JP2014076455A - Molding method of panel component - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a molding method of panel components which can improve the quality of molded parts.SOLUTION: In a bending process, a panel material 20 is bent to form a linear top part 20A so as to move closer to a curviform molding shape as a whole. In an outrigger molding process after the bending process, while restraining the peripheral edge part 20B of the panel material 20 over all the circumferences, outrigger molding is carried out to molding shape by making a direction along the direction facing to the top part 20 as a press direction (the direction of arrow B). Here, the panel parts which are molded product after molding serve as a shape in which is attitude maintainable on a plane by making three points in the peripheral edge parts as a support point. Moreover the bending direction (the direction of arrow A) to the panel material 20 in the bending process and the press direction (the direction of arrow B) to the panel material 20 in the outrigger molding process are set up to coincide with the direction perpendicular to an imaginary plane which contains all of the support points in the molded product condition after molding.

Description

  The present invention relates to a method for forming a panel component.

  As a method for forming a body panel or the like of an automobile, for example, a method of deep drawing a flat plate from a direction orthogonal to the plate surface is known (for example, see Patent Document 1).

JP 2010-167480 A

  However, with such a method, for example, when there are a deeply squeezed part and a shallowly squeezed part, the amount of material inflow during molding varies greatly depending on the part, so there is room for improvement from the viewpoint of improving quality.

  In view of the above facts, an object of the present invention is to obtain a method for forming a panel component that can improve the quality of a molded product.

  The method for forming a panel component according to the first aspect of the present invention includes a bending step of bending a panel material so as to approach a shape of a molded product having a curved shape as a whole, and forming a linear top portion, and the bending step. Thereafter, the peripheral end portion of the panel material is constrained over the entire periphery, and an overhang forming step is performed in which the direction along the direction facing the top portion is stretched and formed into the shape of the molded product.

  According to the method for forming a panel component of the present invention described in claim 1, first, in the bending step, the panel material is bent so as to approach the shape of the molded product having a curved shape as a whole to form a linear top. . In the overhang forming step after the bending step, the peripheral end portion of the panel material is constrained over the entire circumference, and the shape along the direction opposite to the top portion is set as a press direction to be formed into a formed product shape. Thus, the extending amount of a panel material is suppressed by performing the bulging forming process after a bending process. In addition, by constraining the peripheral edge of the panel material over the entire circumference in the overhang molding process, the panel material is uniformly subjected to tensile stress inside the peripheral edge, so the surface quality of the molded product is improved. Can be good.

  According to a second aspect of the present invention, there is provided a method for forming a panel component according to the first aspect, wherein the panel component which is a molded product after molding is positioned on a plane with three or more points at the peripheral edge as support points. It is a shape that can be maintained, and the bending direction with respect to the panel material in the bending step and the pressing direction with respect to the panel material in the overhang forming step include all of the support points in the state of the molded product after forming. It is set to coincide with the direction perpendicular to the plane.

  According to the method for molding a panel part of the present invention described in claim 2, the panel part which is a molded part after molding has a shape capable of maintaining a posture on a plane with three or more points at the peripheral edge as supporting points. ing. And the bending direction with respect to the panel material in the bending process and the pressing direction with respect to the panel material in the overhang forming process coincide with the direction perpendicular to the virtual plane including all of the support points in the state of the molded product after molding. It is set to be. Thereby, the extending amount of the panel material in an overhang forming process can be suppressed small.

  According to a third aspect of the present invention, there is provided a method for forming a panel component according to the second aspect, wherein the panel component is placed on the plane when the peripheral end portion is placed on the plane with the plane in contact with the plane. The panel component forming method according to claim 2, wherein only the support point is a part that can be contacted.

  According to the method for molding a panel component of the present invention described in claim 3, when the panel component is placed on a plane with its peripheral end in contact with the plane, the portion that can contact the plane and the plane The support points for maintaining the posture above are completely coincident with each other. For this reason, the direction perpendicular to the imaginary plane including all of the support points in the state of the molded product after molding is the direction that minimizes the amount of stretching of the panel material. Thereby, the extending amount of the panel material in the stretch forming process can be minimized.

  According to a fourth aspect of the present invention, there is provided a method for forming a panel component according to any one of the first to third aspects, wherein the panel component which is a molded product after molding is mounted in the vehicle in the vehicle width state. A vehicular fender panel having a curved top directed obliquely upward in the outer direction, wherein a bending direction with respect to the panel material in the bending step and a pressing direction with respect to the panel material in the overhang forming step are formed products after forming It is set to coincide with the direction along the direction facing the curved top in the state of.

