KR101600576B1 - Mold heat processor of noxious gas combustion and recycling function having - Google Patents

Mold heat processor of noxious gas combustion and recycling function having Download PDF

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Publication number
KR101600576B1
KR101600576B1 KR1020150177009A KR20150177009A KR101600576B1 KR 101600576 B1 KR101600576 B1 KR 101600576B1 KR 1020150177009 A KR1020150177009 A KR 1020150177009A KR 20150177009 A KR20150177009 A KR 20150177009A KR 101600576 B1 KR101600576 B1 KR 101600576B1
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South Korea
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gas
combustion
hot air
heat treatment
heat
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KR1020150177009A
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Korean (ko)
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김석
김종삼
서상원
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서상원
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    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • C23C8/00—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals
    • C23C8/40—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using liquids, e.g. salt baths, liquid suspensions
    • C23C8/42—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using liquids, e.g. salt baths, liquid suspensions only one element being applied
    • C23C8/44—Carburising
    • C23C8/46—Carburising of ferrous surfaces
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
    • C21D9/0068—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for particular articles not mentioned below
    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • C23C8/00—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals
    • C23C8/80—After-treatment

Abstract

The present invention relates to a mold having a waste gas combustion and recycling function capable of burning off the untreated harmful waste gas generated during the heat treatment of a mold and recovering the combustion gas generated in the combustion of the harmful waste gas to be recycled as hot air for heating To a heat treatment apparatus.
The present invention relates to a heat treatment furnace (100) comprising a refractory brick (110) and a heat insulating material (120) and having an open top; A port 200 opened at an upper portion of the heat treatment furnace 100, A lid 300 having a blowing fan 310 installed at an upper portion of the port 200 so as to open and close the port 200 to form an internal air flow of the port 200; A heater 400 installed on an inner wall of the heat treatment furnace 100 to heat a port 200 containing a metal mold; A gas discharge pipe (500) installed in the lid (300) and discharging harmful waste gas; A combustion member 600 installed at an upper portion of the gas discharge pipe 500 for burning and removing waste gas discharged therefrom; And a recycling member (700) for recovering the combustion gas generated in the combustion of the waste gas of the combustion member (600) and supplying it as hot air for heating.

Figure R1020150177009

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a mold heat treatment apparatus having a waste gas combustion and recycling function,

The present invention relates to a mold heat treatment apparatus having a waste gas combustion and recycling function, and more particularly, to a mold heat treatment apparatus capable of burning off untreated harmful waste gas generated during a heat treatment of a mold, To a mold heat treatment apparatus having a waste gas combustion and recycling function that can be recovered and recycled as hot air for heating.

In general, the heat treatment technique of the mold or the tool is a key process for improving the productivity and quality characteristic of the product by improving the performance and the durability life of the mold. The mold material has a high carbon content and a large amount Of the alloying element is added, and there is a risk of deformation or cracking due to the heat treatment. Therefore, in the heat treatment of the mold, it is required that the deformation before and after the heat treatment is small, the room temperature and the high temperature hardness are high, the hardness and the dimensional change by the heat generation during use are small, and the abrasion resistance and toughness are great.

Therefore, products such as molds are improving their properties through various heat treatment processes. Carburizing, nitriding, high frequency heat treatment, and annealing heat treatment are applied to the heat treatment method.

Carburizing heat treatment is usually used to increase the surface hardness of products made of low carbon and low alloy steel, and gas carburization is mainly applied in recent years. In the high-frequency heat treatment, carbon steel having a carbon concentration of 0.4% or more or quenching is used as an alloy steel capable of achieving high hardness, and the core portion is left in a material state, and the surface (usually 0.8 to 2.5 mm) Is applied. Also, nitriding heat treatment is a generally applicable method, in which ammonia gas or nitrogen gas is used to obtain a nitrogen compound layer on the surface of a heat treated object.

In such a heat treatment method, the carburization heat treatment and the nitriding heat treatment using gas are required to be performed in a heat treatment furnace which takes a long heat treatment time and has a limited space, so that it is required to increase thermal efficiency and production amount. Since the heat treatment is performed in a state where a large amount of the object is charged in the heat treatment furnace, it is required that the heat treatment atmosphere is effectively maintained to increase the heat efficiency and shorten the heat treatment time.

As a proposed technique for such a necessity, a heat treatment furnace apparatus of an iron-based metal is disclosed in the following Patent Document: Korean Patent Publication No. 1994-0001345.

