JP2011083807A - Method for manufacturing component having hat-shaped cross section - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a method for manufacturing a component having a hat-shaped cross section, in which bead parts are press-formed on both right and left vertical walls of the component having a hat-shaped cross section and further a die is surely drawn out after press-forming at a low cost. <P>SOLUTION: A press die is used, which includes: an upper die 41 and a lower die 42, which are mutually die-closed; and a pair of sliding dies 44, 44, which are fitted on both sides in the width direction of the upper die 41 via cam mechanisms 43, 43 and approach each other with operation of die-closing. Further, the lower die 42 is split into: a center die 45; and a pair of split dies 47, 47, which are fitted on both sides in the width direction of the center die 45 via a cam mechanism 46 and are separated from each other with operation of die-closing. The parts corresponding to each vertical walls 12, 12 of an intermediate before forming bead parts 13 are pressed respectively with the sliding dies 44, 44 and the split dies 47, 47 by operation of die-closing of the press die, so that bead parts 13, 13 are formed. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a method for manufacturing a cross-sectional hat-shaped component, and more particularly to a technique for press-molding a reinforcing bead portion on a pair of vertical wall portions of a cross-sectional hat-shaped component.

  In recent years, the application of high-strength steel sheets called high-tensile materials or ultra-high-tensile materials to car body structural parts has begun to be studied in order to improve the safety of automobiles and reduce the environmental burden by reducing weight. However, this type of steel sheet is generally expensive and has high workability due to its high rigidity. Therefore, the present situation is that the application of the steel sheet remains in a limited range.

  For example, in the hollow columnar parts constituting the body frame, or in the cross-sectional hat-shaped parts that are the main parts of these hollow columnar parts, it is known that the collision characteristics are improved by increasing the number of ridge lines in the cross section of the parts. (For example, see Non-Patent Document 1 below). Therefore, in the case of a hat-shaped part in cross section, the impact performance can be improved by providing appropriate irregularities on the wall portion. For example, it is considered preferable that groove-shaped bead portions are formed along the longitudinal direction on the vertical wall portions on both the left and right sides of the cross-sectional hat-shaped component.

  As a method for manufacturing the cross-sectional hat-shaped part having the above-mentioned shape, press molding is conceivable from the viewpoint of productivity and cost. Here, for example, in Patent Document 1 below, a slide cam provided with a bend blade at one end thereof is slid from the side of the work, and the turn has a bend part for forming a negative angle part of the work. There is disclosed a press molding method for an automotive panel in which a cam is rotated to form a negative angle portion of a workpiece with a bending blade and a bent portion. Further, a slide body that rotates together with the rotation cam is provided on the bent portion side of the rotation cam so as to be slidable in the vertical direction. After the formation of the negative angle portion is completed, the slide body is moved to the rotation cam. As a result, the negative cam forming part (bending part) of the rotary cam is removed from the inside of the work by rotating the rotary cam in the opposite direction to the negative angle molding. Yes.

  For example, in Patent Document 2 below, a workpiece is set by providing a relief portion between a lower punch and an upper die pad, and the cam driver is lowered downward on the slope of the cam base. A method of forming a press work is disclosed in which a protruding part of a cam slide is pressed against a bending part of a work and bent. In addition, the work is taken out of the punch (ie, die-cut) by rotating the work halfway around the bending part side.

JP 2009-113078 A JP-A-60-1557025

“Characteristics of Cold Press, Roll Form, and Hot Stamp Method in Manufacturing Ultra-High Strength Body Parts” Automobile Technical Society Preliminary Preprint No.15-09, p.1 to p.5, May 2009

  As described above, the molding methods disclosed in the above-mentioned patent documents all relate to a technique for press-molding a part having a complicated cross-sectional shape such as a pillar or a member, particularly a negative corner portion. However, in order to improve the strength of cross-sectional hat-shaped parts such as pillars and members, when considering the formation of the bead portions on the left and right vertical wall portions, for example, the press method disclosed in Patent Document 1 is applied as it is. Therefore, the bead portion can be formed only on one vertical wall portion by the rotating cam. Further, depending on the size ratio of the bead portion in the cross-sectional hat-shaped part, there is a possibility that the rotating cam cannot be removed from the workpiece. Similarly, when the press method disclosed in Patent Document 2 is applied, when the bead portion is formed on both vertical wall portions, the workpiece interferes with either the left or right bead portion forming member. It cannot be half-turned and is difficult to remove.

