DE102017110939A1 - Machine tool control device, machine tool control method and machine tool control system - Google Patents

Abstract

A machining instruction divider (24) of a CNC machine tool control device (20) has an operation command setting part 26 and a cutting command setting part 27. The operation command setting part 26 sets the feed speed (F **) and the main axis rotational speed (S **) of a second divided machining command (P2) according to the cutting load during the control according to at least one first divided machining command (P1). The operation command setting part (27) sets the sum of addition of the target coordinates (G1X0.1) of the first divided machining command (P1) with the product of multiplication of the feed speed (F **) of the second divided machining command (P2) set by the operation command setting part (26 ) is set at a predetermined time interval (T2) as the target coordinates (G1X0.2) of the second divided machining command (P2).

Description

BACKGROUND OF THE INVENTION

Field of the invention

The present invention relates to a machine tool control apparatus, a machine tool control method, and a machine tool control system. Description of the Related Art

There are known devices for controlling a computerized numerical control machine tool (hereinafter referred to as a machine tool control device) that controls a cutting tool used to machine a work material into the desired shape according to an NC (numerical control) program.

Patent Literature 1 proposes a control in which the machining conditions when machining a work material are automatically changed according to an NC program according to the average cutting load in a predetermined time interval (hereinafter referred to as "adaptive control").

CITATION LIST

Patent Literature

• Patent Literature 1: Japanese Laid-Open Patent Application H4-138504

SUMMARY OF THE INVENTION

PROBLEM TO BE SOLVED BY THE INVENTION

 However, the method in Patent Literature 1 requires that a control device for executing an adaptive control (such as an override control device) be provided separately for a machine tool control device.

The present invention has been made in view of the above situation, and its object is to provide a machine tool control apparatus, a machine tool control method, and a machine tool control system with which adaptive control can be easily performed.

MEDIUM TO SOLVE THE PROBLEM

 The machine tool control apparatus relating to a first mode of the present invention comprises a cutting load detector which detects the cutting load applied to the cutting tool, a machining command divider which inputs a machining command to be split included in the NC program into a predetermined time interval A plurality of divided machining commands, and a controller that controls the cutting tool based on the plurality of divided machining commands. The plurality of divided machining commands include a first divided machining command and a second divided machining command each including target coordinates, a feed speed, and a main axis rotational speed. The machining instruction divider has an operation command setting part and a cutting command setting part. The operation command setting part sets the feed speed and the main axis speed of the second divided machining command according to the cutting load during the control according to at least the first divided machining command. The operation command setting part sets the sum of the addition of the target coordinates of the first divided machining command with the product of the multiplication of the feed speed of the second divided machining command set by the operation command setting part with the predetermined time interval as the command coordinates of the second divided machining command.

With the machine tool control apparatus relating to the first mode of the present invention, the feed speed and the major axis rotational speed in the next machining period can be set based on the cutting load on the cutting tool during a given machining period, and the target coordinates in the next machining period can be calculated based on the so forth set feed rate. Therefore, an adaptive control in which the machining conditions are automatically changed can be easily performed by appropriately changing the NC program based on the cutting load.

The machine tool control apparatus relating to a second mode of the present invention relates to the first mode, wherein the operation command setting part sets the feed speed of the second divided machining command higher than the feed speed of the first divided machining command when the cutting load during the control according to the first divided machining command is lower than one Target load is. In addition, the operation command setting part sets the feeding speed of the second divided machining command lower than the feeding speed of the first split machining command Processing command when the cutting load during the control according to the first divided machining command is higher than the target load.

 With the machine tool control apparatus relating to the second mode of the present invention, the cutting load of the cutting tool can be efficiently approximated to the target load, so that the accuracy of the adaptive control can be improved.

The machine tool control apparatus relating to a third mode of the present invention relates to the first or second kind, wherein the operation command setting part sets the feeding direction concerning the second divided machining command to be opposite to the feeding direction concerning the first divided machining command the cutting load during the control according to the first divided machining command is at or above a predetermined threshold that is above the target load.

