JP2004362270A - Swing angle setting device and method for cutting tool and swing angle setting program for cutting tool - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a swing angle setting device for setting the swing angle of a cutting tool by preventing the bias abrasion of the top end of a cutting tool from being generated, and preventing cutting from being carried out at the center of a rotary shaft. <P>SOLUTION: This swing angle setting device is provided with a tool path acquiring part 11 for acquiring the shape of a face to be worked and a tool path for working the face, a contact angle working time calculating part 12 for calculating a contact angle between the top end of the tool and the face to be worked from the shape of the face to be worked and the tool path and a working time for each contact angle, a swing angle changing part 13 for changing the swing angle of the tool in order to make the working time for each contact angle as equal as possible and an interference check part 14 for checking the interference of the tool and the object to be worked and the face to be worked. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a cutting tool swing angle setting device, a cutting tool swing angle setting method, and a cutting tool swing angle setting program.
[0002]
[Prior art]
Processing of a free-form surface in die processing or the like is performed using a cutting tool called a ball end mill.
[0003]
Conventionally, in a cutting process using such a cutting tool, as long as there is no interference with a workpiece or the like, the machining is performed while the swing angle of the tool is always constant. Here, the swing angle refers to an angle at which the tool is held by a robot arm or the like when performing machining while holding a cutting tool by a robot arm or the like, and the angle is, for example, with respect to a horizontal line or a vertical line. This is the angle of the tool, or the angle between the reference direction of the workpiece or the workpiece surface and the approach direction of the tool.
[0004]
In recent years, with the development of computer technology, the presence or absence of interference with the object to be machined or the machined surface has been searched from the design shape of the object to be machined or the surface, and the machining path (also referred to as the tool path) while maintaining the tool angle so that there is no interference. ) Is automatically set, but even in such a path setting, the once determined tool angle (swing angle) is not changed unless there is interference (for example, see Patent Document 1).
[0005]
[Patent Document 1]
JP-A-7-261815
[Problems to be solved by the invention]
As described above, in the related art, since the machining is performed while the swing angle of the cutting tool is constant, only a part of the tool tip comes into contact with the surface to be machined. For example, as shown in FIG. There has been a problem that only the portion of the cutting blade 102 that is in contact with the processing surface of the cutting blade 102 is unevenly worn or chipping occurs.
[0007]
Further, when such uneven wear occurs, it is necessary to remove the tool once and re-polish it or to replace the tool with a new one even if the cutting blade of the tool is not much worn as a whole. Such tool replacement may be performed in the middle of the work surface, and in such a case, as shown in FIG. However, there is also a problem that a step is generated on the processing surface due to the difference in the mounting position. Further, even if the same mounting position is obtained, the size (curvature radius) of the cutting blade itself changes (as shown in FIG. 22 from R to R ′) due to the polishing operation, as shown in FIG. In addition, a step may occur on the processed surface before and after polishing.
[0008]
Also, if the swing angle is constant, in the case of a shape in which the surface to be machined changes greatly, depending on the shape of the surface to be machined, there is a portion that cuts the surface to be machined at the center of the rotation axis of the tool, There is also a problem that a state in which the surface to be processed is peeled off in a portion without a cutting blade occurs, and the finished surface state is deteriorated.
[0009]
Therefore, an object of the present invention is to automatically change the swing angle of a tool with respect to a machining path so that there is no uneven wear at the tip of a cutting tool and cutting is not performed around the rotation axis. SUMMARY OF THE INVENTION An object of the present invention is to provide a cutting tool swing angle setting device and method capable of performing the same, and a cutting tool swing angle setting program.
[0010]
[Means for Solving the Problems]
The present invention for solving the above object divides a work surface into a plurality of work regions, and forms a contact angle between the tool tip and the work surface in a work path set for each work region and the contact angle. Contact time machining time calculating means for calculating the machining time for each contact angle of the tool for all the machining areas, and the contact angle machining time calculating means for all the machining areas determined by the contact angle machining time calculation means Swing angle changing means for changing the swing angle of the tool in each machining area so that the machining time obtained by accumulating the machining time for each contact angle of the tool is minimized. Setting device.
[0011]
According to another aspect of the present invention, there is provided a method for dividing a surface to be processed into a plurality of processing areas, and for each of the plurality of divided processing areas, the tool tip and the workpiece in a set processing path. Determining a contact angle with a machining surface and machining time for each contact angle, integrating the contact angle and the machining time of the tool for all machining areas, and contacting the tool for all machining areas. Changing the swing angle of the tool in each machining area so that the peak of the machining time obtained by integrating the angle and the machining time is the lowest, wherein the swing angle setting method of the cutting tool is provided. .
