JPH11156729A - Grinding wheel possible to exchange tips - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an offset grinding wheel in which only grinding wheel tips can be attached or removed freely. SOLUTION: In an offset grinding wheel 5, plural shallow tip fitting grooves 3 or recessed parts for fitting tips are prepared on the surface of a base wheel 1 with the same shape as the conventional offset grinding wheel, and a grinding wheel tip 4 made of grinding particle layers at least on the surface is fitted just on the tip fitting grooves 3 or recessed parts for fitting tips, so that it can be attached or removed freely. A bolt is attached on the lower surface of the grinding wheel tip 4 to be fitted on the tip fitting grooves 3 or recessed parts for fitting tips, and the bolt is inserted into a through-hole drilled on the bottom of tip fitting grooves 3 or recessed parts for fitting tips and is tightened from the lower surface of the base wheel 1.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates mainly to an offset grinding wheel, and more particularly to a grinding wheel in which a grinding wheel tip is detachably replaceable.

[0002]

2. Description of the Related Art Conventional grinding wheels, such as cutting wheels and flat wheels,
Abrasive grains made of silicon carbide, sand and the like are compression-molded into a disk shape together with a binder, and then heat-treated to harden the binder to form a single piece. In addition, a grinding wheel using diamond abrasive grains or cubic boron nitride (CBN) abrasive grains is obtained by attaching diamond abrasive grains or the like to the surface of a metal grinding wheel.

[Problems to be solved by the invention]

[0003] The conventional diamond grinding wheels and CBN grinding wheels described above are excellent in the efficiency of grinding hard materials, but are extremely expensive, and when diamond abrasive grains or the like adhered to the surface of a metal grinding wheel fall off, the grinding wheel is distorted. The entire car must be discarded, which is wasteful. Diamond wheels are effective for grinding hard materials other than steel, but aluminum,
Grinding of soft metals such as copper and brass often causes clogging, deteriorates sharpness, burns diamonds due to frictional heat, and reduces the life of the grindstone.

Japanese Patent Application Laid-Open No. 49-132688 discloses that a relatively hard sector grinding member having a small pore volume (porosity) and a relatively soft sector grinding member having a large pore volume (porosity) are alternately arranged. It has been proposed to configure a grinding wheel to prevent clogging of the grinding wheel and increase grinding efficiency. A relatively hard fan-shaped grinding member having a small porosity,
A grinding wheel with a relatively large porosity and relatively soft fan-shaped grinding members arranged alternately, the soft and hard sector-shaped grinding members are each separately formed by molding and firing abrasive grains as segments, and then forming these. They are assembled in a disc shape by bonding them to each other alternately, and the manufacturing process is extremely complicated, the bonding strength between the fan-shaped segments is weak, and the bonding portion of the grinding wheel segments during grinding work There was a risk of chipping or breaking.

Accordingly, an object of the present invention is to provide a diamond wheel and a CBN wheel which can be used at low cost. It is a further object of the present invention to provide a grinding wheel having an excellent grinding speed, a long life and little clogging.

[0006]

In order to achieve the above object,
As a result of intensive research, the present inventor has found that a grinding wheel tip using diamond abrasive grains, CBN abrasive grains or the like is detachably fitted to the surface or periphery of a metal base wheel having substantially the same shape as a normal offset grinding wheel. By configuring the diamond wheel as a whole, when the grinding wheel chip is worn, only the tip part can be replaced and used, and the diamond wheel can be used inexpensively. By alternately arranging grinding wheels using diamond or CBN abrasives and grinding wheels using abrasives such as silicon carbide used in a normal grinding wheel, clogging of diamond grinding wheels and the like is extremely reduced. The inventors have found that the present invention can be performed, and have completed the present invention.

That is, according to the present invention, in an offset grinding wheel, a plurality of shallow chip fitting grooves or chip fitting recesses are provided on the surface of a base wheel having a shape substantially similar to that of a normal offset grinding wheel, and at least the surface has abrasive grains. The present invention provides a tip-replaceable grinding wheel characterized in that a grinding wheel tip made of a layer is fitted in the chip fitting groove or the chip fitting recess in a detachable manner.

Another aspect of the present invention is an offset grinding wheel,
A grinding ring in which super-abrasive grains such as diamond abrasive grains and CBN abrasive grains are fixed to a plurality of locations on the upper surface of a base wheel having a shape substantially similar to that of a normal offset grinding wheel is detachably mounted. The gist is a grinding wheel with replaceable tips.

