JP4873648B2 - Door panel - Google Patents

Description

  The present invention relates to a door panel including an outer plate and an inner plate.

  FIG. 19 shows a hydraulic excavator 10 as a work machine, and 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 placed on the upper swing body 12. Is installed. The power unit 15 is covered with an upper cover 16 and side doors 17 and 18. The side doors 17 and 18 are attached so as to be openable and closable by a hinge which will be described later, and the closed state is held by a latch device 19.

  As the side doors 17 and 18 of the work machine, there is a double cover structure in which an outer plate is integrated with an inner plate having a truncated cone-shaped recess. The concave portion of the inner plate is bonded to the outer plate (see, for example, Patent Document 1).

  On the other hand, as shown in FIG. 3, the applicant, in a double-structured door panel composed of an outer plate 21 and an inner plate 23, has a concave joint portion 27 in close contact with the inner plate 23. In addition, there is proposed a door panel provided with a convex portion 29 bulging and formed with respect to the joint portion 27, and a reinforcing deformation portion 56 formed in a step shape at an intermediate portion of the convex portion 29.

The inner panel 23 of the door panel has a two-stage structure of a first-stage convex part and a second-stage convex part via a reinforcing deformation part 56 having a stepped flat part, so that the inner side where the convex part is simply formed The strength of the plate can be improved, and the strength of the entire door panel can be improved.
JP-A-9-228412 (3rd page, FIG. 7-8)

  However, as shown in FIG. 3, the convex portion 29 of the inner plate 23 passes through the first curved corner portion 61 having a concave curved surface located closer to the joint portion 27 than the reinforcing deformable portion 56, and the reinforcing deformable portion 56. The concave curved second-stage corner portion 62a is formed, and if the curvature radii r, r of the concave curved surfaces of these corner portions 61, 62a are set to be the same, the corner portions 61, 62a are connected to each other. The flat surface portion 64 of the reinforcing deformation portion 56 formed in is widest.

  As described above, the flat surface portion 64 of the reinforcing deformation portion 56 is the largest between the concave curved surfaces of the first step corner portion 61 and the second step corner portion 62a, so that the inner plate 23 is formed from one sheet metal material by pressing. When the sheet is rolled, the sheet metal material is less likely to flow in the plane part 64 between the concave curved surfaces, which adversely affects the press formability of the corner part.

  This invention is made | formed in view of such a point, and it aims at providing the door panel which has a shape where a sheet metal material flows easily when rolling an inner plate from a sheet metal material.

  The invention described in claim 1 includes an outer plate and an inner plate that is fixed to the inner surface of the outer plate and forms a space between the outer plate, and the inner plate is in close contact with the outer plate. A concave joint portion, a convex portion bulged with respect to the joint portion, and a reinforcing deformation portion formed in a step shape at an intermediate portion in the bulging direction of the convex portion. A concave-curved first step corner portion located closer to the joint portion, and a concave-curved second step corner portion formed via a reinforcing deformation portion, This is a door panel in which a reinforcing deformation portion is formed to be the narrowest between the concave curved surfaces of each corner portion so that the concave curved surface and the concave curved surface of the second stage corner portion are close to each other without passing through a flat portion.

  According to a second aspect of the present invention, in the door panel according to the first aspect, the radius of curvature of the concave curved surface of the second stage corner portion is set larger than the radius of curvature of the concave curved surface of the first stage corner portion. The center of the concave curved surface of the step corner portion is located inside the corner from the center of the concave curved surface of the first step corner portion.

  According to the first aspect of the present invention, the inner plate includes a reinforcing deformation portion formed in a step shape at a middle portion of the convex portion bulged with respect to the concave joint portion in close contact with the outer plate. The concave curved surface of the first step corner portion located on the joint side from the reinforcing deformation portion and the concave curved surface of the second step corner portion formed through the reinforcing deformation portion are close to each other without passing through the flat portion. Since the reinforcing deformation portion is formed to be the narrowest between the concave curved surfaces of each corner portion, the concave curved surface of the first step corner portion and the concave curved surface of the second step corner portion are separated by the plane portion. The sheet metal material flows from the concave curved surface of the second-stage corner portion to the concave curved surface of the first-stage corner portion when the inner plate is rolled from the sheet metal material with the outer peripheral edge fixed. It is easy to improve the press formability of the corner portion.

