JP5016289B2 - Panel member forming method - Google Patents

Description

  The present invention relates to a method for forming a panel member in which an edge is wound.

  For example, a panel member constituting an automobile bonnet, trunk, door, and the like is formed by stacking an outer panel and an inner panel obtained by forming a plate member into a molded product shape (product shape) and fastening these edges.

  Conventionally, when molding such a panel member, first, a part other than the part used for the outer panel or the like (the outer part of the molded product, the outer part of the product) is cut out from the plate member, and then drawn into a molded product shape. Molding was in progress.

  In Patent Document 1, when forming a panel having a three-dimensional shape such as a fender of a motorcycle or a bumper of an automobile, a metal plate is punched into a developed shape of the molded product, and at the same time, a pre-bending portion for curling is formed. Is formed into a molded product shape by bending (drawing) the metal plate. Then, the pre-bending portion is subjected to curl molding with a curl die so that the edge portion of the molded product is formed into a curl shape, and the exposure of the edge portion at the edge portion is suppressed.

Japanese Patent Publication No. 63-58650

  However, in the technique described in Patent Document 1, a preliminary bending portion having a desired angle and a radius of curvature is formed in order to form a preliminary bending portion at the time of punching into the developed shape and to fold down the preliminary bending portion. It is difficult to form. For this reason, it is difficult to form a curled edge having a desired shape.

  Therefore, in order to solve the above-described problems, for example, the plate member is drawn into a molded product shape, and after the outer portion of the molded product is cut, the edge including the cut end of the plate member is bent. It is conceivable to form a pre-bending part.

  However, in such a case, a step of forming the pre-bending portion is required in addition to the step of drawing and the step of cutting out the outer part of the molded product. For this reason, the number of steps required for forming the panel member increases, leading to a decrease in production efficiency and an increase in cost. In addition, due to the increase in the number of processes accompanying the molding of the panel member, there is a concern that processing defects will increase.

  Further, since the preliminary bending portion is usually of a very short size, it is difficult to bend it, and in particular, it is difficult to accurately form it with a thick plate member or the like.

  The present invention has been made in view of the conventional problems, and it is possible to easily form a pre-bending portion having a desired shape while suppressing the number of steps related to forming a panel member with the edge being tightened. Then, it aims at providing the shaping | molding method of the panel member which enables shaping | molding of the panel member which has an edge part with high appearance quality.

A method for forming a panel member according to the present invention is a method for forming a panel member with an edge portion tightened, the step of press-molding a plate member into a molded product shape, and the outside of the molded product of the press-formed plate member Cutting the position and forming it into a panel member having a molded product shape, and forming the edge of the panel member including the cut end into a curl shape by a curl bending die, In the press forming step, a pre-bending portion is formed at a portion that becomes an edge portion of the panel member, and the edge portion of the panel member on which the pre-bending portion is formed is formed into a curl shape by the curl bending die. the process is characterized in Rukoto tightened up.

  According to such a method, in the step of forming the shape of the molded product by press forming the plate member, at the same time, the preliminary bending portion used at the time of curl molding is formed, thereby increasing the preliminary bending portion. It can be formed into a desired shape with high accuracy. For this reason, at the time of curl forming, the occurrence of buckling at the edge is suppressed, and a panel member having an edge having extremely high appearance quality and high fastening strength can be formed. And since the process which concerns on the said press molding, and the process of shape | molding a preliminary | backup bending part are performed simultaneously, the number of processes required for shaping | molding of a panel member can be suppressed. Therefore, the production efficiency can be improved and the production cost can be reduced.

  Further, when the radius of curvature of the preliminary bending portion is R1 and the radius of curvature of the winding portion of the curl bending die is R2, by setting so as to satisfy 0.7R2 <R1 <R2, Further, it is possible to effectively prevent the edge of the panel member from abutting against the winding portion of the curl bending mold and hindering smooth curl molding. Thereby, generation | occurrence | production of the buckling in the edge part of a panel member is suppressed, and the panel member which has an edge part with a further better external appearance can be shape | molded.

  According to the present invention, in the case of forming a panel member in which the edge is wound, in order to form a pre-bent portion at the edge of the panel member at the same time as forming the molded product shape by press forming the plate member, The preliminary bending portion can be formed in a desired shape with high accuracy. Therefore, when the edge is curled, since the occurrence of buckling at the edge is suppressed, a panel member having an edge with extremely high appearance quality and high fastening strength can be formed.

