JPH0565252B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an apparatus for drawing and forming thin plates of metal, synthetic resin, etc.

[Prior Art] Conventionally, body or roof frames for vehicles, ships, aircraft, etc., panels for furniture equipment, etc. are drawn between upper and lower molds of a press machine.
The required shape is given.

[Problems to be Solved by the Invention] However, in conventional drawing forming apparatuses, the peripheral edge of a thin plate is simply pressed and held between a die and a wrinkle holding plate, and a punch is pressed against the thin plate to apply drawing force. However, the thin plate cannot be drawn beyond a certain depth.

In addition, in conventional drawing forming equipment, the wrinkle pressing force applied to the peripheral edge of the thin plate is held constant by the frictional force between the wrinkle pressing plate and the thin plate, and the loss is large. In order to prevent wrinkles, a considerably large wrinkle pressing force is required.

Note that Japanese Patent Publication No. 19661/1983 describes a stretch draw forming machine equipped with a grip unit that clamps the peripheral edge of a material and applies a predetermined tension force from all sides.
However, this stretch draw forming simply pulls the straight edge of the material outward, excluding the corner edges, and even if the punch presses against the material, the center part of the material is drawn deep inward. It does not perform molding, but merely performs stretch molding. In addition, since stretch draw forming is not drawing forming in which the center part of the material goes inward, a wrinkle suppressing plate is used to prevent wrinkles from forming when the corner parts of the material are drawn inward during drawing forming. There is no place to provide a corner part of the material.

SUMMARY OF THE INVENTION An object of the present invention is to provide a drawing device that can impart novel drawing behavior to a thin plate and perform deep drawing to a certain depth or more on the thin plate.

Another object of the present invention is to perform drawing forming while reducing the wrinkle pressing force applied to the thin plate.

[Means for Solving the Problems] The present invention according to claim 1 includes a punch that clamps the peripheral edge of a region to be formed of a thin plate and presses against one surface of the region to be formed of the thin plate, and This is a thin plate drawing device in which the area facing the other surface of the forming area is an open area, and the apparatus includes a tension clamper that applies tension force to the linear peripheral edge of the thin plate, and a wrinkle suppressing force to the corner peripheral edge. The punch is pressed against the thin plate to which tension force and wrinkle suppressing force are applied by each of the clampers, thereby making it possible to perform drawing forming on the thin plate. The clamper applies a tension force to the thin plate during the drawing process, and is movable to follow the movement of the thin plate material toward the punch during the drawing process.

The present invention as set forth in claim 2 provides a drawing forming apparatus for a thin plate comprising upper and lower dies that clamp the peripheral edge of a region to be formed of a thin plate and press against upper and lower surfaces of the region to be formed of the thin plate. It has a tension clamper that applies tension force to the peripheral edge, and a wrinkle clamper that applies wrinkle pressing force to the corner peripheral edge. By pressing the punch, it is possible to perform drawing forming on the thin plate, and the tension clamper applies tension force to the thin plate during the drawing process, while also applying tension to the thin plate material toward the punch side during the drawing process. It is designed so that it can be moved by following the movement.

According to a third aspect of the present invention, in the present invention according to the first aspect, a sub-processing tool for processing a thin plate is further arranged in the open area.

According to a fourth aspect of the present invention, in the present invention according to any one of claims 1 to 3, the tension force applied by the tension clamper to the linear peripheral edge of the thin plate is applied to each side of the linear peripheral edge. The wrinkle pressing force applied by the wrinkle pressing clamper to the corner-shaped peripheral edge of the thin plate can be adjusted for each corner-shaped peripheral edge.

[Function] According to the present invention as described in claims 1 and 2, there are the following effects.

The thin plate is drawn with a punch while a tension clamper applies a tension force to the linear peripheral edge, and a wrinkle clamper applies a wrinkle pressing force to the corner-shaped peripheral edge.

At this time, (a) the tension clamper moves while applying a constant tensile force, following the movement of the thin sheet material toward the punch side (inward movement of the peripheral edge of the material) during drawing forming, Katatsu (b) The wrinkle suppressing clamper suppresses wrinkles at the corners of thin sheets that occur during drawing forming. That is, in the present invention,
By means of (a) and (b) above, it is possible to perform deeper drawing which is not seen in conventional thin plate drawing techniques.

