JPH08318330A - Device for punching hollow square member - Google Patents

Abstract

PURPOSE: To form a through hole in a high precision by making the rigidity of a first supporting arm lower than the rigidity of a second supporting arm and making the interval between both arms high near the connecting part. CONSTITUTION: A hollow square member guide member 4 and a punch guide 6 are provided on a base table 2. Further, the steel-made first supporting arm 22 extending toward the rear part is provided on the base table 2 and a connecting member for supporting the steel-made second supporting arm 24 is fitted to the rear end thereof. The rigidity of the second supporting arm 24 is high and the hollow square member P can be inserted while keeping straight line state. The first supporting arm 22 has the comparatively low rigidity and is bent into arch-shape, but horizontally and rockingly supports the seconds supporting arm 24 and an inner die 30. Large shock and fastened engagement between a punch 10 and the inner die 30 are prevented by vertically rocking the inner die 30. In this case, the interval between the first supporting arm 22 and the second supporting arm 24 is made large near the connecting part in comparison with near the base table 2. By this method, even in the surface containing the seam connecting part, the through hole having a prescribed shape size can be formed in high precision.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hollow corner member punching device for punching a through hole in a metal hollow corner member used as a base material for a ceiling or a wall of a building.

[0002]

2. Description of the Related Art A hollow corner member used as a base material or the like usually has a length of, for example, 2.5 m, and a through hole for allowing a steadying member to pass through is provided at a central portion in the length direction. The following is disclosed as a conventional technique of a device for providing a through hole in the hollow corner member. Actual Kaihei 4
In Japanese Laid-Open Patent Publication No. 10617, a base stud is provided with a through hole in a hollow corner member, and a thin plate material is bent into a rectangular tube shape, and the through hole is formed at both side edges abutting by bending. It discloses that a mincing cut is provided. In this technology, the side edges that are abutted by bending are not connected by welding or seam processing, and it is difficult to increase the rigidity as a hollow corner member, and holes that are provided on the abutting side edges with high accuracy are desired. However, there is a problem that dangerous burr remains around the through hole. Japanese Utility Model Publication No. 59-106636 and Japanese Utility Model Publication 1-89
Japanese Patent No. 818 discloses a device for punching a hollow member, in which an inner die is disposed inside the hollow member and a punching blade member punches through the inner die.

This technique does not disclose a structure for supporting the inner die. For example, in order to provide a through hole in a long material such as the above-mentioned base material, two long arm members whose ends are connected to each other are used. When the inner die supporting mechanism is used, there is a problem that the inner die is broken when the punching blade member enters or leaves the inner die. That is, if the inner die is firmly supported, it is difficult to align the punch with the inner die.
The inventor has experienced that the punch and the inner die are misaligned with each other as the punching device is used for a long time, and the punch or the inner die is broken when the punch is driven in or pulled back. Therefore, at present, bending a thin plate material into a rectangular tube shape,
Although a highly rigid hollow corner member has been manufactured by welding or seaming both abutting edges, there is no device capable of highly accurately forming a through hole having a desired shape and size.

[0004]

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems of the prior art, and is a hollow hollow corner having a high rigidity obtained by bending a thin plate material into a rectangular tube shape and welding or seaming both side edges to be abutted. An object of the present invention is to provide a hollow corner member punching device capable of highly accurately forming a through hole having a predetermined shape and size in a member or the like.

[0005]

According to the present invention, a base, a hollow corner member guide provided on the base, and a first support arm extending rearward from the base, which is opposite to the side into which the hollow corner member is inserted, are provided. , The first
A second support arm attached to the support arm by a connecting portion and extending forward, an inner die having a punch through hole attached to a front end portion of the second support arm, and arranged above the hollow corner member guide and the inner die. A punch, the rigidity of the first supporting arm is smaller than the rigidity of the second supporting arm, and the distance between the first supporting arm and the second supporting arm is near the connecting portion as compared to near the base. The hollow corner member punching device is characterized by having a large interval.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A hollow corner member punching device according to a first embodiment of the present invention will be described in detail below with reference to the drawings. As shown in FIGS. 1 and 2, the hollow corner member punching device 1 includes a hollow corner member guide member 4 and a pair of punch guides 6 on a base 2. The hollow corner member guide member 4 is, for example, a hollow corner member P that is inserted from the front side of FIG. 1, that is, from the front to the rear, within a permissible range of ± 0.1 mm in the horizontal direction, and ± in the vertical direction.
It slides and guides by movably positioning it within an allowable range of 2.0 mm. The punch guide 6 supports the punch 10 and is driven by a pressing device (not shown).
It slides and guides the vertical reciprocating motion of 2. As shown in FIG. 3, the base 2 has a first steel support arm 22 extending rearward, and a second steel support arm 24 is supported at the rear end of the first support arm 22. A connecting member 26 is attached. The cross section of the first support arm 22 is 32 mm wide and 16 mm thick, and the cross section of the second support arm 22 is 25 mm wide.
mm, thickness 20 mm. The connecting member 26 connects the first support arm 22 and the second support arm 24 so that they are parallel to each other and have a space of, for example, 36 mm. The rigidity of the second support arm 24 is greater than the rigidity of the first support arm 22. The tip portion of the second support arm 24 is substantially inside the hollow corner member guide member 4, and the inner die 30 is attached to the tip portion. First support arm 22
Bends in an arch shape due to the weight of the second support arm 24 and the inner die 30, the second support arm 24 is held substantially horizontally, and the first support arm 22 near the inner die 30.
The distance between the second support arm 24 and the second support arm 24 is about 25 mm.