According to this, in the heat treatment apparatus, upper and lower circulation fans are opened so that upper and lower parts of the furnace body are opened to face each other, and propane (C3H8) and ammonia (NH3) can be supplied in the upper part of the heat pipe constituting the furnace body And the exhaust port of each of the exhaust gas heating pipes is located near the impeller constituting the lower circulation fan. In the lower part of the exhaust port of the propane and ammonia-added gas heating pipe, ammonia and carburizing (CO 2) and a propane supply pipe (N 2) supply pipe are provided between the lower gas supply pipes in accordance with an atmosphere at equal intervals, and an upper circulation fan is constituted between the lower gas supply pipes A plurality of additional gas supply pipes are formed at equal intervals in the radial direction .

According to the conventional technology, the carburizing, nitriding, carburizing, carburizing, nitriding, and heat treatment of the mold can be performed only by adjusting or changing the supplied gas according to the characteristics of the workpiece for the heat treatment, The lower part of the furnace is open and the circulation fan is installed on the upper and lower sides of the furnace so that the additive gas is directly diffused from the surface of the workpiece to accelerate the addition gas reaction and to equalize the temperature, have.

However, since the conventional art has discharged the harmful waste gas generated during the heat treatment of the mold to the atmosphere without the treatment, there arises a problem of causing environmental pollution and pollution problem due to the atmospheric release of the harmful waste gas structurally untreated. The prior art has a problem in that the harmful waste gas generated during the heat treatment of the mold is discharged to the outside without being recycled, thereby wasting energy.

In addition, since the structure of the conventional heat treatment apparatus is complicated, it is difficult to manufacture and maintenance of the apparatus. In particular, the surface hardness of the mold and the inadequate distribution of hardness, and the microcracks generated after the heat treatment, There was a problem of shortening the life span.

Patent Document: Patent Publication Publication No. 1994-0001345 (Publication Date: Feb. 19, 1994)

It is an object of the present invention to overcome the above-mentioned drawbacks of the prior art, and to provide a method of burning a harmful waste gas generated during a heat treatment of a mold to solve the environmental pollution and pollution problem And to provide a mold heat treatment apparatus having a waste gas combustion and recycling function.

Another object of the present invention is to provide a heat treatment apparatus for a mold having a waste gas combustion and recycling function, which is capable of economically saving energy by giving a function of recycling the combustion gas generated during combustion of harmful waste gas as hot air for heating.

It is still another object of the present invention to provide a method for producing a nitrided layer which is dense on the surface of a mold and has a high surface hardness and a good hardness distribution of the nitrided layer and which is free from microcracks to thereby improve the life of the mold, And to provide a mold heat treatment apparatus.

In order to accomplish the above object, the present invention provides a heat treatment furnace comprising a heat treatment furnace having an open upper part made of refractory bricks and heat insulating material, and a port having an open upper part for accommodating a product such as a mold or a tool, A cover provided with a blowing fan for generating an internal air flow of the port is provided on the upper portion of the port so as to be openable and closable and a heater for heating a port accommodating a metal is disposed on the inner wall of the heat treatment furnace, A gas discharge pipe for discharging the harmful waste gas is provided and a combustion member for burning off the waste gas discharged to the upper portion of the gas discharge pipe is provided and the combustion gas generated during the combustion of the waste gas is collected in the lower part or the upper part of the combustion member, And a recycling member for supplying hot air.

In addition, in the present invention, the combustion member may include a stationary disk fixed to the upper portion of the gas discharge pipe, and a plurality of gas exhaust holes fixed to the stationary disk to surround the upper portion of the gas discharge pipe, A heat insulating material provided on the inner circumference of the outer cylinder and a heater disposed in a state of being separated from the inner circumference of the inner circumference of the heat insulating material so as to burn off waste gas; A lid provided on the outer cylinder for sensing a temperature of the heater, a lid provided on an upper portion of the outer cylinder so as to be spaced apart from an upper portion of the inner cylinder and having a discharge hole for discharging the combustion gas into the atmosphere, and a plurality of air inflow holes; A guide provided at a lower portion of the lid to guide the combustion gas downward, and a blocking lid provided in a state of being separated from the upper portion of the lid.

Further, in the present invention, the heater is installed so as to be embedded in the inner surface of the refractory, and the heater burns the harmful waste gas at a temperature of 800 ° C.

According to the present invention, the recycling member is connected to the lower center of the combustion member and includes a combustion gas recovery passage having a recovery path for recovering the combustion gas and an exhaust path for exhausting the combustion gas, A plurality of discharge ports provided in the hot air duct for discharging hot air into the room, and a suction fan installed in the hot air duct.

The recycling member may include a hot air duct connected to the upper center of the combustion member to recover the combustion gas, a plurality of discharge ports provided in the hot air duct to discharge hot air into the room, and a suction fan installed in the hot air duct, .

