JPH0511924Y2 - - Google Patents

Description

[Detailed Description of the Invention] "Industrial Application Field" The present invention relates to a throw-away scallop cutter for cutting a scallop at the connecting end of an H-beam.

``Prior Art'' This type of indexable scallop cutter is disclosed in Japanese Utility Model Application No. 60-7919.

FIGS. 6 and 7 are a plan view and a side view of this throw-away scallop cutter.

Reference numeral 1 in the figure is a cutter main body having a mounting hole in the center, and its outer circumferential surface is formed into a convex curved surface in the shape of an approximately quarter arc that contacts one end surface of the cutter main body 1. Further, on the outer circumferential surface, triangular tips 3 having three arc-shaped side surfaces 2 forming cutting rake surfaces are arranged in a spiral shape from the center side of the cutter body 1 toward the outer circumference side, spaced apart from each other. Ori,
The cutting edge of the tip 3 on the outer peripheral side is configured to face more outward than the cutting edge of the tip 3 on the center side.

``Problems to be solved by the invention'' By the way, in such a throw-away type scallop cutter, since the tips 3 are triangular, the receiving surface of the tip seat is in close contact with the two side surfaces 2, 2 of each tip. If formed in this way, the receiving surface of the chip seat will open due to the wedge effect of the chip 3 after a long period of cutting, causing the chip 3 to wobble. Therefore, as shown in FIG. 8, by forming a slight gap A between the receiving surfaces 4, 4 of the chip seat and the chip side surfaces 2, 2, the wobbling of the chip 3 due to the wedge effect can be prevented. ing.

However, in the case of the tip 3 attached to the outer periphery of the cutter body 1, the material to be cut hits the cutting edge diagonally as shown by the arrow A in Figure 8, causing the tip to rotate in the direction of the arrow B in the figure. Since a moment is generated, the tip 3
rotates around the set screw 5, and the cutting edge position changes as shown by the two-dot chain line in the figure. In addition, in the tip 3 located on the center side of the cutter body 1, the material to be cut hits the cutting blade perpendicularly as shown by the arrow C in Fig. 9, so after a long period of use, the tip 3 This pushes the chip seat receiving surfaces 4, 4 apart, and the position of the cutting edge moves back as shown by the two-dot chain line in the figure. Therefore, the conventional scallop cutter has the disadvantage that the seating stability of the individual triangular chips 3 is poor, and the position of the cutting edge changes easily, making it difficult to sufficiently improve the precision of the cutting surface. It was hot.

Similarly, in such a triangular chip 3, V
Since the tip 3 is positioned by the abutment surface between the receiving surfaces 4, 4, which are positioned at an acute angle in the shape of a letter, and the tip 3, errors in forming the outer shape of the tip 3 and errors in forming the tip mounting hole are amplified. The disadvantage was that this appeared as an error in the position of the cutting edge. For example, if the chip 3 becomes slightly larger due to a molding error and the width W of the contact position between the chip side surfaces 2, 2 and the chip seat receiving surfaces 4, 4 increases by ΔW, as shown in FIG. The tip cutting edge position will be moved forward by ΔL, which is clearly larger than ΔW above. Furthermore, as shown in Fig. 11, if the axial center position of the chip mounting hole is eccentric from 01 to 02 due to a formation error, the contact position between the chip side surfaces 2, 2 and the chip seat receiving surfaces 4, 4 will change. However, the chip cutting edge will be tilted significantly as shown by the two-dot chain line in the figure.

"Purpose of the invention" This invention was made in view of the above circumstances.
To provide a throw-away type scallop cutter with good chip seating stability, high chip mounting strength, and high precision cutting.

``Means for Solving the Problems'' The throw-away scallop cutter of the present invention uses a square tip with four arc-shaped sides, and the two adjacent arc-shaped sides are attached to the tip seat of the cutter body. It is characterized in that it is attached to the cutter body in a state where it is in contact with two adjacent receiving surfaces among the three receiving surfaces.

"Embodiments" Hereinafter, embodiments of the throw-away scalloped ivy of the present invention will be described with reference to the drawings.

Fig. 1 is a plan view showing a throw-away scallop cutter according to an embodiment of the present invention, and Fig. 2 is a -
FIG.

Reference numeral 10 in the figure is a cutter body having a mounting hole in the center, and an outer peripheral surface 10A of this cutter body 10.
is formed into a convex curved surface in the shape of an approximately quarter arc, which is in contact with one end surface of the cutter body 10. and,
On the outer peripheral surface 10A, a large number of square chips 11...
3 toward the outer circumference from the center of the cutter body 10
set screws 12 each.
Fixed by These square chips 11
As shown in FIGS. 3 and 4, the cutter has a square shape with four arcuate side surfaces 13 forming rake faces, and the cutting edge of the square tip 11 is located on the outer peripheral side of the cutter body 10. is configured to face outward from the cutting edge of the square chip 11 on the inner peripheral side.

FIG. 5 is a plan view showing how the square chip 11 is attached. Tip seat 14 of cutter body 10
has three receiving surfaces 14A located in a U-shape, and among these three receiving surfaces 14A, two adjacent receiving surfaces 14A, 14A are adjacent to the adjacent arcuate side surfaces 13, 13 of the chip 11. It is formed so that it touches without any gap. In addition, a tip pocket 15 is provided in front of the tip seat 14 in the direction of cutter rotation.
... are formed adjacent to each other.

