JP2004160509A - Work straightening die - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a technique by which a work straightening die is corrected inexpensively in a short time. <P>SOLUTION: Each of a second die 26 and a second punch 68 can be moved in a plane wherein a first die 42 and a first punch 64 cross each other in an approaching direction. On the way that the second die 26 and the second punch 68 approach each other, either one of the second die 26 and the second punch 68 which abuts first on a work whose one end side is restrained by the first die 42 and the first punch 64 moves in the plane and is positioned by using the work as a reference. Next, the other one of the second die 26 and the second punch 68 moves in the plane and is positioned by using one of the second die 26 and the second punch 68 positioned already as a reference, and under the condition that the other end side of the work is restrained by the second die 26 and the second punch 68, the whole of the second die 26 and the second punch 68 whose mutual positional relation is determined moves in the plane and is positioned by using either one of the first die 42 and the first punch 64 as a reference. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a mold for correcting the shape of a metal member.
[0002]
2. Description of the Related Art The shape of a metal member tends to be distorted when it is released from a mold or when heat treatment is performed. Thin aluminum die-cast members (for example, used for automobile front side members), which are often used for weight reduction, are particularly susceptible to distortion, and a technique for correcting the distortion is strongly desired.
A technique for correcting the shape of a metal member is described in, for example, “Patent Document 1”. In this technique, the shape of the metal member is corrected by pressing the metal member with a correction die including an upper die and a lower die.
[0003]
[Patent Document 1]
JP-A-2002-28726 (pages 1-4, FIG. 1)
[0004]
In the case of a metal member, when the metal member is taken out of the straightening mold, its shape changes due to the elasticity remaining in the metal member. For this reason, even if the correction space of the correction type has the normal shape of the metal member, the metal material cannot be corrected to the normal shape. After the metal member removed from the straightening mold is changed by elasticity, it must be straightened to have a regular shape.
An effective technique for determining the correction space shape in the correction mold in advance has not been developed, and at present, the correction space shape is corrected by repeating trial and error. That is, the work of correcting the metal member after making corrections such as "sharpening and overlaying" on the straightening mold is repeated, and the corrected spatial shape such that the metal member taken out of the straightening mold becomes a normal shape after being changed by elasticity. It will be corrected.
In the conventional correction mold described above, it is necessary to repeat a mold correction work such as “shaving and overlaying” and a trial correction work many times before correcting the shape to a satisfactory correction space shape. And costly.
[0005]
The present invention has been made to solve such a problem, and it is an object of the present invention to provide a technique that can correct a correction mold in a short time and at low cost.
[0006]
According to the first aspect of the present invention, a first die and a first punch, which restrain one end of a work by approaching each other, approach each other. Accordingly, a second die and a second punch for restraining the other end of the work are provided. Each of the second die and the second punch is movable in a plane intersecting in a direction in which the first die and the first punch approach. While the second die and the second punch approach each other, one of the second die and the second punch that first contacts the work whose one end is restrained by the first die and the first punch moves in the plane. The work is positioned with reference to the work. Then, the other of the second die and the second punch moves in the plane and is positioned with reference to one of the positioned second die and the second punch, and the other end of the workpiece is positioned by the second die and the second punch. In a state where the sides are constrained, the whole of the second die and the second punch whose mutual positional relationship is positioned moves in the plane and is positioned with reference to either the first die or the first punch.
[0007]
According to the above-described correction mold, one of the second die and the second punch moves and is positioned based on the work whose one end is restrained by the first die and the first punch. Next, the other of the second die and the second punch is positioned with reference to one of the moved second die and the second punch. As a result, the work is restrained by the second punch and the second die. At this time, since the second punch and the second die move on the basis of the work, even if the work shape before the correction is largely deviated from the normal shape, no large external force is applied to the work.
With the second die and the second punch constraining the other end of the work, the entire second die and the second punch move and are positioned with reference to either the first die or the first punch. At this time, the work is corrected. Since the work is straightened while being restrained by the second punch and the second die, there is no wrinkle or the like during the straightening.
According to this correction type, the correction space shape of the correction type can be changed by correcting the positional relationship between the second punch and the second die relative to any one of the first punch and the first die. To obtain a satisfactory correction space shape of the correction mold, it is only necessary to correct the positional relationship between the second punch and the second die with respect to either the first punch or the first die, and it is necessary to correct the correction front shape of the die. There is no.
