JP5477247B2 - Numerical control apparatus, moving path correcting method, moving path correcting program, and storage medium - Google Patents

Description

  The present invention relates to a numerical controller, a movement path correction method, a movement path correction program, and a storage medium.

  The numerical control device uses CAM (computer aided manufacturing) when generating a machining program for drawing a curve. CAM divides a curve into a plurality of blocks. The CAM may generate a minute block having a relatively large angle with the preceding and succeeding blocks due to a calculation error or the like. The numerical controller drives the motor by sending a movement amount corresponding to the command speed to the servo amplifier in a short cycle. When the minute block is less than the movement amount for the command speed, the tool decelerates rapidly. Therefore, tool marks may remain on the machined surface.

  In the movement path correcting method disclosed in Patent Document 1, the first, second, and third segments S1, S2, and S3 are zigzag with respect to three consecutive segment data in a movement path constituted by a plurality of segments. If the first condition and the second condition are both satisfied, the first condition is whether the second segment S2 is shorter than the set length. The movement path is corrected so that the movement amount of the second segment S2 is distributed to the movement amounts of the first and third segments S1 and S3.

Japanese Patent No. 3385247

  However, the movement path correction method disclosed in Patent Document 1 has a problem that the movement path is not corrected unless the three segments form a zigzag path. Therefore, since a minute block remains in the movement path, a good processed surface could not be obtained. If the zigzag path is excluded from the movement path correction condition of Patent Document 1, blocks shorter than a predetermined length will be deleted one after another, so the movement path of the tool deviates from the path commanded by the program There is.

  The present invention has been made in order to solve the above-mentioned problems, and can provide a good machining surface that is not affected by the deceleration of the tool, and the numerical value that does not greatly deviate from the route commanded by the program. It is an object to provide a control device, a movement path correction method, a movement path correction program, and a storage medium.

  In the numerical control device according to the first aspect of the present invention, a moving path of a machine tool composed of a plurality of blocks is moved through three consecutive blocks among the plurality of blocks. In a numerical controller that selects a block, an intermediate block that connects the start block and the end block, and sequentially corrects the movement path based on the three blocks, determines whether the intermediate block is equal to or less than a first predetermined length. First determining means for determining, when the first determining means determines that the intermediate block is longer than the first predetermined length, the first block determining means for determining the start block as a movement path of the machine tool, When the first determination means determines that the intermediate block is equal to or shorter than the first predetermined length, the start point of the start block is connected to the midpoint of the intermediate block. A correction means for correcting the lock as a new start block, a block connecting the midpoint of the intermediate block and the end point of the end block as a new intermediate block, and the new start block corrected by the correction means is a second block When the second determination means determines that the new start block is longer than the second predetermined length, the second determination means for determining whether the length is longer than the predetermined length, and when the second determination means determines that the new start block is longer than the second predetermined length, When the first block determination means determines the movement path of the machine tool, the intermediate block is the start block, the end block is the intermediate block, and the end is determined. The block next to the block is set as the end block, and the second block determining means determines the moving path of the machine tool. The new intermediate block is used as the start block, two blocks consecutive to the end block are set as the intermediate block and the end block in order, and the second start block is equal to or shorter than the second predetermined length. When the determination means determines, the new start block is the start block, the new intermediate block is the intermediate block, and the next block after the end block is the end block, and the three blocks are reset. Resetting means.

  In the first aspect, the first block determining means determines the start block as a route when the intermediate block is longer than the first predetermined length. When the intermediate block is less than or equal to the first predetermined length, the correction means uses the block connecting the start point of the start block and the intermediate point of the intermediate block as a new start block, and connects the intermediate point of the intermediate block and the end point of the end block Is modified as a new intermediate block. When the new start block is longer than the second predetermined length, the second block determination means determines the new start block as a route. When the new start block is not longer than the second predetermined length, the block resetting means sets the new start block as the start block, sets the new intermediate block as the intermediate block, sets the next block after the end block as the end block, 3 Reset one block. In the first aspect, if the intermediate block is longer than the first predetermined length, the start block is determined as a path. Therefore, the moving path of the machine tool does not include a block with a small moving amount on the way. If the new start block is longer than the second predetermined length, the new start block is determined as a route. Therefore, since the path is fixed when the new start block becomes larger than the predetermined length, the blocks are deleted one after another in the program in which micro blocks are continuous, and the tool greatly deviates from the path commanded by the program. There is no. Therefore, the 1st mode can obtain the good machined surface which does not deviate from the course which the tool commanded by the program, and is not influenced by the deceleration of the tool.

