JP2003117842A - Soft disc for polishing and its manufacturing method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a soft disc for polishing and its manufacturing method capable of making table grinding and polishing of any work whether hard or soft even if the operation is made at an ultra-high speed and achieving an elongation of the polishing time life of each disc. SOLUTION: The soft disc 1 for polishing is composed of a rear base board 3 used to make grinding and polishing the work and rotating upon being mounted on a rotary tool and a grinding material 6 including a ring part 7 having an outside diameter and inside diameter in which several pieces of grinding strips 2 arranged radially from the center of the ring are adhered fast. The grinding strips 2 are made from sandpaper, while a bonding agent to adhere the strips 2 is made of a normal temperature hardening resin or a hot hardening resin, and each strip 2 is furnished with at least one notch 8 formed by notching in such a way as including the polishing start part.

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to an abrasive disc and a manufacturing method. More specifically, the present invention relates to an improved polishing disk that is used by being attached to a rotary tool such as a grinder for grinding and polishing materials such as steel, non-ferrous metals, stones, wood, and ceramics, and a method for manufacturing the same. It is a thing.

[0002]

2. Description of the Related Art A disc-type grindstone for polishing is installed on a polishing machine and rotated to produce ferrous steel, non-ferrous metal, stone,
It is used for grinding and polishing work materials such as wood and ceramics, and is used by being attached to a rotary tool such as a grinder. It is used in a wide range of fields such as the construction industry, shipbuilding industry, civil engineering industry, and electrician industry.

Examples of conventional grinding and polishing disc technologies include offset type resinoid grindstone discs. This is a disc-shaped disc made of a phenol grindstone, and is mainly used for grinding. Since the offset type resinoid grindstone disc does not have good air permeability during grinding, the heat dissipation of the grinding surface is inferior, the work material is burnt, and the disc itself becomes clogged due to wear of the disc and grinding scraps of the work material. There was a problem that the ability was reduced.

The offset type flexible grindstone disc is a thin disc-shaped disc made of a glass net reinforcing grindstone, and can be used for a wide range of purposes such as cutting, grinding and polishing. It has a good cushioning property and is suitable for grinding and polishing of flat surfaces, but it has a problem that abrasion and wear are rapid, the disk is clogged, and the work material is burned due to poor heat dissipation during use. Also, the target work material is
Limited to steel, cast iron and stainless steel.

[0005]

SUMMARY OF THE INVENTION The present invention has been made in view of the above conventional problems, and an object of the present invention is to provide an abrasive with a sand having a flexible base cloth coated with abrasive grains. Adopting a structure in which paper strips are cut out so as to include the polishing start end portion, and strip abrasive pieces having at least one cutout portion are radially overlapped and bonded with a thermosetting resin. As a result, one kind of soft disk for polishing can perform stable grinding and polishing from a hard material to a softer material, regardless of the work material, even at an extremely high rotation speed of 10,000 rpm or more, Another object of the present invention is to provide a soft disk for polishing which realizes extension of polishing time per sheet and a manufacturing method thereof.

[0006]

[Means for Solving the Problems] That is, according to the present invention, a back plate substrate used for grinding and polishing a material and attached to a rotary tool to rotate, and a ring portion having a ring portion having an outer diameter and an inner diameter. A soft disk for polishing consisting of an abrasive material to which a plurality of strip abrasive pieces radially arranged from the center are adhered, the strip abrasive pieces are made of sandpaper,
A room temperature curable resin or a heat curable resin is used as the binder for adhering the strip abrasive pieces, and each strip abrasive material is formed with at least one cutout portion cut out so as to include the polishing start end portion. A soft disc for polishing,
Will be provided.

In the polishing soft disk of the present invention, the cutout portions of the plurality of strip abrasive pieces are preferably formed so as not to be aligned on the same circumference with the center of the ring as a fixed point. It is preferable that each of the cutout portions of the one piece of the strip-shaped abrasive piece has a shape of a truncated circle, a V shape, or a square shape. Further, as the abrasive material, it is preferable to form strip abrasive pieces of different sizes.

