JPS60191754A - Curved surface polishing device - Google Patents

Abstract

PURPOSE:To eliminate any position which is incapable of being polished and carry out a relatively uniform polishing operation by rotating a grind wheel centering around two shafts, a main shaft and a sub-shaft which is inclinedly provided with respect to said main shaft, in a curved surface polishing device which polishes the curved surface of a metal mold, etc. CONSTITUTION:A curved surface polishing device comprises a main shaft 1 rotated by a motor and a sub-shaft 2 which is inclinedly provided with respect to the main shaft 1, while a ball type grind wheel 3 with spindle is fixed to the end of the sub-shaft 2. The center O of the grind wheel 3 is on the center line of the main shaft 1. When the main shaft 1 rotates during operation, a supporting part 8 and the sub-shaft 2 which is supported on the part 8, rotate centering around the main shaft 1. Accordingly, a follower gear 11 on the rear end of the sub-shaft 2 revolves around the main shaft 1 while being meshed with a main gear 10, while, at the same time, it also rotates on its own axis, rotating the sub-shaft 2, the number of rotation of the sub-shaft 2 is inversely proportional to the ratio of the number of teeth of the follower gear 11 to the number of teeth of the main gear 10. Therefore, the grind wheel 3 carries out a polishing operation while making a swinging operation caused by the rotation centering around the two shafts.

Description

[Detailed description of the invention] J, ・'l intersection 11111-) r, L+n', /nJhl
The present invention relates to an improvement in a curved surface polishing device suitably used for polishing curved surfaces of molds, etc.

For example, the construction of free-form surfaces such as molds for plastic molding.
Conventionally, grinding has been done using a ball end mill with a spherical tip or a grindstone with a spherical shaft. The speed varies depending on the angle of inclination of the finished surface, so uniform finishing is not possible, especially at the position where the angle of inclination is 0 degrees.

That is, the circumferential speed becomes 0 at the center of the spindle, and there is a drawback that grinding cannot be performed at the tip of the grindstone at that position. Therefore, there are many constraints, especially when polishing free-form surfaces in mechanical grinding.

The purpose of the present invention is to solve the above-mentioned problems of the prior art, and therefore to eliminate positions that cannot be polished and to
It is an object of the present invention to provide a curved surface polishing device that can perform polishing work relatively evenly.

The curved surface polishing apparatus according to the present invention includes a rotationally driven main shaft and an auxiliary shaft tilted with respect to the main shaft and rotatably supported on the main shaft.
The auxiliary shaft is rotated and revolves around the main shaft, thereby giving an oscillating motion to the shaft (-J grindstone) fixed to the tip of the auxiliary shaft.

Next, embodiments of the present invention will be described with reference to the drawings. As shown in the figure, the polishing device according to the present invention includes a main shaft (1) rotationally driven by a motor, and an auxiliary shaft (2) provided at an angle with respect to the main shaft (1), and the tip of the auxiliary shaft (2). A spherical shaft (; J grindstone (3) is fixed to the

The center (0) of this grindstone (3) is located on the center line "2" of the main shaft (1).

1: The ill is rotatably installed on the support member (5) by a bearing (4). (6) is a retaining ring, and (7) is a cover plate that covers the bearing (4). Auxiliary shaft (2)
is the main axis (1).

Preferably, it is rotatably supported by a bearing (9) on a support portion (8) provided integrally at the tip of the main shaft (1).

This auxiliary shaft (2) is rotated by the rotation of the main shaft (1).

Therefore, the 1:, 1'11 wheel (lO) is fixed to the support member (5) concentrically with the main shaft (1), and the driven gear is fixed to the rear end of the auxiliary shaft (2) and meshes with the old main gear (10). Gear (11
)including. (12) is a retaining ring that fixes the gear (11), and t131 is a retaining ring that fixes the main gear (10).
). (14) is a holder,
The grindstone shaft (15) fitted into the hole in the lower part of the auxiliary shaft (2) is tightened and fixed. The main shaft (1) is the main 1''t
, 1: loosely passes through no+. Main gear (10
) serves as a sun float, and the driven gear (11) is a planetary gear in contrast to the main float (10). (16
) is the casing.

