JP2002137146A - Aspherical machining device and machining method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To realize improvement of reliability of machining precision and to enable machining of an aspherical lens of high quality by correcting displacement in a relative speed at which each drive shaft during machining reaches a target position and accurately keeping a position relation being a target of each drive shaft. SOLUTION: A tool angle detecting dog 10 to detect the position of a tool longitudinal moving shaft 7 moved in the direction of an arrow mark A on a tool angle moving shaft 6 and a tool angle detecting sensor 13 are provided. Further, a tool fore and aft detecting dog 11 to detect the position of the tool longitudinal moving shaft 7 to move a tool rotary shaft 5, holding a tool 3, in the direction of an arrow mark C and a tool fore and aft detecting sensor 14 are provided, and a work fore and aft detecting dog 12 to detect the position of a work longitudinal moving shaft 8 to move a work 7 in the direction of an arrow mark B and a work fore and aft detecting sensor 15 are provided. A difference between a time at which the tool angle detecting dog 10 passes the tool angle sensors 13 and 13 and a time at which the tool fore and aft detecting dog 11 and the work fore and aft detecting sensor 12 pass through the tool fore and aft detecting sensors 14 and 14 and the work fore and aft detecting sensors 15 and 15 is determined and the moving speeds of the tool rotary shaft 5 and the work fore and aft moving shaft 8 are corrected.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an optical aspherical lens processing machine and a processing method, and a die processing machine and a processing method for forming an aspherical lens.

[0002]

2. Description of the Related Art Japanese Patent Application Laid-Open No. 5-138521 discloses a prior art relating to an aspherical surface processing apparatus and method. The processing device includes a linearly movable tool drive shaft to which a processing tool is attached, a work drive axis to which a workpiece to be processed by the above processing tool is attached, and which is linearly movable in a direction perpendicular to a moving direction of the tool drive axis. A swing drive shaft that swings the work drive shaft to swing the work, the tool drive shaft is arranged parallel or perpendicular to the swing drive shaft, and the tool drive shaft and the work drive shaft are rotatable. Has become.

When a work is machined by this machining apparatus, the work is rotated and moved, and the work is rotated, rocked and moved, and the work is machined into an aspherical shape by the work tool. At this time, at the swinging position of the work due to the turning of the work drive shaft, the position coordinates of the processing tool and the work that create the aspherical shape are calculated by using the calculation function of the relative positional relationship, and based on the calculation result. Then, each drive shaft is driven to move to the above-mentioned position coordinates, and the swinging work is processed into a desired aspherical shape.

[0004]

In the prior art described above, a plurality of drive shafts (a tool drive shaft, a work drive shaft, and a swing drive shaft) required for aspherical machining of a workpiece are maintained in a relative positional relationship. In addition, it is necessary to derive the moving speed of each drive axis using a complicated calculation formula using the calculation function attached to the processing equipment.However, the number of digits that can be handled by the calculation function is often limited, in which case the calculation process Due to the effects of rounding down or rounding up the lower digits performed in the above, there may be a case where a speed is generated such that a slight shift occurs in the time when each drive axis reaches the target position coordinates during machining. Therefore, there is a possibility that a relatively small deviation occurs relative to the target positional relationship of each drive shaft, and the processing accuracy is delicately affected.

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and corrects a deviation in relative speed at which each drive shaft reaches a target position at the time of machining. It is an object of the present invention to provide an aspherical surface processing apparatus and a processing method capable of realizing an improvement in the reliability of processing accuracy by maintaining the accuracy of (1) and capable of processing a high-quality aspherical lens.

[0006]

According to a first aspect of the present invention, there is provided an aspherical surface processing apparatus comprising: a drive shaft for holding a work tool; a drive shaft for holding a work; And a plurality of drive shafts for rotating the work relative to each other, the aspherical surface processing device for processing the work into an aspherical shape by contacting the work tool with the work according to the relative positional relationship of each drive shaft. A detection function for detecting a relative difference in arrival time of each drive shaft to a target position, and storage means for storing a detection result obtained by this detection function,
It is characterized by having a correction means for correcting the moving speed of each drive shaft using the detection result.

According to a second aspect of the present invention, there is provided a method for machining an aspherical surface, comprising: a drive shaft for holding a machining tool; a drive shaft for holding a work; and a drive shaft for relatively rotating the machining tool and the work. In the aspherical surface machining method of moving the workpiece and making the workpiece into an aspherical shape by bringing the machining tool into contact with the workpiece according to the relative positional relationship of each drive shaft, the arrival time of each drive shaft to the target position is detected, The moving speed of each drive shaft is corrected by the difference between the detection result and the arrival time of each drive shaft at the target position when processing a desired aspherical shape,
Each drive shaft is moved and processed based on the corrected moving speed.

