JPH0224577Y2 - - Google Patents

Description

[Detailed Description of the Invention] This invention relates to an improvement of a milling cutter device for rough gear cutting of curved bevel gears.

Generally, a Gleason gear cutting type milling cutter device is often used for cutting the tooth grooves of large gears of curved bevel gears. FIG. 1 shows a schematic configuration of this type of milling cutter device, where 1 is the main body of the milling cutter device, and 2 is a processed material for a large gear of a curved bevel gear. This device main body 1 is provided with a disk-shaped mounting base 3. As shown in FIG. 2, this mounting base 3 has a large number of mounting recesses 4 formed in its peripheral portion. As shown in FIG. 3, screw holes 5 are formed in the back walls of each of these mounting recesses 4. In addition, each of these mounting recesses 4... has a bottom cutter blade 6 shown in FIG. 4a, b, c, an inner cutter blade 7 shown in FIG. 5a, b, c, and a cutter blade 7 shown in FIG. An outer cutter blade 8 shown in c is attached to each. Each of these cutter blades, together with the two bottom cutter blades 6, 6, has one
The inner cutter blade 7 and the outer cutter blade 8 form a set of four, and usually one
Six to eight sets of cutter blades are respectively attached to the mounting base 3 of the stand. Further, each cutter blade 6, 7, 8 is provided with a mounting hole 9 having a larger diameter than the screw hole 5 of the mounting base 3. …
A fixing bolt (not shown) inserted therein is screwed into the screw hole 5 of the mounting base 3, and each cutter blade 6,
7 and 8 are fixed to the mounting base 3. During rough cutting of the tooth grooves 10 of the workpiece 2 for curved bevel gears, as the mounting base 3 rotates, the bottom cutter blade 6 cuts the tooth grooves 10 of the workpiece 2 as shown in FIG. While the tooth bottom 11 is cut, one side 12 of the tooth groove 10 is cut by the inner cutter blade 7, and the other side 13 of the tooth groove 10 is cut by the outer cutter blade 8. ing. In addition, after the rough gear cutting operation is completed, a finishing milling cutter is used to cut both sides 14 of the tooth groove 10 of the workpiece 2, as shown in FIG.
15 is cut to form a large gear of a curved bevel gear.

By the way, during the rough gear cutting operation, the tooth groove 1 of the workpiece 2
Since it was difficult for chips to escape from the zero tooth bottom part 11 and it was difficult for lubricating oil to reach the tooth bottom part 11, the bottom cutter blade 6 easily became hot. Therefore,
Since the degree of wear of the bottom cutter blade 6 was greater than that of the inner cutter blade 7 and the outer cutter blade 8, there was a problem that the tool life of the bottom cutter blade 6 was relatively short. In addition, the material of the cutter blades 6, 7, and 8 currently used is high-speed steel (high-speed steel), and the cutting speed when using the cutter blades 6, 7, and 8 made of high-speed steel is approximately 60 m/min. Therefore, in order to shorten the cutting time, it is desired to use a cutter blade made of cemented carbide that can operate at a cutting speed of about 120 m/min. however,
Since the tool life of the bottom cutter blade 6 is relatively short, when the bottom cutter blade 6 made of cemented carbide is used, there is a big problem in terms of cost, and it has been difficult to put it into practical use.

This idea was made based on the above circumstances, and its purpose was to extend the life of the bottom edge cutter blade, reduce tool costs, and in addition, to cut the tooth groove accurately. The purpose of the present invention is to provide a milling cutter device that can be used.

