JP2596437B2 - Edge bending machine - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an edge bending apparatus capable of bending an edge portion of a metal plate that has been bent in advance into a larger folded shape.

Prior art The edge of a metal plate is bent in advance at a substantially right angle (not necessarily at a right angle), and the edge is further bent,
An edge bending apparatus (commonly called a hemming press apparatus) that finally bends in a folded shape to give a rounded edge is known. Such edge bending is performed on, for example, a hood, a trunk lid, and a door outer panel of an automobile. As a conventional edge bending apparatus, an apparatus for temporarily bending an edge portion of a metal plate that has been bent in advance using a punch positioned diagonally above the bent portion, and then performing a main bending using a punch positioned immediately above (for example, JP-A-56-74325) is known.

In the microfilm described in Japanese Utility Model Application No. 56-168883 (Japanese Utility Model Application No. 58-76327), the work is sandwiched between the upper and lower molds, and the bent edge of the work protruding by the upper and lower molds. By rotating the wing type 90 °,
After bending at a right angle and raising the upper die by a predetermined stroke, the workpiece is retracted to a position where the bent edge hits the tip of the acute-angle bending claw that has swung downward from the upper die, and then the upper die is again moved. Lower it, bend it at an acute angle with the bent edge between the acute angle bending claw and the recess of the upper mold, raise the upper mold again, remove the acute angle bending claw from the bending edge of the work, Thereafter, the work is moved in a direction away from the wing mold, and then the upper mold is lowered to perform goby folding.

However, in the apparatus described in JP-A-56-74325, a metal plate to be processed is simply placed on a lower die and bent by an upper punch. Because of this, the adhesion of the metal plate to the lower die is not good, the metal plate is likely to be misaligned during temporary bending, and the mechanical properties of the metal plate that differs for each production unit as a rolled material If it fluctuates, there is a disadvantage that good bending accuracy cannot be obtained due to a change in bending shape and dimensions.

Further, in the microfilm described in Japanese Utility Model Application No. 56-168883, it is necessary to reciprocate the upper die up and down three times, operate the wing type separately, and move the work twice. Because, operation becomes complicated,
There is a drawback that productivity is low and edge bending other than goby folding cannot be performed.

Means for Solving the Problems and Effects The present invention solves such a drawback, and the edge of a metal plate placed on a lower die is bent in advance, and the edge is An edge bending apparatus of a type in which hemming is performed by a bending punch provided in a lower die, wherein the lower die has an upper surface supporting a main wall of a metal plate and a bent wall previously bent from the main wall. A die having a vertical surface in contact with the die, a sliding guide table, a pre-bending cam and an edge bending punch, and an edge bending base frame supported by the sliding guide table and reciprocating in a horizontal direction capable of moving toward and away from the die. The upper die separated upward from the lower die is a pad support having a bend driving body having a cam roller abutting on a preliminary cam of the bend base frame, and a pad yoke integrally provided with a pad. A base frame, wherein the upper mold rest is mounted on the die. A pointed end that is applied to the lengthwise intermediate portion of the bent wall from the back side of the metal plate, and a pressing surface that presses another metal plate addressed to the main wall when the pointed end is applied, and The bent punch is configured to bend the bent wall at an acute angle along a bent edge defined by the tip of the abutment, and to incline and mutually press the tip half of the bent wall against the main wall side. And two pressing surfaces.

Since the present invention is configured as described above, the main wall of the metal plate is placed on the upper surface of the die, and the bent wall of the metal plate is in contact with the vertical surface of the die, Lower the mold,
Abutting the tip of the abutment against the middle space in the length direction of the bent wall, and pressing another metal plate addressed to the main wall with the abutment with the pressing surface of the abutment, The metal plate and another metal plate are integrally fixed on the die.

Next, when the upper die is further lowered, the pre-bending cam of the edge bending base frame is pressed by the lowering of the cam roller of the upper die, and the edge bending base frame is moved in the horizontal direction. The bent wall of the metal plate on the die is bent correctly along the tip of the pad by the edge bending punch.

When the lowering of the upper mold is further continued, the edge bending base frame is moved in the horizontal reverse direction in which the edge bending base frame returns to the initial position by the preliminary bending cam, and the edge bending punch is inclined toward the bent edge of the metal plate. The bent wall of the metal plate is bent at an acute angle by two downwardly inclined pressing surfaces of the edge bending punch, and the front half of the bent wall is formed of the metal plate. To bend the metal plate to the required triangular cross-sectional shape.