The roughness count of sandpaper is about 30.
Preferably, the sandpaper base fabric is made of cotton or paper that is soft and is not easily melted by heat, and the sandpaper base fabric is made of pure cotton or blended fabric. It is preferable.

Further, the room temperature curable resin and the heat curable resin are melamine resin, silicone resin, which causes a polycondensation reaction,
It is possible to select and use from among phenol resin, urea resin, epoxy resin which causes polyaddition reaction, and acrylic resin.

The size of the frontage and the depth of the notch is preferably about 3 to 5 mm, and the interval between the notches adjacent to each other is preferably about 10 to 20 mm.

In the polishing soft disk of the present invention, it is preferable that the strip abrasive pieces are arranged in a radial pattern by overlapping the strip abrasive pieces so that the recesses remain.

The length of the side edge portion of the strip abrasive piece arranged along the circumference of the inner diameter of the ring portion is 1/12 to 1/8 of the circumference of the inner diameter of the ring portion, It is preferable that the length of the polishing start end portion arranged along the radial direction of the ring portion is 4/5 to 9/8 of the radial length of the ring portion.

The abrasive material is obtained by adhering the side end of the strip abrasive piece to the tangent line of the circumference of the inner diameter of the ring portion, and adhering the polishing start end portion of the strip abrasive piece in the radial direction of the ring portion. In order to improve safety, it is preferable that 3 to 10 strip abrasive pieces are stacked in the thickness direction of the ring portion and that the overlap margin is about 1 to 5 mm. At this time, the abrasive material is formed by stacking two strip abrasive pieces as one set in the thickness direction of the ring portion, and of the two strip abrasive pieces, one of the strip abrasive pieces has a part of the cutout portion of the other strip abrasive piece. The strip abrasive pieces may be overlapped with each other so as to be covered with the strip abrasive pieces, and one set of strip abrasive pieces and one set of adjacent strip abrasive pieces may be overlapped with each other with an interval of at least 5 mm.

The material of the back plate substrate is preferably a glass fiber reinforced phenol laminated plate having a fluffed or uneven surface and capable of enhancing the binding force with the strip abrasive pieces. It is also preferable that the glass fiber reinforced phenol laminated plate contains abrasive grains, and the back plate substrate has polishing ability.

Further, according to the present invention, a back plate substrate which is used for grinding and polishing of a material and which is attached to a rotary tool and rotates, and a ring portion having an outer diameter and an inner diameter, which are arranged radially from the center of the ring. A method of manufacturing a soft disk for polishing, which comprises an abrasive material to which a plurality of strip abrasive pieces are adhered, wherein at least 1 is cut out so as to include a polishing start end portion.
The strip abrasive pieces and the strip abrasive pieces made of sandpaper, each of which has two notches, are placed in a predetermined array with a room temperature curable resin or a thermosetting resin sandwiched therebetween, and the temperature is approximately 80 to
It is characterized in that the strip abrasive piece and the back plate substrate are laminated and adhered after bonding and hardening at 200 ° C. under a pressure of about 10 to 100 kgf / cm ³ for about 1 to 10 hours. A method of manufacturing a soft disc for polishing is provided.

[0016]

BEST MODE FOR CARRYING OUT THE INVENTION The soft disc for polishing of the present invention will be described below with reference to the drawings. FIG. 1 is a view showing an embodiment of a soft disk 1 for polishing according to the present invention, and is a perspective view of a surface on an abrasive material side. A back plate substrate 3 which is attached to a rotary tool such as a grinder through the shaft hole 4 to rotate;
It is constituted by an abrasive material 6 to which strip abrasive pieces 2 arranged radially from the center of the ring of the ring portion 7 are adhered. With a rotating tool such as a grinder, it is possible to rotate at a speed of 10,000 rpm or more for grinding and polishing.

In the present invention, sandpaper made by applying abrasive grains to a soft base cloth is used as the material for the strip-shaped abrasive pieces 2, and the binder for adhering the strip-shaped abrasive pieces 2 is a room temperature curable resin or Each of the strip-shaped abrasive pieces 2 radially arranged as the abrasive material 6 using the thermosetting resin has at least one notched portion which is notched so as to include the polishing start end portion and is large. There are features.

