JP2010047965A - Method of manufacturing door device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a method of manufacturing a door device which prevents a trace of welding from being exposed on an outer surface when a hinge is welded. <P>SOLUTION: A one-side plate P1 of the hinge 54 is adhered to a hinge mounting surface 49 which is formed on the outside surface of a reinforcing plate storage protrusion 29a of an inside plate 23; a welding surface 44 of an internal reinforcing plate 41 is adhered to an inside surface of the reinforcing plate storage protrusion 29a of the inside plate 23; an electric current is supplied to the reinforcing plate storage protrusion 29a of the inside plate 23, the plate P1 of the hinge 54, and the welding surface 44 of the internal reinforcing plate 41 in a state of clamping them; and a metal contact surface is welded by utilizing electric resistance during the passage of an electric current. Subsequently, the outside and inside plates 21 and 23 are bonded to each other via the internal reinforcing plate 41 with an adhesive 34. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a method of manufacturing a door device including an outer plate and an inner plate.

As a cover structure of a work machine, there is a double structure composed of an outer plate and an inner plate, the inner plate has a plurality of recesses, and the recesses of the inner plate are bonded to the outer plate, and the outer plate The outer side plate and the inner side plate are fixed by hemming the peripheral edge of each. A hinge is directly welded to the flat portion of the convex portion provided relatively to the concave portion of the inner plate (see, for example, Patent Document 1).
JP-A-9-228412 (page 2-3, FIG. 2-8)

  In this conventional double-structured cover body, the hinge is directly attached to the flat portion of the convex portion of the inner plate by welding, which may cause insufficient strength.

  On the other hand, it is conceivable to fix the reinforcing plate between the inner plate and the outer plate, open a part of the inner plate, and weld the hinge to the reinforcing plate. There is a problem in that the appearance quality deteriorates due to welding marks appearing on the surface of the outer plate at a close location or a contact location.

  This invention is made in view of such a point, and when welding a hinge, it aims at providing the manufacturing method of the door apparatus in which a welding trace does not appear on an outer surface.

  The present invention includes an outer plate, an inner plate fixed to the inner surface of the outer plate and having a reinforcing plate housing convex portion formed at least on one side of the outer plate, and a reinforcing plate housing convex portion of the inner plate. A method of manufacturing a door device comprising an inner reinforcing plate fixed on the inner side and a hinge fixed on the outer side of the reinforcing plate storing convex portion of the inner plate, the reinforcing plate storing convex portion of the inner plate and its inner surface A door device manufacturing method comprising: integrally welding an inner reinforcing plate in close contact with a hinge in close contact with an outer surface; and bonding an inner plate to which the inner reinforcing plate is welded to an outer plate. .

  According to the present invention, the internal reinforcing plate is welded after integrally welding the reinforcing plate housing convex portion of the inner plate, the internal reinforcing plate in close contact with the inner side surface thereof, and the hinge in close contact with the outer side surface. Since the inner plate is bonded to the outer plate, when the hinge is welded to the reinforcing plate housing convex portion of the inner plate, the welding current does not affect the outer plate, and no welding marks appear on the surface of the outer plate. , Deterioration of appearance quality can be prevented.

  Hereinafter, the present invention will be described in detail with reference to one embodiment shown in FIGS.

  FIG. 7 shows a hydraulic excavator 10 as a work machine. An upper swing body 12 is turnably provided on a lower traveling body 11, and a cab 13, a work device 14, and a power device 15 such as an engine are mounted on the upper swing body 12. Is installed. The power unit 15 is covered with an upper cover 16, a side door 17, and the like.

  FIG. 8 shows a side door 17 provided in the radiator chamber. The side door 17 is attached to the airframe side frame 18 by hinges 53 and 54, which will be described later, and attached to the airframe side frame on the opposite side. The closed state is maintained by the striker 19s and the latch device 19r that can be engaged and disengaged.

  FIGS. 1 to 5 show a door panel 20 of the side door 17. The door panel 20 is formed by pressing the outer plate 21 and the outer plate 21 in an uneven shape as shown in FIG. A concave portion is fixed to the inner surface of the inner plate 23 and an inner plate 23 that forms a space 22 between the convex portion and the outer plate 21, and foam filled in the space 22 between the outer plate 21 and the inner plate 23. Material 24. The outer plate 21 and the inner plate 23 are provided with a plurality of rows of ventilation openings 25.

