JP4581494B2 - Mold apparatus and panel forming method - Google Patents

Description

  The present invention relates to a mold apparatus and a panel forming method, and more particularly to a forming technique for a panel having a portion where a forming amount changes.

  For example, when the drawn panel is finally formed into a predetermined shape, cracks and wrinkles may occur depending on the part of the panel. As an example of a technique for suppressing the occurrence of cracks and wrinkles, a processing method described in Patent Document 1 is disclosed.

  In this processing method, a draw-formed panel is set on a movable die, and the flange of the panel is pressed against the movable die side by a close-up bending blade. The panel is drawn in advance so that the distance from the abutting position to the end of the bending process is the same for all the parts of the flange to be bent and formed.

In this way, the processing timing can be made the same over the entire length of the bent portion of the flange, the occurrence of local expansion and contraction can be absorbed, and the generation of cracks and wrinkles can be suppressed. it can.
JP-A-7-214183 (Pages 3 and 4; FIGS. 1 and 2)

  However, the processing method described in Patent Document 1 does not take into account the molding in which the molding amount becomes zero (that is, the molding is not performed) in the length direction of the flange, and when molding such a panel, flange molding is performed. Wrinkles occur in the vicinity of the part where the amount becomes zero.

  Then, an object of this invention is to provide the metal mold | die apparatus and panel molding method which can suppress generation | occurrence | production of a wrinkle.

According to the present invention , a draw-formed panel before the final product shape is formed into a predetermined shape, in which a portion that is originally scrap is left as a final product shape in a portion where the molding amount of the panel forming portion is reduced as compared with other portions. It is a mold device. In the present invention, a die for positioning and holding the panel, a slide punch having a first punch forming portion for forming the panel into a predetermined shape in cooperation with the die, and a slide front surface of the slide punch are fixed. And having a second punch forming portion projecting forward from the first punch forming portion, and contacting the second punch forming portion prior to the first punch forming portion with respect to the scrap portion . An auxiliary punch for forming the panel , and at the start of the processing of the panel , at least the auxiliary punch of the slide punch and the auxiliary punch comes into contact with the entire range of the scrap .

According to the mold apparatus of the present invention, at the start of the panel processing, at least the auxiliary punch contacts the entire range of the scrap punch and the auxiliary punch as scrap. Molding can be performed. Thereby, it can shape | mold without producing wrinkle also with respect to the panel which has the site | part from which the shaping | molding amount differed in the panel longitudinal direction, and a high quality panel can be manufactured with sufficient productivity.

  Hereinafter, specific embodiments to which the present invention is applied will be described in detail with reference to the drawings.

“Configuration and operation of mold equipment”
As shown in FIG. 1, the mold apparatus according to the present embodiment includes a lower mold 1, an upper mold 2 that is movable toward and away from the lower mold 1, and a die 3 that is fixed to the lower mold 1. A slide punch 5 for forming the drawn panel 4 into a predetermined shape in cooperation with the die 3, an auxiliary punch 6 fixed to the slide punch 5 for forming a scrap portion, and the panel 4 as the die A work pressing member 7 for pressing to the 3 side and a cam member 8 for sliding the slide punch 5 to the die 3 side are provided.

  The lower mold 1 is fixed on a base (not shown) of the press machine. The upper die 2 is attached to a ram (not shown) of the press machine, and moves up and down in the approaching and separating direction with respect to the lower die 1 by the vertical movement of the ram. The die 3 is fixed to a lower holder 9 fixed on the lower mold 1, and the panel 4 that has been drawn into a desired shape is positioned and held.

  The slide punch 5 is slidable with respect to the lower holder 9 and is always pulled in a direction away from the die 3 by a coil spring (not shown). When the upper die 2 moves from the top dead center to the bottom dead center, the slide punch 5 is pushed by a cam member 8 (to be described later) and approaches the die 3 side to cooperate with the die 3 to make the panel 4 Is molded into the final product shape.

The slide punch 5 is formed with a punch forming part 10 for forming a forming part (a flange part in the present embodiment) of the panel 4 formed by drawing. In addition, the slide punch 5 is formed with an abutting surface 21 that abuts against a cam member 8 described later as an inclined surface.

