JP2018176222A - Apparatus and method for manufacturing panel having character line - Google Patents

Abstract

PROBLEM TO BE SOLVED: To suppress or substantially eliminate line displacement of a panel having a character line without wrinkle generation.SOLUTION: A manufacturing apparatus 1 comprises a punch 2, and plural dies 4a, 4b which are so configured as to be moved in a vertical direction facing the punch 2, performs a press work for a blank S located between the punch 2 and the plural dies 4a, 4b, and manufactures a panel having a character line comprising a ridge line sandwiched by at least two faces. In this apparatus, a die slide mechanism 10, which advances the die 4b facing a face on a line displacement occurrence side of the blank S in a direction D on a punch tip side among directions perpendicular to a press direction V while moving said die in the press direction V, is provided.SELECTED DRAWING: Figure 2

Description

  The present invention relates to an apparatus and method for manufacturing a panel having a character line.

  In recent years, as one means for realizing high design of the exterior design of a car, for example, the outer panel of a vehicle body such as a door outer panel, fender panel, side panel, hood outer panel, rear gate outer etc. It is known to set up a character line. In particular, it is often used to provide a character line on a panel disposed on the side of the vehicle body.

  However, it is known that when the character line is provided on the panel, a line displacement which is a defect in the outer surface quality is generated. In particular, if the character line is sharp, line deviation is likely to occur. The character line being sharp means that the radius of curvature of the ridgeline of the character line is, for example, as small as 10 mm or less, or that the sandwiching angle between the two surfaces forming the ridgeline is, for example, as small as 150 ° or less. .

  1 (a) and 1 (b) are cross-sectional views for schematically explaining the occurrence of line displacement when the conventional panel manufacturing apparatus 51 is used, and FIG. 1 (a) shows an initial stage of molding. FIG. 1 (b) shows the completion of molding. The character line L is formed by performing press forming such as drawing forming or stretch forming on the blank S using the punch 2, the die 54, the blank holder 3 and further, if necessary, a die pad (not shown), The misalignment occurs at the molding stage of the character line L. Specifically, first, in the initial stage of forming shown in FIG. 1 (a), a bending crease which is a minute local bending portion in the blank S due to the mold contact of the character line forming convex part of the punch 2 (FIG. The black circle in the figure occurs unavoidably. Due to the difference in tension applied to the two faces sandwiching the character line L at the time of molding, the bending weirs produced here are outward from the character line L along the inclined surface as shown by the arrows in FIG. 1 (b). It moves and remains without disappearing even when molding is completed. As described above, the phenomenon that the bending flaws remain in the panel having the character line L is a line deviation.

  The occurrence of line displacement is considered to be the cause of occurrence of highlight breakage (deterioration in outer plate surface quality) at the portion where line displacement occurs in the highlight surface inspection of the panel. On the other hand, Patent Document 1 discloses a method of pressing a rear side outer panel that suppresses line misalignment of a character line using a punch, a split die having a first die and a second die, and a blank holder. There is. In the processing method of Patent Document 1, first, a portion including a character line is pressed by a second die and a punch, and then, while the formed character line is restrained by the second die and a punch, a blank is formed by a first die and a punch. By pressing the remaining part, the character line is formed while suppressing the line displacement.

JP 2008-100240 A

  In the invention disclosed in Patent Document 1, after pressing the portion including the character line of the blank, the remaining portion of the blank is pressed while the forming portion is restrained. Wrinkles can occur in the unrestrained portion of the blank, which can lead to skin surface defects that differ from line slips. In particular, in the case of forming a three-dimensionally curved panel, wrinkles are likely to occur.

  The present invention has been made in view of the problems of the prior art, and has an object of suppressing or substantially eliminating line displacement of a panel having a character line without causing wrinkles.

  As described above, the misalignment of the panel having the character line is caused by the fact that the bending wedge generated in the blank due to the mold (punch) in the initial stage of forming moves outward from the character line along the inclined surface during forming. It is considered to occur. For this reason, in order to suppress the line displacement, it is effective to (i) suppress the occurrence of the bending weir and (ii) to hold the generated bending weir without moving it to the outside of the character line. The present inventors earnestly studied about the above (i) and (ii), and as a result, obtained the following findings A to C and completed the present invention.

