TW201436967A - Device for processing outer circumference of workpiece - Google Patents

Abstract

The present invention relates to a device for processing an outer circumference of a workpiece, which is applied to a device for grinding and precise processing of an outer circumference of a glass plate, can carry out the most optimal outer circumference processing for a blank containing a notch or corrugation, and can reduce the cutting margin of the workpiece to achieve shortening of processing time and reduction of tool abrasion. The present invention can also perform blank quality examination. The present invention continuously photographs the whole circumference or a plurality of circumferential areas of a blank sent on a workbench in order to detect an inner edge of the outer circumference of the workpiece periphery according to the image and to correct a correction value that the operation unit calculates according to deviation (shift) between the outer circumference of the blank and a product to make the cutting margin consistent in the entirety of the circumference of the workpiece, to make the cutting margin least and, even when a defect of notch or corrugation is detect on the outer circumference of the blank, to cut off the defect so as to produce a product.

Description

Workpiece peripheral processing device

The present invention relates to a device suitable for finishing the outer periphery of a plate-shaped workpiece, and more particularly to a device suitable for peripheral processing of a glass substrate such as a glass substrate and a cover glass for a display panel.

The glass plate used in the display panel is cut into a blank shape (a shape in which a predetermined finishing allowance is added to the shape of the product) by water jet machining and sandblasting, and then finished into a product shape by a peripheral processing device. As shown in FIG. 5, the cut surface t of the outer periphery of the glass plate cut by the water jet processing and the sand blasting is inclined. The interval d between the outer edge e and the inner edge f of the inclined cutting surface is 0.1 mm to 0.2 mm. Further, a notch (chip) or a corrugation may be generated on the outer periphery of the blank thus cut. If the notch or the corrugation is larger than the finishing allowance (cutting allowance during machining) of the outer peripheral processing apparatus, it cannot be finished into a product shape and becomes a defective product.

The peripheral processing apparatus includes a table for fixing the workpiece and a tool for processing the outer circumference of the workpiece fixed to the table (generally a rotating grinding wheel), and continuously controlling the relative positional relationship between the table and the tool during processing. Processing. When the blank is fixed on the table at a position offset from the standard position, the finishing allowance becomes uneven, and for this reason, a defective product is produced. Therefore, the outer peripheral processing apparatus is provided with means for detecting the positional deviation of the blank fixed to the table and correcting the offset. For example, a camera that detects a positioning mark or a peripheral corner portion of the blank is provided, and based on the image, a positional shift of the blank fixed on the table is detected, by moving the blank to the correct position, or The relative positional relationship between the table and the tool in the process corrects the detected offset, thereby enabling the correct product shape to be machined even if the workpiece is placed at an offset position on the table. Japanese Laid-Open Patent Publication No. 2013-35089 (Patent Document 1).

As a camera that detects a positional shift of a workpiece on a table, a conventional CCTV (Closed Circuit Television) lens is conventionally used. In the conventional camera, the inner edge f of the blank shown in Fig. 5 cannot be clearly recognized, and therefore the outer edge e is used as a reference to detect the positional deviation of the workpiece. However, in the detection of only the positioning mark of the workpiece or the detection of only the outer edge e of the corner portion, it is impossible to detect the corrugation or the notch locally generated on the outer circumference of the blank, and the inner portion caused by the change in the inclination of the cutting surface t The size of the difference d between the edge f and the outer edge e cannot be detected.

Therefore, in order to prevent the occurrence of defective products due to insufficient finishing allowance due to the notch or corrugation of the outer circumference of the blank and the increase in the local inclination of the cut surface t, when cutting the blank by water jet machining and sandblasting, It is cut into a shape that gives a finishing allowance larger than the finishing allowance required for finishing.

A peripheral processing apparatus that performs peripheral processing by grinding is conventionally processed in the same manner as a general machining center provided with a feed table fed in two directions (xy direction) perpendicular to the tool, and according to The machined peripheral shape moves the tool in a two-dimensional plane. In this regard, the applicant of the present invention proposes a peripheral processing apparatus in which the rotation angle θ of the table around the vertical axis is controlled in association with the movement of the tool in the radius r direction and away from the center of the table, thereby performing arbitrary The outer peripheral processing of the shape (hereinafter referred to as "polar coordinate method") is shown in JP-A-2010-188443 (Patent Document 2) and JP-A-2011-116118 (Patent Document 3). The polar-circumferential peripheral processing apparatus has a feature that the installation area of the apparatus can be significantly reduced as compared with the conventional machining center-type peripheral processing apparatus.

