KR100721434B1 - Thermostat for heat treatment process - Google Patents

Abstract

The present invention provides a thermostat for a heat treatment process to be supplied to the secondary process by controlling the temperature of the metal material heated in the primary process. The thermostat for such a heat treatment process comprises a conveyor belt, a first chamber and a second chamber. Conveyor belts are formed in the upper and lower perforations of a predetermined size so that the heated metal material is placed and transported. The first chamber is formed on the conveying path of the conveyor belt and has a side wall on which an outlet through which the conveyor belt passes is formed, has an upper wall above the conveyor belt, and a lower wall below the conveyor belt. Such a first chamber allows a first cavity to be formed above the conveyor belt and a second cavity to be formed below the conveyor belt. By such a configuration, the first chamber allows the outside air to flow through the lower wall, and then sequentially passes through the second cavity, the conveyor belt, and the first cavity, and then is exhausted to the outside. The second chamber is formed so as to have an upper wall on the upper side of the conveyor belt, the side chamber is disposed in series with the first chamber to form an outlet through which the conveyor belt passes. Such a second chamber allows a third cavity to be formed above the conveyor belt, such that the air therein is stirred in the third cavity.

Description

Thermostat for heat treatment process {THERMOSTAT FOR HEAT TREATMENT PROCESS}

1 shows a simplified illustration of a conventional thermostat subject to the present invention;

2 is a view briefly showing the thermostat in the direction in which the metal material in Figure 1;

3 is a view for explaining a thermostat according to the spirit of the present invention;

4 to 7 are views for explaining a thermostat according to a preferred embodiment of the present invention;

8 is a view for explaining an example of a heat treatment system configured using a thermostat according to a preferred embodiment of the present invention.

Explanation of symbols on the main parts of the drawings

1, 1 ': metal material 10: thermostat

12, 12 ', 12 ": conveyor belt 20: first chamber

22: first cavity 24: second cavity

30: (first chamber) wall 32: (first chamber) upper wall

34: bottom wall 35: heating element

38: intermediate wall 40: exhaust unit

42: exhaust fan 44, 94: motor

46 exhaust pipe 50 air injection unit

52: nozzle 53: injection hole

60: door 70: second chamber

72: third cavity 80: (second chamber) wall

82: (second chamber) top wall 90: stirring unit

92: stirring pan 100: heating furnace

110: tempering furnace 112: (tempering furnace) frame

The present invention relates to a thermostatic bath for a heat treatment process, and more specifically, after heating a metal material such as a general steel in a heating furnace to maintain the temperature of the heated metal material suitable for the tempering process so that the metal material is supplied to the tempering tank It relates to a thermostat for a heat treatment process.

Various types of heat treatment methods are well known in order to improve the properties of metal materials, and heat treatment apparatuses have been proposed and applied to effectively proceed with each heat treatment method. For example, Republic of Korea Registered Utility Model Publication No. 20-0169552 "Box-type furnace for heat treatment" proposes a box-type furnace for heat treatment that has a structure that can extend in the longitudinal direction and can be adjusted in height, registration number No. 0248329 "cooling "Heat furnace for heat treatment with means" proposes a furnace in which the heating means and the cooling means are integrally formed.

Meanwhile, in order to heat-treat the metal material forged with a general steel such as SS41, as shown in FIG. 1, the heating furnace 510, the thermostat 520, and the tempering furnace 530 are continuously disposed, and from the heating furnace 510. A system 500 has been proposed for installing a conveyor 540 across the tempering furnace 530 to thermally transport the metal 1 continuously.

The heat treatment system 500 is quenched by heating the metal material 1 forged in the furnace 510 to about 900 ° C. to change the metallic property to an austenitic system to obtain a desired hardness. The thermostat 520 generates a standard structure (perlite, ferrite structure) in the temperature range of 800 ℃ to 550 ℃ according to the product type, and the temperature suitable for the tempering process before the metal material 1 is charged into the tempering furnace 530. Adjust to have And in the tempering furnace 530 to stabilize the tissue through a tempering process of about 40 minutes at a temperature of 700 ℃ to 650 ℃. After the heat treatment process, the forged metal material 1 is machined and finished by surface hardening through carburization or high frequency heat treatment.

