KR102110574B1 - Device for metal product heat treatment - Google Patents

Abstract

The present invention is a metal product heat treatment apparatus for heat treatment of a metal product for a predetermined target temperature and a predetermined target time, the lower housing having a rectangular interior space; An upper housing located above the lower housing and having an internal space in communication with a portion of the lower housing; A transfer part located in the inner space of the lower housing; A heat treatment part located on an upper portion of the upper housing and applying heat to a metal product; A heating chamber including a portion of the inner space of the lower housing and a portion of the inner space of the upper housing, wherein the metal product is heat-treated; And a control unit electrically connected to at least one of the transfer unit, the heat treatment unit, and the heating chamber to control an operation.

Description

Heat treatment device for metal products {DEVICE FOR METAL PRODUCT HEAT TREATMENT}

The present invention relates to an apparatus for heat treatment of a metal product.

In general, a device or process in which a metal product is heat-treated by absorbing heat from a heating device while the metal product passes the conveyor belt is used by placing a heating device and a conveyor belt in the housing to heat-treat (tampering, annealing, annealing) the metal product. have.

However, in the conventional heat treatment device, there is a problem in that the amount of heat transferred to the metal product differs depending on the shape of the metal product or at which point the metal product is located and transported on the conveyor belt, so that the defect rate of the final product is very high. .

In the situation where the demand for metal products increases rapidly with the development of the automobile industry, shipbuilding industry, etc., there is a need for a technique to improve the productivity of metal products by solving the above problems.

Korean Patent Publication No. 10-1993-0010200 (1993.06.22)

The present invention is to solve the problems of the prior art described above, the present invention is to uniformly form the heat distribution in the heating chamber, a space where the metal product is heat-treated, and to maintain the temperature in the heating chamber to a target value through feedback control Provide a device.

In order to achieve the above object, the present invention is a metal product heat treatment apparatus for heat treatment of a metal product for a predetermined target temperature and a predetermined target time, the lower housing having a rectangular interior space; An upper housing located above the lower housing and having an internal space in communication with a portion of the lower housing; A transfer part located in the inner space of the lower housing; A heat treatment part located on an upper portion of the upper housing and applying heat to a metal product; A heating chamber including a portion of the inner space of the lower housing and a portion of the inner space of the upper housing, wherein the metal product is heat-treated; And a control unit electrically connected to at least one of the transfer unit, the heat treatment unit, and the heating chamber to control an operation.

In one embodiment, the transfer unit, the supply-side roller for rotational driving on the supply side of the metal product; A discharge-side roller that rotates on the discharge side of the metal product; A belt member formed to surround the outer circumference of the supply-side roller and the discharge-side roller by forming a single closed curved surface; And an auxiliary roller positioned below the belt member to support the load of the belt member and to provide an auxiliary tension.

In one embodiment, the heat treatment portion, a heating part that extends inside the heating chamber to generate heat inside the heating chamber; And it may be a heat treatment device for a metal product, characterized in that it comprises a heat dissipation portion that performs a heat dissipation action between the inner upper surface of the heating chamber and the heating portion.

In one embodiment, the heat treatment unit may be a metal product heat treatment device comprising a thermocouple that measures the temperature in the heating chamber and converts it into an electrical signal and transmits it to the control unit.

In one embodiment, the heat treatment unit may be a metal product heat treatment apparatus characterized in that when the temperature in the heating chamber is lower than a target temperature through feedback control with the control unit, the heat generation amount is increased.

In one embodiment, the heat treatment unit may be a metal product heat treatment apparatus characterized in that, when the temperature in the heating chamber is higher than a target temperature through feedback control with the control unit, the heat generation amount is reduced.

In one embodiment, the heat treatment unit includes a heat dissipation unit for dispersing heat in the heating chamber, and the heat dissipation unit is located at an upper side of the upper housing to generate a driving force, and from the driving unit, inside the heating chamber It may be a heat treatment device for a metal product, characterized in that it comprises a drive shaft extending to, and a heat dissipation fan connected to one end of the drive shaft to be rotationally driven.

In one embodiment, the thermocouple may be a heat treatment device for a metal product characterized in that it is located at a predetermined distance from the heat dissipating portion toward the driving direction of the belt to measure the temperature in the heating chamber in real time.

In one embodiment, the heat dissipation fan may be a metal product heat treatment device, characterized in that located above the heat generating portion.

In one embodiment, the inner wall of the heating chamber includes a heat radiation layer that radiates heat into the heating chamber and a heat insulating layer that blocks heat transfer inside and outside the heating chamber. It can be a device.

