WO2014155727A1 - ワークの加工面評価方法、制御装置および工作機械 - Google Patents
ワークの加工面評価方法、制御装置および工作機械 Download PDFInfo
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- WO2014155727A1 WO2014155727A1 PCT/JP2013/059729 JP2013059729W WO2014155727A1 WO 2014155727 A1 WO2014155727 A1 WO 2014155727A1 JP 2013059729 W JP2013059729 W JP 2013059729W WO 2014155727 A1 WO2014155727 A1 WO 2014155727A1
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
- G05B19/00—Programme-control systems
- G05B19/02—Programme-control systems electric
- G05B19/18—Numerical control [NC], i.e. automatically operating machines, in particular machine tools, e.g. in a manufacturing environment, so as to execute positioning, movement or co-ordinated operations by means of programme data in numerical form
- G05B19/406—Numerical control [NC], i.e. automatically operating machines, in particular machine tools, e.g. in a manufacturing environment, so as to execute positioning, movement or co-ordinated operations by means of programme data in numerical form characterised by monitoring or safety
- G05B19/4069—Simulating machining process on screen
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
- G05B19/00—Programme-control systems
- G05B19/02—Programme-control systems electric
- G05B19/18—Numerical control [NC], i.e. automatically operating machines, in particular machine tools, e.g. in a manufacturing environment, so as to execute positioning, movement or co-ordinated operations by means of programme data in numerical form
- G05B19/4093—Numerical control [NC], i.e. automatically operating machines, in particular machine tools, e.g. in a manufacturing environment, so as to execute positioning, movement or co-ordinated operations by means of programme data in numerical form characterised by part programming, e.g. entry of geometrical information as taken from a technical drawing, combining this with machining and material information to obtain control information, named part programme, for the NC machine
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B11/00—Measuring arrangements characterised by the use of optical techniques
- G01B11/30—Measuring arrangements characterised by the use of optical techniques for measuring roughness or irregularity of surfaces
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B17/00—Measuring arrangements characterised by the use of infrasonic, sonic or ultrasonic vibrations
- G01B17/08—Measuring arrangements characterised by the use of infrasonic, sonic or ultrasonic vibrations for measuring roughness or irregularity of surfaces
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/17—Systems in which incident light is modified in accordance with the properties of the material investigated
- G01N21/47—Scattering, i.e. diffuse reflection
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/17—Systems in which incident light is modified in accordance with the properties of the material investigated
- G01N21/47—Scattering, i.e. diffuse reflection
- G01N21/4738—Diffuse reflection, e.g. also for testing fluids, fibrous materials
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06T—IMAGE DATA PROCESSING OR GENERATION, IN GENERAL
- G06T7/00—Image analysis
- G06T7/40—Analysis of texture
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
- G05B2219/00—Program-control systems
- G05B2219/30—Nc systems
- G05B2219/32—Operator till task planning
- G05B2219/32177—Computer assisted quality surveyance, caq
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
- G05B2219/00—Program-control systems
- G05B2219/30—Nc systems
- G05B2219/32—Operator till task planning
- G05B2219/32215—If detected shape not correct, simulate new machine, tool and adapt path
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
- G05B2219/00—Program-control systems
- G05B2219/30—Nc systems
- G05B2219/32—Operator till task planning
- G05B2219/32216—If machining not optimized, simulate new parameters and correct machining
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
- G05B2219/00—Program-control systems
- G05B2219/30—Nc systems
- G05B2219/35—Nc in input of data, input till input file format
- G05B2219/35346—VMMC: virtual machining measuring cell simulate machining process with modeled errors, error prediction
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
- G05B2219/00—Program-control systems
- G05B2219/30—Nc systems
- G05B2219/37—Measurements
- G05B2219/37402—Flatness, roughness of surface
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P90/00—Enabling technologies with a potential contribution to greenhouse gas [GHG] emissions mitigation
- Y02P90/02—Total factory control, e.g. smart factories, flexible manufacturing systems [FMS] or integrated manufacturing systems [IMS]
Definitions
- the present invention relates to a method for evaluating the surface shape of a workpiece machined by a machine tool, a control device for a machine tool using the evaluation method, and a machine tool provided with the control device.
