JP2019038024A - Tubular component and method for forming tubular component - Google Patents

Abstract

Provided is a tubular part that can prevent the positional deviation between both end faces that face each other and improve the positioning accuracy.
The present invention relates to a tubular part which is formed into a tubular shape by abutting both end faces located on opposite sides of a plate-like member, and the abutted both end faces are arranged in a thickness direction or a length direction or Positioning engagement portions 2A and 2B that engage with each other to position in both directions are provided on the both end faces.
[Selection] Figure 2

Description

  The present invention relates to a tubular part obtained by forming a plate-like member into a tubular shape, and a method for forming the tubular part.

  As a method for forming a plate-like member into a tubular shape, for example, a so-called UO bending method is known in which a plate-like member is bent into a U shape using a press die, and then the formed product is bent into a tubular shape such as an O-shape. (See Patent Document 1 below).

  Generally, in such a forming method, first, as shown in FIGS. 22A and 22B, a flat metal plate 100 is set in a press mold 200, and the upper plate 201 and the lower die 202 are used to form a metal plate. Bending into a U shape by pressing 100. Next, as shown in FIGS. 22C and 22D, the molded product (metal plate 100) formed into a U-shape is set in another press die 300 and pressed by the upper die 301 and the lower die 302. Thus, a pair of vertical wall portions 100a of the U-shaped molded product is bent, and a tubular part such as an O-shape is formed so that the respective end portions 100b abut each other.

Japanese Patent Laid-Open No. 2006-59938

  By the way, the tubular parts as described above include cross-sectional shapes that change in the length direction, two-dimensional bending molded products that are bent in one direction orthogonal to the length direction, and further in the length direction. A variety of shapes have been proposed depending on the application, such as a three-dimensional bent product bent in two directions perpendicular to each other.

  However, when the shape is complicated, the positions of both end surfaces of the tubular component that are brought into contact with each other may be shifted in the thickness direction due to deviations in the bending degree of the left and right of the tubular component, or {FIG. 23A: Thickness May be shifted in the length direction {FIG. 23B: refer to the shift β in the length direction}. The occurrence of such a shift leads to a deterioration in quality such as welding performed thereafter, and therefore an additional process such as eliminating a step between both end faces is necessary.

  Then, an object of this invention is to prevent the position shift of the both end surfaces where a tubular component is faced | matched mutually.

  In order to solve the above-described problems, the present invention provides a tubular component formed into a tubular shape by abutting both end surfaces located on opposite sides of a plate-like member, wherein the abutted both end surfaces are formed in a thickness direction or a length. Provided is a tubular component in which positioning engaging portions that engage with each other for positioning in the lateral direction or both directions are provided on the both end faces.

  In addition to the case where the both end surfaces are in contact with each other, the “abutted both end surfaces” are in a state where there is a gap between the both end surfaces and do not approach each other (non-contact state). This includes cases where

  As described above, the positioning engagement portions engage with each other, so that both end faces that are abutted with each other can be positioned in the thickness direction or the length direction, or in both directions, thus preventing misalignment between both end faces. It is possible to improve the alignment accuracy.

  Further, in order to solve the above-mentioned problems, the present invention is a molding method in which a plate-shaped member is bent by a press mold and a tubular part is molded by abutting both end surfaces located on opposite sides of the plate-shaped member. When the plate-like member is bent and the both end faces are brought into contact with each other, the positioning engagement portions provided on the both end faces are engaged with each other so that the both end faces are in the thickness direction or length. A method of forming a tubular part that is positioned in one or both directions is provided.

  As described above, when the both end surfaces of the plate-shaped member are brought into contact with each other, the positioning engagement portions provided on the both end surfaces are engaged with each other, thereby positioning the both end surfaces in the thickness direction or the length direction or in both these directions. can do.

  Furthermore, when bending the plate-shaped member, the positioning engagement portions may be brought into contact with the press molds to correct the positional deviation in the length direction of the both end faces.

