JPH10264037A - Diamond wheel for chamfering - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a diamond wheel for chamfering which can chamfer the most suitably for the joint for preventing the generation of a crack provided on the paved surface of concrete and asphalt and a ditch for preventing a slip provided on a road. SOLUTION: A copying surface 2e having an outline shape for crossing with its axis and astoringenting to a taper shape facing to an outer periphery edge side is formed on one part of a stock metal 2 and also a diamond abrasive grain layer 3 is joined to this copying surface 2e and a thick guide 2d which is slightly smaller than the opening width of the joint or ditch is developed as a ring body on the more outer periphery side than the copying surface 2e and the diamond abrasive grain layer can be cut by this guide 2d, while slidecontacting to the opening edge of the joint or ditch properly.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of forming a groove at the upper end of a groove for preventing cracks from being formed on a concrete casting surface or an asphalt pavement surface of a factory, a store or a parking lot. The present invention relates to a chamfering diamond wheel for chamfering.

[0002]

2. Description of the Related Art For example, when treads of factories, stores, warehouses, parking lots and the like inside and outside are cast and constructed with concrete, cracks or cracks often occur due to shrinkage of the concrete due to temperature fluctuation. Conventionally, in order to prevent such cracks, construction has been performed so that thermal stress on the casting surface is released by cutting grooves along the concrete casting surface at regular intervals and cutting off joints. ing. Such a joint cut is similarly applied to asphalt pavement.

[0003] Also, in a tunnel of an expressway or a runway of an airfield, construction is performed in which a large number of grooves are cut to prevent tire slip. This has a different purpose from the prevention of the occurrence of cracks, but is exactly the same as the joint cutting on the tread surface for the purpose of preventing the occurrence of cracks in that a large number of grooves are formed.

Conventionally, such joints for preventing the occurrence of cracks and grooves for preventing slipping are formed in a manner of slitting by a high-speed rotation of a disk-shaped cutter or a segment cutter. For this reason, the joint groove and the anti-slip groove both have an opening edge at the upper end substantially perpendicular to the tread surface and have a sharp cross-sectional shape.

[0005] However, if the corner between the groove and the tread is sharp as described above, in a factory or a warehouse, for example, frequent running of a forklift or the like tends to cause the corner to chip off, and the chipped piece becomes dusty. It worsens the environment in factories and warehouses. Grooves on roads and runways are also likely to be chipped by the impact of vehicles and airplane tires, and in this case, there is a problem that the slip prevention effect is reduced.

[0006] In order to prevent the occurrence of chipping at the corners of the groove, chamfering has been conventionally performed at the same time as the joint or the groove is cut. In this method, a diamond sintered tip for chamfering is annularly brazed around the center of rotation on the side surface of a cutting blade. When such a cutting blade is used, the corner of the upper end of the groove can be chamfered with the diamond sintered tip simultaneously with the cutting of the groove by the blade.

[0007]

However, in the case where joints and grooves are cut by a cutting blade and chamfering is performed at the same time, the cutting blade receives cutting resistance when cutting the groove, so that the cutting blade and the groove are cut in the axial direction. Often accompanied by blurring and vibration. If the cutting force fluctuates sharply or the level of vibration repeats, chattering will occur, and the axis of the cutting blade will not be kept perpendicular to the cutting groove. The operation of tilting the cutting blade is repeated.

[0008] When the cutting blade tilts in this manner, the chamfer angle of the diamond sintered tip provided on the side surface of the cutting blade also fluctuates. Do not match or meander in a meandering manner, which significantly degrades the appearance. Also, if the angle of inclination of the chamfered portion is small, the angle between the tread surface and the tread will be sharp, and the chamfering angle will be insufficient, and the effect of chamfering will be reduced.

[0009] Further, the diamond sintered chip provided on the side surface of the cutting blade for chamfering is worn as the cutting process proceeds, so that the shape of the chip itself tends to be lost. Therefore, even in the case where the cutting blade is configured to have a buffering function so as not to cause blurring and chatter vibration, the chamfering angle varies due to the groove of the construction surface due to the shape deformation of the chip. .

As described above, if grooving and chamfering are performed simultaneously with a single cutting blade, the processing accuracy of chamfering tends to be poor, and the effect of preventing cracks and preventing tire slip is reduced. There is a problem.

