JP3998648B2 - Cup type rotating grindstone - Google Patents

Description

  The present invention relates to a cup-type rotary grindstone used for grinding stones, concrete, bricks, iron-based materials and the like, and in particular, a cup-type rotary grindstone suitable for grinding a material to be ground whose elastic material is coated on these hard materials About.

  Cup-type rotary whetstones are widely used for grinding highly brittle materials such as stone, concrete and brick. The basic structure of a cup-type rotating grindstone is that an abrasive layer is provided intermittently or continuously along the outer periphery of a cup-type substrate. Surface grinding is carried out in sliding contact with the surface.

  The rotating grindstone provided with the abrasive layer intermittently along the outer peripheral edge of the cup-type substrate is good in discharging chips from between the intermittent abrasive layers and is not easily clogged. Further, since the contact area with the material to be ground is small, there is an advantage that the abrasive layer bites into the material to be ground and the sharpness is excellent. On the other hand, it also has the disadvantages of large vibration during grinding, large chipping, and rough surface.

  In the rotating grindstone in which the abrasive layer is continuously provided along the outer peripheral edge of the cup-shaped substrate, since the continuous abrasive layer contacts the workpiece, there is less vibration during grinding and less chipping. Furthermore, the ground surface roughness is fine and the surface accuracy is good. On the other hand, since the discharge of chips is bad, clogging is likely to occur, and because the contact area with the material to be ground is large, grinding burn is likely to occur, the biting into the material to be ground of the grindstone is poor and the sharpness is poor, It also has the disadvantage that it is difficult to supply grinding fluid and cooling air.

  In these rotary whetstones, the abrasive grains forming the abrasive layer include A-based abrasive grains mainly composed of alumina oxide, C-based abrasive grains mainly composed of silicon carbide (SiC), diamond abrasive grains, CBN ( Super abrasive grains such as (cubic boron nitride) abrasive grains are used depending on the material and grinding conditions of the workpiece.

  The present inventors have also made various improvements with respect to the cup-type rotary grindstone. For example, Patent Document 1 describes that a through hole is provided on a substrate to improve chip discharge, and during grinding, Japanese Patent Application Laid-Open No. H10-228688 describes that which suppresses the generation of vibration and noise.

FIG. 3 shows an example of a cup-type grindstone that is used when grinding is performed using a concrete or the like as a base and an elastic film attached thereto as an object to be ground.
FIG. 3 shows a state where the cup-type rotary grindstone grinds the concrete 31 coated with the elastic film 32. In FIG. 3A, the flat portion 11a of the substrate 11 of the cup-type rotary grindstone is shown. A PCD chip 21 suitable for cutting the elastic film 32 is attached to the bottom surface. Instead of the PCD chip 21, a PCBN chip or a cemented carbide chip may be used.
However, since PCD, PCBN, and cemented carbide are all sintered bodies, they are vulnerable to impact, and when they come into contact with the concrete 31, wear is significant, and chip scattering and chip cracking occur. This is particularly likely to occur when the elastic film 32 is a thin film.

On the other hand, as shown in FIG. 3B, it is also conceivable that the abrasive grains 22 are fixed to the bottom surface of the flat portion 11a of the substrate 11 of the cup-type rotating grindstone 10 by electrodeposition or the like.
However, in this case, although it is strong against impact, the protruding amount of the abrasive grains 22 is small, so that it is not suitable for peeling of the elastic film 32. When the elastic film 32 is thick, it takes a long time for processing. Occurs.
Examples of grinding tools having blade portions having different properties are described in Patent Literature 3, Patent Literature 4, Patent Literature 5, and Patent Literature 6.

JP 2000-84858 A JP 2002-239913 A JP 2001-198719 A Japanese Patent Laid-Open No. 2002-239827 JP 2003-200352 A JP 2003-300168 A

  Among them, the one described in Patent Document 3 is a milling machine using a hard sintered body and diamond abrasive grains, provided with an inclined portion on the end face of a cup-shaped base metal, and provided with a hard sintered body on the inclined portion. It is a tool, and makes it possible to perform heavy grinding and finish grinding simultaneously, and is not of a structure suitable for grinding concrete coated with an elastic film.

  Moreover, the thing of patent document 4 is a composite tool which provided the milling blade in the grindstone which consists of an abrasive grain, attached the hard sintered compact to the inner peripheral part, and provided the level | step difference with respect to this hard sintered compact Abrasive grains are arranged on the surface. In this composite tool, since the abrasive layer is on the outer peripheral side and the hard part is on the inner peripheral side, when the elastic body is processed using this composite tool, a sharpness defect due to burning occurs on the abrasive layer side, and the hard part However, the hard layer chipping occurs when it hits the concrete of the elastic base.

