JP5268148B2 - Plasma cutting device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To cut an upper edge in a curved surface shape by discriminating a program corresponding to the vertical cutting in a process of cutting a workpiece to be cut by a plasma torch. <P>SOLUTION: A control device 21 of a plasma cutting apparatus A includes a cutting condition storage unit 21b, a shape information storage unit 21c, an input/output unit 21f for designating the angular range of a plasma torch for cutting a curved surface of an upper edge of a workpiece, a discrimination unit 21e for comparing the angle of a cut surface in a plan shape with the angular range of the plasma torch for R-cutting, and for executing the discrimination, and a control unit 21a which reads at least one condition out of the cutting conditions consisting of the cutting current and the cutting speed, the height of the plasma torch, the angle of the plasma torch and the flow rate of plasma gas stored in the cutting condition storage unit 21b corresponding to an area for R-cutting, and controlling the cutting current to be applied to an electrode of the plasma torch, the flow rate of plasma gas, the moving speed of the plasma torch, the height of the plasma torch from the workpiece, and the angle of inclination of the plasma torch to the workpiece. <P>COPYRIGHT: (C)2010,JPO&amp;INPIT

Description

  The present invention selects a cutting surface in a shape to be cut from a material to be cut represented by a steel plate, particularly when the surface is coated, and makes the upper edge curved. The present invention relates to a plasma cutting apparatus capable of cutting.

  When a material to be cut typified by a steel plate is cut, a plasma method using a plasma torch for injecting a plasma arc from a nozzle toward the material to be cut has been adopted. The plasma cutting method is advantageous because it can achieve a higher cutting speed than the gas cutting method.

  A plasma cutting apparatus that performs a plasma cutting method includes a carriage that runs along a rail, a transverse carriage that is mounted on the carriage and that traverses the rail, a plasma torch that is mounted on the transverse carriage, a carriage, a transverse carriage, And a control device that controls the operation of the plasma torch. Information on the shape to be cut from the material to be cut, information on the vertical cutting area in the shape to be cut, information on specifying the groove cutting area, information on the torch angle in each cutting area, etc. to the control device After the input, cutting is performed on the material to be cut.

  In addition, for example, most of the ballast tank portion of a ship in shipbuilding is exposed to seawater, so the surface is painted to prevent the occurrence of rust. In this case, the cut surface is also painted, but at the portion where the cut surface is cut substantially perpendicularly, the intersection (edge) of the cut surface and the surface of the steel sheet is substantially perpendicular, and this edge is used as the starting point. There arises a problem that the film is easily peeled off. For this reason, the edge of the cut surface and the surface is subjected to secondary processing with a sander or a chamfering machine to make it a dull angle, and then painted, which is an obstacle to shortening the construction period.

  In order to solve such a problem, the present applicant has developed a plasma cutting method and a plasma cutting apparatus for cutting the edge into a curved surface by changing the conditions for driving the plasma torch (Patent Literature). 1).

WO 2008/044756

  In the technique described in Patent Document 1 described above, the edge between the cut surface and the surface of the material to be cut can be cut into a curved surface (R-surface shape). However, it is necessary to specify the shape of the cutting surface (curved surface cutting, vertical cutting, groove cutting) for each region in the shape to be cut, and the work until the cutting work starts becomes complicated Has also occurred.

  An object of the present invention is to provide a plasma cutting apparatus capable of discriminating a program corresponding to vertical cutting and cutting an edge into a curved surface in a process of cutting a preset planar shape from a material to be cut by a plasma torch. Is to provide.

  In order to solve the above-described problems, a plasma cutting device according to the present invention supplies a plasma gas around an electrode and injects a plasma arc from a nozzle to cut a material to be cut. A moving device that moves according to a cutting path, a cutting current applied to an electrode of the plasma torch, a plasma gas flow rate, a moving speed of the plasma torch, a height of the plasma torch from the workpiece, and an inclination angle of the plasma torch with respect to the workpiece A plasma cutting device that vertically cuts the workpiece, or vertically and groove cuts the workpiece, or performs groove cutting. Cutting current, cutting speed, plasma torch height, plasma torch angle and plasma gas when cutting the upper edge of the tube into a curved surface A cutting condition storage unit that stores cutting conditions for curved surface cutting, and a shape information storage unit that stores shape information including the shape to be cut and the angle of the plasma torch in the cutting region in the shape, and curved surface cutting in advance The angle range of the plasma torch corresponding to the region to be stored is stored, and when the angle of the plasma torch in the cutting region in the shape stored in the shape information storage unit is within the angle range of the plasma torch, the upper edge is curved A discriminating unit that discriminates as a curved surface cutting region to be cut, and a cutting current and a cutting speed, a plasma torch height, and a plasma torch angle that are stored in the cutting condition storage unit corresponding to the curved surface cutting region discriminated by the discriminating unit; A cutting current and a plasma gas that are read out and applied to the electrode of the plasma torch by reading at least one of the cutting conditions consisting of the plasma gas flow rate. It is those composed has a control unit for controlling the angle of inclination with respect to the cutting object height and the plasma torch from the cutting object moving speed and the plasma torch of the flow rate and the plasma torch, the.