That is, in the aspherical surface processing apparatus and the processing method of the present invention, a plurality of points for each drive shaft to reach each target position at the same timing at the time of processing a work by a processing tool are provided for each drive shaft. The passing time of each drive axis is detected for each point using the current position recognition function inside the sensor or controller, the difference in the passing time with each drive axis based on the passing time of a certain drive axis is detected, and the detection time difference is detected. It is stored in the control function attached to the processing device. At this time, based on the distance L between the points, the movement times T and T1 between the points of each drive shaft, and the detection time difference t = T-T1, the correction speed of another drive shaft is determined based on the movement speed of one drive shaft. Can be Then, the correction speed is added to the actual speeds of the other drive shafts having a time difference to obtain an ideal moving speed V, and this ideal speed V is stored in the control function. The operation is performed at the speed V, and the aspherical surface processing of the work is performed.

According to the above configuration, it is possible to obtain an almost ideal speed with respect to all the other drive shafts with respect to a certain drive shaft. It is possible to greatly reduce the possible deviation of the relative positional relationship between the drive shafts, and it is possible to make the processing accuracy as close as possible to the ideal value.

[0010]

(Embodiment 1) Embodiment 1 of the present invention will be described with reference to FIG. FIG. 1 is a schematic configuration diagram of the aspherical surface processing apparatus of the present embodiment viewed from above.

In FIG. 1, a tool angle moving shaft 6 as a drive shaft for relatively rotating a working tool and a work, a tool longitudinal moving shaft 7 as a drive shaft for holding a working tool, a work The three axes of the workpiece longitudinal movement axis 8 are mounted as drive axes for holding the workpiece. Tool angle movement axis 6
Is capable of turning the tool longitudinal movement shaft 7 in the direction of arrow A.

A work rotating shaft 4 for rotating the work 2 is mounted on the work longitudinal movement shaft 8, and the work 2 is attached to a tip of the work rotating shaft 4. The work 2 rotates around the axis of the work rotating shaft 4. Is done. The work longitudinal movement axis 8 is linearly movable in the direction of arrow B, and the work 2 is linearly moved in the direction of arrow B at the same speed as the work longitudinal movement axis 8.

A tool rotation shaft 5 for rotating the tool 3 as a machining tool at high speed is mounted on the tool longitudinal movement shaft 7. The tool 3 is attached to the tip of the tool rotation shaft 5 and is arranged so as to face the processing surface of the work 2, and the tool 3 is rotated around the axis of the rotation tool shaft 5. The rotary tool shaft 5 is
The tool 3 is linearly movable in the direction of the arrow C, and the tool 3 is linearly moved in the direction of the arrow C at the same speed as the rotary tool shaft 5. Section.

Further, state recognition such as the position of each axis 5, 7, 8 and the like and data processing analyzing the state, each axis 6, 7, 8
A control function 9 having storage means and correction means capable of giving an operation command to the like is installed, and the position of each axis 5, 7, 8 and its moving speed are simultaneously controlled by the command of the control function 9, and The workpiece 2 and the tool 3 contact each other, so that the workpiece 2 is aspherically processed.

A tool angle detection dog 10 is attached to the tool longitudinal movement shaft 7 and is turned together with the tool longitudinal movement shaft 7 in the direction of arrow A.
A plurality of tool angle detection sensors 13 are provided at arbitrary positions that can be detected by the tool angle detection tool, and it is possible to detect the passage of the tool longitudinal movement axis 7 which is turned by the tool angle movement axis 6. Further, a plurality of tool front / rear detection sensors 14 are provided on the tool front / rear movement shaft 7 at arbitrary positions along the arrow C direction,
A tool front / rear detection dog 11 which is linearly moved in the direction of arrow C together with the tool rotation axis 5 is attached to a position where the tool front / rear detection sensor 14 can be detected. It is possible to detect the passage of the tool rotating shaft 5 which is linearly moved in the direction of arrow C by the tool longitudinal movement shaft 7.

When the workpiece 3 is machined by the tool 3, the respective tool angle detection sensors 13 and the tool front-rear detection sensors 14 detect the respective tool angle detection sensors 13 in the target aspherical portions. When the tool longitudinal movement axis 7 is located at a theoretically opposite position that can be detected by the angle detection doc 10, the tool rotational axis 5, that is, the tool longitudinal detection sensor 1 at the point where the tool 3 is theoretically located
A tool front / rear detection sensor 14 is provided at a position where 4 is detected by the tool front / rear detection dock 11. That is, at the same time when the tool angle detection dog 10 of the tool longitudinal movement shaft 7 that is turned by the tool angle movement shaft 6 passes through the respective tool angle detection sensors 13, the tool rotation shaft 5
When the tool front / rear detection dog 11 passes through the tool front / rear detection sensor 14, the tool front / rear movement axis 7 and the tool rotation axis 5 are positioned so that the tool 3 is positioned at a position where the target aspherical part can be machined. The tool angle detection sensor 13 and the tool front-rear detection sensor 14 are provided in such a positional relationship as to be able to be positioned at the target position.