  (A) In the punch, a high surface pressure generating portion (a convex portion for forming a character line) which applies a high surface pressure to the blank from the start of the forming to the completion of forming and a surface pressure which the high surface pressure generating portion applies to the blank There is a lower contact pressure generating portion which applies a lower contact pressure to the blank. In order to relieve the surface pressure in the high surface pressure generation part, a die slide mechanism for moving the die in the lateral direction is installed, and the die is brought into contact with the end side of the blank at the start of forming to punch in the initial stage By making the bending deformation of the blank by the tip portion gentle, it is possible to suppress the occurrence of bending flaws caused by the initial contact of the punch and the blank. Then, by sliding the die in the lateral direction during press processing, the material is drawn to the character line side to form a character line. This makes it difficult for the bending rod to move from the character line.

  (B) It is possible to further suppress the occurrence of bending flaws by sliding not only the die facing the surface on the side of the line displacement occurrence of the blank but also the die opposite to the surface on the side opposite to the line displacement occurrence side .

  (C) Depending on the shape of the character line of the panel, high design of the panel can be realized by optimally designing the R shape of the divided surface of the die without designing the shape of the punch and the shape of the die in the same shape.

  That is, the present invention for solving the above problems comprises a punch and a plurality of dies configured to move in the vertical direction opposite to the punch, and disposed between the punch and the plurality of dies. A manufacturing apparatus for pressing a blank and manufacturing a panel having a character line consisting of ridge lines sandwiched by at least two surfaces, wherein a die facing the surface on which the line deviation occurs in the blank is in the pressing direction. It is characterized in that a die slide mechanism is provided which is advanced in the direction perpendicular to the pressing direction while moving, to the direction of the punch tip end side.

  The term "surface on the side of line displacement generation" according to the present invention refers to a surface on which line displacement assumed from the shape of a panel having a character line can occur. For example, when manufacturing a panel having a character line having a shape as shown in FIG. 1 (b), of the two sides of the blank constituting the character line, the side to the right of the left side in the drawing is pressing The tension in the For this reason, it is possible to assume on which surface the line deviation occurs in the case where the line deviation occurs at the stage before the press working.

  Even if another die slide mechanism is provided which advances the die facing the surface other than the line displacement occurrence side of the blank in the direction perpendicular to the press direction while moving the die in the press direction, the die is advanced toward the punch tip end side. good.

  In the punch and the die, the clearance between the punch and the die when the press die is closed is larger than the thickness before processing of the blank at the tip of the punch and separates from the tip of the punch It may have a shape which becomes gradually smaller according to and becomes smaller than the thickness of the blank before processing.

  The invention according to another aspect uses a punch and a plurality of dies configured to move up and down opposite the punch, and a press for a blank disposed between the punch and the plurality of dies. A method of manufacturing a panel having a character line comprising a ridge line sandwiched by at least two surfaces by processing, the plurality of dies being moved in the press direction, the dies being in contact with the blank After that, while moving the die opposite to the surface on the side of the line displacement of the blank in the press direction, the die is advanced in the direction perpendicular to the press direction to the side of the punch tip to perform press processing And

  The line displacement of the panel having the character line can be suppressed or substantially eliminated without the occurrence of wrinkles.

FIG. 1 (a) shows a state of an initial stage of molding, and FIG. 1 (b) shows a state at the time of completion of molding. It shows. It is a figure which shows schematic structure of the manufacturing apparatus of the panel which concerns on the 1st Embodiment of this invention. It is sectional drawing explaining temporally the press process which concerns on the 1st Embodiment of this invention. FIG. 3 (a) shows the state at the beginning of molding, FIG. 3 (b) shows the state at the middle stage of molding, and FIG. 3 (c) shows the state at the end of molding. It is sectional drawing explaining temporally the schematic structure of the manufacturing apparatus of the panel which concerns on the 2nd Embodiment of this invention, and the press process using the manufacturing apparatus. FIG. 4 (a) shows the state of the initial stage of molding, and FIG. 4 (b) shows the state at the completion of the molding. It is a figure which shows the general | schematic shape of the punch which concerns on the 3rd Embodiment of this invention, and die | dye. It is a figure which shows the shape of the panel shape | molded in an Example.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. In the following embodiment, the character line of the panel is composed of two surfaces. Further, in the present specification and the drawings, in elements having substantially the same functional configuration, the same reference numerals will be attached to omit redundant description.

