KR102349521B1 - Cooling device for preventing thermal deformation of steel sheet for plasma cutting of high manganese steel - Google Patents

Abstract

A cooling device for preventing thermal deformation of a steel sheet for plasma cutting of high manganese steel according to the present invention includes a water tank (200) for accommodating a coolant, a cooling jig (100) having a plurality of horizontal support diaphragms (104) for supporting a lower portion of a material to be cut, and a fixing device (500) for fixing a side surface of the material to be cut. The horizontal support diaphragm (104) of the cooling jig is generally formed in a rectangular plate shape, and an upper surface supporting the material to be cut is formed in a sawtooth shape. The water tank (200) includes a water level sensor which can be adjusted so that the height of the coolant accommodated therein is at 1/4 to 3/4 positions of the material to be cut. In order to further improve cooling performance, a water pipe (600) or a coolant injector (700) can be added. According to the present invention, the cooling performance of the material to be cut is excellent, such that quality can be improved by preventing the cut material from being twisted due to heat generated during plasma cutting.

Description

Cooling device for preventing thermal deformation of steel sheet for plasma cutting of high manganese steel

The present invention relates to a cooling device for preventing thermal deformation of a steel plate for plasma cutting of high manganese steel, and more particularly, by installing a cooling jig having a plate-shaped transverse diaphragm having a sawtooth shape in a water tank containing cooling water, on the cooling jig It relates to a device capable of plasma processing after fixing the material to be cut, thereby preventing the cut material from being twisted due to heat generated during plasma cutting.

A plasma cutter is a device that generates ultra-high-temperature plasma using electric power and argon gas and continuously generates a jet stream from a nozzle to cut metal. A conventional plasma cutter places a non-consumable electrode in the center and surrounds it with a nozzle such as copper alloy, then generates an arc between the electrode and the nozzle and sends an appropriate gas to the middle, and the gas becomes high temperature and becomes a plasma state.

The plasma cutting machine has the advantage that the plasma jet ejected at high speed through the nozzle can cut the cutting object at high speed. On the other hand, there are problems such as poor verticality, generation of cutting slag, generation of harmful gas, and thermal deformation of the cutting material due to high temperature.

Registered Utility Model Publication No. 20-0276853 “Plasma underwater cutting device” (registered on May 17, 2002) is designed to prevent dust, UV rays, noise, and thermal deformation of the product when cutting ferrous and non-ferrous metals with NC plasma cutter. Disclosed is a plasma underwater cutting device. Plasma underwater cutting device is particularly effective in collecting and blocking dust, ultraviolet rays, noise, etc. by floating the water in the tank side to the upper part of the material of the workbench using compressed air and cutting it underwater. It contributes to quality improvement by preventing deformation.

In Registered Patent Publication No. 10-0627486 “Metal plate cutting device and method” (registered on Sep. 15, 2006), when a heavy metal plate is cut using an oxygen torch, the cutting theory generated from the molten steel flowing down from the cut surface of the metal plate is minimized. Disclosed is a metal plate cutting device that can do this. The cutting device cools and re-solidifies the area cut by the molten metal plate cutting nozzle and the cutting nozzle with water in order to minimize the flow of molten metal to form the cutting snow and to easily remove the unavoidably formed cutting snow. It consists of a water jet nozzle.

In Patent Publication No. 10-1845834 “Cutter with cooling function” (registered on March 30, 2018), it has a cooling function that minimizes deformation due to heat by cooling the cut part while cutting the workpiece with a cutting machine such as oxygen or laser. A cutter is disclosed. To this end, it includes a cooling means for cooling the cut portion of the workpiece cut by the torch. The cooling means includes a nozzle disposed at the rear of the torch for spraying mist-shaped coolant, a compressor for supplying air to the nozzle, and coolant supply means for supplying coolant to the nozzle, is sprayed to the cutting part of the workpiece in the form of mist.

