JP2010092142A - Automatic programming device and controller for nc machine equipped with the same - Google Patents

Abstract

An automatic programming device capable of easily and efficiently generating an NC program capable of shortening a machining time while maintaining a certain machining accuracy is provided.
An automatic programming device for an NC machine tool that moves a tool along a tool movement curve set according to a machining mode at a corner portion of a linear movement path based on an operation command. A tool that is configured to generate an NC program and has an arcuate tool movement curve corresponding to the input machining mode at each corner of the offset shape that is offset outward from the finish shape of the workpiece by the finish allowance. A machining mode determination unit 26 that generates a machining trajectory obtained by movement and confirms whether or not it intersects with the finished shape, and determines that the inputted machining mode is a machining mode to be output when it does not intersect, and an output A program generation unit 25 for generating an NC program including a command for specifying the processed mode.
[Selection] Figure 1

Description

  The present invention relates to an automatic programming apparatus that interactively generates an NC program for controlling an NC machine tool, and a control apparatus that includes the automatic programming apparatus and controls the NC machine tool.

  In the field of machining, improvement of machining efficiency has been conventionally demanded. For example, a machine tool that moves by changing a movement path when a fast-forward operation command is continuous when relatively moving a tool and a workpiece. Has been proposed (see JP-A-6-180605).

  This fast-forward control device analyzes a NC program for each block and extracts an operation command related to a feed mechanism unit, and executes a program that outputs a control signal for executing the operation command extracted by the program analysis unit Based on the control signal obtained from the control unit and the program execution control unit, the acceleration / deceleration control unit that controls the operation of the feed mechanism unit that relatively moves the tool and the workpiece, and the rapid feed operation command are continuous, the tool is A path change control unit that transmits an execution start signal of a fast-forward operation related to the next block to the program execution control unit when moving to a certain position by fast-forwarding is provided.

  The path change control unit checks whether or not the fast-forward operation command is continuous based on the operation command extracted by the program analysis unit. When the movement position of the tool moving at a rapid feed based on the command and the movement position obtained from the acceleration / deceleration control unit exceeds the path change start point included in the operation command, the execution start signal is sent to the program execution control unit. When the program execution control unit receives the execution start signal from the path change control unit, the program execution control unit outputs a control signal based on the operation command related to the next block to the acceleration / deceleration control unit, and the acceleration / deceleration control unit Causes the block to fast forward.

  In this rapid traverse control device, when the movement position of the tool moving by rapid traverse based on the operation command of the preceding block exceeds the path change start point, the rapid traverse operation related to the next block is started, so that the rapid traverse time is shortened. Figured.

JP-A-6-180605

  By the way, the processing time can be shortened even if the tool is moved as described above at the time of cutting feed, not at the time of rapid feed as described above. However, as shown in FIG. 19, for example, when the movement paths L1 and L2 of the tool T are set and the outer peripheral portion of the workpiece W is machined so that a certain finishing allowance remains, the preceding block as described above. If the tool T is moved based on the operation command of the next block before reaching the target movement position Q based on the operation command, the workpiece W is cut by the amount that the tool T approaches the corner side of the workpiece W. Therefore, depending on the size of the finishing allowance and the position where the next block is started, the shape after finishing is processed, and the processing accuracy is lowered.

  Therefore, it is necessary to control the movement of the tool so as not to process the workpiece too much. For this purpose, the operator must confirm that the workpiece is not processed excessively by calculating the movement path of the tool in advance. An NC program has to be created, making it complicated and difficult, and the NC program cannot be created efficiently. In addition, since the movement path of the tool cannot be simply calculated, if the execution timing of the operation command related to the next block is delayed for safety reasons, the machining time cannot be effectively shortened.

  The present invention has been made in view of the above circumstances, and an automatic programming device capable of easily and efficiently generating an NC program capable of reducing machining time while maintaining a certain machining accuracy, An object of the present invention is to provide a control device for an NC machine tool including the same.

To achieve the above object, the present invention provides:
A feed mechanism unit that relatively moves a tool and a workpiece in a two-dimensional plane, and a control device that controls the feed mechanism unit based on an NC program, wherein the NC program is sequentially analyzed for each block, and the feed mechanism Extracted by the program analysis unit, and a program analysis unit for extracting a command for designating a machining mode divided into a plurality of grades according to how much priority is given to the machining time A drive control signal that generates a drive control signal based on the operation command and a command for designating the machining mode, and a drive control unit that controls the operation by transmitting the generated drive control signal to the feed mechanism unit, The drive control unit, when the machining mode designation command extracted by the program analysis unit is a command for designating a machining mode other than the lowest grade, Based on the motion command extracted by the program analysis unit, it recognizes the motion command related to cutting feed and linear movement, recognizes the corner of the linear movement path along which the tool moves by cutting feed, and for the recognized corner, An arcuate tool movement curve that is in contact with the linear movement path at a position farther from the corner corresponding to the machining mode according to the machining mode designation command and higher in grade is set along the set tool movement curve. An apparatus for interactively generating an NC program used in an NC machine tool comprising a controller configured to generate a drive control signal for moving a tool and a workpiece,
A data receiving unit for receiving input data relating to at least a two-dimensional finishing shape, a finishing allowance, a tool used, and a machining process, which are input from the outside;
Based on the input data received by the data receiving unit, the offset shape obtained by offset outward from the finishing shape by the finishing allowance, or the moving path and feed speed of the tool used to move along the finishing shape A program generation unit that generates at least tool path data including an NC program;
The program generation unit includes a machining mode determination unit that determines the machining mode, and is configured to generate an NC program including a command for designating the machining mode determined by the machining mode determination unit,
The machining mode determination unit first checks whether the machining process received by the data receiving unit is other than finishing, and if it is finishing, determines the lowest grade machining mode. On the other hand, when the processing mode is to be other than finishing processing, an offset shape obtained by offsetting the finishing shape from the finishing shape to the outside based on the input data received by the data receiving unit. For each corner, a machining trajectory in contact with the offset shape, the machining trajectory obtained if the tool used moves along an arcuate tool movement curve corresponding to the machining mode according to the machining process. Generate and check whether the generated machining trajectory intersects with the finished shape, and when it is determined that it does not intersect, the machining mode corresponding to the machining process should be determined. It is configured to the processing mode according to the automatic programming apparatus according to claim.