  In the above plasma cutting apparatus, the control device is configured such that the angle of the plasma torch in the cutting area in the shape to be cut from the material to be cut corresponds to the area to be cut in the curved surface stored in the determination unit in advance. When there is information in the range and the cutting region is a region that does not cut a curved surface, the region is cut with a cutting condition suitable for normal vertical cutting without changing to a condition corresponding to curved surface cutting. It is preferable to have a discrimination unit for discrimination.

  In the plasma cutting apparatus according to the present invention, the cutting conditions and the cutting speed for cutting a curved surface, the height of the plasma torch, the angle of the plasma torch, and the plasma gas flow rate are stored in advance in the cutting condition storage unit of the control device. The shape information storage unit stores shape information including the shape to be cut and the angle of the plasma torch in the cutting region in the shape, and the determination unit stores in advance the angle range of the plasma torch corresponding to the region to be curved cut Thus, when the plasma torch angle of the cutting area constituting the shape information is within the stored plasma torch angle range, the cutting area can be determined as the curved surface cutting area.

  That is, in the plasma cutting, since the cutting groove opens upward, the vertical cutting plane cannot be formed if the axis of the plasma torch is arranged perpendicular to the surface of the workpiece. For this reason, when it is desired to obtain an accurate vertical cut surface, the axis of the plasma torch is inclined to the scrap side with respect to the surface of the material to be cut within a range of about 3 degrees to 10 degrees (-3 degrees to -10 degrees). become. Also, in a portion where the cut surface is slightly inclined, no problem is caused. The axis of the plasma torch is set to be perpendicular (0 degree) to the surface of the material to be cut.

  Accordingly, the cutting area in the shape to be cut is a cutting area aiming at a substantially vertical cutting surface or a cutting area aiming at a groove cutting surface. The optimum plasma torch angle is set.

  For this reason, when the angle of the plasma torch is specifically designated for the cutting region in the shape to be cut, it is determined whether the designated cutting region is a vertical cutting region or a groove cutting region. be able to. Therefore, the determination unit stores the angle range (for example, 0 degrees to -10 degrees) of the plasma torch that is a condition for cutting the curved surface with respect to the shape to be cut in advance, so that the determination unit performs cutting. It can be discriminated whether the cutting area in the power shape is the area to be cut by the curved surface or the other cutting area, that is, the groove cutting area.

  Therefore, when cutting the material to be cut and the plasma torch reaches the curved surface cutting area, the cutting condition for cutting the edge into a curved surface is read out, and the operation part is controlled under the corresponding condition to cut the curved surface. can do. For this reason, it is possible to perform curved surface cutting in accordance with the angle of the plasma torch in the shape without specially specifying the curved surface cutting region in the target shape to be cut.

  Further, even if the control device has an angle of the plasma torch of the cutting region in the shape to be cut within a range corresponding to the curved surface cutting region, there is information that makes this cutting region a region that does not cut the curved surface. In some cases, a cutting plane substantially perpendicular to the cutting region can be formed.

It is a schematic diagram explaining the structure of a cutting device. It is a schematic diagram explaining the structure of a plasma torch. It is a block diagram of a control system. It is a figure explaining the cut surface when cut | disconnecting a to-be-cut material curved surface.

  Hereinafter, embodiments of the plasma cutting apparatus according to the present invention will be described.

  First, the shape of the cut surface of the material C to be cut by the plasma torch B constituting the cutting apparatus A will be described with reference to FIG. In the figure, the workpiece C is cut and the upper edge 31a of the cut surface 31 is cut into a curved surface (hereinafter referred to as curved cutting or R cutting). The radius of the curved surface at the upper edge 31a is not particularly limited, and may be a curved surface that makes it difficult for the coating film to be peeled off when painted. The radius constituting such a curved surface is required to be 2 mm to 3 mm at a minimum, and any curved surface having a radius larger than this may be used.