  Further, in the pressing method of the above-mentioned Patent Document 1, in addition to the driving means for the upper and lower mold clamping operations, at least the rotating means of the rotating cam is required separately, so the structure of the press mold becomes complicated and large, There is a problem of increasing capital investment. Similarly, the pressing method of Patent Document 2 also requires a separate means for rotating the workpiece in addition to the driving means for the mold clamping operation, which causes an increase in equipment cost.

  In view of the above circumstances, in this specification, with simple equipment, the bead portion is press-molded on both the left and right vertical wall portions of the cross-sectional hat-shaped component, and die-cutting after press molding is performed reliably and at low cost. It is a technical problem to be solved by the present invention to provide a method for manufacturing a cross-sectional hat-shaped part that can be manufactured.

  The present invention has been made to solve the above problems. That is, the method for manufacturing a cross-sectional hat-shaped part according to the present invention includes a top wall portion, a pair of vertical wall portions connected to the top wall portion and both sides in the width direction thereof, and the pair of vertical wall portions in the longitudinal direction. A cross-sectional hat-shaped part manufacturing method in which a groove-shaped bead portion is formed along the upper die and the lower die, which can be clamped to each other, and attached to both sides in the width direction of the upper die via cam mechanisms. And a pair of slide molds that come close to each other in accordance with the mold clamping operation, and the lower mold is attached to the central mold and both sides in the width direction of the central mold via cam mechanisms, and separated from each other in accordance with the mold clamping operation. Using a press die divided into a pair of split dies, the portion corresponding to each vertical wall portion of the intermediate molded body before forming the bead portion by the press die clamping operation is divided into a slide die and a split die, respectively. Press to mold the bead part, The slide type causes spaced apart from each other, characterized with a point so as to approach each other to split up a position which does not interfere with the bead portion and the die cutting direction.

  As described above, in the present invention, the pair of slide molds attached to the upper mold via the cam mechanism are brought close to each other by the mold clamping operation, and the pair of slide molds attached to the lower mold central mold via the cam mechanism are also used. Since the bead portions are press-molded by separating the divided dies from each other, the bead portions can be formed on both vertical wall portions only by the mold clamping operation. In addition, the mold opening operation after forming the bead part allows the slide mold attached to the upper mold to be separated from each other, and the divided mold attached to the lower mold is brought close to each other, so that the mold can be removed from the bead part. Thus, the workpiece formed with the bead portion can be reliably extracted (demolded) from the lower mold only by the mold opening operation. Accordingly, it is possible to manufacture a cross-sectional hat-shaped component in which die cutting is reliably performed and bead portions are provided on both the left and right vertical wall portions (having a shape excellent in collision characteristics). In addition, since the above-described method requires only a driving means for the mold clamping operation, the press die can be simplified and the equipment cost can be simplified without separately providing a driving means for die cutting as in the prior art. In addition, the processing cost can be reduced. Of course, since the molding of the bead portion and the demolding of the molded product can be performed only by the mold clamping and mold opening operations, the cycle time can be shortened and high productivity can be exhibited.

  Further, at the time of mold clamping, a groove-shaped bead portion may be press-molded along the longitudinal direction in a portion corresponding to the top wall portion of the intermediate molded body.

  In this way, not only the left and right vertical wall portions, but also the top wall portion connected to the vertical wall portions on both sides in the width direction is press-molded to further reinforce the collision characteristics of the hat-shaped cross section. it can.

  In addition, when the bead portion is formed on the top wall portion as described above, the bead portion is provided along with the mold opening operation on both sides in the width direction of the bead portion provided in the portion corresponding to the top wall portion in the state where the mold clamping is completed. You may make it leave the space | interval which can make a pair of division | segmentation type | mold approach each other to the position which does not interfere with.

  When the bead portion is formed in the portion corresponding to the top wall portion as described above, the bead portion is naturally formed during the mold clamping operation. Therefore, when the mold is opened, even if the divided dies are brought close to each other for die cutting, the bead portion formed in the portion corresponding to the top wall portion may hinder the approaching operation. In this regard, if a gap is provided at the above position, even if the bead portion is formed in the portion corresponding to the top wall portion, the subsequent division type approaching operation can be performed without delay, and the division type The workpiece can be reliably taken out from the machine. Further, if a gap is provided at the above position, for example, an upper protruding portion 47c that protrudes upward is provided on the outer side in the width direction of the split mold 47 (see FIG. 2 described later), and the upper protruding portion 47c Even if the corner portion (see FIG. 5 to be described later) between the top wall portion 11 and the vertical wall portion 12 is press-formed from the inside, it is possible to reliably take out the workpiece from the divided mold 47 thereafter.