An object of the present invention is to provide a diamond wheel for chamfering which can optimally chamfer a groove for preventing cracks provided on a concrete or asphalt casting surface and a groove for preventing slips provided on a road or the like. And

[0012]

SUMMARY OF THE INVENTION A diamond wheel for chamfering according to the present invention is formed on at least one surface near an outer peripheral edge of a disk-shaped base metal and has an inclination angle crossing an axis of the base metal. A profiling surface, a diamond abrasive layer bonded to the profiling surface, and a guide that is developed and arranged continuously from an outer peripheral edge of the profiling surface and has a surface facing the side on which the profiling surface is formed, and a flat surface orthogonal to the axis of the base metal. And a part.

In this configuration, when the copying surface is provided only on one surface of the base metal, if the guide portion is applied to a peripheral wall along the outer peripheral edge of, for example, a concrete lump, the diamond abrasive layer bonded to the copying surface is provided. Thereby, the corners of the concrete block can be chamfered.

[0014] Also, a diamond wheel which is suitable for chamfering an opening edge of a joint or a groove is a diamond wheel having a uniform opening width and a chamfered side opposite to an opening edge of the joint or the groove. In the vicinity of the outer peripheral edge of the plate-shaped base metal, a pair of copying surfaces having a cross-sectional shape formed on both surfaces and converging in a tapered shape toward the outer peripheral direction, a diamond abrasive grain layer joined to this copying surface, and a pair of A guide portion which is developed and arranged in series with each outer peripheral edge of the copying surface and faces a side on which these copying surfaces are formed, and which has a flat surface orthogonal to the axis of the base metal, and a radial length of the guide portion. May be configured to be shorter than the depth of the joint or the groove and to have the wall thickness slightly smaller than the opening width.

With this configuration, when the guide portion is inserted into the joint or the groove, the diamond abrasive layer on the profiling surface converging in a tapered shape is brought into contact with the opening edge of the joint or the groove. When the diamond wheel rotates, the guide portion thereof is guided in the direction of cutting the joints or grooves, so that the diamond abrasive layer can be chamfered without hitting any opening edge.

In a preferred configuration for chamfering joints or grooves according to the present invention, the guide portion may be formed integrally with the base. In this case, since the guide portion can be manufactured at the same time when the base metal is manufactured, the positional relationship between the guide portion and the copying surface and the processing accuracy can be kept good.

Further, the base metal is a disk-shaped main material having a thickness slightly smaller than the opening width of the joint or the groove, and a coaxial shape having a smaller diameter than the main material and at least one surface thereof. It may be configured as a laminated body with the arranged holding material, and the difference in radius between the main material and the holding material is shorter than the depth of the joint or the groove, and the copying surface may be formed on the outer peripheral edge. .

In the case where the base metal is constituted by such a plurality of members, even when the main material is deformed or broken, for example, only the main material needs to be exchanged.
The holding material to which the expensive diamond abrasive grains are bonded can be continuously used without discarding.

Further, in the present invention, the diamond abrasive layer may be formed by forming the diamond abrasive as a single layer or a multi-layer by any one of an electroplating method, an electroless plating method, and a metal brazing method. it can. With such a method of joining the diamond abrasive layer to the contoured surface, for example, as compared with cutters using a diamond sintered tip, shape deformation is effectively prevented, and the cutting life is greatly improved.

[0020]

FIG. 1 is a front view of a diamond wheel for chamfering according to the present invention as viewed in the axial direction thereof, and FIG.
FIG. 3 is an enlarged longitudinal sectional view showing a main part.

In the figure, a diamond wheel 1
A disk-shaped base metal 2 made of an iron-based alloy such as steel is connected to a driving device to be rotatable. The base 2 is provided with a mounting hole 2a at the center thereof, through which the output shaft of the drive unit passes, and a base 2c is formed around the mounting hole 2a. Around the base 2c, an annular guide 2d that is inserted into joints or grooves and functions as a guide is provided in a cross-sectional shape having a uniform thickness in the radial direction.

As shown in an enlarged scale in FIG.
Between the c and the guide 2d, there is provided a chamfered copying surface 2e formed by the difference in thickness between the respective members. In the illustrated example, the copying surface 2e is formed as a tapered surface having an inclination of approximately 45 ° with respect to the axis of the base 2, but the angle of the copying surface 2e is changed according to the chamfering operation. 2 can be freely changed when it is manufactured.

On the surface of the copying surface 2e, a diamond abrasive layer 3 is provided. This diamond abrasive layer 3 is formed by bonding superabrasive grains of diamond to the surface of the base metal 2 by electroplating, electroless plating or metal brazing, similarly to a conventionally known diamond wheel. It was done. The diamond abrasive grain layer 3 bonded to the copying surface 2e by these methods may be either a single layer formed by one layer or a multilayer in which a plurality of layers are stacked.