[0012]
According to another aspect of the present invention, there is provided a method for dividing a surface to be processed into a plurality of processing areas, and for each of the plurality of divided processing areas, the tool tip and the workpiece in a set processing path. Determining a contact angle with a machining surface and machining time for each contact angle, integrating the machining time for each contact angle of the tool for all machining areas, and contact angles of the tool for all the machining areas; Changing the swing angle of the tool in each machining area so that the machining time obtained by integrating the machining times of the respective tools is minimized.
[0013]
【The invention's effect】
ADVANTAGE OF THE INVENTION According to this invention, the uneven wear of the tool tip which performs a cutting process is eliminated, and almost the whole cutting blade in a tool tip will wear uniformly. For this reason, the load on the machined surface is reduced, and replacement of the cutting blade and the number of polishing steps can be reduced. In addition, since the replacement of the cutting blade and the number of polishing steps are reduced, the number of intermediate replacements in the surface to be processed is reduced (or hardly performed), so that no step is generated on the surface to be processed due to the tool replacement.
[0014]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
[0015]
FIG. 1 is a functional block diagram for explaining a swing angle setting device of a cutting tool.
[0016]
The swing angle setting device 1 for a cutting tool includes a tool path acquisition unit 11 that acquires a shape of a processing surface and a tool path for processing the surface, and a contact between a tool tip and a processing surface based on the processing surface shape and the tool path. A contact angle machining time calculation unit 12 for calculating a machining time for each angle and a contact angle; a swing angle changing unit 13 for changing a tool swing angle so that the machining time for each contact angle is as uniform as possible; An interference check unit 14 for checking interference between the object and the surface to be processed.
[0017]
The swing angle setting device 1 of the cutting tool is actually a computer, and the functions of each unit are provided by executing a flow analysis program created for processing a procedure described later by the computer.
[0018]
The swing angle setting device 1 for the cutting tool includes a display device such as a display or a printer which is usually connected as a computer, an input device such as a keyboard or a pointing device (for example, a mouse) for performing various inputs, and a device after changing the swing angle. An external storage device (including a portable storage device) for storing machining path data (NC data) is connected (both are not shown). Further, the swing angle setting device 1 of the cutting tool is also connected to a network, and the network includes a CAD device that is a data acquisition destination such as a shape of a surface to be processed and a predetermined processing path; A processing device (or a controller thereof) that performs a cutting process based on the processing path data (NC data) after the swing angle is changed is connected.
[0019]
The function of each unit will be described.
[0020]
The tool path acquisition unit 11 receives, from a CAD device or the like, shape data before processing the workpiece, processed surface shape data, tool shape data, and predetermined processing path data of the processed surface (the preset tool path data). (Including swing angle data). Each data acquired here is temporarily stored in the memory of the computer (or an external storage device). The machining path data may read NC data already designed to actually operate the numerical control machine.
[0021]
The contact angle processing time calculation unit 12 functions as a contact angle processing time calculation unit. The contact angle processing time calculation unit 12 obtains the tool tip in the processing path from the shape data of the processing surface and the processing path data acquired and stored by the tool path acquisition unit 11. The machining time for each contact angle between the cutting blade and the surface to be machined is obtained, and the relationship between the contact angle of the tool and the machining time is integrated for all machining areas.
[0022]
Here, a method of obtaining a processing time for each contact angle between the tool and the processing surface in this processing path will be described.
[0023]
FIG. 2 is a schematic view showing the shape of the cutting edge of a general ball end mill.
[0024]
As shown in the figure, the tip of the ball end mill 101 has a substantially circular tip, and a cutting blade 102 is formed around the tip.
[0025]
Here, first, the swing angle and the contact angle of the tool are defined. FIG. 3 is an explanatory diagram for explaining a swing angle, and FIG. 4 is an explanatory diagram for explaining a contact angle.
[0026]
In the present embodiment, as shown in FIG. 3, the tilt angle of the tool center axis S with respect to the vertical line H is defined as the tilt angle α. On the other hand, as shown in FIG. 4, the contact angle between the tool center axis S and the contact line C between the workpiece surface is the contact angle β. The contact line C with the surface to be processed is a line from the center of curvature radius O of the cutting blade 102 of the tool to the point P in contact with the surface to be processed.
