JP4924539B2 - Press working apparatus and press working method - Google Patents

Description

  The present invention relates to a press processing apparatus and a press processing method.

  Panel parts such as a front fender used in a vehicle are formed by pressing a panel-shaped workpiece by a press processing apparatus. In the press work, for example, there is a process of forming a flange portion by bending an edge portion of a workpiece and further forming a pierce hole in the formed flange portion.

By the way, patent document 1 is disclosing the press work apparatus which can perform several types of press work in the same process by making it the double acting structure which operates several tools, such as a die | dye and a piercing punch, providing a time difference. . Since this press working device has a double-action structure, when the workpiece is pressed with the first machining tool, the machining tool to be performed later should not come into contact with the workpiece. Can do. Therefore, it is possible to perform a plurality of types of pressing in the same process while preventing the workpiece from being damaged.
JP 2003-33826 A

  However, the structure for double-acting is complicated, and the time required for the operation switching operation is also required.

  An object of the present invention is to form a flange portion and a pierce hole in the same process while preventing the workpiece from being scratched. In addition, the structure for that is simple and a series of processing can be performed quickly. Another object of the present invention is to provide a press working apparatus and a press working method that can be performed.

  In order to achieve the above object, a press working apparatus according to the present invention is a press working apparatus for forming a flange part by bending an edge part of a panel-like workpiece and forming a pierce hole in the flange part. A first die in which a piercing punch for forming the piercing hole is fixed to a die for forming a portion, and the molding of the flange portion and the piercing between the first die and the workpiece A second mold for forming the hole. In the first mold, the tip of the pierce punch is not brought into contact with the flange until the first mold moves relatively closer to the workpiece and starts forming the pierce hole. A spacing member for holding is provided.

  Further, the press working method according to the present invention for achieving the above object is a press working method for forming a flange portion by bending an edge portion of a panel-like workpiece and forming a pierce hole in the flange portion, First, between the first mold in which a pierce punch for forming the pierce hole is fixed to a die for forming the flange part, and the flange part with respect to the workpiece, The workpiece is set between a second die for forming and forming the pierce hole. Next, the first mold moves relative to the workpiece to form the flange portion by the die, and the separation provided in the first mold until the forming of the pierce hole is started. The tip of the piercing punch is held by the member at a position where it does not contact the flange. Then, the first mold moves relatively closer to the workpiece, and the pierce hole is formed in the flange portion by the pierce punch.

  According to the present invention, the flange portion and the pierce hole can be formed in the same process while preventing the workpiece from being damaged. In addition, since the flange part and the pierce hole are formed in the same process, it is only necessary to move the first mold, so that the mold structure is simpler than the double-acting structure, and the operation is improved. Since the time required for the switching work is not required, a series of processing can be performed quickly.

  Embodiments of the present invention will be described below with reference to the drawings.

  1 is a cross-sectional view showing a main part of a press working apparatus 10 according to the present invention, FIG. 2 is a cross-sectional view showing a first mold 20 shown in FIG. 1, and FIG. FIG. 3B is a cross-sectional view showing a state when the piercing hole 62 is being formed. 4A is a view showing a front fender 60 as an example of a panel part formed by pressing, FIG. 4B is a cross-sectional view taken along line 4B-4B in FIG. 4A, and FIG. These are sectional drawings which show the state which supplied the workpiece | work W in which primary forming was complete | finished to the press work apparatus 10. FIG.

  Referring to FIG. 1, a press working apparatus 10 according to the present invention is used to form a flange portion 61 by bending an edge Wa of a panel-like workpiece W and to form a pierce hole 62 in the flange portion 61. In general, the press working apparatus 10 includes a first die 20 in which a pierce punch 22 for forming a pierce hole 62 is fixed to a die 21 for forming a flange portion 61, and a first die 20. The second mold 30 that performs the molding of the flange portion 61 and the molding of the piercing hole 62 with respect to the workpiece W is provided between the first mold 20 and the first mold 20 relative to the workpiece W. And a separating member 40 for holding the tip 22a of the piercing punch 22 in a position where it does not come into contact with the flange 61 until the molding of the piercing hole 62 is started.

  When performing press processing using the press processing apparatus 10 described above, first, the workpiece W is set between the first mold 20 and the second mold 30. Next, the first die 20 moves relatively close to the workpiece W to form the flange portion 61 by the die 21 and the separation provided in the first die 20 until the forming of the pierce hole 62 is started. The member 40 holds the tip 22a of the pierce punch 22 at a position where it does not contact the flange 61. Then, the first die 20 is moved relatively closer to the workpiece W, and the pierce hole 62 is formed in the flange portion 61 by the pierce punch 22. Details will be described below.

