JPS58160012A - Throw-away cutter - Google Patents

Abstract

PURPOSE:To cut at a stroke even a large abnormal projection on the surface of a work by giving a main cutting blade ridge longer than those of other tips to at least one of several cutting tips set to a tool body. CONSTITUTION:The lower side part of the main blade ridge 23 of one blade tip 15 and the main blade ridge 24 of another blade tip 16 equivalent to the length of the main blade ridge 23 is designed to make intended cutting operation to a work. Comparatively small projections on the work surface are shaved securely by the upside part of the main blade ridge 23 and the middle part of the main blade ridge 24. Large abnormal projections on the work surface are securely shaved mainly by the upside part of the main blade ridge 24.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a two-index indexable cutter in which a plurality of cutting tips are attached to the tip of a tool body along its circumferential direction.

This cypress cutter is used, for example, as a front cutter, polling cutter, or side cutter.
Cutting blade chips are added to a plurality of chip mounting portions provided at the tip of the tool body so that they can be replaced with new ones of the same shape as appropriate.

Generally, in such a cutter, each chip placement part of the tool body has a groove shape that corresponds to only one type of cutting edge chip. Only the /II cutting blade tip could be installed.

By the way, as such a cutter, for example, as shown in FIG. 1, there is a face milling cutter having a chip placement part 2 as a so-called through groove extending from the inner circumference side to the outer circumference @ of the tool body 1. When the cutting blade chip 3 is tightened from the thickness direction using a wedge member on the chip mounting portion 2, the tightening is strong, so that various types of cutting blade chips 3 can be attached to the chip mounting portion 2. As a result of various studies, it was found that it was possible to install the However, when attaching the cutting edge tip 3 to the tip mounting portion 2 serving as the through groove, the base surface 6 of a separately prepared setting jig 5 or the like is directly abutted against the sub-cutting edge 4 of the cutting edge tip 3. In particular, in order to position the cutting edge tip 3, the auxiliary cutting edge 4
It has been particularly difficult to set the cutting edge tip 3 on the machine because there is a risk of damaging the cutting edge and a setting jig 5 is required.

Therefore, the present applicant has previously proposed an indexable second cutter that has excellent compatibility of various cutting blade tips with respect to the tip mounting portion and excellent accuracy in mounting the tips, as well as various other effects. 1984-2) 3170).

As shown in FIG.
The cutting blade tip 11 is positioned by this base surface 1o and the radial positioning base surface 12 of the cutting blade tip 11 in the mounting portion 8, and then the tool body 7@ The cutting blade tip 11 is attached to the tip mounting portion 8 by a wedge member 13 fixed to the tip J.

However, in both of these tools as shown in FIG. 7 and FIG. Met.

For this reason, if there is an abnormally large protrusion on the workpiece surface, it is necessary to perform one-time cutting in stages or to use a cutter with a large chip size, which is extremely uneconomical. Ta.

Conventionally, a tool body has been fitted with a shaped cutting tip. For example, in order to smooth the finished surface, a rough cutting tip that slightly protrudes from the front side of the tool body has been attached, or a step tool has been used. In order to increase the depth of cut of the main cutting edge depending on the cutting method, it is known that a tool body is provided with a dedicated groove-shaped chip mounting portion for each cutting edge chip.

However, depending on the former wiper tip method, large abnormal protrusions on the surface to be machined cannot be removed all at once, and therefore the above-mentioned problems have not been solved at all.

In addition, while the latter step cut method allows the main cutting edge to increase the depth of cut, it also uses a special cutter with a dedicated groove-shaped chip placement part, which reduces the number of chips that can perform a given cutting action. As the amount decreases, another problem arises in that the cutting efficiency deteriorates.

This invention was developed in consideration of the above-mentioned circumstances, and at least one of the plurality of cutting tips attached to the tool body has a main cutting edge that is longer than the others. It is an object of the present invention to provide a second throw-away cutter that can cut even large abnormal protrusions on a workpiece surface at once, thereby solving the above-mentioned conventional problems.

An embodiment of the present invention will be described below with reference to FIGS. 3 to 7.

In this embodiment, a different type of cutting tip 15, 16 is used for a tool body 14 similar to that shown in FIG.
is attached to the front price.