  The auxiliary punch 6 has a punch forming portion 11 for forming a portion that is originally scrap, and is fixed to the slide front surface of the slide punch 5. In the present embodiment, the punch forming portion 11 of the auxiliary punch 6 protrudes forward from the punch forming portion 10 of the slide punch 5 according to the final product shape.

  The work pressing member 7 is fixed to a cam member 8 fixed to the upper mold 2 via an elastic member 12. The work pressing member 7 has several panel pressing portions 13A and 13B for pressing a required portion of the panel 4 that has been drawn and formed in the previous stage of processing by the mold apparatus of the present embodiment. The elastic member 12 bends to the maximum when the press machine reaches bottom dead center, prevents the panel 4 from being crushed by the work pressing member 7, and returns to the original position when the press machine reaches top dead center. Return to the state. For example, urethane or a coil spring is employed for the elastic member 12.

The cam member 8 is fixed to the upper die 2 and is brought into contact with a contact surface 21 formed on the slide punch 5 when moving, thereby sliding the slide punch 5 to the die 3 side. The cam member 8 is formed with a pressing surface 14 having the same inclination angle as the contact surface 21 . When the pressing surface 14 comes into surface contact with the contact surface 21 and the cam member 8 is lowered, the slide punch 5 is slid toward the die 3 by being pressed by the cam member 8.

  Next, a brief description will be given of the molding operation by the mold apparatus configured as described above.

  First, when the upper die 2 is lowered with respect to the lower die 1 from the top dead center state in FIG. 1, the work pressing member 7 fixed to the upper die 2 is placed on the die 3 as shown in FIG. 2. The panel 4 positioned on the die 3 is pressed against the die 3 side. Accordingly, the panel 4 is positioned and fixed by being sandwiched between the work pressing member 7 and the die 3.

  When the panel 4 is pressed by the work pressing member 7, the pressing surface 14 of the cam member 8 contacts the contact surface 21 of the slide punch 5 this time. When the upper die 2 is further lowered, the slide punch 5 is pushed toward the die 3 by being pushed by the cam member 8, and the punch forming portion 10 formed on the slide punch 5 and the punch forming portion of the auxiliary punch 6. 11, the panel 4 is formed. At the bottom dead center shown in FIG. 3, the molding of the panel 4 is completed.

  Then, when the upper die 2 reaches the bottom dead center, the upper die 2 rises in a direction away from the lower die 1 as shown in FIG. 4, and finally the upper die 2 reaches the top dead center position. . In the state shown in FIG. 4, the molded panel 4 is taken out from the die 3.

[Explanation of molding process at each part of panel]
Next, the molding process state in each part of the panel 4 will be described in detail. FIG. 5A is a plan view showing an example of a body side panel for an automobile, and FIG. 5B is an enlarged plan view of a main part in the X part of FIG.

  In the present embodiment, the flange portion (the portion indicated by shading) formed on the outer peripheral edge portion of the body side panel having a shape as shown in FIG. 5 is formed by the above-described mold apparatus. Further, in this embodiment, a shape obtained by adding a portion (a gray notation portion in FIG. 5B) that originally becomes scrap to prevent wrinkles is used as a final product shape. This gray portion is a scrap portion that does not remain as a final product in the prior art, and this gray portion is not formed on the panel 4 during flange molding. In the present embodiment, this originally scraped portion is formed on the panel 4 formed by drawing in the previous process.

  FIG. 6 is an enlarged cross-sectional view of the main part of the mold at each part at the start of the molding process. FIG. 6 (A) is a cross-sectional view taken along line AA of FIG. 5 (B), and FIG. BB cross-section of FIG. 5B and FIG. 5C are CC cross-sections of FIG. The time when the forming process is defined here means a state in which the punch first comes into contact with the panel 4.

As described above, when the panel 4 having the final product shape as a part that is originally scrap is formed, the slide punch 5 and the cross-sectional position at any position of the A-section position, the B-section position, and the C-section position in the processing start state. The auxiliary punch 6 hits the molded part of the panel 4. That is, at the time of starting the forming process by the punch, at least the punch forming portion 11 of the auxiliary punch 6 out of the slide punch 5 and the auxiliary punch 6 has a C cross section from the A cross section position with respect to the forming portion (panel forming portion) of the panel 4. Touch the entire range of positions simultaneously. Of course, the slide punch 5 and the auxiliary punch 6 hit not only the range from the A sectional position to the C sectional position but also all the panel forming ranges at the start of processing.

