KR101581164B1 - Device for preventing steel product from being chopped in quenching apparatus - Google Patents

Device for preventing steel product from being chopped in quenching apparatus Download PDF

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Publication number
KR101581164B1
KR101581164B1 KR1020150125828A KR20150125828A KR101581164B1 KR 101581164 B1 KR101581164 B1 KR 101581164B1 KR 1020150125828 A KR1020150125828 A KR 1020150125828A KR 20150125828 A KR20150125828 A KR 20150125828A KR 101581164 B1 KR101581164 B1 KR 101581164B1
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KR
South Korea
Prior art keywords
steel product
discharge pipe
tank
heating furnace
primary heating
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Application number
KR1020150125828A
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Korean (ko)
Inventor
정영무
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정영무
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Priority to KR1020150125828A priority Critical patent/KR101581164B1/en
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    • 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
    • C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
    • C21D1/62—Quenching devices
    • 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
    • C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
    • C21D1/62—Quenching devices
    • C21D1/63—Quenching devices for bath quenching
    • 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
    • C21D9/0006—Details, accessories not peculiar to any of the following furnaces
    • 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
    • C21D9/0006—Details, accessories not peculiar to any of the following furnaces
    • C21D9/0025—Supports; Baskets; Containers; Covers
    • 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
    • C21D9/0062—Heat-treating apparatus with a cooling or quenching zone
    • 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

Abstract

More particularly, the present invention relates to an apparatus for preventing hot stamping of a steel product in a heat treatment apparatus, and more particularly, to a method for annealing a steel product by annealing or normalizing the steel product in a process of heat treating a steel product comprising various industrial machine parts such as forgings of automobile parts. The present invention relates to a device for preventing the stamping of a steel product in a heat treatment apparatus for preventing the stamping (damage) caused by falling impact in the process of being transferred to a stamping process, thereby enhancing the product completeness and prolonging the life of the product.

Description

TECHNICAL FIELD [0001] The present invention relates to a device for preventing hot stamping of a steel product,

More particularly, the present invention relates to an apparatus for preventing hot stamping of a steel product in a heat treatment apparatus, and more particularly, to a method for annealing a steel product by annealing or normalizing the steel product in a process of heat treating a steel product comprising various industrial machine parts such as forgings of automobile parts. The present invention relates to a device for preventing the stamping of a steel product in a heat treatment apparatus for preventing the stamping (damage) caused by falling impact in the process of being transferred to a stamping process, thereby enhancing the product completeness and prolonging the life of the product.

In general, the heat treatment is a heating and cooling operation at a suitable temperature to improve various mechanical properties such as strength, hardness, abrasion resistance and impact resistance required for metal or alloy materials, It is used for quality improvement.

The heat treatment is a general heat treatment for improving the brittleness generated during the processing of metal parts according to the processing method, preventing distortion and crack due to the difference in cooling speed between the surface and the inside of the part and reducing the residual stress, Special heat treatment to increase the hardness of the parts, surface hardening heat treatment to harden the surface of the parts and maintain the toughness of the inside.

Among them, the general heat treatment is annealing which anneals at a certain temperature and then slowly cools down to soften the material or to remove internal stress, anneals slightly faster in the air in order to increase the strength by refining the crystal grains and to make the material uniform. Normalizing to increase the hardness of the metal, quenching quenched from above the critical temperature to increase the hardness of the metal, stabilize the texture of the hardened metal and heat hold and cool to a suitable temperature to impart toughness to the material And tempering or the like.

Conventionally, by such a heat treatment method, it is required to provide a hardness, abrasion resistance, cracking resistance, processability, and other properties to industrial machinery parts, especially forgings of automobile parts such as gears, to improve stability and realize high fuel consumption and low noise. Property.

For example, in order to heat a forged product of an automobile part, a part such as a gear, a yoke, and a joint is annealed after forging to remove the internal stress generated by forging by soft pearlite formation , Or homogenizing the structure and components by a normalizing process, eliminating the internal stress due to forging and improving the mechanical properties such as ductility, and then improving the strength and hardness of the component through a quenching process, After the heat treatment is performed by a stepwise heat treatment method for imparting toughness, the dimensions of the parts are finally adjusted by the polishing process.

