JP6719683B2 - Cutting machine and cutting method - Google Patents

Description

The present disclosure relates to a cutting machine such as a laser processing machine that irradiates a laser beam to process an object to be processed, and a cutting method.

As a cutting machine, a laser processing machine that irradiates a laser beam to process an object to be processed to produce a product having a predetermined shape is widely used. The laser processing machine cuts an object to be processed by tool diameter correction in consideration of a cutting amount by a laser beam so that a product has a predetermined shape. Patent Document 1 describes an example of a laser processing machine that cuts an object to be processed by tool diameter correction.

Japanese Patent No. 6087483

In the laser processing machine, when the relative position between the nozzle that emits the laser beam and the processing table on which the processing target is placed is fixed, the laser beam usually has a circular shape, so the cutting trace also has a circular shape. .. Even in a machining center provided with a plurality of types of rotary tools, the cutting trace normally has a circular shape when the position coordinates of the rotary tools are fixed. Also in the water jet processing machine, the cutting trace normally has a circular shape when the position coordinates at which the high-pressure water is ejected are fixed. Therefore, the tool diameter correction is based on the premise that the cutting trace is circular when the position coordinates of the cutting tool such as the nozzle, the rotary tool, and the high-pressure water are fixed.

Therefore, a cutting machine such as a laser processing machine sets the radius of the cutting trace by the cutting tool or the half width of the cutting trace as the tool diameter correction amount, and shifts by the tool diameter correction amount to move the workpiece. Controls the trajectory when cutting. Generally, in the conventional cutting machine, the tool radius correction does not correspond to the case where the cutting trace has a non-circular shape.

One or more embodiments include a cutting machine that can accurately correct the tool diameter of the cutting tool even if the cutting trace in a state where the position coordinate of the cutting tool is fixed is a non-circular shape. An object is to provide a cutting method.

According to a first aspect of one or more embodiments, a processing machine body for cutting a processing object, and an NC device for controlling the processing machine body are provided, wherein the NC device is the processing object. Based on the machining program and machining conditions set based on the product shape information including the dimensions and shape of the final machined product obtained by cutting, the tool diameter of the cutting tool for machining the object to be machined A tool radius correction amount calculation unit that generates tool radius correction information for correction, and a tool radius correction control signal that includes cutting machining correction conditions is generated based on the machining program, the machining conditions, and the tool radius correction information. And a drive control unit for generating a drive control signal for controlling the processing machine main body based on the tool radius correction control signal, wherein the processing machine main body is A machining unit for cutting the machining target by changing the relative position, and a tool trajectory control for controlling a tool trajectory corresponding to the cutting tool and having a non-circular shape based on the drive control signal. Section, and the machining condition includes cutting tool information for switching the tool locus during cutting , the tool radius correction amount calculation unit includes a plurality of tool loci included in the machining condition. Is recognized, and tool radius correction information including the plurality of tool loci is generated , the tool radius correction amount calculation unit sets a tool locus interpolation period at a switching time point of the tool loci, and the tool loci A tool locus in an interpolation period is set, and the processing machine main body switches the tool locus stepwise through the tool locus set in the tool locus interpolation period based on the drive control signal, and There is provided a cutting machine that corrects the tool diameter at the timing .

According to the second aspect of the one or more embodiments, it is set based on the product shape information including the size and shape of the final processed product obtained by cutting the processing target, and cutting the processing target. A tool diameter of the tool locus based on a machining condition and a machining program that corresponds to a cutting tool for machining and includes cutting tool information for changing a tool locus having a non-circular shape during cutting. Tool diameter compensation information for compensating the tool diameter, and based on the machining program, the machining condition and the tool diameter compensation information, a tool diameter compensation control signal including a machining compensation condition is generated, and the tool diameter compensation information is generated. When a drive control signal is generated based on a control signal, the tool trajectory is controlled based on the drive control signal, and the machining condition includes cutting tool information for switching the tool trajectory during cutting . Recognizing a plurality of tool trajectories included in the machining conditions, generating tool radius correction information including the plurality of tool trajectories , setting a tool trajectory interpolation period at the time of switching the tool trajectory, and A tool locus in a tool locus interpolation period is set, and the tool locus is stepwise switched based on the drive control signal via the tool locus set in the tool locus interpolation period, and at the switching timing. A cutting method for correcting a tool diameter is provided.

According to the cutting machine and the cutting method of one or more embodiments, even if the cutting trace in the state in which the position coordinates of the cutting tool are fixed is a non-circular shape, the tool diameter of the cutting tool is accurate. It can be corrected well.

FIG. 1 is a diagram showing an example of the overall configuration of a cutting machine according to one or more embodiments. FIG. 2 is a diagram showing the relationship between the nozzle and the tool locus. FIG. 3 is a diagram illustrating a configuration example of the tool trajectory control unit. FIG. 4 is a diagram showing a state in which the tool locus is changed under the condition without switching interpolation during cutting. FIG. 5 is a diagram showing a state in which the tool locus is changed under the condition that switching interpolation is performed during cutting. FIG. 6 is a flowchart showing an example of a cutting method according to one or more embodiments.

Hereinafter, a cutting machine and a cutting method according to one or more embodiments will be described with reference to the accompanying drawings. As an example of a cutting machine and a cutting method, a laser machine and a laser processing method will be described.

As shown in FIG. 1, the cutting machine 1 includes a laser oscillator 10, a machine body 100, and an NC device (numerical control device) 200. The NC device 200 controls the laser oscillator 10 and the processing machine body 100. The laser oscillator 10 generates and emits a laser beam. The laser beam emitted from the laser oscillator 10 is transmitted to the processing machine main body 100 via the process fiber 11. The processing machine body 100 irradiates a laser beam onto the object W to be processed, and changes the relative position between the object W to be processed and the beam spot of the laser beam, thereby cutting the object W to be processed.

