JP3809158B2 - Grinding disc - Google Patents

Description

  The present invention relates to a rotary grinding disk used for grinding work in construction work or civil engineering work sites.

Conventionally, a segment (chip) using diamond abrasive grains as a grinding disk for flattening, chamfering, and stripping painted surfaces of concrete, building materials, stones, etc., attached to electric tools, A plurality of devices are known along the outer peripheral edge (for example, Patent Document 1).
JP 11-138448 A

Since this conventional grinding disk has a short radial dimension for each segment (chip), the area where the segment is pressed against the surface to be ground (to be ground) during grinding is small and grinding is efficient. It's hard to say that you can.
In addition, a plurality of windows are formed in the upper part of the rotating main body, but the total area of the windows is smaller than the total area of the rotating main body. In addition, it is not sufficient to confirm the above, and it is difficult to say that a sufficient amount of air can be supplied to the inside of the rotating body board and the dust can be efficiently discharged to the outside of the rotating body board.

  Therefore, the present invention provides a grinding disk that can be operated while easily checking the state of the surface to be ground during the grinding operation, and that can efficiently grind and chamfer the surface to be ground such as concrete or stone. Objective.

In order to achieve the above-mentioned object, a grinding disk according to the present invention has a rotating main body plate having a plurality of inclined wall portions with windows and cast and a substantially radial arrangement on the back surface of the rotating main body plate. by a plurality of arc-shaped tip portions, provided with an arc-shaped tip portions of the plurality of, such that the edge side of the rotating direction of the rotating body panel is concave, arranged to Rutotomoni, each The arc-shaped tip portion is disposed so that the outer side of the tip portion is inclined 20 ° to 50 ° in the rotational direction side with respect to a radial imaginary line passing through the center of the rotating main body board, and The total area of the upper edges of the plurality of window portions of the inclined wall portion of the rotating main body board is relative to the virtual total area of the upper surface of the inclined wall portion and the total area of the upper edges of the plurality of window portions. 50% to 80% .

In addition, a rotating main body plate having a plurality of inclined wall portions with windows and cast-molded by the lost wax method, and a plurality of arc-shaped chip portions disposed substantially radially on the back surface of the rotating main body plate, includes a arcuate tip portion of said plurality of, as the edge sides of the rotational direction of the rotating body panel is concave, while being arranged, each of said arc-shaped tip portion, said tip portion Are arranged so as to be inclined 20 ° to 50 ° in the rotational direction side with respect to a radial imaginary line passing through the center of the rotating main body board , and further, a plurality of inclined wall portions of the rotating main body board are arranged. The total area of the upper edge of the window portion is 50% to 80% with respect to the virtual total area of the upper surface of the inclined wall portion and the total area of the upper edges of the plurality of window portions .

  The present invention has the following remarkable effects.

A complicatedly shaped window portion can be easily and accurately cast on the rotating main body board.
Further, the arc-shaped tip portion can efficiently level the surface to be ground (such as concrete or stone), chamfer, or the like.
Furthermore, since the grinding operation can be performed while checking the condition of the surface to be ground with the window while the disk is rotating, the work efficiency is further improved, and air flows into the inside of the rotating main body through each window. Therefore, the discharge of dust is promoted.
And since the space | interval dimension of an adjacent chip | tip part is large, dust is easy to be discharged | emitted to the radial direction outer side of a grinding disk, and grinding efficiency improves further.

As shown in FIG. 1, the grinding power tool 12 according to the present invention is used for leveling, chamfering, stripping the painted surface, etc. of the surface 8 to be ground such as concrete, building material or stone in construction work or civil engineering work site. Grinding is performed by pressing a grinding disk 10 that can rotate at high speed against the surface 8 to be ground.
1, 2, 3, 4, and 5, a grinding disk 10 is fixed to a rotating shaft rod (not shown) of a grinding power tool 12 and rotates. It comprises a plurality of arc-shaped chip portions 2... Brazed to the back surface 11 of the board 1. The rotary body board 1 has a plurality of inclined wall portions 3 with window portions 4... And is molded by the lost wax method or other precision casting methods. And the chip | tip part 2 ... is arrange | positioned substantially radially.
The tip portions 2 are made of a sintered body of diamond abrasive grains and an alloy.

Specifically, the rotary body board 1 is formed by integrally casting a substantially truncated cone-shaped upper portion 5 and a flange portion 6 disposed on a lower side portion of the substantially truncated cone-shaped upper portion 5. is there.
The upper portion 5 is composed of the inclined wall portion 3 and the upper wall surface portion.
A mounting hole 9 is formed in the center of the upper wall surface of the upper part 5 so that the grinding disk 10 can be fixedly removed from the rotary shaft (of the grinding power tool 12).