  The outer plate 21 has a thickness 1.2 to 5.0 times that of the inner plate 23. In other words, the inner plate 23 uses an iron plate having a thickness smaller than that of the outer plate 21. For example, when the outer plate 21 is a 1.2 mm iron plate, the inner plate 23 is preferably an iron plate of 0.6 mm, 0.8 mm or the like in order to satisfy the conflicting strength and workability.

  The foam material 24 is foamed by heating an unfoamed sheet-like foam material affixed to the inner surface of the outer plate 21 or the inner plate 23 in the space 22 between the outer plate 21 and the inner plate 23, Mold. The foam material is preferably a highly foamable rubber-based sound absorbing material having a volume expansion coefficient of about 20 times. It is desirable to heat the foam material simultaneously with the baking coating using a baking oven for baking coating.

  As shown in FIG. 2 and FIG. 3, the inner side plate 23 includes an opening side joint portion 27 and an outer peripheral side joint portion 28 joined to the outer side plate 21, and bulge molding with respect to these joint portions 27 and 28. And a convex portion 29 formed thereon.

  The convex portion 29 of the inner plate 23 includes a reinforcing plate housing convex portion 29a on the hinge mounting side, and a thick horizontal beam-shaped reinforcing convex portion 29b formed in the lateral direction from the uppermost stage to the third and lowermost stages. The reinforcing projection 29c has a small cross section formed in the horizontal direction of the second step from the top, and the reinforcing projection 29d on the latch mounting side.

  On the thick horizontal beam-shaped reinforcing convex portion 29b, a reinforcing concave portion 30 which is concave in the vertical direction is formed. The reinforcing convex portion 29c having a small cross section is formed to be narrower and lower than the reinforcing convex portion 29b in order to secure the opening area of the ventilation opening portion 25, and the reinforcing concave portion 30 of the reinforcing convex portion 29b is formed. Absent.

  As shown in FIG. 4, the joint portion 27 of the inner plate 23 corresponds to the three rows of vent openings 25 a opened in the outer plate 21, and from the vent openings 25 a of these outer plates 21. Slightly large ventilation openings 25b are provided by drilling.

  The outer peripheral edge of the outer plate 21 is bitten and joined to the peripheral edge of the inner plate 23 by a hemming portion 33 formed by folding back and flattening so as to wrap around the peripheral edge of the inner plate 23. The joint portions 27 and 28 of the inner plate 23 are adhered to the outer plate 21 by an adhesive 34, and the outer plate 21 and the joint portions 27 and 28 of the inner plate 23 are joined and sealed by the adhesive 34. The adhesive 34 is preferably a paste-type structural adhesive having viscosity and thermosetting properties.

  FIG. 2 shows an exploded perspective view of the side door 17 so that it is sandwiched between the outer plate 21 and the inner plate 23 that is positioned with respect to the outer plate 21 and fixed to the inner surface of the outer plate 21. The internal reinforcing plate 41 for attaching the hinge is fixed.

  As shown in FIG. 6, the internal reinforcing plate 41 is provided with an elongated concave reinforcing portion 42 at the center, and the welded surface portions 43 and 44 are planar on one end side and the other end side of the concave reinforcing portion 42, respectively. One positioning fitting portion 45 and the other positioning fitting portion 46 are formed in a concave shape at the center of these welded surface portions 43 and 44.

  With respect to the inner reinforcing plate 41, as shown in FIG. 2, the central portion of the reinforcing plate housing convex portion 29a on the hinge mounting side of the inner plate 23 has a concave shape fitted to the concave reinforcing portion 42 of the inner reinforcing plate 41. Reinforcing part 47 is provided in an elongated shape, and hinge mounting surface parts 48, 49 are respectively formed in a flat shape on one end side and the other end side of this concave reinforcing part 47, and at the center part of each of these hinge mounting surface parts 48, 49, The positioning fitting portion 51 and the other positioning fitting portion 52 are each formed in a convex shape protruding downward in FIG.

  By fitting the positioning fitting portions 45 and 46 of the inner reinforcing plate 41 to the positioning fitting portions 51 and 52 of the inner plate 23, the inner reinforcing plate 41 is positioned with respect to the inner plate 23.