At this time, in the conventional heat treatment system 500, the thermostat 520 simply blows air into the upper portion of the metal material 1 transferred to the conveyor 540 using the fan 522 installed on the upper portion of the conveyor 540. It is comprised so that the metal material 1 may be cooled. Therefore, the conventional thermostatic bath 520 cannot expect uniform cooling of the metal material 1, so that a hardening of the metal material 1 occurs, or a agglomeration structure is generated. There is a problem that deformation is caused. In particular, such a problem, as shown in Figure 2, when the metal material 1 is stacked on the conveyor 540, the metal material 1 located outside is quenched (tissue hardening), the metal material 1 'located inside is slow cooling This problem becomes even bigger if it is (agglomerated tissue).

Therefore, the present invention is proposed to solve the problems of the conventional heat treatment system, the first process is a heat treatment by heating the metal material to a higher temperature in the primary process and to a lower temperature than the primary process in the secondary process It is to provide a thermostat for a heat treatment process to ensure that the finished metal material has a suitable condition for the secondary process. In particular, an object of the present invention is to provide a new type of heat treatment process that can effectively cool down to a temperature for performing the tempering process while generating a standard structure by uniformly cooling the metal material charged into the tempering furnace after being heated in the furnace. To provide a thermostat.

According to a feature of the present invention for achieving the above object, the present invention in the thermostat for the heat treatment process to be supplied to the secondary process by adjusting the temperature of the heated metal material in the primary process, the perforations of the predetermined size in the upper and lower parts Conveyor belt is formed so that the heated metal material is placed and transported; Located on the conveying path of the conveyor belt and having a side wall on which an outlet through which the conveyor belt passes is formed and has an upper wall above the conveyor belt and a lower wall below the conveyor belt, The first cavity is formed, and the second cavity is formed at the lower side of the conveyor belt so that outside air flows through the lower wall, and subsequently passes through the second cavity, the conveyor belt, and the first cavity. A first chamber to be exhausted afterwards; It is arranged so as to have a side wall disposed in series with the first chamber and the outlet through which the conveyor belt passes, and having an upper wall on the upper side of the conveyor belt, so that a third cavity is formed on the upper side of the conveyor belt, so that the air inside And a second chamber to cause stirring in the third cavity.

In the thermostat for the heat treatment process according to the present invention, the first chamber is installed so as to be positioned on the lower portion of the conveyor belt on the second cavity, further comprising a nozzle in which the injection hole is formed in the conveyor belt direction, from the outside Air may be supplied through the nozzle to be injected into the lower portion of the conveyor belt.

In the thermostat for the heat treatment process according to the present invention, the side wall between the first chamber and the second chamber is composed of one intermediate wall, the intermediate wall of the first cavity and the second chamber of the first chamber. Perforations may be formed to allow the third cavity to communicate.

In the thermostat for the heat treatment process according to the present invention as described above, the first chamber may further include a door installed on the lower wall to adjust the amount of air introduced from the outside.

In the thermostat for the heat treatment process according to the present invention, the first chamber is installed in the center of the upper wall of the connecting tube communicating with the first cavity, the outside of the upper wall by the drive of the motor through the connecting tube And an exhaust fan that sucks air in the first cavity and discharges it to the exhaust pipe, wherein the second chamber is located above the center of the third cavity and is driven by a motor installed outside the upper wall of the second chamber. A stirring fan may be provided to allow the air in the third cavity to be stirred. In this case, each of the first chamber and the second chamber may further include a heating element installed around the first cavity and the third cavity to control the temperature of the air in the first cavity and the third cavity.

3 is a view for explaining a thermostat according to the technical spirit of the present invention.

3, the thermostat 10 for the heat treatment process according to the present invention includes a first chamber 20 designed to cool the metal material 1 conveyed by the conveyor belt 12 as uniformly as possible. The second chamber 70 is designed to generate a standard structure while controlling the metal material 1 ′ cooled to some extent through the first chamber 20 to a temperature for a tempering process in a uniform cooling atmosphere. According to the thermostat 10 of the present invention, the heat treatment failure of the metal materials 1 and 1 'due to rapid cooling or slow cooling that can be generated on the metal materials 1 and 1' transferred through the conveyor belt 12 effectively. You can prevent it.

Referring to FIG. 3 again, the thermostat 10 according to the present invention is disposed between the heating furnace 100 for the quenching process, which is the first process, and the tempering furnace 110, for the tempering process, which is the secondary process. . The thermostat 10 is a temperature and tissue suitable for the tempering process by cooling the metal material 1 stably before the quenching process is completed in the heating furnace 100 is charged into the tempering furnace 110 for the tempering process To have.

