JP2017041041A - Processing data generation apparatus and processing data generation program - Google Patents

Abstract

A machining data generation device and a machining data generation program for generating machining data for obtaining an optimum machining speed with a machining time shortened as much as possible are provided.
An axis control data generating unit generates axis control data including a moving speed of each control axis for moving a tool relative to a workpiece in accordance with the acceleration / deceleration capability of the processing machine. The processing speed up to the reference processing speed is divided into a plurality of speed sections, and the frequent time section acquisition unit 18 occupies the processing time when processing is performed at the combined speed corresponding to each speed section with respect to the total processing time. The speed section with the highest ratio is acquired as the frequent speed section, and the frequent processing speed section is acquired while correcting the reference machining speed until the determination unit 19 determines that the occupation time ratio of the frequent speed section exceeds the reference occupation time ratio. Repeats the acquisition of frequent speed sections in the unit, and outputs axis control data in which the occupation time ratio exceeds the reference occupation time ratio.
[Selection] Figure 2

Description

  The present invention relates to a machining data generation device and a machining data generation program for moving a tool with respect to a workpiece at an optimum machining speed.

  Generally, a machine tool device is equipped with a numerical control device that controls the relative movement of a tool and a workpiece based on a numerical control program (NC program). In a general numerical control method, tool path data (CL data) is obtained based on position data that can be obtained by analyzing an NC program, and machining is performed along the tool path.

  However, when performing machining according to the NC program using a numerically controlled machine tool, for example, a cutting machine that removes material with respect to the relative movement direction of the rotary tool, it may bother the operator's head. One of them is to determine the value of the processing speed. Generally, in rough machining, the tool manufacturer provides the machining speed and the spindle speed, so the worker is not lost, but in the area of finishing machining, it is often left to the operator's judgment.

  Further, at the time of machining, it is not always possible to move the tool according to the tool trajectory at the feed rate (F value) specified by the NC program. When trying to move the tool relative to the maximum feed rate based on the specified feed rate, there is a risk that the desired machining shape cannot be obtained by deviating from the calculated tool trajectory. The tool moves at a safe command feed speed sufficiently smaller than the feed speed, and the machining time tends to become unnecessarily long.

  Therefore, for example, Patent Document 1 discloses a tool for CL data based on a driving capability data storage unit that stores driving capability data related to the driving capability of a driving unit of a machine tool in advance, and CL data and driving capability data. A control system for a machine tool that can perform machining at a command feed rate closer to the maximum feed rate by generating cutting feed rate data at each part of the path is disclosed.

  On the other hand, there is also a method of setting a machining speed as high as possible without actually reaching the machining speed. In this case, since an appropriate amount of cutting per blade is roughly determined for the tool, it is necessary to increase the rotational speed of the spindle at the same time in order to increase the machining speed.

JP2012-152848A

  However, in order to set the machining speed as large as possible and increase the spindle speed, the spindle or tool life will be shortened, so it is not necessary to increase the command machining speed unnecessarily. . Further, since the surface quality is not adversely affected even if the processing speed is increased more than necessary, it is desirable to perform the processing at an appropriate speed.

  Originally, the specified feed rate should be set in consideration of factors that affect the feed rate, such as the ability of the drive unit to move the tool and workpiece relative to each other, the number of rotations of the tool, and the curvature of the tool path. Thus, it should be possible to increase the processing speed. However, even if a tool path is created based on the NC program in which the feed rate is set and displayed on the display device, the tool may not actually move during machining according to the displayed tool path.

  Therefore, since the operator cannot assume the optimum feed rate from the tool trajectory, the operator still relies heavily on the experience of the operator, and it is not possible for the operator to set a suitable feed rate while considering many factors. This is a cumbersome and difficult task, and there is a risk of setting an inappropriate feed rate. As a result, for the sake of safety, the machining is performed with the set feed speed suppressed to some extent, so there is room for improving the machining speed.

  Accordingly, an object of the present invention is to provide a machining data generation device and a machining data generation program for generating machining data for obtaining an optimum machining speed with a machining time shortened as much as possible.

  The machining data generation device of the present invention obtains a machining speed corresponding to a tool trajectory so that the tool of the processing machine moves with respect to the workpiece at a reference machining speed along a predetermined tool trajectory, and based on the machining speed. Axis control data generation unit that generates axis control data consisting of the movement speed of each control axis at a predetermined time interval, and each speed division in which the machining speed is divided into a plurality of speed sections with the reference machining speed as the maximum A speed section determining unit that determines which speed section belongs to, and a speed section having the highest occupation time ratio of the processing time required for the corresponding processing speed in each speed section with respect to the entire processing time. The frequent speed section acquisition unit to be acquired as a speed section, the processing speed acquisition section to acquire a speed within the range of the frequent speed section as a corrected reference processing speed, and the occupation time ratio of the frequent speed section are determined in advance. A machining data generation device comprising: a determination unit that determines whether or not a reference occupancy time ratio is exceeded; and an axis control data output unit that outputs axis control data, the occupancy time ratio of a frequent speed section If the percentage does not exceed the standard occupation time ratio, the machining speed is obtained again using the corrected standard machining speed as the standard machining speed, and the frequent speed section is obtained.If the occupation speed ratio of the frequent speed section exceeds the standard occupation time ratio, The axis control data is generated and output using the corrected reference machining speed as the reference machining speed.

