JP2014164307A - Numerical control device with numerical control information creation function - Google Patents

Abstract

PROBLEM TO BE SOLVED: To solve such the problem that an operator adjusts a rotation speed variation parameter in order to periodically vary a rotation speed of a tool or a workpiece so as to prevent occurrence of "chattering vibration" but since the adjusted rotation speed variation parameter is different depending on a shape or weight of a workpiece to be worked, it is necessary to adjust the rotation speed variation parameter each time the workpiece to be worked is changed, so that it is not efficient.SOLUTION: In a numerical control device comprising a function which creates numerical control information for performing working by rotating at least either a tool or a workpiece on the basis of working step data composed of a working shape and a working condition for working a workpiece having the working shape, an adjusted rotation speed variation parameter is acquired by the numerical control information creation function, recorded in the working step data and output to the numerical control information. Rotation speed variation control is performed on the tool or the workpiece to be rotated in accordance with the presence/no presence of the rotation speed variation control, a rotation speed variation amplitude and a rotation speed variation cycle in the numerical control information.

Description

  The present invention relates to a numerical control device having a function of creating numerical control information for processing by rotating a tool or a workpiece based on processing process data including a processing shape and processing conditions for processing the processing shape.

  FIG. 2 is a block diagram showing an example of a numerical control apparatus having a conventional numerical control information creation function.

  The process data input means 1 includes a machining shape (part shape) inputted by an operator and machining conditions for machining the machining shape (rotation speed, feed speed, cutting depth, tool type used for machining, tool diameter, tool Process data PRDT consisting of a protruding length, a cutting edge angle, and the like. The process data storage means 2 receives and stores the input machining shape and machining conditions from the process data input means 1. The numerical control information creation means 3 reads the process data PRDT from the process data storage means 2 and creates numerical control information NCDT for machining the designated machining shape based on the designated machining conditions based on the read process data PRDT. To do.

  On the other hand, the dialog data file input / output means 4 reads the process data PRDT from the process data storage means 2, converts the read process data PRDT into a file that can be externally input / output, and as a dialog data file, a communication line, a removable medium, etc. To the outside via the transmission medium. Here, the dialogue data file means a data file storing process data PRDT and capable of external input / output.

  The numerical control information creation means 3 first creates numerical control information NCDT based on the process data PRDT inputted from the process data input means 1, but the second and subsequent times of machining the workpiece are interactive data file input / output means 4. The numerical information control NCDT is created on the basis of the interactive data file output to the outside acquired by. Therefore, since the process data PRDT can be reproduced in the state when the dialogue data file is output to the outside, it is not necessary to input the process data PRDT again with the process data input means 1 after the second time of machining the workpiece. .

  When an interactive data file output to the outside is input, the interactive data file input / output means 4 accepts an externally input interactive data file, converts it into process data PRDT, and stores it in the process data storage means 2. The dialog data file is generally managed for each workpiece to be processed. Numerical control information NCDT is created from the dialogue data file and the target workpiece is machined. The above is the numerical control information creation function.

  The numerical control information interpreting means 5 receives the created numerical control information NCDT, interprets the numerical control information NCDT, and designates it to the rotational speed control means 6 based on a command code indicating the rotational speed included in the numerical control information NCDT. The rotational speed SDT is output. The rotational speed control means 6 performs control so that the rotational speed of the tool or workpiece becomes the rotational speed command SDT based on the designated designated rotational speed SDT.

  By the way, when the depth of cut and the protruding length of the tool are increased more than necessary, there is a problem that so-called “chatter vibration” occurs during processing, and the finishing accuracy of the processed surface is deteriorated. In order to suppress the “chatter vibration”, it is known that machining may be performed by periodically changing the rotational speed of a tool or a workpiece.

  Therefore, in order to prevent “chatter vibration” from occurring, the operator designates the presence or absence of rotational speed fluctuation control as necessary, and the rotational speed fluctuation amplitude, which is the rotational speed fluctuation amount, and the rotational speed fluctuation period, which is the rotational speed fluctuation period. , And performing the fluctuation control of the rotational speed according to the input rotational speed fluctuation amplitude and the rotational speed fluctuation period, instead of performing the processing with the original designated rotational speed SDT commanded by the numerical control information as it is, the rotational speed Processing is performed while adjusting the fluctuation amplitude and the rotation speed fluctuation period.

  For the purpose of adjusting the rotational speed fluctuation amplitude and the rotational speed fluctuation period, the numerical control apparatus has conventionally been provided with the rotational speed fluctuation parameter adjusting means 7 so that the “chatter vibration” does not occur. Is provided.

