KR100935112B1 - Rapid water cooling apparatus for heat treatment - Google Patents

Abstract

PURPOSE: A rapid water cooling apparatus for a heat treatment product formed like a hollow pipe is provided to minutely form crystal particle of a secondary tissue and to transforming ferrite and pearlite in the low temperature. CONSTITUTION: A rapid water cooling apparatus for a heat treatment product formed like a hollow pipe is composed of a coolant supply unit(10), a spray unit(20), a lifting unit(30), and a controller(40). The coolant supply unit supplies coolant. The spray unit surrounds the outside of the heat treatment object(w). The spray unit has an outer spray port(22) spraying the coolant supplied from the coolant supply unit to the outer surface of the heat treatment object. The spray unit has an inner spray port(24) spraying the coolant supplied from the coolant supply unit to the inner surface of the heat treatment object. The outer and inner spray ports are mutually connected to a connecting member(26). The lifting unit lifts the spray unit at the upside of the heat treatment object. The controller controls the spraying rate and time of the coolant sprayed from the spray unit.

Description

Rapid water cooling apparatus for heat treatment

The present invention relates to a hollow tube-shaped heat-treatment rapid water cooling device, and more particularly, to a hollow tube-shaped heat treatment product rapid water cooling to normalize by injecting a cooling water to the inner and outer circumferential surface of a large forged product of the hollow tube shape Relates to a device.

When the heat treatment method is largely divided, it is possible to remove the segregation and residual stress after casting or forging, and to homogenize or soften the annealing and crystal grains for the purpose of softening to improve mechanical properties and machinability. It can be divided into normalizing, quenching for hardening, and tempering for toughening.

Among these, normalizing is a heat treatment method that refines grains to increase strength, makes uniform austenite state when reheating for quenching or annealing, and removes segregation present in castings or forgings to make a uniform structure. It is usually heated in the austenite range (30 to 50 ° C above the A3 or Acm point) and gradually cooled in the air or by blowing air.

In particular, large ring products in the form of hollow tubes used as flanges for wind towers are produced by forging treatment. In general, slabs or ingots are cut and heated to the size of the product, and then pressed. The first forging is carried out to produce rough shaping. Next, the heat is re-heated to perform secondary forging to determine dimensions and shapes, and to perform heat treatment such as normalizing, quenching, and tempering to homogenize the structure and secure mechanical properties.

At this time, there are some problems because such a large ring forged product is usually air-cooled in air when heat-treated and cooled by normalizing.

1 is a continuous cooling transformation graph showing a cooling state in the conventional normalizing heat treatment.

As shown, since the temperature decreases slowly in proportion to time, the transformation from austenite to secondary tissues such as ferrite and pearlite occurs at very high temperatures (above 800 ° C). The grains in the tissue become large. As a result, mechanical properties such as tensile strength and low temperature impact characteristics of the finished product are slightly lowered.

In order to solve the above problems, it is possible to induce ferrite and pearlite transformation at a low temperature after rapid cooling to some extent by using a blower, but the above method is suitable for small forgings such as parts, steel sheets, tools, etc. Ring forgings are usually more than 5-6m in diameter and thick, so that the surface area per unit mass is relatively small compared to the plate, making it difficult to rapidly cool the blower. Because the surface is rapidly cooled, but the central part is slow cooled, it is difficult to cool the surface and the interior at the same time at low temperature so that transformation at low temperature occurs.

Because of this problem, there is a device that rapidly cools by spraying water on the surface of the conventional cooling device, but using such a device rather than quenching only the surface to produce martensite (martensite) structure on the surface it is likely to harm the desired mechanical properties It is difficult to control precise water injection amount, injection time and cooling rate.

In addition, in the case of the hollow tube-shaped products there is a disadvantage that the cooling efficiency is low because the water is not sprayed on the inner peripheral surface.

The present invention has been made to solve the above problems is an object of the present invention is rapid cooling by spraying water on the inner and outer circumferential surface of the large forging of the hollow tube shape and rapid cooling of the heat treatment material of the hollow tube shape with excellent cooling efficiency It is to provide a device.