By doing so, since the abrasive material 6 in contact with the work material is moderately soft, even while polishing the work material, the wear material itself is moderately worn, the contact with the work material is softened, and the calorific value can be reduced, resulting in burning. Occurrence of is suppressed. Even if the wearer wears itself, the strip abrasive pieces 2 as sandpaper are radially overlapped. Due to the structure, unablated surfaces appear one after another in the abrasive material 6 and contact with the work material to continue polishing.

In particular, in the present invention, as shown in FIG. 1, each of the strip abrasive pieces 2 has a cutout portion 8 so that more irregularities are formed as compared with the conventional sandpaper type disc. Therefore, the polishing surface is less likely to be smooth, and the polishing time per disk can be extended. At this time, if the cutout portions of the plurality of strip abrasive pieces are formed so as not to be aligned on the same circle with the center of the ring as a fixed point, as shown in FIG. In addition, the polished surface is less likely to be smoother, which is more preferable.

The shape of the cutout portion is not particularly limited, but as shown in FIGS. 6A to 6E, a shape such as a truncated circle shape, a V shape, or a square shape can be mentioned. As shown in (b) and FIG. 6 (e), a plurality of notches may be provided at a predetermined interval. Further, as shown in FIG. 6E, the strip abrasive piece 2 may be provided with an appropriate number of holes 9. Providing cutouts such as these on the strip abrasive piece can prevent clogging due to chips.

Further, in the present invention, as shown in FIG. 4, it is preferable that the abrasive material is formed by strip abrasive pieces having different sizes. In FIG. 4, a polishing soft disk is formed by strip abrasive pieces having a polishing start end portion of two sizes, large and small. When a small circular cutout is formed in the center of the polishing start edge of each large and small strip, and the strips are radially bonded so that the outer circumferences are aligned, the cutout will be centered on the ring. Since it is formed so as not to be aligned on the same circle as a fixed point and the length of the polishing start end portion is different, a step can be formed between adjacent strip abrasive pieces, so that more irregularities are formed. . If formed in this way, the polishing time per disk can be significantly extended.

In the present invention, as shown in FIGS. 5 (a) and 5 (b), the abrasives are superposed in the thickness direction of the ring portion 7 with two strip abrasive pieces 2 as one set. Of the two strip abrasive pieces 2, one of the strip abrasive pieces 2 is overlapped so that a part of the cutout portion 8 of the strip abrasive piece 2 is covered by the other strip abrasive piece 2, and one set of strip abrasive pieces 2 is formed. A pair of adjacent strip abrasive pieces 2 may be formed by being overlapped with each other with a space of at least 5 mm or more. In the present embodiment, by using strip abrasive pieces having the same length of the polishing start end portion, adjacent strip abrasive pieces 2 in one set have notched circular notches at different positions. , A soft disc for polishing is formed. If formed in this manner, irregular steps are formed, so that a larger number of irregularities are formed. Moreover, since the strip abrasive pieces do not overlap each other, it is possible to reduce the thickness of the disc without reducing the polishing time for each disc and to reduce the storage space of the disc. At this time, as shown in FIG. 5C, when the abrasive material is formed by the strip abrasive pieces 2 (2a, 2b) of different sizes, the strip abrasive pieces 2 (2a, 2) that are radially overlapped are formed.
The thickness of b) is preferable because it does not become too thick in the inner diameter direction of the ring portion 7. The disc of FIG. 5 shows an example in which two strip abrasive pieces 2 are set as one set, but three sets are set as one set,
Alternatively, four sheets may be set as one set.

FIG. 7A shows the soft disc 1 for polishing,
It is sectional drawing before using for polishing, and FIG.7 (b) is sectional drawing after using for polishing. Since the back plate substrate 3 is also provided with a polishing ability, as described above, the strip abrasive pieces 2 constituting the abrasive material 6 are used for polishing most of the portion up to the surface of the back plate substrate 3, There is no waste and it is advantageous in terms of cost. Moreover, since the contact with the work material is soft,
It also has the side effect of reducing vibration and noise during work.