The rotation speed fluctuation parameter adjusting means 7 receives a rotation speed fluctuation parameter SFDT, which is input by an operator and includes rotation speed fluctuation presence / absence, rotation speed fluctuation amplitude Q (min ⁻¹ ), and rotation speed fluctuation period P (s). The rotational speed control means 6 reads the input rotational speed fluctuation parameter SFDT, performs fluctuation control of the rotational speed of the tool or workpiece based on the designated rotational speed SDT and the rotational speed fluctuation parameter SFDT, and performs “chatter vibration” in machining. "To prevent occurrence of"

When the rotational speed variation control is present, the rotational speed control means 6 sets the time t () based on the designated rotational speed SDT (min ⁻¹ ), the rotational speed variation amplitude Q (%), and the rotational speed variation period P (s). s), when the rotational speed is varied like a sine wave, control is performed so that the actual rotational speed S (min ⁻¹ ) of the workpiece or tool is expressed by the following equation.

  S = SDT + (SDT * Q / 100) * sin ((2 * π) / P * t)

Here, the rotational speed fluctuation amplitude Q (%) is a coefficient indicating how much rotational speed fluctuation control is performed with respect to the designated rotational speed SDT. For example, the command value rotational speed is 200 (min ⁻¹ ) When the number variation coefficient is 5%, the rotational speed is varied by ± 5% with reference to 200 (min ⁻¹ ). In other words, becomes possible to perform the change rotational speed of ± 10 ^{(min -1),} the rotational speed during engine speed fluctuation control becomes 200 ± 10 ^{(min -1).}

Further, as in the example of FIG. 3, based on the designated rotational speed SDT (min ⁻¹ ), the rotational speed fluctuation amplitude Q (%), and the rotational speed fluctuation period P (s), the actual rotational speed S ( When fluctuation control is performed so that min ⁻¹ ) becomes a triangular wave, an interval timer R (s) is further provided, the designated rotation speed SDT (min ⁻¹ ), the rotation speed fluctuation amplitude Q (%), and the rotation speed fluctuation cycle. Based on P (s) and the interval timer R (s), the rotational speed fluctuation control may be performed so that the actual rotational speed S (min ⁻¹ ) of the workpiece or tool becomes as shown in the example of FIG. Note that the horizontal axis of the graphs of FIGS. 3 and 4 is time t (s).

  In a conventional numerical control information device, for example, in the machining of workpiece A, an operator who performs machining performs trial cutting of the presence / absence of rotational speed fluctuation control, the rotational speed fluctuation amplitude, and the rotational speed fluctuation cycle so that “chatter vibration” does not occur. Is repeated to adjust to an optimum value. That is, when “chatter vibration” occurs, the rotational speed fluctuation control is set to “present”, and the workpiece A created by the numerical control information creation function is processed while appropriately changing the rotational speed fluctuation amplitude and the rotational speed fluctuation cycle. The numerical control information is repeatedly executed until “chatter vibration” does not occur. The adjusted result is effective during the machining of the workpiece A. Next, when the machining target is changed to another workpiece B, the cause of “chatter vibration” varies depending on the shape and weight of the workpiece. It is necessary for the operator who processes the presence / absence of control, the rotational speed fluctuation amplitude, and the rotational speed fluctuation cycle to repeatedly adjust the trial cutting. After that, when the workpiece A is processed again, it is necessary to similarly adjust the presence / absence of the rotational speed variation control, the rotational speed variation amplitude, and the rotational speed variation cycle.

  When creating numerical control information using the numerical control information creation function and processing, create numerical control information for machining workpiece A from the interactive data file for machining workpiece A, and use the created numerical control information. The workpiece A is processed, and the presence / absence of the rotational speed fluctuation control, the rotational speed fluctuation amplitude, and the rotational speed fluctuation cycle are adjusted during the work A machining. Next, numerical control information for machining the workpiece B is created from the interactive data file for machining the workpiece B, the workpiece B is machined using the created numeric control information, and the rotational speed fluctuation control is performed during the workpiece B machining. The presence / absence, rotation speed fluctuation amplitude, and rotation speed fluctuation cycle are adjusted.