- the evaluation standard of the workpiece machining surface is usually the accuracy of the machined workpiece surface, particularly the surface roughness.
- the lower the surface roughness of the processed surface the better the processing.
- the surface roughness of the processed workpiece is lower than the allowable surface roughness required by the user, when the observer visually observes the processing surface, the cusp stripes formed on the processing surface can be seen, or When the observer touches with a finger, the surface of the surface is rough, and the processed workpiece may be rejected. For this reason, techniques for measuring not only the surface roughness but also the glossiness and texture of the processed surface of the workpiece have been proposed.
- the cusp is generated by a small leftover or servo control generated on the work surface of the work when the work is picked up and cut with a rotary tool or with a bale tool. It is the minute unevenness of the machined surface caused by the vibration of the machine tool.
- Patent Document 1 a check pattern displayed on a display is projected onto a surface to be measured, a reflected image is captured by a photographing device, and the image data is captured by a computer using a specularity, a variation in specularity, a glossiness, A method is described in which a plurality of measurement items such as sharpness, waviness or shape error, contrast, and turbidity are automatically measured sequentially, and surface properties are evaluated using a plurality of measurement items including specularity as an index.
- Patent Document 1 describes a method of measuring surface properties using a specular gloss meter that measures glossiness with the amount of light received by regular reflection as a prior art.
- Patent Document 2 describes a method of measuring a surface texture by combining a shape maximum height (Rz) and a shape average wavelength (RSm) surface texture parameter.
- An object of the present invention is to solve such problems of the prior art, and a method for evaluating a machined surface in which the observer actually evaluates the quality of the machined surface of a machined workpiece with human senses, the evaluation It is an object of the present invention to provide a control device and a machine tool using the method.
- the machining surface of the workpiece is determined using an evaluation standard based on characteristics of human senses.
- a processed surface evaluation method for evaluation is provided.
- a machining surface shape simulation unit that simulates a machining surface formed on a workpiece by calculation, and a maximum brightness of reflected light on the machining surface And a minimum luminance
- a contrast calculation unit for calculating a contrast from the maximum luminance and the minimum luminance
- a spatial frequency calculation unit for calculating a spatial frequency of the processed surface
- a contrast sensitivity based on the contrast and the spatial frequency
- a machining surface shape simulation unit that simulates a machining surface formed on a workpiece by calculation and the machining surface shape simulation unit are simulated.
- the vibration stimulation frequency calculation unit calculates the frequency of the vibration stimulus transmitted to the observer's finger
- the processing surface is simulated by the processing surface shape simulation unit.
- the amplitude of the vibration stimulus transmitted to the observer's finger determined from the distance between the cusps of the cusp to be observed and the speed of the observer's finger corresponds to the frequency of the vibration stimulus calculated by the vibration stimulus frequency calculation unit.
- Width control device comprising a processing process change section for changing the machining process so as to disable sense in the human sense of touch.
- the three axes A driving mechanism for driving the feed shaft, an NC device for controlling the driving mechanism, and an evaluation device for simulating the machining surface formed on the workpiece and evaluating the machining surface
- the evaluation device calculates a machining surface shape simulation unit that simulates a machining surface formed on a workpiece by calculation, and calculates a maximum luminance and a minimum luminance of reflected light on the machining surface, and calculates a contrast from the maximum luminance and the minimum luminance.
- a machining process change unit for performing a tool path and machining conditions on the NC device based on the changed machining process. Machine tool so as to force is provided.
- the three axes A driving mechanism for driving the feed shaft, an NC device for controlling the driving mechanism, and an evaluation device for simulating the machining surface formed on the workpiece and evaluating the machining surface
- the processing surface shape simulation unit that simulates the processing surface formed on the workpiece by calculation
- the vibration stimulation frequency calculation unit for calculating the frequency of vibration stimulation transmitted to the finger and the distance between the cusps formed on the machining surface simulated by the machining surface shape simulation unit are transmitted to the observer's finger.
- a determination unit for determining whether the amplitude of the vibration stimulus is perceptible by a human tactile sense with respect to the frequency of the vibration stimulus calculated by the vibration stimulation frequency calculation unit;
- a machining process changing unit for changing the machining process so that the amplitude of the vibration stimulus is not detectable by human vision when it can be sensed by touch. And, machine tool so as to output the processing conditions and tool path in the NC device based on the changed machining process is provided.