  In the movement path correction method according to the second aspect of the present invention, the movement path of a machine tool configured by a plurality of blocks is divided into three consecutive blocks among the plurality of blocks, the start block on the movement start side, and the movement end side In the movement path correction method performed by a numerical controller that selects an end block, an intermediate block connecting the start block and the end block, and sequentially corrects the movement path based on the three blocks, the intermediate block is a first block When it is determined in the first determination step that determines whether or not the length is equal to or less than a predetermined length and in the first determination step that the intermediate block is longer than the first predetermined length, the start block is determined as a movement path of the machine tool. In the first block determining step, the first determining step determines that the intermediate block is not longer than the first predetermined length. The block connecting the start point of the start block and the midpoint of the intermediate block is a new start block, and the block connecting the midpoint of the intermediate block and the end point of the end block is corrected as a new intermediate block. A second determination step for determining whether the new start block corrected in the correction step is longer than a second predetermined length; and, if the new start block is longer than the second predetermined length, the second A second block determination step for determining the new start block as the movement path of the machine tool when determined in the determination step; and a step of determining the intermediate block when the movement path of the machine tool is determined in the first block determination step. Is the start block, the end block is the intermediate block, and the end block is When the next block is the end block, and the movement path of the machine tool is determined in the second block determination step, the new intermediate block is the start block, and the two blocks consecutive to the end block are sequentially When the second determination step determines that the new start block is equal to or shorter than the second predetermined length, the intermediate block and the end block are used as the start block, and the new intermediate block And a block resetting step for resetting the three blocks with the block next to the end block as the end block.

  In the second aspect, the first block determination step determines the start block as a path when the intermediate block is longer than the first predetermined length. When the intermediate block is less than or equal to the first predetermined length, the block connecting the start point of the start block and the intermediate point of the intermediate block is a new start block, and the block connecting the intermediate point of the intermediate block and the end point of the end block Is modified as a new intermediate block. The second block determining step determines the new start block as a route when the new start block is longer than the second predetermined length. In the block resetting step, when the new start block is not longer than the second predetermined length, the new start block is set as the start block, the new intermediate block is set as the intermediate block, the block next to the end block is set as the end block, 3 Reset one block. Therefore, in the second mode, if the intermediate block is longer than the first predetermined length, the start block is determined as a route. Therefore, the moving path of the machine tool does not include a block with a small moving amount on the way. If the new start block is longer than the second predetermined length, the new start block is determined as a route. Therefore, in the program in which the minute blocks are continuous, the blocks are deleted one after another, and the tool does not deviate from the route specified by the program. According to the second aspect, it is possible to obtain a good machining surface that does not deviate from the route that the tool commands in the program and is not affected by the deceleration of the tool.

  The moving path correction program according to the third aspect of the present invention provides a moving path of a machine tool composed of a plurality of blocks, a continuous block of the plurality of blocks, a start block on the movement start side, and a movement end side An end block, an intermediate block that connects the start block and the end block, and a movement path correction program that controls the operation of the numerical controller that sequentially corrects the movement path based on the three blocks. When it is determined in the first determination step that determines whether or not the intermediate block is equal to or shorter than a first predetermined length, and in the first determination step that the intermediate block is longer than the first predetermined length, the start block is A first block determining step for determining as a movement path, and the intermediate block being equal to or shorter than the first predetermined length. If it is determined in the determining step, a block connecting the start point of the start block and the midpoint of the intermediate block is set as a new start block, and a block connecting the midpoint of the intermediate block and the end point of the end block is set as a new intermediate block. A correction step for correcting as a block; a second determination step for determining whether or not the new start block corrected in the correction step is longer than a second predetermined length; and the new start block from the second predetermined length. If it is determined in the second determining step that the length is long, the second block determining step for determining the new start block as the moving path of the machine tool, and the moving path of the machine tool is determined in the first block determining step. The intermediate block as the start block and the end block as the intermediate block If the block is a lock, the block next to the end block is the end block, and the movement path of the machine tool is determined in the second block determination step, the new intermediate block is the start block and continuous to the end block When the second determination step determines that the two starting blocks are sequentially the intermediate block and the end block, and the new start block is less than or equal to the second predetermined length, the new start block is the start block. And a block resetting step of resetting the three blocks with the new intermediate block as the intermediate block and the block next to the end block as the end block.