BEST MODE FOR CARRYING OUT THE INVENTION

Next, the contents of the present invention will be described in detail with reference to the drawings. FIG. 1 is a plan view of an offset grinding wheel as an example of the grinding wheel of the present invention, FIG. 2 is a sectional view taken along the line AA, and FIG.
It is an expanded sectional view which follows B. Reference numeral 1 denotes a base wheel of the offset grinding wheel 5, which has substantially the same shape as a known offset grinding wheel. The base wheel 1 is made of a metal such as a light metal alloy, and has a radially shallow chip fitting groove 3 on its surface 2, and a grinding wheel chip 4 is removably fitted into the chip fitting groove 3.

The chip fitting groove 3 has a shallow and wide shape, and the circumferential cross section of the disk member 7 of the chip fitting groove 3 is a convex sectional shape or a dovetail groove as shown in FIG. The width W2 of the bottom surface is formed so as to be wider than the width W1 of the upper surface of the chip fitting groove 3. It is preferable that the width W1 of the chip fitting groove 3 is not constant, and is formed so that the width is slightly reduced from the radial center portion of the base wheel 1 toward the outside. The grinding wheel tip 4 fitted in the chip fitting groove 3 is formed to have the same cross-sectional shape as the inside sectional shape of the chip fitting groove 3, and is formed so that the width decreases toward the tip similarly to the chip fitting groove 3. I do. In order to fit the grinding wheel tip 4 into the chip fitting groove 3, it is necessary to slide the inside of the chip fitting groove 3 radially outward from the offset portion 8 at the center of the base wheel 1. it can. By forming the chip fitting groove 3 and the grinding wheel tip 4 in this manner, the grinding wheel tip 4 is fitted into the chip fitting groove 3 without falling off the chip fitting groove 3. When the grinding wheel is rotated, the centrifugal force acting on the grinding wheel tip 4 pushes the grinding wheel tip 4 outward in the radial direction where the width of the chip fitting groove 3 is narrow, and is tightly fixed in the chip fitting groove 3. Therefore, there is no vibration in the chip fitting groove 3 during the grinding operation.

A female screw 19 is provided on the inner peripheral portion 9 of the offset portion 8 of the base wheel 1, and a holding ring 10 having a male screw screwed onto the outer peripheral portion thereof is screwed onto the outer periphery thereof. It can be held so that it does not fall in the direction.

The chip fitting groove 3 may not be provided along the radial direction of the base wheel 1, but may be provided along a direction slightly oblique to the radial direction.

[0013] Instead of providing the holding ring 10,
As shown in the plan view of FIG. 4 and the cross-sectional view taken along the line CC of FIG. 5, the base vehicle 1 may be constituted by a center member 6 and a donut-shaped disk member 7 screwed to the periphery thereof. in this case,
A plurality of chip fitting grooves 3 are radially provided on the surface 2 of the disk member 7, and the grinding wheel chips 4 are fitted into the chip fitting grooves 3 having the same shape as described above. Pressing ring 10 and disk member 7
It is necessary to provide the screwing direction of the screw in the direction in which the screw is tightened by the rotation of the grinding wheel.

The method of removably attaching the grinding wheel tip 4 to the base wheel 1 is not limited to the method of fitting the grinding wheel tip 4 exactly into the radial tip fitting groove 3 as described above.
7 and a sectional view taken along line DD of FIG. 7, a shallow chip fitting recess 11 having an arbitrary planar shape is formed on the surface 2 of the base vehicle 1.
And a bolt 12 provided on the lower surface of the grinding wheel chip 4 with a grinding wheel chip 4 having the same shape as the shape of the chip fitting recess 11 is inserted into a through hole 13 provided on the bottom surface of the chip fitting recess 11. It is also possible to use a method of inserting and individually fastening the lower surface of the base wheel 1 with the nut 14 from the lower surface. Even when the grinding wheel tip 4 is fitted into the radial tip fitting groove 3,
Instead of using a dovetail or the like, the bolts 12 can be used for fastening as described above.

The number of grinding wheel chips 4 mounted on the base wheel 1 is not particularly limited, but is usually 2 depending on the size of the grinding wheel.
Up to eight can be provided. In a grinding wheel having a diameter of 100 mm, 2 to 5 grinding wheel chips 4 are preferably used.

The thickness of the grinding wheel tip 4 is appropriately selected according to the thickness of the base wheel 1. For example, in the case of an offset grinding wheel 5 having a diameter of 100 mm, the disk portion of the base wheel 1 having a thickness of 7 mm has a thickness of 4 mm. The grinding wheel tip 4 can be fitted. The thickness of the grinding wheel tip 4 is formed slightly thicker than the depth of the chip fitting groove 3, and when the grinding wheel tip 4 is fitted into the chip fitting groove 3, the grinding wheel tip 4 is removed from the surface 2 of the base wheel 1. It is preferred that they project slightly. The protrusion height is not particularly limited, but is preferably 0.3 to 1.0 mm because the protrusion height affects vibration during grinding.