  The machining data generation program of the present invention obtains a machining speed corresponding to a tool path so that the computer moves along the predetermined tool path at a reference machining speed with respect to the workpiece. Based on the axis control data generation unit that generates axis control data consisting of the movement speed of each control axis at predetermined time intervals, the machining speed is divided into a plurality of speed sections with the reference machining speed as the maximum A speed section determination unit that determines which speed section of each speed section belongs, and a speed that occupies the highest processing time for the processing time required for the corresponding processing speed in each speed section with respect to the entire processing time A frequent speed section acquisition unit that acquires a section as a frequent speed section, a machining speed acquisition section that acquires a speed within the range of the frequent speed section as a modified reference machining speed, and a frequent speed section A machining data generation program that functions as a determination unit that determines whether or not the time ratio exceeds a predetermined reference occupation time ratio and an axis control data output unit that outputs axis control data, and a frequent speed When one occupation time ratio of the section does not exceed the standard occupation time ratio, the machining speed is obtained again using the corrected standard machining speed as the reference machining speed, the frequent speed section is obtained, and the occupation time ratio of the frequent speed section is the standard occupation When the time ratio is exceeded, the axis control data is generated and output using the corrected reference machining speed as the reference machining speed.

  “Axis control data” refers to data for controlling each control axis in order to move the tool position relative to the workpiece, and records the speed of each control axis at predetermined time intervals. Alternatively, the speed of each control axis may be changed at predetermined time intervals using mathematical formulas or the like. However, in the present invention, “axis control data” as data used when simulating the machining speed includes data recorded at a predetermined time interval on the tool path before being distributed to each control axis. Say.

  Further, the “predetermined time interval” may be a constant time interval or a constant time interval as long as it is a predetermined time interval. Specifically, for example, the time interval may be changed according to the speed and the shape of the tool trajectory to be processed.

  The “machining speed corresponding to the tool path” refers to the moving speed of the tool when the tool moves relative to the workpiece on a predetermined tool path by moving each control axis. In particular, in the present invention, the “synthetic speed” may be referred to as the speed in the direction in which the tool relatively moves by combining the moving speeds of the moving bodies of the control axes that simultaneously move the “machining speed corresponding to the tool trajectory”. .

  Moreover, when there are a plurality of peaks in the frequency distribution of the occupation time ratio, the frequent speed section acquisition unit preferably acquires the speed section with the fastest speed among the speed sections in which the peaks appear as the frequent speed section.

  “Peak in frequency distribution of occupation time ratio” means what percentage of the occupation time ratio between each speed section indicates how much the machining time required in each speed section is relative to the total machining time. Whether the curve appears in frequency or not, the curve representing the change in the machining time for each speed section changes from ascending to descending. Therefore, in the present invention, there is a possibility that a plurality of peaks are present instead of the maximum value.

  Further, it is preferable that the machining speed acquisition unit acquires the highest speed among the speeds in the range of the frequent speed section as the corrected reference machining speed.

  In addition, when a different color is assigned to each speed section, and the actual tool movement trajectory is displayed on the display device according to the axis control data generated by the axis control data generation unit, the color assigned corresponding to the speed section May be further provided with a trajectory display control unit that distributes the motion trajectory to display the movement trajectory in a color-coded manner on the display device.

  Furthermore, the axis control data generation unit generates axis control data in which the moving speed of each control axis is determined so that the tool is moved so as not to exceed this maximum acceleration in the part exceeding the maximum acceleration of each axis of the processing machine. What to do is desirable.

  In the machining data generation device of the present invention, the machining speed corresponding to the tool trajectory is obtained so that the tool moves along the predetermined tool trajectory according to the reference machining speed, and the obtained machining speed for each predetermined time interval is obtained. It is determined which speed section corresponds to a plurality of speed sections, and it is assumed that processing is performed at the processing speed at that time, and the occupation time ratio with respect to the entire processing time is equal to or greater than a predetermined ratio By repeating the simulation while changing the reference machining speed so as to specify the speed section to become, it becomes possible to obtain the optimum machining speed without making a difficult judgment by the operator.

  In addition, a different color is assigned to each speed section in which the machining speed is divided into a plurality of speed sections, and a movement trajectory for moving the tool relative to the workpiece corresponding to each speed section is displayed in a color-coded manner on the display device. Thus, the frequency distribution of the speed section can be confirmed visually.

Schematic configuration diagram of processing system Functional block diagram of machining data generator The figure for explaining how to find the division trajectory by dividing the tool trajectory Diagram showing the relationship between division trajectory and machining speed Diagram showing speed change of each axis Figure showing the distribution of processing time of synthesis speed (Part 1) Diagram showing distribution of processing time of synthesis speed (Part 2) Flow chart showing processing flow of machining data generation device Display example showing the speed distribution when the model is machined at the standard machining speed Diagram showing distribution of processing time of synthesis speed (Part 3) Display example showing the speed distribution when the model is machined at the final reference machining speed The figure for demonstrating the method of changing and displaying the color of a movement locus according to a speed area

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a schematic configuration diagram of a machining system provided with a machining data generation apparatus of the present invention.