  After that, even when the numerical control information for machining the workpiece A is created from the dialogue data file for machining the workpiece A again, and the workpiece A is machined using the created numeric control information, the number of revolutions is included in the dialogue data file. Since data on presence / absence of fluctuation control, rotation speed fluctuation amplitude, and rotation speed fluctuation cycle are not included, the presence / absence of rotation speed fluctuation control, rotation speed fluctuation amplitude, and rotation speed fluctuation cycle are adjusted again to suit the machining of workpiece A. There was a need.

  Numerical control having a function of creating numerical control information for processing a workpiece with a tool by rotating at least one of the tool and the workpiece based on machining process data including a machining shape and machining conditions for machining the machining shape. In the apparatus, parameter obtaining means for machining a workpiece by varying the number of rotations of at least one of a tool and a workpiece, obtaining a rotation number variation parameter indicating the variation in the number of rotations during the machining, and recording the parameter in the machining process data. And numerical control information creating means for creating numerical control information including a rotational speed variation parameter for varying the rotational speed of at least one of a tool and a workpiece based on machining process data including the rotational speed variation parameter, and the numerical control information The rotation speed of at least one of the tool and workpiece is fluctuated according to the rotation speed fluctuation parameter of It is achieved by having a rotation speed control unit that.

  In a preferred aspect, the rotational speed variation parameter includes presence / absence of rotational speed variation control and at least one of the rotational speed variation amplitude and the rotational speed variation period.

  In another preferred aspect, dialogue data output means for outputting machining process data including the rotation speed variation parameter as dialogue data to a dialogue data file; reading the dialogue data from the dialogue data file; and Dialogue data input means for outputting the machining process data to the numerical control information creating means.

  According to the numerical control device of the present invention, the operator who performs machining repeats trial cutting to obtain optimum values for the presence / absence of the rotational speed fluctuation control, the rotational speed fluctuation amplitude, and the rotational speed fluctuation period so that “chatter vibration” does not occur. The result of the adjustment is taken into the numerical control information creation function and can be recorded as a dialog data file. Therefore, the presence / absence of the rotational speed fluctuation control, the rotational speed fluctuation amplitude, and the rotational speed fluctuation cycle are adjusted once. For example, it is possible to easily restore the presence / absence of the rotational speed fluctuation control, the rotational speed fluctuation amplitude, and the rotational speed fluctuation period adjusted so as not to generate “chatter vibration”. This makes it possible to easily reproduce machining that does not generate chatter vibrations without the operator having to adjust the rotational speed fluctuation control, the rotational speed fluctuation amplitude, and the rotational speed fluctuation cycle each time the workpiece is changed. Processing preparation time can be shortened.

  In addition, since the dialogue data file is generally managed for each machining work, appropriate values for each machining workpiece can be obtained by including the values of the rotational speed fluctuation control, the rotational speed fluctuation amplitude, and the rotational speed fluctuation period in the interactive data file. The presence / absence of the rotational speed fluctuation control, the rotational speed fluctuation amplitude, and the rotational speed fluctuation period can be easily managed.

It is a block diagram of the numerical control apparatus by this invention. It is a block diagram of the conventional numerical control apparatus. It is the 1st explanatory view about rotation speed variation control. It is the 2nd explanatory view about rotation speed variation control. It is a figure which shows an example of the process data produced with this invention apparatus. It is a figure which shows an example of the numerical control information output with this invention apparatus. It is a flowchart which shows the operation example of the rotation speed fluctuation parameter acquisition means in this invention apparatus. It is a flowchart which shows the operation example of the numerical control information preparation means in this invention apparatus. It is a flowchart which shows the operation example of the numerical control information interpretation means in this invention apparatus.

  An embodiment of a numerical controller according to the present invention is shown in FIG. The same components as those of the conventional numerical control information generating apparatus are assigned the same numbers and the description thereof is omitted. The numerical control apparatus according to the present invention includes a rotation speed fluctuation parameter acquisition means 8 in addition to each means included in a conventional numerical control information creation apparatus.

  An operator who performs processing of the presence / absence of the rotational speed fluctuation control, the rotational speed fluctuation amplitude, and the rotational speed fluctuation cycle repeats the trial cutting so that the “chatter vibration” does not occur, and adjusts it to an optimum value. In other words, when “chatter vibration” occurs, the rotational speed fluctuation control is set to “Yes”, and the workpiece created by the numerical control information creation function is processed while appropriately changing the rotational speed fluctuation amplitude and the rotational speed fluctuation cycle. The numerical control information is repeatedly executed until “chatter vibration” does not occur.

