JP2018073053A - Processing route computing device, processing route computing method and computer program - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a processing route computing device, etc., enabling a visual check of a slight asperity level of a model surface.SOLUTION: A processing route computing device that computes a processing route to process a workpiece on the basis of multiple command points which designate a position of a main shaft includes: a setting unit that sets an evaluation cross-section which intersects the processing route; an intersection point computing unit that computes an intersection point between the evaluation cross-section set by the setting unit and the processing route; a feature quantity computing unit that computes a feature quantity indicating an asperity level in a first region of a surface of the workpiece having undergone the processing with respect to the intersection point computed by the intersection point computing unit; a first creating unit that creates first image data in the first region on the basis of the feature quantity computed by the feature quantity computing unit; and a second creating unit that creates second image data in the first region on the basis of the feature quantity computed by the feature quantity computing unit in accordance with the feature quantity indicating the asperity level in a second region when a designation to the second region located within the first region is received.SELECTED DRAWING: Figure 17

Description

  The present invention relates to a machining path computation device, a machining path computation method, and a computer program for computing a spindle path for machining a workpiece.

  When the machine tool processes a workpiece, the processing unit calculates the machining path of the spindle before processing the workpiece, and calculates the shape (model) of the workpiece after processing based on the calculated processing path. The arithmetic unit generates a surface shape of the model based on the image data (rendering).

  The calculation device compares one pixel constituting the surface of the model with another pixel adjacent to the one pixel, obtains a change rate of the normal vector, and calculates a change rate of the direction of the surface. The arithmetic unit gives each pixel a color corresponding to the rate of change of the direction of the surface, in other words, the degree of unevenness of the surface. An operator can visually recognize a defect on the model surface (see, for example, Patent Document 1).

Japanese Patent No. 5666013

  However, when the minimum unit of the change rate is large, in other words, when the resolution of the change rate is large, the operator may not be able to visually recognize the slight unevenness of the model surface.

  The present invention has been made in view of such circumstances, and an object thereof is to provide a machining path calculation device, a machining path calculation method, and a computer program capable of visually recognizing a slight degree of unevenness on a model surface.

  A machining path calculation device according to the present invention is a machining path calculation device that calculates a machining path for machining a workpiece based on a plurality of command points that indicate a position of a spindle. A setting unit to be set, an intersection calculation unit for calculating an intersection of the evaluation cross section set by the setting unit and the machining path, and an intersection calculated by the intersection calculation unit in the first region of the workpiece surface after machining A feature quantity computing unit that computes a feature quantity indicating the degree of unevenness; a first generation unit that creates first image data in the first region based on the feature quantity computed by the feature quantity computation unit; When the designation of the second region located in one region is received, the first region is based on the feature amount calculated by the feature amount calculation unit according to the feature amount indicating the degree of unevenness in the second region. The second image in Characterized in that it comprises a second generator for generating a data.

  In the machining path calculation device according to the present invention, the first generation unit sets a color corresponding to each feature amount in the first region based on the maximum value and the minimum value of the feature amount in the first region, The first image data is generated based on the set color, and the second generation unit corresponds to each feature amount in the first region based on the maximum value and the minimum value of the feature amount in the second region. A color to be set is set, and the second image data is generated based on the set color.

  A machining path calculation device according to the present invention relates to an intersection position correction unit that corrects the position of an intersection calculated by the intersection calculation unit, and an intersection after correction by the intersection position correction unit, and a first region on a workpiece surface after machining A correction feature amount calculation unit that calculates a feature amount indicating the degree of unevenness in the image, and a third generation unit that generates first correction image data in the first region based on the feature amount calculated by the correction feature amount calculation unit When the designation of the second region located in the first region is received, based on the feature amount calculated by the correction feature amount calculation unit according to the feature amount indicating the degree of unevenness in the second region And a fourth generator for generating second corrected image data in the first region.

  In the machining path calculation device according to the present invention, the third generation unit sets a color corresponding to each feature amount in the first region based on the maximum value and the minimum value of the feature amount in the first region, The first corrected image data is generated based on the set color, and the fourth generation unit calculates the feature amount in the first region based on the maximum value and the minimum value of the feature amount in the second region. A corresponding color is set, and the second corrected image data is generated based on the set color.

  The processing path calculation device according to the present invention displays an image based on the first image data and an image based on the first corrected image data side by side on a display unit, and the image based on the second image data and the second corrected image An image based on data is displayed side by side on a display unit.

  A machining path calculation method according to the present invention is a machining path calculation method for calculating a machining path for machining a workpiece based on a plurality of command points that indicate a position of a spindle. Set, calculate the intersection of the set evaluation cross section and the machining path, calculate a feature amount indicating the degree of unevenness in the first region of the workpiece surface after processing, with respect to the calculated intersection point, based on the calculated feature amount, When the first image data in the first region is generated and the designation of the second region located in the first region is received, the feature is calculated according to the feature amount indicating the degree of unevenness in the second region. The second image data in the first region is generated based on the amount.

  The computer program according to the present invention is a computer program that can be executed by a machining path computing device that computes a machining path for machining a workpiece based on a plurality of command points that indicate the position of a spindle. Then, an evaluation cross section that intersects the machining path is set, the intersection of the set evaluation cross section and the machining path is calculated, and the feature amount indicating the degree of unevenness in the first region of the workpiece surface after processing is calculated with respect to the calculated intersection point. When the first image data in the first region is generated based on the calculated feature amount and designation of the second region located in the first region is received, the degree of unevenness in the second region is calculated. In accordance with the feature amount indicating, a process for generating the second image data in the first region is executed based on the calculated feature amount.

  In the present invention, with respect to the intersection between the evaluation cross section and the machining path, a feature value indicating the degree of unevenness in the first region of the workpiece surface after machining is calculated, and first image data corresponding to the calculated feature value is generated. When the operator specifies the second area in the first area, the second image data in the first area is generated based on the feature amount indicating the degree of unevenness in the second area. The processing path calculation device generates the second image data based on the feature amount of the second area narrower than the first area.

  In the present invention, the second generation unit sets a color corresponding to each feature amount in the first region based on the maximum value and the minimum value of the feature amount in the second region. Since the color is set for each feature quantity based on the maximum value and the minimum value of the feature quantity in the second area that is narrower than the first area, the first image data based on the feature quantity in the first area cannot be displayed. Further, the operator can visually recognize a slight unevenness degree in the second region.

  In the present invention, first corrected image data in the first region is generated with respect to the corrected intersection. Further, when the designation of the second area located in the first area is received, the second corrected image data in the first area is generated based on the feature amount indicating the degree of unevenness in the second area. Since the correction of the intersection is reflected in the image data, the operator can visually recognize the degree of unevenness considering the correction result.