  The processing system 1 includes a processing data generation device 2 according to the present invention, a processing control device (numerical control device) 3 for controlling a processing machine, and a processing for processing a workpiece with a tool by placing a workpiece (work) on a table. It consists of machine 4. The machining data generation device 2 and the numerical control device 3 are connected by a communication cable 5.

  As shown in FIG. 2, the processing data generation device 2 of the present invention is configured by a computer such as a personal computer or a tablet computer, and a display unit 11 configured by a display device such as a display device such as a liquid crystal display (LCD) device. , An operation unit 12 including a keyboard, a mouse, a touch panel, a storage unit 13 such as a hard disk, and an output unit (axis control data output unit) 22 for transmitting data to the numerical control device 3 are provided. Hereinafter, the display unit will be described as a display device.

  In addition to basic system software such as an operating system, the storage unit 13 is preinstalled with a machining data generation program in addition to application software such as CAM.

  Furthermore, the storage unit 13 stores the physical characteristics of each processing machine such as tool path data such as an NC program representing the tool path generated using the CAM function, the maximum acceleration of the processing machine used for processing, and the maximum jerk. The dependent machine-specific setting values are stored.

  Even if the NC program is generated by using the CAM software in the computer and stored in the storage unit 13, the NC program generated by the computer provided outside or the NC program stored in the external storage is stored. It may be input via a network. Alternatively, the tool path data may be data represented by a parametric curve output from the CAM (or CAD).

  When the machining data generation program stored in the storage unit 13 is executed, the computer functions as the machining data generation device 2 of the present invention. As shown in FIG. 2, the data input unit 15, the axis control data calculation unit 16, functions as a speed section determination unit 17, a frequent speed section acquisition unit 18, a determination unit 19, a repetition control unit 20, a machining speed acquisition unit 21, an axis control data output unit 22, and a trajectory display control unit 23.

  The data input unit 15 uses the graphical user interface to input data selected using the operation unit 12 from a list of data in which tool trajectories such as NC programs displayed on the display device 11 are recorded. Is transferred to the axis control data calculation unit 16. Hereinafter, a case where the tool path is given by the NC program will be described.

  In addition, the data input unit 15 receives the first reference machining speed F input from the operation unit 12 and transfers it to the axis control data calculation unit 16.

  The NC program includes NC codes (G01: linear interpolation, G02 or G03: circular interpolation, etc.), coordinate values of each control axis (X axis, Y axis, Z axis), feed speed (F value, hereinafter) The value of a parameter such as that described as the processing speed is recorded.

  The axis control data calculation unit 16 generates axis control data for controlling each axis of the processing machine so as to move the tool with respect to the workpiece at a given reference processing speed F. A tool trajectory for machining a predetermined machining shape is given by the NC program, and in order to move the tool relative to the workpiece at a speed close to the reference machining speed F along the given tool trajectory, Axis control data is generated in consideration of characteristics (especially acceleration and jerk indicating the limit of acceleration / deceleration). In the machining data generation apparatus according to the embodiment, the axis control data is a record of changes in speed with time. For example, the axis control data includes a relative movement of the tool of the processing machine with respect to the workpiece at predetermined time intervals. The moving speed of each control axis to be recorded is recorded.

  The axis control data calculation unit 16 further includes an NC program decoding unit 30, a tool path generation unit 31, and an axis control data generation unit 32.

  The NC program decoding unit 30 reads the NC program of the file selected by the operator from the storage unit 13, and decodes the read NC program for each program block in order to generate NC data. Of the generated NC data, data defining the shape of the tool trajectory such as NC code and position data related to movement is output to the tool trajectory generating unit 31. NC data related to parameters such as machining conditions is output to the storage unit 13.

  The tool path generation unit 31 analyzes NC data that defines the shape of the tool path obtained by decoding the NC program, for example, the G code and the coordinate value of each axis, and determines the tool path defined by the NC program. Is converted into a parametric curve such as a plurality of NURBS (Non-Uniform Rational B-Spline). The range of the error may be a range determined empirically, and is determined by the processing object, the processing shape, and the like. The tool path represented by the parametric curve is temporarily stored in the storage unit 13.

  The axis control data generation unit 32 converts the tool path L converted into a parametric curve into axis control data using the reference machining speed F. In the calculation for generating the following axis control data, the calculation is performed using the parameters stored in the storage unit 13, and any one of the parameters is previously set by the operator according to the setting of the processing machine that outputs the axis control data. It is selected whether to use parameters for the processing machine. Initially, the axis control data generation unit 32 is executed using the reference machining speed F transferred from the data input unit 15, but each time the repetition control unit 20 repeats the reference machining speed F to a small value. The axis control data generation unit 32 is executed after being changed. Details of the change of the reference processing speed F will be described later.

