JPH0239695Y2 - - Google Patents

Description

[Detailed description of the invention] The present invention relates to a counterbore cutter with a drill, and more specifically, the present invention relates to a counterbore cutter with a drill. This invention relates to a counterbore cutter with a drill configured to separate a waste discharge groove and a cutting waste discharge groove of the counterbore cutter so as to separately discharge the cutting waste.

Conventionally, a counterbore cutter with a drill built into the counterbore cutter has been used. This is because it is possible to drill a hole with a relatively small diameter and perform counterboring at the same time. Registered Utility Model Publication No.
No. 361230 discloses a structure in which this type of drill and a counterboring blade are integrated. That is, in this invention, an annular main body having a cutting blade provided in the conical part is fitted and fixed with screws.

However, such a configuration has low rigidity because the drill and the counterbore are substantially separated. Moreover, since the annular main body is fitted onto the outside of the conical part, the presence of the annular main body prevents the discharge of cutting chips by the drill. Furthermore, since the annular main body is fixed to the drill with screws, there is a concern that positional deviation may occur during cutting, making it impossible to achieve a highly accurate counterboring action.

On the other hand, Japanese Utility Model Publication No. 48-043942 discloses, in this type of cutter for spot boring, a configuration in which the cutter body for spot boring and the drill body are separated and the two are combined using a hard ball.

However, if the counterbore cutter body and the drill body are separated, as in the invention of Utility Model Publication No. 48-043942, it becomes difficult to align the drill and the counterbore blade, resulting in cutting defects, or Because the drill engages with the counterbore with some clearance, the drill rotates at high speed and shakes, which makes precise machining of the workpiece difficult and also reduces the durability of the cutter as a whole. This exposes the shortcoming of being shortened.

Furthermore, in order to ensure a predetermined rigidity, some devices employ a mechanism in which the cutting waste discharge groove of the drill and the cutting waste discharge groove of the counterbore cutter are shared.

However, with this configuration, the chips cut by different types of cutting blades of the drill and the counterbore cutter pass through the same discharge groove, so the narrow discharge groove structure is combined with a narrow discharge groove structure. Cutting debris clogging occurs in the discharge groove. In other words, when the drill and the counterbore cutter are rotated simultaneously, the large amount of cutting waste from the counterbore cutter prevents the cutting waste from being discharged from the drill to the outside, resulting in cutting waste clogging. . As a result, there are many accidents in which the drill itself breaks during cutting.

Therefore, as a result of intensive research and ingenuity, the inventor of the present invention formed the drill body and the counterbore cutter body integrally, and moreover, the terminal part of the cutting waste discharge groove of the drill body was connected to the rear part of the counterbore cutting blade. The drill cutting waste discharge groove and the cutting waste discharge groove of the counterbore cutter are substantially separated by extending sufficiently to the side, and furthermore, the cutting edge of the drill body is configured to be substantially separated from the cutting waste discharge groove of the counterbore cutter body. If configured to deviate by a predetermined angle,
There is no clearance between the drill and the counterbore cutter during assembly, and therefore there is no possibility that the drill itself will cause unusual wobbling during the cutting process.
Furthermore, since the cutting waste generated from the drill and the cutting waste generated from the counterbore cutter can be separated from each other by different discharge grooves and discharged to the outside, the discharge grooves are not clogged with the cutting waste. Therefore, it is possible to avoid accidents such as breakage of the drill itself during cutting, and since the rigidity is also increased, it is possible to feed the tool at high speed, which dramatically improves production efficiency. It has been found that a cutter can be obtained and the various problems mentioned above can be eliminated.

Therefore, the purpose of the present invention is to integrally configure the drill and the counterbore cutter, thereby achieving extremely high rigidity, and also being able to properly discharge the cutting waste itself, resulting in high machining accuracy. In addition, the present invention provides a counterbore cutter with a drill that has excellent durability.

