JP2000210875A - Rotary grinder - Google Patents

Abstract

PROBLEM TO BE SOLVED: To eliminate the unevenness of the height and the hardness of a grinding surface generated at the inner periphery and the outer periphery of an abrasive body layer, in a rotary grinder using a plate piece form of abrasive plate pieces as the composing elements on the abrasive body layer. SOLUTION: In a rotary grinder in which a rotary board 3, and abrasive body layers 2 formed along the peripheral part of on the board 3, are provided, and the abrasive body layers 2 are composed of numerous retangular abrasive plate pieces 1 which are laid to surround the peripheral part of the board 3, in an inclined laminating condition, the abrasive plate pieces 1 are made by a rectangle as the basic form, they are adhered and fixed to the rotary base board surface at the lower end side, and the upper end side is cut obliquely in order to make the cutting width the smaller gradually, from the inner peripheral side to the outer peripheral side.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rotary polishing tool, and more particularly to a rotary polishing tool in which a polishing body layer is formed by stacking a large number of plate-like polishing plate pieces in an inclined manner.

[0002]

2. Description of the Related Art It is known, for example, from Japanese Patent Application Laid-Open No. 50-85885, that in a rotary polishing tool, a polishing body layer is constituted by an inclined stack of a large number of polishing plate pieces. In this known rotary polishing tool, a large number of rectangular polishing plate pieces are laid in an obliquely stacked state so as to go around the peripheral portion of the rotating substrate, and the polishing plate piece has a lower end side to the rotating substrate surface. The adhesive fixing portion and the upper end side constitute the polishing surface in the surface of the polishing body layer.

[0003]

According to the rotary polishing tool having the above-mentioned structure, on the polishing surface side of the surface of the polishing body layer, as the upper end side of the polishing plate piece wears down, the lower polishing plate piece portion becomes smaller. Since it appears as a new polishing surface one after another, it can be used continuously for a long time.

FIGS. 5 to 7 show an example of a conventional rotary polishing tool of this kind. FIG. 5 shows a state in which rectangular polishing plate pieces a are being stacked in an inclined manner, and FIG. FIG. 7 shows the cross-sectional shape of the polishing body layer b on the radius line l of the rotating substrate c.
As apparent from FIG. 7, the polishing surface b ₁ of the abrasive layer b is inclined from the inner circumference side gradient down toward the outer circumferential side. 8 is an explanatory view of the principle of the ramp generator of the polishing surface b _1, in the drawing,
W indicates an installation width W required for inclined installation of one polishing plate piece a on the circumference of the polishing body layer b. For example, when the polishing body layer b is formed from 72 polishing plate pieces a, Circumference length L
(Represented by a straight line for convenience) is equivalent to 72 times the installation width W, and the slopingly mounted polishing plate pieces a are in close surface contact with each other on the inner peripheral end side. However, since the circumference length gradually increases toward the outer periphery of the polishing body layer b, the polishing plate piece a
When the inclined installation angle θ is set to be constant from the inner peripheral end to the outer peripheral end, a larger gap is generated at the outer peripheral end between the inclined stacked polishing plate pieces a, and the stacking density is increased. Large variations occur, which cannot be put to practical use. Conventionally, in order to solve such a problem, a twist is forcibly given to the polishing plate piece a so that the inclination installation angle θ gradually decreases toward the outer peripheral end, and the polishing plate piece a,
The gap generated between a is eliminated. If you do this,
It is possible to eliminate the overlap density and the hardness difference between the inner and outer circumferences of the polishing body layer b to some extent. However, when the inclination setting angle θ of the polishing plate piece a becomes smaller toward the outer peripheral end, the thickness of the polishing body layer b becomes smaller toward the outer peripheral end, and the polishing surface b ₁
Appears as a slope.

[0005] As schematically shown in FIG. 9, the inclined installation angle θ of the polishing plate piece a which is inclined and installed in a twisted state is maximum on the inner peripheral end side (see the solid line), and is set on the outer peripheral end. Side (see the broken line), the maximum angle θ ₁ and the minimum angle θ ₂
The polishing plate piece a tends to recover toward the maximum angle θ ₁ due to its elasticity. Due to this inclination restoring tendency, the overlapping density of the polishing plate pieces a is maintained substantially as set on the inner peripheral end side, but a gap tends to be generated between the polishing plate pieces a on the outer peripheral end side. It appears as an overlap density difference and thus a hardness difference between the inner and outer peripheral ends of the body layer b.

