JP2004174620A - Cutting device and setting program for travel path data for cutting - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To prevent a cut material from being left undone by taking into consideration a change amount of bending of a rotary cutting tool including bending of an NC machine tool as well as bending of the rotary cutting tool in cutting, preventing the occurrence of bite-in due to a change of bending deformation amount of the machine tool or the rotary cutting tool in a low speed region where the feed speed is lowered, and relatively approaching from the cut material in a high speed region. <P>SOLUTION: In setting data on a travel path for controlling the position of the rotary cutting tool, bending in the whole NC machine tool finely corresponding to the current cutting status is previously tested (mainly FEM numerical value analysis), and corrected travel path data corrected based on the test data is set as travel path data, whereby the tool is once delivered along the travel path (a cutting path). <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a cutting apparatus for performing cutting by a rotary cutting tool and a program for setting the moving path data for the cutting, and particularly relates to bending between a machine tool and a rotary cutting tool due to a change in feed speed of the rotary cutting tool. The present invention relates to a technique for preventing the uncut portion resulting from the cutting.
[0002]
[Prior art]
Using a NC (Numerical Control) machine tool, the rotary cutting tool is driven to rotate relative to the workpiece in accordance with predetermined moving path data including a direction intersecting the axis while rotating the rotary cutting tool around the axis. As a result, cutting of a free-form surface or the like on the workpiece is widely performed in various fields such as die machining.
[0003]
In such a cutting process, the amount of bending deformation of a machine tool or a rotary cutting tool changes with a change in the feed speed of the rotary cutting tool. When the feed speed is reduced, the bending deformation of the machine tool or the rotary cutting tool returns and straightens, causing a bite in comparison with other parts and causing a problem of excessively deep cutting (for example, Patent Document 1). .
[0004]
In order to solve this problem, for example, in the case of the apparatus described in Japanese Patent Application Laid-Open No. 8-257875, the axial position of the cutting edge position caused by a change in the amount of bending deformation of the rotary cutting tool accompanying a change in the feed rate is determined. The axial position of the rotary cutting tool is relatively separated from the workpiece by a predetermined correction amount set as a substantially minimum value (Patent Document 2).
[0005]
[Patent Document 1]
JP-A-55-58949 [Patent Document 2]
JP-A-8-257875
[Problems to be solved by the invention]
However, in actual cutting, the change in the position of the rotary cutting tool is affected not only by the bending of the tool itself but also by the bending of the NC machine tool supporting the tool.
[0007]
Therefore, when the feed direction of the rotary cutting tool is decelerated, as in the above-described conventional apparatus that focuses only on the rotary cutting tool, cutting in a low-speed region is performed too deeply than cutting at other positions. Fine adjustment cannot be performed only by adopting a method of separating the tool from the workpiece in a low-speed region where biting occurs for the purpose of solving the adverse effects.
[0008]
As a result, if it is an essential condition to avoid excessive cutting in the low-speed area, the room where the uncut occurs in the high-speed area where the area is rather large in the processing range is tolerated, and the remaining uncut part is separately cut by various means. And it was not possible to perform complete cutting by one control means.
[0009]
The present invention has been made in view of such a point, and an object of the present invention is to change the amount of deflection change of a rotary cutting tool including not only the deflection of a rotary cutting tool at the time of cutting but also the deflection of an NC machine tool. In the low-speed area where the feed rate is small, by making it relatively close to the workpiece in the high-speed area while preventing the bite from occurring due to the change in the amount of bending deformation of the machine tool or rotary cutting tool The purpose is to prevent uncut parts.
[0010]
[Means for Solving the Problems]
In order to solve the above-described problems, the present invention preliminarily tests the deflection of the entire NC machine tool corresponding to the actual cutting situation in advance when setting the movement path data for controlling the position of the rotary cutting tool ( A tool is sent out along a moving path (cutting path) by setting a corrected moving path data corrected based on the experimental data as a moving path data in advance by conducting an experiment mainly by FEM numerical analysis. And
[0011]
More specifically, the present invention provides the following.
[0012]
(1) A predetermined cutting process is performed on the workpiece by rotating the rotary cutting tool relative to the workpiece while including a direction intersecting the axis three-dimensionally while rotating the rotary cutting tool about the axis. A cutting machine, comprising: machining at a cutting point of the rotary cutting tool using static rigidity / dynamic rigidity experimental data of an NC machine tool, machining experimental data of a rotary cutting tool, and FEM numerical analysis data. A three-dimensional incision correction for calculating a three-dimensional bending deformation amount at a cutting edge position caused by bending deformation between a machine and a tool, and cutting an uncut amount of a workpiece at a cutting edge position caused by the three-dimensional bending deformation amount. A three-dimensional position of the rotary cutting tool is relatively approached to the workpiece by an amount.