  In addition, according to the present invention, the number of steps required for forming the panel member can be suppressed by simultaneously performing the step related to press forming and the step of forming the pre-bending portion, thereby improving production efficiency and production. Cost can be reduced.

  Hereinafter, preferred embodiments of a method for forming a panel member according to the present invention will be described in detail with reference to the accompanying drawings.

  FIG. 1 is a partially cutaway perspective view of an automobile rear door 12 which is an application example of a panel member 10 formed by a method for forming a panel member according to an embodiment of the present invention. FIG. 2 is a partially omitted front view of the automobile rear door 12 from the direction of arrow II in FIG. 1 (the direction when the automobile rear door 12 is seen from the outside of the car).

  The automobile rear door 12 includes a panel member 10 in which an outer panel 14 and an inner panel 16 are overlapped and an edge portion 18 is fastened by winding and a window frame 20 provided on the upper portion of the panel member 10. In this case, the edge portion 18 fastened by the tightening extends three-dimensionally over the portion indicated by the arrow E1 in FIG. 2, that is, the most part of the panel member 10 constituting the automobile rear door 12. ing. In such an edge portion 18, the front end surface (end portion) 14 a of the outer panel 14 and the front end surface (end portion) 16 a of the inner panel 16 are tightened and tightened (see FIGS. 9B and 9B). 9C). 2, that is, the portion constituting the lower end side of the window frame 20, for example, the edges of the outer panel 14 and the inner panel 16 are bent toward the inside of the panel member 10. ing.

  Next, a method for forming the panel member according to the present embodiment for forming the panel member 10 configured as described above will be described based on the flowchart of FIG.

  FIG. 3 is a flowchart showing the procedure of the method for forming the panel member 10 according to the present embodiment. In this molding method, after forming the outer panel 14 and the inner panel 16 as a panel member from a plate member (for example, a sheet metal material), the edges of the outer panel 14 and the inner panel 16 are wound and fastened to fasten the panel member 10. Is molded.

  First, in step S1 in FIG. 3, the plate member 22 is subjected to drawing (draw molding, press molding) to form a molded product shape (product shape) P of the outer panel 14 (see FIGS. 4 and 5). 4 is a schematic plan view showing a state in which the shape of the outer panel 14 is formed by drawing the plate member 22, and FIG. 5 is a partially omitted vertical sectional view taken along line V-V in FIG. It is.

  As a method for performing such drawing, for example, as shown in FIG. 6, first, positioning (not shown) is performed between the drawing die 24 constituting the drawing mold 23, the drawing punch 26 and the blank holder 27. The plate member 22 is set by means. The forming recess 24 a of the drawing die 24 is set to have substantially the same shape as the outer surface of the outer panel 14. The forming convex portion 26 a of the drawing punch 26 is set to have substantially the same shape as the inner surface of the outer panel 14.

  Next, as shown in FIG. 7, with the drawing punch 26 fixed, the drawing die 24 is lowered by lifting means (not shown) and the blank holder 27 is lowered to form the molding recess 24 a of the drawing die 24. The plate member 22 is sandwiched between the forming convex portion 26 a of the drawing punch 26. As a result, the plate member 22 is drawn (press-molded) along the shape of the molding recess 24a and molding projection 26a, and the molded product shape P of the outer panel 14 is molded. In this case, the blank holder 27 is lowered together with the drawing die 24 in a state where the plate member 22 is clamped between the upper surface thereof and the molding recess 24a (drawing bead 24c) of the drawing die 24, and the plate member 22 is drawn by the drawing punch. The function to guide to 26 is fulfilled. Then, the blank holder 27 is lowered and stopped until the upper surface thereof is flush with the surface of the forming convex portion 26a of the adjacent drawing punch 26, and the vicinity of the end portion of the plate member 22 is formed together with the drawing die 24. .

  Here, in the molding method of the panel member 10 according to the present embodiment, a portion where the edge portion 18 of the panel member 10 is formed in the molding concave portion 24a and the molding convex portion 26a (a portion indicated by an arrow E1 in FIG. 2). Pre-bending parts 24b and 26b (indicated by dotted lines 24b and 26b in FIG. 6) are provided at positions corresponding to Thereby, the preliminary | backup bending part (flange) 14b used when winding and fastening the edge part of the outer panel 14 and the inner panel 16 can be shape | molded simultaneously with the said drawing (refer FIG. 9A).

