JPH0360980A - Cutting tool - Google Patents

Abstract

PURPOSE:To absorb most of elongation occasioned by a tensile force by means of an arcuate notch part and to perform high-efficient cutting work as high precision is maintained by a method wherein a plurality of arcuate notch parts are formed in the side edge of a blade, and rigid abrasive grains are electrodeposited to a side edge except the arcuate notch parts. CONSTITUTION:A plurality of arcuate notch parts 6 are formed in the side edge of a sheet blade 1, and rigid abrasive grains 5 are electrodeposited to the side edge except the arcuate notch parts 6 to produce a desired cutting tool. A number of the sheet blades 1 are arranged in parallel to each other through a spacer. When a work to cut a crystal is effected as a tensile force is exerted, an influence exercised on an eutectoid nickel layer by a tensile force is reduced, and a high-precise cutting work is executed.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a cutting tool suitable for cutting crystal, silicon, special glass, etc. into thin pieces.

(Prior art) Conventionally, in order to cut a large amount of precious stones such as crystal or hard and brittle materials such as silicon with high precision, a large number of blades (1) are arranged parallel to each other as shown in Fig. 3. Then, these are made to reciprocate, and at that time, slurry-like free abrasive grains (2
) is placed on the blade (1) to cut crystal, etc.

However, cutting using such free abrasive grains has a very slow cutting speed, and for example, it takes about 22 to 23 hours to cut a crystal with a height of 451 m and a width of 25 mm.

Furthermore, since loose abrasive grains are placed on the blade for cutting, the width of the blade is worn out by about 21 m in one cutting. Although the number of blades varies depending on the cutting machine used, the number of blades is usually about 250 to 350, and these blades are set parallel to each other with spacers interposed therebetween. Furthermore, since each blade is made of thin plate, it is normally 120 kgf/m.
It is necessary to apply a tension of "~150 kgf/mm" (70 to 80% of the material strength), and it is important to tension the blade evenly, so it takes a long time to replace the blade.
and requires caution. As mentioned above, if the blade wears out quickly, the blade needs to be replaced frequently, which is troublesome.

In order to solve these problems, attempts have recently been made to increase cutting efficiency by electrodepositing hard abrasive grains such as diamond or CBH onto the blade.

As shown in FIG. 4, diamond (5) and nickel are eutectoided on the minus side edge of the blade (1), and diamond is electrodeposited, or CBN is electrodeposited.

(Problem to be solved by the invention) However, the material of the blade is S, which is carbon tool steel.
K material is used, and in order to cut crystal etc. with high precision, the tension must be 70-80% of the strength of the material, that is, 120 kgf/ffi"-150 k for the blade (1).
gf/mi'' is required, and when tension is applied, the elongation strength is different between the blade and the nickel electrodeposited part, so the tension affects the diamond nickel layer and CBN.
Crank occurs in the nickel plating layer and diamond and C
Phenomena of falling off of hard abrasive grains such as BH or peeling of the nickel plating layer occurred, and it could not be put to practical use.

(Means for Solving the Problems) A cutting tool according to the present invention has a circular shape on the side edge in order to solve the above-mentioned problem in the above-mentioned cutting tool which is formed by electrodepositing hard abrasive grains on the side edge of a thin plate blade. Forming multiple arcuate sections,
Hard abrasive grains are electrodeposited on the side edges except for the large arcuate portion, or the large arcuate portion is also provided on the non-electrodeposited side edges to prevent cranking in the nickel coating layer.

(Function) According to the cutting tool according to the present invention, when a large number of thin plate blades are arranged in parallel with spacers interposed therebetween and cutting of crystal, etc. is performed while applying tension, tensile force is applied to the eutectoid nickel layer. High-precision cutting work can be done with less impact.