The grinding wheel tip 4 electrodeposits super abrasive grains 20 such as diamond abrasive grains and CBN abrasive grains on a metal substrate 18.
What is fixed by a known bonding method such as a metal bond, a vitrified bond, and a resinoid bond is used, and the entire grinding wheel tip 4 is made of general abrasive grains made of fused alumina, silicon carbide, or the like, in the same manner as a known method of manufacturing a grinding wheel. And the like, which are manufactured by compression-molding and firing.

A grinding wheel tip 4 fitted in a plurality of chip fitting grooves 3 of the base wheel 1 of the wheel of the present invention.
May be fitted with the grinding wheel chips 4 of the same material, but may be fitted with the grinding wheel chips 4 of different materials.
The grinding wheel tip 4 using super-abrasive grains such as diamond abrasive grains or CBN abrasive grains can efficiently grind hard workpieces, but when grinding soft metals such as aluminum, brass and copper. Clogging is likely to occur and the grinding efficiency is significantly reduced. A plurality of chip fitting grooves 3 alternately include a grinding wheel chip 4 containing superabrasive grains and a grinding wheel chip 4 made of general abrasive grains such as alumina abrasive grains or silicon carbide abrasive grains, or a part of the chip fitting grooves 3. When the grinding wheel tip 4 made of general abrasive grains is fitted to the grinding wheel, clogging of the super-abrasive grinding wheel tip 4 can be prevented. It is considered that the general abrasive dropped from the general abrasive chip removes the clogged metal from the surface of the superabrasive grinding wheel chip 4 to eliminate the clogging.

FIG. 8 is a plan view showing another embodiment of a grinding wheel capable of exchanging chips according to the present invention, and FIG. 9 is a sectional view taken along line EE of FIG. An annular grinding ring 15 is screwed onto the periphery of the base wheel 1. At several places on the upper surface 16 of the metal grinding ring 15,
A grinding tip 17 formed by bonding super-abrasive grains such as diamond abrasive grains and CBN abrasive grains is fixed.

FIG. 10 is a plan view showing an embodiment of the present invention in which the whole chip-replaceable grinding wheel is a flexible grinding wheel.
1 is a sectional view taken along line FF of FIG. The base vehicle 1 is entirely made of an elastic material such as a hard polyurethane resin, and has a surface 2
Is divided into at least two or more radially inner chips 4a and radially outer chips 4b of the base wheel 1 with a slight gap d therebetween. To place. The radial inner tip 4a and the radial outer tip 4b are fastened to the base vehicle 1 by bolts 12 and nuts 14, respectively, as shown in FIG.

Reference numeral 21 denotes a surface 2 of the base vehicle 1 made of an elastic material.
For the purpose of preventing the bare part without the grinding wheel tip 4 of the above from directly sliding at high speed on the workpiece during the grinding operation and being rapidly worn, the surface 2 of the elastic base vehicle 1 is Tack 22
It is a reinforcing plate made of thin stainless steel or the like, which is fixed by the above method.
A seat plate made of a thin synthetic resin plate or the like for stabilizing the fastening of the grinding wheel tip 4 by the bolts 12 and the nuts 14 and the caulking of the studs 22 is provided on the lower surface of the base vehicle 1. It is desirable that glass fiber reinforcing cloth 23 is inserted into the outer disk portion of the elastic base vehicle 1 for reinforcement.

According to the above-mentioned flexible grinding wheel, since the grinding wheel tip 4 is divided into two parts outside and inside in the radial direction, the grinding wheel tip 4 can be slightly curved at the divided part. The tip 4 comes into close contact with and slides along the surface of the workpiece, and can be conveniently ground even when grinding a curved surface.

[0023]

According to the grinding wheel of the present invention, when the grinding wheel tip 4 mounted on the base wheel 1 is worn, only the grinding wheel tip 4 can be easily attached and detached and replaced. Grinding costs can be greatly reduced as compared with the case where a grinding wheel using grains or CBN grains is used.

When the grinding wheel tip 4 using superabrasive grains is used, the cutting speed is greatly improved as compared with a normal grinding wheel using general abrasive grains. At this time, a part of the grinding wheel tip 4 using super-abrasive grains is replaced with the grinding wheel tip 4 using general abrasive grains, and when both are used in combination, the grinding wheel of the super-abrasive grains is used even when cutting a soft metal. No clogging occurs.

When the base wheel 1 of the grinding wheel of the present invention is made of a light metal alloy, a lightweight super-abrasive grinding wheel is obtained, the fatigue due to the grinding operation is reduced, and the working environment is improved. .