  It should be noted that the upper surface of the molding recess 24a of the drawing die 24 and the blank holder 27 is outside the molded product shape P of the plate member 22 shown in FIG. 4, that is, on the outer panel 14 (panel member 10) which is a molded product (product). Drawing beads (draw beads) 24c and 27a are provided at positions corresponding to the molded product external position (product external position) O which is not used. Therefore, the wrinkle generation in the plate member 22 can be effectively suppressed by the drawing beads 24c and 27a during the drawing. In addition, the bead portion 22a formed on the plate member 22 by the squeezing beads 24c and 27a is located at the molded product external position O, and therefore does not affect the molded product shape P.

  Next, in step S2, the molded product shape P portion is punched from the plate member 22 on which the molded product shape P of the outer panel 14 is molded as described above, and the outer panel 14 that is a panel member is molded. That is, the molded product external position O including the bead portion 22a is cut out from the plate member 22.

  As a method for performing such punching (cutting), for example, as shown in FIG. 8, a portion where the molded product shape P of the plate member 22 is formed is replaced with an upper mold 30 constituting the trim mold 29. Clamp between the lower molds 32. The upper mold 30 and the lower mold 32 are provided with a fixed concave portion 30a and a fixed convex portion 32a having substantially the same shape as the outer surface and inner surface of the outer panel 14 having the molded product shape P. Therefore, the plate member 22 can be clamped accurately and firmly with a wide contact area.

  At this time, the cut position C to be the cut end portion (tip surface 14a) of the molded product shape P (outer panel 14) is set along the side surfaces 30b and 32b of the upper mold 30 and the lower mold 32. .

  Next, the blade die 34 is lowered by elevating means (not shown) along the side surfaces 30b and 32b of the upper die 30 and the lower die 32, and the plate member at the cutting position C by the blade surface 34a of the blade die 34. 22 is cut. As a result, the molded product external position O is cut out from the plate member 22, and the outer panel 14 is stamped and molded.

  Here, in the method for forming the panel member 10 according to the present embodiment, the cut position C is set to a position that coincides with the front end surface 14a of the pre-bending portion 14b of the outer panel 14 that is a molded product. Thereby, in the panel member 10, the preliminary | backup bending part 14b substantially corresponded with the edge part 18 extended to the part shown by the arrow E1 in FIG. 2 is shape | molded. That is, the preliminary bending portion 14b is formed to extend to the edge portion of the outer panel 14 (see FIG. 9A).

  Next, in step S3, an inner panel (panel) 16 is formed by applying substantially the same process as steps S1 and S2 to other plate members. The molding method of the inner panel 16 in this case is substantially the same as that of the outer panel 14 described in Steps S1 and S2, and therefore detailed description thereof is omitted. Then, a pre-bending portion (flange) 16b is also formed on the edge portion of the inner panel 16 formed in this manner, similarly to the outer panel 14 (see FIG. 9A).

  Such an inner panel 16 usually has a tighter drawn shape than the outer panel 14, and it is difficult to form a desired molded product shape only by drawing with the drawing mold 23. There is a case. In such a case, it is preferable to perform a molding process using a wrist-like mold subsequent to the drawing process and mold the preliminary bending portion 16b in the wrist-making process.

  When the outer panel 14 and the inner panel 16 are formed from the plate member 22 as described above, in the method for forming the panel member 10 according to the present embodiment, the edges of the outer panel 14 and the inner panel 16 are then wound. The panel member 10 is formed by fastening and fastening.

  That is, in step S4, as shown in FIG. 9A, the outer panel 14 and the inner panel 16 are arranged so that the front end surface 14a of the outer panel 14 is displaced from the front end surface 16a of the inner panel 16 by a distance L. In this case, preliminary bent portions 14b and 16b formed by the drawing are formed on the edge portions (front end side) of the outer panel 14 and the inner panel 16.

  Next, in step S5, as shown in FIG. 9B, the edge of the outer panel 14 that is displaced from the inner panel 16 by a distance L is curled and tightened to form a curled (substantially circular) edge 18. To do.

  As a curl forming method in this case, for example, as shown in FIG. 10, the stacked outer panel 14 and inner panel 16 are mounted on the mounting surface 36 a of the mounting table 36, and are pressed and fixed by the pressing pad 38. Thereafter, the curl punch 42 having a curl portion (winding portion) 40 formed of an arc-shaped concave portion is moved while sliding on the placement surface 36a. Then, the edge (tip side) of the outer panel 14 is tightened and fastened so as to wind the edge (tip side) of the inner panel 16, and the edge 18 is formed. Thereby, each front end surface 14a, 16a of the outer panel 14 and the inner panel 16 is included inside, and the panel member 10 having the edge 18 having excellent appearance quality can be reliably molded (see FIGS. 9B and 10). ).