  As described above, according to the manufacturing method of the present invention, with simple equipment, the bead portions are press-molded on the left and right vertical wall portions of the cross-sectional hat-shaped component, and die removal after press molding is reliably and lowly performed. Can be done to cost.

  Moreover, if it is the manufacturing method which concerns on this invention, a bead part can be press-molded by the approach operation | movement of a slide type | mold accompanying a mold clamping operation | movement. Therefore, it is possible to obtain a vertical wall portion having a bead portion only in a part in the longitudinal direction, and thus a cross-sectional hat-shaped component. The present invention is also applied to a structural component of an automobile having a complicated three-dimensional shape at a low cost. Parts can be mass-produced. Of course, if the collision performance is improved, the plate thickness can be reduced, and the weight can be reduced accordingly. Or since the grade of the material (metal plate etc.) to be used can be lowered | hung, the reduction of manufacturing cost can also be aimed at by this.

It is a figure for demonstrating the outline | summary of the manufacturing method of the cross-sectional hat-shaped component which concerns on one Embodiment of this invention, Comprising: With sectional drawing of the press die used for the process of forming the intermediate molded object before shape | molding a bead part. is there. It is sectional drawing of the press die used for the process of shape | molding a bead part in an intermediate molded object. FIG. 3 is a cross-sectional view of the press die in a state in which the left and right split dies of the lower die shown in FIG. 2 start sliding outward. FIG. 4 is a cross-sectional view of the press die in a state where the left and right slide dies provided on the upper die start to slide inward while the split-type slide operation shown in FIG. 3 is completed. It is sectional drawing of a press die in the state where mold clamping was completed and a bead part was fabricated. FIG. 6 is a cross-sectional view of the press die in a state where the slide die is slid outward by a predetermined amount from the state shown in FIG. 5 by a die opening operation. FIG. 5 is a cross-sectional view of a press die that is in a state where the sliding operation toward the outside of the slide die is completed, and the lower die is then slid in a direction approaching each other. FIG. 8 is a cross-sectional view of a cross-sectional hat-shaped part manufactured using the press mold shown in FIGS. 1 to 7 and a hollow columnar part including the hat-shaped part.

  Hereinafter, an embodiment of a method for producing a cross-sectional hat-shaped part according to the present invention will be described with reference to the drawings. Note that the “up and down” direction in the following description is simply defined according to the clamping direction of the press die in each drawing, and is only defined for easy understanding of the positional relationship between the components. . Therefore, it does not specify the installation direction or usage mode of the cross-sectional hat-shaped part or hollow columnar part described below in the vehicle body, the direction of assembly to other parts, or the like. The same applies to the directions of “heaven” and “bottom”.

  FIG. 8 shows a cross-sectional view of a cross-sectional hat-shaped component and a hollow columnar component including the hat-shaped component manufactured by the method for manufacturing a cross-sectional hat-shaped component according to an embodiment of the present invention. The cross-sectional hat-shaped component 10 shown in this figure includes a top wall portion 11, a pair of vertical wall portions 12 and 12 connected at both ends of the top wall portion 11 and its width direction (the left-right direction in FIG. 2). Yes. A bead portion 13 having a groove shape is formed along the longitudinal direction of the vertical wall portion 12 at an intermediate position in the vertical direction (the vertical direction in FIG. 2) of each vertical wall portion 12. Further, in this embodiment, a bead portion 14 having a groove shape is formed along the longitudinal direction of the top wall portion 11 at the intermediate position in the width direction of the top wall portion 11 in the same manner as described above. By adopting such a cross-sectional shape, the cross-sectional hat-shaped component 10 can be increased in strength and rigidity, and the impact characteristics can be improved. The cross-sectional hat-shaped component 10 having the above-described cross-sectional shape can be provided as a hollow columnar component 16 having a bottom wall portion 15 disposed on the lower opening side, for example, as shown in the illustrated example. In this case, as shown in FIG. 8, a bead portion 17 having a groove shape similar to the above can be formed along the longitudinal direction of the bottom wall portion 15 at an intermediate position in the width direction of the bottom wall portion 15. It is.