In one embodiment, it may be a metal product heat treatment apparatus characterized in that it comprises a discharge-side cooling unit for re-cooling the metal product after the heat treatment is completed on the discharge side of the metal product.

According to an embodiment of the present invention, a metal product is heat treated while maintaining a predetermined target temperature and a predetermined target time, thereby significantly reducing the defect rate of the metal product and improving productivity.

In addition, heat is evenly distributed into the heating chamber so that heat is uniformly transferred to all areas of the metal product regardless of the shape of the metal product being heat-treated while passing through the interior of the heating chamber or the location at the time of passage, thereby reducing the defect rate of the metal product. It can significantly reduce and improve productivity.

It should be understood that the effects of the present invention are not limited to the above-described effects, and include all effects deducible from the configuration of the invention described in the detailed description or claims of the present invention.

1 is a schematic side view showing a longitudinal direction of a metal product heat treatment apparatus according to an embodiment of the present invention.
Figure 2 is a schematic view of the other side showing the width direction of the metal product heat treatment apparatus according to an embodiment of the present invention.
3 is a schematic view of a metal product heat treatment apparatus according to an embodiment of the present invention as viewed from above.
Figure 4 is a schematic view showing the inside of the opening and closing of the metal product heat treatment apparatus according to an embodiment of the present invention.
5 is a schematic view showing a heat dissipation fan of a metal product heat treatment apparatus according to an embodiment of the present invention.
6 is a graph showing the temperature change of the center, left and right in the heating chamber of the metal product heat treatment apparatus according to an embodiment of the present invention.
7 is a graph showing a temperature change in a controlled state as a control unit according to an embodiment of the present invention when the phenomenon shown in FIG. 6 occurs.

Hereinafter, the present invention will be described with reference to the accompanying drawings. However, the present invention may be implemented in various different forms, and thus is not limited to the embodiments described herein. In addition, in order to clearly describe the present invention in the drawings, parts irrelevant to the description are omitted, and like reference numerals are assigned to similar parts throughout the specification.

Throughout the specification, when a part is "connected" to another part, this includes not only "directly connected" but also "indirectly connected" with another member in between. . Also, when a part “includes” a certain component, this means that other components may be further provided instead of excluding other components, unless otherwise stated.

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

1 is a schematic side view showing a longitudinal direction of a metal product heat treatment apparatus according to an embodiment of the present invention, Figure 2 is a schematic side view showing the other side of the metal product heat treatment apparatus according to an embodiment of the present invention, Figure 3 is a schematic view of a metal product heat treatment apparatus according to an embodiment of the present invention as viewed from the top, Figure 4 is a schematic view showing the inside of the opening and closing of the metal product heat treatment apparatus according to an embodiment of the present invention, Figure 5 is the present invention It is a schematic diagram showing a heat dissipation fan of a metal product heat treatment apparatus according to an embodiment of the.

1 to 5, the metal product heat treatment apparatus 1000 according to an embodiment of the present invention is the lower housing 100, the upper housing 110, the transfer unit 200, the heat treatment unit 300, heating It includes a chamber 400, a discharge side cooling unit 500 and a control unit 600.

The lower housing 100 may form a body of the metal product heat treatment apparatus 1000 and may have a rectangular interior space.

According to an embodiment, the lower housing 100 has a hollow beam or cylinder-shaped outer support 711 and a shape corresponding to the shape of the outer support 711 and is inserted into the outer support 711. A support portion including a wheel 713 detachably coupled to one end of the inner support portion 712 and the inner support portion 712 can be formed.

In addition, a plurality of such support portions may be formed to support the load of the entire metal product heat treatment apparatus 1000 including the lower housing 100 and to adjust the height from the ground to the lower housing 100.

The upper housing 110 may be located above the lower housing 100 and may have an internal space in communication with a portion of the lower housing 100.

The transfer unit 200 may be located in the inner space of the lower housing 100, the supply-side roller 221, the discharge-side roller 222, the belt member 230, the first auxiliary roller 241 and the second auxiliary roller ( 242).

The supply-side roller 221 may be formed to rotate on the supply side of the metal product, and the discharge-side roller 222 may be formed to rotate on the discharge side of the metal product.

Further, the supply-side roller 221 and / or the discharge-side roller 222 may be rotationally driven by applying the driving force of the driving unit 210 supported by the lower housing 100.

The belt member 230 may be formed to surround the outer circumference of the supply-side roller 221 and the discharge-side roller 222 by forming a single closed curved surface.

According to one embodiment, the belt member 230 may be in the form of a mesh having a grid smaller than the size of the metal product, and according to another embodiment, the belt member 230 is a form in which a plurality of rectangular plates are connected, and From the supply side to the discharge side, a gap may not be generated between the plurality of plates.