  In this case, in the method for forming the panel member 10 according to the present embodiment, as shown in FIG. 11, the preliminary bending portion 14b of the outer panel 14 is bent and formed with a radius of curvature R1, and the curled portion 40 of the curl punch 42 is formed by the above-described method. The curvature radius R2 is set to be slightly larger than the curvature radius R1. That is, the relationship between the curvature radii R1 and R2 is set to 0.7R2 <R1 <R2, more preferably 0.8R2 <R1 <R2. Then, the front end surface 14a of the outer panel 14 is brought into contact with the wall surface of the curl portion 42 of the curl punch 42, or the base of the pre-bending portion 14b of the outer panel 14 to the lower jaw 44 formed at the lower portion of the curl portion 40. The contact of the portions can be effectively prevented.

  That is, if the relationship between the radii of curvature R1 and R2 is set as described above, the edge of the outer panel 14 (the tip surface 14a and the pre-bending portion 14b) abuts against the curl punch 42 during curl molding, and smooth curling is achieved. It is possible to prevent the molding from being hindered. Thereby, the occurrence of buckling at the edges of the outer panel 14 and the inner panel 16 is effectively prevented, and the edge 18 having a better appearance is formed.

  By the way, in this embodiment, the preliminary | backup bending part 14b of the outer panel 14 is shape | molded by the process which concerns on the said drawing. That is, the preliminary bending portion 14b is formed by the preliminary bending forming portions 24b and 26b disposed in the forming concave portion 24a and the forming convex portion 26a of the drawing mold 23.

  In this case, the drawing die 24 and the drawing punch 26 used in the drawing mold 23 have a receiving portion (molding concave portion 24a and molding convex portion) in contact with the plate member 22 as compared with a normal bending molding (bend) die. The area of 26a) can be widened. Therefore, since the plate member 22 is positioned and molded in the drawing mold 23 with extremely high accuracy, the preliminary bending portion 14b can be molded into a desired shape with high accuracy. That is, in the present embodiment, the relationship between the curvature radii R1 and R2 (0.7R2 <R1 <R2) can be easily and accurately realized, so that the edge 18 having higher appearance quality can be more reliably formed. Can do.

  Next, in step S6, as shown in FIG. 9C, seam molding is performed to further mold the edge 18 formed by the curl molding. In the seam molding, the edge 18 is crushed by pressing so that the edge 18 is deformed flat, and the tightening strength thereof is further improved, and the appearance quality of the edge 18 is further improved.

  As a seam forming method in this case, for example, as shown in FIG. 12, after curl forming on the mounting surface 36a, the curl punch 42 is retracted with the outer panel 14 and the inner panel 16 fixed by the pressing pad 38 ( Back). Next, the seam punch (crushing die) 45 is lowered, and seam forming is performed by crushing the edge portion 18 while deforming it flatly by the seam portion (crushing portion) 46 formed in the seam punch 45. At this time, in the process in which the edge 18 is deformed flatly, plastic flow is generated inside the outer panel 14 and the inner panel 16, so that the radius of curvature at the root portion of the outer panel 14 at the edge 18 is sufficiently small, Occurrence is prevented. Thereby, the external appearance of the edge part 18 can be improved further.

  As described above, according to the method for forming the panel member 10 according to the present embodiment, the preliminary bending portion 14b (16b) is simultaneously formed in the step of drawing (pressing) the plate member 22. In this case, in the drawing mold 23, since the plate member 22 is set and molded with extremely high accuracy, the preliminary bending portion 14b (16b) can be formed into a desired shape with high accuracy.

  Therefore, the relationship between the radius of curvature R1 at the pre-bending portion 14b of the outer panel 14 and the radius of curvature R2 at the curled portion 40 of the curl punch 42 can be easily and accurately set to a desired value, for example, 0.7R2 <R1 <R2. Can be set to For this reason, at the time of curl forming, it is possible to effectively prevent the front end surface 14a and the pre-bending portion 14b constituting the edge of the outer panel 14 from hitting the curl punch 42 and hindering smooth curl forming. Thereby, generation | occurrence | production of the buckling in the edge part 18 is suppressed, and the edge part 18 with very high external appearance quality and high fastening strength can be shape | molded. Moreover, the rigidity of the panel member 10 can be improved by molding the edge 18 having such a high fastening strength.

