JP4903006B2 - A groove cutting method using an NC laser cutting machine and an operation program for a CAM system used to implement the method - Google Patents

Description

  The present invention relates to a groove cutting method suitable for use in cutting a plate material while performing groove processing with an NC (numerical control) laser cutting machine in order to cut out a member having a groove such as a shipbuilding member, and the like. The present invention relates to an operation program for a CAM (Computer Aided Machining) system for creating an NC program used for carrying out the method.

  As shown in FIG. 9 (a), the ship-building member often has an end E having a rounded contour corresponding to the hull shape and having a groove for welding. A rounded outline is usually formed by a connection of many fine linear elements having a length of several millimeters to several tens of millimeters in which the bending angle between adjacent linear elements is 1 degree or less, as shown in FIG. Thus, the angle of the groove G of the end E for each of these fine linear elements (inclination angle of the end face of the member with respect to the direction perpendicular to the member surface in the plane perpendicular to the contour line at the target position) Has changed in units of several degrees, and as a result, the edge angle of the end E of the shipbuilding member gradually changes along the rounded contour.

  On the other hand, in the conventional NC laser cutting machine, the laser head tilt angle (laser with respect to the direction perpendicular to the plane of the plate to be cut in the plane perpendicular to the traveling direction of the laser head) while the laser head is moving. The tilt angle in the irradiation direction is fixed. Therefore, conventionally, in order to perform laser cutting by gradually changing the groove angle along the contour of the end portion of the member at the time of cutting out the member as described above, among the many fine linear elements described above, The cutting is temporarily stopped at the end position of the linear element immediately before the linear element whose tip angle is changed, and the cutting of the next linear element is started after slightly changing the tilt angle of the laser head. ing.

  However, since piercing (laser drilling) is required again to start cutting, in the above-described conventional method, if the angle change position is increased, the machining accuracy increases, but the NC program of the computer constituting the CAM system. The creation time of the NC program for the NC laser cutting machine including the position data of the laser head by the creation function and the time for the cutting process become enormous. On the other hand, if the angle change position is reduced, the time for creating the NC program for the NC laser cutting machine and the time for cutting are shortened, but there is a problem that the machining accuracy is lowered. Further, since the portion where the cutting is completed and the next cutting start portion are separated by gas cutting or the like, it is necessary to finish the portion with a grinder or the like.

  In recent years, a new NC laser cutting machine has been developed that can change the tilt angle of the laser head even while the laser head is moving. In this NC laser cutting machine, only according to the moving distance during linear movement. The tilt angle of the laser head can be changed by an angle. In other words, a linear movement of a distance corresponding to the desired tilt angle change is required.

  Therefore, according to the present invention, by changing the contour line as appropriate within the range of the machining tolerance, the new NC laser cutting machine has the rounded contour and the end portion having the groove for welding. The object of the present invention is to advantageously solve the above-described problems and shorten the time for creating an NC program for an NC laser cutting machine and the actual cutting and finishing time.

  The groove cutting method by the NC laser cutting machine of the present invention that achieves the above object is that the NC laser cutting machine performs groove processing while gradually changing the groove angle along a predetermined contour line, along the contour line. When the cutting process is performed, from an arbitrarily defined location on the contour line, if the location is located on a break point, the angle between the two graphic elements constituting the contour line on two sides of the location is set to two. In the direction to equally divide, if the part is located on a straight line, in the direction normal to the straight line or in the direction to bisect the angle between the two graphic elements constituting the contour line following both ends of the straight line , A first straight line having a length substantially equal to the machining tolerance of the cutting process is drawn, a second straight line passing through the end point of the first straight line and orthogonal to the first straight line is drawn, and the second straight line is drawn. And two lines that form the contour line on both sides of the part In the design of the groove angle between the two intersection points, the two intersection points with the graphic element group are determined as the groove angle changing straight line between the two intersection points of the second straight line. It is determined whether the groove angle changing straight line has a length equal to or longer than a predetermined length required for the NC laser cutting machine to change the tilt angle of the laser head by a change amount, and the groove angle changing straight line is determined. , The groove angle changing straight line is used as a graphic element instead of the graphic element constituting the contour line between the two intersecting points, and the groove angle changing straight line is changed. The laser head is moved along the straight line, and the tilt angle of the laser head is changed by the amount of change in the groove angle.