  According to this automatic programming device, first, input data input from the outside is received by the data receiving unit. This input data includes at least data related to the workpiece's two-dimensional finishing shape, finishing allowance, tool used, and machining process. In addition to this, for example, the material shape (the shape before machining the workpiece), the feed rate, etc. It may be included. The two-dimensional finish shape of the workpiece is a shape on a plane parallel to the plane on which the tool and the workpiece move relatively. In addition, examples of the machining process include rough machining, intermediate finishing, and finishing.

  Next, based on the input data received by the data receiving unit, the program generation unit moves the tool along the offset shape or the finishing shape that is obtained by offsetting the finishing shape outward by the finishing allowance. Tool path data including at least the feed speed is generated, and an NC program is generated based on the generated tool path data. At this time, the machining mode determined by the machining mode determination unit is specified as follows. An NC program including a command for performing is generated.

  That is, the processing mode determination unit first checks whether the processing process received by the data reception unit is other than finishing processing, and if it is finishing processing, the processing mode of the lowest grade is determined. The processing mode to be performed. On the other hand, in the case of other than finishing, based on the input data received by the data receiving unit, each offset corner obtained by offset outward from the finishing shape by the finishing allowance is converted into the offset shape. A machining trajectory that is in contact with each other and is generated when the tool used moves along an arcuate tool movement curve corresponding to the machining mode corresponding to the machining process. Is confirmed to intersect with the finished shape, and when it is determined not to intersect, the machining mode corresponding to the machining process is determined as the machining mode to be determined. Whether or not the machining trajectory intersects with the finished shape can be determined, for example, by determining whether or not the machining trajectory and the shape line of the finished shape have an intersection, and when there is an intersection. The processing locus is a locus obtained by connecting a contact portion (cutting portion) between the workpiece and the tool used.

  The processing mode is divided into multiple grades depending on how much priority is given to machining time. For example, the higher the grade the machining time is given priority (shorter). Therefore, the grade becomes lower in the order of roughing, intermediate finishing and finishing.

  As described above, according to the automatic programming device of the present invention, it is confirmed whether or not the machining trajectory in the machining mode corresponding to the accepted machining process is generated at the corner portion of the offset shape and intersects with the finished shape of the workpiece. If the machining mode to be determined is determined to be a machining mode corresponding to the accepted machining process and an NC program including a command for designating the decided machining mode is generated, the operator can generate an NC program. Even if the tool movement path is not calculated, it is possible to automatically determine a machining mode that does not machine the workpiece excessively, and to generate an NC program for controlling the feed mechanism unit in this determined machining mode. Therefore, it is possible to easily and efficiently generate an NC program that can shorten the machining time while maintaining a certain machining accuracy.

  The data receiving unit is configured to receive data relating to a machining mode instead of data relating to a machining process, and the machining mode determining unit first has the lowest machining mode received by the data receiving unit. Check whether it is the machining mode of the grade, and if it is the machining mode of the lowest grade, the machining mode of this lowest grade is set as the machining mode to be determined, while the lowest grade of the machining mode is determined. When the processing mode is other than the offset shape for each corner portion of the offset shape obtained by offset outward from the finishing shape by the finishing allowance based on the input data received by the data receiving unit. Suppose that the tool used moves along an arcuate tool movement curve corresponding to the accepted machining mode. If the generated machining trajectory is generated and the generated machining trajectory intersects with the finished shape, the accepted machining mode is determined as the machining mode to be determined. It may be configured as follows.

  Further, when the machining mode determination unit determines that the generated tool movement curve intersects with the finished shape, the machining mode is lowered by one grade, and the arcuate tool movement curve corresponding to the machining mode of the grade is followed. The machining trajectory of the tool used may be sequentially generated to recognize a machining mode that does not intersect with the finished shape, and the recognized machining mode may be set as a machining mode to be determined.

  In this way, when the machining mode determining unit determines that the machining mode intersects, the machining mode is lowered by one grade and the machining trajectory in the machining mode is sequentially generated, and the machining trajectory does not intersect with the finished shape. Therefore, the optimum machining mode capable of shortening the machining time as much as possible within a range where the workpiece is not overworked can be determined easily and efficiently.

  The automatic programming device further includes screen display means for displaying an image, and when the machining mode determination unit determines that the generated machining trajectory intersects the finishing shape, the automatic programming device displays the intersecting portion. Is generated and displayed on the screen display means, and a machining locus of the tool used is generated along an arcuate tool movement curve corresponding to a machining mode re-input from the outside and accepted by the data receiving unit. It is also possible to confirm whether or not the finish shape intersects, and when it is determined that the finish shape does not intersect, the machining mode to be determined may be configured as the machining mode related to the re-input.