  When the upper die 2 is further lowered from this state, the entire panel forming range is formed by the slide punch 5 and the auxiliary punch 6 according to the forming amount at each part. At this time, since all the panel forming parts are in contact with the slide punch 5 and the auxiliary punch 6 at the start of the forming process, the panel 4 is formed in a state where the panel 4 is pressed down at each part. In particular, a portion indicated by a Y portion in FIG. 5B is a portion where the change in the outer shape is large, so that the molding amount changes and wrinkles are likely to occur. However, since this Y portion is originally provided with a portion that becomes scrap, there is no rapid change in the amount of molding, so that the generation of wrinkles can be suppressed.

  FIG. 7 is an enlarged cross-sectional view of the main part of the mold at each part at the end of the molding process. FIG. 7 (A) is a cross-sectional view taken along line AA of FIG. 5 (B), and FIG. BB cross-section of FIG. 5B and FIG. 5C are CC cross-sections of FIG. FIG. 8 is an enlarged cross-sectional view of the main part of the mold at the end of the molding process. When the press machine reaches the bottom dead center, as shown in FIGS. 7 and 8, the molding at each cross-sectional position of the panel molding portion is completed.

  9 to 12 show the processed state of the panel and the mold when molded by the mold apparatus of the present embodiment. FIG. 9 shows a state when the panel is pressed by the workpiece pressing member. In this state, the slide punch 5 and the auxiliary punch 6 are not in contact with the panel 4 since they are not yet processed. In FIG. 9A, a region surrounded by the outer peripheral portion of the panel 4 and a broken line indicates a panel molding portion that is molded by the mold apparatus of the present embodiment.

  FIG. 10 shows a state in which the processing has further progressed after the slide punch 5 and the auxiliary punch 6 are simultaneously in contact with the entire panel forming portion at the start of the forming processing. Since either one or both of the slide punch 5 and the auxiliary punch 6 are in contact with the entire range, these punches press the panel forming portion over the entire area, so that the undulation at both ends of the panel is suppressed.

  FIG. 11 shows a state immediately before the end of the forming process, and FIG. 12 shows a state at the end of the forming process. In these states, the occurrence of wrinkles in the Z portion where wrinkles are particularly likely to occur is reduced. I understand. In this way, the shape that originally provided the portion that would become scrap is the final product shape of the panel 4, and either or both of the slide punch 5 and the auxiliary punch 6 from the start of processing by the punch to the end of processing are used as the panel. Generation of wrinkles can be suppressed by bringing them into contact with the molded part almost simultaneously. Therefore, the panel 4 with less wrinkles can be manufactured with a high yield.

In addition, in the conventional mold apparatus and the panel molding method in which the auxiliary punch 6 is not provided in a portion that originally becomes a scrap and all punches do not hit the panel molding portion at the start of molding processing, undulation is generated during molding. Wrinkles occur. As shown in FIG. 13, in the Y portion where the forming amount of the panel forming portion changes abruptly, the punch forming portion 10 of the slide punch 5 is located at the C cross section at the start of the forming process as shown in FIG. However, the slide punch 5 is in a non-contact state with the panel forming portion at all other A cross-sectional positions and B cross-sectional positions.

  Therefore, as can be seen from the processing state of the panel and the mold (see FIGS. 15 to 18) when the molding is performed by the conventional mold apparatus, in the state where the processing is started from the start of the molding processing shown in FIG. It can be seen that waviness occurs in the portion (the range indicated by the arrow in the figure), and the waviness is wrinkled as the molding proceeds. That is, in this conventional method, in the part where the molding amount is extremely reduced in the panel molding part, the part where the slide punch 5 hits the panel molding part and the part which does not hit the part appear. Since the panel cannot be attached, the panel is pulled at the portion where the punch hits, and the undulation is generated, and the undulation finally becomes a wrinkle.

