JP2005001028A - Curved surface machining method for cutting workpiece into optional curved surface - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a curved surface machining method for shortening the stroke of a slider provided with a cutting tool operated by a linear motor, to allow high speed and high acceleration of the slider. <P>SOLUTION: In this curved surface machining method, the rotation of a spindle 14 holding a workpiece 9, and the motion of Z-axis table 3, the slider 12 and an X-axis table 4 are synchronized with each other, and the Z-axis direction motion of the spindle 14 holding the workpiece 9, the Y-axis direction motion of the slider 12 provided with the cutting tool and moved by the linear motor 18, and the X-axis direction motion of the X-axis table 4, are synchronized with the predetermined prescribed rotating speed of the spindle 14 to cut a facing surface 31 of the workpiece 9 orthogonal to the Y-axis moving direction of the cutting tool 15, rapidly with high accuracy into a predetermined prescribed curved surface by the cutting tool 15. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a curved surface processing method for a workpiece, which uses an NC processing machine to cut a workpiece such as a resin lens into a predetermined curved surface such as a toric shape (annular surface shape).
[0002]
[Prior art]
Various types of optical lenses are incorporated in optical devices and information equipment devices. An optical lens generally has an axisymmetric aspheric surface, and is manufactured by molding or processing a glass surface and polishing it with a polishing apparatus as a finish. Various polishing apparatuses for producing an axisymmetric aspherical surface have been developed. Such a polishing device is a device for improving the surface roughness, and has the advantage of being suitable for finishing, but the rotational speed of the workpiece is slow, the polishing speed is slow, and the shape of the workpiece is created. It is impossible.
[0003]
2. Description of the Related Art Conventionally, there is known a machining method for machining a non-axisymmetric aspheric surface in a short time and with high accuracy on a workpiece by using a NC machine tool. In the machining method, the Z-axis table on which the headstock is mounted is fixed so as not to move during machining, a workpiece is attached to the chuck of the spindle, and the workpiece is rotated around the spindle by a spindle motor. On the other hand, the slide holding the bite reciprocates in the Z-axis direction by the NC controller, and the X-axis table on which the slide is placed reciprocates in the X-axis direction. The reciprocation of the slide and the X-axis table is performed in synchronization with the rotation of the workpiece, and the slide and the X-axis table are reciprocated in synchronization with each other (see, for example, Patent Document 1).
[0004]
In addition, an NC processing machine is known in which a slider that reciprocates in the Y-axis direction is driven by a linear motor. This NC processing machine reciprocates the slider provided on the turner base in the Z-axis direction with a linear motor to enable cutting corresponding to high speed and high acceleration, and in the X-axis direction fixed to the turner base. Slide block with track rails extending in the orthogonal Z-axis direction, slider with a tool that reciprocates at high speed and high speed along the track rail with respect to the slide block, and slider reciprocating along the track rail of the linear guide It has a drive device to be moved. The driving device is composed of a linear motor coil fixed to a slide block and a linear motor magnet plate incorporated in the slider, and is provided with a linear scale and a linear scale detector for detecting the amount of movement of the slider (for example, a patent) Reference 2).
[0005]
Also, foreseeing learning control devices in learning control devices are known for controlling NC machines. The foreseeing learning control apparatus has m inputs and p outputs, and the output vector of the control target represented by the state space expression is made to follow a target command vector that repeats the same pattern with a period L. A learning control device that inputs a target command vector, an output vector and a state vector of a controlled object at a time, and outputs the control input vector to the controlled object, means for obtaining a deviation vector from the target command vector and the output vector, learning control constants Means for storing a matrix and means for determining a control input vector at the current time so that a predetermined evaluation function is minimized (see, for example, Patent Document 3).
[0006]
[Patent Document 1]
Japanese Patent Laid-Open No. 11-309602 (pages 1, 2 and 1)
[Patent Document 2]
Japanese Patent Laid-Open No. 2002-126907 (pages 1, 2 and 4)
[Patent Document 3]
Japanese Patent Laid-Open No. 7-14004 (Pages 1, 2 and 1)
[0007]
[Problems to be solved by the invention]
However, since there is a problem that the machining method requires a long time for the machining method of the workpiece, it has been required to process the workpiece into an aspherical curved surface in a short time. Therefore, as described above, it has been developed to cut the end face of a workpiece into an axisymmetric aspheric surface in a short time using an NC machine, but this machining method is performed in the Z-axis direction for reciprocating the spindle. The rotary servomotor is a drive device that reciprocates the X-axis table in the X-axis direction and a drive device that reciprocates the turner in the Y-axis direction. Therefore, there was a problem of whether the machining time of the workpiece could be further shortened.
