JP5923480B2 - Groove machining method, groove machining program, control system, and plasma cutting apparatus - Google Patents

Description

  The present invention relates to a groove processing method, a groove processing program, a control system, and a plasma cutting apparatus for efficiently forming a Y groove shape portion on a workpiece by plasma processing.

  As is well known, when a workpiece such as a steel plate is cut by plasma processing, an arc is generated between the electrode provided in the nozzle and the workpiece, and the working gas is turned into plasma, and the working gas is turned into plasma. By rotating and supplying an assist gas, which is a secondary gas, around the substrate, a plasma gas in which a swirl flow is formed is injected from the plasma torch and the workpiece is cut by the plasma gas. ing. (For example, refer to Patent Document 1). Also in the Y groove cutting, the Y groove shape portion is generally formed using the plasma processing.

In the conventional plasma processing, for example, the Y groove shape portion is formed by the procedure as shown in FIG.
First, as shown in FIG. 9A, for example, plasma gas P having a clockwise swirling flow formed around it is injected from the plasma torch 102, and the plasma torch 102 moves in the direction indicated by the arrow V111. When the route surface is formed on the workpiece W, when the swirl flow of the plasma gas P is a right turn, the traveling direction is on the right side (see FIG. 9A). A root surface R101 of the Y groove shape portion is formed.

  Next, as shown in FIG. 9B, the plasma torch 102 is returned to the position where the cutting of the route surface R101 is started, as indicated by an arrow V112 indicated by a broken line, and the plasma torch 102 is opened corresponding to the groove surface K101. Tilt according to the tip angle θ.

Next, as shown in FIG. 9C, the plasma torch 102 is moved to the arrow V113 along the locus corresponding to the groove surface K101 in the same direction as when the root surface is cut.
Thus, by performing FIG. 9A to FIG. 9C, a Y groove shape portion as shown in FIG. 9D is formed.

  By the way, when forming such a Y groove shape portion, if the velocity V113 of the plasma torch 102 when forming the groove surface K101 is simply set in correspondence with the equivalent plate thickness in the Y groove shape portion, It is known that a corner portion where the groove surface K101 and the route surface R101 intersect is melted and rounded.

  Furthermore, since the molten metal generated when forming the groove surface continuously adheres to the route surface R101 and deteriorates the quality of the route surface R101, generally, when forming the groove surface K101. In general, cutting is performed in a state where the moving speed V113 of the plasma torch 102 is reduced by, for example, about 70% compared to the normal moving speed calculated from the equivalent plate thickness in the Y groove shape portion. is there.

JP-A-7-178559

  However, in order to ensure the quality of the root surface, the moving speed of the plasma torch when cutting the groove surface is greatly reduced from the moving speed calculated from the equivalent plate thickness in the Y groove shape portion. However, since the processing time required for forming the Y groove shape portion becomes long, there arises a problem that the processing cost for forming the Y groove shape portion increases.

  Therefore, when the Y groove shape portion is formed by plasma processing, the inventors have suppressed the corner portion between the groove surface and the root surface from melting and rounding, thereby making the Y groove shape portion efficient. As a result of diligent research on the groove processing technology that can be formed in the process, when cutting the groove surface, the plasma gas swirl flow is to the left in the direction of travel when turning right, and when turning to the left It has been found that when a groove surface is formed on the right side of the traveling direction, the corner portion between the groove surface and the root surface is prevented from melting and rounding. Furthermore, the present inventors have grasped that the molten metal generated when forming the groove surface is prevented from continuously adhering to the root surface.

  This means that if the direction of the swirl flow of the plasma gas when forming the root surface and the groove surface is the same, the direction of the plasma torch when the groove surface is formed is the root surface. By moving in the opposite direction to the case, it is possible to prevent the corners from melting and rounding, thereby improving the quality of the root surface.

  Furthermore, although the cutting mechanism is still under study, if a groove surface is formed on the side where the direction of the swirling flow of the plasma gas is the same as the movement of the plasma torch, even if the moving speed of the plasma torch is increased, The molten metal is prevented from continuously adhering to the root surface, and the moving speed of the plasma torch when forming the groove surface can be set higher than the moving speed when forming the conventional groove surface. The knowledge that it was possible was obtained.

