JPH0413090B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method and apparatus for polishing an object having a spherical polishing surface.

FIG. 1 shows a side view of a conventional polishing apparatus for spherical objects, and FIG. 2 shows a front view of the same.

A sliding table 2 is provided on the machine body 1,
A support 3 is fixed to this sliding table 2.

The tilting table 4 is attached to the support shaft 1 with respect to the above-mentioned support 3.
It is rotatably supported by 6. Reference numeral 13 denotes a motor for rotating the tilting table 4 around the support shaft 16.

A motor 5 is mounted on the tilting table 4 via a bracket 6, and the turntable 7 is driven to rotate by the motor 5. The object to be polished 8 is mounted on the turntable 7.

The polishing head 10 is connected to the main body 1 by a hydraulic cylinder 9.
The polishing tool 11 is supported so that it can be driven up and down relative to the workpiece 8, and is rotated or vibrated by pressing the polishing tool 11 against the object to be polished 8. In this condition, turntable 7
Polishing is performed by feeding the sliding table 2 while rotating it. At this time, while the displacement detector 12 detects the displacement of the polishing tool 11, the entire polishing head 10 is controlled by the hydraulic cylinder 9 so that the load applied to the polishing surface is constant. Keep the axis of the polishing tool 11 vertical
Polishing is performed while controlling the attitude of the object to be polished 8 by operating the tilting table motor 13 through NC control or adaptive control.

In order to further improve polishing accuracy, polishing head 1
A swing motor 14 is installed above the polishing head 10, and a swinging reciprocating arrow V having a constant amplitude in a horizontal plane is applied to the polishing head 10 via a connecting rod 15.

When a spherical object is polished using the conventional polishing apparatus and polishing method described above, the end of the polishing tool 11 is polished by applying the swing V in the horizontal plane to the polishing head 10 as described above. There is a problem in that it causes scratches on the surface.

The present invention has been made in view of the above-mentioned circumstances, and it is an object of the present invention to provide a method of polishing a spherical object and a polishing apparatus that can perform highly accurate polishing without causing scratches on the polished surface.

In order to achieve the above object, the polishing method of the present invention includes rotating an object to be polished having a spherical polishing surface and sliding it on a polishing tool, and maintaining the axis of the polishing tool perpendicular to the polishing surface. In a polishing method for a spherical object in which the object to be polished is rotated along a spherical surface so as to polish the entire area of the polishing surface while controlling the object to sag, The object to be polished is oscillated along the spherical surface with an amplitude smaller than the rotation of the object.

FIG. 3 shows an embodiment of a polishing apparatus for a spherical object according to the present invention configured to carry out the above-described method of the invention. The apparatus of this embodiment is an improved version of the conventional polishing apparatus shown in FIGS. 1 and 2 by applying the apparatus of the present invention, and the same drawing reference numbers in FIGS. 1 and 2 are used. The attached bracket 6, turntable 7, polishing head 10, and polishing tool 11 are the same or similar components as in the conventional apparatus, and the tilting table 4' to which the bracket 6 is attached in this embodiment is different from the tilting table 4' in the conventional apparatus. This is a member corresponding to the table 4.

The apparatus of the present invention includes a rotating turntable with an object to be polished mounted on the tilting table, the tilting table being supported so as to be rotatable around the shaft, and the tilting table being rotated around the shaft. In an apparatus for polishing a spherical object that is provided with a drive means for rotating the object, the rotation drive means tilts and rotates the tilting table with a stroke necessary to bring the entire area of the polishing surface into sliding contact with the polishing tool. The present invention is characterized in that the tilting table is configured to swing at a faster period and smaller amplitude than the tilting rotation described above.

Details of the polishing apparatus (FIG. 3) of this embodiment will be described below.

The shaft 19 is rotatably supported by the support column 20 via a bearing 21 around an axis X-X'.