  Further, the operation program for the CAM system of the present invention used for carrying out the above method is that the NC laser cutting machine performs groove processing while gradually changing the groove angle along a predetermined contour line, along the contour line. In the operation program for the CAM system to create the NC program for performing the cutting process, when the location is located on the break point from the location arbitrarily determined on the contour line, The direction in which the angle between the two graphic elements constituting the contour line is divided into two equal parts, and if the location is on a straight line, the contour line is constructed following the normal direction of the straight line or both ends of the straight line Drawing a first straight line having a length equal to the machining tolerance of the cutting process in a direction that bisects the angle between the two graphic elements; and passing through the end point of the first straight line Straight and straight A step of drawing a second straight line that intersects, two intersection points of the second straight line and two graphic element groups that constitute the contour line on both sides of the portion are obtained, respectively. The step of making the portion between the two intersections into a straight line for changing the groove angle, and the NC laser cutting machine changes the tilt angle of the laser head by the design change amount of the groove angle between the two intersections. Determining whether the groove angle changing straight line has a length greater than or equal to a predetermined length required for the opening angle, and when the groove angle changing straight line has the predetermined length, The tip angle changing straight line is used as a graphic element instead of the graphic element constituting the contour line between the two intersections, and the laser head is moved along the groove angle changing straight line while moving the laser head. The inclination angle is changed by the change amount of the groove angle. Comprising the steps of a so that the is characterized in that those steps are all are intended to be executed by a computer constituting the CAM system.

  According to the groove cutting method by the NC laser cutting machine of the present invention and the operation program for the CAM system for carrying out the groove cutting straight line, the groove angle changing straight line created by the above procedure is the most from the groove angle changing straight line. Since the position that is separated is the above arbitrarily determined location, it is separated from the original contour by a machining tolerance at the maximum, so the cutting process along the straight line for changing the groove angle is the original contour. The line is within the processing tolerance range. The cutting process along the straight line for changing the groove angle is performed by the NC laser cutting machine by the amount of design change of the groove angle between the two intersections of the contour line and the second straight line. NC laser cutting machine reliably changes the tilt angle of the laser head by the design change of the groove angle between the two intersections. can do.

  Therefore, according to the groove cutting method by the NC laser cutting machine of the present invention and the operation program for the CAM system for implementing the method, the groove angle is gradually changed along the predetermined contour line by the NC laser cutting machine. When performing cutting along the contour line while performing groove processing, it is possible to greatly change the tilt angle of the laser head by greatly reducing the end and start of cutting, so that the NC laser The creation time of the NC program for the cutting machine and the actual cutting and finishing time can be greatly shortened.

  In the groove cutting method by the NC laser cutting machine of the present invention and the operation program for the CAM system for carrying out the same, the two graphic element groups have the same groove angle in the same graphic element group. It may consist of a plurality of graphic elements constituting the contour line, and in this way, the groove angle at the two intersections is known in advance, so the design change of the groove angle Since the predetermined length required for the NC laser cutting machine to change the tilt angle of the laser head is easily determined by the amount, it is also easy to determine whether or not the groove angle changing straight line has a length longer than the predetermined length. It can be done easily in time, and the time for creating an NC program for an NC laser cutting machine can be further reduced.

  Further, in the groove cutting method by the NC laser cutting machine of the present invention and the operation program for the CAM system for carrying out the same, when the location is located on the curve, in the normal direction of the curve at the location, A first straight line having a length equal to the processing tolerance of the cutting process may be drawn, and in this way, even when the line element constituting the contour line includes a curve, the same effect as the previous case Can bring.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. FIG. 1 is a block diagram schematically showing a CAM system for carrying out an embodiment of a groove cutting method using an NC laser cutting machine according to the present invention, and FIG. 2 is a diagram showing the implementation of the method of the embodiment. 1 is a flowchart showing an example of an operation program for a CAM system for the NC laser cutting machine 2 connected to the NC laser cutting machine 2 and the NC laser cutting machine 2. An NC program creation computer 3 is provided.

Here, the NC laser cutting machine 2 includes, for example, a laser generator 2a that generates a laser beam of a CO ₂ laser, a laser head 2b that irradiates and outputs a laser beam optically guided from the laser generator 2a, and A laser head moving mechanism 2c that two-dimensionally moves the laser head 2b to cut a plate material such as a steel plate into an arbitrary planar shape and changes the inclination angle of the laser head 2b during the cutting, a laser generator 2a, And an NC computer 2d for numerically controlling the operation of the laser head moving mechanism 2c.

