JPS6138810A - Milti-edged milling cutter - Google Patents

Abstract

PURPOSE:To enable a cutter to perform its cutting work as high accurately as the polishing work further enhance cutting work efficiency, by continuously arrangeing in the peripheral part of a disc-shaped cutter body a multiple number of tips so as to be brought inyo contact with each other and providing multiple edges on the cutter. CONSTITUTION:A cutter body 10 forms on its peripheral part a peripherally rounding circumferential groove 18. This circumferential groove 18 arranges many tips 20 of almost rectangular parallelepiped-shape, and ths tip, in which front and rear surface parts are brought into contact with each other and positioned so as to be overlapped in the circumferential direction, is fixed by a ring member 23 and a bolt. A cutter enables its cutting work to be performed in high accuracy as a wheel, because a number of mounting tips can be increased as many as possible, while improves cutting work efficiency.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a multi-blade milling cutter, and more particularly, the present invention relates to a multi-blade milling cutter, and more specifically, a multi-blade milling cutter having a plurality of chips disposed on the outer periphery of a disc-shaped cutter body so as to be in contact with each other without interruption. This invention relates to a multi-blade milling cutter configured to have multiple blades.

2. Description of the Related Art Many milling machines, ie, milling machines, are used that rotate a circular cutter fitted on a shaft, feed the workpiece at a predetermined speed, and cut the workpiece with the cutter.

In the prior art, the milling cutters that achieve the cutting function of this milling machine include those in which the milling cutter body and the blade part are integrally formed, and the so-called milling cutter in which the blade part is detachably attached to the milling cutter body. There is one in which the main body and the blade are separated. Therefore, the former has the disadvantage that if a large number of workpieces are to be cut, the cutting edge will wear out, and even if only the cutting edge needs to be replaced, the entire milling cutter must be replaced. Also,
If the type of workpiece is different, it goes without saying that the milling cutter itself must be replaced depending on the type of workpiece, and for this purpose, there is the inconvenience of having to prepare many types of milling cutters depending on the type of workpiece. be.

On the other hand, related to the latter, in recent years U.S. Patent No. 3.7OL1
As disclosed in No. 87, a chip knob corresponding to the blade is detachably attached to the cutting edge of a milling cutter, and even if the chi knob becomes worn out, only the tip part can be replaced. is proposed.

However, with the structure adopted by this method, there is a limit to the number of chi knobs that can be fixed to one milling cutter, and there are disadvantages in that the installation space must be extremely large. In particular, when trying to perform precise and smooth cutting on a workpiece, that is, cutting as close to a grindstone as possible, and therefore close to polishing, this type of method can only perform rough cutting, which is inconvenient. It had been pointed out.

Therefore, as a result of various studies and efforts, the inventors of the present invention have found that the number of tips can be increased infinitely by attaching a large number of tips to the grooves carved on the outer periphery of the cutter body so that they are in continuous contact with each other. With this multi-blade milling machine, it is possible to get as close to the grinding wheel as possible, making it possible to perform precise cutting, and further increasing production efficiency. It has been found that the above-mentioned disadvantages can be eliminated.

Therefore, an object of the present invention is to connect as many tips as possible to each other to obtain a multi-edged structure, thereby ensuring a highly accurate cutting process and easily eliminating the need for cutting edges even when some of the tips break or wear out. To provide a multi-blade milling cutter whose parts are replaceable.

In order to achieve the above object, the present invention forms a circumferential groove around the outer circumference of a disc-shaped cutter body constituting a milling machine, and arranges a plurality of chips in contact with each other in the circumferential groove. It is characterized by having

Next, preferred embodiments of the multi-blade milling cutter according to the present invention will be described in detail with reference to the accompanying drawings.

In FIGS. 1 and 2, reference numeral 10 indicates a cutter body, and a large diameter hole 12 is formed in the central portion of the cutter body 10. As shown in FIG. As will be described later, an end of a rotating shaft extending from the milling machine body fits into the hole 12 . By forming the hole 12 in this way, the main body portion of the cutter body 10 configured in a ring shape has holes 14a to 14f for inserting bolts spaced apart by a predetermined distance.
is drilled. Further, a circumferential groove 18 is formed in the outer peripheral portion of the cutter body 10. In this case, a plurality of screw holes 25 are formed at predetermined intervals in the stepped portion 19 obtained by defining the circumferential groove 18 (see FIGS. 3 and 4).

