JP2001009683A - Edge surface grinding tool - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an edge surface grinding tool capable of providing an edge tool having large edge thickness and excellent durability. SOLUTION: An edge surface grinding tool is provided with a grinding wheel 2 of a toroidal shape, is driven to rotate about an axis thereof, and makes an inner peripheral edge 2a as a grinding portion 2b. For example, when a cutting edge 7 of an edge tool 5 is ground by the edge surface grinding tool of this structure, on the cutting edge 7 part obtained by the grinding process, edge surfaces 7a, 7 are made to be a convex arc surface having a curvature corresponding to the curvature of the inner peripheral edge 2a of the grinding wheel 2, and has a thick shape in a middle part in a cross section to have excellent durability and high stiffness in a thickness direction of the cutting edge 7.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a blade surface grinding tool provided with a grindstone driven to rotate.

[0002]

2. Description of the Related Art For example, when a blade surface is formed at the edge of a plate-shaped blade, it is common to employ a grinding process using a grindstone. FIG. 1 shows a conventional blade surface grinding tool 31.

[0003] This blade surface grinding tool 31 has a disk shape and is formed annularly on the outer peripheral edge of a grindstone base 33 which is rotationally driven by an appropriate rotational driving means.
A grinding wheel 32 having a grinding portion 2a is attached. Then, at the time of grinding the blade 35, FIG.
As shown in FIG. 9, the cutting edge forming portion 3 of the cutting tool 35 with respect to a reference point P set on the outer peripheral edge 32 a of the grindstone 32.
5a (the cutting edge portion at the time of re-grinding) is
The tangent L ₀ of the grinding wheel outer peripheral edge 32a at the center line L ₁ and the reference point P of the tool 35 through the 5a is set to an angle set to have a predetermined angle alpha. Thereafter, the blade surface grinding tool 31 is rotated, and in this state, the blade 35 is
The cutting edge is moved in the directions of arrows ab while moving in the directions of arrows cd to adjust the cutting amount, thereby forming the cutting edges over the entire area of the cutting edge forming portion 35a. By performing such grinding on both surfaces of the cutting tool 35, a cutting blade 36 having cutting surfaces 36a and 36b on both surfaces thereof can be obtained as shown in an enlarged view in FIG.

[0004]

By the way, a cutting tool 35 is formed by using a grindstone 32 having such an outer peripheral edge 32a as a grinding portion.
When the cutting edge 36 is formed on the cutting edge 36, as shown in FIG. 10, the both cutting surfaces 36a and 36b of the cutting edge 36 of the cutting tool 35 have a concave circular arc surface having a curvature corresponding to the curvature of the outer peripheral edge 32a of the grinding stone 32. Therefore, the cutting edge 36 has a “medium-thin” cross-sectional shape with a small blade thickness.
The strength in the thickness direction is reduced as compared with the case where 6a and 36b are flat. As a result, when performing required cutting using the cutting tool 35, chipping occurs in the cutting blade 36 due to an impact at the time of machining cutting, making it difficult to continue using the cutting tool 36. There was a problem.

Accordingly, an object of the present invention is to provide a blade surface grinding tool capable of obtaining a blade having a large blade thickness and excellent durability.

[0006]

As a specific means for solving the above-mentioned problems, a blade surface grinding tool of the present invention has an annular shape, is driven to rotate around its axis, and has an inner peripheral edge. It is characterized in that a grinding wheel 2 having a grinding portion 2b in the portion 2a is provided.

[0007]

According to the blade surface grinding tool of the present invention,
Since the grinding wheel 2 has an annular shape, is driven to rotate around its axis, and has a grinding portion 2b at its inner peripheral edge 2a, for example, the cutting edge 7 of the cutting tool 5 is ground by the grinding wheel 2. When processed, the cutting surfaces 7a and 7b of the cutting edge 7 obtained by this grinding are formed into a convex arc surface having a curvature corresponding to the curvature of the inner peripheral edge 2a of the grinding wheel 2, and the blade thickness is increased. It has a thick “medium-thick” cross-sectional shape, and as a result, it is possible to provide a blade with excellent durability.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a blade surface grinding tool according to the present invention will be specifically described based on a preferred embodiment.

FIG. 1 shows a blade surface grinding tool 1 according to the present invention.
Is shown. The blade surface grinding tool 1 includes a grinding wheel 2 and a grinding wheel base 3 described below.

As shown in FIG. 3, the grinding wheel 2 is formed in an annular shape having a predetermined width, and its inner peripheral edge 2a is formed into a wedge shape to form a grinding portion 2b. On the other hand, the grindstone base 3 is formed in an annular shape with a predetermined diameter from a metal material, and an inner peripheral edge 3a is formed in a wedge shape having the same inclination angle as the inner peripheral edge 2a of the grindstone 2. The inner diameter of the grindstone base 3 is set to be substantially the same as the diameter at the base end position 2c of the grinding portion 2b of the grindstone 2.

The grindstone 2 is integrated with the grindstone base 3 by being abutted and fixed to the inner peripheral edge 3a of the grindstone base 3 concentrically therewith.
In this case, from the relative dimensional relationship between the grindstone 2 and the grindstone base 3, as shown in FIG.
The grinding portion 2b extends from the inner peripheral edge 3a of the grinding wheel base 3 to the inner peripheral side thereof, and the grinding portion 2b of the grinding wheel 2
Is substantially the same as the inclined surface on the inner peripheral edge 3a side of the grinding wheel base 3.