Another purpose is to control the cooling water spraying amount and the spraying time according to the surface temperature of the normalizing heat treatment product, so that the transformation occurs into ferrite and pearlite at low temperature, so that the hollow tube-shaped heat treatment product rapid water can form fine crystal grains of the secondary structure. It is to provide a cooling device.

The present invention for achieving the above object is a cooling device for cooling the heat treatment of the heat-treated hollow tube shape, the cooling water supply unit for supplying the cooling water; The inner sprayer surrounding the outer side of the heat treated material and the coolant supplied from the coolant supply unit is an outer sprayer for spraying coolant to the outer circumferential surface of the heat treated material and an inner sprayer for spraying coolant to the inner circumferential surface of the heat treated material and the outer sprayer and the inner powder An injection unit comprising a connecting body connecting the dead bodies; Elevating means for elevating the sprayed portion from the upper side of the heat treated substance so that the heat treated substance is accommodated in the sprayed portion; And a control unit for controlling the injection amount and the injection time of the coolant sprayed from the injection unit.

Preferably, the spray unit includes an external spraying body for injecting cooling water to the outer circumferential surface of the heat treatment material and surrounding the outer surface of the heat treating material, an internal spraying body for spraying cooling water to the inner circumferential surface of the heat treating material, and the external spraying body and the inner Characterized in that it consists of a connecting body interconnecting the sub-corpse.

Preferably, the outer sprayer and the inner sprayer may include a horizontal spray pipe in which a plurality of annular tubes through which cooling water flows are arranged up and down, a plurality of vertical spray pipes vertically coupled to the horizontal spray pipe, and the horizontal It is characterized by consisting of a nozzle which is provided in the injection pipe and the vertical injection pipe for spraying cooling water.

Preferably, the internal spraying body is characterized in that the hollow tube-shaped central injection pipe disposed in the center of the heat treatment material, and the nozzle is provided on the outer peripheral surface of the central injection pipe to spray the coolant.

Preferably, the nozzle provided in the central injection pipe is detachably coupled, characterized in that the injection extension pipe is further coupled between the central injection pipe and the nozzle so as to extend the cooling water injection distance injected from the central injection pipe. It is done.

Preferably, the elevating means includes a guide installed upright on both sides of the injection unit, a lifting support inserted into the guide and coupled to the outside of the injection unit, a motor installed on the injection unit, and one side of the injection unit. It is coupled to the other side of the chain wound on the motor, and the weight balancing coupled to the chain end extending from the motor, characterized in that the injection unit is lifted by the driving of the motor.

Preferably, the motor is controlled to rotate forward or reverse by the control unit, characterized in that the injection unit can be oscillated along the guide (oscillation).

Preferably, the air blower is further provided on the outer side of the injection unit for injecting air to remove the coolant accumulated in the upper end surface of the heat treatment material.

Preferably, the control unit is composed of an optical temperature sensor for sensing the temperature of the surface of the heat treatment material, and a computer for controlling the injection unit by determining the programmed cooling water injection amount, injection time by receiving the measured value from the optical temperature sensor. It features.

Preferably, one side of the injection unit is provided with a centering means for adjusting the position of the heat treatment material so that the center of the heat treatment material and the center of the injection unit, the centering means is a 'v' shaped fixture that is in close contact with the side of the heat treatment material And a driving cylinder for advancing the fixture forward and backward.

The effect of the present invention by the above-described configuration is because the cooling water is evenly sprayed on the inner and outer peripheral surfaces of the large forging of the hollow tube shape, it is possible to rapidly cool the entire uniform, so the cooling efficiency is very excellent.

In addition, since the cooling rate can be controlled according to the surface temperature of the heat-treated material, the crystal grains are finely formed since the transformation to ferrite and pearlite at low temperature can improve mechanical properties such as tensile strength and low temperature impact characteristics.

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

Figure 2 is a front view showing a rapid heat treatment of the heat treatment material of the hollow tube shape according to an embodiment of the present invention.

As shown in the present invention, the cooling water supply unit 10, the injection unit 20, the lifting unit 30, and the control unit 40 are largely shown.

