JP2008238174A - Press die for flanging work, and flanging method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a press die for flanging work and a flanging method capable of performing press-working of the flange parts of door panels, hood panel components or the like by a single process. <P>SOLUTION: The press die for flanging work is used for performing the right-angle bending of one of adjacent sides in the edge of a panel in a pressing direction as well as the negative-angle bending of the other side. The press die includes: an upper die 10 having a fixed die 15 for right-angle bending and a slide cam 20 for negative-angle bending; and a lower die 30 having a fixed punch 33 corresponding to the fixed die 15, another fixed die 35 corresponding to the slide cam 20, and a driver cam 40 for guiding the cam 20. The bending edge 21 of the slide cam 20 has a right-angle bending portion 21a provided on its top and a negative-angle bending portion 21b followed thereby. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a pressing die for flange processing and a flange processing method for bending one side adjacent to each other at right angles in the press direction at the edge of the panel and performing negative angle bending on the other side.

  Many automotive parts are pressed, and some of them are panel parts that are subjected to negative bending, such as a panel that has been processed by pressing, which covers the lower mold. On the other hand, in order to extract the panel, press working is often performed by a rotary cam press die, a double cam press die, or the like. However, for the pressing of door panels, hood panel parts, etc., where one side is bent at right angles in the pressing direction and the other side is bent at a negative angle, a complicated and expensive rotary cam press die, A processing apparatus or method that does not use a double cam press die or the like has been proposed.

  For example, in Patent Document 1, a composite press apparatus capable of simultaneously performing a right angle bending process and a negative angle bending process of an automobile hood panel in a single process, and a mechanism for extracting a processed panel from a lower mold is provided. Has been proposed. The mold of this composite press machine is negative in order to prevent interference between the mold that performs negative angle bending and the mold that performs right angle bending, and appropriately performs the bending process at the boundary between the negative angle bending part and the right angle bending part. The cam bending blade that performs corner bending is substantially L-shaped in plan view, and the negative angle bending range extends to the edge that performs right angle bending.

However, in such a composite press device, it is necessary to overlap the fixed die and the cam bending blade at the transition from the negative angle bending portion to the right angle bending portion, and deformation such as distortion or bending occurs due to the timing difference. There is a problem that it is easy to do. A composite press device for solving this problem is proposed in Patent Document 2. That is, a press bending blade that bends one of the two adjacent edges of the curved workpiece in the same direction as the pressing direction of the upper die, and the other is bent at a negative angle inward from the pressing direction of the upper die. A cam bending blade is provided, a movable bending blade is provided in a portion of the press bending blade that overlaps the cam bending blade during press processing, and the movable bending blade is retracted as the cam bending blade moves downward. There has been proposed a composite press apparatus configured to bend the two end edges simultaneously while avoiding interference between the cam bending blade and the press bending blade.
No. 6-49375 Japanese Patent No. 3013684

  However, the composite press device according to the proposal of Patent Document 2 performs negative angle bending and right angle bending simultaneously in one step in press processing of door panels, hood panel parts, etc., and further, from the negative angle bending range to the right angle bending range. Although it is possible to prevent the occurrence of deformation such as distortion and breakage of the portion transitioning to, there is an advantage, but there is a problem that a special structure such as a movable bending blade is required and the mold has a complicated structure.

  In view of the conventional problems, the present invention performs flange processing in which one side is bent at right angles in the press direction and the other side is subjected to negative angle bending at the edges of panels such as door panels and hood panel parts. It is an object of the present invention to provide a flange working press die and a flange working method that can be machined in a single process with a simple structure.

  The flange processing press die according to the present invention is a flange processing press die for bending one side adjacent to each other at a right angle in the pressing direction at the edge of the panel and negatively bending the other side. An upper die having a fixed die for performing a right-angle bending process and a slide cam for performing a negative angle bending process by sliding in a direction perpendicular to the press direction, and a fixed punch corresponding to the fixed die, A lower die having a corresponding fixed punch and a driver cam for guiding the slide cam, and the curved blade of the slide cam includes a right-angle bend forming portion provided on the top thereof, and a negative angle bend forming portion subsequent thereto. , Has.