As described above, according to this embodiment, during molding start of the panel 4, at least the auxiliary punches 6 of the slide punch 5 and the auxiliary punch 6, since the contact with the full range of parts made with the scrap, all The forming process can be performed at the same timing at the same position. Thereby, it can shape | mold without producing generation | occurrence | production of wrinkles with respect to the panel 4 from which a shaping | molding amount changes in a panel longitudinal direction, and can produce the panel 4 with high quality with sufficient productivity.

Further, according to the present embodiment, in addition to the above-described effects, the slide punch 5 and the auxiliary punch 6 are particularly applied to the panel forming portion excluding the portion that becomes the scrap from the start of the forming process of the panel 4 to the end of the forming process. if both of the punch so as to be in contact with the simultaneous, panel shaped portion from the molding process start to the molding ends always pressing it, it is possible to further reduce the occurrence of wrinkles suppressing waviness.

  In addition, according to the present embodiment, the wrinkle occurrence state can be seen and the molding process start timing can be changed intentionally, so that the wrinkle can be easily adjusted. For example, the molding processing start timing is changed by changing the protruding amount of the auxiliary punch 6 fixed to the slide punch 5 with respect to the slide punch 5.

  Further, according to the present embodiment, since the part that originally becomes the scrap is the final product shape, a dedicated trimming die including the scrap cutting die 15 and the punch 16 for cutting the scrap part as shown in FIG. 19 is provided. do not need. Therefore, it is possible to reduce the die cost.

[Other embodiments]
Although specific embodiments to which the present invention is applied have been described above, the present invention is not limited to the above-described embodiments, and various modifications can be made.

For example, as shown in FIGS. 20 and 21, a trimming punch 17 is provided between the slide punch 5 and the auxiliary punch 6 to cut a part of a portion that originally becomes scrap immediately before the final product shape processing. The trimming punch 17 is provided with an eject pin 19 for discharging the cut scrap 18. The eject pin 19 fixes the main body portion 20 in a hole portion penetrating the trimming punch 17 so that the eject pin 19 can freely move in and out of the main body portion 20.

  In this way, if the trimming punch 17 is provided between the slide punch 5 and the auxiliary punch 6, an extra shape portion can be cut with the trimming punch 17 after the panel molding portion is molded. A single mold apparatus can perform from molding to trimming, and the trimming process and trimming mold can be reduced.

  Further, since the trimming punch 17 is provided with the eject pin 19, the scrap 18 trimmed by the eject pin 19 can be reliably discharged from the mold, and the scrap 18 does not remain on the auxiliary punch 6. Can be.

It is sectional drawing in the time of a top dead center which shows the metal mold | die apparatus of this Embodiment. It is sectional drawing at the time of the shaping | molding process start which shows the metal mold | die apparatus of this Embodiment. It is sectional drawing in the time of bottom dead center which shows the metal mold | die apparatus of this Embodiment. It is sectional drawing at the time of the workpiece | work taking out which shows the metal mold | die apparatus of this Embodiment. FIG. 5A is a plan view showing an example of a body side panel for an automobile, and FIG. 5B is an enlarged plan view of a main part in the X part of FIG. It is a principal part expanded sectional view of the metal mold | die in each site | part at the time of a shaping | molding process start, the figure (A) is AA cross section of FIG. 5 (B), and the same figure (B) is B-- of FIG. 5 (B). B cross section and FIG. 5C are CC cross sections of FIG. 5B. It is a principal part expanded sectional view of the metal mold | die in each site | part at the time of completion | finish of a shaping | molding process, The figure (A) is AA cross section of FIG. 5 (B), The same figure (B) is B-- of FIG. 5 (B). B cross section and FIG. 5C are CC cross sections of FIG. 5B. It is a principal part expanded sectional view of the metal mold | die at the time of completion | finish of a shaping | molding process. It is the top view and sectional drawing which show the processing state of a panel and a metal mold | die when shape | molded with the metal mold apparatus of this Embodiment, and shows the state before a shaping | molding process. It is the top view and sectional drawing which show the processing state of a panel and a metal mold | die when shape | molded by the metal mold apparatus of this Embodiment, and shows a shaping | molding process start state. It is the top view and sectional drawing which show the processing state of a panel and a metal mold | die when shape | molded with the metal mold apparatus of this Embodiment, and shows the state just before completion | finish of a shaping | molding process. It is the top view and sectional drawing which show the processing state of a panel and a metal mold | die when shape | molded by the metal mold apparatus of this Embodiment, and shows the completion | finish state of a shaping | molding process. It is a principal part enlarged plan view which shows an example of the conventional body side panel. It is a principal part expanded sectional view of the metal mold | die in each site | part at the time of a shaping | molding process start at the time of shape | molding the conventional body side panel, The figure (A) is the AA cross section of FIG. ) Is a BB cross section of FIG. 13B, and FIG. 13C is a CC cross section of FIG. 13B. It is the top view and sectional drawing which show the processing state of a panel and a metal mold | die when shape | molded with the conventional metal mold apparatus, and shows the state before a shaping | molding process. It is the top view and sectional drawing which show the processing state of a panel and a metal mold | die when shape | molded with the conventional metal mold apparatus, and shows a shaping | molding process start state. It is the top view and sectional drawing which show the processing state of a panel and a metal mold | die when shape | molded with the conventional metal mold apparatus, and shows the state just before completion | finish of a shaping | molding process. It is the top view and sectional drawing which show the processing state of a panel and a metal mold | die when shape | molded with the conventional metal mold apparatus, and shows the completion | finish state of a shaping | molding process. It is a principal part expanded sectional view of the trimming metal mold | die which cuts a scrap part. FIG. 6 is an enlarged cross-sectional view of a main part of a mold in which a trimming punch is provided between a slide punch and an auxiliary punch according to another embodiment of the present invention. FIG. 6 is an enlarged cross-sectional view of a main part of a mold when scrap is discharged by an eject pin after trimming according to another embodiment of the present invention.