  For example, the hollow columnar component 16 having the above-described configuration is formed by separately forming the cross-sectional hat-shaped component 10 and the bottom wall portion 15, and then opening ends of both vertical wall portions 12 (on the side far from the top wall portion 11). The plate-like extended portion 12a provided at the end) and the plate-like extended portions 15a provided at the left and right ends of the bottom wall portion 15 are overlapped and fixed by, for example, spot welding, etc. It can be obtained by integrating the component 10 and the bottom wall 15. Therefore, in this embodiment, the hollow columnar component 16 includes both the step of forming the intermediate molded body before the bead portion 13 is formed, and clamping the intermediate molded body with a press die, The steps corresponding to the vertical wall portions 12 and 12 are pressed to form the bead portions 13 and 13, thereby forming the cross-sectional hat-shaped component 10, and the bottom wall formed separately from the cross-sectional hat-shaped component 10. It is manufactured through at least the step of integrating the portion 15. Hereinafter, the process for forming the cross-sectional hat-shaped part 10 of the hollow columnar part 16 will be described focusing on the molding aspect of the bead part 13 and the die-cutting aspect after the bead part 13 is molded.

  First, as shown in FIG. 1, the preform 20 is set between press dies 21 and 22 for molding the intermediate molded body, and the preform 20 is clamped to the preform 20. The intermediate molded body 30 having the shape shown in FIG. 2 is molded (intermediate molded body forming step).

  After obtaining the intermediate molded body 30 in this way, the intermediate molded body 30 is set at a predetermined position inside the press mold (upper mold 41 and lower mold 42) shown in FIG. Clamping is performed between the molds 42. Thereby, the bead part 13 of the cross-sectional hat-shaped component 10 shown in FIG. In this embodiment, the cross-sectional hat-shaped part 10 including the bead portion 13 is formed by press-clamping (formation process of the cross-sectional hat-shaped part).

  Here, the intermediate molded body 30 has a substantially hat-shaped cross section as shown in FIG. 2, and a portion 31 corresponding to the top wall portion 11 and a portion corresponding to the vertical wall portion 12 of the cross-section hat-shaped part 10. 32 and a plate-like extending portion 12a that is a connecting portion of the bottom wall portion 15 are integrally provided. Then, the intermediate molded body 30 is set so as to cover the main part of the lower mold 42 in a state where the plate-like extension part 12 a is in contact with the lower mold 42.

  The press die shown in FIG. 2 is for press-molding the intermediate molded body 30 including the bead portion 13. The press mold is attached to the upper mold 41 and the lower mold 42 that can be clamped to each other via the cam mechanism (slide cam mechanism 43) on both sides in the width direction of the upper mold 41, and approaches each other in accordance with the mold clamping operation. And a pair of slide molds 44, 44. The lower die 42 is attached to the central die 45 via a cam mechanism (slide cam mechanism 46) on both sides in the width direction of the central die 45, and a pair of split dies 47, 47 that are separated from each other in accordance with the clamping operation. It is divided into and.

  The pair of left and right slide molds 44 are attached to the upper mold 41 via the slide cam mechanism 43, and descend in synchronization with the upper mold 41 as the press mold is clamped. Then, after contacting the lower mold 42 and contacting the split mold 47 or the plate-like extending portion 12a of the intermediate molded body 30 set on the split mold 47 as shown in FIG. However, the upper mold 41, the split mold 47, and the intermediate molded body 30 continue to descend. In this way, the left and right slide molds 44 continue to descend together with the split mold 47, and when the split mold 47 reaches the lowest point, the inner side of the portion 32 corresponding to the vertical wall portion 12 as the upper mold 41 descends. The slide begins to move toward. Further, when the mold is opened, as the upper mold 41 is raised, before the split mold 47 starts to slide with respect to the central mold 45, the left and right slide molds 44 are separated from each other, in other words, from the vertical wall portion 12. The slide is started in a direction away from the outside, and ascending with the upper mold 41 is started when the slide is made outward by a predetermined amount. Note that the amount of outward sliding at this time depends on the direction of opening the mold with the cross-sectional hat-shaped component 10 (particularly the bead portion 13 formed on the vertical wall portion 12) as a molded product when the upper die 41 is raised integrally. The size is set so as not to interfere.

