JPS58177214A - Drill - Google Patents

Abstract

PURPOSE:To provide a drill which can be fed at its tip with sufficient cutting oil when it is used for deep hole drilling and as well which is simple in manufacturing. CONSTITUTION:A drill comprises a body 2 formed with chip discharge grooves 10 and a shank 10 provided in the base end side of the body. A liquid guide groove 28 is formed in the auxiliary flank 20 of the body 2, extending from the base end of the body 2 to the tip of the drill substantially in parallel with the chip discharge grooves 10. Cutting oil may be fed to the drill tip easily without hindrance by chips since it is led through the exclusive liquid guide groove formed independently from the chip guide grooves 10. The liquid guide groove 28 may be easily formed in the auxiliary flank since the latter is the outer surface of a land 12.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a drill, and particularly to facilitating the supply of cutting fluid to the tip.

When drilling a deep hole with a drill, in order to sufficiently supply cutting fluid to the tip, it has been conventional practice to form a liquid guide hole for guiding the cutting fluid into the land of the drill.

However, it is not easy to form this liquid guide hole, especially when it is necessary to rely on a machinist to form the liquid guide hole in small-scale production. is remarkable.

The present invention has been made against the background of the above, and therefore, its purpose is to provide a drill that can supply sufficient cutting fluid to the tip and is easy to manufacture. be.

In order to achieve this object, the first aspect of the invention is to provide a drill equipped with a pode having a chip discharge groove and a shank provided on the proximal end side of the pode. A liquid guide groove is formed on the surface from the base end to the tip end of the pod, substantially parallel to the chip discharge groove. With this arrangement, the cutting fluid is provided separately from the chip discharge groove. Moreover, since the liquid guide groove is formed on the sub-flank surface which is the outer surface of the land, it is easy to form, especially when the liquid guide groove is formed by machining on a small diameter drill. The effect is remarkable.

Further, in a second invention, a liquid guide pipe is embedded in a groove corresponding to the liquid guide groove in the first invention, and one end of this pipe is communicated with a liquid guide hole formed in the shank, while the other end is connected to the liquid guide hole formed in the shank. The reason is that we have reached the very tip. In this way, the cutting fluid is forcibly supplied to the tip of the drill from the fluid guiding hole in the shank through the fluid guiding pipe, and the reliability of cutting fluid supply is improved. Moreover, instead of forming a liquid guide hole inside the land, it is only necessary to form a groove on the sub-flank surface, which is the outer surface of the land, and then embed the liquid guide pipe in the groove, which is easy to manufacture. A remarkable effect can be obtained in manufacturing small diameter drills.

Hereinafter, two or three embodiments of the present invention will be described in detail with reference to the drawings.

What is shown in FIG. 1 is a straight-edged drill that is an embodiment of the present invention, and consists of a body 2, which is the main part, and a shank 4, etc., which is formed continuously from the base end of the body 2. . A portion of the body 2 having a certain length from the tip is a prismatic effective part 6, and the diameter of a circle 7 circumscribing this effective part 6 is larger than the diameter of the shank 4. The remaining part of the body 2 which has been cut is formed into a cylindrical neck 8 having the same diameter as the shank 4. From this effective portion 6 to the neck 8, a chip discharge groove 10 parallel to the axis is formed over the entire length of the warp body 2. Two chip discharge grooves 10 are formed with a cross-sectional shape as shown in FIGS. The land 12 is formed into two tree shapes. A main cutting edge 14 and a main relief 16 are formed at the tip of the effective portion 6, and a sub-cutting edge 18 and a sub-relief 20 are similarly formed on the outer peripheral surface of the effective portion 6.

A groove 22 separate from the chip discharge groove 10 is formed in the body 2. As is clear from FIG. 1, this groove 22 is formed from the sub-flank surface 20 of the effective part 6 to the outer circumferential surface 24 of the neck 8, parallel to the axis of the body 2, and extending over almost the entire length of the body 2. has been done. As is clear from FIGS. 2 and 8, the groove 22 has a substantially semicircular cross-sectional shape in the effective portion 6 and a U-shape in the neck 8. A pipe 26 made of aluminum is embedded and fixed by brazing. Approximately half of the cross-sectional area of the pipe 26 in the effective part 6 protrudes from the sub-relief 20, but the circumscribed circle 7 of the effective part 6
It is provided inside the hole and does not come into contact with the inner peripheral surface of the hole to be machined during machining. One end of the pipe 26 opens near the tip of the effective portion 6, and the other end communicates with a liquid guide hole 28 formed in the shank 4.