  The present invention has been made in view of the above circumstances, and injecting a plasma gas having a swirling flow around from a plasma torch to form a Y groove shape portion on a workpiece, When cutting the groove surface, the corner portion between the groove surface and the root surface can be prevented from melting and rounding, and the Y groove shape portion can be efficiently formed. It is an object of the present invention to provide a groove processing method, a groove processing program, a control system, and a plasma cutting apparatus capable of suppressing molten metal generated during formation from adhering to a root surface.

In order to solve the above problems, the present invention proposes the following means.
The invention according to claim 1 is a groove processing method for forming a Y groove shape portion in a workpiece while injecting and moving a plasma gas in which a swirl flow is formed from a plasma torch. the torch was moved while injecting plasma gas, to the right side in the traveling direction when the swirling flow is seen right turn from the plasma torch, leftward in the traveling direction in the case of a left turn as seen from the plasma torch It forms a root surface, moves while inclining the plasma torch with respect to the workpiece and injects plasma gas, and proceeds when the swirl flow of the plasma gas turns right as viewed from the plasma torch In the case of a left turn as viewed from the plasma torch on the left side in the direction, a groove surface is formed on the right side in the traveling direction.

According to a third aspect of the present invention, there is provided a platen for placing a workpiece, a plasma torch for injecting a plasma gas having a swirl flow around it, and the plasma torch according to an input groove angle. A groove processing program for forming a Y groove shape portion by a plasma cutting device comprising a torch attitude control means for tilting and a torch position control means for moving the plasma torch in accordance with an inputted scheduled cutting site. When the plasma torch moves while jetting plasma gas, and the swirl flow of the plasma gas turns right as seen from the plasma torch, it turns to the right in the direction of travel, and turns left as seen from the plasma torch. In this case, a route plane is formed on the left side in the traveling direction, the plasma torch is inclined with respect to the workpiece and moved while jetting plasma gas, and the plasma Leftward in the traveling direction in case the scan of the swirling flow is seen right turn from the plasma torch, in the case of a left turn as seen from the plasma torch is configured to form a groove surface to the right side in the traveling direction It is characterized by being.

  The invention described in claim 5 is a control system, comprising the groove machining program according to claim 3 or 4.

  A sixth aspect of the present invention is a plasma cutting apparatus, comprising the control system according to the fifth aspect.

According to the groove processing method, the groove processing program, the control system, and the plasma cutting device according to the present invention, the plasma gas injected from the plasma torch when forming the groove surface in the Y groove shape portion by plasma processing When the swirl flow is a right turn when viewed from the plasma torch , a groove surface is formed on the left side in the traveling direction, and on the left side when viewed from the plasma torch , the groove surface is formed on the right side in the traveling direction. It is possible to prevent the corners between the root surface and the root surface from melting and rounding, and consequently to prevent the molten metal produced when forming the groove surface from continuously adhering to the root surface. Can do.

  Furthermore, if the groove surface is formed on the side where the direction of the swirling flow of the plasma gas is in the same direction as the movement of the plasma torch, the movement speed of the plasma torch is more than the movement speed when the conventional groove surface was formed. Even at a high speed, it is possible to prevent the molten metal from continuously adhering to the root surface, and to increase the moving speed of the plasma torch when forming the groove surface.

  The invention according to claim 2 is the groove processing method according to claim 1, wherein after forming the root surface, the plasma torch is tilted and moved while jetting plasma gas to move the groove. When forming a surface, the plasma torch on which the route surface is formed is moved in a direction opposite to that when the route surface is formed.

  According to a fourth aspect of the present invention, there is provided the groove processing program according to the third aspect, wherein after forming the root surface, the plasma torch is inclined to move and open while injecting plasma gas. When forming the front surface, the plasma torch forming the route surface is moved in the opposite direction to the formation of the route surface to form the groove surface.

According to the groove machining method and the groove machining program according to the present invention, after the root surface is formed, the plasma torch is tilted, and the plasma torch is moved toward the opposite side when the root surface is formed. Therefore, the direction of the swirling flow can be made the same as the moving direction of the plasma torch without changing the plasma torch.
Furthermore, it is not necessary to move the plasma torch to the starting position at the start of cutting the root surface by moving the plasma torch in the opposite direction to when the root surface is formed. You can save time.

According to the groove processing method, the groove processing program, the control system, and the plasma cutting device according to the present invention, the corner portion between the groove surface and the root surface is prevented from melting when the groove surface is cut. be able to.
Further, it is not necessary to greatly reduce the moving speed of the plasma torch when cutting the groove surface, and the groove surface can be formed efficiently.