  The pair of left and right split dies 47 and 47 are attached to both sides in the width direction of the central die 45 via the slide cam mechanism 46 as with the slide die 44, and the slide dies 44 and 44 are clamped by a press die clamping operation. After that, the slide is started obliquely downward with respect to the central mold 45 and in a direction away from each other. Further, when the mold is opened, when the slide molds 44, 44 slide a predetermined amount outward in the width direction with respect to the upper mold 41, the slide is started obliquely upward with respect to the central mold 45 and in a direction approaching each other. It is like that. Note that the slide start time of the slide mold 44 or the slide start time of the split mold 47 can be adjusted, for example, by setting the cushion pressure (holding pressure) in the respective slide cam mechanisms 43 and 46 to a predetermined relationship. For example, by setting the cushion pressure in the slide cam mechanism 43 of the slide mold 44 to be larger than the cushion pressure in the slide cam mechanism 46 of the split mold 47, the slide start timing of the slide mold 44 during mold clamping is as described above. Can be set. Further, the slide start time of the split mold 47 when the mold is opened can be set as described above.

  A first molding surface 44 a for press-molding the bead portion 13 is provided on the inner surface of the slide mold 44 by pressing against the portion 32 corresponding to the vertical wall portion 12 of the intermediate molded body 30. Correspondingly, in order to press-mold the bead portion 13 into the portion 32 corresponding to each vertical wall portion 12 with the first molding surface 44a of the slide die 44 on the outer surface of each of the split dies 47, 47. The first molding surface 47a is provided. Further, while the bead portion 13 is press-molded by the first molding surfaces 44 a and 47 a in this way, the plate-like extension portion 12 a continuously provided on the opening side of the portion 32 corresponding to the vertical wall portion 12 is divided into the split mold 47. And the slide mold 44 are held in the clamping direction (see FIGS. 3 to 5 described later).

  A bead portion 14 (see FIG. 8) located at the center of the top wall portion 11 in the width direction is pressed on the lower surface of the upper die 41 by pressing against the portion 31 corresponding to the top wall portion 11 of the intermediate molded body 30. A first molding surface 41a for molding is provided. Correspondingly, the bead portion 14 is press-formed with the first molding surface 41 a of the upper die 41 on the upper surface of the central die 45 and the upper surfaces of the left and right split dies 47 constituting the lower die 42. A first molding surface 45a and a second molding surface 47b are provided. In this embodiment, only the side portion of the bead portion 14 is molded by the first molding surface 41 a provided in the upper mold 41.

  Corresponding to the above-described configuration of the upper mold 41, the intermediate molded body 30 is held on the upper outer sides of the divided molds 47 and 47, and a part of the top wall part 11 and a part of the vertical wall part 12 are held. The upper protrusions 47c and 47c are formed by pressing both corners including the upper die 41 with the upper die 41. As will be described later, the upper projecting portions 47c and 47c are formed on the vertical wall portion 12 in accordance with the press-opening operation of the press die, and then are moved to a position where they do not interfere with the bead portion 13 in the die cutting direction. It comes to approach.

  Hereinafter, a process of forming the cross-sectional hat-shaped component 10 having the bead portion 13 using the press mold (the upper mold 41, the lower mold 42, and the slide mold 44) having the above-described configuration will be described with reference to the drawings.

  First, as shown in FIG. 2, the mold clamping operation is started from the state where the upper mold 41 and the slide mold 44 are disposed above the lower mold 42 and the intermediate molded body 30 set on the lower mold 42, and the upper mold 41 And the slide mold 44 is lowered integrally. As shown in FIG. 3, when the slide mold 44 comes into contact with the plate-like extending portion 12 a of the intermediate molded body 30 set on the lower mold 42, the slide mold 44 and the intermediate mold are moved along with the lowering operation of the upper mold 41. As the body 30 descends integrally, the split mold 47 starts to slide in a direction obliquely downward with respect to the central mold 45 and away from each other.