  In the third aspect, the computer executes various steps. The first block determining step determines the start block as a path when the intermediate block is longer than the first predetermined length. When the intermediate block is less than or equal to the first predetermined length, the block connecting the start point of the start block and the intermediate point of the intermediate block is a new start block, and the block connecting the intermediate point of the intermediate block and the end point of the end block Is modified as a new intermediate block. The second block determining step determines the new start block as a route when the new start block is longer than the second predetermined length. In the block resetting step, when the new start block is not longer than the second predetermined length, the new start block is set as the start block, the new intermediate block is set as the intermediate block, the block next to the end block is set as the end block, 3 Reset one block. In the second mode, if the intermediate block is longer than the first predetermined length, the start block is determined as a path. Therefore, the moving path of the machine tool does not include a block with a small moving amount on the way. If the new start block is longer than the second predetermined length, the new start block is determined as a route. Therefore, in the program in which the minute blocks are continuous, the blocks are deleted one after another, and the tool does not deviate from the route specified by the program. Therefore, the 3rd mode can obtain the good machined surface which does not deviate from the course which the tool commanded by the program, and is not influenced by the deceleration of the tool.

  A storage medium according to a fourth aspect of the present invention stores the movement route correction program according to claim 3.

  In the fourth aspect, the moving route correcting program according to claim 3 is stored. Therefore, the effects described in the third aspect can be obtained when the computer executes.

2 is a block diagram showing an electrical configuration of the numerical control device 1. FIG. 5 is a conceptual diagram showing the contents of a segment buffer 231. FIG. It is a flowchart of the movement path | route correction process which CPU21 performs. It is a figure of the 1st step of the movement path | route before correction. It is the figure of the 2nd step which corrected the movement path | route. It is the figure of the 3rd stage which corrected the movement path | route. It is the figure of the 4th step which corrected the movement path | route. It is a figure which shows the segment Si of the correction object of the segment buffer. It is a figure which shows the continuation of FIG.

  Hereinafter, a numerical controller 1, a movement path correction method, a movement path correction program, and a storage medium according to an embodiment of the present invention will be described with reference to the drawings. The numerical control device 1 shown in FIG. 1 controls the axial movement of the machine tool 2 according to a route commanded by the machining program. The machine tool 2 cuts the workpiece by relative movement of the workpiece and the tool.

  The electrical configuration of the numerical controller 1 will be described with reference to FIG. The numerical controller 1 includes a microcomputer having a CPU 21, ROM 22, RAM 23, and flash memory 24, an input interface 25, and an input / output interface 26. The input interface 25 is connected to the operation unit 12.

  The ROM 22 reads the machining program one block at a time in addition to the main program of the numerical control device 1 and generates segment data, and the “movement path correction” of the present invention for correcting a movement path composed of a plurality of segments. Program "etc. are memorized. The “movement path correction program” may be stored in the flash memory 24 or the like as a computer-readable storage medium. The RAM 23 includes at least a segment buffer 231. The segment buffer 231 stores segment data generated from the machining program. The flash memory 24 includes at least a machining program storage area 241 for storing machining programs.

  The input / output interface 26 drives a drive circuit 41 that drives the X-axis motor 51 of the machine tool 2, a drive circuit 42 that drives the Y-axis motor 52 of the machine tool 2, and a Z-axis motor 53 of the machine tool 2. The drive circuit 43 and the drive circuit 44 that drives the spindle motor 54 of the machine tool 2 are connected. The driving of the X-axis motor 51 and the Y-axis motor 52 moves the table (not shown) of the machine tool 2 in the X-axis direction and the Y-axis direction. The drive of the Z-axis motor 53 moves the spindle head (not shown) of the machine tool in the Z-axis direction.

  The X-axis motor 51, the Y-axis motor 52, the Z-axis motor 53, and the main shaft motor 54 are provided with encoders (not shown) that detect the position of each motor. Each encoder is connected to each drive circuit 41, 42, 43, 44.

  The segment data will be described. The path commanded by the machining program is, for example, a coordinate sequence composed of A1, A2,..., A8 as shown in FIG. When the operator operates the operation unit 12, the CPU 21 reads the coordinate sequence of A1 to A8 and segments data Si (hereinafter referred to as “segment data”) including the respective axis movement amounts Xi, Yi, Zi, the segment length Li, and the command speed F. , Simply referred to as “segment Si”). The subscript i indicates the block number from the start of the route. As shown in FIG. 2, the segment buffer 231 of the RAM 23 stores the generated segments S1, S2, and S3 in the order of commands.