With the machine tool control apparatus relating to the third mode of the present invention, a cutting tool 14 be traced back quickly, which allows any excess load to be quickly eliminated, which is on the cutting tool 14 is exercised.

The machine tool control method relating to a fourth mode of the present invention comprises the steps of setting the feed speed and the main axis rotational speed of the second divided machining command following the first divided machining command according to the cutting load during the control according to at least the first divided machining command, and the adjusting the sum of the addition of the target coordinates of the first divided machining command to the product of the multiplication of the feeding speed of the second divided machining command with the time interval of the second divided machining command as the target coordinates of the second divided machining command.

 With the machine tool control method concerning the fourth mode of the present invention, the feed speed and the main axis rotational speed in the next machining period can be set based on the cutting load on the cutting tool during a given machining period, and the target coordinates in the next machining period can be calculated based on the so forth set feed rate. Therefore, an adaptive control in which the machining conditions are automatically changed can be easily performed by appropriately changing the NC program based on the cutting load.

The machine tool control system relating to a fifth mode of the present invention comprises a cutting load detector which detects the cutting load applied to the cutting tool, a machining command divider which inputs a machining command to be split included in the NC program into a predetermined time interval A plurality of divided machining commands, and a controller that controls the cutting tool based on the plurality of divided machining commands. The plurality of divided machining commands include a first divided machining command and a second divided machining command each including target coordinates, a feed speed, and a main axis rotational speed. The machining instruction divider has an operation command setting part and a cutting command setting part. The operation command setting part sets the feed speed and the main axis speed of the second divided machining command according to the cutting load during the control according to at least the first divided machining command. The operation command setting part sets the sum of the addition of the target coordinates of the first divided machining command to the product of the multiplication of the feed speed of the second divided machining command set by the operation command setting part with the predetermined time interval as the command coordinates of the second divided machining command.

With the machine tool control system concerning the fifth mode of the present invention, the feed speed and the major axis rotational speed in the next machining period can be set based on the cutting load on the cutting tool during a given machining period, and the target coordinates in the next machining period can be calculated based on the so set feed rate. Therefore, an adaptive control in which the machining conditions are automatically changed can be easily performed by appropriately changing the NC program based on the cutting load.

EFFECTS OF THE INVENTION

 The present invention provides a machine tool control apparatus, a machine tool control method and a machine tool control system with which adaptive control can be easily performed.

BRIEF DESCRIPTION OF THE DRAWINGS

1 Fig. 10 is a block diagram of the configuration of the machine tool control system relating to an embodiment;

2A and 2 B Fig. 10 are simplified diagrams illustrating the function of the machining instruction divider in one embodiment; and

3 Fig. 10 is a block diagram of the configuration of the machine tool control system relating to another embodiment.

DETAILED DESCRIPTION OF THE INVENTION

Configuration of the machine tool control system 1

The configuration of the machine tool control system 1 relating to this embodiment will now be described with reference to the drawings. 1 is a block diagram of the configuration of the machine tool control system 1 ,

The machine tool control system 1 has a machine tool 10 and a CNC (Computer Numerical Control) machine tool control device 20 on.

1. Machine tool 10

The machine tool 10 has a motor amplifier 11 , a main axis motor 12 , a feed axis motor 13 and a cutting tool 14 on. The motor amplifier 11 operates the main axis engine 12 and the feed axis motor 13 based on machining commands coming from the CNC machine tool control device 20 be issued. The main axis engine 12 drives the main axis of the cutting tool 14 turning on. The feed axis motor 13 drives the table feed axis of the cutting tool 14 at. The cutting tool 14 For example, an end mill, a drill, a drill, a tap, etc. are not limited to these.

2. CNC machine tool control device 20

The CNC machine tool control device 20 has a cutting load detector 21 , a determination section 22 , a detector 23 for a processing instruction to be split, a processing instruction divider 24 and a controller 25 on.