  In the present invention, with respect to the corrected intersection, the fourth generation unit sets a color corresponding to each feature amount in the first region based on the maximum value and the minimum value of the feature amount in the second region. Since the color is set for each feature value based on the maximum value and the minimum value of the feature value in the second region that is narrower than the first region, the first value based on the feature value of the first region is used for the corrected intersection. The operator can visually recognize a slight degree of unevenness in the second area that could not be displayed by the image data.

  In the present invention, since the image based on the first image data and the image based on the first corrected image data are displayed side by side, the degree of unevenness of the workpiece surface before and after correction based on the feature amount of the first area is determined by the operator. Can be compared. In addition, since the image based on the second image data and the image based on the second corrected image data are displayed side by side, the operator must compare the degree of unevenness of the workpiece surface before and after correction based on the feature amount of the second area. Can do.

  In the machining path calculation device, the machining path calculation method, and the computer program according to the present invention, the feature amount indicating the degree of unevenness in the first region of the workpiece surface after machining is calculated with respect to the intersection of the evaluation section and the machining path. First image data corresponding to the calculated feature amount is generated. When the operator specifies the second area in the first area, the second image data in the first area is generated based on the feature amount indicating the degree of unevenness in the second area. The processing path calculation device generates the second image data based on the feature amount of the second area narrower than the first area. The second image data can display a slight unevenness degree in the second area that could not be displayed by the first image data based on the feature amount of the first area.

1 is a perspective view schematically showing a machine tool. It is a block diagram which briefly shows the structure of a control apparatus. It is a top view which shows schematically the processing path with respect to a workpiece | work, and an evaluation cross section. It is a perspective view which briefly shows the evaluation section to a work. It is a schematic diagram which shows a command point and the intersection of an evaluation cross section and a process path | route schematically. It is a conceptual diagram which shows an example of an intersection table. It is explanatory drawing explaining the calculation method which calculates the feature-value of the intersection on the evaluation cross section D. FIG. It is explanatory drawing explaining the 1st correction method of the intersection position on the evaluation cross section. It is explanatory drawing explaining the 2nd correction method of the intersection position on an evaluation cross section. It is explanatory drawing explaining the correction method of a command point. It is a front view which shows an example of the display part for displaying the workpiece | work shape after a process, and the unevenness | corrugation degree of the workpiece | work surface. It is a figure which shows an example of a color table. It is a front view which shows an example of the display part at the time of calling a program list. It is a front view which shows an example of the display part which displayed the workpiece | work W shape and the unevenness | corrugation degree of the workpiece | work W surface based on 1st image data and 1st correction image data. It is a front view which shows an example of the display part which displays the state which operated the area | region designation | designated button. It is a front view which shows an example of the display part which displays a 2nd area | region. It is a front view which shows an example of the display part which displayed the workpiece | work W shape and the unevenness | corrugation degree of the workpiece | work W surface based on 2nd image data and 2nd correction image data. It is a flowchart explaining the display process which displays the workpiece | work W shape and the unevenness | corrugation degree of the workpiece | work W surface. It is a figure which shows an example of the image displayed on a display part when an adjustment scale is operated.

(Embodiment 1)
Hereinafter, the present invention will be described with reference to the drawings showing a machine tool according to a first embodiment. In the following description, up and down, left and right, and front and rear indicated by arrows in the figure are used. FIG. 1 is a perspective view schematically showing a machine tool.

  The machine tool includes a rectangular base 1 extending forward and backward. A workpiece holding unit 3 that holds a workpiece W (see FIG. 3) is provided on the front side of the upper portion of the base 1. The work holding unit 3 can rotate around the A axis with the left-right direction as the axial direction and the C axis with the up-down direction as the axial direction.

  A support base 2 for supporting a column 4 described later is provided on the rear side of the upper part of the base 1. A Y-axis direction moving mechanism 10 that moves in the front-rear direction is provided on the upper portion of the support base 2. The Y-axis direction moving mechanism 10 includes two rails 11 extending in the front-rear direction, a Y-axis screw shaft 12, a Y-axis motor 13, and a bearing 14.

  The rails 11 are provided on the left and right of the upper part of the support base 2, respectively. The Y-axis screw shaft 12 extends in the front-rear direction and is provided between the two rails 11. A bearing 14 is provided at each of the front end portion and the middle portion of the Y-axis screw shaft 12. In addition, illustration of the bearing provided in the middle part is abbreviate | omitted. The Y-axis motor 13 is connected to the rear end portion of the Y-axis screw shaft 12.

  A nut (not shown) is screwed onto the Y-axis screw shaft 12 via a rolling element (not shown). The rolling element is, for example, a ball. A plurality of sliders 15 are slidably provided on each rail 11. A moving plate 16 is connected to the upper part of the nut and the slider 15. The moving plate 16 extends in the horizontal direction. As the Y-axis motor 13 rotates, the Y-axis screw shaft 12 rotates, the nut moves in the front-rear direction, and the moving plate 16 moves in the front-rear direction.

  An X-axis direction moving mechanism 20 that moves in the left-right direction is provided on the upper surface of the moving plate 16. The X-axis direction moving mechanism 20 includes two rails 21 extending left and right, an X-axis screw shaft 22, an X-axis motor (not shown), and a bearing 24.

  The rails 21 are provided at the front and rear sides of the upper surface of the movable plate 16. The X-axis screw shaft 22 extends left and right and is provided between the two rails 21. A bearing 24 is provided at each of the left end portion and midway portion of the X-axis screw shaft 22. In addition, description of the bearing provided in the middle part of the X-axis screw shaft 22 is abbreviate | omitted. The X-axis motor is connected to the right end portion of the X-axis screw shaft 22.

  A nut (not shown) is screwed onto the X-axis screw shaft 22 via a rolling element (not shown). Grease is applied to the X-axis screw shaft 22. A plurality of sliders 26 are slidably provided on each rail 21. The column 4 is connected to the upper part of the nut and the slider 26. Column 4 is columnar. As the X-axis motor rotates, the X-axis screw shaft 22 rotates, the nut moves in the left-right direction, and the column 4 moves in the left-right direction.

  A Z-axis direction moving mechanism 30 that moves in the vertical direction is provided on the front surface of the column 4. The Z-axis direction moving mechanism 30 includes two rails 31 extending vertically, a Z-axis screw shaft 32, a Z-axis motor 33, and a bearing 34.

  The rails 31 are provided on the left and right sides of the front surface of the column 4, respectively. The Z-axis screw shaft 32 extends vertically and is provided between the two rails 31. A bearing 34 is provided at each of a lower end portion and a midway portion of the Z-axis screw shaft 32. In addition, illustration of the bearing provided in the middle part is abbreviate | omitted. The Z-axis motor 33 is connected to the upper end portion of the Z-axis screw shaft 32.