In the throw-away type scallop cutter having such a configuration, by making the tip 11 square, there is no risk of deforming the receiving surface of the tip seat due to the wedge effect as in the case of conventional triangular tips. , three receiving surfaces 1 of the tip seat 14
4A..., two receiving surfaces 14A, 14A could be formed so as to come into contact with the chip side surfaces 13, 13. As a result, when the cutting direction is perpendicular to the chip cutting edge, the force applied to the chip 11 can be supported by the entire surface of the side surface 13, and the chip 11
can prevent the retreat of Furthermore, even when the cutting direction of the tip 11 located on the outer peripheral side of the cutter body 10 is oblique to the cutting edge as shown in FIG. The chip 11 can be prevented from rotating by being supported by the two receiving surfaces 14A, 14A.
Therefore, according to this throw-away type scallop cutter, all chips 11 have high seating stability and mounting strength, and the cutting edge position does not change easily even after long-term use, making it possible to cut with high precision. It is.

In addition, in this cutter, the square tip 11
Since the positioning of the tip is performed by the tip seat receiving surface 14A which faces the cutting edge and is located approximately parallel to the cutting edge, the forming error of the tip 11 and the eccentricity error of the tip mounting hole are amplified as in the case of a triangular tip. This has never occurred as an error in the position of the cutting edge, and from this point of view as well, it is possible to improve the accuracy of the position of the cutting edge and the cutting accuracy.

Furthermore, in this throw-away type scallop cutter, the corners of the tips 11 are formed at obtuse angles of 90° or more, so the corners of the tips 11 are less likely to chip, compared to conventional ones using triangular tips. Furthermore, since the square chip 11 can be used repeatedly four times compared to the three times of the conventional triangular chip, it is possible to reduce costs.

In the above embodiment, the entire surfaces of the two side surfaces 13, 13 of the chip 11 are connected to the receiving surface 14 of the chip seat 14.
However, the present invention is not limited to this, and as long as the rotation of the chip 11 can be prevented, the entire surfaces of the two sides 13, 13 of the chip 11 may not necessarily come into contact with the receiving surfaces 14A, 14A. You don't have to let it happen.

"Effects of the Invention" According to the throw-away type scallop cutter of the present invention, the following excellent effects can be obtained.

By making the chip square, there is no risk of deforming the receiving surface of the chip seat due to the wedge effect as in the case of conventional triangular chips, and two of the three receiving surfaces of the chip seat are It is possible to form it so as to be in contact with the side surface of the chip. By bringing the two adjacent arcuate side surfaces of the chip into contact with two adjacent receiving surfaces of the three receiving surfaces of the chip seat of the cutter body, the tip located on the outer circumference side of the cutter body is moved in the cutting direction. Even if the is diagonal to the cutting edge,
The rotational moment applied to the chip can be supported by the two receiving surfaces and rotation of the chip can be prevented, the seating stability and attachment strength of the chip are high, and cutting accuracy can be improved.

Since the positioning of the square chip is done by the chip seat surface that faces the cutting edge and is located approximately parallel to the cutting edge, the molding error of the chip and the eccentricity error of the chip mounting hole are amplified as in the case of the triangular chip. This has never occurred as an error in the position of the cutting edge, and from this point of view as well, it is possible to improve the accuracy of the position of the cutting edge and the cutting accuracy.

Compared to the conventional one using a triangular chip,
The corners of the chips are formed at obtuse angles of 90° or more, making them difficult to chip.

Compared to the conventional triangular chip that can be used three times, it can be used repeatedly four times, reducing costs.

[Brief explanation of drawings]

Fig. 1 is a plan view of a throw-away scallop cutter according to an embodiment of the present invention, Fig. 2 is a sectional view taken along the - line of Fig. 1, Fig. 3 is a plan view showing the tip of the cutter, and Fig. 4 is a plan view of a throw-away scallop cutter according to an embodiment of the present invention. FIG. 5 is a longitudinal sectional view of the chip and a plan view of the main part for explaining the effect of the scalloped cutter of the embodiment. In addition, Figs. 6 and 7 are plan and side views of conventional throw-away scallop cutters, and Figs. 8, 9, 10, and 11 all show problems with conventional cutters. It is a top view of the important part shown. 10...Katsuta body, 11...Square tip, 1
3... Arc-shaped side surface, 14... Chip seat, 14A...
...The receiving side of Chippuza.

Claims (1)

[Claims for Utility Model Registration] The outer circumferential surface of the cutter body is formed into a convex curved surface in the shape of an approximately quarter arc that touches one end surface of the cutter body,
A chip seat with three receiving surfaces located in a substantially U-shape is formed on this convexly curved outer circumferential surface, and a plurality of chips with arc-shaped side surfaces forming the rake surface are formed on this chip seat. are arranged in a spiral shape from the center side of the cutter body to the outer circumference side, and the cutting edges of the tips on the outer circumference side are arranged so as to face more outward than the cutting edges of the tips on the center side. , the chip is formed into a rectangular chip having four arcuate side surfaces, and this chip connects two adjacent arcuate side surfaces of the arcuate side surfaces to one of the three receiving surfaces of the chip seat. A throw-away scallop cutter, characterized in that the cutter is attached to the cutter main body in contact with two adjacent receiving surfaces.