JPS61100307A - Counter boring tool provided with drill - Google Patents

Abstract

PURPOSE:To enhance the machining accuracy and durability of a counter boring tool, by incorporating a drill integrally with the counter boring tool, and by shifting the abutting section of the drill from the counter boring edge of the counter boring tool by a predetermined angle, thereby it is possible to make smooth the discharge of chips from the counter boring tool provided with the drill. CONSTITUTION:A drill section 14 is integrally incorporated with the counter boring section 12 of a counter boring tool 10 provided with a drill. The counter boring section 12 has cutting edges 16a, 16b and is formed therein with inclined surface parts 18am, 18b which extend in opposite directions from the cutting edges 16a, 16b, respectively. Chips discharge groove 20a, 20b are defined to be extended on the opposite sides of the inclined surface parts 18a, 18b, respectively. Meanwhile the drill section 14 is formed therein with chip discharge grooves 24a, 24b which define an abutting part 26. Drill cutting edges 28a, 28b are formed to be linear, and the counter boring cutting edges 16a, 16b are similarly linear, and the counter boring cutting edges 28a, 28b are sifted from the drill cutting edges by an angle of 15 to 30 deg..

Description

[Detailed Description of the Invention] The present invention relates to a spot-boring force/stalk with a drill.
Moreover, a countersink mill with a drill is configured to separate the cutting waste discharge groove of the drill itself and the cutting waste discharge groove of the counterbore cutter and discharge the cutting waste separately, while maintaining a predetermined rigidity. Regarding 7ter.

Conventionally, counterboring cutters have been used that incorporate a drill into the counterboring force and vine. This is because it is possible to drill a hole with a relatively small diameter and perform counterboring at the same time. Utility Model Publication No. 48-43.942 discloses a structure for this type of counterboring cutter, in which the counterboring cutter main body and the drill main body are separated and the two are combined using steel balls. .

By the way, as shown in the above-mentioned publication, if the counterbore cutter main body and the drill are configured separately, it becomes difficult to align the drill and the counterbore blade, resulting in cutting defects or damage to the counterbore part. Because the drill engages with a slight clearance, the drill rotates at high speed and shakes, which makes precise machining of the workpiece difficult and shortens the durability of the cutter as a whole. to expose. Furthermore, in order to ensure a predetermined rigidity, it is common to share the cutting waste discharge groove of the drill with the cutting waste discharge groove of the counterbore cutter. For this reason, the cutting chips cut by different types of cutting blades of the drill and the counterbore cutter pass through the same discharge groove, and together with the narrow discharge groove structure, the cutting chips are stored inside the discharge groove. A blockage will occur. That is, when the drill and the countersink cutter are rotated simultaneously, the large amount of chips from the countersink cutter prevents the cuttings from being discharged from the drill to the outside, resulting in a clogging of the chips. As a result, there are many accidents in which the drill itself breaks during cutting.

Therefore, as a result of intensive research and efforts, the inventors of the present invention formed a drill main body and a counterbore cutter main body integrally, and moreover, the cutting waste discharge groove of the drill and the cutting waste of the counterbore cutter were formed integrally. If the discharge groove is separated from the drain groove and the cutting edge of the drill body is configured to be displaced at a predetermined angle with respect to the cutting edge of the counterbore cutter, the clearance between the drill and the counterbore cuffer during installation can be reduced. Therefore, there is no possibility that the drill itself will cause unusual runout during the cutting process, and furthermore, the cutting waste generated from the drill and the cutting waste generated from the countersink cutter are separated by different discharge grooves and discharged to the outside. Since the cutting waste is discharged, the discharge groove is not clogged with cutting debris, and therefore, it is possible to avoid accidents such as breakage of the drill itself during cutting.Furthermore, since the rigidity is increased, the tool can be fed at high speed. It has been found that a counterbore cuffer with a drill has been obtained that enables production efficiency to be improved at once, and that the various problems mentioned above can be eliminated. (Accordingly, the object of the present invention is to integrally configure a drill and a countersink cutter, so that the rigidity is extremely strong, and furthermore, the cutting waste itself can be properly discharged, and the machining accuracy is high. To provide a counterbore cutter with a drill having excellent durability.

In order to achieve the above object, the present invention includes integrally forming a countersinking part having a counterboring cutting edge and a drill part having a cutting edge, and forming the drill part at a terminal part of the drill part. It is characterized in that the drill contact portion is configured to be displaced by a predetermined angle with respect to the counterbore cutting edge.

