JP5647529B2 - Numerical control information creation device - Google Patents

Description

  The present invention relates to a numerical control information creation device for a processing machine provided with a transmission mechanism for a spindle.

  FIG. 7 shows a conventional numerical control information creation device 200. In creating the numerical control information, in the conventional apparatus 200, the data input unit 2 receives the machining shape (part shape) PF and the material shape MF input by the external data input device 1 as the machining shape storage unit 5 and the material shape storage unit. 3 respectively. Further, the data input unit 2 stores tool data DT including a tool type, a cutting edge angle, a cutting edge angle, a tool length, and the like in the tool data storage unit 4.

  The machining process information creation unit 6 inputs the material shape MF, the machining shape PF, and the tool data DT, extracts a cutting area from the difference between the material shape MF and the machining shape PF, and creates a plurality of cutting areas based on the tool data DT. The machining process information MP necessary for finishing the material shape MF into the machining shape PF is created by dividing the material shape MF and calculating different cutting areas for each tool. The cutting condition determination unit 7 sequentially reads the created machining process information MP, determines the cutting condition MC for each, and stores it in the process data storage unit 8.

  In the case of constant peripheral speed cutting in which the main spindle rotates at a constant peripheral speed, the main spindle rotational speed calculation unit 10 determines the cutting conditions MC such as the maximum and minimum processing diameters and cutting speeds included in the machining process information MP, The spindle rotation speed Sn (maximum and minimum rotation speed) for each machining process is calculated. In the case of constant rotation cutting in which the main shaft is driven at a constant rotational speed, the rotational speed included in the cutting condition MC is obtained as the main spindle rotational speed Sn.

  On the other hand, the data input unit 2 stores the power diagram data PO unique to the machine, such as the rated output of the spindle motor and the gear range, input by the data input device 1 in the power diagram data storage unit 9. The power diagram data storage unit 9 provides the power diagram data PO to the main shaft gear determination unit 11, and the main shaft gear determination unit 11 determines the main shaft gear for each machining process based on the power diagram data and the main shaft rotation speed Sn. The determined gear information SG is stored in the process data storage unit 8.

  The numerical control information creation unit 12 inputs the material shape MF from the material shape storage unit 3 and reads the process data DM including the machining process information MP, the cutting conditions MC, the gear information SG, and the like from the process data storage unit 8. Create control information NC. The created numerical control information NC is output from the numerical control information output unit 13 to the outside via a transmission medium 14 such as a communication line or a removable medium.

  FIG. 8 shows a method of determining the main shaft gear in the conventional apparatus 200. First, machining process information MP and cutting conditions MC are generated (S51). For example, as shown in FIG. 3, a cutting region is extracted from the difference between the material shape MF and the machining shape PF, and “end surface roughing” is determined as a turning method from the shape, and interference based on the tool data DT. When the presence or absence is confirmed and machining can be performed without interference, one machining process information MP including the entire cutting region is generated, and the cutting condition MC is determined together.

  Next, it is confirmed whether the cutting region is processed by constant rotation cutting or constant peripheral speed cutting (S52). In the case of turning, constant circumferential cutting is often used in which machining is performed with a constant spindle cutting speed. In the case of constant circumferential speed cutting, the maximum spindle speed and the minimum spindle speed at the time of machining the target process are calculated (S53). Subsequently, the main shaft gear is determined from the range of the main shaft rotation speed and the power diagram data (S54).

  In general, when the end surface portion of a workpiece having a large machining diameter is machined by constant circumferential speed cutting, for example, in the cutting region shown in FIG. 3, the maximum machining diameter Dmax of the outermost diameter portion of the material shape MF and the minimum diameter portion of the material shape MF. When the processing machine used for cutting is equipped with a speed change mechanism, the difference between the minimum machining diameter Dmin and the difference between the maximum spindle speed and the minimum spindle speed during machining increases. It is important to select the main shaft gear.

  In this regard, Patent Document 1 determines whether to use a low-speed range or a high-speed range based on the required spindle speed in an NC lathe equipped with a high and low two-stage transmission, and a gear range (speed range). A method has been proposed. Patent Document 2 discloses a technique for selecting a gear range to be used based on machining process information of a workpiece in an NC lathe equipped with a multi-stage transmission. Patent Document 3 describes an automatic programming device that divides a cutting region by setting a material diameter that becomes a boundary for switching between a low speed / high speed range of the spindle rotation speed.