  In the above invention, the slide cam preferably has an elastic body that urges itself to the storage position. After the fixed die and the slide cam each bend the edge of the panel at a right angle, the slide cam is in the press direction. It is preferable that a driver cam is provided so as to slide in a right angle direction and further perform bending to perform negative angle bending. Further, the mating surface of the curved blade of the slide cam and the curved blade of the fixed die is preferably located at a position that wraps around from the edge to be bent at a right angle to the edge to be bent at a negative angle.

  Moreover, in the said invention, it is good to have a panel lifter which contacts a negative angle bending flange end surface and extracts a panel from a lower mold | type. The panel lifter includes a plurality of ejectors that contact the end face of the negative angle bending flange of the panel, a connecting plate to which the ejector is integrally attached, and a predetermined range in a pulling direction in which the negative angle bending flange is detached from the lower mold. And a plurality of pressing means for urging the connecting plate in the pulling direction, and a cam follower that contacts the slide cam and holds the connecting plate in place during processing of the negative angle bending flange. It can be.

  A flange processing method according to the present invention is a flange processing method for bending one side adjacent to each other at a right angle in the press direction at the edge of the panel and performing a negative angle bend on the other side, and a right angle bending portion and The negative angle bending portion has adjacent mating surfaces.

  In the above flange processing method, the mating surface may be provided at a position that wraps around from the edge to be bent at a right angle to the edge to be bent at a negative angle.

  The pressing die for flange processing according to the present invention has a simple structure, is easy to maintain, has a negative angle bend such as a door panel, a hood panel component, etc., and its peripheral edges are a series of flanged components. Can be performed in one step.

  The best mode for carrying out the invention of a flange working press die according to the present invention will be described below with reference to the drawings. 1 and 2 are partial cross-sectional views showing the configuration of a press working mold for flange processing according to the present invention, FIG. 1 shows a portion of a mold for performing a right angle bending process, and FIG. 2 performs a negative angle bending process. The mold part is shown. As shown in FIGS. 1 and 2, the upper die 10 for the flange processing press die has an upper die holder 11 and a pad 13, and a fixed die 15 and a slide cam 20 are attached to the upper die holder 11. ing. The fixed die 15 is provided with a curved blade 16, and the slide cam 20 is provided with a curved blade 21. The curved blade 21 is formed with a right-angle bend forming portion 21a provided at the top thereof and a negative angle following the curved portion 21a. And a bent portion 21b. On the other hand, the lower die 30 of this flange processing press die has a lower die holder 31 and fixed punches 33 and 35, and the lower die holder 31 is provided with a driver cam 40.

  In this flange processing press die, as shown in FIG. 1, a fixed punch 33 corresponds to the fixed die 15 and a fixed punch 35 corresponds to the slide cam 20 as shown in FIG. The slide cam 20 is slid in the direction perpendicular to the press direction (right direction in FIG. 2) by the guidance of the driver cam 40, as will be described later. Due to this correspondence, the panel 80 is bent at a right angle between the curved blade 16 of the fixed die 15 and the fixed punch 33, and the panel is formed between the curved blade 21 of the slide cam 20 and the fixed punch 35. 80 negative angle bending flange processing is performed.

  As shown in FIG. 3, the slide cam 20 is attached to the upper mold holder 11 via attachment bolts 25. A hole 26 through which the mounting bolt 25 provided on the curved blade 21 of the slide cam 20 passes is a long hole or a hole, so that the slide cam 20 can slide freely within a predetermined range. Sliding members 28 and 29 are provided so that the sliding cam 20 can slide smoothly with respect to the upper mold holder 11 when sliding.

  As shown in FIG. 4, the curved blade 21 of the slide cam 20 has a columnar body with one of the ridge angles cut off, and the flat portion at the top is a right-angled bent molded portion 21a, and the inclined portion following this is a curved portion. This is a negative angle bending portion 21b. The inclination angle of the inclined portion is determined according to the angle of negative angle bending.