First Embodiment
As shown in FIG. 2, the panel manufacturing apparatus 1 according to the first embodiment is to face the punch 2, the blank holder 3 supporting the blank S as a work material, the punch 2 and the blank holder 3. And a movable die 4 provided above the punch 2 and the blank holder 3. The blank S is a metal work material and is exemplified as a steel plate, but is not limited to a steel plate, and may be an aluminum or aluminum alloy plate, or a titanium or titanium alloy plate. Moreover, as a panel obtained by press processing, the outer panel of the vehicle body of a motor vehicle, such as a door outer panel, a fender panel, a side panel, a hood outer panel, a rear gate outer, etc. is illustrated.

  The die 4 is divided into two dies such as a first die 4a and a second die 4b, and the dies 4a and 4b are configured to move in the vertical direction. The first die 4a is disposed to face the surface of the blank S on the side of occurrence of line displacement, and the second die 4b is disposed to face the surface of the blank S not on the side of occurrence of the line displacement. The first die 4a and the second die 4b are arranged such that a gap is formed between them at the initial position. The inclined surface 5a is formed in the part which does not contact the blank S of the lower part of the 1st die | dye 4a.

  The panel manufacturing apparatus 1 moves the first die 4a in the press direction V (in the present embodiment, from the upper side to the lower side), and while the direction D perpendicular to the press direction V, on the punch tip side D The die slide mechanism 10a is advanced. The die slide mechanism 10a includes a slide member 11a for moving the first die 4a, and the slide member 11a is below the first die 4a and on the side of the blank holder 3 where the punch 2 is not provided. It is placed on the side. An inclined surface 12a is formed on the upper portion of the slide member 11a so as to face the inclined surface 5a of the first die 4a. The inclined surface 12a of the slide member 11a is formed at such a position that the inclined surface 5a of the first die 4a comes into contact when the first die 4a is lowered. Although illustration is omitted, the die slide mechanism 10a is a direction of the punch tip side while the fixing mechanism of the slide member 11a other than the slide member 11a and the first die 4a move in the pressing direction V. It has the necessary configuration to be able to move to D as well.

  It is desirable that the moving distance from the initial position of the first die 4a to the punch tip side D be 200 mm or more, or a range corresponding to the range in which the contact surface pressure between the punch 2 and the blank S is 2 MPa or more. . As the moving distance increases, the contact between the punch 2 and the blank S is alleviated, and the material of the blank S can be easily drawn to the character line side when the first die 4a slides.

  The panel manufacturing apparatus 1 of the first embodiment is configured as described above. Next, a method of manufacturing a panel having a character line using such a manufacturing apparatus will be described. The operation of the second die 4b in the first embodiment is the same as that of the prior art, and thus the description thereof is omitted.

  First, the first die 4 a is moved downward to bring the first die 4 a into contact with the blank S supported by the blank holder 3. In this state, when the first die 4a is moved further downward, the blank S contacts the tip 2a of the punch 2 as shown in FIG. 3A, and as shown in FIG. Bending deformation is started. At this time, since the first die 4a is disposed in the initial position in such a manner that a gap is formed between the first die 4a and the second die 4b, the first die 4a is moved downward along the pressing direction V. Only by moving, the gap between the first die 4a and the second die 4b remains, and the bending radius of the obtained character line becomes larger than the bending radius of the desired character line. In other words, at the stage where the bending deformation of the blank S is started by moving the first die 4a downward, the bending radius in the vicinity of the character line on the side of the line deviation of the blank S is growing. As a result, deformation in the vicinity of the character line is alleviated more than in the conventional case, and it is possible to suppress the occurrence of bending defects caused by the initial contact of the punch 2 and the blank S.

  Thereafter, when the first die 4a is further moved downward, the inclined surface 5a of the first die 4a and the inclined surface 12a of the slide member 11a come into contact with each other. Thereby, the first die 4a starts to move in the direction D on the punch tip side along the inclined surface 12a of the slide member 11a. That is, while moving in the press direction V, the first die 4a moves forward in the direction D perpendicular to the press direction V in the direction D on the punch tip end side. Along with this, the material of the blank S will be drawn toward the character line. That is, since the material is drawn in the direction opposite to the line displacement direction of the character line, it is possible to suppress the movement of the generated bending wedge from the character line to the outside even if the bending flaw is generated.