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

In FIG. 1, reference numeral 1o indicates a counterbore cutter with a drill, and this counterbore cuffer 10 includes a counterbore portion 12 and a drill portion 14. As shown in FIG. In this case, the counterbore portion 12 and the drill portion 14 are integrally constructed.

The counterbore portion 12 has a first cutting edge 16a and a second cutting edge 16b at its tip, and a first slope extending in opposite directions from each cutting edge 16a and cutting edge 16b. A portion 18a and a second slope portion 18b are formed in advance. Said first cutting edge 1
6a extends to the opposite side of the first slope portion 18a to define a first counterbore cutter cutting waste discharge groove 20a, while from the second cutting edge 16b to the opposite side of the second slope portion 18b. A second cutting waste discharge groove 20b is defined by extending therefrom.

An inclined surface 22a is formed from the first cutting waste discharging groove 20a at a predetermined angle and oriented toward the second inclined surface part 18b, and on the other hand, from the second cutting waste discharging groove 20b, the first inclined surface part 1 is also formed.
A second inclined surface 22b is defined relative to 8a. on the other hand,
The drill portion 14 extends from a central portion of the first cutting edge 16a and the second cutting edge 16b. The drill part 14 has a third cutting waste discharging groove 24a and a fourth cutting waste discharging groove 24b that circulate in a spiral manner. Therefore, these cutting waste discharging grooves 24a
, 24b form a drill contact portion 26. The third cutting waste discharge groove 24a is a drill cutting edge 28.
From part a to the inclined surface 22a, this inclined surface 22a
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, and similarly defines a discharge groove 30 that greatly hollows out the inclined surface 22b. Form a groove.

That is, the third cutting waste discharge groove 24a and the fourth cutting waste discharge groove 24b extend up to the counterbore portion 12 so as to deeply bite into the inclined surfaces 22a and 22b, respectively.

In this case, as can be easily understood from FIG. 2, the drill cutting edges 28a, 28b are substantially straight, while
The counterbore cutting edges 16a, 16b are also substantially straight. However, in the present invention, the drill cutting edges 28a, 28
For b, the counterbore cutting edges 16a and 16b are displaced by θ° (see FIG. 4). In this case, it has been experimentally proven that a suitable cutting process can be carried out if the displacement angle is set to 15° to 30°. In addition, in the figure, reference numeral 32a
.

Reference numeral 32b is a chuck groove for chucking this counterbore cuffer 10 with a drill.

The counterbore cutter with 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 grooves 32a, 32.
If the drill cutting blades 28a, 28b are attached to a rotary drive source via the rotary drive source and pressed against the workpiece, that is, the workpiece 40 while driving the rotary drive source at high speed, the drill cutting blades 28a, 28b It bites into the work material 40 and starts cutting. Chips from the cut work material 40 are removed from the third discharge groove 24
a or the inclined surface 22a via the fourth discharge groove 24b,
22b side. Inclined surfaces 22a, 22b
The cutting waste that has reached this point passes through the discharge groove 30 and is led out to the wide-diameter first cutting waste discharge groove 20a and second cutting waste discharge groove 2Ob. That is, the grooves 30 that greatly gouge the slopes 22a and 22b greatly displace the cutting waste discharge direction due to the ridge line 31 between the slopes 22a and 22b. As a result, as shown in FIGS. 7 and 8, the cutting waste discharge groove 20a
, 20b are discharged. On the other hand, as the drill cutting blades 28a and 28b bite into the workpiece powder 40 for a predetermined distance, the first cutting blade 16a and the second cutting blade 1 of the counterbore portion 12
6b comes into contact with the workpiece 40 and starts a countersink cutting operation integrally with the drill part 14. That is, the first cutting edge 16a,
The chips cut by the second cutting blade 16b are led out to the outside from the first chip discharge groove 20a and the second chip discharge groove 20b. As shown in FIG. 7, in this case, the drill part 14
The cutting waste from the counterbore portion 12 and the cutting waste from the counterbore portion 12 reach the first cutting waste discharge groove 20a and the second cutting waste discharge groove 20b, respectively, but their respective substantial discharge routes are different, and the discharge groove 20a,
20b faces a large open space, so the cutting by the drill part 14 and the cutting by the counterbore part 12 do not interfere with each other. That is, since the cutting chips are guided to the outside through different routes, the chips do not mix with each other during cutting.

