JP2011180650A - Machine tool, method for determining transfer of machine tool, control program, and storage medium - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a machine tool, a method for determining of transfer of a machine tool, and a control program capable of preventing detection errors of the transfer of a machine tool, and to provide a storage medium thereof. <P>SOLUTION: When an operator depresses a power source OFF button, a CPU stores the position coordinate of a Z axis in a power failure coordinate storage area. When an operator depresses a power source ON button, the CPU reads the position coordinate of the Z axis (S120). The CPU determines whether a deviation amount between the position coordinate stored in the power failure coordinate storage area and the position coordinate of the Z axis read in S120 lies within a predetermined range (S130). When the deviation amount lies within the predetermined range (Yes in S130), the CPU determines that the machine tool is not transferred and terminates processing for determining transfer. When the distortion amount lies out the predetermined range (No in S130), the CPU 51 determines that the machine tool has been transferred and stores "1" in a transfer prohibition flag storage area (S140). <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a machine tool, a machine tool relocation determination method, a control program, and a storage medium, and more particularly to a machine tool that determines the relocation of a machine tool by detecting the position of a movable part.

  Conventionally, export destinations of machine tools are regulated according to the number of controllable machining axes. Therefore, some machine tools have a function of detecting movement from an installation place, that is, relocation. The machine tool having the function prohibits the operation of the machine tool when the machine tool is moved.

  For example, the machine tool with a relocation determination function of Patent Document 1 detects relocation based on the position coordinates and movement direction of the movable part when the power is turned off, and the position coordinate and movement direction of the movable part when the power is turned on. . Specifically, the position coordinates of the movable part when the power is turned off are different from the position coordinates of the movable part when the power is turned on, and the moving direction of the movable part when the power is turned off is different from the moving direction of the movable part when the power is turned on. If it is different, it will be judged as relocation.

JP 2009-116473 A

  When the movable part is a spindle head that moves in the vertical direction, the spindle head drops due to its own weight when the power is turned off, so the machine tool is provided with a mechanical brake. However, the spindle head falls until the mechanical brake is activated. The mechanical brake is operated after the position coordinates of a movable part such as a spindle head are stored in a backup RAM or the like. Therefore, the machine tool has different position coordinates when the power is turned off and position coordinates when the power is turned on.

  When the operator moves the spindle head in a direction different from that at the time of turning off the power after the power is turned on, the relocation determination function of the machine tool of Patent Document 1 may determine that the relocation is performed even though the relocation is not performed. If it is decided to move, the operator must contact the machine tool manufacturer to lift the prohibition on the operation of the machine tool. Until the prohibition of the operation of the machine tool is lifted, there is a problem that the worker cannot perform the work.

  Usually, in order to prevent a movable part (spindle head, table, etc.) from moving due to vibration or the like when the machine tool is moved, an operator fixes the movable part with a fixing tool before the power is cut off. When the machine tool is moved by the above-described method, the position coordinates of the movable part do not change between when the power is turned off and when the power is turned on. Therefore, the machine tool of Patent Document 1 has a problem that it cannot detect the relocation despite the relocation.

  The present invention has been made to solve the above-described problems, and an object of the present invention is to provide a machine tool, a machine tool transfer determination method, a control program, and a storage medium that can prevent erroneous detection of machine tool transfer. And

  In order to achieve the above object, a machine tool according to a first aspect of the present invention comprises position detection means for detecting the position of a movable part of the machine tool, and the position of the movable part detected by the position detection means when the power is shut off. And the position of the movable part detected by the position detection means when the power is turned off in a machine tool that determines the relocation of the machine tool based on the position of the movable part detected by the position detection means when the power is turned on. Determining means for determining whether or not a deviation amount from the position of the movable portion detected by the position detection means when the power is turned on is within a predetermined range, and the determination means determines that the deviation amount is within the predetermined range. Operation control means for permitting the operation of the machine tool when determined and prohibiting the operation of the machine tool when it is determined that the deviation amount is not within the predetermined range is provided.

  The machine tool of the invention according to claim 2 is characterized in that, in addition to the configuration of the invention of claim 1, the movable portion is movable in the vertical direction.

  A machine tool according to a third aspect of the present invention includes, in addition to the configuration of the invention according to the first or second aspect, a power-off-time position storage unit that stores the position of the movable portion detected by the position detection unit at the time of the power-off. The determination means further includes a shift amount between the position of the movable part stored by the power-off position storage means and the position of the movable part detected by the position detection means when the power is turned on within a predetermined range. It is characterized by determining whether or not.