  First, a divided locus obtained by dividing the tool locus L according to the curvature of the tool locus L converted into a parametric curve is obtained. The processing machine 4 processes the workpiece by moving the processing position of the tool while controlling the speed of each axis between the two specified points. However, in the portion where the curvature of the tool locus L is large, the moment of inertia of the processing machine 4 is processed. There is a portion where it is difficult to move the machining position of the tool along the tool path L due to the influence of rigidity and rigidity. Further, it is preferable that the tool locus L connecting the two points designated to the processing machine 4 does not deviate greatly from the straight line. Therefore, the curvature of the tool path L is obtained, and as shown in FIG. 3, the tool path L is divided at large intervals where the curvature is small, and is divided at small intervals as the curvature increases, and a point P1 on the tool path L is obtained. , P2, P3, P4,..., Pi, Pi + 1, and so on, are divided into a plurality of divided trajectories l1, l2, l3, l4,. For example, the tool trajectory L in the range where the curvature of the tool trajectory is small (the curvature is close to 0) and is a substantially straight line is set as one divided trajectory. That is, where a portion close to a straight line continues, a long-distance tool locus becomes one divided locus l, and where the curvature is large, the divided locus l is generated at short intervals.

  Next, the divided trajectory l (l is l1 when the tool is moved at the designated reference machining speed F along the respective divided trajectories l1, l2, l3, l4,. , L2, l3, l4,..., Li,...), And the movement represented by the time change of the speed of each axis obtained at a predetermined time interval. The axis control data in which the command value is recorded is obtained. The axis control data only needs to include the position of each axis of at least one point on the divided trajectory. For example, if the axis control data records the position of the starting point on the divided trajectory l and the speed change of each axis when moving along the divided trajectory, the speed specified for each axis from the position of the starting point By controlling the respective axes so as to follow the change, the machining position of the tool can be moved along the divided locus l at a combined speed obtained by combining the speed changes of the respective axes.

  In order to machine a workpiece at a designated reference machining speed F along the division trajectory l as shown in FIG. 4, the machining position of the tool is tangentially moved at the reference machining speed F at each position on the division trajectory l. By moving, the machining position of the tool can be moved along the division trajectory l. That is, the reference machining speed F is divided into components X, Y, and Z of each axis of the tangent vector at each position of the divided locus l, the X axis is moved by the velocity component in the X direction from the position of the starting point, and the Y axis is changed to Y. It is possible to move the machining position of the tool along the divided trajectory by controlling the movement with the velocity component in the direction and moving the Z-axis with the velocity component in the Z direction. As shown in FIG. 4, the velocity component of each axis at the start point position P1 on the divided locus l is (V1x, V1y, V1z), and the velocity component of each axis at the end point position P2 is (V2x, V2y, V2z), the speed of each axis is changed from V1x → V2x, V1y → V2y, and V1z → V2z while moving each axis from position P1 to position P2. Further, in order to move the tool along the division locus l, it is necessary to change the speed of each axis at short time intervals so that the traveling direction of the tool is in the tangential direction of the division locus.

  First, as shown in FIG. 5, a speed curve representing a time change of speeds Vx, Vy, and Vz for moving each axis when the tool is moved at the reference machining speed F on each division trajectory l is obtained. FIG. 5 shows a case where there is no movement in the Z direction and there is a movement only in the XY plane. By controlling the speed of each axis so as to follow this speed curve, the machining position can be moved along the division locus l. Therefore, the axis control data records, for example, the speed of each axis at each point obtained by dividing the speed curve of each axis at a short constant time interval Δt and the starting point of the divided locus l.

  Since there is a limit on the maximum acceleration and the maximum jerk of the processing machine 4, there is a place where the processing position of the tool cannot be moved along the divided locus l while maintaining the designated reference processing speed F. Therefore, based on parameters relating to the maximum acceleration and maximum jerk, the curvature of the divided trajectory l at the machining position is large, and when the machining is performed at the reference machining speed F, it is predicted that machining cannot be performed along the divided trajectory l. Then, the speed in each axial direction is determined so as to be smaller than the designated reference machining speed F. Specifically, based on the curvature of the divided locus at each point obtained by dividing the divided locus at the time interval Δt, the acceleration and jerk when the respective axes are moved at the designated reference processing speed F are obtained, and the acceleration And the portion where the jerk exceeds the maximum acceleration or maximum jerk of the processing machine 4 set in the parameters, the moving speed of the machining position is set to a speed smaller than the reference machining speed F, and the maximum acceleration or maximum jerk The axis control data is generated by obtaining the speed in each axis direction so as not to exceed.

  Further, since the integral value of the velocity curve from time T0 to time Tn shown in FIG. 5 is the distance moved from time T0 to time Tn, the position of each axis at time Tn is the starting point P0 of the divided locus l. The position of each axis is obtained by adding an integral value between T0 and Tn of the speed curve.

  Here, a case where the speed of each axis is recorded in the axis control data at a constant time interval Δt will be described, but when there is no change in the speed as when the machining position of the tool is moved on a straight line, It is not necessary to record the speed of each axis in the linear movement section. Also, the time interval may not always be constant, the speed may be recorded at a large time interval in a section with a small curvature, and the speed may be recorded at a small time interval in a section with a large curvature. If the time interval is not constant, the time interval at which the speed is recorded in the axis control data is also recorded. When recording speed at a constant time interval at all times, the speed must be recorded at the smallest time interval so that accuracy can be maintained, but by changing the time interval according to the curvature, , Can reduce the amount of data.

