JP3456677B2 - Processing method using multiple torches - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a plurality of torches capable of processing a workpiece by preventing a torch mounted on a bar from colliding with an obstacle. The present invention relates to a processing method using the method. 2. Description of the Related Art A cutting torch such as a gas cutting torch or a plasma cutting torch is mounted on an NC cutting device controlled by a numerical control (NC) device to form a desired shape from a workpiece such as a steel plate or a stainless steel plate. The processing method which cuts out the product with the is adopted. The NC cutting apparatus generally has a frame running on rails laid in parallel, a carriage mounted on the frame and traversing in a direction perpendicular to the rail laying direction, and a cutting torch attached to the carriage. Then, by operating the cutting torch while controlling the running of the frame and the traverse of the carriage by the NC device, the target shape is cut from the workpiece. In an NC cutting apparatus, one carriage is mounted on a frame, and a bar having a predetermined length and arranged in a direction perpendicular to a rail is mounted on the carriage, and a plurality of bars are mounted on the bar. There is a configuration in which a cutting torch is movably mounted along each bar. This NC cutting device can move a plurality of cutting torches attached to a bar at the same time by controlling the driving of a motor that moves the frame along the rail and a motor that moves the carriage along the frame. This is advantageous when cutting a large number of products of the same shape from the workpiece. In the NC cutting device configured as described above,
When cutting a workpiece, a cutting torch to be operated is selected from a plurality of cutting torches attached to a bar according to a product shape to be cut. That is, not all the cutting torches are used when cutting the workpiece. The allowable traversing range of the carriage is determined in advance at the design stage. Therefore, it is impossible to cut a product having a length in the direction (x direction) perpendicular to the rail beyond the allowable traversing range of the carriage. The position of the carriage at the start of cutting is set by the length in the x direction of the product shape and the cutting start position, and the traversing range of the carriage is equal to the traversing range of the bar. [0006] In an NC cutting apparatus in which a bar having a plurality of torches attached to one carriage mounted on a frame is mounted, an NC cutting device may cut the bar during cutting of a workpiece depending on the cutting shape. The ends may protrude outside the rail or frame. A crater or nozzle is attached to the tip of the cutting torch attached to the bar, and the tip of the crater is lower than the bar. For this reason, when the end of the bar protrudes outside the rail and the frame, and there is a cutting torch not selected for cutting at the end of the bar, the cutting torch is disengaged from a part of the rail or the frame (saddle). There is a problem that there is a risk of colliding with an obstacle. In particular, the range in which the bar can traverse the frame and the range in which the torch can move with respect to the bar are set independently of each other. There is a problem that the collision of the torch with the obstacle cannot be avoided merely by setting the position of the bar in the frame corresponding to the desired shape. An object of the present invention is to provide a processing method using a plurality of torches that does not cause the torch to collide with an obstacle such as a rail or a frame even when processing a product of any shape from a workpiece. Is to do. [0009] In order to solve the above problems, a working method according to the present invention is to provide a frame running on a rail with a bar which traverses in a direction perpendicular to a rail laying direction and a bar. A plurality of torches are movably attached to the bar, and a torch selected from the torches is arranged at a predetermined position to process a workpiece, wherein one side of the frame is a reference side and The other side is set as the compliant side, and the length of the bar that can protrude from the rail is limited, and the limit position on the reference side and the compliant side of the bar protrusion limit, the processing shape and the processing start position for the workpiece are set. In addition to setting the range in which the bar can be positioned relative to the frame, when the bar moves in the reference direction and the compliant direction in accordance with the machining shape, the position of the bar and the position of the obstacle are determined. The provisional position of the bar is set such that the distance between the reference side limit and the obedience side limit of the movable area of the torch set in advance is equal, and the provisional position of the bar is within the positionable range of the bar. When the provisional position of the bar is set as the reference position of the bar, and when the provisional position of the bar is not in the positionable range of the bar, the provisional position of the bar is corrected to the position in the closest positionable range of the bar. It is set as a reference