  Moreover, the thing of patent document 5 WHEREIN: In the electrodeposition tool which fixed the abrasive grain by the electrodeposition method to the outer peripheral surface and end surface of a cylindrical base metal, or the outer peripheral surface and side surface of a disk-shaped base metal, This is an electrodeposition tool in which an abrasion-resistant member is disposed on a ridge that is a boundary between an outer peripheral surface and an end surface or a boundary between an outer peripheral surface and a side surface of a disk-shaped base metal. In this electrodeposition tool, since the hard layer is on the outer peripheral part and the edge of the end face, when grinding concrete coated with an elastic film using this tool, the hard part hits the base concrete of the elastic body, etc. Hard layer chipping occurs.

Moreover, the thing of patent document 6 is comprised with the grindstone to which the rotation radial direction inner side part of the blade edge combined the abrasive grain with the metal binder, and the rotation radial direction outer side part of the blade edge | tip is a sintered body harder than a grindstone. It is the rotary tool comprised. In this rotary tool, since the hard layer and the abrasive layer are on the same surface, when the concrete coated with an elastic film is ground using this tool, the hard part hits the concrete of the elastic base and the hard layer. Chipping occurs. Moreover, since it is an abrasive material layer using a metal binder, a sufficient amount of abrasive material protrusion cannot be obtained, and scoring occurs, resulting in poor sharpness.
Thus, the conventional tool cannot suitably grind the concrete coated with the elastic film.

  The present invention has been made to solve such problems, and an object of the present invention is to provide a cup-type rotary grindstone that can efficiently peel an elastic film, is resistant to impact, and has high wear resistance. And

In order to solve the above-mentioned problems, the present invention provides a cup used when grinding using a hard material made of any one of stone, concrete, or brick and coated with an elastic film as a material to be ground. An elastic film peeling chip coated with the hard material is formed and attached to an outer peripheral end surface of an outer peripheral side flat portion of the cup type substrate by a sintered body, and the cup type substrate A cup-type rotary grindstone characterized in that an abrasive grain layer formed by adhering abrasive grains for grinding the hard material is formed on the bottom surface of the outer peripheral flat portion.

  In a region where the elastic film peeling chip attached to the outer peripheral end surface of the outer peripheral flat part of the cup type substrate acts on the elastic film to release the elastic film, the outer peripheral side flat part of the cup type substrate is removed. Abrasive grain layer formed on the bottom surface acts on a hard material such as concrete as a base for grinding.

  Since the tip for peeling the elastic film is formed of a sintered body, the elastic film can be peeled off efficiently without causing clogging, and the abrasive layer made by adhering abrasive grains is strong against impact and has excellent wear resistance. Therefore, hard concrete can be ground appropriately. Therefore, even when a composite material made of materials having different properties such as concrete and an elastic film is used as a material to be ground, it is possible to perform efficient grinding while maintaining wear resistance.

  In the present invention, the elastic film peeling chip is preferably made of PCD, PCBN or cemented carbide. By forming the elastic film peeling tip with these materials, the elastic film can be peeled efficiently.

  In the present invention, the abrasive grain layer is formed by arranging abrasive grains made of diamond, CBN or the like in a single layer or in a layer form. Since the abrasive grain layer formed of these abrasive grains is resistant to impact, it is suitable for grinding hard materials such as concrete, and a cup-type rotating grindstone with high wear resistance can be realized.

According to the present invention, an elastic film peeling chip coated on a hard material made of any one of stone, concrete, or brick is formed on the outer peripheral end surface of the outer peripheral flat portion of the cup-type substrate by a sintered body. In addition to being attached to the bottom surface of the outer peripheral side flat portion of the cup-type substrate, an abrasive layer formed by adhering abrasive grains for the hard material grinding is formed on a hard material such as concrete. Even when grinding a material to be ground coated with an elastic film, it is possible to efficiently peel and grind the elastic film while maintaining wear resistance.

Hereinafter, a cup-type rotary grindstone according to an embodiment of the present invention will be described.
1A and 1B are diagrams showing a cup-type rotary grindstone according to an embodiment of the present invention. FIG. 1A is a front view, and FIG. 1B is a cross-sectional view of FIG.
In the cup-type rotary grindstone 10 shown in FIG. 1, the substrate 11 is a cup-shaped 3 mm-thick steel plate formed by press drawing and has a mounting hole 11b for mounting on the rotating shaft of the electric tool at the center of the bottom. Is provided. The outer diameter of the substrate 11 is 100 mm.
On the bottom surface of the flat portion 11a on the outer peripheral side of the cup-type substrate 11, an abrasive grain layer 13 is formed by adhering abrasive grains 12 made of diamond or the like by brazing. An elastic film peeling chip 14 is attached to the outer peripheral end surface of the flat portion 11 a on the outer peripheral side of the cup-shaped substrate 11. The elastic film peeling chip 14 can be formed using PCD, PCBN, or cemented carbide. The substrate 11 is provided with a through hole 11c for collecting dust at a portion of the flat portion 11a that is not the abrasive grain layer 13.

