JP3199991B2 - Press molding die equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a press-molding die apparatus, and more particularly to a press-molding die apparatus suitable for bending a metal plate into polygons and press-forming it into an asymmetric box-shaped V-shaped cross section.

[0002]

2. Description of the Related Art Conventionally, in order to obtain a press-formed product 29 having an asymmetric box-shaped V-shaped cross section as shown in FIG. 7 by press-forming a metal plate, as shown in FIG.
Using a brake press to control the holding force
Work piece 29 between (A), (B) and (C) in this order between 61 and upper mold 60
Of the three bent portions 29a, 29b and 29c
Was press molded.

[0003] This is problematic in that it takes time and effort, is inferior in accuracy, and requires experience and intuition.

Therefore, as shown in FIG. 9 (A), after bending the work piece 29 between the lower die 63 and the upper die 64, the bent portions 29d and 29e are press-formed on both sides thereof. 9 (B)
As shown in FIG. 7, the upper mold 64 is replaced with the upper mold 60, and the workpiece 29 is again pressed between the upper mold 60 and the groove 63a of the lower mold 63, thereby bending between the bent portions 29d and 29e. A method of forming the part 29f has been proposed.

[0005] This method has two steps.
In order to maintain the accuracy of the intervals d, 29e, and 29f, a template must be used, and there is a problem that the time required to replace the upper mold 64 with the upper mold 60 increases. Then, in order to prevent springback of the molded product, it is necessary to perform press molding while suppressing the pressing force by using a brake press. Therefore, there is a problem that experience and intuition are required.

An object of the present invention is to provide a press-forming die apparatus capable of press-forming a plate-shaped workpiece into an asymmetric box-shaped V-shaped cross section by one step and by a so-called push-off operation. To be.

Another object is to form a plate-shaped workpiece into a highly accurate asymmetric box V without depending on experience or intuition.
To provide a press-molding die apparatus which is capable of press-molded into a shaped cross section.

Another object of the present invention is to provide a mold apparatus capable of easily removing springback of a molded product.

[0009]

DISCLOSURE OF THE INVENTION The present invention has been made to achieve the above object, and its gist is to provide a V-shaped projection protruding downward and asymmetrical corners on both sides thereof. A press-forming die apparatus for press-forming a plate-shaped workpiece between the upper press die and the lower die by press-moving the upper press die having up and down and press-forming into an asymmetric box-shaped V-shaped cross section. The lower mold has a main body having a concave portion that opens upward, and a die that is provided in the concave portion by a hydraulic cylinder.
Die cradle that can be moved up and down via cushion pins
Times with the V-shaped concave groove corresponding to the V-shaped protrusions of the upper pressing die on the upper surface is rotatably supported on an upper portion of the die receiving table
A press, comprising: a movable mold composed of a moving die , and a fixed mold fixed in the recess and opposed to the asymmetrical corner of the upper pressing die to limit the corresponding corner. It is in the molding die apparatus.

[0010]

[0011] It is a another feature is that the V-shaped concave groove the rotational die in the unloaded is provided with trunnion cylinder for directed to face upward.

Still another feature is that guide plates which are driven by a hydraulic cylinder and can protrude and retract into the recess are provided on both upper sides of the recess.

Still another feature is that a pusher is provided which pushes a flat plate-shaped workpiece placed on the lower die and abuts on a reference pin.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be specifically described with reference to FIGS. In FIG.
Reference numeral 0 denotes a press machine, on which a table 115 is mounted on a lower frame base 101 via wheels 118 so as to be movable in a direction shown by a white arrow, and a lower die 1 is fixed on the table 115. .

In a recess 119 formed in the center of the lower frame base 101, a plurality (ten in the figure) of die cushion cylinders 10 are arranged at regular intervals in a direction perpendicular to the plane of the drawing.
3 are vertically fixed, and the pistons 104 of the plurality of die cushion cylinders 103 extend and contract in synchronization.

A hydraulic cylinder 107 is fixed to a portal frame 106 fixed to the upper part of a plurality of columns 105, and the intermediate frame 109 is fixed to the column 10 by expansion and contraction of the hydraulic cylinder 107.
5 can be moved up and down.