  As described above, according to the panel manufacturing apparatus 1 of the first embodiment, it is possible to suppress the generation of the bending flaw due to the initial contact of the punch 2 and to suppress the movement of the generated bending flaw from the character line. Can. That is, it is possible to suppress line deviation at the time of character line formation. Moreover, since the whole blank is restrained at the time of closing die of a press die, it becomes possible to control generating of a wrinkle of blank S at the time of formation of a character line. Therefore, according to the panel manufacturing apparatus 1 of the first embodiment, it is possible to manufacture a panel having an appearance quality superior to that of the conventional one.

Second Embodiment
As shown in FIGS. 4 (a) and 4 (b), in the panel manufacturing apparatus 1 according to the second embodiment, the second die 4b is moved in the press direction V while moving in the direction of the punch tip end. Another die slide mechanism 10b for advancing to D is further provided. That is, the apparatus for manufacturing a panel 1 of the second embodiment includes, as a die slide mechanism, a first die slide mechanism 10a for sliding the first die 4a and a second die slide for sliding the second die 4b. A mechanism 10b is provided.

  The second die slide mechanism 10b includes a slide member 11b for moving the second die 4b. The slide member 11b is provided with the punch 2 of the blank holder 3 below the second die 4b. There is no side-side arrangement. An inclined surface 12 b is formed on the upper portion of the slide member 11 b so as to face the inclined surface 5 b of the second die 4 b. The inclined surface 12b of the slide member 11b is formed at such a position that the inclined surface 5b of the second die 4b comes into contact when the second die 4b is lowered. Although the illustration is omitted, the second die slide mechanism 10b is a punch tip end portion while the slide mechanism 11b, the fixing mechanism of the slide member 11b, and the second die 4b move in the pressing direction V. It has the necessary configuration to be able to move in the side direction D as well.

  According to the panel manufacturing apparatus 1 of the second embodiment, the first die 4b as shown in FIG. 4B is moved downward to start bending deformation of the blank S. For the same reason as the pressing process of the embodiment, the deformation in the vicinity of the character line on the surface of the blank S which is not the line displacement occurrence side is alleviated. That is, in the panel manufacturing apparatus 1 of the second embodiment, since the first die 4a and the second die 4b are configured to slide together, deformation near the character line at the beginning of molding is further alleviated. Ru. As a result, with respect to the panel manufacturing apparatus 1 of the first embodiment, it is possible to further suppress the occurrence of bending flaws due to the initial contact of the punch 2.

Third Embodiment
Similar to the second embodiment, the panel manufacturing apparatus 1 according to the third embodiment is configured such that the first die 4a and the second die 4b slide. As shown in FIG. 5, in the third embodiment, the surface of each die 4a, 4b facing the punch 2 is not parallel to the punch surface but inclined. Specifically, in the punch 2 and the die 4, the clearance CL between the punch 2 and the die 4 at the time of closing the press die is larger than the plate thickness before processing of the blank S at the punch tip portion 2 a and It is formed so that it may become small gradually as it separates from tip part 2a, and may become smaller than plate thickness before processing of blank S in peripheral part 2b of a punch upper surface.

  When pressing is performed with the punch 2 and the die 4 having such shapes, when the first die 4a and the second die 4b slide in the direction D on the punch tip side, a portion separated from the punch tip 2a Then, since the clearance CL between the punch 2 and each die 4a, 4b is smaller than the thickness of the blank S before processing, and the clearance CL gradually decreases toward the punch tip, each die 4a, 4b The material of the blank S is pushed toward the character line at the time of sliding. Then, in the punch tip 2a, since the clearance CL between the punch 2 and the die 4 is larger than the thickness of the blank S before processing, the material brought close from the peripheral edge 2b of the punch upper surface is punched with the punch 2 at the punch tip 2a. It is filled between the dies 4 to form a character line. Thereby, it becomes possible to form a sharp character line which can not be obtained by the press die in the case where the clearance CL between the punch 2 and the die 4 is the same as the thickness of the blank S before processing. That is, according to the panel manufacturing apparatus 1 of the third embodiment, it is possible to suppress the line displacement of the character line and to form a sharp character line.

  In the first to third embodiments, molding of a character line configured by being sandwiched between two surfaces has been described, but three or more press processes as in the first to third embodiments are performed. The present invention can also be applied to forming a character line composed of faces. In that case, the die 4 facing the punch 2 increases in accordance with the number of faces constituting the character line. Even when a plurality of dies are provided, there is a slide mechanism for advancing the die in the direction perpendicular to the press direction toward the punch tip end while moving the die facing the surface on the line deviation occurrence side of the blank in the press direction. If it is provided in the manufacturing apparatus 1 of a panel, the line shift inhibitory effect of a character line can be acquired.

