JPH0815708B2 - Cup-shaped grindstone - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cup-shaped grindstone provided with a cylindrical grindstone body, and more particularly to a technique for simply and efficiently introducing a grinding fluid into the inner peripheral space thereof.

[0002]

2. Description of the Related Art A cup-shaped grindstone, a ring-shaped grindstone, a flat-shaped grindstone, and the like are provided with an annular outer peripheral wall, and the end surface of the outer peripheral wall, that is, the grinding surface is brought into sliding contact with the work surface, thereby grinding the work surface There is known a cup-shaped grindstone of the type. When performing wet surface grinding using such a cup-shaped grindstone, usually, a grinding liquid supply pipe for discharging the grinding liquid toward the vicinity of the grinding portion between the grindstone and the work material is provided. , The grinding liquid is supplied from the pipe to the grinding surface, but since the work surface of the work material and the grinding surface of the cup-shaped grindstone are brought into surface contact, when such grindstone is used, The grinding fluid supplied from is not sufficiently supplied to the grinding surface. For this reason, when trying to maintain the grinding efficiency, grinding burn, grinding cracks, etc. occur, and the effect of the grinding liquid is insufficient, and the grinding quality of the work material cannot be sufficiently obtained.

On the other hand, a plurality of grinding fluid introduction holes are formed through the outer peripheral wall of the cup-shaped grindstone body, and the grinding fluid is discharged from the nozzle toward the grinding fluid introduction holes to form a cup-shaped grinding stone. It has been proposed to supply the grinding fluid directly into the body of the grindstone. For example, Japanese Patent Laid-Open No. 4-576
That is what is described in Japanese Patent Publication No. 77. According to such a cup-shaped grindstone, the grinding fluid introduced into the inside of the cup-shaped grindstone main body can be sufficiently supplied to the sliding contact surface between the grindstone and the work material by the centrifugal force accompanying the rotation of the grindstone. In addition, compared to the case of using a device that supplies grinding liquid into the rotary shaft that supports the cup-shaped grindstone body, a complicated connection device for connecting the grinding liquid supply pipe and the rotary shaft supply hole is not required. Therefore, there is an advantage that the grinding machine is simply configured and is inexpensive.

[0004]

However, a cup-shaped grindstone
End of step processing, pocket processing, groove inner surface processing, etc.
Grinding, for example, in milling
Outside of 20 to 30 mmφ, which is used for the center
Some have a relatively small diameter with a diameter. Such a small diameter
For a cup-shaped grindstone, grind the outer peripheral wall of the grindstone body as described above.
When the liquid introduction hole is formed, the grindstone body is attached to the rotary shaft.
For the radial direction between the head of the bolt member and the inner surface of the grindstone.
A gap is required, and the cup-shaped grindstone has a sufficiently small diameter.
I couldn't.

The present invention has been made in view of the above circumstances, and an object thereof is to generate grinding burn even when the diameter is small and the end surface and the outer peripheral surface can also be used as grinding surfaces. It is to provide a cup-shaped grindstone that can be ground without grinding.

[0006]

The object of the present invention to achieve such an object is to provide a cylindrical grindstone main body and a rotary shaft having the grindstone main body fitted to a tip end thereof, during grinding is a cup-shaped grindstone in the form of grinding liquid is supplied from the inner peripheral side of the grinding stone, the times
The rolling axis is (a) the rake angle to the circumferential direction is toward the outer peripheral side.
A plurality of spiral blades that are smaller and have the same axial height
A frusto-conical tip surface with equal angular intervals in the circumferential direction
And the outer diameter of the rotating shaft body formed in (b)
The outer peripheral surface of the same diameter as the
And is brought into contact with the tip of the spiral blade of the rotating shaft body.
This opens the outer peripheral surface of the rotary shaft and moves toward the inner peripheral side in the direction opposite to the rotating direction of the rotary shaft.
As it goes toward the inner circumference side, it goes to the tip side of the rotary shaft.
A spiral passage Cow, the inner peripheral end of the spiral path the
Forming an axial passage that communicates with the inner circumference of the whetstone body
A ring-shaped member that has a diameter smaller than the inner diameter of the ring-shaped member.
Tilt shaft and the axial passage to the inner peripheral side of the grindstone body.
A disk that has a through hole for communication and connects to the bolt shaft
And a bolt shaft part of the rotary shaft main body.
The disk-shaped head is screwed into the center of the end face.
From the bolt member for fixing the annular member to the rotary shaft main body
It has been configured.