Patent Publication No. 10-2195603 “Cutter with cooling device” (registration on December 21, 2020) discloses a cutting machine having a cooling device that minimizes deformation due to heat by cooling the cut cut part while cutting the workpiece with the cutter. . In order to provide a cutter with a cooling device that minimizes the strength and deformation of the cut part by spraying coolant to the cut part cut by the torch and cooling it quickly, it is disposed at the rear of the torch and supplies coolant to the nozzle and the nozzle that sprays coolant A cooling means made of a pump is provided, and when the torch is moved by the moving means, cooling water is sprayed to the cut part of the cut workpiece through the nozzle to cool the cut part.

Registered Utility Model Publication No. 20-0276853 “Plasma underwater cutting device” (Registered on May 17, 2002) Registered Patent Publication No. 10-0627486 “Metal plate cutting device and method” (Registered on September 15, 2006) Registered Patent Publication No. 10-1845834 “Cutter with cooling function” (Registered on March 30, 2018) Registered Patent Publication No. 10-2195603 “Cutter with cooling device” (Registered on December 21, 2020)

An object of the present invention is to provide a cooling device for preventing thermal deformation of a steel sheet for plasma cutting that does not cause torsion in the cut product due to heat during cutting.

Another object of the present invention is to improve the cooling performance of the material to be cut and to provide a cooling device for preventing thermal deformation of a steel sheet for plasma cutting that saves the amount of water used.

Another object of the present invention, cooling for preventing thermal deformation of steel sheet for plasma cutting to maintain uniform cooling of the cut product by allowing constant submersion to 1/4 to 3/4 of the thickness even for materials of different thicknesses to provide the device.

Objects of the present invention are not limited to the objects mentioned above, and other objects not mentioned will be clearly understood by those skilled in the art from the following description.

According to one aspect for achieving the above object, there is provided a cooling device for preventing thermal deformation of a steel sheet for plasma cutting of high manganese steel, comprising: a water tank accommodating cooling water; a cooling jig having a plurality of support diaphragms installed side by side in the vertical direction in the water tank, and a plurality of horizontal support diaphragms that are vertically coupled to the support diaphragm in the horizontal direction to support the lower portion of the material to be cut; and a fixing device for fixing the side of the material to be cut so that the material to be cut does not move on the cooling jig.

The horizontal support diaphragm of the cooling jig is generally formed in a rectangular plate shape, and the upper surface supporting the material to be cut is formed in a sawtooth shape.

The water tank is provided with a water level sensor that can be adjusted so that the height of the coolant accommodated therein is at a position 1/4 to 3/4 of the material to be cut.

The cooling device for preventing thermal deformation of the steel sheet for plasma cutting includes a plurality of cooling water outlets formed at uniform intervals for discharging cooling water on the upper part of the material to be cut, and a water pipe installed in parallel with the plasma cutting direction; may include more.

The cooling device for preventing thermal deformation of the steel sheet for plasma cutting includes a first cooling nozzle and a second cooling nozzle positioned at the same distance from the cooling water supply pipe, and the first cooling nozzle and the first cooling nozzle before and after the moving direction of the plasma cutting torch It may further include a cooling water injection device for disposing each of the second cooling nozzles.

The cooling device for preventing thermal deformation of a steel sheet for plasma cutting according to the present invention can prevent distortion due to heat in the cut product by submerging a part of the material to be cut in cooling water using a sawtooth cooling jig. have.

The cooling apparatus for preventing thermal deformation of a steel sheet for plasma cutting according to the present invention, by circulating the cooling water in the water tank by the cooling water circulation pump, improves the cooling performance of the material to be cut and can save the amount of water used.

The cooling device for preventing thermal deformation of a steel sheet for plasma cutting according to the present invention uses a water level sensor to constantly flood materials with different thicknesses at a water level of 1/4 to 3/4 of the thickness, Cooling can be made uniform.

