WO2001098010A1

WO2001098010A1 - Circular saw for metal cutting

Info

Publication number: WO2001098010A1
Application number: PCT/JP2001/004489
Authority: WO
Inventors: Yasutaka Nakajima; Satoru Nishio; Yuko Oishi
Original assignee: Kanefusa Kabushiki Kaisha
Priority date: 2000-06-20
Filing date: 2001-05-28
Publication date: 2001-12-27
Also published as: JP3895906B2; JP2002001614A

Abstract

A circular saw for metal cutting, comprising a cutting blade tip (20) having an outer peripheral flank (21) with a positive outer peripheral clearance angle and a side flank (22) with a side clearance angle of 0°and connected by brazing or the like onto the outer periphery of the body (11) of the circular saw for metal cutting at the tip seat (13) of a blade body (12) projected in radial outer direction, wherein a recess (27) extending rearward in rotating direction is provided in a corner part (26) formed of the outer peripheral flank and the side flank of the cutting blade tip using, as a base point, a position apart 0.1 to 1.0 mm from the rake side outer peripheral end of the side flank.

Description

Specification

Circular saw for metal cutting

The present invention relates to a circular saw for cutting a metal, and more particularly to a circular saw for cutting a metal which can obtain a remarkable cutting effect by being attached to a circular saw having a saw blade guide. Background art

Conventionally, as this kind of circular saw for metal cutting, a cutting edge chip provided with an outer peripheral flank having a positive outer flank angle and a lateral flank having a lateral flank angle of 0 ° is used as a disk. It is known that a blade body protruding radially outward around the outer periphery of a circular saw body is shaped. This circular saw cuts while contacting the maximum flank of the lateral flank (the maximum part of the amount of lash), generally the outer peripheral end, against the cut surface of the work material. Cutting vibration in the lateral direction of the blade is less likely to occur, and as a result, the roughness of the cut surface is very small, and the quality of the cut surface is maintained well. '' However, in this circular saw for metal cutting, the friction at the outer peripheral end side, which is the maximum clearance of the lateral flank, is severe, and thermal cracks are generated in the vicinity of this. Is apt to occur. Further, in each cutting edge tip, a difference in the lateral load in the saw thickness direction received by the outer peripheral end of the lateral flank from the cut surface of the work material is likely to occur, and the bending is likely to occur. The use of a saw blade guide has an effect of preventing bending, but especially when the base metal (circular saw body) is thin, the rigidity of the base metal is much lower, and the allowable range is exceeded. There was the disadvantage that the saw blade was prone to bend, which shortened the life of the saw blade. Another circular saw for metal cutting is a brazed cutting edge tip provided with an outer peripheral flank having a positive outer clearance angle and a lateral flank having a positive outer clearance angle. It has been known. Since this circular saw has a positive lateral relief angle, the friction at the outer peripheral end, which is the maximum clearance of the lateral flank, is smaller than that of the circular saw described above, so that it is difficult to bend.

However, this circular saw for metal cutting has a positive lateral clearance angle, so there is also a lateral cutting action at the left and right ends of the cutting blade, and there is no possibility that the cutting vibration of the saw blade in the horizontal direction will occur. high. As a result, cutting marks due to vibration are more easily generated on the cut surface, and the quality of the cut surface is reduced. In addition, there is also a problem that the cutting blade is liable to be chipped by the left and right vibration of the saw blade.

The present invention is intended to solve the above-described problem, and has a long service life by suppressing chipping due to friction at a maximum clearance of a lateral flank 面 and a sawing due to a difference in lateral load in a saw thickness direction. It is another object of the present invention to provide a circular saw for metal cutting that can prevent a decrease in quality of a cut surface due to cutting vibration. Disclosure of the invention

According to the present invention, a cutting edge tip provided with an outer peripheral flank having a positive outer flank angle, and provided with a lateral flank having a 0 ° lateral flank angle and a flank angle is provided with a radially outer surface of a circular circular saw body. In a circular saw for metal cutting that is joined to a blade body that protrudes outward in the direction by brazing, etc., the side flank is formed at the corner formed by the outer flank and the lateral flank of the cutting edge tip. A depression extending from the position 0.1 to 1.0 mm away from the outer peripheral end on the side of the rotating surface, which extends rearward in the rotational direction, is provided.