As the laser oscillator 10, a laser oscillator that amplifies the excitation light emitted from the laser diode and emits a laser beam having a predetermined wavelength, or a laser oscillator that directly uses the laser beam emitted from the laser diode is suitable. The laser oscillator 10 is, for example, a solid-state laser oscillator, a fiber laser oscillator, a disk laser oscillator, or a direct diode laser oscillator (DDL oscillator).

The laser oscillator 10 emits a 1 μm band laser beam having a wavelength of 900 nm to 1100 nm. Taking a fiber laser oscillator and a DDL oscillator as examples, the fiber laser oscillator emits a laser beam having a wavelength of 1060 nm to 1080 nm, and the DDL oscillator emits a laser beam having a wavelength of 910 nm to 950 nm.

The processing machine main body 100 includes a processing table 101 on which the processing target W is placed, a gate-shaped X-axis carriage 102, a Y-axis carriage 103, a processing unit 104, and a tool trajectory control unit 300. The workpiece W is a sheet metal made of stainless steel, for example. The object to be processed may be an iron-based sheet metal other than stainless steel, or may be a sheet metal such as aluminum, aluminum alloy, or copper steel. The laser beam emitted from the laser oscillator 10 is transmitted to the processing unit 104 of the processing machine body 100 via the process fiber 11. The tool trajectory control unit 300 is housed inside the machining unit 104.

The X-axis carriage 102 is configured to be movable on the processing table 101 in the X-axis direction. The Y-axis carriage 103 is configured to be movable on the X-axis carriage 102 in the Y-axis direction orthogonal to the X-axis. The X-axis carriage 102 and the Y-axis carriage 103 move the processing unit 104 along the surface of the workpiece W in the X-axis direction, the Y-axis direction, or any combination direction of the X-axis and the Y-axis. Functions as a mechanism.

Instead of moving the processing unit 104 along the surface of the workpiece W, the processing machine main body 100 may be configured such that the position of the processing unit 104 is fixed and the workpiece W moves. .. The processing machine body 100 may include a moving mechanism that moves the processing unit 104 relative to the surface of the processing target W.

A nozzle 106 is attached to the processing unit 104. A circular opening 105 is formed at the tip of the nozzle 106. The laser beam transmitted to the processing unit 104 is emitted from the opening 105 of the nozzle 106 and is irradiated on the processing target W.

An assist gas such as nitrogen or air is supplied to the processing unit 104. The assist gas may be oxygen, and the mixing ratio of nitrogen and oxygen can be arbitrarily set depending on whether the purpose is to suppress oxidation or to utilize heat of oxidation reaction. The laser beam is applied to the workpiece W through the opening 105, and the assist gas is blown onto the workpiece W through the opening 105. The assist gas discharges the melted material within the kerf width in which the workpiece W is melted.

The tool trajectory control unit 300 functions as a beam vibrating mechanism that vibrates the laser beam that travels in the processing unit 104 and is emitted from the opening 105 in a non-circular vibration pattern. When the tool locus control unit 300 vibrates the laser beam in a non-circular vibration pattern, the machining unit 104 cuts the workpiece W with the non-circular tool locus. A specific configuration example of the tool trajectory control unit 300 and a method of causing the tool trajectory control unit 300 to vibrate the beam spot of the laser beam in a non-circular vibration pattern will be described later.
Here, the tool locus is a figure in which a locus of a beam made by a beam vibration that is vibrated in a non-circular vibration pattern within a certain time is drawn, and indicates a vibrating tool shape. That is, normally, the circular laser beam itself emitted from the nozzle 106 is the cutting tool, and the beam radius corresponds to the tool radius correction. However, here, the tool trajectory of the figure drawn by the vibration pattern is referred to as the cutting tool. To do. The cutting trace in the state where the relative position between the nozzle 106 and the machining table 101 is fixed corresponds to the tool locus.

A CAD (Computer Aided Design) device 20 generates product shape data (CAD data) SD based on product shape information including the size and shape of the final processed product obtained by cutting the processing target W, and the CAM. (Computer Aided Manufacturing) Output to the device 21. The CAM device 21 generates a processing program (NC data) PP for the cutting machine 1 to cut the processing target W based on the product shape data SD, and specifies the processing conditions CP. That is, the processing program PP and the processing conditions CP are set based on the product shape information including the size and shape of the final processed product.

The machining program PP includes G41 (left tool diameter correction) for controlling the trajectory of the cutting tool by shifting the tool diameter correction amount to the left side in the cutting direction, or the tool diameter on the right side in the cutting direction. The G code indicated by G42 (right tool diameter correction) for controlling the trajectory of the cutting tool by shifting by the correction amount is included.

The CAM device 21 specifies a tool locus corresponding to a cutting tool as the processing condition CP. The tool path has, for example, a non-circular shape. The CAM device 21 can specify a plurality of tool loci having different shapes or tool diameters. The processing condition CP includes cutting tool information for changing the tool locus during cutting.

The processing condition CP includes processing target information in which material parameters such as the material and the thickness of the processing target W are designated. The processing conditions CP include laser beam output, processing speed, processing parameters such as the diameter (nozzle diameter) of the opening 105 of the nozzle 106, and cutting processing information such as assist gas conditions. That is, the processing condition CP includes cutting tool information such as a tool locus, processing target information, and cutting processing information.

The CAM device 21 outputs the machining program PP and the machining condition CP to the NC device 200 of the cutting machine 1. The NC device 200 controls the laser oscillator 10 based on the machining program PP and the machining conditions CP. The NC device 200 moves the nozzle 106 to a target position by controlling the processing machine body 100 to drive the X-axis carriage 102 and the Y-axis carriage 103 based on the processing program PP and the processing conditions CP.

The NC device 200 controls the trajectory of the beam spot of the laser beam emitted from the opening 105 of the nozzle 106 by controlling the tool trajectory controller 300 based on the machining program PP and the machining condition CP. The trajectory of the beam spot corresponds to the tool trajectory.