On the other hand, a work front-rear detection dog 12 is attached to the work front-rear movement shaft 8, and is moved in the direction of arrow B together with the work front-rear movement shaft 8.
A plurality of work front-rear detection sensors 15 are provided along the direction of the arrow C at positions where can be detected. The work front / rear detection sensor 15 is provided with reference to the tool angle detection sensor 13. When the work front / rear detection dog 12 passes through the respective work front / rear detection sensors 15, the tool 3 of the rotary tool 5 located at the target position is provided. On the other hand, the work 2 can be moved so as to create an ideal aspherical shape.

An aspherical surface processing method using the aspherical surface processing apparatus configured as described above will be described. In FIG. 1, in a target aspherical shape, sensor passing points at which a tool angle detection dog 10 of a tool longitudinal movement shaft 7 swiveled by a tool angle movement shaft 6 passes through a tool angle detection sensor 13 are defined as a1, a2, a3,..., and when the tool front-rear detection dock 11 is moved in the direction of arrow C by the tool front-rear movement axis 7 and passes through the tool front-rear detection sensor 14, the tool front-rear detection corresponding to the sensor passing points a1, a2, a3,. Dog 1
, And the pitch between the tool angle detection sensors 13 is a2-a1.
= La1, the pitch between the tool front-back detection sensors 14 is b2
-B1 = Lb1. In addition, a theoretical moving speed of the workpiece longitudinal moving shaft 8 at which a target aspherical shape can be obtained corresponding to the moving speed of the tool angle moving shaft 7 is obtained. According to these data, the control function 9 moves the tool longitudinal movement axis 7, the tool rotation axis 5 and the work longitudinal movement axis 8 at the theoretical movement speed, respectively, and rotates the rotating work 2. The machining operation is performed by the tool 3.

During the aspherical machining operation, each of the sensors 13, 1
4, the respective sensor passing points a1, a2, b
The passing time of 1 and b2 is detected, and the detected time is stored in the control function 9. Then, based on the passing time Ta2 of the sensor passing point a2 (the time required to pass from the sensor passing point a1 to the sensor passing point 2a), the sensor passing point a2 in the target aspherical shape is used.
Time Tb2 of the sensor passing point b2 relative to
(The time required for passing the sensor passing point ba from the sensor passing point b1) is detected, and the difference Ta2-Tb2 between the passing time Ta2 and the passing time Tb2 is calculated as Lb1 / Lb1 /
(Ta2-Tb2) is set to sensor passing points b1, b2
It is obtained as the correction speed of the rotary tool shaft 5 during the rotation. Further, the passage time of the sensor passing points a3,..., B3,... After the sensor passing points a2, b2 is detected, and the entire surface of the workpiece 2 is machined by the tool 3 based on the moving speed of the tool longitudinal movement shaft 7. The correction speed of the rotary tool shaft 5 between the sensor passing points b3,.

Also, the work front / rear detection dog 12 passing through the work front / rear detection sensor 15 corresponding to the sensor passing points a1, a2,.
, The passing time between the sensor passing points c1, c2,... Is detected, and each passing point c1 when the entire surface of the workpiece 2 is machined in the same manner as the tool rotating shaft 5 with reference to the moving speed of the tool angle moving shaft 7. , C2, ..., the correction speed of the work longitudinal movement axis 8 is determined. From the next time when a new workpiece 2 is machined, the tool rotation axis 5 and the workpiece longitudinal movement axis 8 are moved by the arrow C at a moving speed obtained by adding the correction speed obtained between the sensor passing points between the sensor passing points. Then, the workpiece 2 is moved in the direction of arrow B to perform aspherical processing of the workpiece 2.

According to this embodiment, when the tool longitudinal movement axis 7, the tool rotation axis 5 and the work longitudinal movement axis 8 are relatively moved and machined into the target aspherical shape, the aspherical shape is used. The detection sensors 13, 14, 1 of the axes 7, 5, 8 are located at positions where the axes 7, 5, 8 relatively match on the trajectory.
5, and by detecting the movement of each of the axes 7, 5, 8 that move relatively, it is possible to recognize the difference between the actual operation and the ideal operation in the machining operation. By calculating the correction speed of the moving speed 8, the relative positional relationship between the axes 7, 5, and 8 can be corrected, and the workpiece 2 can be processed into a target aspherical shape.