  A nut (not shown) is screwed onto the Z-axis screw shaft 32 via a rolling element (not shown). Grease is applied to the Z-axis screw shaft 32. A plurality of sliders 35 are slidably provided on each rail 31. The spindle head 5 is connected to the front part of the nut and the slider 35. The Z-axis screw shaft 32 is rotated by the rotation of the Z-axis motor 33, the nut moves in the vertical direction, and the spindle head 5 moves in the vertical direction. The Z-axis motor 33, the Z-axis screw shaft 32, the nut and the rolling element constitute a ball screw mechanism.

  A main shaft 5 a extending vertically is provided in the main shaft head 5. The main shaft 5a rotates around the axis. A spindle motor 6 is provided at the upper end of the spindle head 5. A tool is attached to the lower end of the main shaft 5a. The spindle 5a is rotated by the rotation of the spindle motor 6, and the tool is rotated. The rotated tool processes the workpiece W held in the workpiece holder 3.

  The machine tool includes a tool changer (not shown) for changing tools. The tool changer exchanges a tool housed in a tool magazine (not shown) and a tool mounted on the spindle 5a.

FIG. 2 is a block diagram schematically showing the configuration of the control device 50. The control device 50 (machining path calculation device) includes a CPU 51, a storage unit 52, a RAM 53, and an input / output interface 54. The storage unit 52 is a rewritable memory, such as an EPROM or an EEPROM. The control device 50 controls the machine tool based on the control program stored in the storage unit 52. The storage unit 52 stores an intersection table, a color table, a path number i, a command point P _k , an intersection point S _i ^{d, and the} like which will be described later (d, i, and k are natural numbers). The control device 50 may include a ROM that stores a control program in advance.

  When the operator operates the operation unit 7, a signal is input from the operation unit 7 to the input / output interface 54. The operation unit 7 is a keyboard, a button, a touch panel, or the like, for example. The input / output interface 54 outputs a signal to the display unit 8. The display unit 8 displays characters, figures, symbols, and the like. The display unit 8 is, for example, a liquid crystal display panel.

  The control device 50 includes an X-axis control circuit 55 corresponding to the X-axis motor 23, a servo amplifier 55a, and a differentiator 23b. The X-axis motor 23 includes an encoder 23a. The X-axis control circuit 55 outputs a command indicating the amount of current to the servo amplifier 55a based on a command from the CPU 51. The servo amplifier 55a receives the command and outputs a drive current to the X-axis motor 23.

  The encoder 23 a outputs a position feedback signal to the X-axis control circuit 55. The X-axis control circuit 55 performs position feedback control based on the position feedback signal.

  The encoder 23a outputs a position feedback signal to the differentiator 23b, and the differentiator 23b converts the position feedback signal into a speed feedback signal and outputs it to the X-axis control circuit 55. The X-axis control circuit 55 performs speed feedback control based on the speed feedback signal.

  The current detector 55b detects the value of the drive current output from the servo amplifier 55a. The current detector 55 b feeds back the value of the drive current to the X axis control circuit 55. The X axis control circuit 55 executes current control based on the value of the drive current.

  The control device 50 includes a Y-axis control circuit 56 corresponding to the Y-axis motor 13, a servo amplifier 56a, and a differentiator 13b. The Y-axis motor 13 includes an encoder 13a. Based on the command from the CPU 51, the Y-axis control circuit 56 outputs a command indicating the current amount to the servo amplifier 56a. The servo amplifier 56 a receives the command and outputs a drive current to the Y-axis motor 13.

  The encoder 13 a outputs a position feedback signal to the Y-axis control circuit 56. The Y-axis control circuit 56 performs position feedback control based on the position feedback signal.

  The encoder 13a outputs a position feedback signal to the differentiator 13b, and the differentiator 13b converts the position feedback signal into a speed feedback signal and outputs it to the Y-axis control circuit 56. The Y-axis control circuit 56 executes speed feedback control based on the speed feedback signal.

  The current detector 56b detects the value of the drive current output from the servo amplifier 56a. The current detector 56 b feeds back the drive current value to the Y-axis control circuit 56. The Y axis control circuit 56 executes current control based on the value of the drive current.

  The control device 50 includes a Z-axis control circuit 57 corresponding to the Z-axis motor 33, a servo amplifier 57a, and a differentiator 33b. The Z-axis motor 33 includes an encoder 33a. Based on the command from the CPU 51, the Z-axis control circuit 57 outputs a command indicating the amount of current to the servo amplifier 57a. The servo amplifier 57a receives the command and outputs a drive current to the Z-axis motor 33.

  The encoder 33 a outputs a position feedback signal to the Z-axis control circuit 57. The Z-axis control circuit 57 performs position feedback control based on the position feedback signal.

  The encoder 33a outputs a position feedback signal to the differentiator 33b, and the differentiator 33b converts the position feedback signal into a speed feedback signal and outputs it to the Z-axis control circuit 57. The Z-axis control circuit 57 performs speed feedback control based on the speed feedback signal.

  The current detector 57b detects the value of the drive current output from the servo amplifier 57a. The current detector 57 b feeds back the value of the drive current to the Z-axis control circuit 57. The Z-axis control circuit 57 executes current control based on the drive current value.

  The control device 50 also performs feedback control similar to that of the X to Z axis motors 23, 13, and 33 with respect to the spindle motor 6.

  The machine tool includes a magazine motor 60 and a magazine control circuit 58. The tool magazine is driven by the rotation of the magazine motor 60. The magazine control circuit 58 controls the rotation of the magazine motor 60.

The storage unit 52 stores a machining program for machining the workpiece W. The machining program has a plurality of command points P _k that indicate the position of the spindle 5a. k indicates the order of instructions constituting the machining program. The spindle 5a sequentially moves a plurality of command points _Pk , and the tool mounted on the spindle 5a processes the workpiece W.

The storage unit 52 stores a command point P _k in advance. Based on the plurality of command points P _k , the control device 50 sets a path (machining path α) along which the main shaft 5a moves. The controller 50 executes the movement of the main shaft 5a based on the machining path α.

  A method for setting the machining path α will be described. 3 is a plan view schematically showing the machining path α and the evaluation section for the workpiece W, and FIG. 4 is a perspective view schematically showing the evaluation section for the workpiece W. In the figure, the X direction indicates the left-right direction, the Y direction indicates the front-rear direction, and the Z direction indicates the up-down direction. Moreover, the shape of the workpiece | work W in FIG.3 and FIG.4 has shown the shape after a process.