If the finishing allowance is increased, the machining time of the workpiece in the peripheral processing device is of course increased. Further, if the finishing allowance is large, the tool wear also becomes large. Therefore, the smaller the finishing allowance, the smaller the processing time and the processing cost. Further, since the defective workpiece is inspected for the workpiece subjected to the outer peripheral processing, even if the defective blank having the notch or the corrugation which cannot be removed during the finishing is fed into the outer peripheral processing apparatus, they cannot be found before the finishing. Therefore, the defective blank is excluded as a defective product after finishing, and the defective blank is also finished in vain.

In order to solve the deficiencies and limitations of the conventional workpiece peripheral processing apparatus, the main object of the present invention is to provide a peripheral processing apparatus for a workpiece, which can also perform optimal peripheral processing for blanks having notches or corrugations on the outer circumference. When the notch or the corrugation is removed, the blank can be removed before the finishing, and the cutting allowance of the workpiece in the peripheral processing can be reduced to achieve a reduction in the processing time and a reduction in the tool wear, and the quality inspection of the blank can be performed.

The present invention solves the peripheral processing apparatus for a workpiece proposed by the prior art, comprising: a table that holds a plate-shaped workpiece horizontally and rotates about a vertical axis; a tool that processes the outer circumference of the workpiece; a motor that controls the position of the tool based on a command value of the controller; a camera that captures an image of a peripheral portion of the workpiece; and an image acquisition unit that feeds the workpiece onto the table before processing Performing the peripheral movement of the workpiece by the camera while performing the peripheral movement of the workpiece at a standard position and phase setting on the table, the camera is used to capture the outer circumference of the workpiece before machining; the deviation detecting unit is obtained for the camera Each image detects a deviation between a position of the outer circumference of the workpiece and a position of the outer circumference of the workpiece that has been previously set in the controller; a correction value calculation unit that calculates the deviation from the deviation detected by the deviation detecting unit Correction value and tool for the spindle rotation angle required for the workpiece to be machined A correction value for the amount of supply; and a correction command unit that corrects the command value applied to the feed motor based on the calculated correction value.

In the peripheral processing device for a workpiece, the deviation detecting unit detects the deviation by using a detection line located inside the workpiece among two substantially parallel detection lines of an image acquired by the camera as an outer circumference of the workpiece.

In the peripheral processing device for a workpiece, the correction value calculation unit calculates the correction value in such a manner that the cutting allowance of the outer peripheral processing device becomes uniform over the entire circumference of the workpiece based on the deviation of the outer circumference of the blank detected by the deviation detecting unit. .

In the peripheral processing device for a workpiece, the correction value calculation unit calculates the correction amount of the outer peripheral region of a part of the workpiece as a cutting allowance that can be processed by one pass of the tool. Value: After the outer peripheral region other than the outer peripheral region of the portion is processed in advance, the entire circumference is processed by one pass.

In the peripheral processing device for the workpiece, when the defect on the outer circumference of the blank is detected, the correction value calculation unit calculates the correction value so that the defect can be cut to machine the product.

The peripheral processing device of the workpiece of the present invention is such that the camera continuously or intermittently captures the entire circumference of the workpiece or the determined plurality of outer peripheral regions (for example, for the rectangular workpiece, the corner portion and the central portion of the four sides, for the elliptical workpiece The outer peripheral region of the both ends of the long diameter and the both ends of the short diameter) detects the deviation (positional shift) Δr of the outer periphery of the blank in the entire circumference or the plurality of outer peripheral regions based on the acquired image, based on the detected whole circumference or a plurality of outer circumferences In the deviation of the area, a correction value for performing an optimum machining operation for processing from the blank into a product is calculated for each blank, and a feed command of the tool is corrected based on the calculation result.

The image origin o of the camera of the present invention is the position of the outer periphery of the article on the image of the correct shape of the article set at the standard position on the table. By using a high-resolution camera with a telecentric lens, the inner edge and the outer edge of the outer circumference of the workpiece can be detected as different detection lines from the image of the camera.

