JP2548474Y2 - Polishing contact wheel - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a polishing contact wheel that rotates while holding and holding an endless polishing belt on the outer peripheral surface of a holding wheel.

[0002]

2. Description of the Related Art Conventionally, an endless polishing belt is wound between a polishing contact wheel (hereinafter abbreviated as a contact wheel) and an idler wheel, and the workpiece is polished by pressing a workpiece against the endless polishing belt on the contact wheel. Had been done. As a contact wheel, a retaining ring made of a rubber-like elastic body having an Hs (JIS A) hardness of about 55 to 90 is attached to an outer peripheral surface of a metal inner ring having a through-hole for connecting a rotary drive source, or One in which a retaining ring made of a sponge body is attached to an outer peripheral surface of an inner ring is known.

[0003]

However, in such a conventional contact wheel for polishing, for example, the former contact wheel becomes a relatively hard holding wheel and is similar to the surface of the workpiece. There is a problem that it is difficult to obtain a polished surface with a fine finish. If the rubber-like elastic body of the retaining ring is softened to cope with this, there has been a problem that the retaining ring is separated from the inner ring during high-speed rotation.

Further, the latter contact wheel has a problem that when it is rotated at a high speed, it is thermally deformed by the heat generated by the sponge body, so that the retaining wheel is peeled off or damaged from the inner ring. However, there is a problem that the sponge body is worn due to slippage between the endless polishing belt and the sponge body.

The present invention has been made in view of the above problems, and has as its object to provide a polishing contact wheel which has flexibility and can withstand high-speed rotation.

[0006]

SUMMARY OF THE INVENTION The present invention has been made to achieve the above-mentioned object, and is a polishing contact wheel which rotates while attaching and holding an endless polishing belt on an outer peripheral surface of a holding wheel. The contact wheel for polishing is characterized in that the retaining wheel is formed of foamed polyurethane in the range of Hs (JIS A) hardness of 25 to 45 and has a plurality of through holes formed in parallel with the axis. It is.

[0007]

The present invention is constructed as described above. In addition to the centrifugal expansion of the foamed polyurethane itself during rotation, the retaining ring assists the centrifugal expansion by deforming the through-hole. The endless polishing belt is pressed against the endless polishing belt to accurately hold the endless polishing belt.

[0008] When the workpiece is pressed against the rotating endless polishing belt, the pressing force deforms the through-hole, thereby supporting the softness of the polyurethane foam of the retaining ring, and moving the endless polishing belt to the workpiece. Make it supple and close to the surface.

Further, when the through-hole returns from the deformation due to the rotation of the retaining wheel, the returning force removes shavings attached to the endless polishing belt, and further suppresses heat generation of the retaining wheel by ventilation in the penetration.

[0010]

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

FIG. 1 is a front view of a polishing contact wheel of this embodiment, and FIG. 2 is a sectional view.

In the figure, a polishing contact wheel denoted by reference numeral 1 (hereinafter abbreviated as contact wheel 1).
Is composed of a metal inner ring 3 having a shaft through hole 5 and a holding ring 7 having a plurality of through holes 9 and fixed to the outer peripheral surface of the inner ring 3.

In the embodiment, the holding ring 7 is formed in an annular body having a hardness of Hs (JIS A) hardness 35, a width W of about 40 mm and a thickness T of about 45 mm by foamed polyurethane. 3 is adhered to the outer periphery. The Hs hardness of the retaining ring 7 is preferably in the range of 25 to 45. If the Hs hardness is less than 25, the bubbles become coarse and easily peel off from the inner ring 3 or breakage during high-speed rotation. Also,
If the Hs hardness exceeds 45, centrifugal expansion due to rotation is reduced, and flexibility is reduced.

The holding wheel 7 has a plurality of concentric circles (for example, 3
Six through-holes 9 (36 in total, 36 on the inner peripheral side) are formed. The through holes 9 are formed at equal angular intervals in the circumferential direction, and the outer peripheral side through hole 9 and the inner peripheral side through hole 9 are
It is drilled at a position shifted by 1/2 pitch. Further, a distance t1 between the most distal end portion of the through hole 9 on the outer peripheral side and the outer periphery of the holding wheel 7.
Is within about 1/2 of the diameter of the through hole 9 (for example,
Is less than 5 mm when the diameter of the
The closest distance t between the outer peripheral side through hole 9 and the inner peripheral side through hole 9
2 is preferably set to be equal to or less than 1/2 of the diameter value of the through hole 9.