It is a figure showing the schematic structure of the plasma cutting device concerning one embodiment of the present invention. It is a figure which shows schematic structure of the plasma torch concerning one Embodiment of this invention, (A) is a longitudinal cross-sectional view of a plasma torch, (B) is a perspective view of the state which decomposed | disassembled the nozzle of the plasma torch. It is a front view which shows schematic structure of the plasma torch and plasma torch holding member which concern on one Embodiment of this invention. It is a side view which shows schematic structure of the plasma torch and plasma torch holding member which concern on one Embodiment of this invention. It is a flowchart explaining the procedure which forms the Y groove shape part which concerns on one Embodiment of this invention. It is a figure explaining the effect | action of the plasma gas at the time of forming a root surface in the groove processing which concerns on one Embodiment of this invention, (A) looks at plasma gas toward the front-end | tip from the axial direction base end of a plasma torch. (B) has shown the figure which looked at the advancing direction front from the back of the advancing direction of the plasma torch. It is a figure explaining the effect | action of the plasma gas at the time of forming a groove surface in the groove processing which concerns on one Embodiment of this invention, (A) is toward the front-end | tip from the axial direction base end of a plasma torch. (B) shows a view seen from the front in the traveling direction of the plasma torch toward the rear in the traveling direction. It is a figure which shows the outline of the process sequence of the Y groove shape part which concerns on one Embodiment of this invention, (A) shows the state which a root surface forms, (B) shows the state which a groove surface forms. C) is a perspective view showing a state in which a Y groove shape portion is formed. It is a figure explaining the Example for confirming the effect of this invention, (A) is an Example of this invention, (B) is a photograph explaining a comparative example. It is a perspective view explaining the outline of the procedure which forms Y groove shape part by a prior art.

Hereinafter, an embodiment of the present invention will be described with reference to FIGS.
FIG. 1 is a diagram illustrating a schematic configuration of an apparatus according to an embodiment, FIG. 2 is a diagram illustrating an example of a schematic configuration of a plasma torch, and FIG. 2A is a longitudinal sectional view of a plasma torch. FIG. 2B shows a perspective view of the plasma torch nozzle in an exploded state. In FIG. 1, reference numeral 1 denotes a plasma cutting apparatus, reference numeral 2 denotes a plasma torch, and reference numeral 20 denotes a control system for driving the plasma cutting apparatus 1 based on a preset groove processing program.

  As shown in FIG. 1, the plasma cutting device 1 includes a plasma torch 2, a surface plate 3, an alignment mechanism 4, and a control system 20.

  The plasma torch 2 is configured to cut the workpiece W by spraying the plasma gas from a nozzle formed at the tip of the plasma torch 2 by converting the working gas into plasma and generating plasma gas.

In this embodiment, for example, a double swirl type torch can be applied to the plasma torch 2, and the secondary gas is disposed around the swirling flow of the plasma gas in which the working gas is converted into plasma by the plasma arc. By supplying this swirl flow, an assist gas swirl flow is formed around the plasma gas, and this plasma gas is ejected from the nozzle.
Needless to say, not only the double swirl method but also other swirl type torches can be used.

Specifically, for example, as shown in FIGS. 2A and 2B, a conical first nozzle 51 is disposed at the front end portion of the nozzle base 50, and a hollow in the first nozzle 51 is formed. An electrode part (not shown) for plasma generation is inserted into the part from the nozzle base 50 side.
Further, the working gas constituting the plasma gas is supplied from the opening of the base end side of the nozzle base 50 so that the working gas is ejected through the first ejection port 52 formed at the distal end of the first nozzle 51. It has become.

  On the front side of the first nozzle 51, a conical second nozzle 54 having a second ejection port 53 at the tip is disposed so as to cover the first nozzle 51. Between the second nozzle 54 and the first nozzle 51, a circulation space 55 is formed through which assist gas serving as a secondary gas is circulated.

  Further, a swirl flow imparting means 60 for imparting swirl to the flow of the assist gas flowing in the flow space 55 is integrally formed on the outer surface side of the first nozzle 51. As shown in FIG. 2B, the swirling flow applying means 60 is inclined on the conical outer surface of the first nozzle 51 at an angle of, for example, 70 degrees with respect to the axial direction of the first nozzle 51. Grooves 61 are formed at equal intervals.

