JP2002174082A - Steel-made door and its manufacturing method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a steel-made door and its manufacturing method capable of reducing the number of components of the steel-made door to reduce weight and, at the same time, simplifying a manufacturing process. SOLUTION: The steel-made door is so constituted that the integration of inside and outside face plates 2 and 3 and aggregate 4 are welded by a laser beam and that the front end sections of folded piece sections 2a, 2b, 2c, 3a, 3b and 3c are welded to each other over the length to omit force aggregate.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention belongs to the technical field of a steel door provided at an opening of a building or the like and a method of manufacturing the same.

[0002]

2. Description of the Related Art Generally, there is a steel door made of this kind of metal material which is integrated with an aggregate between the front and back plates. Conventionally, a method using arc welding is known. By the way, the welding method by arc welding involves melting and joining metal parts in a high temperature state to each other, so that there is a problem that distortion or twisting is inevitably generated on the plate surface near the joint. Therefore, when joining long objects like the case where the steel doors are integrated by arc welding, welding is not performed over the entire length of the joints but with a predetermined gap. (Spot welding) is performed so as to minimize distortion and twist generated around the joint.

[0003]

However, in the case where the steel door is formed by using the conventional arc welding, a spot-like welding is used to reduce distortion and torsion. Depending on the skill level, the door surface may still be distorted or twisted. 7 and 8
As shown in the figure, bent pieces 2a, 2b, 2c, 3a, 3b, 3c are formed on the four peripheral edges of the front and back plates 2, 3, and these bent pieces 2a, 2b, 2c, 3a, 3b, 3c comrades are integrated into a butt shape to make a steel door (conventional door described later)
In the case where D ′ is formed, the bent pieces 2a, 2a
b, 2c, 3a, 3b, and 3c must be joined by spot welding at predetermined intervals to avoid distortion and twisting due to arc welding. For this reason, the bent piece 2
a, 2b, 2c, 3a, 3b, 3c, the joint strength between them cannot be sufficiently secured.
A force bone 10 having a substantially U-shaped cross section is interposed as a reinforcing material at the portions c, 3a, 3b, and 3c, thereby strengthening the integration of the front and back plates 2, 3. There is a problem that the welding operation is troublesome and difficult, and that the steel door D 'itself becomes heavy. In addition, when performing arc welding, beads are formed in the welded portion and spatters are scattered, so post-processing such as polishing the welded portion and repairing putty is required, and the number of working steps increases, and The problem of inferiority cannot be avoided, and these have problems to be solved by the present invention. Furthermore, in the case where the aggregate interposed between the front and back plates is integrated by arc welding, distortion and torsion occur in the face plate in the process of welding the aggregate to one face plate. In order to cope with this, conventionally, the number of aggregates is increased. However, in this case, problems such as an increase in the number of parts and an increase in weight of the steel door are caused. In addition, when the aggregate is arc-welded in this manner, welding marks are formed on the surface opposite to the welded portion, that is, the surface exposed to the outside of the steel door, and polishing for making the welding marks inconspicuous is performed. However, there is a problem that post-processing such as putty repair is separately required, and the number of working steps is further increased, and these have a problem to be solved by the present invention.

[0004]