Further, since the room temperature curable resin or the thermosetting resin is used as the binding material for adhering the strip abrasive pieces 2 to each other, even if the temperature is increased by heat generation at a high rotation speed of over 10000 rpm, the strip abrasive pieces 2 As will be described later, the back plate substrate 3 and the strip-shaped abrasive pieces 2 are firmly adhered to each other without peeling off or dividing, so that stable work can be performed.
No maintenance required.

In FIG. 1, the strip abrasive piece 2 has a ring portion 7.
In the polishing soft disc 1 which is arranged so as to have recesses and which is rotated at a high speed during polishing, an air flow can be generated from the center of the ring portion 7 to the outside, thereby enhancing the cooling effect, and thus burning. To prevent. This strip abrasive piece 2
Is made of sandpaper as described above, and its roughness count is about 30 to 1000 #, which can be selectively used according to the work material to be polished and the degree of finishing quality, and a wide range from roughing to finish polishing. Can be applied to. Since the abrasive 6 wears by itself, it is preferable that the constituent strip abrasive pieces 2, that is, the base cloth of the sandpaper, is also a soft and wearable material. However, a nylon-based sheet that melts by heat is not suitable. In particular,
The sandpaper base fabric is preferably made of soft or heat-fusible cotton or paper, and further, the sandpaper base fabric is preferably made of pure cotton or blended fabric. When using mixed spinning,
From the viewpoint of having suitable strength, it is preferable that the polyester content is 30% or less and the other parts are pure cotton.

2A and 2B are views showing one embodiment of the soft disk 1 for polishing according to the present invention, FIG. 2A is a plan view of the surface on the abrasive material side, and FIG. 2B is a side view. Is. As described above, the strip abrasive pieces 2 are arranged radially on the back plate substrate 3 from the center of the ring of the ring portion 7 to form the abrasive material 6, and the front face of the notch portion formed in the strip abrasive pieces. And the size of the depth is preferably about 3 to 5 mm, and the distance between the notches adjacent to each other is preferably about 10 to 20 mm. The size of the notch and the installation interval may be determined from this range depending on the work material to be polished and the roughness count of the sandpaper used, which is the roughness of the abrasive.

The material of the back plate substrate 3 is a glass fiber reinforced phenol laminated plate having irregularities on the surface, and is made by using a room temperature curable resin or a heat curable resin at a temperature of about 80 ° C. for about 3 hours. Since it is baked and adhered to the strip abrasive piece 2 robustly, the strip abrasive piece 2 can rotate even at a high speed of 10,000 rpm or more.
The abrasive material 6 made of is not peeled off from the back plate substrate 3 and is stably polished.

2C to 2E are partial sectional views of the strip abrasive piece 2 of the soft disk for polishing 1 in FIG. 2A, and FIG. 2C is a sectional view taken along line AA. 2D is a sectional view taken along the line BB, which is a portion where the notch portion 8 is provided, and FIG.
FIG. For details of the size of the strip abrasive piece 2,
The length of the side end portion arranged along the circumference of the inner diameter of the ring portion 7 is 1/8 to 1/12 of the circumference of the inner diameter of the ring portion 7, and The length of the polishing start end portion arranged along the radial direction is 4 / the length of the ring portion 7 in the radial direction.
Suitably 5-9 / 8.

As described above, the strip abrasive piece 2 has the ring portion 7
Are arranged radially from the center of the ring, but more specifically, the side ends of the strip abrasive pieces 2 are attached to the tangent line of the circumference of the inner diameter of the ring portion 7, and the polishing start end portion of the strip abrasive pieces 2 is bonded. Are bonded in the radial direction of the ring portion 7. Further, 3 to 10 strip abrasive pieces 2 are stacked in the thickness direction of the ring portion 7, and the overlap margin of the stack is arranged and adhered to be about 1 to 5 mm.

For example, a soft polishing disk having a diameter of 100 mmφ has a side end portion of 20 mm and a polishing start end portion of 25 mm.
And a strip abrasive piece having a circular cutout portion with a frontage of 5 mm in the center of the polishing start end portion, and a side end portion of 20 mm,
Two kinds of strip abrasive pieces, one having a polishing start end of 20 mm and the other having a cutout of a circular shape with a frontage of 5 mm formed in the center of the polishing start end, are alternately superposed side by side in the thickness direction. The number of stacked sheets is 4, and the margin is 3 mm
However, good, stable, and durable polishing ability was obtained.

