JP2003165020A - Rotating saw - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a rotating saw that easily produces a predetermined clearance non-contacting with chips between a cutting face for bending the chips and a chip guide face and facilitates manufacturing and grinding of a tip. <P>SOLUTION: In the rotating saw, many blade holders 3 are disposed on the outer periphery of a disk-like holder alloy 2, and the cemented carbide tip 4 is disposed on the rotation surface side of the blade holder 3. The rotation surface side of the tip 4 is provided with the cutting face 4b having a predetermined cutting angle A2 from the outer periphery side toward the inner periphery side, a setback a face 4c bending from the cutting face 4b toward the inverse rotation direction, and the chip guide face 4d that bends from the setback face 4c toward the rotation direction and has inner peripheral end 4d-1 projecting more in the rotation direction than the cutting face 4b. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rotary saw for cutting ferrous and non-ferrous materials, which chips are easily fused.

[0002]

2. Description of the Related Art As a conventional technique, Japanese Patent Publication No. 7-4916.
The invention described in Japanese Unexamined Patent Publication No. 8-8, that is, a first rake face forming a negative angle with a tip made of an ultra-hard material fixed to a blade provided on the outer periphery of a base metal, and a flat surface continuous with the first rake face An angled second rake surface, a chip guiding plane continuing to the second rake surface, and a smooth curved surface which is recessed from an extension surface of the chip guiding plane following the chip guiding plane or continuing from a step lowered by one step. A circular saw having a blade bottom formed on a base metal, wherein the chip guiding plane has a length equal to or greater than the length of the second rake face and is connected to the second rake face by a minute curved surface, and At the intersection of the second rake face and the first rake face, the second rake face is tangential to the blade chamber side cylinder having a radius Rc of 2.0 to 4.0 mm. Is formed at a position such that the gap between the minute curved surface and the cylinder having the radius Rc is 0.05 to 0.
There was a rotating saw that was 2 mm.

[0003]

SUMMARY OF THE INVENTION In the above-mentioned prior art, the gap between the second flat rake face and the chip guide plane is bent into a dogleg shape so that the chips do not come into contact with the connection between the two. Since it is not possible to reduce the bending angle of both of them inadvertently, it is necessary to make the connecting portion between the second rake face and the chip guide plane a minute curved surface.
When polishing the second rake face and the chip guiding plane,
It was necessary to maintain the shape of the grindstone with high accuracy, the number of times of polishing was reduced, and it was necessary to use a high-precision polishing machine. Further, when the connecting portion between the second rake face and the chip guiding plane is formed into a minute curved surface, stress concentration occurs in this connecting portion, and there is a problem that cracks easily occur in the connecting portion. It is an object of the present invention to obtain a novel rotary saw that solves the above-mentioned problems by forming the rotating surface side of the tip with three surfaces that bend in a meandering shape.

[0004]

The present invention is configured as follows to achieve the above object. That is, the invention according to claim 1 is a rotary saw in which a large number of blade stands are provided on the outer periphery of a disk-shaped base metal, and a super-hard tip is provided on the rotating surface side of the blade stands. A rake surface having a predetermined rake angle from the outer peripheral side to the inner peripheral side on the surface side, a retreat surface bent in the counter-rotational direction from the rake surface, and a retraction surface bent in the rotational direction from the retreat surface. At the same time, the inner peripheral edge thereof forms a chip guiding surface projecting in the rotational direction from the rake surface. The invention according to claim 2 is such that the rake angle of the tip is a negative angle.

[0005]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings. In the drawings, FIG. 1 is a partial side view of a rotary saw showing an embodiment of the present invention, and FIG. 2 is an enlarged side view of an essential part of FIG. 1 and 2, reference numeral 1 is a rotary saw, for example,
60 blade bases 3 on the outer circumference of the base metal 2 with a diameter of about 360 mm
Are formed at predetermined intervals in the circumferential direction, and super-hard chips 4 are fixed to each rotating surface side of the blade stand 3.

Each of the blade bases 3 has a unequal edge shape in which the side on the rotation surface side rises steeply and the side on the opposite rotation surface side rises gently, and the outer peripheral portion of each blade base 3 on the rotation surface side. Is formed into an L-shaped chip mounting portion 3a, and the block-shaped chip 4 is fixed to the chip mounting portion 3a by brazing or the like. Reference numeral 3b denotes a tooth bottom formed between the respective blade bases 3, which is formed in a side view trapezoidal shape in this example.

The tip 4 has a first rake face 4a and a second rake face 4 on the rotation surface side from the outer peripheral side toward the inner peripheral side.
b, the retracting surface 4c, and the chip guiding surface 4d are formed by bending in a meandering shape. That is, as shown in FIG. 2, the first rake face 4a has a rake angle (angle with respect to the center line D of the rotary saw 1) A1 of about 30 degrees and a radial length L1 of about 0.3 mm. , The second rake face 4b has a rake angle A2.
Is a negative angle of about 2 degrees, the radial length L2 is about 0.5 mm, and the retreat surface 4c has a retreat angle A3 with respect to the center line D of the rotary saw 1 of a positive angle of about 15 degrees and a radial length. L3 to about 0.
5 mm.