SUMMARY OF THE INVENTION In view of the above circumstances, the present invention has been made to solve these problems, and an aggregate is interposed between a pair of front and back face plates. A steel door, wherein the steel door is brought into contact with the peripheral portion of one face plate and the peripheral portion of the other face plate, and the contact portion is welded over the entire length by laser beam welding,
This eliminates the need for reinforcing the aggregate at the periphery. By doing so, the number of parts of the steel door can be reduced, and the weight can be reduced. In this device, a prospective surface portion serving as a prospective surface is bent at the peripheral portion of one face plate of the present invention, and the leading edge portion of the prospective surface portion and the peripheral edge portion of the other faceplate are in contact with each other. can do. Further, in this case, a prospective surface portion serving as a prospective surface is welded over the entire length by laser beam welding to a peripheral portion of one face plate of the present invention, and a leading edge portion of the prospective surface portion and a peripheral edge portion of the other faceplate are joined together. It can be abutted. In this case, one side plate of the present invention may have one side surface of the aggregate welded by laser beam welding. Further, according to the present invention, after welding one side surface of the aggregate by laser beam welding to a portion other than the peripheral portion of one face plate, the other face plate is covered on the other side surface of the aggregate, and thereafter, the one face plate is The peripheral part of the other face plate is brought into contact with the peripheral part side, and the corresponding contact part is welded over the entire length by laser beam welding,
This eliminates the need for peripheral aggregates. By doing so, the manufacturing operation of the steel door can be simplified.

[0005]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, a first embodiment of the present invention will be described with reference to FIGS. In the drawings, reference numeral 1 denotes a steel door which is attached to an opening of a building so as to be capable of opening and closing and swinging. The steel door 1 is constituted by a pair of front and back face plates 2 and 3 made of metal. The front and back plate 2,
3 is made of a rectangular metal plate,
The left and right edges and the upper edge of the front and back plates 2 and 3 are bent in an L-shape to form bent surfaces 2a that form a surface perpendicular to the plate surfaces of the front and back plates 2 and 3; 2b, 2c, 3a, 3b,
3c are respectively formed. Then, these bent pieces 2a, 2b, 2c, 3a, 3b, 3c are brought into contact with each other in an abutting manner, and the abutted end faces are welded by a laser beam as described later. The steel door 1 is set so as to form an expected surface in the door thickness direction (front-back direction).

Reference numeral 4 denotes a long aggregate (an aggregate that functions as a middle bone) formed by bending a metal plate into a cross-sectional shape.
A plurality (three in this embodiment) of the aggregates 4 are arranged in the left-right width direction in a state of extending vertically between the front and back plates 2 and 3. Each of these aggregates 4 has one leg 4
a is integrated beforehand by welding with a laser beam (a yag laser in the present embodiment) between the back plate 3 and the other leg piece 4b is covered by the back plate 3 to which the aggregate 4 is attached. It is integrated via a double-sided tape 5 between the surface plate 2 to be mounted. A lower frame member 6 having a U-shaped cross section for reinforcement is interposed between the front and back plates 2 and 3 at the lower edge of the steel door 1 of the present embodiment. Is provided not to reinforce the bonding of the front and back plates 2 and 3 but to prevent deformation of the face plate because it is a portion where a large force is likely to be applied during use. Reinforcing liner members 8 are welded to the door closers, hinges (both not shown), and grips 7 by laser beam welding.

Next, a procedure for assembling the steel door 1 will be described. Here, when welding with a laser beam, the welding site does not become hot, the radiation range of the laser beam is small, spatter does not scatter, almost no beads are generated, and welding between different materials, for example, welding steel and stainless steel There are features such as being possible. Thus, in the present embodiment, the steel door 1 is formed by making full use of the above-described features, and distortion or twisting due to welding occurs in the member to be welded, such as that formed by arc welding. As a result, the amount of aggregate can be reduced, the strength of the peripheral edge can be omitted, and post-processing such as polishing work after welding and putty repair work can be eliminated. still,
In this embodiment, YA is used as a laser beam emitting means.
The welding operation is performed using a G (yag) laser, and the welded portions are indicated by W.

First, a metal plate material to be the front and back plates 2 and 3 is cut into a predetermined size, and left and right edges and an upper edge portion of these plate materials are subjected to a bending process to form bent pieces 2a, 2b, 2c, 3a and 3a.
b and 3c are formed. Next, three aggregates 4 having a U-shaped cross section are arranged side by side on the back plate 3, and the outer surface of one leg 4 a of the aggregate 4 is placed at a predetermined position on the inner surface of the back plate 3. Abutting and welding by a laser beam are performed from the inner surface of the leg piece 4a. Incidentally, the welding of the aggregate 4 to the back plate 3 is performed by spot welding in the present embodiment. In this case, the welding of the aggregate is performed by a laser beam. Even if it is welded to the back plate 3, the back plate 3 will not be distorted and twisted, and no welding marks will remain on the exposed surface of the back plate 3. This is also possible. .