[0008]
[Means for Solving the Problems]
SUMMARY OF THE INVENTION An object of the present invention is to solve the above-mentioned problem, using an NC processing machine of a type in which a reciprocating slider with a tool fixed is reciprocated in the Y-axis direction using a linear motor drive device, and a workpiece. In synchronization with the rotation, the main shaft is moved in the Z-axis direction, the X-axis table with the turner base is moved in the X-axis direction, and the slider with the bite is moved in the Y-axis direction. Cutting a workpiece such as a resin lens into a curved surface shape such as a concave lens surface, a convex lens surface, a toric lens surface, a progressive multifocal lens surface, etc., and moving the main shaft in the Z-axis direction in the Y-axis direction of the tool The amount of movement is shortened, which makes the slider smaller and enables high-speed, high-acceleration reciprocating motion with low inertial force. Curved machining method of the workpiece that a predetermined curved surface determined cutting with high accuracy in a short time at a high speed and high acceleration is to provide.
[0009]
The present invention includes a main shaft for holding a workpiece rotatably supported by a main shaft, a Z-axis table capable of reciprocating the main shaft in the Z-axis direction, a position opposed to the main shaft, and the Z-axis direction. X-axis table capable of reciprocating in the X-axis direction perpendicular to the X-axis, a turner base attached to the X-axis table, and a slider for reciprocating in the Y-axis direction parallel to the Z-axis direction on the turner base and attaching a cutting tool And a machining method for cutting the workpiece using an NC processing machine having a drive device for reciprocating the slider in the Y-axis direction, wherein the drive device for reciprocating the slider comprises a linear motor, The main shaft holding the workpiece is rotated at a predetermined rotation speed, the main shaft moves in the Z-axis direction, and the front of the slider to which the cutting tool is fixed. The movement in the Y-axis direction and the movement of the X-axis table in the X-axis direction are synchronized with each other, and the facing surface of the workpiece perpendicular to the movement direction of the cutting tool in the Y-axis direction is predetermined by the cutting tool. The present invention also relates to a curved surface processing method for a workpiece, characterized by cutting into a predetermined curved surface.
[0010]
The linear motor is composed of a field magnet incorporated in one of the slider and the turner base and an armature coil incorporated in the other. The turner base incorporating the linear motor is equipped with a linear scale for detecting the position of the slider.
[0011]
In this curved surface machining method, when the workpiece is cut into the predetermined curved surface, the stroke of the reciprocating movement in the Y-axis direction of the slider to which the cutting tool is fixed is the same as that of the main shaft holding the workpiece. It is set to a value obtained by subtracting the stroke of the movement in the Z-axis direction.
[0012]
In the curved surface machining method, when the predetermined curved surface to be machined into the workpiece has a toric shape consisting of a base R shape radius value and a cross R shape radius value orthogonal to the base, the workpiece is processed. The movement of the held spindle in the Z-axis direction is set to a movement amount corresponding to the R-shaped radius value of the base, and the movement of the slider with the cutting tool fixed in the Y-axis direction is the R-shape of the cross It is set to the difference between the movement amount corresponding to the radius value and the movement amount corresponding to the R-shaped radius value of the base. Alternatively, if the shape approximates the toric shape, the movement of the spindle holding the workpiece in the Z-axis direction is set to a movement amount corresponding to the R-shaped radius value of the base, and the tool is fixed. The movement of the slider in the Y-axis direction is set to the difference between the movement amount corresponding to the R-shaped radius value of the cross and the movement amount corresponding to the R-shaped radius value of the base.
[0013]
The cutting of the predetermined curved surface for the workpiece is achieved by predictive learning control that takes into account repeated commands in order to bring the actual processing amount for the workpiece close to a predetermined predetermined processing command value.
[0014]
The workpiece cut into the predetermined curved surface by the cutting tool is a lens for eyeglasses. The curved surface processing method is set such that the slider reciprocates N times for one rotation of the main shaft. For example, if the predetermined curved surface to be machined on the workpiece is a toric lens surface, it reciprocates twice, and if it is a progressive multifocal lens surface, the number of reciprocations cannot be specified. Is set to reciprocate a plurality of times, that is, N times.