The holder 110 fixed to the intermediate frame 109
A groove 111 is provided at the lower end of the holder 112. A protrusion 113 projecting upward from the upper pressing die 112 is inserted into the concave groove 111, and a bolt (not shown) is fastened.
It is detachably supported at 0.

As shown in FIG. 1, the upper pressing die 112 has an asymmetrical box-shaped V-shaped cross - section formed by a V-shaped convex portion 114 projecting downward, an obtuse angle portion 112a and an acute angle portion 112b formed asymmetrically on both sides thereof. I have. The V-shaped protrusion 114 is
It is more outwardly biased.

The lower mold 1 is, as shown in FIG.
A main body 2 fixed above, fixed dies 6 and 7 disposed in a recess 3 formed in the main body 2 and opening upward, an intermediate block 9, a die receiving base 13, a rotating die 18, a guide plate
28A, 28B, etc.

The intermediate block 9 is fastened to the main body 2 by bolts 8, and the fixed mold 6 is mounted on the intermediate block 9 and fastened to the intermediate block 9 by bolts 10 and fastened to the main body 2 by bolts 8. ing. The fixture 7 is fastened to the main body 2 by bolts 8.

The movable die 50 is constituted by the rotating die 18 and the die receiving table 13. The movable die 50 is vertically inserted into a vertically extending groove 11 formed adjacent to the fixed dies 6 and 7. It is arranged movably. The rotating die 18 is the die support 13
It is rotatably supported in an arc-shaped concave groove 12 formed on the upper surface of the optical disk.

A slightly larger V-shaped groove 20 having the same shape as the V-shaped convex portion 114 of the upper pressing die 112 is formed on the upper surface of the rotating die 18, and the arc-shaped groove of the die receiving table 13 is formed on the lower surface thereof. Groove 12
An arc-shaped convex portion 19 having the same size and shape as that of FIG.

A guide plate 28 is provided above the left side wall of the recess 3.
A is embedded, and its outer surface cooperates with the upper surface of the fixed mold 7 to limit a slightly large obtuse angle corner portion having the same shape as the obtuse angle portion 112a of the upper pressing die 112. As shown in FIG. 3, the guide plate 28A can move horizontally and advance into the recess 3 by extending the piston 31A of the hydraulic cylinder 30A.

A guide plate 28 is provided above the right side wall of the recess 3.
B is buried, and its outer surface cooperates with the upper surface of the fixed mold 6 to limit a slightly large acute angle corner having the same shape as the acute angle portion 112b of the upper pressing mold 112. As shown in FIG. 3, the guide plate 28A can move horizontally and advance into the recess 3 by extending the piston 31B of the hydraulic cylinder 30B.

A die cushion pin 14 is disposed in a hole 16 passing through the bottom of the recess 3 so as to be vertically movable. The die cushion pin 14 is formed by a flange 15 formed at the upper end thereof.
It is suspended. The upper surface of this flange 15 is opposed to the lower surface of the die receiving table 13, and the lower end of the die cushion pin 14 is
5 and the upper end of the piston 104 of the die cushion cylinder 103 through a through hole 117 formed in the die cushion cylinder 103. In addition, a scraper for preventing dust from being caught in the upper and lower ends of the hole 16 due to the vertical movement of the die cushion pin 14.
17 are arranged.

As shown in FIG. 3, a movable block 24 is provided in the recess 3, and the movable block 24 is always located between the plurality of intermediate blocks 9 as shown in FIG. As shown in FIG. 6, the pistons 26 of a plurality (three in the figure) of hydraulic cylinders 25 fixed to the right outer surface of the main body 2 are extended so as to be inserted into the lower space of the die receiving base 13. Has become. Note that the position of the movable block 24 can be confirmed by the sensor 27.

As shown in FIG. 4, a trunnion cylinder 21 is pivotally supported on both end surfaces of the die receiving base 13, and a threaded bearing 22 provided on a pillow ball end of the trunnion cylinder 21 pivots on the rotating die 18. Is being worn.