  The axis control data generated for each of the divided trajectories l1, l2, l3, l4,..., Li,. Once stored in the storage unit 13.

  The speed section determination unit 17 sets the machining speed corresponding to the tool trajectory (divided trajectory) to a reference speed F at a plurality of speed sections according to the tangential speed obtained in the process of calculating the axis control data. It is determined which one of the plurality of speed sections when divided into two, and the divided trajectory is further divided according to the speed section to which the machining speed in each divided trajectory belongs. For example, when F10000 mm / min is given as the reference processing speed F, 10 sections (0 to 1000 mm / min, 1000 to 2000 mm / min, 2000 to 3000 mm / min, ..., 8000 to 9000 mm / min, 9000 to 10000 mm) / Min), the speed section is divided, and it is determined to which speed section the machining speed at each position on the divided trajectory of each axis control data belongs.

  The trajectory display control unit 23 assigns a different color to each speed section in which the reference processing speed F is maximized and the processing speed is divided into a plurality of speed sections. The color assigned to the speed section to which the processing speed (composite speed) at each position belongs is distributed to the corresponding movement locus, and the movement locus is displayed in different colors on the display device 11.

  For example, as shown in FIG. 12 (a), Q1 to Q2 of the divided trajectories of Q1 to Q3 are given speeds within a speed interval of 2000 to 3000 mm / min as axis control data, and Q2 to Q3 are axes When the speed in the speed section of 3000 to 4000 mm / min is given by the control data, the partial trajectory of Q1 to Q2 is divided into the partial trajectory before Q2 and the partial trajectory after Q2 of the divided trajectories. Is drawn in blue, and the partial trajectories of Q2 to Q3 are drawn in light blue. Alternatively, as shown in FIG. 12 (b), only a part of the middle Q5 to Q6 of the divided trajectories is given a speed within a speed section of 3000 to 4000 mm / min, and the remaining Q4 to Q5 and Q6 to Q7 are given. When the part is given a speed in the speed interval of 2000 to 3000 mm / min, it is divided into three partial loci, the partial loci of Q5 to Q6 are drawn in light blue, and the remaining Q4 to Q5 and Q6 to Q7 are drawn. The partial locus is drawn in blue. FIG. 12 shows an example of division into partial trajectories belonging to two speed sections, but when there are parts belonging to three or more speed sections, drawing is performed in three or more colors according to the speed sections.

  FIG. 9 shows an example of the movement locus displayed in different colors. FIG. 9A shows the original machining shape, and FIGS. 9B and 9C are examples in which the distribution of the machining speed predicted when machining the original machining shape is displayed in different colors. The darker the part, the faster it is processed. By color-coded display, it is possible to immediately recognize visually by which speed section the speed is distributed.

  The frequent speed section acquisition unit 18 integrates the time during which machining is performed at a processing speed within the range of the speed section for each speed section according to the result determined by the speed section determination unit 17 based on the axis control data. The accumulated time is acquired, and the speed section having the highest occupation time ratio in which the processing is performed at the processing speed corresponding to each speed section is acquired as the frequent speed section with respect to the entire processing time. For example, when F10000 mm / min is given as the reference processing speed F, for example, 10 sections (0 to 1000 mm / min, 1000 to 2000 mm / min, 2000 to 3000 mm / min, ..., 8000 to 9000 mm / min, 9000) The frequent speed section is acquired by dividing into 10000 mm / min). When the machining speed distribution of the machining speed of the axis control data obtained when F10000 mm / min is set as the reference machining speed F is as shown in FIG. 6, it occupies the entire machining time compared to other speed sections. The speed section 3000 to 4000 mm / min with the largest time ratio is the frequent speed section.

  Alternatively, as shown in FIG. 7, when a plurality of speed sections in which a peak of the processing time appears, that is, a plurality of speed sections having a higher occupation time ratio than the two adjacent speed sections before and after, frequent frequency section acquisition is performed. The unit 18 acquires a plurality of speed sections (3000 to 4000 mm / min and 5000 to 6000 mm / min in the example of FIG. 7) as frequent speed sections. When there are a plurality of frequent speed sections, the processing speed acquisition unit 21 acquires the corrected reference processing speed from the faster frequent speed section (5000 to 6000 mm / min in the example of FIG. 7). Specifically, the maximum speed of the faster frequent speed section is set as the corrected reference machining speed (6000 mm / min in the example of FIG. 7).

  It is predicted that the speed in the frequent speed section obtained by using the frequent speed section acquisition unit 18 is close to the machining speed suitable for machining.

  Therefore, the machining speed acquisition unit 21 acquires a corrected reference machining speed for correcting the reference machining speed F from the frequent speed section obtained by the frequent speed section acquisition unit 18. Although it is considered that there is an optimum machining speed in the frequent speed section, it is preferable that the machining time is short. Therefore, the maximum speed in the frequent speed section is set as the corrected reference speed. For example, when the frequent speed section is 3000 to 4000 mm / min, the maximum speed 4000 mm / min in this speed section is set as the corrected reference machining speed. Alternatively, the corrected reference machining speed may not be the maximum speed as long as the value is close to the maximum speed in the frequent speed section.

