JP2008012569A - Method of making hole on thin steel sheet or the like - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a method of making a hole on a thin steel sheet corresponding to both different hole making modes for making the hole of a method of making the hole in which a slug is perfectly cut off in shop production of a member such as a duct made of the thin steel sheet or the like and a method of making the hole in which the slug is left in the site for mounting members. <P>SOLUTION: A plurality of shearing edges 7 are protrusively formed on the periphery of the tip of a driver 2 provided so that it can be struck from the main body of a power tool, and the hole is made on an object member by vertically or obliquely striking the driver to the object member 10 of the thin steel sheet or the like. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a drilling method for making a hole in a member made of a thin steel plate or the like such as a duct or a deck.

Explosive gas pressure or fluid pressure of explosives equipped with a shearing part (blade part) inclined to the axis at the tip as a drilling machine (tool) for making a hole in a thin steel plate member such as a duct (For example, see Patent Document 1), and a drilling machine (tool) in which the shape of the shearing portion at the tip of the driver is a V-shaped groove. There is also known one that performs the above-described perforation using (see, for example, Patent Document 2).
Japanese Patent Publication No. 8-4852 Japanese Utility Model Publication No. 58-47500

  By the way, in drilling work at the installation site of members made of thin steel plates such as ducts, dropping and scattering of scraps due to drilling is to be avoided from the viewpoint of ensuring the safety of workers. Occasionally, scraps are left uncut. On the other hand, as a trend accompanying the recent factory production of thin steel plate members, it is required to perform the above-described drilling operation without completely separating the punched residue. For example, when a bolt is passed through a hole in a plate of a duct and a nut is fastened and fixed to the plate from the inside or outside of the hole, the punched residue becomes an obstacle to tightening the nut.

  However, drilling by a driver in a member made of a thin steel plate such as a duct by a drilling machine (tool) described in Patent Document 1 is performed at a shearing portion inclined with respect to the axis of the driver, so Since it is designed to prevent the dropping residue from falling or scattering, it is impossible to make a hole that completely separates the removal residue.

  On the other hand, the drilling technique using a drilling machine (tool) provided with a screwdriver having a shearing portion of a V-shaped groove described in Patent Document 2 is based on the premise that the punching is performed without separating the punched residue. It is not possible to make a hole that remains in a state of being connected to a steel plate without being cut off.

  In view of the desire to develop a drilling machine equipped with a driver that can be used for both drilling operations, the present invention provides a hole that completely cuts off a punched piece during factory production of a member such as a duct made of a thin steel plate. It is an object of the present invention to provide a drilling method that can cope with different drilling modes of both the drilling and the drilling of leaving the punched residue at the installation site of the member.

  In order to solve the above-mentioned problem, the invention according to claim 1 is characterized in that a plurality of shearing blades are formed to protrude at the periphery of the tip of a driver provided so as to be able to be driven out from the power tool body, and the driver is used as a target member such as a thin steel plate. On the other hand, the target member is punched vertically or obliquely to make a hole.

  The invention according to claim 2 is characterized in that, in claim 1, the angle formed by the inner surfaces of the two shearing blades facing each other is about 100 to 140 degrees.

  According to the invention according to claim 1, in the punching machine, the drilling of the metal member by the driver is performed by a plurality of shearing blades at the tip of the driver, and the driver is driven perpendicularly to the plate surface of the target member. Thus, it is possible to separate and punch the punched residue. On the other hand, when the driver is driven obliquely with respect to the plate surface of the target member, the target member is cut by the shearing blade that hits first among the plurality of shearing blades of the driver. And since the cut part is cut into a circular shape in turn, it is turned to the same side as the driving direction, so when the last shearing blade hits, the shearing force on the turned part becomes small and remains as it is. . Therefore, the residue remains in a part of the hole.