As described above, in the present invention, the upper mold is moved up and down once.
A bending step of bending the bent wall with respect to the main wall of the metal plate, and a bending step of bending the bent wall further at an acute angle and bending the tip half of the bent wall so as to be in contact with the main wall. Sequentially, the productivity can be greatly improved.

Further, in the present invention, the metal plate can be fixed firmly to the main wall of the metal plate and the required edge bending can be performed by the backing plate. Therefore, the edge bending of the product subjected to the edge bending is performed. Processing accuracy can be significantly increased.

Further, in the present invention, the edge bending thickness can be arbitrarily set in accordance with a change in the thickness of the metal plate and another metal plate by changing the size and shape of the metal plate.

Embodiment An embodiment of the present invention shown in FIGS. 1 to 4 will be described below.

FIG. 1 shows a main part of the edge bending apparatus 10. As shown in FIG. The edge bending apparatus 10 includes an upper die 12 and a lower die 64, and a die 64 of the lower die 64.
The metal plate (outer plate 108) placed on the top 68 can be bent (hemmed) at a pre-bent edge (bent wall 112).

The upper die 12 has an upper die main body 14 as a base frame, and includes an edge bending drive 16, a contact return drive 22, a edge bending punch driver 24, and a contact holder presser 26 that project downward from the upper die main body 14. A plurality of compression coil springs 32 and 34 for urging the support base frame 36 downward, and the upper mold body 14 and the support plate. It is interposed between the support base frames 36. The backing support frame 36 is provided integrally with a stopper column 38 and a projection 42 projecting downward,
A contact yoke 46 is supported by the support 2 via a support shaft 44 so as to be swingable. The hitting yoke 46 is provided integrally with a hitting 48 extending downward in a direction perpendicular to the plane of the drawing, and a hitting press drive unit 26 having a hitting press cam 28 formed at the lower end thereof. A pair of engaging cam rollers 54,5
6, a support shaft 58 attached to the end of the backing support base frame 36 on the opposite side of the cam rollers 54 and 56 and the backing support base frame.
A coil sleeve 62 is bridged between the projecting piece 40 and the 36, and a cam roller 60 is supported on a support shaft 58. When the upper mold 12 is lowered to a certain height position, the contact metal yoke 46 including the coil spring 62 is brought into contact with the lower mold 64 to cause the compression coil springs 32 and 34 to move.
Relatively against the resilient force of the upper die body 14, the cam roller 60 is pushed by the lower end of the abutment return driving body 22, and the abutment yoke 46 swings around the support shaft 44 as a fulcrum. As a result, the cam roller 54 and the cam roller 56 are in an inclined posture in which they are lifted.

The lower mold 64 has a die 68 and a stopper pillar 72 (the upper end of which is in contact with the lower end of the stopper pillar 38).
66 and an edge bending base frame 78 that reciprocates in a horizontal direction along a sliding guide base 76 formed on the top surface of the lower die body 66 as a main member, and a lower end portion of the edge bending base frame 78. A compression coil spring 106 is interposed between the edge bending base frame 78 and the lower die main body 66 so as to be fitted on the spring shaft 80 projecting from the bottom. The compression coil spring 106 biases the edge bending base frame 78 in a direction away from the die 68. Edge bending frame 78
Is a pre-bending cam 82 (having an upper inclined surface 84 and a lower inclined surface 86) which engages with a pre-bending cam roller 18 attached to the lower end of the edge bending driver 16; Cam follower that comes into sliding contact with the main bending cam 20 in the inclined posture attached to
88 at the top thereof and the pre-bending cams 82,
The cam follower 88 has a punch holding member 98 that carries an edge bending punch 100 at the top on the other side. Punch holding member
98 is supported by a collar 90 passing through a vertical hole of the edge bending base frame 78, is urged upward by a compression coil spring 92 for punching back, and is a sliding shaft for vertical movement of a punch penetrating the collar 90 slidably. The upper limit when the punch-back compression coil spring 92 pushes up the die 68 is
Is defined by the engagement relationship between the vertical hole peripheral opening and the flange 96. Punch holding member 98 and punch holding member
The edge bending punch 100 held by 98 is a member elongated in a direction perpendicular to the paper surface, and the lower surface thereof is continuous with the first pressing surface 102 corresponding to the upper surface 70 of the die 68 and the first pressing surface 102. And an inclined second pressing surface 104.

The operation of the edge bending apparatus 10 having such a structure is as follows.