A strip abrasive piece 2 made of sandpaper, which is cut out so as to include the polishing start end portion and at least one notch portion 8 is formed, is heated at a temperature of 80 to 80 with a room temperature curable resin or a thermosetting resin. 200 ℃, pressure is about 10
It is manufactured integrally by being subjected to a bond hardening treatment under 100 kgf / cm ³ for 1 to 10 hours. It should be noted that more preferable bond curing conditions are a temperature of 100 to 150 ° C. and a time of 2 to 6 hours, and bolting may be used as a means for applying pressure. It should be noted that the strip abrasive pieces 2 used, that is, sandpaper having a thickness of about 0.5 to 1.5 mm is used.

[0032]

As described above, according to the present invention, it is possible to perform stable grinding and polishing regardless of the material to be ground from hard to soft by one kind of soft disk for polishing with high versatility. Further, it is possible to provide a soft disk for polishing which realizes extension of polishing time per disk and a method for manufacturing the same.

[Brief description of drawings]

FIG. 1 is a view showing an embodiment of a soft disk for polishing according to the present invention, and is a perspective view of a surface on an abrasive material side.

2A and 2B are views showing an embodiment of a soft disk for polishing according to the present invention, FIG. 2A is a plan view of a surface on an abrasive material side, and FIG. 2B is a side view. , FIG. 2 (c) is shown in FIG.
2A is a sectional view taken along line AA in FIG. 2A, and FIG.
2B is a sectional view taken along line BB in FIG. 2A, and FIG.
It is CC sectional drawing in (a).

FIG. 3 is a diagram showing another embodiment of a soft disk for polishing according to the present invention, and is a perspective view of a surface on an abrasive material side.

FIG. 4 is a view showing yet another embodiment of a soft disk for polishing according to the present invention, and is a perspective view of a surface on an abrasive material side.

FIG. 5 is a view showing still another embodiment of the soft disk for polishing according to the present invention, FIG. 5 (a) is a perspective view of the surface on the abrasive material side,
5B is a partially enlarged view of FIG. 5A, and FIG. 5C is a partially enlarged view showing an embodiment different from FIG. 5B.

FIG. 6 is a plan view showing an embodiment of strip abrasive pieces used for the soft disc for polishing according to the present invention.
FIG. 6A shows a cutout having a circular shape with one cutout, and FIG. 6B shows a cutout with a circular shape having two cutouts. Yes, FIG. 6 (c)
The shape of the notch is V-shaped and has one notch, and the shape of the notch is square in FIG. 6D.
FIG. 6 (e) shows that the shape of the notch is an oval shape, two notches, and a plurality of holes.

FIG. 7 is a view showing an embodiment of a soft disk for polishing according to the present invention, FIG. 7 (a) is a sectional view taken along the line D-D in FIG. 2 (a) before use, and FIG. ) Is the figure after use
It is a DD sectional view in (a).

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Soft disk for polishing, 2 (2a, 2b) ... Strip abrasive pieces, 3 ... Back plate substrate, 4 ... Shaft hole, 5 ... Adhesive layer, 6 ... Abrasive material,
7 ... Ring part, 8 ... Notch part, 9 ... Hole part.

   ─────────────────────────────────────────────────── ─── Continued front page    F term (reference) 3C063 AA10 AB05 BA14 BA23 BE04                       BE16 BG01 BG07 BG22 BG23                       BH03 FF23

Claims (16)