In the present invention, a gas supply pipe for supplying ammonia gas, nitrogen gas and carbonic acid gas into the port is connected to the lower portion of the port.

In the present invention, 70% of ammonia gas, 20% of nitrogen gas and 10% of carbonic acid gas are supplied to the inside of the port through a gas supply pipe, and the metal mold received in the port is heat-treated at a temperature of 550 to 580 ° C, A nitride layer is formed on the surface of the silicon nitride film.

Further, in the present invention, the hot air duct of the recycling member is formed with a heat exchange tube built in a heat exchange tube, a cold water supply pipe having a valve is connected to a hot water recovery pipe, and a safety net is installed outside the heat exchange pipe will be.

In the present invention, the hot air duct of the recycling member is formed with a heat exchange tube embedded in the heat exchange tube, a heat storage material is filled in the heat exchange tube, and a safety net is provided outside the heat exchange tube.

According to the mold heat treatment apparatus having the waste gas combustion function of the present invention, since the combustion exhaust gas is provided in the gas exhaust pipe to burn and remove the harmful waste gas, the harmful waste gas generated during the heat treatment of the mold can be easily treated and removed Thus, it is possible to prevent environmental pollution and pollution caused by untreated harmful waste gas to the atmosphere.

In addition, since the combustion member is provided with a recycling member that recovers the combustion gas generated during combustion of the harmful waste gas and supplies the combustion gas to the room by heating hot air for heating, the harmful waste gas generated during the heat treatment of the mold is combusted and removed, Can be recovered and recycled as hot air for heating, so that energy can be economically saved.

In addition, ammonia gas, nitrogen gas and carbonic acid gas are supplied to the interior of the port to form a nitrided layer having high surface hardness, good hardness distribution and microcracks on the surface of the mold, There is an effect that can be improved.

1 is a front view showing the entire structure of the present invention.
2 is a sectional view showing a heat treatment apparatus according to the present invention.
3 is a sectional view showing a combustion member and a recycling member according to the present invention.
4 is a front view showing another embodiment of the present invention.
5 is a sectional view showing another embodiment of the recycling member according to the present invention.
FIGS. 6 and 7 illustrate another embodiment of the present invention. FIG.
8 is an exemplary view showing still another embodiment of the present invention.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the technical structure of the present invention will be described in detail with reference to the accompanying drawings.

As shown in FIG. 1 to FIG. 5, the mold heat treatment apparatus having a waste gas combustion and recycling function according to the present invention includes a heat treatment furnace 100 having an open upper part composed of a refractory brick 110 and a heat insulating material 120; A port 200 opened at an upper portion of the heat treatment furnace 100, A lid 300 having a blowing fan 310 installed at an upper portion of the port 200 so as to open and close the port 200 to form an internal air flow of the port 200; A heater 400 installed on an inner wall of the heat treatment furnace 100 to heat a port 200 containing a metal mold; A gas discharge pipe (500) installed in the lid (300) and discharging harmful waste gas; A combustion member 600 installed at an upper portion of the gas discharge pipe 500 for burning and removing waste gas discharged therefrom; And a recycling member (700) for recovering the combustion gas generated in the combustion of the waste gas of the combustion member (600) and supplying it as hot air for heating.

Here, the mold heat treatment apparatus having a waste gas combustion and recycling function of the present invention burns and removes harmful waste gas, recovers the combustion gas generated during combustion of harmful waste gas, and recycles it as hot air for heating. The waste gas combustion and recycling The heat treatment apparatus having the function includes a heat treatment furnace 100, a port 200, a lid 300, a heater 400, a gas discharge pipe 500, a combustion member 600 and a recyclable member 700.

Further, the mold heat treatment apparatus having a waste gas combustion and recycling function of the present invention forms a dense and high-hardness nitrided layer on the surface of a mold, a tool, and the like. The mold heat treatment apparatus having such a waste gas combustion and recycling function, And a gas supply pipe (800) for supplying ammonia gas, nitrogen gas, and carbon dioxide gas to the interior of the reactor (200).

The bottom of the heat treatment furnace 100 is made of refractory bricks 110 and the outer wall of the heat treatment furnace 100 is made of a heat insulating material 120. The heat treatment furnace 100 is a main body of the mold heat treatment apparatus. The heat treatment furnace 100 is opened at an upper portion to receive the port 200. An iron plate 130 is installed on the outer surface of the heat insulating material 120. The heat insulating material 120 is made of ceramics It is made of wool.