1 is a front view illustrating a state in which a cooling jig is disposed in a water tank of a cooling device for preventing thermal deformation of a steel sheet for plasma cutting according to an embodiment of the present invention.
2 is a perspective view illustrating a cooling jig having a sawtooth shape on an upper surface of a cooling device for preventing thermal deformation of a steel sheet for plasma cutting according to an embodiment of the present invention.
3 is a perspective view illustrating an arrangement state of a cooling jig, a fixing device, and a water pipe in a cooling device for preventing thermal deformation of a steel sheet for plasma cutting according to an embodiment of the present invention.
4 is a perspective view illustrating a material cutting state and a role of a fixing device in a cooling device for preventing thermal deformation of a steel sheet for plasma cutting according to an embodiment of the present invention.
5 is a perspective view illustrating the role of a water pipe in a cooling device for preventing thermal deformation of a steel sheet for plasma cutting according to an embodiment of the present invention.
6 is a perspective view illustrating a configuration of a coolant spraying device among cooling devices for preventing thermal deformation of a steel sheet for plasma cutting according to an embodiment of the present invention.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings and the content to be described later. However, the present invention is not limited to the embodiments described herein and may be embodied in other forms. Rather, the embodiments introduced herein are provided so that the disclosed subject matter may be thorough and complete, and that the spirit of the present invention may be sufficiently conveyed to those skilled in the art. Like reference numerals refer to like elements throughout. On the other hand, the terms used herein are for the purpose of describing the embodiments and are not intended to limit the present invention. In this specification, the singular form also includes the plural form unless otherwise specified in the phrase. As used herein, “comprises” and/or “comprising” means that the stated component, step, operation and/or element is the presence of one or more other components, steps, operations and/or elements. or addition is not excluded.

Hereinafter, a cooling device for preventing thermal deformation of a steel sheet for plasma cutting of high manganese steel according to an embodiment of the present invention will be described in detail with reference to the drawings. The cooling device according to an embodiment of the present invention can prevent thermal deformation of the steel sheet during plasma cutting of high manganese steel.

1 is a front view illustrating a state in which a cooling jig is disposed in a water tank of a cooling device for preventing thermal deformation of a steel sheet for plasma cutting according to an embodiment of the present invention.

A cooling device for preventing thermal deformation of a steel sheet for plasma cutting according to an embodiment of the present invention includes a water tank 200 , a water level sensor 300 , a cooling jig 100 , and a fixing device 500 .

The water tank 200 accommodates cooling water that prevents thermal deformation of the steel sheet during plasma cutting. The water tank may include a water level sensor 300 for checking the height of the cooling water accommodated therein.

The cooling jig 100 is located in the water tank, and includes a plurality of support diaphragms and a plurality of horizontal support diaphragms 104 to support the lower portion of the material to be cut.

As the support diaphragm of the cooling jig, the left support diaphragm 101, the right support diaphragm 102, the middle support diaphragm 103 and the like can be disposed at appropriate positions. The support diaphragms may be installed side by side to combine with the horizontal support diaphragm 104 . A plurality of support diaphragms are installed side by side in the vertical direction, it is preferable to install so as to be vertically coupled to the plurality of horizontal support diaphragms (104).

The plurality of horizontal support diaphragms 104 have a rectangular shape as a whole, are formed in a plate shape, and may have a groove at the lower portion that can be combined with the vertical support diaphragms. The upper part is formed in a sawtooth shape, and the material 400 to be cut is placed on the sawtooth shape. Since it is supported by a sawtooth-shaped diaphragm, it is advantageous for slug removal during plasma cutting, and heat deformation can also be prevented through uniform heat transfer.

The fixing device 500 fixes the side of the material to be cut so that the material to be cut 400 does not move on the cooling jig. The fixing device 500 may be fixed to the water tank or fixed to the cooling jig. It is preferable to install a plurality of fixing devices 500 according to the left and right sides of the material to be cut. The fixing device may be in the form of a block fixed to a water tank or a cooling jig, or in the form of a pressurizing device 550 using bolts or the like.

The water level sensor 300 may check the height of the cooling water accommodated in the water tank. The cooling water surface 350 is preferably located at 1/4 to 3/4 positions of the material 400 to be cut. If the cooling water level is too high, it interferes with the plasma cutting, and if it is too low, the cooling performance is lowered, which may cause thermal deformation, and the slug removal performance is deteriorated.