  In such a plasma torch 2, the working gas (for example, high-purity oxygen gas) is supplied around the electrode portion (not shown) disposed in the first nozzle 51, and the first and second electrode portions are connected to the first torch 1. The nozzle 51 is discharged to form a pilot arc, and the formed pilot arc is sprayed from the nozzle toward the workpiece W by the working gas and brought into contact with the workpiece W, thereby contacting the electrode and the workpiece. Plasma is formed with the material W.

  The workpiece W is melted by the heat of the plasma and combustion is promoted by the working gas, and the melt is removed by the pressure of the injection to form a machining groove in the workpiece W. Further, the plasma is protected and the shape is adjusted by the assist gas (for example, air) serving as the secondary gas supplied through the circulation space 55 and the groove 61 of the circulation flow applying means 60.

The surface plate 3 is for placing the workpiece W to be processed by the plasma torch 2, and the carriage moves on the upper surface of the surface plate 3 in the traveling direction (hereinafter referred to as the X-axis direction). The rails are arranged.
A later-described plasma torch holding member 10 disposed on the carriage is movable in the transverse direction (hereinafter referred to as the Y-axis direction), and the upper surface of the surface plate 3 is composed of an X-axis and a Y-axis. Further, it is a flat surface along the XY plane.

  As shown in FIGS. 3A and 3B, the alignment mechanism 4 includes a plasma torch holding member 10 that holds the plasma torch 2, an inclination mechanism (torch attitude control means) 15, and a movement mechanism (torch position control means) 16. It has.

The tilt mechanism 15 rotates the plasma torch 2 held by the plasma torch holding member 10 to give a desired tilt angle.
The moving mechanism 16 moves the plasma torch 2 along with the plasma torch holding member 10 on the surface plate of the plasma cutting apparatus 1 in the X-axis direction (traveling direction) and the Y-axis direction (transverse direction).

In this embodiment, the plasma torch 2 is positioned above the surface plate 3, and plasma is injected in the direction O1 of the plasma torch 2 (hereinafter referred to as the torch axis) to process the workpiece W such as a steel plate. Grooves are to be machined.
A machining point is formed at the intersection of the torch axis O1 of the plasma torch 2 and the machining surface of the workpiece W, and a path along which the machining point has moved, that is, a machining groove corresponding to the machining locus is formed, so that the workpiece is processed. W is cut to form cut surfaces (for example, a root surface and a groove surface) constituting the groove shape portion.

  For example, as shown in FIGS. 3A and 3B, the plasma torch holding member 10 includes a first arm 12A, a second arm 12B, and a third arm 12C that extend in the vertical direction, and are orthogonal to the Z axis. A first shaft 13A, a second shaft 13B, and a third shaft 13C are provided.

  The second arm 12B is disposed on the distal end side of the first arm 12A and is rotatable around the first shaft 13A. The third arm 12C is disposed on the distal end side of the second arm 12B. The plasma torch 2 is provided through a third shaft 13 </ b> C provided on the distal end side of the third arm 12 </ b> C.

  The first shaft 13A and the second shaft 13B, the second shaft 13B and the third shaft 13C are connected by timing belts 14A and 14B, respectively, and the second arm 12B is rotated around the first shaft 13A. In this case, the first arm 12A, the third arm 12C, the second arm 12B, and the torch axis O1 are rotated in parallel with each other.

  Further, the plasma torch 2 is perpendicular to the surface plate 3 and is rotatable about an axis O2 passing through the processing point. As a result, even if the inclination angle of the plasma torch 2 changes, the relative position between the machining point on the machining surface and the tip of the plasma torch 2 is maintained.

  The tilting mechanism 15 includes an A-axis motor 15A and a B-axis motor 15B. The A-axis motor 15A is connected to the first shaft 13A, and rotates the second arm 12B around the first shaft 13A. An inclination angle is given to the torch axis O1 of the torch 2.

The B-axis motor 15B controls the direction of the torch axis O1 in the XY plane by rotating the plasma torch 2 around the axis O2.
By combining the rotation angles of the A-axis motor 15A and the B-axis motor 15B, the torch axis O1 can be directed to an arbitrary direction of the surface plate 3 viewed in plan with a desired inclination angle. .

  The tilt angle refers to an angle at which the torch axis O1 in a plane perpendicular to the relative moving direction intersects the processing surface of the workpiece W when the plasma torch 2 moves relative to the surface plate 3. In other words, it refers to an angle at which the torch axis O1 on the surface in the normal direction (direction perpendicular to the tangent line) of the processing locus intersects the processing surface.