  According to the second aspect of the present invention, the concave curved surface of the second-stage corner portion having a larger radius of curvature than the concave curved surface of the first-stage corner portion opens more gently than the concave curved surface of the first-stage corner portion. Therefore, the material flow on the concave curved surface of the second stage corner portion is smooth, and the center of the concave curved surface of the second stage corner portion is the concave curved surface of the first stage corner portion. Since the concave curved surface of the second-stage corner portion is close to the concave curved surface of the first-stage corner portion, the second-stage corner portion is formed from the second-stage corner portion when rolling the inner plate. The material flow to the first stage corner becomes smooth.

  Hereinafter, the present invention will be described in detail with reference to the first embodiment shown in FIGS. 1 to 16 and the second embodiment shown in FIGS. 17 and 18.

  FIG. 16 shows a hydraulic excavator 10 as a working machine, and 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 provided 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. The side door 17 is attached so as to be openable and closable by a hinge which will be described later, and is kept closed by a latch device which will be described later.

  4 to 8 show the door panel 20 of the side door 17. As shown in FIGS. 5 and 6, the door panel 20 is formed by pressing the outer plate 21 and the outer plate 21 in an uneven shape. A concave portion is fixed to the inner surface of the outer plate 21 and an inner plate 23 that forms a space 22 between the convex portion and the outer plate 21, and a space 22 between the outer plate 21 and the inner plate 23 is filled. Foamed material 24 is provided.

  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.

  As shown in FIG. 6, the foam material 24 heats an unfoamed sheet-like foam material 24 a affixed to the inner surface of the inner plate 23 in a space 22 between the outer plate 21 and the inner plate 23. Foam and mold. The foam material 24a is desirably 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 24a simultaneously with the baking coating using a baking coating heating device.

  As shown in FIGS. 4 and 7, the outer plate 21 has a plurality of ventilation holes 25 formed in a regular hexagonal shape, and a ventilation hole assembly in which the ventilation holes 25 are aggregated in a honeycomb shape through the joint portions of the sides. A plurality of honeycomb-shaped air hole assembly portions 26 as a portion are provided by hole processing.

  As shown in FIG. 8, the inner side plate 23 is formed in a concave shape and joined portions 27 and 28 as concave portions joined to the outer side plate 21, and convex portions formed by bulging with respect to the joined portions 27 and 28. Part 29.

  The joint portions 27 of the inner plate 23 are formed in three rows in the horizontal direction corresponding to the honeycomb-like vent hole assembly portions 26 of the outer plate 21, and the honeycomb-like vent hole assembly portions of the outer plate 21 are formed in these joint portions 27. Ventilation openings 30 larger than 26 are provided by drilling.

  That is, a plurality of sets of ventilation openings 30 opened on the honeycomb-shaped ventilation hole assembly portion 26 of the outer side plate 21 and the joining portion 27 as the concave portion of the inner side plate 23 are provided in one-to-one correspondence. The ventilation opening 30 of the inner plate 23 is formed to be slightly larger than the honeycomb-shaped ventilation hole assembly 26 of the outer plate 21.

  As shown in FIGS. 9 to 11, the peripheral portion 31 of the outer plate 21 is hemmed so as to be folded and crushed so as to wrap around the peripheral portion 32 of the inner plate 23. That is, the outer plate 21 includes a hem processing portion 33 that bites and joins the peripheral portion 32 of the inner plate 23 with a peripheral portion 31 formed by folding back and flattening so as to wrap around the peripheral portion 32 of the inner plate 23. Yes.

  As shown in FIG. 9, at least the peripheral edge portion 32 of the inner plate 23 is bonded to the outer plate 21 with an adhesive 34, and the outer plate 21 and the inner plate 23 are bonded to each other at the hemming portion 33 by the adhesive 34. And seal. The adhesive 34 is preferably a paste-type structural adhesive having viscosity and thermosetting properties.