  In this way, the processing mode determination unit generates the image data for displaying the portion where the generated processing trajectory and the finished shape intersect and is displayed on the screen display means. Conveniently, it is possible to confirm through the display image whether the machining trajectory and the finished shape intersect each other. Further, the operator can re-specify the processing mode when intersecting.

The present invention also provides:
A control device that is provided in an NC machine tool having a feed mechanism that relatively moves a tool and a workpiece in a two-dimensional plane and controls the feed mechanism based on an NC program,
The automatic programming device;
A program storage unit for storing the NC program generated by the automatic programming device;
A program analysis unit that sequentially analyzes the NC program stored in the program storage unit for each block, and extracts an operation command related to the feed mechanism unit and a command for designating the machining mode;
Drive that generates a drive control signal based on the operation command extracted by the program analysis unit and a command for designating the machining mode, and transmits the generated drive control signal to the feed mechanism unit to control its operation A control unit,
The drive control unit performs cutting based on the operation command extracted by the program analysis unit when the processing mode specification command extracted by the program analysis unit is a command for specifying a processing mode other than the lowest grade. Recognizing an operation command related to feed and linear movement and recognizing a corner portion of a linear movement path along which the tool moves by cutting feed, the recognized corner portion corresponds to the machining mode according to the machining mode designation command and is graded. As the tool height increases, an arcuate tool movement curve that contacts the linear movement path is set at a position farther from the corner, and a drive control signal is generated so that the tool and workpiece move along the set tool movement curve. The present invention relates to a control device for an NC machine tool.

  According to this NC machine tool control device, the NC program generated by the automatic programming device is stored in the program storage unit, and the NC program in the program storage unit is sequentially analyzed for each block by the program analysis unit, and the feed mechanism An operation command related to the part and a command for designating the machining mode are extracted.

  Then, the drive control unit generates a drive control signal based on the operation command extracted by the program analysis unit, and the generated drive control signal is transmitted to the feed mechanism unit, whereby the tool and the workpiece move relative to each other. At this time, if the machining mode designation command extracted by the program analysis unit is a command for designating a machining mode other than the lowest grade, cutting feed based on the operation command analyzed by the program analysis unit and An operation command related to linear movement is recognized, and a corner portion of a linear movement path along which the tool moves by cutting feed is recognized, and the recognized corner portion corresponds to the machining mode related to the machining mode designation command and has a high grade. An arcuate tool movement curve that is in contact with the linear movement path at a position far from the corner is set, and the tool is moved along the set tool movement curve. Drive control signals such as fine work to move is generated, actuation of the drive mechanism is controlled by the driving control signal.

  Thus, according to the control device for an NC machine tool according to the present invention, the higher the machining mode grade is, the farther from the corner of the linear movement path, the higher the machining mode grade corresponds to the machining mode designation command in the NC program. The tool and workpiece can be moved relative to each other along an arcuate tool movement curve that touches the linear movement path at a position, that is, a curve whose cutting distance becomes longer as the grade of the machining mode becomes higher. The workpiece can be machined while maintaining a certain machining accuracy and shortening the machining time.

  As described above, according to the automatic programming device and the NC machine tool control device according to the present invention, it is possible to easily and efficiently generate an NC program capable of shortening the machining time while maintaining a certain machining accuracy. By using the NC program generated in this way, it is possible to machine a workpiece in a shorter time while maintaining a constant machining accuracy.

  Hereinafter, specific embodiments of the present invention will be described with reference to the accompanying drawings. FIG. 1 is a block diagram showing a schematic configuration of an NC machine tool control device and the like according to an embodiment of the present invention.

  As shown in FIG. 1, a control device (hereinafter simply referred to as “control device”) 1 of the NC machine tool of this example includes a program storage unit 11, a machining mode storage unit 12, a parameter storage unit 13, and a program analysis unit. 14, an analysis result storage unit 15, a machining mode setting unit 16 and a drive control unit 17, and an automatic programming including an input device 21, a screen display device 22, an input data reception unit 23, an input data storage unit 24, and a program generation unit 25 For example, as shown in FIG. 2, the apparatus 5 is provided in an NC machine tool including a feed mechanism unit 30 that moves the tool T with respect to the workpiece W at least in the X-axis-Y-axis plane. The operation of the lever feeding mechanism 30 is controlled. The machining mode storage unit 12, the machining mode setting unit 16, and the drive control unit 17 correspond to a drive control unit in the claims.

  The program storage unit 11 stores an NC program generated by the automatic programming device 5. The machining mode storage unit 12 stores a current set value set as a machining mode when the tool T is moved with respect to the workpiece W. The parameter storage unit 13 stores acceleration / deceleration parameters set according to the machining mode for each machining mode. The processing mode relates to how much processing time is prioritized when performing processing, and is divided into a plurality of grades depending on the priority of processing time. In this machining mode, for example, the grade is set higher as the machining time is prioritized (shorter), and the grade is set lower as the machining accuracy is prioritized (machining time becomes longer).

  The program analysis unit 14 sequentially analyzes the NC program stored in the program storage unit 11 for each block, and specifies an operation command and a machining mode related to the moving position and feed speed of the tool T, the rotation speed of the tool T, and the like. A command (machining mode designation command) for performing the extraction is extracted, and the extracted command is stored in the analysis result storage unit 15.

  Based on the machining mode designation command stored in the analysis result storage unit 15, the machining mode setting unit 16 includes the machining mode related to this command and the machining mode (current set value) stored in the machining mode storage unit 12. Are matched, and if they do not match, the processing mode in the processing mode storage unit 12 is changed and updated to the processing mode according to the designation command.