JP 59-1136 A Japanese Patent Publication No.62-36824 Japanese Utility Model Publication No. 62-72044

  By the way, in the conventional numerical control information creation device 200, in a processing machine having a plurality of main shaft gears, the operator selects the main shaft gear based on a power diagram showing the relationship between the main shaft rotation speed and the motor output value. However, in the case of constant peripheral speed cutting, if low speed gears are selected by focusing on a part with a large machining diameter, the spindle speed reaches the upper limit and the cutting efficiency decreases at the part where the machining diameter has become smaller due to machining. Sometimes. Conversely, when a high-speed gear is selected, the power required for cutting exceeds the output value of the spindle motor at the location where the machining diameter increases, and machining may not be possible.

  Moreover, even if it was going to change cutting conditions (cutting speed, feed, cutting depth), numerical control information had to be created in consideration of both gear and machining shape, which was difficult for machining beginners. . Patent Document 3 suggests a technique for dividing a cutting region, but does not mention how to set a boundary for switching between a high speed / low speed range in which part of the material shape. Therefore, according to the prior art, there is a problem that it becomes more difficult to create numerical control information as the material shape and the processed shape become more complicated.

  SUMMARY OF THE INVENTION An object of the present invention is to provide an apparatus capable of easily creating numerical control information adapted to the capability of a processing machine even for beginners of processing.

  In order to solve the above-mentioned problems, the present invention provides the following numerical control information generating device in a processing machine having a spindle having a plurality of different output characteristics by a speed change mechanism based on a material shape and a processing shape.

(1) Power diagram data storage means for storing a plurality of power diagram data representing output characteristics according to the spindle rotational speed and the output value of the spindle motor, and a cutting area to be machined by a predetermined tool based on the material shape and the machining shape Machining process information creating means for generating cutting conditions, required power calculating means for calculating the required power when machining with a predetermined tool based on the cutting conditions, and when machining with a predetermined tool based on the cutting area and cutting conditions A spindle rotational speed calculation means for calculating the rotational speed fluctuation range of the main spindle, and power related data display means for displaying a plurality of power diagram data, required power, and the rotational speed fluctuation width of the spindle on the same screen. An apparatus for creating numerical control information characterized by

(2) Power diagram data storage means for storing a plurality of power diagram data representing output characteristics according to the spindle rotational speed and the output value of the spindle motor, and a cutting area to be machined by a predetermined tool based on the material shape and the machining shape Machining process information creating means for generating cutting conditions, required power calculating means for calculating the required power when machining with a predetermined tool based on the cutting conditions, and when machining with a predetermined tool based on the cutting area and cutting conditions When the main shaft rotation speed calculation means for calculating the main shaft rotation speed fluctuation range and the main shaft rotation speed fluctuation width spans a plurality of different output characteristics, the main shaft rotation speed range in which the required power can be obtained in any output characteristics is calculated. A spindle speed range calculating means, a process point dividing means for calculating a switching point for switching output characteristics based on the spindle speed range and the cutting area, and dividing the cutting area by the switching point; Numerical control information generating apparatus being characterized in that a numerical control information generation means for generating machining information based on the divided cutting region.

(3) Power diagram data storage means for storing a plurality of power diagram data representing output characteristics by the spindle rotational speed and the output value of the spindle motor, and a cutting region to be machined by a predetermined tool based on the material shape and the machining shape Machining process information creating means for generating cutting conditions, required power calculating means for calculating the required power when machining with a predetermined tool based on the cutting conditions, and when machining with a predetermined tool based on the cutting area and cutting conditions If the spindle speed calculation means for calculating the spindle speed fluctuation range and the spindle speed fluctuation width spans multiple different output characteristics, calculate the upper limit output value of the spindle motor for any output characteristic, and set the upper limit output. The cutting condition changing means for changing the cutting conditions so as not to exceed the value and the numerical control information creating means for creating machining information based on the changed cutting conditions are provided. Numerical control information generating apparatus for the.

  According to the numerical control information creation device of the present invention, since the output of the speed change mechanism is determined based on power diagram data, power related data including the required power of the main shaft and the fluctuation range of the main shaft rotation speed, it is not familiar with machining. There is an effect that the operator can easily create numerical control information suitable for the capability of the processing machine. In particular, the power related data display means displays the required power of the main shaft and the fluctuation range of the main shaft rotation speed on the power diagram data, so that the operator can visually determine whether the output of the speed change mechanism is appropriate. is there.