  As shown in FIG. 10 and FIG. 11, the corner portion of the outer plate 21 and the folded portion of the intermediate bent portion are notched at the peripheral edge portion 31 of the outer plate 21, respectively. An intermediate bent portion notch groove 36 is formed. The corners of the inner plate 23 corresponding to the corner cutout grooves 35 of the outer plate 21 are formed in an arc shape.

  FIG. 12 is an exploded perspective view of the side door 17, and is sandwiched between the outer plate 21 and the inner plate 23 that is positioned with respect to the outer plate 21 and is fixed to the inner surface of the outer plate 21. The internal reinforcing plate 41 for attaching the hinge is fixed.

  The internal reinforcing plate 41 is provided with a concave / convex joint portion 42 in which a concave / convex portion is repeatedly formed in the central portion, and hinge mounting surface portions 43 and 44 are continuously formed on one end side and the other end side of the concave / convex joint portion 42, respectively. One positioning fitting portion 45 and the other positioning fitting portion 46 are formed in a concave groove shape adjacent to the hinge mounting surface portions 43 and 44.

  With respect to the internal reinforcing plate 41, the convex portion 29 on the hinge mounting side of the inner plate 23 is provided with a concave / convex joint portion 47 in which a concave / convex portion is repeatedly formed in the center portion. Hinge mounting windows 48 and 49 are opened on the end sides, respectively, and one positioning fitting portion 51 and the other positioning fitting portion 52 protrude downwardly adjacent to the hinge mounting windows 48 and 49. It is formed in a shape.

  In the internal reinforcing plate 41, the size of one positioning fitting portion 45 and the other positioning fitting portion 46 are different. Similarly, in the inner plate 23, the size of one positioning fitting portion 51 and the other positioning fitting portion 52 are different. One positioning fitting portion 45 and positioning fitting portion 51 respectively provided at one of the corresponding positions of the inner reinforcing plate 41 and the inner plate 23 are unevenly fitted to each other so that the inner reinforcing plate 41 and the inner plate 23 are fitted. The other positioning fitting portion 46 and the positioning fitting portion 52 provided at the other corresponding position of each other are concavo-convexly fitted to each other.

  During positioning and fitting of the internal reinforcing plate 41, the concave / convex joint portion 42 of the internal reinforcing plate 41 is brought into close contact with the back surface of the concave / convex joint portion 47 of the inner plate 23 coated with an adhesive, and the hinge of the internal reinforcing plate 41 Since the mounting surface portions 43 and 44 are aligned with the hinge mounting windows 48 and 49 of the inner plate 23, the hinges 53 and 54 are connected to the hinge mounting surface portions 43 and 44 of the internal reinforcing plate 41 through these hinge mounting windows 48 and 49. Install each by welding.

  As shown in FIG. 12, the outer plate 21 and the inner plate 23 are provided with mounting holes 55a and 55b for mounting the latch device 19.

  FIG. 13 shows a method of manufacturing the door panel 20 in which the internal reinforcing plate 41 is incorporated. (A) The internal reinforcing plate 41 is positioned within the convex portion 29 of the inner plate 23 bulged and formed with respect to the outer plate 21. Then, the adhesive is applied between the concave and convex joint portions 42 and 47. A thermosetting adhesive 34 is also applied to the joint surfaces of the inner plate 23 and the inner reinforcing plate 41 that are joined to the outer plate 21. (B) The inner plate 23 in an adhesive-applied state is fitted into the peripheral portion 31 of the outer plate 21 via the inner reinforcing plate 41 in the bent and opened state while the peripheral portion 31 of the outer plate 21 is being hemmed. The inner plate 23 and the inner reinforcing plate 41 are positioned with respect to the outer plate 21. (C) The inner plate 23 and the inner reinforcing plate 41 are joined and fixed to the inner side surface of the outer plate 21 by folding the peripheral portion 31 of the outer plate 21 with the peripheral portion 32 of the inner plate 23 sandwiched by hemming. Seal.