  In this way, by correcting the displacement by abutting against the press die during bending of the plate-like member, the subsequent positioning engagement portions can be more reliably engaged with each other, and the alignment accuracy is further increased. improves.

  ADVANTAGE OF THE INVENTION According to this invention, the position shift of the both end surfaces where a tubular component is mutually faced can be prevented, and the alignment precision between both end surfaces can be improved.

BRIEF DESCRIPTION OF THE DRAWINGS It is a figure which shows the tubular component which concerns on one Embodiment of this invention, Comprising: (A) is a perspective view of a tubular component, (B) is the top view which looked at the tubular component from the upper direction, (C) is a horizontal direction of a tubular component It is the side view seen from. It is an enlarged view of the butting | matching part of the tubular component which concerns on this embodiment. It is an enlarged view which shows the state which isolate | separated the butt | matching part. It is a figure which shows an example of the formation method of a positioning engagement part. (A), (B) is a figure which shows the procedure of a U bending process. (A)-(D) are figures which show the procedure of an intermediate | middle bending process. (A)-(C) are figures which show the procedure of the last bending process. It is a figure for demonstrating position shift correction by a positioning engagement part. It is a figure which shows the example which correct | amends position shift only to one direction. It is a figure which shows the modification of a positioning engagement part. It is a figure which shows the other modification of a positioning engagement part. It is a figure which shows the example in the case of forming a positioning engagement part in a U-shaped molded product. It is a figure which shows the example in the case of forming a positioning engagement part at the time of intermediate | middle bending molding. It is a perspective view of the tubular component which concerns on other embodiment of this invention. It is an enlarged view which shows the state which isolate | separated the butt | matching part. It is a figure for demonstrating position shift correction by a positioning engagement part. It is a figure which shows the example which correct | amends position shift only to one direction. (A) (B) is a figure which shows the example in the case of abutting a positioning engagement part on a metal mold | die, and correct | amending a position shift, Comprising: (B) is a YY cross-sectional arrow view of (A). It is a figure which shows the modification of a positioning engagement part. It is a figure which shows the other modification of a positioning engagement part. It is a figure which shows the tubular component which concerns on another embodiment of this invention, Comprising: It is an enlarged view which shows the state which isolate | separated the butt | matching part. (A)-(D) are figures which show the general UO bending method. (A) is a figure which shows the state from which the position of the both end surfaces where a tubular component mutually face | matches shifted | deviated to the thickness direction, (B) is a figure which shows the state which the position of the said both end surfaces shifted | deviated to the length direction. .

  Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.

  FIG. 1 shows a tubular part according to an embodiment of the present invention. 1A is a perspective view of a tubular component, FIG. 1B is a plan view of the tubular component viewed from above, and FIG. 1C is a side view of the tubular component viewed from the lateral direction.

  The tubular part 1 shown in FIG. 1 is formed by bending a single metal plate-like member and butting both ends of the plate-like member located on opposite sides to face each other. Therefore, the tubular part 1 is formed with a linear butting portion 1c in which both end faces of the plate-like member are butted together in the length direction thereof. In FIG. 1, the two end faces that are abutted are in contact with each other, but there may be a case where there is a gap between the two end faces so that they do not approach each other (non-contact state). . The tubular part 1 is formed so as to change from a substantially square cross-sectional shape to a flat, substantially rectangular cross-sectional shape from one end 1a in the length direction to the other end 1b. Further, the tubular part 1 is formed into a three-dimensional bent shape that is bent in two directions (longitudinal direction and lateral direction) orthogonal to the longitudinal direction.

  FIG. 2 is an enlarged view of the butted portion of the tubular part according to the present embodiment, and FIG. 3 is an enlarged view showing a state where the butted portion is separated.