  The CPU 21 creates a speed pattern of the spindle head based on the segments Si sequentially stored in the segment buffer 231. The CPU 21 calculates an interpolation command (movement amount per unit time) for each axis from the created speed pattern. The CPU 21 outputs the calculated interpolation command for each axis to the drive circuits 41, 42, and 43 of the X-axis motor 51, Y-axis motor 52, and Z-axis motor 53 of the machine tool 2, respectively.

  As shown in FIG. 2, the segment buffer 231 sequentially stores the segments Si in the block order in which the machining program is read. The CPU 21 sequentially corrects the movement path for the segment Si accumulated in the segment buffer 231 based on three consecutive blocks. The CPU 21 sets three consecutive blocks as processing target segments. In the present embodiment, for three segments, from the movement start side to the movement end side, the first segment (corresponding to the “start block” of the present invention) and the second segment (the “intermediate block” of the present invention) Equivalent) and the third segment (corresponding to the “end block” of the present invention).

  A pointer A indicates a position where a new segment Si read from the next block of the machining program is stored. Pointer B indicates the position of the first segment Si whose path has not yet been determined. Therefore, the CPU 21 increments the pointer A and stores the next segment Si in the pointer A until the segment Si for three segments is accumulated in the segment buffer 231. The example shown in FIG. 2 indicates that segments S1, S2, and S3 for three segments are accumulated in the segment buffer 231.

  The movement path correction process executed by the CPU 21 will be described with reference to the flowchart of FIG. 3 and FIGS. In the present embodiment, the case of correcting the movement route shown in FIG. 4 will be described in the first to fourth stages. The movement route in FIG. 4 is a movement route in which the points A1 to A8 are connected by straight lines. A1 to A8 are connected by each segment Si. When the operator operates the operation unit 12, the CPU 21 reads and executes the “movement path correction program” stored in the program storage area 221 (see FIG. 1) of the ROM 221.

  The CPU 21 determines whether or not there is a segment Si to be corrected next based on the machining program stored in the machining program storage area 241 (see FIG. 1) of the flash memory 24 (S11). In order to start correction from now on, the CPU 21 determines that there is a segment Si to be corrected next (S11: YES), and sets the next segment Si at the position of the pointer A (S13).

  The CPU 21 determines whether three segments have been generated from the pointer B (S14). Therefore, the CPU 21 increments the pointer A (S22) until three segments of segment Si are accumulated on the segment buffer 231 (S14: NO), and if there is a next segment (S11: YES), the pointer The next segment is stored in A (S13). As shown in the first stage of FIG. 8, the segment buffer 231 stores segments S1, S2, and S3 for three segments from the pointer B.

  When the CPU 21 determines that three segments have been generated from the pointer B (S14: YES), it determines whether the segment length of the segment S2, which is currently the “second segment”, is equal to or smaller than the first set value (S15). ). When the CPU 21 determines that the segment length of the segment S2 is equal to or smaller than the first set value (S15: YES), the CPU 21 corrects the segment S1 that is the “first segment” and the second segment S2 at this time, The segment S3 which is the “third segment” at this time is deleted, and a new route is created (S16).

  The method for correcting the route connection of the segment Si in S16 will be specifically described. As shown in FIG. 5, the CPU 21 calculates the coordinates of the midpoint T1 of the segment S2, which is the “second segment”, from the coordinates of the start point and the end point of the segment S2. The CPU 21 connects the start point (A1) of the segment S1 and the midpoint T1 of the segment S2 with a new segment S1R. The CPU 21 connects the midpoint T1 of the segment S2 and the end point (A4) of the segment S3 with a new segment S2R. In the present embodiment, “R” means the number of times of correction, “RR” means the number of times of correction, and “RRR” means the number of times of correction. The CPU 21 erases the remaining segment S3. Therefore, as shown in FIG. 5, a new path connecting A1, midpoints T1, and A4 with new segments S1R and S2R is generated (second stage).

  The CPU 21 determines whether or not the segment length of the segment S1R, which is the “first segment” at the present time, is longer than the second set value in the new route shown in FIG. 5 (S17).