  As shown in FIG. 14, the inner plate 23 has a convex portion 29 bulged with respect to the joint portion 27 formed in a concave shape and in close contact with the outer plate 21. A step-shaped reinforcing deformation portion 56 is formed in the middle of the direction. The joint portion 27 of the inner plate 23 is bonded to the outer plate 21 by the adhesive 34, and the rising portion 57 of the convex portion 29 with respect to the joint portion 27 is continuously formed in an arc shape.

  The convex portion 29 and the reinforcing deformation portion 56 are formed endlessly along the concave joint portion 27 as shown in FIGS.

  FIG. 15 is a reference diagram showing a case where there is no step-shaped reinforcing deformation portion 56 for comparison with FIG. 14, and an arc-shaped rising portion 57 can be installed by the reinforcing deformation portion 56 as shown in FIG. In this case, it rises at a small angle θ1 (<θ2) with respect to the outer plate 21, but because there is a step-shaped reinforcing deformation portion 56, the convex portion 29 can be set to a sufficient height H1 (> H2). It becomes.

  As shown in FIG. 1, the convex portion 29 of the inner plate 23 is formed through a concave curved first-stage corner portion 61 positioned on the joint portion 27 side with respect to the reinforcing deformation portion 56, and the reinforcing deformation portion 56. And a concave curved surface of the first-stage corner portion 61 and a concave curved surface of the second-stage corner portion 62 are close to each other without passing through a plane portion. In addition, there is a non-planar portion 63 in which a reinforcing deformation portion 56 is formed to be narrowest between the concave curved surfaces of the corner portions 61 and 62.

  In order to form such a non-planar portion 63, as shown in FIG. 2, the radius of curvature R of the concave curved surface of the second stage corner portion 62 is set to the radius of curvature of the concave curved surface of the first stage corner portion 61. It is desirable to set it to be larger than r and to place the center P62 of the concave curved surface of the second stage corner portion 62 inside the corner from the center P61 of the concave curved surface of the first stage corner portion 61.

  FIG. 3 is a reference diagram for comparison with FIG. 2. When the radius of curvature r of the concave surface of the second stage corner portion 62a is set equal to the radius of curvature r of the concave surface of the first stage corner portion 61, FIG. As a result, a flat portion 64 is formed between the concave curved surfaces of the corner portions 61 and 62a where the reinforcing deformation portion 56 expands to the maximum.

  As shown in FIG. 8, the inner plate 23 includes an adhesive reservoir 68 having a space for storing an adhesive in a joint 27 bonded to the outer plate 21 with an adhesive. The adhesive reservoir 68 of the inner plate 23 is provided in a continuous convex manner in the longitudinal joint 27 along the vent opening 30 provided at a location corresponding to the vent hole 25 of the outer plate 21. ing.

  As shown in FIG. 8, the inner plate 23 includes convex portions 29 that are bulged with respect to the joint portions 27 and 28, and among the convex portions 29, the upper and lower portions of the vent opening 30 are provided. Is provided with a projecting reinforcing convex portion 29a which is continuously bulged and formed along a lateral joint portion 27 which is continuously bonded to the outer plate 21, and the reinforcing convex portion 29a is further provided. Reinforcing recesses 70 are formed in a concave shape in the transverse direction.

  Next, the manufacturing process of the door panel 20 will be described.

  As shown in FIG. 6, a foam material 24a is affixed in the convex portion 29 of the inner plate 23, and the hinge mounting inner portion is placed in the convex portion 29 on one side of the inner plate 23 as shown in FIG. 13 (a). The reinforcing plate 41 is bonded, and further, a thermosetting adhesive 34 necessary for bonding to the outer plate 21 is applied to the bonding portion 27 as the concave portion of the inner plate 23 and the inner reinforcing plate 41, and FIG. As shown in FIG. 13C, the outer plate 21 and the inner plate 23 are positioned and overlapped, and the peripheral portion 31 of the inner plate 23 is hemmed as shown in FIG. The inner plate 23 and the inner reinforcing plate 41 are joined to the inner side surface of the outer plate 21 by folding and folding.