  As shown in FIGS. 2 and 3, in the tubular component 1 according to the present embodiment, the positioning engagement portions 2 </ b> A and 2 </ b> B that engage with each other at both end surfaces (hereinafter referred to as “mating surfaces”) that are abutted with each other. Is provided. As shown in FIG. 3, the positioning engagement portion 2 </ b> A provided on one mating surface is composed of a triangular convex portion 3 continuous in the length direction, and the positioning member provided on the other mating surface. The joint portion 2B is composed of a triangular concave portion 4 that continues in the length direction.

  Each positioning engagement part 2A, 2B can be formed at the stage of a flat plate material (blank material) before the plate-like member is formed into a tubular shape, for example. Specifically, as shown in FIG. 4, a convex positioning engagement portion 2 </ b> A is formed by crushing one end portion (one mating surface) of the plate-like member 5 with a tool or a press machine from above and below. The concave positioning engagement portion 2B can be formed by pressing a pointed punch or the like against the opposite end surface (the other mating surface) of the plate-like member 5.

Subsequently, a method for molding a tubular part according to the present embodiment and a mold apparatus (press mold) used for the molding will be described.
Here, the tubular parts according to the present embodiment have different cross-sectional shapes in the length direction, but the behavior of bending deformation in each cross section is basically the same, so that bending deformation in some cross sections is performed. Explained as an example.

  First, the U-bending process which shape | molds the plate-shaped member 5 (blank material) in a U shape using the U-bending die apparatus 6 shown in FIG. 5 is performed. At this time, positioning engagement portions 2A and 2B are formed in advance on both mating surfaces of the plate-like member 5. The U-bending mold apparatus 6 includes an upper mold 7 that can be moved up and down and a fixed lower mold 8. The lower mold 8 is formed with a U-shaped recess 8a.

  In the U-bending step, the plate-shaped member 5 is set on the lower mold 8 {see FIG. 5A}, and the upper mold 7 is lowered {see FIG. 5B}. Thereby, the plate-shaped member 5 is pressed by the upper mold | type 7 and the lower mold | type 8, and the U-shaped molded product of a cross-sectional substantially U shape is obtained.

  Next, using the intermediate bending die apparatus 9 shown in FIG. 6, an intermediate bending process for forming a U-shaped product into a predetermined intermediate bending product is performed. The intermediate bending mold apparatus 9 includes an upper mold 10 that can be raised and lowered, and a fixed lower mold 11. The upper mold 10 includes a pair of inclined surfaces 10a inclined in a direction approaching each other upward, a locking portion 10b protruding downward from between the upper ends of the pair of inclined surfaces 10a, and lower ends of the pair of inclined surfaces 10a. And a molding surface 10c smoothly continuous downward. The locking portion 10b has a locking surface 10d that extends downward from the upper end of each inclined surface 10a. In this embodiment, although the latching | locking part 10b is comprised separately from the main-body part of the upper mold | type 10, it may be comprised integrally. The lower mold 11 is formed with a concave portion 11a having the same shape as the bent portion (bottom portion) of the U-shaped plate-like member 5.

  In the intermediate bending step, first, as shown in FIG. 6 (A), the plate-like member 5 (U-shaped product) formed in the substantially U-shaped cross section is set in the concave portion 11a of the lower mold 11. Then, as shown in FIG. 6B, the upper mold 10 is lowered. At this time, the end portions (both mating surfaces) of the pair of vertical wall portions 5a of the plate-like member 5 are guided along the inclined surface 10a of the upper mold 10 so that the pair of vertical wall portions 5a are inclined inward. Then, both the mating surfaces abut against the locking portions 10b (a pair of locking surfaces 10d) of the upper mold 10. Then, as shown in FIG. 6C, when the upper mold 10 is further lowered, buckling occurs due to the compressive load acting on the pair of vertical wall portions 5a in the length direction, and each vertical wall portion The middle part of 5a bulges outward. Then, as shown in FIG. 5D, when the upper die 10 is further lowered, the bulging portion of each vertical wall portion 5a is pressed against the molding surface 10c of the upper die 10, and the middle of each vertical wall portion 5a. An intermediate bent portion 5b is formed in the portion. In this way, an intermediate molded product is molded.