As shown, the cooling water supply unit 10 includes a cooling water tank 12 in which cooling water is stored, a hose 14 connecting the cooling water tank 12 and an injection unit 20 to be described later, and the cooling water tank 12. It may be composed of a pump (not shown) for pumping the cooling water from and a valve 16 for opening and closing the cooling water flowing through the hose 14 or to adjust the flow rate. That is, the coolant stored in the coolant tank 12 is supplied to the injection unit 20 to be described later through the hose 14 by the pump, and the opening and closing and supply amount adjustment are performed by the valve 16.

Next, the injection unit 20 will be described with reference to FIGS. 2 and 3.

3 is a perspective view illustrating the spray unit illustrated in FIG. 2.

The injection unit 20 is to cool the water by spraying a large heat forged product (hereinafter referred to as 'heat treatment') of the hollow tube heat-treated heat-treated to the outer peripheral surface 22 and the inner peripheral surface It is made of an inner injection body 24 for injection, the outer injection body 22 and the inner injection body 24 is connected to the connecting body 26 to communicate with each other.

As shown in FIG. 3, the outer sprayer 22 and the inner sprayer 24 have the same shape, but the outer sprayer 22 is configured to surround the outer circumferential surface of the heat treatment material w. The partial carcass 24 is disposed in the inner space of the heat treatment material w.

In more detail, the structure of the external injector 22 has a horizontal injector pipe 22a in which a plurality of layers are stacked at regular intervals while having a pipe-shaped annular shape so as to surround the outer circumferential surface of the heat treatment material w; A vertical injection pipe 22b having a straight pipe shape that is vertically coupled to the horizontal injection pipe 22a so that the horizontal injection pipes 22a are fixed at a predetermined interval up and down and communicate with each other, and the vertical injection pipe 22a is perpendicular to the horizontal injection pipe 22a. It consists of the several nozzle 22c formed at equal intervals on the yarn pipe 22b.

 This shape is to obtain a uniform cooling rate by spraying the cooling water evenly on the surface of the heat treatment material (w) of the hollow tube shape, the nozzle 22c is directed toward the outer peripheral surface of the heat treatment material (w), respectively, the horizontal injection pipe (22a) ) And the vertical injection pipe 22b.

Preferably, the nozzle 22c may be combined in various kinds, and it is preferable to have a replaceable structure to change the injection method. This is because precise cooling rate control requires a nozzle that sprays water as fog.

Therefore, in the case of general cooling, it is effective to install a nozzle for injecting water like a spray, but when precise cooling is required, the nozzle is cooled and replaced with a nozzle capable of spraying.

In order to easily replace the nozzle 22c, holes are formed on the horizontal injection pipe 22a and the vertical injection pipe 22b, and the respective nozzles 22c are fixed to each hole by screwing. Will be common, but is not limited to such.

The structure of the internal spraying body 24 is also the same, but the diameter of the horizontal spray pipe 24a should be smaller than the inner diameter of the heat treating material w because it must be accommodated in the heat treatment material w.

At this time, the nozzle 24c formed on the inner spray body 24 is installed outside the horizontal spray pipe 24a and the vertical spray pipe 24b so as to face the inner circumferential surface of the heat treatment material w and is also replaced with another type. Possibly combined.

On the other hand, the outer sprayer 22 and the inner sprayer 24 are connected to each other by a connecting body 26, the connecting body 26 is preferably a pipe, as shown in the shape of the '∩' And the horizontal injection pipes 22a and 24a at the top. Of course, it is preferable that a plurality is arranged in a circle at regular intervals.

In addition, the upper side of any one of a plurality of the connecting body 26 is connected to the hose 14 is supplied with the cooling water from the cooling water supply unit (10).

As described above, since the outer sprayer 22, the inner sprayer 24, and the connecting body 26 have the above-described structure, the heat-treated material w of the hollow tube shape is introduced into the spray unit 20. While being accommodated, it is positioned between the outer sprayer 22 and the inner sprayer 24, so that cooling water is sprayed and uniform cooling can be performed.