- the processing surface of the workpiece is evaluated based on how the human (observer) eyes (sight) and fingers (tactile sense) actually perceive. Objective evaluation is possible when evaluating with. Then, it is possible to produce a workpiece with high customer satisfaction that is evaluated as good by human sense.
- the machined surface properties are predicted by simulation before actual machining, and the machined surface properties are automatically evaluated based on the above human sensory evaluation criteria, and it is predicted that there is a disturbance in the machined surface that can be sensed by human senses. If it is done, a control device that changes the machining process so that it cannot be sensed and a machine tool using the control device are provided, so it is possible to reduce workpiece machining defects and increase production efficiency. It becomes.
- FIG. 1 is a schematic block diagram of a machine tool according to a preferred embodiment of the present invention. It is a block diagram of the processing surface evaluation apparatus by the 1st Embodiment of this invention. It is the schematic for demonstrating contrast. It is the schematic for demonstrating a luminance ratio. It is a chart for demonstrating a contrast sensitivity function. It is the schematic for demonstrating the change method of a process. It is a chart which shows an example of process change. It is a chart which shows the other example of a process change. It is a block diagram of the processing surface evaluation apparatus by the 2nd Embodiment of this invention. It is a chart for demonstrating the frequency threshold value characteristic of a human tactile sense.
- a machine tool 50 includes a processing machine 60 and a processing surface evaluation apparatus 10 (30).
- the processing machine 60 has a bed 62 as a base fixed on the floor of the factory, a table 64 attached to the upper surface of the bed 62 and fixed with the work W on the upper surface, and a work W fixed on the bed 62.
- the spindle head 68 for supporting the spindle 66 on which the tool T is mounted at the tip end thereof so as to be rotatable about the vertical rotation axis O and the spindle head 68 are orthogonal to the bed 62 with respect to the X axis, the Y axis, and the Z axis.
- a drive mechanism 52 that reciprocates in three axes, an NC device 54 that controls a servo motor of the drive mechanism 52, a tool path that calculates and generates a tool path, and supplies data related to the generated tool path to the NC apparatus 54
- positioned between the calculation apparatus 56 and the tool path path calculation apparatus 56 and NC apparatus 54, and is supplied to NC apparatus 54 is comprised as a main component. To have.
- the drive mechanism 52 includes an X-axis, Y-axis, and Z-axis ball screw (not shown), a nut (not shown) that engages with the ball screw, and an X-axis, Y-axis, and Z-axis ball screw.
- the machine tool 50 includes an A axis that is a rotation feed axis centered on the horizontal X axis and a Z axis in the vertical direction in addition to the three linear feed axes orthogonal to the X axis, the Y axis, and the Z axis.
- One or a plurality of rotary feed shafts such as a C axis that is a rotary feed shaft centered on the axis may be included.
- the drive mechanism 52 includes servo motors for rotary feed axes such as the A axis and the C axis in addition to the X axis, Y axis, and Z axis drive motors Mx, My, and Mz.
- the tool path calculation device 56 can be configured by a CAM device connected to the CAD device 58 via a computer network 70 such as a LAN, for example, and a tool based on the shape data of the workpiece W generated by the CAD device 58. The path is calculated, and data related to the tool path is generated in the machining surface evaluation apparatus 10 (30).
- the tool path calculation device 56 may be incorporated as a part of a control program in the machine control device (not shown) of the processing machine 60 or the NC device 54.
- the machining surface evaluation apparatus 10 includes an input unit 12, a tool behavior simulation unit 14, a feed axis behavior simulation unit 16, a machining surface shape simulation unit 18, a contrast calculation unit 20, a spatial frequency.
- a calculation unit 22, a determination unit 24, and a process change unit 26 are provided as main components.
- the material for the work used in the machining process, the rotation speed of the spindle 66, the feed speed, the tool diameter of the tool T to be used, the tool length and the number of blades, the tool T into the work W Data 100 regarding machining conditions such as a cutting depth, a pick feed amount, or a feed axis feed speed correction value is input to the tool behavior simulation unit 14 and the feed axis behavior simulation unit 16.