The moving mechanism 16 includes an X-axis direction moving mechanism 16X that moves the carriage on which the plasma torch holding member 10 is disposed in the traveling direction (X-axis direction), and the plasma torch holding member 10 on the carriage in the transverse direction (Y-axis direction). And a Y-axis direction moving mechanism 16Y.
The moving mechanism 16 drives the plasma torch holding member 10 and the plasma torch 2 in the X-axis direction and the Y-axis direction based on the X-axis direction control signal and the Y-axis direction control signal output from the calculation unit 22 to the driver 26. Thus, the plasma torch 2 is moved to a predetermined XY coordinate position.

  Further, the moving mechanism 16 includes a Z-axis direction moving mechanism 16Z that enables the plasma torch holding member 10 to move in the height direction (Z-axis direction). Connected to the torch holding member 10, the height of the plasma torch holding member 10 can be changed as necessary, and the distance between the tip of the plasma torch 2 and the workpiece W can be adjusted. .

The control system 20 includes an input unit 21, a calculation unit 22, a hard disk 24, a driver 26, and a memory (not shown) for storing an NC program, and the hard disk 24 includes a database (not shown). .
The database stores, for example, a control program for controlling the machining trajectory of the plasma torch 2, the tilt angle of the plasma torch 2, and the like, and numerical data relating to the flow rate and cutting speed of the secondary gas.
Whether the groove machining program is configured by one or both of the control program and the NC program that defines the operation of the control program can be arbitrarily set.

  The input unit 21 is for inputting data related to the groove shape portion to the calculation unit 22, for example, the material of the workpiece W, the plate thickness (including the equivalent plate thickness), the processing locus of the plasma torch 2, Various data for forming the groove shape portion such as the groove angle θ can be input.

  For example, the calculation unit 22 executes a groove machining program stored in the hard disk 24 and controls the alignment mechanism 4 (the tilting mechanism 15 and the moving mechanism 16) based on the data input from the input unit 21. Control data such as the angle of the plasma torch 2, working gas flow rate, current value, secondary gas flow rate, machining speed, torch height, etc. are calculated, and this control data is output to the alignment mechanism 4 to generate the plasma torch. 2 to form a workpiece.

  Hereinafter, with reference to FIGS. 4-6, the operation | movement procedure and effect | action of the plasma torch 2 which concern on one Embodiment are demonstrated. FIG. 4 shows a flowchart relating to a program for operating the plasma torch 2 by the control system 20. FIG. 5 shows the operation of the plasma torch 2 when forming the root surface, and FIG. 6 shows the operation of the plasma torch 2 when forming the groove surface.

[Step 1]
First, as shown in FIG. 4, data (for example, material, plate thickness, processing locus, groove angle θ, etc.) for processing the Y groove shape portion is input from the input unit 21 (S1).
[Step 2]
Next, the calculation unit 22 refers to data for processing the Y groove shape input from the input unit 21 in Step 1 with reference to a database or the like stored in the hard disk 24, such as a route surface processing condition, for example, The angle of the plasma torch 2, the working gas flow rate, the current value, the secondary gas flow rate, the processing speed, the torch height, the cutting width correction amount, etc. are set (S2).
[Step 3]
Next, the calculation unit 22 outputs the route surface machining conditions set in step 2 to the driver 26 and the like, and the angle, working gas flow rate, current value, secondary gas flow rate, machining speed, torch height of the plasma torch 2. Etc., and the plasma torch 2 is moved according to the processing locus of the route surface to form a route surface on the right side in the direction of travel of the plasma torch 2 (S3).

  By executing Step 3, the plasma torch 2 forms a route surface R on the workpiece W as shown in FIG. FIG. 5A is a view of the plasma gas P viewed from the proximal end to the distal end in the direction of the axis O1 of the plasma torch 2, and FIG. 5B is from the rear of the plasma torch 2 to the front in the traveling direction. Shown is a view.

As shown in FIG. 5A, the plasma torch 2 moves in the direction indicated by the arrow V1. The plasma gas P injected from the plasma torch 2 forms a swirl flow in the direction of arrow V11 (right swirl), and a swirl flow of assist gas is formed around the plasma gas P. .
Thus, when the swirling flow of the plasma gas P and the assist gas is the right swirl V11 when viewed from the plasma torch 2, the route plane R is on the right surface of the machining groove on the right side in the traveling direction V1 of the plasma torch 2. It is formed.