To this end, the thermostat 10 according to the present invention includes a conveyor belt 12, a first chamber 20, and a second chamber 70.

Conveyor belt 12 is formed in the upper and lower perforations of a predetermined size so that the heated metal material (1) transferred from the heating furnace 100 is placed and transported. Such a conveyor belt 12 usually uses a belt having a gap by forming perforations or continuously installing a plate so that air can pass in the up and down direction instead of the belt blocked up and down.

The first chamber 20 is installed on the conveyance path of the conveyor belt 12. The first chamber 20 has a wall 30 to allow the conveyor belt 12 to pass from one side to the other side and to form the first cavity 22 and the second cavity 24 therein. That is, the wall 30 of the first chamber 20 has a side wall through which an outlet through which the outlet 30 is formed, has an upper wall 32 above the conveyor belt 12, and a lower wall 34 below the conveyor belt 12. It is formed to have. By the wall 30, the first chamber 22 is formed on the upper side of the conveyor belt 12, and the second cavity 24 is formed on the lower side of the conveyor belt 12. . Here, the first cavity 22 and the second cavity 24 are spatial concepts set based on the conveyor belt 12. In addition, after the exhaust unit 40 having the exhaust fan 42 is installed in the first chamber 20 and the outside air flows through the lower wall 34, the second cavity 24, the conveyor belt 12, After going through the first cavity 22 sequentially, it is to be exhausted to the outside. In addition, as in the preferred embodiment of the present invention described below, the nozzle 52 of the air injection unit 50 is installed below the conveyor belt 12 so that the injection hole 53 is directed to the conveyor belt 12 so that the metal material 1 Even when the stack is stacked, the air effectively acts on the inner metal material 1.

The second chamber 70 is installed on the conveying path of the conveyor belt 12 in the same manner as the first chamber 20, and the second chamber 70 is secondarily cooled in the first chamber 20. It is arranged in series with the first chamber 20 for cooling. The second chamber 70 has a wall 80 to allow the conveyor belt 12 to pass from one side to the other side and to form a third cavity 72 therein. That is, the wall 80 of the second chamber 70 has a sidewall through which an outlet through which the outlet 80 is passed, is formed to have an upper wall 82 above the conveyor belt 12, and the first chamber 20 and the intermediate wall ( Divided by 38). The third cavity 72 is formed in the second chamber 70 above the conveyor belt 12 by the wall 80. In the second chamber 70, a stirring unit 90 having a stirring fan 92 is installed to circulate air in the third cavity 72.

At this time, the walls 30 and 80 of the first chamber 20 and the second chamber 70 are made of refractory materials such as refractory bricks, as in a typical furnace having a high temperature. And it has a structure that is sealed except the inlet and outlet of the conveyor belt (12).

According to the thermostat for the heat treatment process of the present invention as described above, the temperature control is carried out before the metal material heated in the heating furnace is charged into the tempering furnace to be effective and stable. That is, in the thermostat according to the present invention, the cooling air (normally applying air at room temperature) acts uniformly on the metal material transferred after being heated in the heating furnace, and is cooled in an air atmosphere having a second uniform temperature. By doing so, it is possible to effectively eliminate tissue instability due to cooling variation or speed difference.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to FIGS. 4 to 8, and like reference numerals denote like elements for performing the same functions in FIGS. 3 to 8. On the other hand, in the drawings and detailed description about the configuration and operation that can be easily understood by those skilled in the art in a general heat treatment system, illustration and reference are briefly or omitted. In particular, for the heating furnace and the tempering furnace which are not directly related to the technical features of the present invention in the heat treatment system, detailed descriptions and illustrations of specific technical configurations and operations are omitted, and only the technical configurations related to the present invention are briefly shown. Or explained. However, such a heat treatment system will be easily accessible with reference to conventional heating and tempering furnaces. In addition, although the size ratio between the elements is somewhat different in the drawings of the drawings or the size between the parts that are combined with each other is expressed, the representation of such drawings can be easily understood by those skilled in the art. As they are parts, a separate description is omitted.