  According to a fourth aspect of the present invention, there is provided a method for determining the relocation of a machine tool based on the position of the movable part detected by the position detecting means when the power is turned off and the position of the movable part detected by the position detecting means when the power is turned on. Then, in the machine tool relocation determination method for determining the relocation of the machine tool, the position of the movable part detected by the position detection means when the power is turned off, and the position of the movable part detected by the position detection means when the power is turned on. A determination step of determining whether or not a deviation amount from a position is within a predetermined range; and the operation of the machine tool is permitted when the deviation amount is determined to be within the predetermined range in the determination step; And an operation control step for prohibiting the operation of the machine tool when it is determined that it is not within the predetermined range.

  According to a fifth aspect of the present invention, there is provided a control program to be executed by a computer for determining whether to move a machine tool, the position of the movable portion detected by the position detecting means when power is turned off, and the position detecting means detected when the power is turned on. In a control program to be executed by a computer that determines whether to move a machine tool based on the position of the movable part, the position of the movable part detected by the position detection means when the power is turned off, and the position detection means when the power is turned on Determining whether the deviation amount from the position of the movable portion detected by is within a predetermined range; and in the determination step, if the deviation amount is determined to be within the predetermined range, the machine tool is operated. And an operation control step for prohibiting the operation of the machine tool when it is determined that the deviation amount is not within the predetermined range.

  A storage medium according to a sixth aspect of the invention is a computer-readable storage medium storing the control program according to the fifth aspect.

  In the machine tool of the first aspect, the judging means determines whether or not a deviation amount between the position of the movable part detected by the position detecting means when the power is turned off and the position of the movable part detected by the position detecting means when the power is turned on is within a predetermined range. Determine whether. The operation control unit permits the operation of the machine tool when the determination unit determines that the deviation amount is within the predetermined range, and prohibits the operation of the machine tool when it is determined that the deviation amount is not within the predetermined range. The machine tool can prevent an error in the determination of relocation during normal use when the amount of change in the position of the movable part when the power is cut off during normal use is within a predetermined range. Therefore, the machine tool can reliably detect that it has been moved.

  In the machine tool according to claim 2, in addition to the effect of the invention according to claim 1, the movable part is movable in the vertical direction. The position of the movable portion in the vertical direction changes depending on its own weight when the power is shut off and when the power is turned on. Therefore, the machine tool can easily determine that the power source has been cut off and moved by changing the position of the movable portion in the vertical direction.

  In addition to the effect of the invention described in claim 1 or 2, the machine tool according to claim 3 is provided with a power shut-off position storage means for storing the position of the movable portion when the power is shut off. The determining means can determine the relocation from the position storage means at power-off and the position coordinates of the movable part detected by the position detecting means at power-on. Therefore, the machine tool can detect that it has been moved with a simple configuration without providing a sensor or the like.

  According to another aspect of the machine tool relocation determination method of the present invention, the determination step includes a predetermined amount of deviation between the position of the movable part detected by the position detection means when the power is turned off and the position of the movable part detected by the position detection means when the power is turned on. Determine whether it is within range. The operation control process permits the operation of the machine tool when it is determined by the determination process that the deviation amount is within the predetermined range, and prohibits the operation of the machine tool when it is determined that the deviation amount is not within the predetermined range. The method for determining the relocation of the machine tool can prevent an error in the determination of relocation during normal use when the amount of change in the position of the movable part at the time of power interruption during normal use is within a predetermined range. Therefore, the machine tool relocation determination method can reliably detect the relocation.

  In the control program according to claim 5, the determining step is whether or not a deviation amount between the position of the movable part detected by the position detecting unit when the power is turned off and the position of the movable part detected by the position detecting unit when the power is turned on is within a predetermined range. Determine whether. The operation control step permits the operation of the machine tool when it is determined by the determination step that the deviation amount is within the predetermined range, and prohibits the operation of the machine tool when it is determined that the deviation amount is not within the predetermined range. The control program can prevent an error in the determination of relocation during normal use when the amount of change in the position of the movable part when the power is cut off during normal use is within a predetermined range. Therefore, the control program can reliably detect the transfer.

  Since the storage medium according to the sixth aspect is a computer-readable storage medium storing the control program according to the fifth aspect, the effect according to the fifth aspect can be obtained.

