JPH06320407A - Curved surface grinding device - Google Patents

Abstract

(57) [Abstract] [Purpose] It is an object to provide a curved surface grinding apparatus capable of processing a workpiece having a concave curved surface or a convex curved surface with high accuracy. A work surface of a workpiece A mounted on a movement-adjustable auxiliary plate 11 is attached to the arm 3 that moves horizontally around a main shaft 2 or the tip of a vibrating oscillating plate. Rotation of tools 4 and 5 enables grinding to mirror finishing.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for processing a metal or non-metal surface having a curved surface such as a spherical surface, an aspherical surface, a composite surface with a cylindrical shape, and a metal for an injection mold for a plastic lens. The present invention relates to a device applicable to processing a piece.

[0002]

2. Description of the Related Art With the downsizing and weight reduction of copying machines and facsimiles, the precision and complexity of plastic lenses, which are optical system components used therein, are advancing. Further, the metal piece used for molding the plastic lens is required to have higher accuracy.

A curved surface is created by a conventional hand lapping means or electric discharge machining, and then a vertical lapping apparatus is used in the final lapping finish, but the previous step is complicated. Yes, it is difficult to manufacture in a short period of time, and it is impossible to obtain higher accuracy. Also in the vertical wrapping device, the lapping liquid accumulates in the central portion of the inner surface of the concave curved metal piece, which easily scratches the mirror surface portion and can satisfy the precision required for the metal piece. There wasn't.

[0004]

SUMMARY OF THE INVENTION According to the present invention, a workpiece having a concave or convex curved surface can be ground and lapped with high precision by a single device. An object is to provide a curved surface grinding processing device.

[0005]

According to the present invention, in order to achieve the above object, a machined surface of a work piece can be mounted sideways, and the position of the work piece can be moved and adjusted to the side of a work tool. , An arm that can move horizontally about the main axis along the machining surface of the workpiece, and an arm that is detachably attached to the tip of the arm and that gives a predetermined rotation during machining. And a processing tool that is supported on the auxiliary plate, and the processing surface of the workpiece supported by the auxiliary plate is processed by the processing tool that is supported at the end of the arm.

According to the present invention, a machining surface of a work piece can be mounted sideways, and an auxiliary plate capable of moving and adjusting the position of the work piece to the work tool side, and the work surface of the work piece. Along an axis that can move horizontally about the main axis, a swing plate that moves in the same direction as the arm, and is given a vibration during the movement, and is attached to or detached from the tip of the swing plate. And a processing tool which is attached to the auxiliary plate so that a predetermined rotation can be given at the time of processing, and the processing surface of the workpiece supported on the auxiliary plate is processed by the processing tool supported by the swing plate end. It is a feature.

[0007]

According to the structure of the present invention, any processing can be performed and the processing tool can be attached by mounting the auxiliary member depending on the concave or convex curved surface of the workpiece. The arms or the rocking plates attached to the arms can rock along a horizontal plane, respectively, so that chips and machining liquid can be easily removed from the surface of the workpiece, enabling highly accurate machining of the surface. Moreover, by only exchanging the processing tools, it is possible to perform grinding processing and mirror surface processing with a single device.

[0008]

Embodiments of the present invention will be described below with reference to the drawings. 1 and 2 show a curved surface grinding apparatus showing a first embodiment according to the present invention, showing respective plane and side states. The curved surface grinding apparatus of this embodiment has a configuration suitable for grinding a workpiece A having a concave curved surface shape.

In this curved surface grinding machine, an arm 3 is mounted on a base body 1 made of cast metal, which can be swung about a main shaft 2 by a predetermined angle. Arm 3
A tool, one end of which is supported by the main shaft 2 that serves as the center of rotation, and the other end of which is the rotating tip side, in which the electrodeposition grindstone 4 is replaced during grinding and the lap piece 5 is replaced during lapping, as shown in FIG. The mounting portion 6 is mounted. A drive system for rotating the arm 3 by a predetermined angle is arranged in the middle of the arm 3.

