JPS60164B2 - Split type milling tool - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to milling tools such as side milling cutters and face milling cutters.

Conventionally, a milling tool configured as shown in FIGS. 1 and 2 is known as an example of a milling tool. The cutter body 1 has an arbor hole 4 formed along the central axis in the center of the cutter body 1, and an appropriate machining can be carried out through the arbor hole 4. It is configured to be attached to a machine.

When the milling tool having the above configuration is mounted on, for example, a horizontal milling machine, the arbor hole 4 is fitted into the arbor 6 attached to the spindle 5 as shown in FIG. Step 8 to position and install. Generally speaking, milling tools are relatively frequently attached to and removed from machine tools, such as to replace or re-grind the cutting tip 2, or to replace with other milling tools. When removing the conventional reshaping tool configured as shown in FIG.
and then remove the arbor bearing 12 and collar 8.
I had to remove it and do it.

Therefore, in the case of the above-mentioned secondary milling tool, it takes time to attach and detach the tool, which causes the inconvenience of lowering the operating rate of the machine.Furthermore, the cutter body 1 is formed as a single piece. Due to its heavy weight, it has the drawback of poor ease of attachment/detachment or replacement, as well as poor safety.
The present invention was made in view of the above circumstances, and it is an object of the present invention to provide a milling tool that can be quickly, safely, and easily attached to and detached from a machine tool.

Embodiments of the present invention will be described below with reference to FIGS. 4 to 14.

FIGS. 4 to 11 show a side milling cutter as an example of a cutting tool according to the present invention. As shown in the two figures, the side milling cutter includes an adapter 22 iron-mounted on the arbor 21, and It is comprised of a pair of cutter bodies 23 attached to an adapter 22, and each will be explained in turn below. First, as shown in FIGS. 4, 6, and 7, the adapter 22 has a
A steel matching groove 25 with a rectangular cross section is formed in the circumferential direction, and both side wall surfaces 26, 26 of this competing groove 25 are precisely formed to regulate the position of the cutter body 23 in the inguinal direction. The outer circumferential surfaces 27, 27 of the cylindrical portion 24 are finished with high precision so as to regulate the position of the cutter body 23 in the radial direction.

Furthermore, keys 28 projecting in the radial direction are attached to predetermined locations on the outer circumferential surfaces 27, 27 of the cylindrical portion 24 with setscrews 29, as shown in FIGS. 5 and 7. On the other hand, a plurality of threaded holes 30 are formed at the bottom of the iron fitting groove 25 of the cylindrical portion 24 at equal intervals in the circumferential direction and each extending in a direction substantially perpendicular to the central axis, that is, in a substantially radial direction. ing. An arbor hole 31 as a mounting hole is formed in the center of the adapter 22 along its central axis, and the periphery of both the front and rear closed ends are precisely ground to form a boss surface 32 there. The arbor hole 31
A key groove 33 along the koji line direction is formed at a predetermined location on the inner circumferential surface of. Next, as shown in FIGS. 5, 9, and 10, the cutter body 23 is inserted into the cylindrical portion 24.
An inner circumferential surface 34 having approximately the same diameter as the outer circumferential surfaces 27, 27 is formed, and a convex portion 35 which engages the iron fitting groove 25 is formed on this inner circumferential surface 34 so as to protrude radially inward. The overall structure is approximately semicircular.

By the way, both side surfaces of the convex portion 35 are in contact with the iron matching groove 25.
The projecting length is formed to be slightly shorter than the depth of the competition groove 25, so that the protrusion 35 is closely connected to the formation groove 25.
The tip surface of the convex portion 35 is configured so as not to come into contact with the bottom surface of the concave groove 25 when the convex portion 35 is fitted. Further, a plurality of chip mounting seats 36 are formed at equal intervals on the outer periphery of the cutter body single body 23, and each chip mounting seat 36
Attach the cutting tip 3 with the wedge 37 and bolt 38.
9 are removably attached in the same posture. In addition, at both ends of one cutter body unit 23, that is, at one of the ends that face each other when the pair of cutter body units 23 are assembled to the adapter 22, a sub-joint is provided for filling the gap between the respective ends. Plate 4 as a member
0 is attached with a threaded screw 41, and when the pair of cutter bodies 23 are assembled to the adapter 22, each cutter body 23 is substantially integrated to form a complete annular shape. has been done. Furthermore, the adapters 22 are arranged at equal intervals in the circumferential direction at the central part of each cutter body 23 in the axial direction.
A through hole 42 having approximately the same diameter as the screw hole 30 is formed at a location corresponding to the screw hole 3 formed in the through hole 42.
The closed end on the outer peripheral side of the bolt is counterbored to form a bolt seat 43 there. Further, on both side walls of one cutter body single unit 23, there are keys 2 attached to the adapter 22.
A keyway 44 is formed corresponding to 8. The means for fastening the cutter body unit 23 to the adapter 22 is a screw 46.