The turning die 18 to the pressing force, i.e., when the load is applied, but pillow ball end of the trunnion cylinder 21 is rotated die 18 by deflecting the spring 23 to rotate, the load is eliminated, the spring 23 rotating the die 18 but extends
It was allowed to return to its original position to direct the V-shaped groove 20 upwardly.

As shown in FIG . 1, a reference pin 35 is provided on a receiving base 33 fixed to the right side of the base 2a of the main body 2 and extending upward.
These reference pins 35 are raised by the extension of the piston 37 of the hydraulic cylinder 36 to occupy the illustrated position.

A pusher arm 42 is provided on the left outer side of the main body 2.
The base end of the arm is rotatably supported about an axis 41, and this arm
A hydraulic cylinder 44 is fixed to the distal end of 42. And a bracket fixed to the left side of the base 2a of the main body 2.
At 38, one end of a hydraulic cylinder 39 is pivotally supported via a shaft 40,
The upper end of the piston 43 of the hydraulic cylinder 39 is in contact with the pusher arm 42.

When the piston 43 of the hydraulic cylinder 39 is extended, the pusher arm 42 pivots clockwise about the axis 41 to occupy the position shown in the drawing. The pusher 46 mounted on the lower mold 1 pushes the plate-shaped workpiece 29 placed on the lower die 1 so that the reference surface at the other end abuts on the reference pin 35.

As shown in FIG. 6, two reference pins 35 are disposed at an interval, and a pusher arm 42, a hydraulic cylinder 44, and the like are disposed at an intermediate position therebetween.

FIG. 5 shows a hydraulic system diagram. When the solenoid valve A is excited to supply hydraulic oil from the hydraulic pressure source J to the hydraulic cylinder 116, the piston 120 is extended, whereby the table 115 moves on the lower frame base 101,
Stop in place outside of 105.

Next, after the plate-shaped workpiece 29 is placed on the lower mold 1 by a crane or the like, the solenoid valve B is excited to supply pressure oil to the hydraulic cylinder 36. Then
The piston 37 extends, and the reference pin 35 rises to occupy the position shown in FIG.

Then, the solenoid valve C is excited to activate the hydraulic cylinder.
When the piston 43 is extended by supplying pressure oil to 39, the piston 43 is pushed up and the pusher arm 42 rotates clockwise around the axis 41, and the hydraulic cylinder 44 is moved to the position shown in FIG. Occupy.

Then, when the solenoid valve D is excited to supply the hydraulic oil to the hydraulic cylinder 44 to extend the piston 45, the pusher 46 at the tip pushes the workpiece 29 to make the other end the reference. The workpiece 29 is brought into contact with the pin 35, whereby the workpiece 29 is positioned at a predetermined position.

Next, when the solenoid valve E is excited to supply pressure oil to each die cushion cylinder 103, the piston 10
4 extend and abut on the lower end of the die cushion pin 14, and the die receiving base 13 and the rotating die 18 rise through the die cushion pin 14 to occupy the position shown in FIG.

Therefore, the solenoid valve F is excited to operate the hydraulic cylinder.
When the piston 26 is extended by supplying pressure oil to 25, the movable block 24 moves forward and is inserted into the lower space of the die receiving base 13, and thus, the die receiving base 13 is supported on the movable block 24. Is done.

Next, when the piston 108 is extended by exciting the solenoid valve G to supply the pressure oil to the hydraulic cylinder 107, the intermediate frame 109 descends while being guided by the column 105, and the upper holder is accordingly moved. 110 and the upper pressing die 112 suspended by the lowering are lowered.

[0040] When the V-shaped protrusion 114 of the upper press die 112 comes in contact with the workpiece 29, the workpiece 29 is started bend, V-shaped concave groove that the lower surface is formed on the upper surface of the rotary die 18 20 , The rotating die 18 rotates while bending the spring 23 of the trunnion cylinder 21. Further the upper press metal plate 112 is lowered, it is bent to the workpiece 29 along these shapes is pinched between the V-shaped protrusions 114 and the V-shaped concave groove 20.