Thus, the metal product positioned on the belt member 230 interferes with the belt member 230 during the heat treatment process, thereby causing defects, or malfunction or stoppage of the entire metal product heat treatment apparatus 1000 is prevented.

The auxiliary rollers may be formed in plural like the first auxiliary roller 241 and the second auxiliary roller 242, and are located below the belt member 230 to support the load of the belt member 230 and to apply auxiliary tension. Can provide.

As a result, the weight of the metal product that can be accommodated by the belt member 230 can be increased, and a decrease in tension of the belt member 230 can be prevented even for a long operation.

The heat treatment unit 300 may be located on the upper portion of the upper housing 110 and applies heat to the metal product.

According to an embodiment of the present invention, the heat treatment part 300 includes a heating part that partially extends inside the heating chamber to generate heat inside the heating chamber 400.

According to an embodiment, a plurality of heating units may be provided, and may be continuously formed as the first heating unit 310 and the second heating unit 340 in a direction parallel to the traveling direction of the belt member 230.

As shown in FIG. 4, according to an embodiment of the present invention, the heat generating units 310 and 340 may have a “U” shape or an “S” shape continuously arranged at predetermined intervals, or a “U” shape It may be a shape or a shape arranged continuously so that the head-tails of the "S" shape are connected.

Since the first heating unit 310 and the second heating unit 340 are continuously arranged along the traveling direction of the belt member 230, the first heating unit width interval d1 and the second heating unit width interval d2 ), The length of the first heat generating portion (l1) and the length of the second heat generating portion (l2) can be adjusted to optimize heat transfer into the heating chamber 400.

More specifically, the first heating unit 310 may be provided close to the supply side, and the second heating unit 340 may be provided close to the discharge side.

When the direction parallel to the traveling direction of the belt member 230 is the longitudinal direction, orthogonal to the longitudinal direction, but the direction parallel to the ground is called the width direction,

The first heating part width interval d1 which is the width interval of the first heating part 310 on the supply side is smaller than the second heating part width interval d2 which is the width interval of the second heating part 340 provided on the discharge side, or It can be formed in the same way.

In addition, the length 1 of the first heating unit 1 may be formed to be greater than or equal to the length 1 of the second heating unit.

For this reason, the metal product entering from the supply side can reach the target temperature in a shorter time, and the metal product exiting the discharge side can reach the outdoor temperature more quickly, thereby improving the efficiency of heat treatment.

According to an embodiment of the present invention, the heat treatment part 300 includes a heat dissipation part that performs a heat dissipation action between the inner upper surface of the heating chamber 400 and the heating parts 310 and 340.

The heat dissipation unit may be formed to correspond to the number of heat generating units 310 and 340, and as an example, the first heat dissipation unit 320 and the second heat dissipation in a direction parallel to the traveling direction of the belt member 230. It may be formed continuously as the portion 350.

The heat dissipation units 320 and 350 are located on the upper side of the lower housing 100 to generate driving force from the driving units 321 and 351 and the driving shafts 322 extending from the driving units 321 and 351 into the heating chamber 400. 352), and heat dissipation fans 323 and 353 connected to one end of the drive shafts 322 and 352 to be rotationally driven.

In one embodiment, the heat dissipation fans 323 and 353 may be located above the heat generating parts 310 and 340. Thus, a heat dissipation action may be made between the inner upper surface of the heating chamber 400 and the heating units 310 and 340.

If the shape of the heat dissipation fan 323 among the heat dissipation fans 323 and 353 is described with reference to FIG. 5, in one embodiment, the heat dissipation fan 323 includes a base plate 323p, a boss portion 323h, and And a wing member 323b.

The base plate 323p may have a substantially circular thin plate shape, and direct airflow generated by the wing member 323b downward.

The boss portion 323h may be formed at a substantially central portion of the base plate 323p, and may be a cylinder shape having a predetermined height.

The wing member 323b may be formed so that one side is connected to the boss portion 323h and extends from the boss portion 323h, and the other side is in contact with the base plate 323p. Thus, stability can be maintained during long-term rotational driving.

The wing member 323b may have a propeller shape, and may have various shapes of pitch, skew, and / or rake values.

By rotation of the wing member 323b, airflow is formed from the boss portion 323h to the outer circumferential side, which can be guided by the base plate 323p and transferred to the inside of the heating chamber 400.

Accordingly, heat of the heating units 310 and 340 is distributed inside the heating chamber 400 to form a uniform temperature distribution anywhere inside the heating chamber 400.