  As shown in FIG. 4, the curved blade 21 is provided with a guide groove 22 into which the driver cam 40 is inserted at a predetermined interval. The driver cam 40 is provided with a sliding member 45 on the inclined surface of the driver portion 41. As will be described later, the driver portion 41 portion of the driver cam 40 is inserted into the guide groove 22, and the slide cam 20 is pressed. It can be smoothly slid in the direction perpendicular to the direction. A sliding member 46 is also provided at the rear portion of the driver cam 40 so that the driver cam 40, which will be described later, comes into contact with the upper mold holder 11 and operates smoothly when sliding. Further, the curved blade 21 is provided with an escape portion 21C in order to avoid interference with the panel 80 and the like.

  The slide cam 20 is coupled to the upper mold holder 11 via a stopper 23 and an elastic body 24 at predetermined intervals. As will be described later, the slide cam 20 is attached to the storage position by the elastic body 24. Has come to be. As a result, play of the slide cam 20 can be eliminated and good pressing can be performed. For the elastic body 24, an elastic material such as a spring or urethane rubber can be used.

  FIG. 5 shows a layout relationship between the curved blade 16 of the fixed die 15 and the curved blade 21 of the slide cam 20. As shown in FIG. 5, in this example, three adjacent sides of the panel 80 are surrounded by the curved blade 16 and the curved blade 21 attached to the upper mold holder 11. That is, the curved blades 16A and 16B are disposed on the left and right of the panel 80 to be processed, and the curved blade 21 is disposed below. And the protrusion part 17 is provided in the edge part of the curved blades 16A and 16B, and the protrusion part 17 bites into the curved blade 21 slightly, and the curved blade 21 and the protrusion part 17 do not interfere during operation. It touches the degree. Thereby, the peripheral edge around the panel 80 can be flanged in series. The curved punch 16 and the curved blade 21 are provided with the corresponding fixed punches 33 and 35 as described above.

  With such a flange processing press die, the panel 80 can be subjected to right angle bending and negative angle bending flange processing as described below. FIG. 6 is an explanatory view showing an example of a panel processed by the flange pressing die. In FIG. 6, the shape indicated by the alternate long and short dash line is the shape before the panel 80 is processed. The shape indicated by the solid line is the shape after the panel 80 is processed. In the panel 80, the left and right edges (right angle bending flange 83) and corners (corner 85) of the panel body 81 are bent at a right angle (P region), and the lower edge (negative angle bending flange 84) is a negative angle. It is a portion to be bent (F region). A boundary portion between the P region and the F region is a boundary portion between the curved blade 21 and the curved blade 16, that is, a so-called mating surface. The negative angle bent portion is shaped to cover the fixed punch 35 as shown in FIG.

  First, when processing the panel 80, as shown in FIGS. 1 and 2, the pad 13 is lowered with respect to the panel 80 inserted on the upper surface of the fixed punches 33, 35, and between the pad 13 and the fixed punches 33, 35. The panel 80 is pressed and fixed. Next, the upper mold holder 11 is lowered, and as described above, the panel is formed by the curved blade 16, the projecting portion 17 and the fixed punch 33 of the fixed die 15, and by the curved blade 21 and the fixed punch 35 of the slide cam 20. Perform right-angle bends of the left and right edges of the 80 and the lower edge. At this time, the bent blade 21 of the slide cam 20 is subjected to right-angle bending by the right-angle bent portion 21a and the fixed punch 35 because the right-angle bent portion 21a at the top of the bending blade 21 first hits the panel 80. This is shown in FIG. The downward arrow in FIG. 7A indicates the downward direction (pressing direction) of the upper mold holder 11.