  In this way, the left and right split dies 47, 47 are slid along with the clamping operation, and the split dies 47, 47 are in contact with the lowest point (the outwardly extending portion of the central die 45 and the clamping direction). 4), the left and right slide molds 44 and 44 hold the plate-like extending portion 12a between the split molds 47 and 47, as shown in FIG. The sliding is started toward the inside of the portion 32 corresponding to the vertical wall portion 12 of the intermediate molded body 30. At this time, the lower surface including the first molding surface 41a of the upper mold 41 is located above the portion 31 corresponding to the top wall portion 11 of the intermediate molded body 30 (the portion 31 corresponding to the top wall portion 11 and the portion 31). Are not in contact). And while pressing the 1st molding surface 44a provided in the inner surface of the slide type | mold 44 to the part 32 equivalent to the vertical wall part 12, this 1st molding surface 44a and the 1st molding surface 47a of the corresponding split mold 47, Then, the portion 32 corresponding to the vertical wall portion 12 is pushed and bent into a predetermined shape. Thereby, as shown in FIG. 5, the bead part 13 is press-molded in the part corresponded to both the vertical wall parts 12. FIG. In this embodiment, the entire vertical wall portion 12 including the bead portion 13 is press-molded with the slide die 44 and the split die 47, and the upper die 41 and the split die 47.

  At this time, as shown in FIGS. 4 and 5, the slide mold 44 is formed by the first molding surfaces 44 a and 47 a in a state where the plate-like extending portion 12 a of the intermediate molded body 30 is sandwiched between the split mold 47. Since the press molding is performed, it is possible to prevent the positional shift of the portion 32 corresponding to the vertical wall portion 12 and to accurately perform the press bending molding (press molding) of the bead portion 13. Of course, portions other than the bead portion 13 in the vertical wall portion 12 can also be press-molded with high accuracy while preventing the displacement.

  In this way, after the bead portion 13 is press-molded on the left and right vertical wall portions 12 by the slide die 44 and the split die 47, the upper die 41 is continuously lowered to form the first molding surface 41a provided on the lower surface thereof. Press against the portion 31 corresponding to the top wall 11. As a result, the bead portion 14 is formed at a portion corresponding to the top wall portion 11 between the first molding surface 41a of the upper mold 41, the first molding surface 45a of the corresponding central mold 45 and the second molding surface 47b of the split mold 47. Press molding (see FIG. 5). Note that the timing of pressing the upper die 41 is desirably at the time when the press molding of the bead portion 13 by the first molding surfaces 44a and 47a is completed or after that. In this embodiment, the top wall portion 11 including the bead portion 14 is press-molded by the upper die 41 and the central die 45, and the upper die 41 and the split die 47. Further, at this time, as shown in FIG. 5, the portion from the side portion of the bead portion 14 to the top wall portion 11 is formed only by the lower surface of the upper mold 41. Thereby, in the state where the mold clamping (press molding) is completed, the upper projecting portion 47c positioned above the second molding surface 47b of the split mold 47 and the side portion of the bead portion 14 positioned on the inner side in the width direction thereof. A gap 48 having a predetermined width is formed therebetween. In this embodiment, in order to make the above-described form easy and reliable, in the intermediate formed body 30 stage, as shown in FIG. 2, in the center in the width direction of the portion 31 corresponding to the top wall portion 11, A concave portion having a shape corresponding to the bead portion 14 to be finally formed is provided, and the bead portion 14 is formed on the intermediate molded body 30 provided with the concave portion.

  As described above, after forming the cross-sectional hat-shaped part 10 having the bead portions 13 on both the vertical wall portions 12 and 12 and the bead portion 14 on the top wall portion 11, the press die is opened. Then, the cross-sectional hat-shaped part 10 is taken out from the press die. Specifically, the upper mold 41 is moved upward by starting the mold opening operation from the state shown in FIG. When the predetermined amount of movement is reached, the left and right slide dies 44, 44 attached to the upper die 41 are slid in a direction away from the vertical wall portion 12. As shown in FIG. 6, when the slide mold 44 is slid to a position where the slide mold 44 and the vertical wall portion 12, particularly the bead portion 13 do not interfere with each other in the mold opening direction, the left and right split dies 47, 47 are It slides obliquely upward with respect to the central mold 45 and in a direction approaching each other, and is raised integrally with the slide molds 44 and 44 and the upper mold 41. Then, as shown in FIG. 7, when the split molds 47 and 47 are slid to a position where the split mold 47 and the bead portion 13 do not interfere with each other in the mold opening direction, the mold opening operation is further continued. The slide dies 44, 44 are separated from the split die 47 (the plate-like extending portion 12 a placed thereon) and retracted upward from the cross-sectional hat-shaped component 10. Thus, the cross-hat-shaped part 10 shown in FIG. 8 can be taken out from the press die while avoiding the bead portion 13 from interfering with the slide die 44 and the split die 47 in the die opening direction.

  As mentioned above, although one Embodiment of the manufacturing method of the cross-sectional hat-shaped component which concerns on this invention was described, this manufacturing method can take arbitrary forms within the scope of the present invention, without being limited to the form of the said illustration. .