The NC device 200 includes a tool radius correction amount calculation unit 201, a machining trajectory calculation unit 202, and a drive control unit 203. The machining program PP and the machining condition CP are input from the CAM device 21 to the tool radius correction amount calculation unit 201 and the machining trajectory calculation unit 202. The tool radius correction amount calculation unit 201 generates tool radius correction information TC for correcting the tool radius of the cutting tool for cutting the workpiece W based on the machining program PP and the machining conditions CP.

The tool radius correction information TC will be described with reference to FIG. FIG. 2 shows the locus (tool locus) of the beam spot of the laser beam emitted from the inside of the nozzle 106 through the opening 105 to the workpiece W.

The tool radius correction amount calculation unit 201 recognizes the tool locus TP included in the processing condition CP. The tool radius correction amount calculation unit 201 generates the tool radius correction information TC based on the recognized tool trajectory TP, the trajectory NP of the nozzle 106 (hereinafter referred to as the nozzle trajectory NP), and the advancing direction DT of cutting. .. The tool locus TP corresponds to a cutting tool for cutting the workpiece W. The shape of the tool trajectory TP corresponds to the shape of the cutting tool. The tool trajectory TP has, for example, a non-circular shape.

The tool radius correction information TC includes a control center point CL on the tool trajectory TP, machining surface forming positions MPL and MPR, tool radius correction values MVLL and MVLR, and offset values SVLL and SVLR. Further, the tool radius correction information TC includes a center point CN of the nozzle 106 on the nozzle locus NP (hereinafter referred to as a nozzle center point CN), tool radius correction values MVNL and MVNR, and offset values SVNL and SVNR. The control center point CL corresponds to the center of the laser beam in the case of tool diameter correction in general laser processing. In one or more embodiments, since the tool path is a non-circular cutting tool, the cutting tool is controlled with respect to the cutting line (cutting position) when the cutting line is the boundary between the cutting tool and the product. The center position. The nozzle locus NP is specifically the locus of the nozzle center point CN. The center point CN of the nozzle 106 and the center point of the opening 105 coincide with each other.

CCNa and CCNb shown in FIG. 2 indicate the center lines of the nozzle 106. The center line CCNa is parallel to the traveling direction DT, and the center line CCNb is perpendicular to the traveling direction DT. BS shown in FIG. 2 indicates the beam spot of the laser beam moving on the tool trajectory TP. As an example of the non-circular shape, FIG. 2 shows a tool locus TP of a vibration pattern that vibrates the beam spot BS so that the beam spot BS draws an alphabet C. The vibration pattern of the tool path TP may be any free shape including a non-circular shape.

In the case of a laser processing machine, the tool locus TP corresponds to the locus of the beam spot BS of the laser beam. The beam spot BS reciprocates on the tool trajectory TP. Alternatively, the beam spot BS may periodically move as long as it has a non-circular shape. The machining surface formation positions MPL and MPR correspond to positions where the distance from the center line CCLa that passes through the control center point CL and is parallel to the traveling direction DT to the beam spot BS on the tool trajectory TP is the maximum. The machining surface forming positions MPL and MPR are positions at which the machining surface is formed on the workpiece W when the tool path TP moves in the advancing direction DT of cutting. That is, the machined surface forming positions MPL and MPR are positions where the tool diameter is maximum on the tool trajectory TP.

The machined surface forming positions MPL and MPR correspond to positions where the distance from the center line CCNa passing through the nozzle center point CN and parallel to the traveling direction DT in the nozzle locus NP is maximum. That is, the machined surface forming positions MPL and MPR are positions where the tool diameter is maximum on the nozzle locus NP. The machining surface forming position MPL is a parameter for left tool diameter correction, and the machining surface forming position MPR is a parameter for right tool diameter correction.

The tool diameter correction values MVLL and MVLR on the tool locus TP correspond to the distances from the center line CCLa to the machining surface forming positions MPL and MPR. The tool diameter correction values MVLL and MVLR on the tool trajectory TP correspond to the tool diameter on the tool trajectory TP. The tool diameter correction values MVNL and MVNR on the nozzle locus NP correspond to the distances from the center line CCNa to the machining surface forming positions MPL and MPR. The tool diameter correction values MVNL and MVNR on the nozzle locus NP correspond to the tool diameter on the nozzle locus NP. The tool radius correction values MVLL and MVNL are parameters for left tool radius correction, and the tool radius correction values MVLR and MVNR are parameters for right tool radius correction.

The offset values SVLL and SVLR on the tool trajectory TP correspond to the distances from the center line CCLb that passes through the control center point CL and is perpendicular to the traveling direction DT to the machining surface formation positions MPL and MPR. The offset values SVNL and SVNR on the nozzle locus NP correspond to the distances from the center line CCNb that passes through the nozzle center point CN and is perpendicular to the traveling direction DT to the machined surface forming positions MPL and MPR. The offset values SVLL and SVNL are parameters for left tool radius correction, and the offset values SVLR and SVNR are parameters for right tool radius correction.

Therefore, the tool radius correction amount calculation unit 201 recognizes the tool trajectory TP included in the machining condition CP, and based on the machining program PP and the machining condition CP, correction information based on the tool trajectory TP and correction based on the nozzle trajectory NP. Tool diameter correction information TC including the information is generated. The tool radius correction amount calculation unit 201 outputs the tool radius correction information TC to the machining trajectory calculation unit 202. Further, the tool radius correction amount calculation unit 201 outputs the tool radius correction information TC including the correction information of both the left tool radius correction and the right tool radius correction to the machining trajectory calculation unit 202.

The machining program PP and the machining condition CP are input from the CAM device 21 to the machining trajectory calculation unit 202, and the tool radius correction information TC is input from the tool radius correction amount calculation unit 201. The processing locus calculation unit 202 translates the G code included in the processing program PP. The machining program PP may include a robot language or the like instead of the G code.

Based on the translation result, the machining program PP, the machining condition CP, and the tool radius correction information TC, the machining locus calculation unit 202 uses the nozzle locus NP to perform cutting with the left tool radius correction, or uses the nozzle locus NP. Cutting with the right tool radius correction using the tool trajectory TP, the left tool diameter correction using the tool trajectory TP, or the right tool diameter correction using the tool trajectory TP. Determine the processing correction conditions.