(1) Cutting Load Detector 21

The cutting load detector 21 Detects the cutting load on the cutting tool 14 is exercised. The cutting load detector 21 detects one or more of the following: the load reading, the current value, the voltage value and the power value for the main axis motor 12 , the load reading, the current value, the voltage value and the power value for the feed axis motor 13 , the major axis load of the cutting tool 14 and the cutting torque of the cutting tool 14 ,

(2) determining part 22

The determining part 22 provides on the basis of the cutting load detector 21 Detected cutting load determines whether the cutting tool 14 located in the middle of the cutting work. The determining part 22 compares the detected cutting load with a desired load, determines that the cutting work is taking place when the cutting load is at or above the desired load, and determines that the cutting work does not take place when the cutting load is below the desired load. The determining part 22 gives the determination result, whether the cutting tool 14 is located in the middle of the cutting work, to the machining instruction splitter 24 out.

The determining part 22 provides on the basis of the cutting load detector 21 detected cutting load, whether excessive load on the cutting tool 14 is exercised. The determining part 22 compares the detected cutting load with a predetermined threshold (> target load), determines that excessive load is applied when the cutting load is at or above the threshold, and determines that excessive load is not applied when the cutting load is less than that Threshold is. The determining part 22 gives the judgment result, if there is an excessive load, to the machining instruction divider 24 out.

(3) detector 23 for a processing command to be split

The detector 23 for an edit command to be split, an NC (Numerical Control) program analyzes 30 each in block steps. The NC program 30 includes a plurality of processing commands (G-codes) for processing about each axis in the machine tool 10 to move, to set coordinates, etc. These machining commands include the target coordinates and the feed rate (F-code) for Move the cutting tool 14 to these target coordinates.

The detector 23 For a processing command to be split, among the plurality of processing commands, a processing command that is to be divided by the processing command divider is stored 24 (which will be referred to as the "machining command Pa to be split up" hereinafter). In the detection of a processing command to be split Pa from the NC program 30 gives the detector 23 for a processing command to be split, the processing command Pa to be divided to the processing command divider 24 out. The detector 23 for a processing command to be split, the processing commands other than the processing command Pa to be split (which will be referred to as the "normal processing commands Pb" hereinafter) are given to the controller 25 out.

(4) machining instruction dividers 24

The editing command divider 24 detects the processing command Pa to be split from the detector 23 for a processing command to be split. The editing command divider 24 splits the processing command to be split Pa at a predetermined time interval to generate a plurality of short-term processing commands (to be referred to as "split processing commands Pc" hereinafter).

The editing command divider 24 has an operation command setting part 26 , a cutting command setting part 27 and a machining command generating part 28 on. the 2A and 2 B are simplified diagrams of the functions of the operation command setting part 26 and the operation command setting part 27 ,

(4-1) Operation command setting part 26

The operation command setting part 26 analyzes the processing command Pa to be divided after the detection of the processing command Pa to be divided by the detector 23 to an editing instruction to be split. As in 2A As shown, the processing command to be split includes an operation command Q and a cut command R. The operation command Q indicates the feed speed (F∇∇) and the main axis rotational speed (S∇∇) of the cutting tool 14 at. The cutting command R indicates the target coordinates (G1X0.5), to which the cutting tool 14 is moved. The quotient obtained by dividing the distance to the target coordinates (G1X0.5) by the feed speed (F∇∇) is the total time T based on the machining instruction Pa to be split required for the machining.

If the determining part 22 determines that the cutting tool 14 is located in the middle of processing, the operating command setting part 26 the total time T at predetermined time intervals, as in 2 B shown. In 2 B has the operation command setting part 26 the total time T is divided into first to fifth split periods T1 to T5 (the time interval between all split periods is the same), however, there are no particular limitations on the length of the split periods T1 to T5 or the number of split periods.

The operation command setting part 26 First adjusts the feed speed (F∇∇) and the main axis speed (S∇∇) in the first split period T1. The feed speed (F∇∇) and main axis speed (S∇∇) indicated by the operation command Q of the machining command Pa to be split can be used in this first split period T1.