The diamond wheel 1 having the above-described guide 2d in the outer peripheral portion and having the diamond abrasive layer 3 formed on the copying surface 2e has an outer diameter of 100 to 150.
By setting the diameter to about mm, it can be used like a hand-held grinder, or attached to a cart that can be moved by hand on a construction surface, for example.

FIG. 3 is a schematic view showing an example of use as a grinder type. An output shaft 4a protruding laterally from a grinder main body 4 widely used for grinding and polishing of metals and stones is used as a base. The diamond wheel 1 is mounted on the grinder body 4 by being connected through the second mounting hole 2a. The output shaft 4a is connected to a motor 4b, and operates a switch (not shown) to move the grinder body 4 along the groove while holding the grip 4c with a hand, thereby performing chamfering. In addition, it is preferable to provide a cover A that covers the diamond wheel 1 in order to prevent scattering of cutting chips during the cutting operation.

The procedure of this chamfering operation is as follows. The guide shaft 2d is inserted into a joint 22 for preventing the occurrence of cracks or slipping, which has been previously cut in a concrete layer 21 such as a floor slab, and then the output shaft 4a is rotated. Body 4
Is moved in the direction of the joint 22.

That is, as shown in FIG. 4 (a), the guide 2d is placed in such a position that the guide 2d can be inserted into the joint 22, and the guide 2d is dropped into the joint 22 as shown in FIG. 4 (b). The diamond layer 3 on the surface 2e is a joint 22
At the top opening of the. Therefore, when the diamond wheel 1 is rotated at a high speed, the diamond layer 3 can cut two surfaces in the width direction of the opening portion,
As shown in FIG. 5, chamfers 22a and 22b having an inclination angle of 45 ° can be formed at the upper end of the joint 22.

The length of the guide 2d in the radial direction from the outer peripheral edge to the copying surface 2e is slightly shorter than the depth of the joint 22, and is 0.2 to 0.3 mm with respect to the thickness of the guide 2d.
The opening width of the joint 22 is set so as to provide a sufficient clearance. For example, in the illustrated example, the thickness of the guide portion 2d is 2.2 mm, the outer diameter is 125 mm, and the diameter at the intersection with the copying surface 2e is 91 mm.
The depth of d entering the joint 22 is 17 mm. Due to such a dimensional relationship, if the guide 2d is inserted into the joint 22 as shown in FIG.
Joints that occupy about 15% of 5 mm are joints 22
Buried inside, with a clearance of 0.2-0.3m
m, the guide 2d moves inside the joint 22 while being tightly fitted into the joint 22. Therefore,
The posture of the diamond wheel 1 is held by a guide 2d that rotates so as to slide on the inner peripheral wall of the joint 22, and keeps a rotation axis always orthogonal to the cutting direction of the joint 22 (vertical direction in FIG. 4). be able to.

As described above, while the guide 2 d is inserted into the joint 22 and guided, the rotation axis of the diamond wheel 1 is made perpendicular to the cutting direction of the joint 22 so that the chamfered portion 22 is formed.
Since a and 22b are cut, both of the chamfers 22a and 22b can be formed to have a 45 ° inclination angle as shown in FIG. Therefore,
Prevents meandering of the chamfered portions 22a and 22b and unevenness such that one of the chamfers is wide and the other is narrow, and has a good appearance and a small angle of the chamfer. As a result, it is possible to surely prevent the tread portion from being missing. Accordingly, construction can be performed in which both the joints for preventing cracks and the grooves for preventing slips can maintain their respective prevention functions sufficiently high.

In the case of the conventional chamfering using a sintered tip pasting cutter, the processing ability is limited to about 300 m.
With the diamond wheel of the present invention having the dimensions and shapes described above, the processing capacity could be increased to about 3000 m, which is about 10 times.

Also, in the diamond wheel 1 shown in FIGS. 1 to 3, the profiling surface 2e of the base metal 2 is formed around the center, and the profiling surface 2e is provided with the diamond abrasive grain layer 3 over the entire surface. Instead of this, the diamond abrasive grain layer 3 may be formed in a spot shape at intervals in the circumferential direction with respect to the copying surface 2e like a segment type.