  Furthermore, in the step of drawing the plate member 22 as described above, at the same time, in order to form the pre-bending portion 14b (16b), after the step of drawing and the step of cutting the molded product external position O, There is no need to perform the process of forming the pre-bending portions 14b and 16b. Therefore, the number of steps required for forming the panel member 10 can be suppressed, the production efficiency can be improved, the production cost can be reduced, and the occurrence of processing defects can be reduced.

  Moreover, in the molding method of the panel member 10 according to the present embodiment, depending on the application location of the panel member 10 molded by the molding method, for example, a required fastening strength in a door, a bonnet or the like, a required external shape, and the like. A method for performing only curl molding and a method for performing seam molding can be used as appropriate.

  It should be noted that the present invention is not limited to the above-described embodiment, and it is naturally possible to adopt various configurations without departing from the gist of the present invention.

  For example, in the above-described embodiment, the panel member 10 to be molded is formed from two panel members, that is, the outer panel 14 and the inner panel 16, but the present invention is not limited to this, and the panel member may be one or three. The panel member molding method according to the present invention is also applicable as described above.

It is a partially cutaway perspective view of an automobile rear door which is an application example of a panel member formed by the method for forming a panel member according to an embodiment of the present invention. FIG. 2 is a partially omitted front view of an automobile rear door from the direction of arrow II in FIG. 1. It is a flowchart which shows the procedure of the shaping | molding method of the panel member which concerns on this embodiment. It is a schematic top view which shows the state which gave the shaping | molding to the board member and shape | molded the molded product shape of the outer panel. FIG. 5 is a partially omitted vertical sectional view taken along line VV in FIG. 4. It is a partially omitted longitudinal sectional view showing a state in which a plate member is set in a drawing mold. FIG. 7 is a partially omitted longitudinal sectional view showing a state in which a plate member is formed into a shape of a molded product of the outer panel by the drawing mold shown in FIG. 6. FIG. 5 is a partially omitted vertical cross-sectional view showing a state in which a plate member formed with a molded product shape of the outer panel shown in FIG. 4 is punched and formed by a trim mold. FIG. 9A is a partially omitted vertical cross-sectional view showing a state in which the outer panel and the inner panel are overlapped before fastening the edge of the panel member according to the present embodiment, and FIG. 9B is the outer panel and the inner panel shown in FIG. 9A. FIG. 9C is a partially omitted vertical cross-sectional view showing a state where the edge portion of the panel is curled, and FIG. 9C is a partially omitted vertical cross-sectional view showing a state where the edge portion after curl forming shown in FIG. 9B is seam-formed. FIG. 9B is a partially omitted vertical cross-sectional view showing a state in which curl molding is performed on the edges of the outer panel and the inner panel shown in FIG. 9A. FIG. 9B is a partially omitted vertical cross-sectional view showing a state immediately before the curl forming is performed on the edges of the outer panel and the inner panel shown in FIG. 9A. FIG. 9B is a partially omitted vertical cross-sectional view showing a state where seam molding is performed on the edge of the panel member shown in FIG. 9B.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 ... Panel member 12 ... Automotive rear door 14 ... Outer panel 14a, 16a ... Front end surface 14b, 16b ... Preliminary bending part 16 ... Inner panel 18 ... Edge 22 ... Plate member 23 ... Drawing die 24 ... Drawing die 24b, 26b ... Preliminary bending forming part 26 ... Drawing punch 27 ... Blank holder 29 ... Trim mold 30 ... Upper mold 32 ... Lower mold 34 ... Blade type 34a ... Blade surface 36 ... Place 38 ... Presser pad 40 ... Curl part 42 ... Curl Punch 45 ... Seam punch 46 ... Seam part C ... Cut position O ... Molded product external position P ... Molded product shape R1, R2 ... Curvature radius

Claims (2)

It is a method for forming a panel member with a rim rolled up,
Pressing the plate member into a molded product shape;
Cutting out the molded product external position of the press-molded plate member and molding it into a panel member having a molded product shape;
A step of forming an edge portion of the panel member including the cut end portion into a curl shape by a curl bending die; and
Have
In the press forming step, a pre-bending portion is formed at a portion that becomes an edge portion of the panel member, and the edge portion of the panel member on which the pre-bending portion is formed is formed into a curl shape by the curl bending die. step, the molding process of the panel member, characterized in Rukoto tightened winding of. In the molding method of the panel member according to claim 1,
When the radius of curvature of the preliminary bent portion is R1, and the radius of curvature of the curled bending mold is R2,
0.7R2 <R1 <R2
A method for forming a panel member, wherein:

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