[0015]
Since this curved surface processing method is configured as described above, when cutting a facing surface of a workpiece such as a lens surface of a resin lens into a toric shape, a direction perpendicular to the lens surface (Z-axis direction and The Y-axis stroke (in the Y-axis direction) is required for the curved surface shape to be cut into the workpiece, but when moving the slider with the cutting tool in the Y-axis direction and moving the main shaft in synchronization with the Z-axis direction, If the shape of the workpiece to be cut is a toric curved surface, and the base R-shaped radius value RL is larger than the R-shaped radius value RS of the cross perpendicular thereto, the Y-axis movement slider is It is only necessary to move by the difference (RB−RC) between the movement amount RB corresponding to the shape radius value RL and the movement amount RC corresponding to the cross R shape radius value RS. It can be made shorter design than with a fixed. At this time, if the drive device that moves the slider in the Y-axis direction is configured with a linear motor, the linear motor itself can be designed to be smaller by the amount of the slider stroke, and the movable slider can be made smaller. The mass of can also be designed small. For linear motors, the acceleration of the movable object is determined by the mass and output of the movable object. Therefore, making the movable object, i.e., the slider as light as possible, can increase the acceleration, and it is advantageous to improve the responsiveness of the slider movement. It is.
[0016]
Since this curved surface processing method needs to be controlled so that the difference between the control command and the actual movement amount becomes zero as much as possible, a learning control device or a predictive learning control device that uses the repeatability of the control command is used. It is preferable to control. In this curved surface machining method, the error amount of the final curved surface machining shape changes depending on how good the control command is repeatability. Therefore, in this curved surface processing method, in synchronization with the rotation of the main shaft, the tool is moved in the Y-axis direction while moving the main shaft in the Z-axis direction, and the turner base is moved in the X-axis direction to move a workpiece such as a lens surface. By cutting the facing surface of the workpiece into a toric shape, the repeatability of the control command is improved while drawing a spiral machining locus on the facing surface of the workpiece, and the amount of error between the control command and the actual machining amount is improved. Is constant, and the workpiece can be curved with higher accuracy and speed.
[0017]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of a curved surface machining method for a workpiece according to the present invention will be described below with reference to the drawings. With reference to FIGS. 1-4, the NC processing machine used when implementing the curved surface processing method by this invention is demonstrated.
[0018]
An NC machine 1 for achieving the curved surface machining method of a workpiece according to the present invention is a Z-axis that can reciprocate in the Z-axis direction, which is the longitudinal direction of the main shaft 14, on a Z-axis base 46 provided on the machine base 2. The shaft table 3 and the X-axis table 4 that can reciprocate in the X-axis direction orthogonal to the Z-axis direction on the X-axis base 47 provided on the processing machine base 2 are provided. A spindle stock 5 is installed on the Z-axis table 3. The Z-axis table 3 is driven by a servo motor 6 attached to the Z-axis base 46 and reciprocates in the Z-axis direction. A spindle motor 7 that rotates the spindle 14 is incorporated in the spindle stock 5. A chuck 8 is provided at the tip of the main shaft 14, and a workpiece 9 is held on the chuck 8. The X-axis table 4 that can reciprocate in the X-axis direction orthogonal to the Z-axis direction of the Z-axis table 3 is disposed at a position facing the workpiece 9 attached to the chuck 8 of the main shaft 14. A turner 11 is fixed to the X-axis table 4 directly or via a tool post table, and a tool post 43 for mounting various tools 44 facing the workpiece 9 of the main spindle 14 is installed. .
[0019]
The curved surface machining method according to the present invention is generally arranged at a position facing the work table 9 held by the main shaft 14, the Z-axis table 3 for reciprocating the main shaft 14 in the Z-axis direction, the main shaft base 5 for rotating and supporting the main shaft 14. The X-axis table 4 is configured to be reciprocally movable in the X-axis direction orthogonal to the Z-axis direction, and the turner base 16 constituting the turner 11 installed in the X-axis table 4 is parallel to the Z-axis direction on the turner base 16. This is achieved by using an NC processing machine 1 having a slider 12 that reciprocates in the Y-axis direction and has a cutting tool 15 fixed at one end, and a linear motor 18 that is a drive device that reciprocates the slider 12 in the Y-axis direction. .