1 is a perspective view showing an overall configuration of a machine tool 1. 3 is a side view of the machine body 3. FIG. FIG. 4 is a side view of a main part of the tool changer 25. 3 is an enlarged perspective view of a fixing jig 100. FIG. 1 is a block diagram showing an electrical configuration of a machine tool 1. FIG. 3 is a conceptual diagram of a backup RAM 55. FIG. It is a flowchart of a transfer determination process (when the power of the machine tool 1 is turned off). It is a flowchart of a transfer determination process (when the power of the machine tool 1 is turned on).

  Hereinafter, a machine tool 1 according to an embodiment of the present invention will be described with reference to the drawings. In the following description, the left side, the right side, the front side, and the back side of FIG. 1 are the left side, right side, front side, and rear side of the machine tool 1, respectively.

  The structure of the machine tool 1 will be briefly described with reference to FIGS. The machine tool 1 is a machine that can perform a desired cutting process on the workpiece by relatively moving the workpiece and the tool 13. As shown in FIG. 1, the machine tool 1 includes an iron base 2 and a machine body 3 (see FIG. 2) provided on the top of the base 2. A splash cover 4 covering the periphery of the machine body 3 is fixed to the upper portion of the base 2.

  The splash cover 4 has an opening 40 on the front surface. The sliding door 5 opens and closes the opening 40. The splash cover 4 is provided with an operation panel 10 on the right side of the opening 40 for operating the machine tool 1. The operation panel 10 is provided with a display 11 for displaying various setting screens and the like on the top thereof. The operation panel 10 is provided with a keyboard 12 having various operation keys at the bottom of the display 11.

  As shown in FIG. 2, the machine body 3 includes a column 21, a frame 6, a spindle head 7, a spindle 9, a tool changer 25, and a table 15. The column 21 stands up behind the base 2. The column 21 is provided with a control box 22 on the back thereof. The control box 22 houses therein a numerical control device 50 (see FIG. 5) that controls the operation of the machine tool 1. The column 21 supports a pair of left and right frames 6 (only the right side is shown in FIG. 2) extending forward in the upper part. The frame 6 supports the tool changer 25 at the tip. The spindle head 7 is provided so as to be movable up and down along the column 21. The spindle head 7 rotatably supports the spindle 9. The tool changer 25 includes a rotary tool magazine 26.

  The table 15 is provided in the upper part of the base 2 so as to be movable in the X-axis direction (left-right direction) and the Y-axis direction (front-back direction). The table 15 is moved in the X direction by an X axis moving mechanism (not shown). The table 15 is moved in the Y-axis direction by a Y-axis moving mechanism (not shown). The X-axis moving mechanism is provided with an X-axis feed guide (not shown) that guides the table 15 in the X-axis direction. The Y-axis moving mechanism is provided with a Y-axis feed guide (not shown) that guides the table 15 in the Y-axis direction. The table 15 is controlled to move in the X-axis direction and the Y-axis direction by an X-axis motor 71 (see FIG. 5) and a Y-axis motor 72 (see FIG. 5), which are servo motors.

  The spindle head 7 and the table 15 correspond to the “movable part” of the present invention.

  When moving the machine tool 1, the operator inserts the fixing jig 100 between the spindle head 7 and the table 15. The fixing jig 100 will be described later.

  As shown in FIG. 3, the spindle head 7 is supported so as to be movable up and down along a guide rail 23 provided vertically on the column 21. The column 21 rotatably supports a feed screw 20 extending in the vertical direction on the front surface thereof. The feed screw 20 has a drive shaft (not shown) of the Z-axis motor 73 connected to the upper end portion thereof. The spindle head 7 is connected to the feed screw 20 via a nut (not shown). The spindle head 7 moves up and down as the feed screw 20 rotates in the forward and reverse directions by driving the Z-axis motor 73. The spindle 9 is rotationally driven by a spindle motor 74 provided on the upper part of the spindle head 7. The spindle 9 is detachably mounted with a tool holder 14 that holds the tool 13.

  The tool changer 25 automatically changes the tool 13 attached to the spindle 9. The tool magazine 26 is disposed via a magazine support 27 fixed to the frame 6. The tool magazine 26 includes a plurality of (for example, ten) grip arms 28 (see FIG. 3) that hold the tool holder 14. The tool magazine 26 is rotatably fixed to the magazine support base 27. The tool magazine 26 is rotated by a magazine motor 75.

