JPS5894906A - Drill and drilling method using the drill - Google Patents

Abstract

PURPOSE:To improve the work efficiency by using a hollow drill which absorbs and discharges powdery or granular chips and maintaining coolness of the drill. CONSTITUTION:A drill 1 has a hollow part 2 along the core of its shaft and said part 21 is opened to a blade edge part 10 and a discharge part 25. The drill 1 is inserted in a shaft core hole 3 of a tail stock 2 of a lathe through a sleeve 31 and communicates with a negative pressure generation device 6. When a work 8 fixed in a chuck 7 is rotated and a hole is drilled in it by means of the drill 1, chips become powdery or granular and are absorbed due to absorption power of a netative pressure generation device via the hollow part 21 and discharged. The drill is cooled due to absorption and its life is lengthened.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a drill for use on a workpiece whose cutting waste is in the form of powder or granules.

When attaching a drill or drill-like cutting tool to a machine tool such as a drill press or lathe to drill deep holes in calcined ceramic crystals, carbon, plastic, Bakelite, wood, etc., the cutting waste becomes powder or granules and may cause damage during the machining process. Since it is difficult to discharge the chips smoothly from the hole, it is necessary to discharge the chips during machining, which reduces work efficiency and hinders machining automation.

An object of the present invention is to provide a drill that allows smooth discharge of cutting waste, improves work efficiency, automates processing, and allows cooling of the drill during drilling operations in which the cutting waste becomes powder or granules. purpose.

Next, the present invention will be explained based on an embodiment shown in the drawings.

Reference numeral 1 shows a drill according to the present invention, in which a cutting edge 13 is provided on a tip end surface 12 and a helix angle is provided on a side circumferential surface 14.
5.16 and a groove 17.18, and a hollow part 21 that is open at the front and rear ends and extends along the axis.
, and the open tip surface 22 is the rear end surface 1 of the tip blade portion.
9 and communicates with the bottom of the groove 11.18 to form a suction port 23.24, and the rear end opening consists of a support shaft 20 forming a discharge port 25.

As shown in FIG. 2, this drill 1 has a rear end 26 of a support shaft fitted through a sleeve 31 into an axial center hole 3 of a tailstock 2 mounted on a lathe, and a tube connecting fitting attached to the tailstock 2. 4 is attached, a tube 5 is connected to the metal fitting 4, and a negative pressure is applied to the discharge port 25 of the drill via the tube 5 by a negative pressure generator 6. When the workpiece 8 fixed to the chuck 7 is rotated and the drill 1 is pressed against the workpiece 8, powder or granular cutting waste is sucked together with air from the suction ports 23 and 24, and is discharged from the discharge port 25 to complete the cutting operation. It can be done smoothly. Moreover, the drill 1 is cooled by air during operation, and its durability can be improved.

Note that the drill of the present invention is not limited to the embodiment shown in FIG. 1, and may be an integrally molded product, and the suction port is opened in the radial direction as in the above embodiment for smooth suction of cutting debris. Although preferred for this reason, a circumferential opening may also be used.

Furthermore, the drill of the present invention can also be used for a drilling machine, and in this case, since the drill rotates, the negative pressure generator and the drill outlet are connected by a coupling or a coupling mechanism that allows relative rotation in an airtight state. Ru.

As described above, the drill of the present invention has a suction port that opens at the tip of the cutting edge, and a communication hole that communicates with the discharge port provided at the rear end through the axis, so that it can be rotated relative to the workpiece and By drilling while applying negative pressure to the discharge port, the cutting waste can be smoothly discharged in the drilling process where the cutting waste becomes powder or granules, improving work efficiency and automating the process. At the same time, it is possible to cool the drill.

[Brief explanation of drawings]

FIG. 1 is a sectional view showing an embodiment of a drill according to the present invention, and FIG. 2 is a view of the main parts of a lathe showing an embodiment of a drilling method using the drill. In the diagram: 1...Drill, 10...Tip blade, 20...
・Spindle part Fig. 1 Fig. 2

Claims (1)

[Scope of Claims] 1) A drill that has a suction port that opens at the tip of the cutting edge and a communication hole that communicates with a discharge port provided at the rear end through the axis. 2) A blade having a suction port opened at the tip of the cutting edge and a communication hole communicating with the discharge port provided at the rear end through the axis is rotated relative to the workpiece and a negative force is applied to the discharge port. A drilling method characterized by drilling while applying pressure. 3) A cutting edge portion having a cutting edge surface provided with a cutting edge, a groove, and a curved surface provided with a cutting edge, and a hollow portion that is brazed to the rear end of the cutting edge portion and having a hollow portion along the axis. Claim 1, comprising a spindle having a discharge port at the rear end, and a groove in the tip blade and a hollow portion on the tip surface of the spindle open at the bottom of the groove in the tip. Drill described in item 1.