[0013]
When the NC machine tool is operated, the rotary cutting tool bends greatly in a high-speed region where the feed speed is high, and flexes slightly in a low-speed region where the feed speed is low. As described above, there is a problem that the position of the rotary cutting tool with respect to the position changes, and the amount of cutting varies depending on each region.
[0014]
To solve this problem, in the conventional apparatus, when transitioning from the high-speed region to the low-speed region, correction is performed according to the axial displacement amount of the cutting edge, but the actual cutting edge displacement is only the deflection of the rotary cutting tool. In addition, since it is also affected by the bending of the NC machine tool itself, priority is given to preventing biting (excessive cutting) in a low-speed region where once it is cut, it cannot be corrected later. Uncut parts in the high-speed area, which occupies most of the work, were to be accepted.
[0015]
According to the present invention, the bending of not only the rotary cutting tool but also the entire NC machine tool is previously tested in accordance with the type of tool and the rotation speed, and the rotary cutting tool can be positioned with respect to the non-cutting object based on the experimental data. Can be controlled. In other words, according to the cutting apparatus of the present invention, when setting the movement path data for controlling the position of the rotary cutting tool, the deflection of the entire NC machine tool corresponding to the actual cutting condition in advance is previously tested. By setting the corrected movement path data corrected based on the experimental data as the movement path data, it is possible to perform high-precision cutting by sending out the tool once along the movement path (cutting path). In addition to preventing biting, it is possible to reduce the need for rework due to uncut portions.
[0016]
(2) The relative movement of the rotary cutting tool is moved based on predetermined movement path data, and the movement path data is corrected based on the three-dimensional cutting correction amount when performing cutting, The step of setting the movement path data to be corrected includes an SN calculation step of obtaining an SN at a cutting point of the NC machine tool from the movement path data, and a correction function based on the DSM of the NC machine tool and the rotary cutting tool. And an interpolation step of interpolating and setting a correction movement path data of a three-dimensional bending deformation amount of the rotary cutting tool by a combination interpolation of the SN calculation and the correction function. (1) The apparatus for cutting according to (1).
[0017]
According to the present invention, it is possible to correct and set travel route data based on FEM numerical experiment data under predetermined conditions so that cutting is performed according to the above-described cutting apparatus. That is, the correction movement path data is obtained by obtaining the tool rotation speed and the feed rate in the cutting to the target workpiece from the predetermined movement path data, and obtaining the corresponding three-dimensional bending deformation amount of the rotary cutting tool. Set.
[0018]
More specifically, an SN operation for obtaining an SN (Surface Normal) at a cutting point of the NC machine tool from preset movement path data is performed, and further, based on a DSM (Dynamic Stiffness Matrix) of the NC machine tool and the rotary cutting tool. The correction function is set by setting the correction function, and the correction movement path data of the three-dimensional bending deformation amount of the rotary cutting tool is interpolated and set by the combination of the SN calculation and the correction function. As a result, it is possible to correct the movement path data (database) set in advance from the FEM numerical experiment data and perform control so that an appropriate cutting edge position can be positioned in the entire cutting area, thereby preventing biting in a low speed area. In addition, the uncut portion in the high-speed region can be avoided. As a result, the necessity of performing reworking or the like after the completion of the cutting process by the present apparatus is reduced, and high-precision cutting can be performed more quickly, and the cutting cost and the yield of the workpiece are improved.
[0019]
(3) A predetermined cutting process is performed on the work by rotating the rotary cutting tool about the axis and moving the rotary cutting tool relative to the work including a direction intersecting the axis three-dimensionally. The machining at the cutting point of the rotary cutting tool using the static rigidity / dynamic rigidity experimental data of the NC machine tool, the machining experimental data of the rotary cutting tool, and the FEM numerical analysis data for the cutting device. Calculating a three-dimensional bending deformation amount at the cutting edge position caused by bending deformation between the machine and the tool; and a three-dimensional deformation method for reducing an uncut amount of the workpiece at the cutting edge position caused by the three-dimensional bending deformation amount. A step of causing the three-dimensional position of the rotary cutting tool to relatively approach the workpiece by an amount of the cut correction amount;
[0020]
(4) The relative movement of the rotary cutting tool is moved based on predetermined movement path data, and the movement path data is corrected based on the three-dimensional cutting correction amount when performing cutting. The step of setting the corrected movement path data includes an SN calculation step of obtaining an SN at a cutting point of the NC machine tool from the movement path data, and a DSM between the NC machine tool and the rotary cutting tool. A correction function setting step of setting a correction function based on the correction function, and an interpolation step of interpolating and setting correction movement path data of a three-dimensional bending deformation amount of the rotary cutting tool by a combination interpolation of the SN calculation and the correction function. (3) The program for setting the moving path data for cutting according to (3).