That is, the vertical screw 45 is inserted into the through hole 42 formed in the cutter body single body 23 and screwed into the screw hole 30 of the adapter 22, so that the bottom surface of the head is aligned with the bolt seat 43.
The cutter body 23 is pressed against the outer peripheral surfaces 27, 27 of the cylindrical portion 24 of the adapter 22. Next, the operation of attaching and detaching the side milling cutter 20 configured as described above to the arbor 21 will be explained.

First, after placing a predetermined number of collars 47 on the arbor 21 attached to the spindle of a predetermined machine tool, the adapter 22 is positioned using an iron bag, and at the same time, the key 48 is inserted into the key groove 33 to prevent rotation. Then, the adapter 22 is fixed by attaching another collar 49 to the arbor 21. On the other hand, a cutting tip 39 is attached to each cutter body unit 23 as described above, and a plate 40 is attached to the end of one cutter body unit 23 by attaching a screw 4.
Fix it at 1. Then, while engaging the keys 44 formed on both side wall surfaces of one cutter body single body 23 with the keys 28 attached to the outer peripheral wall surfaces 27, 27 of the cylindrical portion 24, the one cutter body single body 23 is attached to the adapter 2.
2, and the other cutter body alone 2.
3 to the outer circumferential side of the adapter 22 in the same manner. At this time, the convex portion 35 of the cutter body unit 23 is iron-fitted into the saddle fitting groove 25 of the adapter 22. Thereafter, the tightening screw 45 is inserted into the through hole 42 and screwed into the screw hole 301. Then, the bottom surface of the head of the follow-on screw 45 is inserted into the through hole 4.
As a result, the convex portion 35 of each cutter body 23 lands on the mating groove 25 of the adapter 22, and the position of the cutter body 23 in the koji line direction is regulated. Inner peripheral surface 3 of cutter body single body 23
4 are pressed against the outer peripheral surfaces 27, 27 of the adapter 22, and each of the cutter bodies 23 is fixed to the adapter 22. Each cutter body single unit 2 fixed in this way
3, by attaching a plate 40 to the end of one cutter body 23, the cutter body 23 is substantially integrated into a complete annular body, which makes it possible to perform cutting with a large cutting load such as intermittent heavy cutting. This will not cause any inconveniences such as fluctuations in the mounting condition of each cutter body 23, abnormal vibrations caused by this, or breakage of the cutting tip 39. In addition, when operating the vertical screw 45, since the tightening screw 45 is screwed in the radial direction of the adapter 22, the arbor 21 to which the side milling cutter 20 is attached, the collars 47, 49, and each cutter body alone It can be operated without being influenced by 23, and its workability is extremely good. Note that when removing each cutter body 23 from the adapter 22 in order to replace or re-grind the blade tip 39, remove each cutter body 23 from the adapter 22 by performing the operation in the reverse order as described above. be able to. FIGS. 12 and 13 show other examples of the tightening screw in the side milling cutter 201 having the above structure and the through hole through which it should be inserted. A bag portion 53 having a smaller diameter than the outer diameter of the threaded portion 52 is formed over a predetermined length between the threaded portion 52 and the threaded portion 52 .

On the other hand, through holes 54 formed in each cutter body 23
At the bottom of the bolt seat 55, a threaded portion 56 with a slight length equivalent to the threaded hole 31 formed in the adapter 22 is formed, and a hole with a larger diameter than the screw threaded portion 56 is formed at the bottom of the threaded portion 56. A portion 57 is formed. Then, the cutter body 23 is attached to the adapter 2 using the tightening screw 50.
When fixing by pressing on the outer circumferential surfaces 27, 27 of No. 2, the 12th
Tighten the tightening screw 50 with its threaded portion 52 screwed into the screw hole 301 of the cylindrical portion 24 and its head 51 engaged with the bolt seat 55 of the cutter body unit 23 as shown in the figure. It is done by On the other hand, when removing the cutter body 23 from the adapter 22, use the tightening screw 50.
The threaded portion 52 and the threaded hole 30 can be unscrewed by turning the threaded portion 52, but if the tightening screw 50 is further turned in the direction in which it comes out, the threaded portion of the tightening screw 5 can be removed as shown in Fig. 13. 52 is screwed into a threaded portion 56 formed in the through hole 54. Therefore, when removing the cutter body unit 23 from the adapter 22, the attached screw 50 is attached to the cutter body unit 23.
There is no need to completely remove the cutter body 23 from the adapter 22, and the two can be kept as one body, which prevents the tightening screw 50 from being lost.
The attaching/detaching operation of the cutter body itself is improved, as the attached screw 60 can be used as a gripping part when detaching the cutter body from the cutter body. Furthermore, the convex portion of the cutter body 23 in the present invention is not limited to the shape of the above embodiment, but may be configured as shown in FIG. 14, for example.