  Finally, a final bending step of forming the intermediate molded product into a tubular shape is performed using the final bending die apparatus 12 shown in FIG. The final bending mold apparatus 12 includes an upper mold 13 that can be raised and lowered, and a fixed lower mold 14. The upper mold 13 and the lower mold 14 are formed with recesses 13a and 14a, respectively.

  In the final bending step, first, as shown in FIG. 7A, the plate-like member 5 (intermediate molded product) molded in the intermediate bending shape is set in the concave portion 14a of the lower mold 14. And as shown in FIG.7 (B), the intermediate bending part 5b of each vertical wall part 5a is further bent by dropping the upper mold | type 10. As shown in FIG. Thereafter, as shown in FIG. 7 (C), the upper mold 10 is further lowered and clamped so that the mating surfaces of the plate-like members 5 are brought into contact with each other. And pressed against the lower mold 14. As a result, a tubular part having a desired cross-sectional shape is formed.

  Here, as shown in the enlarged views of FIGS. 7B and 7C, when the mating surfaces of the plate-like member 5 are abutted with each other, the positioning engagement portions 2A and 2B provided on the mating surfaces are Engage with each other. As described above, the positioning engagement portions 2A and AB are engaged with each other, thereby preventing the displacement of the mating surfaces in the thickness direction. In particular, in the tubular part molded into a three-dimensional bent shape as in the present embodiment, the way of bending is different between the left part and the right part with the butting part 1c (see FIG. 1) as a boundary. Left and right deviation occurs. As a result, when the tubular part is taken out from the mold, the mating surface may be displaced in the thickness direction by the spring back {see FIG. 23A}. However, in the tubular component according to the present embodiment, the positioning engagement portions are engaged with each other, so that the displacement in the thickness direction can be prevented, and the alignment accuracy between the mating surfaces is improved. Thereby, even if it does not perform the additional process which eliminates the level | step difference between mating surfaces, welding of mating surfaces can be performed favorably and it becomes possible to reduce a manufacturing man-hour and cost.

  Moreover, in this embodiment, since each positioning engaging part is formed in the triangle shape, these can function as a guide part which correct | amends the position shift of a mating surface. That is, as shown in FIG. 8, each positioning engagement portion 2A, 2B has inclined surfaces 2a1, 2b1 that are inclined with respect to the abutting directions X1, X2 when viewed from a cross-sectional direction orthogonal to the length direction. Thus, when the mating surfaces are abutted with each other, the inclined surfaces 2a1 and 2b1 of the positioning engagement portions 2A and 2B come into contact with each other, so that the mating surfaces are guided to a desired position, and the displacement in the thickness direction is shifted. It can be corrected. Thereby, even if the thickness direction shift | offset | difference arises between mating surfaces when bending a plate-shaped member, the shift | offset | difference can be correct | amended and a positioning engagement part can be engaged reliably.

  Moreover, in the present embodiment, each positioning engagement portion has two inclined surfaces that face in different directions, so that the misalignment between the mating surfaces is either in the thickness direction or in the opposite direction. Even if it occurs in the direction, the positional deviation can be corrected. Further, when the positional deviation direction is determined in one direction, each positioning engagement portion 2A, 2B may have one inclined surface 2a1, 2b1, respectively, as in the example shown in FIG.

  In addition, the shape of the positioning engagement portion is not limited to a triangular shape, and may be positioning engagement portions 2A and 2B including convex and concave portions such as semicircular shapes as shown in FIG. Further, when the guide function by the inclined surface is not necessary, positioning engaging portions 2A and 2B including a quadrangular convex portion and a concave portion as shown in FIG. 11 may be used.