  According to the panel component molding method of the present invention as set forth in claim 4, the vehicular fender panel has a curved top portion in which the panel component, which is a molded product after molding, is directed obliquely upward and outward in the vehicle width direction in a vehicle mounted state. It has become. And the bending direction with respect to the panel material in the bending process and the pressing direction with respect to the panel material in the overhang forming process are set so as to coincide with the direction along the direction facing the curved top in the state of the molded product after molding. Yes. Thereby, the fender panel for vehicles by which the unevenness | corrugation was set to the design surface upper part can be shape | molded by a simple method.

  As described above, according to the panel component molding method of the first aspect of the present invention, the quality of the molded product can be improved.

  According to the method for molding a panel component according to claim 2, there is an excellent effect that the surface quality of the molded product can be further improved by suppressing the stretch amount of the panel material in the stretch molding process.

  According to the method for molding a panel component according to claim 3, an excellent effect that the surface quality of the molded product can be further improved by minimizing the amount of stretching of the panel material in the stretch molding process. Have.

  According to the method for forming a panel component according to claim 4, it is possible to form irregularities on the upper part of the design surface of the vehicle fender panel and to ensure high surface quality even if such irregularities are formed. It has an excellent effect.

It is a perspective view which shows the fender panel shape | molded by the shaping | molding method of the panel components which concerns on one Embodiment of this invention in a vehicle attachment state. FIG. 2 is a cross-sectional view taken along line 2-2 in FIG. It is a perspective view which shows the state which mounted the fender panel of FIG. 1 on the plane by using the three points in the peripheral edge part as a support point. It is a longitudinal cross-sectional view for demonstrating the molding method of the panel component which concerns on one Embodiment of this invention. FIG. 4A shows a bending process. FIG. 4B shows a state in which the peripheral end portion of the panel material is constrained over the entire circumference in the bulging forming process. FIG. 4C shows a state in which the panel material is stretched and molded in the stretch molding process. It is a perspective view which shows the press molding apparatus etc. which are applied to the molding method of the panel components which concern on one Embodiment of this invention. It is a figure which shows the relationship between a fender panel and a press direction while showing the fender panel of FIG. 1 by vehicle front view. It is a longitudinal cross-sectional view which shows the fender panel which has an unevenness | corrugation in the design surface upper part by vehicle front view.

  A panel component molding method according to an embodiment of the present invention will be described with reference to FIGS. In these drawings, an arrow FR appropriately shown indicates the vehicle front side, an arrow UP indicates the vehicle upper side, and an arrow IN indicates the vehicle width direction inner side.

  FIG. 1 is a perspective view of a vehicle fender panel 10 (hereinafter simply referred to as “fender panel 10”) as a panel component (molded product) molded by the panel component molding method according to the present embodiment. It is shown in the figure. FIG. 2 shows a cross-sectional view taken along line 2-2 of FIG.

(Fender panel configuration)
The fender panel 10 shown in these drawings is made of metal (made of steel, aluminum alloy, etc.), and is disposed on the front side surface of the vehicle body. The fender panel 10 is an element grasped as a covering member for a vehicle in a broad sense. The fender panel 10 is arranged on the upper side of the front wheel 18 and the peripheral portion thereof and constitutes a design surface, and the inner wall portion 14 bent downward from a parting position 15 between the outer wall portion 12 and the hood 16. (See FIG. 2). The fender panel 10 has a curved shape as a whole. That is, as shown in FIG. 2, the outer wall portion 12 of the fender panel 10 has a curved top portion 12 </ b> A that is directed obliquely upward and outward in the vehicle width direction in a vehicle-mounted state. The fender panel 10 is set such that the distance L in the vehicle width direction from the outermost portion in the vehicle width direction to the parting position 15 with the hood 16 is longer than that of conventional fender panels of general vehicles. Has been.

  Also, as shown in FIG. 3, the fender panel 10 that is a molded product can maintain its posture on a plane (the virtual plane 28 in the drawing) with the three points at the peripheral end 10X as support points 10A, 10B, and 10C. It is a simple shape. The fender panel 10 in the state shown in FIG. 3 is configured to maintain its posture even when pressed from the side, for example. That is, the fender panel 10 has only the support points 10A, 10B, and 10C that can come into contact with the flat surface when the peripheral end portion 10X contacts the flat surface and is placed on the flat surface.