The control device 50 sets an evaluation section D ^d (d indicates a section number and is a natural number) for the workpiece W. As shown in FIG. 3, when most of the main shaft 5a reciprocates along the X direction, the machining path α is a path along the X direction. As shown in FIG. 3, the control device 50 sets a plurality of evaluation sections D ^d along a direction substantially orthogonal to the machining path α. A plurality of evaluation sections are arranged in the X direction. The operator instructs in advance that the machining path α is in the X direction.

FIG. 5 is a schematic diagram schematically showing the command point P _k , the intersection of the evaluation section D ^d and the machining path α, and FIG. 6 is a conceptual diagram showing an example of the intersection table. 5 and 6, “i” (i is a natural number) indicates a path number in the movement of the main shaft 5a in the X direction. As shown in FIG. 5, for example, a route with route number 1 (i = 1) indicates a route that moves from left to right, and a route with route number 2 (i = 2) wraps the route with route number 1 at the right end. The route from right to left is shown. The same applies to route numbers 3 and below. The main shaft 5a moves in the order of route numbers. ● indicates the command point, and ○ indicates the intersection of the evaluation section D ^d and the machining path α. The arrow indicates the traveling direction of the machining path α.

As shown in FIG. 6, the control device 50, each evaluation section D ^d, the moving path P _k -P _k + ₁ calculates the intersection S _i ^d and the path number i, the intersection S _i ^d coordinates (X Coordinate, Y coordinate and Z coordinate) and the movement path P _k -P _{k + 1} are associated with each other and stored in the intersection table. The X coordinate is a coordinate in the X direction, the Y coordinate is a coordinate in the Y direction, and the Z coordinate is a coordinate in the Z direction.

Controller 50, a feature value of the intersection on evaluation section D ^d, determined by the calculation method shown below, for example. FIG. 7 is an explanatory diagram for explaining a calculation method for calculating the feature amount of the intersection point on the evaluation section D ^d . Controller 50 may use the Z-coordinate of the intersection point S _i ^d of interest, the Z coordinate of the intersection point S _i intersections respectively positioned on both sides of ^d S _i-1 ^d and the intersection S _{i + 1} ^d, the intersection S Calculate the second-order difference of _i ^d . The Z coordinate of the intersection S _i-1 ^d is larger than the Z coordinate of the intersection S _i ^d . The Z coordinate of the intersection S _{i + 1} ^d is smaller than the Z coordinate of the intersection S _i ^d .

Controller 50 calculates the intersection S _i ^d Z coordinate z _i ^d and the intersection point S _{i + 1} ^d coordinate z _{i + 1} ^d of the difference d _a of ^{_{(d a = z i d -z}} i + 1 d) , calculates the intersection point S _i-1 ^d coordinate z _i-1 ^d and the intersection point S _i ^d coordinate z _i ^d of the difference d _b of the _{(d b = z i-1} d -z i d). The control device 50 calculates a difference d _a -difference d _b (second-order difference) between the difference d _a and the difference d _b . The control device 50 calculates a second-order difference for all intersections excluding the intersection located at the end in each evaluation section as the feature amount. The large / small size of the second-order difference corresponds to the large / small degree of unevenness of the workpiece surface after machining.

Controller 50 corrects the intersection position on the evaluation section D ^d for example, the first correction method. Figure 8 is an explanatory diagram for explaining a first method of correcting the intersection position on the evaluation section D ^d. The control device 50 corrects the intersection position so as to gradually change the coordinates in the Z direction, for example. Correction point t using the intersection coordinates s _i-2 ^d , s _i-1 ^d , s _{i + 1} ^d , s _{i + 2} ^d of the two points before and after the intersection coordinates S _i ^d to be corrected _i ^d is determined.

Each Z coordinate value of the four intersection coordinates s _i-2 ^d , s _i-1 ^d , s _{i + 1} ^d , s _{i + 2} ^d is expressed as z _i-2 , z _i-1 , z _{i + 1} , z _{i. +2} , Z coordinate value of correction point t _i ^d is z _i ′, Z coordinate value difference is d ₁ = z _i−2 −z _i−1 , d ₂ = z _i−1 −z _i , d ₃ = z _i ′ −z _{i + 1} and d ₄ = z _{i + 1} −z _{i + 2} . Calculates z _i ′ such that the two-fold differences d ₁₂ ′, d ₂₃ ′, d ₃₄ ′ (differences in Z coordinate values d ₁ , d ₂ , d ₃ , d ₄ ) change linearly. To do.

The two-time differences d ₁₂ ′, d ₂₃ ′, and d ₃₄ ′ of the Z coordinate value are obtained by the following equations.
d ₁₂ ′ = d ₂ −d ₁ = (z _i−1 −z _i ′) − (z _i−2 −z _i−1 ) = 2 z _i−1 −z _i ′ −z _i−2. 1)
d ₂₃ ′ = d ₃ −d ₂ = (z _i ′ −z _{i + 1} ) − (z _i−1 −z _i ′) = 2 z _i ′ −z _{i + 1} −z _i−1 (2) )
d ₃₄ ′ = d ₄ −d ₃ = (z _{i + 1} −z _{i + 2} ) − (z _i ′ −z _{i + 1} ) = 2 z _{i + 1} −z _{i + 2} −z _i ′ (3)

Since these change linearly,
d ₂₃ ′ = (d ₁₂ ′ + d ₃₄ ′) / 2 (4)
Meet.

Solving z _i ′ based on the equations (1) to (4),
z _i ′ = (− z _i−2 + 4z _i−1 + 4z _{i + 1} −z _{i + 2} ) / 6
It becomes.

Performing the correction for all the intersections S _i ^d on evaluation section D ^d. Note that it is possible to correct only intersections whose Z coordinate values are far apart compared to the Z coordinate values of other intersections.

Controller 50 corrects the intersection position on the evaluation section D ^d for example in the second correction method. FIG. 9 is an explanatory diagram for explaining a second correction method of the intersection position on the evaluation cross section. In FIG. 9, u corresponds to an XY coordinate, and v corresponds to a Z coordinate. The control device 50 creates a smooth curve (spline curve, Bezier curve, NURBS curve, etc.) using a plurality of other intersections around the intersection S _i ^d to be corrected, for example. Project the intersection S _i ^d to be corrected.

When the four intersections s _i-2 ^d , s _i-1 ^d , s _{i + 1} ^d , s _{i + 2} ^d are used as smooth curves, the section s _i-2 on the evaluation section D ^d (uv plane) ^{d to} s _i-1 ^d , sections s _i-1 ^{d to} s _{i + 1} ^d , sections s _{i + 1} ^{d to} s _{i + 2} ^d , respectively, v ₁ (u), v ₂ (u), v ₃ (u) is represented by the following equation.
v _j (u) = a _j (u−u _j ) ³ + b _j (u−u _j ) ² + c _j (u−u _j ) + d _j
(J = 1, 2, 3)

Based on the fact that the first and second derivatives at the boundary points are continuous, passing through the intersections s _i-2 ^d , s _i-1 ^d , s _{i + 1} ^d , s _{i + 2} ^d 50 can determine a _{j to} d _j .