The correction value calculation means of the present invention calculates the correction value so that the cutting allowance of the outer peripheral machining device becomes uniform over the entire circumference of the workpiece based on the deviation of the outer circumference of the blank detected by the deviation detecting means. When the machining allowance that becomes uniform is larger than the cutting allowance of the tool for one pass (the tool can be cut by one cutting), the cutting allowance of the outer peripheral portion of the workpiece can be made to pass once. The correction value is calculated in such a manner that the machining allowance can be processed. In this case, after the outer peripheral region which cannot be machined by one pass is processed in advance, the entire circumference is processed by one pass. When a defect such as a notch or a corrugation is detected on the outer periphery of the blank, the correction value is calculated so that the product can be cut by cutting the defect. When the notch or corrugation cannot be cut even if the correction is made, the blank is discarded without processing.

The enhancements achievable by the technical means of the present invention include: 1. The present invention is capable of finishing an optimum correction and tool path such that the cutting allowance is uniform over the entire circumference of the blank fed to the table, and Since the blank can be cut with a smaller finishing allowance than the cutting in the previous step, the processing time in the outer peripheral processing apparatus can be shortened, and the tool life can be extended. 2. The present invention can prevent the detection error of the finishing allowance due to the inclination of the cut surface of the blank by detecting the inner edge of the blank, and can be used for the presence of a notch, a corrugation, a burr or the like on the outer circumference of the blank. These are cut off to obtain a correction of the product, so that a blank which is a defective product in the conventional apparatus can be processed into a product. 3. According to the present invention, it is also possible to perform quality inspection of the blank (inspection of the processing quality in the preceding process) based on the interval or notch of the inner edge and the outer edge of the detected blank, and the interval between the inner edge and the outer edge due to the detection. When the product cannot be obtained because the threshold value is exceeded or the correction value such as the cut of the notch is not calculated, the defective blank can be removed before the processing, and the defective product can be prevented from being processed in vain.

In order to understand the technical features and practical effects of the present invention in detail, and in accordance with the present invention, further details are shown in the preferred embodiments as illustrated in the following:

Fig. 1 is a schematic side view of a peripheral processing apparatus which is processed in a polar coordinate manner. In the figure, the main shaft 1 is a hollow shaft in the vertical direction, and is rotatably supported by a frame (not shown) via a bearing 11. A table 12 is fixed to the upper end of the main shaft 1, and the blank (workpiece) w is measured and processed in a state of being fixed to the horizontal upper surface 13 of the table 12. The negative pressure is supplied to the table 12 through the hollow hole of the main shaft 1, and the surface of the blank w fed to the upper surface 13 of the table 12 is fixed to the table 12 by vacuum suction. A spindle motor (servo motor) 15 is coupled to the lower end of the main shaft 1. The spindle motor 15 is connected to the controller 4 via the servo amplifier 41, and controls the rotation angle of the spindle 1 in accordance with an instruction from the controller 4.

A transverse feed table 21 is provided above the main shaft 1. The lateral feed table 21 is guided by a lateral guide (not shown) provided in the horizontal direction of the frame to be freely movable, and is fed in a lateral direction driven by a lateral feed motor (servo motor) 23 The screw 24 is screwed. The transverse feed motor 23 is connected to the controller 4 via a servo amplifier 42, and the moving position of the lateral feed table 21 is controlled by the controller 4.

A longitudinal feed table 25 is provided on the infeed table 21. The longitudinal feed table 25 is mounted in a vertical direction (ie, a direction parallel to the main shaft 1) in a freely movable manner (not shown), the longitudinal guide is fixed to the lateral feed table 21, and longitudinally The feed table 25 is screwed with a longitudinal feed screw 27 that is rotated by the longitudinal feed motor 26. Further, a camera 5 is attached to the infeed table 21, and the camera 5 obtains an image of the outer peripheral portion of the blank w before processing which is fed onto the table 12.

On the longitudinal feed table 25, the tool shaft 31 is axially supported by the bearing 32 in the vertical direction so as to be parallel to the main shaft 1. A tool (generally a grinding wheel) 3 is attached to the lower end of the tool shaft 31. The upper end of the tool shaft 31 is coupled to the tool drive motor 34 via a timing belt 33.