An arm 32 is fixed to the shaft 19, and a tilting table 4' is attached to the arm 32 via adjustment means A, which will be described later. As a result, the tilting table 4' can be rotated in a pendulum-like manner about a constant central axis X-X', and the surface of the tilting table 4' is tilted as a result of the above-mentioned rotation.

A turntable 7 is supported on the above-mentioned inclined table 4' via a bracket 6, and a workpiece 8 to be polished is attached to the turntable 7.

Reference numeral B denotes a rotation drive means provided at one end of the shaft 19, which rotates the shaft 19. The rotation of the shaft 19 causes the tilting table 4' to move toward the shaft 1.
It can be tilted around 9. FIG. 4 is a side view of the rotation drive means B as seen in the direction of arrow C.

A tilting arm 22 is rotatably supported on the shaft 19. 23 is a bearing for support. A partial gear 24 is fixed to the end of the shaft 19, and a partial gear 28 is fixed to the tilting arm 22.

A tilting motor 29 is fixed to a fixed part of the device via a bracket 35, and a pinion 34 fixed to the shaft of the motor 29 is connected to the partial gear 28.
mesh with.

A swing motor 26 is fixed to the tilt arm 22 via a bracket 27, and a pinion 25 fixed to the shaft of the motor 26 is connected to the partial gear 24.
mesh with.

As a result, when the tilting motor 29 is rotated while the swinging motor 26 is stopped, the tilting arm 22 rotates together with the shaft 19. Further, when the swinging motor 26 is rotated back and forth with the tilting motor 29 stopped, the tilting arm 32 repeatedly swings together with the shaft 19 around the shaft 19.

Therefore, when both the tilting motor 29 and the swinging motor 26 are operated as described above, the tilting arm 32 performs a combined rotation and swinging motion about the shaft 19. Accordingly, the tilting table 4' attached to the tilting arm 32, the turntable 7 mounted thereon, and the object to be polished 8 attached thereto rotate in a complex manner around the shaft 19. . The state is shown in FIG.

FIG. 5 shows a state in which the object to be polished 8 on the turntable 7 is rotated while the polishing surface is in sliding contact with the polishing tool 11 of the polishing head 10, and 8a is the central axis of the spherical polishing surface. When the object to be polished 8 is tilted and rotated by the tilt angle θ together with the turntable 7 as described above, the central axis 8a is tilted to the position 8a' as shown in the figure, so that the polishing tool 11 slides into the area of radius R. and polish the polished surface.

Since the object to be polished 8 is attached to the turntable 7 and rotated around the axis of the turntable, the entire area within the area of the aforementioned radius R comes into sliding contact with the polishing tool 11 and undergoes the polishing process.

In this state, when the tilting table is further oscillated as described above, the center line 8a' of the polishing surface is oscillated at a oscillation angle of 2α (half amplitude α), and the object 8 to be polished is shown by the solid line. Position 36 shown by a broken line centering on standard position 37 in case of inclination angle θ is the same as 3.
It oscillates between 8 and 8.

The above-mentioned tilting through the angle θ and swinging through the angle α are performed around the shaft 19. Therefore, it is necessary to align the center of curvature of the spherical polishing surface of the object to be polished 8 with the axis X-X' of the shaft 19. For this reason, the adjusting device A shown in FIG. 3 fixes the handle 33 to the screw 31 rotatably supported in parallel with the arm 32, and screws the nut 30.
Fix this nut 30 to the inclined table 4',
The structure is such that the distance between the polishing surface of the object to be polished 8 and the shaft 19 can be freely and manually adjusted.

In the apparatus of this embodiment, as described above, the rotating turntable 7 with the object 8 attached thereto is mounted on the tilting table 4', and the tilting table 4' is rotated about the shaft 19. The tilting table is supported on the shaft 19.
A driving means B is provided for rotation around the . The driving means B has an angle θ in order to bring the entire area of the polishing surface (area of radius R) into sliding contact with the polishing tool 11.
A means (partial gear 28, pinion 34, tilting motor 29) is provided for rotating the tilting table 4' within the tilting range of Means for rocking (partial gear 24, pinion 2
5. A swing motor 26) is provided. When the present invention is actually applied, the period and amplitude of the means for driving the rotation and rocking may be configured to be possible or constant; in short, the tilting table 4' The drive device may be configured so that it can simultaneously perform two types of rotations with different periods and amplitudes.