  Further, the NC program creation computer 3 here is a normal one, and a main body 3a having a CPU (central processing unit), a display device 3b for screen display, a keyboard 3c for key input, and movement and click of a pointer. And a mouse 3d for instruction.

  In the method of this embodiment, for example, the NC program creation computer 3 creates an NC program for cutting a groove in a shipbuilding member as shown in FIGS. 9A and 9B in accordance with the procedure shown in FIG. To do. Here, as described above, the shipbuilding member has an end E having a rounded contour corresponding to the hull shape and a groove for welding, and the roundness is reduced. The outline is composed of a series of small linear elements having a length of several millimeters to several tens of millimeters with a bending angle between adjacent linear elements of 1 degree or less. At the same time, the angle of the groove G of the end E changes in units of several degrees, whereby the edge angle of the end E of the shipbuilding member gradually changes along the rounded contour.

  In the procedure shown in FIG. 2, the NC program creation computer 3 reads the CAD data of the shipbuilding member created in advance by a CAD (computer aided design) system (not shown), and the NC program creation computer 3 first executes step S1. Then, the point where the groove angle of the edge E indicated by the CAD data changes from α to β is selected by the operation of the mouse 3d by the operator of the CAM system, for example, and the selected point is set as P. . Here, the point P is located at a break point because the linear elements before and after it have an angle, and in the figure of the point P, the graphic element group A consisting of a plurality of straight lines on the left side is a groove angle. In the diagram of the point P, the graphic element group B consisting of a plurality of straight lines on the right side has a groove angle β.

  Next, in step S2, a straight line element C as a first straight line having a length of tolerance L1 from the point P in a direction that bisects the angle between the straight lines connected to the left and right in the figure of the point P is shown. The point P ′ created and moved by the tolerance L1 from the point P is defined, and in the subsequent step S3, a straight line L as a second straight line passing through the point P ′ and orthogonal to the linear element C is created.

  In the next step S4, an intersection PA between the straight line L and the graphic element group A is obtained, and an intersection PB between the straight line L and the graphic element group B is obtained, and in the subsequent step S5, the intersections PA and PB are connected. A straight line element D is created as a straight line for changing the groove angle.

  In the next step S6, the distance between the intersections PA and PB, that is, the length L2 of the linear element D is changed so that the NC laser cutting machine 2 changes the inclination angle of the laser head 2b to change the groove angle from α to β. It is determined whether or not the amount of linear movement of the laser head 2b required for this is equal to or greater than the prescribed amount.

  Note that the minimum amount of linear movement of the laser head 2b required to change the groove angle from α to β is determined by the specifications of the NC laser cutting machine 2, but depending on the cutting conditions, cutting is not possible with the minimum amount. Therefore, the specified amount is determined to be equal to or greater than the minimum value in accordance with the cutting conditions, and is given to the NC program creating computer 3 by the operator in advance.

  If it is determined in step S6 that the length L2 of the straight line element D is equal to or greater than the specified amount, in the next step S7, the straight line element group A, the straight line element D, and the crossing point PB on the left side of the figure from the intersection PA In the figure, the shape connecting the right straight element group B is changed to the contour shape of the end E of the shipbuilding part, and the groove angle is changed from α to β in the straight element D in the last step S8. Element.

  In this way, the NC program creation computer 3 changes the contour line of the end E of the CAD data of the shipbuilding part and changes the tilt angle of the laser head 2b while moving the laser head 2b along the contour line. The NC program created as described above is transferred to the NC computer 2d of the NC laser cutting machine 2. In the method of the above embodiment, the NC computer 2d operates the laser generator 2a and the laser head moving mechanism 2c according to the NC program. The above ship building parts are cut out from the plate material by numerical control.

  Therefore, according to the groove cutting method by the NC laser cutting machine of this embodiment and the operation program for the CAM system for the execution, the straight line element D created by the above procedure is the straight line element D of the original contour line. Since the position farthest from the point is the above-mentioned arbitrarily determined position, it is separated from the original contour line by a machining tolerance at the maximum, and therefore, the cutting process along the straight line element D is performed in the original contour line. To within the processing tolerances. The cutting along the straight line element D is performed by the NC laser cutting machine 2 by the amount of design change (α−β) of the groove angle between the two intersections PA and PB of the contour line and the straight line L. The NC laser cutting machine 2 sets the inclination angle of the laser head 2b to the groove angle between the two intersections PA and PB since the linear length L2 is equal to or longer than a predetermined length required for changing the inclination angle of the head. The amount of change (α−β) in design can be surely changed.