  The drive control unit 17 moves the tool T by controlling the operation of the feed mechanism unit 30 based on the operation command stored in the analysis result storage unit 15. Specifically, a drive control signal is generated based on the operation command and current position data fed back from the feed mechanism unit 30, and the generated drive control signal is transmitted to the feed mechanism unit 30 to control it. If the current setting value of the machining mode is confirmed based on the machining mode stored in the machining mode storage unit 12 and it is determined that a machining mode other than the lowest grade is set, the drive control signal is When generating, the operation command related to the cutting feed and linear movement is recognized based on the operation command, and the corner and corner of the linear movement path along which the tool T moves by the cutting feed is recognized, and the recognized corner and corner are recognized. For the part, an arcuate tool movement curve that is in contact with each linear movement path at a position farther from the corner and corner corresponding to the current setting value of the machining mode and higher in grade is set. Performs a process of generating a drive control signal, such as the tool T is moved a along the tool movement curve.

  The tool movement curve is set based on, for example, the acceleration / deceleration parameters stored in the parameter storage unit 13 and corresponding to the current setting value of the machining mode and the feed speed related to the linear movement. Can do. For example, as shown in FIGS. 3 and 4, when the tool T moves along the linear movement paths L1 and L2, the acceleration / deceleration time in the vicinity of the corner P of the linear movement paths L1 and L2 is reduced to T1 and T2. If the feed speed when switching from acceleration to V1 is V1, V2, the deceleration time from the cutting feed speed V to the switching speed V1, V2, and the acceleration time from the switching speed V1, V2 to the cutting feed speed V are equal, The distances D1 and D2 between the portion P and the deceleration start points P1 and P2 are obtained by the following equations (Equations 1 and 2), and the distance D3 between the corner portion P and the acceleration end points P3 and P4. D4 is equal to D1 and D2, respectively. The acceleration / deceleration times T1 and T2 and the switching speeds V1 and V2 are acceleration / deceleration parameters stored in the parameter storage unit 13.

(Equation 1)
D1 = D3 = ((T1 / 2) × V1) / 2

(Equation 2)
D2 = D4 = ((T2 / 2) × V2) / 2

  Based on the distances D1 (D3) and D2 (D4) thus determined, arcs having radii D1 and D2 in contact with the linear movement paths L1 and L2 are set, and this arc is used as a tool movement curve. 3 and 4, two tool movement curves are shown. This is to show a tool movement curve when acceleration / deceleration parameters are different, and only one tool movement curve is actually generated. is there. Further, a tool movement curve having a large radius such as the radius D1 is an example of a tool movement curve set when the grade of the machining mode is high, and a tool movement curve having a small radius such as the radius D2 is the machining. An example of the tool movement curve set when the mode grade is low is shown.

  Further, as described above, the radius of the tool movement curve changes stepwise as shown in FIG. 5, for example, in addition to the arc-shaped tool movement curve having a larger radius as the radius is constant and the machining mode grade is higher. It may be something like that. In the illustrated example, the radius gradually decreases toward the intermediate angle position of the corner, and after passing the intermediate angle position, the radius gradually increases from the intermediate angle position. Such a trajectory is gradually decelerated from a predetermined speed so that the feed speed becomes the slowest at the intermediate angular position of the corner, and after passing through this intermediate angular position, this intermediate angular position is set to the predetermined speed. It is because it is gradually accelerated from. In FIG. 5, D5 = D10, D6 = D9, D7 = D8, the arc of radius D6 (D9) is inscribed in the arc of radius D5 (D10), and the arc of radius D7 (D8) is radius D6 ( It is inscribed in the arc of D9).

  The input device 21 is for inputting various data and signals, and the screen display device 22 is for displaying various images.

  The input data receiving unit 23 is, for example, a workpiece finishing shape in the X-axis / Y-axis plane (a workpiece shape obtained after finishing), or a material shape in the X-axis / Y-axis plane (a shape before processing the workpiece). ), Accepting input data input in an interactive manner via the input device 21 and the screen display device 22 with respect to machining conditions such as finishing allowance, feed speed and spindle rotation speed, tool information used, etc. Processing to be stored in the data storage unit 24 is performed. The method for inputting the finishing shape and material shape and the data format for storing the input finishing shape and material shape are not particularly limited.

  For example, as shown in FIGS. 6A, 6B, and 6C, the used tool information includes a tool name, a tool diameter, and a machining process when the tool is used (for example, rough machining, intermediate finishing). And at least data related to the type and processing mode. FIG. 7 shows the processing mode selection screen displayed on the screen display device 22, but as shown in FIG. 7, it is divided into four grades R1 to R4, giving priority to the processing time. The grade is set higher. When the machining mode is automatically determined, “automatic determination” is displayed in the column of the machining mode. Further, the machining mode R1 corresponds to rough machining, the machining mode R2 or R3 corresponds to medium finishing, and the machining mode R4 corresponds to finishing.

  The program generation unit 25 includes a machining mode determination unit 26, and follows an offset shape obtained by offsetting the finishing shape from the finishing shape to the outside based on the input data stored in the input data storage unit 24. The movement path of the tool used to move (for example, when a finishing allowance is set for roughing or intermediate finishing), or the movement path of the tool used for moving along the finishing shape (for example, finishing allowance for finishing machining) Tool path data including at least the feed speed of the tool used, and the machining mode determination unit 26 determines the machining mode, and the generated tool path data and machining mode determination unit 26 Based on the determined machining mode, an NC program including a command for designating the determined machining mode is generated, and the generated NC program is It performs processing for storing the ram storage unit 11.

