JPS5828410A - Boring machine - Google Patents

Abstract

PURPOSE:To perform the boring with quite high accuracy by performing the reciprocal motion of a drill through the cam mechanism of an inclined face. CONSTITUTION:In a boring machine, the rotation of a motor 1 is transmitted to a shaft 2 thus to drive two gears 5, 6 where the gears 3, 4 having different number of teeth are provided on same axis with different rotation. The shafts 8 and 7 are collided to form an inclined face 10 at this portion. The drill 19 is fixed by a collet chuck 20 to the shaft 8 and rotated by the gear 6 while projected from the arm 18 through a cam of the inclined face 10. Said projection is adjusted through the rotation of an adjuster 16 thus to perform the boring of desired depth accurately.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to the structure of a drilling device for drilling holes of a certain depth.

Spot-welded steel plates can be easily removed by drilling a hole in a single steel plate at the welded area, but it is extremely difficult to drill a suitable hole in a thin steel plate, requiring a precision jig or a precision machine such as a lathe. .

For example, steel plates for automobiles use steel plates with a thickness of 0.6 to 0.7 fl, and therefore only an error of about 0.1 fl is allowed when drilling a hole in only one of two stacked sheets.

Moreover, such a drilling device must be easily portable and must be small and lightweight.

In view of these circumstances, it is an object of the present invention to provide a drilling device that is compact and lightweight, and that allows the drill bit to protrude accurately and perform precise drilling.

Hereinafter, the present invention will be described based on an embodiment shown in the drawings. The figure is a longitudinal cross-sectional view of a main part of a punching device showing an embodiment of the present invention.

In the figure, the drilling device includes two gears 3.4, in which the rotation of an electric motor 1 is transmitted to a drive shaft 2, and two gears 3.4 each having a different number of teeth are provided on the drive shaft 2. 5.6 are driven at different rotation speeds.

Although the shafts 8 of the gears 5.6 are arranged on the same axis, they are configured to rotate independently, and one shaft 8 is configured to be movable in the axial direction, while the other shaft is configured to rotate independently. It is pressed by a spring 9.

Furthermore, one shaft 8 and the other shaft are abutted,
An inclined surface 1o is formed at the abutting portion of the cam, thereby forming a cam.

Further, a pin 11 is fitted to the abutting portion of the shaft 1.8, and the two shafts 8 are held on the same axis.

At the end of the other shaft, there is a thrust metal l! /12 and a thrust receiver 14 with a stopper 13 so as not to rotate is provided and is configured to face the load direction.

The thrust receiver 14 is fitted with an adjustment device 16 that is screwed into the case 1'5 and rotated from the outside to move in the axial direction, and is configured to be movable in the axial direction when the adjustment device 16 is rotated. has been done.

In the case 15, the electric motor 1 becomes the handle 1,
An arm 18 is provided on one side, and a drill 19 is provided with the arm 1 serving as a guide.

The drill 19 is attached to one shaft 8 by a collet chuck 2o, rotated by a gear 6, and a cam by an inclined surface 1o. gear 3
, 4 to gear 5.6 and gear 5.
．． 6 have different numbers of teeth, so they have different rotation speeds.

Since the gears 5.6 rotate at different rotational speeds, the cams formed by the inclined surfaces 1o provided on the shafts and shafts 8, which are rotated by the gears 5.6, respectively, are rotated by the gears 5.6 at the inclined surfaces 10 that abut against each other. It will slide due to the difference in rotation speed.

Therefore, the distance between the shafts 1.8 increases once due to one rotation of sliding, and since the end of the other shaft is supported in the axial direction by the thrust metal 12, one The shaft 8 makes one reciprocation in the axial direction.

Since a key IJ 19 is provided through the end port 1 collection chuck 20 of one of the shafts 8, when the drill 19 reciprocates in the axial direction, it becomes K.

Furthermore, when the adjustment device 16 is rotated, the thrust receiver 14
Since it moves in the axial direction, the shaft can be moved in the axial direction, and the reciprocating position of the drill 19 can be moved in the axial direction.

Such reciprocating movement of the drill bit 19 is performed by a cam mechanism using the inclined surface 10, so that the drill hole 19 can be projected very accurately, and a predetermined depth can be precisely cleared. Because of the sliding motion, it is extremely easy to obtain an accuracy of about 1/10 + W. Even if thin steel plates are overlapped and spot welded, a hole can be reliably drilled in only one steel plate, and the other steel plate cannot be welded. A predetermined purpose can be easily achieved without drilling unnecessary holes or leaving customer marks on one steel plate.

First, if the amount of protrusion of the drill 19 is determined by the amount of protrusion from the arm 18, then it can be used by strongly pressing the arm 1B against the hole to be drilled, or by fixing the arm 18 to the steel plate or the like to be drilled with a jig. A more predetermined amount of protrusion can be utilized.

To measure the amount of protrusion of the drill bit 19, a scale may be configured on the rotation of the adjustment devices 1 (5) to 6, or a hole may be drilled on a trial basis and the depth of the hole may be measured. In this case, adjustment can be easily made by rotating the adjusting device 16, so that it can be adapted to materials such as steel plates of various thicknesses.

The rotational speed of the awl 19 is determined by the rotational speed at which the rotation of the electric motor 1 is transmitted to the gear 6 via the gear 4, and the reciprocating motion of the awl 19 is determined by the difference in the rotational speed between the gears 5 and 6. It turns out.

Therefore, 190 rotations of the drill is a high rotation speed convenient for drilling, and the reciprocating motion of the drill 19 is determined by the difference in the rotation speed of the gear 5.6, so it can be easily selected from an extremely low speed to any high speed. .

In particular, the reciprocating speed of key 1719 needs to be slow compared to the rotation speed, and the rotation speed is generally about 200 or
It is preferable to have a reciprocating movement of t-10 to 100 times/minute.Performing such a function with two gears 5.6 will result in an extremely small, lightweight, and simple configuration for the purpose of training. Effective as a seed device.

(6) When using the end drill, the drill bit 19 is convenient for making a hole in only one of two thin steel plates, and is also useful for removing burrs on the edge of the hole, tapered holes for countersunk screws, etc. Since it is possible to use a drill of a type that is suitable for each type of hole, it can be adapted to various types of drilling, and the same effect can be obtained.

As explained above, according to the present invention, when drilling a hole to a certain depth, it is possible to make a predetermined hole very accurately.
By removing two spot-welded steel plates, it is possible to easily drill holes such as tapers and holes for countersunk screws, and because it can be constructed in a small and lightweight structure, its effectiveness is industrial. The top is extremely large.

[Brief explanation of drawings]

The figure is a longitudinal sectional view of a punching device according to an embodiment of the present invention. 3, number, 5.610. Gear, F, 81. . axis, 100. , Slope, 1600. Adjustment device. 19, 8. Kiri. (tsu)

Claims (1)

[Claims] It is characterized in that gears with different rotational speeds are arranged on the same axis, the axes of both gears abut each other, a cam is formed by an inclined surface at the abutting part of the axes, and a drill is provided on one of the axes. drilling equipment.