[0008]
2. The work correction mold according to claim 1, wherein a tapered pilot pin and an engagement hole are provided between the second die and the second punch, and a lower plate whose positional relationship with the first punch in the plane is restricted. It is preferable that a tapered pilot pin and an engagement hole are provided between the second dies (claim 2).
With this configuration, the second die and the second punch are positioned by the pilot pin and the engagement hole provided between the second die and the second punch.
The positional relationship of the lower plate with respect to the first punch is restricted. For this reason, the whole of the second die and the second punch is positioned by the tapered pilot pin and the engagement hole provided between the lower plate and the second die.
[0009]
In the work correction mold according to claim 1 or 2, it is preferable that a cam punch that slides and approaches the first die when the first die and the first punch approach is provided (claim 3).
With this configuration, the work is further restrained by the cam punch approaching the first die.
[0010]
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A shape correcting apparatus 10 according to an embodiment of the present invention will be described with reference to the drawings.
As shown in FIG. 1, the shape correcting device 10 includes a lower mold 20 and an upper mold 60. The shape correcting device 10 is attached to a general-purpose press having an upper lifting mechanism 83 and a lower lifting mechanism 81. The upper and lower sides in FIG. 1 correspond to the upper and lower sides of the shape correction device 10. FIG. 1 shows that the upper die 60 is arranged at the raised position by the upper elevating mechanism 83, and the cam holder 24 and the second die 26 of the lower die 20 which are raised and lowered by the lower elevating mechanism 81 are mounted on the lower plate 22. This shows a state of being disposed at the lowered position (the cam holder 24, the second die 26, and the lower plate 22 will be described later).
The shape correction device 10 corrects a thin aluminum die-cast work 14 shown in FIG. The cross section of the work 14 is U-shaped and includes ribs 14a and 14b arranged at right angles to the longitudinal direction. Such a work 14 is often distorted when it is released from the casting mold or when heat treatment is performed.
[0011]
As shown in FIG. 1, the lower die 20 includes a lower plate 22, a cam holder 24 and a second die 26 mounted on the lower plate, a first die 42 fixed on the cam holder 24, and the like. Have been. The position of the lower plate 22 is fixed.
As shown in FIG. 3, the lower plate 22 is formed with twelve through holes 23 penetrating vertically. FIG. 4 is a cross-sectional view taken along the line IV-IV of FIG. 3 and shows a cross-sectional view rotated rightward by 90 degrees. As shown in FIGS. 3 and 4, two holders 28 are fixed on the lower plate 22, and two columnar cam drivers 29 are fixed on the holder 28. As shown in FIG. 4, an inclined surface 29 a is formed on a side surface of the cam driver 29.
[0012]
As shown in FIGS. 3 and 5, the pilot assembly 31 attached to the lower plate 22 includes a plate 32 and two pilot pins 33 fixed to the plate 32. Note that FIG. 5 shows a cross-sectional view rotated rightward by 90 degrees. The pilot pin 33 is formed in a column shape having a tapered portion 33a on the upper part. The plate 32 has twelve mounting holes 32a penetrating vertically.
The lower plate 22 has a recess 30 having a rectangular planar shape. The pilot assembly 31 is fixed to the lower plate 22 by inserting pins into a plurality of pin holes formed in the mounting hole 32a of the plate 32 and the bottom of the concave portion 30 (pins and pin holes are not shown). ). By selecting the mounting hole 32a for inserting the pin, the arrangement of the pilot assembly 31 with respect to the lower plate 22 can be adjusted.
[0013]
As shown in FIGS. 6 and 7, the cam holder 24 is formed with four through holes 36 having a substantially rectangular cross section penetrating vertically. On the cam holder 24, slides 37, 38, 39, 40 and a first die 42 are fixed. The first die 42 is formed in a shape along the lower surface side of the left half of the work 14 shown in FIG. The first die 42 has a slit 42a corresponding to the shape of the rib 14a of the workpiece 14.
FIG. 8 is a plan view showing a state in which the cam holder 24 is placed on the lower plate 22 and the cam holders 24 are further fitted with cam workers 44 and 46 and cam punches 47, 48, 49 and 50. FIG. 9 is a sectional view taken along line IX-IX of FIG. As shown in FIGS. 8 and 9, a cam driver 29 is inserted into the through hole 36 of the cam holder 24 (FIG. 9 shows a cross-sectional view rotated 90 degrees clockwise to the right). ). The cam worker 44 is mounted between the slide 38 and the slide 40. The cam worker 46 is mounted between the slide 37 and the slide 39.