The machining locus calculation unit 202 generates the tool radius correction control signal TS based on the translation result, the machining program PP, the machining condition CP, the tool radius correction information TC, and the determined cutting radius correction condition. The machining trajectory calculation unit 202 outputs the tool radius correction control signal TS to the drive control unit 203. The drive control unit 203 generates a drive control signal CS that controls the processing machine body 100 based on the tool radius correction control signal TS. The drive control unit 203 outputs a drive control signal CS to the processing machine body 100.

When performing cutting with the left tool radius correction using the tool trajectory TP, the drive control unit 203 drives based on the tool trajectory TP, the control center point CL on the tool trajectory TP, the tool radius correction value MVLL, and the offset value SVLL. The control signal CS is generated. When performing cutting with the right tool radius correction using the tool trajectory TP, the drive control unit 203 drives based on the tool trajectory TP, the control center point CL on the tool trajectory TP, the tool radius correction value MVLR, and the offset value SVLR. The control signal CS is generated.

When performing cutting with the left tool radius correction using the nozzle trajectory NP, the drive control unit 203 drives based on the nozzle trajectory NP, the nozzle center point CN in the nozzle trajectory NP, the tool radius correction value MVNL, and the offset value SVNL. The control signal CS is generated. When performing cutting with the right tool diameter correction using the nozzle trajectory NP, the drive control unit 203 drives based on the nozzle trajectory NP, the nozzle center point CN in the nozzle trajectory NP, the tool radius correction value MVNR, and the offset value SVNR. The control signal CS is generated.

The drive control unit 203 controls the tool locus control unit 300 of the processing machine body 100 by the drive control signal CS. The tool trajectory control unit 300 controls the trajectory of the beam spot BS of the laser beam emitted from the opening 105 of the nozzle 106 based on the drive control signal CS.

A specific configuration example of the tool trajectory control unit 300 and an example of a method by which the tool trajectory control unit 300 vibrates the beam spot BS of the laser beam in a non-circular vibration pattern will be described with reference to FIG. 3.

As shown in FIG. 3, the tool trajectory control unit 300 is housed inside the machining unit 104. The tool trajectory control unit 300 includes a collimator lens 331, a galvano scanner unit 340, a bend mirror 334, and a focusing lens 335. The collimator lens 331 converts the laser beam emitted from the process fiber 11 into parallel light (collimated light).

The galvano scanner unit 340 includes a scan mirror 341 (first scan mirror), a drive unit 342 (first drive unit) that rotationally drives the scan mirror 341, a scan mirror 343 (second scan mirror), and a scan. And a drive unit 344 (second drive unit) that rotationally drives the mirror 343.

The drive unit 342 can reciprocate the scan mirror 341 in a predetermined direction (for example, the X direction) within a predetermined angle range under the control of the drive control unit 203. The scan mirror 341 reflects the laser beam converted into parallel light by the collimator lens 321 toward the scan mirror 343.

The drive unit 344 can reciprocally drive the scan mirror 343 in a predetermined angle range in a direction different from the drive direction of the scan mirror 341 (Y direction, for example) under the control of the drive control unit 203. The scan mirror 343 reflects the laser beam reflected by the scan mirror 341 toward the bend mirror 334.

The bend mirror 334 reflects the laser beam reflected by the scan mirror 343 downward in the Z-axis direction perpendicular to the X-axis and the Y-axis. The focusing lens 335 focuses the laser beam reflected by the bend mirror 334 and irradiates the object W to be processed.

The galvano scanner unit 340 can reciprocally oscillate one or both of the scan mirror 341 and the scan mirror 343 at a high speed, for example, at 1000 Hz or more, thereby making cutting traces into various non-circular shapes. That is, by converging a laser beam having a certain light intensity or more to a plurality of locations per unit time, it is possible to make the tool shape which is in contact with the object W to be processed and which substantially contributes to the processing into various non-circular shapes. Can be arbitrary.

A case where the machining condition CP includes cutting tool information for changing the tool locus TP during cutting will be described with reference to FIGS. 4 and 5. FIG. 4 and FIG. 5 show a case where the cutting is performed by the left tool radius correction using the tool trajectory TP. The machining condition CP includes a plurality of tool trajectories TP corresponding to a plurality of cutting tools, tool trajectory switching information including a timing (switching point or position) at which the tool trajectory TP is switched, and a switching method. The plurality of tool paths TP have different shapes or tool diameters. The tool path switching information includes, for example, a parameter with or without switching interpolation as a switching method.

The tool radius correction amount calculation unit 201 recognizes whether or not the tool condition switching information is included in the processing condition CP. When the machining condition CP does not include the tool trajectory switching information, the tool radius correction amount calculation unit 201 recognizes the tool trajectory TP included in the machining condition CP. When the machining condition CP includes the tool trajectory switching information, the tool radius correction amount calculation unit 201 recognizes the plurality of tool trajectories TP included in the tool trajectory switching information.

The tool radius correction amount calculation unit 201 generates the tool radius correction information TC having the above-mentioned tool trajectory switching information including a plurality of tool trajectories TP based on the machining conditions CP. Further, the tool radius correction amount calculation unit 201, based on the machining program PP and the machining condition CP, the machining surface forming positions MPL and MPR that are the switching reference positions of the plurality of tool trajectories TP, and the control center of each tool trajectory TP. The tool radius correction information TC having the tool trajectory change information including the point CL, the tool radius correction values MVLL and MVLR, and the offset values SVLL and SVLR is generated. That is, the tool radius correction information TC includes the above-described tool locus switching information and tool locus change information.

FIG. 4 shows a case where the machining condition CP includes cutting tool information that switches the tool trajectory TP11 to the tool trajectory TP12 at the switching time t1 and switches the tool trajectory TP12 to the tool trajectory TP11 at the switching time t2. FIG. 4 shows a case where the tool radius correction information TC includes a parameter without switching interpolation. Note that FIG. 4 shows a case where the offset values SVLL and SVLR are 0 for the sake of easy understanding of the description.