As shown in FIG. 3, the contact wheel 1 constructed as described above has a shaft through hole 5 connected to a rotary drive source, and an idler wheel 1 provided at an opposite position.
1, the endless polishing belt 10 having a width substantially equal to the width W of the holding wheel 7 is stretched to rotate the contact wheel 1 at a high speed. At this time, the holding wheel 7
Expands in the centrifugal direction as a whole and presses against the endless polishing belt 10, and the endless polishing belt 10 is driven to rotate along with the contact wheel 1.

When the retaining ring 7 is centrifugally expanded, the through-holes 9 are deformed to assist the expansion of the retaining ring 7 due to the hardness of the polyurethane foam, and the retaining ring 7 and the endless polishing belt 10 are brought into pressure contact with each other. Slip between the two is prevented, and wear of the retaining wheel 7 due to the slip is prevented.

The workpiece 15 is an endless polishing belt 1.
When pressed to zero, the pressing force deforms the through-hole 9 together with the elastic deformation of the retaining ring 7 to support the softness of the foamed polyurethane, and to make the endless polishing belt 10 supple on the surface of the workpiece 15. Adhere.

As the polishing of the workpiece 15 progresses, the shavings attached to the surface of the endless polishing belt 10 are removed when the holding ring 7 rotates and the one through hole 9 is separated from the pressing area of the non-working workpiece 15. The through holes 9 are repelled and scattered by the resilience of returning to the original shape, thereby preventing the endless polishing belt 10 from being clogged. In addition, the rotation of the contact wheel 1 allows air to flow into the through hole 9 to suppress heat generation of the holding wheel 7.

Further, the diameter (inner diameter for mounting) of the endless polishing belt is formed to be slightly larger than the outer shape of the holding wheel 7, and the endless polishing belt is attached to the holding wheel 7 of the contact wheel 1 connected to the rotary drive source. It may be fitted and mounted. In this case, the contact wheel 1 rotates the endless polishing belt uniaxially, and the retaining wheel 7 expands in the centrifugal direction due to the centrifugal force of high-speed rotation, and the entire outer peripheral surface thereof comes into pressure contact with the endless polishing belt, and the endless polishing is performed. The belt is properly rotated and driven.

It should be noted that the present invention is not limited to the above description and examples of the drawings, and the embodiments thereof can be modified without departing from the technical idea of the present invention. For example, the through-hole may be formed on one concentric circle or three or more concentric circles. Further, the through hole may be a square hole or an elliptical hole.

[0021]

As has been described above devised], according to the polishing contact wheel of the present invention, the holding ring is formed by foamed polyurethane, the hardness H _S (JIS) Hardness 25
45, and a plurality of through holes are provided, so that the through holes are deformed during rotation to support the centrifugal expansion of the holding wheel, and the holding wheel and the endless polishing belt are pressed into contact with each other. Slippage can be prevented, and the endless polishing belt can be held accurately.

Further, when the workpiece is polished, the through-hole is deformed by the pressing force of the workpiece, thereby supporting the softness of the material of the retaining ring, and allowing the endless polishing belt to be supposedly formed on the surface of the workpiece. It can be close. Therefore, it is possible to cope with the polishing of the workpiece which requires extremely fine finishing.

Further, at the time of polishing, the revolving force of the through-holes separated from the pressing area of the workpiece by the rotation of the holding ring and returning to the original shape causes the shavings adhered to the surface of the endless polishing belt to be scattered, whereby the endless polishing belt Clogging can be prevented. In addition, since the air can be ventilated into the through hole during rotation, the effect of suppressing the heat generation of the retaining wheel and increasing the durability of the retaining wheel is achieved.

[Brief description of the drawings]

FIG. 1 is a front view of a polishing contact wheel according to an embodiment of the present invention.

FIG. 2 is a sectional view taken along line AA of FIG. 1;

FIG. 3 is a front view showing a state where an endless polishing belt is attached.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Polishing contact wheel 7 Retaining ring 9 Through hole

Continuation of the front page (56) References JP-A-4-30963 (JP, A) JP-A-2-109675 (JP, A) JP-A-55-70552 (JP, A) JP-A-55-37292 (JP, A) , A)

Claims (1)

(57) [Scope of request for utility model registration] 1. A polishing contact wheel that rotates while holding and holding an endless polishing belt on an outer peripheral surface of a holding wheel, wherein the holding wheel is made of Hs (JIS) by foamed polyurethane.
A) A contact wheel for polishing characterized by having a plurality of through-holes formed in a hardness range of 25 to 45 and formed in parallel with an axis.