[0020]
This curved surface machining method is a method in which the rotation of the spindle 14 and the movements of the Z-axis table 3, the slider 12 and the X-axis table 4 are synchronized with each other, and the spindle 14 holding the workpiece 9 is predetermined. The movement of the spindle 14 in the Z-axis direction, the movement of the slider 12 to which the cutting tool 15 is fixed in the Y-axis direction, and the movement of the X-axis table 4 in the X-axis direction are synchronized with each other. The facing surface 31 of the workpiece 9 orthogonal to the moving direction in the Y-axis direction is cut into a predetermined curved surface predetermined by the cutting tool 15. The predetermined rotation speed determined in advance of the main shaft 14 is determined based on the maximum acceleration that the slider 12 can generate in order to maximize the machining efficiency. When the workpiece 9 is a lens, the opposing surface 31 is a concave lens surface, a convex lens surface, a toric lens surface, a progressive multifocal lens surface, a concave lens surface or a convex lens surface and a toric lens surface and / or a progressive multifocal lens surface. A lens surface such as a compound lens surface. In this curved surface machining method, when the facing surface 31 of the workpiece 9 is cut into a curved surface such as a toric shape, the stroke of the reciprocating movement in the Y-axis direction of the slider 12 to which the cutting tool 15 is fixed holds the workpiece 9. Thus, the value is set by subtracting the stroke of the movement of the main shaft 14 in the Z-axis direction, and the stroke of the slider 12 becomes shorter than when the main shaft 14 is fixed.
[0021]
FIG. 5 is a perspective view showing a case where the workpiece 9 cut by this curved surface processing method is a lens. FIG. 6 is a graph showing the movement relationship between the Z-axis direction and the Y-axis direction in this curved surface machining method. In the graph (A) of FIG. 6, when the vertical axis is the lens thickness and the horizontal axis is the radius of the lens, the symbol X is the optical axis and corresponds to the rotational axis of the main shaft 14. The graph (A) in FIG. 6 is the case where the Z-axis table 3 in the Z-axis direction is fixed, and the graph (B) in FIG. 6 is the case where the Z-axis table 3 in the Z-axis direction is moved along the RB locus. , FIG. 6C shows a relationship in which the curve center line RO of the graph of FIG. The shaded portions in each graph indicate the amount of movement of the slider 12 in the Y-axis direction in (B) and (C), and in (C), the Y-axis direction of the slider 12 when the Z-axis is moved along the sign RO locus. The amount of movement is shown.
[0022]
In this curved surface machining method, for example, the workpiece 9 is a resin lens, and as shown in FIG. 5, the curved surface to be cut into the workpiece 9 is the R shape radius value RL of the base and the R of the cross perpendicular to the base. In the case of a toric shape having a shape radius value RS, assuming that RB has a large radius RL and RC has a small radius RS (RL> RS), the trajectory of a sphere having a radius RB shown in FIG. When the movement to be processed is moved to the Z-axis table 3, as shown in FIG. 6B, the movement in the Y-axis direction of the slider 12 with the cutting tool 15 fixed is the movement amount corresponding to the R-shaped radius value RS of the cross. It is set to the difference (RC−RB) between RC and the movement amount RB corresponding to the base R shape radius value. Therefore, if the movement amount (for example, RC) of the slider 12 to which the cutting tool 15 is attached and the movement amount (for example, RB) of the main shaft 14 to which the workpiece 9 is attached to the vertical axis, the movement of the cutting tool 15 attached to the slider 12 is assumed. The amount is a difference (RC−RB), and the moving distance of the cutting tool 15 for cutting the lens surface is shorter than when the Z-axis table 3 is fixed.
[0023]
The predetermined predetermined curved surface cutting with respect to the facing surface 31 of the workpiece 9 is, for example, a lens for spectacles, and is made of a concave lens surface, a convex lens surface, a toric lens surface, a progressive multifocal lens surface, a concave lens surface or the like by a cutting tool 15. A lens surface such as a compound lens surface including a convex lens surface, a toric lens surface, and / or a progressive multifocal lens surface is cut, and an actual processing amount for the workpiece 9 is set to a predetermined processing command value. This is achieved by predictive learning control that takes repeated commands into account.
