JP2002224953A - Grinder wheel mounting device - Google Patents

Abstract

(57) [Summary] [PROBLEMS] To prolong the life of a grinding wheel by eliminating runout at the peripheral edge of the grinding wheel. SOLUTION: The grindstone mounting device of a grinder for attaching an annular grindstone 3 to an end of a rotating shaft 2 of a grinder 1 via an annular holder 4A, wherein a center of a tip surface of the rotating shaft 2 faces forward. The grindstone 3 is fixed to the flange 4a of the holder 4A, and the inner surface of the hole 4b at the center of the holder 4A on the flange 4a side has the conical protrusion 2a. The holder 4A has a tapered portion 4c to be fitted therein. The holder 4A is fitted to the tip of the rotating shaft 2, and the tip surface 2c of the rotating shaft 2 and the flange 4a of the holder 4A.
And the inner end face 4f of the base member was abutted and fixed.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a grinder wheel mounting apparatus for grinding a turbine blade or the like, and more particularly to a grinder wheel mounting apparatus using an electrodeposited CBN wheel for a grinding wheel.

[0002]

2. Description of the Related Art An electrodeposited CBN wheel is formed by plating a metal such as Ni on the outer peripheral surface of a base metal using a CBN (Cubic Boron Nitride).
A wheel with fixed abrasive grains. Since the abrasive holding power is excellent compared to other bonds, the amount of abrasive projection is large and the sharpness is good, and since it is also excellent in safety, in recent years,
Attached to a grinder, it is often used for high-precision forming grinding of turbine blades and the like.

FIG. 2 is a side view of a grinder. In the figure, 1 is a grinder. 2 is a rotation axis of the grinder 1. 3 is an electrodeposition C attached to the tip of the rotating shaft 2
It is a BN wheel (hereinafter, referred to as a "grindstone"). Reference numeral 4 denotes a holder for fixing the grindstone 3. FIG. 3 is a cross-sectional view of a conventional grinder mounting apparatus for a grinder. In the figure, 1 is a grinder. 2 is a rotation axis of the grinder 1. 2
a is a conical projection provided at the center of the tip end surface 2c of the rotating shaft 2 and having a diameter decreasing outward. 2b is a tapered portion of the projection 2a. 2d is a screw hole provided at the center of the projection 2a. Reference numeral 3 denotes an annular grindstone attached to the tip of the rotating shaft 2 via a holder 4. The holder 4 includes an annular rear holder 5 and an annular front holder 6. 5
a is a hole at the center of the rear holder 5, and 5b is a flange. 5c is a plurality of screw holes. 5d is the rear holder 5
Are cutouts having an L-shaped cross section from the outer peripheral surface of the flange 5b. Reference numeral 6a denotes a flange of the front holder 6; Reference numeral 6c denotes a tapered portion whose diameter increases toward the rear of the screw hole 6b, and reference numeral 6d denotes an inner end surface of the front holder 6. 6e is a flange 6 of the front holder 6
a is a notch having an inverted L-shaped cross section from the outer peripheral surface of FIG. 6f
Is a plurality of stupid holes. The whetstone 3 is fastened by a plurality of fixing bolts 8 screwed into the screw holes 5c of the rear holder 5 so as to be sandwiched from the left and right on the paper surface by the notch 5d of the inner holder 5 and the notch 6e of the front holder 6. I have.
Reference numeral 7 denotes a fixing bolt for fixing the holder 4 to the rotary shaft 2, which penetrates a hole 6b at the center of the front holder 6, and is screwed into a screw hole 2d of the rotary shaft 2 via a washer 7a. Reference numeral 9 denotes a gap between the front end surface 2c of the rotating shaft 2 and the inner end surface 6d of the front holder 6.

[0004]

In the conventional grinder mounting apparatus for a grinder, the grindstone is fixed so as to be sandwiched between a holder constituted by a rear holder and a front holder, and the holder is formed into a conical projection at the tip of a rotating shaft. , And is only fastened to the protrusion of the rotating shaft with a fixing bolt, so that a gap is generated between the front end surface of the rotating shaft and the inner end surface of the holder. Therefore, the precision of the mounting portion between the rotating shaft and the holder is poor, and the tip of the grinding wheel is deflected, so that sufficient precision and strength cannot be provided, and the life of the grinding wheel is shortened.