  4A and 4B, a front fender 60 as an example of a panel component is formed by pressing a panel-shaped workpiece W. In the front fender 60, the edge portion Wa of the workpiece W is bent to form a flange portion 61, and a pierce hole 62 is further formed in the formed flange portion 61.

  Referring to FIG. 1, in this embodiment, a movable die 20 as a first die is provided to move closer to and away from a punch 30 as a second die. The movable die 20 moves back and forth in the left-right direction in the figure. The moving mechanism of the movable die 20 is not particularly limited. For example, a mechanism for moving the movable die 20 in the lateral direction by bringing a cam driver that moves up and down into contact with an inclined surface provided on the movable die 20 or the movable die 20 directly. A known mechanism such as a mechanism for moving in the lateral direction can be appropriately employed.

  A pad 50 for holding the workpiece W set between the movable die 20 and the punch 30 is provided above the punch 30. The pad 50 is provided so as to be movable up and down in the vertical direction in the figure. By lowering the pad 50 and pressing the workpiece W against the punch 30, the workpiece W is held at a predetermined position.

  Referring to FIG. 2, the movable die 20 includes a wrist-like die 21 (corresponding to a die) for forming a flange portion 61 and a pierce punch 22 for forming a pierce hole 62. The pierce punch 22 is fixed. The front end 22 a of the pierce punch 22 protrudes from the molding surface 23 of the wrist-like die 21. The protruding dimension is the dimension h. A recess 24 is provided in the molding surface 23.

  The spacing member 40 is formed of a protrusion 41 provided on the wrist die 21, and the tip 41 a of the protrusion 41 is closer to the flange 61 than the tip 22 a of the pierce punch 22.

  In addition to the protrusion 42 provided to hold the tip 22a of the piercing punch 22 in a position where it does not come into contact with the flange 61 until the forming of the piercing hole 62 is started, the protrusion 41 that forms the separating member 40 has a component shape. A projection 43 provided for molding is also included. The former protrusion 42 is referred to as a “preceding protrusion 42” because the distal end portion 41 a is closer to the flange portion 61 than the distal end portion 22 a of the pierce punch 22. In the illustrated embodiment, the protrusion 41 that forms the separation member 40 includes both a preceding protrusion 42 and a protrusion 43 for forming a component shape. The dimension in which the leading protrusion 42 protrudes from the molding surface 23 of the wrist-like die 21 is the dimension g1 (g1> h), and the protrusion 43 for molding the part shape protrudes from the molding surface 23 of the wrist-like die 21. The dimension is dimension g2 (g2> h). A line connecting the leading protrusion 42 and the protrusion 43 with a tangent does not interfere with the tip 22 a of the pierce punch 22.

  The protrusion 41 constituting the separation member 40 may be provided intermittently in addition to the one that is continuous so as to surround the front end portion 22a of the piercing punch 22. Further, the amount by which the tip 41a of the protrusion 41 protrudes from the molding surface 23 of the wrist die 21 does not have to be the same size at all positions of the protrusion 41. Depending on the shape of the edge Wa of the workpiece W, the shape of the flange portion 61, the shape of the wrist-like die 21, the position of the pierce punch 22, and the like, the protruding amount of the protruding portion 41 may be different. Further, the protruding amount of a part of the protruding portion 41 may be smaller than the protruding amount h of the pierce punch 22. That is, the protrusion 41 as a whole is positioned so that the tip 22a of the piercing punch 22 does not contact the flange 61 until the movable die 20 moves relatively closer to the workpiece W and starts forming the piercing hole 62. It is enough if the function to hold is demonstrated.

  Referring to FIG. 5, punch 30 has a molding surface 31 having a shape that matches the outer shape of movable die 20. The molding surface 31 has a through hole 32 into which the tip 22a of the piercing punch 22 is fitted, a recess 33 into which the preceding projection 42 is fitted, and a recess 34 into which the projection 43 is fitted. The front end portion 22 a of the pierce punch 22 is fitted into the through hole 32, thereby forming the pierce hole 62 in the flange portion 61. When the protrusion 41 (the preceding protrusion 42 and the protrusion 43) is fitted into the recesses 33 and 34, the protrusion 41 restrains the workpiece W between itself and the punch 30. The protrusion 41 forms a convex portion 63 (see FIG. 3B) on the work W as the work W is restrained.