That is, the protrusion 35a has its base end aligned with the formation groove 2.
5, and both side surfaces 35b on the proximal side are in close contact with the south wall surfaces 26, 26 of the iron fitting groove 25, and the tip end is formed in the iron fitting groove 25. It is formed to have a width slightly narrower than the width of the groove 25, and both side surfaces 35c, 35c on the tip side are configured to be slightly spaced apart from both side wall surfaces 26, 26 of the competition groove 25 in the engaged state. . As a result, when inserting the convex portion 35a into the iron fitting groove 25, since the convex portion 35a is formed as described above, both side surfaces 35 on the tip side of the convex portion 35a are
35c digs into the inner surface of the groove 25, or both sides of the groove 25 bites into the south side of the protrusion 35a, which is the so-called galling phenomenon. , and the attachment/detachment operation is improved.Furthermore, in each of the above embodiments, an example has been described in which a pair of cutter bodies 23 are used in combination to form an annular body, but the present invention is limited to each of the above embodiments. It goes without saying that the cutter body may be constructed using a plurality of single cutter bodies that combine to form an annular body instead of a single cutter body.

As explained above, the split type reshaping tool according to the present invention includes an adapter that is attached to an arbor or a spindle, and a plurality of cutter bodies that are assembled to the adapter and have an annular shape as a whole. Since the cutter body can be detachably attached to the adapter using cotton screws screwed along the radial direction, it is easy to attach and detach the cutter body to replace the cutting tip, etc. Not only is it possible to safely attach and detach the cutter body because it is lightweight, but since the cotton-tipped screw is screwed into the cutter body in the radial direction, the tightening screw can be easily operated on the arbor, collar, etc. Therefore, its operation can be performed quickly and easily. In addition, if a part of the through hole into which the screw for fixing the cutter body to the adapter is inserted is provided with a threaded portion that engages with the screw, when the cutter body is removed from the adapter. In addition, the screw can be integrated with the cutter body alone, thereby preventing the screw from being lost, and improving the operability of attaching and detaching the cutter body. Furthermore, the convex portion of the cutter body alone has a distal end formed to have a width slightly narrower than the width of the matching groove of the adapter, and a proximal end thereof having a width approximately equal to the width of the matching groove. With this configuration, when the cutter body itself is attached to the adapter, the convex portion can smoothly compete with the iron fitting groove without causing a galling phenomenon, and the attachment/detachment operation can be improved.

[Brief explanation of the drawing]

Fig. 1 is a front view showing an example of a conventional milling tool, Fig. 2 is a partially cut-off side view thereof, and Fig. 3 is a longitudinal sectional side view of the rolling tool shown in Fig. 1 attached to a horizontal milling machine. , 4th
The figure is a longitudinal cross-sectional view of the milling tool according to the present invention attached to an arbor, FIG. 5 is a front view thereof, FIG. 6 is a cross-sectional view taken along the line W- in FIG. 5, and FIG. Fig. 5 is a cross-sectional view taken along the skin line arrow, Fig. 8 is a partially cut-off side view of Fig. 5, Figs. FIG. 5 is a sectional view taken along the phantom-phantom line arrow, FIG. 12 is a sectional view of the main part showing another embodiment of the present invention, FIG. 13 is a sectional view of the main part with the attachment screw loosened, and FIG. The figure is a sectional view showing still another embodiment of the present invention. 22: Adapter, 23: Single cutter body, 24: Cylindrical part, 25: Steel groove, 30: Screw hole, 31 ...Arbor hole, 35
, 35a... Convex portion, 39... Cutting blade tip, 40...
Plate, 41, 45...Screw with cotton. Figure 1 Figure 2 Figure 3 Figure 4 Figure 5 Figure 6 Figure 7 Figure 8 Figure 9 Figure 10 Figure 11 Figure 12 Figure 13 Figure 14

Claims (1)

[Claims] 1. An adapter in which a fitting groove is formed along the circumferential direction on the outer periphery of a cylindrical portion in which a mounting hole is formed along the central axis;
The cutter body is made up of a plurality of individual cutter bodies each having a protrusion that fits into the fitting groove formed on the inner circumference, cutting tips attached to predetermined locations on the outer circumference, and joined to each other to form an annular shape as a whole. Each cutter body is removably attached to the adapter by fitting the convex portion into the fitting groove with a tightening screw screwed along the radial direction and screwed into the adapter. A split type milling tool featuring: 2. The cutter body alone has a screw hole portion into which the tightening screw is screwed, and an opening end side of the screw hole portion opposite to the opening portion on the bolt seat side, which has a larger diameter than the screw hole portion. The split-type milling tool according to claim 1, characterized in that a hole is formed therein. 3 The convex portion of the single cutter body has a distal end formed to have a width slightly narrower than the width of the fitting groove of the adapter, and a proximal end thereof having a width approximately the same as the width of the fitting groove. A split-type milling tool according to claim 1, characterized in that the split-type milling tool is formed by: