JPS591536B2 - Circular saw - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a circular saw, and more particularly to a circular saw having a material grinding member attached to the side surface of the base metal in order to prevent the saw body from being caught in the material and generating heat when cutting the material. Regarding saws.

Imada circular saws are now used in a wide range of cutting operations due to their increased rotational speed and improved cutting tips.

However, on the other hand, the frictional heat of the saw base due to high-speed rotational cutting has become a major problem.

For example, when cutting materials consisting only of homogeneous materials such as ordinary wood or iron rods, a saw with a tip with the optimum cutting speed and optimum hardness can be selected in advance, so some of the heat generated by the saw may be However, when dismantling Shinkansen vehicles, for example, various materials with different thicknesses, Young's modulus, etc., wires, conductors, synthetic resin adhesives, synthetic resin cushioning materials, and many other materials are used. When cutting so-called composite materials in which saws are arranged in one row, the pinching friction of this material becomes a big problem, and it can significantly shorten the life of the saw (and reduce the efficiency of cutting work). This has caused damage to the saw, noise generation during cutting, and other problems.

The present invention aims to solve the problem of heat generation associated with cutting work of such materials and the various problems described above derived therefrom.

A specific example will be described below. FIG. 1 shows a circular saw showing an embodiment of the present invention.

This circular saw 10 has a base metal part 12, as is known per se.
It consists of a cutting tooth section 16 to which a carbide tip 14 is attached.

The alloy part 12 has a stud mounting hole 18 in its center, and three circular material grinding parts 20 arranged at equal angular intervals between the mounting hole 18 and the tooth part 16. It is a provision.

Although the material grinding parts 20 are provided at intervals of 120° in FIG. 1, this is not a limitation in any way. 16, it can be configured in any position and size as long as it does not affect the stiffness of the saw.

As shown in FIGS. 2 and 3, the material grinding section 20 includes a pair of circular plates 22 and 24, and four countersunk screws 26 that clamp these circular plates to the saw base metal section 12. ,28,3
0,32 and a diamond powder layer 34,36 covering these circular plates and the threaded ends.

In the present invention, three material-grinding member mounting holes 38 are formed in the base metal portion 12 at intervals of 120° from each other.

The mounting hole 38 has a reduced diameter part 40 at the center of the thickness of the alloy part,
A flat surface 42 extends in parallel in the radial direction from both ends of the reduced diameter portion 40, and an enlarged portion 44 extends in parallel to the reduced diameter portion 40 from the outer periphery of the flat surface 42 to the side surface of the base metal 12, As a whole, a stepped hole is formed extending from both sides of the alloy to the center of the thickness.

Since the circular plates 22 and 24 have substantially the same shape as each other, only the circular plate 22 will be described.

The circular plate 22 has a grinding member mounting hole 3 provided in the alloy part 12.
It has a smooth portion 46 that fits into the enlarged portion 44 of 8 and is in close contact with the flat surface 42 of the circular plate 22. A reduced diameter leg portion 48 that fits into the reduced diameter portion 40 of the hole 38 is integrally formed on the inner surface of the portion.

Further, a truncated conical portion 50 is integrally formed on the outer surface of the smooth portion 46.

It should be noted here that the thickness of the smooth portion 46 is preferably smaller than the depth of the enlarged portion 44 of the hole 38, so that the truncated conical portion 50 of the circular plate protrudes from inside the alloy portion of the saw. It's good to have that.

The circular plates 22 and 24 have four screw holes spaced apart by 90 degrees, and in the figure, the screw holes in the circular plate 22 are thin holes, so that the pair of circular plates 22 and 24 are connected to each other by reducing the diameter of the alloy. It is removably fixed to the alloy by four countersunk screws 26, 28, 30, and 32 with the portion 40 sandwiched therebetween.

As is clear from the figure, the thickness of the reduced diameter leg portion 48 is the same as that of the reduced diameter portion 40.
The depth is smaller than 14 mm, thereby ensuring that there is no play when tightening with flat head screws.

Diamond layers 34 and 36 are formed by electrodeposition on the pair of circular plates 22.degree. 240 truncated conical portions 50 which are thus fixed to the alloy part 12 by countersunk screws.

In the present invention, the relationship between the width T of the carbide tip 14, the thickness T3 of the base metal portion 12, and the dimension T2 between the outer surfaces of the diamond layer 34°36 is 'rt>T2>T3. .