The construction of such a heat treatment furnace will be briefly described. A conveyor is disposed between the inside of the heat treatment furnace and the heat treatment furnace so as to feed and continuously supply the forged product, and a forged product that is discharged after heating in an annealing furnace or a normalizing furnace (primary heating furnace) A heat exchanger tank is disposed between the primary heating furnace and the tempering furnace so as to cool the heat exchanger, and the heat exchanger is disposed at the lower side of the outlet of the primary heating furnace, And is configured to be moved into the inside tank tank.

At this time, when the forged product is discharged from the primary heating and falling down to the heat treatment fluid in the tank, the metal forged product having a weight higher than a certain level may hit the conveyor at the bottom of the tank, .

Particularly, parts such as gears are required to have properties such as abrasion resistance and impact resistance, but also have to be precisely bonded to other parts in a state in which the shape is precisely machined. Therefore, due to such damage, There is also concern that it may lead to the occurrence.

Korean Patent Registration No. 1199694 entitled "Deformation prevention device for vehicle interior parts" (2012.11.02) "Coreshooting prevention device" of Korean Utility Model Registration No. 58115 (July 30, 1991) Korean Patent Registration No. 1419394 entitled " Device for preventing plate stamping "

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and it is an object of the present invention to provide a method of heat treating a steel product comprising various industrial machine parts such as forgings of automobile parts, To prevent the steel plate from falling due to the falling of the steel plate, thereby increasing the degree of completion of the steel plate and extending the service life of the steel plate.

In order to accomplish the above object, the apparatus for preventing the stamping of steel products according to the present invention comprises a primary heating furnace for heating softening of a steel product and for removing internal stresses, a steel product heated in the primary heating furnace A tempering furnace which reheats the steel product cooled in the heating tank so as to impart toughness and a conveyor for conveying and continuously supplying the steel product through the inside thereof, A discharge pipe installed perpendicularly to an outlet of the primary heating furnace so as to communicate with the inside of the heating tank; And a plurality of injection nozzles provided on at least one wall surface of the discharge pipe for spraying oil toward the steel product discharged through the discharge pipe, Thereby relieving the falling impact of the product.

Also, the buffer means may include a frame portion fixedly installed in the inside of the tank to be located in a direction directly under the discharge pipe; And a buffer plate of an elastic material formed on the upper portion of the frame so as to be in contact with a steel product falling through the discharge pipe.

At this time, the buffer plate is formed in a stepped side cross-sectional shape so that a plurality of ends are spaced apart from each other by a predetermined distance and the vertical drop width of the steel product decreases as it goes down to the bottom, or the buffer plate is formed as one end, Sectional shape so as to narrow the vertical drop width of the protruding portion.

The buffer means further includes a buffer spring provided on the bottom surface of the frame portion to further mitigate a falling impact of the steel product.

Further, the buffer means includes a blowing fan mounted on at least one wall surface of the inside of the tank to be adjacent to the frame portion.

As described above, according to the apparatus for preventing hot stamping of a steel product in the heat treatment apparatus of the present invention, when a forged steel product, which is discharged from a heating furnace in a primary heating furnace, is moved downward into a steel tanks for cooling, So as to prevent damage such as being stuck on the surface of the forged steel product, thereby improving the quality of the finished product. Further, it is possible to improve the quality of finished products such as automobiles to which such forged steel products are applied It has the advantage of being.

1 is a view schematically showing a heat treatment process;
2 is a cross-sectional view showing the breakage prevention device of the present invention
3 is a view showing a drop buffering means according to the present invention;
4 is a side view schematically showing another embodiment of the buffer plate according to the present invention
5 is a side view schematically showing another embodiment of the buffer plate according to the present invention

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings so that those skilled in the art may easily implement the technical idea of the present invention. However, the present invention may be embodied in various different forms and is not limited to the embodiments described herein.

FIG. 1 is a view schematically showing a heat treatment process, FIG. 2 is a cross-sectional view showing a breakage prevention apparatus of the present invention, and FIG. 3 is a view showing a drop buffering means according to the present invention.