  Therefore, there is a need to perform punching that completely separates the punched residue, such as drilling a member in factory production, and in the drilling operation at the installation site of the target member, the punched residue falls or scatters. Depending on the case of performing without removing the scraps, there is a possibility of threatening the safety of other workers, and selective drilling can be performed.

  According to the second aspect of the present invention, the angle formed by the inner surfaces of the two shearing blades facing each other is formed to be about 100 degrees to 140 degrees. Therefore, when the driver is driven obliquely against the target member A moderate turning phenomenon can be generated from the incised portion, so that a scrap can be formed, and when the driver is driven perpendicularly to the target member, the hole is surely opened without generating a scrap due to a sufficient shearing force. Can do.

  In FIG. 1, the symbol A indicates the punching machine of the present invention. This punching machine A has a hole (for example, a hole diameter of 11 mm) for attaching a bolt for reinforcing the duct to a member made of a thin steel plate, for example, a steel plate surface such as a duct having a thickness of about 0.8 mm to 1.2 mm. A nose provided with the tip of a screwdriver 2 driven by a striking mechanism provided in the tool body 1 at the tip of the tool. Although not shown, the striking mechanism is provided so as to be able to protrude and retract from the portion 3, and a piston integrally coupled with the driver 2 is slidably provided in the cylinder and driven by air pressure, combustion gas pressure, etc. Is driven together with the driver 2 so as to protrude from the nose portion 3.

  In addition, 4 is the front-end | tip part of the contact arm which comprises a safety device, and protrudes from the front-end | tip of the nose part 3, and the contact arm was pushed upwards in the figure by pressing the nose part 3 against target members, such as a thin steel plate. On the condition that the trigger 5 operates effectively, the driver 2 is driven out from the tip of the nose portion 3.

  The structure of the driver 2 will be described with reference to FIGS. 2 and 3A and 3B. The driver 2 is integrally coupled with the piston and moves up and down in the tool body 1, and is a cylindrical rod-like body having a predetermined diameter and a predetermined length made of a work material such as steel having high rigidity, and is coupled to the piston at the base portion. A threaded portion 8 is formed, and the tip 6 is processed as a shearing portion for drilling.

  Two shear blades 7 are formed on the peripheral edge of the tip of the driver 2 so as to protrude on opposite sides. The shearing blade 7 is formed on the opposite side of the tip by notching the tip of the driver 2 into a gentle V shape. The angle formed by the inner surfaces of the two shearing blades 7 arranged to face each other is preferably about 120 degrees, but may be ± 20 degrees.

  When punching a thin steel plate as a target member by a punching machine using the driver 2 having the above-described configuration, the driver 2 is driven perpendicularly to the target member depending on the application, or the driver 2 is tilted diagonally. Hit and hit.

  When driving the driver 2 vertically, as shown in FIG. 4A, first, the shearing blade 7 formed high on the opposite sides of the tip of the driver 2 is driven into the target member 10, and this portion is subjected to shearing force. Is cut by. The cut portion is further cut into a circular shape as the shearing blade 7 advances. However, since they are cut from opposite sides, they never turn up. For this reason, when the lowest valley part finally passes through and is punched, the punched residue 11 is completely separated from the target member 10 and is removed.

  On the other hand, when the driver 2 is driven obliquely as shown in FIG. 5B, the target member 10 is cut by the shearing blade 7 that hits first among the two shearing blades 7 of the driver 2. It is. And the cut part is sequentially cut into a circular shape, but at the same time it turns over to the same side as the driving direction, so the other shearing blade 7 hits diagonally, the shearing force against the turned part becomes small, It is pushed into the driver 2 as it is and remains bent. Therefore, the punched residue 11 remains in a part of the opening.

  Thus, since the two shearing blades 7 are formed in the driver 2, when the driver 2 is driven perpendicularly to the target member 10, the shearing blades 7 provided on the opposite side are simultaneously targeted. Since it is cut into the member 10, the turned-up phenomenon of the cut portion does not occur. In addition, when the driver 2 is driven diagonally, one of the shearing blades 7 always strikes the target member 10 first and is cut. Therefore, a turning-up phenomenon occurs, and a scrap 11 is formed.