By the way, the aggregate 4 is interposed between the front and back plates 2 and 3 so that the steel plates can be used when the steel door is used.
And reinforcement, as well as restricting distortion and bending,
When the aggregate 4 is welded by arc welding, distortion and twist are caused by the welding. For this reason, conventionally, the number of the aggregates 4 interposed between the double-sided plates 2 and 3 is increased to prevent the back plate 3 from being distorted or twisted at the forming stage. 4 is welded to the back plate 3 by spot welding using a laser beam, so that there is almost no effect of the plate surface shape on the back plate 3, and the aggregate 4 is not affected by distortion or bending in the process of using the steel door 1. It is only necessary to provide enough strength to endure, and in the present embodiment, three aggregates 4 are provided.

Subsequently, a double-sided tape 5 is adhered to the other leg piece 4b of the aggregate 4 welded to the back plate 3, and
Is mounted so that the end faces of the bent pieces 2a, 2b, 2c, 3a, 3b, 3c abut against each other. Then, the double-sided tape 5 adhered to the aggregate 4 is adhered to the surface plate 2, and each of the bent pieces 2a, 2b, 2c, 3a,
Welding is performed at the contact portions of the end faces 3b and 3c.
The welding is performed on each bent piece portion 2a, 2b, 2c, 3a, 3b,
This can be carried out with high precision by performing the process with the double-sided boards 2 and 3 sandwiched by using a jig or the like so that the end faces of 3c are brought into close contact with each other. At this time, the welding of these end faces is performed over the entire length, but since the welding is performed by a laser beam, the bent pieces 2a, 2b, 2
There is no occurrence of distortion or twist on the plate surfaces of c, 3a, 3b, and 3c. As described above, in the present embodiment, the end faces of the bent pieces 2a, 2b, 2c, 3a, 3b, and 3c are welded over the entire length, so that the connection strength of the end faces is secured. This eliminates the necessity of a conventional U-shaped aggregate (force bone) provided to be applied to the bent piece portions 2a, 2b, 2c, 3a, 3b, 3c as in the conventional case.

The lower frame member 6 and the reinforcing liner members 8 are assembled by integrating the front and back plates 2 and 3 and then applying them to appropriate locations and performing welding using a laser beam. The steel door 1 is integrally formed by welding with a laser beam.

Next, distortion of the steel door 1 (hereinafter, referred to as a new type door 1) formed according to the present embodiment,
Regarding the state of torsion, the above-mentioned conventional steel door D ′ formed by conventional arc welding (the door shown in FIGS. 4A, 7 and 8, and hereinafter referred to as conventional door D ′)
The results examined in comparison with are described. The conventional door D ′ is provided with four aggregates as the middle bones 9 arranged side by side in the left-right direction between the front and back plates 2 and 3, one more than the new type door 1. In addition, aggregates serving as power bones 10 are arranged on the four peripheral edges, and the members are integrated by arc welding. The distortion and torsion of the new and conventional doors 1 and D 'are determined by placing the doors 1 and D' on a horizontal base with the surface plate 2 facing upward. When a reference rule held horizontally on the top is brought into contact with an appropriate position, a gap formed between the reference rule and the surface plate 2 can be analyzed by numerical values measured with a gap gauge. As shown in FIG. 5, the reference ruler is applied to each of the points A, B, C, D, and E (shown by solid lines) facing in the left-right direction, and a gap formed between the reference ruler and the surface plate 2 is defined as: Measurement lines of I, II, III, IV, and V (shown by broken lines, I is a region 50 mm inward from the right end, II is a region on aggregate (medium bone), and III is a medium Use the gap gauge at the intersection with the part in between, IV is the part near the middle bone, and V is the part 50 mm inside from the left end. Measurements Te, and thereby examine the distortion in the lateral direction of the door 1, D '. The results of the above measurement are shown in the table of FIG. 5, and the unit of these numerical values is millimeter (mm).
It is.