Explanation of symbols

1 ... Lower mold 2 ... Upper mold 3 ... Die 4 ... Panel (work)
5 ... Slide punch 6 ... Auxiliary punch 7 ... Work pressing member 8 ... Cam member 10, 11 ... Punch forming part 17 ... Trimming punch 18 ... Scrap 19 ... Eject pin

Claims (6)

A mold device that molds a panel that has been drawn into a predetermined shape before the final product shape, leaving the original scrap shape as a final product shape in a part where the molding amount of the panel molding part is reduced compared to other parts. There ,
With the lower mold,
An upper mold that is movable toward and away from the lower mold;
A die for positioning and holding the panel fixed to the lower die,
A slide punch provided on the lower mold so as to be slidable, and having a first punch forming part for forming the panel into a predetermined shape in cooperation with the die;
A second punch forming portion projecting forward from the first punch forming part of the fixed to the slide front surface of the slide punch Rutotomoni the slide punch, first the slide punch against the site to be the scrap An auxiliary punch for forming the second punch forming part in contact with the second punch forming part prior to the punch forming part ;
A work pressing member that is fixed to the upper mold and presses the panel placed on the die against the die side;
A cam member that is fixed to the upper mold and is in contact with a part of the slide punch when moving, and slides the slide punch toward the die;
At the machining start of the panel, the mold apparatus, wherein at least the auxiliary punch contacts the entire range of a portion serving as the scrap of said slide punch the auxiliary punch. The mold apparatus according to claim 1,
From the start of processing the panel to the end of processing, both the slide punch and the auxiliary punch are simultaneously in contact with a panel forming portion excluding the scrap portion . The mold apparatus according to claim 1 or 2, wherein
A die device is provided between the slide punch and the auxiliary punch, wherein a trimming punch for cutting a part of the portion that is originally scraped immediately before the end of processing is provided. The mold apparatus according to claim 3, wherein
A mold apparatus, wherein the trimming punch is provided with an eject pin for discharging the cut scrap. The part that originally becomes scrap is left as the final product shape in the part where the molding amount of the panel forming part is reduced compared to other parts, and the drawn panel before the final product shape is cooperated with the die and punch When molding into a predetermined shape by
The panel forming method according to claim 1, wherein the punch is brought into contact with the entire range of the portion that becomes the scrap when the processing of the panel is started. The panel forming method according to claim 5,
The panel forming method, wherein the punch is brought into contact with the entire panel forming portion from the start of processing of the panel to the end of processing , including the portion that becomes the scrap .