Therefore, in the above configuration, a large number of substantially rectangular parallelepiped chips 20 are arranged in the circumferential groove 18. In this embodiment, as can be easily understood from FIG.
are continuously arranged along the outer peripheral edge of the cutter body 10. That is, as shown in FIGS. 3 and 4, the tip 20 is rotated in the cutting rotation direction (arrow A in FIG. 3).
The front surface portion 21a and the rear surface portion 21b are brought into contact with each other in the circumferential direction, and positioned so as to overlap each other. In this case, the chip 20 has a substantially rectangular parallelepiped shape, as shown in FIGS. 5 and 6, and has surface portions 20a and 20b that are inclined to each other at its upper end. These surface portions 20a and 20b are the front portion 21. which constitutes the chip 20.
A and ik surface portions 21b constitute a corner portion, and in particular, the ridgeline portion 20C120d formed by the front surface portion 21a and the surface portions 2Qa and 20b is subjected to suitable cutting. On the other hand, the outer surface portion 2IC of the tip 20 is formed of an inclined surface having a predetermined angle θ1 in the axial direction of the cutter body 10, and the front surface portion 21a and rear surface portion 21b thereof are formed with a predetermined angle θ1 in the radial direction of the cutter body 10. It is formed by an inclined surface having an angle θ2) θ3. That is,
When these chips 20 are disposed closely radially around the outer circumference of the cutter body 10, the chips 20 themselves are brought into contact with adjacent chips over the entire surfaces of the front surface 21a and rear surface 21b. It is.

In this case, as shown in FIG. 7, only the front portion 21a may be formed with an inclined surface having a predetermined angle θ4. With the lid closed, the tilt angle θ2 of the chip 20 shown in FIG.
If +θ3 is equal to the tilt angle θ4 of this chip 20, then
This is because there is no problem with the radial arrangement of the chips 20, and there is also the advantage that the chips can be easily processed.

Next, in this embodiment, a ring member 23 is used to fix the chip 20. This ring member 23 is connected to the outer peripheral end surface of the cutter body 10 with bolts 22, and the inner peripheral surface thereof has an inclined surface 23a (angle θ5 in FIG. 4) corresponding to the outer surface portion 21C of the tip 20. (see). Furthermore, this ring member 2
A plurality of elongated holes 24 for bolt insertion are formed in the lower part of the cuckoo body 10 in the circumferential direction so as to correspond to the screw holes 25 of the cuckoo body 10. Therefore, after the tip 20 is disposed in the circumferential groove 18 as described above, the ring member 23 is fitted onto the outer circumference of the cutter body 10 from above in the figure, and the bolt 22
If the tip 20 is not soft, the tip 20 is placed in the circumferential groove 18 with its outer surface portion 21C and the ring member 2 that is in pressure contact with the outer surface portion 21C.
The cuckoo body 10 is formed by imitation with the inclined surface 23a of 3.
The tightening will be fixed.

Note that the cutter body 10 configured as described above is
As shown in FIG. 8, it is fixed to a flange 40 formed at the tip of the spindle 38 integrally with a number of chips 20 fixed to its outer circumference. That is, bolts 36 are inserted into the holes 14a to 14f, and the tips of the bolts 36 are screwed into the screw holes 42 of the flange 40. Substantially, a hole is formed in the head portion of the bolt 36, and by fitting a wrench into the hole and screwing the bolt 36.
is screwed in. As a result, the cutter body 10 is moved forward.

flange 40.

The multi-blade milling cutter according to the present invention is constructed as described above, and its functions and effects will be explained next.

First, when the spindle 38 is rotated at a high speed by a rotational drive source (not shown), the flange 40 integral with the spindle 38 also rotates, and the cutter body 10 fixed to the flange 40 via the bolt 36 also rotates. Thereafter, when a workpiece (not shown) is fed to the cutter body 10, a large number of chi knobs 20 attached to the cutter body 10 start cutting the workpiece.