  Further, in the present embodiment, pressing such as draw forming or stretch forming is performed using the punch 2, the die 4, and the blank holder 3, but for example, the punch 2, the die 4, and the die pad (not shown) Pad bending may be performed using this. In addition, a mold configuration may be employed in which the punch 2 is disposed on the upper side and the die 4 is disposed on the lower side.

  As mentioned above, although embodiment of this invention was described, this invention is not limited to this example. It is apparent that those skilled in the art can conceive of various changes or modifications within the scope of the technical idea described in the claims, and the technical scope of the present invention is also natural for them. It is understood to belong to

  In order to examine the effect of the press working according to the present invention, a forming test was performed using a blank having a width of 100 mm and a length of 300 mm, which is made of a plated steel sheet having a thickness of 0.7 mm and a tensile strength of 270 MPa. The apparatus of the structure shown in FIG. 2 was used as a manufacturing apparatus of the panel based on this invention. The slide distance (moving distance in the direction perpendicular to the pressing direction) of the die facing the surface on the side of the line displacement of the blank was 100 mm. In addition, the cross-sectional shape of the panel after shaping | molding is as showing in FIG. 6, and the curvature radius of a character line is 5 mm. Also, the radius of curvature of the punch tip is 5 mm.

  In addition, as a comparative example, a forming test was performed using the same material and the same size blank. For comparison with the above example, a conventional die without die slide mechanism was used.

  After the forming test, the evaluation of the line deviation was carried out by calculating the line deviation evaluation value which is the product of the height and the length of the line deviation generated around the character line for each panel obtained by press working. The panel obtained by the manufacturing apparatus according to the present invention had a line displacement evaluation value of 0.8, and no line displacement could be confirmed even by visual evaluation. In the panel of the comparative example, the line displacement evaluation value was 2.2, and a clear line displacement could be confirmed also in the visual evaluation. That is, by providing the elastic body at the tip of the punch, it was possible to suppress the line displacement at the time of molding of the character line.

  The present invention can be applied to the manufacture of panels having character lines.

DESCRIPTION OF REFERENCE NUMERALS 1 panel manufacturing apparatus 2 punch 2 a punch tip 2 b punch peripheral edge 3 blank holder 4 die 4 a first die 4 b second die 5 a first die inclined surface 5 b second die inclined surface 10 a die Slide mechanism (first die slide mechanism)
10b Die slide mechanism (second die slide mechanism)
11a slide member 11b slide member 12a inclined surface 12b of slide member inclined surface 51 of slide member conventional panel manufacturing apparatus 54 conventional die CL die-to-die clearance when closing die D direction of punch tip side L character line S blank V press direction

Claims (4)

A punch comprising: a punch; and a plurality of dies configured to move up and down opposite the punch, wherein a blank disposed between the punch and the plurality of dies is pressed and at least two sides A manufacturing apparatus for manufacturing a panel having a character line consisting of ridge lines sandwiched by
The die slide mechanism is provided for advancing the die in the direction perpendicular to the pressing direction while moving the die opposed to the surface on the line displacement occurrence side of the blank in the pressing direction, to the direction of the punch tip end side. The manufacturing apparatus of the panel which has a character line.   There is provided another die slide mechanism for advancing the die in the direction perpendicular to the pressing direction while moving the die facing the surface other than the line displacement occurrence side of the blank in the pressing direction, to the direction of the punch tip end. The manufacturing apparatus of the panel which has a character line of Claim 1 characterized by these.   In the punch and the die, the clearance between the punch and the die when the press die is closed is larger than the thickness before processing of the blank at the tip of the punch and separates from the tip of the punch The apparatus for manufacturing a panel having a character line according to claim 1 or 2, characterized in that it has a shape that gradually becomes smaller according to and smaller than the thickness of the blank before processing. By using a punch and a plurality of dies configured to move in the vertical direction opposite to the punch, at least two of the blanks disposed between the punch and the plurality of dies are pressed. A method of manufacturing a panel having a character line consisting of ridges sandwiched by two faces,
The plurality of dies are moved in the press direction, and after the dies contact the blank, the die opposed to the surface of the blank on the side where the linear displacement occurs is moved in the press direction, and the direction perpendicular to the press direction Among them, a method of manufacturing a panel having a character line, characterized in that the press processing is performed by advancing in the direction of the punch tip end side.

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