JPS5815607A - Drilling device - Google Patents

Abstract

PURPOSE:To remove welds from spot welded articles or the like by sandwiching spot welded steel plates between two arms and projecting a drill from one arm to drill only one steel plate. CONSTITUTION:Two spot welded steel plates 11 are sandwiched between arms 7, 8 and a drill 5 reciprocates at low speed while rotating at high speed. The drill 5 is projected from the arm 8 to drill the steel plate 11. The drill projected by a certain length is retreated by a cam 13 and returned into the arm 8 without extending through the whole steel plate 11. By determining the projecting amount of the drill to drill only one steel plate by a fixed cam 14 is removed the spot welded portion.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to the structure of a drilling device for drilling holes of a certain depth, such as when disassembling steel plates joined by spot welding, such as automobiles.

If steel plates jointed by spot welding come apart, there are two ways to do it: drill through the joint or use force to peel it off.

However, in the former case, the same part cannot be welded because a through hole remains, and in the case of the exterior, it must be blind, and in the latter case, the steel plate will bend and must be corrected.
Both methods had the disadvantage of requiring time and effort.

In view of these circumstances, an object of the present invention is to provide a drilling device that can drill holes of a certain depth, such as by removing spot welds from steel plates of automobiles, etc., while utilizing one steel plate and removing the other steel plate.

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 drilling device according to an embodiment of the present invention.

In the drilling device, the output of the electric motor 1 is connected to a bevel gear 3 loosely fitted to the spindle 2 in the axial direction.

Furthermore, a drill 5 formed by a two-blade end mill is provided at the tip of the spindle 2 via a collet chuck 4.

Further, an armer facing the tip of the drill 5 is fixed to the main body 6, and an arm 8 facing the arm 7 is provided so as to cover the drill 5.

The armer facing the arm 8 is configured to move toward the arm 8 facing the arm 8, and the armer 1 is connected to the lever 1 via the hinge 9.
When 0 is pulled, the rotation of the spindle 2, which is configured to firmly hold the steel plate 11 between the arms 7 and 8, is reduced to about 1/20 to 1/100 by the three-stage reduction gear a%BLC, and the cam It is connected to the shaft 12.

The tip of the cam shaft 12 has a cam 13 formed diagonally.
is provided, and an individual cam 14 that slides on this cam 13 is provided.

Furthermore, the individual cam 14 is configured to be movable in the axial direction and can be fixed at any position with a screw 15.

Further, the rear surface of the cam 13 is configured to press the collar 1'7 of the spindle 2 via a washer 16, and the collar 17 is urged by a spring 18 in the opposite direction to the direction in which the cam 13 is pressed. .

In this configuration, the drilling device rotates the drill 5 by the rotation of the electric motor l, the camshaft 12 is rotated at a low speed by the three-stage reduction gears a% b, c, and the spindle is rotated by the cam 13 and the fixed cam 14. 2 reciprocates in the axial direction.

Therefore, the drill 5 reciprocates at a low speed and rotates at a high speed, and extends between the arm 8 that covers the drill 5 and the arm 7 that opposes the arm 8.

Then, when the two steel plates 11 joined by spot welding are held between the two armers 8 and the awl 5 is rotated,
Since the Kiriya protrudes from the arm 8 toward the steel plate 11 while rotating, a hole is made in the steel plate 11.

However, due to the reciprocating motion of the cam 13, the aperture 5 protrudes by a certain length, then retreats and enters the arm 8, and does not penetrate the entire steel plate 11.

Therefore, if the amount of protrusion of the drill bit 5 is determined by the fixed cam 14, it is possible to drill holes in only one steel plate of the steel plate 11 formed of two steel plates, and the arm 7.8 allows the steel plate 11 to be held firmly in place. The spot welded parts are clamped together,
Holes can be easily machined.

In this way, when a hole is drilled in one of the steel plates of the spot welded portion, the one steel plate with the hole drilled comes off, and the spot weld can be removed.

Furthermore, since no through holes are formed in the other steel plate, the back side in particular remains intact and does not impair its aesthetic appearance, is also advantageous in terms of strength, and does not require maintenance such as hole filling.

Further, the amount of protrusion of the aperture 5 from the arm 8 covering the aperture 5 can be adjusted arbitrarily by adjusting the position of the fixed cam 14. For example, when two steel plates with a thickness of 2 mm are spot welded, Since the steel plate 11 has a diameter of 4ff, the spot weld can be removed by making a hole in only one steel plate by adjusting the 2fl aperture 5 for one plate to protrude.

Such a drill 5 must have a diameter that covers the entire spot welded joint, usually 1
A diameter of 0 to 15 ff is sufficient.

The drill 5 preferably has a flat tip, such as a two-blade end mill, and even if the tip is flat, the arm 8 can firmly clamp the steel plate 11, so the tip of the drill 5 has a flat tip. The holes can be reliably drilled without slipping along the drilling surface of No. 11.

Furthermore, the awl 5 has a protrusion of 2 at approximately 2000 revolutions per minute.
It is convenient if the speed is 0 to 30 times, and if the work does not require extremely fast speed, there will be no problem even if the speed is much slower than this.

In particular, there is no problem even if the ejection speed by the cam 13 of the awl 5 is somewhat slow, but in order to slow the ejection speed, the reduction ratio of the internal reduction mechanism must be increased, and for practical purposes it must be made small and lightweight. Since this type of tool is contrary to the improvement in practicality, it can be said that the practical range is 10 to 60 ejections per minute.

In addition, during use, if the steel plate 11 is clamped between the arm 8 and the arm 8 with the drill 5 protruding from the arm 8, the drill 5 may hit the steel plate 11 from the beginning of starting the motor 1, making it difficult to start. It is preferable to clamp the steel plate 11 with the drill 5 inside the arm 8 and start the electric motor 1 with the drill 5 inside the arm 8.

Of course, it is possible to increase the output of the electric motor 1, but in consideration of practicality due to the reduction in size and weight, it is better to reduce the output of the electric motor 1 to the minimum necessary and use caution when putting it into practical use.

The hole 5 can be drilled by protruding it once, but by protruding it several times, it can reliably cut to a predetermined depth and easily and reliably peel off even spot welding of thin steel plates of 1H or less.

Of course, other than spot welding, it is possible to drill holes to any depth in thin steel plates, which is extremely effective.

As explained above, the present invention is capable of holding a spot-welded steel plate between two arms, having a drill protrude from one arm, drilling a hole in the other steel plate, and removing the spot weld. It is a drilling device, and its reliable and easy operation is extremely effective in industry.

[Brief explanation of the drawing]

The figure is a longitudinal sectional view of a punching device according to an embodiment of the present invention. 1...Electric motor, 2...Spindle, 5...Kill, f, 8...Arm 10...Lever 1
1... Steel plate. Patent applicant: Shibaura Seisakusho Co., Ltd.

Claims (5)

[Claims] (1) A perforating device characterized by being configured so that a plate can be held between two arms, a rotating awl protruding from one arm, and a certain gap remaining between the two arms and the other arm at maximum protrusion. . (2) The drilling device according to claim 1, characterized in that the gap between the drill and the other arm when the drill is extended to its maximum extent can be adjusted. (3) The drilling device according to claim 1 or 2, characterized in that the spindle that rotates the drill is reciprocated by a decelerated cam. (4) The drilling device according to claim 3, characterized in that the ratio between rotation and reciprocation of the drill is set to 100 or less. (5) The drilling device according to claim 1, 2, 3, or 4, wherein the drill bit is formed by a two-blade end mill.