According to the table shown in FIG. 5, which door 1,
D 'also has a slight gap at the center in the left-right direction, that is, the center is slightly dented. The numerical value indicating the degree of the dent is larger for the conventional door D ', and most of them are larger than 1 mm. Furthermore, the area where the gap exceeds 1 mm is
It can be seen that the conventional door D 'has a wider range than the new door 1, and therefore, it can be said that the new door 1 hardly generates lateral distortion during the welding process. Further, the middle bone 9 of the conventional door D 'is provided one more than the aggregate 4 of the new door 1, and the fact that consideration has been given to reducing the distortion and torsion of the face plate 2 has been taken into account. The mold door 1 can reduce the lateral distortion of the surface plate 2 even if the number of aggregates 4 is reduced. Therefore, the welding by the laser beam, which is the welding means of the new mold door 1, can be performed. It can be seen that the face plate is hardly deformed. In addition, with respect to each door 1, D ', the plate surface state in the vertical (vertical) direction and the plate surface state in the diagonal direction were compared and examined in the same manner as the above-described plate surface state in the vertical direction. The results of the examination are substantially the same measured values for the new door 1 and the conventional door D ′, and the numerical values are relatively small, indicating a state where slight distortion or twisting occurs. This proves that the new door 1 is an excellent product with almost no distortion or twist on the plate surface.

In the embodiment of the present invention configured as described above, the steel door 1 is formed integrally with the aggregate 4 interposed between the front and back plates 2, 3. As a means of welding, welding by a laser beam is performed. As described above, as a result of the welding by the laser beam, the shape deformation of the double-sided plates 2 and 3 can be almost eliminated, and the number of aggregates 4 incorporated in the rear plate 3 can be reduced. Moreover, bent pieces 2a, 2b, 2c, 3a, 3b formed on the left and right edges and the upper edge of the front and back plates 2, 3 are provided.
Since the abutting portions of the 3c members are welded over the entire length by a laser beam, a force bone is provided at the peripheral portion of the double-sided plate, as in a conventional spot welding by arc welding. There is no need to reinforce, and the power bone of the steel door 1 can be omitted. As a result, the number of parts of the steel door 1 can be reduced, the weight can be reduced, and the manufacturing operation can be simplified. In addition, since this is a configuration in which welding is performed by a laser beam, almost no welding marks are generated at the joining portion. As a result, welding marks exposed to the outside are polished and putty repaired as in the case of arc welding. And other post-processing steps can be eliminated, greatly reducing the number of work steps.
It can also contribute to cost reduction.

The present invention is, of course, not limited to the above-described embodiment, and the aggregate interposed between the front and back plates is not integrated by welding, but is bonded by a double-sided tape or an adhesive. Any integration means, such as bonding by using, for example, may be used. 6A, 6B and 6C.
Steel doors 11, 12, like the third and fourth embodiments,
It can also be 13. Steel door 11 of FIG.
Is configured such that the bent pieces 14a, 15a formed on the peripheral edges of the front and back plates 14, 15 are brought into contact with each other in a superposed manner on the door thickness direction surface and welded. FIG.
(B) The steel door 12 is formed by bending a prospective surface 16a, which is a surface in the door thickness direction, on the peripheral edge of the back plate 16, and forming a bendable front edge 16b on the distal end of the prospective surface 16a. A folded piece 17a formed on the peripheral edge of the surface plate 17 is abutted in a superposed manner on the surface side, and the corresponding contact portion is welded. Further, the steel door 13 shown in FIG.
Is welded to the peripheral edge of the back plate 18 by abutting and welding a bent piece 19a formed by bending one end edge of a prospective surface portion 19 which is a door thickness direction surface. The peripheral portion of the surface plate 20 is brought into contact with the bent piece 19a bent at the edge in a superposed manner, and the corresponding contact portion is welded. In any of the above configurations, the contact portion is welded by a laser beam over the entire length, so that a strong bone can be omitted.
Furthermore, although the lower end of the steel door of the first embodiment has a different configuration from the left and right edges and the upper edge, the steel door has the same configuration as the other peripheral portions. It is also possible to provide a steel door in which the present invention is implemented in all four turns.