Depending on the type and material of the workpiece, an appropriate grinding wheel tip 4 can be selected and used by fitting it to the base wheel 1, and several types of grinding wheel tips 4 are prepared. It is sufficient, and there is no need to separately prepare various expensive superabrasive grinding wheels.

Using the flexible base wheel 1, the grinding wheel tip 4
By splitting the inside and outside, an elastic grinding wheel can be obtained, which is convenient for grinding a curved surface.

[Brief description of the drawings]

FIG. 1 is a plan view of an example of a grinding wheel capable of exchanging chips according to the present invention.

FIG. 2 is a diagram showing an example of an A-type grinding wheel having interchangeable tips according to the present invention.
It is A sectional drawing.

FIG. 3 is a cross-sectional view along an arc BB of an example of a grinding wheel with interchangeable tips according to the present invention.

FIG. 4 is a plan view of another example of a grindstone wheel with a replaceable chip according to the present invention.

FIG. 5 is a cross-sectional view of another example of the grinding wheel of the present invention, taken along line CC.

FIG. 6 is a plan view of another example of the grinding wheel with interchangeable tips of the present invention.

FIG. 7 is a sectional view taken along line DD of another example of the grinding wheel with interchangeable tips according to the present invention.

FIG. 8 is a plan view of still another example of the grinding wheel with interchangeable tips according to the present invention.

FIG. 9 is a cross-sectional view taken along the line E-E of still another example of the tip-replaceable grinding wheel of the present invention.

FIG. 10 is a plan view of an example of a chip-exchangeable grinding wheel of the present invention having flexibility.

FIG. 11 is a cross-sectional view taken along line FF of an example of a chip-exchangeable grinding wheel of the present invention having flexibility.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Base wheel 2 Surface 3 Chip fitting groove 4 Grinding wheel tip 5 Offset grinding wheel 6 Center member 7 Disk member 8 Offset part 9 Inner peripheral part 10 Holding ring 11 Chip fitting recess 12 Bolt 13 Through-hole 14 Nut 15 Grinding Ring 16 Upper surface 17 Grinding tip 18 Substrate 19 Female screw 20 Superabrasive grain 21 Reinforcement plate 22 Tack 23 Glass fiber reinforcement cloth 24 Seat plate

Claims (9)

[Claims] In an offset grinding wheel, a plurality of shallow chip fitting grooves or chip fitting recesses are provided on the surface of a base wheel having a shape substantially similar to that of a normal offset grinding wheel, and at least the surface is formed of an abrasive layer. A tip-replaceable grinding wheel, wherein a grinding wheel tip is removably and exactly fitted into the tip fitting groove or the recess. 2. The grinding wheel according to claim 1, wherein said chip fitting groove is a chip fitting groove radially formed on a surface of said base wheel. 3. The chip-replaceable grinding wheel according to claim 2, wherein said chip-fitting groove is a chip-fitting groove whose cross-sectional shape in the width direction has a bottom surface wider than a width of an upper end of said chip-fitting groove. . 4. The grinding wheel according to claim 3, wherein said chip fitting groove is a chip fitting groove having a width narrower outside a radially inner side of said base wheel. 5. A bolt is erected on the lower surface of the grinding wheel tip which fits into the chip fitting groove or the chip fitting recess, and the bolt is placed on the bottom surface of the chip fitting groove or the chip fitting recess. A tip-replaceable grinding wheel that is inserted into the through hole provided and fastened from the lower surface of the base wheel. 6. The grinding wheel tip comprises diamond abrasive grains, C
5. A grinding wheel tip formed by bonding superabrasive grains such as BN abrasive grains to the surface.
A replaceable grinding wheel as described. 7. A grinding wheel chip made of general abrasive grains such as alumina abrasive grains or silicon carbide abrasive grains is fitted into a part of the plurality of chip fitting grooves or chip fitting recesses, and the other of the chips is formed. 5. A grinding wheel chip formed by coupling superabrasive grains such as diamond abrasive grains and CBN abrasive grains into the fitting grooves or the recesses for chip fitting. A replaceable grinding wheel as described. 8. An offset grinding wheel, comprising: a grinding wheel having super abrasive grains such as diamond abrasive grains and CBN abrasive grains fixed at a plurality of positions on an upper surface of a base wheel having a shape substantially similar to that of a normal offset grinding wheel. A tip-replaceable grinding wheel that is detachably mounted. 9. A base wheel made of an elastic material such as hard urethane resin is used as the base wheel, and the grinding wheel tip is divided and fitted into two or more radially outside and inside portions of the base wheel.
2. The grinding wheel according to claim 1, wherein said grinding wheel has flexibility.