Furthermore, the diamond layers 34 and 36 have conical introduction portions that gradually have a thickness of T2 from the base metal portion 12 having a thickness of T3.

The present invention has such a configuration, so that when the teeth 16 cut the material and gradually bite into the material, the elastic force or inherent restoring force of the material causes the material to become part of the alloy of the saw. 12 is compressed, but the material grinding portion 20 is slightly thicker than the thickness T3 of the base metal portion 12, and its elastic force is Grinds the material that is compressed by the grinder.

For this reason, the cutting surface of the material that attempts to pinch the alloy part 12 with a thickness of T3, which occupies most of the side surface of the saw 10, is ground by the diamond layer 34° 36 with a thickness of T2, which is thicker than T3. Generally speaking, the action of squeezing the alloy portion 12 does not occur, and even if it does occur, the squeezing force will be very small.

Therefore, heating of the base metal portion is significantly reduced.

Generally, the amount of heat generated by the saw itself during cutting work is
It is thought that it is proportional to the clamping force on the pyrometallic part due to the elastic force or restoring force inherent to the material to be cut, the relative speed between the material and the saw, and the working time.

According to the configuration of the present invention, the thickness T2 of the grinding part 20 is somewhat larger than the thickness T3 of the conventional saw, and although it is thought that the clamping force will increase somewhat due to this, the working time will be shorter than that. Since the amount of heat is significantly reduced, the amount of heat generated is relatively significantly reduced.

FIG. 4 shows a second embodiment of the invention.

The difference from the first embodiment (FIGS. 1 to 3) is that the material grinding section has an elongated oval shape in the radial direction of the saw.

In this case, as a result of experiments conducted by the applicant, it has been found that a better effect can be obtained by arranging the long axis of the grinding portion somewhat rearward in the direction of movement of the saw with respect to the radial direction of the saw.

In the illustrated example, a diamond layer is electrodeposited on the grinding part, but
Similar effects can be obtained with a layer of cemented carbide powder in addition to the diamond layer, depending on the material to be cut.

Furthermore, similar results may be achieved by sintering these layers in addition to electrodeposition.

As described above, the present invention is designed to prevent the amount of heat generated when cutting materials with a circular saw, to prevent vibration and noise of the circular saw, and to extend the life of the circular saw. The thickness of the alloy part is T3, although it is smaller than the set size T1.
A thicker material grinding portion 20 is provided, thereby grinding the cutting surface of the cutting diameter material, thereby reducing the clamping force on the alloy part of the material to achieve the intended purpose.

According to the present invention, the grinding portion 20 grinds the cut surface of the material, but the amount of grinding does not cause cutting errors due to the relationship T3 < T2 < Tt, and when the grinding layer of the grinding portion is worn away. Since the saw is removable so that only that part can be replaced, the life of the saw can be easily extended.

Although the saw of the present invention can be used to cut materials, it is particularly effective in cutting composite materials made of various materials.

[Brief explanation of drawings]

FIG. 1 is a plan view showing the first embodiment of the present invention, FIG. 2 is a partially sectional plan view showing the grinding part of the present invention, and FIG.
A view taken along arrow 3-3 in the figure and FIG. 4 show a plan view showing a second embodiment of the present invention. Explanation of symbols, 10...Circular saw, 12...Base metal part, 16
...Mixture tooth part, 18...Rivet mounting hole, 20...Material grinding part, 22, 24...Plate member, 26.2B, 30
゜32...Fixing means, 34, 36...Grinding layer.

Claims (1)

[Claims] 1. At least one grinding portion with a thickness of T2 is provided in the alloy portion with a thickness of T3 between the cutting tooth with a set size of T1 and the rivet mounting hole in the center. , each dimension is T
A circular saw characterized by having a relationship of s < T 2 < T I. 2. The circular saw according to claim 1, wherein the grinding portion is made of a diamond layer. 3. The circular saw according to claim 1, wherein the grinding portion is made of a cemented carbide chip powder layer. 4. The circular saw according to claim 1 or 2, wherein the grinding portion is circular. 5. The circular saw according to claim 1 or 2, wherein the grinding portion has an approximately elongated elliptical shape in the radial direction of the circular saw. 6. The grinding portion according to claim 1.2, 3, 4 or 5, wherein the grinding portion comprises a pair of plate members, a fixing member fixing them to the saw base metal part, and a grinding layer surrounding them. Circular saw.