The polishing surface b ₁ generated between the inner and outer circumferences of the polishing body layer b.
The unevenness of the height and hardness is not only an obstacle to the surface polishing, but also has a risk of causing the grinder to slide in the rotating direction by the recoil and leading to personal injury, which is not preferable.

The present invention relates to a rotary polishing tool using plate-like polishing cloth as a component of a polishing body layer, and has a height and hardness of a polishing surface generated between the inner and outer peripheral portions of the polishing body layer. The purpose is to eliminate uniformity.

[0008]

SUMMARY OF THE INVENTION The present invention provides a rotating substrate,
A polishing body layer formed along a peripheral portion on the substrate,
The polishing body layer is a rotary polishing tool composed of a large number of rectangular polishing plate pieces spread in an inclined stack so as to go around a peripheral portion on the substrate, wherein the polishing plate pieces have a rectangular shape. With the basic shape, based on the inclined state, the lower end side is adhesively fixed to the rotating substrate surface, and the upper end side is cut obliquely so that the cut-off width gradually decreases from the inner peripheral end side to the outer peripheral side. The present invention relates to a rotary polishing tool characterized in that:

In the present invention, it is preferable that the oblique cut portion at the upper end of the polishing plate piece constituting the polishing body layer is located substantially on the radius line of the rotating substrate. In this case, it is preferable that a portion of the upper end portion of the polishing plate piece near the outer peripheral end be cut off obliquely.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the accompanying drawings. FIG. 1 shows a state in which the polishing plate pieces 1 are being inclinedly stacked in the rotary polishing tool of the present invention, and FIG. 2 shows a polishing body layer 2 formed by the inclined stacking of the polishing plate pieces 1.
FIG. 3 shows a schematic cross-sectional shape of the polishing body layer 2 on the radius line of the rotating substrate 3.

In the present invention, the polishing plate piece 1 is made by attaching abrasive grains to a base material such as cloth as a binder with a synthetic resin such as phenol resin as in the case of the conventional product. It has. As shown by the broken line in FIG. 1, the polishing plate piece 1 has a rectangular shape as a basic shape, is adhered and fixed to the surface of the rotating substrate 3 at the lower end 1a in an inclined installation state, and forms a polishing surface 21 at the upper end. are doing. Also, in order to eliminate the difference in the overlapping density between the inner and outer peripheral portions and the difference in hardness, the inclined plate angle a (see FIG. 8) is set from the inner peripheral end side to the outer peripheral end in the same manner as the conventional product. It becomes progressively smaller.

In the present invention, the polishing plate piece 1 has a rectangular basic shape, and from this basic shape, the upper end portion 1a is obliquely cut from the inner peripheral end side to the outer peripheral side as shown by a broken line in FIG. Line 4 has been cut off.

As in the case of the conventional product, in the present invention, since the polishing plate piece 1 is twisted in order to eliminate the overlapping density difference, the surface of the polishing body layer b tends to be inclined. Becomes

In the present invention, since the upper end side of the polishing plate 1 is cut diagonally from the inner peripheral end to the outer peripheral end, the polishing body layer 2 is polished by the diagonal cutting. The inclination of the surface can be suppressed or corrected and absorbed, and the unevenness in the height of the polished surface 21 can be eliminated as schematically shown in FIG.

Further, it has been confirmed that the above structure tends to eliminate the non-uniformity of the overlap density and the hardness. Although the reason is not clear, by cutting off the upper end portion 1a of the polishing plate piece 1 by diagonal cutting, the upper and lower width H of the polishing plate piece 1 gradually decreases toward the inner peripheral end side, whereby the tendency to recover due to twisting (See arrow d in FIG. 9) is suppressed, and this is presumed to be slightly affecting.

In the present invention, the upper end portion 1a of the polishing plate 1
The inclination angle θ3 (see FIG. 1) of the cutting line 4 located on the cut-off line can be selected from a wide range. However, if it approaches 90 °, the effect of eliminating unevenness in height and hardness cannot be sufficiently obtained. On the other hand, if the angle is too small with respect to 90 °, unevenness in height in the opposite direction may occur, so that it is usually 60 to 80 °, preferably 72 °.
It is appropriately selected and determined from the range of about 75 ° in consideration of the number of the polishing plate pieces 1 installed, the inclined installation angle, the hardness, the resilience, the thickness, and the like.