The axis P of the main shaft 1, the axis Q of the tool 3, and the optical axis center a of the camera 5 are located on the same plane S parallel to the moving direction of the infeed stage 21 and including the axis P of the main shaft. 2 is a view schematically showing the outer peripheral processing of the blank w by the polar coordinate method, by correlating the movement amount r of the lateral feed table 21 with the rotation angle θ of the main shaft 1 by the controller 4 shown in FIG. Control is performed to perform peripheral processing of a desired planar shape. Further, although not shown in the drawings, in the apparatus for performing the through hole or the inner diameter processing on the workpiece, the vertical feed table 25 is provided with a grinding wheel having a small diameter which can be relatively raised and lowered with respect to the tool 3 to perform the penetration. Processing of a hole or an inner diameter (refer to Patent Document 3).

The camera 5 is provided with a camera having the resolution required for the acquired image, and it is preferable to use a camera having a telecentric lens. The optical axis center a of the camera 5 is parallel to the axis P of the main shaft 1. Therefore, the camera 5 obtains an image of the outer peripheral portion of the processed blank (workpiece) w as viewed from the direction perpendicular to the surface.

The message of the image taken by the camera 5 is sent to the controller 4. The controller 4 includes an image acquisition unit 43, a deviation detecting unit 44, a correction value arithmetic unit 45, and a correction command unit 46. The image acquisition unit 43 moves the image origin o of the camera 5 along the outer circumference c of the product of the correct shape (hereinafter referred to as "standard product") set on the table 12 in the correct posture (position and direction). The image captured continuously or intermittently is sent to the deviation detecting unit 44. When the notch or corrugation of the outer circumference of the blank is detected, the interval at which the image is taken must be an interval shorter than the size of the detected notch or the period of the corrugation.

The deviation detecting unit 44 detects the inner detection line n corresponding to the inner edge f of the outer circumference of the workpiece for each image 51 transmitted from the image detecting unit 43 (refer to FIG. 4), and detects the r-axis. The deviation Δr from the origin o of the image. The correction value calculation unit 45 calculates the feed error and the blank w for correcting the blank w placed on the table 12 based on the deviation Δr obtained in the entire circumference of the workpiece or the plurality of outer peripheral regions or their average (smooth) value ΔR. The correction value of the shape error (the shape error of the blank caused by the distribution of the cutting allowance or the gap). The correction command unit 46 corrects the origin phase of the table rotation by the correction value Δθ of the angle obtained by the correction value calculation unit 45, and corrects the command value applied to the infeed motor 23 based on the position correction value.

The correction value calculation unit 45 calculates a correction value so that the cutting allowance on the outer circumference of the blank is uniform and the distribution of the cutting allowance becomes a distribution suitable for shortening the processing time. When it is determined that the outer circumference (inner edge) of the blank w has a defect such as a notch or a corrugation, the correction value calculation unit 45 calculates a correction value for performing processing of the product by removing the defects.

The controller 4 can be provided with a blank quality inspection unit. The blank quality inspection unit statistically calculates the size and distribution of the finishing amount set for the blank for each batch of the processed blank, and the deviation of them in the entire batch, thereby determining the quality of each batch of the blank. When this determination is made, the deviation detecting unit 44 detects the interval between the detection lines n and m on the inner side and the outer side of the image.

The product shape (shape of the standard product) of the workpiece processed by the peripheral processing device is registered in the controller, and the controller 4 can calculate the angle θ of the origin phase of the standard product from the spindle and the workpiece center U at the angle The relationship between the radius Ro to the outer circumference and the angle φ of the distance normal in the r direction on the outer circumference. On the other hand, for example, when the workpiece is a glass substrate used in a display of a portable terminal, the blank (work before processing) is usually cut into a shape of the product by a pre-process such as water jet machining or sandblasting. The shape of the specified finishing allowance g. However, the shape of the blank has a shape error caused by the deviation of the cutting size allowed in the previous process. There are even gaps (chips) or corrugations (claws) that are generated during the processing of the previous process. These become variations or errors in the cutting allowance of the peripheral processing device. Further, the cut surface t of the blank is inclined as shown in Fig. 5, and the ridge line between the cut surface t and the glass surface, that is, the inner edge f is located inside the outer edge e, and the outer periphery of the product must be located inside the inner edge f.