The selection of the four intersection points is not limited to the case of using two consecutive points located on both sides of the intersection point S _i ^d as described above. For example, intersection points may be selected discontinuously at every two points, such as intersection points s _i-3 ^d , s _i-1 ^d , s _{i + 1} ^d , and s _{i + 3} ^d .

As shown in FIG. 9, the correction point t _i ^d position is a position on the smooth curve where the distance from the intersection S _i ^d to be corrected is the minimum. Following the correction point t _i ^d is also referred to as a point of intersection t _i ^d. For example, the control device 50 calculates the second-order difference of the intersection t _i ^d as the corrected feature amount.

A corrected intersection point group existing on the d-th evaluation section D ^{d is} defined as T ^d .
T ^d = {t _i ^d | d: section number, i: route number}

The control device 50 corrects the position of the command point using ^Td as the intersection group. FIG. 10 is an explanatory diagram for explaining a method of correcting a command point. In FIG. 10, p _{a to} p _f indicate command points.

For example, when the command point _pc is a correction target, as shown in FIG. 10A, the command point _pc is located between the section D ^d-1 and the section D ^d and the path number is i. Controller 50 refers to the intersection table described above, to obtain the cross-sectional location and path numbers for command points p _c.

As shown in FIG. 10B, the intersection control device 50 surrounding the command point p _c, for example, four intersection points aligned on the machining path ^{_{α t i d + 1, t}} i d, t i d-1, t i d Search for ^-2 . The control device 50 creates a smooth curve (spline curve, Bezier curve, NURBS curve, etc.) from the four intersection points t _i ^{d + 1} , t _i ^d , t _i ^d-1 , t _i ^d-2 , The command point p _c is projected onto, and the correction point p _c ′ is determined. The control device 50 obtains a smooth curve by a method similar to the second correction method described above. Position correction point p _c 'is on a smooth curve, the distance from the command point p _c is the smallest position. The control device 50 corrects the positions of other command points in the same manner.

  CPU51 displays the workpiece | work W shape after a process, and the unevenness | corrugation degree of the workpiece | work W surface on the display part 8 based on a process program. FIG. 11 is a front view illustrating an example of the display unit 8 for displaying the workpiece W shape after machining and the degree of unevenness of the workpiece W surface.

  As shown in FIG. 11, when displaying the workpiece W shape after processing and the unevenness degree of the surface of the workpiece W, the display unit 8 displays the first shape of the workpiece W shape before correction and the unevenness degree of the surface of the workpiece W. 81, a second display screen 82 for displaying the corrected work W shape and the degree of unevenness on the surface of the work W, a program selection button 83 for selecting a machining program, an area specifying button 84 for specifying an area, an unevenness on the surface of the work W An uneven scale 85 indicating the degree, an adjustment scale 86 for adjusting the scale range of the uneven scale 85, a display reset button 87 for resetting the display, and the like are displayed.

  The first display scene 81 and the second display screen 82 are arranged side by side. The uneven scale 85 is arranged below the first display screen 81 and the second display screen 82. The concavo-convex scale 85 includes a rectangular color display portion 85f, a minimum value display portion 85a, a first intermediate value display portion 85b, a median value display portion 85c, a second intermediate value display portion 85d, and a maximum value display portion 85e that extend to the left and right. Prepare. The minimum value display portion 85a, the first intermediate value display portion 85b, the median value display portion 85c, the second intermediate value display portion 85d, and the maximum value display portion 85e are arranged below the color display portion 85f, and are in an initial state. Is blank.

  The minimum value display portion 85a, the first intermediate value display portion 85b, the median value display portion 85c, the second intermediate value display portion 85d, and the maximum value display portion 85e are the maximum value, the minimum value, the maximum value, and the feature value in the predetermined area. The median value between the minimum values, the first intermediate value between the minimum value and the median value, and the second intermediate value between the maximum value and the median value are displayed.

  FIG. 12 is a diagram illustrating an example of a color table. The storage unit 52 stores a color table. The color table shows a correspondence relationship between feature amounts and color ratios (red: green: blue). The color ratio of the minimum value of the feature amount is 0: 0: 1 and corresponds to blue. The color ratio of the first intermediate value is 0: 1: 1 and corresponds to cyan. The median color ratio is 0: 1: 0, corresponding to green. The color ratio of the second intermediate value is 1: 1: 0, corresponding to yellow. The maximum color ratio is 1: 0: 0, corresponding to red.

  The feature amount between the minimum value and the first intermediate value is 0: 0 to 1: 1, and corresponds to blue to cyan. As the feature amount increases, the green ratio increases linearly. The feature amount between the first intermediate value and the median value is 0: 1: 1 to 0, corresponding to cyan to green. As the feature amount increases, the blue ratio decreases linearly. The feature amount between the median and the second intermediate value is 0 to 1: 1: 0, corresponding to green to yellow. As the feature amount increases, the red ratio increases linearly. The feature amount between the second intermediate value and the maximum value is 1: 1 to 0: 0, which corresponds to yellow to red. As the feature amount increases, the green percentage decreases linearly.

  The color display unit 85f displays a color corresponding to the color table. The color display portion 85f has blue, cyan, green at locations corresponding to the minimum value display portion 85a, the first intermediate value display portion 85b, the median value display portion 85c, the second intermediate value display portion 85d, and the maximum value display portion 85e. , Yellow and red are displayed respectively. A color is displayed so that it continuously changes from blue to cyan at a corresponding position between the minimum value display portion 85a and the first intermediate value display portion 85b. Colors are displayed so as to continuously change from cyan to green at a corresponding position between the first intermediate value display portion 85b and the median value display portion 85c. The color is displayed so as to continuously change from green to yellow at a location corresponding to between the median value display portion 85c and the second intermediate value display portion 85d. The color is displayed so as to continuously change from yellow to red at a portion corresponding to between the second intermediate value display portion 85d and the maximum value display portion 85e.

  The adjustment scale 86 includes an adjustment unit 86a for adjusting the minimum value and the maximum value used in the concavo-convex scale 85, and a range display unit 86b indicating a range between the minimum value and the maximum value adjusted by the adjustment unit 86a. .

  FIG. 13 is a front view showing an example of the display unit 8 when the program list 90 is called. When displaying the processed workpiece W shape and the degree of unevenness of the workpiece W surface, the operator operates the program selection button 83 by the operation unit 7 to call the program list 90.