The chip guiding surface 4d is provided on the rotary saw 1.
The inclination angle A4 with respect to the center line D of is about 35 degrees, the radial length L4 is about 1.5 mm, and the inner peripheral edge 4d-
1 is projected forward of the second rake face 4b (direction of rotation B of the rotary saw 1), and as shown in FIG. 1, from the second rake face 4b toward the root 3b (center direction of the rotary saw 1). The chips 5a of the flowing workpiece 5 collide with the chip guiding surface 4d. The inclination angle A4 and the radial length L4 of the chip guiding surface 4d are the curvature radius R of the chip 5a.
The radius of curvature R1 is about 4 m in this example.
m, so that the inclination angle A4 and the radial length L are
4 is set.

The connecting portion between the retracting surface 4c and the chip guiding surface 4d is connected by an arcuate surface having a curvature radius R2 of about 0.4 mm to prevent stress concentration at the connecting portion. The radius of curvature R2 is made smaller than the radius of curvature R1 of the chip 5a to prevent the stress concentration from occurring and to make contact with the curved portion of the chip 5a at the connecting portion between the retracting surface 4c and the chip guiding surface 4d. Do not allow the gap C to occur. The retracting angle A3 of the retracting surface 4c and the radial length L
3. The inclination angle A4 of the chip guiding surface 4d and the length L4 in the radial direction are appropriately set according to the size and pitch of each chip 4.

Next, the operation and effect of the above embodiment will be described. As shown in FIG. 1, when the rotary saw 1 is rotated in the direction of the arrow B to cut the workpiece 5 such as a round steel material, the chips 5a of the workpiece 5 are divided into the first and second rake faces 4a, 4b to flow toward the root 3b (direction of the center of rotation of the rotary saw 1) to collide with the chip guiding surface 4d and be curved forward by the chip guiding surface 4d at a preset radius. become.

Further, since a gap C which does not come into contact with the curved portion of the chip 5a is generated at the connecting portion between the second rake face 4b and the chip guiding face 4d, the chip 5a is exposed to the outside air at the gap C. As a result, the chips 5a, which have become hot, are less likely to be fused to the chips 4. Moreover, the radius of curvature R2 of the connecting portion is
Is so large that stress concentration does not occur,
A crack will not be generated from the connection portion.

Further, since the rake angle A2 of the second rake face 4b is a negative angle, the outer peripheral end 4b-1 of the second rake face 4b.
Tangent line T (a line perpendicular to the second rake face 4b in the direction of rotation)
However, it will face the outer peripheral side compared to the tangent line of the rake face forming a conformal angle. Therefore, the chips 5a located on the tangent line T are
The curved center point M of the shavings moves outward in the radial direction of the rotary saw 1, and the lengthened shavings 5a are reversed to the outer peripheral side 5 of the shavings 5a.
The a-1 comes into contact with the workpiece 5 and is smoothly curved, and the chips 5a do not collide with the surface to be machined or collide with the tooth bottom 3b. The first rake face 4a described above may be omitted.

[0013]

As is apparent from the above description, the invention according to claim 1 of the present invention is such that the rake face, the retreat face, and the chip guide face are provided on the rotation surface side of the chip from the outer peripheral side toward the inner peripheral side. Since it is formed by bending in a meandering shape, the bending angle between the rake surface and the chip guiding surface is set to a predetermined value so that the chip curvature radius does not collide with the work surface and the tooth root. While having a curved radius, it is possible to easily generate a predetermined gap between the rake surface and the chip guiding surface, where the chips do not come into contact with each other. Moreover, since the gap can be generated while increasing the radius of curvature of the connecting portion between the retreat surface and the chip guiding surface, the chip can be easily manufactured and polished, and the stress concentration at the connecting portion can be reduced. You can
Higher durability. Further, since the rake angle of the rake face of the tip is set to a negative angle so that the center point of bending of the chips is located on the outer peripheral side of the rotary saw, when long chips are generated, the chips are smoothly curved. It is possible to prevent damage to the work surface or fusion of chips to the work surface, the tooth bottom and the like.

[Brief description of drawings]

FIG. 1 is a partial side view of a rotary saw showing an embodiment of the present invention.

FIG. 2 is an enlarged side view of a main part of FIG.

[Explanation of symbols]

1 rotary saw 2 units 3 blades 3a Chip mounting part 3b tooth root 4 chips 4a 1st rake face 4b Second rake face 4b-1 outer peripheral edge 4c Retreat surface 4d Chip guiding surface 4d-1 inner peripheral edge 5 Workpiece 5a chips 5a-1 Outer peripheral side where chips are reversed A1 First rake face rake angle A2 Rake angle of the second rake face A3 withdrawal angle A4 tilt angle C gap T tangent Curve center point of M chips

Claims (2)

[Claims] 1. Rotation in which a large number of blade stands (3) are provided on the outer periphery of a disk-shaped base metal (2), and super-hard chips (4) are provided on the rotation surface side of the blade stands (3). In the saw, a rake face (4b) having a predetermined rake angle (A2) from the outer peripheral side to the inner peripheral side on the rotation surface side of the tip (4) and the counter rotation direction from the rake surface (4b). A retreat surface (4c) that bends toward the cut surface, and a cut that bends from the retreat surface (4c) in the rotational direction and that has an inner peripheral end (4d-1) protruding in the rotational direction from the rake surface (4b). A rotary saw having a scrap guide surface (4d). 2. The rotary saw according to claim 1, wherein the rake face (4b) of the tip (4) has a negative rake angle (A2).