FIG. 2 shows details of the processed surface of the cup-type rotary grindstone according to the embodiment of the present invention.
In FIG. 2A, an elastic film peeling tip 14 is attached to the outer peripheral end face of the flat portion 11 a of the substrate 11 of the cup-type rotating grindstone 10. In addition, an abrasive layer 13 formed by adhering abrasive grains 12 made of diamond or the like to the bottom surface of the flat portion 11a of the substrate 11 by brazing is formed.

  FIG. 2B shows a state in which the concrete 31 whose surface is covered with the elastic film 32 is ground using the cup-type rotary grindstone 10. When a concrete 31 is used as a base and an elastic film 32 attached thereto is ground as an object to be ground, an elastic film peeling tip provided on the outer peripheral end surface of the flat portion 11a of the substrate 11 with respect to the elastic film 32 In the region where the elastic film 32 is peeled off, the abrasive grains 12 made of diamond or the like provided on the bottom surface of the flat portion 11a of the substrate 11 act on the concrete 31 which is the base. Since the elastic film peeling chip 14 is a chip formed of a sintered body, the elastic film 32 can be efficiently ground without causing clogging, and the abrasive layer 13 formed by adhering the abrasive grains 12 is subjected to an impact. Because it is strong and excellent in wear resistance, it is suitable for grinding hard concrete. The elastic film peeling chip 14 is attached to the substrate 11 with a level difference corresponding to the diameter of the abrasive grain 12 at the maximum from the grinding surface on which the abrasive grains 12 are arranged. There is no chipping in contact with the concrete 31.

  As described above, according to the cup-type rotary grindstone according to the embodiment of the present invention, the wear resistance is maintained even when the composite material made of materials having different properties such as the concrete 31 and the elastic film 32 is used as the material to be ground. In addition, the elastic film can be efficiently peeled off.

In order to confirm the processing performance of the cup-type rotary grindstone of the present invention described above, the conventional product 1 in which the PCD chip is attached to the bottom surface of the flat portion 11a of the cup-type rotary grindstone substrate 11 and the cup-type rotary grindstone substrate 11 A test was conducted in which the comparison product was a conventional product 2 in which abrasive grains were fixed to the bottom surface of the flat portion 11a by electrodeposition. The result is shown in FIG.
FIG. 4A shows the processing efficiency, and the processing efficiency of the invention is displayed as 100. Here, the processing efficiency is defined as the peeled area of the elastic film per unit time. Although the conventional product 1 has the same processing efficiency as the invention product, the conventional product 2 has a significantly reduced processing efficiency. This is because the protruding amount of the abrasive grains is small, which is not suitable for peeling of the elastic film, and a long time is required for processing.
FIG. 4B shows the life, and the life of the invention product is indicated as 100. Although the conventional product 2 has the same life as the invention product, the conventional product 1 has a significantly reduced life. This is because PCD chips are vulnerable to impact and wear significantly when in contact with concrete.
From the above results, it is demonstrated that the cup-type rotary grindstone of the present invention is excellent in both processing efficiency and life.

  INDUSTRIAL APPLICABILITY The present invention can be used as a cup-type rotary grindstone suitable for grinding a composite material in which an elastic film is coated on a hard material such as concrete.

It is a figure which shows the cup type rotary grindstone which concerns on embodiment of this invention. It is a figure which shows the detail of the processed surface of the cup type rotary grindstone which concerns on embodiment of this invention. It is a figure which shows a mode that the concrete with which the elastic film was coated is ground with the conventional cup type rotary grindstone. It is a figure which shows a test result.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Cup-type rotary grindstone 11 Substrate 11a Flat part 11b Mounting hole 11c Through-hole 12 Abrasive grain 13 Abrasive grain layer 14 Elastic film peeling chip 21 PCD chip 22 Abrasive grain 31 Concrete 32 Elastic film

Claims (3)

A cup-type rotary grindstone used when grinding using a hard material made of any one of stone, concrete, or brick and coated with an elastic film as a material to be ground, the coating on the hard material The formed elastic film peeling tip is formed and attached to the outer peripheral end surface of the outer peripheral side flat portion of the cup type substrate by a sintered body, and the hard material grinding is applied to the bottom surface of the outer peripheral side flat portion of the cup type substrate. of use, the cup-type grinding wheel, characterized in that the abrasive grain layer formed by fixing the abrasive grains are formed.   The cup-type rotary grindstone according to claim 1, wherein the elastic film peeling tip is made of PCD, PCBN, or cemented carbide.   2. The cup-type rotary grindstone according to claim 1, wherein the abrasive grain layer is formed by arranging abrasive grains made of diamond, CBN, or the like in a single layer or a layer.

Images