JPS5950171A - Continuous electric furnace for chemically heat treating steel part - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a vacuum and gas-charged electrical heating system, and more particularly to a continuous air furnace for the chemical heat treatment of steel parts.

The invention can be used most surface-wise for vacuum carburizing in gas technology, the automobile industry and in other fields of machine construction.Furthermore, the invention provides It can be used for thermal heat treatment.

The present invention is also applicable to vacuum brazing and other treatments such as surface impregnation with elements such as silicon, titanium, and minerals.

Maximum efficiency in chemical heat treatment of ff15 products is achieved through the use of continuous furnaces.

A surface hardening furnace (A,
Handbook edited by P, AltgauZen, MO8COW, Electroth
ermic Equipment”1967, p.
178, Fig. 5-155) is a known technique. The furnace incorporates a grinder that feeds the parts into the hardening chamber and a transfer device that transports the parts into the cooling chamber. The heating chamber is equipped with a fan to drive the medium during the carburizing process. Such a furnace is Aic
Adopted by the Helin and Halcroft Company.

The furnace works as follows. The parts are loaded into the container. The container loaded with the parts is placed on the loading device and a squeezer moves it into the surface curing chamber. The chamber door is opened and the part is passed through the door opening into the heating chamber where it is heated to a carburizing temperature while moving through the chamber. The furnace generally employs a frame curtain to retain the media within the hardening chamber. The surface curing chamber is filled with saturated gas supplied thereto.

Once the carburizing process is complete, the charging door opens and the charge advances into the cooling chamber.

The furnace is a fire and explosion hazard device, degrades the working environment and requires ventilation equipment with special features. The furnace kit must include an environmentally controlled gas generator with high cleaning power and must also incorporate the furnace's natural gas supply. Since the concentration of carbon is easily disturbed during charging and charging operations, the concentration of that element must be precisely IJ ml inside the furnace. It should be noted that it is not appropriate to increase the temperature inside the furnace, since the structural components of the furnace (including the heater and lining) are subject to the accumulation of soot, which can lead to damage to the heater and therefore a reduction in the output of the furnace. isn't it.

Heat treatment with equipment for vacuum cooling and further inert gas cooling, with charging and unloading chambers equipped with vacuum seals, hardening chamber with thermal insulation made of fiber material, and vacuum cooling chamber The continuous vacuum furnace for is a known technology (Data 5he of Hays00mpan7
et A 771 type LV, moaelcv
ccl-202456]. The furnace works as follows. The seal of the surface curing chamber is closed and the container filled with product is loaded into the charging chamber. The charging chamber door is then closed, the chamber is evacuated to a predetermined vacuum, and the vacuum seal is opened to load the container into the hardening chamber. In communication with the entry chamber, the product being filled is heated to carburizing temperature and carburized while the container moves through the hardening chamber. Once the entire case hardening cycle has been completed, the product is then advanced to a cooling section where it passes through another vacuum seal and into an inert gas rapid cooling section.
It is then moved to the ejection chamber.

The conventional furnace structure does not allow for uniform carburization because the product placed in the charging chamber does not absorb carbon uniformly at different temperatures, and therefore the thickness of the carburized layer changes. Not provided to obtain layers. Furthermore, conventionally designed furnaces require a large amount of carburizing gas and carburizing gas, since the furnace must be filled to its capacity with reactant gas. It required li power. Further, a gun-shape furnace having a charging chamber, an unloading chamber, a heating chamber, an intermediate chamber attached by a holder to a vertically movable button in which a heating element is attached, and a cooling chamber is a well-known technology. There was (USSR engineer ventor'e Cer
tificate A601 51 7, C21D
9100.1978).

The furnace works as follows. The product to be processed is placed in a pan. Each bread is placed in the charging chamber, and after the seal is opened, the bread is moved into the heating chamber, where the bread is held for a predetermined period of time.

Then the next loaf of bread is loaded into the oven.

During each filling, the pan is gradually heated, coming under the middle chamber. When the middle chamber is moved downwards, the loaf of bread appears to be within the heat treatment zone.

After a certain exposure time, the cylinder moves the intermediate chamber to the initial position, and the bread with the product remains there for a certain period of time.
Leave it in the pan, and then send the bread to the cooling room.

The bread is fed from the cooling chamber to the discharge chamber (13), after which the operation is repeated. Not suitable for closing.

In addition, the structure of the furnace is as described above.
'Therefore, it is Suribō. Continuous electric furnaces for the chemical heat treatment of components are also known which have a component heating chamber divided into separate heating zones, a divided thermally insulated wet treatment chamber connected to a component vertical supply chamber, and a cooling chamber. ( [JEt
SR Engineer's Certificate
A 456569, F27B9/22 1976)
. The heating chamber, the chamber for vertically feeding products into the processing chamber, and the cooling Y are aligned, and the processing chamber is placed 111 outside the column for continuous horizontal feeding of parts.