An embodiment of this invention is shown in Figs. 9 to 13 below.
This will be explained with reference to the figures. FIG. 9 shows the main parts of the milling cutter device, in which 21 is a disk-shaped mounting base, and 22 is a bottom cutter blade. This mounting base 21 has a configuration similar to that of the mounting base 3 shown in FIGS. 2 and 3, and has a number of mounting recesses on the periphery to which the bottom, inner, and outer cutter blades are attached. It is provided. In this case, the mounting recess 23 for mounting the bottom cutter blade 22 is provided with a bottom wall 24 that closes the bottom, as shown in FIG. A through hole 25 is formed in the center of the bottom wall portion 24, passing through between the upper and lower surfaces. In addition, the bottom cutter blade 22 is attached to the mounting recess 2 of the mounting base 21.
It is formed by a cutter blade body 26 attached to the cutter blade body 3 and a throw-away blade portion 27 detachably attached to the cutter blade body 26. The cutter blade main body 26 is shown in FIG. 4b.
Similar to the conventional bottom-edge cutter blade shown in FIG. 2, a mounting hole 29 is formed which has a larger diameter than the screw hole 28 formed in the mounting base 21. Further, a holding portion 30 for holding the throw-away blade portion 27 is provided at the end of the cutter blade body 26 on the side protruding from the mounting recess 23. A notch 31 is formed on one side of the holding portion 30, and a mounting hole 32 for the throw-away blade portion 27 is formed between the other side and one side of the notch 31. As shown in FIG. 12, this mounting hole 32 has a tapered inclined surface where the inner diameter is largest on the side of the insertion port of the throw-away blade part 27, and the inner diameter gradually decreases toward the back. has been done. Further, the throw-away blade section 27 is provided with a cutting section 33 and a mounting section 34, respectively, and is made of cemented carbide. The attachment portion 34 is cylindrical and has a tapered inclined surface on its outer circumferential surface, the outer diameter of which is smaller on the tip side than on the cutting portion 33 side. It is adapted to be fitted into the hole 32. Furthermore, the cutting part 33 is attached to the mounting part 34.
As shown in FIG. 13, the outer periphery of this cutting part 33 cuts the tooth bottom part 37 of the tooth groove 36 in the machining material 35 for the large gear of the curved bevel gear. It is designed to be cut.
Further, a screw hole 38 is provided on the lower surface of the cutter blade main body 26 at a position facing the through hole 25 of the bottom wall portion 24 of the mounting recess 23 in the mounting base 21. An adjustment bolt 40 having a polygonal recess 39 formed on its lower surface is screwed into the screw hole 38 . Then, the through hole 25 is opened from below the bottom wall portion 24.
By inserting a tool such as a hexagonal wrench into the recess 39 of the adjustment bolt 40 and rotating the adjustment bolt 40, the screw hole 28 on the mounting base 21 side and the mounting hole 2 on the cutter blade main body 26 side can be connected.
The cutter blade main body 26 can be adjusted to move upwardly and downwardly within the range of the play dimension between the cutter blade 9 and the cutter blade 9.

Therefore, in the case of the structure described above, the bottom cutter blade 22 is formed by the cutter blade main body 26 and the throw-away blade portion 27 detachably attached to the cutter blade main body 26,
Since the throw-away blade part 27 can be replaced as appropriate, the tool life of the bottom cutter blade 22 can be greatly improved compared to the conventional one, and tool costs can also be reduced. Further, the cutting portion 33 of the throw-away blade portion 27 is formed into a conical shape,
Since the bottom part 37 of the tooth groove 36 of the workpiece 35 is cut at the outer peripheral edge, the workpiece 35, which was conventionally cut with the inner and outer cutter blades, can be cut as shown in FIG. Both sides 4 of tooth groove 36
1 and 42 and a portion of the finished surfaces 43 and 44 that have been cut with the finishing cutter blade can be cut with the bottom cutter blade 22. Therefore, the cutting share of the inner cutter, outer cutter, and finishing cutter blade for rough gear cutting can be reduced, and the tool life of the inner cutter, outer cutter, and finishing cutter blade can be improved. can. Furthermore, the tooth groove 36 in the large gear of the curved bevel gear after molding.
Since the radius of curvature R of the tooth bottom portion 37 can be increased compared to the conventional one, the gear strength of the large gear can be increased, and the bottom edge cutter blade 2
By setting the cutting depth h' according to No. 2 to about 0.6 to 0.9 mm, it is possible to attach a top rim to the large gear after molding, and it is possible to prevent interference with the tips of the pinion teeth. In addition, since the bottom cutter blade 22 can be adjusted to move upwardly and downwardly using the adjustment bolt 40, for example, the blades of both the inner and outer cutter blades may be damaged and may need to be re-ground. In the case of use, the height of the bottom cutter blade 22 can be finely adjusted to match the height of both the inner cutter blade and the outer cutter blade after this re-grinding. Therefore, it is possible to prevent excessive machining of machining allowance during cutting after re-grinding, and it is also possible to perform cutting with an accurate tooth groove shape. moreover,
Since the cutting portion 33 of the throw-away blade portion 27 is formed in a conical shape, the throw-away blade portion 27
By rotating the entire tool, the cutting position can be changed multiple times, and the tool life can be further improved.