(Embodiment 2) Embodiment 2 of the present invention will be described with reference to FIG. FIG. 2 is a schematic configuration diagram of the aspherical surface processing apparatus of the present embodiment viewed from above. In the present embodiment, the detection dogs 10 and 10 of the first embodiment shown in FIG.
11 and 12 and the respective detection sensors 13, 14 and 15 are removed, and the other configuration is the same as that of the first embodiment, and the description is omitted.

An aspherical surface processing method using the aspherical surface processing apparatus having the above configuration will be described. 2, a plurality of arbitrary passing points a1, a2,... Are set in the process of moving the tool longitudinal movement axis 7 by the tool angle movement axis 6 during machining and stored in the control function 9, and the target is set by the control function 9. Point on the tool longitudinal movement axis 7 corresponding to the passing points a1, a2,...
, The theoretical passing point b of the tool rotation axis 5 on the tool longitudinal movement axis 7 that passes simultaneously with the passing points a1, a2,.
Are calculated in the control function 9. further,
The control function 9 calculates the theoretical passing points c1, c2,... On the work longitudinal movement axis 8 that are relative to the passing points a1, a2,. In addition, the theoretical moving speed of the tool longitudinal movement shaft 7 and the work longitudinal movement shaft 8 that will obtain the target aspherical shape corresponding to the moving speed of the tool angle moving shaft 6 is obtained. And according to those data,
The control function 9 moves each of the tool longitudinal movement axis 7, the tool rotation axis 5 and the work longitudinal movement axis 8 at a theoretical moving speed, and performs a machining operation on the rotating workpiece 2 with the rotating tool 3. .

During the aspherical surface machining operation, the control function 9
.., B1, b2,..., C1, c2,..., The passing time of each passing point a1, a2,.
Passing point b1, b2 of each axis 5, 8 based on
., C1, c2,...
Then, the correction speeds of the respective axes 5 and 8 are obtained in the same manner as in the first embodiment, and the respective axes 5 and 8 are moved at a speed obtained by adding the correction speeds. Do.

According to the present embodiment, since the position detection of each axis 6, 7, 8 is performed only by the control function 9, the structure can be simplified as compared with the first embodiment. , 14 and 15 and the response of the recognition of the current position is good, so that the processing reliability can be ensured and a more accurate aspherical shape can be obtained.

[0026]

As described above, according to the aspherical surface processing apparatus and the processing method of the present invention, the calculation that occurs when a complicated calculation formula for obtaining the processing data of the aspherical shape is obtained for each drive shaft. Since the relative error of the speed of each drive shaft due to the repetition of rounding up and down of the lower digit in the middle can be corrected, the error of the relative positional relationship due to the relative error of the speed is eliminated, and the non-ideal A spherical shape can be obtained.

[Brief description of the drawings]

FIG. 1 is a schematic configuration diagram of an aspherical surface processing apparatus according to a first embodiment of the present invention as viewed from above.

FIG. 2 is a schematic configuration diagram of an aspherical surface processing apparatus according to a second embodiment of the present invention as viewed from above.

[Explanation of symbols]

 1 Frame 2 Work 3 Tool 4 Work rotation axis 5 Tool rotation axis 6 Tool angle movement axis 7 Tool back and forth movement axis 8 Work back and forth movement axis 9 Control function 10 Tool angle detection dog 11 Tool front and rear detection dog 12 Work front and back detection dog 13 Tool angle Detection sensor 14 Tool front / rear detection sensor 15 Work front / rear detection sensor

Claims (2)

[Claims] 1. A drive shaft for holding a machining tool, a drive shaft for holding a work, and a plurality of drive shafts for rotating the machining tool and the work relative to each other, and a relative position of each drive shaft. In an aspherical surface processing device that processes a workpiece into an aspherical shape by contacting the workpiece with the workpiece according to the relationship, a detection function that detects the relative difference in the arrival time of each drive shaft to a target position, and this detection function An aspherical surface processing apparatus, comprising: storage means for storing a detection result obtained by the method; and correction means for correcting the moving speed of each drive shaft using the detection result. 2. A drive shaft for holding a processing tool, a drive shaft for holding a work, and a drive shaft for relatively turning the work tool and the work are moved, and processing is performed based on a relative positional relationship between the drive shafts. In an aspherical surface processing method of processing a workpiece into an aspherical shape by contacting a tool with the workpiece, the arrival time of each drive shaft to a target position is detected, and this detection result is used when processing a desired aspherical shape. Aspherical surface processing wherein the moving speed of each drive shaft is corrected based on the difference from the arrival time of each drive shaft to a target position, and each drive shaft is moved and processed based on the corrected moving speed. Method.