The furnace works like a light. The container containing the parts sent into the heating chamber moves along the chamber and is gradually heated. Once the part has been heated to a predetermined temperature, the product is passed from there to a vertical feed k, which moves the part to a processing station where the part is processed at a predetermined temperature. Processing inside the processing chamber J (If 1! is incorrect,
Move the container containing the parts to the bottom! ! +II t,, and is sent further to the cold JDL room.

Previous furnaces did not have the necessary hardening equipment to provide effective chemical heat treatment of the parts.

The present invention aims at providing a continuous electric furnace for the chemical heat treatment of steel parts, in which additional structural parts, common equipment and the reciprocity of said parts Vr:I+1 are provided during the treatment process. minimizes the temperature shadow 11γ on the furnace bud closure element, thus sealing the processing chamber during the heat treatment, thus extending the range of industrial use of the furnace, reducing carburizing gas and its power consumption; It will make it possible to improve the quality of the parts processed.

This means that a component heating chamber, a component cooling chamber, and a chamber for the vertical supply of components are connected and located between and aligned with and coplanar with said heating and cooling chambers for continuous horizontal supply of components. In a continuous electric furnace for chemical heat treatment of steel parts, the heating chamber and the cooling chamber are formed in one row. Incorporating an extension stop placed on the side of the vertical feed chamber and a thermal screen,
JifL! The hearths of the two chambers are adapted for horizontal reciprocating motion, and the hearth of the processing chamber is provided with a vacuum seal that separates the processing chamber from another chamber of the furnace during the chemical heat treatment of the parts. There is.

The use of the above-mentioned structural elements and common equipment and their interaction during the operation of continuous electric furnaces for the chemical heat treatment of steel parts is such that during the chemical heat treatment the treatment furnace is closed and the operating heat of the furnace is properties and thereby uniform heating of the product, resulting in improved quality of the processed product and reduced processing costs.

Next, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

A continuous electric furnace for chemical heat treatment of manufactured parts consists of a case 1 (1) housing a heating chamber 2, a cooling chamber 3 and a processing chamber 4 connected to a chamber 5 for vertical feeding of parts 6. Figure 1).

The heating chamber 2 is made of ceramic refractory material. The hearth 7 of the heating chamber 2 is connected to a device 8 for moving the hearth 7. A device W 9 for moving the parts 6 is arranged on the charging side of the heating chamber 2 . Extension stop device it
10 and a thermal screen 11 are arranged on the end side of the heating chamber 2 facing the chamber 5 for vertical feeding of parts 6.

The cooling chamber 3 is made of ceramic refractory material. The hearth 12 of the cooling chamber 3 has a device 1 for moving the hearth.
It is connected to 3. The extension stop 14 and the thermal screen 15 are arranged on the end side of the cooling house facing the chamber 5 for vertical feeding of the parts 6.

The processing chamber 4 is made of carbon-graphite material. The hearth 16 of the processing chamber 4 is connected to a device 18 used for moving the hearth and for separating the processing chamber 4 from the other chambers 2 and 3 of the furnace during the chemical heat treatment of the parts 6. It is equipped with TakZshi/'17.

Figure 2, which shows the cross section along the line ■-■ in Figure 1, shows the heating
2 and the flashing arrangement of the processing chamber 4, the structure of the thermal screen 11 (FIG. 1) attached by a bracket 19 to the shaft 2o rotating around the journal 21, and the roller 2
The structure of the furnace 1+<7 movable in the heating chamber 2 moving on the guide 22 by the means of 3 and the arrangement of the heating link 24 inside the processing chamber 4 are shown.

t+: Product manufactured by X [The continuous electric furnace for chemical heat treatment of product X operates as follows.

The parts 6, which are successively introduced into the heating chamber 2 (FIG. 1), are moved along the furnace over the hearths 7, 12 and 16 by means of a device 9. During the movement of part 6, hearths 7, 12 and 16
remains in the position shown in FIGS. 5(a) and (1)), and the part 6 is moved from the hearth 7 to the hearth 16. was replaced,
Part 6 is transferred from the hearth 16 to the hearth 12 (Fig. 6(b)).
It can be changed to rt. Thereafter, the hearth 7 (FIG. 6(c)') moves to the leftmost position i'ft, the hearth 12 moves to the rightmost position, and the hearth 16 rises to its uppermost position.

The stop devices f, f' 10 and 14 are extended, the hearths 7 and 12 are moved off to their intermediate position (FIG. 6(d)), and the stop devices 10 and 14 move the part 6 into the position shown in FIG. 6(C). Hold in the position shown.Thermal screens 11 and 15 (FIG. 1)
is closed. The hearth 16 raises the part 6 to the chamber 4 and separates it from the interior space of the furnace without any gaps.