To polish the spherical surface of the workpiece 8 using the above-mentioned device, the tilting motor 29 is operated to tilt the tilting table 4' by an angle θ, and at the same time, the swinging motor 26 is operated. The tilting table 4' is caused to swing at an amplitude angle α. Due to the combination of both of the above operations, the angle of inclination of the tilting table 4', the turntable 7 mounted thereon, and the object to be polished 8 changes as shown in FIG. In this chart, the vertical axis is the inclination angle of the object to be polished, and the horizontal axis is the time axis, as well as the distance between the polishing tool and the center of the surface to be polished.
It represents the distance to the sliding contact point with 1.

In the polishing method of the present invention, as described above, the polishing tool 11 is rotated along the spherical surface of the object to be polished 8 so as to be brought into sliding contact with the entire area of the polishing surface, and the polishing tool 11 is rotated at a cycle faster than the rotation described above. Make it vibrate. Both of the above-mentioned rotations and swings are circular movements centered on the shaft 19, and this circular movement is combined with the rotation of the turntable 7 to move the object 8 to be polished relative to it (with respect to the polishing tool 11). Causes spherical motion. Therefore, there is no risk of scratches caused by the edges of the polishing tool.

In the above embodiments, the method and apparatus for polishing a concave spherical surface have been described, but the method and apparatus of the present invention can be applied to polish a convex spherical surface with high precision, as well as concave cylindrical surfaces and convex spherical surfaces. Various spherical surfaces to be polished, such as cylindrical surfaces, concave spheroidal surfaces, and convex spheroidal surfaces, can be polished with high precision, making it ideal for polishing various lenses, molds for lenses, and other spherical surfaces. The present invention can be widely applied to polishing various types of workpieces having shaped surfaces to be polished.

As detailed above, when the method of the present invention is applied, it is possible to polish a spherical object with high precision without the risk of scratching, and
When the apparatus of the present invention is applied, the above polishing method can be easily carried out and its effects can be fully exhibited.

[Brief explanation of drawings]

FIG. 1 is a side view of a conventional polishing device for spherical objects, FIG. 2 is a front view of the same, FIG. 3 is a front view of a polishing device for spherical objects of the present invention, and FIG. 4 is a side view of the same. FIG. 5 is an explanatory diagram of the tilting and swinging of the object to be polished in the above embodiment, and FIG. 6 is a chart showing the tilting and swinging of the object to be polished. 19...Shaft, 22...Tilt arm, 2
4, 28... partial gear, 25, 34... pinion, 26... rocking motor, 29... tilting motor.

Claims (1)

[Scope of Claims] 1. A polished object having a spherical polishing surface is brought into sliding contact with a polishing tool while being rotated, and the axis of the polishing tool is controlled to be kept perpendicular to the polishing surface, In a method of polishing a spherical object in which the object to be polished is rotated along a spherical surface so as to polish the entire area of the polishing surface, the polishing method is performed with a faster period than the above-mentioned rotation and with a smaller amplitude than the above-mentioned rotation. A method for polishing a spherical object, characterized by swinging the object to be polished along a spherical surface. 2. A turntable to which the object to be polished is attached and rotates is mounted on a tilting table, the tilting table is supported so as to be rotatable around an axis, and the tilting table is rotated around the shaft. In an apparatus for polishing a spherical object, which is provided with a drive means, the rotation drive means rotates the tilting table with a stroke necessary to bring the entire area of the polishing surface into sliding contact with the polishing tool, and 1. A polishing device for a spherical object, characterized in that the tilting table is configured to be able to swing at a faster period and with a smaller amplitude.