Next, the machining operation of the workpiece in the outer peripheral machining device configured as described above will be described. The blank is fed to the table 12 by a feeding device (not shown) and held by means of a negative pressure. In a state where the origin phase of the billet is made uniform and the center U of the billet is aligned with the spindle axis, the billet w is fed to the stage 12 (the angle around the spindle axis) on the stage 12 of the origin phase, but The blank fed into and fixed to the table 12 has a positioning error generated at the time of feeding.

The controller 4 determines in such a manner that the origin o of the image 51 of the camera 5 is located at the intersection of the outer circumference c of the standard product W and the r direction (the feed direction of the feed stage 21 through the table axis P). The position of the feed table 21 is transversely moved, and from this state, the spindle 1 is rotated one turn (as shown in Fig. 3). The controller 4 moves the infeed stage 21 in such a manner that the image origin o of the camera tracks the outer circumference c of the standard article during the one rotation. During this rotation, the image acquisition unit 43 acquires the image 51 of the camera continuously or intermittently, and transmits it to the deviation detecting unit 44 of the controller 4. Further, the image origin o may be set to the optical axis center a of the camera, but since the blank has a finishing allowance, the detected line n of the photographed workpiece is mostly outside the optical axis in most cases ( The opposite side of the workpiece, hereinafter referred to as the "positive side", is reasonable in setting the origin o on the negative side of the optical axis.

The deviation detecting unit 44 of the controller detects the detection line n inside the two detection lines m and n which are substantially parallel to the outer circumference of the workpiece for each of the transmitted images, and detects the detection line n and the r axis. The intersection of the intersection point Δr from the origin o of the image is stored together with the rotation angle θ of the main axis at the time of capturing the image. When the offset of the angle or position of the blank on the table 12 is large, Δr is locally negative.

The value of Δr detected has a small deviation due to a notch or a corrugation around the billet, and therefore, in order to obtain a relationship between the rotation angle θ and the distance Δr which average them, a predetermined one centered on each angle θ is used. The average value of Δr in the circumferential length or the angular range is taken as ΔR, and the relationship with the rotation angle θ is obtained.

The shape of the article to be processed is not limited to a rectangle, and is generally a shape of a rounded rectangle, a barrel, an ellipse, an oval, or the like. The correction value calculation unit 45 calculates a feed error (angle error and position error) of the blank on the table based on ΔR of each rotation angle θ. For example, θ and R (R=Ro+ΔR) are calculated by adding ΔR of the rotation angle θ to the radius Ro of the standard article of the angle (the distance of the angle from the table axis P to the image origin o). Relationship. When the shape of the product is a shape having a straight portion such as a rectangle, the inclination of the line corresponding to the straight portion in the θ-R graph (the average value of the inclination of the four lines in the case of a rectangle) can be used to determine the billet relative to the work. The inclination of the origin phase (correction of the angle) Δθ. In the case of an oval or the like, the angle between the angle of a special point in the θ-R chart (for example, a point showing that R is the maximum value or the minimum value) and the angle of the point of the standard article corresponding to the special point can be The difference is found as Δθ.

When Δθ is obtained, the difference between the ΔR of the spindle angle θ = 0 degrees corrected by the Δθ and the ΔR of 180 degrees, and the difference of ΔR between θ=90 degrees and 270 degrees can calculate the distance to the center U of the blank. The deviation θX and ΔY in the X direction and the Y direction after the correction of the θ of the table axis P is performed. In addition, the X and Y directions are the directions on the workpiece, and the X direction when the workpiece is at the origin phase is the r direction.

The measured value Δr of each angle θ is corrected by the correction values ΔX and ΔY, and the relationship between θ and the cutting allowance g can be obtained by multiplying the correction value by cosφ. If the shape of the blank is normal, for example, as shown in FIG. The amount g is distributed over a substantially uniform value over the entire area of θ.