  3 (A) and 3 (B), the movable die 20 is moved by the dimensional relationship (g1> h, g2> h) between the tip 22a of the pierce punch 22 and the tip 41a of the protrusion 41. The tip 22a of the pierce punch 22 can be held at a position where it does not contact the flange 61 until it moves closer to the flange 61 of W and starts forming the pierce hole 62. Therefore, the flange portion 61 can be formed by the wrist-like die 21 in a state where the tip end portion 22a of the pierce punch 22 does not contact the workpiece W, and the workpiece W is not damaged by the contact with the piercing punch 22.

  Further, in a state where the tip 22a of the piercing punch 22 is not in contact with the workpiece W, the projection 41 starts forming the projection 63 on the workpiece W, and between the projections 63 until the molding of the projection 63 is completed. The formation of the pierce hole 62 is started. Accordingly, the molding of the piercing hole 62 can be completed almost simultaneously with the molding of the convex portion 63. In addition, when the piercing hole 62 is formed, the workpiece W is tensioned by the convex portion 63 that is formed along with the restraint by the protruding portion 41. For this reason, the piercing hole 62 can be easily drilled.

  Next, the operation of this embodiment will be described.

  6 is a cross-sectional view showing a state in which the workpiece W is pressed by the pad 50, FIG. 7A is a cross-sectional view showing a state in which molding of the flange portion 61 is started, and FIG. FIG. 8A is a cross-sectional view showing a state in which the protruding portion 41 starts forming the convex portion 63 on the workpiece W, FIG. 8A is a cross-sectional view showing a state in which forming of the pierce hole 62 is started, and FIG. It is sectional drawing which shows the state which completed the shaping | molding of the part 61, and shaping | molding of the pierce hole 62 in the same process.

  Referring to FIG. 5, workpiece W is put between movable die 20 and punch 30 in a state where movable die 20 and pad 50 are kept at the top dead center, which is the initial position, and a predetermined position on punch 30 is determined. Set to the correct position. The workpiece W has finished primary molding, and the edge Wa forming the flange portion 61 is gently curved.

  Referring to FIG. 6, pad 50 is lowered and workpiece W is held at a predetermined position by pressing workpiece W against punch 30.

  Referring to FIG. 7A, the movable die 20 is moved in the lateral direction on the right side in the drawing by a cam driver or other power, and the flange portion 61 is started to be molded. At this time, the tip 22 a of the pierce punch 22 is in a position where it does not come into contact with the flange 61 due to the protrusion 41 that forms the separation member 40.

  With reference to FIG. 7B, when the movable die 20 is further moved, the protrusion 41 restrains the workpiece W between the punch 30 and the tip portion 22a of the pierce punch 22 is not in contact with the workpiece W. Then, the convex part 63 is started to be formed on the workpiece W.

  With reference to FIG. 8A, when the movable die 20 is further moved closer to the flange portion 61 of the workpiece W, the tip end portion 22a of the pierce punch 22 comes into contact with the flange portion 61 and molding of the pierce hole 62 is started. Due to the dimensional relationship (g1> h, g2> h) between the tip 22a of the pierce punch 22 and the tip 41a of the protrusion 41, the movable die 20 moves closer to the flange 61 of the workpiece W and moves into the pierce hole 62. It is possible to hold the tip portion 22a of the pierce punch 22 in a position where it does not come into contact with the flange portion 61 until the molding is started. Therefore, the flange portion 61 can be formed by the wrist-like die 21 in a state where the tip end portion 22a of the pierce punch 22 does not contact the workpiece W, and the workpiece W is not damaged by the contact with the piercing punch 22.

  Further, since the piercing hole 62 is formed by the piercing punch 22 in a state where the protrusion 41 restrains the workpiece W between the punch 30 and the workpiece W is tensioned, the piercing hole 62 can be easily drilled.

  Referring to FIG. 8B, when the movable die 20 moves to the forward limit position, the formation of the flange portion 61 by the wrist-like die 21 and the formation of the pierce hole 62 in the flange portion 61 by the pierce punch 22 are completed. . The formation of the pierce hole 62 is completed almost simultaneously with the formation of the convex portion 63.

  Thus, at the initial stage of molding, the flange portion 61 can be molded by the wrist-like die 21 in a state where the tip portion 22a of the pierce punch 22 is not in contact with the workpiece W by the projection 41, and the piercing punch 22 No damage due to contact is made on the workpiece W. In the later stage of molding, the piercing hole 62 can be molded while the workpiece W is restrained by the protrusion 41. Therefore, the formation of the flange portion 61 and the formation of the pierce hole 62 in the formed flange portion 61 can be completed in one step without damaging the workpiece W. Compared to the case of forming over two steps, the die cost of the press die can be reduced, and the space can be saved. Further, in forming the flange portion 61 and the pierce hole 62 in the same process, it is only necessary to move the movable die 20, and the mold structure becomes simpler than the double-action structure, and the operation is improved. The time required for the switching work is also unnecessary.

