JPS5921722B2 - Staggered blade turning tool - Google Patents

Description

[Detailed description of the invention] The present invention relates to improvements in staggered rotary cutting tools.

As an example of a conventional staggered rotary cutting tool, one constructed as shown in FIGS. 1 to 3 is known.

That is, on the outer peripheral surface of the disc-shaped tool body 1, a plurality of chip mounting grooves 2 are formed at intervals of Q in the circumferential direction and in mutually opposite directions (
It is formed to be inclined.

In these chip mounting grooves 2, cutting blade chips 3 are placed with reference to a supporter 5 which is secured and positioned by a wedge 4, and are secured by being secured by another wedge 6.

Note that the cutting blade tips 3 are arranged in a staggered manner on the outer peripheral surface of the tool body 1, and the cutting blade tips 3 on the same side (each existing cutting blade tip 3
are all installed in the same manner.

Further, the wedges 4 and 6 are attached to the tool body 1 by screws 7 and 8.

In the staggered rotary cutting tool configured in this way, the cutting edge tip 3 has an inclination angle corresponding to the helix angle, corresponding to the inclination angle given to the tip mounting groove 2, so that cutting can be easily performed. The blade tip 3 gradually bites into the workpiece.

Therefore, no shocking cutting load occurs,
Breakage of the cutting edge tip 3 can be prevented.

Moreover, although the cutting blade tip 3 is tilted, a thrust load acting in the axial direction of the main body 1 is generated, but since the cutting blade tips 3, 3 adjacent to each other in the circumferential direction are tilted in opposite directions, The thrust loads acting on each cutting edge tip 3, 3 cancel each other out.

Therefore, there are advantages such as being able to prevent meandering and chatter vibration of the tool due to thrust loads.

In this way, by alternately inclining the insert mounting grooves 2 in opposite directions and by alternately inclining the cutting blade tips 3 in opposite directions, the above advantages can be obtained, but on the other hand, in the conventional staggered rotary cutting tool, the following There was a problem like this.

In other words, since the circumferentially adjacent chip mounting grooves 2, 2 are inclined in opposite directions to each other, the width of the part (back metal) between the two chip mounting grooves 2, 2 is the same at one end of the tool body 1. It is wide and narrows at the other end.

In this case, it is necessary to determine the dimensions of the other end, which has the narrowest width, so that it can sufficiently withstand the cutting load.

As a result, the width of the back metal becomes wider than necessary on one end side.

Therefore, there is a problem in that the number of cutting tips 3 that can be attached to the tool body 1 is reduced, resulting in a reduction in machining efficiency.

This invention was made to solve the above problem.
Not only does it offer the same benefits as conventional staggered blade milling tools, but it also allows you to increase the number of cutting chips that can be attached to the tool body, thereby improving machining efficiency. The purpose is to provide staggered cutting tools.

Hereinafter, one embodiment of the present invention will be explained with reference to FIGS. 4 to 10.
This will be explained with reference to the figures.

In the figure, 10 is a tool body, which consists of a main body 11 and a sub-body 12.

The main body 11 has an annular groove 16 formed in the outer periphery of one side of a disk-shaped body 15 having an arbor hole 13 and boss surfaces 14 a t 14 b on both sides, respectively. A plurality of chip mounting grooves 11 are formed on the outer circumferential surface of the disk-shaped body 15 at the same circumferential spacing O and inclined in the same direction ζ, and the portion of the disk-shaped body 15 where the grooves 16 exist. A plurality of screw holes 18 are formed at intervals on the same circumference, and furthermore, through holes 19 for positioning are formed at predetermined locations on the disc-shaped body 15.

The sub body 12 has the main body 1 in the center of a disk-shaped body 20 whose outer diameter is the same as the outer diameter of the disk-shaped body 15 of the main body 11.
A fitting hole 21 is formed that is slightly larger than the inner peripheral wall surface of the groove 16 of No. 1, and a plurality of chip mounting grooves 22 are formed on the outer peripheral surface of the disc-shaped body 20 at intervals in the circumferential direction and in the same direction. Screw mounting holes 24 are formed to be inclined in the opposite direction to the Nisso groove 11 and have stepped portions 23 at locations corresponding to the screw holes 18 of the main body 11 of the disc-shaped body 20. In addition, a positioning through hole 25 is formed in a position corresponding to the through hole 19 of the main body 11 of the disc-shaped body 20.