  The support point 10A is the upper front end of the fender panel 10 in the vehicle mounting state, the support point 10B is the upper rear end of the fender panel 10 in the vehicle mounting state, and the support point 10C is the lower rear end of the fender panel 10 in the vehicle mounting state. Each is set. In addition, these support points 10A, 10B, and 10C are not points in a strict sense but have a certain area. The support point 10A and the support point 10B are arranged on the inner side in the vehicle width direction than the support point 10C when the fender panel 10 is mounted on the vehicle. For this reason, when the fender panel 10 is in the vehicle mounting state, the virtual plane 28 in FIG. 3 is inclined inward in the vehicle width direction toward the vehicle upper side when the vehicle is viewed from the front.

(Outline of the device)
Next, an apparatus for forming such a fender panel 10 will be outlined with reference to FIGS. In addition, the apparatus applied to the molding method of panel components is not limited to the following apparatuses.

  The press working apparatus 22 shown in FIG. 4A is an apparatus for bending the panel material 20 that is a raw material of the fender panel 10, and a part thereof is shown in FIG. 4A. The press working apparatus 22 includes a die mold 24 and a punch (upper mold) 26. The die mold 24 is formed with a V-shaped bending groove 24A, and the panel material 20 (see the two-dot chain line in the figure) is placed thereon. The punch 26 includes a pressing surface 26 </ b> A corresponding to the bending groove 24 </ b> A, and is driven in a direction in which the punch 26 contacts and separates from the die mold 24. That is, when the punch 26 presses the panel material 20 placed on the die mold 24 against the inner surface of the bending groove 24A, the panel material 20 is bent into a V shape.

  4 (B), 4 (C), and 5 is an apparatus for overhanging the panel material 20 bent into a V shape, and is disposed on the upper side. The upper mold 32 and the lower mold 34 disposed on the lower side are included. The center part of the lower surface of the upper mold 32 is a molding surface 32A formed in a concave shape. Further, the outer edge portion 32B of the lower surface of the upper mold 32 is used for restraining the panel material 20, and is formed on the entire outer periphery of the molding surface 32A. The upper die 32 is driven in a direction toward the lower die 34 by a drive unit (not shown) and in the opposite direction. The upper surface of the lower mold 34 is a molding surface 34A formed in a convex shape. The molding surface 34 </ b> A of the lower mold 34 and the molding surface 32 </ b> A of the upper mold 32 are arranged to face each other and have a shape for molding the fender panel 10.

  A frame-shaped holder 36 is disposed on the outer peripheral side of the lower mold 34. The holder 36 surrounds the lower die 34 and is disposed opposite to the outer edge portion 32B of the upper die 32, and is urged by an urging member (not shown) toward the upper die 32 side. When the panel material 20 is molded, the upper mold 32 pushes down the peripheral end portion 20 </ b> B of the panel material 20 against the urging force of the holder 36.

(Molding method and action / effect)
Next, with reference to FIG. 3 and FIG. 4, a panel component molding method and the operation and effect of this embodiment will be described.

  First, a folding process is performed. In the bending process, first, the panel material 20 (see the two-dot chain line) is placed on the die mold 24 in the press working apparatus 22 shown in FIG. Then, the punch 26 presses the panel material 20 against the inner surface of the bending groove 24A of the die mold 24, and bends the panel material 20 so as to approach the shape of the molded product of the fender panel 10 (see FIG. 1) (in the direction of arrow A). The linear top portion 20A is formed.

  Next, as shown in FIG. 4B, after the bending process, an overhang forming process is performed. In the overhang forming process, first, the folded panel material 20 is placed on the lower mold 34 and the holder 36 of the press forming apparatus 30. At this time, the top portion 20 </ b> A of the panel material 20 is disposed above the top portion of the molding surface 34 </ b> A of the lower mold 34, and the peripheral end portion 20 </ b> B of the panel material 20 is disposed on the holder 36. In this state, the upper die 32 is lowered in a direction facing the top portion 20A of the panel material 20, so that the peripheral edge portion 20B of the panel material 20 is sandwiched between the outer edge portion 32B of the upper die 32 and the holder 36. The 20 circumferential end portions 20B are restrained over the entire circumference. Then, as shown in FIG. 4C, the panel member 20 is moved down by further lowering the upper mold 32 with the direction along the direction facing the top 20A of the panel member 20 as the pressing direction (arrow B direction). The panel 10 (see FIG. 3) is stretched into a molded product shape. In addition, the code | symbol 20 shown with a dashed-two dotted line in FIG.4 (C) shows the position of the panel material 20 before stretch forming.