  As shown in FIG. 1, the plates P1 of the hinges 53 and 54 are welded to the hinge mounting surface portions 48 and 49 of the inner plate 23, respectively. As the welding method, resistance welding is used in which the metal contact surface is welded using electrical resistance during energization. Reference numeral 50 denotes a welded portion between the metal contact surfaces.

  The hinges 53 and 54 are rotatably connected to the other side common plate P2 by the shaft member S with respect to the one side plate P1 fixed on the hinge mounting surface portions 48 and 49 of the inner plate 23, A slot H for inserting a bolt for attaching the side door 17 to the machine body side frame 18 is formed in the common plate P2 on the other side.

  As shown in FIGS. 4 and 5, the inner plate 23 has a step-shaped reinforcing deformation portion 56 at the middle portion of the convex portion 29 bulging and formed along the joint portions 27, 28 closely attached to the outer plate 21. The step-shaped reinforcing deformation portion 56 secures a sufficient height of the convex portion 29 with respect to the outer plate 21 and secures the strength.

  In particular, the thick horizontal beam-shaped reinforcing convex portion 29b is excellent in cross-sectional performance such as a secondary moment of section due to the reinforcing deformable portion 56 and the reinforcing concave portion 30, and has a characteristic that it is difficult to be deformed against bending stress.

  On the other hand, as shown in FIG. 4, the reinforcing convex portion 29c having a small cross section is formed to have a smaller width than the reinforcing convex portion 29b, so that the opening area of the ventilation opening portion 25 can be increased. Can be drawn easily.

  As shown in FIG. 8, the upper portion of the door panel 20 is bent toward the fuselage rather than the substantially vertical portion below the door panel 20. Wrinkles are likely to occur at the upper portions of the plate housing convex portion 29a and the reinforcing convex portion 29d on the latch mounting side. Therefore, as shown in FIG. 2 and FIG. 3 and the like, the reinforcing plate housing convex portion 29a on the hinge mounting side of the inner plate 23 and the reinforcing convex portion 29d on the latch mounting side are bent at the place where the bending processing is performed. At the same time, wrinkle prevention recesses 58 and 59 for preventing wrinkles are formed.

  As shown in FIGS. 2 and 6, the inner reinforcing plate 41 is also formed with a recess 60 that fits with one wrinkle-preventing recess 58 of the inner plate 23 to prevent interference with the wrinkle-preventing recess 58. ing.

  As shown in FIGS. 2 and 3, the reinforcing convex portion 29d located below the other wrinkle generation preventing concave portion 59 of the inner plate 23 is provided with damping concave portions 61 and 62 and a latch mounting hole 63. ing. These vibration suppression recesses 61 and 62 are used for preventing vibration of the door panel 20, and as shown in FIG. 8, for example, the vibration suppression protrusions are provided on the machine body side frame provided with the striker 19s that engages with the latch device 19r. 64 and 65 project, and these vibration-suppressing convex portions 64 and 65 can be fitted into the vibration-suppressing concave portions 61 and 62 of the door panel 20 in the closed state, so that the vertical vibration of the door panel 20 can be suppressed. .

  Next, a method for manufacturing the door device will be described.

  As shown in FIG. 1A, the plate P1 on one side of the hinges 53 and 54 is brought into close contact with the hinge mounting surface portions 48 and 49 formed on the outer surface of the reinforcing plate housing convex portion 29a of the inner plate 23, The welding surface portions 43 and 44 of the inner reinforcing plate 41 are brought into close contact with the inner surface of the reinforcing plate storing convex portion 29a of the inner plate 23, the reinforcing plate storing convex portion 29a of the inner plate 23, and the plate P1 of the hinges 53 and 54, In a state in which the welding surface portions 43 and 44 of the internal reinforcing plate 41 are clamped, a resistance welding current is supplied thereto, and the metal contact surface is welded using heat generated by electric resistance during energization. At this time, a welded portion 50 is formed and integrated between the reinforcing plate housing convex portion 29a of the inner plate 23, the plate P1 of the hinges 53 and 54, and the welded surface portions 43 and 44 of the inner reinforcing plate 41. .