[0021]
According to the present invention, a tool rotation speed and a feed speed in cutting to a target workpiece are determined from predetermined movement path data, and a corresponding three-dimensional bending deformation amount of the rotary cutting tool is determined. Set the corrected movement route data. In addition, it is possible to correct and set the movement path data based on the FEM numerical experiment data on the predetermined condition so that the cutting is performed according to the setting program of the cutting movement path data of the cutting apparatus described above.
[0022]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
[0023]
FIG. 1 is a block diagram illustrating an NC processing system of a cutting device according to an embodiment of the present invention.
[0024]
The NC processing system generally includes a database 36, a CAM system 10, an NC data memory 11, and an NC machine tool 12.
[0025]
The database 36 includes information necessary for creating the movement route data CL, specifically, product shape data and a tool shape used for machining, such as a radius of the ball end mill 18 (see FIG. 3), and a cutting time. Information required to determine the axial displacement of the cutting edge position due to the bending deformation of the machine tool or the ball end mill 18, specifically, the bending deformation of the machine tool, the Young's modulus of the tool, the second moment of area, the tool length , The tool diameter, the cutting depth per blade, the peripheral speed, the specific cutting resistance of the workpiece 24, and the like are stored.
[0026]
The DSM can be obtained from the feed direction and the tool rotation speed obtained from the above-described parameters such as the tool length, the tool diameter, the cutting depth of one blade, the peripheral speed, and the like. The deflection can be calculated by taking this into account.
[0027]
The CAM (Computer Aided Manufacturing) system 10 creates NC data including movement route data CL using a microcomputer having a CPU, a RAM, a ROM, and the like. More specifically, it includes an arithmetic processing unit 30, an SN arithmetic unit 38, a correction function setting unit 40, a movement route data complement setting unit 60, and a corrected movement route data setting unit 34. With these configurations, the travel route data in the NC data is corrected and created in accordance with the flowchart shown in FIG. 2 while reading necessary information from the preset travel route database 36.
[0028]
The NC data memory 11 is configured by a storage medium such as a magnetic tape or a magnetic disk, and stores NC data.
[0029]
The NC machine tool 12 controls cutting according to the NC data stored in the NC data memory 11. The NC machine tool 12 includes an NC control unit 14 and an NC operation unit 16.
[0030]
Here, the NC control unit 14 includes a microcomputer having a CPU, a RAM, a ROM, and the like, and controls the operation of the NC operation unit 16 according to the NC data stored in the NC data memory 11. It comprises a feed speed position control means 28.
[0031]
On the other hand, the NC operation unit 16 includes a main shaft rotation drive unit 20, a feed drive unit 22, and a tool position detection unit 24.
[0032]
As shown in, for example, FIG. 3, the NC operation unit 16 includes a ball end mill 18 as a rotary cutting tool, a main shaft rotation driving unit 20 that rotationally drives the ball end mill 18 around an axis parallel to the Z axis, and a ball end mill. A feed driving means 22 for moving the ball end mill 18 three-dimensionally in parallel in the X-axis, Y-axis, and Z-axis directions, and a predetermined moving path including a direction intersecting the axis while rotating the ball end mill 18 By relatively moving the work 24 in accordance with the data CL, the work 24 is cut into a free-form surface or the like. The main shaft rotation driving means 20 is an electric motor such as a servo motor, for example, and the feed driving means 22 is configured to include, for example, three sets of feed screws for moving in three axial directions and a servo motor for rotating the feed screws. You.
[0033]
Next, a procedure for setting the movement route data CL in the CAM system 10 will be described with reference to FIG.
[0034]
First, the product shape data to be processed and the data of the ball end mill 18 to be used are read from the database 36 in accordance with the input operation of the operator on the input operation means such as a keyboard, and the product shape data is displayed on an image display device such as a liquid crystal panel. That is, the processing surface shape is displayed (S1).