The tool radius correction amount calculation unit 201, the tool locus TP11 selected during the period up to the switching time t1, the control center point CL11 on the tool locus TP11, the machining surface forming positions MPL11 and MPR11, and the tool radius correction values MVLL11 and MVLR11. And tool diameter correction information TC including the offset values SVLL11 and SVLR11. The machining surface forming positions MPL11 and MPR11 are reference positions for switching the tool path TP11. The offset values SVLL11 and SVLR11 correspond to the offset values SVLL and SVLR shown in FIG.

The tool radius correction amount calculation unit 201, the tool trajectory TP12 selected in the period from the switching time t1 to the switching time t2, the control center point CL12 in the tool trajectory TP12, the machining surface forming positions MPL12 and MPR12, and the tool diameter correction Tool diameter correction information TC including values MVLL12 and MVLR12 and offset values SVLL12 and SVLR12 is generated. The machining surface forming positions MPL12 and MPR12 are reference positions for switching the cutting tool CT2. The offset values SVLL12 and SVLR12 correspond to the offset values SVLL and SVLR shown in FIG.

The tool radius correction amount calculation unit 201 selects the tool locus TP11 in the period after the switching time t2, the control center point CL11 on the tool locus TP11, the machining surface forming positions MPL11 and MPR11, and the tool radius correction values MVLL11 and MVLR11. And tool diameter correction information TC including the offset values SVLL11 and SVLR11. The tool radius correction amount calculation unit 201 outputs the tool radius correction information TC to the machining trajectory calculation unit 202.

The processing locus calculation unit 202 translates the G code included in the processing program PP. Based on the translation result, the machining program PP, the machining condition CP, and the tool radius correction information TC, the machining locus calculation unit 202 uses the nozzle locus NP to perform cutting with the left tool radius correction, or uses the nozzle locus NP. Cutting with the right tool radius correction using the tool trajectory TP, the left tool diameter correction using the tool trajectory TP, or the right tool diameter correction using the tool trajectory TP. Determine the processing correction conditions.

When it is determined to perform cutting with the left tool radius correction using the tool trajectory TP, the machining trajectory calculation unit 202, based on the tool radius correction information TC, at the switching time t1, the machining surface forming position MPL11 and the machining surface. The tool radius correction control signal TS including the first switching information for matching the forming position MPL12 and switching the tool locus TP11 to the tool locus TP12 is generated.

Further, the machining locus calculation unit 202 is the second switching information for switching the control center point CL11, the tool radius correction value MVLL11, and the offset value SVLL11 to the control center point CL12, the tool radius correction value MVLL12, and the offset value SVLL12. A tool diameter correction control signal TS including is generated.

Based on the tool radius correction information TC, the machining trajectory calculation unit 202 matches the machining surface forming position MPL12 and the machining surface forming position MPL11 at the switching time t2, and switches the tool trajectory TP12 to the tool trajectory TP11. The tool diameter correction control signal TS including the switching information of 3 is generated.

The machining locus calculation unit 202 also changes the control center point CL12, the tool radius correction value MVLL12, and the offset value SVLL12 to the control center point CL11, the tool radius correction value MVLL11, and the offset value SVLL11. A tool diameter correction control signal TS including is generated. That is, the tool radius correction amount calculation unit 201 generates the tool radius correction control signal TS including the first to fourth switching information when it is determined to perform cutting by the left tool radius correction using the tool trajectory TP. ..

The machining trajectory calculation unit 202 outputs the tool radius correction control signal TS to the drive control unit 203. The drive control unit 203 generates a drive control signal CS based on the tool radius correction control signal TS. The drive control unit 203 controls the processing machine body 100 by the drive control signal CS. The processing machine main body 100 drives the X-axis carriage 102 and the Y-axis carriage 103 based on the drive control signal CS to control the nozzle locus NP. Further, the processing machine body 100 drives the tool locus control unit 300 to control the tool locus TP based on the drive control signal CS.

When the tool diameter correction information TC includes a parameter without switching interpolation, the processing machine body 100 matches the processing surface forming position MPL11 and the processing surface forming position MPL12 at the switching time point t1 and sets the tool trajectory TP11 to the tool trajectory TP12. Switch instantly. Further, the processing machine body 100 changes the control center point CL11, the tool diameter correction value MVLL11, and the offset value SVLL11 to the control center point CL12, the tool diameter correction value MVLL12, and the offset value SVLL12 at the switching timing. To execute.

When the tool diameter correction information TC includes a parameter without switching interpolation, the processing machine body 100 matches the processing surface forming position MPL12 and the processing surface forming position MPL11 at the switching time t2, and sets the tool trajectory TP12 to the tool trajectory TP11. Switch instantly. Further, the processing machine main body 100 changes the control center point CL12, the tool radius correction value MVLL12, and the offset value SVLL12 at the switching timing to the control center point CL11, the tool radius correction value MVLL11, and the offset value SVLL11. To execute.

FIG. 5 shows a case where the machining condition CP includes cutting tool information that switches the tool trajectory TP11 to the tool trajectory TP12 at the switching time t1 and switches the tool trajectory TP12 to the tool trajectory TP11 at the switching time t2. FIG. 5 shows a case where the tool radius correction information TC includes a parameter with switching interpolation. Note that FIG. 5 shows a case where the offset values SVLL and SVLR are 0 for the sake of easy understanding of the description.

When the tool radius correction information TC includes a parameter with switching interpolation, the tool radius correction amount calculation unit 201 sets the tool locus interpolation period SP11 for the switching time t1. The tool locus interpolation period SP11 is a predetermined period until the switching time t1.