  Next, the determination unit 19 determines whether or not the occupation time ratio of the frequent speed section acquired by the frequent speed section acquisition unit 18 exceeds a predetermined reference occupation time ratio. It is considered that the optimum machining speed is obtained when the occupation time ratio of the frequent speed section is high to some extent. For example, it is considered that the optimum processing speed is over 80%. The occupation time ratio of the frequent speed section is better to some extent, but if it is close to 100%, it is considered that there is a high possibility that it is below the optimum machining speed in many places. There is a high possibility that the machining speed is optimal within a slightly faster speed zone. Therefore, the reference occupation time ratio is preferably set to around 80%, but may be changed according to the processing machine, workpiece, tool, shape, etc. based on experience.

The repetitive control unit 20 uses the corrected reference machining speed acquired by the machining speed acquisition unit 21 as the reference machining speed F until the determination unit 19 determines that the occupation time ratio of the frequent speed section exceeds the reference occupation time ratio. The control data generating unit 32 generates axis control data, the speed section determining unit 17 determines the speed section of the axis control data, the frequent speed section acquiring unit 18 acquires the frequent speed section, and the machining speed acquiring unit 21 Repeat the process of acquiring the corrected reference machining speed. If the machining data generation device 2 is configured such that the axis control data generation unit 32 generates axis generation data corresponding to the determination result of the determination unit 19, it is not necessary to provide the repetition control unit 20.

  The axis control data output unit 22 uses the corrected reference machining speed acquired by the machining speed acquisition unit 21 when the occupancy time ratio of the frequent speed section exceeds the reference occupation time ratio by the determination unit 19. The axis control data generated at 32 is output to the numerical controller 3 via the communication cable 5.

  Here, an example of the flow of processing for generating the axis control data of the optimum machining speed by the machining data generation device 2 of the machining system 1 will be described with reference to the flowchart of FIG.

  When the machining data generation device 2 is activated, first, the NC program stored in the storage unit 13 is searched, and the program name is displayed on the display device 11. The operator uses the graphical user interface to select from the list of NC program names displayed on the display device 11 using the operation unit 12 (S1). Further, for example, 10000 mm / min is set as the first reference processing speed F using the operation unit 12 (S2). Although the value of the reference machining speed F given initially is arbitrary, the machining speed required as a suitable machining speed does not exceed the reference machining speed F given initially, so that the simulation result is higher than the original optimum machining speed. In order not to reduce the machining speed, a machining speed considerably higher than the machining speed suitable for the machining actually predicted is set. In principle, by setting a large value that is estimated to be surely not exceeded regardless of the machining shape, a faster machining speed closer to the ideal can be obtained. However, even if the initial reference machining speed F is too large and a value that is too large to be related to the maximum number of rotations of the tool is given, there is no particular technical advantage. To decide. According to the machining data generation apparatus of the embodiment, the initial reference machining speed can be given as a fixed value, and it is not necessary for the operator to input after the reference machining speed F is first given. This has the advantage that the burden on the person is reduced.

  The selected NC program is received by the data input unit 15 and transferred to the axis control data calculation unit 16. The axis control data calculation unit 16 decodes the received NC program by the NC program decoding unit 30 and outputs NC codes (G01, G02, G03, etc.) and position data relating to movement to the tool locus generation unit 31. The tool path generation unit 31 converts the tool path into a parametric curve such as NURBS based on the NC code and position data obtained from the NC program. Further, the axis control data generating unit 32 generates axis control data using the parametric curve and the set reference machining speed F (10000 mm / min), and stores it in the storage unit 13 (S3).

  First, the axis control data stored in the storage unit 13 is read in order from the top. Based on the read movement speed of the axis control data, the speed section determination unit 17 determines to which speed section each part on the division trajectory 1 of the axis control data belongs (S4). When the reference processing speed F is 10,000 mm / min, 0 to 1000 mm / min, 1000 to 2000 mm / min, 2000 to 3000 mm / min, 3000 to 4000 mm / min, 4000 to 5000 mm / min, 5000 to 6000 mm / min, It is divided into 10 speed sections of 6000 to 7000 mm / min, 7000 to 8000 mm / min, 8000 to 9000 mm / min, and 9000 to 10000 mm / min, and it is determined which speed section the processing speed enters.

  Further, the trajectory display control unit 23 displays the moving trajectory on the display device 11 by using the color assigned to the corresponding speed section for the divided trajectory 1 (S5). For example, red when the processing speed is 9000 to 10000 mm / min, orange when the processing speed is 8000 to 9000 mm / min, yellow when the processing speed is 7000 to 8000 mm / min, and the composite speed Yellowish green when the speed is 6000 to 7000 mm / min, green when the processing speed is 5000 to 6000 mm / min, blue green when the processing speed is 4000 to 5000 mm / min, and a processing speed of 3000 to 4000 mm / Blue when the processing speed is 2000 to 3000 mm / min, blue purple when the processing speed is 1000 to 2000 mm / min, and when the processing speed is 0 to 1000 mm / min Is assigned purple, and the machining speed is assigned to the corresponding speed section according to the movement trajectory of the tool. For drawing of the trajectory in the temple color. Further, the frequent speed section acquisition unit 18 calculates, as needed, an integrated time obtained by integrating the time during which machining is performed at the speed in the speed section for each speed section in accordance with the determination by the speed section determination unit 17 (S6). .