FIG. 6 is a schematic perspective view showing an example in which the edge of a concrete layer or a lump is chamfered in place of joints or grooves, and FIG. 7 is a main part for showing the positional relationship of the diamond wheel 1 with respect to the site. FIG.

In this example, an adapter 4d is mounted on the output shaft 4a of the grinder main body 4 shown in FIG. 3 and the diamond wheel 1 is connected thereto, and a guide roller 5 is provided on each of the bottom of the grinder main body 4 and the adapter 4d. , 6 are only different from the configuration of the previous embodiment.

The guide roller 5 is rotatably supported by a hanger 5 a attached to the bottom of the grinder body 3, and its rotation axis is parallel to the axis of the diamond wheel 1. The guide roller 6 is rotatably held at the lower end of an arm 6b extending downward from a bracket 6a connected to the adapter 4d so as not to rotate integrally. The guide roller 6 and the arm 6 are arranged so that the axis of the guide roller 6 can be kept orthogonal to the rotation axis of the diamond wheel 1 without being affected by the rotational movement of the output shaft 4a rotating at high speed.
By increasing the weight of b, the guide roller 6 is always kept in the illustrated position even when the output shaft 4b rotates at high speed.

Here, the positional relationship between the guide rollers 5, 6 and the diamond wheel 1, as shown in FIG. 7, is such that the guide roller 5 is placed on the upper surface 23a of the concrete block 23 and at the same time the peripheral surface of the guide roller 6 is placed on the side surface 23b. , The diamond abrasive grain layer 3 on the copying surface 2 e on one side of the diamond wheel 1 comes into contact with the corner 23 c of the concrete block 23 (see FIG. 6).

If the guide rollers 5 and 6 are provided, the grinder body 4 can be pushed and moved by hand while always being parallel to the corner portion 23c and not changing its vertical position. Thus, the corner portion 23 is formed by the diamond abrasive layer 3 on the copying surface 2e.
c can be cut like a chamfered portion 22a as shown in FIG. 5, for example, and the entire periphery of the edge of the concrete block 23 can be chamfered. Therefore, it is possible to use not only the joints and the grooves but also the chamfering of the concrete block 23 and other decorative stone materials, so that the field of use can be expanded.

FIG. 8 is a schematic view showing an example in which the joint is chamfered by running a bogie instead of the hand-held grinder system.

The same diamond wheel 1 as shown in the previous example is connected to the side surface of the bogie 7 so as to be able to move up and down. The cart 7 has four wheels 7a disposed on the lower surface thereof. It is either a hand-operated type as a simple caster or a self-propelled type which is driven to rotate by a drive mechanism built in the cart 7. May be.

Inside the carriage 7, a drive 7b for rotating the diamond wheel 1 is provided, and a lifting drive 7c for vertically moving the diamond wheel 1 is arranged. The driving device 7b and the lifting / lowering driving device 7c connect the support shaft 1a connected to the diamond wheel 1 so that the diamond wheel 1
And the height can be adjusted.

In the case where the diamond wheel 1 is mounted on the carriage 7, the guide 2 d of the base 2 is dropped into the joint 22 by operating the lifting / lowering drive device 7 c, as in the case described with reference to FIG. By rotating and driving the diamond wheel 1 by the device 7b, chamfers 22a and 22b can be formed at the upper end of the joint 22 as shown in FIG.

As described above, the cart 7 may be manually driven or self-propelled, but in any case, the guide 2d of the diamond wheel 1 moves within the joint 22 as a guide, so that the cart 7 is As long as the weight does not become excessive, the guide 2d can be moved as a guide member. Therefore, it is not necessary to separately prepare a member for guiding the carriage 7, and the setup work at the construction site is simplified.

FIG. 9 is a longitudinal sectional view showing another embodiment of the diamond wheel. In this example, a member corresponding to the base metal 2 in the previous example is a combination of one disk-shaped main member 8 and a pair of holding members 9 and 10 arranged on both surfaces thereof,
These are integrally connected by bolts 11a and nuts 11b, and the main member 8 and the holding members 9, 10 are provided.
Is an annular body having a mounting hole for fixing it through the output shaft 4a. The holding members 9 and 10 are formed by bonding the diamond abrasive grain layer 12 to the copying surfaces 9a and 10a with the outer peripheral surface portions thereof being the copying surfaces 9a and 10a of approximately 45 ° taper surfaces. , 10 are formed as guides 8a to be inserted into joints.