The drive system includes a motor 7 installed on the arm 3, a pinion 8a provided on the shaft of the motor 7, and a concave rack 9 arranged on the pinion 8a and the base body 1. And a pinion 8b located between the two. The base body 1 is provided with adjustable proximity switches 10 on both sides of the arm 3 in order to limit the range of rotation of the tip of the arm 3 that is moved by the drive system.

Workpiece A having a concave curved surface as a member to be processed
Is arranged on the auxiliary plate 11 and is provided with two tightening plates 12
The auxiliary plate 11 is fixed by the base body 1
It is supported by the four slide units 13 provided above, and is engaged with the ball screw 14 penetrating the central portion thereof.

The slide unit 13 has a dovetail-shaped slide bearing formed on the lower surface of the auxiliary plate 3 in order to move the auxiliary plate 11 in the left-right direction on the base body 1, and the slide unit 13 is attached to the slide bearing. The ends of are engaged. A ball speed reducer 15 is attached to an end of the ball screw 14, and the auxiliary plate 11 supporting the work A having a concave curved surface is rotated by a slide unit by the rotation of the ball screw 14 by the operation of the ball speed reducer 15. It is possible to move in a predetermined direction guided by 13.

A motor 16 for rotating an electrodeposition grindstone 4 or a lap piece 5 attached to the tip of the arm 3 is arranged on the arm 3 on which the main shaft 2 is located. The rotation of the motor 16 is on the side surface of the arm 3. Supported timing belt 17a,
It is transmitted via 17b and 17c to the pulley 18 provided at the end of the shaft portion to which the electrodeposition grindstone 4 or the lap piece 5 is attached. Reference numeral 19 is a hose that supplies a grinding liquid or a lapping liquid to the processed surface during processing.

In the curved surface grinding machine having the above construction, the work A having a concave curved surface to be machined is installed on the auxiliary plate 11, and the electrodeposition grindstone 4 or the lapping piece 5 is attached to the tip of the arm 3 for electrodeposition. The grindstone 4 or the lap piece 5 is brought into contact with the surface of the work A. In this state, the motor 16
The electrodeposition grindstone 4 or the lap piece 5 is rotated by the operation of, and the arm 3 is rotated by a predetermined angle by the operation of the motor 7, and
When the work A having a concave curved surface shape is moved to the side of the electrodeposition grindstone 4 or the lap piece 5 by the operation of the ball speed reducer 15, the electrodeposition grinding stone 4 or the lap piece 5 causes the surface of the work A having a concave curved surface shape to be highly accurately formed. Can be mirror-finished.

Next, with reference to FIGS. 4 and 5, description will be given of a curved surface grinding apparatus suitable for processing a convex curved surface-shaped workpiece A ₁ showing a second embodiment of the present invention. In this embodiment, the same reference numerals are given to the same configurations as the first embodiment. In this embodiment, an auxiliary arm 20 is provided at the tip of the arm 3 that rotates about the main shaft 2 so that the movement of the workpiece for processing conforms to the surface of the workpiece A ₁ having a convex curved surface shape.

In the case of the work A having the concave curved surface shape, since the electrodeposition grindstone 19 or the lapping piece 20 is arranged so as to face the surface of the work A, the auxiliary arm 20 is not required, In the case of the work A _{1 having} a convex curved surface shape, the auxiliary wheel 20 is required because the processing wheel is arranged at a position beyond the work A ₁ . Auxiliary arm 20
Has one end 20a fixed to the tip of the arm 3 and the other end 20b.
Is provided with a grindstone unit 21, and in this grindstone unit 21, a diamond wheel 22 for grinding or a cerium pad wheel for lapping is exchangeably arranged as a processing wheel.

As a rotary drive system for the diamond wheel 22 for grinding or the cerium pad wheel for lapping, unlike the case of the workpiece having the concave curved surface shape described above,
A dedicated stage 23 for motor installation is arranged at a position above the motor 7 for arm rotation provided in the middle of the arm 3.
A processing wheel drive motor 24 is installed on the dedicated stage 23. The rotation of the motor 24 is transmitted to the processing wheel via the flexible tube 25.

