JPH06246643A - Polishing unit - Google Patents

Abstract

PURPOSE:To improve contactability with a polished workpiece by bonding adjacent polishing sheets through a net, sticking a bonding agent to a thread member formed with a mesh, so as to give flexibility to a polishing part, in a polishing unit formed by laminating a plurality of the polishing sheets. CONSTITUTION:This polishing unit, used by mounting on a rotary mechanism of portable sander or the like, has a disk-shaped polishing part 2 of laminating a plurality of ring-shaped polishing sheets 1 and a mounting part 3 mounted on a central part of this polishing part 2 to be mounted on the rotary mechanism. The polishing sheet 1 is formed of those connected with abrasive grains to a surface of base material (cloth and paper) of generally used polishing cloth, sand paper, etc., by a thermosetting binder of phenol resin or the like. Many cut grooves 5 having a width are formed from an external edge toward the central part, in each polishing sheet 1. The adjacent polishing sheets 1 are bonded to each other through a net 6 of sticking a bonding agent to a thread member formed into a mesh.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a polishing body attached to a rotating mechanism such as a portable sander.

[0002]

2. Description of the Related Art As a conventional polishing body, as shown in FIG. 7, a disk-shaped substrate 22 having a mounting hole 21 for mounting on a rotating mechanism is provided, and a plurality of ring-shaped substrates are provided on the surface of the substrate 22. There is one in which the polishing sheet 23 is adhered and laminated with an adhesive 28 to form a disc-shaped polishing portion 24. The adhesive 28 is sufficiently adhered to the inner peripheral portion of each adjacent polishing sheet 23 up to about 1/3 in the width direction, and a mesh opening is formed between the substrate 22 and the lowermost polishing sheet 23. Adhesive 2
The net 29 is interposed in order to increase the coating amount by holding 8 and strengthen the adhesive force between them. The drive shaft 25 of the rotating mechanism is inserted into the mounting hole 21 so that the nut 2
6 is for making the polishing body removable. In addition, 27 is a to-be-polished object.

[0003]

However, in the above-mentioned conventional one, since the inner peripheral portion of the surface of each polishing sheet 23 is integrally fixed by the adhesive 28, as shown by the chain double-dashed line in FIG. In addition, the object to be polished 27 abuts the solidified adhesive 28 and cannot be polished, so that the polishing section 24 cannot be effectively used, which is uneconomical.

Therefore, in view of the above problems, it is an object of the present invention to provide a polishing body which can effectively utilize a polishing portion formed by a polishing sheet.

[0005]

In order to achieve the above object, the present invention takes the following means. That is, the feature of the present invention is that in a polishing body in which a plurality of polishing sheets are laminated to form a disk-shaped polishing portion, and an attachment portion for attaching to a rotating mechanism is provided in the central portion of the polishing portion, The point is that the adjacent abrasive sheets are bonded and laminated via a net in which an adhesive is attached to the thread members forming the mesh.

In addition, a large number of kerfs are formed in each laminated polishing sheet from the outer edge toward the central portion. Further, in a polishing body in which a belt-shaped polishing sheet is wound around a mounting shaft attached to a rotating mechanism to form a wheel shape, an adjacent polishing sheet forms a mesh via a net in which an adhesive is attached to a thread member. It is attached and wound.

[0007]

When the polishing body is attached to the rotating mechanism and the polishing body is rotated to bring the polishing portion into contact with the object to be polished, the object to be polished is polished and the polishing portion is also worn away. When the polishing sheet on the outer surface is worn away, the net interposed between the polishing sheet on the inside and the polishing sheet on the inside is exposed, but since this net does not have adhesive in the openings of the mesh, it is easily worn by the object to be polished, The object to be polished is polished by the next polishing sheet. Similarly, as the polishing sheet is worn out, the object to be polished is further polished by the lower or inner polishing sheet, and almost the entire polishing portion can be effectively used. Further, since the polishing sheet is bonded via the net having the mesh openings,
The flexibility of the polishing section is maintained, and the contact with the object to be polished during polishing is improved.

Further, if the polishing sheet is provided with a cut groove, the flexibility of the polishing portion is further improved. In particular, if a cut groove having a width is provided, polishing debris is promptly removed and polishing efficiency is improved. To do.

[0009]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 shows a first embodiment of the present invention. A polishing body according to the present invention is provided in a disk-shaped polishing section 2 in which a plurality of ring-shaped polishing sheets 1 are laminated, and in a central portion of the polishing section 2. And a mounting portion 3 for mounting on the rotating mechanism.

The polishing sheet 1 is made of a commonly used polishing cloth, sandpaper, etc., and is used as a base material (cloth or paper).
Abrasive grains are bonded to the surface of the above with a thermosetting binder (binding agent) such as a phenolic resin. As for the through hole 4 in the center of each polishing sheet 1, the upper three sheets are large and the lower two sheets are small as shown in the sectional view of FIG. Further, each polishing sheet 1 is formed with a large number of kerfs 5 each having a width from the outer edge toward the central portion. Further, as shown in the front view of FIG. The polishing sheets 1 are laminated so that the position 5 is sequentially displaced in the circumferential direction.