  The program list 90 includes a program display unit 91, a pre-correction button 92, a post-correction button 93, a pre-correction button 94, and a cancel button 95. The program display unit 91 shows one or a plurality of machining programs. The operator operates the operation unit 7 to select any machining program.

  When the operator selects the pre-correction button 92 by operating the operation unit 7 after selecting the machining program, the CPU 51 recognizes the entire area of the workpiece W as the first area R1, and based on the selected machining program, The feature amount of the intersection before correction in one region R1 is calculated, and the workpiece W shape before correction and the unevenness degree of the surface of the workpiece W are displayed on the display unit 8. In other words, the first image data in the first region R1 is generated based on the feature amount indicating the degree of unevenness in the first region R1 on the surface of the workpiece W after processing.

  After selecting the machining program, when the operator operates the operation unit 7 and selects the corrected button 93, the CPU 51 recognizes the entire area of the workpiece W as the first area R1, and based on the selected machining program, the first Correction is performed on the intersection before correction in the region R1, the feature amount of the intersection after correction is calculated, and first corrected image data in the first region R1 is generated. Based on the first corrected image data, the CPU 51 displays the corrected workpiece W shape and the degree of unevenness of the workpiece W surface on the display unit 8.

  After the selection of the machining program, when the operator operates the operation unit 7 and selects the correction back and forth button 94, the CPU 51 recognizes the entire area of the workpiece W as the first area R1, and based on the selected machining program, the above-described processing is performed. As described above, the feature values of the intersections before and after the correction in the first region R1 are respectively calculated, the first image data and the first corrected image data are generated, and the first display screen 81 and the second display screen 82 are corrected. The previous workpiece W shape and the unevenness degree of the workpiece W surface, and the corrected workpiece W shape and the unevenness degree of the workpiece W surface are displayed side by side.

  When the operator selects the cancel button 95, the CPU 51 deletes the program list 90 from the display unit 8. The CPU 51 recognizes the entire area of the work W as the first area R1, but may recognize an area narrower than the entire area as the first area R1.

  A case will be described in which after the machining program is selected, the operator operates the operation unit 7 and selects the correction back and forth button 94. FIG. 14 is a front view illustrating an example of the display unit 8 that displays the shape of the workpiece W and the degree of unevenness of the surface of the workpiece W based on the first image data and the first corrected image data.

The CPU 51 acquires the minimum value and the maximum value of the feature amount from the selected processing program, and calculates the first intermediate value, the second intermediate value, and the median value. For example, the calculation is performed as follows.
First intermediate value = minimum value + (maximum value−minimum value) / 4 (5)
Median value = minimum value + (maximum value−minimum value) / 2 (6)
Second intermediate value = minimum value + 3 (maximum value-minimum value) / 4 (7)
The minimum value and the maximum value are the minimum value and the maximum value before correction.

  For example, when the minimum value is −0.30547 and the maximum value is 0.34748, the first intermediate value, the median value, and the second intermediate value are −0.14223, 0.02101, and 0.18423, respectively. As shown in FIG. 14, the CPU 51 sets −0.30547, −0.30547 to the minimum value display portion 85a, the first intermediate value display portion 85b, the median value display portion 85c, the second intermediate value display portion 85d, and the maximum value display portion 85e. 0.14223, 0.02101, 0.18423, and 0.34748 are displayed respectively.

  The CPU 51 creates a color table based on the calculated minimum value, maximum value, first intermediate value, median value, and second intermediate value (see FIG. 12) and stores them in the storage unit 52. As shown in FIG. 14, the CPU 51 displays the workpiece W shape before correction on the first display screen 81 and displays the workpiece W shape after correction on the second display screen 82.

  The CPU 51 calculates the feature amount of each part of the workpiece W before correction, refers to the color table stored in the storage unit 52, and sets the color corresponding to the calculated feature amount to the part on the first display screen 81. And the degree of unevenness on the surface of the workpiece W is displayed. The feature amount of each part of the workpiece W before correction and the color table stored in the storage unit 52 constitute first image data. That is, the CPU 51 generates first image data, and displays the workpiece W shape and the unevenness degree of the surface of the workpiece W on the first display screen 81 based on the generated first image data.

  Further, the feature amount of each part constituting the corrected workpiece W is calculated, and the color corresponding to the calculated feature amount is displayed on the part on the second display screen 82 by referring to the color table stored in the storage unit 52. Display the degree of unevenness on the surface of the workpiece W. The feature amount of each part of the workpiece W after correction and the color table stored in the storage unit 52 constitute first corrected image data. That is, the CPU 51 generates first corrected image data, and displays the workpiece W shape and the unevenness degree of the surface of the workpiece W on the second display screen 82 based on the generated first corrected image data.

  For example, the work W displayed on the first display screen 81 has a red region R, a yellow region Y, a cyan region C, and a blue region B, and the other region is a green region G. For example, the work W displayed on the second display screen 82 has a yellow region Y and a cyan region C, and the other regions are green regions G. That is, the feature amount of the red region R (the feature amount near the maximum value) is changed to the feature amount of the yellow region Y (the feature amount near the second intermediate value) by the correction, and the feature amount of the blue region B (minimum value) The feature amount in the vicinity of the value) is changed to the feature amount in the cyan region C (the feature amount in the vicinity of the first intermediate value).

  FIG. 15 is a front view illustrating an example of the display unit 8 that displays a state in which the region designation button 84 is operated. The operator designates the area of the work W as necessary. As shown in FIG. 15, the operator operates the operation unit 7 to operate the area designation button 84. When the operator operates the area designation button 84, the CPU 51 starts accepting the area designation.

  FIG. 16 is a front view illustrating an example of the display unit 8 that displays the second region R2. As shown in FIG. 16, the operator operates the operation unit 7 to specify the start point S and the end point E. The CPU 51 recognizes a square area having a diagonal line connecting the start point S and the end point E as the second area R2, and displays the second area R2 on the display unit 8. The second region R2 is located in the first region R1.

  FIG. 17 is a front view showing an example of the display unit 8 displaying the workpiece W shape and the degree of unevenness of the workpiece W surface based on the second image data and the second corrected image data. The CPU 51 calculates feature amounts for all sampling points in the second region R2, sets the minimum feature amount among the calculated feature amounts to the minimum value used by the uneven scale 85, and sets the maximum feature amount to the uneven scale 85. Set to the maximum value used in.

  The CPU 51 calculates the first intermediate value, the median value, and the second intermediate value based on the minimum value and the maximum value of the feature amount in the second region R2 and the above-described equations (5) to (7). For example, when the minimum value and the maximum value of the feature amount in the second region R2 are −0.10027 and 0.12430, respectively, the first intermediate value is −0.04413, the median value is 0.01202, The second intermediate value is 0.06816. The CPU 51 creates a color table by associating the calculated minimum value, first intermediate value, median value, second intermediate value, and maximum value with blue, cyan, green, yellow, and red, and stores them in the storage unit 52. Store (see FIG. 12).