The blade surface grinding tool 1 configured as described above has the following features.
As shown in FIG. 1, the tool holder 4 is rotatably driven by a suitable driving means and is concentrically abutted with the front side of the tool holder 4 and fastened by a plurality of fixing bolts 10, 10,. The blade surface grinding tool 1 is rotated integrally with the tool holder 4 to perform required blade surface grinding in the grinding portion 2b provided on the inner peripheral edge 2a of the grinding wheel 2.

Here, the blade surface grinding using the blade surface grinding tool 1 will be described.

As the grinding by the blade surface grinding tool 1, one side 6a of a plate-like material 6 as shown in FIG. 6 is subjected to grinding to provide a cutting blade 7 as shown in FIG. When a new blade 5 is obtained, and when an existing blade 5 as shown in FIG.
In some cases, the cutting ability of the cutting edge 7 is restored by re-grinding the cutting edge 7 portion. In the following, a cutting tool 5 (see FIG. 4) having the double-edged cutting edge 7 is newly formed from the material 6. The case of manufacturing will be described as an example.

At the time of grinding, as shown in FIG.
With respect to the grindstone 2 of the blade surface grinding tool 1 rotating in the direction of the arrow R, the material 6 is formed with a cutting edge forming portion of the material 6 with respect to a reference point P set on the outer peripheral edge 2a of the grindstone 2. is set to an angle set as the center line L ₁ and the tangential line L ₀ of the grinding wheel outer peripheral edge 2a of the reference point P of the material 6 through the cutting edge forming portion has a predetermined angle alpha. Note that this set angle α is
Both cutting surfaces 7a, 7b of the cutting blade 7 to be formed by grinding (see FIG. 4)
Is the inclination angle.

After setting the angle, the blade surface grinding tool 1 is rotated, and in this state, the material 6 is displaced by an arrow c in FIG.
While adjusting the cutting amount by moving in the −d direction, the cutting edge is moved in the direction of the arrow ab to form the cutting edge 7 over the entire cutting edge forming portion of the material 6. By performing such a grinding process on both surfaces of the material 6 respectively, FIG.
As shown in the figure, each cutting surface 7a,
A cutting blade 7 having a cutting edge 7b is formed, and the above-mentioned blade 5 is obtained as a final product. In this case, by moving the material 6 in the direction of the arrow cd to appropriately adjust the cutting amount, not only the straight cutting edge 7 as shown in FIG. A cutting blade 7 having a shape can be obtained.

Incidentally, the blade surface grinding tool 1 of this embodiment
In the above, since the grinding wheel 2 has an annular shape and the inner peripheral edge 2a side is a grinding portion 2b, the grinding portion 2b performs a grinding process on the cutting edge forming portion of the material 6 from both surfaces thereof. In the case where the cutting blade 7 is formed to have the cutting surfaces 7a and 7b on both sides, respectively, as shown in FIG.
A convex arc-shaped surface corresponding to the curvature of the inner peripheral edge 2a of
It will have a "medium thick" cross-sectional shape. As a result, the blade thickness of the cutting blade 7 is larger than when each of the blade surfaces 7a and 7b is a concave arcuate surface, and the strength of the cutting blade 7 in the thickness direction is increased accordingly. The occurrence of such a situation that the cutting blade 7 is broken at the time of cutting in the cutting process using the blade 5 is prevented as much as possible. That is,
According to the blade surface grinding tool 1 of this embodiment, a highly durable blade 5 can be easily provided.

In the above embodiment, the grinding wheel 2 is used.
Although the grinding portion 2b has a single-edge wedge-shaped cross-sectional shape, the present invention is not limited to such a structure. In another embodiment, a double-edge wedge-shaped cross-sectional shape as shown in FIG. You can do it.

[Brief description of the drawings]

FIG. 1 is a perspective view showing a blade surface grinding tool according to an embodiment of the present invention.

FIG. 2 is a view taken in the direction of arrows II in FIG. 1;

FIG. 3 is a view taken in the direction of arrows III-III in FIG. 2;

FIG. 4 is a sectional view taken along line IV-IV of FIG. 3;

FIG. 5 is a perspective view of a blade manufactured by a blade surface grinding tool according to the present invention.

FIG. 6 is a perspective view of a material of a blade shown in FIG. 5;

FIG. 7 is a sectional view showing a shape of a grindstone in another embodiment of the present invention.

FIG. 8 is a perspective view showing a conventional blade surface grinding tool.

FIG. 9 is a view taken along the arrow IX in FIG. 8;

FIG. 10 is a cross-sectional view of a blade manufactured by a conventional blade surface grinding tool.

[Explanation of symbols]

1 is a blade surface grinding tool, 2 is a grindstone, 2a is the inner peripheral edge of the grindstone, 2
b is a grinding wheel grinding part, 3 is a grinding wheel base, 4 is a tool holder,
5 is a blade, 6 is a material, 7 is a cutting blade, and 10 is a fixing bolt.

Claims (1)

[Claims] 1. A blade having an annular shape and provided with a grindstone (2) driven to rotate around its axis and having an inner peripheral edge (2a) portion as a grinding portion (2b). Surface grinding tool.