  For example, in the above-described embodiment, the bead portion 13 is press-formed along the longitudinal direction of the vertical wall portion 12, but the shape and dimensions of the bead portion 13 are different from those of the first molding surface 44 a of the slide die 44 and the division. The first molding surface 47a of the mold 47 can be arbitrarily adjusted. Therefore, the bead portion 13 can be formed not only on the entire length in the longitudinal direction of the vertical wall portion 12 but also on a portion in the longitudinal direction. It is also easy to change the cross-sectional shape and the size of the bead portion 13 in the middle of the longitudinal direction. The same applies to the bead portion 14 formed on the top wall portion 11. Of course, since parts other than the bead portions 13 and 14 are also press-formed in principle, the cross-sectional shape or the outer dimension (cross-sectional area) can naturally be changed in the longitudinal direction.

  Further, the material or thickness of the intermediate molded body 30 (preliminary molded body 20) to be molded is not particularly limited as long as the bead portion 13 can be press-molded by pressing the slide mold 44 from the width direction. Of course. For example, regarding the steel plate, the production method according to the present invention is applied not only to a general soft steel plate but also to a high-strength steel plate called a so-called high-tensile material (340 MPa class or higher) or super high-tensile material (780 MPa class or higher). It is possible. Moreover, this manufacturing method is applicable also to metal plates (for example, aluminum, copper, etc. including a plating plate) other than a steel plate. Thus, the cross-sectional hat-shaped part 10 having the bead portion 13 from the intermediate molded body 30 (preliminary molded body 20) made of a metal plate having various materials and thicknesses, and thus the hollow columnar part provided with the cross-sectional hat-shaped part 10 16 can be manufactured, for example, it becomes possible to apply this invention to manufacture of various vehicle body structural components, such as a center pillar, a front pillar, a rocker, and a side member.

  Of course, other specific forms can be adopted for matters other than the above as long as the technical significance of the present invention is not lost.

DESCRIPTION OF SYMBOLS 10 Hat-shaped cross section 11 Top wall part 12,12 Vertical wall part 12a Plate-like extension part 13,13 Bead part (vertical wall part)
14 Bead part (top wall part)
DESCRIPTION OF SYMBOLS 15 Bottom wall part 16 Hollow columnar part 17 Bead part 20 Preliminarily molded body 21,22 Press mold 30 Intermediate molded body 31 Part equivalent to a top wall part 32 Part equivalent to a vertical wall part 41 Upper mold 42 Lower molds 43, 46 Slide Cam mechanisms 44, 44 Slide mold 44a First molding surface 45 Central mold 47, 47 Split mold 47a First molding surfaces 47c, 47c Upper protrusion 48 Clearance

Claims (3)

A cross section having a top wall portion and a pair of vertical wall portions connected to the top wall portion and both sides in the width direction, and a groove-shaped bead portion is formed along the longitudinal direction of the pair of vertical wall portions A method of manufacturing a hat-shaped part,
An upper mold and a lower mold that can be clamped to each other, and a pair of slide molds attached to both sides in the width direction of the upper mold via cam mechanisms and approaching each other in accordance with the mold clamping operation, and the lower mold Using a press die that is divided into a central die and a pair of split dies that are attached to both sides in the width direction of the central die via cam mechanisms and are separated from each other in accordance with a clamping operation.
The bead portion is formed by pressing the portions corresponding to the vertical wall portions of the intermediate molded body before the bead portion is formed by the slide die and the split die, respectively, by the clamping operation of the press die. ,
A sectional hat shape in which the slide molds are separated from each other by the mold opening operation of the press mold and the divided molds are brought close to each other up to a position where they do not interfere with the bead portion and the mold drawing direction. Manufacturing method of parts.   2. The method for manufacturing a cross-sectional hat-shaped part according to claim 1, wherein, at the time of clamping, a groove-shaped bead portion is press-formed along a longitudinal direction of a portion corresponding to the top wall portion of the intermediate molded body. .   In a state where the mold clamping is completed, the pair of split molds are mutually connected to both sides in the width direction of the bead part provided in the portion corresponding to the top wall part to a position where the bead part does not interfere with the mold opening operation. The method for manufacturing a cross-sectional hat-shaped part according to claim 2, wherein a gap sufficient to allow the cross-sectional hat part to remain is left.

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