Another embodiment of the injection unit will be described with reference to FIG. 4. 4 is a perspective view showing another embodiment of the injection unit of the present invention.

The internal spraying body 24 may be implemented in other forms. As shown in the drawing, a plurality of nozzles 24c are coupled to the outer surface of the central injection pipe 24d having a sealed pipe shape on both sides thereof.

The central injection pipe 24d and the horizontal injection pipe 22a of the external injection body 22 are connected to the connection body 26 and may have a straight pipe shape.

In addition, the hose 14 is connected to the upper side of the center injection pipe 24d to allow water to be supplied to the center injection pipe 24d.

Here, when the inner diameter of the heat treatment material w is large, the distance between the center injection pipe 24d and the inner circumferential surface of the heat treatment material w is large, so that the coolant sprayed from the nozzle 24c of the center injection pipe 24d. Is hardly transferred to the inner circumferential surface of the heat treatment product (w). Therefore, as shown in the enlarged view of FIG. 4, the nozzle 24c of the central injection pipe 24d can be separated and a pipe-shaped injection extension tube 28 can be mounted, which is separated at the end of the injection extension tube 28. One nozzle 24c may be combined to extend the cooling water injection distance. By doing so, the cooling water may be injected close to the inner circumferential surface of the heat treatment product (w), thereby further increasing the cooling efficiency.

On the other hand, in the present invention, the air blower 50 may be further provided on the outside of the injection unit 20 as shown in FIG. The air blower 50 blows compressed air to the outer circumferential surface of the heat treated material w, in particular, the upper end of the heat treated material w to blow out the remaining cooling water.

When the thickness of the hollow tube-shaped heat-treated material w is large (about 50 mm), water remains at the upper end when cooling by spraying the cooling water, which may interfere with uniform cooling. Therefore, the air blower 50 removes moisture.

The air blower 50 may have various shapes. Preferably, the air blower 50 may have a shape similar to that of the external spraying body 22, and may be configured to allow compressed air to be injected. It may be good to have a plurality of air nozzles formed up and down to correspond to the height of w).

Next, the lifting means 30 will be described with reference to FIG. 2. As shown in FIG. 2, the lifting means 30 moves the spraying part 20 above the heat treatment material w and moves up and down. As described above, the guide 32 installed upright on both sides of the injection part 20, and the lifting support 34 which is fixed to one side of the injection part 20 and can be moved up and down in the state inserted into the guide 32, the minute It may be composed of a motor 36 installed on the upper part of the sand 20, the chain 38 and the weight balancing 39 coupled to the upper portion of the injection unit 20.

The lifting and lowering of the injection unit 20 is made along the guide 32. The guide 32 induces the lifting by the rail method, and uses the motor 36 for the lifting. The motor 36 Is a state in which forward and reverse rotation are possible by the control unit 40 to be described later, and the chain 38 is wound. One end of the chain 38 is coupled to and fixed to an upper portion of the connection body 26 of the injection part 20, and the other end is coupled to the weight balancing 39 corresponding to the weight via the motor 36. do.

Accordingly, the entire spraying unit 20 is movable up and down by the driving of the motor 36. At this time, when the weight balancing 39 acts as a weight, the spraying unit 20 is raised. If you go up, the injection unit 20 will be lowered.

On the other hand, the motor 36 may be controlled by the control unit 40 to oscillate the injection unit 20. In other words, the injection unit 20 can be repeatedly reciprocated up and down with a predetermined interval. This is because the cooling water sprayed from the nozzle is radially spread, and the amount sprayed on the surface of the heat treatment material (w) is different at each point. Therefore, when the oscillation is performed as described above, the cooling water may be evenly sprayed on the surface of the heat treatment material w.

Next, the control part 40 is demonstrated.

The control unit 40 controls the amount of the water supplied through the nozzles 22c and 24c by controlling the amount of water supplied through the hose 14 from the coolant supply unit 10 to control the amount of injection and the injection time of the optical temperature sensor ( 42) and the computer 44 in which the program is embedded.