  As the upper holder 11 is lowered, when the right and left edges of the panel 80 and the lower edges of the panel 80 are bent at right angles, the panel 80 is then subjected to negative angle bending. As shown in FIG. 7B, the sliding member 45 surface of the driver portion 41 of the driver cam 40 is provided on the curved blade 21 of the slide cam 20 at the lower edge of the panel 80 where negative angle bending is performed. It comes into contact with the groove 22 (FIG. 4). When the upper mold holder 11 is further lowered, the slide cam 20 is guided by the driver portion 41 of the driver cam 40 and slides in the direction of the right arrow shown in FIG. Thereby, the lower edge of the panel 80 bent at a right angle as described above is further bent by the negative angle bending portion 21b of the curved blade 21, and the negative angle bending process is performed. As shown in FIG. 7, the driver portion 41 is in a state of being inserted between the upper mold holder 11 and the guide groove 22, but the driver portion 41 has a sliding member 45 on the surface in contact with each other, Since 46 is provided, the driver part 41 slides smoothly.

  In such right angle bending and negative angle bending of the panel 80, the slide cam 20 (curved blade 21) has an elastic body 24 attached to a stopper 23 fixed to the upper mold holder 11, as shown in FIG. It is designed to be attracted through. That is, the slide cam 20 is urged via the elastic body 24 to the contact surface with the stopper 23 that is the storage position. For this reason, the slide cam 20 can be processed with high accuracy without causing play in the right angle bending and the negative angle bending.

  When the right angle bending and the negative angle bending are thus completed, the panel 80 after the bending is released from the fixed punches 33 and 35 (lower mold 30). The panel 80 is preferably released using a panel lifter 50 as shown in FIG. FIG. 8A shows a state when the bending process of the panel 80 is completed. FIG. 8B shows a state where the panel 80 after bending is released from the lower mold 30 using the panel lifter 50.

  As shown in FIG. 8A, when the bending process is completed, the cam follower 55 of the panel lifter 50 is in contact with the curved blade 21, and the ejector 53 is below the panel 80. When the bending process is completed, first, the upper mold holder 11 and the pad 13 are raised. As the upper mold holder 11 is raised, the slide cam 20 slides to the left in FIG. 8A by the action of the driver cam 40 and the elastic body 24 and moves upward. As a result, as shown in FIG. 8B, the cam follower 55 becomes free from the curved blade 21, and the ejector 53 comes into contact with the end face of the negative angle bending flange 84 bent negative by the pressing means 57, thereby bringing the panel 80 into contact. The panel 80 is released from the lower mold 30 by pressing so as to be removed from the lower mold 30 (fixed punches 33 and 35).

  In order to release the panel 80 from the lower mold 30, it is preferable that the ejector 53 applies an equal pressing force to the end face of the negative angle bending flange 84. Therefore, for example, as in the panel lifter 50 shown in FIG. 4, it is preferable to use a panel lifter 50 in which a plurality of ejectors 53 are appropriately arranged by a plurality of pressing means 57 via the connecting plate 51. In this panel lifter 50, after the panel 80 is released from the lower mold 30, the operation is restricted by the stopper 58 or the like so that the pressing means 57 operates within a predetermined length range. Further, the mounting direction of the panel lifter 50 coincides with the bending angle direction of the negative angle bending so that the pressing force effectively acts on the end face of the negative angle bending flange 84. In the panel lifter 50, as shown in FIG. 4, the pressing means 57 is accommodated in the case 56, and the cam follower 55 is rotatably coupled to the connecting plate 51 via the bracket. The pressing means 57 can use a coil spring.

  In the above, the right angle bending and the negative angle bending process of the panel 80 by the flange processing press die according to the present invention have been described. In this flange processing press die, as described above, the curved blade 21 and the protruding portion 17 of the curved blade 16 are in contact with each other at the mating surface. That is, unlike the conventional flange processing method, the flange processing method according to the present invention does not have a portion where the curved blade that performs right-angle bending and the curved blade that performs negative-angle bending overlap. Then, as shown in FIG. 6, the mating surface is provided at a position that wraps around from the edge to be bent at a right angle to the edge to be bent at a negative angle. As a result, it is possible to prevent the occurrence of distortion and damage that are likely to occur in a portion (range of the dimension s in FIG. 6) that transitions from right angle bending to negative angle bending as in the conventional flange processing method. Further, as in the example of FIG. 6, when the mating surface is provided at the R stop of the corner 85 on the negative angle bending flange 84 side, the range of the transitioned portion may be reduced.