The operation command setting part 26 generates a first divided operation command Q1 indicative of the feed speed (F∇∇) and the major axis rotation speed (S∇∇) in the first division period T1, and gives it to the machining command generating part 28 out.

The machining command generating part 28 compares the first divided operation command Q1 given by the operation command setting part 26 is generated, with a first divided cutting command R1, by the Betriebsbefehlseinstellteil 27 is generated (which will be explained below) to generate the first divided processing command P1, and gives this to the controller 25 out. The control device 25 controls the cutting tool 14 based on the first split edit command P1.

As in 2 B 2, the operation command setting part detects 26 Runtime data on the cutting load of the cutting tool 14 which is controlled on the basis of the first divided machining command P1, from the cutting load detector 21 , The operation command setting part 26 sets the feed rate (F **) and the major axis rotational speed (S **) in the second division period T2 on the basis of the cutting load during the first division period T1. When the cutting load during the first division period T1 is lower than the desired target load, the operation command setting part may 26 increase the feed speed (F **) in the second split period T2 so as to be higher than the feed speed (F∇∇) in the first split period T1, and increase the main axis speed (S **) in the second split period T2 so that it is higher than the major axis rotational speed (S∇∇) in the first division period T1. A such control allows the cutting load of the cutting tool 14 the target load is approximated.

As with the above-mentioned first divided operation command Q1, the operation command setting part generates 26 a second divided operation command Q2 indicative of the feed speed (F **), the major axis rotation speed (S **), and the (forward) feed direction in the second division period T2, and gives it to the processing command generating part 28 out. Thereafter, the operation command setting part generates 26 successively a third split operation command Q3, a fourth split operation command Q4, and a fifth split operation command Q5, as well as the second split operation command Q2. The feed rates and main axis speeds indicated by the various split operation commands may differ.

If the determining part 22 determines that during the first to fifth division period T1 to T5 an excessive load on the cutting tool 14 is exercised generates the operation command setting part 26 Quickly, a return operation command indicating a predetermined feed speed, main axis speed and (backward) feed direction, and gives this to the processing command generating part 28 out. The machining command generating part 28 generates a return command indicating the return operation command issued by the operation command setting part 26 is compared with the feedback cut command given by the operation command setting part 27 is generated (which will be explained below), and gives this to the controller 25 out. The control device 25 moves the cutting tool 14 based on the return command in the opposite direction, thereby eliminating the excessive load on the cutting tool 14 is exercised.

In addition, the operation command setting part gives 26 the operation command Q of the machining command Pa to be divided directly to the machining command generating part 28 without dividing it first, if the determining part 22 determines that the cutting tool 14 not located in the middle of the cutting work ,.

(4-2) Cutting command setting part 27

The operation command setting part 27 detects the first split operation command Q1 from the operation command setting part 26 at the point where the operation command setting part 26 generates the first split operation command Q1. The operation command setting part 27 calculates the product of the first division period T1 and the feed rate (F∇∇) included in the first divided operation command Q1. The operation command setting part 27 represents the sum of the addition of the initial coordinates of the cutting tool 14 to the product as the target coordinates (G1X0.1) of the first divided machining command P1.

The operation command setting part 27 generates the first divided cutting command R1 indicative of the target coordinates (G1X0.1) and gives it to the machining command generating part 28 out. As explained above, the machining instruction generating part generates 28 the first divided machining command P1 by comparing the first divided operation command Q1 given by the operation command setting part 26 with the first split cutting command R1 generated by the operation command setting part 27 is generated, and gives it to the controller 25 out. The control device 25 controls the cutting tool 14 based on the first split edit command P1.

The operation command setting part 27 detects the second divided operation command Q2 from the operation command setting part 26 at the point where the operation command setting part 26 generates the second split operation command Q2. The operation command setting part 27 calculates the product of the predetermined time interval T2 and the feed rate (F **) included in the second divided operation command Q2. The operation command setting part 27 sets the sum of addition of the target coordinates (G1X0.1) of the first divided machining command P1 to the product as the target coordinates (G1X0.2) of the second divided machining command P2.