First stage: the upper die 12 is at the upper limit position separated from the lower die 64, the outer plate 108 is placed on the upper surface 70 of the die 68, and the upper die 12 includes a main wall 110 and a pre-bent bent wall 112. Bent wall of plate 108
112 is along the vertical surface 74 of the die 68. The outer plate 108 is placed on the die 68 such that its outer surface is in contact with the die 68, and the inner plate 114 is moved along the inner surface (or the back surface) of the edge bending punch 100.
Is attached. The contact metal yoke 46 of the upper mold 12 is in a horizontal posture, and the edge bending base frame 78 of the lower mold 64 is a compression coil spring.
It is biased by 106 and is at the leftmost position shown in FIG. In addition, the edge bending punch 100 and the punch holding member 98 that carries the punch are a compression coil spring for punch return.
It is biased at 92 and is in the upper limit position (FIG. 1). Second stage: When the upper mold 12 is lowered, the lower end of the stopper post 38 integral with the backing support base frame 36 contacts the stopper post 72 integral with the lower mold body 66 of the lower mold 64 and the backing support base frame At the same time as the descent of the 36, the pressing surface 52 of the abutment 48 is applied to the inner plate 114, and the tip 50 of the abutment 48 is applied to the middle portion of the bent wall 112 in the back surface length direction. When the upper die 12 continues to descend even after the preliminary bending cam roller 18 comes into contact with the upper inclined surface 84 of the preliminary bending cam 82 belonging to the edge bending base frame 78, the edge bending base frame 78 is moved rightward by the preliminary bending cam roller 18. The edge bending punch 100 held by the punch holding member 98 abuts on the bent wall 112 at the upper limit position, and the bent wall 112 is correctly bent along the bending curve defined by the tip 50 of the backing 48. It is folded (Fig. 2). During this time, the pressing force of the contact plate 48 against the outer plate 108 and the inner plate 114 is controlled by the resilient force of the compression coil springs 34 and 32, and the contact plate press cam 28 which is the lower end of the contact plate driving unit 26.
It is given by the engagement relationship between the part and the cam rollers 54, 56. The lower portion of the presser foot presser 28 is continuously moved down while the bent wall 112 is bent, and the lower end presser press cam 28 is moved by the cam rollers 54 and 5.
6 and at the same time, the lower end of the contact return drive body 22 pushes the cam roller 60 attached to the contact yoke 46, and the support yoke 46 tilts and swings, and the pad 48 separates from the outer plate 108 and the inner plate 114 and escapes obliquely upward. After this, the edge bending punch 100 moves in the horizontal direction due to the contact relationship between the pre-bending cam roller 18 of the edge bending drive body 16 that continues to descend and the upper inclined surface 84 of the pre-bending cam 82, and folds along the bending curve. The curved wall 112 is further bent greatly (FIG. 3).

Third stage: When the edge bending punch 100 moves most in the direction of the die 68, the lower end of the edge bending punch driving body 24 comes into contact with the upper surface of the punch holding member 98, and resists the elastic force of the punch return compression coil spring 92. Punch holding member 98 and edge bending punch 10
0, and at the same time, the preliminary bending cam roller 18 comes off the upper inclined surface 84 and contacts the lower inclined surface 86, and the edge bending driving body 16
Cam follower for the main bending cam 20 and the edge bending base frame 78
The edge contacting base frame 78, the punch holding member 98, and the edge bending punch 100 start returning to the initial position direction due to the pressing contact relationship with 88 and the elastic force of the compression coil spring 106. as a result,
The edge bending punch 100 descends diagonally, and the upper surface 70 of the die 68
Then, the bent wall 112 is bent in such a manner as to approach the vertical surface 74. At the completion of the folding, the bent wall 112 has the edge bending punch 100
Along the first pressing surface 102 and the second pressing surface 104, the front edge side half of the bent wall 112 is pressed against the inner plate 114, and the remaining half of the bent wall 112 defines a triangular prism-shaped small space. (FIG. 4).

: Fourth stage: The upper die body 14 starts to move upward, and the punch holding member 98 and the edge bending punch 100 move the compression coil spring 92 for returning the punch.
And the compression coil spring 106 pushes the edge bending base frame 78 to retract the punch holding member 98 and the edge bending punch 100. The cam rollers 54 and 56 are engaged with the lower end contact pressing cam 28 of the body 26, and the restored contact 48 presses the bent wall 112 to reshape the outer plate 108. An edge bending base frame that rises away from the plate 108 and the inner plate 114 and carries the punch holding member 98 and the edge bending punch 100.
78 returns to the initial position. The reshaping of the outer plate 108 by the backing plate 48 does not necessarily have to be performed, and a shape in which the upper side of the backing press cam 28 protrudes in the direction of arrow A as compared to the lower side is adopted. Thus, the cam roller 56 of the contact yoke 46 swinging in the return direction can be engaged with the upper side of the contact pressing cam 28 so that the contact yoke 46 does not return to the horizontal position. However, when the contact metal yoke 46, which is initially in the horizontal position, is pushed and tilted and rocked by the contact metal return driver 22, the contact metal support base frame 36 carrying the contact metal yoke 46 also moves slightly in the horizontal direction. As a result, the cam roller 56 can easily get over the protruding portion of the contact pressing cam 28.