It is a block diagram of the numerical control information creation device showing an embodiment of the present invention. It is a flowchart which shows the characteristic process of a numerical control information creation apparatus. It is a process model figure which shows an end surface roughing process. It is a process model figure which shows an end surface roughing division | segmentation process. It is a display model figure of the power related data display part which shows processing process division processing. It is a display model figure of the power related data display part which shows cutting condition change processing. It is a block diagram which shows the conventional numerical control information preparation apparatus. It is a flowchart which shows the process by the conventional apparatus.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. As shown in FIG. 1, the numerical control information creating apparatus 100 of this embodiment includes a cutting condition changing unit 15, a machining process dividing unit 16, and a required power calculating unit 17 in addition to the components of the conventional apparatus 200 (see FIG. 7). , A spindle rotation speed range calculation unit 18 and a power related data display unit 19 are provided. Components that function in the same manner as the conventional device 200 are denoted by the same reference numerals as those in FIG.

  The power diagram data storage unit 9 stores a plurality of power diagram data PO indicating the relationship between the spindle rotational speed and the output value of the spindle motor, and provides it to the spindle rotational speed range calculation unit 18. Based on the machining process information MP read from the process data storage unit 8 and the cutting conditions MC, the main spindle speed calculation unit 10 calculates the main spindle maximum speed Smax and the main spindle minimum speed Smin during the target process machining. The value is provided to the spindle speed range calculation unit 18. For example, if the target process is rough edge machining for constant peripheral speed cutting, the spindle is determined from the machining shape included in the machining process information MP and the minimum machining diameter acquired from the material shape, and the spindle cutting speed contained in the cutting condition MC. The maximum rotation speed Smax is calculated, and the spindle minimum rotation speed Smin is calculated from the maximum machining diameter acquired from the machining process information MP and the spindle cutting speed included in the cutting condition MC. If the target process is constant rotation cutting, the rotation speed included in the cutting condition MC is the spindle rotation speed. In this case, the maximum spindle speed Smax and the minimum spindle speed Smin are equal to the rotational speed included in the cutting condition MC.

  The required power calculation unit 17 calculates the required power PN for machining the target process based on the machining process information MP and the cutting condition MC read from the process data storage unit 8, and calculates the calculated value of the spindle speed range. Stored in the unit 18. Then, the spindle speed range calculation unit 18 provides the power-related data display unit 19 with data including the power diagram data PO, the required power PN, and the spindle speeds Smax and Smin, and the display unit 19 displays the low speed gear on the same screen. The power diagram PL and the high-speed gear power diagram PH (see FIGS. 3 and 4) are superimposed and displayed. In the spindle speed range calculation unit 18, the fluctuation range of the spindle speed, which is the difference between the required power PN and the maximum spindle speed Smax and the minimum spindle speed Smin, is converted into a plurality of power diagram data PO (output characteristics). Determine whether to straddle. Further, when the fluctuation range of the spindle rotational speed extends over a plurality of output characteristics, the spindle rotational speed range calculation unit 18 can obtain the required power PN necessary for processing the target process in any output characteristics. It is determined whether or not the range of the spindle speed that can be obtained can be obtained by dividing the machining process or changing the cutting conditions.

  The power diagram data PO, the required power PN, the minimum spindle speed Smin, and the maximum spindle speed Smax are also provided from the spindle speed range calculation unit 18 to the spindle gear determination unit 11. The main shaft gear determination unit 11 functions as an output determination unit that determines the output of the main shaft transmission mechanism, and the main shaft gear determination unit 11 determines the main shaft gear by automatic selection based on power-related data or manual selection by an operator. In the case of manual selection, the selection condition MG designated by the data input unit 2 is provided to the main shaft gear determination unit 11. When the fluctuation range of the main shaft rotational speed does not extend over a plurality of power diagram data PO and the main shaft gear is uniquely determined, the gear information SG is stored in the process data storage unit 8.

  On the other hand, when the fluctuation range of the spindle rotational speed extends over a plurality of power diagram data PO, the spindle rotational speed range calculating unit 18 determines that the necessary power is obtained by a method of dividing the machining process, and one machining process is performed. When a plurality of gear ranges are required for processing, the main shaft gear determination unit 11 determines a split diameter PD (see FIG. 4) that specifies the boundary of each gear range. The machining process division unit 16 reads the machining process read from the process data storage unit 8 using the division diameter PD and the gear information SG input from the spindle gear determination unit 11 so that the machining process has a one-to-one correspondence with the gear range. (Cutting area) is divided, and the divided machining process information MPA and the corresponding gear information SG are stored in the process data storage unit 8.