  Next, the configuration of the cutting apparatus A and the configuration of the plasma torch B will be described with reference to FIGS.

  As shown in FIG. 2, the plasma torch B has an electrode 1 disposed at the center, and a nozzle 2 and a shield nozzle 3 are provided around the electrode 1. The electrode 1, nozzle 2 and shield nozzle 3 are detachably mounted on the torch body 4 respectively. A plasma gas flow path 2 a formed in the torch body 4 is opened between the electrode 1 and the nozzle 2, and a shield gas formed in the torch body 4 is formed between the nozzle 2 and the shield nozzle 3. The flow path 3a is opened.

  The electrode 1 and the nozzle 2 are configured to be water cooled.

  A hose 2b is connected to the plasma gas flow path 2a formed in the torch body 4, and this hose 2b is connected to an electromagnetic valve 2c and a flow rate regulator 2d. Similarly, a solenoid gas 3c and a hose 3b connected to the flow rate regulator 3d are connected to the shield gas flow path 3a. Each of the flow rate regulators 2d and 3d is supplied with a gas from a gas supply device 5 constituted by a cylinder 5a or factory piping and a pressure regulator 5b.

  The flow rate regulators 2d and 3d are configured to exhibit a function as a gas flow rate control device that varies the flow rate to be supplied in accordance with a signal from the control device 21 described later.

  A conductive member 6 a disposed in the torch body 4 is connected to the electrode 1, and a conductive member 7 a disposed in the torch body 4 is similarly connected to the nozzle 2. The conductive member 6a is connected to the power source 8 via the cap tire 6b, the conductive member 7a is connected to the switching member 9 via the cap tire 7b, and is further connected to the power source 8. The material to be cut C is connected to the switching member 9 via the cap tire 10 and further connected to the power source 8.

  The power source 8 is configured to be able to vary a current value to be applied to the electrode 1 in accordance with a signal from the control device 21 described later.

  In the plasma torch B configured as described above, the gas supply device 5 is operated to supply a gas adjusted to a preset pressure, the electromagnetic valve 2 c is opened, and the plasma gas is interposed between the electrode 1 and the nozzle 2. After performing a preflow for a predetermined time, the electrode 1 and the nozzle 2 are energized to form a pilot arc. When this pilot arc is injected toward the workpiece C and the arc contacts the workpiece C, the solenoid valve 3c is opened and the nozzle 2 is supplied with a shielding gas between the shield nozzles 3 and simultaneously switched. By operating the member 9 to energize between the electrode 1 and the material to be cut C and stop energization between the electrode 1 and the nozzle 2, a main arc for cutting the material to be cut C is formed.

  The cutting device A has a moving device D that carries the plasma torch B and moves the region of the material C to be cut. As shown in FIG. 1, the moving device D is disposed in a direction orthogonal to a pair of rails 11 laid in parallel, a saddle 12 a movably mounted on the rails 11, and the laying direction of the rails 11. The gate-type frame 12 having the cross girder 12b and the traverse carriage 13 mounted so as to be traversable along the cross girder 12b of the frame 12 are configured.

  The saddle 12 a of the frame 12 is provided with a traveling motor 14 that causes the frame 12 to travel along the rail 11, and the transverse carriage 13 is provided with a transverse motor 15 that transverses the carriage 13 in a direction perpendicular to the rail 11. It has been.

  In addition, a plasma torch B is mounted on the transverse carriage 13, and an inclination of the upper and lower motors 16 and the plasma torch B that moves the plasma torch B in the axial direction of the plasma torch B so as to be separated or approached to the material C to be cut. A torch angle axis motor 17 is provided for inclining the angle corresponding to the target angle.

  Therefore, the torch angle axis motor 17 and the vertical motor 16 are driven to adjust the inclination angle and height of the plasma torch B with respect to the workpiece C, and thereafter the traveling motor 14 and the traversing motor 15 are driven and controlled in synchronization. Thus, the plasma torch B can be moved two-dimensionally.