In addition, when forming a thin plate with a punch, the tension force that holds the peripheral edge of the thin plate is used to directly pull and hold the thin plate with a clamper, and a certain degree of wrinkle prevention can be achieved with a relatively small tension force. . Therefore, it is possible to reduce the wrinkle pressing force that should be applied to the peripheral edge of the thin plate by the tension clamper and/or the wrinkle clamper.

According to the present invention according to claim 1, the following ~
It has the function and effect of

Since the area facing the other side of the forming area of the thin plate is an open area, the shape of the product during the forming process can be visually observed, and the forming conditions during the forming process can be effectively adjusted.

Since the area facing the other side of the forming area of the thin plate is also an open area, the installation space is small, such as the height dimension being small.

Mold cost is low because upper and lower molds are not required.

The area facing the other side of the forming area of the thin plate is an open area, and there is no operation of sandwiching the thin plate between the upper and lower dies, so safety is high.

According to the present invention as set forth in claim 3, there are the following effects.

Since the sub-processing tool can be arranged in the open area, it is possible to perform vibration forming, trim forming, piercing forming, etc. on the thin plate at the same time as drawing forming the thin plate.

According to the present invention as set forth in claim 4, there are the following effects.

(a) The tension force applied by the tension clamper to the linear periphery of the thin plate can be adjusted for each section within each side of the linear periphery, and the tension force applied to the linear periphery of the thin plate can be adjusted for each section within one long side of the product. Each part or 1
The optimal tension force can be applied to the shape of the product by changing the tension force application state for each part divided within two short sides or for each part divided within one short side. In addition, (b) the wrinkle pressing force that the wrinkle pressing clamper applies to the corner-shaped peripheral edge of the thin plate can be adjusted to each corner-shaped peripheral edge, and the state of applying the wrinkle pressing force can be changed for each corner of the product, etc., which improves the shape of the product. Can provide optimal wrinkle holding force. That is, in the present invention, the above
By using (a) and (b), it is possible to perform drawing forming that is optimal for the shape of the product, and it is possible to perform drawing forming that is deeper than that seen with conventional thin plate forming technology.

[Example] Fig. 1 is a schematic diagram showing a drawing device according to the first embodiment of the present invention, Fig. 2 is a schematic diagram showing an example of a direct acting tension clamper, and Fig. 3 is a schematic diagram showing an example of a direct acting tension clamper. FIG. 4 is a schematic diagram showing an example of a clamper; FIG. 4 is a schematic diagram showing an example of a lever-type clamper; FIG.
The figure is a schematic diagram showing an example of a lever-type wrinkle presser clamper, Figure 6 is a schematic diagram showing partial restraint molding, Figure 7 is a schematic diagram showing partial restriking molding, and Figure 8 is a schematic diagram showing vibration molding. , FIG. 9 is a schematic diagram showing trim, piercing, and flange forming, FIG. 10 is a schematic diagram showing bulge forming, and FIG. 11 is a schematic diagram showing a drawing device according to a second embodiment of the present invention. .

(First Embodiment) As shown in FIGS. 1A and 1B, the drawing device 10 includes six tension clampers 12 on each of the two long sides of the rectangular frame-shaped bed portion 11A of the frame 11. In addition, four tension clampers 12 are provided on each of the two short sides, and one wrinkle presser damper 13 is provided on each of the four corner portions. Further, a punch 14 is arranged in the central region of the bed portion 11A. A wrinkle presser plate lifting cylinder 15 is provided at a portion of the column portion 11B of the frame 11 corresponding to the center of each short side of the bed portion 11A.

Each tension clamper 12 has a clamping part 12A that clamps the peripheral edge of the forming area of the thin plate 1, and a cylinder 12B that can move the clamping part 12A in a direction toward and away from the thin plate 1. It is configured.
Thereby, each tension clamper 12 can clamp the peripheral edge of the region to be formed of the thin plate 1 and apply tension force F1 to the peripheral edge.

At this time, each tension clamper 12 applies tension forces A1, B1, C1 to the peripheral edge of the thin plate 1,
. . . J1 can be operated independently of each other in order to adjust each portion of the periphery.