4 is a view showing the main configuration of the thermostat according to the preferred embodiment of the present invention in the conveying direction of the conveyor belt, Figure 5 is a view showing the main configuration of the thermostat shown in Figure 4 in a plan view, Figure 6 is in Figure 4 The main configuration of the first chamber is shown in a direction perpendicular to the conveying direction of the conveyor belt, Figure 7 is a view showing the main configuration of the second chamber in the direction perpendicular to the conveying direction of the conveyor belt in Figure 4, 8 is a view for explaining an example of a heat treatment system configured using a thermostat according to a preferred embodiment of the present invention.

4 to 8, the thermostat 10 according to a preferred embodiment of the present invention includes a conveyor belt 12, a first chamber 20, and a second chamber 70.

The conveyor belt 12 uses a mesh belt having holes of a certain size. As shown in FIG. 8, in the conveyor belt 12, the metal material 1 having completed the process in the heating furnace 100 has a tempering furnace 110 through the first chamber 20 and the second chamber 70. To be charged. At this time, the conveyor belt 12 of the thermostat 10 according to the present embodiment, as shown in Figure 8, applies a conveyor belt 12 "of the tempering furnace 110. Of course, such a configuration can be changed as necessary Although this may be possible, in the thermostat 10 according to the present embodiment, the first chamber 20 and the second chamber 70 have a frame of the tempering furnace 110 to simplify the installation thereof and reduce the installation area of the heat treatment system. And a metal material 1 conveyed from the conveyor belt 12 ′ of the heating furnace 100 and continuously on the conveyor belt 12 ″ to be transferred to the tempering furnace 110. To allow for constant temperature processing.

4 to 8, in the thermostat 10 according to the present embodiment, the first chamber 20 and the second chamber 70 are continuously installed on the conveyor belt 12. The first chamber 20 and the second chamber 70 are configured such that there is a difference in the operation thereof. That is, the first chamber 20 functions to uniformly cool the metal material 1 in which the process in the heating furnace 100 is completed, and the second chamber 70 is a metal material cooled to some extent in the first chamber 20. It acts to have a standard structure while having a temperature for the tempering process before charging (1 ') to the tempering furnace 110 in the atmosphere maintained at a constant temperature.

To this end, referring to FIGS. 4 to 6, the first chamber 20 constitutes an inner space by an upper wall 32 and a lower wall 34 and a wall 30 formed by sidewalls connecting the side walls. In the inner space constituted by the wall 30, there is a first cavity 22 formed on the upper portion of the conveyor belt 12 and a second cavity 24 formed on the lower portion of the conveyor belt 12. The heating element 35 is installed in the wall 30 constituting the first cavity 22 to prevent the outside of the metal material 1 from being overcooled. In addition, in the first chamber 20 of the present embodiment, the nozzle 52 is installed on the lower surface of the conveyor belt 12 to uniformly cool the cooling air to flow into the central portion of the metal 1 so that the outside of the metal 1 Have the same cooling conditions as Such a nozzle 52 is installed so that the injection hole 53 is directed toward the conveyor belt 12, as shown in FIG. 5, a plurality of nozzles 52 are connected to the branch pipe 54 for inducing the air of the blower 56. Is installed. In addition, in the first chamber 20 of the present embodiment, the door 60 is installed on the lower wall 34 to adjust the amount of air introduced from the outside.

As described above, the first chamber 20 according to the present exemplary embodiment has a circulation structure in which external air is introduced into and discharged to the outside in order to uniformly cool the metal material 1, and in and out of the metal material 1. In order to reduce the difference in cooling that may occur, as well as the heating element 35 is installed, a nozzle 52 for blowing cooling air into the central portion of the metal material 1 is installed, and the door 60 is installed on the lower wall 34. To control the amount of air flowing in. The flow of air in the first chamber 20 is effected by the exhaust unit 40. This exhaust unit 40 is provided on the upper wall 32. That is, the exhaust unit 40 has a connecting pipe 41 communicating with the first cavity 22 at the center of the upper wall 32, and is connected to the exhaust pipe 40 by driving the motor 44 from the outside of the upper wall 32. 41 is an exhaust fan 42 which sucks air in the first cavity 22 and discharges it to the exhaust pipe 46. The outside air introduced through the door 60 of the lower wall 34 by the exhaust unit 40 and the air injected through the nozzle 52 are formed in the second cavity 24, the conveyor belt 12, and the first air. By going through the first cavity 22 sequentially and exhausting to the outside, the cooling air acts uniformly to the inside and the outside of the metal material 1.