[0027]
FIG. 5 is a schematic diagram showing the shape of the surface to be processed, and FIG. 6 is an explanatory diagram for explaining how to obtain a processing time for each contact angle between the tool and the surface to be processed in the processing path.
[0028]
The work surface is a free-form surface whose shape changes gently, as shown in FIG. In the case of such a free-form surface, if the swing angle of the tool is constant, the contact angle of the tool changes as the tool travels along the tool path. Here, the processing surface is divided into a plurality of processing areas (in the case shown, the first processing area to the ninth processing area), and the processing time for each contact angle of the tool is obtained for each processing area. The processing paths in each processing area are connected like a single stroke as shown in FIG. 5B, for example, and are continuous in all the processing areas.
[0029]
The machining time for each contact angle of the tool is, as shown in FIG. 6, the machining time at the contact angle for each region, for example, every time the contact angle changes by one degree. Are accumulated, the processing time for each contact angle of 1 degree can be obtained.
[0030]
That is, as shown in FIG. 6, the processing time is t1 until the contact angle changes once from the contact angle β to (β + 1), and then the contact angle changes from (β + 1) to (β + 2) as the processing path proceeds. Assuming that the processing time until the contact angle becomes t2 and then the processing time until the contact angle changes from β + 2 to β + 1 again is t3,..., The processing time for each change region can be obtained as shown in FIG. Therefore, as shown in FIG. 7B, by multiplying the tool time for each change area of the same contact angle as shown in FIG.
[0031]
Since the speed of moving the tool on the machining path is usually constant, each machining time itself can be obtained by multiplying the moving speed by the distance during which the contact angle on the machining path changes by 1 degree. . Further, the contact angle itself is obtained from the surface shape on the machining path and the contact point position of the tool.
[0032]
Note that the angle of the contact angle to be obtained is not limited to 1 degree, and it is possible to obtain a more precise processing time for each contact angle by setting the angle to a small angle.
[0033]
FIG. 8 is a graph showing the relationship between the contact angle of the tool and the processing time.
[0034]
As shown in FIG. 8A, if the contact angle of the tool is accumulated every 1 degree, the machining time becomes discrete for each angle, and this is taken as the middle point of each angle range as shown in FIG. 8B. To represent a gentle line.
[0035]
Such a relationship between the contact angle of the tool and the machining time is obtained for each machining area obtained by dividing the surface to be machined shown in FIG. FIG. 9 is a graph showing the result of obtaining the relationship between the tool contact angle and the processing time for all the processing areas.
[0036]
The swing angle changing unit 13 functions as a swing angle changing unit. Based on the relationship between the contact angle of the tool and the machining time obtained by the contact angle machining time calculation unit 12 as described above, the cutting blade 102 of the tool is used. Change and set the swing angle of the tool so that it contacts the work surface as evenly as possible.
[0037]
The change of the tool swing angle is performed by changing the tool swing angle for each of the divided machining areas so that the cutting blade 102 of the tool hits the work surface almost uniformly over the entire work surface. However, by changing the swing angle of the tool, the contact angle is set so as not to come into contact with the surface to be machined at the center of the tool axis where the occurrence of wrinkles is concerned.
[0038]
FIG. 10 is a graph in which the relationship between the contact angle of the tool and the processing time is further integrated for all the processing areas shown in FIG.
[0039]
As can be seen from this figure, when the entire machining area is machined with a constant swing angle, the vertex AP of the curve A of the machining time integrated for all machining areas protrudes high, and such a protruding vertex AP appears. In this case, the cutting blade portion that is in contact with the surface to be processed at the contact angle of the vertex AP is partially worn.
[0040]
Therefore, as shown in FIG. 11, the height of the peak AP of the peak of the curve A becomes lower, that is, the processing time obtained by integrating the processing time for each contact angle of the tool in all the processing areas becomes the shortest. By leveling the processing time for each contact angle in each processing area, uneven wear can be prevented.
[0041]
Therefore, the swing angle changing unit 13 changes the swing angle for each machining area and sets an appropriate tool swing angle so that the peak AP of the peak of the curve A of the integrated machining time is as low as possible. At the same time, the swing angle range of the tool is made as narrow as possible.
[0042]
As a specific method for this, for example, the tool swing angle is changed by a predetermined step angle (for example, 1 degree) from the first processing area to the ninth processing area, and the contact angle is changed for each processing area by the angle. The contact angle processing time calculation unit 12 calculates how the change has occurred, draws a curve of the processing time integrated for all the processing areas again, and changes the tool swing angle from the minimum value to the maximum value in a round-robin manner. This method is to find the swing angle at which the peak of the curve becomes the lowest and the tool swing range is narrowed.