[0007]

According to this structure, when the cup-shaped grindstone is driven to rotate and the grinding liquid is sprayed from the predetermined nozzle toward the outer peripheral surface of the rotating shaft during the grinding process, the grinding liquid is supplied to the outer peripheral surface of the rotating shaft. Is received in a spiral passage opening in the surface and guided by an axial passage, and further an annular portion
Provided on the head of the bolt member that secures the material to the rotating shaft body
It is supplied to the inner peripheral side of the grindstone body through the through hole .

[0008]

As a result, the spiral shape formed on the annular member
The grinding fluid that has passed through the passage and the axial passage passes through the annular member.
Grinding with a through hole provided in the head of the fixing bolt member
Since it is supplied to the inner peripheral side of the stone body, the annular member and the head
Can have the same diameter, and an extremely small diameter cup
The whetstone can be configured.

Further, a through hole provided on the head of the bolt member
The hole fixes the annular member to the rotating shaft body with a bolt member.
It can be used as an engaging hole for a rotary tool when
There is no need for a radial gap between the stone inner surface and the head,
Due to this, the diameter of the cup-shaped grindstone becomes extremely small.

Further, in grinding, a cup-shaped grindstone
Is driven to rotate and is ground toward the outer peripheral surface of the rotating shaft.
When the cutting fluid is sprayed from the specified nozzle, the grinding fluid is
Is opened on the outer peripheral surface of the
As it goes toward the inner circumference side as it goes along,
Received in the spiral passage toward the tip of the rotating shaft
At the same time, it is guided to the tip surface of the rotating shaft by an axial passage.
The grinding fluid is sufficiently supplied to the inner peripheral side of the wheel body.
Therefore, grinding can be performed without causing grinding burn.
It

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below in detail with reference to the drawings.

FIG. 1 shows a cross section of an essential part of an end mill type cup-shaped grindstone 10 used for step processing, pocket processing, groove processing and the like. The cup-shaped grindstone 10 is a relatively small-diameter grinding tool having an outer diameter of, for example, 20 to 30 mmφ, and is provided, for example, in a grinding center which is a grinding machine capable of automatically replacing various kinds of grinding tools. A base end portion (not shown) of the rotary shaft 12 (upper part in FIG. 1) is connected to a drive shaft to be rotationally driven. The arrow in FIG. 2 indicates the rotation direction of the cup-shaped grindstone 10.

In FIG. 1, a cup-shaped grindstone 10 is composed of a metallic rotary shaft 12 and a cylindrical grindstone main body 14 fitted to the tip of the rotary shaft 12. The grindstone body 14 is made of super abrasive grains such as CBN or diamond bonded by a binder such as a synthetic resin, an inorganic material, or a metal, and is projected from the tip surface of the rotary shaft 12 by a predetermined dimension P. For example, it is fixed to the outer peripheral surface of the rotary shaft 12 with an adhesive.

The rotary shaft 12 has a shaft body 16, an annular member 18 having the same outer diameter as that of the shaft body 16 and fitted at its tip, and the annular member 18 is fastened to the shaft body 16. For this reason, it is formed into a columnar shape by being configured with a bolt member 20 screwed into a female screw hole 19 formed in the shaft body 16. As shown in FIGS. 2 and 3, a frusto-conical surface composed of a small-diameter tip surface 22 and a taper surface 24 on the outer peripheral side thereof is formed at the tip portion of the shaft body 16, and the taper surface 24 is formed on the tapered surface 24. The four spiral blades 26 are integrally formed so as to be continuous along the spiral that extends in the rotation direction of the rotary shaft 12 from the inner peripheral side toward the outer peripheral side. The spiral blade 26 is provided between the concentric circle A having a diameter larger than that of the small-diameter tip surface 22 and the outer peripheral surface of the shaft body 16, and the inclination angle with respect to the circumferential direction, that is, the rake angle, becomes smaller toward the outer peripheral side. Is formed.

