JP2004176327A - Steel door - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To constitute not to cause a welding failure in forming a steel door by welding a pair of front and rear steel plates by laser beam welding. <P>SOLUTION: Bent parts of upper edges out of bent parts formed on at least three sides of four peripheral sides of a pair of front and rear face plates 3 are formed as bent pieces 3d, 4c bent in L-shapes, and these bent pieces 3d, 4c are overlapped in a layered state and welded. The thickness of a door can be adjusted by adjusting the mutual overlap amount of these bent pieces 3d, 4c. Such a defect as to form a clearance between abutting parts of the bent parts at left and right edges, at the upper edges as a matter of course, is eliminated to make welding by laser beam welding positive and firm. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention belongs to the technical field of steel doors provided at openings of buildings such as entrances.
[0002]
[Prior art]
In general, a door provided at the opening of a building such as this kind of entrance has a bent portion formed on at least three sides of a pair of steel plates on the front and back, and these bent portions are integrated by welding to obtain a predetermined door. Steel doors configured to be thick are known. In such steel doors, it has been proposed that the front and back steel plates be integrated by laser beam welding, thereby preventing deformation of the steel plates and ensuring integration without leaving welding marks. (For example, see Patent Document 1).
[0003]
[Patent Document 1]
JP-A-2002-174082
[Problems to be solved by the invention]
By the way, in the prior art, when laser beam welding is performed on the bent portions formed on the peripheral portions of the pair of front and back steel plates, a butt state of the weldable bent portions is presented.
On the other hand, when mass-producing such a steel door, it is necessary to consider a dimensional error when cutting a steel plate and an error when forming a bent portion. On the other hand, the one disclosed in Patent Document 1 does not consider such an error, and in particular, in a case where laser beams are welded between the end faces of the bent portion, a dimensional error occurs. In such a case, the end faces of the bent portion cannot be brought into contact exactly over the entire length. In this case, if the thickness of the steel sheet is large, it is possible to fill the gap by laser beam welding.However, as the thickness of the steel sheet becomes thinner, it is more difficult to fill the gap, and the absorption of dimensional errors is reduced. It is also assumed that it is impossible to do so, and there is a problem that the incidence of defective products increases, and there is a problem to be solved by the present invention.
[0005]
[Means for Solving the Problems]
The present invention has been made in view of the above-described circumstances, and has been created for the purpose of solving these problems. The bent portions are formed on at least three sides of a pair of front and back steel plates, and are opposed to each other. In forming a steel door having a predetermined door thickness by laser beam welding the bent portions, the steel door is bent at an upper edge or a lower edge of the peripheral edge, or at both upper and lower edges. Each of the portions is formed into an L-shaped portion having an L-shape, and these L-shaped portions are stacked so that the door thickness can be adjusted.
By doing so, it is possible to perform welding in a state where the door thickness direction can be adjusted, and it is possible to prevent a gap from being formed at the abutting portion between the bent portions at the left and right edges, and to perform laser beam welding. Welding can be performed reliably and firmly, and the occurrence of defective products can be reduced when mass-producing steel doors.
In this case, the left and right edges of the steel door of the present invention are formed by welding abutting portions between a plate surface of a bent portion of one steel plate and an end surface of a bent portion of the other steel plate. By doing so, it is possible to make adjustments in the left-right direction in addition to the adjustment in the door thickness direction, making welding more reliable and robust, and improving product reliability. Can be improved.
Further, in this case, one of the bent portions of the steel plate facing the front and back of the present invention is formed in an L-shaped portion having an L shape, and the other is formed in a folded portion having a folded shape. It can be configured so that it can be brought into contact with the plate surface of the folded portion so as to be able to adjust the door width, and the welding is reliably and firmly performed, and the reliability of the product can be improved.
In this case, the bent portion at one edge of the front steel plate of the present invention is formed into an L-shaped portion, and the bent portion at the other edge is formed as a folded portion, and the bent portion at one edge of the back steel plate is formed. The bent portion at the other edge is formed into an L-shaped portion, and the edge of the L-shaped portion protrudes from the plate surface of the folded portion so that the door width can be adjusted. It can be configured so as to be applied, and the welding is assured and firm, and the reliability of the product can be improved.
