JPS60180703A - Cutting tool - Google Patents

Abstract

PURPOSE:To tear and effectively disperse chips generated during machining for improved machining speed by providing semi-circular convex portions formed on the rake face of the cutting edge of a cutting tool in slightly spaced relation to the cutting edge end thereof. CONSTITUTION:A cutting tool 10 for milling or lathe turning has a tool body 1 and a cutting tip 2 detachably secured to a portion of the outer peripheral end of the tool body 1. The tool body 1 is partially cut off along the axis thereof, and the cut-off surface has a side formed at an angle to the body 1. A plurality of semi-circular convex portions 3 are formed on a rake face 2' on the cutting surface side of the tip 2 in slightly spaced relation to the cutting edge end of the tip 2. The convex portions 3 are provided along the length of the tip 2 through the length almost the same as that of the tip 2. This construction permits tearing and effective dispersing of chips generated during machining for improved machining speed.

Description

[Detailed Description of the Invention] [Technical Field] The present invention relates to a cutting tool used for milling and lathing. Specifically, the present invention is a cutting tool that is used for milling and lathing. Specifically, the cutting tool has a cutting tool that is designed to cut and disperse chips by using a device near the rake face of the cutting edge of the cutting tool. related to cutting tools.

[Prior art]

Milling cutters that are generally used for milling include flat milling cutters, side milling cutters, end mills, and full milling cutters. For example, a flat milling cutter 100 shown in FIG.
In this example, one or more cutting edges 101 are formed on the outer periphery of a cylindrical main body. Then, the cutter body is rotated and the workpiece is cut by the cutting blade 101. During machining, the cutter body is cut into the groove 102, which serves as a chip gap between the cutting blade 101 and the adjacent cutting blade 101. Care must be taken to avoid tipping. In other words, the rotational speed of the flat milling cutter 100, the thickness of the workpiece to be cut by the cutting blade 101 (the thickness of the cutting tip), etc. must be appropriately adjusted to carry out the machining. This is because the cutting chips scraped off by the cutting blade 101 are not efficiently dispersed outside the groove 102. Therefore, in the past, machining was carried out by adjusting the machining speed and cutting speed, and it was difficult to adjust the machining speed to the desired speed. Measures against chips generated during continuous cutting and automation are important.

〔the purpose〕

The present invention is made in view of the above-mentioned conventional circumstances, and includes:
By providing a live spherical convex portion on the rake surface of the cutting edge of the cutting tool at a minute distance from the edge of the cutting edge, cutting chips generated during machining are cut and efficiently dispersed, The purpose is to provide a cutting tool that can improve machining speed.

(Example) The present invention will be disclosed below with reference to the illustrated embodiments.

A cutting tool 10 which is an embodiment of the present invention shown in FIG.
A cutting blade tip 2 is detachably fixed to a part of the outer periphery of the tip of the tool body 1.

For convenience of explanation, only one cutting blade tip 2 is used, but it goes without saying that a plurality of cutting blade tips may be provided. A part of the worker body 1 is cut out along the axis of the tool body 1, and one side of the cut-out surface is formed at an angle to the outer circumference of the tool body 1, and the cut is made here. The blade tip 2 is removably fixed by brazing or bolts (not shown). A plurality of hemispherical convex portions 3 are formed on the rake face 2- of the cutting edge 2 on the cutting surface side at a portion spaced apart from the cutting edge of the cutting edge 2 by a minute distance.

This hemispherical convex portion 3 is formed to have substantially the same length along the length of the cutting blade tip 2. The hemispherical convex portion 3 is not limited to a sphere, but may have a curved/surfaced outer circumference, for example, its cross section may be circular or elliptical, and its size may be arbitrary. The individual sizes also vary. Moreover, the rake face 2'' from the cutting edge of the cutting blade tip 2 to the hemispherical convex part 3 is raised as if the hemispherical convex part 3 suddenly stands out from the rake face 2- of the cutting blade tip 2. Rather, as shown in FIG.
The distance from the side edge to the point where the hemispherical protrusion 3 starts is not set uniformly, and in the one shown, it is short at the middle part of the cutting edge 2 (and long at both ends). In other words, with respect to the straight cutting blade tip 2, the point where the hemispherical convex portion 3 starts to protrude is curved so that the cutting tip escapes to the outer periphery.

Next, the operation of the cutting tool 10 configured as described above will be explained based on the drawings from FIG. 4 onwards. FIG. 4 shows the state of the cutting tool 10 during machining, in which the cutting tip 2 is cutting the workpiece 4 due to the rotation of the tool body 1.