The tool radius correction amount calculation unit 201 extracts feature points of the tool locus TP11 and the tool locus TP12. The tool radius correction amount calculation unit 201 sets a characteristic curve based on the extracted characteristic points. The tool radius correction amount calculation unit 201 sets the tool locus TP112 in the tool locus interpolation period SP11 while keeping the ratio between the constituent points of the characteristic curve constant. The tool locus TP112 is an interpolation tool locus that interpolates the tool locus TP11 and the tool locus TP12 in order to switch the tool locus TP11 and the tool locus TP12 stepwise.

The tool radius correction amount calculation unit 201, the tool locus TP11 selected during the period up to the switching time t1, the control center point CL11 on the tool locus TP11, the machining surface forming positions MPL11 and MPR11, and the tool radius correction values MVLL11 and MVLR11. And tool diameter correction information TC including the offset values SVLL11 and SVLR11.

The tool radius correction amount calculation unit 201 sets the tool trajectory TP112 set in the tool trajectory interpolation period SP11, the control center point CL112 in the tool trajectory TP112, the machining surface forming positions MPL112 and MPR112, and the tool radius correction values MVLL112 and MVLR112. , Tool diameter correction information TC including the offset values SVLL112 and SVLR112 is generated. The offset values SVLL112 and SVLR112 correspond to the offset values SVLL and SVLR shown in FIG.

The tool radius correction amount calculation unit 201 sets the tool trajectory interpolation period SP12 for the switching time point t2. The tool locus interpolation period SP12 is a predetermined period until the switching time t2. The tool radius correction amount calculation unit 201 extracts feature points of the tool locus TP12 and the tool locus TP11. The tool radius correction amount calculation unit 201 sets a characteristic curve based on the extracted characteristic points. The tool radius correction amount calculation unit 201 sets the tool locus TP121 in the tool locus interpolation period SP12 while keeping the ratio between the constituent points of the characteristic curve constant. The tool trajectory TP121 is an interpolation tool trajectory that interpolates the tool trajectory TP12 and the tool trajectory TP11 in order to switch the tool trajectory TP21 and the tool trajectory TP11 in a stepwise manner.

The tool radius correction amount calculation unit 201, the tool trajectory TP12 selected in the period from the switching time t1 to the switching time t2, the control center point CL12 in the tool trajectory TP12, the machining surface forming positions MPL12 and MPR12, and the tool diameter correction Tool diameter correction information TC including values MVLL12 and MVLR12 and offset values SVLL12 and SVLR12 is generated.

The tool radius correction amount calculation unit 201 sets the tool trajectory TP121 set in the tool trajectory interpolation period SP12, the control center point CL121 in the tool trajectory TP121, the machining surface forming positions MPL121 and MPR121, and the tool radius correction values MVLL121 and MVLR121. , Tool diameter correction information TC including the offset values SVLL121 and SVLR121 is generated. The offset values SVLL121 and SVLR121 correspond to the offset values SVLL and SVLR shown in FIG.

The tool radius correction amount calculation unit 201 selects the tool locus TP11 in the period after the switching time t2, the control center point CL11 on the tool locus TP11, the machining surface forming positions MPL11 and MPR11, and the tool radius correction values MVLL11 and MVLR11. And tool diameter correction information TC including the offset values SVLL11 and SVLR11. That is, the tool radius correction information TC includes the tool radius correction information on the tool loci TP11, TP112, TP12, and TP121.

The tool radius correction amount calculation unit 201 outputs the tool radius correction information TC to the machining trajectory calculation unit 202. The processing locus calculation unit 202 translates the G code included in the processing program PP. Based on the translation result, the machining program PP, the machining condition CP, and the tool radius correction information TC, the machining locus calculation unit 202 uses the nozzle locus NP to perform cutting with the left tool radius correction, or uses the nozzle locus NP. Cutting with the right tool radius correction using the tool trajectory TP, the left tool diameter correction using the tool trajectory TP, or the right tool diameter correction using the tool trajectory TP. Determine the processing correction conditions.

When it is determined to perform cutting with the left tool radius correction using the tool trajectory TP, the machining trajectory calculation unit 202 sets the tool trajectory TP11 in the tool trajectory interpolation period SP11 based on the tool radius correction information TC. A tool diameter correction control signal TS including fifth switching information for switching to TP112 is generated. Further, the tool radius correction amount calculation unit 201 sets the control center point CL11 of the tool locus TP11, the tool radius correction value MVLL11 and the offset value SVLL11 to the control center point CL112 of the tool locus TP112, the tool radius correction value MVLL112 and the offset value SVLL112. A tool radius correction control signal TS including sixth switching information for switching to and is generated.

Based on the tool radius correction information TC, the machining trajectory calculation unit 202 generates a tool radius correction control signal TS including seventh switching information for switching the tool trajectory TP112 to the tool trajectory TP12 at the switching time point t1. Further, the tool radius correction amount calculation unit 201 calculates the control center point CL112 of the tool trajectory TP112, the tool radius correction value MVLL112, and the offset value SVLL112, and the control center point CL12 of the tool trajectory TP12, the tool radius correction value MVLL12, and the offset value SVLL12. A tool diameter correction control signal TS including eighth switching information for switching to and is generated.

The machining locus calculation unit 202 generates a tool radius correction control signal TS including ninth switching information for switching the tool locus TP12 to the tool locus TP121 in the tool locus interpolation period SP12 based on the tool radius correction information TC. To do. Further, the tool radius correction amount calculation unit 201 calculates the control center point CL12 of the tool trajectory TP12, the tool radius correction value MVLL12, and the offset value SVLL12, and the control center point CL121 of the tool trajectory TP121, the tool radius correction value MVLL121, and the offset value SVLL121. A tool radius correction control signal TS including tenth switching information for switching to and is generated.

Based on the tool radius correction information TC, the machining trajectory calculation unit 202 generates a tool radius correction control signal TS including eleventh switching information for switching the tool trajectory TP121 to the tool trajectory TP11 at the switching time t2. Further, the tool radius correction amount calculation unit 201 calculates the control center point CL121 of the tool trajectory TP121, the tool radius correction value MVLL121, and the offset value SVLL121, and the control center point CL11 of the tool trajectory TP11, the tool radius correction value MVLL11, and the offset value SVLL11. A tool radius correction control signal TS including twelfth switching information for switching to and is generated. That is, the tool radius correction amount calculation unit 201 generates the tool radius correction control signal TS including the fifth to twelfth switching information.

