JPS5927286B2 - Split type milling tool - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a milling tool for face slicing, side slicing, etc.

Conventionally, a milling tool configured as shown in FIG. 1 is known as an example of a milling tool. The cutter body 1 is attached through a wedge 3, and an arbor hole 4 is formed in the center of the cutter body 1 along the central axis, and the cutter body 1 is attached to an appropriate machine tool through the arbor hole 4. It is configured to

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 hole 4 attached to the spindle 5 as shown in FIG. Perform positioning with step 8.

Generally speaking, milling tools are relatively frequently attached to and removed from machine tools, such as to replace the cutting tip 2, to re-sharpen, or to replace with other milling tools. When removing a conventional milling tool configured as shown in Figs. 1 and 2 from a horizontal milling machine, first remove the arm support 9 from the overarm 10, and then remove the arm μ nut 11. It was necessary to remove it from the ARμ 6, and also remove the ARμ bearing 12 and collar 8.

For this reason, with conventional milling tools, it takes time to attach and detach the tools, which leads to the inconvenience of lowering the operating rate of the machine.Furthermore, the cutter body 1 is integrally formed. It has the drawback of poor workability and safety due to its heavy weight.

The present invention has been made in view of the above circumstances, and aims to provide a milling tool that can be quickly, safely, and more accurately attached to and detached from a machine tool, and is characterized by: A cutter body that can be divided into a plurality of individual cutter bodies is fitted onto the outer periphery of a fitting protrusion protruding from the center of the front face of the adapter, and the cutter body is detachably attached to the adapter. That's the point.

Embodiments of the present invention will be described below with reference to the drawings.

The milling tool 20 shown in FIG. 3 includes an adapter 21, a pair of cutter bodies 22 constituting a ring-shaped cutter body, and a cutter body 22 for pressing and fixing the cutter bodies 22 toward each other. 1 fixing means, a fastening means for coupling the cutter bodies 22 to each other, and a second fixing means for fixing the cutter bodies 22 to the adapter 21, and each of them will be explained in turn below. .

First, the adapter 21 has a substantially disk shape as shown in FIGS. 4 and 5, and has a cylindrical fitting portion (fitting convex portion) 2 on the front side.
3, and a flange portion 24 having a larger diameter than the cylindrical fitting portion 23. The outer circumferential surface 23a of the cylindrical fitting portion 23 regulates the position of the cutter body 21 in the radial direction, and the flange portion 24 has a diameter larger than that of the cylindrical fitting portion 23. The front wall surface 24a of the portion 24 is configured to regulate the position in the axial direction.

Further, screw holes 25 are formed in the flange portion 24 at two locations symmetrical about the central axis and inclined toward the center.

Furthermore, grooves 26 extending from the inner periphery of the flange portion 24 to the outer periphery of the cylindrical fitting portion 23 are formed along the radial direction at two locations rotated by 90 degrees from each screw hole 25. The width becomes somewhat narrow at the cylindrical fitting part 23, and a locking part 26a is formed there.

Furthermore, the intermediate position between each screw hole 25 and the groove 267 is 4.
A rectangular gap 27 is formed in the white part of the portion, and the gap 27 opens to the front wall surface 24a of the flange portion 24 via a long hole 27a having a smaller area.

An arbor hole 28 is formed along the axis in the center of the adapter 21, and boss surfaces 29 that are precisely ground are formed around the front and rear opening ends of the arbor hole 28.

Next, as shown in FIG. 6, the cutter body single body 22 is a semi-annular body whose inner peripheral side forms an arcuate surface having the same radius as the outer peripheral surface of the cylindrical fitting part 23, that is, the pair of cutter body single bodies 22 are joined to each other to form a complete ring, and a plurality of cutting blade tips 30 are fixed to the outer periphery of the ring with wedges 31 at predetermined intervals.

Both ends of the cutter body 22 are connected to the locking portions 2.
6a, a bolt seat 32 is formed on the front side of both ends by a notch in an approximately figure 5 shape, and a slanted floor 33 is formed by a notch in a figure 7 shape at the rear side of both ends. has been done.

Further, a through hole 34 is formed in the center of the cutter body 22, that is, in a position corresponding to the screw hole 25 when the cutter body 22 is attached to the adapter 21.

Further, an elongated hole 35 larger than the elongated hole 27a is formed at an intermediate portion between the through hole 34 and each end, that is, at each location corresponding to the elongated hole 27a when attached to the adapter 21. The half is on the rear side and has almost the same size as the elongated hole 27a, so that the bolt seat 3 is inserted here.
6 is formed.