  The processes of S4 to S6 are repeated until the last axis control data is obtained while reading sequentially from the first axis control data stored in the storage unit 13 (S7-NO). When the processing of S4 to S6 is completed up to the last axis control data (S7-YES), the frequent speed section acquisition unit 18 acquires the speed section having the largest occupation time ratio with respect to the entire machining time as the frequent speed section (S8). .

  FIG. 9B is an example of color-coded display of speed distribution when simulating the axis control data generated by specifying 10000 mm / min as the reference machining speed F in order to machine the original machining shape. In particular, various speeds are distributed over the whole without many specific speed sections appearing.

  When the processing speed is distributed as shown in FIG. 6, the frequent speed section acquired by the frequent speed section acquisition unit 18 is a speed section of 3000 to 4000 mm / min. Therefore, the processing speed acquisition unit 21 acquires the maximum speed 4000 mm / min in the frequent speed section as the corrected reference processing speed (S9).

  The determination unit 19 determines whether or not the occupation time ratio with respect to the entire machining time exceeds 80% (reference occupation time ratio), for example, when machining is performed at a combined speed in the frequent speed section 3000 to 4000 mm / min. (S10). If it does not exceed 80% (S10-NO), the repetitive control unit 20 sets the corrected reference machining speed 4000 mm / min as the reference machining speed F, transfers it to the axis control data generation unit 32, and again receives the axis control data. Generated and stored in the storage unit 13 (S3).

  Again, using the newly generated axis control data, it is determined which speed section the machining speed enters (S4). Since the reference processing speed F is set to 4000 mm / min, 0 to 400 mm / min, 400 to 800 mm / min, 800 to 1200 mm / min, 1200 to 1600 mm / min, 1600 to 2000 mm / min, 2000 to 2400 mm / min , 2400 to 2800 mm / min, 2800 to 3200 mm / min, 3200 to 3600 mm / min, 3600 to 4000 mm / min, and it is determined which speed section the processing speed enters.

  The trajectory display control unit 23 displays the moving trajectory on the display device 11 by color using the color assigned to the speed section (S5). Further, the frequent speed section acquisition unit 18 calculates the accumulated time for each speed section as needed (S6). The processes of S4 to S6 are repeated until the last axis control data (S7). When the combined speed of the axis control data obtained by setting the reference machining speed F to 4000 mm / min is distributed as shown in FIG. 10, the frequent speed section obtained by the frequent speed section acquisition unit 18 at this time is 2800 to 3200 mm / min (S8). The machining speed acquisition unit 21 acquires the maximum speed of 3200 mm / min in the frequent speed section as the corrected reference machining speed (S9). FIG. 9C shows an example of color-coded display of the speed distribution when simulating the axis control data generated by designating the reference machining speed of 4000 mm / min. Compared to the case where 10000 mm / min is designated as the reference processing speed, more medium speed sections appear.

  The determination unit 19 determines whether or not the occupation time ratio with respect to the total machining time exceeds 80% when the machining is performed at the combined speed in the frequent speed section (S10). The repetition control unit 20 repeats the processes from S3 to S10 until the occupation time ratio exceeds 80%.

  As a result of repeated processing, when the axis control data is generated and simulated when the reference machining speed F is 3200 mm / min, the frequent speed section becomes 1280 to 1600 mm / min. When it is determined that the occupation time ratio of the section exceeds 80% (S10-YES), 1600 mm / min is set as the reference machining speed F, and the axis control data generating unit 32 generates axis control data again ( S11).

  The axis control data output unit 22 sets the reference machining speed F to 1600 mm / min and outputs the axis control data generated by the axis control data generation unit 32 to the numerical control device 3 via the communication cable 5 (S12). .

  As described above, when the frequent speed section in which the occupation time ratio exceeds 80% is not the fastest speed section among the plurality of speed sections, the axis control data generation unit 32 uses the maximum speed of the frequent speed section. Axis control data is generated again, but if the speed section where the occupation time ratio exceeds 80% is the fastest speed section among a plurality of speed sections, the axis control data is already at the maximum speed of the frequent speed section. Therefore, the axis control data stored in the storage unit 13 may be output from the axis control data output unit 22 without generating the axis control data again by the axis control data generation unit 32.

  FIG. 11 shows an example in which the velocity distribution when the axis control data to be finally output to the numerical controller 3 is simulated by the simulation unit is displayed in different colors. A lot of dark color (high speed section) speed distribution appears throughout. That is, it can be seen that the whole is processed at a combined speed close to the reference processing speed F. In the flowchart of FIG. 8, when the occupancy time ratio exceeds the reference occupancy time ratio in the determination unit 19, the axis control data is immediately output from the axis control data output unit 22, but a simulation is performed before the output. The axis control data may be output from the axis control data output unit 22 after confirming the velocity distribution.