The machining trajectory calculation unit 202 outputs the tool radius correction control signal TS to the drive control unit 203. The drive control unit 203 generates a drive control signal CS based on the tool radius correction control signal TS. The drive control unit 203 controls the processing machine body 100 by the drive control signal CS. The processing machine main body 100 drives the X-axis carriage 102 and the Y-axis carriage 103 based on the drive control signal CS to control the nozzle locus NP. Further, the processing machine body 100 drives the tool locus control unit 300 to control the tool locus TP based on the drive control signal CS.

When the tool radius correction information TC includes a parameter with switching interpolation, the processing machine body 100 switches the tool locus TP11 to the tool locus TP12 step by step via the tool locus TP112 set in the tool locus interpolation period SP11. ..

Further, the processing machine main body 100 changes the control center point CL11, the tool diameter correction value MVLL11, and the offset value SVLL11 at the switching timing to the control center point CL112, the tool diameter correction value MVLL112, and the offset value SVLL112. To execute.

Further, the processing machine main body 100 changes the control center point CL112, the tool diameter correction value MVLL112, and the offset value SVLL112 to the control center point CL12, the tool diameter correction value MVLL12, and the offset value SVLL12 at the switching timing. To execute.

When the tool radius correction information TC includes a parameter with switching interpolation, the processing machine body 100 switches the tool locus TP12 to the tool locus TP11 step by step via the tool locus TP121 set in the tool locus interpolation period SP12. .. Further, the processing machine main body 100 changes the control center point CL12, the tool diameter correction value MVLL12, and the offset value SVLL12 to the control center point CL121, the tool diameter correction value MVLL121, and the offset value SVLL121 at the switching timing. To execute.

Further, the processing machine main body 100 changes the control center point CL121, the tool diameter correction value MVLL121, and the offset value SVLL121 to the control center point CL11, the tool diameter correction value MVLL11, and the offset value SVLL11 at the switching timing. To execute.

An example of the cutting method will be described with reference to the flowchart shown in FIG. In step S1, the CAD device 20 generates the product shape data SD based on the product shape information including the size and shape of the final processed product. Further, the CAD device 20 outputs the product shape data SD to the CAM device 21.

In step S2, the CAM device 21 generates a machining program PP (including a G code) for the cutting machine 1 based on the product shape data SD and specifies the machining condition CP. Further, the CAM device 21 outputs the machining program PP and the machining condition CP to the NC device 200 of the cutting machine 1.

In step S3, the NC device 200 controls the processing machine main body 100 based on the processing program PP and the processing condition CP to drive the X-axis carriage 102 and the Y-axis carriage 103, so that the nozzle 106 is targeted. Move to position. Further, in step S4, the NC device 200 controls the laser oscillator 10 based on the machining program PP and the machining condition CP to emit a laser beam from the opening 105 of the nozzle 106 to the workpiece W. Irradiate. The timing of step S3 and step S4 is controlled based on the machining program PP and machining conditions CP.

The machining program PP and the machining conditions CP are input from the CAM device 21 to the tool radius correction amount calculation unit 201 and the machining trajectory calculation unit 202 of the NC device 200 in step S2. In step S5, the tool radius correction amount calculation unit 201 recognizes whether or not the tool condition switching information is included in the machining conditions CP. When it is recognized that the machining condition CP does not include the tool trajectory switching information, the tool radius correction amount calculation unit 201 recognizes the tool trajectory TP included in the machining condition CP.

When it is recognized that the machining condition CP includes the tool trajectory switching information, the tool radius correction amount calculation unit 201 recognizes the plurality of tool trajectories TP included in the tool trajectory switching information. In step S6, the tool radius correction amount calculation unit 201 sets the tool locus interpolation period SP for the switching time t of the tool locus TP.

In step S7, the tool radius correction amount calculation unit 201 extracts the characteristic points of the plurality of tool trajectories TP recognized in step S5. The tool radius correction amount calculation unit 201 sets a characteristic curve based on the extracted characteristic points. Further, the tool radius correction amount calculation unit 201 sets the ratio between the constituent points of the characteristic curve to be constant and sets the tool trajectory TP (interpolated tool trajectory) in the tool trajectory interpolation period SP.

In step S8, the tool radius correction amount calculation unit 201 generates the tool radius correction information TC including the correction information based on the tool trajectory TP and the correction information based on the nozzle trajectory NP based on the machining program PP and the machining conditions CP. To generate. Further, the tool radius correction amount calculation unit 201 outputs the tool radius correction information TC to the machining trajectory calculation unit 202.

The machining program PP and the machining condition CP are input from the CAM device 21 to the machining trajectory calculation unit 202, and the tool radius correction information TC is input from the tool radius correction amount calculation unit 201. The processing locus calculation unit 202 translates the G code included in the processing program PP in step S9. Further, the machining locus calculation unit 202 performs cutting with left tool radius correction using the nozzle locus NP based on the translation result, the machining program PP, the machining condition CP, and the tool radius correction information TC, or the nozzle locus NP. To perform cutting with the right tool radius correction using the tool, using the tool trajectory TP to perform the left tool diameter correction, or using the tool trajectory TP to perform the right tool diameter correction. Determine the cutting correction conditions for.

In step S10, the machining trajectory calculation unit 202 generates the tool radius correction control signal TS based on the machining program PP, the machining conditions CP, the tool radius correction information TC, and the determined cutting machining correction conditions. Further, the machining trajectory calculation unit 202 outputs a tool radius correction control signal TS to the drive control unit 203. In step S11, the drive control unit 203 generates a drive control signal CS that controls the processing machine body 100 based on the tool radius correction control signal TS. The drive control unit 203 outputs a drive control signal CS to the processing machine body 100.