  When the CPU 21 determines that the segment length of the segment S1R is equal to or smaller than the second set value (S17: NO), the CPU 21 returns to S11 and determines whether there is a next segment. As shown in the second stage of FIG. 8, the position of the pointer A is empty. When the CPU 21 determines that the next segment Si exists based on the machining program (S11: YES), the CPU 21 sets the next segment S4 at the position of the empty pointer A as shown in “segment reset” in FIG. Set (S13).

  The segment buffer 231 accumulates three segments S1R, S2R, and S4 from the position of the pointer B to the position of the pointer A (see “segment reset” in FIG. 8). Therefore, the CPU 21 determines that three segments have been generated from the pointer B (S14: YES), and determines whether the segment length of the segment S2R, which is the “second segment” at this time, is equal to or smaller than the first set value (S15). ). When the CPU 21 determines that the segment length of the segment S2R shown in FIG. 5 is equal to or smaller than the first set value (S15: YES), the CPU 21 corrects the route again (S16).

  As illustrated in FIG. 6, the CPU 21 calculates the coordinates of the midpoint T2 of the segment S2R that is the “second segment” from the coordinates of the start point and the end point of the segment S2R. The CPU 21 connects the start point (A1) of the segment S1R and the midpoint T2 of the segment S2R with a new segment S1RR. The CPU 21 connects the midpoint T2 of the segment S2R and the end point (A5) of the segment S4 with a new segment S2RR. The CPU 21 erases the remaining segment S4. Therefore, as shown in FIG. 6, a new path connecting A1, midpoints T2 and A5 with new segments S1RR and S2RR is generated (third stage).

  The CPU 21 determines whether or not the segment length of the segment S1RR which is the “first segment” at the present time is longer than the second set value in the new route shown in FIG. 6 (S17).

  When the CPU 21 determines that the segment length of the segment S1RR is equal to or smaller than the second set value (S17: NO), the CPU 21 returns to S11 and determines whether or not there is a next segment Si based on the machining program. As shown in the third stage of FIG. 8, the position of the pointer A is empty. When the CPU 21 determines that the next segment Si is present (S11: YES), the CPU 21 sets the next segment S5 at the position of the empty pointer A as shown in “segment reset” in the upper part of FIG. S13).

  The segment buffer 231 accumulates three segments Si of segments S1RR, S2RR, and S5 from the position of the pointer B to the position of the pointer A (see “segment reset” in the upper part of FIG. 9). Therefore, the CPU 21 determines that three segments have been generated from the pointer B (S14: YES), and determines whether the segment length of the segment S2RR, which is the current second segment, is less than or equal to the first set value (S15). When the CPU 21 determines that the segment length of the segment S2RR shown in FIG. 6 is equal to or smaller than the first set value (S15: YES), the CPU 21 corrects the route again (S16).

  As shown in FIG. 7, the CPU 21 calculates the coordinates of the midpoint T3 of the segment S2RR from the start point and end point of the segment S2RR. The CPU 21 connects the start point of the segment S1RR and the midpoint T3 of the segment S2RR with a new segment S1RRR. The CPU 21 connects the midpoint T3 of the segment S2RR and the end point (A6) of the segment S5 with a new segment S2RRR. The CPU 21 erases the remaining segment S5. Therefore, as shown in FIG. 7, a new path connecting A1, midpoints T3, and A6 with new segments S1RRR and S2RRR is generated (fourth stage).

  The CPU 21 determines whether or not the segment length of the segment S1RR which is the “first segment” at the present time is longer than the second set value in the new route shown in FIG. 7 (S17). The segment S1RR is longer than the first stage in FIG. When the CPU 21 determines that the segment length of the segment S1RRR is longer than the second set value (S17: YES), the CPU 21 determines a route for the segment S1RRR (S18). The segment S1RRR is a path connecting A1 to T3.

  When the path is determined for the “first segment”, the CPU 21 increments the pointer B as shown in “path determination” in FIG. 9 (S19), and returns to S11. In the state where the route is fixed, the position of the pointer A is empty. If the CPU 21 determines that there is a next segment based on the machining program (S11: YES), it sets the next segment S6 at the position of the empty pointer A (S13).