Also in such a diamond wheel made of three members, by inserting the guide 8a of the main member 8 into the joint, favorable chamfering work can be performed as in the previous example. Even when the guide 8a is worn or broken, for example, only the main member 8 needs to be replaced, so that the holding members 9, 10 and the diamond abrasive layer 12 are not wasted. In addition, since the bonding of the diamond abrasive layer 12 to the copying surfaces 9a and 10a may be performed only on the holding members 9 and 10, the processing and the manufacturing are simplified.

[0044]

According to the present invention, the guide portion is provided as a part of the base metal, and the guide portion is used as a reference for the chamfering position, for example, in the outer peripheral surface of the work material or in the joint and the opening of the groove. By applying the diamond abrasive layer to the side surface, the diamond abrasive layer bonded to the profiling surface can be faced in a correct posture with respect to the surface to be machined, so that a construction having a uniform appearance with a uniform chamfer angle can be obtained. Also, by setting the chamfer angle to an appropriate size, it is possible to reliably prevent the opening edge from being lost when the chamfer angle is reduced, thereby preventing cracks from occurring and slipping on the road. The prevention effect can be maintained high.

[Brief description of the drawings]

FIG. 1 is a front view of a diamond wheel of the present invention as viewed in the axial direction.

FIG. 2 is an enlarged longitudinal sectional view showing a part of the diamond wheel of FIG. 1;

FIG. 3 is a perspective view showing a state in which a diamond wheel is mounted on a grinder main body and faces a joint.

FIGS. 4A and 4B are longitudinal cross-sectional views of a main part showing the construction of a joint by a diamond wheel, wherein FIG. 4A shows a state before the guide is inserted into the joint, and FIG. Show.

FIG. 5 is a longitudinal sectional view of a main part showing a shape of a chamfered portion that has been processed.

FIG. 6 is a perspective view showing a chamfer of a corner portion of a concrete block.

FIG. 7 is a cutaway front view showing a main part of the example of FIG. 6;

FIG. 8 is a perspective view of an example in which a diamond wheel is mounted on a cart.

FIG. 9 is a longitudinal sectional view showing an example in which a base of a diamond wheel is formed by superimposing three members.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Diamond wheel 1a Support shaft 2 Base 2c Base 2d Guide (guide part) 2e Copying surface 3 Diamond abrasive layer 4 Grinder main body 4a Output shaft 5, 6 Guide roller 7 Cart 7a Wheel 8 Main material 8a Guide (guide part) 9 , 10 Retaining material 9a, 10a Copying surface 11a Bolt 11b Nut 12 Diamond abrasive layer 21 Concrete layer 22 Joint 22a, 22b Chamfer

Claims (5)

[Claims] 1. A copying surface formed on at least one surface near an outer peripheral edge of a disk-shaped base metal and having an inclination angle crossing an axis of the base metal, and diamond abrasive grains bonded to the copying surface. A diamond wheel for chamfering, comprising: a layer; and a guide portion, which is arranged so as to extend from the outer peripheral edge of the copying surface and faces the side where the copying surface is formed, and has a flat surface orthogonal to the axis of the base metal. 2. A diamond wheel having a uniform opening width and chamfering a side opposite to an opening edge of a joint or a groove, wherein the diamond wheel is formed on both surfaces in the vicinity of an outer edge of a disk-shaped base metal, and is formed in an outer edge direction. A pair of profiling surfaces having a cross-sectional shape converging in a tapered shape, a diamond abrasive grain layer bonded to this profiling surface, and these profiling surfaces are deployed and arranged in series with respective outer peripheral edges of the pair of profiling surfaces. A guide portion having a flat surface facing the formed side perpendicular to the axis of the base metal, wherein the radial length of the guide portion is shorter than the depth of the joint or the groove and the thickness is smaller than the opening width. Diamond wheel for chamfering, which is smaller in size. 3. The diamond wheel for chamfering according to claim 1, wherein the guide portion is formed integrally with the base metal. 4. A disk-shaped main material having a thickness slightly smaller than an opening width of a joint or a groove, and a coaxial shape having a diameter smaller than the main material and at least one surface thereof. Claims: It is constituted as a laminated body with the arranged holding material, the difference in radius between the main material and the holding material is shorter than the depth of the joint or the groove, and the contour surface is formed on the outer peripheral edge. 3. The diamond wheel for chamfering according to 1 or 2. 5. The diamond abrasive grain layer according to claim 1, wherein the diamond abrasive grains are formed as a single layer or multiple layers by any one of an electroplating method, an electroless plating method, and a metal brazing method. Diamond wheel for chamfering as described in.