JPH0351553B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a spherical surface grinding device for optical components such as optical lenses and mirrors.

Construction of the conventional example and its problems As shown in Fig. 1, the concrete construction of the conventional spherical grinding device is such that the lens 3, which is held by the collector chuck 1 and is attached to the rotary spindle 2 and rotated at low speed, is attached to the tilted slide shaft. 4 is tilted at a predetermined angle of inclination, and is further attached to a high-speed rotation spindle 6 placed at a predetermined position by a parallel slide shaft 5, and subjected to spherical grinding by a diamond grindstone 7 rotating at high speed. In this case, the glass material is brought into the collection chuck 1 manually by an operator or brought in and held in an autoloader, and the same applies to removal after processing. In addition, the commonly used diamond whetstone is metal bond #
Approximately #100 to #400 is used, resulting in a finished surface roughness of R _nax 2 to 6μ. In the subsequent process, smoothing is performed using diamond metal bond pellets and resinoid bond pellets, and furthermore, in the subsequent process, polishing is performed using an abrasive such as CeO ₂ .

However, in the device as described above, the lens 3 held by the collect chuck 1 can only be ground with one diamond grindstone 7, and when finishing grinding this, the grindstone must be replaced or
Alternatively, it may be necessary to transfer the lens to another spherical surface machining device, but re-holding the lens in the collect chuck requires changing the holding posture of the lens and increasing the machining allowance for finish grinding. Therefore, rough grinding and finish grinding cannot be performed efficiently. In addition, it is not easy to use the forced cutting method in rough grinding, and the constant pressure cutting method in finish grinding, making it impossible to obtain a good finished surface and production in the same takt time. It had the disadvantage that it could not be used for

OBJECTS OF THE INVENTION The present invention solves the above-mentioned drawbacks and efficiently realizes a good polished surface.

Structure of the Invention The present invention includes a holder for holding a workpiece, a means for attaching the holder to a spindle and rotating it and feeding it in the axial direction, and a means for processing the workpiece into a predetermined spherical shape at a predetermined angle. and a machining tool arranged at an angle, the spindle and the machining tool each having one for rough machining and one for finishing machining,
The holder holding the workpiece is transferred to a rough machining spindle and a finishing spindle, and the workpiece is machined.

Therefore, a good ground surface can be efficiently achieved and the post-process can be simplified. Therefore, it is extremely advantageous in terms of precision maintenance and management and cost reduction.

DESCRIPTION OF EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings.

Figure 2 is a conceptual diagram showing the transfer of the workpiece.
The lens 9 on the conveyor 8 is attracted by the automatic hand 10 and conveyed in the direction a, and taken into and held by a chuck unit 12, which is a holder for fixing and holding the lens 9, at the workpiece transfer section. 11
1 is a holding part 11 which is a holder holding member that holds the chuck unit 12. This holding part 11 is
It is placed on the index table 13 and rotates in the 120°b direction, and the lens 9 is roughly ground and further
It rotates in the 120°c direction and is finished with precision grinding.
The lens 9 is rotated again by 120° in the d direction, and the lens 9 is removed from the chuck unit 12, taken out in the e direction, and placed on the conveyor 14. The above operations are performed one after another in the same takt time.

FIG. 3 shows a specific embodiment, a plan view of the spherical surface machining device, and FIG. 4 a front view thereof. In the figure,
15 is a diamond grindstone for rough machining, and metal bond #100 to #400 is used. 16 is a diamond grindstone for precision machining, and metal bond #800 to #1500 is used. 17 and 18 are rotating spindles of the grinding wheels 15 and 16, respectively, and 19 and 20 are drive motors thereof. 21 and 22 are whetstones 15 and 16
This is a slide drive motor that moves the grinding wheels 15 and 16 so that their outer peripheries touch the center of the lens 9. Further, the grindstones 15 and 16 are tilted at a predetermined inclination angle about shafts 23 and 24 by a drive motor (not shown) so that spherical surfaces with a predetermined radius of curvature can be ground. Reference numerals 25 and 26 denote rotary spindles provided under the index table 13, which clamp the chuck unit 12 holding the lens 9 conveyed by the clamping part 11 and rotate it at about 5 to 50 rpm. .
Further, the rotating spindles 25 and 26 are fed into the grindstones 15 and 16 by a feeding device (not shown). Reference numerals 29 and 30 are drive motors that rotate the rotary spindles 25 and 26. Rotating spindle 2
5 is for rough machining, and is forcibly fed into the diamond grindstone 15 to realize forced cutting type grinding. The rotating spindle 26 is used for precision machining, and is fed to the diamond grindstone 16 at a constant pressure to achieve constant pressure cutting method grinding.