  Therefore, when a hole is made in the target member 10 in the factory, the bolt is passed, and the nut is tightened at the front and rear of the hole to fix the bolt, so that the punch 11 is not left in the hole. In this case, the hole opening operation may be performed while the driver 2 is vertically applied to the target member 10.

  On the other hand, as in the case of drilling work at the installation site of the target member 10, the fall or scattering of the punched residue 11 may contaminate the work site or threaten the safety of the operator. When processing is performed so as not to separate the punched residue 11, the driver 2 may be driven while being obliquely applied to the target member 10. In this way, it is possible to cope with different drilling modes, ie, a hole that completely separates the punched residue 11 and a hole that leaves the punched residue 11 at the installation site of the member.

  The angle formed by the inner surfaces of the two shearing blades 7 arranged to face each other is about 120 ± 20 degrees. If the angle is less than that, even if the driver 2 is applied obliquely, the cut portion does not sufficiently turn up. Since the shearing blade 7 on the opposite side cuts the target member 10, the opposite side is likely to be cut off. On the other hand, if it is more than that, a sufficient shearing force cannot be obtained when the driver 2 is applied obliquely, resulting in defective pulling.

  Next, FIGS. 5A to 5C and FIG. 6 are other examples of the shape of the tip of the driver 2. On the periphery of the shearing portion 6 of the driver 2, four shearing blades 7 are formed to protrude on the opposite sides at equal intervals. Reference numeral 9 denotes a processed surface by cutting. The angle formed by the inner surfaces of the processing surfaces of the two shearing blades 7 arranged to face each other is set to about 120 degrees (may be ± 20 degrees).

  Also in this case, as in FIGS. 4 (a) and 4 (b), when the driver 2 is hit vertically and driven out, first, the shearing blade 7 that is formed high on the opposite side of the tip of the driver 2 is simultaneously applied to the target member 10. Since it hits the surface of the surface, it is cut without turning up, so that a hole without uncut portion can be formed.

  On the other hand, when the driver 2 is driven obliquely and driven, the target member 10 is cut by the shearing blade 7 that hits first among the four shearing blades 7 of the driver 2. And since it turns from the cut | disconnected part, when the last shearing blade 7 hits, the shearing force with respect to the turned part will become small, and will remain as it is. Therefore, the punched residue 11 remains in a part of the opening.

  Therefore, when it is necessary to perform a hole that completely separates the punched residue 11 as in a member punching operation in factory production, and when the target member 10 is installed at the installation site, the punched residue 11 falls. Depending on the case where the punching 11 is carried out without separating the punched residue 11, it is possible to selectively drill holes.

The external appearance side view which showed a part of punching machine of this invention in the cross section Side view of driver used for drilling of the present invention (A) (b) is the perspective view and side view of the shearing part of the said driver, respectively (A) is an explanatory diagram of a drilling situation when the driver is driven perpendicularly to the target member and (b) is slanted (A) (b) (c) is a side view, a bottom view, and a sectional view on line XX of (b), respectively, of a shearing portion of a driver of another embodiment provided for drilling according to the present invention. The perspective view of the shearing part of the driver

Explanation of symbols

A Drilling machine 2 Driver 6 Shearing section 7 Shearing blade

Claims (2)

  A plurality of shearing blades are formed so as to protrude from the periphery of the tip of the driver provided to be driven out from the power tool main body, and the driver is punched perpendicularly or obliquely to the target member such as a thin steel plate to punch the target member. A drilling method for a thin steel plate or the like.   2. The method for punching a thin steel plate according to claim 1, wherein an angle formed by inner surfaces of the two shearing blades facing each other is about 100 to 140 degrees.

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