  Then, the adhesive 34 is cured by heating of the baking coating heating equipment to bond the inner plate 23 and the internal reinforcing plate 41 to the outer plate 21, and further, as shown in FIG. 6, heating of the baking coating heating equipment. The foam material 24a is foamed by this, the space 22 is filled with the foam material 24, and the paint sprayed in advance on the outer surfaces of the outer plate 21 and the inner plate 23 is baked by heating of the baking coating heating equipment. wear.

  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 can be performed using the existing baking heating equipment.

  Finally, as shown in FIG. 8, the hinges 53 and 54 are welded to the hinge mounting surface portions 43 and 44 of the internal reinforcing plate 41 by fillet welding or the like through the hinge mounting windows 48 and 49 of the inner plate 23, respectively. At the same time, the latch device 19 is attached to the mounting holes 55a and 55b of the outer plate 21 and the inner plate 23.

  Next, effects of the first embodiment shown in FIGS. 1 to 16 will be described.

  As shown in FIG. 6, the 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 (inner side). The hollow closed cross-section structure with a sufficient height formed with the outer plate 21 (having a plate thickness 1.2 to 5.0 times that of the plate 23) provides sufficient strength against impact from the outside. A strong door panel that can be secured can be provided at low cost.

  Furthermore, the vibration can be absorbed by the foam material 24 filled between the outer plate 21 and the inner plate 23, and the sound generated from the door panel itself can be effectively attenuated, that is, the sound attenuation effect is high. Low noise can be achieved.

  As shown in FIGS. 5 and 8, the inner plate 23 is thinner than the outer plate 21 by bulging and forming the convex portion 29 with respect to the joint portion 27 formed in the concave shape of the inner plate 23. Even if it exists, it can shape | mold so that rigidity may be increased with a concavo-convex structure and can raise intensity | strength.

  As shown in FIGS. 9 and 10, the hemming portion formed by folding and crushing the peripheral portion 31 of the outer plate 21 so as to wrap around the peripheral portion 32 of the inner plate 23 is thicker than the inner plate 23. Even with the plate 21, a hemming portion 33 having a fixed shape can be obtained, and a folded joint portion with stable quality can be obtained.

  That is, the hemming portion 33 that bites and joins the peripheral edge portion of the inner side plate 23 with the peripheral edge portion of the outer side plate 21 is folded back so as to wrap around the peripheral edge portion of the inner side plate 23. The shape of the hemming portion 33 of the outer plate 21 can be stabilized and the uniform quality can be maintained from the conventional hemming finish in which the bent portion is bulged into a circular cross section.

  At this time, it is not easy to fold the peripheral edge of the outer plate 21 at the corner and the intermediate bent portion of the outer plate 21, but the outer plate 21 is cut by the corner notch groove 35 as shown in FIGS. Since the folded portion of the corner portion of the outer plate 21 is cut out by the middle bent portion cutout groove 36, the corner portion and the middle bent portion of the outer plate 21 are also cut out. It is possible to easily and accurately process the peripheral portion 31 of the outer plate 21 to be folded back and flattened.

  As shown in FIG. 9, the outer plate 21 and the inner plate 23 can be reliably integrated by bonding with the adhesive 34 and the hemming portion 33 of the outer plate 21.

  As shown in FIG. 10, the corners of the inner side plate 23 corresponding to the corner notch grooves 35 of the outer side plate 21 are formed in an arc shape so that the corners of the inner side plate 23 are the corner notches of the outer side plate 21. Protruding from the groove 35 can be prevented.

  As shown in FIG. 11, the ventilation opening 30 of the inner plate 23 is provided larger than the honeycomb-shaped ventilation hole assembly 26 of the outer plate 21, so that the inner plate 23 is integrated with the inner surface of the outer plate 21. Even when manufacturing tolerances occur, that is, even if the alignment of the outer plate 21 and the inner plate 23 is not accurate due to the size tolerance of the press-formed product, the honeycomb-like vent hole set of the outer plate 21 Since the portion 26 is displaced within the range of the ventilation opening 30, it is possible to prevent the inner plate 23 from blocking the honeycomb-shaped ventilation hole assembly portion 26 of the outer plate 21, and the ventilation openings of the outer plate 21 and the inner plate 23 can be prevented. The area is not damaged, a predetermined opening area can be secured, the outer plate 21 and the inner plate 23 can be easily aligned, and the workability during manufacturing can be improved.