[0043]
Here, the minimum value of the tool swing angle is a contact angle at which no wobbling occurs from the viewpoint of wobbling prevention. In this case, as shown in FIG. 12A, when the vicinity of the center axis of the tool hits the surface to be machined, a streak occurs. Therefore, the initial value of the tool deflection angle α is θ, and the contact angle at this time is Assuming that γ, the contact angle at which stuffiness occurs ranges from 0 degrees to γ. Therefore, the tool swing angle at which no warpage occurs is in the range of θ + γ−β, as shown in FIG. Therefore, the minimum value when changing the tool swing angle is θ + γ−β. Normally, γ is a range in which the contact angle is close to 0 °, but since it depends on the size of the tool (the radius of curvature of the cutting blade 102), γ is determined in advance for each tool.
[0044]
On the other hand, the maximum value of the tool swing angle is determined in advance by the interference check unit 14 from the shape of the workpiece and the processing surface for each processing area, regardless of how much the tool is tilted. Is determined, and the angle is set so as not to interfere. By determining the interference state of the tool in advance in this way, when the tool swing angle is changed, the value of this interference check can be used as the maximum value when the tool swing angle is changed. Therefore, in the case of a shape in which interference is expected, since the tool swing angle is not set for the interference area, the time for changing the brute force tool swing angle can be reduced. Note that the maximum tool inclination (that is, the maximum value of the tool swing angle) at the time of this interference check is 90 degrees. Further, depending on the inclination direction of the tool, the inclination of the tool by the interference check may be the minimum value of the tool swing angle.
[0045]
Therefore, the range in which the swing angle can be changed is a range in which no warpage occurs and no interference occurs.
[0046]
FIG. 13 is a diagram illustrating an example of a case where the deflection angle of the tool is changed by such a round robin. In the figure, there are two cases where the vertices of the curve of the integrated machining time are approximately the same. The first case is a case where the change in the contact angle for each processing area is large and each processing area is discrete. On the other hand, the second case is a case where the contact angles of the respective processing regions are almost connected.
[0047]
As described above, even when the peaks of the peaks of the curve of the integrated machining time are substantially the same, the contact angles of the respective machining regions are greatly different. The second case is adopted. This is to prevent such irregular wear because the cutting edge 102 of the tool is undesirably worn as a whole if it has a discrete contact angle.
[0048]
The interference check unit 14 checks whether a tool does not interfere with a workpiece, a machined surface, or another object on each path. As described above, the interference check in the interference check unit 14 is performed by setting the tool swing angle at which interference is expected for each machining region in advance before the change of the tool swing angle with the design data of the workpiece and the workpiece surface. In addition to obtaining from the tool shape, the presence or absence of interference with other objects is checked in all machining areas after the tool swing angle is changed.
[0049]
Next, the procedure of the processing for changing the tool swing angle by the cutting tool swing angle setting device 1 will be described.
[0050]
FIG. 14 is a flowchart showing the overall procedure for changing the tool swing angle, and FIG. 15 is a flowchart showing the procedure for changing the tool swing angle.
[0051]
First, the overall processing procedure will be described with reference to FIG.
[0052]
First, the tool path obtaining unit 11 obtains a workpiece shape, a workpiece surface shape, a tool shape, and a preset tool path from a CAD device or the like (S1).
[0053]
Subsequently, the contact angle processing time calculation unit 12 divides the processing surface into a plurality of processing regions based on the acquired shape data of the processing surface (S2). Here, as a criterion for division, for example, division is performed so that the length of each processing path is the same, or division is performed so that the area of each processing region is the same.
[0054]
Subsequently, the swing angle of the tool is changed and set (S3). The details of this process will be described later.
[0055]
Subsequently, the interference check unit 14 checks whether or not there is interference in all the machining paths based on the finally set swing angle (S4). This interference check is a process of finally checking the interference between the tool and the workpiece, the workpiece surface, and other objects (for example, a clamp jig for holding the workpiece). As described above, since the presence or absence of interference has already been included in the swing angle changeable range of the tool when changing the swing angle, the interference is not normally detected here. If it is detected, some error is considered, so that the error is output (S5), and the processing is terminated, while if there is no interference, the processing path data in which the changed tool swing angle is set is output. Then (S6), the process ends.