[Step 4]
Next, the calculation unit 22 refers to a database or the like stored in the hard disk 24 for data for processing the Y groove shape portion input from the input unit 21 in step 1, for example, a groove surface processing condition, for example, The angle of the plasma torch 2, the working gas flow rate, the current value, the secondary gas flow rate, the processing speed, the torch height, the cutting width correction amount, etc. are set (S4).
[Step 5]
Next, the calculation unit 22 outputs the groove surface machining conditions set in step 4 to the driver 26 and the like, and the angle, working gas flow rate, current value, secondary gas flow rate, machining speed, torch height of the plasma torch 2. The height of the plasma torch 2 is adjusted, and the plasma torch 2 moves in accordance with the machining trajectory when forming the groove surface opposite to the moving direction of the plasma torch 2 when forming the root surface. A groove surface is formed in (5).

  By performing Step 5, the plasma torch 2 forms the groove surface K on the workpiece W as shown in FIG. 6A is a view of the plasma gas P as viewed from the base end toward the tip end in the direction of the axis O1 of the plasma torch 2, and FIG. 6B is the view from the front in the traveling direction of the plasma torch 2 to the rear in the traveling direction. The figure which looked toward is shown.

As shown in FIG. 6A, the plasma torch 2 moves in the direction indicated by the arrow V2. The swirl flow of the plasma gas P and the assist gas injected from the plasma torch 2 is in the direction of arrow V11 (right swirl).
As described above, when the swirling flow of the plasma gas P and the assist gas is the right swirl V11 when viewed from the plasma torch 2, the groove surface K may be formed on the left surface in the traveling direction V2 of the plasma torch 2. it can.

Hereinafter, with reference to FIG. 7, the formation of the Y groove shape portion according to the embodiment will be described.
First, as shown in FIG. 7A, for example, a plasma gas P having a clockwise swirl around it is injected from the plasma torch 2, and the plasma torch 2 is moved in the direction indicated by the arrow V1. A route surface R is formed on the workpiece W. At this time, since the swirling flow of the plasma gas P is a right swirling as indicated by V11, the route plane R can be formed on the right surface of the moving direction V1 of the plasma torch 2.

Next, as shown in FIG. 7B, when the plasma torch 2 is tilted in accordance with the groove angle θ corresponding to the groove surface K, and the plasma torch 2 is formed with the route plane R along the movement trajectory. The groove face K is formed by moving in the direction of the arrow V <b> 2, which is opposite to the direction of the groove.
By performing FIGS. 7A and 7B, a Y groove shape portion as shown in FIG. 7C can be formed.

  According to the groove processing program, the control system 20, and the plasma cutting device 1 according to the embodiment, when the Y groove shape portion is formed by plasma processing, the swirl flow direction V11 and the plasma torch 2 of the plasma gas P are formed. By forming the groove surface K on the surface on the side where the moving direction V1 is the same direction, it is possible to prevent the corner portions of the groove surface K and the root surface R from melting and rounding. . Furthermore, it can suppress that the molten metal produced when forming a groove surface adheres to a root surface.

  In addition, the plasma torch when cutting the groove surface K by forming the groove surface K on the surface on the side where the swirl flow direction V11 of the plasma gas P and the moving direction V1 of the plasma torch 2 are the same direction. The need to greatly reduce the moving speed of 2 is reduced, and the groove surface K can be formed efficiently.

  Further, after forming the route surface R, the groove surface K can be processed using the movement when returning to the starting side when forming the route surface R without exchanging the plasma torch 2. Compared to the case where the plasma torch 2 is once returned to the starting side for forming the root surface R when forming the groove surface K, there is no unnecessary movement, and the Y groove shape portion is efficiently formed in a short time. be able to.

Note that the present invention is not limited to the above-described embodiment, and various modifications can be made without departing from the spirit of the invention.
For example, in the above-described embodiment, the case where the swirling flow swirls rightward has been described, but it goes without saying that the plasma torch 2 that forms a left swirling flow may be used.

