JP5705363B1 - Abrasive disc - Google Patents

Abstract

A polishing disk capable of preventing the occurrence of deep linear scratches on a workpiece without reducing the cooling effect. In a polishing disc 1 in which a large number of polishing sheet pieces 41 are sequentially shifted and bonded to a circular substrate 3, the outer diameter of the polishing layer 4 composed of the polishing sheet pieces 41 is made larger than the outer diameter of the circular substrate 3. While increasing in size, the end portion on the outer peripheral side of the polishing sheet piece 41 is bent upward to form a rising portion 42. [Selection] Figure 4

Description

  The present invention relates to a polishing disk in which a large number of polishing sheet pieces are superposed and bonded to a circular substrate while being sequentially shifted.

  As shown in FIGS. 7 and 8, this type of polishing disk 101 is made such that a polishing sheet piece 141 formed in a square shape with abrasive grains attached on one side is formed radially on the lower surface of a circular substrate 3 made of metal or the like. The adjacent abrasive sheet pieces 141 are arranged so as to partially overlap each other, and the abrasive sheet pieces 141 are bonded to the substrate mounting surface 35 with an adhesive.

  The circular substrate 3 has a disc insertion hole 31 in which the rotating shaft 51 with a male screw of the hand grinder 5 is fitted in the central boss portion 32. A metal flange 33 is provided around the disc insertion hole 31. This flange 33 portion of the circular substrate 3 is used as an abutting portion for a disk-mounted fixed-side flange 52 and a disk-tightening moving-side flange 53 having a female screw hole 54 provided in advance in the hand grinder 5. .

  In use, as shown in FIG. 8, the disk insertion hole 31 is fitted to the male threaded rotary shaft 51 of the hand grinder 5, and the flange 33 is brought into contact with the fixed-side flange 52. Then, the female screw hole 54 of the moving flange 53 is fitted into the rotary shaft 51 with the male screw and tightened. In this way, the polishing disc 101 is used for grinding and polishing the workpiece while being held between the fixed side flange 52 and the moving side flange 53. In addition, the polishing disc 101 attached in this way is covered with a cover (not shown) attached to the hand grinder 5 in addition to a portion engaged in grinding and polishing for safety.

  In the polishing disk 101 described above, a disk in which the outer diameter of the polishing layer 104 including the polishing sheet piece 141 is larger than the outer diameter of the circular substrate 3 is known (for example, Patent Document 1).

  By making the outer diameter of the polishing layer 104 larger than the outer diameter of the circular substrate 3, the outer periphery of the polishing layer 140 is released from the rigidity of the circular substrate 3, and the workpiece to be ground and polished is utilized by utilizing its flexibility. Grinding and polishing can be performed along a complicated shape (dent, curve, etc.) on the surface.

  However, as shown in FIG. 9, when the hand grinder 5 is tilted and the workpiece 6 is ground and polished, the edge portion 141a of the polishing sheet piece 141 is located on the outer periphery of the polishing layer 104, and the edge portion 141 a contacts the surface of the workpiece 6. When the edge portion 141 a comes into contact with the workpiece 6, deep linear scratches are generated on the workpiece 6.

  A polishing disk that combines surface grinding and curved surface grinding has been proposed (see Patent Document 2). As shown in FIGS. 10 and 11, the polishing disk 102 has a polishing sheet piece 141 formed in a square shape with abrasive grains attached to one side thereof, radially on the lower surface of the circular substrate 3, and adjacent polishing sheet pieces 141. The polishing sheet pieces 141 are arranged so as to partially overlap each other, the edge portions of the polishing sheet pieces 141 are bent to the upper surface portions of the circular substrate 3, and the polishing sheet pieces 141 are fixed to the lower surface and the upper surface of the circular substrate 3 with an adhesive. Is formed. A disc insertion hole 31 for fitting the rotating shaft 51 with a male screw of the hand grinder 5 is provided in the boss portion 32 at the center of the polishing disc 102, and a metal flange 33 is provided around the disc insertion hole 31.

  Such an abrasive disc 102 can be used for grinding and polishing on the upper surface, the lower surface and the outer peripheral surface, and the contact with the workpiece becomes flexible, thereby preventing the occurrence of deep linear scratches.