  Based on the input data stored in the input data storage unit 24, the processing mode determination unit 26 performs a series of processes as shown in FIGS. 8 to 11 to determine the processing mode, and the determined processing mode is programmed. The data is output to the generation unit 25.

  That is, the machining mode determination unit 26 first recognizes the tool used from the tool information used (step S1), and checks whether the machining mode of the recognized tool used is automatically determined (step S2). If it is determined that it is automatic determination, the finished shape of the workpiece is recognized (step S3), and the machining process, that is, rough machining, intermediate finishing machining, or finishing machining is performed from the tool information used. Is recognized (step S4).

  Next, after confirming whether or not the recognized machining process is rough machining (step S5), if it is determined that it is rough machining, the finishing allowance is recognized, for example, as shown in FIG. An offset shape obtained by offsetting from the finish shape of the workpiece outward by the finish allowance is generated (step S6).

  Next, the acceleration / deceleration parameter in the machining mode corresponding to the machining process, that is, the machining mode R1 corresponding to the rough machining, and the input feed speed are recognized (step S7), and the recognized acceleration / deceleration parameter and Based on the feed speed, as shown in FIG. 13, the generated offset shape has a machining locus C in contact with the offset shape at the corner and corner, and the tool used by the drive control unit 17 is the machining mode R <b> 1. If it moves along the arcuate tool movement curve set corresponding to, a machining locus obtained is generated (step S8).

  This machining trajectory can be generated in the same manner as the tool movement curve in the drive control unit 17. For example, as shown in FIGS. 3 and 14, it is assumed that the tool T used moves along an offset shape. The acceleration / deceleration time in the vicinity of the corner P of the center position of the tool T used is T1, T2, the feed speed when switching from deceleration to acceleration is V1, V2, and the cutting feed speed V to the switching speed V1, V2. Assuming that the deceleration time and the acceleration time from the switching speed V1, V2 to the cutting feed speed V are equal, the distances D1, D2 between the corner portion P and the deceleration start points P1, P2 are expressed by the above formulas (Equations 1, 2). ).

  Based on the distances D1 (D3) and D2 (D4) thus determined, arcs having radii D1 and D2 in contact with the locus of the center position of the tool T to be used are set. The machining locus is calculated from Note that FIG. 14 shows two tool movement curves and machining trajectories. This is to show the tool movement curves and machining trajectories when the acceleration / deceleration parameters are different, and the machining actually generated in step S8. There is one locus. Although not particularly shown, when the drive control unit 17 sets a tool movement curve as shown in FIG. 5, a machining locus corresponding to the tool movement curve is generated.

  Thereafter, in step S9, it is confirmed whether or not the generated machining trajectory and the finished shape intersect. For example, as shown in FIG. 13, when no machining locus C intersects the finished shape, the machining mode R1 corresponding to the rough machining is set as the machining mode to be determined, and this is output to the program generation unit 25. (Step S10), a series of processing is completed. On the other hand, as shown in FIG. 15, for example, when even one machining locus C intersects the finished shape, the grade is higher than the machining mode R1. The acceleration / deceleration parameter corresponding to the low machining mode is recognized (step S11), and the process proceeds to step S15 described later. Note that whether the processing mode R2 or R3 is selected is set by a parameter. Whether the machining trajectory intersects with the finishing shape can be determined, for example, by determining whether the machining trajectory and the shape line of the finishing shape have an intersection, and when there is an intersection.

  If it is determined in step S5 that the machining process is not rough machining, it is checked whether or not the recognized machining process is a medium finishing process (step S12). In the same manner as described above, after generating an offset shape obtained by offsetting from the finished shape of the workpiece outward by the finishing allowance (step S13), the machining mode corresponding to the machining process, that is, the intermediate finish machining is performed. The acceleration / deceleration parameter in the machining mode R2 or R3 (which is set by the parameter) and the feed speed related to the input are recognized (step S14).

  In step S15, in the same manner as described above, a machining locus is generated at the corners and corners of the generated offset shape, and it is confirmed whether or not the generated machining locus and the finished shape intersect (step S15). S16) If it is determined that they do not intersect, the machining mode to be determined is the machining mode R2 or R3 having a lower grade than the machining mode R1, or the machining mode R2 or R3 corresponding to the intermediate finish machining. Is output to the program generation unit 25 (step S17), and a series of processing ends. On the other hand, if it is determined that it intersects the finished shape, the process proceeds to step S18 described later.

  If it is determined in step S12 that the machining process is not intermediate finishing, it is determined that the recognized machining process is a finishing process, and the machining mode corresponding to this machining process, that is, the machining mode R4 corresponding to the finishing process is set. Alternatively, if it is determined in step S16 that they intersect, the machining mode R4 having a lower grade than the machining mode R2 or R3 is set as the machining mode to be determined, and this is output to the program generation unit 25. (Step S18), and a series of processing is completed.

  If it is determined in step S2 that it is not automatically determined, the finished shape of the workpiece is recognized (step S19), the recognized machining mode of the tool used is recognized (step S20), and the machining mode to be determined. When the recognized machining mode is tentatively determined (step S21), then it is confirmed whether or not the tentatively determined machining mode is the machining mode R4 (step S22), and the machining mode R4 is determined. The process proceeds to step S27 described later.