  The CPU 21 determines whether three segments have been generated from the pointer B (S14). The CPU 21 increments the pointer B in S11. Between the pointer B and the pointer A, there are only two segments Si. Therefore, the CPU 21 determines that three segments are not generated from the pointer B (S14: NO), and increments the pointer A (S22). When the CPU 21 determines that the next segment Si is present (S11: YES), the CPU 21 sets the next segment S7 at the position of the empty pointer A as shown in “segment reset” in the lower part of FIG. 9 ( S13). The CPU 21 determines that three segments have been generated from the pointer B (S14: YES), and repeats the process until the end of the path as described above.

  When the CPU 21 determines that there is no next segment Si (S11: NO), the CPU 21 determines whether or not the pointer A is in the same position as the pointer B in the segment buffer 231 (S23). When the CPU 21 determines that the pointer A is not at the same position as the pointer B (S23: NO), the CPU 21 determines the segment at the position of the pointer B (S24) and increments the pointer B (S25). The CPU 21 returns to S23 and determines again whether or not the pointer A is at the same position as the pointer B. When the CPU 21 determines that the pointer A is at the same position as the pointer B (S23: YES), the movement path correction process is terminated.

  If the CPU 21 determines that the segment length of the second segment is longer than the first set value during path correction (S15: NO), the CPU 21 determines the first segment Si (S20). The CPU 21 increments the pointer B (S21), increments the pointer A (S22), returns to S11, and repeats the process.

  That is, when the CPU 21 determines that the segment length of the second segment is longer than the first set value (S15: NO), the CPU 21 determines the path for the first segment (S20). Therefore, since the corrected movement path does not include a minute block, the tool does not decelerate rapidly and a good machining surface can be obtained. If it is determined that the segment length of the first segment after the route correction is longer than the second set value (S17: YES), the route is determined for the first segment (S18). Therefore, when the first segment becomes larger than the predetermined length, the path of the first segment is determined. Therefore, the movement path is corrected one after another by a program in which minute blocks are continuous, and the movement path of the tool is programmed. There is no significant departure from the commanded route.

  As described above, in the numerical control device 1 of the present embodiment, the CPU 21 generates the segment Si constituting the axis movement path in the block order read from the machining program, and sequentially stores it in the segment buffer 231. The CPU 21 sequentially corrects the movement path of the segment Si accumulated in the segment buffer 231 by using three consecutive blocks as the segment to be processed. First, the CPU 21 sets the segments S1, S2, and S3 as processing target segments. When the CPU 21 determines that the segment S2 is longer than the first set value, the CPU 21 determines the path of the segment 1. When the CPU 21 determines that the second segment length is equal to or shorter than the first set value, the CPU 21 corrects the segment S1 and the segment S2, deletes the segment S3, and creates a new path.

  Specifically, the CPU 21 connects the start point of the segment S1 and the midpoint T1 of the segment S2 with the new segment S1R, and connects the midpoint T1 of the segment S2 and the end point of the segment S3 with the new segment S2R. To do. When the CPU 21 determines that the segment S1R is longer than the second set value, the CPU 21 determines the segment S1R. When the CPU 21 determines that the segment S1R is equal to or smaller than the second set value, the CPU 21 adds the next segment to the process target segment. The CPU 21 sequentially determines the first segment while correcting the path again for the three consecutive segments Si to which the processing target segment is added. Therefore, the corrected moving path does not include a minute segment, so that the tool does not decelerate rapidly, a good machining surface can be obtained, and the moving path of the tool is larger than the path commanded by the program. There is no departure.

  In the above description, the CPU 21 that executes the process of S15 corresponds to the “first determination unit” of the present invention, the CPU 21 that executes the process of S20 corresponds to the “first block determination unit” of the present invention, and the process of S16 The CPU 21 that executes the process corresponds to the “correction unit” of the present invention, the CPU 21 that executes the process of S17 corresponds to the “second determination unit” of the present invention, and the CPU 21 that executes the process of S18 The CPU 21 that executes the processes of S19, S21, and S22 corresponds to the “block re-setting unit” of the present invention.

  Needless to say, the numerical control device, the movement path correction method, the movement path correction program, and the storage medium of the present invention are not limited to the above-described embodiment, and various modifications are possible.