[0006]
BEST MODE FOR CARRYING OUT THE INVENTION
Next, an embodiment of the present invention will be described with reference to FIGS.
In the drawings, reference numeral 1 denotes a pair of left and right (parent and child) steel doors which are attached to an opening of a building in a double-opening (opening and closing swinging) manner, and a main door 2 which constitutes one of the steel doors 1. Is constituted by using a pair of front and back (front and rear) face plates (corresponding to the steel plate of the present invention) 3, 4 made of a metal material. The front and back plates 3 and 4 are each made of a rectangular metal plate (steel plate), and bent portions are formed at the left and right edges and the upper edge of the front and back plates 3 and 4, respectively. The opposing bent portions are configured as described below, and are welded (welded (integrated)) by laser beams, respectively, so that doors formed by the bent portions between the front and back plates 3 and 4 are formed. The main door 2 having a thickness (a prospective surface) is formed.
[0007]
Reference numeral 5 denotes an elongated aggregate (functioning as a so-called middle bone) which is formed by bending a metal plate into a substantially rectangular shape in cross section. A plurality of (four in the present embodiment) are provided at predetermined intervals in the width direction and extend in the up-down direction, and are provided at the lower edge in a state extending in the left-right direction. These aggregates 5 are integrated by a double-sided tape 6 interposed between the pair of front and rear leg pieces 5a and 5b and the front and back plates 3 and 4. Incidentally, as means for fixing the aggregate 5 to the front and back plates 3 and 4, one leg piece 5 a and the back plate 4 are welded by a laser beam (a yag laser in the present embodiment), and the other leg piece is used. 5 b and the surface plate 3 can be integrated by a double-sided tape 6.
The main door 2 has a handle 7 on one side edge and a hinge 8 disposed at a plurality of positions in the vertical direction for connection with the frame on the other side edge (edge on the hanging side). Necessary members such as a door closer (not shown) are attached.
[0008]
Now, the integration of the front and back plates 3 and 4 at the left edge of the main door 2 is performed as follows.
First, the bent portion formed on the left edge portion of the front surface plate 3 has a front end facing the right edge side, and is folded in a folded state in a state of being in contact with the back surface of the front surface plate 3 ( 3a), while the bent portion formed on the left edge of the back plate 4 has a substantially L-shape whose front end is bent toward the front plate 3 side. It is formed on a bent piece 4a (corresponding to the L-shaped portion of the present invention). Then, the plate end surface, which is the distal end surface of the back surface side bent piece 4a, is abutted against the plate surface (back surface) of the front side bent piece 3a, and a torch (about 45 degrees) is inclined with respect to the abutting portion. (Not shown) by laser beam welding, and the door thickness of the main door 2 on the left edge side is set based on the length dimension of the back side bent piece 4a. At this time, the plate end surface of the back surface side bent portion 4a is located inside the folded end portion (left edge portion) of the front surface side bent piece 3a and is abutted, whereby the bent piece 3a is bent. The folded part side is formed in a door stop part 2a protruding toward the child door 9 side.
[0009]
On the other hand, the bent portion formed on the right edge portion of the surface plate 3 is folded in a folded shape (returned) in a state where the tip is directed to the left edge side and there is a predetermined gap between the bent portion and the surface plate 3. And a second bent piece 3c facing the back plate 4 and forming the door thickness, and a second bent piece 3c facing the left edge. The bent portion formed on the right edge of the back plate 4 is formed in a bent piece (L-shaped portion) 4b bent in a substantially L-shape with the front end facing the surface plate 3 side. Have been. Then, the plate end surface, which is the tip end surface of the back surface side bent piece 4b, abuts against the plate surface (back surface) of the second bent piece 3c of the front side bent portion, and is approximately 45 degrees with respect to the abutting portion. The unit is integrated by laser beam welding using a torch (not shown) oriented in an inclined direction. The door thickness of the main door 2 on the right edge side is determined by the back side bent piece 4b and the front side first folded part. The length is set based on the length of the piece 3b.