  On the other hand, if it is determined that the machining mode is not R4, the finishing allowance is recognized, and an offset shape obtained by offsetting from the finishing shape of the workpiece outward by the finishing allowance is generated in the same manner as described above (step S23). ) Recognizes the acceleration / deceleration parameters in the temporarily determined machining mode and the input feed speed (step S24), and generates machining trajectories at the corners and corners of the generated offset shape in the same manner as described above. (Step S25), it is confirmed whether or not the generated machining trajectory and the finished shape intersect (Step S26). When it is determined that they do not intersect, or when it is determined that the processing mode is R4 in step S22, the temporarily determined processing mode is formally determined as the processing mode to be determined, and this is output to the program generation unit 25. (Step S27), and a series of processing is completed.

  On the other hand, if it is determined in step S26 that they intersect, image data for displaying the intersection is generated and displayed on the screen display device 22 (step S28). This image data is displayed on the screen for displaying the finished shape, offset shape, machining locus, etc. of the workpiece, for example, as shown in FIG. 16, blinking or emphasizing the machining locus intersecting with the finishing shape, or as shown in FIG. In addition, two graphic elements connected to the corners where the machining trajectory intersects in the display section showing a list of graphic elements (line segments, arcs, etc.) that make up the finished shape, and these screens are displayed. Are configured to display a message to the effect that they intersect. In addition, as a display mode to be emphasized, for example, a mode in which the display color and the line thickness are made different can be cited.

  Thereafter, regarding the modification of the machining mode, for example, it is confirmed whether or not the automatic correction is performed with reference to a preset parameter or the like (step S29). A processing mode that is one grade lower than the temporarily determined processing mode is provisionally determined as a processing mode to be determined (step S30). Specifically, when the temporarily determined processing mode is the processing mode R1, the processing mode R2 is set. When the temporarily determined processing mode is the processing mode R2, the processing mode R3 is set. The temporarily determined processing mode is the processing mode R3. Is set to the processing mode R4. And it progresses to below-mentioned step S33.

  On the other hand, if it is determined in step S29 that the automatic correction has not been performed, data relating to the machining mode can be re-inputted from the input device 21 via the input data receiving unit 23 and input from the input device 21. Data regarding the machining mode received by the input data receiving unit 23 is received (step S31), and this machining mode is provisionally determined as a machining mode to be determined based on the received data regarding the machining mode (step S32). ).

  In step S33, it is confirmed whether or not the temporarily determined machining mode is the machining mode R4. If it is determined that the machining mode is the machining mode R4, the process proceeds to the step S27 and the subsequent steps. If not, the acceleration / deceleration parameter for the temporarily determined machining mode is recognized (step S34), and the process proceeds to step S25 and subsequent steps.

  According to the control device 1 of the present example configured as described above, the input device 21 and the screen display device are related to the tool usage information such as the workpiece finish shape, material shape, finish allowance, machining conditions, machining process and machining mode. After the input data input in an interactive format via 22 is received by the input data receiving unit 23 and stored in the input data storage unit 24, the program generation unit 25 uses the input data based on the stored input data. The tool path data is generated and an NC program is generated and stored in the program storage unit 11. When the NC program is generated, the machining mode determination unit 26 determines an optimum machining mode based on the input data stored in the input data storage unit 24, and designates the determined machining mode. An NC program including the command is generated.

  When machining is performed using the NC program generated in this way, first, the NC program stored in the program storage unit 27 is sequentially analyzed for each block by the program analysis unit 14 and the feed mechanism unit. 30 operation commands and machining mode designation commands are extracted and stored in the analysis result storage unit 15. Based on the stored machining mode designation commands, the machining mode setting unit 16 performs machining modes in the machining mode storage unit 12. Is changed and updated, and on the basis of the stored operation command, a drive control signal is generated by the drive control unit 17, the feed mechanism unit 30 is controlled, and the tool T moves.

  At that time, the current set value of the machining mode is confirmed by the drive control unit 17, and when this set value is other than the lowest grade machining mode (machining mode R4), based on the operation command. An operation command related to cutting feed and linear movement is recognized, and corners and corners of a linear movement path along which the tool T moves by cutting feed are recognized, and the recognized corners and corners are the current in the machining mode. As the grade is higher, an arcuate tool movement curve that is in contact with the linear movement path is set at a position farther from the corner and the corner, and the tool T moves along the tool movement curve. A drive control signal is generated, and the feed mechanism unit 30 is controlled based on the drive control signal. Such movement of the tool T is shown in FIG. In FIG. 18, the portion indicated by the symbol C is a machining locus.

  Thus, according to the control device 1 of the present example, the machining trajectory in the machining mode corresponding to the machining process in the used tool information or the machining trajectory in the machining mode in the used tool information is converted to the corners and corners of the offset shape. Whether or not it intersects with the finished shape of the workpiece, and if it does not intersect, the machining mode to be output is the machining mode corresponding to the machining process in the tool information used, or in the tool information used Since the NC program including a command for designating the determined machining mode is generated, machining that does not overwork the workpiece even if the operator does not calculate the tool movement path. An NC program for automatically determining the mode and controlling the feed mechanism unit 30 in the determined machining mode can be generated. Therefore, it is possible to easily and efficiently generate an NC program that can shorten the machining time while maintaining a certain machining accuracy.

  If the machining mode determination unit 26 determines that the generated machining trajectory and the finished shape intersect, the machining mode is lowered by one grade and machining of the tool used along the arc-shaped tool movement curve corresponding to the machining mode of that grade. The trajectory is sequentially generated to recognize the machining mode that does not intersect with the finished shape, and the recognized machining mode is set as the machining mode to be determined. Therefore, the machining time is shortened as much as possible within the range that does not overwork the workpiece. The optimum processing mode that can be determined can be determined easily and efficiently.