In order to achieve the above object, the present invention comprises a counterbore section having a counterbore cutting edge and a twist-type drill section having a drill cutting edge, and the counterbore cutting edge is configured to rotate in a direction relative to the drill cutting edge. In a counterbore cutter with a drill provided offset in the opposite direction, the counterbore part and the drill part are integrally formed, and the counterbore cutting blade provided near the terminal end of the drill part is located at the front in the rotational direction. A counterbore cutting waste discharge groove is formed in the counterbore cutting waste discharge groove, and an inclined surface is extended from the counterbore cutting waste discharge groove through the ridge line portion, and a relief surface is further extended from this inclined surface to form a counterbore cutting waste discharge groove on the other counterbore cutting edge. The counterbore swarf discharge groove extends at least 90 degrees forward in the direction of rotation from the counterbore cutting surface with reference to the axis of the counterbore, while the drill swarf discharge groove extends at least 90 degrees forward in the direction of rotation based on the axis of the counterbore. It winds around from the part and terminates at the ridgeline part between the counterbore cutting waste discharge groove and the inclined surface and at a part that is set back from the counterbore cutting edge in the cutting direction, and the counterbore cutter is wound with respect to the drill cutting edge. It is characterized in that the blade is configured to be offset by 15° to 30° in a direction substantially opposite to the direction of rotation thereof.

Next, preferred embodiments of the counterbore cutter with drill according to the present invention will be described in detail with reference to the accompanying drawings.

In FIG. 1, reference numeral 10 indicates a counterbore cutter with a drill, and this counterbore cutter 10 includes a counterbore portion 12 and a twist-type drill portion 14
including. In this case, the counterbore portion 12 and the drill portion 14 are integrally constructed. The counterbore portion 12 has a first counterbore cutting blade 16 at its tip.
a and a second counterbore cutting edge 16b, and from each counterbore cutting edge 16a and counterbore cutting edge 16b, a first slope portion 18a and a first slope portion 18a as a flank extending in opposite directions from each other. 2 slope portions 18b are formed in advance. A first counterbore cutter for the counterbore cutter extends from the first counterbore cutting blade 16a to the opposite side of the first slope portion 18a.
A cutting waste discharge groove 20a for the countersink cutter is defined, and a second cutting waste discharge groove 20b for the countersink cutter extends from the second countersink cutting edge 16b to the opposite side of the second slope portion 18b. be done.

A first inclined surface 22a is formed which is deviated from the first cutting waste groove 20a by a predetermined angle and is oriented toward the second slope part 18b.
Similarly, a second inclined surface 22b is defined from b to the first inclined surface 18a. The drill portion 14 extends from a central portion of the first counterbore cutting edge 16a and the second counterbore cutting edge 16b. The drill part 14 has a third cutting waste discharge groove 24a and a fourth cutting waste discharge groove 24b which are spirally wound. A drill contact portion 26 will be formed.

The third cutting waste discharge groove 24b is a drill cutting edge 28.
A discharge groove 30 that extends from part a to the first inclined surface 22a and largely hollows out the first inclined surface 22a is defined, and this discharge groove 30 is located between the first cutting waste discharge groove 20a and the first inclined surface 22a. It terminates at a ridgeline portion 31 of. As can be easily understood from the figure, the terminal end portion of the discharge groove 30 occupies a position farther back than the first cutting edge 16a with respect to the cutting direction.

On the other hand, the fourth cutting waste discharge groove 24b extends from the second drill cutting edge 28b to the second inclined surface 22b,
Similarly, the discharge groove 3 that greatly hollows out the inclined surface 22b
form 0. That is, the third cutting waste discharge groove 24
a and the fourth cutting waste discharge groove 24b are respectively inclined surfaces 22
a, 22b into the cutting waste discharge groove 20.
a, 20b and extends to the counterbore portion 12 so as to terminate at a ridgeline portion 31 between them. In this case, as can be easily understood from FIG.
8a, 28b are substantially straight, while the countersunk cutting edges 16a, 16b are also substantially straight. However, in the present invention, the counterbore cutting blade 1 is used for the drill cutting blades 28a and 28b.
6a and 16b are offset by θ ₁ ° (see Fig. 4). In this case, it has been experimentally proven that a suitable cutting process can be carried out if the deviation angle is between 15° and 30°.