- the input unit 12 is, for example, a computer network together with a keyboard (not shown), a touch panel (not shown), or a tool path calculation device 56 attached to a machine control device (not shown) of the NC device 54 or the processing machine 60. It can be configured by a database (not shown) stored in a server connected to.
- the tool behavior simulation unit 14 simulates the behavior of the tool T including the tilting and bending of the tool T and the revolving motion of the cutting edge tip by calculation based on the machining condition 100 input from the input unit 12.
- Data 104 related to the behavior of the tool T, which is a simulation result, is sent to the machined surface shape simulation unit 18 described later.
- the feed axis behavior simulation unit 16 is based on the tool path data 102 from the tool path calculation device 56 and the machining condition 100 input from the input unit 12, and includes three orthogonal feed axes of the X axis, the Y axis, and the Z axis. Simulate the behavior of rotary feed shafts such as A-axis and C-axis.
- the simulation result data 106 relating to the behavior of the feed axes such as the three linear feed axes orthogonal to the X, Y, and Z axes, and the rotary feed axes such as the A axis and C axis is the machining surface shape simulation. Sent to the unit 18.
- the machining surface shape simulation unit 18 simulates the removal of the chip from the surface of the workpiece W by the machining process.
- the height of the cusp formed on the processed surface of the workpiece W, the interval between adjacent cusps, the inclination angle of the cusp side surface, and the like are calculated.
- Data 108 related to the shape of the processed surface of the workpiece W, which is the calculation result, is sent to the contrast calculation unit 20 and the spatial frequency calculation unit 22.
- the contrast calculation unit 20 receives data on the material of the workpiece W from the input unit 12, data on the light source such as the illuminance, wavelength, and coordinates of the light source, and the angle of the line of sight when the assumed observer observes the workpiece. Data 110 including data regarding the observer is input.
- the workpiece W is, for example, a mold used in an injection molding machine, it is preferable to input data relating to a plastic material molded by the die instead of data relating to the material of the workpiece W.
- the contrast calculation unit 20 determines the maximum reflected light on the surface of the workpiece W based on the data 108 related to the shape of the machining surface of the workpiece W from the machining surface shape simulation unit 18 and the data 110 input from the input unit 12.
- the brightness Lmax and the minimum brightness Lmin are calculated, and the contrast of the surface of the workpiece W is calculated.
- the contrast m which is the calculation result, is sent to the determination unit 24.
- the contrast m is obtained from the following equation.
- m (Lmax ⁇ Lmin) / (Lmax + Lmin)
- Lmax maximum brightness (cd / m 2 )
- Lmin Minimum luminance (cd / m 2 ) It is.
- the luminance L is obtained from the following equation.
- L ⁇ ( ⁇ i, ⁇ r) ⁇ ( ⁇ / ⁇ ) ⁇ E here, ⁇ : Brightness ratio ⁇ i: Incident angle (deg) ⁇ r: Reflection angle (deg) ⁇ : reflectance
- E illuminance (lx) of incident light from the light source S It is.
- the luminance ratio ⁇ is the diffusion on the actual reflecting surface indicated by the broken line with respect to the luminance Lpd (line segment OP) of the constant perfect diffusing surface regardless of the direction of reflection as indicated by the two-dot chain line.
- the ratio of the luminance L ( ⁇ r) (line segment OS) of the sample surface in the direction of the reflection angle ⁇ r is constant regardless of the reflection direction, but on the actual reflection surface, the luminance changes depending on the reflection angle ⁇ r. Further, in the actual reflecting surface, the luminance varies depending on the incident angle ⁇ i and the material of the reflecting surface.
- the brightness of the reflected light is measured in advance for a plurality of reflection angles ⁇ r while changing the incident angle ⁇ i for various materials using a measuring device such as a luminance meter. Then, with the incident angle ⁇ i and the reflection angle ⁇ r as parameters, the luminance ratio ⁇ can be stored in the contrast calculation unit 20 as a table (database) or an approximate expression in association with various materials for the workpiece W.
- the contrast calculation unit 20 includes data 110 input from the input unit 12, in particular, a material for the workpiece W, a distance between the workpiece W and the eyes of the observer, an angle of the observer's line of sight, and a processed surface shape Based on the data 108 related to the machining surface from the simulation unit 18, the incident angle ⁇ i on the machining surface and the reflection angle ⁇ r on the machining surface are calculated, and the material for the workpiece W, the incident angle ⁇ i, and the reflection angle ⁇ r are calculated.