[0056]
Next, a procedure for changing and setting the tool swing angle will be described with reference to FIG.
[0057]
Here, first, the settable range of the swing angle in each processing area is calculated (S11). As for the settable range of the swing angle, the contact angle processing time calculation unit 12 obtains a minimum angle at which no warpage occurs for each processing area, and the interference check unit 14 obtains a maximum angle at which no interference occurs for each processing area.
[0058]
Subsequently, the contact angle processing time calculation unit 12 obtains the relationship between the contact angle at the initial swing angle and the processing time in each processing area (S12). Thereby, for example, as shown in FIG. 16, the relationship between the contact angle of each processing region and the processing time is obtained, and the previously settable range is added.
[0059]
Subsequently, the swing angle changing unit 13 sets 1 as the initial value of n (S13), and subsequently, the swing angle of the n-th machining area obtained in step S11 as the initial value of the swing angle of the n-th machining area. The minimum value of the settable range is set (S14).
[0060]
Subsequently, the swing angle changing unit 13 changes the swing angle by adding a predetermined angle (for example, 1 degree) to the n-th machining area (S15).
[0061]
Then, the relationship between the contact angle and the processing time is obtained again by the contact angle processing time calculation unit 12 based on the changed swing angle (actually, it is sufficient to obtain only the relationship between the n-th processing area with the changed swing angle) and the entire processing area. The processing time integrated for each contact angle is obtained and stored (S16). Thereby, for example, as shown in FIG. 17, the relationship between the contact angle after changing the swing angle of the n-th processing area and the processing time and the integrated processing time for each contact angle in all the processing areas are obtained.
[0062]
Subsequently, it is determined whether or not the swing angle has reached the maximum value of the changeable setting in the n-th machining area (S17), and if not, the process returns to step S15 and continues. On the other hand, when the swing angle reaches the maximum value of the changeable setting in the n-th machining area, the peak of the integrated machining time curve obtained for each contact angle of the entire machining area is the lowest, and The swing angle at which the range of the swing angle of the area becomes the narrowest is set as the swing angle of the n-th machining area (S18).
[0063]
Subsequently, it is determined whether or not n has reached the maximum value of the number of processing regions (S19). If not, n is incremented (S20), and the process returns to step S14 to continue the process. On the other hand, if n reaches the maximum value of the number of processing areas, subsequently, the swing angles of all the processing areas are set in the processing path data and output as processing path data (S21). This makes it possible to change the swing angle of each processing area by brute force, and to set the peak of the processing time curve obtained by integrating all the processing areas for each contact angle at the lowest, and to set the swing angle with the narrowest swing angle range. Are determined. FIG. 18 shows an example of the relationship between the contact angle after the change of the swing angle of each processing region and the processing time determined here and the integrated processing time for each contact angle of all the processing regions.
[0064]
Thereafter, the process returns to step S4 of the main routine described above.
[0065]
As described above, according to the present embodiment, as shown in FIG. 19, uneven wear that has conventionally occurred when cutting is performed at a constant swing angle is eliminated, and almost the entire cutting blade 102 is uniformly worn. Will do. For this reason, the load on the processing surface is reduced, and the replacement of the cutting blade 102 and the number of polishing steps can be reduced. In addition, since the replacement of the cutting blade 102 and the reduction in the number of polishing steps are reduced, the number of replacements in the processing surface is reduced (or hardly performed), so that the generation of a step on the processing surface due to the tool replacement does not occur.
[0066]
Further, in the present embodiment, when changing the tool swing angle, a changeable range of the tool swing angle is set so as not to perform processing such as peeling a work surface near the center axis of the tool. Therefore, machining near the center axis of the tool is not performed, and a good machining surface can always be obtained.
[Brief description of the drawings]
FIG. 1 is a functional block diagram for explaining a swing angle setting device of a cutting tool.
FIG. 2 is a schematic view showing a shape of a cutting edge of a general ball end mill.
FIG. 3 is an explanatory diagram for explaining a swing angle.
FIG. 4 is an explanatory diagram for explaining a contact angle.
FIG. 5 is a schematic diagram showing a shape of a surface to be processed.
FIG. 6 is an explanatory diagram for explaining a method of obtaining a processing time for each contact angle between a tool and a processing surface in a processing path.
FIG. 7 is an explanatory diagram for explaining a processing time for each contact angle change region and an integration thereof.
FIG. 8 is a graph showing a relationship between a tool contact angle and a processing time.
FIG. 9 is a graph showing a result of obtaining a relationship between a tool contact angle and a processing time in a processing area.