Similarly, as shown in FIG. 2, the first cutting waste discharging groove 20a and the second cutting waste discharging groove 20b extend substantially 90 degrees forward in the rotational direction from the cutting surfaces of the counterbore cutting edges 16a and 16b. It extends at an angle (θ ₂ ) greater than or equal to °. This is because consideration was given to securing a space for separating and leading out the cutting waste from the drill cutting blades 28a, 28b and the cutting waste from the counterbore cutting blades 16a, 16b, which are finally discharged beyond the ridge line portion 31. It is. In addition, in the figure, reference numerals 32a, 32
b is a chuck groove for chucking this counterbore cutter 10 with a drill.

The counterbore cutter with a drill according to the present invention is basically constructed as described above, and its operation and effects will be explained next.

Place the counterbore cutter 10 with a drill into the chuck groove 32.
a, 32b to a rotary drive source, and while driving the rotary drive source at high speed, the drill cutting blade 2
When the drill bits 8a and 28b are pressed against the workpiece, that is, the workpiece 40, the drill cutting edges 28a and 28b bite into the workpiece 40 and start cutting. The chips from the cut work material 40 are removed from the third chip discharge groove 24a.
Alternatively, the chips are sequentially sent out to the inclined surfaces 22a and 22b through the fourth cutting waste discharge groove 24b. The cutting waste that has reached the slopes 22a and 22b passes from the discharge groove 30 over the ridge line portion 31, and is passed through the first cutting waste discharge groove 20a and the second cutting waste discharge groove 20, which are vast spaces.
This will lead to the b side. That is, the discharge groove 30 that largely hollows out the inclined surfaces 22a and 22b is largely displaced in the cutting waste discharge direction by the ridgeline portion 31 between the inclined surfaces 22a and 22b. As a result, as shown in FIGS. 7 and 8, the cutting waste is discharged in the direction of the cutting waste discharge grooves 20a and 20b.

On the other hand, as the drill cutting blades 28a and 28b bite into the workpiece 40 by a predetermined distance, the first cutting blade 16a and the second cutting blade 16b of the counterbore portion 12 cut into the workpiece 40.
0 and starts the counterboring cutting operation integrally with the drill part 14. That is, the chips cut by the first cutting blade 16a and the second cutting blade 16b are led out to the outside from the first cutting waste discharge groove 20a and the second cutting waste discharge groove 20b. As shown in FIG. 7, in this case, the cutting waste of the drill part 14 and the cutting waste of the counterbore part 12 reach the first cutting waste discharge groove 20a and the second cutting waste discharge groove 2b, respectively. The actual discharge routes are different, and the cutting waste discharge grooves 20a, 20
b is actually a large open space expanded to θ ₂ °, that is, 90° or more, and
The end portions of the cutting waste discharge groove 20a and the second cutting waste discharge groove 20b are ridgeline portions 31. Since these parts are located further back in the cutting direction than the countersink cutting edges 16a and 16b, the cutting of the drill part 14 and the cutting waste of the countersink part 12 do not interfere with each other. . That is, since the cutting waste is guided to the outside through different routes, the cutting waste does not mix with each other during cutting.

In the end, the cutting waste discharge grooves 24a, 2 of the drill part 14
4b is not clogged with cutting waste, and no excessive load is applied during the cutting process. Therefore, there is no risk that the drill portion 14 will break. Furthermore,
As shown in FIG. 2, the first counterbore cutting edge 16a, the second counterbore cutting edge 16b, the first drill cutting edge 28a, and the second drill cutting edge 28b are at an angle of θ ₁ °, preferably 15° to each other. Due to the 30° offset, the evacuation of cutting chips is completely separated.