Therefore, heat is uniformly transferred to all regions of the metal product regardless of the shape of the metal product or the location at the time of passing through the heating chamber 400, thereby significantly reducing the defect rate of the metal product and improving productivity. I can do it.

According to an embodiment of the present invention, the heat treatment unit 300 includes a thermocouple that measures the temperature in the heating chamber 400 and converts it into an electrical signal to transmit it to the control unit 600.

The thermocouple may also be formed continuously, such as the first thermocouple 330 and the second thermocouple 360 in a direction parallel to the traveling direction of the belt member 230.

According to one embodiment, the thermocouple (330, 360) may be located spaced apart a predetermined distance from the heat dissipation unit (320, 350) to the driving direction of the belt member 230 and measure the temperature in the heating chamber 400 in real time do.

The heat treatment unit 300 may be electrically connected to the control unit 600 to increase the amount of heat generated when the temperature in the heating chamber 400 is lower than the target temperature through feedback control with the control unit 600.

Conversely, the heat treatment unit 300 may reduce the amount of heat generated when the temperature in the heating chamber 400 is higher than the target temperature through feedback control with the control unit 600.

Therefore, the temperature in the heating chamber 400 can be kept constant at the target temperature.

Specifically, the thermocouple (330, 360) of the heat treatment unit 300 is electrically connected to the control unit 600, the heating unit (310, 340) is also electrically connected to the control unit 600, the thermocouple (330, 360) When the temperature of the heating chamber 400 measured from is transmitted to the control unit 600 as an electrical signal, the control unit 600 compares this to the target temperature and transmits an electric signal of increasing the heating amount or reducing the heating amount to the heating units 310 and 340 By doing so, the amount of heat generated by the heating units 310 and 340 can be adjusted.

According to an embodiment, the thermocouples 330 and 360 may measure the temperatures of the center, left and right sides in the width direction in the heating chamber 400 and transmit them as electrical signals to the controller 600.

The heating chamber 400 may include a portion of the inner space of the lower housing 100 and a portion of the inner space of the upper housing 110, and may be a space where metal products are heat-treated.

In one embodiment, the inner wall 410 of the heating chamber 400 is a heat radiation layer 411 that radiates heat inside the heating chamber 400 and heat transfer inside the heating chamber 400 and outside the heating chamber 400. And an insulating layer 412 to block.

The control unit 600 may be electrically connected to at least one of the transfer unit 200, the heat treatment unit 300, and the heating chamber 400, and controls their operation.

The temperature deviation in the heating chamber 400 may be caused by a change in the temperature of the heat generating units 310 and 340, the speed of the heat dissipation fans 323 and 353, and the speed of transferring the metal product of the transfer unit 200.

According to an embodiment of the present invention, the control unit 600 is coupled with the temperature of the heating units 310 and 340, the speed of the heat dissipation fans 323 and 353, and the speed of transferring the metal product of the transfer unit 200. By adjusting, it is possible to minimize the temperature deviation in the heating chamber 400 and to make the section in which the target temperature value is maintained throughout the heating chamber 400.

When an example of control of the control unit 600 according to an embodiment of the present invention is described with reference to FIGS. 6 and 7, this test uses a conveyor belt structure as the transfer unit 200, and the transfer speed is 150 mm / min. The heating chamber 400 passing time is 11.47 minutes, the width of the belt member 230 is 410 mm, the length of the heating chamber 400 is 1720 mm, the temperature of the heating units 310 and 340 is 350 ° C., the heat dissipation fan 323, The outer diameter of 353) was performed with 290∮, 6 leaves, and a wingspan of 30mm.

In FIG. 6, the rotational speeds of the heat dissipation fans 323 and 353 are 1800 rpm. In this case, the temperature of the left and right sides is lower than the center from the supply side to a predetermined section, and the temperature hunting phenomenon (a phenomenon that exceeds a predetermined allowable value than the set temperature) ) Occurred, and the section with the temperature deviation within ± 5% was measured as 2 minutes. That is, the temperature deviation of the center, left, and right was applied within ± 5% for only 2 minutes out of 11.47 minutes in the heating chamber 400 passing time.

As described above, when the temperature deviation in the metal product heat treatment apparatus 1000 exceeds a predetermined allowable value, a temperature hunting phenomenon occurs, and / or a length of a section in which the temperature deviation is within ± 5% or more occurs above a predetermined allowable value, the control unit ( 600 may change the temperature of the heat generating parts 310 and 340, the speed of the heat dissipation fans 323 and 353, and / or the speed of conveying the metal product of the conveying part 200.

As an example, in FIG. 7, the rotation speed of the heat dissipation fans 323 and 353 is set to -2200 rpm (reverse direction) from the same state as in FIG. 6 to reduce the temperature deviation, remove the temperature hunting phenomenon, and the temperature temperature deviation The interval within ± 5% was increased to 5 minutes.