  The feature amount of each part of the workpiece W before correction and the color table stored in the storage unit 52 constitute second image data. That is, the CPU 51 generates the second image data in the first region R1 before correction based on the feature amount indicating the degree of unevenness in the second region R2, and the first image data based on the generated second image data. The display screen 81 displays the shape of the workpiece W and the degree of unevenness. As shown in FIG. 17, the CPU 51 displays a minimum value, a first intermediate value, a median value, a second intermediate value, and a maximum value as a minimum value display unit 85a, a first intermediate value display unit 85b, a median value display unit 85c, They are displayed on the two intermediate value display portion 85d and the maximum value display portion 85e, respectively. The CPU 51 displays a color corresponding to the feature value of each part in the first region R1 (color corresponding to the feature value in the color display unit 85f) on the first display screen 81, and the degree of unevenness of the workpiece W is displayed. indicate.

  Further, the feature amount of each part constituting the corrected workpiece W is calculated, and the color corresponding to the calculated feature amount is displayed on the part on the second display screen 82 by referring to the color table stored in the storage unit 52. Display the degree of unevenness on the surface of the workpiece W. The feature amount of each part of the workpiece W after correction and the color table stored in the storage unit 52 constitute second corrected image data. That is, the CPU 51 generates second corrected image data, and displays the workpiece W shape and the unevenness degree of the workpiece W surface on the second display screen 82 based on the generated second corrected image data.

  When the operator specifies the second region R2, the CPU 51 changes the maximum value and the minimum value set on the unevenness scale 85 from the maximum value and the minimum value in the first region R1 to the maximum value and the minimum value in the second region R2. The second image data and the second corrected image data are generated. Based on the second image data and the second corrected image data, the CPU 51 sets again the color to be displayed on each part of the entire workpiece W.

  Before changing the maximum value and the minimum value, the entire second region R2 of the first display screen 81 was the green region G (see FIG. 16), but after changing the maximum value and the minimum value, the second region R2 A red region R and a blue region B appeared in R2 (see FIG. 17). When the second region R2 is set, the CPU 51 sets a color for each feature amount based on the maximum value and the minimum value of the feature amount in the second region R2 narrower than the first region R1, and generates the second image data. To do. Therefore, in the second image data, the operator can visually recognize a slight degree of unevenness in the second region R2 that could not be displayed by the first image data based on the feature amount of the first region R1.

  The CPU 51 generates second corrected image data indicating the corrected work W shape and the degree of unevenness in the first region R1 based on the feature amount of the second region R2. As shown in FIG. 17, the CPU 51 displays the corrected workpiece W shape and the degree of unevenness of the workpiece W surface on the second display screen 82 based on the second corrected image data.

  FIG. 18 is a flowchart for explaining display processing for displaying the workpiece W shape and the unevenness degree of the workpiece W surface. In the initial state, the display unit 8 displays the image shown in FIG. The CPU 51 determines whether or not the machining program has been called by operating the program selection button 83 (step S1). If the machining program has not been called (step S1: NO), the process returns to step S1. When the machining program is called (step S1: YES), the CPU 51 displays a program list 90 on the display unit 8 (see step S2, FIG. 13).

  The CPU 51 determines whether the operator has selected any machining program displayed on the program display unit 91 (step S3). If any machining program is not selected (step S3: NO), the CPU 51 determines whether or not the operator has operated the cancel button 95 (step S5). When the cancel button 95 is not operated (step S5: NO), the CPU 51 returns the process to step S3.

  When the cancel button 95 is operated (step S5: YES), the CPU 51 deletes the program list 90 from the display unit 8 (step S6), and returns the process to step S1.

  If any machining program is selected in step S3 (step S3: YES), the CPU 51 determines whether or not the operator has operated the pre-correction button 92, the post-correction button 93 or the pre-correction button 94 (step). S4). When the operator does not operate the pre-correction button 92, the post-correction button 93, or the pre-correction button 94 (step S4: NO), the CPU 51 advances the process to step S5.

  When the operator operates the pre-correction button 92, the post-correction button 93, or the pre-correction button 94 (step S4: YES), the CPU 51 reads the selected machining program (step S7) and determines the feature amount of the workpiece W. The color table is created by calculation and stored in the storage unit 52 (step S8, see FIG. 12).

  The CPU 51 displays the workpiece W shape on the display unit 8, refers to the color table stored in the storage unit 52, displays a color corresponding to the feature amount of the workpiece W on the workpiece W, and displays the workpiece W on the display unit 8. The degree of unevenness on the surface is displayed (step S9: see FIG. 14).

  The CPU 51 determines whether or not the operator has operated the area designation button 84 to set the start point S and end point E and designated the area (second area R2) (step S10). When the area designation is executed (step S10: YES and see FIGS. 15 and 16), the CPU 51 creates a color table again based on the feature amount of the second area R2 and stores it in the storage unit 52 (step S11). Then, the process returns to step S9. In step S9, the CPU 51 refers to the color table based on the feature amount of the second region R2 stored in the storage unit 52, and displays the workpiece W shape and the unevenness degree of the surface of the workpiece W in the first region R1 (see FIG. 17). ). When the area designation is not executed (step S10: NO), the CPU 51 ends the process.

  FIG. 19 is a diagram illustrating an example of an image displayed on the display unit 8 when the adjustment scale 86 is operated. The operator can operate the adjustment scale 86 via the operation unit 7 to change the maximum value or the minimum value in the color table.

  For example, when the numerical value of the adjustment unit 86a or the length of the horizontally long rectangle of the range display unit 86b is changed and the minimum value of the adjustment scale 86 is changed to 25.0%, the initial maximum value and the minimum value are changed to the initial minimum value. The CPU 51 sets a value obtained by adding 25% of the value difference (that is, the initial first intermediate value) as the minimum value.

  As shown in FIG. 14, when the initial minimum value is −0.30547, the initial maximum value is 0.34748, and the minimum value of the adjustment scale 86 is changed to 25.0%, FIG. As shown, the minimum value is -0.14223 (initial first intermediate value), and the CPU 51 recalculates the first intermediate value, median value, and second intermediate value, and recreates the color table. The operator can change the maximum value of the adjustment scale 86.