  Thus, the extension amount of the panel material 20 shown by FIG. 4 is suppressed by performing the bulging forming process after a bending process. Further, by constraining the peripheral end portion 20B of the panel material 20 over the entire circumference in the overhang forming step, the panel material 20 receives a tensile stress uniformly on the inner side of the peripheral end portion 20B. Generation | occurrence | production is suppressed and the surface quality of a molded article can be made favorable. In addition, although a punching process is performed after an overhang forming process, description of this punching process is abbreviate | omitted.

  Moreover, in this embodiment, the bending direction (arrow A direction) with respect to the panel material 20 in the bending process and the pressing direction (arrow B direction) with respect to the panel material 20 in the overhang forming process are formed after the forming shown in FIG. It is set so as to coincide with a direction (arrow P direction) perpendicular to the virtual plane 28 including all of the support points 10A, 10B, and 10C in the product state. Thereby, since the extending amount of the panel material 20 in an overhang forming process can be restrained small, the surface quality of a molded product can be improved further.

  More specifically, as described above, when the fender panel 10 is placed on a flat surface with the peripheral end portion 10X in contact with the flat surface, the fender panel 10 maintains the posture on the flat surface and the portion that can contact the flat surface. The supporting points 10A, 10B, and 10C for making them coincide completely. For this reason, the direction perpendicular to the virtual plane 28 including all of the support points 10A, 10B, 10C in the state of the molded product after molding (direction of arrow P) is the panel material 20 (see FIG. 4C). ) In the direction that minimizes the amount of stretching. Thereby, the extending amount of the panel material 20 in the bulging forming step shown in FIG. 4C can be minimized.

  In the present embodiment, the direction (arrow P direction) perpendicular to the virtual plane 28 including all of the support points 10A, 10B, 10C in the state of the molded product after molding shown in FIG. In this state, the direction is the same as the direction along the direction (arrow Q direction) facing the curved top portion 12A. In other words, the bending direction (arrow A direction) with respect to the panel material 20 in the bending process shown in FIG. 4 and the pressing direction (arrow B direction) with respect to the panel material 20 in the overhang forming process are the states of the molded product after molding. Is set to coincide with a direction along the direction (arrow Q direction (see FIG. 3)) facing the curved top portion 12A (see FIG. 3). Thereby, the fender panel 10 with the unevenness on the upper surface of the design can be formed by a simple method, and high surface quality can be ensured even if the upper surface of the design surface of the fender panel 10 is uneven. it can.

  FIG. 6 shows the fender panel 10 mounted in the vehicle in a front view of the vehicle with the peripheral parts omitted, and the direction corresponding to the bending direction in the bending process and the pressing direction in the overhang forming process. Is shown in the direction of arrow C. Further, the arrow D direction in the figure indicates the pressing direction when the fender panel 10 is formed only by deep drawing as in the prior art, and in this deep drawing forming, the panel material is the front end portion on the vehicle front side. And the site | part which will become a rear-end part of a vehicle rear side is restrained.

  Here, a supplementary explanation will be given while comparing with the comparison of deep drawing with the arrow D direction in FIG. 6 as the pressing direction. In the comparative example, for example, a vehicle fender panel 40 (hereinafter simply referred to as “fender panel 40”) as a panel component having a convex portion 40A and a concave portion 40B at the upper portion of the design surface as shown in FIG. 7 is desired. Even if it is a case, the shaping | molding die which follows the convex part 40A and the recessed part 40B cannot be extracted. On the other hand, in the case of the present embodiment, the pressing direction in the overhang forming step is a direction along the direction facing the curved top 40C in the state of the molded product (see the direction of arrow C). A forming die along the portion 40A and the recess 40B can be extracted. In other words, according to the present embodiment, the fender panel 40 that expresses the feeling of inflection due to the unevenness on the upper part of the design surface can be formed by a simple method.