10 attracts the lens 9 and attaches it to the chuck unit 1.
2, or an automatic hand that performs the operation of holding it in the chuck unit 12 or removing it from the chuck unit 12. 11
is a support section attached to the index table 13, which holds the check unit 12 therebetween. Further, 34 is the main body base.

In the spherical surface machining device configured as above,
The operation will be explained below.

First, the automatic hand 10 attracts the lens 9 on the conveyor 8, rotates in the direction a, and sets and holds the lens 9 in the chuck unit 12 of the workpiece transfer section. Next, check unit 12
is held by the holding part 11. Thereafter, the check unit 12 is held between the holding parts 11 and
The index table 13 rotates the index table 13 in the direction of 120 degrees f, positions it, releases it from the clamping part 11, and fixes it to the rotary spindle 25 at the same time. A diamond grindstone 15 arranged to grind the lens 9 to a desired radius of curvature is rotating at a high speed of 8000 to 1200 rpm. On the other hand, the lens 9 fixed to the end face of the rotating spindle 25 has a rotation speed of 5 to 50 rpm.
Since the lens 9 is fed into the grindstone 15 while rotating, the grindstone 15 forcibly cuts into the lens 9 to a fixed size and performs rough grinding. After processing, the chuck unit 12 is released from the rotary spindle 25, re-clipped by the clamping part 11, further rotated and positioned in the 120° f direction by the index table 13, and simultaneously released from the clamping part 11 and placed on the rotary spindle 26. Fixed.

A diamond grindstone 16 arranged to grind the lens 9 to a desired radius of curvature is rotating at a predetermined rotational speed. On the other hand, the lens 9 fixed to the end face of the spindle 26 has a rotation speed of 5 to 50 rpm.
Since the lens 9 is fed into the grindstone 16 while rotating, the grindstone 16 cuts into the lens 9 at a constant pressure to perform precision grinding. After processing, it is held again by the chuck holding part 11 in the same way and heated to 120°F again.
rotate in the direction and return to the original position. Thereafter, the lens 9, which has been finely ground as described above, is taken out from the chuck unit 12 by the automatic hand 10. The above-mentioned series of operations are performed continuously with the same takt time.

As described above, according to this embodiment, the takt time
R _nax after fine grinding finish in about 20-50 seconds
A thickness of about 0.2 μm can be easily obtained, and automation has become possible.

Effects of the Invention As described above, in the present invention, the workpiece is held by the holder and transferred to the rotary spindle for rough machining and the rotary spindle for finish machining, and the workpiece is rough-processed while being held by the holder. , finishing processing is performed.

That is, since the workpiece is held by the holder without changing its holding posture during processing, a good ground surface of the workpiece can be efficiently achieved in a short time.

[Brief explanation of drawings]

Fig. 1 is a plan view showing the specific configuration of a conventional spherical surface grinding device, Fig. 2 is a conceptual diagram showing the transfer of a workpiece in an embodiment of the present invention, and Fig. 3 is a plan view showing the specific configuration of a conventional spherical surface grinding device. The plan view shown in FIG. 4 is a front view of the same. 7,15,16...Diamond whetstone, 3,
9, 27... Workpiece (lens), 10, 31...
...Auto hand, 11,32...Chuck clamping hand, 12,28...Chuck unit, 6,1
7, 18... Grinding wheel rotation spindle, 2, 29, 3
0...Work rotation spindle.

Claims (1)

[Claims] 1. A holder that fixedly holds a workpiece supplied from the outside, a movable holder holding member that holds the holder, a rotating spindle that rotates after the holder is fixed to an end surface, and a rotating spindle that rotates after the holder is fixed to an end surface. It consists of a processing tool arranged at an angle at a predetermined angle in order to process a workpiece into a predetermined spherical shape, and a means for feeding the rotary spindle to the processing tool in the direction of the rotation axis of the processing tool, The spindle and the machining tool are provided in pairs facing each other for rough machining and finishing machining, and
A spherical surface machining device, wherein the holder clamping member moves between a workpiece delivery section, a spindle facing the rough machining tool, and a spindle facing the finishing machining tool.