1 Numerical control device 2 Machine tool 21 CPU
22 ROM
23 RAM
24 Flash memory 231 Segment buffer

Claims (4)

A movement path of a machine tool composed of a plurality of blocks, three consecutive blocks among the plurality of blocks are moved to a movement start side start block, a movement end side end block, and an intermediate block connecting the start block and the end block In the numerical controller that sequentially corrects the movement path based on the three blocks,
First determination means for determining whether the intermediate block is equal to or shorter than a first predetermined length;
First block determination means for determining the start block as a movement path of the machine tool when the first determination means determines that the intermediate block is longer than the first predetermined length;
When the first determination means determines that the intermediate block is equal to or shorter than the first predetermined length, a block connecting the start point of the start block and the midpoint of the intermediate block is set as a new start block, and the intermediate block Correction means for correcting a block connecting the middle point and the end point of the end block as a new intermediate block;
Second determination means for determining whether or not the new start block corrected by the correction means is longer than a second predetermined length;
Second block determination means for determining the new start block as a movement path of the machine tool when the second determination means determines that the new start block is longer than the second predetermined length;
When the first block determining means determines the moving path of the machine tool, the intermediate block is the start block, the end block is the intermediate block, the block next to the end block is the end block,
When the second block determination means determines the movement path of the machine tool, the new intermediate block is the start block, two blocks that are continuous to the end block are sequentially the intermediate block, the end block,
When the second determination means determines that the new start block is equal to or shorter than the second predetermined length, the new start block is the start block, the new intermediate block is the intermediate block, and the end block is And a block resetting means for resetting the three blocks with the next block as the end block. A movement path of a machine tool composed of a plurality of blocks, three consecutive blocks among the plurality of blocks are moved to a movement start side start block, a movement end side end block, and an intermediate block connecting the start block and the end block In the movement route correction method performed by the numerical controller that sequentially corrects the movement route based on the three blocks,
A first determination step of determining whether the intermediate block is equal to or shorter than a first predetermined length;
A first block determination step for determining the start block as a movement path of the machine tool when it is determined in the first determination step that the intermediate block is longer than the first predetermined length;
When it is determined in the first determination step that the intermediate block is equal to or shorter than the first predetermined length, a block connecting the start point of the start block and the midpoint of the intermediate block is set as a new start block, and the intermediate block A correction step of correcting a block connecting the midpoint and the end point of the end block as a new intermediate block;
A second determination step of determining whether or not the new start block corrected in the correction step is longer than a second predetermined length;
A second block determination step for determining the new start block as a movement path of the machine tool when it is determined in the second determination step that the new start block is longer than the second predetermined length;
When the movement path of the machine tool is determined in the first block determining step, the intermediate block is the start block, the end block is the intermediate block, the block next to the end block is the end block,
When the movement path of the machine tool is determined in the second block determination step, the new intermediate block is set as the start block, and two blocks subsequent to the end block are sequentially set as the intermediate block and the end block,
When it is determined in the second determination step that the new start block is equal to or shorter than the second predetermined length, the new start block is the start block, the new intermediate block is the intermediate block, and the end block is And a block resetting step for resetting the three blocks with the next block as the end block. A movement path of a machine tool composed of a plurality of blocks, three consecutive blocks among the plurality of blocks are moved to a movement start side start block, a movement end side end block, and an intermediate block connecting the start block and the end block In the movement path correction program for controlling the operation of the numerical controller that sequentially corrects the movement path based on the three blocks,
On the computer,
A first determination step of determining whether the intermediate block is equal to or shorter than a first predetermined length;
A first block determination step for determining the start block as a movement path of the machine tool when it is determined in the first determination step that the intermediate block is longer than the first predetermined length;
When it is determined in the first determination step that the intermediate block is equal to or shorter than the first predetermined length, a block connecting the start point of the start block and the midpoint of the intermediate block is set as a new start block, and the intermediate block A correction step of correcting a block connecting the midpoint and the end point of the end block as a new intermediate block;
A second determination step of determining whether or not the new start block corrected in the correction step is longer than a second predetermined length;
A second block determination step for determining the new start block as a movement path of the machine tool when it is determined in the second determination step that the new start block is longer than the second predetermined length;
When the movement path of the machine tool is determined in the first block determining step, the intermediate block is the start block, the end block is the intermediate block, the block next to the end block is the end block,
When the movement path of the machine tool is determined in the second block determination step, the new intermediate block is set as the start block, and two blocks subsequent to the end block are sequentially set as the intermediate block and the end block,
When it is determined in the second determination step that the new start block is equal to or shorter than the second predetermined length, the new start block is the start block, the new intermediate block is the intermediate block, and the end block is And a block resetting step of resetting the three blocks with the next block as the end block.   A storage medium storing the movement route correcting program according to claim 3.

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