[Brief description of the drawings]

FIG. 1 is an overall front view of a steel door.

FIGS. 2A and 2B are a cross-sectional view taken along line XX and a line YY of FIG. 1, respectively.

FIG. 3 is a sectional view taken along the line ZZ of FIG. 1;

FIGS. 4A and 4B are front views of a conventional door and a new door, respectively, illustrating a measurement state of plate surface distortion;

FIG. 5 is a table showing measured values of a gap gauge for measuring distortion of a steel door.

FIGS. 6A, 6B, and 6C are cross-sectional views of main parts of the second embodiment, cross-sectional views of main parts of the third embodiment, and FIGS. It is principal part sectional drawing.

FIG. 7 is a front view of a conventional door.

8A and 8B are a cross-sectional view taken along line XX and a line YY of FIG. 7, respectively.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Steel door (new type door) 2 Front plate 2a Folding piece 3 Back plate 3b Folding piece 4 Aggregate 5 Double-sided tape 6 Lower frame 7 Handle 8 Reinforcement liner D 'Conventional door

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Ryoji Toyama 2-1-1 Nishi-Shinjuku, Shinjuku-ku, Tokyo Sanwa Shutter Industrial Co., Ltd. (72) Inventor Yasunori Nishikawa 2-1-1 Nishi-Shinjuku, Shinjuku-ku, Tokyo No. 1 Sanwa Shutter Industry Co., Ltd. (72) Megumi Kubota 2-1-1, Nishi-Shinjuku, Shinjuku-ku, Tokyo F-term in Sanwa Shutter Industry Co., Ltd. 2E016 HA06 JA11 KA05 KA07 LA01 LB01 LC02 MA06 MA13 QA14 RA02 3C030 CB06 CB11

Claims (5)

[Claims] 1. A steel door in which an aggregate is interposed between a pair of front and back face plates, wherein the steel door abuts a peripheral portion of one face plate and a peripheral portion of the other face plate. A steel door in which the corresponding contact portion is welded over the entire length by laser beam welding, so that it is not necessary to reinforce the peripheral portion of the aggregate. 2. The method according to claim 1, wherein a prospective surface portion serving as a prospective surface is bent at a peripheral portion of the one face plate, and a leading edge portion of the prospective surface portion and a peripheral edge portion of the other faceplate are in contact with each other. Steel door. 3. The method according to claim 1, wherein a prospective surface portion serving as a prospective surface is welded to the peripheral edge portion of one of the face plates by laser beam welding over the entire length, and a leading edge portion of the prospective surface portion and the other faceplate are welded to each other. A steel door that is in contact with the periphery. 4. The steel door according to claim 1, 2 or 3, wherein one side surface of the aggregate is welded to the one side plate by laser beam welding. 5. After welding one side surface of the aggregate by laser beam welding to a portion excluding the peripheral portion of one face plate, the other side plate is covered on the other side surface of the aggregate, and thereafter, the one side plate is A method of manufacturing a steel door in which the peripheral portion of the other face plate is brought into contact with the peripheral portion, and the corresponding contact portion is welded over the entire length by laser beam welding to eliminate the need for aggregate at the peripheral portion.