  In addition, when the fluctuation range of the spindle rotation speed extends over a plurality of power diagram data PO, it is advantageous that the spindle rotation speed range calculation unit 18 obtains necessary power by a method of changing cutting conditions rather than dividing the machining process. Is determined, the cutting condition changing unit 15 exceeds the upper limit Po of the motor output value acquired from the power diagram data PO of the gear information SG determined by the main shaft gear determining unit 11 and the main shaft rotation speeds Smin, Smax. Then, the feed speed and the cutting depth of the cutting condition MC are recalculated, and the newly calculated cutting condition MCA is stored in the process data storage unit 8 together with the gear information SG. Then, the numerical control information creating unit 12 creates the numerical control information NC by integrating the process data DM including the material shape MF, the machining process information MPA, the cutting condition MCA, the gear information SG, and the like.

FIG. 2 shows a characteristic process of the numerical control information creating apparatus 100 having the above configuration. First, a cutting area is extracted from the difference between the machining shape (part shape) PF and the material shape MF, and machining process information MP and a cutting condition MC for machining the cutting area are generated using the tool data DT (S1). Subsequently, the spindle cutting speed V, the feed speed F, the cutting depth T, and the specific cutting resistance K corresponding to the material of the workpiece are read from the cutting conditions MC corresponding to the machining process information MP, and the required power Pn for each process is expressed by the following equation. (S2).
Required power Pn = Spindle cutting speed V × Specific cutting resistance K × Cutting amount T × Feeding speed F

Next, it is determined based on the cutting condition MC whether it is constant rotation cutting or constant circumferential speed cutting (S3). In the case of constant rotation cutting in which the spindle speed is commanded, a numerical value as the command value is obtained as the spindle speed. In the case of constant circumferential speed cutting in which the spindle cutting speed is commanded, the maximum and minimum rotation speeds of the spindle required for machining in the cutting area are calculated (S4). For example, in FIG. 3, the spindle speed at the minimum machining diameter Dmin of the material shape MF is the maximum spindle speed Smax, and the spindle speed at the maximum machining diameter Dmax of the material shape MF is the minimum spindle speed Smin. It is done.
Maximum spindle speed Smax = Spindle cutting speed V ÷ (π × Minimum machining diameter Dmin)
Spindle minimum rotation speed Smin = Spindle cutting speed V ÷ (π × Maximum machining diameter Dmax)

  Subsequently, power related data including power diagram data PO for each main shaft gear, required power Pn of the main shaft, and fluctuation range (Smin to Smax) of the main shaft rotation speed is created (S5). It is displayed so as to overlap the screen (S6). FIG. 5 shows a display example of power-related data of a processing machine equipped with a high and low two-stage spindle transmission mechanism, and a low-speed gear power diagram PL and a high-speed gear power diagram PH are superimposed and displayed. The required power Pn of the main shaft and the fluctuation range (Smin to Smax) of the main shaft rotation speed are superimposed on the diagrams PL and PH.

  Here, the low-speed gear power diagram PL shows the effective rotational speed of the low-speed gear in the range from the minimum rotational speed SLmin to the maximum rotational speed SLmax. The high-speed gear power diagram PH shows the effective rotational speed of the high-speed gear in the range from the minimum rotational speed SHmin to the maximum rotational speed SHmax. Then, the fluctuation range (Smin to Smax) of the spindle rotational speed obtained by calculation and the required power Pn of the spindle are displayed in association with the power diagrams PL and PH which are machine specification values in a state where they overlap each other.

  Therefore, the operator can visually recognize which spindle gear to select based on the screen display of the power related data display unit 19. For example, in FIG. 5, when the line segment L indicating the fluctuation range of the main shaft rotational speed is included in either the low speed range indicated by the low speed gear power diagram PL or the high speed range indicated by the high speed gear power diagram PH, One of the main shaft gears is uniquely determined. However, it can be seen that when the line segment L extends over both the low speed range and the high speed range, machining cannot be efficiently performed with only one main shaft gear.