On the auxiliary plate 11, a pair of bearing blocks 26a to which both ends of the work A ₁ can be attached,
26b is installed, and the work A ₁ as a member to be processed having a convex curved surface shape is supported by the bearings of the pair of bearing blocks 26a and 26b. As a drive system for the work A ₁ , a motor 27 is installed at the end of one bearing block 26a, and the rotation of the motor 27 is passed through a timing belt 28 to a bearing that supports one end of the work A _1. Transmitted. In this processing apparatus, the adjustment of the curved surface dimension during the processing of the work A ₁ is performed by moving the diamond wheel 22 back and forth by operating the fine adjustment screw 29.

In this embodiment, the convex curved work A ₁ is supported by the mounting shafts of the bearing blocks 26a and 26b provided on the auxiliary plate 11, and is rotated by the drive of the motor 27 so that the grindstone unit 21 can be rotated. The diamond wheel 22 or the serum pad wheel mounted is rotated by the drive of the wheel driving motor 24, and the diamond wheel 22 or the serum pad wheel in this rotating state rotates the arm 3 by the motor 7 and the ball speed reducer. by moving the work a ₁ of the convex curved surface of the working wheel side by the operation of 15, the surface of the work a ₁ of the convex curved surface shape can be processed into a mirror surface.

6 and 7 show a curved surface grinding machine for processing a concave curved surface as another embodiment of the present invention. The difference between this embodiment and the first embodiment is that the first embodiment is different from the first embodiment. In one embodiment, the processing grindstone or wheel is arranged at the end of the arm 3 that rotates about the main shaft 2, whereas in this embodiment, the processing grindstone or wheel is Like the arm 3, it is not arranged at the end of the rotating arm but is attached to the end of a swing plate 30 which is pivotally supported by the main shaft 2 and vibrates following the arm.

The arm 3 is pivotally supported by the main shaft 2 and is rotated by a predetermined angle by the drive of the motor 7, which is similar to the above embodiment, but the grinding stone or wheel for processing is the arm. Similarly to the reference numeral 3, it is attached to the tip of a swing plate 30 which is pivotally supported by the main shaft 2 and rotates. The support plate 35 attached to the arm 3 is positioned above the swing plate 30,
The motor 7 is arranged on the support plate 35.

As for the relationship between the swing plate 30 and the arm 3, as is apparent from FIG. 8, the swing plate 30 is arranged in a state of being superposed on the arm 3, and a motor is provided at the tip of the arm 3. 31
The eccentric cam 32 fixed to the tip of the shaft of the motor 31 is a cam house 33 fixed to the side surface of the swing plate 30.
It is fitted and locked in the notch opening 34. A grindstone driving motor 16A is mounted on a part of the oscillating plate 30, and the grindstone driving motor 16A connects the grindstone 4 or the lap piece 5 attached to the end of the oscillating plate 30 to the timing belt 1.
It can rotate via 7d, 17e.

Therefore, the rocking plate 30 having a grindstone or a wheel attached to the tip thereof follows the operation of the arm 3 which rotates in a predetermined range through the pinion 8 and the rack 9 by the operation of the motor 7. At the same time, vibration is imparted by the operation of the eccentric cam 32 by the operation of the motor 31 built in the tip portion of the arm 3, and as a result, the processing grindstone or wheel attached to the tip of the oscillating plate 30 is Processing member A ₂
Subtle vibration is given while moving along the machining surface of.

In this case, the oscillating plate 30 transmits the rotation of the arm 3 through the eccentric cam 32, so that the speed of the arm by the motor 7, the rotational speed of the grindstone by the grindstone driving motor 16A, and the eccentric cam 32. By selecting the swing speed by the rotation speed, the swing width by the eccentric cam 32, etc., the work A ₂ having a concave curved surface shape processed by the final lapping is
It is possible to process with mirror surface accuracy with very few scratches.