Further, a first fixing means for pressing and fixing the cutter body unit 22 in the radial direction is inserted into the through hole 34 and screwed into the screw hole 25, as shown in FIGS. 3 and 7. consisting of a bolt 37, whose head 3
8 is formed with a tapered surface 32a that becomes parallel to the inner surface of the through hole 34 when screwed into the screw hole 25, and by screwing the port T-37 into the tapered surface 38a. contacts the inner surface of the through hole 34 and presses the cutter body 22 in its radial direction.

Further, as shown in FIGS. 3 and 8 to 10, the fastening means for coupling the pair of cutter bodies 22 to each other is such that the respective ends of the cutter bodies 22 are opposed to each other or close to each other. The bolt 39 is inserted into a long hole formed by the groove 26 formed in the adapter 21, and a fastening piece 40 is screwed into the bolt 39.

That is, the bolt 39 can move along the elongated hole, and the lower end of the head 39a is connected to the locking part 26a and the bolt seat 3.
2.

Further, the fastening piece 40 has an inclined surface 40a corresponding to the inclined floor 33 on the surface opposite to the rear surface of the cutter body single body 22.
is formed and is adapted to move within the groove 26 together with the bolt 39.

Furthermore, the second fixing means for fixing the cutter body unit 22 to the adapter 21 in the axial direction is shown in FIG.
As shown in FIGS. 11 and 12, a bolt 41 is inserted into a long hole 35 formed in the cutter body unit 22 and a long hole 27a formed in the adapter 21, and a fixing piece 42 is screwed into the bolt 41. It consists of

That is, the bolt 41 is movable along each elongated hole 35.27a, and the lower end of its head 41a engages with a bolt seat 36 formed in the elongated hole 35, and the fixing piece 42 is located within the gap 2T of the adapter 21 and can move therein, and because the opening area of the elongated hole 27a is small, it is adapted to engage with the inner peripheral portion of the elongated hole 27a.

Next, a procedure for assembling the pair of cutter bodies 22 to the adapter 21 will be described.

First, the bolt 37, which is the first fixing means, is loosened so that its head 38 is raised to the front side of the adapter 21, and the bolt 39, which constitutes the fastening means, is loosened and fastened as shown in FIG. The fixing piece 40 is positioned toward the center of the adapter 21, and the bolt 41 constituting the second fixing means is loosened, and the fixing piece 42 and the elongated hole 3 are loosened as shown in FIG.
5 on the opposite side of the bolt seat 36.

With each bolt 37, 39, 41 set like this, 1
The paired cutter bodies 22 are attached to the outer periphery of the cylindrical fitting portion 23 of the adapter 21 by inserting the head 38 of the bolt 37 into the through hole 34 thereof.

When the bolt 37 is screwed in, the tapered surface 38a of the head 38 comes into contact with the inner surface of the through hole 34, and the cutter body 22 is pressed against the outer peripheral surface 23a of the cylindrical fitting part 23 and fixed.

By doing so, the ends of each cutter body 22 come close to facing each other, and the grooves 2 formed in the adapter 21 are formed here.
6, a long hole is formed.

Therefore, the bolt 39 and the fastening piece 40 constituting the fastening means
When the head 39a of the bolt 39 is moved toward the cutter body 22 side along this long hole (moved from the state shown in FIG. 10 to the state shown in FIG. 9), the lower end of the head 39a of the bolt 39 is Each bolt seat 3 formed at the end of 22
At the same time, the inclined surface 40a of the fastening piece 40 engages with each inclined floor 3 formed on the rear surface of the end of each cutter body single body 22.
3.

However, when the bolt 39 is tightened at this point, the inclined surface 40
Due to the cooperative action of the cutter bodies 22 and the inclined floor 33, the cutter bodies 22 are firmly connected to each other.

Furthermore, a bolt 41 and a fixing piece 42, which are second fixing means.
When the bolt 4 is moved within the long hole 35 and the cavity 27 from the state shown in FIG. 12 to the state shown in FIG.
The lower end of the head 41a of the bolt seat 36 is engaged with the bolt seat 36, and at the same time, the fixing piece 42 is engaged with the peripheral part of the elongated hole 27a on the cavity 27 side.

However, when bolt 41 is tightened here, bolt 4
1 is engaged with the cutter body unit 22 and the fixing piece 42 is engaged with the adapter 21, so that the cutter body unit 22 is positionally regulated by the front wall surface 24a of the flange portion 24 of the adapter 21 and tightly fixed there. be done.

By completely tightening each bolt 37, 39, 41, each cutter body 22 is positioned and fixed to the adapter 21, thereby forming the milling tool 20.