  In FIG. 1, reference numeral 18 denotes a control panel incorporating a control device to be described later. A gas supply device 5 for supplying each gas to the plasma torch B and a power source 8 for energizing between the electrode 1 and the workpiece C are not mounted on the frame 12 but are installed at predetermined positions near the rail 11. The Furthermore, the moving device D in the present invention does not necessarily require the gate-shaped frame 12, but the plasma torch B is two-dimensionally cut so that a plurality of members can be cut from the material to be cut C in a single stroke. Anything that can be moved to is acceptable.

  Next, a control device for controlling the cutting device A according to the present embodiment will be described with reference to FIG. In the figure, 21 is a control device and 21a is a control unit.

  In 21b, for example, a basic program for performing piercing work or cutting on the workpiece C is written, and cutting current, cutting speed, plasma torch height, plasma torch angle when performing R cutting. A program storage unit serving as a cutting condition storage unit in which a cutting condition including a plasma gas flow rate is written.

  21c is the shape of the member to be cut from the material to be cut C, the angle of the plasma torch corresponding to each cutting region in the shape, the starting point and the ending point for each cutting region, and between the starting point and the ending point for each cutting region The shape information storage unit stores shape information including a route and the like.

  In particular, the angle of the plasma torch set corresponding to each cutting region is coded as “A” in the program. For example, when “A-5.5” is designated, the angle of the plasma torch B Is controlled in a state tilted 5.5 degrees toward the scrap side.

  21d is information on the cutting start position of the shape with respect to the material to be cut C, information on the material to be cut such as the plate thickness and material of the material to be cut C, and should be cut from the input / output unit 21f constituting the input unit This is a temporary storage unit that temporarily stores information including information (cancellation information) for designating cancellation of R-cutting in spite of being an R-cutting region in the shape.

  Cancel information for designating cancellation of R cutting is coded as “M57” in the program. Then, it corresponds to a cutting area that forms a substantially vertical cutting plane in the shape to be cut and the upper edge should not be R-cut (for example, the area designated as “A-5.5”). For example, by designating “M57” (“M57” “A-5.5”), the plasma torch B is simply tilted by −5.5 degrees without R cutting the designated cutting region. It is comprised so that the to-be-cut material C may be cut | disconnected by.

  21e stores in advance an angle range (for example, 0 ° to −10 °) of a plasma torch corresponding to the region to be R-cut, and plasma in the cutting region in the shape to be cut stored in the shape information storage unit 21c. When the angle of the torch is within the stored angle range of the plasma torch, the determining unit determines that the upper edge is an R-cut region that cuts into a curved surface. Therefore, the cutting area other than the R cutting area determined by the determination unit is the groove cutting area.

  Reference numeral 22 denotes an input device such as a keyboard for inputting information such as information on members to be cut from the material to be cut C and information that affects cutting conditions including the plate thickness. Information input from the input device 22 is transmitted via the input / output unit 21f.

  The cutting conditions written in the program storage unit 21b are the cutting current applied to the electrode 1 of the plasma torch B, the cutting speed corresponding to the plate thickness of the workpiece C, the height of the plasma torch B from the workpiece C, the plasma The inclination angle of the torch B, and the flow rate of the plasma gas supplied between the electrode 1 and the nozzle 2 of the plasma torch B. Each piece of data constituting the cutting condition is written in a matrix set for each thickness of the material C to be cut and each angle of R cutting or groove cutting.

  Therefore, the cutting condition data corresponding to the angle of the cutting plane included in the shape information stored in the shape information storage unit 21c is read by using the input device 22 to inform the thickness of the material C to be cut. Based on this data, the flow rate regulators 2d and 3d, the power source 8, and the motors 14 to 17 are driven independently or synchronously.

  The cutting condition for R-cutting the workpiece C is a value when the workpiece C is cut substantially perpendicularly or accurately vertically (both cuts are collectively referred to as “vertical cutting”). Is the reference data. In this reference data, a tilt angle of about 10 degrees at maximum is set for the plasma torch B. Further, the cutting conditions for cutting the groove C of the workpiece C are as follows: the groove angle specified by the inclination angle of the plasma torch B and the workpiece C of the plasma torch B accompanying the inclination of the plasma torch B. The height of the plasma torch B corresponding to this distance and the cutting speed corresponding to the apparent plate thickness corresponding to the groove angle.

  The cutting conditions required for vertical cutting as described above and the cutting conditions required for groove cutting differ in the inclination angle of the plasma torch B, the height of the plasma torch B from the workpiece C, and the cutting speed. Other conditions, i.e., cutting current and plasma gas flow rate are the same.