  As shown in FIG. 4, the fixing jig 100 includes a contact portion 102 that contacts the lower surface of the spindle head 7 and a contact portion 103 that contacts the upper surface of the table 15. The parts 103 are connected by a rod-like member 101. The operator inserts the fixing jig 100 between the spindle head 7 and the table 15. The operator fixes the contact portion 103 of the fixing jig 100 on the table 15. The operator lowers the spindle head 7 after fixing the contact portion 103 of the fixing jig 100 on the table 15. By lowering the spindle head 7, the lower surface of the spindle head 7 comes into contact with the contact portion 102 of the fixing jig 100. The operator fixes the contact portion 102 of the fixing jig 100 to the spindle head 7. Therefore, the fixing jig 100 can fix the position of the spindle head 7 in the Z-axis direction.

  With reference to the block diagram of FIG. 5, the electrical configuration of the numerical controller 50 of the machine tool 1 will be described.

  The numerical controller 50 includes a microcomputer including a CPU 51, a ROM 52, a RAM 53, and a backup RAM 55 (position storage means at power-off), an input interface 54, and an input / output interface 59. The backup RAM 55 is connected to a backup power source 56. The input interface 54 is electrically connected to the keyboard 12 of the operation panel 10. The keyboard 12 includes an axis movement key. The axis movement key is a key for moving the table 15 in the + direction (right) and − direction (left) of the X axis, and a key for moving the table 15 in the + direction (backward) and − direction (forward) of the Y axis. A key for moving the spindle head 7 in the + direction (upward) and the-direction (downward) of the Z-axis.

  The input / output interface 59 electrically connects the X axis drive circuit 61, the Y axis drive circuit 62, the Z axis drive circuit 63, the main axis drive circuit 64, the magazine drive circuit 65, and the display drive circuit 66. . The X axis drive circuit 61 drives the X axis motor 71. The Y axis drive circuit 62 drives the Y axis motor 72. The Z axis drive circuit 63 drives the Z axis motor 73. The spindle drive circuit 64 drives the spindle motor 74. The magazine drive circuit 65 drives the magazine motor 75. The display drive circuit 66 drives the display 11 of the operation panel 10. The X-axis motor 71, the Y-axis motor 72, the Z-axis motor 73, the main shaft motor 74, and the magazine motor 75 are provided with encoders 71a, 72a, 73a, 74a, 75a (position detecting means) for detecting the positions of the motors, respectively. . Each encoder 71a, 72a, 73a, 74a, 75a is connected to each drive circuit 61, 62, 63, 64, 65. The position coordinates of the X, Y, and Z axes can be obtained based on position feedback signals output from the encoders 71a, 72a, and 73a.

  The ROM 52 is provided with a control program area or the like that stores a control program for controlling the machine tool 1 including a transfer determination process described later. The RAM 53 is provided with a data storage area for storing various data acquired during machining of the workpiece and various work memories.

  The backup power source 56 can supply power to the backup RAM 55 even when there is no power supply to the machine tool 1 from the outside. Therefore, the backup RAM 55 can retain the stored contents even when the power is shut off.

  Various storage areas of the backup RAM 55 will be described with reference to FIG. The backup RAM 55 is provided with at least an operation prohibition flag storage area 551 for storing an operation prohibition flag and a power storage cutoff coordinate storage area 552.

  The operation prohibition flag stores the presence / absence of relocation of the machine tool 1 by relocation determination processing described later. When the machine tool 1 is moved, the operation prohibition flag storage area 551 stores “1”. When the operation of the machine tool 1 is permitted, the operation prohibition flag storage area 551 stores “0”.

  The coordinate storage area 552 at the time of power-off stores the position coordinates of the spindle head 7 when the operator presses a power-off button (not shown).

  With reference to the flowchart of FIG.7 and FIG.8, the moving determination process by the numerical control apparatus 50 of the machine tool 1 is demonstrated. However, the symbol Si (i = 10, 20...) In the figure is each step. In the present embodiment, only the determination of relocation due to a change in the Z-axis direction of the spindle head 7 will be described.

  The relocation determination process includes a process when the power is turned off to cut off the external power supply to the machine tool 1 and a process when the power is turned on to supply power to the machine tool 1 from the outside. As shown in the flowchart of FIG. 7, the process when the power is turned off is started when the operator presses the power off button while power is being supplied to the machine tool 1 from the outside. The CPU 51 stores the Z-axis position coordinate of the spindle head 7 obtained based on the position feedback signal output from the encoder 73a in the power shut-off coordinate storage area 552 (S10). The CPU 51 cuts off the power supply from the outside to the machine tool 1 (power OFF) (S20), and ends the processing at the time of power OFF.