position and determines a range in which the torch can be arranged on the bar without colliding with an obstacle, and then selects a torch and performs processing on a workpiece. is there. In the above-mentioned working method, one side of the frame is set as a reference side and the other side is set as a compliant side, and a length of a bar to which a plurality of torches are attached can be protruded from a rail. The position where the bar can be positioned relative to the frame is set according to the reference limit position and the limit position on the obedient side of the projection limit, and the processing shape and the processing start position for the workpiece. When moving in the direction and the obedient side, the distance between the moving position and the reference side limit and the obedient side limit of the movable area of the torch set by the bar projection limit and the movable range of the torch relative to the bar is set. The provisional position of the bar is set to be equal, and when the provisional position of the bar is within the positionable range of the bar, the provisional position of the bar is set as the reference position of the bar. In addition, by selecting the torch, all torches attached to the bar do not collide with obstacles when cutting the target product. An embodiment of the above-mentioned processing method will be described below with reference to the drawings. FIG. 1 is a schematic perspective view illustrating the configuration of an NC cutting device having a bar, and FIG. 2 is a diagram illustrating a processing method according to the present embodiment. Examples of dimensions set in the NC cutting device and shapes to be cut are shown. FIGS. 3A and 3B are diagrams illustrating a processing method according to the present embodiment, and FIGS. 4A and 4B are diagrams illustrating a method of setting a positionable range of a bar, and FIGS. It is a figure explaining the method of setting the movable range of a torch. According to the present invention, when a bar is fixedly attached to a carriage mounted on a frame, a plurality of torches are attached to the bar, and these torches are selected to perform cutting, marking, and the like on a workpiece. The present invention relates to a processing method for preventing a non-selected torch from colliding with a saddle constituting a rail or a frame. Therefore, as a torch, a gas cutting torch, a plasma cutting torch, a marking torch, and the like according to a target operation can be used. In this embodiment, a cutting apparatus using a gas cutting torch will be described as a representative. First, the schematic configuration of the NC cutting apparatus will be described with reference to FIG. A pair of rails 1 are laid in parallel along the y direction, and a frame 2 is mounted on the rails 1 so as to run. The frame 2 includes a cross garter 2a disposed in a direction (x direction) orthogonal to the rail 1, a control panel including a traveling motor and an NC device (not shown), an operation panel provided with operation switches and a display, and the like. It has a saddle 2b mounted. The frame 2 travels on the rail 1 with rotation of a travel motor controlled by the NC device. A traversing rail 3 is attached to the cross garter 2a along the x direction, and a carriage 4 provided with a traversing motor 4a is mounted on the traversing rail 3 so as to be able to traverse. The carriage 4 traverses on the traverse rail 3 with the rotation of the traverse motor 4a controlled by the NC device. A bar 5 having a predetermined length and arranged in parallel with the traversing rail 3 is fixed to the carriage 4 via a bracket 5a. The bar 5 is connected to the cross garter 2a and the cutting plate 9 by a bracket 5a.
Are arranged at positions that can be separated from the predetermined distance. A plurality of torches 6 are attached to the bar 5 so as to be movable and fixed along the bar 5. In this embodiment, five torches 61 to 65 are attached. Each of the torches 6 is configured as a gas cutting torch, and a crater 6 a is detachably attached to the tip of the torch 6. Each of the torches 6 is mounted on a holder 7. The holder 7 has an elevating motor 7a for elevating and lowering the torch 6, and the holder 7 is controlled by an NC device to move the holder 7 along a bar 5 to a commanded position. An unillustrated moving motor and a fixing mechanism for fixing the holder 7 to the bar 5 when the holder 7 moves to a predetermined position (for example, an electric fixing mechanism by a servo mechanism or a mechanical clamping device) are provided. Between the rails 1, there is provided a cutting table 9 on which a steel sheet 8 to be processed is placed. The relationship between the top level of the cutting platen 9 and the top level of the rail 1 is set at the design stage of the NC cutting apparatus. However, considering the weight reduction of the frame 2 and running stability, the top level of the rail 1 is considered. It is generally higher than the top level of the cutting platen 9. The NC cutting device constructed as described above is the same as that conventionally provided on the market. In this NC cutting device, when a torch 6 (for example, torch 63) arranged at the center is selected when cutting a product having a relatively large shape from the steel plate 8, the selected torch 63 is applied to the steel plate 8.