  In the above embodiment, the case where the groove surface K is processed using the movement when returning to the starting point side when the route surface R is formed without exchanging the plasma torch 2 has been described. The plasma torch 2 is returned to the starting point when the route surface R is formed, and is exchanged with the plasma torch 2 that generates a swirling flow in the opposite direction to that when the route surface R is formed in the plasma gas. It is good also as a structure which processes the groove face K, moving the plasma torch 2 in the same direction as it formed.

(Example)
Next, examples according to the present invention will be described.
FIG. 8 is a photograph according to an example for confirming the effect of the present invention, FIG. 8A is a photograph for explaining an example of the present invention, and FIG. 8B is a photograph for explaining a comparative example. 8A and 8B, the left side is a side view of the groove shape portion, and the right side is a front view of the groove shape portion.
According to the present invention, when the groove surface is formed, the corners are not rounded. In addition, as shown in FIG. 8 (B), the molten metal has been continuously adhered to the route surface, as shown in FIG. 8 (A). It was confirmed that it improved significantly.

The groove shape and groove shape machining conditions in the examples and comparative examples are as follows.
Plate thickness of workpiece W: 16 mm, root surface height: 7 mm, groove angle θ: 50 °, equivalent plate thickness when forming groove surface: 11.7 mm
[Route surface formation conditions]
Inclination angle of plasma torch: 90 °, working gas flow rate: 40 L / min, current value: 165 A, secondary gas flow rate: 30 L / min, processing speed 1700 mm / min, torch height: 4 mm
[Groove surface forming conditions]
Inclination angle of plasma torch: 50 °, working gas flow rate: 40 L / min, current value: 165 A, secondary gas flow rate: 30 L / min, machining speed 2000 mm / min (opposite direction when machining root surface), torch height: 4mm
In the comparative example, the groove surface was formed at a processing speed of 2000 mm / min (the same direction as when processing the root surface).

  According to the groove processing method, the groove processing program, the control system, and the plasma cutting device according to the present invention, when the Y groove shape portion is formed by the plasma gas in which the swirl flow is formed, it is melted and rounded. Since it is possible to efficiently form the Y-groove shape portion while suppressing sticking, it is industrially applicable.

O1 Torch axis P Plasma gas W Work material 1 Plasma cutting device 2 Plasma torch 15 Tilt mechanism (torch attitude control means)
16 Movement mechanism (torch position control means)
20 Control system

Claims (6)

A groove processing method for forming a Y groove shape portion on a workpiece while injecting and moving a plasma gas in which a swirl flow is formed from a plasma torch,
The plasma torch is moved while injecting plasma gas, and the swirl flow is on the right in the traveling direction when viewed from the plasma torch, and the traveling direction on the left when viewed from the plasma torch. Form a route plane on the left side,
Said by tilting the plasma torch relative to the workpiece to move while spraying the plasma gas, leftward in the traveling direction in the case of the right turn swirling flow of the plasma gas is seen from the plasma torch, wherein the plasma In the case of turning left as viewed from the torch , a groove processing method is characterized in that a groove surface is formed on the right side in the traveling direction. The groove processing method according to claim 1,
After forming the route plane,
When the groove surface is formed by inclining the plasma torch and moving while jetting plasma gas,
A groove processing method, wherein the plasma torch having the route surface is moved in a direction opposite to that when the route surface is formed. A surface plate for placing the workpiece,
A plasma torch for injecting a plasma gas in which a swirl flow is formed; and
Torch attitude control means for inclining the plasma torch according to the input groove angle;
A torch position control means for moving the plasma torch according to the inputted cutting scheduled site;
A groove processing program for forming a Y groove shape portion by a plasma cutting apparatus comprising:
When the plasma torch moves while jetting plasma gas, the swirl flow of the plasma gas turns to the right when viewed from the plasma torch, and to the right when viewed from the plasma torch. Forms a route plane on the left side in the direction of travel,
Said by tilting the plasma torch relative to the workpiece to move while spraying the plasma gas, leftward in the traveling direction in the case of the right turn swirling flow of the plasma gas is seen from the plasma torch, wherein the plasma A groove machining program configured to form a groove surface on the right side in the traveling direction in the case of a left turn as viewed from the torch . A groove processing program according to claim 3,
After forming the route plane,
When the groove surface is formed by inclining the plasma torch and moving while jetting plasma gas,
A groove processing program, wherein a groove surface is formed by moving a plasma torch having the root surface in a direction opposite to that when the root surface is formed.   A control system comprising the groove machining program according to claim 3.   A plasma cutting apparatus comprising the control system according to claim 5.