In step S12, the processing machine main body 100 drives the X-axis carriage 102 and the Y-axis carriage 103 based on the drive control signal CS to control the nozzle locus NP. Further, the processing machine body 100 drives the tool locus control unit 300 to control the tool locus TP based on the drive control signal CS.

Further, the processing machine main body 100 switches the tool path TP based on the drive control signal CS, and corrects the tool diameter at the switching timing. When the tool radius correction information TC includes a parameter without switching interpolation, the drive control unit 203 instantaneously switches and changes the tool locus TP. When the tool radius correction information TC includes a parameter with switching interpolation, the drive control unit 203 changes the tool locus TP in stages through the tool locus TP set in the tool locus interpolation period SP to change.

In the cutting machine and the cutting method according to one or more embodiments, the tool radius correction information TC including the correction information based on the tool trajectory TP and the correction information based on the nozzle trajectory NP is generated. In the cutting machine and the cutting method according to one or more embodiments, the nozzle locus NP and the tool are controlled by controlling the driving of the machining unit 104 and the tool locus control unit 300 based on the tool diameter correction information TC. Control the locus TP. Therefore, according to the cutting machine and the cutting method of one or more embodiments, the cutting work in the state where the tool locus corresponding to the cutting tool or the relative position between the nozzle 106 and the working table 101 is fixed. Even if the mark has a non-circular shape, the tool diameter of the cutting tool can be accurately corrected.

In the cutting machine and the cutting method according to one or more embodiments, when the processing condition CP includes cutting tool information for changing the tool locus during cutting, the cutting machine 1 is Tool diameter correction information TC including the tool trajectory TP is generated. Furthermore, in the cutting machine and the cutting method according to one or more embodiments, the tool radius correction control signal TS including the switching information for switching the tool locus TP is generated based on the tool radius correction information TC. Furthermore, in the cutting machine and the cutting method according to one or more embodiments, the machine body 100 is controlled based on the tool diameter correction control signal TS to switch the tool locus TP.

Therefore, according to the cutting machine and the cutting method of one or more embodiments, the tool locus TP is switched based on the tool diameter correction information TC even when the cutting tool information is included in the processing condition CP. As a result, the tool diameter can be accurately corrected.

The present invention is not limited to the one or more embodiments described above, and various modifications can be made without departing from the gist of the present invention.

In the cutting machine and the cutting method of one or more embodiments, one interpolation tool locus is set in the tool locus interpolation periods SP11 and SP12, but a plurality of interpolation tool loci may be set.

In the cutting machine and the cutting method of one or more embodiments, the laser machine and the laser processing method have been described as examples, but the invention is not limited thereto. For example, the present invention can be applied to a water jet processing machine.

The disclosure of the present application is related to the subject matter described in Japanese Patent Application No. 2018-128923, filed on July 6, 2018, the entire disclosures of which are incorporated herein by reference.

Claims (4)

A processing machine body that cuts the processing object,
An NC device for controlling the main body of the processing machine,
Equipped with
The NC device is
A cutting tool for cutting the processing target object based on a processing program and processing conditions set based on product shape information including dimensions and shapes of final processed products obtained by cutting the processing target object. A tool radius correction amount calculation unit that generates tool radius correction information for correcting the tool radius of
A machining trajectory calculation unit that generates a tool radius correction control signal including a cutting machining correction condition based on the machining program, the machining condition, and the tool radius correction information;
A drive control unit that generates a drive control signal that controls the processing machine body based on the tool diameter correction control signal;
Have
The processing machine body is
By changing the relative position to the processing object, a processing unit for cutting the processing object,
A tool trajectory control unit that controls the tool trajectory corresponding to the cutting tool and having a non-circular shape based on the drive control signal;
Have
When the machining condition includes cutting tool information for switching the tool locus during cutting, the tool radius correction amount calculation unit recognizes a plurality of tool loci included in the machining condition, Generate tool radius correction information including the tool trajectory of
The tool radius correction amount calculation unit sets a tool locus interpolation period at the switching time point of the tool locus, and sets a tool locus in the tool locus interpolation period,
Based on the drive control signal, the processing machine main body switches the tool trajectory in stages via the tool trajectory set in the tool trajectory interpolation period, and corrects the tool radius at the timing of switching. Cutting machine. A laser oscillator that generates and emits a laser beam is further provided, and the NC device controls the laser oscillator and the processing machine body,
The processing unit has a nozzle attached to the tip of the processing unit and having an opening for emitting a laser beam emitted from the laser oscillator to irradiate the object to be processed,
The tool locus control unit is housed in the machining unit and oscillates a laser beam emitted from the opening in a non-circular vibration pattern to irradiate the object to be machined as the tool locus. The cutting machine according to claim 1 , wherein the trajectory of the beam spot of the beam is controlled. It is set based on the product shape information including the size and shape of the final processed product obtained by cutting the processing object, corresponds to the cutting tool for cutting the processing object, and has a non-circular shape. Based on a machining condition and a machining program that includes cutting tool information for changing the tool locus having during cutting, generate tool diameter correction information for correcting the tool diameter of the tool locus,
Based on the machining program, the machining conditions, and the tool radius correction information, generate a tool radius correction control signal including cutting machining correction conditions,
Generate a drive control signal based on the tool diameter correction control signal,
Controlling the tool path based on the drive control signal,
When the machining conditions include cutting tool information for switching the tool trajectory during cutting, a plurality of tool trajectories included in the machining conditions are recognized, and tool radius correction information including the plurality of tool trajectories. Produces
A tool locus interpolation period is set with respect to the switching time of the tool locus, and a tool locus in the tool locus interpolation period is set,
A cutting method in which, based on the drive control signal, the tool path is switched in stages via the tool path set in the tool path interpolation period, and the tool radius is corrected at the switching timing. Irradiate the processing object with a laser beam,
The cutting method according to claim 3 , wherein the tool path is controlled by vibrating the laser beam in a non-circular vibration pattern.

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