The port 200 is internally spaced apart from the heat treatment furnace 100 to receive a product such as a mold or a tool. The port 200 is open at its upper portion to receive the metal mold, 200 are made of stainless steel so as to withstand the internal pressure generated in the heat treatment. At this time, a flange 210 that is seated on the upper surface of the heat treatment furnace 100 is formed on the upper part of the port 200. A stirrer guide tube 220 is installed in the port 200, And a lid 230 is installed on the upper portion of the body 220. In addition, a basket 240 for supporting the product 10 is installed in the port 200.

The lid 300 is installed at an upper portion of the port 200 so as to be openable and closable. The lid 300 has a blowing fan 310 for generating an internal air flow of the port 200, Respectively. The bottom surface of the lid 300 is formed as a curved surface concaved at the center and the blowing fan 310 is installed at the bottom center of the lid 300, (320) is installed on the top of the lid (300). A mechanical pressure relief valve 330 is provided in the lid 300 and a mechanical safety valve 340 is provided in consideration of the risk of electric internal pressure control failure in consideration of the risk of internal pressure of the port 200 Respectively.

The heater 400 is installed on the inner wall of the heat treatment furnace 100. The heater 400 serves to heat the port 200 in which the metal mold is received. At this time, the heater 400 is configured to heat the port 200 to a temperature of 550 to 580 ° C.

The gas discharge pipe 500 is installed at one side of the upper part of the lid 300, and the gas discharge pipe 500 discharges the harmful waste gas into the combustion member 600. At this time, a flange 510, which is fixed to the upper part of the lid 300 by screws or the like, is formed on the lower part of the gas discharge pipe 500.

According to the present invention, the valve 520 of the gas discharge pipe 500 is connected to the check pressure gauge 330 when the ammonia gas is supplied, It receives the signal and opens it to automatically discharge the waste gas.

The combustion member 600 is installed on the upper portion of the gas discharge pipe 500. The combustion member 600 serves to burn and remove the harmful waste gas discharged to the gas discharge pipe 500.

According to the present invention, the combustion member 600 includes a fixed disk 610 fixed to the upper portion of the gas discharge pipe 500 and a fixed disk 610 to surround the upper portion of the gas discharge pipe 500 in a spaced- An outer cylinder 630 fixed to the stationary disc 610 while being spaced apart from the inner cylinder 620; and an outer cylinder 630 fixed to the stationary disc 610. The inner cylinder 620 includes a plurality of gas exhaust holes 621 fixed to the inner cylinder 620, A heater 650 installed on the inner circumference of the heat insulating material 640 so as to be separated from the inner cylinder 620 to burn off waste gas and a heater 650 installed in the outer cylinder 630 A sensor 660 installed at the upper portion of the outer cylinder 630 to detect the temperature of the heater 650 and a discharge hole 671 spaced apart from the upper portion of the inner cylinder 620 and discharging the combustion gas to the atmosphere, And a lid 670 provided with a plurality of air inflow holes 672. The lid 670 is provided at a lower portion of the lid 670, And that is configured to guide 680, and a block of freshly 690, which is installed in a state of being spaced apart on top of the lid 670 is characterized.

The fixed disk 610 is fixed to the upper portion of the gas discharge pipe 500. An insertion hole 611 is formed at the center of the fixed disk 610 to be inserted into the gas discharge pipe 500, A plurality of reinforcing ribs 612 are provided under the fixed disk 610. At this time, the fixed disk 610 plays a role of supporting the inner cylinder 620 and the outer cylinder 630.

The inner tube 620 is vertically fixed to the upper center of the fixed disk 610. The lower portion of the inner tube 620 is fitted with the upper portion of the gas discharge tube 500 being spaced apart, The gas exhaust hole 621 is formed. At this time, the inner tube 620 and the gas discharge tube 500 are spaced apart from each other, and the gas discharge tube 500 is inserted into the lower center of the inner tube 620 at a proper height. Therefore, the inner tube 620 covers the upper portion of the gas discharge tube 500 in a spaced-apart relationship.

The outer cylinder 630 is vertically fixed to the upper edge of the fixed disk 610. The outer cylinder 630 is spaced apart from the inner cylinder 620 so as to surround the inner cylinder 620.

The heat insulating material 640 is installed on the inner circumference of the outer cylinder 630. The heat insulating material 640 prevents the heat generated by the heater 650 from being discharged to the outside through the outer cylinder 630 unnecessarily Role.

The heater 650 is installed on the inner circumference of the heat insulating material 640 so as to be spaced apart from the inner cylinder 620. The heater 650 serves to burn and remove the harmful waste gas using heat at a high temperature . At this time, the heater 650 and the inner tube 620 are spaced apart by about 25 mm.