As a result, the discharge grooves 24a and 24b of the drill part 14 are not clogged with cutting waste, and no heavy load is applied during the cutting process. Therefore, there is no risk that the drill portion 14 will break. Furthermore, the first cutting edge 16a, the second cutting edge 16b
and the first drill cutting edge 28a1 and the second drill cutting edge 28b are at an angle of θ°, preferably 15° to 3
Due to the 0° displacement, the cutting waste is discharged completely separately.

For reference, the degree of displacement between the drill cutting edge and the counterbore cutting edge is O.
9 and 10 show the case where the drill cutting edge and the counterbore cutting edge are displaced by 45° or more from each other, and FIG. 11 and 12 show examples of the case where the drill cutting edge and the counterbore cutting edge are displaced by 45° or more from each other. When there is no degree of displacement at all, that is, when θ° is 0, the cutting chips generated by the drill cutting edge and the counterbore cutting blade coexist, eventually causing clogging of the cutting chips. Also, the degree of displacement is 4
When the angle is more than 5 degrees, 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 drill part and the counterbore part are integrally configured as described above, the positions of the drill part and the counterbore part are definite, and therefore the drill and the counterbore cutter can be separated. There is no occurrence of drill runout due to the clearance caused by the structure. Moreover, since the cutting waste discharge groove of the drill and the cut waste discharge groove of the counterbore cutter are separated by changing the angle, the cutting waste generated by the drill is defeated by the cutting waste generated by the recutter. There is no possibility of cutting jam. Furthermore, the drill cutting edge and the counterbore cutter cutting edge are 15° to 30°.
Since the cutter body is displaced within a range of 100°, sufficient rigidity of the cutter body can be ensured.

As described above, according to the present invention, it is possible to obtain a counterbore cutter that can perform highly accurate cutting with a simple configuration, has high rigidity, and can easily avoid accidents such as breakage. .

Although the present invention has been described above in detail with reference to 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 drawings]

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. IV- in Figure 3
5 is a partially omitted explanatory view of the cutter shown in FIG. 3 displaced by 90 degrees, FIG. 6 is a sectional view of the web of the cutter shown in FIG. 3, and FIG. 7 is in the middle of cutting. FIG. 8 is an explanatory view showing the relationship between the cutter of the present invention and cutting waste during cutting, and FIG. 9 is a drill cutting edge. FIG. 10 is a partially cutaway front view showing the relationship between the cutter and the cutting waste when there is no displacement in the angle of the countersunk cutting edge; FIG. 10 is an explanatory diagram showing the discharge relationship between the cutter shown in FIG. The figure is a partially cutaway front view showing the relationship between cutting when the angle between the drill cutting edge and the counterbore cutting edge is displaced by 45 degrees or more.
FIG. 2 is an explanatory diagram showing the relationship between the cutter shown in FIG. 1 and the discharge of cutting waste. 10 °-FIJ/L/Isunza
112・
・Spot facing part 14...Drill part 16a, 1
6b... Cutting blades 18a, 18b... Slope portions 20a, 20b... Cutting waste discharge grooves 22a, 22b... Slanted surfaces 24a, 24b... Cutting waste discharge groove 26... Drill contact portions 28a, 28b... Drill cutting Blade 30... Discharge groove 31... Ridge line 32a,
32b... Chuck groove 40... Work material - 4' / Procedural amendment issued by Toru 1, Director General of the Patent Office, November 22, 1985, Toru Uga Renbe, Indication of the case, 1982 Patent Application No. 222428 3 , Relationship to the case of the person making the amendment Patent applicant address (residence) 2-1-1 Minami-Aoyama, Minato-ku, Tokyo Name: Honda Motor Co., Ltd. 4, Agent 5, Date of amendment order Voluntary 1, Details On page 9 of the book, line 12, it says, "In order to be..., comrade Kirizumi..." is replaced with "
. . . so that the chips are separated from each other..." 2) On page 9, line 15, the phrase "...load during the process" will be corrected to "...overcurrent during the process."

Claims (3)

[Claims] (1) A counterbore part having a counterbore cutting edge and a drill part having a cutting edge are integrally formed, and a drill contact part forming the drill part at the terminal end of the drill part is connected to the counterbore cutting edge. A counterbore cutter with a drill, characterized in that it is configured to be displaced at a predetermined angle with respect to the drill. (2) In the counterbore cutter with a drill according to claim 1, the drill contact portion is 1.
A counterbore cutter with a drill that can be displaced in the range of 5° to 30°. (3) In the counterbore cutter with a drill according to claim 1 or 2, a discharge groove for cutting waste cut by the drill cutting blade and a discharge groove for cutting waste cut by the counterbore cutting blade are provided. A counterbore cutter with a drill that is formed by separating and forming.