The main body 11 and the sub body 12 are connected to the through hole 1.
The dowel pins 26 inserted from the through holes 9 to the through holes 25 and fixed are positioned in the circumferential direction G relative to each other, while the screw holes 18 ? Tightening is fixed by a screw 27 inserted here.

In this fixed state, the chip mounting grooves 22 of the sub-body 12 are located between the chip mounting grooves 1γ of the main body 11.

Further, the chip mounting groove 17 has a cutting blade chip 31a.

31b are arranged alternately and are each fixed by a tightening bolt 33 via a wedge 32.

In this case, as shown in FIG. 9, the cutting tip 31a slightly protrudes toward the outer periphery with respect to the cutting tip 31b, and the cutting tip 31b slightly protrudes laterally relative to the cutting tip 31a. It is located.

Further, a cutting blade tip 3ic'y31d is arranged and fixed in the tip attaching groove 22 in the same manner as described above (see FIG. 10).

In addition, ζ to attach the cutting blade tips 31a to 31d is
It is best to do it as follows.

That is, first, as shown in FIG.
Prepare.

Then, the tool body 10 is placed on the surface plate (or flat surface) 30 via one boss surface 14a of the main body 11, and then the other boss surface 14a of the main body 11 of the tool body 10 is placed on the surface plate (or plane) 30.
A dedicated jig 29 is placed on top b and fixed by some means O (for example, by bolts T), and then the cutting blade tip 31a is inserted into the tip mounting groove 17 of the main body 11 and the groove 17 is fixed. position by bringing it into contact with the inner surface 17a of the main body 17a and the reference surface 28 of the special jig 29, then screw the screw 33 passed through the wedge 32 into the main body 11, and tighten the cutting edge tip 31a with the wedge 32c to attach the tip. It is installed in the groove 17 with a relatively small protrusion from the side of the main body 11.

Thereafter, in the same manner as described above, the cutting blade tips 31a are attached one by one in the tip attachment groove 11 of the main body 11 so as to protrude relatively little to the side of the main body 11.

Next, the dedicated jig 29 is removed, and as shown in FIG. It is placed on the other boss surface 14b and fixed, and then the cutting blade tip 31b is inserted into one of the remaining tip mounting grooves 11 of the main body 11.
The wedge 3
2 is screwed into the main body 11 (the cutting blade tip 31b is tightened with the wedge 32 and installed so that it protrudes relatively largely to the side of the main body 11 within the tip attachment groove 1γ).

Thereafter, in the same manner as described above, the cutting blade tip 31b is mounted in the remaining tip attachment groove 17 of the main body 11 so that it protrudes relatively largely to the side of the main body 11.

Next, the dedicated jig 35 is removed, the tool body 10 is placed on the surface plate 30 via the other boss m14b of the main body 11, and then one boss of the main body 11 of the tool body 10 is placed on the surface plate 30. Place and fix the jig 29 for the upper number plate on the surface 14a, and then insert the chip mounting groove 2 of the sub-body 12 in the same manner as above.
2, one Q-cutting blade tip 31c is attached to the side of the sub body 12 so as to protrude relatively small, and then the special jig 2 is installed.
9 is removed and another special jig 35 is attached, and then in the same manner as above, the cutting blade tip 31d is made to protrude relatively largely to the side of the sub body 12 into the remaining tip mounting groove 22 of the sub body 12. equipment.

As a result, the cutting tip 3 is provided on the outer peripheral surface of the tool body 1'0.
1a to 31d are mounted in a staggered manner as shown in FIG. 5, FIG. 9, and FIG. 10 (with steps shown in FIG. 6).

When cutting is performed using a staggered rotary cutting tool configured as described above, the cutting blade tips 31a to 31d are twisted (corresponding to the inclined tip mounting grooves 11 and 22). Since the cutting surface has an inclination of 100 mm, it is possible to prevent an impactful cutting load from occurring.