According to the present invention, the heater 650 is embedded in the inner surface of the refractory 651 to burn waste gas at a temperature of 800 ° C. At this time, since the heater 650 burns the harmful waste gas with heat at a high temperature of 800 DEG C, stability can be secured in the combustion process of the waste gas.

Meanwhile, according to the present invention, since the waste gas is combusted by the electric heater 650, energy can be saved significantly compared to burning the waste gas with the LPG gas.

In other words, the heat treatment time according to the mold product standard takes 150 minutes for 20T or less, 200 minutes for 50T or less, 240 minutes for 100T or less, and 300 minutes or less for 150T or less.

For example, the cost of heat treatment based on 100T mold products is as follows.

LPG gas (monthly: 26 days) Consumption: 50KG / one bottle (85,000 won) × 3.5 containers = \ 297,500 won.

Electricity cost (month: 26 days) Consumption: 1.8KW × 6.3HR (once / day) = 295KW

(Electricity base fee 5,500, 50 won per KW) = (295KW × 50 = 14750 + 5,500 = 20250 won)

As described above, the LPG gas consumption rate is about 300,000 won per month, but the heater 650 of the combustion member 600 used in the present invention is designed to be about 1.8 KW for the industrial electric furnace, Will also help a lot.

The sensor 660 is installed on one side of the outer cylinder 630. The sensor 660 senses the temperature of the heater 650 and maintains the set temperature. That is, the sensor 660 senses that the internal temperature of the inner cylinder 620 is maintained at 800 ° C during the combustion of the waste gas.

The lid 670 is installed at an upper portion of the outer cylinder 630 so as to be spaced from the upper portion of the inner cylinder 620. The lid 670 is provided with a discharge hole 671 for discharging the combustion gas into the atmosphere, A plurality of air inflow holes 672 are formed.

The guide 680 is installed at a lower portion of the lid 670. The guide 680 serves to guide the combustion gas downward as shown by an arrow in FIG. At this time, the guide 680 is inclined outward as shown in FIG.

The shutoff lid 690 is installed in a state of being separated from the upper part of the lid 670. The shutoff lid 690 prevents the flame generated in the combustion of the waste gas from being diffused to the upper side, And the like. At this time, the shutoff lid 690 is fixed to the upper part of the lid 670 through a plurality of spacing pieces 691.

The recycling member 700 recovers the combustion gas generated during the combustion of the waste gas of the combustion member 600 and supplies the combustion gas as hot air for heating. The recycling member 700 recycles the hot air for heating to the room It serves to supply.

1 to 3, the recycling member 700 includes a recovery path 711 connected to the lower center of the combustion member 600 to recover the combustion gas, A hot air duct 720 connected to a lower portion of the combustion gas recovery cylinder 710 to communicate with the exhaust passage 712 and a hot air duct 720 connected to a lower portion of the combustion gas recovery cylinder 710, A plurality of discharge ports 730 installed in the hot air duct 720 for discharging hot air into the room and a suction fan 740 installed in the hot air duct 720.

The combustion gas recovery tank 710 is connected to the lower center of the combustion member 600. The combustion gas recovery tank 710 is provided with a recovery path 711 for recovering the combustion gas and an exhaust path 712 are formed. 3, the combustion gas recovery cylinder 710 is fixed to the lower portion of the fixed disk 610 in a state of being fitted in the gas discharge pipe 500, and the fixed disk 610 is connected to the recovery path 711 A recovery hole 613 is formed.

The combustion gas recovered in the recovery path 711 and the exhaust path 712 of the combustion gas recovery tank 710 is supplied to the gas discharge pipe 710 through the gas discharge pipe 710, And then heated again by the heater 500 to provide hot air for heating.

The hot air duct 720 is connected to the lower portion of the combustion gas recovery tank 710 so as to communicate with the exhaust path 712. The hot air duct 720 is formed long in the longitudinal direction do.

As shown in FIG. 1, the plurality of discharge ports 730 are installed at appropriate intervals in the hot air duct 720, and the plurality of discharge ports 730 serve to discharge hot air for heating into the room.

The suction fan 740 is installed in the hot air duct 720 and the suction fan 740 serves to introduce the combustion gas into the hot air duct 720.

According to another embodiment of the present invention, as shown in FIGS. 4 and 5, the recycling member 700 includes a hot air duct 750 connected to the upper center of the combustion member 600 to recover combustion gas, A plurality of discharge openings 760 installed in the hot air duct 750 to discharge hot air into the room, and a suction fan 770 installed in the hot air duct 750.