As for the cutting allowance g, as shown in Fig. 8, if the cutting allowance g is a negative portion at a certain angle 则, it is judged that it is caused by a partial notch or a corrugation. Therefore, the amount of movement in the X and Y directions required for the cutting allowance g to be a positive value is calculated from the value of the angle ψ, and the correction values ΔX and ΔY of the blank center U are calculated again (for example, if it is a rectangular workpiece, The associated side moves in a vertical direction with a negative amount. If it is an elliptical workpiece, it moves a negative amount in the direction of the angle ψ.) Then, if the corrected cutting allowance g with the new correction value appears on the positive side of the workpiece, By processing based on the corrected workpiece center, it is possible to process a product without defects. On the other hand, if the cutting allowance g is negative after the correction again, the product cannot be processed from the blank, and therefore the blank is discarded without processing and fed to the next blank.

Since the correction value Δθ of the spindle angle and the correction values ΔX and ΔY of the position are obtained in this way, the correction command unit 46 sets these correction values to start the machining of the workpiece. The correction command unit 46 first corrects the spindle origin by using the correction value Δθ of the spindle angle, and calculates a correction value of the tool feed amount that changes in accordance with the rotation angle of the corrected spindle to correct the feed of the feed table 21 . The command thereby grinds the outer circumference of the workpiece with respect to the center of the workpiece (the center of the workpiece obtained from the outer circumference) with a small circular trajectory drawn along the rotation of the table 12 .

As understood from the above, the correction value of the machining operation of the outer peripheral machining apparatus of the present invention can be calculated using a detection value meter showing the outer circumference of the workpiece at an angle of a special point or an extreme value estimated from the machining shape of the workpiece. Therefore, if it is a blank which is known to have no defects such as a notch or a blank which only has a defect at a specific portion, it is not necessary to obtain an image of the entire circumference of the blank by the camera, and it is possible to obtain an image only in a plurality of peripheral regions required. Correction of the machining operation.

When a part of the outer circumference of the blank has a defect such as a notch or a corrugation, when the product can be processed while avoiding the defect, the cutting allowance of the workpiece is increased centering on the portion where the defect is located. When the increased cutting allowance cannot be cut by one pass (tool pass), multiple passes are required, but the cutting allowance is small on the opposite side of the workpiece, so multiple passes are not required. Therefore, it is possible to shorten the machining time by cutting only the area where the cutter has to be performed multiple times in advance and performing the final finishing by the entire circumference of the pass.

Even when there is no defect such as a notch, when the cutting allowance is large over the entire circumference of the workpiece, the correction of the center of the workpiece is appropriately shifted to deliberately make the cutting allowance uneven, and the cutting allowance is increased by using multiple passes. The part is machined and finally processed in one pass with a single pass, which also reduces the overall machining time. Further, when there is no defect, it is possible to perform a process in which the cutting allowance on the outer circumference of the workpiece is substantially uniform. Therefore, by cutting the blank with an appropriate finishing allowance, the workpiece can be processed in a single pass with a single pass.

The calculation result of the correction value arithmetic unit 45 shows the magnitude of the finishing allowance of the blank and the deviation thereof. In addition, if a portion having g is negative in a part, this means that there is a notch or corrugation which affects the finishing. Therefore, by knowing the quality of each of the blanks and summarizing the data, it is possible to inspect the quality of each batch of the blanks, and thus it is possible to find problems in the processing of the preceding steps or to achieve an improvement in the quality of the processing.

The above is only a preferred embodiment of the present invention, and is not intended to limit the scope of the present invention. Any one of ordinary skill in the art can use the present invention without departing from the scope of the present invention. Equivalent embodiments of the local modifications or modifications made by the disclosed technology are still within the scope of the technical solutions of the present invention.

1. . . Spindle

11. . . Bearing

12. . . Workbench

13. . . Upper surface

15. . . Spindle motor

twenty one. . . Transverse feed table

twenty three. . . Lateral feed motor

twenty four. . . Transverse feed screw

25. . . Longitudinal feed table

26. . . Longitudinal feed motor

27. . . Longitudinal feed screw

3. . . tool

31. . . Tool shaft

32. . . Bearing

33. . . Timing belt

34. . . Tool drive motor

4. . . Controller

41. . . Servo amplifier

42. . . Servo amplifier

43. . . Image acquisition unit

44. . . Deviation detection unit

45. . . Correction value unit

46. . . Correction command unit

5. . . camera

51. . . image

a. . . Optical axis center

c. . . Peripheral

d. . . interval

e. . . Outer edge

f. . . Inner edge

g. . . Cutting allowance

m. . . Test line

n. . . Test line

o. . . Image origin

P. . . Axis

Q. . . Axis

Ro. . . radius

r. . . Movement amount

S. . . flat

U. . . Workpiece center

W. . . product

w. . . Blank (workpiece before machining)