  Therefore, according to the groove cutting method by the NC laser cutting machine of this embodiment and the operation program for the CAM system for the execution, the groove angle is gradually increased along the predetermined contour line by the NC laser cutting machine 2. When performing cutting along the contour line while performing groove processing to change, the tilt angle of the laser head 2b can be gradually changed with little or no end and start of cutting. As a result, the NC program creation time for the NC laser cutting machine 2 and the actual cutting and finishing time can be greatly shortened.

  Moreover, according to the groove cutting method by the NC laser cutting machine of this embodiment and the operation program for the CAM system for the implementation, the two graphic element groups A and B are the same in the graphic element group A, respectively. Since the graphic element group B is composed of a plurality of graphic elements constituting the contour line of the same groove angle β in the graphic element group B, the two intersection points PA, Since the groove angle at PB is previously known as α and β, the predetermined length required for the NC laser cutting machine 2 to change the inclination angle of the laser head 2b by the amount of design change of the groove angle is easy. Therefore, it can be easily determined in a short time whether or not the linear element D has a length equal to or longer than the predetermined length, and the time for creating the NC program for the NC laser cutting machine 2 is further reduced. be able to.

  By the way, as shown on the left side of FIG. 4 (a), when there is no groove processing in the corner portion of the part cut out from the plate material, normally, as shown on the right side of FIG. Although the part is cut, as shown on the left side of FIG. 4B, when there is a groove in the corner part of the part cut out from the plate material, it is necessary to change the inclination angle of the laser head as described above. As shown on the right side of FIG. 4B, cut in order of paths P1, P2 and P3, once cut between the paths, escape from the part shape, start cutting again and cut to cut the next path is doing.

  However, in this case, when cutting the path P3 next to the path P2 with the groove processing shown on the left side of FIG. 5, there is a problem that the cut surface is disturbed at the start portion of the path P3, and the surface is damaged. The cause is presumed to be that the flow of assist gas sprayed on the surface of the plate material for blowing off the material melted by the laser beam changes on the groove surface, and the assist gas escapes.

  In order to avoid the above phenomenon, the cutting order of the front groove cutting may be last, but due to the influence of the heat of laser cutting, the parts being cut may move or deform, resulting in product accuracy. May get worse. Depending on the shape of the part, the cutting order of the front groove cutting may not be the last.

  Therefore, in the method of this embodiment, the NC program creation computer 3 further executes the procedure as shown in FIG. 6 when creating the NC program for groove cutting. That is, here, for example, if the operator of the CAM system inputs the remaining amount Lr, the reserve amount Lc, and the clearance angle φ as shown in FIGS. , Out of a plurality of graphic elements constituting the contour of the part to be cut out, whether the graphic element M preceding at the time of cutting is a graphic element that performs front groove processing or not, determines whether or not it is a corner portion for processing. If it is determined that the preceding element M is not a graphic element to be subjected to front groove processing, it is determined that it is not a corner portion for processing, and the processing relating to this corner portion is terminated.

  On the other hand, if the preceding graphic element M is a graphic element to be subjected to front groove processing in step S11, it is determined that it is a corner portion for processing, and in the next step S12, the graphic element M and the graphic that follows it are determined. An interior angle (sandwich angle) θ between the element N and the element N is obtained, and in a subsequent step S13, it is determined whether or not the interior angle θ is 90 ° (right angle) or more. If the inner angle θ is 90 ° or more, as shown in FIG. 7, the groove surface plate surface line N ′ is obtained from the groove shape and the plate thickness of the graphic element N in step S14, and then in step S15. , The pressing point Q which is the intersection of the graphic element M and the graphic element (plate surface line) N ′ is obtained, and the groove cutting is the distance from the pressing point Q to the graphic element N on the extension line of the graphic element M The geometrical length Lg of the affected part is obtained, and the position where the reserved amount Lc is returned on the graphic element M from the pressing point Q is released as the initial point, and the graphic element M is extended from the initial point. The escape amount Lo, which is the distance to the point where the line intersects the graphic element N, is obtained.