  As shown in the flowchart of FIG. 8, when the power is turned on, the power is supplied to the machine tool 1 by the operator pressing the power ON button while the power supply from the outside is cut off to the machine tool 1. Start by supplying (power ON). The CPU 51 determines whether “0” is stored in the operation prohibition flag storage area 551 (S110). When “0” is not stored in the operation prohibition flag storage area 551 (S110: No), that is, when “1” is stored in the operation prohibition flag storage area 551, the CPU 51 proceeds to S150.

  When “0” is stored in the operation prohibition flag storage area 551 (S110: Yes), the CPU 51 reads the Z-axis position coordinate of the spindle head 7 obtained based on the position feedback signal output from the encoder 73a (S120). .

  The CPU 51 calculates the amount of deviation based on the Z-axis position coordinates of the spindle head 7 stored in the coordinate storage area 552 at power-off and the Z-axis position coordinates of the spindle head 7 read in S120. The CPU 51 determines whether or not the deviation amount is within a predetermined range (S130). When the deviation amount is within the predetermined range (S130: Yes), the CPU 51 determines that the machine tool 1 has not been transferred, operates the machine tool 1 (S180), and ends the transfer determination process. When the deviation amount is outside the predetermined range (S130: No), the CPU 51 determines that the machine tool 1 has been moved, and stores “1” in the operation prohibition flag storage area 551 (S140).

  The CPU 51 displays a warning message and a password input request on the display 11 at the same time as generating an alarm (S150). The CPU 51 determines whether or not the password input by the worker is correct (S160). If the password entered by the operator is incorrect (S160: No), the CPU 51 proceeds to S150.

  If the password entered by the operator is correct (S160: Yes), the CPU 51 stores “0” in the operation prohibition flag storage area 551 (S170). The CPU 51 operates the machine tool 1 (S180) and ends the transfer determination process.

  The CPU 51 that executes the process of S130 corresponds to the “determination unit” of the present invention. The CPU 51 that executes the processing from S140 to S180 corresponds to “operation control means” of the present invention.

  The predetermined range is a range of 4 to 60 μm. This range is based on the amount by which the position of the spindle head 7 changes downward in the Z-axis direction due to its own weight when the operator turns off the power during normal use of the machine tool 1. Therefore, when the power is turned off during normal use and then turned on, the deviation amount is within a predetermined range, and the CPU 51 can determine that the machine tool 1 has not been moved.

  As described above, when moving the machine tool 1, the operator inserts the fixing jig 100 (see FIG. 2) between the spindle head 7 and the table 15. When the power is turned off after the fixing jig 100 is inserted and the power is turned on after the relocation, there is almost no deviation and it is outside the predetermined range (0 to 4 μm). Therefore, the CPU 51 can determine that the machine tool 1 has been moved.

  When the power is turned off without inserting the fixing jig 100 and the power is turned on after the machine tool 1 is moved, the position of the spindle head 7 changes greatly due to vibration or the like during the transfer. Therefore, the amount of deviation becomes large and outside the predetermined range (60 μm or more). Therefore, the CPU 51 can determine the relocation of the machine tool 1.

  As described above, in the machine tool 1 of the present embodiment, it is determined whether or not the deviation amount of the spindle head 7 from the Z-axis position coordinate when the power is turned on is within a predetermined range. When the amount of deviation is within the predetermined range, the CPU 51 determines that the machine tool 1 has not been moved and ends the transfer determination process. When the deviation amount is outside the predetermined range, the CPU 51 determines that the machine tool 1 has been moved and prohibits the operation. The predetermined range is based on the amount of change in the Z-axis of the spindle head 7 when the operator turns off the power during normal use of the machine tool 1. Therefore, when the power is turned off during normal use and then turned on, the deviation amount is within a predetermined range. The machine tool 1 can prevent the CPU 51 from erroneously determining the transfer of the machine tool 1.

  The machine tool, the machine tool relocation determination method, the control program, and the storage medium of the present invention are not limited to the above-described embodiments, and various modifications are possible.