That is, the ridgeline portion 20 of the chi knob 20 is arranged so as to substantially surround the cutter body 10.
c, 20d contacts the workpiece and performs cutting. On the other hand, as a result, the generated cutting waste is suitably led out to the outside via the inclined surface portions 20a and 20b.

By the way, as mentioned above, in the present invention, the tip 20 is attached to the cutter body 10 at its front part 21, 1 and rear part 21.
A large number of chips b are attached radially in contact with each other, and the chip 2
0 installation pinch is shortened to the maximum. That is, the number of chips 20 attached is increased as much as possible. As a result, when these chips 20 rotating at a high speed are subjected to a cutting process, continuous cutting can be achieved as much as possible, and the precision of the finished surface can be further improved by performing an action similar to the so-called polishing of a grindstone. It becomes possible. Incidentally, since the load per blade is reduced by increasing the number of blades, the durability of each tip 20 can be relatively increased. On the other hand, in the event that some of the tips break or are worn out as a whole, the tips 20 can be replaced extremely easily according to the present invention. That is, from the ring member 23 to the bolt 22
By loosening the ring member 23, the ring member 23 can be easily removed from the cutter body 10. As a result, the chip 20 can be unfastened and ready for replacement.

As explained above, according to the present invention, a large number of tips are disposed in contact with each other on the outer circumference of the cutter body, so the number of tips attached can be increased as much as possible. Therefore, a highly accurate cutting process similar to the polishing action of a grindstone is ensured, and the durability of the chip is further improved. Moreover, the multi-blade design increases cutting efficiency, which has the advantage of shortening the time required for the process.

Although the present invention has been described above with reference to preferred embodiments, the present invention is not limited to the above embodiments, and various improvements and design changes can be made without departing from the gist of the present invention. Of course.

[Brief explanation of the drawing]

Fig. 1 is a plan view showing a cutter body of a multi-blade milling cutter according to the present invention, Fig. 2 is a sectional view taken along the line ■-■ of the cutter body shown in Fig. 1, and Fig. 3 is a plan view showing the cutter body shown in Fig. 2. Fig. 4 is an enlarged front view of the main parts of the cutter body, Fig. 4 is an enlarged sectional view of the main parts of the cutter body, Fig. 5 is an enlarged perspective view of the tip, Fig. 6
7 and 7 are cross-sectional views of tips having different shapes, respectively, and FIG. 8 is a cross-sectional view showing how the cuckoo body is assembled to the spindle. 10... Cutter body 12... Hole 14a-14f... Hole 18... Circumferential groove 19... Step part 20... Tip 22... Bolt 23... Ring member 2
4...Long hole 25...Screw hole 36...Bolt 3
8...Spindle 40...Flange 42...Screw hole Patent applicant Honda Motor Co., Ltd.) JP-A-6L-38810 (5) 1 to old O'3 to \ one layer ■ lc. X 1ゝ1 ♀1) ■〕 9 1 1 ': f) + 1 - ・ 1) 1 - l 1) 1 1 II 1 1) + 1 1) ゛1 Onien---Komi 1 1\ -to (Y'1)'s

Claims (3)

[Claims] (1) A multi-blade milling machine characterized by forming a circumferential groove around the outer periphery of a disc-shaped cutter body constituting the milling machine, and disposing a plurality of chips in contact with each other in the circumferential groove. milling cutter. (2) In the milling cutter according to claim 1, the tip has a substantially rectangular parallelepiped shape, and the tip has a first surface portion corresponding to the rotational cutting direction and a second surface portion opposite to the first surface portion. and at least the first surface portion.
A multi-blade milling cutter, in which either one of the surface portion and the second surface portion is formed by a surface oriented in the radial direction of the cutter body and inclined at a predetermined angle. (3) A multi-blade milling cutter according to claim 1 or 2, wherein the tip has at its outer end an inclined surface displaced with respect to the axial direction of the cutter body.