At this time, the lowering of the upper pressing mold 112 is stopped by returning the solenoid valve G to the neutral position, and then the movable block 24 is retracted by switching the solenoid valve F in the reverse manner to move the movable block 24 between the intermediate block 9. To be stored.

Then, simultaneously with lowering the upper pressing die 112, the solenoid valve E is switched to switch the die cushion cylinder 103
Drain the pressurized oil from inside, die cushion pin 14, die holder
13.When the rotating die 18 is lowered, the workpiece 29
The workpiece 29 is pressed into the concave portion 3 while being deformed and pressed into the concave portion 3, and the lower surface thereof is brought into contact with the fixed dies 6 and 7 and the guide plates 28 A and 28 B.
It is press-formed into an asymmetric box-shaped V-shaped cross - section having an asymmetrical convex portion and asymmetrical acute and obtuse portions on both sides thereof.

Next, the solenoid valve H is excited to release the hydraulic cylinder.
By supplying pressure oil to 30A, 30B, its piston
When 31A and 31B are extended, guide plates 28A and 28B
When the workpiece 29 having the asymmetrical box-shaped V-shaped cross section is pressed against the upper pressing mold 112 and this state is maintained for several seconds, the springback of the workpiece 29 is prevented. 29 press forming is completed.

Thereafter, the solenoid valve H is switched to move the guide plates 28A and 28B backward. Next, the solenoid valve G is switched to raise the upper pressing mold 112, and at the same time, the solenoid valve E is switched to raise the piston 104 of the die cushion cylinder 103 to lift the workpiece 29.

Thereafter, the solenoid valve F is switched to advance the guide block 24 and insert the guide block 24 into the lower space of the die receiving base 13. Thereafter, when the solenoid valve E is switched to lower the piston 104 of the die cushion cylinder 103, the die cushion pin 14 is also simultaneously lowered.

Next, the solenoid valve A is switched to switch the table 11
5 is pulled out of the column 105, and in this state, the formed workpiece 29 on the lower die 1 is carried out by a crane or the like.

When the formed work material 29 is transported using a manipulator device or the like, the table 115 does not have to be moved.

When the thickness of the workpiece 29 or the shape thereof is changed, the rotating die 18 and the fixed dies 6, 7 are replaced.

Further, as shown in FIG. 4, if a U-shaped shim 47 is interposed between the main body 2 and the guide plates 28A and 28B, workpieces 29 having different thicknesses can be processed. A molded article having a narrow asymmetric box-shaped V-shaped cross section can be obtained.

Further, if each member that comes into contact with the workpiece 29 is made of a casting material, it is possible to prevent the molded product from being stamped. Also, if the pushing force of the die cushion cylinder 103 is made sufficiently large, the movable block 24 and its driving mechanism can be omitted.

As shown in FIG. 1, when the left obtuse corner portion and the right acute angle corner portion of the lower mold 1 have the same height, the height of the left and right walls of the main body 2 is the same. By setting the height, the resistance at the time of entering the bending of the workpiece 29 becomes uniform, and the bending point of the workpiece 29 does not escape.
As shown in the figure, when the right acute corner is located below the left obtuse corner, the height of the right side wall is made lower than the height of the left side wall to enter the bending of the workpiece 29. The resistance at the time becomes uniform, and the bending point of the workpiece 29 does not escape.

[0052]

According to the present invention, there is provided an upper pressing die having a V-shaped projection projecting downward and asymmetrical corners on both sides thereof.
A body having a recess that opens upwards; and a body disposed in the recess.
Up and down movement via die cushion pin by hydraulic cylinder
Die stand to be squeezed and pivot on top of this die stand
V which is freely supported and corresponds to the V-shaped convex part of the upper push type on the upper surface
Ingredients and the movable mold consisting of rotating die, a lower die having a fixed die which limits the corners corresponding thereto opposite the asymmetric corners of the upper press die is fixed in a recess having a shape concave groove Therefore, the press forming is performed in one process using one mold device and by so-called push-cutting operation without relying on the experience and relying on experience in forming an asymmetrical box-shaped V-shaped cross section from a flat workpiece. can do.