- the luminance ratio ⁇ ( ⁇ i, ⁇ r) is obtained, the maximum luminance Lmax and the minimum luminance Lmin are obtained from the luminance ratio ⁇ ( ⁇ i, ⁇ r), and the contrast m is obtained. be able to.
- the spatial frequency calculation unit 22 calculates the spatial frequency ⁇ based on the data 108 related to the shape of the processed surface of the workpiece W from the processed surface shape simulation unit 18.
- the spatial frequency ⁇ that is the calculation result is sent to the determination unit 24.
- the search method for the maximum brightness Lmax and the minimum brightness Lmin is to fix the line of sight and the processing surface, search for a place where the brightness is maximized while widening the viewing angle ⁇ , set the brightness at that time as the maximum brightness Lmax, and the viewing angle at that time
- the luminance on the opposite side from ⁇ is defined as the minimum luminance Lmin.
- the determination unit 24 uses the cusps on the surface of the workpiece W processed in the processing process as stripes to the human eye. Whether it is recognized or not is determined using a contrast sensitivity function.
- a contrast sensitivity function in general, human vision cannot identify a difference in luminance when the contrast is reduced.
- the minimum contrast that can distinguish this difference in luminance is generally referred to as a contrast threshold, and the inverse of the contrast threshold is referred to as contrast sensitivity.
- the contrast sensitivity changes depending on the spatial frequency, and the change of the contrast sensitivity with respect to the spatial frequency is generally referred to as a contrast sensitivity curve or a contrast sensitivity function Fcs. It is generally known that the contrast sensitivity function Fcs has an apex at a spatial frequency of about 4 cycles / degree, and the contrast sensitivity decreases regardless of whether the spatial frequency is higher or lower.
- the determination unit 24 determines the cusp of the machining surface of the workpiece W formed by the machining process based on the contrast m from the contrast calculation unit 20 and the spatial frequency ⁇ from the spatial frequency calculation unit 22. It is determined whether the fringe contrast is above the contrast sensitivity function Fcs (the fringes are not visible) or below (the fringes are visible).
- the contrast sensitivity function Fcs is different for each individual, but an appropriate contrast sensitivity function Fcs can be stored in the determination unit 24 in advance by experiments. Alternatively, a plurality of contrast sensitivity functions Fcs may be stored in the determination unit 24 so that the user can select as appropriate.
- the machining surface evaluation apparatus 10 sends data 118 related to the machining conditions input from the input unit 12 and the tool path generated by the tool path calculation apparatus 64 to the NC apparatus 62.
- the machined surface evaluation apparatus 10 allows the contrast of the cusp stripes to be above the contrast sensitivity function Fcs (the stripes are not visible) in a range where the surface roughness of the machined surface of the workpiece W satisfies the requirements.
- commands for changing the machining process are input to the input unit 12 (command 120 1 ), the tool behavior simulation unit 14 (command 120 2 ), the tool path calculation device 64 (command 120 3 ), and the feed axis behavior simulation unit 16 (command 120 4 ) Send to at least one of the above.
- the machining process can be changed by changing the rotation speed of the spindle 66, the feed speed of the feed axis, the tool diameter of the tool T to be used, the tool length and the number of blades, the cutting depth of the tool T into the workpiece W, the pick
- the bearing strength of the bearing that rotatably supports the main shaft 66 and the change of the tool path generated by the tool path calculation device 56 are included.
- the process changing unit 26 sets the contrast m The processing process is changed to a direction (a1) in which the spatial frequency ⁇ is decreased or in a direction (a2) in which the spatial frequency ⁇ is increased while the contrast m is decreased.
- the process changing unit 26 reduces the contrast m. The machining process is changed in the direction (b1) or in the direction (b2) in which the contrast m is decreased and the spatial frequency ⁇ is decreased.
- Process changes in the direction a1, b1 to reduce the contrast m can be carried out by outputting the command 120 1 to reduce the tool diameter of the tool T to be used to the input unit 12.
- a command 120 2 for reducing the magnetic force of the magnetic bearing is sent to the tool behavior simulation to reduce the rigidity of the bearing.