  As shown in FIG. 8, a sufficient ventilation opening area can be secured by the plurality of sets of honeycomb-shaped ventilation hole assembly portions 26 and the ventilation opening portions 30.

  As shown in FIG. 11, in the double-structure door panel of the outer plate 21 and the inner plate 23, the outer plate 21 can be opened with a high density in a honeycomb shape with respect to the limited ventilation opening 30 of the inner plate 23. The honeycomb-shaped vent hole assembly portion 26 having a high opening area efficiency can be formed by the simple vent holes 25. The honeycomb-shaped vent hole assembly portion 26 has a plurality of regular hexagonal vent holes 25 on each side of the vent hole. Since it is assembled in a honeycomb shape via the joint portions, it is possible to reduce the fluid resistance by narrowing the joint portions while ensuring the strength of the joint portions between the vent holes 25. The generation of turbulent flow due to the air flow being obstructed by the joint portion can be reduced from the vent hole assembly portion in which round holes and square holes are assembled.

  As shown in FIG. 12, the inner reinforcing plate 41 fixed between the inner plate 23 and the outer plate 21 at the convex portion 29 in which the inner plate 23 bulges with respect to the outer plate 21 of the door panel 20, The strength at the convex portion 29 can be reinforced, and in particular, the internal reinforcing plate 41 is positioned by the concave-convex fitting with respect to the inner plate 23. The position of 41 can be controlled, and the internal reinforcing plate 41 can be accurately positioned and fixed at the position where the reinforcement works most efficiently.

  That is, the positioning of the long internal reinforcing plate 41 with respect to the inner plate 23 is facilitated by the concave / convex fitting of one positioning fitting portion 45, 51 and the concave / convex fitting of the other positioning fitting portion 46, 52. You can be sure.

  Since the positioning fitting portions 45, 51 on one side and the positioning fitting portions 46, 52 on the other side are different in size, if the orientation of the internal reinforcing plate 41 is different, the positioning fitting portions 51, 52 of the inner plate 23 are different. Since the positioning fitting portions 45 and 46 of the internal reinforcing plate 41 cannot be aligned, the internal reinforcing plate 41 having directionality can be accurately incorporated into the inner plate 23.

  Since the hinges 53 and 54 are welded to the hinge mounting surface portions 43 and 44 of the internal reinforcing plate 41 through the hinge mounting windows 48 and 49 opened in the inner plate 23, the hinge is more than the case where the hinges 53 and 54 are attached to the inner plate 23. The mounting strength of 53 and 54 can be improved.

  As shown in FIG. 13, the inner plate 23 in an adhesive-applied state is attached to the inner reinforcing plate 41 in the peripheral portion 31 of the outer plate 21 in a bent and opened state while the peripheral portion 31 of the outer plate 21 is hemmed. The inner plate 23 and the inner reinforcing plate 41 are placed on the inner surface of the outer plate 21 by folding and positioning the peripheral portion 31 of the outer plate 21 with the peripheral portion 32 of the inner plate 23 sandwiched therebetween by hemming. Since the peripheral edge 31 in the middle of the hemming process of the outer side plate 21 is effectively used for positioning the inner side plate 23, the strength at the convex portion 29 of the inner side plate 23 that is formed in a concavo-convex shape with respect to the outer side plate 21 is secured. Can be secured by the internal reinforcing plate 41.

  As shown in FIG. 14, sufficient strength can be ensured by the hollow closed cross-sectional structure formed by the outer plate 21 and the inner plate 23, and the inner plate 23 is connected to the joint portion 27 in close contact with the outer plate 21. On the other hand, since the reinforcing deformation portion 56 is formed in a step shape at the intermediate portion of the bulging-formed convex portion 29, the strength is improved as compared with the inner plate 23 in which the convex portion 29 is simply formed as shown in FIG. The strength of the entire door panel can be improved.