More specifically, in the shank 4, a liquid guide hole 28 passes through the shank 4 along the axis from the distal end surface 30 to the neck 8.
5- Formed at a depth that slightly plunges into the eaves. Two inclined branch passages 32 extend from the bottom of the liquid guide hole 28 until they are connected to the groove 22. The end of the pipe 26 embedded in the groove 22 is inserted into the branch passage 32 and communicated with the liquid introduction hole 28.

When performing deep hole cutting using the drill constructed as described above, when the shank 4 is gripped by the chuck, the distal end surface 30 must be brought into close contact with the cutting fluid supply port that opens deep inside the chuck. let If machining is performed while supplying cutting fluid in this state, the cutting fluid will be forcibly fed from the fluid guide hole 28 through the pipe 26 and will be reliably supplied to the tip of the drill. Moreover, the only drilling required to manufacture such a drill is to form a relatively shallow liquid guide hole 28 and a short branch passage 32, and in the case of a long body 2, it is sufficient to make an outward groove. , easy to manufacture. Furthermore, in this embodiment, since the pipe 26 is disposed in the effective portion 6 with about half of its cross-sectional area protruding from the sub-flank surface, the free radius of the groove 22 is shallow, but the cutting fluid does not flow. It is fed through passages of sufficient cross-sectional area.

Although one embodiment has been described in detail above, the present invention can be implemented in other embodiments as well. That is, as shown in FIG. 6, it is also possible to apply the present invention to a drill equipped with a Taber shank 40, and as shown in FIG. 7, it is also possible to apply the present invention to a drill having a diamond tip 42. . The embodiment shown in FIGS. 6 and 7 is the same as the embodiment described above in other respects, so the same parts are given the same reference numerals to indicate the correspondence with the embodiment described above. , detailed explanation will be omitted.

Yet another embodiment is shown in FIG. This corresponds to the drill shown in FIG. 1 with the pipe 26 removed, and since the other parts are the same, the same reference numerals are given to indicate the correspondence between the two embodiments, and a detailed explanation will be omitted. Do I of this example
During Jt cutting, the cutting fluid supplied to the liquid guide hole 28 is supplied to the groove 22 through the branch passage 82, and is transmitted through the groove 22 and supplied to the tip of the drill through the flow hole. Since the cutting fluid is not pumped, the ability to supply cutting fluid to the tip is significantly inferior compared to the above embodiments, but it is easier to manufacture since there is no need to bury the pipe 26. It has the features that make it possible. In addition, the liquid guide hole 28 of the sink A/ink 4 is omitted, and the cutting fluid is supplied directly to the groove 22 from the cutting fluid supply port deep inside the sink by extending the groove 22% and the shank 4. It is also possible to form the liquid guiding groove only in the sub-recess 20 of the effective part 26, and a certain effect can be obtained.

Furthermore, in each of the embodiments described above, only a certain length portion on the tip side of the body 2 was used as the effective portion 6, and the remaining long portion was defined as the neck 8. However, if the neck 8 is short or It is also possible to apply the present invention to a type of IJ/IJ in which the effective portion 6 is not formed and substantially the entire length of the body 2 is the effective portion 6. Further, although the present invention is most effective when applied to a straight 4J drill, it can also be applied to a screw drill. It is sufficient to form the groove almost parallel to the discharge groove.

It goes without saying that the thin ice invention can be implemented in various modifications and improvements based on the knowledge of those skilled in the art without departing from the scope of the claims.

[Brief explanation of the drawing]

FIG. 1 is a front view showing a straight-edged drill that is an embodiment of the present invention, FIG. 2 is a view taken in the direction of arrow A in FIG. 1, and FIG. The sectional view, Figure 4 is the (, C sectional view, and Figure 5 is 1 in Figure 4) in Figure 1.
-B sectional view. FIG. 6, FIG. 7, and FIG. 8 are front views showing other embodiments of the present invention. 2: Body 4: Shank 10: Chip discharge groove 12: Land 14: Main cutting edge 1
6: Main flank 18: Sub-cutting edge 20: Sub-flank 22: Groove 26: Pipe 28: Liquid guide hole 40: Taper shank 9- Fig. 1 Fig. 2 Measure 3 Fig. 6 Fig. 7 Fig. 8 80-

Claims (2)

[Claims] (1) In a drill equipped with a pode having a chip evacuation groove and a shank provided at the proximal end of the pode, the chip evacuation groove is formed on the sub-flank surface of the pode from the proximal end of the pode to the distal end of the pode. A drill characterized in that a liquid guide groove is formed almost parallel to the . (2) A drill equipped with a pode having a chip discharge groove and a shank provided at the proximal end of the pode, in which a liquid guide hole is formed in the shank and passes through the shank over almost the entire length; Another groove is formed on the sub-flank surface of the pode, from the base end to the tip of the pode, approximately parallel to the chip discharge groove, and a liquid guide pipe is buried in the other groove. Drill.