The hot air duct 750 is connected to the upper center of the combustion member 600, and the hot air duct 750 serves to recover the combustion gas. 4, the hot air duct 750 is formed to be long in the longitudinal direction at the upper part of the room in a state connected to the upper center of the shutoff lid 690, and a hot air duct 750 is installed in the shutoff lid 690, And a recovery hole 692 communicating with the duct 750 is formed.

As shown in FIG. 4, a plurality of the discharge ports 760 are installed at appropriate intervals in the hot air duct 750, and the plurality of discharge ports 760 discharge hot air for heating to the room.

The suction fan 770 is installed in the hot air duct 750 and the suction fan 770 serves to introduce the combustion gas into the hot air duct 750.

5, a space is formed between the insertion hole 611 of the stationary disk 610 and the gas discharge pipe 500 to allow external air to flow thereinto. In this case, according to another embodiment as shown in FIG. 5, it is preferable not to install the guide 680 for guiding the combustion gas downward.

The gas supply pipe 800 supplies ammonia gas, nitrogen gas, and carbon dioxide gas into the port 200, and the gas supply pipe 800 is connected to the lower center of the port 200.

According to the present invention, 70% of ammonia gas, 20% of nitrogen gas and 10% of carbonic acid gas are supplied to the interior of the port 200 to heat-treat the metal mold at a temperature of 550 to 580 ° C.

When ammonia gas, nitrogen gas and carbonic acid gas are supplied to the interior of the port 200 and the metal mold is heat-treated at a temperature of 550 to 580 ° C, nitrogen diffuses to the surface of the metal mold, Is high and the hardness distribution is good and a nitride layer free of microcracks is formed.

The heat treatment using the present invention can simplify the structure of the heat treatment apparatus, shorten the time, prevent microcracks, improve the surface hardness and wear resistance, and prolong the life of the metal mold.

6 shows another embodiment of the present invention in which the hot air ducts 720 and 750 of the recycling member 700 are provided with a heat exchange tube 781 embedded in the heat exchange tube 780, A cold water supply pipe 782 having valves 782a and 783a is connected to a hot water recovery pipe 783 and a safety net 784 is installed outside the heat exchange pipe 780 do.

6, the cold water is supplied to the heat exchanger 780 through the cold water supply pipe 782, and the cold water supplied to the heat exchanger 780 flows through the heat exchanger 781, And the hot water heated by the heat exchange pipe 781 is supplied to the hot water use place through the hot water return pipe 783. [ therefore. According to another embodiment of the present invention, hot water during operation of the mold heat treatment apparatus can be used.

7 shows another embodiment of the present invention in which the hot air ducts 720 and 750 of the recycling member 700 are provided with a heat exchange tube 791 built in the heat exchange tube 790, A heat storage material 792 is filled in the heat exchanger 790 and a safety net 793 is installed outside the heat exchanger 790.

7, since the heat accumulating material 792 is filled in the heat exchanging cylinder 790, the heat accumulated in the heat accumulating material 792 even after the operation of the mold heat processing apparatus is stopped, The hot air for heating can be discharged into the room while supplying the air to the discharge ports 730 and 760 for a predetermined time.

8 shows another embodiment of the present invention in which the hot air ducts 720 and 750 of the recycling member 700 are provided with a heat exchange tube 791 built in the heat exchange tube 790, A heat accumulation material 792 is filled in the heat exchanger 790 and a safety net 793 is installed outside the heat exchanger 790. The hot air ducts 720 and 750 of the recycling member 700 are connected to the heat exchanger A cold water supply pipe 782 having valves 782a and 783a and a hot water return pipe 783 are connected to the heat exchange pipe 780, And a safety net 784 is installed outside the cylinder 780.

8, since the heat accumulating material 792 is filled in the heat exchanging cylinder 790, the heat accumulated in the heat accumulating material 792 even after the operation of the mold heat processing apparatus is stopped, The hot air for heating can be discharged into the room while supplying the air to the discharge ports 730 and 760 for a predetermined time. 8, according to another embodiment of the present invention, the cold water is supplied to the heat exchanger 780 through a cold water supply pipe 782, and the cold water supplied to the heat exchanger 780 is supplied to the heat exchanger 781 and the hot water heated by the heat exchanging tube 781 is supplied to the place where the hot water is used through the hot water return pipe 783. Therefore, even after the heat treatment apparatus is stopped, Hot water can be used for a certain period of time.

The overall operation of the present invention will now be described in detail.