The spiral blades 26 are formed so that their heights in the axial direction are substantially the same as each other.
The inner peripheral side portion between the concentric circle B having a larger diameter than that and the concentric circle B is formed higher than the outer peripheral side portion of the concentric circle B, and the stepped surface 28 between the inner peripheral side portion and the outer peripheral side portion is formed. The centering between the shaft body 16 and the annular member 18 is thereby performed.

As shown in FIG. 4, the annular member 18 has an outer peripheral surface having the same diameter as the shaft body 16 and an inner peripheral surface having the same diameter as the concentric circle A and fitted with the stepped surface 28. A first annular member having a shape parallel to the tapered surface 24 and substantially in contact with a portion of the spiral blade 26 on the outer peripheral side of the concentric circle B.
The taper surface 30 and the second taper surface 32 having a taper angle smaller than that of the first taper surface 30 and formed on the side opposite to the first taper surface 30 are provided.

As shown in FIG. 5, the bolt member 20 includes a bolt shaft portion 34 formed with a male screw, and a taper shaft portion 36 continuous with the bolt shaft portion 34 and parallel to the second tapered surface 32. The shaft body 1 is connected to the taper shaft portion 36 and
6 and a disk-shaped head portion 38 having the same diameter. Head 38
Has eight through holes 4 located at equal intervals in the circumferential direction.
0 and a stepped surface 42 that is fitted with the second tapered surface 32 of the annular member 18 are formed.

The rotating shaft 12 is the shaft body 16 and the annular member 1.
8. Since it is assembled from the bolt member 20, the spiral passage 48 formed by the spiral blade 26, the tapered surface 24, and the first tapered surface 30 in the rotating shaft 12, and the inner circumference of the annular member 18. Surface and second tapered surface 32, through hole 4
And an axial passage 50 formed by 0. The spiral passage 48 has a spiral shape that opens toward the outer peripheral surface of the shaft body 16 and heads toward the inner peripheral side in a direction opposite to the rotation direction of the shaft main body 16, and the rake angle increases toward the outer peripheral side. Is formed so as to be smaller and closer to the inner circumferential side, and is closer to the tip end surface of the rotating shaft 12. Also,
The axial passage 50 connects the inner peripheral end of the spiral passage 48 and the tip end surface of the rotary shaft 12.

The cup-shaped grindstone 10 configured as described above
The surface of the rotary shaft 12 is ground by being brought into contact with a work material (not shown) while the base end portion of the rotary shaft 12 is connected and rotated by a chuck device (not shown). In this state, the grinding fluid discharge pipe 52 is arranged near the cup-shaped grindstone 10 so that the grinding fluid discharged from the grinding fluid discharge tube 52 is discharged in a direction substantially matching the center line of the opening of the spiral passage 48. The grinding fluid discharged from the grinding fluid discharge pipe 52 is positively introduced from the four openings of the spiral passage 48.

In this embodiment, since the rake angle of the opening of the spiral passage 48 is extremely small, the spiral passage 48 is formed.
The grinding fluid introduced into the opening of the spiral passage 48 is easily received in the spiral passage 48 and guided to the inner circumference thereof in accordance with the acting force toward the inner peripheral side generated due to the spiral shape of the spiral passage 48. Then, it is guided to the tip surface of the rotary shaft 12 by the axial passage 50 and supplied to the inner peripheral side of the cylindrical grindstone body 14.

Therefore, the spiral formed on the annular member 18
The grinding fluid passing through the passages 48 and the axial passages 50 is
It is provided on the head 38 of the bolt member 20 for fixing the annular member 18.
Supply to the inner peripheral side of the whetstone body 14 through the cut-out through hole 40
Therefore, the annular member 18 and the head portion 38 have the same diameter.
The cup-shaped grindstone 10 can be made extremely small in diameter.
Can be configured. Therefore, even if the grinding fluid introduction hole cannot be provided through the outer peripheral wall of the grindstone body 14, the grinding fluid can be sufficiently supplied to the grinding portion, and the grinding burn, the grinding crack, the roughened surface to be ground, Abnormal wear is preferably prevented, and highly efficient and high-performance grinding is possible with a simple structure.