The optical temperature sensor 42 is a sensor for measuring the temperature of the surface of the object, the sensor is installed and measured without contacting the object and is a known configuration. As shown in the heat treatment (w) is installed at a predetermined distance spaced apart to measure the temperature.

The computer 44 is programmed therein to control the injection amount and the injection time of the coolant according to the temperature measurement value of the heat treatment product w measured by the optical temperature sensor 42.

Supplementally, when rapid cooling is required to control the cooling rate according to the time, control is performed to increase the cooling water injection amount and the injection time and to appropriately reduce the injection amount and the injection time when slow cooling is required. It is also programmed to determine the injection amount and the injection time according to the shape, size and type of the heat treatment product w.

Such control is possible by opening or closing the valve 16 of the cooling water supply unit 10 or adjusting the supply amount, and thus a detailed description thereof will be omitted.

5 is a plan view showing a centering means of the present invention.

In the present invention, one side of the injection unit 20 may be further provided with a centering means 60 that can adjust the position of the heat treatment (w) so that the center of the heat treatment (w) and the center of the injection unit 20 to match. have.

It is very difficult to match the center of the heat treatment material (w) and the center of the injection unit 20 when the large heat treatment material (w) in the field is transferred to the equipment such as a forklift and positioned below the injection unit (20). If the centers do not coincide with each other, uniform cooling is difficult because a difference occurs in the amount or intensity of the cooling water sprayed on the surface of the heat treatment material (w) during the cooling operation.

Thus, as shown in the centering means which may be composed of a 'V' shaped fixture 62 and a drive cylinder 64 for driving the fixture 62 back and forth on one side where the heat treatment material (w) is located ( 60).

That is, the position of the fixture 62 is determined by the outer diameter of the heat treatment material w, and then the drive cylinder 64 is driven back and forth to stop the fixture 62 at a desired position. When the outer circumferential surface of the heat treatment material (w) is positioned to be in close contact with the fixture 62, the center can be accurately aligned.

For reference, a large amount of water vapor is generated when the cooling water is injected into the heat treatment material (w) in the injection part 20 above the injection part 20, so that the water vapor can be sucked out and discharged or recycled to another heat exchanger. It is preferable that the steam outlet 70 is further provided.

Hereinafter, referring to FIG. 5, the method of cooling the heat treated material and the mechanical property test result of the heat treated product will be mentioned.

6 is a continuous cooling transformation graph showing a cooling state during the heat treatment according to the present invention. Here, the continuous cooling transformation diagram is a graph showing the cooling state of the heat treated material with temperature as a time graph showing the time of transformation according to the cooling path.

First, the heat treatment material (w) is heated to 900 ° C or more to austenite, and then installed below the injection unit (20). At this time, the position of the fixture 62 is determined and fixed by the outer diameter of the heat treated material w, and then the heat treated material w is brought into close contact with the fixture 62 so that the center of the heat treated material w and the injection unit ( 20) coincide with the center. Then, the lifting means 30 is operated so that the spraying part 20 is lowered so that the heat treatment material w is accommodated in the spraying part 20.

At this time, the optical temperature sensor 42 detects the temperature of the heat treatment material (w), and determines the amount of cooling water injection and the injection time as programmed in the computer 44 and outputs the electrical signal to the operation of the valve 16 Cooling water is thereby supplied to the connecting body 26 of the spraying unit 20 at high pressure through the hose 14.

Cooling water introduced into the connecting body 26 is supplied to the outer sprayer 22 and the inner sprayer 24, respectively, and sprayed toward the heat-treated material w through the nozzles 22c and 24c.

As shown in FIG. 6, during the initial time (about 10 s), the heat-treated material w should be sprayed weakly so that the cooling solution is slow cooled. If a large amount of coolant is sprayed and quenched, the transformation occurs to the martensite structure. Should be.

Then, about 10 s, a large amount of cooling water is strongly sprayed and quenched until the temperature of the heat treatment product w reaches 550 ° C to 600 ° C. Due to this rapid cooling, the cooling curve is transformed into ferrite (723 ° C. and below) and pearlite (600 ° C. and below) at low temperatures. By causing transformation at low temperature, the growth of crystal grains in secondary tissues is delayed and the transformation nucleation site is increased to form fine grains. Therefore, the microstructure increases the mechanical strength and toughness significantly.