  Thereafter, in step S16, a relief shape Fo for the graphic element M as shown by a solid line in FIG. 7 is created from the reserve amount Lc and the remaining amount Lr from the holding point Q and the relief angle φ, and this processing is completed. To do. Here, the relief shape Fo stops midway and is not connected to the graphic elements N and N ′. As described above, in this embodiment, the process of the corner portion with the front groove cutting is to cut off the cutting path to the middle of the part from the front of the corner portion, and the remaining portion without being cut is When the parts are cleaned, they are cut by gas cutting and finished with a grinder. Since the shape of the relief portion varies depending on the thickness of the plate material such as a steel plate, the angle of the corner portion, and the groove angle, the reserve amount Lc, the remaining amount Lr, and the relief angle φ are as specified by the operator as described above. The length Lg of the affected part due to the groove cutting was automatically added.

  If the inner angle θ is less than 90 ° as a result of the determination in step S13, a groove cutting plate is obtained from the groove shape and the plate thickness of the graphic element M in step S17 as shown in FIG. The surface line M ′ is obtained, and in step S18, as in step S14, the groove surface plate surface line N ′ is obtained from the groove shape and thickness of the graphic element N, and in the next step S19, The pressing point Q, which is the intersection of the element (plate surface line) M ′ and the graphic element (plate surface line) N ′, is obtained, and in the next step S20, a perpendicular line is drawn from the pressing point Q to the preceding graphic element M, The intersection of the perpendicular and the graphic element M is set as a new pressing point Q ′ of the reserve amount Lc.

  Thereafter, the process returns to the previous step S16 to create a relief shape Fo for the graphic element M as shown by a solid line in FIG. 8 from the reserve amount Lc and the remaining amount Lr from the holding point Q and the relief angle φ. This process is terminated. As described above, when the inner angle θ is less than 90 °, a new pressing point Q ′ is obtained, and the position corresponding to the reserve amount Lc is released from that position as the first point, as in the case where the inner angle θ is 90 ° or more. If the position of the holding amount Lc from the pressing point Q, which is the intersection of the graphic element M and the graphic element (plate surface line) N ′, is the initial point, the cutting amount Lo is insufficient and the cutting surface is cut by groove cutting. This is because there is a possibility that the storm will remain.

  Therefore, according to the groove cutting method by the NC laser cutting machine of this embodiment and the operation program for the CAM system for the execution, when the path following the path with the groove processing is cut, the start portion of the path It is possible to effectively prevent the cut surface from being damaged.

  Although the present invention has been described based on the illustrated example, the present invention is not limited to the above-described example. For example, in the above-described embodiment, the groove angle of the contour line of the end E of the component is changed from α in step S1. Although the break point which is the point changing to β is selected as the point P, the point P may be selected on the linear element before or after the groove angle changes from α to β. In the direction normal to the straight line or in the direction that bisects the angle between the two graphic elements constituting the contour line following the both ends of the straight line, the length is substantially equal to the processing tolerance L1 of the cutting process. The linear element C may be drawn.

  If the contour line of the end E of the part includes a curved element, a point on the curve is selected as a point P in step S1, and cutting is performed in the normal direction of the curve at the point P. The linear element C having a length equal to the machining tolerance L1 of the machining may be drawn. In this way, even when the line element constituting the contour line includes a curve, the same effect as in the previous case is brought about. be able to.

  In the above embodiment, the operation program for the CAM system is for the NC program creation computer 3 constituting the CAM system 1, but the groove cutting method by the NC laser cutting machine of the present invention and the CAM for the implementation thereof. The system operation program may be applied to a CAD / CAM system and an NC program creation computer constituting the system.

  Thus, according to the groove cutting method by the NC laser cutting machine of the present invention and the operation program for the CAM system for the implementation, the groove angle is gradually changed along the predetermined contour line by the NC laser cutting machine. When performing cutting along the contour line while performing groove processing, NC laser cutting is possible because the end and start of cutting can be greatly reduced and the tilt angle of the laser head can be gradually changed. The NC program creation time and the actual cutting and finishing time can be significantly shortened.