Moreover, it corresponds to the V-shaped convex part of the upper push type on the upper surface.
A rotating die having a V-shaped concave groove is formed on the upper part of the die support.
, So that the V-shaped convex portion having an asymmetric box-shaped V-shaped cross section can be accurately formed.

[0054] In Re set the trunnion cylinder for directed so that the rotating dice the V-shaped concave grooves in its unloaded is directed upward, it is possible to rotate the rotating die without requiring any power At the same time, an excessive force can be prevented from acting on the rotating die, so that the damage can be prevented.

If a guide plate which can be driven into and out of the recess by being driven by the hydraulic cylinder is provided on both sides of the upper portion of the recess, springback of the molded product can be prevented.

By providing a pusher for pushing the flat plate-shaped workpiece placed on the lower die and abutting on the reference pin,
Positioning of the plate-shaped workpiece is facilitated, and work efficiency is improved.

[Brief description of the drawings]

FIG. 1 is a partial longitudinal sectional view of a main part showing one embodiment of the present invention.

FIG. 2 is a front view showing the entire configuration of the embodiment partially broken away.

FIG. 3 is a partial longitudinal sectional view showing a state where a movable mold in the embodiment is raised.

FIG. 4 is a side view showing the lower mold in the embodiment in a partially broken manner.

FIG. 5 is a hydraulic system diagram of the embodiment.

FIG. 6 is a schematic plan view of a lower die in the embodiment.

FIG. 7 is an external perspective view of a molded product.

FIGS. 8A, 8B, and 8C are cross-sectional views showing different steps of a conventional press forming method.

FIGS. 9A and 9B are cross-sectional views showing different steps of another conventional press forming method.

[Explanation of symbols]

1 lower mold 2 body 3 recesses 6,7 fixed mold 50 movable mold 9 intermediate block 11 groove 13 die cradle 14 die cushion pins 18 rotating die 20 V-shaped concave groove 21 trunnion cylinder 22 bearing 23 spring 24 movable block 25 Cylinder 28A, 28B Guide plate 29 Workpiece 30 Hydraulic cylinder 33 Cradle 35 Reference pin 36 Hydraulic cylinder 39 Hydraulic cylinder 42 Pusher arm 101 Lower frame base 115 Table 103 Die cushion cylinder 112 Upper pressing type 114 V-shaped convex 112a Obtuse angle 112b Sharp corner

──────────────────────────────────────────────────続 き Continuation of the front page (72) Inventor Seizaburo Morimoto 4-10-1, Yoga, Setagaya-ku, Tokyo New Caterpillar Mitsubishi Corporation (56) References JP-A-61-226129 (JP, A) JP-A 60-127033 (JP, A) (58) Fields investigated (Int. Cl. ⁷ , DB name) B21D 1/00-55/00

Claims (4)

(57) [Claims] 1. A flat-shaped workpiece is sandwiched between a V-shaped protrusion projecting downward and an upper press die having asymmetrical corners on both sides thereof by vertically moving the upper press die. In a press-molding die apparatus for press-forming into an asymmetrical box-shaped V-shaped section by pressing, the lower die has a main body having a concave portion opening upward, and a hydraulic cylinder disposed in the concave portion .
Die that can be moved up and down via die cushion pins
Scan cradle and a movable mold consisting of rotating die having a V-shaped concave groove corresponding to the V-shaped protrusions of the upper pressing die on <br/> surface is rotatably supported on an upper portion of the die receiving table A press-molding die apparatus, comprising: a fixing die fixed in the concave portion to face the asymmetrical corner of the upper pressing die and limit the corresponding corner. 2. When the rotating die is not loaded,
Shaped concave groove press molding die apparatus according to claim 1, characterized in that provided trunnion cylinder for directed to face upward. 3. A press-molding die apparatus according to claim 1 or 2, wherein it is driven by a hydraulic cylinder to the upper both sides of the recess, characterized in that disposed a guide plate which can be infested in the recess. 4. A press forming method according to claim 1 , further comprising a pusher for pushing a flat plate-shaped workpiece placed on said lower die and abutting against a reference pin. Mold equipment.