  The rotational speed fluctuation parameter acquisition means 8 obtains the adjusted rotational speed fluctuation parameter CFDT, which is the result of this adjustment, including the presence / absence of rotational speed fluctuation control, the rotational speed fluctuation amplitude, and the rotational speed fluctuation period, as the rotational speed fluctuation parameter adjustment means 7 ′. Get from. Further, the rotation speed variation parameter acquisition unit 8 acquires the process data PRDT from the process data storage unit 2.

  The rotation speed fluctuation parameter acquisition means 8 further synthesizes the original process data PRDT acquired from the process data storage means 2 and the adjusted rotation speed fluctuation parameter CFDT acquired from the rotation speed fluctuation parameter adjustment means 7 'to obtain the original process. Process data PRDT ′ including both the data PRDT and the adjusted rotation speed variation parameter CFDT is created and stored in the process data storage means 2.

  On the other hand, the dialogue data file input / output means 4 reads out the process data PRDT ′ stored in the process data storage means 2 and converts it into a file capable of external input / output, and as a dialogue data file, a transmission medium such as a communication line or a removable medium. To the outside via. When the dialog data file output to the outside is input, the dialog data file input / output unit 4 accepts the dialog data file input from the outside, converts it into process data PRDT ′, and stores it in the process data storage unit 2. .

  For example, when machining is performed in the order of workpiece A (first time) → work B → work A (second time), in the first machining of the workpiece A, both the original process data PRDT and the adjusted rotation speed variation parameter CFDT are used. The included process data PRDT ′ is output to the outside as a dialog data file. After that, when the workpiece B is machined and the workpiece A is machined again from the workpiece B, an interactive data file for machining the workpiece A output to the outside in the first workpiece A machining is input. Thus, the process data PRDT ′ for machining the workpiece A can be reproduced in the state when the dialogue data file is output to the outside. The reproduced process data PRDT ′ includes both the original process data PRDT for machining the workpiece A and the adjusted rotational speed variation parameter CFDT so that “chatter vibration” does not occur when the workpiece A is repeatedly trial cut. Both of these are reproduced.

  The numerical control information creating means 3 'reads the process data PRDT' from the process data storage means 2, and creates numerical control information NCDT 'based on the read process data PRDT'. The numerical control information creating means 3 'outputs the created numerical control information NCDT' to the numerical control information interpreting means 5 'that interprets the numerical control information.

  The numerical control information interpreting means 5 ′ interprets the numerical control information NCDT ′, and controls the rotational speed control means 6 for controlling the rotational speed of the tool or workpiece based on the command code indicating the rotational speed included in the numerical control information NCDT ′. The designated rotation speed SDT is output to. Further, the numerical control information interpretation unit 5 'creates the adjusted rotation speed fluctuation parameter CFDT, and outputs the created adjusted rotation speed fluctuation parameter CFDT to the rotation speed fluctuation parameter adjustment means 7'.

  The rotation speed control means 6 performs fluctuation control of the rotation speed of the tool or the workpiece based on the input designated rotation speed SDT and rotation speed fluctuation parameter CFDT.

  With such a configuration, the process data PRDT 'created by the rotation speed fluctuation parameter acquisition means 8 will be described with reference to FIG. The process data PRDT ′ includes a machining shape (part shape) to be machined in a process to be machined input by the operator from the process data input means 1 and machining conditions (rotation speed, feed speed, Process data PRDT consisting of cutting depth, tool type used for machining, tool diameter, tool protruding length, cutting edge angle, etc., and presence / absence of rotational speed fluctuation control that does not generate “chatter vibration” obtained by repeated trial cutting In addition, both the adjusted rotational speed fluctuation parameter CFDT including the rotational speed fluctuation amplitude and the rotational speed fluctuation period are included. The adjusted rotation speed variation parameter CFDT includes the interval timer R (s) shown in the example of FIG. 4 or the inertia (inertia of the rotating tool or workpiece measured to determine the upper limit value of rotation acceleration / deceleration, for example. Other parameters used for rotational speed fluctuation control such as (moment) may be included.