Referring again to FIGS. 4, 5 and 7, the second chamber 70 has a third cavity 72 formed on top of the conveyor belt 12 by a wall 80 having an upper wall 82. . The second chamber 70 does not have a separate internal space under the conveyor belt 12 like the first chamber 20 described above. Therefore, the lower wall of the wall 80 is configured to enable the conveyance of the conveyor belt 12, as shown in Figure 8 is configured by applying the frame 112 of the tempering furnace 110. The heating element 88 is installed in the wall 80 constituting the third cavity 72 so that the temperature in the third cavity 72 is maintained at a uniform temperature. The second chamber 70 is divided by the intermediate plate 38 having the perforations of the first cavity 22 and the third cavity 72 in order to have a somewhat continuous atmosphere with the first chamber 20. To ensure that

As described above, the second chamber 70 according to the present embodiment allows the metal material 1 ′ cooled to some extent through the first chamber 20 to be cooled in a uniform temperature atmosphere and to have a temperature for a tempering process. To this end, the second chamber 70 maintains a constant temperature in the third cavity 72 and allows internal air to be stirred and circulated in the third cavity 72 to form a uniform atmosphere. This air flow is made by the stirring unit 90. This stirring unit 90 is located above the center in the third cavity 72 and consists of a stirring fan 92 driven by a motor 94 installed outside the upper wall 82 of the second chamber 70. . By such a stirring unit 90, the air in the third cavity 72 is stirred in a vortex form so as to maintain a uniform cooling atmosphere as a whole.

As described above, the thermostat for the heat treatment process according to a preferred embodiment of the present invention is shown in accordance with the above description and drawings, but this is merely described for example and various changes within the scope without departing from the spirit of the invention And those skilled in the art will appreciate that changes are possible.

According to the thermostat for the heat treatment process according to the present invention, the temperature control to be carried out before the metal material heated in the heating furnace is charged into the tempering furnace to be effective and stable. In other words, the thermostat according to the present invention is to cause the cooling air to uniformly act primarily on the metal material transferred after being heated in the heating furnace, and to be cooled in the air atmosphere having the second uniform temperature, due to the cooling variation or the speed difference. It can effectively remove tissue instability.

Claims (6)

In the thermostat for the heat treatment process for controlling the temperature of the metal material heated in the primary process to be supplied to the secondary process, A conveyor belt having upper and lower perforations having a predetermined size and allowing the heated metal material to be placed and conveyed; Located on the conveying path of the conveyor belt and having a side wall on which an outlet through which the conveyor belt passes is formed and has an upper wall above the conveyor belt and a lower wall below the conveyor belt, The first cavity is formed, and the second cavity is formed at the lower side of the conveyor belt so that outside air flows through the lower wall, and subsequently passes through the second cavity, the conveyor belt, and the first cavity. A first chamber to be exhausted afterwards; It is arranged so as to have a side wall disposed in series with the first chamber and the outlet through which the conveyor belt passes, and having an upper wall on the upper side of the conveyor belt, so that a third cavity is formed on the upper side of the conveyor belt, so that the air inside A second chamber to cause stirring in the third cavity; The first chamber is provided to be positioned below the conveyor belt on the second cavity, and further includes a nozzle in which injection holes are formed in the direction of the conveyor belt, and supplies air from the outside through the nozzle to A thermostat for heat treatment process, characterized in that to be sprayed to the bottom. The method of claim 1, The side wall between the first chamber and the second chamber is composed of one intermediate wall, and the intermediate wall is formed with a perforation for communicating the first cavity of the first chamber and the third cavity of the second chamber. Thermostat for heat treatment process characterized in. The method of claim 1, The first chamber is a thermostat for heat treatment process characterized in that it further comprises a door installed on the lower wall to control the amount of air flowing from the outside. The method of claim 1, The first chamber is provided with a connecting tube communicating with the first cavity at the center of the upper wall, and sucks the air in the first cavity through the connecting tube by the driving of a motor from the outside of the upper wall to discharge to the exhaust pipe. With exhaust fan, The second chamber is positioned above the center of the third cavity, and is provided by a stirring fan driven by a motor installed outside the upper wall of the second chamber to stir the air in the third cavity. Thermostat for heat treatment process. The method of claim 4, wherein Each of the first chamber and the second chamber further includes a heating element installed around the first cavity and the third cavity to adjust the temperature of the air in the first cavity and the third cavity. Thermostat for process. delete

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