The present invention has been devised to solve the above-mentioned problems, and has a sufficient precision and strength in a mounting portion of a rotating shaft and a holder to prevent a run-out of a whetstone tip. It is an object of the present invention to provide a grinder mounting apparatus for a grinder, which can improve the life of the grinding wheel.

[0006]

In order to achieve the above object, a grindstone mounting device for a grinder according to the present invention is provided. In the apparatus, a center of the tip end surface of the rotating shaft has a conical protrusion that decreases in diameter toward the front, the grindstone is fixed to the flange of the holder, and the hole at the center of the holder is located on the flange side. The inner surface has a tapered portion that fits with the conical protrusion, and a holder is fitted to the tip of the rotating shaft, and the tip surface of the rotating shaft and the inner end surface of the flange of the holder are abutted and fixed. It was done.

[0007] It is preferable that the grindstone, the flange of the holder and the tip surface of the rotating shaft and the flange of the holder are respectively fixed by a plurality of fixing bolts.

Further, the rotary shaft has a convex portion on the tip end surface, and the holder has an inner end surface with a plurality of concave portions. When the holder is fitted to the rotary shaft and tightened, the concave portion is fitted into the convex portion. It is preferable to perform positioning.

[0009] Further, it is preferable that the projection on the tip end surface of the rotating shaft is a bolt.

Next, the operation of the present invention will be described. An annular grindstone is fixed to the flange of the annular holder with a plurality of fixing bolts, the holder is fitted to the conical projection at the tip of the rotating shaft, aligned, and then gradually tightened with the plurality of fixing bolts. . When the fixing bolt is tightened, it advances inward of the holder, and the conical projection at the center of the rotating shaft and the tapered portion of the center hole of the holder are firmly fitted. Touch As described above, since the joint is made on the two surfaces in the radial direction and the axial direction, the rotating shaft and the holder are fixed accurately and firmly, and no run-out occurs. Also, when the holder is fitted to the rotating shaft, the holder is positioned by fitting the recess on the inner end surface of the holder to the positioning bolt on the tip surface of the rotating shaft. If used, the initial run-out will have a good shape due to the wear of the particles, and the run-out when re-attaching will be extremely good.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a cross-sectional view of a grinder mounting apparatus for a grinder according to the present invention. The same members as those described in FIGS. 2 and 3 are denoted by the same reference numerals and described. In the figure, 1 is a grinder. Reference numeral 2 denotes a rotating shaft of the grinder 1, which has a conical projection 2a whose diameter decreases outward at the center of the tip end surface 2c. 2b is a tapered portion of the projection 2a. 2d is a plurality of screw holes. Reference numeral 3 denotes an annular grinding wheel (electroplated CBN wheel) having a hole 3a at the center attached to the tip of the rotating shaft 2.
It is. Reference numeral 3b denotes a plurality of fool holes provided in the grindstone 3. 4
A is an annular holder for fixing the grindstone 3. 4a is a flange of the holder 4A. Reference numeral 4b denotes a hole provided at the center of the holder 4A, and reference numeral 4c denotes a tapered portion provided in the hole 4b and whose diameter increases rearward. Reference numeral 4d denotes a plurality of recesses provided on the inner end face 4f of the holder 4A. Reference numeral 4e denotes a plurality of screw holes provided in the flange 4a of the holder 4A, and 4g denotes a plurality of fool holes provided in the holder 4A. Reference numeral 11 denotes a plurality of fixing bolts, which pass through the holes 3b of the grindstone 3 and are screwed into the screw holes 4e of the flange 4a of the holder 4A to fasten the grindstone 3 and the holder 4A. Reference numeral 12 denotes a plurality of fixing bolts, which are screwed into the screw holes 2d of the tip end surface 2c of the rotating shaft 2 through the fugitive holes 4g of the holder 4A to fasten the rotating shaft 2 and the holder 4A. Reference numeral 13 denotes a removal portion used to remove the holder 4A provided on the inner peripheral surface at the tip of the hole 4b of the holder 4A.