An operation example in which the process data PRDT ′ is created by the rotation speed fluctuation parameter acquisition means 8 will be described with reference to the flowchart of FIG. The rotation speed fluctuation parameter acquisition means 8 reads the process data PRDT from the process data storage means 2 (step 1). Further, the rotational speed fluctuation parameter acquisition means 8 reads the adjusted rotational speed fluctuation parameter CFDT from the rotational speed fluctuation parameter adjustment means 7 ′ (step 2). The process data PRDT and PRDT ′ are buffers that can hold a plurality of data values, and the data value of the process data PRDT is set in each buffer of the process data PRDT ′ (step 3). In the example of FIG. 5, the starting point X = 50, Z = 103, straight line X = 50, Z = 80, straight line X = 90, Z = 80, straight line X = 100, Z = 50 as machining shapes (part shapes). , Etc., and shape elements constituting the machining shape are set. Further, as the machining conditions, the rotation speed is 200 (min ⁻¹ ), the feed rate is 0.2 (m / min), the cutting depth is 5 mm, the tool type “end mill” used for machining, the tool diameter is 10 mm, the protruding length of the tool is 40 mm, the cutting edge A corner 118 or the like is set.

  The rotational speed fluctuation parameter acquisition means 8 performs the rotational speed fluctuation control specified by the adjusted rotational speed fluctuation parameter CFDT that has been adjusted to an optimum value by repeated trial cutting by an operator who performs machining so that “chatter vibration” does not occur. It is determined whether the presence / absence is “present” or “absent” (step 4).

  When the rotational speed variation control is “present”, the rotational speed variation parameter acquisition means 8 sets the rotational speed variation control “present” in the process data PRDT ′ (step 5), and the rotational speed variation amplitude is set in the process data PRDT ′. A value is set (step 6). In the example of FIG. 5, 50 (%) is set as the rotation speed fluctuation amplitude. Subsequently, the value of the rotation speed fluctuation period is set in the process data PRDT '(step 7). In the example of FIG. 5, 10 (s) is set as the rotation speed fluctuation period. The process data PRDT 'for which the above settings have been made is stored in the process data storage means 2 (step 8), and the process is terminated. The process data CFDT includes the interval timer R (s) shown in the example of FIG. 4 and other parameters used for rotational speed fluctuation control such as the measured inertia (moment of inertia) of a rotating tool or workpiece, for example. In such a case, these may be set in the process data PRDT ′ as in Steps 7 and 8.

  When the rotational speed variation control is “none” in step 4, the rotational speed variation parameter acquisition means 8 sets the rotational speed variation control “none” in the process data PRDT ′ (step 9), and the process data PRDT ′ is processed. The data is stored in the data storage means 2 (step 8), and the process is terminated.

  Next, numerical control information NCDT 'created by the numerical control information creating means 3' will be described with reference to FIG. Based on the adjusted rotation speed fluctuation parameter CFDT included in the process data PRDT ′, the presence / absence of the rotation speed fluctuation control in the numerical control information NCDT ′ is an M code (M694: rotation speed fluctuation control “ON”, M695: rotation speed fluctuation control). As “OFF”), the rotational speed fluctuation amplitude (VFLTQ = 50) and the rotational speed fluctuation period (VFLTP = 10) are output as variables. In this example, the rotational speed fluctuation control is performed in the workpiece machining program between N0011 M694 and N0021 M695. Other parameters used for rotational speed fluctuation control such as the interval timer R (s) shown in the example of FIG. 4 and the measured inertia (moment of inertia) of a rotating tool or workpiece, for example, are also used as numerical control information. What is necessary is just to output to NCDT '.

  An operation example in which the numerical control information NCDT 'is generated by the numerical control information generating means 3' will be described with reference to the flowchart of FIG. The numerical control information creation means 3 'reads the process data PRDT' from the process data storage means 2 (step 11). Further, the numerical control information creating means 3 'determines whether the rotational speed variation control of the process data PRDT' is "present" or "not present" (step 12).

  When the rotational speed fluctuation control is “present”, the numerical control information creation means 3 ′ sets the rotational speed fluctuation amplitude in the variable VFLTQ and outputs it (step 13). Next, the rotation speed fluctuation period is set to a variable VFLTP and output (step 14). It should be noted that other parameters used for rotational speed fluctuation control such as the interval timer R (s) shown in the example of FIG. 4 and the measured inertia (moment of inertia) of the rotating tool or workpiece are included in the process data PRDT ′. If they are included, values may be set for the variables in the same manner as in Steps 13 and 14, and the value of the interval timer R (s) may be output to the numerical control information NCDT 'such as VFLTR = 1. . Next, a command code M694 for setting the rotational speed variation control to “ON” is output (step 15). Next, from the processing shape (part shape) of the process data PRDT ', processing conditions (rotation speed, feed speed, depth of cut, tool type used for processing, tool diameter, tool protruding length, cutting edge angle, etc.) A program is generated and output (step 16). Next, a command code M695 for setting the rotational speed fluctuation control to “OFF” is output, and the process is terminated (step 17).