[0035]
Next, in a state where the processing surface 40 is projected on a plane viewed from the Z-axis direction and on a two-dimensional plane of XY, a moving path of the tool is set by an input operation of an operator and a cutting line is created. (S2).
[0036]
Next, an intersection line between the movement path, the plane including the Z axis, and the processing surface 40 is determined, and the intersection line is determined as the processing surface movement path 42, and the three-dimensional XYZ coordinates representing the movement path 42 are used as the processing surface movement. It is created as route data (S3).
[0037]
Here, FIG. 4 shows that the ball end mill 18 is reciprocated in the X-axis direction, and at the end of the movement in the X-axis direction is moved in the Y-axis direction by the pick feed dimension P set by an input operation or the like. In this case, the moving route 42 can be arbitrarily determined. The processing surface movement path data also includes data on the approach section 44 and the retract section 46 in addition to the movement path 42.
[0038]
Then, the acceleration and deceleration range Q to decelerate and accelerate the feed speed F as a slow feed rate F _2, calculated from the acceleration ± a during acceleration or deceleration of the NC machine tool 12, including its acceleration and deceleration range Q set Request low speed range where the ball end mill 18 is moved at a low feed speed F than feedrate F ₁ (S4).
[0039]
The calculation of the low speed region will be described with reference to FIGS.
[0040]
In FIG. 7, in the pick operation unit 42a in which the feed direction is rotated by 180 degrees at the end of the movement path 42 in the X-axis direction, the smallest ratio due to the feed direction being reversed by approximately 180 degrees, for example, the set feed speed F ₁ with slow feed rate F ₂ of the order of 1/3 is set, acceleration and deceleration range Q is determined using the acceleration ± a, its acceleration and deceleration range deceleration control start point from Q a and the deceleration control end point D Configuring (See FIG. 8). The range from the deceleration control start point A to the deceleration control end point D is a low-speed region.
[0041]
Step S4 is executed by the formula calculating means 30 based on the movement route 42 set in step S3, and calculates a necessary low-speed area by the calculation in step S8 and subsequent steps. That is, in the pick operation unit 42a in which the feed direction is reversed by 180 degrees at the X-axis direction movement end in the movement path 42, the feed speed F is reduced by the deceleration control of the NC machine tool 12 in order to secure the positional accuracy. The bending deformation (bending) of the machine tool and the ball end mill 18 is returned due to the decrease of the feed speed F, and the ball end mill 18 is cut into the workpiece 24 to cause excessive cutting. This is to perform a process of correcting the movement route data CL for escape in the three-dimensional axis direction.
[0042]
Such a bite occurs not only in the pig operating section 42a but also in a portion where the feed direction of the ball end mill 18 greatly changes, such as the approach portion 44 and the retrack portion 46. In the approach portion 44, the bending deformation amount of the ball end mill 18 is substantially zero, but when the movement in the X-axis direction starts, the ball end mill 18 bends due to the cutting resistance, so that the approach portion 44 is bitten as a result.
[0043]
Referring to FIG. 9, (b) illustrates a state after processing according to the related art, and (a) illustrates a state after processing according to the present invention. In the prior art, only the Z-axis is separated only in the low-speed region, so that uncut portions occur in the high-speed region. In addition, interpolation in the Y-axis direction has not been performed. In the present invention, since the three-dimensional movement path is set based on the high-speed region, the three-dimensional correction of the rotary cutting tool 18 prevents the uncut portion in the high-speed region and excessive cutting in the low-speed region as shown in FIG. Yes, no additional processing means is required.
[0044]
In FIG. 2, in step S5, information on machine tools, tools, and cutting conditions required in the arithmetic processing in step S6 and subsequent steps is read from the database 36, and in step S6, SN computation and correction function arithmetic required in the arithmetic processing in step S7 and subsequent steps are performed. Do. In step S7, a correction offset amount is calculated.
[0045]
This step S6 corresponds to a correction function setting step of setting a correction function based on the DSM of the NC machine tool and the rotary cutting tool, and is executed by the correction function setting means 40. When the cutting is performed while moving the ball end mill 18, the three-dimensional bending change vector (bending) of the machine tool or the rotary cutting tool shown in FIG. 5 is calculated and set as a correction vector. That is, in the present embodiment, regardless of the actual change in the feed rate, the position of the tool center in the XYZ axis direction changes due to the bending of the tool and the machine tool when cutting is performed at the set feed rate and the tool rotation speed. The correction amount is set so that no uncut portion is left even if it is left.