Numeral 10 denotes a projection formed by a plurality of positioning bolts provided on the tip end surface 2c of the rotary shaft 2. When the holder 4A is fitted to the projection 2a of the rotary shaft 2 and tightened, the holder 4A is used.
The holder 4A is positioned by fitting a plurality of recesses 4d provided in the inner end surface 4f of the holder 4A.

Next, the operation of the embodiment will be described.
The ring-shaped grindstone 3 is fixed to the flange 4a of the ring-shaped holder 4A with a plurality of fixing bolts 11, and the holder 4A is fitted on the conical projection 2a at the tip of the rotating shaft 2, and after the positioning, the plurality of Gradually with the fixing bolts 12 of FIG. With the tightening of the fixing bolt 12, the holder advances to the inside of the holder 4A,
The conical projection 2a at the center of the rotating shaft 2 and the tapered portion 4c of the center hole of the holder 4A are firmly fitted, and the distal end surface 2c of the rotating shaft 2 and the inner end surface 4f of the holder 4A abut. As described above, since the joint is made on the two surfaces in the radial direction and the axial direction, the rotating shaft 2 and the holder 4A are accurately and firmly fixed, and no run-out occurs. Further, when the holder 4A is fitted to the rotating shaft 2, the holder 4A is positioned by fitting the recess 4d of the inner end surface 4f of the holder 4A into the positioning bolt 10 of the front end surface 2c of the rotating shaft 2.
In addition to facilitating the screwing of No. 2, once used, once mounted, the initial run-out becomes a good shape due to the abrasion of the particles, and the run-out when re-attaching becomes extremely good.

The present invention is not limited to the embodiments described above, and various modifications can be made without departing from the gist of the present invention.

[0015]

As described above, according to the grinder mounting apparatus for a grinder of the present invention, the rotating shaft and the mounting portion of the holder are provided with sufficient accuracy and strength to prevent the deflection of the whetstone tip. As a result, the life of the grindstone can be extended.In addition, when the holder is mounted on the rotating shaft, positioning is performed with the positioning bolts, which makes it easier to screw in the fixing bolts. The run-out becomes a good shape due to the wear of the particles, and the run-out when re-attaching becomes extremely good.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view of a grinder mounting apparatus for a grinder according to the present invention.

FIG. 2 is a side view of a grinder.

FIG. 3 is a cross-sectional view of a conventional grinder mounting apparatus for a grinder.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Grinder 2 Rotating shaft 2a Projection 2b Taper part 2c Tip surface 3 Electrodeposited CBN wheel (grinding stone) 4, 4A Holder 4a Flange 4b Center hole 4c Taper part 4d Depression 4e Screw hole 4g Flush hole 4f Inner end face 5 Rear holder 6 Front side Holder 7, 8, 11, 12 Fixing bolt 9 Gap 10 Convex part (positioning bolt)

Claims (4)

[Claims] 1. A grindstone attaching device for a grinder for attaching an annular grindstone to an end of a rotating shaft of a grinder via an annular holder, wherein the diameter of the rotating shaft is reduced toward the center at the front end surface. It has a conical protrusion, the grindstone is fixed to the flange of the holder, and the inner surface of the hole at the center of the holder on the flange side has a tapered portion that fits with the conical protrusion, A grindstone mounting device for a grinder, wherein a holder is fitted to a tip of a shaft, and a tip surface of a rotating shaft and an inner end surface of a flange of the holder are abutted and fixed. 2. The grindstone mounting device for a grinder according to claim 1, wherein the grindstone, the flange of the holder, the tip surface of the rotating shaft, and the flange of the holder are respectively fixed by a plurality of fixing bolts. 3. The rotating shaft has a convex portion on the tip end surface and a plurality of concave portions on the inner end surface of the holder. When the holder is fitted to the rotary shaft and tightened, the concave portion is fitted to the convex portion. 3. The grindstone mounting device for a grinder according to claim 1, wherein the grindstone is mounted by positioning. 4. The grindstone mounting device for a grinder according to claim 3, wherein the projection on the tip end surface of the rotating shaft is a bolt.