  Further, when the machining mode determination unit 26 determines that the generated machining trajectory and the finished shape intersect, the image of that part is displayed on the screen display device 22, so that the operator can determine which part the machining locus and the finished shape are. It is convenient because it can be confirmed through the display image whether it intersects.

  Further, based on the machining mode designation command included in the NC program, the current setting value of the machining mode is changed by the machining mode setting unit 16 and the feed mechanism unit 30 is controlled by the drive control unit 17 according to this machining mode. The tool can be moved along the tool movement curve that corresponds to this machining mode and the higher the machining mode grade is, the longer the short-circuit distance is. Therefore, a constant machining accuracy can be maintained without overworking the workpiece. The workpiece can be machined while reducing the machining time.

  As mentioned above, although one Embodiment of this invention was described, the specific aspect which this invention can take is not limited to this at all.

  In the above example, the automatic programming device 5 is provided in the control device 1. However, the present invention is not limited to this and may be configured separately from the control device 1. Moreover, the specific curve shape and calculation method of the tool movement curve and the machining locus are not limited to those described above.

  In the above example, the control device 1 is provided with the processing mode storage unit 12, the processing mode setting unit 16, and the drive control unit 17. However, the present invention is not limited to this, and the processing mode storage unit 12 and the processing mode are not limited thereto. The mode setting unit 16 is omitted, and the drive control unit 17 generates a drive control signal based on the command stored in the analysis result storage unit 15 to control the feed mechanism unit 30, and the machining mode designation command is In the case of a command for designating a machining mode other than the lowest grade, the tool T receives the cutting feed based on the motion command stored in the analysis result storage unit 15 and recognizes the motion command related to the linear movement, and the tool T performs the cutting feed. Recognize the corners and corners of the moving linear movement path, and the recognized corners and corners correspond to the machining mode according to the machining mode designation command and are separated from the corners and corners as the grade is higher. The Set the arcuate tool movement curve in contact with the linear movement path location, it may be configured to generate a driving control signal, such as the tool T and the workpiece is moved along the tool movement curves this setting.

It is the block diagram which showed schematic structure, such as the control apparatus of NC machine tool concerning one Embodiment of this invention. It is explanatory drawing which showed the tool and workpiece | work of the NC machine tool in this embodiment. It is explanatory drawing for demonstrating the setting process of the tool movement curve in a drive control part. It is explanatory drawing for demonstrating the setting process of the tool movement curve in a drive control part. It is explanatory drawing for demonstrating the setting process of the tool movement curve in a drive control part. It is explanatory drawing for demonstrating use tool information. It is explanatory drawing for demonstrating the input of a process mode. It is the flowchart which showed a series of processes in the process mode determination part. It is the flowchart which showed a series of processes in the process mode determination part. It is the flowchart which showed a series of processes in the process mode determination part. It is the flowchart which showed a series of processes in the process mode determination part. It is explanatory drawing for demonstrating the production | generation process of offset shape. It is explanatory drawing for demonstrating the production | generation process of the process locus in a process mode determination part. It is explanatory drawing for demonstrating the production | generation process of the process locus in a process mode determination part. It is explanatory drawing for demonstrating the intersection of a process locus and finishing shape. It is explanatory drawing which showed an example of the image displayed on a screen display apparatus. It is explanatory drawing which showed an example of the image displayed on a screen display apparatus. It is explanatory drawing which showed an example of tool movement. It is explanatory drawing for demonstrating the conventional problem.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 NC machine tool control apparatus 5 Automatic programming apparatus 11 Program memory | storage part 12 Machining mode memory | storage part 13 Parameter memory | storage part 14 Program analysis part 15 Analysis result memory | storage part 16 Machining mode setting part 17 Drive control part 21 Input device 22 Screen display device 23 Input data reception unit 24 Input data storage unit 25 Program generation unit 26 Machining mode determination unit

Claims (5)