In the present invention, the polishing plate piece 1 is shown in FIGS.
As shown in (1), it is preferable that the upper edge (corresponding to the cutting line 4) is obliquely stacked so as to be located substantially on the radius line 5 of the rotating substrate 3 so as to be perpendicular to the surface to be polished. In this case, if a portion near the outer peripheral side of the side 4 at the upper end of the polishing plate piece 1 hits the surface to be ground at an acute angle, there is a possibility that the surface to be ground is deeply damaged. In addition, it is preferable that the outer portion is cut off by the oblique cut line 6.

The results of a comparison test between the present invention and a conventional product are shown below.

A commercially available polishing cloth was cut to produce a polishing plate piece 1. The dimensions and shape of the polishing plate 1 are as shown in FIG. Seventy-two polishing plates 1 were inclinedly stacked on the surface of the rotating substrate 3 according to a conventional method to form a polishing body layer b, thereby obtaining a product of the present invention. On the other hand, with the product of the present invention, a conventional product of the type shown in FIGS. 5 and 6 having the same configuration except that the polishing plate piece had a rectangular shape was obtained. Then, points on the radius line of the rotating substrate of the product of the present invention and the comparative product are the inner peripheral portion p1, the intermediate portion p2, and the outer peripheral portion p3.
Measure the height and hardness of the polishing body layer at three points,
The results are shown in the following table (average value of n = 10). The hardness is shown by the amount of deformation (mm) at a load of 5 kg.

Table Height (mm) Deformation (mm) Product of the present invention p1 7.68 0.15 ｐ p2 7.65 0.36 ｐ p3 7.58 0.64 Conventional product p1 8.63 0.15 品p2 8.09 0.67 ｐ p3 7.43 1.63 As shown in the above table, according to the present invention, it is possible to almost eliminate variations in the height and hardness between the inner and outer peripheral portions of the polishing body layer.

[0021]

According to the present invention, the unevenness of the height and hardness between the inner and outer peripheral portions of the polishing body layer of the rotary polishing tool can be eliminated, and the quality performance can be improved.

[Brief description of the drawings]

FIG. 1 is a plan view showing a state in which polishing plate pieces according to an embodiment of the present invention are being stacked in an inclined manner.

FIG. 2 is a plan view of a polishing body layer formed by stacking polishing plate pieces in an inclined manner.

FIG. 3 is an explanatory view schematically showing a cross-sectional shape of a polishing body layer on a radius line of a rotating substrate.

FIG. 4 is a plan view showing an example of the shape and dimensions of a polishing plate piece.

FIG. 5 is a plan view showing a state in which a conventional polishing plate piece is being stacked while being inclined.

FIG. 6 is a plan view of a polishing body layer formed by stacking polishing plate pieces in an inclined manner.

FIG. 7 is an explanatory view schematically showing a cross-sectional shape of the polishing body layer on a radius line of the rotating substrate.

FIG. 8 is an explanatory diagram showing a relationship between an installation width W of the polishing plate piece and an installation inclination angle θ.

FIG. 9 is an explanatory diagram showing a tendency of a polishing plate piece to recover from twisting.

[Explanation of symbols]

 Reference Signs List 1 polishing plate piece 2 polishing body layer 3 rotating substrate 4 diagonal cutting line 5 radius line 6 diagonal cutting line

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Shigeo Suzuki 2062 Kizumi, Kaizuka, Osaka Pref. New Registon Co., Ltd. (72) Fukuichi Kitani 2062 Kizumi, Kizuka, Osaka Pref. (Reference) 3C063 AA06 AB05 BA14 BA25 BA31 BC03 BE04 BE16 BG07 BH17 BH20

Claims (3)

[Claims] 1. A rotating substrate, and a polishing body layer formed along a peripheral portion on the substrate, wherein the polishing body layer is spread in an inclined stack so as to go around the peripheral portion on the substrate. In the rotary polishing tool composed of a large number of rectangular polishing plate pieces, the polishing plate piece has a basic shape of a rectangle, based on an inclined state, and is adhered and fixed to the rotating substrate surface at the lower end side, A rotary polishing tool characterized in that the upper end side is obliquely cut such that the width of the cut-off portion gradually decreases from the inner peripheral end side to the outer peripheral side. 2. The rotating device according to claim 1, wherein the oblique cut portion at the upper end of the polishing plate piece constituting the polishing body layer is located substantially on the radius line of the rotating substrate. Polishing tool. 3. The rotary polishing tool according to claim 2, wherein a portion of the upper end portion of the polishing plate piece near the outer peripheral end is cut off obliquely.