The quenching / tempering process is performed for improving the mechanical properties and durability of forged steel products for automobile parts as described above. The quenching / tempering process is a process for austenitizing a forged product in a primary heating furnace, , The steel is quenched in a quenching tank to secure its strength, the brittleness due to the quenching is removed in the tempering furnace, and toughness is imparted to ensure hardness in accordance with the characteristics of the product. The present invention relates to an apparatus for preventing the problems such as the occurrence of being shot by impact due to a free fall during the transfer from the primary heating furnace to the quenching tank in the process of entering the Q / T process.

According to the drawings, an apparatus (D) for preventing the stamping of a steel product in a heat treatment apparatus according to the present invention is provided with a cushioning buffer which is provided between a discharge port of a primary heating furnace and a shaking tank, And means.

This will be described in detail as follows.

In the present invention, the primary heating furnace 100, the heating tank 200, the tempering furnace 300, and the conveyor 400 are the same as known ones, and a detailed description thereof will be omitted.

The discharge pipe 10 is formed to have a predetermined size and is provided in a vertical direction so as to communicate with the discharge port of the primary heating furnace 100 and the inside of the boiling tank 200 and is made of a forged steel product such as gears heat treated in the primary heating furnace It forms a passage that moves into the tank.

At this time, heat treatment oil 200a is stored in the heating tank 200, so that the forged steel product s discharged and falling from the primary heating furnace 100 is quenched.

The buffering means is installed between the primary heating furnace and the heating tank so as to mitigate the falling impact of the forged steel product s falling onto the conveyor belt in the heating tank 200 discharged from the primary heating furnace 100 .

The buffer means includes a plurality of injection nozzles and an injection pump.

The injection nozzle 11 is connected to at least one of the discharge pipes 10 so as to discharge oil from the discharge port of the primary heating furnace 100 and to inject oil into the discharge pipe 10, A large number is installed on one inner wall surface.

The injection nozzle 11 is rotatably installed in all directions or inclined upward so as to delay the vertical falling speed of the forged steel product passing through the discharge pipe 10.

The injection pump (not shown) is installed at a peripheral portion such as the outside of the equating tank 200 and supplies the oil to the injection nozzle 11, and a pipe 11a for connecting them is provided for this purpose.

At this time, the oil used is the same as the heat treatment oil stored in the quenching tank 200 for cooling the forged steel product (s).

The buffer means further includes a frame portion and a buffer plate.

The frame part 12 is formed to have a predetermined height and a predetermined size and fixed to the inside of the lighting tank 200 to serve as a frame for supporting the buffer plate 13 at a predetermined height. .

The frame part 12 is made of a metal material and is made of a synthetic resin film such as polyvinyl chloride or a coating material for metal coating so as not to be corroded by the acidic substance generated by the deterioration of the heat- It is preferable that the coating is treated.

It is preferable that the frame portion is located directly below the discharge pipe 10 and its sectional area is larger than the discharge pipe 10.

The buffer plate 13 is made of an elastic material such as urethane rubber and is formed at an upper portion of the frame portion so as to be inclined so as to absorb falling impact of the forged steel product s falling from the discharge pipe.

The buffer plate 13 may be formed of a single stage or a plurality of stages vertically spaced apart from each other.

At this time, when the buffer plate 13 is formed of a plurality of stages, it is preferable that the buffer plates 13 are installed so as to intersect with each other. That is, the buffer plates of the first stage are installed on both the front and rear sides (the traveling direction of the conveyor) of the frame portion, and the buffer plates of the second stage are installed on the left and right sides of the frame portion (both edge directions of the conveyor) .

4, the buffer plate 13 is formed on at least both sides of the frame 12 as shown in FIG. 4. However, the buffer plate 13 has a longer length as it goes down to the lower end so as to have a stepped shape when viewed from the side It is possible.

As shown in FIG. 5, the buffer plate 13 may have a single end and may be formed on at least both sides of the frame portion, but may have a zigzag shape when viewed from the side.