A through hole 40 provided in the head 38
Attaches the annular member 18 to the shaft body 16 with the bolt member 20.
It is used as an engaging hole for rotating tools when fixing
In the radial direction between the inner peripheral surface of the grindstone body 14 and the head portion 38.
There is no need for a gap, which also makes the cup-shaped grindstone 10
It has a very small diameter.

Further, in grinding, a cup-shaped grindstone
10 is driven to rotate and faces the outer peripheral surface of the rotary shaft 12.
Once the grinding fluid was sprayed from the grinding fluid discharge pipe 52,
The cutting fluid is opened on the outer peripheral surface of the rotary shaft 12 and rotates the rotary shaft 12.
As it goes in the direction opposite to the rolling direction, it goes to the inner circumference side and
A vortex that heads toward the tip of the rotating shaft 12 toward the inner circumference side
It is received in the winding passage 48 and further axially
Since it is guided to the tip surface of the rotary shaft 12 by the passage 50,
The cutting fluid can be sufficiently supplied to the inner peripheral side of the whetstone body 14,
Grinding is possible without causing scoring.

Although one embodiment of the present invention has been described above with reference to the drawings, the present invention can be applied to other modes.

For example, although the grindstone body 14 of the above-described embodiment has a cylindrical shape, it is provided with an annular outer peripheral wall such as a ring shape or a flat shape, and the end surface of the outer peripheral wall is brought into sliding contact with the work plane. Any type of grindstone that grinds the work surface may be used.

Further, although the grindstone body 14 of the above-mentioned embodiment is composed of the superabrasive grindstone, the grindstone may be composed of silicon carbide abrasive grains or fused alumina abrasive grains.

Further, in the above-mentioned embodiment, the four spiral blades 2 are used.
Although 4 spiral passages 48 were formed by 6,
Alternatively, three or five or more spiral passages 48 may be formed.

The above description is merely an embodiment of the present invention, and the present invention can be variously modified without departing from the gist thereof.

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing a main part of a cup-shaped grindstone according to an embodiment of the present invention.

FIG. 2 is a view showing a front end surface of a rotary shaft main body of the embodiment of FIG.

FIG. 3 is a perspective view showing a tip end surface of a rotary shaft main body of the embodiment of FIG.

FIG. 4 is a perspective view showing an annular member of the embodiment of FIG.

5 is a perspective view showing a bolt member of the embodiment of FIG. 1. FIG.

[Explanation of symbols]

10: cup-shaped grindstone 12: rotary shaft 14: grindstone main body 16: shaft main body (rotary shaft main body) 18: annular member 20: bolt member 26: spiral blade 34: bolt shaft portion 38: head 48: spiral passage 50: Axial passage

Claims (1)

[Claims] 1. A cup having a cylindrical grindstone main body and a rotary shaft having the tip of the grindstone main body fitted to the tip thereof, and a grinding liquid is supplied from an inner peripheral side of the grindstone main body during grinding. -Shaped grindstone, the rake angle of the rotary shaft with respect to the circumferential direction becomes smaller toward the outer peripheral side.
In addition, multiple spiral blades with the same axial height are equiangular in the circumferential direction.
Formed on the tip surface of the frusto-conical surface so that there are intervals
The rotating shaft main body and the outer peripheral surface having a diameter equal to the outer diameter of the rotating shaft main body are the grindstone main body
Is fixed to the inner peripheral surface of the
By being brought into contact, the rotation shaft peripheral surface to open and and have suited to the inner peripheral side with the heading in the direction opposite to the rotational direction of the rotary shaft as toward the inner peripheral side of the rotary shaft Destination
A spiral path toward the end portion side, and the axial passage for communicating the inner peripheral side of the grinding stone and the inner peripheral end of the spiral passageway
Forming an annular member, a bolt shaft portion having a diameter smaller than the inner diameter of the annular member, and the axial direction
Provided with a through hole that connects the passageway to the inner circumference of the whetstone body.
And a disk-shaped head portion connected to the bolt shaft portion.
The tilt shaft is screwed into the center of the end face of the rotary shaft body.
The disk-shaped head causes the annular member to move to the rotary shaft main body.
A cup-shaped grindstone comprising a bolt member fixed to the .