- the cusp of the entire processing surface can be increased, the local cusp can be made inconspicuous, and the contrast m can be reduced.
- an instruction 120 4 to reduce the acceleration of the feed shaft, thereby reducing the cusp height based on the position error during acceleration or deceleration of the feed shaft, The contrast m can be reduced.
- the machining surface evaluation apparatus 10 corrects the machining process until no stripes can be detected on the machining surface of the workpiece W by the observer's vision, that is, until the determination by the determination unit 24 becomes Yes. repeat.
- the fringes are visually determined by the observer using the contrast sensitivity function Fcs based on the contrast m and the spatial frequency ⁇ of the fringes mainly formed by the cusps formed on the processed surface of the workpiece W. It is determined whether or not it can be sensed, and the machining process is corrected until no stripes can be sensed on the machining surface by the observer's vision.
- vision particularly contrast sensitivity
- tactile sense particularly frequency threshold characteristics of tactile sensation are used as an evaluation criterion.
- FIG. 9 the same components as those in FIG. 2 are designated by the same reference numerals.
- the machining surface evaluation device 30 replaces the contrast calculation unit 20 and the spatial frequency calculation unit 22 of the machining surface evaluation device 10 of the first embodiment with a vibration stimulation frequency calculation unit. 32.
- the vibration stimulus frequency calculation unit 32 is input with the speed (relative speed with respect to the processing surface) 130 of the observer's finger sliding on the processing surface of the workpiece W from the input unit 12, and processing surface shape simulation is performed.
- Data 108 on the machined surface shape, particularly the distance between adjacent cusp vertices, is input from the unit 18.
- the vibration stimulation frequency calculation unit 32 calculates the frequency of vibration stimulation transmitted to the observer's finger based on the speed of the observer's finger and the distance between the cusps of adjacent cusps, and the vibration that is the calculation result. Data related to the stimulation frequency is sent to the determination unit 34. Further, the data 108 relating to the shape of the machined surface, in particular, the distance between the vertices of adjacent cusps, is sent from the machined surface shape simulation unit 18 to the determination unit 34.
- the determination unit 34 transmits the vibration stimulus transmitted to the observer's finger obtained from the vibration stimulus frequency from the vibration stimulus frequency calculation unit 32, the distance between the cusp vertices, and the observer's finger speed. Whether or not the observer can detect the cusp of the processed surface of the workpiece W formed by the processing process by touching it with a finger.
- the curve or function Fts indicating the frequency threshold characteristic of the tactile sensation shown in FIG. 10 is different for each individual, but an appropriate frequency threshold function Fts can be stored in the determination unit 34 beforehand by experiment. Alternatively, a plurality of frequency threshold functions Fts may be stored in the determination unit 24 so that the user can select as appropriate.
- the determination unit 34 determines whether the cusp of the processing surface of the workpiece W formed by the processing process is based on the frequency of the vibration stimulation and the distance between the cusps of adjacent cusps. It is determined whether the frequency threshold characteristic Fts is below (not feel cusps) or above (feels cusps), and the machining surface evaluation apparatus 30 observes in the same manner as in the first embodiment. The modification of the machining process is repeated until the cusp formed on the machining surface of the workpiece W cannot be sensed by the user's sense of touch, that is, until the judgment by the judgment unit 34 becomes Yes.