[0014]
As shown in FIGS. 10 and 11, the cam worker 44 is formed with an inclined surface 44a and a mounting surface 44b. ing). An inclined surface 46a and a mounting surface 46b similar to those of the cam worker 44 are also formed on the cam worker 46 (not shown). As shown in FIG. 9, the inclined surface 29a of the cam driver 29 and the inclined surfaces 44a, 46a of the cam workers 44, 46 abut each other. The cam punches 47 and 48 are mounted on the mounting surface 44b of the cam worker 44, and the cam punches 49 and 50 are mounted on the mounting surface 46b of the cam worker 46. The cam worker 44, the cam punches 47 and 48, the cam worker 46, and the cam punches 49 and 50 are urged toward the side separated from the first die 42 by a spring (not shown).
[0015]
As shown in FIGS. 12, 13, and 14, the second die 26 has a base portion 26a and a die portion 26b. As shown in FIG. 13, engagement holes 26c, 26d, 26e, and 26f are formed in the base portion 26a so as to penetrate in the vertical direction. The die portion 26b is formed in a shape along the lower surface of the right half of the work 14 shown in FIG. Further, a slit 26s having a shape corresponding to the rib 14b of the work 14 is formed in the die portion 26b. The second die 26 is mounted on the lower plate 22 with the pilot pins 33 of the pilot assembly 31 inserted through the engagement holes 26c and 26d.
The positional relationship between the second die 26 with the pilot pin 33 inserted through the engagement holes 26c and 26d and the first die 42 of the cam holder 24 does not correspond to the regular shape of the work 14. The second die 26 in a state where the pilot pin 33 is inserted into the engagement holes 26c and 26d is located at a position shifted to a direction in which the work 14 is further corrected than the normal shape of the work 14 (hereinafter, referred to as a correction position). Be placed.
As shown in FIG. 1, a columnar cushion pin 15 that is raised and lowered by the lower lifting mechanism 81 is inserted into the through hole 23 of the lower plate 22. The cushion pin 15 is disposed below the cam holder 24 and the second die 26. Accordingly, as the cushion pin 15 moves up and down, the cam holder 24 and the second die 26 also move up and down.
[0016]
As shown in FIGS. 1 and 15, the upper die 60 includes an upper plate 62, a first punch 64, an upper holder 65, a second punch 68, and bear holders 66, 71, 72 and the like. The flat upper plate 62 is attached to a pressing machine (not shown). The first punch 64 is fixed to the upper plate 62. The punch portion 64a formed on the first punch 64 is formed in a shape along the upper surface side of the left half of the work 14 shown in FIG.
The upper holder 65 is fixed to the upper plate 62. The L-shaped bear holders 66, 71, 72 are fixed to the upper plate 62, and a rotatable ball 73 is mounted at the tip thereof. Although six bear holders are provided, the bear holders 66, 71, and 72 represent them in FIGS. In FIG. 1, the illustration of the bear holders 71 and 72 is omitted, and in FIG. 15, the illustration of the bear holder 66 is omitted.
[0017]
As shown in FIG. 15, the second punch 68 is formed with a flange 68c. Then, the bearer holders 66, 71, 72 suspend the flange 68 c via the ball 73, so that the second punch 68 is mounted on the upper plate 62. With such a configuration, the second punch 68 can move in the horizontal direction while the upper surface 68b and the lower surface 65a of the upper holder 65 slide. The punch portion 68a of the second punch 68 is formed in a shape along the upper surface of the right half of the work 14 shown in FIG. A cylindrical pilot pin 75 protruding downward corresponding to the positions of the engagement holes 26 e and 26 d of the second die 26 is attached to the second punch 68. A tapered portion 75a is provided on the distal end side of the pilot pin 75.
[0018]
The operation of the shape correcting device 10 will be described.
When correcting the shape of the work 14, as shown in FIG. 16, the cam pin 24 and the second die 26 are raised to the raised position by the cushion pin 15. The second die 26 and its engaging holes 26c and 26d come off from the pilot pin 33 fixed to the lower plate 22. Even if the engagement holes 26c and 26d come off the pilot pin 33, the second die 26 rises directly above. Therefore, the horizontal positional relationship between the second die 26 and the lower plate 22 that has risen to the ascending position is the same as when the second die 26 is placed on the lower plate 22. That is, the second die 26 that has been raised to the raised position is located at the correction position with respect to the lower plate 22.