  In the molding method described above, the positioning engagement portion is formed at the blank material stage, but may be performed during the tubular component molding process. For example, as shown in FIG. 12, at the stage where a U-shaped molded product is formed, the positioning engagement portion 2A is pressed by pressing a tool or the like against the tip surfaces (mating surfaces) of the pair of vertical wall portions 5a of the U-shaped molded product. , 2B may be formed. Further, as shown in FIG. 13, protrusions 10e are provided on a mold for intermediate bending (in the example shown, the locking portion 10b of the upper mold 10), and each protrusion 10e is shaped like a plate during the intermediate bending process. The positioning engagement portions 2A and 2B may be formed by pressing the mating surfaces of the member 5 against each other.

  14 and 15 show a tubular part according to another embodiment of the present invention.

  The tubular part 1 shown in FIGS. 14 and 15 is different from the tubular parts shown in FIGS. 1 and 2 and the like in the configuration of the positioning engagement portions 2A and 2B. Other than that, it is the same structure. Specifically, in the present embodiment shown in FIGS. 14 and 15, the positioning engaging portions 2 </ b> A and 2 </ b> B are formed in a triangular shape when viewed from above the tubular part 1. That is, in the present embodiment, each positioning engagement portion 2A, 2B is formed by changing the ridgeline of the mating surface into a triangular shape over the length direction, whereas the above-described FIGS. In the embodiment shown in FIG. 4, the positioning engaging portions 2A and 2B are different in that the ridge lines of the mating surfaces are formed in a triangular shape over the thickness direction. In the present embodiment shown in FIGS. 14 and 15, the positioning engagement portions 2 </ b> A and 2 </ b> B are intermittently provided in the length direction, but are provided so as to be continuously arranged in the length direction. May be.

  By providing such a positioning engagement portion, it is possible to prevent the displacement of the mating surfaces in the length direction by engaging the positioning engagement portions. In particular, in a tubular part formed in a three-dimensional bent shape as in this embodiment, a deviation in the length direction between the mating surfaces {see FIG. 23B} occurs due to a lateral deviation in the degree of bending. It tends to occur. Accordingly, the positioning engaging portions 2A and 2B as shown in FIGS. 14 and 15 are formed, and when the mating surfaces are abutted with each other, the positioning engaging portions 2A and 2B are engaged with each other, thereby This makes it possible to prevent displacement in the length direction. Note that the method for molding the tubular part and the mold for molding in the present embodiment are basically the same as the method and the mold according to the above-described embodiment, and thus description thereof is omitted. Moreover, the timing which forms a positioning engaging part in a plate-shaped member may be performed in the stage of a blank material, and may be performed in the middle of the formation process of a tubular component.

  Also in the present embodiment, each positioning engagement portion is formed in a triangular shape, so that the positioning engagement portion can function as a guide portion that corrects the positional deviation between the mating surfaces. That is, as shown in FIG. 16, since the positioning engaging portions 2A and 2B have inclined surfaces 2a1 and 2b1 that are inclined with respect to the abutting direction X1 and X2 as viewed from above, the mating surfaces are abutted. When they are aligned, the inclined surfaces 2a1 and 2b1 of the positioning engaging portions 2A and 2B come into contact with each other, whereby the mating surfaces are guided to a desired position, and the displacement in the length direction can be corrected. As a result, even when a deviation in the length direction occurs between the mating surfaces when the plate-shaped member is bent, the deviation can be corrected and the positioning engagement portions can be reliably engaged.

  Furthermore, in the present embodiment, each positioning engagement portion has two inclined surfaces that are directed in different directions, so that the misalignment between the mating surfaces occurs in one of the length directions or in the opposite direction. Even so, the positional deviation can be corrected. Further, when the positional deviation direction is determined in one direction, each positioning engagement portion 2A, 2B may have one inclined surface 2a1, 2b1, respectively, as in the example shown in FIG.