[0010]
Further, the bent portion formed on the upper edge portion of the front surface plate 3 is formed into a bent piece (corresponding to an L-shaped portion) 3d which is bent in a substantially L-shape with the front end facing the back plate 4 side. On the other hand, the bent portion formed on the upper edge of the back plate 4 is a bent piece (corresponding to an L-shaped portion) bent in a substantially L-shape with the front end facing the front plate 3 side. ) 4c. The two bent pieces 3d and 4c are in a state where the plate faces are stacked, that is, in this embodiment, the lower plate face of the front side bent piece 3d and the upper plate of the back side bent piece 4c. The two parts are overlapped in a state where they come into contact with each other, and laser beam welding is performed on the overlapped part using a torch (not shown) oriented in a direction perpendicular to the two plate surfaces, thereby achieving integration. The door thickness of the main door 2 on the right edge side is set based on the front surface side first bent piece 3d and the rear surface side bent piece 4c.
[0011]
The lower edges of the front and back plates 3 and 4 are kept in a cut state, and the aggregate 5 is a double-sided tape 6 between which the leg pieces 5a and 5b and the face plates 4 and 3 are interposed. The door thickness at the lower edge is set based on the length dimension of the bottom piece 5c, which is the gap between the two leg pieces 5a and 5b of the aggregate 5. .
[0012]
In the process of manufacturing the front and back plates 3 and 4 and the aggregate 5, the dimensional error in each of the cutting and bending processes is different from the dimensional error in the left-right direction (door width direction). It is set so that absorption can be achieved by adjusting the abutting positions of the plate end surfaces of the left and right bent pieces 4a and 4b of the back plate 4 with respect to the plate surfaces of the wide bent piece 3a and the second bent piece 3c. . The dimensional error in the front-rear direction (door thickness direction) is set so as to be absorbed by adjusting the overlapping amount of the bent pieces 3d and 4c at the upper edges of the front and back plates 3 and 4. Thereby, for example, even if there is a dimensional error between the bent portions at the left and right edges, this can be absorbed by adjusting the amount of overlap with the bent pieces 3d and 4c at the upper edge. In addition, a gap is not formed at the butting portion of the bent portions at the left and right edges as well as at the upper edge. The error in the vertical direction (door height direction) has no problem in assembling because the lower edge is cut off, and no adjustment mechanism is provided.
[0013]
On the other hand, the child door 9 is set using a pair of front and back face plates (steel plates) 10 and 11 made of a metal plate material, and the right and left edges of the front and back plates 10 and 11 constituting the child door 9 are set. The bent part formed in the part is configured as follows.
In other words, the bent portions at the left and right edges of the front and back plates 10 and 11 constituting the child door 9 are such that, for the left bent portion of the front plate 10, the front ends face the right edge side, and A first bent piece 10a facing the back plate 11 and constituting a door thickness and a second bent piece 10b facing the left edge side are folded in a folded state with a predetermined gap therebetween. The right bent portion is formed as a substantially L-shaped bent piece 10c bent toward the back plate 11 side. Further, the left bent portion of the back plate 11 is configured as a substantially L-shaped bent piece 11a bent toward the front plate 10, and the right bent portion has a tip on the left edge side. The first bent piece 11b is folded in a folded state with a predetermined gap between the first bent piece 11b facing the front plate 10 and the right edge portion side. , And a second bent piece 10c facing the second bent piece 10c.
[0014]
The upper and lower edges of the front and back plates 10 and 11 are the same as those of the main door 2. The upper bent portion is formed in L-shaped bent pieces 10d and 11d, while the lower edge is cut open. Is configured.