After rapid cooling in a short time, the cooling water is continuously sprayed lightly to about 1000 s to maintain a constant temperature. Because large forgings have a thick thickness, unlike the surface, the inside is not cooled quickly, so it is warmer than the surface. Therefore, if the coolant is not injected, the temperature of the surface may rise again. Spray coolant as appropriate in 44). As a result, transformation occurs not only on the surface but also inside.

After the constant temperature section as described above, the cooling water is sprayed again to finish cooling.

Through the cooling path, transformation occurs at low temperature to obtain fine grain of steel, which is superior in tensile strength or toughness than steel obtained by transformation at high temperature while being slowly cooled in the air.

These results can be compared through tensile strength test and low temperature impact test. The results are as follows.

 Conventional cooling method  Cooling method according to the present invention  Seal characteristics  Yield strength  295-325 MPa  299 to 374 MPa  Ultimate strength  450 to 515 MPa  485 to 549 MPa  Low temperature shock  Average  41.8 J  116.6 J  range  25 to 135 J  34.7-181.7 J

Here, the low temperature impact test represents a test in which the 'V' notched test piece is cooled to -50 ° C. and subjected to an impact, and it can be seen that the tensile properties are significantly increased compared with the conventional one.

In addition, Figure 7 is an enlarged photograph of the surface texture of the conventional heat treatment, Figure 8 is an enlarged photograph of the internal structure of the conventional heat treatment, Figure 9 is an enlarged photograph of the surface texture of the heat treatment according to the present invention, Figure 10 is the present invention This is an enlarged photo of the internal structure of the heat treatment material.

In the conventional case, as shown in FIGS. 7 and 8, the tissues are relatively coarse, and the size of the grains on the surface and the inside tissues can be seen to be significantly different. In other words, the inside is not rapidly cooled and the tissue is more coarse.

However, in the case of the present invention, as can be seen in Figures 9 and 10 it can be seen that the tissue is very fine compared to the prior art as well as the surface and internal tissue size is not significantly different. That is, it can be assumed that the surface and the inside are cooled uniformly, and thus the mechanical properties are greatly improved.

As described above, in the present invention, when heat treatment (normalizing) a large forging product having a hollow tube shape, a hollow tube-shaped heat treatment product which can improve mechanical properties by spraying cooling water on the inner and outer circumferential surfaces and controlling the cooling rate by a computer. It is to provide a rapid water cooling device and what is described with reference to the drawings is only one embodiment, the true technical protection scope of the present invention will be determined by the claims.

1 is a continuous cooling transformation graph showing a cooling state in the conventional normalizing heat treatment.

Figure 2 is a front view showing a rapid heat treatment of the heat treatment material of the hollow tube shape according to an embodiment of the present invention.

FIG. 3 is a perspective view of the spray unit illustrated in FIG. 2. FIG.

4 is a perspective view showing another embodiment of the injection unit of the present invention.

5 is a plan view showing a centering means of the present invention.

6 is a continuous cooling transformation graph showing a cooling state during the heat treatment according to the present invention.

Figure 7 is an enlarged photo of the surface texture of the conventional heat treatment.

Figure 8 is an enlarged photo of the internal structure of the conventional heat treatment.

9 is an enlarged photograph of the surface texture of the heat treatment product according to the present invention.

Figure 10 is an enlarged photograph of the internal structure of the heat treatment material according to the present invention.