  As described above, in the present embodiment, it is possible to perform the molding of the flange portion 61 and the molding of the pierce hole 62 in the same process while preventing the workpiece W from being damaged. The structure is simple and a series of processing can be performed quickly.

  The spacing member 40 is formed from a protrusion 41 provided on the wrist die 21, and the tip 41 a of the protrusion 41 is brought closer to the flange 61 than the tip 22 a of the pierce punch 22. The flange portion 61 can be formed by the wrist-like die 21 in a state where the front end portion 22a does not contact the workpiece W, and scratches due to contact with the pierce punch 22 can be prevented from being attached to the workpiece W.

  Since the protrusion 41 constituting the separation member 40 restrains the workpiece W between the punch 30 and the workpiece W, a tension is applied to the workpiece W and the piercing hole 62 can be easily drilled.

  In addition, although the front fender 60 as the panel component has been described as an example, the present invention is not limited to this case. The present invention can be widely applied to parts that need to be subjected to press working for bending the edge portion Wa of the panel-shaped workpiece W to form the flange portion 61 and forming the pierce hole 62 on the formed flange portion 61. it can.

It is sectional drawing which shows the principal part of the press work apparatus which concerns on this invention. It is sectional drawing which shows the 1st type | mold shown by FIG. FIG. 3A is a cross-sectional view showing a state when the flange portion is being formed, and FIG. 3B is a cross-sectional view showing a state when the pierce hole is being formed. FIG. 4A is a view showing a front fender as an example of a panel part formed by pressing, and FIG. 4B is a cross-sectional view taken along line 4B-4B in FIG. 4A. It is sectional drawing which shows the state which supplied the workpiece | work which primary molding was complete | finished to the press work apparatus. It is sectional drawing which shows the state which presses a workpiece | work with a pad. FIG. 7A is a cross-sectional view showing a state in which the forming of the flange portion is started, and FIG. 7B is a cross-sectional view showing a state in which the protruding portion forming the spacing member has started forming the convex portion on the workpiece. . FIG. 8A is a cross-sectional view showing a state in which the forming of the piercing hole is started, and FIG. 8B is a cross-sectional view showing a state in which the forming of the flange portion and the forming of the piercing hole are completed in the same process.

Explanation of symbols

10 Press processing equipment,
20 movable die (first mold),
21 Wrist-like die (die),
22 Piercing punch,
22a The tip of the piercing punch,
30 punches (second mold),
40 spacing member,
41 protrusions,
41a The tip of the protrusion,
42 Leading protrusion (protrusion),
43 Protrusions (protrusions) provided to mold the part shape,
50 pads,
60 Front fender,
61 flange,
62 Piercing holes,
63 convex part,
W Work,
Wa edge.

Claims (6)

A press working device for forming a flange portion by bending an edge of a panel-shaped workpiece and forming a pierce hole in the flange portion,
A first mold in which a pierce punch for forming the pierce hole is fixed to a die for forming the flange portion;
A second mold for forming the flange portion and the piercing hole for the workpiece with the first mold;
Position where the tip of the pierce punch is not in contact with the flange until the first die moves relative to the workpiece and starts forming the pierce hole. And a separation member for holding in the press.   2. The press working apparatus according to claim 1, wherein the spacing member is formed by a protrusion provided on the die, and a tip portion of the protrusion is closer to the flange portion than a tip portion of the pierce punch. .   The press working apparatus according to claim 2, wherein the protruding portion restrains the workpiece between the second die. A pressing method for forming a flange portion by bending an edge of a panel-shaped workpiece and forming a pierce hole in the flange portion,
A first die in which a piercing punch for forming the piercing hole is fixed to a die for forming the flange portion; and forming the flange portion with respect to the workpiece between the first die and A step of setting the workpiece between a second mold for forming the pierce hole;
The first mold moves relative to the workpiece to form the flange portion by the die, and until the formation of the pierce hole is started, the separation member provided in the first mold Holding the tip of the piercing punch in a position that does not contact the flange; and
A step of moving the first die relatively closer to the workpiece and forming the pierce hole in the flange portion by the pierce punch.   The press working according to claim 4, wherein the spacing member is formed by a protrusion provided on the die, and a tip end of the protrusion is closer to the flange than a tip end of the pierce punch. Method.   The press working method according to claim 5, wherein the piercing hole is formed by the piercing punch in a state in which the workpiece is restrained between the protrusion and the second die.

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