[0024]
In the NC processing machine 1, in particular, the X-axis table 4 is installed at a position facing the workpiece 9 and orthogonal to the Z-axis table 3, and is driven by a servo motor 10 to reciprocate in the X-axis direction. A turner 11 is installed on the X-axis table 4. The turner 11 includes a turner base 16 attached to a slide base 13 set and fixed to the X-axis table 4 via a support pin 35, a slider 12 that reciprocates in the Y-axis direction on the turner base 16, and a slider 12. The linear motor 18 is a driving device that reciprocates in the Y-axis direction. The slider 12 has a tool holder 28 at the tip, and the tool 15 is attached to the tool holder 28. The drive device is composed of a linear motor 18 incorporated in the turner 11 installed on the slide base 13 attached to the X-axis table 4. The slider 12 reciprocates on the track rail 17 constituting a bearing that is supported so as to be movable in the Z-axis direction via a slide guide 33 provided on the lower surface thereof.
[0025]
When the facing surface 31 of the workpiece 9 is cut by the cutting tool 15, the workpiece 9 is held by the chuck 8 provided at the tip of the spindle (C axis) of the headstock 5 and is rotated around the C axis by the spindle motor 7. For example, in order to optimize the machining efficiency, the rotational speed of the spindle 14 is set to a predetermined rotational speed so as to correspond to the maximum acceleration of the slider. Yes. The workpiece 9 is preferably a resin material (plastic) or a non-metal. The spindle 14 holding the workpiece 9 reciprocates in the Z-axis direction by driving the servo motor 6 in synchronization with the rotation, and the cutting tool 15 attached to the tip of the slider 12 accompanies the reciprocating motion of the slider 12. Reciprocating in the Z-axis direction and reciprocating in the X-axis direction together with the X-axis table 4. Since the NC machine 1 can be configured so that the weight of the slider 12 and the mass of the X-axis table 4 on which the turner 11 is placed can be made considerably small, the inertial force of the slider 12 can be reduced and the slider 12 can be reciprocated at a high acceleration. it can.
[0026]
Cutting on the workpiece 9 by the NC machine 1 is performed by controlling the spindle motor 7 for driving the spindle rotation and the servo motor 10 for driving the X-axis table 4 based on the numerical data. The rotation angle of 14 is continuously detected by a high-resolution rotary encoder. With respect to the linear motor 18 that drives the slider 12, the actual movement amount of the cutting tool 15 that changes by the reciprocating motion of the slider 12 is continuously detected by a linear scale 21 provided in the linear motor 18, and the detected value is the linear motor. It is used for control by 18 feedbacks. The NC control device controls the servo motors 6 and 10, the linear motor 18 and the spindle motor 7 to operate based on various information in order to cut the facing surface 31 of the workpiece 9 into a predetermined shape. . The position of the X-axis table 4 is also detected by the pulse coder, and the servo motor 10 for driving the X-axis table is NC-controlled.
[0027]
The NC processing machine 1 is provided with a turner 11 capable of handling high-speed and high-acceleration with a cutting tool 15 for cutting such as lens surface processing made of a resin material. The slider 12 is synchronized with the rotational movement of the main shaft 14 by the controller, and reciprocates in synchronization with the reciprocating movement of the Z-axis table 3 and the X-axis table 4, and is controlled following external data input, etc. The cutting tool 15 is used for cutting the facing surface 31 such as the lens surface of the workpiece 9 at a high speed and with a high acceleration.
[0028]
The turner 11 includes a turner base 16 composed of a pair of turner base members 16A and 16B each having recesses 40A and 40B extending in the longitudinal direction, and a slider 12 that reciprocates on the turner base 16. In the turner base 16, the recesses 40 A and 40 B of the turner base members 16 A and 16 B are arranged on the slide base 13 so as to face each other, and one turner base member 16 A is brought into contact with a locking step portion 27 formed on the slide base 13. The opposite surface 41A of the other turner base member 16B is brought into contact with the opposite surface 41A of the turner base member 16A and fixed by the width determining block 26 provided on the slide base 13, and fixed to the slide base 13. Has been.