The front and back plates 10 and 11 are bonded to the plurality of aggregates 5 arranged vertically between them and the aggregates 5 arranged below and left and right by double-sided tape 6. The left and right edges and the upper edge are opposed to each other, and the right edge between the plate surface of the front side second bent piece 10b and the plate end face of the rear side bent piece 11a at the left edge is provided. Between the plate surface of the second bent piece 11c on the back side and the end face of the bent piece 10c on the front side, and between the plate faces of the bent pieces 10d and 11d at the upper edge portion, with the parent door 2 Similarly, the child door 9 is formed by being integrated by laser beam welding. At this time, an error in the left-right direction (door width direction) is caused by an L-shaped bent piece 10c, 11a with respect to the plate face of the second bent piece 10b, 11c having a width in the left-right direction of the front and back plates 10, 11. It is absorbed by adjusting the abutting position of the plate end face, and the error in the front-back direction (door thickness direction) adjusts the overlapping amount of the bent pieces 10d, 11d at the upper edges of the front and back plates 10, 11. It is set so that it can be absorbed. The error in the vertical direction (door height direction) is similar to that of the main door 2 because no problem occurs in assembling because the lower edge is cut off. Further, in the child door 9, the integrated portion of the right edge of the front plate 10 with the back plate 11 is stepped with respect to the front plate 10, but the child door 9 is closed together with the main door 2. At this time, the step portion 9a is set so as to face the door stop portion 2a of the main door 2.
[0015]
In the embodiment of the present invention configured as described above, the parent door 2 and the child door 9 are formed with bent portions at the left and right edges and the upper edge of the front and back plates 3, 4, 10, and 11, respectively. These bent portions are integrated by laser beam welding to form a steel door 1 having a door thickness. In this case, the parent door 2 and the child door 9 are laser beam welded, thereby eliminating the need for reinforcement such as providing an aggregate at the peripheral edge and eliminating post-processing of welding marks. Although it is configured to be high, the dimensional error in the left-right direction can be absorbed by the configuration in which the plate end surface of the bent portion abuts against the plate surface of the long bent portion in the left-right direction, Further, the dimensional error in the front-rear direction (door thickness direction) can be absorbed by adjusting the overlapping amount of the plate portions of the bent portions. As a result, even if a dimensional error occurs in the process of cutting and bending each of the face plates 3, 4, 10, 11 and the aggregate 5, the front and back plates 3, 4, 10, and 11 are pushed. The error can be absorbed at the stage of joining, and there is no problem that a gap is formed in the welded portion of the double-sided plates 3, 4, 10 and 11, and the joint portion of the bent portion. Since the welding can be performed, the welding is reliably and firmly performed, and the occurrence of defective products can be reduced even when the steel door 1 is mass-produced.
In addition, in this case, since the welding configuration in which the door thickness can be adjusted is made at the upper edge, a dimensional error in the door thickness direction that occurs between the right and left edges of the front and back plates 3, 4, or 10, 11 is reduced. It can be absorbed by adjusting the amount of overlap with the bent pieces 3d, 4c or 10d, 11d at the edges.
[0016]
Furthermore, in the embodiment in which the present invention is embodied, in addition to the adjustment in the door thickness direction, the adjustment is also possible in the left-right width direction, and dimensional errors in both directions can be absorbed. The butting condition of 10 and 11 is good in each direction, and laser beam welding can be performed in the good butting condition, so that more excellent products can be reliably mass-produced.
[0017]
Incidentally, the present invention is not limited to the first embodiment, of course, the bent portion is an L-shaped portion, and these L-shaped portions are overlapped in a laminated shape and a portion to be laser beam welded. Instead of the upper edge of the steel door as in the first embodiment, the lower edge may be laminated as an L-shaped portion. In this case, the upper edge is cut off. It is good also as a shape. In addition, bent portions are provided on the four circumferences of the steel plate, and these four bent portions are laser-beam welded. The upper and lower edges are formed into L-shaped portions so as to be adjustable in the door thickness direction. The upper and lower edges may be formed by laser beam welding. In any case, these welded portions (integrated portions) are located on the upper and lower end surfaces and are in a blind state. There is nothing worse.
[0018]
Further, the bent portions of the front and back plates may be as shown in FIG.