10 is a graph in which the relationship between the contact angle of the tool and the processing time is further integrated for all the processing areas shown in FIG. 9;
FIG. 11 is an explanatory diagram illustrating equalization of processing time for each contact angle of each processing area.
FIG. 12 is an explanatory diagram for explaining a contact angle at which no warp occurs.
FIG. 13 is a diagram illustrating an example of a case where the deflection angle of a tool is changed by brute force.
FIG. 14 is a flowchart illustrating an overall processing procedure for changing the swing angle of the tool.
FIG. 15 is a flowchart illustrating a processing procedure for changing a tool swing angle.
FIG. 16 is a diagram showing an example of a relationship between a contact angle of each processing area and a processing time, and an example of a settable range.
FIG. 17 is a diagram showing an example of a relationship between a contact angle and a machining time after changing a swing angle of an n-th machining region and an example of an accumulated machining time for each contact angle in all machining regions.
FIG. 18 is a diagram illustrating an example of a relationship between a determined contact angle and a machining time of each machining area after a change in the machining angle, and an example of an accumulated machining time for each contact angle of all machining areas.
FIG. 19 is a view showing a state in which uneven wear of the tool cutting blade is eliminated.
FIG. 20 is a view showing occurrence of uneven wear and chipping in a conventional tool cutting blade.
FIG. 21 is an explanatory diagram for explaining a difference in a mounting position that occurs before and after a conventional tool exchange.
FIG. 22 is a view for explaining a difference in the size of a cutting blade itself due to a polishing operation of a conventional tool.
[Explanation of symbols]
1 ... Angle setting device,
11 ... Tool path acquisition unit
12 contact angle processing time calculation unit
13 ... corner changing part,
14 ... Interference check unit
101 ... ball end mill,
102 ... Cutting blade.

Claims (8)

The work surface is divided into a plurality of work areas, and a contact angle between the tool tip and the work surface in a work path set for each work area and a work time for each contact angle are obtained. Contact angle machining time calculation means for integrating the machining time for each contact angle of the tool for the area,
A swing for changing the swing angle of the tool in each machining area so that the machining time obtained by integrating the machining time for each contact angle of the tool for all the machining areas obtained by the contact angle machining time calculation means is the shortest. Angle changing means,
A swing angle setting device for a cutting tool, comprising: 2. The swing of the cutting tool according to claim 1, wherein the swing angle changing unit changes the swing angle so that the swing angle does not become an angle in contact with the surface to be processed near the center axis of the tool. Angle setting device. The swing angle changing means is configured such that the machining time obtained by integrating the machining time for each contact angle of the tool for all the machining areas is the shortest, and the swing angle range is the narrowest. The swing angle setting device for a cutting tool according to claim 1, wherein the swing angle of the tool is changed. Dividing the work surface into a plurality of machining regions;
For each of the plurality of divided machining areas, a contact angle between the tool tip and the surface to be machined in a set machining path and a machining time for each contact angle are determined, and contact of the tool with respect to all the machining areas is determined. Integrating the machining time for each corner,
Changing the swing angle of the tool in each machining area so that the machining time obtained by integrating the machining time for each contact angle of the tool for all the machining areas is minimized,
A method for setting a swing angle of a cutting tool. The swing angle setting method for a cutting tool according to claim 4, wherein the swing angle is changed so that the swing angle does not become an angle in contact with the surface to be processed near the center axis of the tool. The step of changing the swing angle of the tool in each machining area is such that the machining time obtained by integrating the machining time for each contact angle of the tool for all the machining areas is the shortest, and the swing angle range is the most. The swing angle setting method for a cutting tool according to claim 4 or 5, wherein the swing angle of the tool in each machining area is changed so as to be narrow. Dividing the processing surface into a plurality of processing regions;
Setting a changeable range of the tool swing angle for each of the plurality of divided machining areas,
The contact angle between the tool tip and the surface to be machined in the machining path and the machining time for each contact angle are determined for each of the plurality of machining regions, and the machining time for each contact angle of the tool is determined for all the machining regions. Multiplying
Changing the swing angle of the tool in each processing area within the changeable range so that the processing time obtained by integrating the processing time for each contact angle of the tool for all the processing areas is minimized,
A swing angle setting program for a cutting tool, comprising: 8. The swing angle setting program for a cutting tool according to claim 7, wherein the changeable range is an angle that does not come into contact with the work surface in the vicinity of the center axis of the tool.

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