  In the above-described polishing disc 101, air is taken in from the central portion of the polishing disc 101, and air is discharged from the outer peripheral portion of the polishing sheet piece 141, so that there is a cooling effect and it is possible to prevent the workpiece from being burned and clogged. .

  However, in the polishing disk 102 shown in FIGS. 10 and 11, since the polishing sheet piece 141 is bent and bonded to the upper surface of the circular substrate 3, air can be sufficiently discharged from the outer peripheral portion of the polishing sheet piece 141. The cooling effect is reduced.

Utility Model Registration No. 3004012 Design Registration No. 1414417

  An object of the present invention is to provide a polishing disk that prevents the occurrence of deep linear scratches on a workpiece without reducing the cooling effect.

The present invention provides a polishing disk in which a number of polishing sheet pieces are sequentially stacked and bonded to a circular substrate so that the outer diameter of the polishing layer made of the polishing sheet pieces is larger than the outer diameter of the circular substrate, and the polishing is performed. An end portion on the outer peripheral side of the sheet piece is bent upward to form a rising portion, and an edge portion of the polishing sheet piece is open upward .

  Moreover, it is good to adhere | attach the abrasive sheet pieces of the said rising part.

  In the polishing disk according to the present invention, the outermost periphery of the polishing layer is located at the sheet surface where the polishing sheet piece is folded. Therefore, even if the outer peripheral part of the polishing disk contacts the work, the edge part does not contact the work. Therefore, the sheet surface comes into contact with the workpiece, and there is no risk of damaging the workpiece, so that grinding and polishing can be performed without damaging even a person who is not a skilled worker.

  In addition, since the edge portion of the polishing sheet piece is opened upward, the air taken in from the central portion of the polishing disk is discharged from the gap in the outer peripheral portion of the polishing sheet piece. A disk cooling effect can be obtained.

1 is a top view of a polishing disk according to an embodiment of the present invention. 1 is a bottom view of a polishing disk according to an embodiment of the present invention. 1 is a side view of a polishing disc according to an embodiment of the present invention. It is side surface sectional drawing of the grinding | polishing disc which concerns on embodiment of this invention. It is sectional drawing which shows the state which mounted | wore the grinding disk which concerns on embodiment of this invention with the hand grinder. It is typical sectional drawing which shows the state which inclined the hand grounder equipped with the grinding | polishing disc which concerns on embodiment of this invention, and grind | polished and grind | polished the workpiece | work. It is a bottom view of the conventional grinding disc. It is sectional drawing which shows the state with which the conventional grinding | polishing disc was mounted | worn with the hand grinder. It is typical sectional drawing which shows the state which inclined the hand-grounder with which the conventional grinding | polishing disc was mounted | worn, and grind | polished and grind | polished the workpiece | work. It is a side view of the grinding disk of other examples of the past. It is a perspective view of the grinding disk of other conventional examples.

  Embodiments of the present invention will be specifically described with reference to the drawings. As shown in FIGS. 1 to 5, the polishing disk 1 of the present invention includes a circular substrate 3, a plurality of polishing sheet pieces 41 formed in a square shape with abrasive grains attached to one side, and the polishing sheet pieces 41. And an adhesive that fixes the substrate to the circular substrate 3.

  The circular substrate 3 includes a boss portion 32 having a disc insertion hole 31 at the center and an attachment portion 35 of an abrasive sheet piece 41 integral with the boss portion 32. The circular substrate 3 is formed in a hat shape in cross section so that the boss portion 32 swells upward, the boss portion 32 is high, and the attachment portion 35 is low. The boss part 32 becomes a contact part with the hand grinder 5 when being fixed to the hand grinder 5 (rotating tool). An abrasive sheet piece 41 is attached to the attachment portion 35. The circular substrate 3 is formed of, for example, vulcanized fiber, and the boss portion 32 is reinforced with a multilayer structure.

  The disc insertion hole 31 is a hole for attaching to the hand grinder 5, and is fixed by inserting the rotating shaft 51 with a male screw of the hand grinder 5.

  A flange 33 made of metal or the like is provided so as to sandwich the disk insertion hole 31 of the boss portion 32 from above and below, and the periphery of the disk insertion hole 31 is protected.

