JPH0735731Y2 - Diamond band saw - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention relates to a diamond band saw used for cutting glass, ferrite, quartz and the like.

[Prior Art] A diamond band saw is used as a cutting tool for cutting glass, ferrite, crystal and the like. This diamond band saw has a structure as shown in FIG. 3, for example.

In the figure, 10 is a strip steel plate having flexibility, notches 11 are formed on one side of the notches at equal intervals by punching or grinding, and each tooth-like protrusion 12 is formed between these notches 11. Diamond tip containing diamond abrasive grains 13
Is fixed. The diamond band saw thus formed is formed by joining both ends of the strip steel plate 10 to form a bandless end and suspending it on a cutting device, or a linear one is tension-supported by the cutting device. The material to be cut is cut in a rotating state or in a reciprocating band saw state.
The cutout portion 11 is provided to release chips and dissipate heat when the temperature of the diamond tip rises during cutting.

During the cutting work, the cutting is performed with water or cutting fluid covering the cut portion.

[Problems to be solved by the invention] At the time of cutting work, the saw moves at high speed.
The diamond tip receives more force than the material to be cut.

Therefore, as the use of the saw progresses, empirically, in the case of the one having the notched section having a short cross section that is open upward in the drawing, a crack is generated from the corner C, and the life of the saw ends due to its expansion.

In order to avoid this, a notch as shown in JP-B-43-21032 and JP-B-54-8917, which has a U-shape or a keyhole shape that opens upward, is used. According to the one having the notch of this shape, the occurrence of the crack is improved,
Although the life of the saw is extended, there is a problem that cracks are introduced from the part that contacts the bottom of the notch, and the expansion of the cracks also extends the life of the saw.

[Means for Solving the Problems] The present invention has been made in order to solve the above problems, and is a notch that opens to one side end on one side in the length direction of a strip steel sheet forming a saw. Characterized by providing a rounded portion at both corners where a cross section forming the cutout portion of the bottom portion of the cutout portion as viewed from the one end and the front and back plate surfaces of the steel sheet are rounded. It is a thing.

Although it will be described in detail later, originally, by cutting, punching, etc., a corner is formed at a corner where a cross section forming a notched portion that becomes a sharp edge and the plate surface of the steel plate are rounded, and the portion is mirror-finished. , The durability of diamond band saws is significantly increased.

The present invention will be described below with reference to the embodiments shown in the drawings.

In FIG. 1, reference numeral 1 is a strip steel plate, and its material is, for example,
SK5 is used. On one side of the strip steel plate 1, the narrow portions n are opened at one end of the strip steel plate 1 at regular intervals in the length direction, and in a direction orthogonal to the length direction of the strip steel plate 1, The keyhole-shaped notch 2 is formed by punching or grinding, for example, and the tooth-shaped protrusion 3 is formed between the keyhole-shaped notches 2 adjacent to each other.

Although not shown, each tooth-shaped protrusion 3 is provided with an engagement groove for the diamond tip 4 and a separately manufactured diamond tip 4 is fitted and fixed with silver brazing, or directly by diamond abrasive grains or bonding. Sintering may be performed using a metal, or diamond chips may be formed by fixing diamond abrasive grains to the metal layer using an electrolytic plating method.

A semi-circular portion of the circular portion of each keyhole-shaped notch 2 farther from one end of the strip steel plate 1, that is, a sharp edge at which the cross section 5 of the strip steel plate on the bottom side and the plate surface of the strip steel plate intersect. A roundness R of R0.05 to 0.1 mm is given to the part which is provided, and a mirror finish is given to this rounded portion. The roughness of this mirror finish is within 0.6 μm Rmax, and this mirror finish is performed by buffing, for example.

This mirror finishing work may be performed before or after the diamond tip 4 is fixed to the tooth-like protrusion 3.

The dimensions of one product example are as follows: strip steel thickness 0.4 mm, width 65 mm, keyhole-shaped notch spacing 8 mm, keyhole-shaped notch narrow width 2 mm, Round part diameter 4m
m, the lateral length of the diamond tip, and the height of 3 mm, the width of the tip cutting facing surface is 0.9 mm, and the total length is 3700 mm
Then, it is formed endlessly and used.

The diamond band saw configured as described above,
It is used with water or cutting fluid flowing.

FIGS. 2 (a) and 2 (b) show an embodiment in which the notch has a U-shape. A U-shaped notch 6 having an arcuate shape is formed in the same manner as the embodiment of FIG. 1, and the arcuate cross section serving as the bottom of both side surfaces of the notch 6 and the plate surface of the steel plate are formed. Rounded corners are applied to the intersecting corners, and a mirror finish is applied to this part.

In addition, although not shown in the drawings as an example, a triangular notch is formed on one side of the strip steel sheet, and the sharp tip of the acute angle portion that serves as the bottom is rounded so that it is lower than the middle half of the notch. The corners where the cross section forming the notch and the plate surface of the steel plate intersect, including the pointed portion, may be rounded for mirror finishing.