When the end of the bar 5 is moved closer to the rail 1 or the saddle 2b, the torches 61, 62,
There is a problem that the wheels 64 and 65 collide with the rail 1 or the saddle 2b. Further, depending on the designed machine, the saddle 2b is higher than the bar 5, and there may be a problem that the end of the bar 5 collides with the saddle 2b. And this invention solves the said problem. Next, a processing method according to the present embodiment will be described with reference to FIGS. In FIG. 2A, the NC cutting device is set such that the saddle 2b side of the frame 2 is a reference side and the opposite side is a compliant side. N is the distance between rails 1, L
Is the length of the bar 5, and M is a region where the torch 6 in the bar 5 can be arranged, and is a range where the torch can be arranged with respect to the bar. The symbol m denotes a region where the torch cannot be arranged, which is set at both ends of the bar 5, and a stopper and a sensor (not shown) for preventing the torch 6 from dropping from the bar 5 are provided in this region. O represents the length that the end of the bar 5 can protrude from the rail 1 on the reference side, and the line 11 represents the limit position on the reference side of the projection limit. P represents the length that the end of the bar 5 can protrude from the compliant rail 1, and the line 12 represents the compliant side limit position of the protrusion limit. These protrusion limits are set in accordance with the size of the factory where the NC cutting device is installed, the environment such as surrounding structures, and the like, and regardless of whether the torch 6 collides with the saddle 2b or the rail 1, the bar 5 Is determined depending on whether the end of the vehicle collides with a structure existing around the traveling range of the saddle 2b or the frame 2 and whether a required working space can be secured along the rail 1. That is, the restriction on the protrusion of the bar 5 does not guarantee that collision of the torch 6 against an obstacle is avoided. K is the torch 6
Is set as appropriate according to the existence of the rail 1, the saddle 2b or other obstacles. The length and range in which the bar 5 can traverse in the x-direction and the allowable traversing range S of the carriage 4 corresponding to the traversing range of the bar 5 are set by setting the projection limits for the reference side and the obedient side. The permissible traversing range S is a range in which the carriage 4 can traverse the cross garter 2a, but is simply referred to as a permissible traversing range of the bar 5 in order to avoid complicated description. FIG. 2B shows an example of a figure H to be cut. T is a piercing point for forming a hole on the scrap side of the steel sheet when cutting is started, and this point is a processing start position. A is the distance from the processing start position T to the most reference point in the graphic H, and b is the distance from the processing start position T to the most compliant point in the graphic H. Next, a positionable range of the bar 5 which is a range in which the bar 5 can be initially positioned when cutting the figure H is set. This operation is performed, as shown in FIG. 3, by the torches 61,
It is performed assuming that 65 is arranged. First, as shown in FIG.
When 1, 65 reaches the most reference point and the most obedient point of the figure H, the end of the bar 5 exceeds the reference limit position 11 and the observable limit position 12 of the protrusion limit. Set a position without a mark. The position is set by a and b in FIG. That is, a position c that is moved a to the obedient side from the reference side end of the allowable traversing range S of the bar 5 and a position d that is moved b to the reference side from the obedient end of the allowable traversing range S are set. When the bar 5 traverses between the distances d and d, both ends of the bar 5 do not exceed the limit positions 11 and 12 of the protrusion limit. Next, as shown in FIG. 2B, the position of the steel plate 8 is set, and the position of the figure H with respect to the steel plate 8 is set. It is positioned at the cutting start point T of H. At this time, if the position of the bar 5 is on the obedient side of the position c, this position is set as Q. When the position of the bar 5 is on the reference side of the position c and is within the range a, the position c is adopted. Next, as shown in FIG.
Is positioned at the cutting start point T of the graphic H arranged on the reference side of the steel plate 8, and the position R is set in the same manner as the above-described operation.