  The numerical control information creation device 100 according to this embodiment has a display that supports the selection of the main shaft gear by the operator, and in addition to automatically selecting the main shaft gear, the main shaft rotation speed extends over both the low speed range and the high speed range. It is determined whether it fluctuates (S7). Specifically, in the spindle speed range calculation unit 18, power-related data including power diagram data PO, required power Pn, and spindle speed fluctuation range (Smin to Smax) is used to indicate the fluctuation range of the main spindle speed. It is determined whether or not the line segment L intersects with the high speed gear power diagram PH.

  Then, when the fluctuation range of the spindle rotation speed extends over both the low speed range and the high speed range, it is confirmed which of the processing for changing the cutting conditions and the processing for dividing the machining step is prioritized (S8). . When the machining process is divided (S8: No), a division diameter PD indicating which part of the machining shape is to be divided is obtained (S9). The split diameter PD is a range that spans both the low speed range and the high speed range of the fluctuation range of the main shaft rotation speed, that is, the required power Pn of the main shaft exceeds the output value of the main shaft motor even if the main shaft gear switches from low speed to high speed. It can be preferably obtained within a non-existent range, that is, a machining shape range corresponding to the spindle rotational speed in the range CE shown in FIG.

Specifically, the minimum value Dce min of the candidate division diameter corresponding to the maximum rotation speed Sce max of the range CE and the maximum value Dce max of the candidate division diameter corresponding to the minimum rotation speed Sce min of the range CE are expressed by the following equations. The division diameter PD can be obtained for the machining shape between the minimum value Dmin and the maximum value Dmax.
Minimum value of division candidate diameter Dce min = Spindle cutting speed V ÷ (π × Maximum rotation speed Sce max)
Maximum value of division candidate diameter Dce max = spindle cutting speed V ÷ (π × minimum rotation speed Sce min)

  However, as in “end surface roughing” shown in FIG. 3, the processed shape may be composed of only linear elements or may include an arc. If the division diameter PD is set in the middle of an arc or a straight line element, there is a possibility that the finish of the machined surface will be adversely affected. For this reason, it is desirable to set the division diameter PD at the intersection or end point of the processed shape. In the example of FIG. 4, the X coordinate of the intersection of two straight lines is obtained as the division diameter PD. Of course, it is also possible to set the division diameter PD at a portion corresponding to an arbitrary spindle speed included in the range CE.

  Next, as shown in FIG. 4, a target machining process (cutting region) is divided by drawing a horizontal line from the intersection of the machining shape PF designated as the division diameter PD (S10). Then, an appropriate spindle gear is assigned to each of the plurality of divided machining steps (S11). FIG. 4 shows “end surface roughing division processing” in which the cutting region shown in FIG. 3 is divided into a cutting region A and a cutting region B by a divided diameter PD.

  On the other hand, as shown in FIG. 6, when the line segment L indicating the fluctuation range of the spindle rotational speed slightly exceeds the high-speed gear power diagram PH, the cutting conditions are changed rather than dividing the machining process. May be processed efficiently (S8: Yes). In this case, first, the main shaft gear to be used in most of the machining steps is selected from the two main and lower main shaft gears, and the power diagram data is read (S12). Next, a motor output value Po corresponding to the minimum spindle speed (Smin) is obtained from the high-speed gear power diagram PH as an upper limit output value of the spindle motor, and the cutting condition MC is set so as not to exceed the output value Po. Change (S13).

As the cutting condition MC, for example, the feed rate F of the tool can be changed. The changed feed speed F ′ is obtained from the following equation.
Feed speed after change F ′ = Po ÷ (Spindle cutting speed V × Specific cutting resistance K × Cutting amount T)
Further, the cutting amount T can be changed as the cutting condition MC. The cutting depth T ′ after the change is obtained from the following equation.
Cutting depth after change T ′ = Po ÷ (Spindle cutting speed V × Specific cutting resistance K × Feed rate F)

  As described above in detail, according to the numerical control information creation device 100 of this embodiment, when the spindle speed fluctuates across both the low speed range and the high speed range, a method of dealing with the division of the machining process, Two methods of dealing with changes in cutting conditions can be adopted. The former method divides the machining process into the required number according to the capability of the machining machine, especially in the case of a machining shape with a large difference between the maximum machining diameter Dmax and the minimum machining diameter Dmin, and the optimum spindle gear for each process. There is an advantage that can be selected.

  In the latter method, since the main shaft gear is selected in advance, the cutting conditions can be automatically changed based on the power diagram of the selected main shaft gear so as not to exceed the capacity of the processing machine. In the case of a machining shape with a small difference, there is an advantage that machining can be performed efficiently. Furthermore, in any case, since multiple types of power-related data are displayed on the same screen of the display unit 19, even an inexperienced operator can easily select the optimum spindle gear. .