  By increasing the height H1 of the convex portion 29 by the stepped reinforcing deformation portion 56, the second moment of the cross section with respect to the load direction is proportional to the cube of the height H1, thereby strengthening the structure structurally. On the other hand, in the rising portion 57 of the convex portion 29 continuously formed in an arc shape with respect to the joint portion 27, the angle θ1 with respect to the outer plate 21 can be made smaller than the angle θ2 of FIG. Even if the excess adhesive 34 generated when the portion 27 is bonded to the outer plate 21 with the adhesive 34 flows out into the convex portion 29, it is sufficient between the rising portion 57 of the convex portion 29 and the outer plate 21. The adhesive 34 having a thickness can be left to prevent the adhesive 34 from expanding into the convex portion 29, and the adhesive strength 34 of the inner plate 23 to the outer plate 21 can be increased by the solidified adhesive 34 having a thick residual shape. Can do.

  As shown in FIG. 8, the joint portion 27, the convex portion 29 formed in an endless manner along the joint portion 27, and the reinforcing deformation portion 56 reinforce each other so that the strength of the inner plate 23 is increased as a whole. Can be improved over time.

  As shown in FIG. 1 and FIG. 2, the inner plate 23 is a reinforcing deformation formed in a step shape at an intermediate portion of the convex portion 29 bulged with respect to the concave joint portion 27 closely attached to the outer plate 21. A concave curved surface of the first step corner portion 61 which is provided on the joint 27 side of the reinforcing deformation portion 56 and a concave curved surface of the second step corner portion 62 formed via the reinforcing deformation portion 56. 3 has a non-planar portion 63 in which the reinforcing deformation portion 56 is formed to be the narrowest between the concave curved surfaces of the corner portions 61 and 62 so as to be close to each other without passing through the planar portion, as shown in FIG. The discontinuity in the case where the concave curved surface of the first step corner 61 and the concave curved surface of the second step corner 62a are separated by the plane portion 64 can be eliminated, and the inner plate 23 can be made from the sheet metal material with the outer peripheral edge fixed. As shown in FIG. 2, the sheet metal from the continuous concave curved surface of the second stage corner portion 62 to the concave curved surface of the first stage corner portion 61 is formed. Charge tends to flow, can improve the press formability of the corner portion.

  As shown in FIG. 2, the concave curved surface of the second stage corner portion 62 having a curvature radius R larger than the curvature radius r of the concave curved surface of the first stage corner portion 61 is a concave shape of the first stage corner portion 61. Since the curved surface is more gently opened than the curved surface, the material flow on the concave curved surface of the second-stage corner portion 62 is smoother than the reinforcing deformation portion 56 having the enlarged flat surface portion 64 as shown in FIG. And the center P62 of the concave surface of the second stage corner portion 62 is located inside the corner from the center P61 of the concave surface of the first stage corner portion 61, so that the concave portion of the second stage corner portion 62 is recessed. The curved surface is close to the concave curved surface of the first stage corner 61, and the material flow from the second stage corner 62 to the first stage corner 61 when the inner plate 23 is rolled is smoothed.

  As described above, the first-stage corner portion 61 and the second-stage corner portion 62 approach each other, and the plane portion 64 between these corner portions disappears, so that the sheet metal material can easily flow and work easily. The concave curved surfaces of the first stage corner portion 61 and the second stage corner portion 62 can be rolled and formed by one press working.

  As shown in FIG. 8, an adhesive reservoir 68 for accumulating adhesive is provided in the joint 27 of the inner plate 23 bonded to the outer plate 21 with an adhesive. When pressed and adhered, the adhesive extruded from between the outer plate 21 and the joint portion 27 of the inner plate 23 remains in the adhesive reservoir space in the adhesive reservoir 68, and this adhesive is Bonding strength when cured can be maintained. When used as a side door, the adhesive reservoir 68 continuously provided in the longitudinal joining portion 27 also functions as a vertical column, and can improve strength against a vertical load.