<< Explanation of symbols for main part of drawing >>

10: cooling water supply unit 12: cooling water tank

14 hose 16 valve

20: injection part 22: external injection

22a: horizontal injector 22b: vertical injector

22c: nozzle 24: internal spray

24a: horizontal injector 24b: vertical injector

24c: nozzle 24d: central injection pipe

26: connecting body 28: injection extension pipe

30: lifting means 32: guide

34: lifting support 36: motor

38: chain 39: weight balancing

40: control unit 42: optical temperature sensor

44: computer

50: air blower

60: centering means 62: fixture

64: driving cylinder

70 steam outlet

w: heat treatment A: austenite

F: Ferrite P: Pearlite

M: Martensite Ms: Martensite start temperature

Claims (10)

delete In the cooling device for cooling the heat-treated material (w) of the heat-treated hollow tube shape, A cooling water supply unit 10 for supplying cooling water; Surrounding the outer side of the heat treatment (w) and the cooling water supplied from the cooling water supply unit 10 is located inside the external spray body 22 and the heat treatment (w) to spray the cooling water to the outer peripheral surface of the heat treatment (w) An injection unit 20 including an inner sprayer 24 for spraying cooling water on an inner circumferential surface of the heat treatment product w and a connecting body 26 for interconnecting the outer sprayer 22 and the inner sprayer 24; Elevating means (30) for elevating the injector (20) above the heat treatment material so that the heat treatment material (w) is accommodated in the spray unit (20); Heat treatment material rapid water cooling device of the hollow tube shape, characterized in that it comprises a; control unit 40 for controlling the injection amount, the injection time of the cooling water injected from the injection unit (20). The method of claim 2, The outer sprayer 22 and the inner sprayer 24 are vertical to the horizontal spray pipes 22a and 24a in which a plurality of annular tubes through which cooling water flows are arranged up and down, and perpendicular to the horizontal spray pipes 22a and 24a, respectively. And a plurality of vertical injection pipes 22b and 24b coupled to each other, and the nozzles 22c and 24c provided in the horizontal injection pipes 22a and 24a and the vertical injection pipes 22b and 24b to spray cooling water. Heat treatment material rapid water cooling device of hollow tube shape. The method of claim 2, The internal spraying body 24 is composed of a hollow tube-shaped central injection pipe 24d disposed at the center of the heat treatment material, and a nozzle 24c provided on an outer circumferential surface of the central injection pipe 24d to spray cooling water. Rapid water cooling device of the heat treatment material of the hollow tube shape. The method of claim 4, wherein The nozzle 24c provided in the center injection pipe 24d is It is detachably coupled, characterized in that the injection extension pipe 28 is further coupled between the central injection pipe 24d and the nozzle 24c to extend the cooling water injection distance injected from the central injection pipe (24d) Rapid water cooling device of the heat treatment material of the hollow tube shape. The method of claim 2, The lifting means 30, A guide 32 installed upright on both sides of the injection part 20, a lifting support 34 inserted into the guide 32 and coupled to the outside of the injection part 20, and above the injection part 20. The motor 36 is installed, one side is coupled to the upper portion of the injection portion 20, the other side is wound around the motor 36, the chain 38, the end of the chain 38 extending from the motor 36 Composed of weight balancing (39) coupled to, Heat treatment material rapid water cooling device of the hollow tube shape, characterized in that the injection unit 20 is elevated by the drive of the motor (36). The method of claim 6, The motor 36 is controlled to be rotated forward or reverse by the control unit 40, the hollow tube characterized in that the injection unit 20 can be oscillated along the guide 32 Rapid water cooling device for heat treatment of the shape. The method of claim 2, Outside the injection unit 20, Heat treatment material rapid water cooling device of the hollow tube shape, characterized in that the air blower (50) is further provided for injecting air to remove the cooling water accumulated on the top surface of the heat treatment (w). The method of claim 2, The control unit 40, An optical temperature sensor 42 for sensing the temperature of the surface of the heat treatment material (w) and the measured value is input from the optical temperature sensor 42 to determine the programmed coolant injection amount and the injection time to determine the injection unit 20. Hollow tube-shaped heat treatment product rapid water cooling device comprising a computer 44 for controlling. The method according to any one of claims 2 to 9, On one side of the injection unit 20, Centering means 60 for adjusting the position of the heat treatment material (w) so that the center of the heat treatment material (w) coincides with the center of the injection unit 20 is provided, The centering means 60 is a hollow tube comprising a 'v' shaped fixture 62 in close contact with the side of the heat treatment material (w), and a drive cylinder 64 for advancing the fixture 62 back and forth. Rapid water cooling device for heat treatment of the shape.

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