  In the control device for a machine tool according to the embodiment, the feature amount indicating the degree of unevenness in the first region R1 on the surface of the workpiece W after processing is calculated and calculated with respect to the intersection between the evaluation section and the processing path α. First image data corresponding to the feature amount is generated. When the operator designates the second region R2 in the first region R1, the second image data in the first region R1 is generated based on the feature amount indicating the degree of unevenness in the second region R2. The processing path calculation device generates second image data based on the feature amount of the second region R2 that is narrower than the first region R1. The second image data can display a slight degree of unevenness in the second region R2 that could not be displayed by the first image data based on the feature amount of the first region R1.

  Further, the control device creates a color table based on the maximum value and the minimum value of the feature amount in the second region R2, and sets a color corresponding to each feature amount in the first region R1 based on the color table. . Since the color is set for each feature amount based on the maximum value and the minimum value of the feature amount in the second region R2 narrower than the first region R1, the first image data based on the feature amount in the first region R1 The operator can visually recognize a slight degree of unevenness in the second region R2 that could not be displayed.

  With respect to the corrected intersection, first corrected image data in the first region R1 is generated. The CPU 51 displays the workpiece W shape and the degree of unevenness of the workpiece W surface on the second display screen 82 based on the first corrected image data. When the designation of the second region R2 located in the first region R1 is received, the second corrected image data in the first region R1 is generated based on the feature amount indicating the degree of unevenness in the second region R2. The CPU 51 displays the workpiece W shape and the unevenness degree of the workpiece W surface on the second display screen 82 based on the second corrected image data. Since the correction of the intersection is reflected in the first and second corrected image data, the operator can visually recognize the degree of unevenness considering the correction result.

  Further, with respect to the corrected intersection, the control device 50 sets a color corresponding to each feature amount in the first region R1 based on the maximum value and the minimum value of the feature amount in the second region R2. Since the color is set for each feature amount based on the maximum value and the minimum value of the feature amount in the second region R2 that is narrower than the first region R1, with respect to the corrected intersection, the feature amount of the first region R1 is used as a reference. The operator can visually recognize a slight degree of unevenness in the second region R2 that could not be displayed with the first image data.

  An image based on the uncorrected image data (first image data) generated based on the feature amount of the first region R1 and the corrected image data (first image) generated based on the feature amount of the first region R1. Since the images based on (1 corrected image data) are displayed side by side on the first display screen 81 and the second display screen 82, the unevenness degree of the surface of the workpiece W on the basis of the feature amount of the first region R1 before and after the correction is displayed. Workers can compare. In addition, an image based on the uncorrected image data (second image data) generated based on the feature amount of the second region R2, and an image data after correction (first image) generated based on the feature amount of the second region R2. Since the images based on (2 corrected image data) are displayed side by side on the first display screen 81 and the second display screen 82, the unevenness degree of the surface of the workpiece W based on the feature amount of the second region R2 before and after the correction is displayed. Workers can compare.

  It should be thought that embodiment disclosed this time is an illustration and restrictive at no points. The technical features described in each embodiment can be combined with each other, and the scope of the present invention is intended to include all modifications within the scope of claims and the scope equivalent to the scope of claims. Is done.

5a Spindle 7 Operation unit 8 Display unit 50 Control device (machining path calculation device)
51 CPU
52 storage unit 53 RAM

Claims (7)

In a machining path calculation device that calculates a machining path for machining a workpiece based on a plurality of command points that indicate the position of the spindle,
A setting unit for setting an evaluation cross section that intersects the machining path;
An intersection calculation unit for calculating an intersection of the evaluation cross section set in the setting unit and the machining path;
A feature amount calculation unit that calculates a feature amount indicating the degree of unevenness in the first region of the workpiece surface after processing with respect to the intersection calculated by the intersection point calculation unit;
A first generation unit configured to generate first image data in the first region based on the feature amount calculated by the feature amount calculation unit;
When the designation of the second region located in the first region is received, the first amount is calculated based on the feature amount calculated by the feature amount calculation unit according to the feature amount indicating the degree of unevenness in the second region. A processing path calculation device comprising: a second generation unit configured to generate second image data in one region. The first generation unit sets a color corresponding to each feature amount in the first region based on the maximum value and the minimum value of the feature amount in the first region, and based on the set color, the first generation unit Generate image data,
The second generation unit sets a color corresponding to each feature amount in the first region based on the maximum value and the minimum value of the feature amount in the second region, and based on the set color, the second generation unit The processing path calculation device according to claim 2, wherein image data is generated. An intersection position correction unit for correcting the position of the intersection calculated by the intersection calculation unit;
A correction feature amount calculation unit that calculates a feature amount indicating the degree of unevenness in the first region of the workpiece surface after processing with respect to the intersection after correction by the intersection position correction unit;
A third generation unit that generates first corrected image data in the first region based on the feature amount calculated by the correction feature amount calculation unit;
When receiving the designation of the second region located in the first region, based on the feature amount calculated by the correction feature amount calculation unit according to the feature amount indicating the degree of unevenness in the second region, The processing path calculation device according to claim 1, further comprising: a fourth generation unit configured to generate second corrected image data in the first region. The third generation unit sets a color corresponding to each feature amount in the first region based on the maximum value and the minimum value of the feature amount in the first region, and based on the set color, the first generation unit Generate corrected image data,
The fourth generation unit sets a color corresponding to each feature amount in the first region based on the maximum value and the minimum value of the feature amount in the second region, and based on the set color, the second generation unit The processing path calculation device according to claim 3, wherein corrected image data is generated. Displaying an image based on the first image data and an image based on the first corrected image data side by side on a display unit;
The processing path calculation device according to claim 3 or 4, wherein an image based on the second image data and an image based on the second corrected image data are displayed side by side on a display unit. In a machining path calculation method for calculating a machining path for machining a workpiece based on a plurality of command points that indicate the position of the spindle,
Set an evaluation cross section that intersects the machining path,
Calculate the intersection of the set evaluation cross section and the machining path,
With respect to the calculated intersection, a feature amount indicating the degree of unevenness in the first region of the workpiece surface after processing is calculated,
Based on the calculated feature amount, first image data in the first region is generated,
When the designation of the second area located in the first area is received, the second image in the first area is calculated based on the calculated feature quantity according to the feature quantity indicating the degree of unevenness in the second area. A machining path calculation method characterized by generating data. In a computer program that can be executed by a machining path computing device that computes a machining path for machining a workpiece based on a plurality of command points that indicate the position of the spindle,
In the machining path calculation device,
Set an evaluation cross section that intersects the machining path,
Calculate the intersection of the set evaluation cross section and the machining path,
With respect to the calculated intersection, a feature amount indicating the degree of unevenness in the first region of the workpiece surface after processing is calculated,
Based on the calculated feature amount, first image data in the first region is generated,
When the designation of the second area located in the first area is received, the second image in the first area is calculated based on the calculated feature quantity according to the feature quantity indicating the degree of unevenness in the second area. A computer program for executing a process of generating data.

Images