The lid 300 is opened and the product 10 such as a mold or a tool to be heat treated is inserted into the port 200 through the basket 240 and the lid 300 is closed and then the heater 400 is operated The port 200 is heated to a temperature of 550 to 580 캜 and the interior of the port 200 is supplied with 70% ammonia gas, 20% nitrogen gas and 10% carbon dioxide gas through a gas supply pipe 800 And the blower fan 310 installed in the lid 300 are operated to create an internal air flow of the port 200. [ At this time, the heater 650 of the combustion member 600 is operated to heat the inner cylinder 620 to a temperature of 800 ° C, and the suction fans 740 and 770 of the recycle member 700 are operated.

Nitrogen gas and carbonic acid gas are supplied to the interior of the port 200 and the product 01 is heat-treated at a temperature of 550 to 580 ° C., nitrogen diffuses to the surface of the product 10, It forms a nitrided layer with dense surface, high surface hardness, good hardness distribution and no microcracks.

The harmful waste gas generated in the port 200 during the heat treatment of the product 10 is discharged to the inner cylinder 620 of the combustion member 600 through the gas discharge pipe 500 and discharged to the inner cylinder 620 The waste gas exhausted to the gas exhaust holes 621 is removed while being burned by the heat of 800 DEG C heated by the heater 650 The combustion gas generated during the combustion is discharged to the atmosphere through the discharge hole 671 of the lid 670. At this time, outside air flows in through the air inflow hole 672 of the lid 670 so that combustion of the harmful waste gas is smoothly performed, and the flame generated in the combustion is prevented from being diffused upward by the blocking lid 690 .

1 and 4, some of the combustion gases generated when the harmful waste gas is burned in the combustion member 600 are blown into the hot air ducts 740 and 740 by the suction fans 740 and 770 of the recycling member 700, 720 and 750 and the combustion gas sucked into the hot air ducts 720 and 750 is discharged into the room through a plurality of discharge ports 730 and 760 to supply hot air for heating.

Accordingly, since the present invention is provided with the combustion member 600 for burning and removing the harmful waste gas in the gas discharge pipe 500, the harmful waste gas generated during the heat treatment of the mold structurally can be easily treated and removed, It is possible to prevent environmental pollution and pollution problems due to the release of untreated harmful waste gas to the atmosphere.

In addition, since the recycling member 700 that recovers the combustion gas generated in the combustion of the harmful waste gas and supplies it to the room by the hot air for heating is provided in the combustion member 600, the present invention can prevent the harmful waste gas generated during the heat treatment of the mold structurally The combustion gas can be recovered and recycled as hot air for heating, thus saving energy economically.

In the present invention, ammonia gas, nitrogen gas and carbonic acid gas are supplied to the interior of the port 200 to form a nitrided layer which is dense on the surface of the metal mold and has a high surface hardness, a good hardness distribution and no microcracks , It has the advantage of improving the life of the mold structurally.

100: Heat treatment furnace 110: Refractory brick
120: Insulation material 200: Port
300: cover 310: blowing fan
400: heater 500: gas discharge pipe
600: combustion member 610: fixed disk
620: inner tube 621: gas exhaust ball
630: outer tube 640: insulation
650: heater 660: sensor
670: Lid 671: Exhaust hole
672: Air inflow ball 680: Guide
690: Block valve 700: Recycle member
710: Combustion gas recovery cylinder 711:
712: exhaust path 720: hot air duct
730: Discharge port 740: Suction fan
750: hot air duct 760: outlet
770: Suction fan 780: Heat exchanger
781: heat exchange tube 782: cold water supply tube
782a: valve 783: hot water recovery pipe
783a: valve 784: safety net
790: Heat exchange cylinder 791: Heat exchange tube
792: Heat storage material 793: Safety net
800: gas supply pipe

Claims (9)