As described above, the most characteristic feature of the present invention is that in the notches provided at equal intervals on one side in the length direction of the strip steel plate,
At least the bottom portion of the cross section of the strip-shaped steel sheet forming the cutout portion, that is, the edge of the corner where the cross section of the cutout portion on the side close to the longitudinal centerline of the strip steel sheet and the front and back plate surfaces of the steel sheet are It has a rounded surface and a mirror finish.

As a result, minute cracks at the corners where the cross section forming the notch and the plate surface of the steel sheet, which are caused by punching or cutting for forming the notch, intersect with the edge, and vibration during use and local The cracks are enlarged due to such distortion, and the defect that finally breaks is eliminated. Further, the local strain is remarkable as a tensile force applied to the outside of the band saw when the diamond band saw is used in an endless shape, but since the corners are rounded and become a mirror surface, new cracks occur from this part. It is also suppressed. This rounding also has the additional effect of improving the flow of cutting fluid.

[Test example] Prepare a test piece with a length of 70 mm, a width of 10 mm, a thickness of 0.4 mm, and a material of SK5, and provide this test piece with a narrow hole 2 mm, a circular hole 4 mm in diameter, and a notch in the shape of a key hole. (Comparative example), the same size and material as the test piece of the same size and material as the mirror finished by rounding both sides of the circular section at the lower part of the notch (maximum width 4 mm, depth of the notch is a key hole) One having only a U-shaped notch identical to that of the shape (comparative example) and one having a mirror finish with the same roundness on both sides of the lower circular cross section (example) were made and tested. Both ends of the test piece were fixed by a machine and a bending moment was applied under the same conditions.

As a result of this test, the time to break is shown in Table 1.

From the above test results, it can be seen that the mirror-finished product of the present invention has a keyhole shape and the U-shape has a significantly longer endurance time to break than the non-mirror-finished product.

Comparing the example in which the notch portion has the shape of a key hole with the example in which the notch portion has a U-shape, the former has a longer durability time until breakage. This is because the notch has an almost circular shape due to the narrow part open at one end of the strip steel plate, and during operation, a large force is applied to the grinding part from the running direction of the saw and the direction orthogonal to this. However, it is possible to avoid that the force is concentrated on the cross section forming the notch, and this is considered to be due to the fact that this and mirror surface rounding have been performed.

The above test piece has a bottom of the notch portion closer to the other end of the strip steel plate as compared with the actually used one, and as seen from the above dimensional example, the actually used one has the notch portion. There is a large remaining width between the bottom of the and the other end of the strip steel sheet, and it is presumed that the time lag before breakage will widen in actual use.

[Advantage of the Invention] As described above, the present invention can provide a diamond band saw having a long breaking life as compared with the conventional diamond band saw.

[Brief description of drawings]

FIG. 1 (a) shows one embodiment of the present invention in a horizontal plane, and FIG. 1 (b) shows an enlarged AA cross section of FIG. 1 (a). FIG. 2 (a) shows another embodiment of the present invention in a horizontal plane, and FIG. 2 (b) shows an enlarged cross section taken along line A-A of FIG. 2 (a). FIG. 3 shows an example of a conventionally used diamond band saw on a lateral surface. DESCRIPTION OF SYMBOLS 1 ... Strip steel plate, 2 ... Key-hole-shaped notch part, 3 ... Tooth-like projection part, 4 ... Diamond tip, 5,7 ... Cross section, 6 ... U-shaped notch part.

Claims (3)

[Scope of utility model registration request] 1. A strip-shaped steel sheet is provided on one side in the lengthwise direction with notched portions that are open to the one side end at equal intervals, and at both corners where the cross section forming the notched portion and the front and back plate surfaces of the steel sheet intersect. A diamond band saw, characterized in that at least a bottom portion of the cutout portion is rounded to be mirror-finished, and a diamond tip is fixed to a tooth protrusion formed by the adjacent cutout portions. 2. A strip-shaped steel sheet is provided on one side in the length direction at equal intervals with keyhole-shaped cutouts that open to the one side end at a narrow portion, and the cross section forming the cutout and the front and back surfaces of the steel sheet. At least at the corners that intersect with the plate surface, the rounded portions that form the bottoms of the notches are rounded to give a mirror finish, and diamond tips are fixed to the tooth protrusions formed by the adjacent notches. A diamond band saw that is characterized by 3. A strip-shaped steel sheet is provided on one side in the length direction at equal intervals with U-shaped cutouts open to the one side end, and a cross section forming the cutouts and front and back plate surfaces of the steel sheet. At least at the corners of the two intersecting corners, the rounded part that forms the bottom of the notch is rounded to give a mirror finish, and the diamond tip is fixed to the tooth protrusion formed by the notches adjacent to each other. A diamond band saw characterized by.