JPS6348379Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to an improvement of a two-axis rotary type curved surface polishing device in which a grinding wheel is rotated about two mutually orthogonal horizontal axes.

For example, when finishing a free-form surface such as a mold cavity for plastic molding, it was performed using a ball end mill with a spherical tip or a grindstone with a shaft, but the grinding speed varied depending on the angle of inclination of the finished surface, and especially when the angle of inclination was
At the 0° position, the speed becomes 0 and there is a drawback that uniform finishing cannot be achieved. To overcome this,
A so-called two-axis rotation type polishing device has been developed in which a grinding wheel whose grinding surface has a partially spherical shape is rotated about two axes, a horizontal axis and a vertical axis. In conventional devices, a planetary bevel gear is fixed to one end of a horizontal shaft that is perpendicular to the main shaft and rotates with the rotation of the main shaft via a bevel gear, and a bevel gear serving as an idler is rotatably provided at the other end. However, since the bearing to which the bevel gear at the other end is mounted handles rotation in two directions: revolution and rotation, it suffers from severe wear and breaks down more quickly than other members.

The purpose of the present invention is to solve the above-mentioned problems of the prior art.Therefore, the purpose of the present invention is to solve the problem of wear of the supporting bearing of the bevel gear as an idler on the horizontal shaft, and to improve the service life of the two-shaft rotation. It is an object of the present invention to provide a curved surface polishing device of the type.

The feature of the present invention is that a bevel gear is not used as an idler on the horizontal shaft as an intermediate shaft installed on the main shaft, but a balance weight is installed instead, thereby solving the problem of bearing wear.

Next, embodiments of the present invention will be described with reference to the drawings. Fig. 1 shows a two-axis rotary curved surface polishing device to which the present invention relates, and this type of device has a main shaft 1 rotated by a suitable drive device such as a motor, and a main shaft 1 that is rotatable. A support 2 to support, a first bevel gear 3 as a sun gear fixed to the support 2 with the main shaft 1 as the center, a horizontal shaft 4 passing through the main shaft and supported by a bearing, fixed to one end of the horizontal shaft. A second bevel gear 5 as a planetary gear, a grinding wheel 7 attached to a support shaft 6 provided perpendicular to the tip of the main shaft, and a transmission device 8 provided between the support shaft 6 and the horizontal shaft 4. configured. In the conventional structure, as shown in FIG. 1, the bevel gear 9 as an idler was provided by a bearing at the other end of the horizontal shaft for balancing the bevel gear 5, and therefore had the above-mentioned drawbacks.

In this curved surface polishing device, as the main shaft 1 rotates, the bevel gear 5 revolves along the bevel gear 3 and simultaneously rotates, so the horizontal shaft 4 also rotates.
The rotation of the grinding wheel 7 is transmitted to the support shaft 6 through the transmission device 8, and the grinding wheel 7 is rotated around the support shaft 6. The grinding wheel 7 is simultaneously rotated around the main shaft 1,
Therefore, since the grinding wheel undergoes a synthetic motion, the change in grinding speed due to the angular position of the grinding wheel is small, and since the grinding wheel alternately grinds in opposite directions every half rotation of the main shaft 1, an excellent finish can be obtained. .

This invention uses the rotation of the main shaft 1 to rotate the support shaft 6 of the grinding wheel.
This invention relates to the balancing of the horizontal shaft 4 as an intermediate shaft for rotating, and the feature of the present invention is that a weight 10 is installed at the end of the horizontal shaft 4 opposite to the bevel gear 5, as shown in FIG. That's what I did. In the figure, reference numeral 11 denotes a fixture for attaching the weight to the end of the horizontal shaft 4. This weight 10 is for balancing the weight of the bevel gear 5 attached to the horizontal shaft 4 and the thrust caused by centrifugal force.

Therefore, the weight 10 has approximately the same weight as the bevel gear 5. Further, the shape of the weight 10 can be any shape as long as it does not come into contact with the bevel gear 3 as a sun gear, but as shown in FIG.
It is preferable that 2 has a frustum shape because it can be made compact.

In addition, as mentioned above, the horizontal shaft 4 has a bevel gear 5 at one end.
However, since a weight 10 is provided at the other end and therefore receives thrust, the horizontal axis 4 is
is preferably supported by a pair of thrust bearings 13 and 14 such as angular bearings, and if desired, an auxiliary bearing 15 is installed between the member of the transmission device 8 and the weight 10.

During operation, as described above, the rotation of the main shaft 1 causes the grinding wheel 7 to rotate around the main shaft 1 and the support shaft 6 via the horizontal shaft 4, thereby polishing a curved surface. At that time, the horizontal axis 4
is rotated around the main shaft 1 and also rotates around its own axis due to the meshing of the bevel gear 3 and the bevel gear 5, but the balance is maintained with respect to the bevel gear 5 by the weight 10. , centrifugal force does not generate unstable force, and the polishing operation is performed with stable behavior.

Therefore, according to the present invention, since a bevel gear is not used as an idler for the planetary gear, a bearing for supporting the idler is not required.
The wear problem of the bearing is solved. By removing the problematic parts that are subject to extreme wear in this way, the performance becomes stable and the life of this type of grinding device can be improved.

[Brief explanation of the drawing]

FIG. 1 is a schematic elevational view of a conventional two-axis rotary curved surface polishing apparatus, and FIG. 2 is an elevational view, partially in section, of an embodiment of the present invention. In the figure, 1... main shaft, 3... sun bevel gear, 4...
... Horizontal axis, 5 ... Planetary bevel gear, 7 ... Grinding wheel, 8
...Transmission device, 10... Weight, 12... Weight through hole.

Claims (1)

[Claims for Utility Model Registration] (1) A rotationally driven main shaft and a planetary bevel gear that is rotatably supported through the main shaft and fixed to one end mesh with the sun bevel gear, thereby causing the main shaft to rotate. and a grinding wheel that is located at the tip of the main shaft and is rotated by the rotation of the horizontal shaft via a transmission device and whose grinding surface has a partial spherical shape, A curved surface polishing device characterized in that a weight for balance is installed at the opposite end of the bevel gear. (2) The curved surface polishing device according to claim 1, wherein the weight has a frustum shape with a through hole in the center for receiving the end of the horizontal shaft.