Using the water level sensor 300 and the control unit (not shown), the height of the coolant accommodated in the water tank 200 can be adjusted to be at a position of 1/4 to 3/4 of the material to be cut.

Plasma cutting may be performed while moving the nozzle of the torch 900 on the upper part of the material 400 to be cut in the X-axis and Y-axis directions. As the cutting material 400 , a steel plate using high manganese steel may be used.

A cooling water circulation pipe (not shown) may be formed in the water tank 200 , and the cooling water circulation pipe may be configured to be connected to a cooling water tank (not shown) and a cooling water circulation pump (not shown). Preferably, a control unit (not shown) for controlling the cooling water circulation pump to maintain a constant cooling water temperature is included. By circulating the cooling water in the water tank by the cooling water circulation pump, the cooling efficiency of the high manganese steel to be cut can be increased, and the amount of water used as the cooling water can be saved.

By adding a cooling water opening/closing valve (not shown) to the water tank, the control unit (not shown) can control only 1/4 to 3/4 of the thickness of the steel sheet to be submerged even for high manganese steel sheets having different thicknesses. In this case, the cooling efficiency of the cut steel sheet is kept constant, so that bending of the cut high manganese steel can be prevented.

2 is a perspective view illustrating a cooling jig having a sawtooth shape on an upper surface of a cooling device for preventing thermal deformation of a steel sheet for plasma cutting according to an embodiment of the present invention.

In order to install the cooling jig 100 in the water tank, a plurality of support diaphragms are used. In FIG. 2 , three support diaphragms of the left support diaphragm 101 , the right support diaphragm 102 , and the middle support diaphragm 103 were installed side by side in the longitudinal direction. The shape and number of support diaphragms can be appropriately selected in consideration of the size of the cooling jig.

A plurality of horizontal support diaphragms 104 are vertically coupled to the support diaphragm in the vertical direction. The plurality of horizontal support diaphragms 104 have a rectangular shape as a whole, are formed in a plate shape, and may have a groove at the lower portion that can be combined with the vertical support diaphragms. In Fig. 2, it is fixed to the left and right support diaphragms, and is fitted with an intermediate support diaphragm. The horizontal support diaphragm 104 and the plurality of support diaphragms may be coupled to each other by welding or the like.

3 is a perspective view illustrating an arrangement state of a cooling jig, a fixing device, and a water pipe in a cooling device for preventing thermal deformation of a steel sheet for plasma cutting according to an embodiment of the present invention.

The material 400 to be cut is positioned above the cooling jig 100 . A pressing device 550 is positioned on the side of the material 400 to be cut, and a water pipe 600 is positioned on the upper part.

A plurality of fixing devices 500 may be used to fix the material 400 to be cut. In FIG. 3 , a plurality of bolt-type pressing devices 550 are used on one side of the material 400 to be cut.

As the fixing device 500, a block-type fixing device can be used on both sides of the material 400, and the block type is used only on one side and a bolt-type pressing device 550 is used on the other side, or both of the fixing devices are of a bolt type. A pressurizing device 550 may be used.

4 is a perspective view illustrating a material cutting state and a role of a fixing device in a cooling device for preventing thermal deformation of a steel sheet for plasma cutting according to an embodiment of the present invention.

When the material to be cut 400 is cut using the plasma torch 900 , a cut product 450 can be obtained. However, when the cut product has an elongated shape, if it is not fixed, an error may occur due to flow, and the possibility of deformation due to heat increases. Therefore, in order to prevent this, it is preferable to use the pressing device 550 in the form of a bolt on at least one side of the material 400 to be cut.

In order to improve the performance of the pressing device 550, an elastic means such as a spring may be combined and used. In this case, the clearance due to cutting is adjusted so that it can be fixed more stably.

5 is a perspective view illustrating the role of a water pipe in a cooling device for preventing thermal deformation of a steel sheet for plasma cutting according to an embodiment of the present invention.