△R. . . average value

△r. . . Deviation (offset) distance

△X. . . deviation

△Y. . . deviation

θ. . . Rotation angle

△θ. . . Correction value

Φ. . . angle

BRIEF DESCRIPTION OF THE DRAWINGS Figure 1 is a side elevational view of a preferred embodiment of the present invention. Fig. 2 is an explanatory view showing the processing of the polar coordinate method. 3 is a top plan view showing the positional relationship of the main apparatus of the preferred embodiment of FIG. 1. 4 is a view showing a positional relationship between an image taken by a camera and a center of a table and a center of a workpiece. Fig. 5 is a cross-sectional view showing the inclination of the cut surface of the blank exaggeratedly. FIG. 6 is a graph showing an example of the distribution of the deviation Δr of the outer circumference of the workpiece detected by the camera. FIG. 7 is a graph showing an example of the distribution of the corrected cutting allowance g which makes the cutting allowance uniform. FIG. 8 is a graph showing an example of the distribution of the cutting allowance g after the correction of the workpiece having a defect on the outer circumference.

1. . . Spindle

11. . . Bearing

12. . . Workbench

13. . . Upper surface

15. . . Spindle motor

twenty one. . . Transverse feed table

twenty three. . . Lateral feed motor

twenty four. . . Transverse feed screw

25. . . Longitudinal feed table

26. . . Longitudinal feed motor

27. . . Longitudinal feed screw

3. . . tool

31. . . Tool shaft

32. . . Bearing

33. . . Timing belt

34. . . Tool drive motor

4. . . Controller

41. . . Servo amplifier

42. . . Servo amplifier

43. . . Image acquisition unit

44. . . Deviation detection unit

45. . . Correction value unit

46. . . Correction command unit

5. . . camera

a. . . Optical axis center

P. . . Axis

Q. . . Axis

w. . . Blank (workpiece before machining)

Claims (5)

A peripheral processing apparatus for a workpiece, comprising: a table that holds a plate-like workpiece horizontally and rotates about a vertical axis; a tool that processes an outer circumference of the workpiece; a transverse feed motor that is controller-based a command value controls a position of the tool; a camera that captures an image of a peripheral portion of the workpiece; and an image acquisition unit that causes the camera to follow while the workpiece is fed onto the table before machining The workbench is finished with the standard position and phase setting to complete the peripheral movement of the workpiece, and the outer circumference of the workpiece before the machining is taken by the camera; the deviation detecting unit detects the outer circumference of the workpiece for each image acquired by the camera. a deviation between the position and a position of the outer circumference of the workpiece that is previously set in the controller; a correction value calculation unit that calculates a required product to be processed from the workpiece to be fed based on the deviation detected by the deviation detecting unit The correction value of the spindle rotation angle and the correction value of the tool feed amount; Instruction unit, based on the calculated correction command value applied to the feed motor, the correction value. The peripheral processing device for a workpiece according to claim 1, wherein the deviation detecting unit detects a detection line located inside the workpiece from the substantially parallel two detection lines of the image acquired by the camera as the outer circumference of the workpiece. Deviation. The peripheral processing device for a workpiece according to claim 1 or 2, wherein the correction value computing unit changes the outer circumference of the blank detected by the deviation detecting unit so that the cutting allowance of the outer peripheral processing device becomes the entire circumference of the workpiece. The correction value is calculated in a uniform manner. The peripheral processing device for a workpiece according to claim 1 or 2, wherein the correction value computing unit is capable of cutting a cutting allowance of a peripheral portion of a part of the workpiece by a single pass of the tool The correction value is calculated by the remaining amount; after the outer peripheral region other than the outer peripheral region of the portion is processed in advance, the entire circumference is processed by one pass. The outer peripheral processing device for a workpiece according to claim 1 or 2, wherein when the defect of the outer periphery of the blank is detected, the correction value calculation unit calculates the correction value so that the product can be cut by cutting the defect.