(Example) Next, an example of the present invention will be described with reference to the drawings.
In the figure, the thin plate blade (1) has a rectangular shape, and through holes (7) are provided on both sides in the longitudinal direction for attachment to a spacer or a hacksaw frame. Further, a plurality of arc-shaped large portions (6) are formed at equal intervals on the longitudinal side edges, and diamond (5) is electrodeposited on the side edges except for the entrance portions to constitute a diamond eutectoid nickel portion. .

The one shown in Fig. 2 has a large arc-shaped part (6a
) is provided corresponding to the arc-shaped large portion (6) in FIG. 1.

In this example, the blade dimensions are 0.25 m thick.

The width is 7n, the length is 408fl, and the grain size is “500”.
diamond was electrodeposited, and tension was applied to this diamond electrodeposited blade using a tensile tester under the following conditions (1) to (2).

■ Testing machine: Amsler universal testing machine ■ Gage length: 300 m ■ Arc of blade: 1.58 m'' Cross-sectional area of the recess The load-elongation curve in this case was as shown in Figure 5. Also, Table 1 shows the relationship between load and elongation up to breakage. Observing the effect on the blade when tension is applied, the elongation at 120 kg (76 kgf/m") is 1.4 n, but diamond The deposited nickel layer was not affected in any way, and no change was observed in the arcuate portion of the non-electrodeposited portion.

Next is the elastic limit of this blade. Tensile load 200k
When applying a tensile force of 126 kgf/11 z, no effect on the diamond eutectoid nickel layer was observed.

Furthermore, at a breaking load of 292 kg and a tension of 184 kgf/m'', no effect was observed on the diamond eutectoid nickel layer. Permanent strain of 2.5u remained in the width.

In addition, although diamond was used as the hard abrasive grain in the above embodiment, it goes without saying that CBN can be used instead.

Furthermore, the tool according to the present invention can be used not only by arranging a plurality of tools in parallel, but also by being attached to a hacksaw frame and used as a hand saw tool.

Table 1 Load-elongation relationship (remarks) The yield point is approximately 250 kg (158 kgf/m").

Yield elongation is 2.7 m (0.9χ).

Tensile force: 120 kg (76 kgf/1 m”) Niokel elongation: 1.4 mm (0,472).

(Effects) As described above, the present invention provides a plurality of circular arc-shaped portions on the side edges of the blade, and hard abrasive grains are electrodeposited on the side edges except for the arc-shaped portions. Even if the plates are arranged parallel to each other and a tensile force is applied to them, most of the elongation caused by the tensile force is absorbed by the large arcuate portion, allowing highly efficient cutting while maintaining high precision. Moreover, 1. the tool has a long service life since there are no negative effects associated with tensile forces.

In this way, problems such as the negative effects on the eutectoid nickel layer of diamond or CBN due to tensile force in the diamond or CBN electrodeposited plate, especially problems such as cracks, diamond falling off, or peeling of the plating parts, are completely solved, making it an extremely practical product. It became a high one.

is a sectional view taken along line A-A in the same figure (A), and the same figure (C) is a cross-sectional view of the same figure (A).
FIG. 2 (a) is a front view of another embodiment,
The same figure (ET) is a CC sectional view of the same figure (A), Fig. 3 is a diagram of the state of cutting by conventional free abrasive grains, Fig. 4 (A) is a front view of the conventional product, and the same figure (17) is a sectional view taken along line D-D in the same figure (a),
FIG. 5 is a load-elongation curve diagram in the present invention.

1... Thin plate blade, 5... Hard abrasive grain, 6, 6a.
...Arc-shaped notch.

Claims (2)

[Claims] (1) In a cutting tool formed by electrodepositing hard abrasive grains on the side edge of a thin plate, a plurality of arcuate notches are formed on the side edge, and the hard abrasive particles are electroplated except for the arcuate notches. A cutting tool characterized by the fact that the cutting tool is (2) The cutting tool according to claim 1, wherein the arc-shaped notch is also formed on the non-electroplated side edge of the thin plate.