The inner die 30 is, as shown in FIG.
A seam having a schematic outer shape substantially corresponding to the inner side surface of the hollow corner member P shown by an imaginary line, a die hole 32 through which the punch 10 penetrates is formed in a substantially central portion, and a seam coupling portion S of the inner die 30 is received on the left and right side surfaces. The groove 34 is formed.
The front end of the inner die 30 is chamfered in a tapered shape. The base 2 also has a punch receiving hole 4 for receiving the tip portion of the punch 10 at a portion corresponding to the lower side of the die hole 32.
0 is provided. The second support arm 24 is slidably and fixed by a hollow corner member stopper 50 for regulating the position of the hollow corner member P which is guided by the inner die 30 and covers the outside of the second support arm 24 with respect to the second support arm 24. It is arranged as possible. In the hollow corner member punching device of the first embodiment having the above-described configuration, the distance from one end of the hollow corner member P to the through hole is set by adjusting the position of the hollow corner member stopper 50. Next, while advancing the seam joint S of the predetermined hollow corner member P to the seam groove 34 and covering the inner die 30, the hollow corner member P is advanced until the end of the hollow corner member P is stopped by the hollow corner member stopper 50. Punch 1 in this state
0 is lowered by the force of a flywheel (not shown), and punch 1
The leading end of 0 advances to the upper surface of the hollow corner member P, the die hole 34 of the inner die 30, and the punch receiving hole 40 to form a predetermined through hole in the hollow corner member P. Then, the punch 10 rises and the hollow corner member P is pulled out from the inner die 30.

Hollow corner member punching device 100 of the second embodiment
Is a seam joint S of the hollow corner member P as shown in FIG.
A device for providing a through hole including a surface having
The same components as those in the embodiment are designated by the same reference numerals and the description thereof will be omitted. The inner die 102 has seam grooves 104 formed on the upper surface and the lower surface thereof, and the hollow corner member P is configured such that the seam joint S is located above or below.
2 is engaged. With this configuration, the through hole having a predetermined shape and size can be formed in the seam joint S as well.

[0009]

The hollow corner member punching device 1, 100 having the above-mentioned structure
In the above, the second support arm 24 has a large rigidity and is not elastically deformed, and the hollow corner member P can be easily inserted while maintaining the linear state. On the other hand, the rigidity of the first support arm 22 is relatively small, and the weight of the second support arm 24 and the inner die 30 causes the first support arm 22 to move.
Bends in an arc shape, but supports the second support arm 24 and the inner die 30 so as to be swingable substantially horizontally. Therefore, the first
When the hollow square member P is attached to the support arm 22 and the inner die 30, the inner die 30 can swing up and down by up to 2 mm in the hollow square member guide member 4, and the die hole of the inner die 30 of the punch 10 can be moved. It swings up and down in response to insertion into and removal from 34. It is presumed that the vertical swing of the inner die 30 prevents a large collision and a strong engagement between the punch 10 and the inner die 30, and effectively prevents the punch 10 and the inner die 30 from being broken.

[0010]

According to the present invention, a thin plate material is bent into a rectangular tube shape, and the through-holes of a predetermined shape are formed with high accuracy in a highly rigid hollow corner member or the like in which both abutting edges are welded or seamed. In particular, there is an effect that a through hole having a predetermined shape and dimension can be formed with high accuracy even on the surface including the seam joint.

[Brief description of drawings]

FIG. 1 is a perspective view of a hollow corner member punching device according to a first embodiment of the present invention.

FIG. 2 is a partial vertical sectional view of the hollow corner member punching device according to the first embodiment of the present invention.

FIG. 3 is a side view of the hollow corner member punching device according to the first embodiment of the present invention.

FIG. 4 is a cross-sectional view of the inner die and the hollow corner member of the hollow corner member punching device according to the first embodiment of the present invention.

FIG. 5 is a sectional view of an inner die and a hollow corner member of a hollow corner member punching device according to a second embodiment of the present invention.

[Explanation of symbols]

 P Hollow corner member S Seam joint 1 Hollow corner member punching device 2 Base 4 Hollow corner member guide member 6 Punch guide 10 Punch 12 Punch holder 22 First support arm 24 Second support arm 26 Connection member 30 Inner die 32 Dice hole 34 Seam groove 40 Punch receiving hole 50 Hollow corner member stopper

Claims (6)

[Claims] 1. A base, a hollow corner member guide provided on the base, a first support arm extending rearward from the base opposite to the insertion side of the hollow corner member, and the first support arm. A second support arm attached to the support arm by a connecting portion and extending forward, an inner die having a punch through hole attached to a front end portion of the second support arm, and arranged above the hollow corner member guide and the inner die. A punch, the rigidity of the first supporting arm is smaller than the rigidity of the second supporting arm, and the distance between the first supporting arm and the second supporting arm is near the connecting portion as compared to near the base. A hollow corner member punching device, characterized in that the distance between the two is large. 2. The hollow corner member punching device according to claim 1, wherein the second support arm has a stopper that regulates a length to be inserted into the hollow corner member. 3. The hollow corner member punching device according to claim 1, wherein the inner die has a seam groove for receiving a seam joint portion of the hollow corner member. 4. The hollow corner member punching device according to claim 3, wherein the inner die has a surface having the seam groove as an upper surface and a through hole is provided in a surface having a seam coupling portion of the hollow corner member. . 5. The hollow corner member punching device according to claim 3, wherein the inner die has a surface having the seam groove as a lower surface and a through hole is provided in a surface having a seam coupling portion of the hollow corner member. . 6. The hollow corner member punching according to claim 3, wherein the inner die has a surface having the seam groove as a side surface and a through hole is provided in a surface of the hollow corner member having no seam coupling portion. apparatus.