Each of the arcuate chip portions 2... Has a back surface 5a of the upper portion 5 of the rotating main body plate 1 and a back surface 6a of the flange portion 6 so that the edge side portion 2a on the rotating direction side (of the rotating main body plate 1) is concave. In addition, they are attached (projected) by brazing, laser welding, or an integral sintering method.
Each tip portion 2 is arranged so that the outer side 20 of the tip portion 2 is inclined at a predetermined angle β to the rotational direction side with respect to a radial imaginary line L passing through the center of the rotating body board 1. ing.
The predetermined angle β is preferably 20 ° to 50 °, and if it is less than 20 °, dust (such as concrete) ground by the edge side 2a of the tip portion 2 is difficult to be discharged outward in the radial direction. .
On the other hand, if it exceeds 50 °, the area that can be ground in one rotation of the tip portion 2 becomes small, and the grinding efficiency is lowered, which is inconvenient.

More specifically, the chip part 2 is brazed so that a part of the rear side part 2b of the chip part 2 is along the front part (relative to the rotation direction) below the inner surface 4a of each window part 4, and A part of the edge side part 2a (on the front side) of the adjacent rear chip part 2 is brazed so as to follow the rear part below the inner surface 4a of the window part 4 (see FIG. 3).
Moreover, the upper part of the inner surface 4a of each window part 4 ... is cast-molded to the vicinity of the substantially upper end of the inclined wall part 3, and each window part 4 ... is inclined in the direction opposite to the rotation direction from the lower side to the upper side. As an elongated shape.

Further, the total area of the plurality of window portions 4 of the inclined wall portion 3 of the rotary main body board 1 is 50% to 80% with respect to the total area of the inclined wall portion 3.
Here, the total area of the inclined wall portion 3 is the virtual total area obtained by combining the upper surface 3a of the inclined wall portion 3 (where the window portions 4 are not penetrated) and the total area of the window portions 4. It is defined as
That is, the ratio of the total area of the window portions 4 of the inclined wall portion 3 to the virtual total area of the inclined wall portion 3 is set to 50% to 80%.
If this ratio is less than 50%, it is insufficient to see (confirm) the grinding condition of the surface to be ground 8 during the grinding operation, and a sufficient amount of air is supplied to the rotary main body 1 and the surface to be ground. It is difficult to say that the dust can be supplied during the period 8, and dust (such as concrete or stone) ground by the tip portion 2 cannot be efficiently discharged radially outward of the grinding disk 10.
On the other hand, if it exceeds 80%, the strength of the inclined wall portion 3 of the rotary main body board 1 is lowered, and there is a possibility that it will be damaged if used repeatedly.

1 to 5, the grinding tool 10 including the grinding disk 10 having the above-described configuration is used to press the tip 2 of the grinding disk 10 against the surface 8 to be ground (such as concrete or stone). , Grinding.
The grinding disk 10 rotates in the direction of the arrow 13 in each figure, the edge sides 2a of the chip portions 2 ... grind the surface 8 to be ground, and dust (such as concrete) Between the back surface 6a of the portion 6 and the surface 8 to be ground, the air is discharged radially outward as indicated by an arrow 15 from between the tip portions 2.
At this time, the air flows through the windows 4... As indicated by the arrow 14, flows into the rotary main body board 1, and flows out as indicated by the arrow 15.

  Further, since the grinding disk 10 rotates at a high speed during the grinding operation, all the window portions 4 can be seen through in an annular shape by the afterimage action of the eyes (substantially seen through almost the entire inclined wall portion 3). The grinding condition of the surface 8 to be ground can be confirmed.

As described above, the rotary main body plate 1 having the inclined wall portion 3 with the plurality of window portions 4 and cast-molded, and the plurality of arc-shaped chips disposed substantially radially on the back surface 11 of the rotary main body plate 1. And the plurality of arc-shaped chip portions 2 are disposed such that the edge side portion 2a on the rotation direction side of the rotary main body board 1 is concave, such as concrete or stone. Flattening and chamfering of the ground surface 8 can be performed efficiently. Further, since the grinding can be performed while confirming the condition of the surface 8 to be ground by the window 4, the working efficiency is further improved, and air passes through each of the windows 4. It flows in and the discharge of dust to the outside in the radial direction is promoted. And since the space | interval dimension of the adjacent chip | tip parts 2 and 2 is large, dust, such as ground concrete, is easy to be discharged | emitted to the radial direction outer side of a grinding disk, without collecting on the front side of the chip | tip part 2. FIG .