[0019]
In a state where the cam holder 24 and the second die 26 are arranged at the raised position, the workpiece 14 is set on the die portions 26b of the first die 42 and the second die 26. At this time, the rib 14a of the work 14 is inserted into the slit 42a of the first die 42, and the rib 14b is inserted into the slit 26s of the second die 26. The work 14 is distorted into a shape different from the normal shape, and the second die 26 is disposed at the correction position as described above. Therefore, the set work 14 does not fit the first die 42 and the die part 26b.
[0020]
Subsequently, the upper elevating mechanism 83 operates to lower the upper die 60. First, an operation of restraining the work 14 will be described. FIG. 17 illustrates a state in which the cam holder 24 is disposed at the ascending position, and the work 14 is sandwiched between the first die 42 and the first punch 64 that has descended. As described above, the cam workers 44 and 46 and the cam punches 47 and 50 are urged in the direction away from the first die 42 by the spring. Accordingly, the cam workers 44 and 46 are guided by the inclined surface 29 a of the cam driver 29 and are arranged at positions away from the first die 42 together with the cam punches 47 and 50. Although not shown in FIG. 17, the cam punches 48 and 49 are also arranged at positions away from the first die 42.
When the first punch 64 presses the work 14, the cushion pin 15 loses the force, and the cam holder 24 descends. When the cam holder 24 is lowered, as shown in FIG. 18, the cam workers 44, 46 are guided by the inclined surface 29a of the cam driver 29 and move toward the first die 42, and the cam punches 47, 48, 49, 50 The work 14 is sandwiched and pressed between the first die 42 and the first die 42. Therefore, the work 14 is restrained.
[0021]
The operation of correcting the work 14 will be described. This operation is performed in parallel with the operation of restraining the work 14 described above.
FIG. 19 illustrates a state where the second punch 68 is being lowered. As described above, the work 14 before correction does not fit to the die portion 26b of the second die 26 (FIG. 19 illustrates a state where the work 14 does not fit to the die portion 26b and is biased to the right. ing). The second punch 68 and the second die 26 shown in FIG. 19 and FIG. 20 described later are illustrated in a cross section including the axes of the engagement holes 26 e and 26 f of the second die 26.
Even if the horizontal positional relationship between the second punch 68 and the second die 26 is misaligned, when the second punch 68 descends, the tapered portion 75a of the pilot pin 75 engages with the engagement holes 26e and 26f of the second die 26. Combine. When the second punch 68 is further lowered while the pilot pin 75 is engaged with the engagement holes 26e and 26f, the second punch 68 is guided by the engagement holes 26e and 26f to a position corresponding to the second die 26. Moving. Then, as shown in FIG. 20, the second punch 68 and the second die 26 sandwich the work 14.
[0022]
As described above, the raised second die 26 is located at the correction position. Therefore, while the second punch 68 and the second die 26 sandwich the work 14, the second die 26 is guided by the distorted work 14 and moves in the horizontal direction. FIG. 20 illustrates a state in which the second die 26 has been moved to the right more than that shown in FIG. 19 in this manner. When the second die 26 moves in the horizontal direction, the lower surface of the second die 26 and the upper surface of the cushion pin 15 slide.
[0023]
When the second punch 68 and the second die 26 further descend, the engagement holes 26c and 26d of the second die 26 engage with the tapered portion 33a of the pilot pin 33 as shown in FIG. The second punch 68 and the second die 26 of FIG. 21 and FIG. 22 described later are illustrated in a cross section including the axes of the engagement holes 26c and 26d of the second die 26. When the engagement holes 26c and 26d are engaged with the tapered portion 33a, the second punch 68 and the second die 26 are guided by the pilot pin 33, and as shown in FIG. And is placed on the lower plate 22. When the second punch 68 and the second die 26 sandwiching the work 14 move to the correction position, the distorted shape of the work 14 is corrected.
[0024]
The shape correcting apparatus 10 of the present embodiment can easily adjust the shape of the work 14 simply by adjusting the positional relationship between the pilot pin 33 fixed to the lower plate 22 and the engaging holes 26c and 26d of the second die 26. The amount of correction can be adjusted.
[0025]
As mentioned above, although the specific example of this invention was demonstrated in detail, these are only illustrations and do not limit a claim. The technology described in the claims includes various modifications and alterations of the specific examples illustrated above.
Further, the technical elements described in the present specification or the drawings exhibit technical usefulness alone or in various combinations, and are not limited to the combinations described in the claims at the time of filing. The technology illustrated in the present specification or the drawings achieves a plurality of objects at the same time, and has technical utility by achieving one of the objects.
Therefore, for example, it can be configured as described below.
[0026]
(1) What the shape correction device corrects is not limited to the horizontal direction. By adjusting the positional relationship between the second die and the first die, distortion in the height direction of the work and torsion distortion of the work can be corrected.