A feed mechanism unit that relatively moves a tool and a workpiece in a two-dimensional plane, and a control device that controls the feed mechanism unit based on an NC program, wherein the NC program is sequentially analyzed for each block, and the feed mechanism Extracted by the program analysis unit, and a program analysis unit for extracting a command for designating a machining mode divided into a plurality of grades according to how much priority is given to the machining time A drive control signal that generates a drive control signal based on the operation command and a command for designating the machining mode, and a drive control unit that controls the operation by transmitting the generated drive control signal to the feed mechanism unit, The drive control unit, when the machining mode designation command extracted by the program analysis unit is a command for designating a machining mode other than the lowest grade, Based on the motion command extracted by the program analysis unit, it recognizes the motion command related to cutting feed and linear movement, recognizes the corner of the linear movement path along which the tool moves by cutting feed, and for the recognized corner, An arcuate tool movement curve that is in contact with the linear movement path at a position farther from the corner corresponding to the machining mode according to the machining mode designation command and higher in grade is set along the set tool movement curve. An apparatus for interactively generating an NC program used in an NC machine tool comprising a controller configured to generate a drive control signal for moving a tool and a workpiece,
A data receiving unit for receiving input data relating to at least a two-dimensional finishing shape, a finishing allowance, a tool used, and a machining process, which are input from the outside;
Based on the input data received by the data receiving unit, the offset shape obtained by offset outward from the finishing shape by the finishing allowance, or the moving path and feed speed of the tool used to move along the finishing shape A program generation unit that generates at least tool path data including an NC program;
The program generation unit includes a machining mode determination unit that determines the machining mode, and is configured to generate an NC program including a command for designating the machining mode determined by the machining mode determination unit,
The machining mode determination unit first checks whether the machining process received by the data receiving unit is other than finishing, and if it is finishing, determines the lowest grade machining mode. On the other hand, when the processing mode is to be other than finishing processing, an offset shape obtained by offsetting the finishing shape from the finishing shape to the outside based on the input data received by the data receiving unit. For each corner, a machining trajectory in contact with the offset shape, and a machining trajectory obtained if the tool used moves along an arcuate tool movement curve corresponding to a machining mode according to the machining process. Generate and check whether the generated machining trajectory intersects with the finished shape, and when it is determined that it does not intersect, the machining mode corresponding to the machining process should be determined. Automatic programming apparatus characterized by comprising been configured to process mode. A feed mechanism unit that relatively moves a tool and a workpiece in a two-dimensional plane, and a control device that controls the feed mechanism unit based on an NC program, wherein the NC program is sequentially analyzed for each block, and the feed mechanism Extracted by the program analysis unit, and a program analysis unit for extracting a command for designating a machining mode divided into a plurality of grades according to how much priority is given to the machining time A drive control signal that generates a drive control signal based on the operation command and a command for designating the machining mode, and a drive control unit that controls the operation by transmitting the generated drive control signal to the feed mechanism unit, The drive control unit, when the machining mode designation command extracted by the program analysis unit is a command for designating a machining mode other than the lowest grade, Based on the motion command extracted by the program analysis unit, it recognizes the motion command related to cutting feed and linear movement, recognizes the corner of the linear movement path along which the tool moves by cutting feed, and for the recognized corner, An arcuate tool movement curve that is in contact with the linear movement path at a position farther from the corner corresponding to the machining mode according to the machining mode designation command and higher in grade is set along the set tool movement curve. An apparatus for interactively generating an NC program used in an NC machine tool comprising a controller configured to generate a drive control signal for moving a tool and a workpiece,
A data receiving unit for receiving input data relating to at least a two-dimensional finishing shape, a finishing allowance, a tool used, and a machining mode of the workpiece input from the outside;
Based on the input data received by the data receiving unit, the offset shape obtained by offset outward from the finishing shape by the finishing allowance, or the moving path and feed speed of the tool used to move along the finishing shape A program generation unit that generates at least tool path data including an NC program;
The program generation unit includes a machining mode determination unit that determines the machining mode, and is configured to generate an NC program including a command for designating the machining mode determined by the machining mode determination unit,
The processing mode determination unit first checks whether the processing mode received by the data receiving unit is the lowest grade processing mode, and if it is the lowest grade processing mode, While the machining mode to be determined is the lowest grade machining mode, when the machining mode is other than the lowest grade machining mode, based on the input data received by the data receiving unit, from the finished shape An arc-shaped tool movement curve corresponding to the accepted machining mode, which is a machining locus in contact with the offset shape for each corner of the offset shape obtained by offsetting outward by the finishing allowance. If the movement trajectory is moved, a machining trajectory obtained is generated, whether or not the generated machining trajectory intersects with the finished shape is determined and determined not to intersect. Come to an automatic programming apparatus characterized by comprising been configured to the accepted processing mode processing mode to be determined.   When the machining mode determination unit determines that the generated machining trajectory intersects the finished shape, the machining mode is lowered by one grade, and the tool used along the arcuate tool movement curve corresponding to the machining mode of the grade 3. A machining trajectory is sequentially generated to recognize a machining mode that does not intersect with the finished shape, and the recognized machining mode is set as a machining mode to be determined. The automatic programming device described. Screen display means for displaying an image;
When the processing mode determination unit determines that the generated processing trajectory intersects with the finished shape, the processing mode determination unit generates image data for displaying the intersecting portion, displays the screen on the screen display unit, and re-appears from the outside. When generating a machining trajectory of the tool to be used along an arcuate tool movement curve corresponding to a machining mode that is input and accepted by the data reception unit, confirming whether or not it intersects the finish shape, and determining that it does not intersect 3. The automatic programming apparatus according to claim 2, wherein the machining mode to be determined is a machining mode related to the re-input. A control device that is provided in an NC machine tool having a feed mechanism that relatively moves a tool and a workpiece in a two-dimensional plane and controls the feed mechanism based on an NC program,
The automatic programming device according to any one of claims 1 to 4,
A program storage unit for storing the NC program generated by the automatic programming device;
A program analysis unit that sequentially analyzes the NC program stored in the program storage unit for each block, and extracts an operation command related to the feed mechanism unit and a command for designating the machining mode;
Drive that generates a drive control signal based on the operation command extracted by the program analysis unit and a command for designating the machining mode, and transmits the generated drive control signal to the feed mechanism unit to control its operation A control unit,
The drive control unit performs cutting based on the operation command extracted by the program analysis unit when the processing mode specification command extracted by the program analysis unit is a command for specifying a processing mode other than the lowest grade. Recognizing an operation command related to feed and linear movement and recognizing a corner portion of a linear movement path along which the tool moves by cutting feed, the recognized corner portion corresponds to the machining mode according to the machining mode designation command and is graded. As the tool height increases, an arcuate tool movement curve that contacts the linear movement path is set at a position farther from the corner, and a drive control signal is generated so that the tool and workpiece move along the set tool movement curve. A control device for an NC machine tool, characterized in that it is configured to do so.

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