[Claims] 1. A back plate substrate which is used for grinding and polishing a material and which is attached to a rotary tool to rotate, and a plurality of strip abrasives radially arranged from the center of the ring in a ring portion having an outer diameter and an inner diameter. A soft disk for polishing consisting of an abrasive material to which pieces are adhered, wherein the strip abrasive pieces are made of sandpaper, and a room temperature curable resin or a heat curable resin is used as a binder for adhering the strip abrasive pieces. A soft disk for polishing, wherein each of the strip abrasive pieces is formed with at least one cutout portion cut out so as to include a polishing start end portion. 2. The soft disk for polishing according to claim 1, wherein the cutout portions of the plurality of strip abrasive pieces are formed so as not to be aligned on the same circumference with the center of the ring as a fixed point. 3. The soft disk for polishing according to claim 1 or 2, wherein the cutout portion of each of the plurality of strip abrasive pieces has any one of a truncated circle shape, a V shape, and a square shape. 4. The polishing soft disk according to claim 1, wherein the abrasive material is formed by the strip abrasive pieces having different sizes. 5. The roughness count of the sandpaper is approximately 3
The soft disc for polishing according to any one of claims 1 to 4, which is 0 to 1000 #. 6. The soft disc for polishing according to claim 1, wherein the base cloth of the sandpaper is made of cotton or paper. 7. The soft disc for polishing according to claim 1, wherein the base fabric of the sandpaper is made of pure cotton or blended fabric. 8. The room temperature curable resin and the heat curable resin are a melamine resin, a silicone resin, a phenol resin, a urea resin which cause a polycondensation reaction, and an epoxy resin or an acrylic resin which causes a polyaddition reaction. The soft disc for polishing according to any one of 1 to 7. 9. The size of the frontage and the depth of the cutout is about 3 to 5 mm, and the interval between the cutouts adjacent to each other is about 10 to 20 mm. The soft disc for polishing according to the item. 10. The radial array of strip abrasive pieces is formed by stacking the strip abrasive pieces so that recesses remain.
10. The soft disc for polishing according to any one of claims 9 to 10. 11. The length of a side end portion of the strip abrasive piece arranged along the circumference of the inner diameter of the ring portion is 1/12 to 1/8 of the circumference of the inner diameter of the ring portion. The length of the polishing start end portion arranged along the radial direction of the ring portion of the strip abrasive piece is 4/5 to 9/8 of the radial length of the ring portion. 10. The soft disc for polishing according to any one of 10 to 10. 12. The abrasive material adheres a side end portion of the strip abrasive piece to a tangent line of a circumference of an inner diameter of the ring portion, and a polishing start end portion of the strip abrasive piece is attached to a diameter of the ring portion. And 3 to 10 pieces of the strip abrasive pieces are overlapped in the thickness direction of the ring portion, and the overlap margin of the overlap is about 1 to 5 mm.
The soft disc for polishing according to any one of 1. 13. The abrasive material is formed by stacking two strip abrasive pieces as one set in the thickness direction of the ring portion, and of the two strip abrasive pieces, one of the strip abrasive pieces is A part of the notch is overlapped so as to be covered by the other strip abrasive piece, and at least a distance of 5 mm or more between the one pair of strip abrasive pieces and the adjacent one pair of the strip abrasive pieces. The soft disc for polishing according to any one of claims 1 to 12, wherein the soft disc for polishing is formed by placing the discs on top of each other. 14. The glass fiber reinforced phenol laminated plate, wherein the material of the back plate substrate is a glass fiber reinforced phenol laminated plate having a fluffy surface or an uneven surface and capable of increasing the binding force with the strip abrasive pieces. The soft disc for polishing according to. 15. The soft disc for polishing according to claim 1, wherein the glass fiber reinforced phenol laminated plate is mixed with abrasive grains, and the back plate substrate has a polishing ability. 16. A back plate substrate which is used for grinding and polishing a material and which is attached to a rotary tool to rotate, and a plurality of strip abrasives radially arranged from the center of the ring in a ring portion having an outer diameter and an inner diameter. A method of manufacturing a soft disk for polishing, which comprises an abrasive material having pieces bonded to each other, wherein the strip abrasive piece made of sandpaper has at least one notch formed by cutting so as to include a polishing start end portion. A strip abrasive piece is placed in a predetermined arrangement with a room temperature curable resin or a thermosetting resin sandwiched therebetween, and the temperature is about 80 to 200 ° C. and the pressure is about 10 to 100 kgf.
Under / cm ^3, after binding cured for approximately 1 to 10 hours, the said strip abrasive piece and the back plate substrate, method of manufacturing the abrasive soft disk, characterized in that bonding and laminating .