That is, in the second embodiment shown in FIG. 6A, the L-shaped bent piece 12a is formed on the back plate 12 side, and the first and second bent pieces 13a are formed on the front plate 13 side. , 13b are formed, and the plate end face of the second bent piece 13b is abutted against the plate face of the L-shaped bent piece 12a to perform laser beam welding. It is. In this case, as in the case of welding the left and right edges of the first embodiment, the laser beam is applied by applying a torch from an arrow direction inclined at approximately 45 degrees to the abutting direction of the plate end surface with respect to the plate surface. Since welding is performed, this shape has an advantage that positioning by a sensor at the time of welding is easy, automatic welding is possible, and further, there is an advantage that adjustment in a door thickness direction is possible.
[0019]
In the third embodiment shown in FIG. 6B, first, second, and third bent pieces 14a, 14b, and 14c are provided on the surface plate 14 side so as to be substantially U-shaped. A bent portion is formed, an L-shaped bent piece 15a is formed on the back plate 15 side, and the plate end surface of the third bent piece 14c is abutted against the plate surface of the back plate 15, and the abutting portion is formed. The laser beam welding is performed by hitting the torch from the direction of the arrow inclined at approximately 45 degrees to the laser beam. Also in this shape, there is an advantage that positioning by a sensor is easy and automatic welding is possible, and an advantage that adjustment in a door thickness direction is possible.
[0020]
Further, the welded form of the bent portion in the fourth and fifth embodiments shown in FIGS. 6C and 6D is the same as the bent portion at the upper edge of the first embodiment. Thus, the L-shaped bent pieces 16a, 17a of the front and back plates 16, 17 can be adjusted in the door thickness direction by overlapping and welding each other in a stacked manner. In this case, As shown by the arrow in FIG. 6C, one of the plate ends is inclined approximately 45 degrees and the torch is butt-butted for welding, and as shown by the arrow in FIG. There is a case where a torch is abutted orthogonally to the plate surface to perform welding, and in the case of automatic welding, it is difficult to sense the welding position in the case of FIG. 6 (C). It can be said that welding in this way is more effective. When welding two plate surfaces in a direction orthogonal to each other, it is necessary to appropriately adjust the output of the laser beam.
[Brief description of the drawings]
FIG. 1 is a front view of a main door.
FIG. 2 is a cross-sectional view of the main door.
FIG. 3 is a vertical sectional view of a parent door and a child door.
FIG. 4 is a front view of the child door.
FIG. 5 is a cross-sectional view of the child door.
FIGS. 6A, 6B, 6C, and 6D are cross-sectional views illustrating second, third, fourth, and fifth embodiments, respectively.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Steel door 2 Main door 3 Surface plate 3a Bending piece 3b First bending piece 3c Second bending piece 4 Back plate 5 Aggregate material 6 Double-sided tape 9 Child door 10 Surface plate 10a First bending piece 10b Second Folded piece 10c Folded piece 11 Back plate

Claims (4)

A bent portion is formed on at least three sides of a pair of steel plates on the front and back sides, and the bent portions facing each other are laser beam-welded to form a steel door having a predetermined door thickness. The upper edge portion or the lower edge portion of the peripheral edge portion, or the bent portions of the upper and lower edge portions are respectively formed into L-shaped L-shaped portions, and these L-shaped portions are laminated so that the door thickness can be adjusted. Steel door made up. In claim 1, both left and right edges of the steel door are formed by welding abutting portions of a plate surface of a bent portion of one steel plate and an end surface of a bent portion of the other steel plate. Steel door. In Claim 2, one of the bent portions of the steel plate facing the front and back is formed as an L-shaped portion having an L shape, and the other is formed as a folded portion having a folded shape. A steel door that is configured so that it can be abutted against the surface so that the door width can be adjusted. In claim 2 or 3, the bent portion at one edge of the front steel plate is formed into an L-shaped portion, the bent portion at the other edge is formed as a folded portion, and the bent portion at one edge of the back steel plate is formed as a folded portion. The folded portion at the other edge is formed in an L-shaped portion on the folded portion, and the edge of each edge is abutted against the plate surface of the folded portion with the door width adjustable. Steel door that is configured as:

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