The dimension of the lateral flank from the outer peripheral edge on the rake face side to the depression may be in the range of 0.1 to 1.0 mm, but is preferably in the range of 0.1 to 0.5 mm. If the dimension from the outer peripheral edge of the flank to the rake face is less than 0.1 mm, there will be a lateral cutting action at the left and right edges of the cutting edge. Cutting vibrations occur, and cutting marks due to the vibrations are liable to be clearly formed on the cut surface, and the quality of the cut section is deteriorated. If the dimension is larger than 1 mm, the friction at the outer peripheral end of the lateral flank, which is a drawback when there is no dent, may cause chipping near the side flank, Due to the difference in lateral load, grinding and bending can easily occur.

In the present invention, a base point formed by a corner part formed by the outer peripheral flank and the lateral flank of the cutting edge tip is located at a position separated from the rake face side outer peripheral end of the lateral flank by 0.1 to 1.0 mm. As a result, the portion that comes into contact with the cut surface of the work material during cutting is 0.1 to 0.1 mm from the outer edge of the rake face on the side flank of a general circular saw. 1. Since only the area near the corners up to O mm away, friction with the work material can be minimized, and heat generation due to friction can be suppressed. That is, the friction with the work material on the outer peripheral end side of the lateral flank can be reduced by the depression. In addition, the lateral load in the saw thickness direction at the outer peripheral end of the lateral flank of the cutting edge tip received from the cut surface of the work material can be reduced by the depression, and the difference in the lateral load can be reduced.

As a result, according to the present invention, the occurrence of thermal cracks near the corners can be suppressed, so that the occurrence of chipping of the cutting edge due to the thermal cracks can be suppressed, and the reliability thereof can be improved. Further, according to the present invention, since the difference in the lateral load can be reduced by the depression, the turning of the circular saw can be suppressed, and the life of the saw blade can be prolonged. BRIEF DESCRIPTION OF THE FIGURES

FIG. 1 is an enlarged perspective view showing a blade portion of a circular saw for metal cutting according to an embodiment of the present invention, and FIG. 2 is a side view showing an enlarged blade portion of the circular saw. FIG. 3 is an enlarged plan view showing a blade portion of the circular saw, FIG. 4 is an enlarged perspective view showing a cutting blade tip, and FIG. , Cutting blade FIG. 6 is an enlarged side view showing the cutting edge tip, and FIG. 6 is a plan view showing the cutting edge tip in an enlarged manner. FIG. 7 is a diagram for explaining a method of processing the lateral flank of the cutting edge tip. FIG. 8 is an enlarged perspective view showing a main part of the cutting edge tip. BEST MODE FOR CARRYING OUT THE INVENTION

An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 to FIG. 3 show a blade-type circular saw for metal cutting (hereinafter referred to as a circular saw) according to the embodiment. FIG. 4 is a perspective view, a side view and a plan view of the portion, and FIGS. 4 to 6 are perspective views, side views and a plan view of the cutting edge chip.

The disk-shaped circular saw body 11 is provided with a blade body 12 formed so as to protrude radially outward from a plurality of locations on the outer periphery, and the blade body 12 is provided on the rotation direction front side from the outer side. An L-shaped chip seat 13 is provided which is cut out substantially in the radial direction and perpendicularly to the radial direction from the rotating front side. A cutting edge tip 20 is fixed to the tip seat 13 by brazing or the like.