Each wrinkle presser clamper 13 moves a frame-shaped upper wrinkle presser plate 17, which is suspended and supported by the above-mentioned lifting cylinder 15, to a frame-shaped lower wrinkle presser plate 16 fixed to the upper surface of the bed portion 11A. The wrinkle pressing force F2 can be applied to the peripheral edge of the thin plate 1 sandwiched between the upper and lower wrinkle pressing plates 16 and 17. Each wrinkle presser clamper 13 includes a swing lever 13A that presses down the upper wrinkle presser plate 17, and a wrinkle presser cylinder 13 that drives the swing lever 13A.
B.

At this time, each wrinkle presser clamper 13
Wrinkle pressing force F2-A,...F2-D on the peripheral edge of
are operated independently of each other to adjust each portion of the peripheral edge.

The punch 14 presses the thin plate 1 below the region to be formed with a punching force F3, and draws the thin plate 1 clamped by the tension clampers 12 and wrinkle clampers 13. The drawing device 10 has an open area 18 that faces the upper surface of the forming area of the thin plate 1.

Here, in the drawing device 10, each tension clamper 12 is used to hold the thin plate 1 during the drawing process.
When applying a tension force to the thin plate 1, it can move both outward and inward relative to the center of the material of the thin plate 1, as shown by the arrows pointing in both reciprocating directions in FIGS. 1A and 1B. As a result, each tension clamper 12
can move toward the center of the material following the movement of the material of the thin plate 1 toward the punch 14 (center of the material) during drawing forming.

In addition, specifically, the tension clamper 12 is as follows.
It is configured as shown in (1) to (3) below.

(1) The direct-acting clamper shown in Figure 2 has cylinder 12B.
The clamping part 12A that is moved by the movable block 101, the clamping cylinder 102 mounted on the movable block 101, and the movable block 1
The fixed claw 103 fixed to 01 and the clamping cylinder 1
02, and a movable claw 104 driven by the 02.

(2) The wedge type clamper shown in Figure 3 has cylinder 12.
The clamping part 12A, which is moved by the movable block 111, the clamping cylinder 112 mounted on the movable block 111, the fixed claw 113 fixed to the movable block 111, and the wedge 114 driven by the clamping cylinder 112. and a movable claw 115 that is pushed down by the wedge 114.
It is composed of.

(3) The lever type clamper in Fig. 4 has cylinder 12B.
The clamping part 12A that is moved by the movable block 121, the clamping cylinder 122 mounted on the movable block 121, and the movable block 1
A fixed claw 123 fixed to 21 and a clamping cylinder 1
22, and a movable claw 125 that is pushed down by the swing lever 124.

The tension force F1 in (1) to (3) above may be obtained not only by pneumatic pressure or hydraulic pressure, but also by an electric motor, electromagnetic force, or the like.

Further, the wrinkle presser clamper 13 may have a configuration as shown in FIG. 5. The wrinkle presser clamper 13 in FIG. 5 includes a cylinder 131 and a movable block 13 moved by the cylinder 131.
2, a swinging lever 133 provided on the movable block 132, and a wrinkle presser cylinder 13 mounted on the movable block 132 and driving the swinging lever 133.
4, and is configured to have a swing lever 133 to lower the upper wrinkle presser plate 17. This fifth
According to the wrinkle pressing clamper 13 shown in the figure, it is possible to apply a strong wrinkle pressing force F2 to the inner side of the peripheral edge of the thin plate 1, and in FIG.
By setting, the pressing force F1 of the cylinder 134 is
A larger wrinkle pressing force F2 can be obtained.

(Sub-processing tools) The following sub-processing tools (1) to (5) are arranged in the open area 18 of each drawing device 10.

(1) Partial constraint molding (see Figure 6 A and B).

Partial restraint forming tool 1 provided in open area 18
51 restrains a part of the back surface of the thin plate 1 to be drawn by the punch 14. 151A is urethane or the like.

(2) Partial restriking molding (see Figure 7).

A local mold 152 provided in the open area 18 partially restrikes the back surface of the thin plate 1 to be drawn with the punch 14.

(3) Vibration molding (see Figure 8).

By robotically controlling the vibration molding tool 153 provided in the open area 18,
Vibration forming is performed on the back surface of the thin plate 1 which is drawn with a punch 14.

(4) Trim, piercing, and flanging (see Figure 9).

Trim forming tool 15 provided in open area 18
4. Using the piercing/flange forming tool 155, trim the peripheral edge of the thin plate 1 drawn by the punch 14, and simultaneously perform piercing/flange forming on the center of the thin plate 1.