  On the mounting portion 35 of the circular substrate 3, the abrasive sheet pieces 41 formed in a square shape with abrasive grains attached on one side are arranged in a radial manner and sequentially shifted so that adjacent abrasive sheet pieces 41 partially overlap each other. The polishing sheet piece 41 is fixed to the attachment portion 35 with an adhesive.

  In this embodiment, the polishing sheet pieces 41 having different sizes are alternately stacked, but the polishing sheet pieces 41 having the same size may be stacked.

  As shown in FIGS. 1 and 4, the outer diameter of the polishing layer 4 made of the polishing sheet piece 41 is made larger than the outer diameter of the circular substrate 3, and the outer peripheral end of the polishing sheet piece 41 is bent upward. A rising portion 42 is formed. On the side surface of the polishing disc 1, the edge portion of the polishing sheet piece 41 is not located, but the folded sheet surface of the polishing sheet piece 41 is located.

  An adhesive 45 is applied to the inner surface of the rising portion 42 on the upper surface side of the polishing disk 1 on the disk substrate 3 side, and the polishing sheet pieces 41 of the rising portion 42 are bonded together to hold the rising portion 42 with a predetermined strength. It is configured as follows.

  As shown in FIGS. 3 and 4, the edge portion 41 a of the polishing sheet piece 41 is open upward. The height of the rising portion 42 is set lower than the height of the boss portion 32. This is because if the height is higher than the boss portion 32, the edge portion 41a may hit a cover (not shown) of the hand grinder 5.

  As shown in FIG. 5, the disk insertion hole 31 is fitted into the male threaded rotary shaft 51 of the hand grinder 5, and the flange 33 is brought into contact with the fixed-side flange 52. Then, the female screw hole 54 of the moving flange 53 is fitted into the rotary shaft 51 with the male screw and tightened. In this way, the polishing disk 1 is used for grinding and polishing a workpiece while being held between the fixed side flange 52 and the moving side flange 53. In addition, the polishing disc 1 attached in this manner is covered with a cover (not shown) attached to the hand grinder 5 in addition to the portion involved in grinding and polishing for safety.

  According to the polishing disc 1 of this embodiment described above, the folded sheet surface of the polishing sheet piece 41 is located on the outermost periphery of the polishing layer 4. As shown in FIG. 6, when the workpiece 6 is ground and polished by tilting the hand grinder 5, the edge portion 41a does not contact the workpiece 6 even if the outer peripheral portion of the polishing disk 1 contacts the workpiece 6, The sheet surface of the polishing sheet piece 41 of the rising portion 42 contacts. For this reason, there is no possibility of damaging the workpiece 6 with a groove, and grinding and polishing can be performed without damaging even a non-skilled worker.

  Furthermore, since the rising portion 42 is easily elastically deformed, the contact with the workpiece 6 becomes flexible, and a clean finished surface can be obtained even if it is not an expert.

  Moreover, since the air taken in from the center part of the grinding | polishing disk 1 is discharged | emitted from the clearance gap of the outer peripheral part of the grinding | polishing sheet piece 41 open | released upwards, the cooling effect of the grinding | polishing disk 1 is acquired. As a result, the workpiece can be prevented from being burned or clogged.

1: Polishing disc 3: Circular substrate 4: Polishing layer 5: Hand grinder 31: Disc insertion hole 32: Boss portion 33: Flange 34: Substrate lower surface 35: Mounting portion 41: Polishing sheet piece 42: Rising portion 45: Adhesive 51 : Rotating shaft 52 with male thread: Fixed flange 53: Moving flange 54: Female thread hole 55: Cover

Claims (2)

In a polishing disk in which a large number of polishing sheet pieces are sequentially shifted and bonded to a circular substrate, the outer diameter of the polishing layer made of the polishing sheet piece is made larger than the outer diameter of the circular substrate, and the outer periphery of the polishing sheet piece A polishing disc , wherein a side end portion is bent upward to form a rising portion, and an edge portion of the polishing sheet piece is open upward . Abrasive disk according to claim 1, the polishing sheet pieces to each other of said rising portion, characterized in that you have been adhered.

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