The operation command setting part 27 generates a second divided cutting command R2 indicative of the target coordinates (G1X0.2), and gives it to the machining command generating part 28 out. Thereafter, the operation command setting part generates 27 successively a third divided cutting command R3, a fourth divided cutting command R4 and a fifth divided cutting command R5, as well as generating the second divided cutting command R2.

However, if the determining part 22 determines that during the first to fifth division period T1 to T5 an excessive load on the cutting tool 14 is exercised generates the operation command setting part 27 Quickly, a feedback cut command indicating predetermined target coordinates, and gives this to the machining command generating part 28 out. As explained above, the machining command generating part generates 28 a return command by comparing the return operation command issued by the Betriebsbefehlseinstellteil 26 is generated with the feedback cut command given by the operation command setting part 27 is generated, and gives it to the controller 25 out.

• (1) In dieser Ausführungsform weist der Bearbeitungsbefehlsteiler 24 der CNC-Werkzeugmaschinensteuervorrichtung 20 das Betriebsbefehlseinstellteil 26 und das Betriebsbefehlseinstellteil 27 auf. Das Betriebsbefehlseinstellteil 26 stellt die Vorschubgeschwindigkeit (F**) und die Hauptachsendrehzahl (S**) des zweiten aufgeteilten Bearbeitungsbefehls P2 gemäß der Schneidbelastung während der Steuerung gemäß dem ersten aufgeteilten Bearbeitungsbefehl P1 ein. Das Betriebsbefehlseinstellteil 27 stellt die Summe der Addition der Sollkoordinaten (G1X0.1) des ersten aufgeteilten Bearbeitungsbefehls P1 mit dem Produkt der Multiplikation des vorgegebenen Zeitintervalls T2 mit der Vorschubgeschwindigkeit (F**) des zweiten aufgeteilten Bearbeitungsbefehls P2, der durch das Betriebsbefehlseinstellteil 26 eingestellt wird, so ein, dass sie die Sollkoordinaten (G1X0.2) des zweiten aufgeteilten Bearbeitungsbefehls P2 ist.

In addition, the operation command setting part gives 27 the target coordinates (G1X0.5) given by the cutting command R of the machining command Pa to be divided are directly sent to the machining command generating part 28 off when the determining part 22 determines that the cutting tool 14 not located in the middle of the cutting work. characteristics

• (1) In this embodiment, the machining instruction divider 24 the CNC machine tool control device 20 the operation command setting part 26 and the operation command setting part 27 on. The operation command setting part 26 sets the feed speed (F **) and the major axis rotational speed (S **) of the second divided machining command P2 according to the cutting load during the control according to the first divided machining command P1. The operation command setting part 27 represents the sum of the addition of the target coordinates (G1X0.1) of the first divided machining command P1 with the product of the multiplication of the predetermined time interval T2 with the feeding speed (F **) of the second divided machining command P2 set by the operation command setting part 26 is set to be the target coordinates (G1X0.2) of the second divided machining instruction P2.

• (2) Wenn die Schneidbelastung während der ersten Aufteilungsperiode T1 niedriger als die erwünschte Sollbelastung ist, erhöht das Betriebsbefehlseinstellteil 26 die Vorschubgeschwindigkeit (F**) in der zweiten Aufteilungsperiode T2 so, dass sie höher als die Vorschubgeschwindigkeit (F∇∇) in der ersten Aufteilungsperiode T1 ist, und erhöht die Hauptachsendrehzahl (S**) in der zweiten Aufteilungsperiode T2 so, dass sie höher als die Hauptachsendrehzahl (S∇∇) in der ersten Aufteilungsperiode T1 ist.

Consequently, the feed speed and the major axis rotational speed for the next machining period may be based on the cutting load on the cutting tool 14 can be set in a given machining period, and the target coordinates in the next machining period can be set on the basis of the feed speed thus set. Therefore, the control for automatically changing the machining conditions (so-called adaptive control) can be easily performed without providing a separate control apparatus for adaptive control by appropriately changing (splitting) the NC program on the basis of the cutting load.