  The machine tool 1 according to the above embodiment determines the transfer of the machine tool 1 based on the amount of deviation between the position coordinates stored in the coordinate storage area 552 at power-off and the Z-axis position coordinates of the spindle head 7 when the power is turned on. . In the modification, a sensor for identifying the position of the spindle head 7 in the Z-axis direction is provided in the column 21. The sensor includes a light projecting element and a light receiving element. When the operator turns on the power, the CPU 51 identifies the position of the spindle head 7 in the Z-axis direction based on a signal from the light receiving element. The CPU 51 can determine the relocation of the machine tool 1 based on the identification result.

  In the machine tool 1 of the above embodiment, the main shaft 9 is movable in the Z-axis direction, and the table 15 is moved in the XY-axis direction. The present invention can also be applied to a machine tool of a type in which the position of the table 15 is fixed and the column 21 moves in the XY axis direction.

  The movable part of the above embodiment is configured by the spindle head 7. The movable part may be the table 15, and in that case, the relocation is determined by the change in the XY axis direction.

  The predetermined range of the above embodiment was in the range of 4 to 60 μm. The predetermined range is not limited to the range of the above-described embodiment, and may be a range based on the amount of change in the axis that determines whether to move the movable part when the operator turns off the power during normal use of the machine tool 1. .

  The machine tool 1 of the above embodiment is a vertical machining center. The present invention can also be applied to a horizontal machining center.

  The storage medium for storing the control program of the present invention is not limited to elements such as ROM and RAM. For example, the storage medium may be a CD-ROM or the like, a program cartridge that can be inserted into a card slot, or a file server on the Internet.

DESCRIPTION OF SYMBOLS 1 Machine tool 3 Machine main body 7 Spindle head 15 Table 25 Tool change apparatus 50 Numerical control apparatus 51 CPU
52 ROM
53 RAM
55 Backup RAM
59 I / O interface 61 X-axis drive circuit 62 Y-axis drive circuit 63 Z-axis drive circuit 71 X-axis motor 72 Y-axis motor 73 Z-axis motor 551 Operation inhibition flag storage area 552 Coordinate storage area at power-off

Claims (6)

Comprising position detecting means for detecting the position of the movable part of the machine tool;
In the machine tool that determines the relocation of the machine tool based on the position of the movable part detected by the position detection unit when the power is cut off and the position of the movable part detected by the position detection unit when the power is turned on,
Judgment means for judging whether or not a deviation amount between the position of the movable part detected by the position detection means when the power is shut off and the position of the movable part detected by the position detection means when the power is turned on is within a predetermined range. When,
Operation that permits the operation of the machine tool when the determination unit determines that the deviation amount is within the predetermined range, and prohibits the operation of the machine tool when the deviation amount is determined not to be within the predetermined range. A machine tool comprising a control means.   The machine tool according to claim 1, wherein the movable portion is movable in a vertical direction. A power shutdown position storage means for storing the position of the movable part detected by the position detection means at the time of the power shutdown;
The determination means determines whether or not a deviation amount between the position of the movable part stored by the position storage means at power-off and the position of the movable part detected by the position detection means at the time of power-on is within a predetermined range. The machine tool according to claim 1, wherein the machine tool is determined. Relocation determination method for a machine tool for determining relocation of a machine tool based on the position of the movable part detected by the position detection means at power-off and the position of the movable part detected by the position detection means at power-on In
A determination step of determining whether or not a deviation amount between the position of the movable part detected by the position detection unit when the power is shut off and the position of the movable part detected by the position detection unit when the power is turned on is within a predetermined range. When,
Operation that permits the operation of the machine tool when it is determined in the determination step that the deviation amount is within the predetermined range, and prohibits the operation of the machine tool when it is determined that the deviation amount is not within the predetermined range. A method for determining the relocation of a machine tool, comprising: a control process. A control program to be executed by a computer that determines whether to move a machine tool based on the position of the movable part detected by the position detection means when the power is shut off and the position of the movable part detected by the position detection means when the power is turned on In
A determination step of determining whether or not an amount of deviation between the position of the movable part detected by the position detection unit when the power is shut off and the position of the movable part detected by the position detection unit when the power is turned on is within a predetermined range; When,
Operation that permits the operation of the machine tool when it is determined in the determination step that the deviation amount is within the predetermined range, and prohibits the operation of the machine tool when it is determined that the deviation amount is not within the predetermined range. A control program to be executed by a computer for determining whether to move a machine tool.   A computer-readable storage medium storing the control program according to claim 5.