Moreover, since the tip mounting grooves 17 and 22 are arranged in a staggered manner and are inclined in opposite directions, the thrust load acting on the cutting blade tips 31at 31b and the thrust load acting on the cutting blade tips 31c and 31d are offset. can do.

Also, since all the chip mounting grooves 17 are inclined in the same direction, the portion between the two chip mounting grooves 17°17 (
The width of the back metal is equal between one end and the other end of the main body 11.

Therefore, the width of the back metal on either end side of the main body 11 does not become excessively wide, and the width of the back metal on either end side of the main body 11 does not become excessively wide, and the tip mounting groove 1γ and eventually the cutting edge tip 31at31
The number of b can be increased.

Similarly, the number of cutting tips 31ct31d can be increased.

As a result, processing efficiency can be improved.

Note that the above effect can also be obtained by forming the entire tool body in one piece and forming chip attachment grooves alternately at one end and the other end of the tool body.

However, when the tool body is formed in one piece, not only is it necessary to cut the tip mounting groove at the center of the tool body in the width direction, but also the cut-up portion is the same as the other two tip mounting grooves. In order to avoid interference with the back metal part between the two, it is necessary to widen the width of the tool body, which poses a problem of increasing the size of the entire tool.

In this regard, in the staggered rotary cutting tool of the present invention, since the tool body 10 is composed of the main body 11 and the sub-body 12, the tip mounting groove 17 (22) is connected to the main body 11 (the sub-body 1
2) There is no need to cut it up in the middle, which makes manufacturing easier, and there is no risk of the chip mounting groove 17 (22) interfering with the back metal part between the chip mounting grooves 22° and 22 (1γ, 17). There is no need to increase the width of the tool body 10, and it is possible to prevent the entire tool from increasing in size.

Further, in this embodiment, as shown in FIGS. 5, 9, and 10, a cutting tip 31a.

Since 31b (31c, 31d) is installed with a step, it is possible to cut the workpiece without creating any burrs or edges on the cutting surface edge of the workpiece, so post-processing such as deburring is not required. Not only that, but the cutting blade tip 31a~
The lifespan of 31d can be extended.

As explained above, according to the milling tool of the present invention, the baseboard body is attached to the main body, and a plurality of chip attachment grooves are provided on the outer peripheral surfaces of each of the main and sub bodies to which cutting blade chips are respectively attached. In addition, the chip mounting grooves formed in the main body are inclined in the same direction and in the opposite direction with respect to the chip mounting seat formed in the sub body.
Not only can it prevent the generation of impact cutting loads and offset thrust loads, but it also increases the number of cutting chips that can be attached to the tool body, improving machining efficiency. can be achieved.

Moreover, it is easy to manufacture, and it is possible to prevent the entire tool from increasing in size.

[Brief explanation of drawings]

Figure 1 is a front view showing an example of a conventional staggered rotary cutting tool, Figure 2 is a vertical sectional view taken along the line ■-■ in Figure 1, and Figure 3 is a front view showing an example of a conventional staggered rotary cutting tool.
4 is a front view showing one embodiment of the staggered rotary cutting tool according to the present invention, FIG. 5 is a vertical sectional view taken along the line 4, FIGS. 7 and 8 are diagrams shown to explain the installation of the cutting blade tip, and FIGS. 9 and 10 are diagrams showing the state of the cutting edge of the cutting blade tip, respectively. It is. 10... Tool body, 11... Main body,
12...Sub-body, 1γ, 22...Chip mounting groove, 31a-31d...Cutting tip.

Claims (1)

[Claims] 1 A tool body is constructed by attaching a disk-shaped sub-body having the same outer diameter as the main body to the side surface of a disk-shaped main body, and cutting tips are attached to the outer peripheral surfaces of each of the main and sub-bodies, respectively. A plurality of chip mounting grooves are formed at intervals in the circumferential direction and in a staggered manner as a whole, and furthermore, the chip mounting grooves formed in the main body are inclined in the same direction,
A staggered rotary cutting tool characterized by being inclined in the opposite direction to the tip mounting groove formed in the sub-body.