In the embodiment shown in FIG. 1, the main gear (10) is an external gear, but as shown in FIG.
0), and by using the internal gear in this way, the driven gear (11) is arranged inside the internal gear, which is advantageous in that it can be made even more compact.

During operation, when the main shaft (1) is rotated, the support part (8) and the auxiliary shaft (2) supported therein also rotate together with the main shaft (1). Therefore, the driven gear (11) at the rear end of the auxiliary shaft (2) revolves around the main shaft (1) while meshing with the main gear (10), and simultaneously rotates,
Rotate the auxiliary shaft (2). The rotational speed (rotation) of the auxiliary shaft is inversely proportional to the ratio of the number of teeth of the driven gear to the 1'lj number of the main gear. For example, if the ratio of the number of teeth is 25=1, the main axis fi
It becomes 25 times the rotation speed of l. Therefore, the grindstone (3) at the tip of the auxiliary shaft (2) rotates not only around the auxiliary shaft (2) but also around the main shaft (1). Therefore, the grindstone (3
) performs polishing work while performing rocking motion consisting of rotation around two axes. Therefore, the change in grinding speed due to the angular position of the grinding wheel is small. Also, a whetstone with a shaft (3)
Since the center of the grinding wheel (3) is on the center line of the main shaft (1), the contact point between the workpiece and the grinding wheel (3) does not fluctuate due to rocking, and the grinding work can be carried out suitably.

As described above, in the curved surface polishing apparatus according to the present invention.

Since the grindstone rotates around two axes: the main shaft and an auxiliary shaft installed at an angle to the main shaft, even if the axis of the main shaft is in two parts, only one working force is required per polishing, which is different from conventional polishing. There is no impossible position. and adding liquid] - 1, 1 (the part of the stone that comes into contact with the object is polished relatively uniformly, and further.

In this device, the rotation of the main shaft is transmitted to the grinding wheel shaft only by the meshing of a pair of gears, so the transmission system is extremely simple, and this type of device, which is subject to lateral vibration and complex loads, operates smoothly and has fewer failures. thing lrl 7” +)
1M1. T City/II Small Ho City Ito:lf' -1::
f-II+ +, so breakage of the grindstone is not so much of a problem, and it is possible to use an 11 smaller grindstone once a month, which has the advantage of being able to polish curved surfaces with large curvatures.

[Brief explanation of the drawing]

FIG. 1 is an elevational view of a curved surface polishing apparatus according to an example of the present invention with the casing removed, FIG. 2 is a vertical sectional view thereof, and FIG. 3 is a small vertical sectional view of another embodiment. . In the figure, 1. Main shaft, 2. Auxiliary shaft, 3. Grinding wheel with shaft. 5...Support member, 8...Support part, 10...Main 1゛41 wheel, 11. Driven gear Figure 1, Figure 314

Claims (1)

[Scope of Claims] (]) a rotationally driven main shaft, an auxiliary shaft tilted with respect to the main shaft and rotatably supported by the main shaft, and a spherical shaft fixed to the tip of the auxiliary shaft. 11. It is fixed to the supporting part H that rotatably supports the attached grindstone and the main shaft. tsu+i
A curved surface polishing device comprising: a main gear disposed concentrically with the main shaft; and a driven gear fixed to the rear end of the auxiliary shaft and meshing with the main gear. (2) The curved surface polishing apparatus Ivi° according to claim 1, wherein the auxiliary shaft is supported by a support part J'4j that is integrally provided at the tip of the main shaft. (3) The curved surface polishing device according to claim 1, wherein the upper gear is an external gear. (4) The curved surface polishing apparatus according to claim 1, wherein the main gear is an internal gear.