JPH0767619B2 - Manufacturing method for steel flash doors - Google Patents

Description

The present invention relates to a method for manufacturing a high-quality steel flush door suitable for mass production.

[Prior Art] Conventionally, in a steel flush door, two frames of front and back panel plates are bonded and welded to each other with the inner frame as a core material, the surface is ground with a sander, and the edge is putty-finished. It is manufactured by the process.

[Problems to be Solved by the Invention] According to the above-mentioned conventional technique, since a flat plate having a large area is bonded and welded to both sides of the middle frame because it requires manpower and is not suitable for automated line production, the door surface is distorted. However, there is a problem that the quality of the door is deteriorated.

The present invention was devised in order to solve the conventional drawbacks in view of the above circumstances, and the purpose thereof is to:
An object of the present invention is to provide a method for manufacturing a high-quality steel flush door that is suitable for an automated line and has a low price.

[Means for Solving the Problem] In order to solve the problem, the technical means adopted by the present invention are:
Bend the four sides of the rectangular rigid plate in a U shape, and integrally form the door surface, the side surface of the four rounds, and the joint surface of the four rounds, and the half of the door and the other half of the door. And a plurality of horizontal cores are welded to the inner surface of one half of the door, and a plurality of vertical cores are welded to the inner surface of the other half of the door. Either one or both of them are projected a little higher than the joint surface of each door half-manufactured portion, and a plurality of welding projections are projected on the joint surface of the four circumferences of either one of the door semi-manufactured portions. The two door semi-manufactured parts that were manufactured are sandwiched between the opposing flat surfaces of the jig by aligning the respective joint surfaces, and first the horizontal and vertical core materials of both door semi-manufactured parts are brought into contact with each other, and The central electrode pressed into contact with the central part is energized to weld the intersection of both core materials, and then the one joint surface of both door semi-finished parts and the projection of the other joint surface are contacted. Is characterized in that to produce by welding both door surface circumferential section the joining surfaces by energizing the pressure was periphery electrodes so.

[Operation of the Invention] Therefore, according to the manufacturing method of the present invention, the manufacturing of both door half-portions and the welding and joining thereof can all be integrated in an automated line, and the door surface of both door half-portions can be manufactured. Since the four edges are reinforced by bending and both door surfaces are sandwiched and welded by the opposing flat surfaces of the jig, a flat door surface without distortion can be obtained.

[Embodiment] The configuration of the present invention will be described in detail based on an embodiment shown in the drawings.

FIG. 1 is a perspective view showing the door semi-finished parts facing each other, and FIGS. 2 (A), (B), and (C) are sectional views showing the sequence of welding the door semi-finished parts, FIG. 3 is an elevation view of the completed door.

In the figure, reference numeral 2 denotes a half-finished part of the door 1, and the half-finished part 2 is formed by bending four sides of a square steel plate into a U-shape to form one face 3 of the door 1, four side faces 4 and a joining face 5 of four turns. Are integrally formed, and a plurality of horizontal core members 6 having an L-shaped cross section are welded to the inner surface thereof.

The thickness t of the side surface 4 of the half-finished part 2 is set to 1/2 of the thickness of the side surface of the completed door 1. A plurality of welding projections 7 are stamped on the joint surface 5 on the four sides.

In the figure, 2'denotes the other half-formed part of the door 1, and the other half-formed part 2'has exactly the same shape as the one-half made-up part 2, and in the same manner, the four sides of the latter half of the square are bent in a U-shape. 1 other surface 3 ', four side surfaces 4'and four connecting surfaces 5'are integrally formed,
A vertical core material 8 having an L-shaped cross section is duplicate-welded to this inner surface. In addition, the thickness t of the side surface 4'of the semi-finished part 2'is also the completed door 1
However, the vertical core member 8 is slightly higher than the thickness t of the side surface 4'and protrudes from the joint surface 5'by Δt.

It should be noted that holes 11 and a notch 12 for attaching the door knob 9 and the lock box 10 are provided at positions corresponding to each other in both the half-molded portions 2 and 2 '.

The two semi-finished parts 2, 2'form a four-fold bent part by pressing a standard length steel plate, and then a horizontal core material 6 and a vertical core material 8 are respectively formed on the inner surfaces of the semi-finished parts 2, 2 '. It is fixed with a jig and finished on an automated line that performs spot welding.

Next, the joining surfaces 5 and 5'are made to face each other and the two half-finished portions 2 and 2'are
As shown in FIG. 2, the central welding electrodes 16 and 16 and the peripheral welding electrodes 17 and 17 that constitute the automatic welding machine 13 are attached to the respective opposing flat surfaces, and the upper and lower crimping jigs 14 and 15 are aligned. The two half halves 2, 2'which are aligned with each other are sandwiched between and.

At this time, since the vertical core material 8 of the other half-formed portion 2'is slightly higher than the thickness t of the side surface 4'of the other half-formed portion 2'and protrudes from the joining surface 5'by Δt, both half-formed portions are formed. When 2 and 2'are sandwiched between the upper and lower crimping jigs 14 and 15, first, as shown in FIG. The core material 8 contacts.