  Further, the positional deviation correction in the length direction is not limited to the case where the inclined surfaces 2a1, 2b1 are in contact with each other as described above, but may be performed by bringing the inclined surfaces 2a1, 2b1 into contact with the mold. For example, as shown in FIG. 18, guide surfaces 10 f and 10 g that are inclined with respect to the abutting directions X <b> 1 and X <b> 2 are provided on the locking portion 10 b of the upper mold 10 for intermediate bending and the like during the intermediate bending process. By causing the inclined surfaces 2a1 and 2b1 of the positioning engagement portions 2A and 2B to abut against the guide surfaces 10f and 10g, it is possible to correct the positional deviation in the length direction between the mating surfaces. In particular, misalignment in the length direction tends to occur significantly when the plate-like member is greatly bent, so that the misalignment in the length direction is corrected during the intermediate bending process as shown in FIG. By doing so, subsequent positioning engagement portions 2A and 2B can be more reliably engaged with each other, and the alignment accuracy is further improved.

  Also in this embodiment, the shape of the positioning engagement portion is not limited to a triangular shape. For example, a curved shape such as a semicircular shape as shown in FIG. 19 or a rectangular shape as shown in FIG.

  In each of the above-described embodiments, the configuration in which one of the thickness direction and the length direction is positioned by the positioning engagement portion has been described. However, as in the embodiment shown in FIG. 21, the positioning engagement portions 2A and 2B. It is possible to perform positioning in both the thickness direction and the length direction by constituting the convex portion and the concave portion in a quadrangular pyramid shape. Further, the positioning engagement portion may be formed in a triangular pyramid shape or a conical shape. In short, the positioning engagement portions 2A and 2B may be formed by changing the ridgeline of the mating surface in both the thickness direction and the length direction. Further, in this case, the four inclined surfaces provided in the positioning engaging portions 2A and 2B function as guide surfaces for correcting the displacement, thereby correcting the displacement in both the thickness direction and the length direction. be able to. In addition, when the guide function by an inclined surface is unnecessary, you may form a positioning engagement part in shapes, such as a quadratic prism shape, a triangular prism shape, or a column shape.

  As described above with respect to the embodiments of the present invention, by providing the positioning engagement portions that engage with each other on the mating surfaces of the tubular parts, the misalignment between the mating surfaces can be prevented, and the alignment accuracy is improved. Can be made. In particular, in addition to the change in cross-sectional shape over the length direction, in tubular parts formed in a three-dimensional bending shape, the misalignment between the mating surfaces tends to occur easily in the thickness direction or the length direction. Therefore, a great effect can be expected by applying the configuration and the molding method according to the present invention. For example, the present invention can be applied to tubular parts such as left and right trailing arms of a rear suspension of an automobile and an intermediate beam connecting them. In addition, the positioning engagement part should just be provided only in the position shift location specified by experiment or simulation.

  Further, the present invention is not limited to such a tubular part, but can be applied to a tubular part whose cross-sectional shape does not change in the length direction and a straight tubular part that is not bent in the length direction. It is. Even in a tubular part having such a configuration, the misalignment of the mating surfaces may occur due to variations in material strength, etc., so that a certain effect is expected by applying the present invention.

DESCRIPTION OF SYMBOLS 1 Tubular component 2A Positioning engagement part 2B Positioning engagement part 2a1 Inclined surface 2b1 Inclined surface 5 Plate-shaped member 6 U bending mold apparatus 9 Intermediate bending mold apparatus 12 Final bending mold apparatus

Claims (2)

Tubular parts formed into a tubular shape by butting both end faces located on opposite sides of the plate-shaped member,
A tubular part characterized in that positioning end portions that engage with each other in order to position the abutted both end surfaces in the thickness direction or the length direction or in both directions are provided on the both end surfaces. A molding method for bending a plate-like member by a press die and molding a tubular part by abutting both end faces located on opposite sides of the plate-like member,
When bending the plate-shaped member and abutting the both end surfaces with each other, the positioning engagement portions provided on the both end surfaces are engaged with each other so that the both end surfaces are in the thickness direction or the length direction or those A method for forming a tubular part, characterized by positioning in both directions.

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