Note that this invention is not limited to the above embodiments. For example, the throw-away blade portion 27 may be fixed to the cutter blade body 26 by clamping or screwing. In addition, the bottom cutter blade 2 is attached to the mounting base 21 side.
A second adjustment mechanism for height adjustment may be provided. Furthermore, it goes without saying that various other modifications can be made without departing from the gist of the invention.

As explained above, according to this invention, the bottom cutter blade for cutting the bottom of the tooth groove in the processing material for curved bevel gears can be attached to and detached from the cutter blade body which is attached to the mounting base. Since it is formed by the attached throw-away blade part, the life of the bottom cutter blade can be extended, and the tool cost can be reduced. Furthermore, the cutter blade body is installed in a mounting recess formed in the mounting base, and the cutter blade body is adjusted to move in and out of the mounting base by rotating between the bottom wall of the mounting recess and the lower surface of the cutter blade body. Since the adjusting means consisting of a bolt is provided, accurate cutting of the tooth groove shape can be performed.

[Brief explanation of the drawing]

Figures 1 to 8 show conventional examples.
The figure is a schematic diagram of the overall configuration, Figure 2 is a plan view showing the mounting base, Figure 3 is a sectional view taken along the - line in Figure 2, Figure 4 a is a front view showing the bottom cutter blade, and Figure b is a front view showing the bottom cutter blade. The same side view, FIG. 5 c is the same plan view, FIG. 5 a is the front view showing the inner cutter blade, FIG.
Figure c is a plan view of the same, Figure 6a is a front view showing the outer cutter blade, Figure b is a side view of the same, Figure c is a plan view of the same, and Figure 7 is a side view showing the tooth grooves of the processed material. figure,
Figure 8 is an enlarged side view of a part of Figure 7, Figures 9 to 13 show an embodiment of this invention, and Figure 9 shows the main part showing the installation state of the bottom cutter blade. A longitudinal sectional view, Fig. 10 is a front view of the bottom cutter blade, Fig. 11 is a side view of the same, Fig. 12 is a sectional view taken along the line XII-XII of Fig. 11, and Fig. 13 is a tooth groove of the processed material. FIG. 3 is an enlarged side view of the bottom. 21...Mounting stand, 22...Bottom cutter blade, 2
3...Mounting recess, 26...Cut blade main body, 27
...Throwaway blade part, 35...Machining material, 36...
Tooth groove, 40...adjustment bolt.

Claims (1)

[Scope of utility model registration request] An inner cutter blade and an outer cutter blade are arranged in parallel with a bottom cutter blade along with a bottom cutter blade on the peripheral edge of a disc-shaped mounting base, and as the mounting base rotates, teeth are formed on the processed material for the curved bevel gear. In a milling cutter device that cuts the bottom of a groove with the bottom cutter blade and both sides of the tooth groove with the inner cutter and outer cutter blades, only the bottom cutter blade is mounted on the mounting base. The cutter blade body is formed by a cutter blade body to be attached and a throw-away blade part detachably attached to the cutter blade body, and the cutter blade body is attached in a mounting recess formed in the mounting base, and the cutter blade body is mounted in a mounting recess formed in the mounting base, and A milling cutter device, characterized in that an adjusting means is provided between a wall portion and a lower surface of the cutter blade body, the adjustment means being an adjustment bolt that is rotatably operated to move the cutter blade body into and out of the mounting base.