A net 6 having a mesh is interposed between the adjacent polishing sheets 1, and the polishing sheets 1 are bonded to each other by an adhesive agent attached to a thread member forming the mesh of the net 6. There is. The net 6 has a ring shape having an outer diameter slightly smaller than that of the polishing sheet 1, and the through hole 7 in the center has two large upper portions and two small lower portions. The thread member uses glass fibers bundled to have a diameter of about 0.3 to 1 mm, and the size of the openings 8 of the mesh is about 1 to 10 mm on each side. This is because when the mesh openings 8 are smaller than this, the adhesive is likely to adhere to the openings 8, and when the mesh openings 8 are larger than this, the adhesive force of the polishing sheet 1 is reduced and the polishing sheet 1 is easily peeled off. . The thread member may be subjected to an appropriate coupling treatment in order to improve the adhesiveness of the adhesive.

As the adhesive, a thermosetting epoxy-based or phenol-based thermosetting resin adhesive is used so as to withstand frictional heat during polishing. The adhesive also acts to prevent the bundled glass fibers from falling apart. A reinforcing member 9 made of a cotton fiber compression molded body or a synthetic resin is adhered to the surface side of the mounting portion 3 so as to press down the inner peripheral portions of the upper polishing sheet 1 and the net 6. Due to this, the mounting portion 3 is formed firmly and thinly. Further, a mounting hole 1 which penetrates the polishing body is provided in the central portion.
0 is provided, and a decorative sheet 11 made of a non-woven fabric such as nylon is adhesively attached to the back surface of the polishing body.

As shown in FIG. 2, the polishing body is manufactured as follows.
A decorative sheet 11, a polishing sheet 1, a net 6 having an adhesive attached to a thread member, and a reinforcing member 9 are placed in this order on the lower mold 12, and the upper surface between the upper mold 13 and the lower mold 12 is The polishing sheet 1 and the reinforcing member 9 are adhered to each other by being pressed and heated so as to have a concave shape. Next, a usage example of the above-mentioned polishing body will be described. First, a drive shaft (not shown) of the rotating mechanism is inserted into the mounting hole 10 to attach the polishing body to the rotating mechanism. Next, the polishing body is rotated to bring the polishing portion 2 into contact with the polishing target body. As a result, the object to be polished is polished and the polishing portion 2 is also worn away. When the first polishing sheet 1 is worn out, the net 6 interposed between the first polishing sheet 1 and the second polishing sheet 1 is exposed, but since this net 6 does not have an adhesive in the openings of the mesh, the net to be polished is It is easily worn away by the body, and the body to be polished is polished by the second polishing sheet 1. At this time, the adhesive is attached to the portion of the surface of the second polishing sheet 1 corresponding to the thread member, but the amount thereof is small, and the portion corresponding to the mesh opening 8 holds the adhesive. Since there is no net 6, the net 6 is easily worn away by the object to be polished,
It does not hinder the polishing work.

When the second polishing sheet 1 is worn out, the object to be polished can be polished by the third, fourth, and fifth polishing sheets 1 in this order, and the polishing section 2 can be used to the end, which is extremely economical. Target. In addition, since the upper surface of the mounting portion 3 of the polishing body is formed in a concave shape, the nuts for mounting to the rotating mechanism do not interfere with the work, which facilitates the use of the polishing portion 2 until the end. . In addition, since the polishing sheet 1 is adhered via the net 6 and the scoring grooves 5 are provided in the polishing sheet 1, the polishing portion 2 has good flexibility and the object to be polished at the time of polishing operation. The contact property with the polishing sheet 1 is improved, and the polishing sheet 1 does not come apart.

Further, unlike the prior art, since the substrate is not provided below the polishing section 2, as shown in FIG. 3, when the polishing body is brought into contact with the workpiece 14, the polishing section bends. It is also intended to prevent damage to the object to be polished 14 at the initial contact with the object to be polished 14. Moreover, the kerf 5 of the adjacent polishing sheet 1
Since the position of is configured to be displaced in the circumferential direction,
The bend is smooth. Also, the kerf 5 having a width
Since it is provided, the removal of polishing debris is performed quickly,
Good polishing efficiency.

In this embodiment, since there is no substrate below the polishing section 2 as described above, it is economical and the polishing operation can be performed without worrying about the substrate. FIG. 4 shows the second aspect of the present invention.
An example is shown in which a disk-shaped substrate 15 is provided below the polishing body, and the central through holes 4 and 7 of the two inner polishing sheets 1 and the two nets 6 are enlarged to make the mounting portion 3 An adhesive 16 is interposed in the mesh openings 8 of the net 6. In addition,
Of course, no adhesive is held in the mesh openings 8 of the polishing section 2. The substrate 15 may be extended in the outer peripheral direction as shown by the chain double-dashed line, and the substrate 15 may be omitted as shown in FIG. Further, a plurality of the same polishing sheets may be laminated and adhered to the lowermost polishing sheet 1 as a substrate with an adhesive. The other configurations and effects are similar to those of the first embodiment, and therefore, the same reference numerals are given and the description thereof is omitted.