In addition, when removing each cutter body unit 22 from the adapter 21, the operation described above may be reversed.

FIG. 13 shows the state in which the milling tool 20 configured as described above is attached to the ar-μ43 of a horizontal slicing machine. , and further held and positioned by a plurality of collars 45.

When a milling tool is installed in this way, with conventional milling tools, it is necessary to remove all the fixing members such as collars as described above, and then remove the milling tool. In the milling tool 20 having the following configuration, the cutter body 22 can be removed from the adapter 21 by loosening each bolt 37.
By performing the reverse operation, each cutter body 22 can be attached to the adapter 21. Therefore, the adapter 21 can remain attached to the arm μ43. The operation of attaching and detaching the body unit 22 can be performed extremely easily and quickly, and furthermore, due to its light weight, it can be performed extremely safely.

FIG. 14 shows the milling tool 20 with the above configuration attached to the machine spindle 4.
The centering plug 47 is fitted to the tip of the machine spindle 46, and the adapter 21 fits its arbor hole 28 into the tip of the centering plug 47. They are aligned and prevented from rotating with the key 48, and the machine spindle 4
It is fixed with a fixing bolt 49 that is screwed into 6.

Even when installed in this way, in order to remove each cutter body 22 from the adapter 21, remove each bolt 37.
, 39 and 41, and each cutter body 22 can be easily and quickly and safely attached to and detached from the adapter 21 in the same manner as when attached to the arm μ 43 of the horizontal slicing machine described above.

In the above embodiment, the cutter body is constituted by a pair of single cutter bodies 22, and is a so-called 2-split type cutter body. However, the present invention is not limited to the above embodiment, and can be made of a plurality of cutter bodies such as a 3-split type, a 4-split type, etc. Any cutter body can be used as long as it can be divided into two parts, and the present invention can be applied not only to face slicing but also to various milling tools such as side milling cutters.

As explained above, according to the split-type milling tool of the present invention, a cutter body that can be divided into a plurality of individual cutter bodies is provided on the outer periphery of the fitting protrusion protruding from the center of the front surface of the adapter. Since the cutter body is configured to be removably attached to the adapter by mating, for example, when attaching to and detaching from a horizontal milling machine, the adapter can be fixed to the machine without removing the arbor support, arbor nut, collar, etc. The cutter body can be installed and removed, so if the cutting tip needs to be replaced, it can be done easily and quickly, which reduces machine downtime.
Machine operation rate can be significantly improved.

Furthermore, since the cutter body is attached and detached rather than the entire milling tool, its weight is light, and therefore the attachment and detachment work can be carried out safely.

In addition, if the means for fixing the cutter body is constituted by a bolt that engages and fixes the cutter body in a tightened state, and becomes unattached to the cutter body or adapter in a relaxed state, The cutter body can be removed from the adapter by simply loosening the bolts without having to remove them, thereby making the operation easier and faster.

[Brief explanation of drawings]

Fig. 1 is a front view of a conventional milling tool, Fig. 2 is a longitudinal side view of the conventional milling tool attached to a horizontal milling machine, and Fig. 3 is a partially broken front view of an embodiment of the present invention. Fig. 4 is a front view of the adapter, Fig. 5 is a sectional view taken along the line v-v in Fig. 4, Fig. 6 is a front view of the cutter body alone, Fig. 1 is a front view of Fig. 3, Cross-sectional view along the line, Figure 8 is from ■-■ in Figure 3.
Figure 9 is a cross-sectional view taken along the line ■-■ in Figure 3;
Fig. 10 is a sectional view similar to Fig. 9, showing the fastening means in a relaxed state, Fig. 11 is a sectional view taken along the line XI-XI in Fig. 3, and Fig. 12 is a relaxed state of the second fixing means. FIG. 13 is a longitudinal sectional side view of the machine mounted on a horizontal milling machine, and FIG. 14 is a longitudinal sectional side view of the machine mounted directly on a machine spindle. 20...Turning tool, 21...Adapter, 22...Cutter body alone, 23...
・Cylindrical fitting part (fitting convex part), 30... Cutting blade tip.

Claims (1)

[Claims] 1. Has a fitting convex portion protruding in the axial direction at the center of the front surface,
an adapter attached to the spindle of a predetermined machine tool;
The whole has a ring shape, and a plurality of cutting tips are attached to the outer circumference, and a cutter body whose inner circumference is fitted to the outer circumference of the fitting convex part, and the cutter body extends in the radial direction. A split type milling tool, characterized in that it is divided into at least two parts and each of the divided cutter bodies is configured to be detachably attached to the adapter.