JPH09239667A - Polishing tool - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide the polishing tool which can polish a work piece without collapsing the shape of its part whose curvature is large. SOLUTION: A flange 21 is formed for the shaft 21 of the polishing tool 17 in a specified place upward from the tip end 21b of the aforesaid tool along the outer circumferential direction. A rubber pad 22 is mounted to the tip end part 21b of the shaft 21. The tip end face of the shaft 21 is brought into a condition that it is separated from the bottom face 22a of the rubber pad 22 when the rubber pad 22 is mounted thereon, and a hollow part 25 is thereby formed, which is enclosed by the tip end face 21c of the shaft 21, the bottom face 22a of the rubber pad 22 and an inner circumferential surface.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a polishing tool used for polishing a curved surface portion.

[0002]

2. Description of the Related Art Conventionally, a mold used for an automobile or the like is subjected to a finishing process for polishing its surface, and a polishing tool 51 as shown in FIG. 4 is used for the finishing process. A rubber pad 53 having a predetermined hardness (for example, Shore hardness of CR70 to CR90) is fixed to the tip of the shaft 52 of the polishing tool 51, and a sheet-shaped grindstone 54 is bonded and fixed to the bottom surface of the rubber pad 53. .

The polishing tool 51 is rotatably driven by a spindle motor provided on a polishing robot (not shown). As shown in FIG.
The polishing robot controls the axial center C1 of the polishing tool 51 so as to be parallel to the direction perpendicular to the surface of the portion 55a having a small curvature of the die 55 for polishing.
Is pressed against the surface of the portion 55a to polish the surface.

[0004]

However, FIG.
As shown in (b), when it is attempted to polish the surface of the portion 55b having a large curvature by using the polishing tool 51, the rubber pad 53 does not bend so much and does not fit the shape of the portion 55b having a large curvature. As a result, the surface of the portion 55b is ground more than the finished product, which causes a problem that the shape of the die 55 is destroyed.

An object of the present invention is to provide a polishing tool capable of polishing without breaking the shape of a portion having a large curvature.

[0006]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, a first aspect of the present invention is directed to a shaft which is driven to rotate along an axis, and is formed in a cylindrical shape with a bottom. A rubber pad attached to the, and a grindstone attached to the lower surface of the rubber pad, the grindstone is a polishing tool that is pressed against the surface of the workpiece to polish the surface, the tip surface of the shaft and The gist is that the rubber pad is adhered to the tip of the shaft so as to be separated from the bottom surface of the rubber pad.

The invention described in claim 2 is the same as claim 1
In the polishing tool according to the above item 1, a flange is formed at a predetermined position from the tip of the shaft, and a bottom surface of the rubber pad is formed deeper than a length from the tip of the shaft to the flange.

Therefore, according to the invention of claim 1,
Since the bottom surface of the rubber pad is separated from the tip end surface of the shaft, the rubber pad bends according to the shape of the work. According to the second aspect of the present invention, the tip end surface of the shaft and the bottom surface of the rubber pad are separated from each other by inserting the shaft into the rubber pad until it abuts on the flange.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to FIGS. FIG. 3 is a schematic perspective view showing the configuration of the polishing robot system 11. The polishing robot system 11 includes a polishing robot 12, a controller 13, a CAM device 14, and a surface plate 15. The CAM device 14 is used to create a program for driving and controlling the polishing robot 12,
The created program is transmitted to the controller 13.

A spindle motor 16 is provided in the polishing robot 12, and a polishing tool 17 is attached to the motor 16. Based on the program received from the CAM device 14, the controller 13 uses the spindle motor 16
Is driven to rotate the polishing tool 17. Further, the controller 13 controls each axis of the polishing robot 12 so that the rotation axis of the polishing tool 17 is fixed to the die 18 fixed on the surface plate 15 with respect to the perpendicular direction of the machining surface of the die 18. Control to be parallel. Then, the controller 13 presses the polishing tool 17 against the processing surface of the die 18 to polish the die 18.

As shown in FIG. 1, the polishing tool 17 comprises a shaft 21, a rubber pad 22, and a grindstone 23. The shaft 21 is formed in a substantially cylindrical shape, and its base end portion (upper portion in FIG. 1) 21 a is formed in a size attachable to the spindle motor 16. Also,
The shaft 21 has a tip portion (lower portion in FIG. 1) 21b.
A flange 24 is formed at a predetermined position in the upward direction from the outer peripheral direction. A rubber pad 22 is attached to the tip 21b of the shaft 21.

The rubber pad 22 is formed in a cylindrical shape having a bottom. The inner diameter of the rubber pad 22 is the tip 2 of the shaft 21.
It is formed to have substantially the same outer diameter as 1b. The depth of the bottom surface 22a of the rubber pad 22, that is, the length from the top surface 22b to the bottom surface 22a is determined by the tip surface 21 of the shaft 21.
It is formed to be longer than the length from c to the flange 24.

The tip portion 21b of the shaft 21 is
The flange 24 is inserted and adhered until it comes into contact with the upper end of the rubber pad 22. At this time, the bottom surface 22 of the rubber pad 22
The length a is formed deeper than the length from the front end surface 21c of the shaft 21 to the flange 24. Therefore, in the shaft 21, the tip end surface 21 c is the bottom surface 2 of the rubber pad 22.
In the state of being separated from 2a, a hollow portion 25 surrounded by the tip end surface 21c of the shaft 21, the bottom surface 22a of the rubber pad 22 and the inner peripheral surface is formed.

On the lower surface 22c of the rubber pad 22, the grindstone 2
3 are adhered. The grindstone 23 is a grindstone formed in a circular sheet shape, and is made of, for example, diamond cloth,
It is well adapted to a machined surface with a large curvature.

Then, the controller 13 controls the shaft 2
Each axis is controlled so that the first axis C2 is parallel to the surface perpendicular direction of the processing surface of the mold 18. In addition, the controller 13
The spindle motor 16 is driven to rotate the polishing tool 17, and the polishing tool 17 is pressed against the processing surface of the die 18.

At this time, as shown in FIG. 2, the rubber pad 2
Since the hollow portion 25 is formed between the end surface 21c of the shaft 21 and the shaft 2, the pressing portion 2 bends in accordance with the shape of the straight surface portion of the machining surface of the die 18 having a large curvature due to the pressing force. Therefore, the rubber pad 22 and the grindstone 23 are
Since it conforms well to the shape of the processed surface, it can be polished without breaking the shape.

In this embodiment, the rubber pad 22 has a Shore hardness of CR50. Therefore, the rubber pad 53 having the conventional Shore hardness of CR70 to 90 is used.
Softer than. Therefore, by softening the rubber pad 22 in addition to forming the hollow portion 25, the rubber pad 22 can be made to fit well into the shape of the processed surface having a large curvature.

As described above, in the present embodiment,
The following effects are obtained. (1) Attach the rubber pad 22 to the tip surface 21c of the shaft 21.
Since the hollow portion 25 is provided so as to be separated from the bottom surface 22a, the rubber pad 22 bends according to the shape of the mold 18 at the surface straight portion of the processing surface of the mold 18 by the hollow portion 25.
As a result, the rubber pad 22 and the grindstone 23 can be made to fit well on the processed surface having a large curvature.
It is possible to prevent excessive polishing of the processed surface of
It is possible to prevent the shape of the mold 18 from collapsing.

(2) Shore hardness CR5 on the rubber pad 22
Since the one having the diameter of 0 is used, in addition to forming the hollow portion 25, the rubber pad 22 can be well adapted to the shape of the processed surface having a large curvature.

The present invention may be carried out as follows in addition to the above embodiment. (1) In the above embodiment, the bottom surface 22 of the rubber pad 22
Although a is made deeper than the length from the tip surface 21c of the shaft 21 to the flange 24, the hollow portion 25 is formed between the bottom surface 22a and the tip surface 21c.
Is formed to have a depth substantially equal to the length from the tip surface 21c to the flange 24, and the upper surface 22b of the rubber pad 22 is attached to the flange 2
4 is attached so as to be separated from the bottom surface 22a and the tip surface 21.
The hollow portion 25 may be formed by separating it from c.

(2) In the above embodiment, the Shore hardness C
Although the rubber pad 22 of R50 is used, a rubber pad having the same Shore hardness CR70 to CR90 as the conventional rubber pad 53 may be used. In this case, although the bending is less than that in the above-described embodiment, it is possible to make it more compatible with the processed surface having a larger curvature than the conventional polishing tool 51.

(3) In the above embodiment, the polishing tool 17 is used.
Although the surface of the mold 18 is polished by the above, the surface of the molded product made of metal, resin, or the like other than the mold 18 may be polished by the polishing tool 17, for example.

[0023]

As described above in detail, according to the present invention, it is possible to provide a polishing tool capable of polishing without breaking the shape of a portion having a large curvature.

[Brief description of drawings]

FIG. 1 is a cross-sectional view of a polishing tool according to an embodiment.

FIG. 2 is a partial cross-sectional view showing a usage state of a polishing tool.

FIG. 3 is a schematic perspective view of a polishing system according to an embodiment.

FIG. 4 is a sectional view of a conventional polishing tool.

5A is a partial sectional view showing polishing of a portion having a small curvature, and FIG. 5B is a partial sectional view showing polishing of a portion having a large curvature.

[Explanation of symbols]

17 ... Polishing tool, 21 ... Shaft, 21c ... Tip surface, 2
2 ... Rubber pad, 22a ... Bottom surface, 23 ... Grinding stone, 25 ... Hollow part

Claims (2)

[Claims] 1. A shaft driven to rotate along an axis,
It consists of a rubber pad attached to the tip of the shaft and a whetstone attached to the lower surface of the rubber pad, which is formed in a cylindrical shape with a bottom, and the whetstone is pressed against the surface of the workpiece to polish its surface. A polishing tool for adhering a rubber pad to the tip of the shaft so that the tip surface of the shaft and the bottom surface of the rubber pad are separated from each other. 2. The polishing tool according to claim 1, wherein a flange is formed at a predetermined position from the tip of the shaft, and the bottom surface of the rubber pad is deeper than the length from the tip of the shaft to the flange. The formed polishing tool.