  In the above embodiment, a two-speed transmission mechanism using a low-speed gear and a high-speed gear has been exemplified. However, a transmission gear mechanism having three or more speeds of low speed, medium speed, and high speed can also be adopted. There is no limitation, and a transmission mechanism that can switch the windings of the spindle motor can also be adopted. Furthermore, a composite transmission mechanism that can switch both the gear and the windings can also be adopted. In addition, the present invention is not limited to the above-described embodiment, and can be implemented by appropriately changing the configuration and procedure of each part without departing from the spirit of the invention.

DESCRIPTION OF SYMBOLS 1 Data input device 2 Data input part 3 Material shape storage part 4 Tool data storage part 5 Machining shape storage part 6 Machining process information creation part 7 Cutting condition determination part 8 Process data storage part 9 Power diagram data storage part 10 Spindle speed Calculation unit 11 Spindle gear determination unit 12 Numerical control information creation unit 13 Numerical control information output unit 14 Transmission medium 15 Cutting condition change unit 16 Machining process division unit 17 Required power calculation unit 18 Spindle speed range calculation unit 19 Power related data display unit

Claims (3)

In the numerical control information creation device that creates numerical control information of a processing machine having a plurality of different output characteristics of the main shaft by the speed change mechanism based on the material shape and the machining shape
Power diagram data storage means for storing a plurality of power diagram data representing the output characteristics according to the spindle rotation speed and the output value of the spindle motor;
Based on the material shape and the machining shape, machining process information creating means for creating a cutting region and cutting conditions to be machined by a predetermined tool,
Based on the cutting conditions, required power calculating means for calculating required power when machining with the predetermined tool;
Based on the cutting area and cutting conditions, a spindle rotation speed calculation means for calculating a rotation speed fluctuation range of the spindle when machining with the predetermined tool;
A numerical control information creating apparatus comprising: power related data display means for displaying the plurality of power diagram data, the required power, and the rotational speed fluctuation range of the main shaft on the same screen. In the numerical control information creation device that creates numerical control information of a processing machine having a plurality of different output characteristics of the main shaft by the speed change mechanism based on the material shape and the machining shape
Power diagram data storage means for storing a plurality of power diagram data representing the output characteristics according to the spindle rotation speed and the output value of the spindle motor;
Based on the material shape and the machining shape, machining process information creating means for creating a cutting region and cutting conditions to be machined by a predetermined tool,
Based on the cutting conditions, required power calculating means for calculating required power when machining with the predetermined tool;
Based on the cutting area and cutting conditions, a spindle rotation speed calculation means for calculating a rotation speed fluctuation range of the spindle when machining with the predetermined tool;
When the rotational speed fluctuation range of the main spindle extends over a plurality of different output characteristics, the main spindle speed range calculating means for calculating the main spindle speed range in which the required power can be obtained in any output characteristics;
A process step dividing means for calculating a switching point for switching output characteristics based on the spindle rotational speed range and the cutting area, and dividing the cutting area by the switching point;
A numerical control information creating apparatus comprising: numerical control information creating means for creating machining information based on the divided cutting regions. In the numerical control information creation device that creates numerical control information of a processing machine having a plurality of different output characteristics of the main shaft by the speed change mechanism based on the material shape and the machining shape
Power diagram data storage means for storing a plurality of power diagram data representing the output characteristics according to the spindle rotation speed and the output value of the spindle motor;
Based on the material shape and the machining shape, machining process information creating means for creating a cutting region and cutting conditions to be machined by a predetermined tool,
Based on the cutting conditions, required power calculating means for calculating required power when machining with the predetermined tool;
Based on the cutting area and cutting conditions, a spindle rotation speed calculation means for calculating a rotation speed fluctuation range of the spindle when machining with the predetermined tool;
When the rotation speed fluctuation range of the main spindle extends over a plurality of different output characteristics, the upper limit output value of the main spindle motor is calculated from the power diagram data representing the output characteristics on the high speed side and the minimum rotation speed in the main spindle rotation speed fluctuation range. Cutting condition changing means for changing the cutting condition so that the required power calculated based on the cutting condition does not exceed the upper limit output value;
A numerical control information creating apparatus comprising: numerical control information creating means for creating machining information based on the changed cutting conditions.

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