In addition, it is possible to omit the main bending cam 20 and the cam follower 88. In this case, the movement of the edge bending base frame 78 in the direction away from the die 68 is given by the elastic force of the compression coil spring 106.

The features obtained by this embodiment are as follows.

The bent shape of the lid having the thickness of the outer plate 108 is achieved by providing the upper mold 12 with a contact metal 48 that can move forward and backward in accordance with the movement of the edge bending punch 100, and furthermore, the first pressing surface 102 and the second pressing surface 104. By using the edge bending punch 100 having the above, molding can be performed without increasing the number of steps. Moreover, the tip of the padding 48
Edge bending punch 100 along the fold curve defined by 50
When the folding wall 112 is bent, the outer plate 108 and the inner plate 114 are pressed and held by the die 68 by the backing plate 48. The curved wall 112 is always bent exactly along the fold curve defined by the point 50 of the pad 48.

By selecting the shape of the contact metal 48, the bending thickness of the outer plate 108 (the length (H) of the bent wall 112) can be arbitrarily set.

By using the backing plate 48, the bent wall 112 can be correctly bent along the bending curve defined by the tip 50 of the backing plate 48 regardless of the presence or absence of the inner plate 114. It is not necessary to perform such a troublesome operation as setting the inner plate 114 after bending the inner plate 114 to some extent, and it is possible to reduce the number of steps and improve productivity.

[Brief description of the drawings]

FIG. 1 is a partially cutaway explanatory view showing an initial state of an edge bending apparatus according to an embodiment of the present invention, and FIGS. 2 to 4 each show bending of a metal plate by the edge bending apparatus. It is a figure showing a process. 10 …… Edge bending machine, 12 …… Upper mold, 14 …… Upper mold body,
16 ... Bending drive, 18 ... Pre-bending cam roller, 20 ...
… Main bending cam, 22… Private return drive, 24… Edge bending punch driver, 26… Private presser drive, 28… Private press cam, 30… Hanging bolt, 32… Compression coil spring, 34 Compression coil spring, 36 Support plate support frame, 38
… Stopper pillar, 40… Protruding piece, 42… Protruding piece, 44… Support shaft, 46… Backing yoke, 48… Backing plate, 50…
52 ... Pressing surface, 54,56 ... Cam roller, 58 ... Support shaft, 60
…… Cam roller, 62… Coil spring, 64 …… Lower type, 66…
… Lower body, 68… Die, 70… Upper surface, 72… Stopper column, 74… Vertical surface, 76… Sliding guide table, 78… Edge bending base frame, 80… Spring shaft, 82 …… Preliminary bending cam, 84 …… Upward inclined surface, 86 …… Low inclined surface, 88 …… Cam follower, 90 …… Color, 92 …… Punch return compression coil spring, 94 …… Punch up / down sliding body, 96 …… Tsubame, 98 …… Punch holding member, 10
0: Edge bending punch, 102: First pressing surface, 104: Second pressing surface, 106: Compression coil spring, 108: Outer plate, 110:
… Main wall, 112 …… Bent wall, 114 …… Inner plate.

Claims (1)

(57) [Claims] An edge bending process in which an edge portion of a metal plate placed on a lower die is bent in advance, and the edge portion is hemmed by a bending punch provided in the lower die. An apparatus, wherein the lower die has a die having an upper surface supporting a main wall of a metal plate and a vertical surface contacting a bent wall preliminarily bent from the main wall, a sliding guide table, a pre-bending cam and An edge bending base frame having an edge bending punch supported by the slide guide table and reciprocating in a horizontal direction reciprocally movable toward and away from the die; An edge bending drive having a cam roller abutting on a preliminary cam of a bending base frame, and a metal support base frame having a metal yoke integrally provided with a metal plate, the metal plate of the upper die being provided on the die. A point attached to the middle part of the bent wall from the back side of the placed metal plate, A pressing surface for pressing another metal plate addressed to the main wall at the time of the pointed abutment, and the edge bending punch is configured to bend along a bent edge defined by the apex of the abutment. An edge bending apparatus comprising: a wall that is bent at an acute angle; and two pressing surfaces that are inclined and continuous with each other and that press the front end half of the bent wall toward the main wall.