  In addition, other contrasts such as forming the projections 40A and the recesses 40B with a split mold are also conceivable, but in such a comparison, the amount of material inflow at the time of molding varies depending on the part, so that distortion occurs. The surface quality is not stable. On the other hand, in the case of the present embodiment, the panel material 20 shown in FIG. 4C is subjected to a tensile stress uniformly at the inner side of the peripheral end portion 20B in the overhang forming process. The surface quality can be improved.

  In addition, the present embodiment is advantageous in improving the degree of freedom of the design of the panel component in the following points as compared with the above-described proportionality. That is, for example, the distance L in the vehicle width direction from the outermost portion in the vehicle width direction of the fender panel 10 shown in FIG. 2 to the parting position 15 with the hood 16 of the fender panel 10 is It can not be so long from the limit of. On the other hand, in the case of the present embodiment, the distance L can be set by setting the bending position, so that the distance L can be easily made longer than the above-described proportionality.

  As a result, the panel component molding method according to the present embodiment can also contribute to a significant improvement in the appearance quality (commercial quality and appearance) of the molded product.

  As described above, according to the panel component molding method according to the present embodiment, the quality of the molded product can be improved.

(Supplementary explanation of the embodiment)
As a modification of the above-described embodiment, a panel component that is a molded product after molding may have a shape that can maintain a posture on a plane with four or more points at the peripheral edge as support points. Also in this case, the bending direction with respect to the panel material in the bending step and the pressing direction with respect to the panel material in the overhang forming step are directions perpendicular to the virtual plane including all of the support points in the state of the molded product after forming. Is set to match.

  In addition, when the panel component which is a molded product after molding has a shape capable of maintaining a posture on a plane with four or more points at the peripheral edge as supporting points, the panel in a state in which the posture is maintained as in the above embodiment It is more preferable that the posture is maintained even if the component is pushed from the side. That is, when the panel component is placed on a flat surface with its peripheral end in contact with the flat surface, it is more preferable that the portion that can contact the flat surface is the support point. However, the panel parts to be applied are not limited to such.

  Further, as a modification of the above-described embodiment, the panel component which is a molded product after molding may have a shape in which the posture cannot be maintained on a plane with three or more points at the peripheral edge as support points.

  In addition, the concept of “point” of “support point” described in claim 2 includes a point in a strict sense, and, as in the above-described embodiment, it is not a point but a certain area (wide). However, it is possible to obtain the same operation and effect as those of the point in the strict sense and to be substantially recognized as the “point” of the “support point”.

  As a modification of the above embodiment, the panel component that is a molded product after molding may be a vehicle covering member such as an outer panel of a vehicle hood, an outer panel of a vehicle luggage door, or the like.

  In addition, the said embodiment and the above-mentioned some modification can be implemented combining suitably.

  Although an example of the present invention has been described above, the present invention is not limited to the above, and it is needless to say that various modifications can be made without departing from the spirit of the present invention. .

10 Fender panel (panel parts)
10A support point 10B support point 10C support point 12A curved top 20 panel material 20A top 20B peripheral edge of panel material 28 virtual plane 40 fender panel (panel parts)
40C Curved top part A Bending direction B Pressing direction P Direction perpendicular to the virtual plane Q Direction facing the curved top part

Claims (4)

A bending step of bending the panel material so as to approach the shape of the molded product having a curved shape as a whole to form a linear top;
After the bending step, the peripheral end portion of the panel material is constrained over the entire circumference, and the overhang forming step of overhanging the formed product shape with the direction along the direction facing the top portion as a pressing direction;
A method of forming a panel part having The panel part that is a molded product after molding is a shape that can maintain the posture on a plane with three or more points at the peripheral edge as supporting points,
The direction in which the bending direction with respect to the panel material in the bending process and the pressing direction with respect to the panel material in the overhang forming process are perpendicular to a virtual plane including all of the support points in the state of the molded product after molding. The method for forming a panel component according to claim 1, wherein the method is set so as to coincide with.   3. The panel component molding according to claim 2, wherein when the peripheral edge portion of the panel component is brought into contact with a flat surface and placed on the flat surface, only the support point can be contacted with the flat surface. Method. A panel component that is a molded product after molding is a vehicle fender panel having a curved top portion that is directed obliquely upward and outward in the vehicle width direction in a vehicle mounted state,
The bending direction with respect to the panel material in the bending step and the pressing direction with respect to the panel material in the overhang forming step coincide with the direction along the direction facing the curved top in the state of the molded product after molding. The method for forming a panel part according to any one of claims 1 to 3, which is set.

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