• (2) When the cutting load during the first division period T1 is lower than the desired target load, the operation command setting part increases 26 the feed speed (F **) in the second split period T2 is higher than the feed speed (F∇∇) in the first split period T1, and increases the main axis speed (S **) in the second split period T2 so as to increase is higher than the major axis rotational speed (S∇∇) in the first division period T1.

• (3) Wenn die Schneidbelastung während der Steuerung gemäß dem ersten aufgeteilten Bearbeitungsbefehl P1 auf oder über einem vorgegebenen Schwellenwert liegt, der größer als die Sollbelastung ist, stellt das Betriebsbefehlseinstellteil 26 die Vorschubrichtung, die den zweiten aufgeteilten Bearbeitungsbefehl P2 betrifft, so ein, dass sie in die entgegengesetzte Richtung des ersten aufgeteilten Bearbeitungsbefehls P1 verläuft.

This allows the cutting load of the cutting tool to be reduced 14 efficiently the target load is approximated, so that the accuracy of the adaptive control can be improved.

• (3) When the cutting load during the control according to the first divided machining command P1 is at or above a predetermined threshold value larger than the target load, the operation command setting part sets 26 the feeding direction concerning the second divided processing command P2 is such that it is in the opposite direction of the first divided processing command P1.

This allows the cutting tool 14 is returned quickly, leaving an excessive load on the cutting tool 14 exercised, can be eliminated quickly.

Other embodiments

The present invention is not limited to or by the above embodiment, and various modifications or variations are possible without departing from the scope of the present invention.

In the above embodiment, the operation command setting part 26 the feed rate and the major axis speed in the next split period, using exactly the cut load in the immediately preceding split period, but this is only an option. The operation command setting part 26 may adjust the feed rate and main axis speed in the next split period by using the cut load in the two or more previous split periods, rather than just using the cut load in the immediately preceding split period.

In the above embodiment, the operation command setting part 26 feed rate and main axis speed by using the cut load in the immediately preceding split period for all split periods, but this is only an option. The operation command setting part 26 can adjust the feed rate and main axis speed by using the cut load in the immediately preceding split period for exactly one particular split period or periods. In this case, the feed speed (F∇∇) and the main-axis speed (S∇∇) indicated by the operation command Q of the processing command to be split Pa may be used for the feed speed and the main-axis speed in the other division periods.

In the machine tool control system 1 Concerning the above embodiment, it was said that the CNC machine tool control device 20 the cutting load detector 21 , the determining part 22 , the detector 23 for an edit command to be split and the edit command splitter 24 However, this is only an option. The cutting load detector 21 , the determining part 22 , the detector 23 for a processing instruction to be split, and the machining instruction divider 24 can outside the CNC machine tool control device 20 be arranged.

For example, in the machine tool control system 1a , this in 3 is shown, an NC program analyzer 40 located at a location physically separate from the CNC machine tool control device 20 is disconnected, with the cutting load detector 21 , the determining part 22 , the detector 23 for an edit command to be split and the edit command divider 24 be equipped.

The machine tool control system 1a points the machine tool 10 , the CNC machine tool control device 20 , the NC program analyzer 40 , a data acquisition part 50 and a server 60 on. The data acquisition part 50 is with the machine tool 10 , the CNC machine tool control device 20 and the server 60 connected via a network connection. The data acquisition part 50 detects the cutting load on the cutting tool 14 from the machine tool 10 exercised and records the NC program 30 from the CNC machine tool control device 20 , The data acquisition part 50 sends this information to the server 60 , It may, for example, be a tablet computer as the data collection part 50 be used.

The server 60 is with the NC program analyzer 40 and the data acquisition part 50 connected via the network connection. The server 60 can with the data acquisition part 50 be connected via a portable high-speed connection (LTE) line. The server 60 stores from the data acquisition part 50 captured information and sends the data collection part 50 collected information in response to a request from the NC program analyzer 40 to the NC program analyzer 40 ,

In the NC program analyzer 40 which is described in the above embodiment generates the detector 23 for a processing command to be scheduled, normal processing commands Pb, and the processing command divider 24 generates the first to fifth divided machining commands P1 to P5. The normal machining commands Pb and the first to fifth divided machining commands P1 to P5 generated by the NC program analyzer 40 are generated in the control device 25 the CNC machine tool control device 20 via a storage medium (such as a USB memory) or via a network connection.