Next, when the central electrodes 16 and 16 are energized while applying pressure in the vertical direction to the crimping jigs 14 and 15, as shown in FIG. 2B, the horizontal core member 6 and the vertical core member 8 intersect. As the parts are welded, the first half 2 sinks and its projection 7 contacts the joining surface 5'of the second half 2 '.

After that, when the peripheral electrodes 17, 17 are energized while further applying the pressure in the vertical direction to the respective crimping jigs 14, 15, as shown in FIG. Each joint surface 5,
The portions 5'are welded together so that the two semi-finished parts 2, 2'are joined together. Then, the two half-finished parts 2, 2'integrated as described above are coated after being surface-treated,
By attaching the door knob 9, hinge 16 etc.
The flash door 1 as shown in the figure is completed.

Here, the black dots in FIG. 3 indicate the above-mentioned welded portions, and in this welding process, both door surfaces 3, 3'of both half-finished portions 2, 2'are reinforced by four-fold bending. Since the upper and lower crimping jigs 14 and 15 are sandwiched and welded between the opposing flat surfaces, welding distortion of both door surfaces 3 and 3'can be prevented in advance.

In the above embodiment, the vertical core material 8 is projected higher than the joint surface 5'of the other half-finished portion 2 ', but the horizontal core material 6 side is closer to the joint surface 5 of the half-finished portion 2. Project high,
Alternatively, both the vertical and horizontal core members 8 and 6 are connected to the joint surfaces 5,
5'may be made to project little by little, and the welding projection 7 may have both half-finished parts 2,
It may be projected on any of the joining surfaces 5, 5'of 2 '.

[Effects of the Invention] In short, according to the present invention, four sides of a rectangular rigid plate are bent in a U-shape to integrally form a door surface, a side surface of four circumferences, and a joint surface of four circumferences. 2 One-half and two-half-thick doors are manufactured, respectively, and a plurality of horizontal cores are formed on the inner surface of the door half and a plurality of vertical cores are formed on the inner surface of the other half. Welded respectively, either or both of the horizontal core material or the vertical core material,
Project a little higher than the joint surface of each door half-structure, and project a plurality of welding projections on the joint surface of the four laps of either one of the door half-molds, and the previously manufactured both door half-structures The joint surfaces are aligned and sandwiched between the opposing flat surfaces of the jig, and first the horizontal core material and the vertical core material of both door semi-finished parts are brought into contact with each other,
Electric current is applied to the central electrode pressed against the central portions of both door surfaces to weld the intersection of both core materials, and then the one joint surface of the two door half sections and the projection of the other joint surface are brought into contact with each other. Since the electrodes are energized to weld the peripheral electrodes that are pressed against the peripheral parts of both door surfaces, both joint surfaces are welded together, so the number of parts is small, and the manufacture of the door half-finished parts and their welding are all mechanical processes. Since it can be performed by using the automated line, productivity can be improved, product cost can be reduced, and the door surfaces of both halves are reinforced by four-fold bending. Since both door surfaces are sandwiched and welded between the facing planes of the jig, a flat surface without distortion can be obtained and the quality of the flush door can be improved, which is extremely useful. Produce a new effect Than it is.

[Brief description of drawings]

The drawings show an embodiment of a method for manufacturing a steel flush door according to the present invention, in which FIG. 1 is a perspective view showing the semi-finished parts of the doors facing each other, and FIG. ),
(B) and (C) are sectional views showing the order of welding the semi-finished parts of the door, and FIG. 3 is an elevation view of the completed door. In the figure, 1 ... Door, 2 ... One half-part, 2 '... Other half-part, 3,
3 '... door surface, 4, 4' ... side surface 5, 5 '... joining surface, 6 ... transverse core material, 7 ... welding projection, 8
…… Vertical core material, 9 …… Door knob, 10 …… Lock box, 11 …… Hole,
12 …… notch, 13 …… automatic welding machine, 14 …… upper crimping jig, 15 …… lower crimping jig, 16 …… hinge.

Claims (1)

[Claims] Claims: 1. A rectangular rigid plate having four sides bent in a U-shape to integrally form a door surface, a four-sided side surface, and a four-sided joint surface, and a door half having a thickness of 1/2 of the door thickness. And a plurality of horizontal cores are welded to the inner surface of one half of the door, and a plurality of vertical cores are welded to the inner surface of the other half of the door. One or both of the core material and the vertical core material are projected slightly higher than the joint surface of each door half-structure, and a plurality of welding projections are projected on the joint surface of four rims of either door half-structure. The two door half-manufactured parts that have been manufactured in advance are sandwiched between the opposing flat surfaces of the jig by aligning the respective joint surfaces, and first the horizontal and vertical core members of both door half-manufactured parts are brought into contact with each other. , The central electrode pressed against the center of both door surfaces is energized to weld the intersection of both core materials, and then the projection of the one joint surface and the other joint surface of both door semi-finished parts. Method for producing a steel flush doors, characterized in that contacting the emissions produced by welding the joining surfaces by energizing the peripheral portion electrode pressed against the both door surface peripheral portion.