  As shown in FIG. 8, along the joint portion 27 of the inner plate 23 continuously bonded to the outer plate 21, the projecting reinforcing convex portion 29a continuously bulging and forming is formed on the outer plate 21. Reinforcement that improves the strength of the bonded inner plate 23 can be achieved, and the reinforcing concave portion 70 formed in a concave shape in a direction transverse to the reinforcing convex portion 29a makes the reinforcement by the reinforcing convex portion 29a stronger. In short, the inner plate 23 can be strengthened by reinforcing the inner plate 23 by forming a complicated uneven shape on the inner plate 23 by the reinforcing convex portions 29a and the reinforcing concave portions 70 that intersect each other. can do.

  Next, FIG. 17 and FIG. 18 show a second embodiment of the present invention, which is basically the outer plate 21 for countermeasures against extreme heat in the embodiment shown in FIG. 1 to FIG. It is a side door 17 that does not have the honeycomb-shaped ventilation hole assembly portion 26 and the ventilation opening 30 of the inner side plate 23, and the joining portion 27 of the inner side plate 23 is bonded to the back surface of the outer side plate 21 with a large area. The strength is improved. On the other hand, other structures such as the reinforcing deformation portion 56 are the same as those in the embodiment shown in FIGS.

  The present invention can be used for a door panel of a work machine such as a hydraulic excavator shown in FIG.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 shows a first embodiment of a door panel according to the present invention, and is a perspective view of a first curved corner portion and a second curved corner portion having a concave curved surface formed on an inner plate. It is a perspective view which shows the curvature radius and center of a concave curved surface of a 1st step corner part same as the above. FIG. 3 is a reference diagram when the curvature radii of the concave curved surfaces of the first-stage corner portion and the second-stage corner portion are set to be equal for comparison with FIG. 2. It is an external view of a door panel same as the above. It is the VV sectional view taken on the line of FIG. It is an expanded sectional view of FIG. It is a perspective view of the outer surface side of a door panel same as the above. It is a perspective view of the inner surface side of a door panel same as the above. It is sectional drawing of the hemming process part of a door panel same as the above. It is an internal view of the hemming process part of a door panel same as the above. It is an expansion perspective view of the inner surface side of a door panel same as the above. It is a disassembled perspective view of a door panel same as the above. It is sectional drawing which shows the mounting process of the internal reinforcement board of a door panel same as the above, (a) is sectional drawing which positioned and adhered the internal reinforcement board in the inner side board, (b) is in the middle of the hemming process of an outer side board It is sectional drawing which positioned the inner side board and the internal reinforcement board in the peripheral part, (c) is sectional drawing which carried out the hemming process of the outer side board, and joined and fixed the inner side board and the internal reinforcement board. It is sectional drawing which shows the step-shaped reinforcement deformation | transformation part formed in the inner side board of a door panel same as the above. FIG. 15 is a reference diagram showing a case where there is no step-shaped reinforcing deformation portion for comparison with FIG. 14. It is a top view of the working machine provided with the door panel same as the above. It is a perspective view of the outer surface side which shows 2nd Embodiment of the door panel which concerns on this invention. It is a perspective view of the inner surface side of a door panel same as the above. It is a perspective view which shows the outline | summary of a working machine.

Explanation of symbols

21 Outer plate
22 space
23 Inner plate
27 Joint
29 Convex
56 Reinforced deformation
61 1st stage corner
62 2nd stage corner R, r Radius of curvature of concave surface P61, P62 Center of concave surface

Claims (2)

An outer plate,
An inner plate fixed to the inner surface of the outer plate and forming a space with the outer plate;
The inner plate
A concave joint closely attached to the outer plate;
A bulge formed with respect to the joint, and
A reinforcing deformation part formed in a step shape in the middle part of the bulging direction of the convex part,
The convex part has a concave curved first stage corner part located on the joint part side from the reinforcing deformation part, and a concave curved second stage corner part formed through the reinforcing deformation part,
Reinforcement deformation part was formed in the narrowest part between the concave curved surface of each corner part so that the concave curved surface of the 1st step corner part and the concave curved surface of the 2nd stage corner part may approach without passing through a plane part. A door panel featuring. The radius of curvature of the concave curved surface of the second stage corner is set larger than the radius of curvature of the concave curved surface of the first stage corner,
2. The door panel according to claim 1, wherein the center of the concave curved surface of the second stage corner is positioned inside the corner from the center of the concave curved surface of the first stage corner.

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