  When performing R cutting on the workpiece C, the cutting current, cutting speed, plasma torch B height, plasma torch B angle, and plasma gas flow rate were selected with respect to the reference data for vertical cutting. At least one condition is changed.

  For example, when changing the cutting current, it is possible to realize R cutting by raising the cutting current after the change to the cutting current at the time of vertical cutting. Further, when changing the cutting speed, it is possible to realize R cutting by similarly increasing the cutting speed. Further, when the height of the plasma torch B is changed, it is possible to realize R cutting by raising the height. When the angle of the plasma torch B is changed, the plasma torch B enters the product side from the front surface side to the back surface side of the material C to be cut (so as to be inclined in a direction opposite to the inclined direction of the cut surface). It is possible to realize R cutting by inclining. Furthermore, when the plasma gas flow rate is changed, it is possible to realize R cutting by increasing the flow rate.

  As described above, when performing R cutting, it is sufficient to change at least one cutting condition, but it is not necessarily limited to one, and two or three cutting conditions may be changed simultaneously. Is natural. For example, by increasing the cutting current and changing the angle of the plasma torch B, and further increasing the plasma gas flow rate in addition to the two cutting conditions described above, the upper edge 31a of the cutting surface 31 can be made stable. It becomes possible to realize curved R cutting.

  A procedure for performing R cutting on a cutting region in a shape to be cut from the material to be cut C by the cutting apparatus A according to the present embodiment will be described.

  As described above, the program necessary for cutting and cutting condition information for R cutting are stored in the program storage unit 21b in advance. In addition, the determination unit 21e stores an angle range (0 degrees “A0.0” to −10 degrees “A-10.0”) of the plasma torch B that serves as a reference for R cutting.

  The input device 22 inputs shape information including a target shape to be cut from the workpiece C and angle information of the plasma torch B in the shape. That is, when the cutting area in the target shape includes vertical cutting and groove cutting, the start point and end point of the cutting area to be vertically cut and the angle of the plasma torch B (0 degree to -10 degrees), the groove cutting. The shape information including the angle (15 to 45 degrees) of the plasma torch B corresponding to the start point and end point of the cutting region to be cut and the groove angle is input.

  In particular, when a shape to be cut is programmed, when it is determined in advance that a cutting area is to be cut vertically in the shape and the vertical cutting is performed without performing R cutting, the R for the corresponding cutting area is determined. Cancel information (“M57”) for canceling the cutting is input.

  The shape information and cancellation information input as described above are transmitted to the control device 21 and stored in the shape information storage unit 21c.

  After the information necessary for cutting the workpiece C is input to the control device 21, information indicating that cutting should be started is input from the input device 22.

  In response to the information to start cutting, the control unit 21a reads a program necessary for cutting from the program storage unit 21b and controls the corresponding operating device.

  Further, the control unit 21a reads the A code, recognizes the angle of the plasma torch B in the cutting area in the shape to be cut stored in the shape information storage unit 21c, and recognizes the recognized angle of the plasma torch B; The angle range of the plasma torch B designated to be R-cut stored in the determination unit 21e in advance is compared. As a result of this comparison, if the angle of the plasma torch B of the cutting region in the shape to be cut is within the previously stored angle range of the plasma torch B, it is determined that the cutting region is an R cutting region. If it is not within the range, it is determined that it is not the R cutting region.

  Further, the M57 code is read simultaneously with the reading of the A code, and the cutting region associated with the read M57 is determined as a region in which normal plasma cutting is performed with the angle of the plasma torch B in the cutting region.

  For example, in the shape stored in the shape information storage unit 21c, a certain cutting region is vertical cutting, and the angle of the plasma torch B in this cutting region is −7 degrees (“A-7.0”). And the other cutting region is groove cutting, and the angle of the plasma torch B in this cutting region is specified to be 25 degrees (“A25.0”), it is stored in the determination unit 21e. Since the angle of the plasma torch B for R-cutting is in the range of 0 degrees to -10 degrees, the discriminating unit 21e selects a cutting region in which the angle of the plasma torch B is designated as “A-7.0”. It is possible to determine as an R cutting area and to determine a cutting area designated as “A25.0” as an area that should not be R cut.