[0029]
The recesses 40A and 40B in the longitudinal direction of the turner base members 16A and 16B are fixed to the slide base 13 so as to face each other, whereby the storage chamber 42 of the slider 12 is provided by the recesses 40A and 40B between the turner base member 16A and the turner base member 16B. Is formed. An upper lid 24 is attached to the upper ends of the turner base members 16A and 16B, and the upper portion of the accommodation chamber 42 is closed. The slider 12 is disposed in the accommodation chamber 42 of the turner base 16 so as to be reciprocally movable in the Z-axis direction. The slider 12 protrudes from an opening formed on the side of the storage chamber 42, and a cutting tool mounting member 45 is fixed to the front end thereof. A bite holder 28 is attached to the bite attachment member 45 attached to the tip of the slider 12. The cutting tool 15 is configured to be exchangeably set in the cutting tool holder 28. The cutting tool 15 can also be configured to be set on a cutting tool holder 28 attached directly to the slider 12.
[0030]
The NC processing machine 1 includes a linear motor 18 as a drive device for reciprocating the slider 12 with respect to the turner base 16 in the Y-axis direction (the same direction as the Z-axis direction). In this embodiment, the linear motor 18 that reciprocates the slider 12 includes a linear motor coil 19 that is an armature coil fixed to the turner base 16 and a linear motor magnet plate 20 that is a field magnet provided on the slider 12. It is comprised in the magnet movement type linear motor comprised from these. Of course, it can also be configured as a coil moving linear motor in which the armature coil moves. A track rail 17 constituting a linear guide extending in the Y-axis direction (the same direction as the Z-axis direction) orthogonal to the X-axis direction fixed on the slide base 13 is fixed to the turner base 16 at a plurality of locations. A slide guide 33 is fixed to the slider 12, and the slider 12 can reciprocate at high speed and high acceleration by reciprocating the slide guide 33 along the track rail 17 provided on the turner base 16.
[0031]
A linear scale 21 and a linear scale detector 22 extending along the linear motor coil 19 are provided for the reciprocal movement range or stroke of the slider 12. Therefore, the amount of movement of the slider 12 relative to the turner base 16 is immediately detected by the linear scale detector 22, and the information on the amount of movement is fed back to the controller, and the learning control function and prediction for the next movement control of the slider 12 are reflected. It is configured to be controlled by a learning control function. Further, a scale portion liner 39 is provided between the turner base 16 and the linear scale 21 for positioning the linear scale 21. Based on a predetermined machining command value, the controller uses a cutting tool 15 provided on the slider 12 to control the opposing surface 31 of the workpiece 9 and, if the workpiece 9 is a lens, to cut the lens surface. In addition, a learning control function and a foreseeing learning control function are provided to feed back the machining information and to make the difference between the machining information and the machining command value close to zero, and to make use of the machining 9 for the next machining.
[0032]
The turner base 16 is provided with a cooling plate 23 for cooling the linear motor coil 19. The linear motor magnet plate 20 turns off the magnetic force with the reciprocating movement of the slider 12 in the linear motor coil 19, but at that time heat is generated and becomes high temperature. The cooling plate 23 is provided to cool the heat generated in the linear motor coil 19. A reference block 32 is attached to the X-axis table 4 to adjust the parallelism between the turner shaft of the slide base 13 and the Z-axis of the Z-axis table 3. Since the adjustment block 36 is provided on the slide base 13, the slide base 13 is adjusted with respect to the reference block 32 by the adjustment screw 37 provided on the adjustment block 36, and the parallelism between the turner axis and the Z axis is increased. Adjusted.
[0033]
An LM liner 38 is provided between the turner base 16 and the track rail 17 in order to position the moving range of the slider 12 relative to the turner base 16. The turner base 16 is provided with stoppers 29 and 30 for restricting the stroke of the slider 12. The slider 12 is provided with a stopper abutting member 34 that abuts against the stoppers 29 and 30 and restricts the movement range of the slider 12. Wiring such as a power line and a signal line connected to a driving device provided in the turner 11 and piping for cooling for the turner include a guide cover 25 that can be bent as the slider 12 moves, a covering member, and the like. Is housed in.
[0034]
【The invention's effect】
The curved surface machining method of the workpiece according to the present invention is configured as described above, and therefore, the stroke of the slider movement amount to which the cutting tool is attached can be shortened by the amount that the spindle is moved in the Z-axis direction after the workpiece is attached. Since the slider that reciprocates with a linear motor can be made compact, the slider mass can be reduced, the inertia of the slider can be reduced, and the slider can be reciprocated at high speed and high acceleration. The reciprocating movement can be followed, the response can be improved, and a curved surface such as a toric shape with respect to the workpiece can be machined with high accuracy. When the slider, which is a movable object, moves at the same acceleration, the reaction force is determined by the mass of the slider, and the fixed object that receives the reaction force (the turner base and the X-axis table to which it is attached) depends on the magnitude of the reaction force. ) Is determined, the smaller the reaction force generated by the movable object, the smaller the device itself, and there is no need to increase the mass of the device itself.