(2) Two or more sets of the second punch and the second die may be provided. With this configuration, the degree of freedom for correcting the work is increased.
[Brief description of the drawings]
FIG. 1 is a side view of a shape correction device according to an embodiment.
FIG. 2 is a perspective view of a work according to the embodiment.
FIG. 3 is a plan view of a lower plate according to the embodiment.
FIG. 4 is a sectional view taken along line IV-IV of FIG. 4;
FIG. 5 is a sectional view taken along line VV of FIG. 4;
FIG. 6 is a plan view of the cam holder according to the embodiment.
FIG. 7 is a view taken along line VII-VII of FIG. 6;
FIG. 8 is a plan view showing a state in which the cam holder and the like according to the embodiment are mounted on a lower plate.
FIG. 9 is a sectional view taken along line IX-IX of FIG. 8;
FIG. 10 is a plan view of the cam worker according to the embodiment.
FIG. 11 is a sectional view taken along line XI-XI in FIG. 10;
FIG. 12 is a side view of a second die according to the embodiment.
FIG. 13 is a plan view of a second die according to the embodiment.
FIG. 14 is a sectional view taken along line XIV-XIV of FIG. 12;
FIG. 15 is a sectional view taken along line XV-XV in FIG. 1;
FIG. 16 is a side view of the shape correcting device in a state where the cam holder and the second die according to the embodiment are arranged at the raised position.
FIG. 17 is a cross-sectional view illustrating a state in which the cam holder according to the embodiment is arranged at the ascending position, the first punch is lowered, and the work is sandwiched.
FIG. 18 is a cross-sectional view illustrating a state in which the cam holder according to the embodiment is disposed at the lowered position, and the first punch is lowered to restrain the work.
FIG. 19 is a cross-sectional view illustrating a state where the second die according to the embodiment is arranged at the ascending position and the second punch is descending.
FIG. 20 is a cross-sectional view of a state where the second die according to the embodiment is arranged at the ascending position, and the work is sandwiched between the second die and the second punch;
FIG. 21 is a cross-sectional view illustrating a state where the second die and the second punch according to the embodiment are both lowered while sandwiching the work.
FIG. 22 is a cross-sectional view illustrating a state where the second die and the second punch according to the embodiment are lowered and arranged at the correction position.
[Explanation of symbols]
10: Shape correction device 14: Work,
14a, 14b: rib 15: cushion pin 20: lower mold 22: lower plate 23: through hole 24: cam holder 26: second die, 26a: base portion, 26b: die portion,
26c, 26d, 26e, 26f: engagement hole 26s: slit 28: holder 29: cam driver, 29a: inclined surface 30: concave portion 31: pilot assembly 32: plate, 32a: mounting hole 33: pilot pin, 33a: taper portion 36: through holes 37, 38, 39, 40: slide 42: first die, 42a: slit 44: cam worker, 44a: inclined surface, 44b: mounting surface 46: cam worker, 46a: inclined surface, 46b: mounting Mounting surfaces 47, 48, 49, 50: cam punch 60: upper die 62: upper plate 64: first punch 65: upper holder, 65a: lower surface 66: bear holder 68: second punch, 68a: punch portion, 68b: upper surface, 68c: Flanges 71, 72: Bear holder 75: Pilot pin, 75b: Tapered portion 81: Lower lifting mechanism 83: Upper lifting Structure

Claims (3)

A first die and a first punch that restrain one end of the work by approaching each other;
A second die and a second punch for restraining the other end of the work by approaching each other;
Each of the second die and the second punch is movable in a plane intersecting in a direction in which the first die and the first punch approach,
While the second die and the second punch approach each other, one of the second die and the second punch, which first contacts the work whose one end is restrained by the first die and the first punch, moves in the plane. And the other of the second die and the second punch is moved in the plane to be positioned with reference to one of the positioned second die and the second punch. With the other end side of the work constrained by the second punch and the second punch, the whole of the second die and the second punch, whose relative positions are positioned, move in the plane, and either the first die or the first punch is moved. Work correction type characterized by positioning based on A tapered pilot pin and an engagement hole are provided between the second die and the second punch, and a tapered pilot pin is engaged between the lower plate and the second die, whose positional relationship with the first punch in the plane is restricted. The work correction type according to claim 1, wherein a mating hole is provided. The workpiece correction mold according to claim 1, further comprising a cam punch that slides when the first die and the first punch approach each other and approaches the first die.

Images