  When machining is actually performed by the processing machine 4, the number of rotations of the spindle corresponding to the reference processing speed F when the axis control data output to the processing machine 4 is generated is set.

  As explained in detail above, by first setting a high speed as the reference machining speed and performing a simulation, the machining time is gradually lowered to a speed at which the composite speed obtained in the simulation appears frequently. Can be found, and the number of revolutions of the spindle can be determined in accordance with the machining speed. Thereby, since the rotation speed of a tool is not raised more than necessary, a tool can be made lasting longer. In addition, the surface finishing accuracy can be improved by processing at an appropriate processing speed.

  In the above-described embodiment, the trajectory display control unit displays the moving trajectory in different colors according to the combined speed, and finds the optimum processing speed while visually confirming the processing speed distribution. The axis control data having the most suitable machining speed may be automatically generated by gradually lowering the speed to a frequently appearing speed without displaying it in the control unit.

DESCRIPTION OF SYMBOLS 1 Processing system 2 Processing data production | generation apparatus 3 Processing control apparatus 4 Processing machine 5 Communication cable 11 Display part 12 Operation part 13 Storage part 14 Input / output part 15 Data input part 16 Axis control data calculation part 17 Speed area determination part 18 Frequent speed area Acquisition unit 19 Determination unit 20 Repeat control unit 21 Processing speed acquisition unit 22 Axis control data output unit 23 Trajectory display control unit 30 Program decoding unit 31 Tool trajectory generation unit 32 Axis control data generation unit

Claims (6)

A processing speed corresponding to the tool trajectory is obtained so that the tool of the processing machine moves with respect to the workpiece at a reference processing speed along a predetermined tool trajectory, and each predetermined time interval is determined based on the processing speed. An axis control data generation unit that generates axis control data including the moving speed of the control axis;
A speed section determination unit that determines which speed section of each speed section the processing speed is divided into a plurality of speed sections with the reference processing speed as a maximum,
A frequent speed section acquisition unit that acquires a speed section having the highest occupation time ratio of the processing time required for the corresponding processing speed in each speed section as a frequent speed section;
A processing speed acquisition unit for acquiring a speed within the range of the frequent speed section as a corrected reference processing speed;
A determination unit that determines whether an occupation time ratio of the frequent speed section exceeds a predetermined reference occupation time ratio;
An axis control data output unit for outputting the axis control data;
With
When the occupation time ratio of the frequent speed section does not exceed the reference occupation time ratio, the machining speed is obtained again using the corrected reference machining speed as the reference machining speed, the frequent speed section is obtained, and the frequent speed section When the occupation time ratio exceeds the reference occupation time ratio, the machining data generation apparatus generates and outputs the axis control data using the corrected reference machining speed as the reference machining speed.   The frequent speed section acquisition unit, when there are a plurality of peaks in the frequency distribution of the occupation time ratio, acquires the speed section having the fastest speed among the speed sections in which the peak appears as the frequent speed section. The processing data generation device according to claim 1.   The machining data generation apparatus according to claim 1, wherein the machining speed acquisition unit acquires the highest speed among the speeds in the range of the frequent speed section as the corrected reference machining speed.   A different color is assigned to each speed section, and when the movement trajectory of the tool is displayed on a display device in accordance with the axis control data generated by the axis control data generation unit, the assignment is made corresponding to the speed section. The processing data generation apparatus according to claim 1, further comprising a trajectory display control unit that distributes the obtained color to the movement trajectory and displays the movement trajectory in a color-coded manner on a display device.   The axis control data generation unit further determines the moving speed of each control axis so as to move the tool so as not to exceed the maximum acceleration in a portion exceeding the maximum acceleration of each axis of the processing machine. The machining data generation apparatus according to claim 1, wherein axis control data is generated. Computer
A processing speed corresponding to the tool trajectory is obtained so that the tool of the processing machine moves with respect to the workpiece at a reference processing speed along a predetermined tool trajectory, and each predetermined time interval is determined based on the processing speed. An axis control data generation unit that generates axis control data including the moving speed of the control axis;
A speed section determination unit that determines which speed section of each speed section the processing speed is divided into a plurality of speed sections with the reference processing speed as a maximum,
A frequent speed section acquisition unit that acquires a speed section having the highest occupation time ratio of the processing time required for the corresponding processing speed in each speed section as a frequent speed section;
A processing speed acquisition unit for acquiring a speed within the range of the frequent speed section as a corrected reference processing speed;
A determination unit that determines whether an occupation time ratio of the frequent speed section exceeds a predetermined reference occupation time ratio;
A machining data generation program that functions as an axis control data output unit that outputs the axis control data,
When one occupation time ratio of the frequent speed section does not exceed the reference occupation time ratio, the machining speed is obtained again using the corrected reference machining speed as the reference machining speed, and the frequent speed section is obtained. A machining data generation program that generates and outputs the axis control data with the corrected reference machining speed as the reference machining speed when the occupation time ratio of a section exceeds the reference occupation time ratio.