JPH02212007A - Drilling machine - Google Patents

Abstract

PURPOSE:To avoid damage to holes so as to prevent reduction in machining accuracy in a drilling machine for drilling holes with its drills extended through bushes by breaking chips from a work shorter by means of projections provided on the lower faces of the bushes. CONSTITUTION:With a drilling machine. 10, its drills 11 are extended through nearly cylindrical bushes 12. Each of the bushes 12 has a collar part 12a on its outer peripheral surface 12b, and is provided with plural projections 13 on the lower face 12b. For the projection 13, its tip part is formed into an acute-angled cutting edge, and directed to the direction opposite to the direction of rotation of the drill 11. The inclination of the front face of the projection 13 to the lower face 12b of the bush 12 is desired to be less than 90 deg., but it, of course, may be set at any other angles. When the drilling machine 10 drill the holes, chips from a work 15 are caught on the projections 13 and broken, and thereby coiling of the chips round the drills can be prevented.

Description

[Detailed description of the invention] a. Industrial application field The present invention relates to a hole processing machine.

b. Conventional techniques and their problems Conventionally, there are hole-cutting machines that drill holes by inserting a drill or reamer into a pusher.

FIG. 6 shows such a conventional hole processing machine 1. As shown in FIG.

In this hole processing machine 1, the drill 2 is inserted through the push 3, and since the drill 2 is supported by the push 3 and the push plate 4 during hole drilling, it is possible to drill holes with high accuracy.

By the way, in such a conventional hole processing machine, the workpiece 5
When drilling a hole in the hole, the chips 6 of the workpiece 5 (see FIG. 7) were long and wound around the drill 2 and the pusher 3. In this way, when the chips 6 wrap around the drill 2, they enter the cutting hole 7 of the workpiece 5 together with the drill, damaging the inside of the hole (see Figure 8) and reducing the machining accuracy. .

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a hole machining machine that can prevent a decrease in the accuracy of hole machining.

Means for Solving the C0 Problems In the present invention, in order to achieve the above object, in a hole processing machine that drills holes by inserting a drill into the push, a protrusion is provided on the lower surface of the push.

d. Examples Hereinafter, examples of the hole processing machine according to the present invention will be described in detail with reference to the accompanying drawings.

FIG. 1 shows an embodiment of the present invention.

In the hole processing machine 10 of this embodiment, the drill 11 is inserted through a substantially cylindrical push 12. The pusher 12 has a collar portion 12a on its outer peripheral surface, and a lower surface 1 thereof.
2b has a plurality of protrusions 13. Here, the protrusion 13 has a tip 13a that is an acute-angled blade, and is formed to face in a direction opposite to the rotating direction of the drill 11 (see FIGS. 2 and 3), and a front surface 13b of the protrusion 13. The angle α between the pusher 12 and the bottom surface 12b of the pusher 12 is preferably an acute angle smaller than a right angle, but is of course not limited to this.

The pusher 12 is fitted and supported in the hole 14a of the pusher plate 14.

When a hole is drilled into a workpiece 15 by the hole processing machine 10 of this embodiment, the chips 16 of the workpiece 15 are caught on the protrusion 13 of the pusher 12 and cut into an appropriate short length, and the drill 11
Wrapping around itself is prevented (see FIGS. 4 and 5).

Note that the present invention is not limited to the above-mentioned embodiment, and for example, a reamer may be used instead of a drill, and the shape of the protrusion is not particularly limited.

e. As described in detail, according to the hole processing machine of the present invention, the protrusions provided on the lower surface of the pusher cut the chips of the workpiece into shorter pieces, so that they do not get wrapped around the drill or reamer. is prevented, therefore, without damaging the hole.
It is possible to prevent the processing accuracy from decreasing.

[Brief explanation of the drawing]

1 to 5 show one embodiment of the present invention, FIG. 1 is a conceptual diagram showing the hole processing machine, FIG. 2 is an enlarged view of the main parts, and FIG. A diagram showing an enlarged view of the part indicated by arrow A in the figure, FIG. 4 is a diagram showing how the chips of the workpiece are cut, and FIG. 5 is a diagram showing the cut chips.
FIG. 6 is a conceptual diagram showing a conventional hole machining machine, FIG. 7 is a diagram showing chips produced by the conventional hole machining machine, and FIG. 8 is a diagram showing the state of hole machining by the conventional hole machining machine. lO...hole processing machine, 11...drill, 12.
...Push, 13...Protrusion. Figure 1 Figure 5 Figure 7

Claims (1)

[Claims] A hole processing machine for drilling a hole by inserting a drill into a pusher, characterized in that a projection is provided on the lower surface of the pusher.