Each arcuate chip portion 2 has an outer side 20 of the tip portion 2 that is 20 ° to 50 ° (predetermined angle β) in the rotational direction with respect to a radial imaginary line L that passes through the center of the rotating body board 1. Since it is arranged so as to incline, dust such as ground concrete is easily discharged radially outward without collecting on the front side of the tip portion 2 due to centrifugal force due to rotation, and the efficiency of the grinding work is improved. To rise.
Further, since the inclination (predetermined angle β) of each arcuate tip portion 2 is not too small, dust (such as concrete) ground by the edge side portion 2a of the tip portion 2 is discharged outward in the radial direction. Cheap.
Further, since the inclination (predetermined angle β) of each arcuate tip portion 2 is not too large, the area that can be ground in one rotation of the tip portion 2 is not reduced and the grinding efficiency is not lowered.

Further, the total area of the upper edges of the plurality of window portions 4 of the inclined wall portion 3 of the rotary main body 1 is a virtual sum of the upper surface 3 a of the inclined wall portion 3 and the total area of the upper edges of the plurality of window portions 4. Since it is 50% to 80% with respect to the total area, the work can be performed while observing (checking) the grinding condition of the surface 8 to be ground against which the rotary main body panel 1 is pressed, and the work efficiency is increased. To do.
Further, since a sufficient amount of air can be supplied between the rotary main body plate 1 and the surface 8 to be ground through the window portion 4..., Dust (such as concrete or stone) ground by the tip portion 2 can be used as the rotary main body plate 1. Can be efficiently discharged radially outward.
Moreover, since the strength of the rotating main body panel 1 is not impaired, it is not easily damaged even when used repeatedly, and it is convenient.

Further, since the rotary main body 1 is cast and molded by the lost wax method, the window portion 4 having a complicated shape can be easily cast into an accurate shape.

Although not shown, the grinding disk 10 can be freely changed in design as described below.
That is, as compared with the embodiment shown in FIGS. 3 and 4, each arcuate chip portion 2..., A radial imaginary line L passing the outer side 20 of the chip portion 2 through the center of the rotary main body board 1. It is a point arrange | positioned so that it may incline by the predetermined angle (beta) to the rotation direction reverse side.
In addition, each chip | tip part 2 ... is arrange | positioned so that the edge side part 2a by the side of the rotation direction of the rotation main body board 1 may become concave shape similarly to the rotation main body board 1 shown in FIGS.
With this configuration, when the grinding disk 10 is rotated as indicated by the arrow 13, the edge side portion 2a of the arc-shaped tip portion 2... Easily scrapes the ground dust radially outward. ─High dust scraping performance───Dust is less likely to accumulate on the front side of the tip part 2, so that the efficiency of the grinding work is increased.

It is a perspective view which shows the use condition of one Embodiment of the grinding disk which concerns on this invention. It is a perspective view of a grinding disk. It is a top view. It is a bottom view. It is a side view.

Explanation of symbols

1 Rotating body board 2 Chip part
2a Edge side 3 Inclined wall
3a Upper surface 4 Window
10 Grinding disc
11 Back side
20 Outer side β Predetermined angle L Radial direction imaginary line

Claims (2)

A rotary main body plate (1) provided with an inclined wall portion (3) with a plurality of window portions (4) and cast and disposed substantially radially on the back surface (11) of the rotary main body plate (1). A plurality of arc-shaped tip portions (2),
Arcuate tip portion of the plurality of (2), as the edge sides of the rotational direction of the rotating body panel (1) (2a) is concave, arranged to Rutotomoni, each said arc-shaped tip The part (2) is 20 ° to 50 ° on the outer side (20) of the tip part (2) on the rotational direction side with respect to the radial imaginary line (L) passing through the center of the rotating body board (1). Arranged to tilt,
Further, the total area of the upper edges of the plurality of window portions (4) of the inclined wall portion (3) of the rotating main body board (1) is the upper surface (3a) of the inclined wall portion (3) and the plurality of windows. A grinding disk, characterized in that it is 50% to 80% of the virtual total area including the total area of the upper edge of the part (4) . A rotating main body plate (1) having an inclined wall portion (3) with a plurality of window portions (4) and cast and formed by the lost wax method, and a rear surface (11) of the rotating main body plate (1) substantially radially. A plurality of arcuate chip portions (2) disposed,
The plurality of arc-shaped tip portions (2) are arranged so that the edge side portion (2a) on the rotation direction side of the rotary main body plate (1) is concave, and each of the arc-shaped tips is provided. part (2) is, 20 ° to 50 ° in the rotational direction outer side (20) radial imaginary line through the center of the rotating body panel (1) with respect to (L) of the tip portion (2) Arranged to tilt ,
Further, the total area of the upper edges of the plurality of window portions (4) of the inclined wall portion (3) of the rotating main body board (1) is the upper surface (3a) of the inclined wall portion (3) and the plurality of windows. A grinding disk , characterized in that it is 50% to 80% of the virtual total area including the total area of the upper edge of the part (4) .

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