[0046]
In the above example, different slow feed rate F ₂ by the feeding direction of the change (angle), although acceleration during acceleration and deceleration is a predetermined value ± a, or a slow feed rate F ₂ is constant, pressurized by cutting conditions Since the deceleration function of the NC machine tool 12 differs depending on the type, for example, when the acceleration at the time of deceleration is different, the deceleration function of the NC machine tool 12 required to obtain the above-mentioned low-speed region according to the deceleration function of the NC machine tool 12 to be used is Are set in advance in the database 36 for each model.
[0047]
Next, an SN calculation (S8) is performed, and further, the correction movement path data of the three-dimensional bending deformation amount of the rotary cutting tool by interpolation combination of the SN calculation and the correction function is set by interpolation to calculate the movement path data. (S9). As a result, the final movement path data CL is set, stored in the NC data memory 11 together with the data relating to the cutting conditions such as the set feed speed F1, the cutting depth A, and the spindle speed, and sent to the NC machine tool 12.
[0048]
The NC control unit 14 of the NC machine tool 12 functionally includes a feed speed position control unit 28. The NC control unit 16 also includes a spindle rotation control unit (not shown), and controls the operation of the spindle rotation driving unit 20 so as to rotate the spindle at the spindle rotation number set in the NC data memory 11. .
[0049]
Feed speed position control means 28, so that the ball end mill 18 is moved in accordance with movement path 42 representing the moving path data CL at a set feed speed F _1, by comparison with the actual tool position detected by the tool position detection means 28 The operation of the feed driving means 22 is controlled. The feed speed position control means 28 performs deceleration control according to the information supplied from the tool position detection means 28, and, for example, the pig operation part 42a controls the feed speed as shown in FIG.
[0050]
FIG. 10 is a flowchart for explaining the NC processing system of the cutting apparatus according to the preferred embodiment of the present invention.
[0051]
First, processing conditions and tool data are read from data stored in a preset database 36 (S21). As described above, the database 36 is set from experimental data corresponding to a specific NC machine tool and tool, FEM numerical analysis data, and the like. Specifically, the database includes data of the NC machine tool, data of the ball end mill 18 and the like to be used, and input data of the operator by input operation means such as a keyboard.
[0052]
Next, the movement path data CL on the surface of the non-cut object is read, and a region where the non-cut object is cut, that is, a processing region is detected (S22). These processes are executed by the CAM system 10, and the specific procedure is as described above.
[0053]
Next, it is determined whether or not the workpiece 24 is in the processing area (S23). Here, when it is determined that it is not in the processing area, the process jumps to step S28, and outputs the moving route data CL without performing the correction process. On the other hand, when it is determined that it is in the processing area, the process proceeds to the CL correction setting process from step S24.
[0054]
First, in step S24, the dynamic rigidity matrix of the NC machine tool / tool under the machining area is read. This is to read the dynamic rigidity of the NC machine tool and the tool during the operation of the NC machine tool, and is a prerequisite for calculating the deflection of the NC machine tool and the tool, which is the next step.
[0055]
Next, the amount of bending deformation of the NC machine tool / tool at the cutting point, that is, the amount of separation from the cutting edge with respect to the workpiece is calculated based on the dynamic rigidity matrix read as described above (S25).
[0056]
Next, a tool movement path correction function calculation at the cutting point is performed (S26). This corresponds to a correction function setting step, and is set based on the DSM of the NC machine tool and the rotary cutting tool.
[0057]
Further, a corrected tool movement path is sequentially calculated (S27). This step is a step of complementarily setting appropriate movement path data by combining the already calculated bending deformation amount and the moving path correction function of the cutting edge. Based on the complementarily set movement path CL, the movement is performed in step S28. The route CL is output. The movement path data CL output in this manner is stored in the memory 11, and the NC machine tool is actually controlled and operated based on the data in the memory 11. The control and operation of the NC machine tool are as described above with reference to FIG.
[0058]
【The invention's effect】
As described above, according to the present invention, uncut portions in a high-speed region and bite in a low-speed region are reliably prevented. Further, when the movement path data CL is created by the CAM system, a low-speed area is determined according to the deceleration function of the NC machine tool used, and the three-dimensional axial position of the movement path data CL in the low-speed area is corrected by the correction amount. Since the correction is performed and the three-dimensional axial position of the movement path data CL is corrected by the correction amount even in the high-speed region, there is no need to make any design change on the NC machine tool itself. Can be used as is.
