RU2232363C1 - Shaft kiln of resistance for thermal treatment of parts out of steels and alloys - Google Patents

Abstract

FIELD: metallurgy.

SUBSTANCE: the invention is dealt with the field of electro-thermal equipment. The shaft kiln of resistance for a thermal treatment of component parts out of steels and alloys consists of: a housing, a lining, a muffle, heaters, a cover, tubes for a protective gas entry in the working space of the muffle and its exit out of it, a container for cooling component parts heated in the muffle and an adapter unit. The container for cooling is filled with a coolant and is enclosed with a water jacket. The muffle is made open in its lower part. The container for cooling through a detachable joint is hermetically connected with the lower part of the muffle using an adapter unit with a shutter. The invention allows to ensure accelerated and a uniform cooling of component parts of high dimensional accuracy in a protective medium, a capability to make loading of component parts into a heated furnace without an oxidation of a surface and realization of all known kinds of a thermal treatment.

EFFECT: accelerated and uniform cooling of parts of the high dimensional accuracy in a protective medium, loading component parts in the heated furnace without oxidation of surface.

2 cl, 1 dwg

Description

The invention relates to the field of electrothermal equipment and can be used, for example, for heat treatment of high-precision thin-walled parts of the ring type from maraging steel.

Known resistance shaft furnace for heat treatment of parts, consisting of a casing, lining, muffle, heaters, cover, tubes for entering the muffle's working space and exiting protective gas from it, a container for cooling parts heated in the muffle, filled with a cooling medium and surrounded by a water jacket , and a transition device, taken as the closest analogue (see SU 253839, CL F 27 B 5/04, 10/07/1969).

The disadvantages are:

- low furnace productivity;

- limited scope;

- high cost of the process.

The proposed invention solves the problem:

- increase the productivity of the furnace for heat treatment;

- expansion of the scope;

- reduction in the cost of the process;

- improving ease of use.

The technical result is:

- in ensuring accelerated and uniform cooling of parts of high dimensional accuracy in a protective environment;

- the ability to load parts into a heated furnace without oxidizing the surface;

- the possibility of implementing all known types of heat treatment.

The specified technical result is achieved by the fact that in a shaft furnace resistance for heat treatment of parts of steel and alloys, consisting of a casing, lining, muffle, heaters, cover, tubes for entering the working space of the muffle and exiting the protective gas from it, a container for cooling heated in the muffle of parts filled with a cooling medium and surrounded by a water jacket, and a transition device, the muffle is made open in the lower part, and the cooling container is sealed to the lower part by means of a detachable connection part of the muffle through a transition device having a shutter.

In a resistance shaft furnace, gas or liquid was used as a cooling medium for the heat treatment of steel and alloy parts.

The above set of distinctive features provides: increasing the productivity of the furnace for heat treatment, the possibility of implementing all known types of heat treatment, reducing the cost of the process, improving ease of use.

The invention is illustrated in the drawing, which shows a General view of a shaft resistance furnace for heat treatment of parts of the type "ring", a longitudinal section.

The furnace consists of a sealed casing 1 with a muffle 2 made of heat-resistant steel, a lining 3 located on the walls of which there are nichrome heaters 4, a cover 5, which ensures the tightness of the furnace in the upper part, a tube 6 for supplying the coveted gas into the working space of the furnace muffle 2. The muffle 2 of the furnace, open from below, is connected through a transition device 7 having a shutter 8 with a capacity for cooling 9 parts. The cooling tank 9 has a detachable connection 10 with the adapter 7, which allows during the operation to replace one tank for cooling 9 parts with another, while the composition of the protective gas in the muffle 2 of the furnace does not change. The cooling tank 9 of the parts, for example, a “ring”, has a cylindrical shape filled with protective gas and surrounded by a water jacket 11. The cooling tank 9 is shielded with protective gas by means of a pipe 12 located at the inlet of the cooling tank 9 and a pipe 13, located on the adapter 7. Parts of the "ring" type 14 are placed on a stand made of a thin-walled steel pipe 15 fixed to the base 16. To transfer the parts 14 from the cooling tank 9 to the heated muffle 2 of the furnace, adapted 17 e.

Shaft resistance furnace for heat treatment of parts of the type "ring" of maraging steel works as follows.

Parts 14 are placed on a rack, which is placed in a cooling tank 9 when it is not connected to the adapter 7. In the cooling tank 9 with parts 14, the oxidizing medium is replaced by a protective gas, for example argon, through the pipe 12. Then, the cooling container 9 using a detachable connection 10 is hermetically connected to the adapter 7 and the final shielding gas is blown using the nozzles 12 and 13. After the shielding gas is completed, the rack with parts 14 is lifted from the cooling tank 9 by means of the device 17 with the shutter open 8 into the space of the furnace muffle 2 heated to the required temperature, filled with protective gas. The movement of the device 17 is made through the hole 18, made in the cover 5 of the furnace. After heating and technological exposure of the part 14, the parts with the help of the device 17 are moved to the cooling tank 9 with the shutter 8 open. Then, using the detachable connection 10, the cooling tank 9 is disconnected from the adapter 7 with the shutter 8 closed, without stopping the supply of protective gas through the pipe 12. Hermetically close the container for cooling 9 with a lid having an opening for the exit of the protective gas, and cool the parts 14 to a predetermined temperature, maintaining excessive pressure in the tank for cooling 9. After cooling, the rack with parts 14 is removed from the tank for cooling. This order of movement of parts during heat treatment is implemented in the case when the cooling medium is gas.

When used for cooling liquid media, the loading of parts into the working space of the furnace muffle 2 is carried out through the furnace cover 5.

Claims (2)

1. Shaft resistance furnace for heat treatment of parts made of steels and alloys, consisting of a casing, lining, muffle, heaters, cover, tubes for entering the muffle working space and exiting protective gas from it, a container for cooling parts heated in the muffle filled with cooling medium and surrounded by a water jacket, and a transition device, characterized in that the muffle is made open in the lower part, and the cooling tank using a detachable connection is hermetically connected to the lower part of the muffle through the transition e device having a flap. 2. The furnace according to claim 1, characterized in that gas or liquid is used as the cooling medium.