FIG. 5 shows the third and fourth embodiments of the present invention.
The right half is the third embodiment and the left half is the fourth embodiment. Third
The embodiment is provided with a disk-shaped substrate 15 provided with a mounting hole 10 for mounting on a rotating mechanism, and a plurality of ring-shaped polishing sheets 1 are laminated on the surface of the substrate 15 via a net 6 to form a disk-shaped polishing portion. In the same manner as in the first embodiment, an adhesive is attached to the thread member forming the mesh of the net 6 to form a polishing body. Also in this embodiment,
The polishing part 2 can be used to the end as in the first embodiment.

As shown by the chain double-dashed line in the figure, the outer peripheral end of the kerf 5 of the polishing sheet 1 may be provided with a predetermined angle offset in the circumferential direction. In this case, if the polishing body is attached so that the rotational direction (a) of the rotating mechanism and the direction of deviation of the kerf 5 are opposite to each other, polishing debris can be removed more smoothly. Further, the net 6 on the substrate 15 may be made to hold an adhesive in the mesh opening to improve the adhesive force as in the conventional case.

In the fourth embodiment, the ring-shaped polishing sheet 1 in the third embodiment is divided into scales. Further, as in the first embodiment, the polishing sheets 1 vertically adjacent to each other are used.
The position may be displaced in the circumferential direction. In addition, as in the present embodiment, the gap 5a between the divided polishing sheets 1 is used.
Is also included in the concept of the kerf 5 of the present invention. FIG. 6 shows a fifth embodiment of the present invention, in which a mounting shaft 1 mounted on a rotating mechanism is mounted.
A belt-shaped polishing sheet 1 is wound around 7 around a net 6 in a wheel shape to form a polishing body. In addition,
An adhesive is attached to the thread members forming the mesh of the net 6 as in the first embodiment, and the mounting shaft 17 and the polishing sheet 1 are also attached.
Are bonded by an adhesive 16.

Also in this embodiment, when the polishing sheet 1 on the outer periphery is worn away by the polishing operation, the object to be polished can be polished by the polishing sheet 1 on the inner side.
Can be used, which is extremely economical. The present invention is not limited to the above embodiment,
Instead of glass fiber, carbon fiber or other inorganic fiber or thermosetting synthetic resin fiber can be used for the thread member that constitutes the net 6, and is shown by a chain double-dashed line in the right half of FIG. 1 (a). As described above, it is possible to extend the kerf 5 to divide the polishing sheet 1 into scales. Furthermore, the net 6 may be provided with a kerf so as to give the polishing section 2 flexibility,
The kerf in each embodiment may be a kerf having no width. However, when the scoring groove is provided in the polishing sheet 1, as described above, the polishing dust is more easily removed from the polishing surface when the polishing sheet 1 has a width.

[0021]

According to the present invention, since the adjacent polishing sheets are bonded and laminated or wound around the thread member forming the mesh via the net having the adhesive adhered thereto, the polishing portion has flexibility. It is possible to improve the contact property with the object to be polished during the polishing operation, and to use the polishing portion effectively, which is extremely economical.

Further, since a large number of kerfs are formed from the outer edge toward the center of each laminated polishing sheet,
Furthermore, the flexibility of the polishing section can be improved.

[Brief description of drawings]

FIG. 1 shows a first embodiment of the present invention, in which (a) is a partially omitted plan view, (b) the right half is a longitudinal end view thereof, and the left half is a front view.

FIG. 2 is a front view showing the manufacturing example of FIG.

FIG. 3 is a front view showing an example of use of FIG.

FIG. 4 is a partially omitted vertical sectional view showing a second embodiment of the present invention.

FIG. 5 shows the third and fourth embodiments of the present invention, the right half shows the third embodiment, the left half shows the fourth embodiment, (a) is a partially omitted plan view, (b) is the same. It is a vertical end view and a front view.

FIG. 6 shows a fifth embodiment of the present invention, (a) is a plan view,
(B) is a longitudinal sectional view.

FIG. 7 is a partially omitted vertical sectional view showing a conventional example.

[Explanation of symbols]

 1 Polishing Sheet 2 Polishing Part 3 Mounting Part 5 Cut Groove 6 Net 17 Mounting Shaft

Claims (3)

[Claims] 1. A polishing body in which a plurality of polishing sheets are laminated to form a disk-shaped polishing portion, and an attachment portion for attaching to a rotating mechanism is provided in a central portion of the polishing portion. An abrasive body characterized in that it is adhered and laminated via a net having an adhesive attached to the thread member forming the. 2. The polishing body according to claim 1, wherein a large number of kerfs are formed from the outer edge toward the center of each laminated polishing sheet. 3. A polishing body in which a belt-shaped polishing sheet is wound around a mounting shaft attached to a rotating mechanism to form a wheel shape, and an adjacent polishing sheet has an adhesive attached to thread members forming a mesh. An abrasive body characterized by being bonded and wound via a net.