For reference, Figures 9 and 10 show the case where the deviation of the drill cutting edge and the counterbore cutting edge is 0°.
Examples of cases where the deviation is 45° or more are shown in FIGS. 11 and 12. When the degree of deviation is completely absent, that is, when θ ₁ ° is 0, the cutting chips generated by the drill cutting edge and the counterbore cutting edge coexist, resulting in clogging of the cutting chips. Further, when the degree of deviation is 45 degrees or more from each other, the two types of cutting waste are separated from each other and discharged, but there is a disadvantage that the rigidity of the cutter itself is weakened.

According to the present invention, since the twist type drill part and the counterbore part are integrally configured as described above, the positions of the drill part and the counterbore part can be determined.
Therefore, there is no occurrence of drill runout or the like due to the clearance caused by the structure in which the drill and the counterbore cutter are separated. Moreover, since the cutting waste discharge groove of the drill and the cutting waste discharge groove of the counterbore cutter are separated by changing the angle, the cutting waste produced by the drill is separated from the cutting waste produced by the counterbore cutter. There is no possibility of losing and causing cutting waste clogging. Furthermore, since the cutting edge of the drill and the cutting edge of the counterbore cutter are offset within the range of 15° to 30°, sufficient rigidity of the cutter body can be ensured.

As described above, according to the present invention, there is provided a counterbore cutter with a drill that can perform highly accurate cutting with a simple configuration, is highly rigid, and can easily avoid accidents such as breakage. It will be done.

Although the present invention has been described above in detail by citing preferred embodiments, the present invention is not limited to these 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 perspective view of a counterbore cutter with a drill according to the present invention, Fig. 2 is a front view of the cutter shown in Fig. 1, Fig. 3 is a side view of the cutter shown in Fig. 1, and Fig. 4 is a side view of the cutter shown in Fig. 1. 3 is a sectional view taken along the - line in FIG. 3, FIG. 5 is a partially omitted explanatory view of the cutter shown in FIG. The figure is a partially cutaway front view showing the relationship between the cutter and cutting waste according to the present invention during cutting,
Fig. 8 is an explanatory diagram showing the relationship between the cutter of the present invention and cutting waste during cutting, and Fig. 9 shows the relationship with cutting waste when there is no deviation in the angle between the drill cutting edge and the counterbore cutting edge. Fig. 10 is an explanatory diagram showing the relationship between the cutter and cutting waste discharge shown in Fig. 9, Fig. 11 is a partially cutaway front view shown in Fig. FIG. 12 is an explanatory view showing the relationship between the cutter shown in FIG. 11 and the discharge of cutting waste. 10...Spot facing cutter with drill, 12...Spot facing part, 14...Drill part, 16a, 16b...
Cutting blade, 18a, 18b...Slope portion, 20a, 20
b... Cutting waste discharge groove, 22a, 22b... Inclined surface, 24a, 24b... Cutting waste discharge groove, 26...
Drill contact portion, 28a, 28b...Drill cutting edge, 30...Discharge groove, 31...Ridge line portion, 32
a, 32b...chuck groove, 40...work material.

Claims (1)

[Scope of utility model registration request] A seat with a drill comprising a counterbore part having a counterbore cutting edge and a twist-type drill part having a drill cutting edge, with the counterbore cutting edge being offset in a direction opposite to the direction of rotation of the drill cutting blade. In the counterbore cutter, the counterbore part and the drill part are integrally formed, a counterbore cutting waste discharge groove is formed forward in the rotational direction of the counterbore cutting blade provided near the terminal end of the drill part, A sloped surface extends from the counterbore cutting waste discharge groove through the ridge line portion, and a relief surface further extends from this slope and terminates at the back surface of the other counterbore cutting blade, and the counterbore cutting waste discharge groove The drill cutting swarf discharge groove extends at least 90 degrees forward in the rotational direction from the counterbore cutting surface with reference to the axis of the counterbore part, and the drill cutting swarf discharge groove wraps around from the tip of the drill to form the counterbore cutting swarf discharge groove. and the sloped surface, and terminates at a part that is set back in the cutting direction from the countersink cutting edge, and the countersink cutting edge is substantially rotated in the direction opposite to the direction of rotation relative to the drill cutting edge.
A counterbore cutter with a drill, characterized in that it is configured to deviate by 15° to 30°.