosphere in said charge chamber so as to supply the potential heat of the burnt exhaust gas, as radiant heat, to said charge chamber;
- said recirculating fan, said purge means and said combustion means being provided in said charge chamber;
- and
- an agitating means for agitating the combustible protective atmosphere supplied into said heat treating chamber, which is provided in said heat treating chamber, whereby said work is preheated in said charge chamber to a temperature enabling sufficient vaporization of such impurities as oil on said work and then, is subjected to a predetermined heat treatment in said heat treating chamber.
A continuous heat treating furnace for gas carburizing a ferrous metal work, said furnace being lined with refractories and comprising;
- a charge door which is provided at one end of said furnace;
- a discharge door which is provided at the other end of said furnace;
- a first partition door for separating said furnace into a charge chamber and a heat treating chamber;
- a second partition door for separating said heat treating chamber into a carburizing chamber and a cooling chamber;
- a heating means for heating said work in said charge chamber, said carburizing chamber and said cooling chamber;
- a transport means for transporting said work in said charge chamber, said carburizing chamber and said cooling chamber;
- a recirculating fan for transferring convectional heat to said work;
- a gas purge means for purging said charge chamber;
- and
- a combustion means for burning, into burnt exhaust gas, combustible exhaust gas generated by burning an atmosphere in said charge chamber so as to supply potential heat of the burnt exhaust gas, as radiant heat, to said charge chamber;
- said recirculating fan, said gas purge means and said combustion means being provided in said charge chamber, whereby after said work has been preheated in said charge chamber to a temperature enabling sufficient vaporization of such impurities as oil on said work, said work is subjected to carburizing and diffusing proceses in said carburizing chamber upon heating of said work to a carburizing temperature and then, is cooled to a hardening temperature in said cooling chamber.
Dependencies are inferred from the claim text.