The control of the control unit 600 is not limited to this, and as described above, in order to reduce the defect rate according to the production conditions of the metal product, the temperature of the heating units 310 and 340, the speed of the heat dissipation fans 323 and 353, and / Or the coupling of the metal product transfer speed of the transfer unit 200 is made in the direction to optimize.

The control unit 600 also has versatility, and can be electrically connected to an additional device connected to the metal product heat treatment apparatus 1000 to perform integrated control.

According to an embodiment of the present invention, the discharge side cooling unit 500 for re-cooling the metal product after the heat treatment is completed is included on the discharge side of the metal product.

In this case, a process of manufacturing a finished product from heat treatment to cooling of the metal product may be performed according to a sequence of sequences in the metal product heat treatment apparatus 1000.

The above description of the present invention is for illustration only, and those skilled in the art to which the present invention pertains can understand that the present invention can be easily modified into other specific forms without changing the technical spirit or essential features of the present invention. will be. Therefore, it should be understood that the embodiments described above are illustrative in all respects and not restrictive. For example, each component described as a single type may be implemented in a distributed manner, and similarly, components described as distributed may be implemented in a combined form.

The scope of the present invention is indicated by the following claims, and all changes or modifications derived from the meaning and scope of the claims and their equivalent concepts should be interpreted to be included in the scope of the present invention.

100: lower housing
110: upper housing
120: opening and closing part
200: transfer unit
300: heat treatment part
310: first heating unit
320: first heat dissipation unit
330: 1st thermocouple
340: second heating unit
350: second heat dissipation unit
360: second thermocouple
400: heating chamber
500: discharge side cooling unit
600: control unit

Claims (11)

A metal product heat treatment apparatus for heat treatment of a metal product for a predetermined target temperature and a predetermined target time,
A lower housing having a rectangular interior space;
An upper housing located above the lower housing and having an internal space in communication with a portion of the lower housing;
A transfer part located in the inner space of the lower housing;
A heat treatment part located on an upper portion of the upper housing and applying heat to a metal product;
A heating chamber including a portion of the inner space of the lower housing and a portion of the inner space of the upper housing, wherein the metal product is heat-treated; And
And a control unit electrically connected to at least one of the transfer unit, the heat treatment unit, and the heating chamber to control operation,
The heat treatment unit,
A heating part partially extending inside the heating chamber to generate heat inside the heating chamber; And
And a heat dissipation part that performs a heat dissipation action between the inner upper surface of the heating chamber and the heat generation part. According to claim 1,
The transfer unit,
A supply-side roller that rotates at the supply side of the metal product;
A discharge-side roller that rotates on the discharge side of the metal product;
A belt member formed to surround the outer circumference of the supply-side roller and the discharge-side roller by forming a single closed curved surface; And
And an auxiliary roller positioned below the belt member to support the load of the belt member and to provide an auxiliary tension. delete According to claim 1,
The heat treatment unit,
And a thermocouple measuring the temperature in the heating chamber and converting it into an electrical signal and transmitting it to the control unit. According to claim 1,
The heat treatment unit,
Through the feedback control with the control unit, when the temperature in the heating chamber is lower than the target temperature, the metal product heat treatment apparatus characterized in that to increase the amount of heat. According to claim 1,
The heat treatment unit,
Through the feedback control with the control unit, when the temperature in the heating chamber is higher than the target temperature, a metal product heat treatment apparatus characterized in that to reduce the amount of heat. According to claim 1,
The heat treatment unit,
It includes a heat dissipation unit for dissipating heat in the heating chamber,
The heat dissipation unit includes a drive unit that is located above the upper housing to generate a driving force, a drive shaft extending from the drive unit into the heating chamber, and a heat dissipation fan connected to one end of the drive shaft to be rotationally driven. Metal product heat treatment device characterized by. The method of claim 4,
The thermocouple,
Metal heat treatment apparatus characterized in that it is located spaced a predetermined distance from the heat dissipation portion to the driving direction of the belt to measure the temperature in the heating chamber in real time. The method of claim 7,
The heat dissipation fan is a heat treatment device for a metal product, characterized in that located above the heat generating portion. According to claim 1,
The inner wall of the heating chamber is characterized in that it comprises a heat radiation layer for radiating heat into the heating chamber and a heat insulating layer for blocking heat transfer inside and outside the heating chamber. According to claim 1,
A metal product heat treatment apparatus comprising a discharge side cooling unit for re-cooling a metal product whose heat treatment is completed on the discharge side of the metal product.

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