  Then, as shown in FIG. 1 (b), the outer side plate 21 and the inner side plate 23 are bonded via the internal reinforcing plate 41. At that time, the outer plate 21 and the inner plate 23 are fixed to each other while fixing the outer plate 21 and the inner plate 23 by a hemming process in which the outer plate 21 is folded and crushed to the peripheral portion of the inner plate 23 and a clamping jig (not shown). The outer side plate 21 and the inner side plate 23 are bonded via the internal reinforcing plate 41 by curing the thermosetting adhesive 34 applied between the plate 23 and the plate 23 in a heating furnace.

  At this time, the foam material pasted on the inner surface of the outer plate 21 or the inner plate 23 is foamed by heating in a baking coating heating furnace, and the space 22 is filled with the foaming material 24. Further, the baking coating heating furnace By the heating, the paint sprayed in advance on the outer surfaces of the outer plate 21 and the inner plate 23 is baked.

  For example, the thermosetting of the adhesive 34 is performed at 150 ° C. for 5 minutes, the foaming material 24 is foamed at 150 ° C. for 20 minutes, and the baking finish is performed at 180 ° C. to 200 ° C. for 20 minutes. Heat. These heating operations can be performed using an existing baking oven for baking coating.

  Next, the function and effect of the embodiment shown in FIGS. 1 to 8 will be described.

  A hollow closed cross-sectional structure formed by the outer plate 21 and the inner plate 23 thinner than the outer plate 21 can reduce the weight, and the inner plate 23 is thicker than the inner plate 23 (1.2-5 of the inner plate 23). A solid closed door structure with a sufficient height formed with the outer plate 21 (having a plate thickness of .0 times) makes a strong door panel that can secure sufficient strength against impact from the outside at a low cost. Can be provided.

  The foam 24 filled between the outer plate 21 and the inner plate 23 absorbs vibration and can effectively attenuate the sound generated from the door panel itself, that is, the sound attenuation effect is high and the noise is low. Can be achieved.

  The inner reinforcing plate 41 is welded integrally with the reinforcing plate housing convex portion 29a of the inner plate 23, the inner reinforcing plate 41 in close contact with the inner surface thereof, and the plates P1 of the hinges 53 and 54 in close contact with the outer surface. Since the inner plate 23 welded to the outer plate 21 is bonded to the outer plate 21, when the hinges 53 and 54 are welded to the reinforcing plate housing convex portion 29a of the inner plate 23, the welding current does not affect the outer plate 21, and the outer plate 21 No welding marks appear on the surface of the plate 21, and deterioration in appearance quality can be prevented.

  The present invention is a door device that can be used for a side door of a working machine such as a hydraulic excavator, a loader, or a bulldozer, for example, a radiator chamber, a battery chamber, or a pump chamber.

It is sectional drawing of the hinge attachment part which shows one Embodiment of the manufacturing method of the door apparatus which concerns on this invention, (a) shows the state immediately after welding, (b) shows the state in which the outer side board was adhere | attached further. . It is a disassembled perspective view of the door apparatus manufactured by the manufacturing method same as the above. It is a front view of the door apparatus manufactured by the manufacturing method same as the above. FIG. 4 is a sectional view taken along the line IV-IV in FIG. 3 of the door device. Fig. 5 is a cross-sectional view taken along the line VV in Fig. 3 of the door device. It is a front view of the internal reinforcement board of a door apparatus same as the above. It is a top view of the working machine provided with the door device same as the above. It is a perspective view of the location which attached the door apparatus same as the above to the working machine.

Explanation of symbols

21 Outer plate
23 Inner plate
29a Reinforcing plate storage convex
41 Internal reinforcing plate
53, 54 Hinge

Claims (1)

An outer plate,
An inner plate fixed to the inner surface of the outer plate and having a reinforcing plate housing convex bulge formed on at least one side of the outer plate;
An internal reinforcing plate fixed to the inside of the reinforcing plate storage convex portion of the inner plate;
A manufacturing method of a door device comprising a hinge fixed to the outside of the reinforcing plate housing convex portion of the inner plate,
Welded the reinforcing plate housing convex part of the inner plate and the inner reinforcing plate closely attached to the inner surface and the hinge closely attached to the outer surface,
A method of manufacturing a door device, wherein the inner plate to which the inner reinforcing plate is welded is bonded to the outer plate.

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