Alternatively, the position d is adopted. The range defined by the positions Q and R or the positions c and d set as described above is set as the positionable range of the bar 5. Note that the set positions Q, R
Alternatively, in the positions c and d, the position Q or the position c is the position R
Alternatively, when the position is on the obedient side of the position d, the positionable range of the bar 5 does not exist, and the cutting of the figure H becomes impossible. Next, the provisional position of the bar 5 is set by an operation different from the setting of the positionable range of the bar 5 described above. As shown in FIG. 4, when the carriage 4 reaches a position corresponding to the most reference point of the graphic H, the reference end of the bar 5 and the movable area K of the torch 6 are moved. The distance E from the limit on the reference side and the carriage 4
Bar 5 when the position corresponding to the most obedient point of
The position of the carriage 4 where E = F is set by assuming a distance F between the end on the obedient side of the torch 6 and the limit on the obedient side of the movable area K of the torch 6. And a carriage 4 that satisfies E = F
Is set as the provisional position of the bar 5. The bar 5 set by the provisional position and the positions Q and R or the positions c and d
If the position is within the range, the provisional position is set as the reference position of the bar 5 and the torches 6 corresponding to the number of figures H to be cut at the same time from the steel plate 8 are selected. When the provisional position of the bar 5 is not within the positionable range, the position within the positionable range closest to the provisional position is set as the reference position of the bar 5, and the graphic H is converted from the reference position. When the range M where the torch 6 can be arranged on the bar 5 exceeds the movable area K of the torch 6 when cutting, the range M that does not exceed the movable area K is set as the area where the torch 6 can be arranged. Then, the torches 6 corresponding to the number of figures H to be cut at the same time are selected from the steel plate 8. When the required number of torches 6 are selected as described above, no collision occurs between the saddle 2a and the rail 1 during cutting, regardless of the position of the unselected torches 6 on the bar 5. As described above in detail, in the working method according to the present invention, by limiting the bar from protruding from the frame or the rail, a work space or a material storage space in parallel with the laid rail is provided. Space can be clearly defined. For this reason, even if the bar protrudes from the frame or the rail during processing, the bar does not collide with an obstacle, and safe and smooth processing can be performed. Further, the initial position of the bar where the torch does not collide with the obstacle is set according to the shape of the product to be processed and the processing start position, and the torch is selected based on the set position of the bar. Therefore, during processing, the torch does not collide with a part of the frame or an obstacle such as a rail. For this reason, it has features such as smooth processing.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a schematic perspective view illustrating a configuration of an NC cutting device having a bar. FIG. 2 is a diagram for explaining a processing method according to the embodiment;
It is a figure explaining the example of the size set to the C cutting device, and the shape to cut. FIG. 3 is a diagram for explaining a processing method according to the embodiment, and is a diagram for explaining a method for setting a positionable range of a bar. FIG. 4 is a diagram illustrating a processing method according to the present embodiment, and is a diagram illustrating a method of setting a movable range of a torch. [Description of Signs] 1 rail 2 frame 2a cross garter 2b saddle 3 traversing rail 4 carriage 4a traversing motor 5 bar 5a bracket 6, 61-65 torch 6a crater 7 holder 7a elevating motor 8 steel plate 9 cutting platen 11 standard of protrusion restriction Limit position on the side 12 Limit position on the obedient side of the protrusion limit N Spacing L between the rails L Length M Bar torch disposable range m Bar Torch non-displaceable region O Bar can be protruded on the reference side Length P Length at which the bar can protrude on the obedient side S Allowable traversing range K of the carriage (bar) K Moveable area H of the torch Figure to be cut T Processing start position a Point on the most reference side of the figure from the processing start position Distance b from the processing start position to the most compliant point of the figure Q, R Bar position E when the torch is positioned at the cutting start point, F End of the bar Distance between the torch and the movable area limit

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁷ , DB name) B23K 10/00 B23K 7/00

Claims (1)

(57) [Claim 1] A frame running on a rail is provided with a bar traversing in a direction perpendicular to the rail laying direction, and a plurality of torches are movably mounted on the bar. A processing method for processing a workpiece by arranging a torch selected from torches at a predetermined position, wherein one side of a frame is set as a reference side and the other side is set as a compliant side, and a bar rail is used. Providing a limit on the length that can be protruded, and setting a positionable range of the bar with respect to the frame by the limit position on the reference side and the limit position on the obedient side of the bar protrusion limit and the processing shape and processing start position for the workpiece, When the bar moves in the reference side direction and the obedient side direction corresponding to the processing shape, this movement position and the reference side limit and the movable range of the torch movable area set according to the position of the obstacle are set. Setting the provisional position of the bar such that the distance to the side limit is equal, setting the provisional position of the bar as a reference position of the bar when the provisional position of the bar is within the positionable range of the bar, and When the tentative position of the bar is not within the positionable range of the bar, the tentative position of the bar is corrected to the position within the positionable range of the nearest bar and set as a reference position, and the bar is not impacted with an obstacle. A processing method using a plurality of torches, characterized in that a torch arrangement possible range is determined in step (1), and thereafter, a torch is selected and processing is performed on a workpiece.