In this embodiment, the rocking motor 31 is not operated during grinding, and the rocking plate 30 is operated in the same manner as the arm 3. At this time, use a grinding motor of 7000r
pm, wheel speed 10,000 rpm, arm movement speed 1
00 mm / min, cut of workpiece A ₂ with concave curved surface 0.0
Grinding is performed with a length of 016 mm. Then, during the lap, the oscillating motor 31 is operated at a rotation speed of 500 rpm, the eccentric cam 32 oscillates the oscillating plate 30 in an oscillating width of 2 mm, the arm moving speed is 100 mm / min, and the lap piece rotational speed is 100 mm / min. Workpiece A ₂ lapped at 200 rpm
The surface of (1) had good mirror surface accuracy.

When the surface of the workpiece is mirror-finished, comparing the case where the lap piece is directly attached to the arm and the case where the lap piece is attached to the rocking plate, the former surface roughness is 0.2.
μRmax, whereas the surface roughness of the latter is 0.1
It was confirmed that the surface roughness was remarkably improved when the lap piece was attached to the rocking plate.

[0027]

According to the structure of the present invention, since the arm or the driven plate to which the working tool is attached respectively moves along the horizontal plane, it is easy to remove the chips and the working liquid on the surface of the work piece, and the precision is high. It has an effect that the surface can be processed, and that the grinding process and the mirror surface process can be performed by one device by only changing the processing tool.

Further, in the present invention, the basic structure is shared, and by adding or removing the structure corresponding to the convex surface or the concave surface, it is possible to grind both the convex surface and the concave surface. . Further, in the case where the processing tool is provided on the oscillating plate, the accuracy of the surface roughness can be significantly improved as compared with the case where the processing tool is directly provided on the arm.

[Brief description of drawings]

FIG. 1 is a drawing showing a plane of a first embodiment suitable for processing a concave curved surface in a curved surface grinding processing apparatus of the present invention.

FIG. 2 is a view showing a side surface of FIG.

FIG. 3 is an enlarged view of a supporting portion of the processing tool in FIG.

FIG. 4 is a drawing showing a plane of a second embodiment suitable for processing a convex curved surface in the curved surface grinding processing apparatus of the present invention.

FIG. 5 is a view showing a side surface of FIG.

FIG. 6 is a plan view showing a plane of a third embodiment for applying a vibration to a working tool in the curved surface grinding processing apparatus of the first embodiment suitable for processing the concave curved surface of the present invention.

FIG. 7 is a view showing a side surface of FIG.

FIG. 8 is a schematic cross-sectional view showing the relationship between the arm and the oscillating plate in the third embodiment.

[Explanation of symbols]

 A Workpiece member 1 Base body 2 Spindle 3 Arm 4, 5 Processing tool 11 Auxiliary plate 20 Auxiliary arm 22 Processing tool 30 Swing plate 31 Motor 32 Eccentric cam

Claims (2)

[Claims] 1. An auxiliary plate capable of laterally mounting a work surface of a work piece and adjusting the position of the work piece toward a work tool; and an auxiliary plate along the work surface of the work piece. An arm that can move horizontally about the main axis and a processing tool that is detachably attached to the tip of the arm and that is given a predetermined rotation during processing, and is supported on the auxiliary plate. A curved surface grinding machine characterized in that the machined surface of the machined object is machined by a machine tool supported at the end of the arm. 2. An auxiliary plate capable of laterally mounting a work surface of a work piece and adjusting the position of the work piece to a work tool side; and an auxiliary plate along the work surface of the work piece. Arm that can move horizontally around the main axis, a swing plate that moves in the same direction as the arm, and is given a vibration during the movement, and is detachably attached to the tip of the swing plate. A processing tool attached to the processing plate, which is provided with a predetermined rotation at the time of processing, and the processing surface of the workpiece supported on the auxiliary plate is processed by the processing tool supported at the end of the oscillating plate. Curved surface grinding machine.