At this time, the cutting chip 5 generated by the cutting of the cutting blade chip 2
is guided toward the hemispherical convex portion 3 by being guided by the rake face 2- which continues from the tip of the cutting edge tip 2 to the hemispherical convex portion 3 shown in FIG. Cutting tip 5 that has reached the hemispherical convex portion 3 t:
ll, where it is distributed in multiple directions. As shown in FIG. 5, taking one of the hemispherical convex portions 3 as an example, when the cutting tip 5 comes into contact with the hemispherical convex portion 3, the outer periphery of the hemispherical convex portion 3 becomes a smooth curved surface. Therefore, the cutting chips 5 are guided by this curved surface and dispersed in multiple directions. What is important here is the shape of the hemispherical convex portion 3 that disperses the cutting chips 5. For example, unlike a chip breaker formed on a cutting tool, the path through which the cutting chips 5 escape is not in a fixed direction, and the cutting chips 5 The dispersion path of the cutting chips 5 is determined by which position of the hemispherical convex portion 3 the cutting chips 5 contact, and the dispersion direction of the cutting chips 5 can be controlled in multiple directions (see arrows in Figure 5). .

Incidentally, when using cemented carbide as the material for the milling cutter or chip, or for forming the hemispherical convex portion 3 of the present invention on a mold for sintering, electric machining or the like may be suitable. . Also, for convenience of explanation, a single cutting edge tip 2 is shown, but it is also possible to apply it to a device having a plurality of cutting edges, such as the flat milling cutter shown in FIG. Relatively small hemispherical convex part 3 in the groove between the cutting blades
It is easy to implement, as it is only necessary to arrange the following. Further, in the above embodiment, the hemispherical convex portions 3 are arranged in parallel, but the hemispherical convex portions 3 may be overlapped to disperse the cutting chips in more directions. Further, other configurations are not limited to the above embodiments, and various changes are possible.

Figures 6 and 7 show a tip 7 attached to the pie 1 to body 6 of 111111 with a bolt 8, and a hemispherical convex portion 3 is provided on the cutting surface inside the cutting edge at the tip. There is.

FIG. 8 shows a drill 9 with a detachable tip 9,
Figure 9 is a view of Figure 8 viewed from arrow A, and Figure 10 is B of Figure 8.
-B is an enlarged cross-sectional view in the direction of arrows.

〔effect〕

As explained above, the present invention provides a milling cutter that has at least one cutting edge and cuts a workpiece by rotating the cutting blade, and a turning tool that cuts the workpiece by rotating it. A hemispherical convex portion is provided on the rear end side of the surface. Therefore, the cutting chips generated during cutting can be efficiently dispersed in multiple directions by the hemispherical convex portion, and the continuously generated turning chips can be dispersed after cutting with the hemispherical convex portion. As a result, the cutting force is approximately 80% lower than that of a hemispherical convex shape, and the amount of wear on the cutting edge of a milling cutter or cutting tool is approximately 70%, and as a result, the cutting speed can be doubled. I was able to In addition, since the cutting speed can be improved in this way, it can be used for graphite cutting, etc., where the conventional cutting speed must be slowed down, and it is effective when used for cutting iron materials, brass materials, etc. It is. By cutting and dispersing the cutting chips in this way, it is possible to reduce the amount of wear on the cutting tool, thereby increasing the life of the cutting tool and disposing of the cutting chips with 3N! This made it possible to automate milling machines, boring machines, sub-machines, etc.

[Brief explanation of the drawing]

Fig. 1 is a perspective view showing a conventional milling cutter, Fig. 2 is a diagonal 71 view of a cutting tool showing an example 11/i of the present invention, Fig. 3 is a sectional view taken along the line ■-■ in Fig. 2, and Fig. 4 The figure is a cross-sectional view showing the state during cutting, Figure 5 is an enlarged perspective view of the hemispherical convex part, Figure 6 is the tip of the sub-plate cutting tool, and Figure 7 is an enlarged view of the tip part in Figure 6. , Fig. 8 is a front view of the drill with a tip attached, Fig. 9 is a view taken from arrow A in Fig. 8, and Fig. 10 is a view taken from B- in Fig. 8.
8 is an enlarged cross-sectional view. 2... Cutting edge tip, 2-... Rake face 3... Hemispherical convex portion, 5... Cutting depth, 10... Cutting tools. Applicant: Inoue Japax Research Institute, Inc. Agent, Patent Attorney Masu Ro] Takeda Figure 4 Figure 6 Figure 87 Figure 9 Figure A O

Claims (1)

[Claims] 1. A cutting tool that has at least one cutting edge and cuts by relative movement between the cutting edge and the workpiece, the cutting tool having at least one cutting edge, the cutting tool having a small distance from the edge of the cutting edge (of the cutting face of the cutting edge). A cutting tool characterized in that a hemispherical convex portion is provided in the placed portion. 2. A plurality of the hemispherical convex portions are provided in parallel to the cutting edge direction to prevent cutting chips generated when cutting the workpiece. The cutting tool according to claim 1, characterized in that the cutting tool is configured to be dispersed in multiple directions.