A heat treatment furnace (100) comprising an upper portion made of refractory bricks (110) and a heat insulating material (120); A port 200 opened at an upper portion of the heat treatment furnace 100, A lid 300 having a blowing fan 310 installed at an upper portion of the port 200 so as to open and close the port 200 to form an internal air flow of the port 200; A heater 400 installed on an inner wall of the heat treatment furnace 100 to heat a port 200 containing a metal mold; A gas discharge pipe (500) installed in the lid (300) and discharging harmful waste gas; A combustion member 600 installed at an upper portion of the gas discharge pipe 500 for burning and removing waste gas discharged therefrom; And a recycling member (700) for recovering the combustion gas generated in the combustion of the waste gas of the combustion member (600) and supplying the combustion gas as hot air for heating,
The combustion member 600 is fixed to the fixed disk 610 so as to enclose the upper portion of the gas discharge pipe 500 in a spaced apart relationship with the fixed disk 610 fixed to the upper portion of the gas discharge pipe 500 An outer cylinder 630 disposed on the outer side of the inner cylinder 620 and fixed to the fixed cylinder 610 and an outer cylinder 630 fixed to the outer cylinder 630. The inner cylinder 620 includes a plurality of gas exhaust holes 621, A heater 650 installed in the inner periphery of the heat insulating material 640 so as to be separated from the inner cylinder 620 to burn waste gas and a heater 650 installed in the outer cylinder 630, A sensor 660 for sensing the temperature of the heater 650 and a discharge hole 671 for discharging the combustion gas into the atmosphere and spaced apart from the upper portion of the inner tube 620 at an upper portion of the outer tube 630, A lid 670 provided with an inlet hole 672 and a guide 680 installed at a lower portion of the lid 670 to guide the combustion gas downward, , The mold heat treatment apparatus having a waste gas combustion and recycle function, characterized in that the block consisting of freshly 690, which is installed in a state of being spaced apart on top of the lid 670. delete The apparatus of claim 1, wherein the heater (650) is embedded in the inner surface of the refractory (651) to burn off the waste gas at a temperature of 800 ° C. The exhaust gas recycling apparatus according to claim 1, wherein the recycling member (700) is connected to a lower center of the combustion member (600) and includes a recovery path (711) for recovering combustion gas and an exhaust path (712) A hot air duct 720 connected to a lower portion of the combustion gas recovery cylinder 710 to communicate with the exhaust passage 712 and a hot air duct 720 installed in the hot air duct 720 to discharge hot air into the room A plurality of discharge ports (730), and a suction fan (740) installed in the hot air duct (720). The air conditioner according to claim 1, wherein the recycling member (700) comprises a hot air duct (750) connected to the upper center of the combustion member (600) And a suction fan (770) installed in the hot air duct (750). The apparatus as set forth in claim 1, further comprising: The apparatus of claim 1, further comprising a gas supply pipe (800) for supplying ammonia gas, nitrogen gas, and carbon dioxide gas into the port (200). 7. The method according to claim 6, wherein 70% ammonia gas, 20% nitrogen gas, and 10% carbon dioxide gas are supplied to the interior of the port (200) to heat the metal mold at a temperature of 550 to 580 캜 A mold heat treatment apparatus having a waste gas combustion and recycling function. The recycling device according to claim 4 or 5, wherein the hot air ducts (720) and (750) of the recycling member (700) are provided with a heat exchange tube (781) embedded in the heat exchange tube (780) Wherein a cold water supply pipe 782 having valves 782a and 783a is connected to a hot water return pipe 783 and a safety net 784 is installed outside the heat exchange pipe 780. [ And a heat treatment device for heating the mold. The recycling device according to claim 4 or 5, wherein the hot air ducts (720) and (750) of the recycling member (700) are provided with a heat exchange tube (791) embedded in the heat exchange tube (790) Wherein a heat storage material (792) is filled in the inside of the heat exchanger (710), and a safety net (793) is installed outside the heat exchange cylinder (790).
KR1020150177009A 2015-12-11 2015-12-11 Mold heat processor of noxious gas combustion and recycling function having KR101600576B1 (en)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109539815A (en) * 2018-12-27 2019-03-29 南昌工程学院 A kind of high-temperature hot-air device that the waste gas circulation suitable for brickkiln heats
KR102201666B1 (en) * 2020-02-27 2021-01-12 (주)한국이엔이 Catalytic apparatus

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR930003031B1 (en) * 1989-07-10 1993-04-16 다이또오산소 가부시끼가이샤 Method of nitriding steel
KR940001345B1 (en) 1991-11-21 1994-02-19 임태균 Heat treatment furnace of ferrous materials
JP2015014420A (en) * 2013-07-05 2015-01-22 三菱電機株式会社 Thermal treatment equipment

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR930003031B1 (en) * 1989-07-10 1993-04-16 다이또오산소 가부시끼가이샤 Method of nitriding steel
KR940001345B1 (en) 1991-11-21 1994-02-19 임태균 Heat treatment furnace of ferrous materials
JP2015014420A (en) * 2013-07-05 2015-01-22 三菱電機株式会社 Thermal treatment equipment

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109539815A (en) * 2018-12-27 2019-03-29 南昌工程学院 A kind of high-temperature hot-air device that the waste gas circulation suitable for brickkiln heats
CN109539815B (en) * 2018-12-27 2024-02-27 南昌工程学院 High-temperature hot air device suitable for waste gas circulation heating of brickkiln
KR102201666B1 (en) * 2020-02-27 2021-01-12 (주)한국이엔이 Catalytic apparatus

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