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Abstract
Description
前記評価装置が、ワークに形成される加工面を演算によってシミュレーションする加工面形状シミュレーション部と、前記加工面における反射光の最大輝度と最小輝度とを演算し、該最大輝度と最小輝度からコントラストを演算するコントラスト演算部と、前記加工面の空間周波数を演算する空間周波数演算部と、前記コントラストと前記空間周波数に基づき、コントラスト感度関数を用いて、前記加工面のコントラストがヒトの視覚にて感知可能であるか否かを判定する判定部と、前記加工面のコントラストがヒトの視覚にて感知可能な場合に、該加工面のコントラストがヒトの視覚にて感知不能なように加工プロセスを変更する加工プロセス変更部とを具備し、該変更された加工プロセスに基づいて前記NC装置に工具経路と加工条件を出力するようにした工作機械が提供される。
前記評価装置が、ワークに形成される加工面を演算によってシミュレーションする加工面形状シミュレーション部と、前記加工面形状シミュレーション部でシミュレーションされた加工面を観察者が指で触ったときに、観察者の指に伝達される振動刺激の周波数を演算する振動刺激周波数演算部と、前記加工面形状シミュレーション部でシミュレーションされた加工面に形成されるカスプの頂点間の距離から観察者の指に伝達される振動刺激の振幅が、前記振動刺激周波数演算部で演算された振動刺激の周波数に対して、ヒトの触覚で感知可能であるか否かを判定する判定部と、前記振動刺激の振幅がヒトの触覚で感知可能である場合に、振動刺激の振幅がヒトの視覚にて感知不能なように加工プロセスを変更する加工プロセス変更部とを具備し、該変更された加工プロセスに基づいて前記NC装置に工具経路と加工条件を出力するようにした工作機械が提供される。
図1において、工作機械50は、加工機60と、加工面評価装置10(30)とを具備している。加工機60は、工場の床面上に固定される基台としてのベッド62、該ベッド62の上面に取り付けられ上面にワークWが固定されるテーブル64、ベッド62に固定されたワークWに対面させた工具Tを先端部に装着する主軸66を鉛直な回転軸線Oを中心として回転可能に支持する主軸頭68、主軸頭68を、ベッド62に対してX軸、Y軸、Z軸の直交三軸方向に往復駆動する駆動機構52、駆動機構52のサーボモーターを制御するNC装置54、工具経路を演算、生成し、生成された工具経路に関連したデータをNC装置54へ供給する工具経路演算装置56、工具経路経路演算装置56とNC装置54との間に配設されNC装置54へ供給される工具経路情報を補正する加工面評価装置10(30)を主要な構成要素として具備している。
m=(Lmax-Lmin)/(Lmax+Lmin)
ここで
Lmax:最大輝度(cd/m2)
Lmin:最小輝度(cd/m2)
である。
また、輝度Lは、以下の式から得られる。
L=β(θi、θr)・(ρ/π)・E
ここで、
β:輝度比
θi:入射角(deg)
θr:反射角(deg)
ρ:反射率
E:光源Sからの入射光の照度(lx)
である。
12 入力部
14 工具挙動シミュレーション部
16 送り軸挙動シミュレーション部
18 加工面形状シミュレーション部
20 コントラスト演算部
22 空間周波数演算部
24 判定部
26 プロセス変更部
30 加工面評価装置
32 振動刺激周波数演算部
34 判定部
50 工作機械
56 工具経路演算装置
62 ベッド
64 テーブル
68 主軸頭
Claims (10)
- 加工したワークの加工面を評価する加工面評価方法において、
ヒトの感覚の特性に基づいた評価基準を用いて、前記ワークの加工面を評価することを特徴とした加工面評価方法。 - 前記ヒトの感覚は視覚である請求項1に記載の方法。
- 前記ヒトの感覚の特性は、ヒトの視覚の空間周波数に対するコントラスト感度である請求項1または2に記載の方法。
- ワークに形成される加工面を演算によってシミュレーションし、
前記加工面における反射光の最大輝度と最小輝度とを演算し、
前記最大輝度と最小輝度からコントラストを演算し、
前記加工面の空間周波数を演算し、
前記コントラストと前記空間周波数に基づき、コントラスト感度関数を用いて、前記加工面のコントラストがヒトの視覚にて感知可能であるか否かを判定するようにした請求項1~3の何れか1項に記載の方法。 - 前記ヒトの感覚は触覚である請求項1に記載の方法。
- 前記ヒトの感覚の特性は、振動刺激周波数の変化に対してヒトが振動刺激を感知する振動刺激の振幅の最小値である触覚の周波数閾値特性である請求項5に記載の方法。
- 工作機械の送り軸の制御装置において、
ワークに形成される加工面を演算によってシミュレーションする加工面形状シミュレーション部と、