Again, with this machine tool control system 1a An adaptive control can be easily performed by appropriately dividing the NC program on the basis of the cutting load.

LIST OF REFERENCE NUMBERS

1

 Machine tool control system

10

 machine tool

14

 cutting tool

20

 CNC machine tool control device

21

 Cutting load detector

22

 Finding part

23

 Detector for a processing command to be split up

24

 Editing command divider

25

 control device

26

 Betriebsbefehlseinstellteil

27

 Schneidbefehlseinstellteil

28

 Edit command generating section

Pa

 to be distributed processing command

pb

 normal editing command

pc

 split editing command

P1 to P5

 first to fifth split edit command

Q1 to Q5

 first to fifth split operation command

R1 to R5

 first to fifth split cutting command

T1 to T5

 first to fifth divisional period

Claims (5)

A machine tool control apparatus configured to control a cutting tool based on an NC program, the machine tool control apparatus comprising: a cutting load detector configured to detect a cutting load applied to the cutting tool; a machining instruction divider configured to divide a machining command to be divided contained in the NC program into a plurality of divided machining commands in a predetermined time interval; and a controller configured to control the cutting tool based on the plurality of divided machining commands, wherein the plurality of divided machining commands comprises a first divided machining command and a second divided machining command, each of which has target coordinates Feed speed and a major axis speed, the machining instruction divider having an operation command setting part and a cutting command setting part configured to set a feed speed and main axis speed of the second divided machining command according to a cutting load during the control according to at least the first divided machining command; and the operation command setting part is configured to set a sum of the addition of the target coordinates of the first divided machining command with a product of the multiplication of the feed speed of the second divided machining command set by the operation command setting part with the predetermined time interval as the target coordinates of the second divided machining command. A machine tool control apparatus according to claim 1, wherein the operation command setting part is configured: set the feed speed of the second divided machining command higher than the feed speed of the first divided machining command when the cutting load during the control according to the first divided machining command is lower than a target load, and set the feed speed of the second divided machining command lower than the feed speed of the first divided machining command when the cutting load during the control according to the first divided machining command is higher than the target load. The machine tool control apparatus according to claim 2, wherein the operation command setting part is configured to set a feed direction concerning the second divided machining command to be opposite to a feed direction concerning the first divided machining command when the cutting load during the control according to the first divided machining command is above or above a predetermined threshold that is above the target load. A machine tool control method for controlling a cutting tool based on an NC program, the machine tool control method comprising: Setting a feed speed and a main axis speed of a second divided machining command following a first divided machining command according to a cutting load during the control according to at least the first divided machining command; and Setting a sum of addition of target coordinates of the first divided machining command with a product of multiplying the feed speed of the second divided machining command by a time interval of the second divided machining command as target coordinates of the second divided machining command. A machine tool control system configured to control a cutting tool based on an NC program, the machine tool control system comprising: a cutting load detector configured to detect a cutting load applied to the cutting tool; a machining instruction divider configured to divide a machining command to be divided contained in the NC program into a plurality of divided machining commands in a predetermined time interval; and a controller configured to control the cutting tool based on the plurality of divided processing commands; wherein the plurality of divided processing commands include a first divided processing command and a second divided processing command each including target coordinates, a feed speed, and a main axis speed, the machining instruction divider has an operation command setting part and a cutting command setting part, the operation command setting part is configured to set the feed speed and the main axis rotational speed of the second divided machining command according to a cutting load during the control according to at least the first divided machining command; and the operation command setting part is configured to set a sum of addition of the target coordinates of the first divided machining command with a product of multiplication of the feed speed of the second divided machining command set by the operation command setting part with the predetermined time interval as target coordinates of the second divided machining command.

Images