It is a block diagram which shows typically the CAM system for implementation of one Example of the groove cutting method by NC laser cutting machine of this invention. It is a flowchart which shows one Example of the operating program for CAM systems for implementation of the method of the said Example. It is explanatory drawing which shows the method in which the action | operation program for CAM systems of the said Example produces the linear element D as a straight line for groove angle change. (A), (b) is explanatory drawing which shows the conventional groove cutting method by NC laser cutting machine. It is explanatory drawing which shows the problem of the said conventional groove | channel cutting method. It is a flowchart which shows the operation program for CAM systems of the said Example which solved the problem of the said conventional groove | channel cutting method. It is explanatory drawing which shows the method in which the operating program for CAM systems of the said Example produces relief shape Fo about the corner part whose interior angle is 90 degrees or more. It is explanatory drawing which shows the method in which the action | operation program for CAM systems of the said Example produces the relief shape Fo about the corner part whose inner angle is less than 90 degrees. (A) is a top view which illustrates the edge part outline of the component which carries out groove cutting by NC laser cutting machine, (b) is explanatory drawing which shows the groove | channel given to the outline.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 CAM system 2 NC laser cutting machine 2a Laser generator 2b Laser head 2c Laser head moving mechanism 2d NC computer 3 NC program creation computer 3a Main body 3b Display device 3c Keyboard 3d Mouse A, B Graphic element group C, D Linear element E End G Groove L Straight line L1 Tolerance L2 Length of linear element D Lc Reserve amount Lg Length of affected part by groove cutting Lo Escape amount Lr Remaining amount M, M ', N, N' Graphic element P, P ', PA, PB, Q, Q' Points P1-P3 Path α, β Groove angle θ Interior angle φ Clearance angle

Claims (4)

When the NC laser cutting machine performs the cutting process along the contour line while performing the groove processing while gradually changing the groove angle along the predetermined contour line,
When the position is located on a break point from a place arbitrarily determined on the contour line, the direction that bisects the angle between the two graphic elements constituting the contour line on both sides of the position, the position Is located on a straight line, the cutting tolerance of the cutting process in the normal direction of the straight line or in the direction that bisects the angle between the two graphic elements constituting the contour line following both ends of the straight line Draw a first straight line of length equal to
Draw a second straight line through the end point of the first straight line and orthogonal to the first straight line,
Two intersection points between the second straight line and two graphic element groups constituting the contour line on both sides of the portion are respectively obtained, and a portion of the second straight line between the two intersection points is grooved. A straight line for changing the angle
The groove angle changing straight line has a length longer than a predetermined length required for the NC laser cutting machine to change the tilt angle of the laser head by the design change amount of the groove angle between the two intersections. Determine whether
When the groove angle changing straight line has the predetermined length, the groove angle changing straight line is replaced by a graphic element instead of the graphic element constituting the contour line between the two intersections. A groove cutting method using an NC laser cutting machine, wherein the laser head is moved along the groove angle changing straight line and the tilt angle of the laser head is changed by the amount of change in the groove angle. .   2. The NC laser cutting machine according to claim 1, wherein each of the two graphic element groups is composed of a plurality of graphic elements constituting an outline of the same groove angle in the same graphic element group. First cutting method.   When the said location is located on a curve, the 1st straight line of the length equal to the process tolerance of the said cutting process is drawn in the normal line direction of the curve in the location, The 1 or 2 characterized by the above-mentioned. A groove cutting method using the described NC laser cutting machine. Operation for the CAM system to create an NC program for the NC laser cutting machine to perform cutting along the contour line while performing groove processing while gradually changing the groove angle along the predetermined contour line. In the program
When the part is located on a break point from a place arbitrarily determined on the contour line, the direction that bisects the angle between two graphic elements constituting the contour line on both sides of the part, When the point is located on a straight line, the cutting process is performed in the normal direction of the straight line or in a direction that bisects the angle between the two graphic elements constituting the outline following the both ends of the straight line. Drawing a first straight line having a length equal to the tolerance;
Drawing a second straight line through the end point of the first straight line and orthogonal to the first straight line;
Two intersection points between the second straight line and two graphic element groups constituting the contour line on both sides of the portion are respectively obtained, and a portion of the second straight line between the two intersection points is grooved. A step for making a straight line for changing the angle;
The groove angle changing straight line has a length longer than a predetermined length required for the NC laser cutting machine to change the tilt angle of the laser head by the design change amount of the groove angle between the two intersections. A step of determining whether or not
When the groove angle changing straight line has the predetermined length, the groove angle changing straight line is replaced by a graphic element instead of the graphic element constituting the contour line between the two intersections. And changing the inclination angle of the laser head by the amount of change in the groove angle while moving the laser head along the groove angle changing straight line, and
An operation program for a CAM system, in which all these steps are performed by a computer constituting the CAM system.

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