As shown in FIGS. 4 to 6, the cutting edge tip 20 has a cubic block shape and an outer peripheral flank 21 having a positive outer clearance angle (3 ° to 20 °). A pair of lateral clearance surfaces 22 having a lateral clearance angle of 0 ° and a positive clearance angle (0.5 ° to 5 °), a rake surface 23, and a vertical bearing surface 1 of the chip seat 13; A back surface 24 and a bottom surface 25 that are in close contact with 3 a and the horizontal seating surface 1 3 b are provided.The outer flank 21 has a single swarf dividing groove 2 1 a extending in the rotation direction on the right. It is located closer or to the left. The rake face 23 is a slope inclined to the rear side of the rotation, and is provided with a concave part 23 a that is shallowly concave in an arc shape within a predetermined range from a position near the outer peripheral side to a center side. .

Set the lateral flank of the cutting edge tip 20 to a lateral clearance angle of 0 ° and a positive clearance angle (central angle). As shown in FIG. 7, the circular saw body 11 is rotated, and a pair of cup grinding stones 15 are provided on both side surfaces of the cutting edge tip 20 on the outer peripheral side, as shown in FIG. This is performed by grinding the lateral flank 22 by contacting while rotating. Further, the outer peripheral flank 21 is subjected to outer peripheral grinding so as to have a predetermined outer flank angle, and both corner portions 26 where the outer flank 21 and the lateral flank 22 intersect are chamfered. 0 is cut and finished, but chamfering is not always necessary.

As shown in detail in FIG. 8, both corners 26 have a dimension a = 0.1 to 1.0 mm away from the outer edge of the rake face 23 of the lateral flank 22. A pair of recesses 27 extending from the point a to the rear surface 24 toward the rear of the rotation is provided. The depression 27 is a concave portion having an arc-shaped cross section and is formed when the cutting edge tip 20 is formed. Therefore, it is not necessary to form it in the circular saw manufacturing process. Also, compared to forming a land on the rake face side of the lateral flank having a lateral relief angle instead of the depression 27, the depression 2 The formation of No. 7 does not increase the production cost of circular saws.

In the circular saw to which the cutting edge chip 20 is attached, the two corner portions 26 formed by the outer peripheral flank 21 of the cutting edge chip 20 and the pair of lateral flank 22 are provided. Due to the provision of the recess 27, the portion that comes into contact with the cut surface of the work material during cutting, as shown in Fig. 8, has a lateral flank between the rake face and the recess 27. Since there is only the small area 22 (the shaded area) of 22, the friction between the lateral flank 22 and the workpiece can be minimized, and the heat generated by the friction can be suppressed. That is, the friction with the work material on the outer peripheral end side of the lateral flank 22 can be reduced by the depression 27. As a result, the generation of thermal cracks in the vicinity of the corner 26 of the cutting edge tip 20 can be suppressed, and the occurrence of chipping of the cutting edge tip due to the thermal crack can be suppressed. At 20, the outer peripheral edge of the lateral flank 22 is the cut surface of the workpiece The lateral load in the thickness direction of the saw can be mitigated by the recesses 27, and the difference in the lateral load can be reduced, so that the turning of the circular saw can be suppressed and the life of the saw blade can be prolonged. Can be.

In the above embodiment, the circular saw is attached to a circular saw having at least two sets of saw blade guides before and after the work material cutting position, so that the above-described cutting effect is further improved. Although notably obtained, the effect of using the above-mentioned cutting edge tip can also be obtained by mounting it on a circular sawing machine without a saw blade guide. If the side flank with a negative or 0 ° clearance angle is continuous from the corner, the recess 27 is extended toward the center of the circular saw and formed to the range of the negative or 0 ° clearance angle of the side flank. It is desirable to do.

Industrial applicability

As described above, a remarkable cutting effect can be obtained by using the circular saw for metal cutting of the present invention attached to a circular sawing machine having a saw blade guide.

Claims

The scope of the claims

1. A cutting edge tip provided with a peripheral flank with a positive peripheral flank and a lateral flank with a lateral clearance of 0 ° protrudes radially outward at the outer periphery of the circular saw body. Circular saw for metal cutting, which is joined to a braided blade by brazing, etc.

The corner formed by the outer peripheral flank and the lateral flank of the cutting edge tip is rotated around a position 0.1 to 1.0 mm away from the outer peripheral end of the flank of the lateral flank. A circular saw for cutting metal, comprising a recess extending rearward.