  When the rotational speed variation control is “None” in the step 12, the numerical control information creating means 3 ′ uses the machining shape (part shape) and machining conditions (rotation speed, feed speed, cutting depth, machining) of the process data PRDT ′. Based on the tool type, tool diameter, tool protrusion length, cutting edge angle, etc. used, a workpiece machining program is generated and output, and the process is terminated (step 18).

  Next, an operation example in which the adjusted rotational speed variation parameter CFDT is created by the numerical control information interpretation unit 5 'will be described with reference to the flowchart of FIG.

  The numerical control information interpreting means 5 'reads one line of numerical control information NCDT' output from the numerical control information creating means 3 '(step 21). When the value is set in the variable VFLTQ, the numerical control information interpreting means 5 'sets the set value of the variable VFLTQ as the rotation speed fluctuation amplitude in the adjusted rotation speed fluctuation parameter CFDT (step 22). When a value is set in the variable VFLTP, the set value of the variable VFLTP is set in the adjusted rotation speed fluctuation parameter CFDT as the rotation speed fluctuation cycle (step 23). The other parameters used for the rotational speed fluctuation control such as the interval timer R (s) shown in the example of FIG. 4 and the measured inertia (moment of inertia) of the rotating tool or workpiece, for example, are the numerical control information NCDT ′. Are included in the adjusted rotational speed fluctuation parameter CFDT as in Steps 22 and 23.

  Subsequently, the numerical control information interpreting means 5 'determines whether or not there is a rotational speed fluctuation control "ON" command code M694 (step 24).

  When the rotational speed fluctuation control “ON” command code M694 is present, the numerical control information interpretation unit 5 ′ sets the rotational speed fluctuation control “present” to the adjusted rotational speed fluctuation parameter CFDT, and sets the adjusted rotational speed fluctuation parameter CFDT. Output to the rotational speed fluctuation parameter adjusting means 7 '(step 25). If the rotational speed variation control “ON” command code M694 is not present, the routine proceeds to step 26.

  Next, the numerical control information interpreting means 5 'determines whether or not there is the rotation speed fluctuation control "OFF" command code M695 (step 26). When the rotational speed fluctuation control “off” command code M695 is present, the numerical control information interpreting means 5 ′ sets the rotational speed fluctuation control “none” to CFDT and sets the adjusted rotational speed fluctuation parameter CFDT to the rotational speed fluctuation parameter adjusting means. 7 '(step 27). If there is no rotation speed variation control “OFF” command code M695, the routine proceeds to step 28.

  Next, the numerical control information interpretation unit 5 ′ determines whether the read numerical control information NCDT ′ of one line is the last line (step 28). If it is the last line, the process is terminated. Return to.

  1 process data input means, 2 process data storage means, 3, 3 'numerical control information creation means, 4 dialogue data file input / output means, 5, 5' numerical control information interpretation means, 6 rotation speed control means, 7, 7 ' Rotational speed fluctuation parameter adjustment means, 8 Rotational speed fluctuation parameter acquisition means.

Claims (3)

Numerical control having a function of creating numerical control information for processing a workpiece with a tool by rotating at least one of the tool and the workpiece based on machining process data including a machining shape and machining conditions for machining the machining shape. In the device
Parameter obtaining means for machining a workpiece by varying the number of revolutions of at least one of a tool and a workpiece, obtaining a revolution number fluctuation parameter indicating fluctuations in the number of revolutions at the time of the machining, and recording it in the machining process data;
Numerical control information creating means for creating numerical control information including a rotational speed variation parameter for varying the rotational speed of at least one of the tool and the workpiece based on the machining process data including the rotational speed variation parameter;
A rotational speed control means for varying the rotational speed of at least one of the tool and the workpiece according to the rotational speed variation parameter of the numerical control information;
A numerical control apparatus having a numerical control information creation function, characterized by comprising:   The numerical control information creation function according to claim 1, wherein the rotation speed fluctuation parameter includes presence / absence of rotation speed fluctuation control and at least one of a rotation speed fluctuation amplitude and a rotation speed fluctuation cycle. Numerical control unit. Dialog data output means for outputting machining process data including the rotation speed variation parameter as a dialog data file;
Dialogue data input means for reading the dialogue data from the dialogue data file and outputting machining process data including the rotation speed variation parameter to the numerical control information creating means;
The numerical control apparatus having a numerical control information creation function according to claim 1 or 2, characterized by comprising:

Images