When the processing of the parts 6 in the processing chamber 4 is completed, the hearth 16 is moved to the fifth
Lowered to the position 16 shown in Figure (a), the device 9 moves the part 6 to the next position and the cycle is repeated.

When an electric furnace is used for chemical heat treatment of products, for example for vacuum carburizing, the parts 6 charged into the heating chamber 2 are first heated in a vacuum or in a neutral gas medium at low pressure. Ru. Inside the treatment chamber 4, the component is carburized in a carbon-containing gas medium. At step 17 of this step, the reactant gas can be repeatedly freshened by pumping it out with a bonder and partially injecting fresh gas. i? charged into cooling chamber 3? The +ls article 6 is subjected to further heat treatment in vacuum or in a neutral gas medium. When the part 6 is unloaded from the electric furnace, the furnace D+<12 is placed in the position shown in Figure (Q).

The present invention achieves the above objectives.

The use of stop devices 10 and 14 (FIG. 1) and the use of thermal screens 11 and 15 minimize the effect of 1A; 6 to improve uniform heating and minimize power consumption.

Since there is equipment in the furnace for sealing the processing chamber 4, the range of industrial use of the furnace can be expanded, and the power consumption per ton of manufactured products can be reduced by 1.5 or 2 times. , and the amount of reaction gas consumed can be reduced by 8 to 10 times.

The electric furnace with this structure makes it possible to carry out various chemical heat treatment processes and produce high-quality products. The electric furnace according to the invention prevents the release of harmful gaseous impurities and thus contributes to improved production conditions.

[Brief explanation of the drawing]

Fig. 1 is a sectional view of a continuous electric furnace for chemical heat treatment of steel parts according to the present invention, Fig. 2 is a sectional view taken along the line It is a line diagram showing movement of parts. The symbols used in the drawings are as follows. 1...Furnace case 2...Component heating chamber 3...
・Parts cooling room 4... Room J (1'! Room 5...
Parts vertical supply pipe 6... Parts 7... Heating chamber hearth 8... Device for moving the hearth 7 9... Parts moving device 10... Heating chamber extension stop liquid) hlll...
・Heating chamber thermal screen 12...Cooling chamber hearth 13...
Device 14 for moving the hearth 12...Cooling chamber extension stop device 15...Cooling chamber thermal screen 16...Processing chamber hearth 17...Processing chamber vacuum seal 18...Vacuum seal moving device 19. ...Bracket 20...Shaft 21...Journal 22
...Guiding part 23...Roller 24...
Heating element agent: Asari, 4 people, Hb', j Page continued Inventor: Igor Vladimirovich e Balabanov, Soviet Union, Moscow, Prospekt Budenogo, 28 Corpus 1, Cave 8 Inventor: Eduard Nikitovich Marmel Soviet Union Moscow Novolesnaya Ulitsa 17-Ei Kaybui 48 1 Inventor Alexander Fedorovich Puzanov Soviet State Moscow Porjoy Fakernii Pereulok 3 Cabui 26 0 Inventor Alexander Polisovich Lobanov Soviet State Moscow Ulitosa Zelenodolskaya 14 Corpus 2 Cave 21 O Inventor Yuri Pavlopich Usatei Soviet Union Moscow Ulitsa Kushkentskaya 4 Corpus 2 Cave 143 0 Inventor Vladeimir Ivanovich Gerasimov Soviet Union Moscow Ulitsa Zelenodolskaya 14 Corpus 2 Cave 120 Inventor Arkady Konstantinovich
Teikhonov Soviet Union Tolyatty Ulitsa Dozerginskogo 69 Cave 228 0 Inventor Viktor Nikolaepich Tsurlin Soviet Union Tolyatty Ulitsa Dozerginskogo 72 Cave 82 -364=

Claims (1)

[Claims] A chamber (2) for heating the part (6), a chamber (3) for cooling the part (6) and a chamber (5) for vertical feeding of the part (6) connected to the part (6). ) is arranged between the two chambers (3, 2) for heating and cooling the parts (3, 2) and is aligned with them, thereby forming a row for continuous horizontal feeding of the parts (6). ) in a continuous electric furnace for chemical heat treatment of steel parts, said two chambers (2, 3) for total heating and cooling of the 111S product (6) are for vertical feeding of the part (6). Placed on the side of the chamber (5)
The hearths (7, 12) of the two chambers for heating and cooling are horizontally reciprocatingly interlocked. The hearth (16) of the processing chamber (4) is
is characterized by being equipped with a vacuum seal (17) that separates the processing chamber (4) from the other furnace chambers (2, 3, 5) in the process of chemical heavy wall treatment of steel parts (6). Continuous electric furnace for chemical heat treatment of steel parts.