JPS6099512A - Throw-away tips for cutting tools - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a narrow-away cutting tool for cutting metal.

Conventionally, in the bottom view shape of a cutting tool for metal processing, especially a Beaufret end mill, the cutting edge forms a curve that is convex with respect to the rotation direction of the tool, and the cutting edge curve at the outer periphery is closer to the center (=1). Cutting tools configured so that the cutting edge curve has a larger curvature are mainly used for cutting difficult-to-cut surfaces with uneven surfaces, such as molds, and are often effective. Are known.

However, since the cutting area of the above-mentioned cutting tool is a heavy cutting field, its cutting edge is intermittently subjected to a large cutting load. Therefore, when using the throw-away method, which is effective in use, if the tip of the tool, whose cutting edge shape is composed of a circular arc and a straight line, is mechanically held in the tool holder, the chip
This problem occurs due to the binding force of the cutting tool, and when used, the chip on the screw or holder becomes loose and the cutting edge of the chip breaks. Most of the cutting tools are brazed type or Mechanically, indexable inserts with a single cutting edge are used as holders, but although these reduce the rigidity of the tool and the looseness of the insert, since they are all single-edged, This poses problems in terms of cost and chip management.

The present invention has been made in view of the above-mentioned problems, and it forms two cutting edges on one chip to reduce tool costs and management costs, and also firmly holds the chip against the tool holder. Throw-away for smooth cutting tools that eliminates backlash, does not cause IJ during cutting, and prevents chipping of the cutting edge, enabling highly efficient machining of uneven surfaces such as molds that are difficult to cut. The purpose is to provide whelk.

In the present invention, the starting end of the convex cutting edge on the surface side of a roughly plate-shaped chip is located near the axial center of the tool body when the chip is removably fixed at a predetermined position on the tool body. The convex cutting edge is continuous with the circular arc cutting edge on the outer circumferential side to have a rectangular shape, and a cutting edge having a rectangular shape relative to the cutting edge is also formed on the back side of the chip. This is an indexable insert for a cutting tool.

Hereinafter, one embodiment of the present invention will be described with reference to the accompanying drawings.

FIG. 1 shows an indexable tip according to the present invention, in which tal is a front view, (b) is a side view of (a),
(Qliyo (a) is a bottom view, and (d) is a bottom view of (al viewed from arrow A). An arcuate cutting edge 11+ is formed along the ridge line formed by the flank 12 which has been given a radius of 11° (11° on the entire circumference in the embodiment) from the cutting edge starting end 15 to above the center of the chip. As shown in (c) and (d) of the figure, the convex cutting edge 15 is formed continuously from the cutting edge starting end 15 and the upper cutting edge is straight or curved.

In addition, the upper surface side of this chip 1 is sloped from the center of the chip as shown in FIG.
5°), and a flat holding surface 17 extending from the rake face 11 to the flank face 1.2a and slightly closer to the cutting edge starting end 15 side. As mentioned above, the effect of providing the holding surfaces 16, 16a and the holding surface 17 on this chip is that the chip mounting formed on the tool holder is possible by providing a vertical wall corresponding to the holding surface in the notch recess. By engaging with the holding surface of the chip, a strong chip/tube restraint is obtained, and chipping of the cutting edge is prevented without causing any chattering or rattling of the chip during cutting. In addition, especially by fitting the holding surface 16.16a with the inclined vertical wall 22 of the recess of the holder, lifting of the chip can be prevented even when the cutting blade receives a cutting load.
The clamping force of the tip only needs to be small, which eliminates damage to the tip tightening bolt, etc., and allows the use of bolts with a relatively small diameter, which contributes to cost reduction.

The cutting edge structure formed on the front surface side 1o of this chip 1 is as described above, but a rectangular shape similar to the above structure is also formed on the back surface side 10a of the chip with reference to the center portion 0 of the chip. That is, the convex cutting edge 15a is formed from the cutting edge starting end 15a, connected to the arcuate cutting edge 111a, and further continued to the second side cutting edge, and the flank 12a is held in a symmetrical position with the above-mentioned one. It has a rectangular shape relative to the aforementioned rectangular shape in which a face 17a and the like are provided, and the ridge line formed by the rake face 11a and the flank face 12a serves as a cutting edge. A port hole 18 for inserting a tightening port is provided in the center of the chip to allow use of the front or back surface of the chip.

Next, the state in which the aforementioned tip is attached to the tool holder will be explained based on FIG. 2.

The tip mounting recess 21 formed by cutting out the spherical end 20 of the tool holder 2 has a tip hole in the center thereof.
・Tighten the hole 18 in a predetermined position corresponding to the hole 18.) 3. A vertical wall 2 with a screw (not shown) carved therein for threading and having an inclination corresponding to the holding surface 16.16a of the tip.
A vertical wall 23 corresponding to the holding surface 17.17a of the chip 1 is formed, and when the chip 1 is mounted, the vertical wall 22.25 and the holding surface of the chip 1 are brought into close contact to make the fixed state of the chips arranged in the holder more stable. and strong.

Furthermore, when the tip is attached to the recess 21 and fixed, the vertical wall is arranged so that the starting end 15° 15a of the cutting edge of the tip is at the center of the tool.
It is formed so that it is located near 1". In addition, 214
is a chip pocket that effectively discharges chips during cutting with this tool.

With the configuration described above, the chip
The two faces and the two vertical walls of the tool holder make it easy for the tip l to be placed in the holder in a normal and stable position and firmly fixed. Also, depending on use, the surface side 10
If the cutting edge becomes open due to wear or other defects, remove the tightening tip/l/l/l/5 and turn the tip over so that the face side 10a is in the normal position and start cutting. can be done easily and in a short time.

As explained above, the present invention enables accurate alignment and strong N (restraint) when attaching tool holder hems and tabs to the tool holder, and also allows the use of two blades. It is an indexable insert for cutting tools that is economical and suitable for heavy cutting of difficult-to-cut materials such as die-sinking cutting.

[Brief explanation of the drawing]

All figures are used to explain the present invention.
Figure 1 shows an indexable tip, (a) is a front view, (b) is a side view of (a), (c) is a bottom view of (a), and (d) is a view of (at as arrow A). Fig. 2 is a front view of the cutting tool when the tip is attached. l...Throwaway tip 2-...Tool holder U...Tighten time [BO] l-10 ... Front side of the chip 1oa... Back side of the chip 11.11a.
... Rake face 12.12a... Relief face 15.
15a... Cutting edge starting end 111.1lla... Arc cutting edge 15.15a... Convex cutting edge 16.16a.
... Holding surface 17.17a... Holding surface 22.2
5... Standing wall 0.01... Center No. 1 Fig. 2 0゜

Claims (1)

[Claims] (1) The starting end of the convex blade on the surface side of the plate-shaped tip will be close to the axial center of the tool body when the tip is removably fixed at a predetermined position on the tool body. At the same time, the convex cutting edge is continuous with the circular arc cutting edge on the outer periphery, and the back side of the chi-sode also has a cutting edge with a relative blade shape. A throw-away knob for a cutting tool characterized by forming a .