The water pipe 600 may discharge cooling water on the upper part of the material to be cut. The water pipe has a plurality of coolant outlets 650 formed at uniform intervals. Since the cooling water is discharged at uniform intervals, the water pipe can form a uniform cooling water film on the top of the material to be cut, thereby preventing thermal deformation of the cut material.

The water pipe 600 is preferably installed in a direction parallel to the plasma cutting direction in order to be less affected by the position where the plasma cutting is performed. The water pipe can be moved according to the distance from the torch as the plasma cutting progresses.

6 is a perspective view illustrating a configuration of a cooling water spraying device among cooling devices for preventing thermal deformation of a steel sheet for plasma cutting according to an embodiment of the present invention.

A coolant spraying device 700 for spraying coolant before and after the moving direction of the plasma torch 900 may be provided. The cooling water injection device 700 includes a first cooling nozzle 710 and a second cooling nozzle 720 . The second cooling nozzle and the second cooling nozzle are connected to the first cooling pipe 715 and the second cooling pipe 725, respectively, and the first cooling pipe and the second cooling pipe are connected to the cooling water supply pipe 730 and the cooling water are supplied with

The first cooling nozzle 710 and the second cooling nozzle 720 are positioned before and after the moving direction of the plasma cutting torch 900 . Since the first cooling pipe and the second cooling pipe have the same length, the first cooling nozzle and the second cooling nozzle are located at the same distance from the cooling water supply pipe 730 . Since cooling water is supplied before and after the moving direction of the plasma cutting torch, cooling is possible without wasting cooling water, and it is possible to uniformly cut by supplying cooling water at the same pressure before and after.

The cooling water supply pipe may include a valve (not shown) for controlling the cooling water pressure. The water pipe 600 and the cooling water supply pipe 730 may be circulated using a cooling water pump (not shown) connected to the cooling water of the water tank to save water and energy.

100: cooling jig (100) 101: left support diaphragm (101)
102: right support diaphragm (102) 103: middle support diaphragm (103)
104: horizontal spacer diaphragm (104) 105: sawtooth shape (105)
200: water tank (200)
300: water level sensor (300) 350: cooling water level (350)
400: material (400) 450: cut product (450)
500: fixing device (500) 550: pressurizing device (550)
600: water pipe (600) 650: cooling water outlet (650)
700: coolant injection device (700)
710: first cooling nozzle (710) 715: first cooling pipe (715)
720: second cooling nozzle (720) 725: second cooling pipe (725)
730: cooling water supply pipe (730)
900: torch (900)

Claims (3)

In the cooling device for preventing thermal deformation of steel sheet for plasma cutting of high manganese steel,
a water tank containing coolant; a cooling jig having a plurality of support diaphragms installed side by side in the vertical direction in the water tank, and a plurality of horizontal support diaphragms that are vertically coupled to the support diaphragm in a horizontal direction to support a lower portion of a material to be cut; and a fixing device for fixing the side of the material to be cut so that the material to be cut does not move on the cooling jig.
The horizontal support diaphragm of the cooling jig is generally formed in a rectangular plate shape, and the upper surface supporting the material to be cut is formed in a sawtooth shape,
The water tank is provided with a water level sensor that can be adjusted so that the height of the cooling water accommodated therein is at a position of 1/4 to 3/4 of the material to be cut,
Heat of a steel plate for plasma cutting, characterized in that it further comprises a water pipe having a plurality of cooling water outlets formed at uniform intervals for discharging cooling water on the upper part of the material to be cut, and installed in a direction parallel to the plasma cutting direction. Cooling device for strain relief. delete The method of claim 1,
A cooling water injection device having a first cooling nozzle and a second cooling nozzle positioned at the same distance from the cooling water supply pipe, and respectively disposing the first cooling nozzle and the second cooling nozzle before and after the moving direction of the plasma cutting torch; A cooling device for preventing thermal deformation of a steel sheet for plasma cutting, comprising:

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