That is, at the tip of the tool body 14 whose base end is attached to the spindle of a machine tool, chip rests 17 of the same shape are provided at equal intervals along the circumferential direction. The outer periphery of each chip mounting portion 17 is spaced outward K14fl, and a base surface 19 is formed by a projection 18 on the inner peripheral side. By the direction positioning base surface 20, the cutting edge tip 15,
A wedge member 21 of different types corresponds to the same or each cutting blade tip.
and clamp screws 22, various types of cutting blade chips can be attached to each chip mounting portion 17 so as to be replaceable as appropriate.

A type of cutting edge tip 15, 16 is attached to each of these three tip mounting portions 17 so as to be alternately positioned along the circumferential direction of the tool body 14. .

One cutting edge tip 15 has a square shape with a long main cutting edge 23 that is suitable for the predetermined cutting action of the main face 7 rice on the workpiece, and the other cutting edge tip 16 has a square shape. One cutting edge tip 15 has a relatively large rectangular shape with a longer main cutting edge ridge 24 than the main cutting edge 23.

According to the indexable second cutter as a face milling cutter configured in this way, one cutting edge tip 1
5, and the lower part of the main cutting edge 24 of the other cutting edge 16, which is opposite to the long part of this main cutting edge 23.
s is sufficient to produce a predetermined cutting action on the workpiece.

By the way, the relatively small protrusions on the workpiece surface are mainly the upper part of the main cutting edge ridge 23 of one cutting edge tip 15,
Main cutting edge 2 of the other cutting edge tip 16 corresponding to this part
The middle part of 4 will surely scrape off.

For example, when cutting a black skin of a relic or a forged product, if there is a large abnormal protrusion on the workpiece surface and the depth of cut increases momentarily, the abnormal protrusion will mainly be caused by the other cutting edge tip 16. The upper part of the main cutting edge ridge 24 in FIG.

In this manner, according to the present face milling cutter, regardless of the presence or absence of a large abnormal protrusion on the surface to be machined, the other cutting blade tip 16 simultaneously cuts off the abnormal protrusion at the same time as the predetermined cutting process.

In the above embodiment, the two cutting chips 16 with long main cutting edges are attached to the tool body 14 so as to be alternately positioned with the other chips. The installation of the long cutting edge tip 16 is a number, and the tool body 14! The setting of the positional relationship between the cutting edge tip 16 and other parts relative to /c is not specified in the above embodiment and is arbitrary.

Also, among the IIIM cutting tips attached to the tool body ITIc as shown in Fig. 1, one with a longer main cutting edge than the others may be combined, and the cost is
It is sufficient that at least one of the plurality of cutting chips attached to the tool body has a longer main cutting edge than the others.

As explained above, in the indexable cutter according to the present invention, at least one of the plurality of cutting chips attached to the tool body has a longer main cutting edge than the others. At the same time as the prescribed cutting process,
It is possible to cut even large abnormal protrusions on the workpiece surface in one go, making it possible to easily, reliably, and efficiently process workpiece surfaces with large abnormal protrusions, and all the cuts can be made as easily as before. It is not necessary to use a large-sized blade tip or to cut a large number of times, and it is extremely economical.

[Brief explanation of the drawing]

Fig. 1 is a vertical cross-sectional view of a conventional indexable cutter, Fig. 2 is a longitudinal sectional view of a throwable cutter previously proposed by the applicant, and Fig. 3 is a portion showing an embodiment of the present invention. The front view, Figure 1 is a sectional view of the main part along the line ■-IV of Figure 3, Figure 3 is a view from the ■ arrow of Figure μ, and Figure 1 is a cross-sectional view of the main part of Figure 3.
FIG. 7 is a sectional view of the main part taken along the line, and is a view taken in the direction of the ■ arrow in FIG. 6. 14... Tool body, 15.16... Cutting edge tip, 23.24... Main cutting edge ridge. Applicant Mimugin - Co., Ltd. Figure 1

Claims (1)

[Claims] In a throw-away two cutter in which a plurality of cutting tips are attached along the circumferential direction to the tip of a tool body that is attached to a spindle of a machine tool, at least seven of the plurality of cutting tips are Throw-away 2 cutter characterized by a longer main cutting edge than the previous one.