Although not shown in the drawing, a blowing fan is mounted at a position adjacent to the frame portion 12 on at least one wall surface of the inside of the equalizing tank 200 to rotationally drive the blowing fan by a motor, (Heat-treated oil) is circulated to induce the steel product to fall slowly.

Such a blower fan is positioned above the buffer plate 13. [

In addition, the buffer means further includes a buffer spring.

The buffer spring 14 is provided on the bottom surface of the frame portion 12 to further mitigate the falling impact of the forged steel product. At this time, the buffer spring 14 preferably uses a non-metallic spring such as a rubber spring or a synthetic resin spring. However, the present invention is not limited to this, but a metallic spring whose surface is coated may be used.

10: discharge pipe 11: injection nozzle
12: frame part 13:
14: Buffer spring D: Shock prevention device

Claims (6)

A primary heating furnace (100) for heating the steel product so as to remove softening and internal stress of the steel product, a quench tank (200) for quenching so as to increase the strength of the steel product heated in the primary heating furnace, A tempering furnace 300 for reheating the steel product to impart toughness to the steel product cooled in the heating device 300, and a conveyor 400 for conveying and continuously supplying the steel product through the inside thereof,
A discharge pipe 10 installed perpendicularly to a discharge port of the primary heating furnace so as to communicate with the inside of the flashing tank 200; And a buffering means installed adjacent to the discharge pipe to mitigate a falling impact of a steel product discharged from the primary heating furnace to a steel tank,
The buffer means may comprise:
A plurality of spray nozzles (11) installed on at least one wall surface of the discharge pipe to spray oil toward the steel product discharged through the discharge pipe;
A frame part 12 fixedly installed in the inside of the tank 200 so as to be positioned directly below the discharge pipe;
A buffer plate (13) formed of an urethane rubber and inclined at an upper portion of the frame portion so as to contact a steel product falling through the discharge pipe;
A buffer spring (14) provided on a bottom surface of the frame portion to further mitigate a falling impact of the steel product; And
And a blowing fan mounted on at least one wall surface of the inside of the equalizing tank so as to be adjacent to the frame part. delete The method according to claim 1,
Wherein the buffer plate (13) is formed in a stepwise side cross-sectional shape such that a plurality of ends thereof are spaced apart from each other by a predetermined distance, and the vertical drop width of the steel product decreases as it goes downward. The method according to claim 1,
Wherein the buffer plate (13) is formed in a single step, and is formed in a zigzag shape so that the vertical drop width of the steel product becomes narrower toward the lower side. delete delete
KR1020150125828A 2015-09-04 2015-09-04 Device for preventing steel product from being chopped in quenching apparatus KR101581164B1 (en)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112522484A (en) * 2020-12-29 2021-03-19 湖南飞沃新能源科技股份有限公司 Blanking structure and quenching cooling mechanism
CN114799782A (en) * 2022-04-12 2022-07-29 乐清市芙蓉工具一厂 Machining equipment for drill bit

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5447293A (en) * 1994-07-22 1995-09-05 Clarke; Beresford N. Method and apparatus for quenching heat treated objects
KR101199694B1 (en) 2010-08-31 2012-11-08 한일이화주식회사 Deformation preventing device of a automobile inner element
KR101419394B1 (en) 2012-11-21 2014-07-14 주식회사 포스코 Apparatus for preventing plate from being chopped and plate guidance apparatus having the same

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5447293A (en) * 1994-07-22 1995-09-05 Clarke; Beresford N. Method and apparatus for quenching heat treated objects
KR101199694B1 (en) 2010-08-31 2012-11-08 한일이화주식회사 Deformation preventing device of a automobile inner element
KR101419394B1 (en) 2012-11-21 2014-07-14 주식회사 포스코 Apparatus for preventing plate from being chopped and plate guidance apparatus having the same

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
한국 실용신안등록 제58115호의 "코어찍힘방지장치" (1991.07.30)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112522484A (en) * 2020-12-29 2021-03-19 湖南飞沃新能源科技股份有限公司 Blanking structure and quenching cooling mechanism
CN114799782A (en) * 2022-04-12 2022-07-29 乐清市芙蓉工具一厂 Machining equipment for drill bit

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