[Brief description of the drawings]
FIG. 1 is a schematic plan view for explaining an NC processing machine for achieving a curved surface machining method for a workpiece according to the present invention.
FIG. 2 is a front view showing a turner in the NC processing machine of FIG. 1;
FIG. 3 is a plan view showing the turner of FIG. 2;
FIG. 4 is a side view showing the turner of FIG. 2 and showing a state where a cutting tool is removed from the turner.
FIG. 5 is a perspective view showing a lens of a workpiece cut by the curved surface machining method.
FIG. 6 is a graph showing the movement relationship between the Z-axis direction and the Y-axis direction in this curved surface processing method.
[Explanation of symbols]
1 NC machine
2 Processing machine base
3 Z-axis table
4 X-axis table
5 Headstock
6 Servo motor
7 Spindle motor
9 Workpiece
10 Servo motor
11 Thana
12 Slider
13 Slide base
14 Spindle
15 bytes
16 Turner base
16A, 16B Turner base member
17 Track rail (Linear guide)
18 Linear motor
19 Linear motor coil (armature coil)
20 Linear motor magnet plate (field magnet)
21 Linear scale
22 Linear scale detector
28 Byte holder
31 Opposite surface (lens surface)
43 turret
44 bytes

Claims (8)

A main shaft for holding a workpiece rotatably supported by the main shaft, a Z-axis table capable of reciprocating the main shaft in the Z-axis direction, and an X disposed at a position facing the main shaft and orthogonal to the Z-axis direction X-axis table reciprocally movable in the axial direction, turner base attached to the X-axis table, slider capable of reciprocating in the Y-axis direction parallel to the Z-axis direction on the turner base, and attaching the bite, and the slider In a processing method for cutting the workpiece using an NC processing machine having a drive device for reciprocating the Y-axis in the Y-axis direction,
The drive device for reciprocating the slider is constituted by a linear motor, the spindle holding the workpiece is rotated at a predetermined rotation speed, the spindle moves in the Z-axis direction, the bite The movement of the slider to which the tool is fixed in the Y-axis direction and the movement of the X-axis table in the X-axis direction are synchronized with each other, and the opposed surface of the workpiece perpendicular to the Y-axis movement direction of the tool is set to the tool bit. A method of processing a curved surface of a workpiece, comprising cutting into a predetermined curved surface determined in advance. 2. The curved surface of a workpiece according to claim 1, wherein the linear motor includes a field magnet incorporated in one of the slider and the turner base and an armature coil incorporated in the other. Processing method. 3. The curved surface machining method for a workpiece according to claim 2, wherein a linear scale is mounted on the turner base incorporating the linear motor to detect the position of the slider. When the workpiece is cut into the predetermined curved surface, the stroke of the reciprocating movement in the Y-axis direction of the slider to which the tool is fixed is the movement in the Z-axis direction of the main shaft holding the workpiece. The curved surface machining method for a workpiece according to any one of claims 1 to 3, wherein the value is set to a value obtained by subtracting only the stroke. When the predetermined curved surface to be cut into the workpiece has a toric shape composed of an R shape radius value of a base and an R shape radius value of a cross orthogonal to the base, the main shaft holding the workpiece The movement in the Z-axis direction is set to a movement amount corresponding to the R-shaped radius value of the base, and the movement in the Y-axis direction of the slider with the bit fixed is a movement corresponding to the R-shaped radius value of the cross. The curved surface machining method for a workpiece according to any one of claims 1 to 4, wherein the curved surface machining method is set to a difference between the amount and a movement amount corresponding to an R shape radius value of the base. Cutting of the predetermined curved surface of the workpiece is achieved by predictive learning control that takes into account repeated commands in order to bring the actual machining amount for the workpiece closer to a predetermined predetermined machining command value. The curved surface machining method for a workpiece according to any one of claims 1 to 5. The method of processing a curved surface of a workpiece according to any one of claims 1 to 6, wherein the workpiece cut into the predetermined curved surface by the cutting tool is a lens for eyeglasses. The curved surface machining method for a workpiece according to claim 1, wherein the slider is set to reciprocate N times for one rotation of the main shaft.

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