前記加工面における反射光の最大輝度と最小輝度とを演算し、該最大輝度と最小輝度からコントラストを演算するコントラスト演算部と、
前記加工面の空間周波数を演算する空間周波数演算部と、
前記コントラストと前記空間周波数に基づき、コントラスト感度関数を用いて、前記加工面のコントラストがヒトの視覚にて感知可能であるか否かを判定する判定部と、
前記加工面のコントラストがヒトの視覚にて感知可能な場合に、該加工面のコントラストがヒトの視覚にて感知不能なように加工プロセスを変更する加工プロセス変更部とを具備することを特徴とした制御装置。 - 工作機械の送り軸の制御装置において、
ワークに形成される加工面を演算によってシミュレーションする加工面形状シミュレーション部と、
前記加工面形状シミュレーション部でシミュレーションされた加工面を観察者が指で触ったときに、観察者の指に伝達される振動刺激の周波数を演算する振動刺激周波数演算部と、
前記加工面形状シミュレーション部でシミュレーションされた加工面に形成されるカスプの頂点間の距離と、観察者の指の速度とから求まる観察者の指に伝達される振動刺激の振幅が、前記振動刺激周波数演算部で演算された振動刺激の周波数に対して、ヒトの触覚で感知可能であるか否かを判定する判定部と、
前記振動刺激の振幅がヒトの触覚で感知可能である場合に、振動刺激の振幅がヒトの触覚にて感知不能なように加工プロセスを変更する加工プロセス変更部とを具備することを特徴とした制御装置。 - ワークに対して工具を相対的に移動させるX軸、Y軸、Z軸の直交する少なくとも三軸の送り軸を有した工作機械において、
前記三軸の送り軸を駆動する駆動機構と、
前記駆動機構を制御するNC装置と、
ワークに形成される加工面をシミュレーションして、該加工面を評価する評価装置とを具備し、
前記評価装置が、
ワークに形成される加工面を演算によってシミュレーションする加工面形状シミュレーション部と、
前記加工面における反射光の最大輝度と最小輝度とを演算し、該最大輝度と最小輝度からコントラストを演算するコントラスト演算部と、
前記加工面の空間周波数を演算する空間周波数演算部と、
前記コントラストと前記空間周波数に基づき、コントラスト感度関数を用いて、前記加工面のコントラストがヒトの視覚にて感知可能であるか否かを判定する判定部と、
前記加工面のコントラストがヒトの視覚にて感知可能な場合に、該加工面のコントラストがヒトの視覚にて感知不能なように加工プロセスを変更する加工プロセス変更部とを具備し、該変更された加工プロセスに基づいて前記NC装置に工具経路と加工条件を出力することを特徴とした工作機械。 - ワークに対して工具を相対的に移動させるX軸、Y軸、Z軸の直交する少なくとも三軸の送り軸を有した工作機械において、
前記三軸の送り軸を駆動する駆動機構と、
前記駆動機構を制御するNC装置と、
ワークに形成される加工面をシミュレーションして、該加工面を評価する評価装置とを具備し、
前記評価装置が、
ワークに形成される加工面を演算によってシミュレーションする加工面形状シミュレーション部と、
前記加工面形状シミュレーション部でシミュレーションされた加工面を観察者が指で触ったときに、観察者の指に伝達される振動刺激の周波数を演算する振動刺激周波数演算部と、
前記加工面形状シミュレーション部でシミュレーションされた加工面に形成されるカスプの頂点間の距離から観察者の指に伝達される振動刺激の振幅が、前記振動刺激周波数演算部で演算された振動刺激の周波数に対して、ヒトの触覚で感知可能であるか否かを判定する判定部と、
前記振動刺激の振幅がヒトの触覚で感知可能である場合に、振動刺激の振幅がヒトの視覚にて感知不能なように加工プロセスを変更する加工プロセス変更部とを具備し、該変更された加工プロセスに基づいて前記NC装置に工具経路と加工条件を出力することを特徴とした工作機械。
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KR20150109483A (ko) | 2015-10-01 |
US20160054724A1 (en) | 2016-02-25 |
EP2980664A1 (en) | 2016-02-03 |
EP2980664A4 (en) | 2017-05-17 |
CN105051631A (zh) | 2015-11-11 |
JPWO2014155727A1 (ja) | 2017-02-16 |
EP2980664B1 (en) | 2020-03-18 |
US10018989B2 (en) | 2018-07-10 |
KR101748337B1 (ko) | 2017-06-16 |
CN105051631B (zh) | 2018-04-27 |
JP6062533B2 (ja) | 2017-01-18 |
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