[Brief description of the drawings]
FIG. 1 is a block diagram illustrating an NC processing system of a cutting apparatus according to an embodiment of the present invention. FIG. 2 illustrates a procedure when setting a movement route data CL in the CAM system of FIG. It is a flowchart.
FIG. 3 is a diagram illustrating an example of an NC operation unit of the NC machine tool in FIG.
FIG. 4 is a diagram illustrating an example when setting a tool movement path in the CAM system of FIG. 1;
FIG. 5 is a diagram illustrating a correction offset amount in step S7 of FIG. 2;
FIG. 6 is a diagram illustrating a maximum chip thickness in a tool radial direction used for obtaining a cutting force when calculating a correction offset amount in step S7 of FIG. 2;
FIG. 7 is a diagram specifically illustrating an acceleration / deceleration range Q of a pig operation unit in a low speed region obtained in step S9 of FIG. 2;
FIG. 8 is a diagram illustrating an example of a change in feed speed in a pick operation unit in FIG. 7;
FIG. 9 is a diagram for comparing and explaining a conventional technique and the present invention.
FIG. 10 is a flowchart illustrating an NC processing system of a cutting device according to a preferred embodiment of the present invention.
[Explanation of symbols]
16 NC operation unit 18 Ball end mill 20 Spindle rotation drive unit 22 Feed drive unit 24 Workpiece 40 Offset surface 42 Movement path 42a Pick operation unit 44 Approach unit 46 Retract unit

Claims (4)

For a cutting operation for performing a predetermined cutting operation on a workpiece by rotating a rotary cutting tool relative to the workpiece including a direction intersecting three-dimensionally with the axis while rotating the rotary cutting tool about the axis. A device,
Using the static rigidity / dynamic rigidity experimental data of the NC machine tool, the machining experimental data of the rotary cutting tool, and the FEM numerical analysis data, the bending deformation of the machine tool and the tool at the cutting point of the rotary cutting tool is used. The three-dimensional bending deformation amount of the generated cutting edge position is calculated, and the rotation cutting tool is adjusted by the three-dimensional cutting correction amount that cuts the remaining uncut amount of the workpiece at the cutting edge position caused by the three-dimensional bending deformation amount. An apparatus for cutting, wherein a three-dimensional position is relatively approached to the workpiece. The relative movement of the rotary cutting tool is moved based on preset movement path data, and the movement path data is corrected based on the three-dimensional cutting correction amount when performing cutting, and the corrected movement path data is corrected. The moving path data setting step includes setting an SN function for obtaining an SN at a cutting point of the NC machine tool from the moving path data, and setting a correction function based on the DSM between the NC machine tool and the rotary cutting tool. A correction function setting step, and an interpolation step of interpolating and setting correction movement path data of a three-dimensional bending deformation amount of the rotary cutting tool by a combination interpolation of the SN calculation and the correction function. 2. The apparatus for cutting according to 1. For a cutting operation for performing a predetermined cutting operation on a workpiece by rotating a rotary cutting tool relative to the workpiece including a direction intersecting three-dimensionally with the axis while rotating the rotary cutting tool about the axis. For the device
Using the static rigidity / dynamic rigidity experimental data of the NC machine tool, the machining experimental data of the rotary cutting tool, and the FEM numerical analysis data, the bending deformation of the machine tool and the tool at the cutting point of the rotary cutting tool is used. Calculating a three-dimensional bending deformation amount of the generated cutting edge position;
The three-dimensional position of the rotary cutting tool is set relative to the workpiece by a three-dimensional cutting correction amount that cuts the uncut amount of the workpiece at the cutting edge position caused by the three-dimensional bending deformation amount. Approaching,
Program for setting the movement path data for cutting to execute the program. The relative movement of the rotary cutting tool is moved based on predetermined movement path data, and the movement path data is corrected based on the three-dimensional cutting correction amount when performing cutting. ,
The setting process of the moving route data to be corrected includes:
An SN calculation step of obtaining an SN at a cutting point of the NC machine tool from the movement path data;
A correction function setting step of setting a correction function based on the DSM of the NC machine tool and the rotary cutting tool;
An interpolation step of interpolating and setting a correction movement path data of a three-dimensional bending deformation amount of the rotary cutting tool by a combination interpolation of the SN calculation and the correction function;
4. The program according to claim 3, further comprising: a moving path data for cutting process.

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