  In the control unit 21a, a matrix of cutting conditions corresponding to the result determined by the determination unit 21e is read from the program storage unit 21b, and the plasma power source 8, the torch angle axis motor 17, the vertical motor 16, the gas flow rate according to the read data. Controls the control devices 2d and 3d. At the same time, the driving of the traveling motor 14 and the traversing motor 15 is controlled based on the shape information of the shape to be cut, and the plasma torch B is moved.

  The control unit 21a and the determination unit 21e determine whether the next cutting region is an R cutting region or a groove cutting region every moment, and read and read a matrix of corresponding cutting conditions according to the determination result. The plasma power supply 8, the torch angle axis motor 17, the vertical motor 16, and the gas flow rate control devices 2d and 3d are controlled in accordance with the cutting conditions.

  When the cancel information stored in the shape information storage unit 21c or the cancel information stored in the primary storage unit 21d is read in the process of cutting the shape to be cut as described above, this cancel information is read out. Even if the angle of the plasma torch B in the cutting region associated with the cutting angle corresponds to the R cutting region, the cutting conditions are not changed to the conditions corresponding to the R cutting, and the cutting conditions suitable for normal vertical cutting It is cut off.

  Therefore, even when the vertical cutting region and the groove cutting region are mixed in one planar shape, the discrimination unit 21e of the control device 21 determines the angle of the plasma torch B designated for each region to be cut and the R cutting. It is possible to accurately discriminate by comparing with the angle range of the plasma torch B designated for performing the cutting, and performing R cutting or groove cutting while continuously cutting based on the determined result Is possible.

  Since the plasma cutting apparatus of the present invention can continuously cut the R-cut or the groove cut with respect to the material C to be cut, it is used when cutting the material to be cut to coat the cut surface and surface. It is advantageous.

A cutting device B plasma torch C material to be cut D moving device 1 electrode 2 nozzle 3 shield nozzle 2a, 3a flow path 2b, 3b hose 2c, 3c solenoid valve 2d, 3d flow regulator, gas flow control device 4 torch body 5 gas Supply device 6a, 7a Conductive member 6b, 7b Cap tire 8 Power supply 11 Rail 12 Frame 13 Traverse carriage 14 Traveling motor 15 Traverse motor 16 Vertical motor 17 Torch angle shaft motor 18 Control panel 21 Control device 21a Control unit 21b Program storage unit 21c Shape information Storage unit 21d Temporary storage unit 21e Discriminating unit 21f Input / output unit 22 Input device 31 Cutting surface 31a Upper edge

Claims (2)

  A plasma torch for supplying a plasma gas around an electrode and injecting a plasma arc from a nozzle to cut a material to be cut, a moving device for moving the plasma torch according to a target cutting path, and an electrode for the plasma torch Control device for controlling cutting current, plasma gas flow rate, plasma torch moving speed, height of plasma torch from workpiece and tilt angle of plasma torch to workpiece, and cutting workpiece vertically Or a plasma cutting apparatus that vertically cuts and bevels a workpiece, or cuts the groove, and the control device cuts the upper edge of the cut surface into a curved surface and the cutting current and cutting speed. And a cutting condition storage unit that stores cutting conditions for curved surface cutting composed of the height of the plasma torch, the angle of the plasma torch, and the plasma gas flow rate. A shape information storage unit for storing shape information including a shape to be cut and a plasma torch angle of the cutting region in the shape, and a shape range storing the angle range of the plasma torch corresponding to the region to be curved in advance. A discriminating unit that discriminates the upper edge as a curved surface cutting region that cuts into a curved surface when the angle of the plasma torch of the cutting region in the shape stored in the storage unit is within the angle range of the plasma torch; At least one condition is read out from the cutting conditions consisting of the cutting current and cutting speed, the plasma torch height, the plasma torch angle and the plasma gas flow rate stored in the cutting condition storage unit corresponding to the curved surface cutting area. Cutting current applied to the electrode of the plasma torch, plasma gas flow rate, plasma torch moving speed, and plasma torch coverage A control unit for controlling the angle of inclination with respect to the cutting object height and the plasma torch from the cross member, a plasma cutting device characterized in that it comprises a.   The control device is such that the angle of the plasma torch in the cutting region in the shape to be cut from the material to be cut is in the angle range of the plasma torch corresponding to the region to be cut in the curved surface stored in the determination unit in advance. Has a discriminating unit that discriminates as a region to be cut with a cutting condition suitable for normal vertical cutting, without changing to a condition corresponding to curved surface cutting The plasma cutting device according to claim 1.

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