  The corner portion 85 is a portion subjected to drawing processing, and it becomes difficult to release the panel 80 from the lower mold 30. For this reason, the flange height of the corner portion 85 is preferably set to a height that does not cause the drawing process and does not cause overlapping wrinkles, for example, 5 mm or less.

It is a partial cross section figure which shows the part which performs the right angle bending of the press die for flange processing which concerns on this invention. It is a partial cross section figure which shows the part which performs the negative angle bending of the press die for flange processing which concerns on this invention. It is a partial cross section figure which shows the attachment relation to the upper mold | type holder of the slide cam shown in FIG. FIG. 3 is an enlarged perspective view of the slide cam shown in FIG. 1 or 2, a driver cam related thereto, and a panel lifter. It is explanatory drawing which shows the attachment state of the curved blade of the fixed die | dye attached to an upper mold | type holder, and the curved blade of a slide cam. It is a perspective view which shows the state of the panel before a state of the panel before a process, a right angle bend, and a negative angle bend completion. It is explanatory drawing which shows each state of the bending process of a panel. It is explanatory drawing which shows each state which releases a panel from a lower mold | type.

Explanation of symbols

10 Upper mold
11 Upper mold holder
13 pads
15 Fixed die
16 curved blade
17 Protrusion
20 Slide cam
21 curved blade
22 Guide groove
23 Stopper
24 Elastic body
25 Mounting bolt
26 holes
28, 29 Sliding member
30 Lower mold
31 Lower mold holder
33, 35 Fixed punch
40 Driver cam
41 Driver section
45, 46 Sliding member
50 Panel lifter
51 Connecting plate
53 Ejector
54 Bracket
55 Cam Follower
56 cases
57 Pressing means
80 panels
83 Right angle bending flange
84 Negative angle bending flange
85 corners

Claims (8)

At the edge of the panel, it is a press mold for flange processing that performs one-sided bending on the adjacent side at right angles in the pressing direction and negative-angle bending on the other side,
An upper die having a fixed die for performing right angle bending and a slide cam for performing negative angle bending;
A fixed punch corresponding to the fixed die and a lower mold having a fixed punch corresponding to the slide cam and a driver cam for guiding the slide cam,
The bending blade of the slide cam has a right-angle bend forming portion provided on the top portion thereof, and a negative angle bend forming portion that follows the right bend forming portion.   The flange pressing die according to claim 1, wherein the slide cam has an elastic body that urges the slide cam to the storage position.   A driver cam that guides the fixed die and slide cam so that the slide cam slides in a direction perpendicular to the press direction after bending the edge of the panel at a right angle, and is further bent to perform negative angle bending. The press working mold for flange processing according to claim 1 or 2, characterized by being provided.   The mating surface of the curved blade of the slide cam and the curved blade of the fixed die is located at a position that wraps around from the edge that performs right-angle bending to the edge that performs negative angle bending. The press mold for flange processing as described in Crab.   5. The flange working press die according to claim 1, further comprising a panel lifter that comes into contact with the end face of the negative angle bending flange and extracts the panel from the lower die.   The panel lifter operates within a predetermined range in a pulling direction in which the negative angle bending flange is detached from the lower mold, a plurality of ejectors contacting the negative angle bending flange end surface of the panel, a connecting plate to which the ejector is integrally attached, and the negative angle bending flange. A plurality of pressing means for urging the connecting plate in the pulling direction; and a cam follower that contacts the slide cam and holds the connecting plate in a predetermined position during processing of the negative angle bending flange. The flange pressing die according to claim 5.   A flange processing method in which one side of a panel edge is bent at right angles in the press direction and the other side is negative angle bent, and the right angle bent portion and the negative angle bent portion are adjacent to each other. A flange processing method having a mating surface.   The flange processing method according to claim 7, wherein the mating surface is provided at a position that wraps around from the edge that performs right-angle bending to the edge that performs negative angle bending.

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