(5) Bulge forming (see Figure 10).

By providing the fluid pressure passage 156 in the punch 14 and arranging the split die 157 in the open area 18, the thin plate 1 drawn by the punch 14 can be
Mold into basil.

Next, the operation of the above embodiment will be explained.

The thin plate 1 is pressed with the punch 14 while the tension clamper 12 applies a tension force to the linear peripheral edge, and the wrinkle clamper 13 applies a wrinkle pressing force to the corner peripheral edge.
At this time, (a) the tension clamper 12 applies a constant tensile force while the thin sheet material moves toward the punch 14 (inward movement of the periphery of the material) during drawing. (b) The wrinkle suppressing clamper 13 suppresses the occurrence of wrinkles at the corner portions of the thin plate that occur during drawing forming. That is, in the present invention, due to the above (a) and (b), it is possible to perform deeper drawing which is not seen in conventional thin plate drawing techniques.

Furthermore, when forming the thin plate 1 with the punch 14, the tension force that holds the peripheral edge of the thin plate 1 is to directly pull and hold the thin plate 1 with the tension clamper 12, and the tension force is relatively small. A certain degree of wrinkle prevention can be achieved.
Therefore, the wrinkle pressing force that should be applied to the peripheral edge of the thin plate 1 by the tension clamper 12 and/or the wrinkle pressing clamper 13 can be reduced.

Since the area facing the other surface of the forming area of the thin plate 1 is the open area 18, the shape of the product during the forming process can be visually observed, and the forming conditions can be effectively adjusted during the forming process.

Since the area facing the other surface of the forming area of the thin plate 1 is the open area 18, the installation space is small, such as the height dimension being small.

Mold costs are low because upper and lower molds are not required.

The area facing the other surface of the forming area of the thin plate 1 is an open area 18, and there is no operation of sandwiching the thin plate 1 between the upper and lower dies, so safety is high.

Since the sub-processing tool can be placed in the open area 18, the thin plate 1 can be drawn and formed at the same time.
For vibration molding, trim molding,
Earring molding etc. can be performed.

(a) The tension force applied by the tension clamper 11 to the linear periphery of the thin plate 1 can be adjusted for each section within each side of the linear periphery;
The optimum tension force can be applied to the shape of the product, such as by changing the tension force application state for each part divided within one long side of the product or for each part divided within one short side of the product. Also,
(b) The wrinkle pressing force that the wrinkle pressing clamper 13 applies to the corner-shaped peripheral edge of the thin plate 1 can be adjusted for each corner-shaped peripheral edge, and the state of applying the wrinkle pressing force can be changed for each corner of the product. It is possible to apply the optimum wrinkle holding force to the shape. That is, in the present invention, according to the above (a) and (b), it is possible to perform drawing forming that is optimal for the shape of the product, and to perform drawing forming that is deeper than that seen in conventional thin plate forming techniques.

(Second Embodiment) As shown in FIGS. 11A and 11B, the drawing device 40 includes a punch 44 on the inner slide 43 of the inner ram 42 provided at the upper center of the frame 41, and a punch 44 on the inner slide 43 of the inner ram 42 provided at the upper center of the frame 41 A lower mold 46 is provided on the provided bolster 45.

The drawing device 40 includes a corner wrinkle pressing plate 49 on the outer slide 48 of the outer ram 47 provided at each of the four upper corners of the frame 41. The corner wrinkle pressing plate 49 can apply pressure to the thin plate 1 by pressing the peripheral edge corner of the region to be formed between it and the upper surface of the lower mold 46, thereby applying a wrinkle pressing force F2 to the thin plate 1.

Furthermore, the drawing device 40 includes tension clampers 5 at each of the four straight portions on the outer periphery of the lower die 46.
It is equipped with 0. The tension clamper 50 has a clamping part 50 that clamps the peripheral edge of the forming area of the thin plate 1.
A and a cylinder 50B that can move the clamping part 50A toward and away from the thin plate 1. Thereby, each tension clamper 50 can clamp the peripheral straight portion of the region to be formed of the thin plate 1, and can apply the tension F1 to the peripheral portion.

Therefore, in the case of the drawing device 40, the corner wrinkle presser plate 49 and the tension clamper 50 are
A punch 44 and a lower mold 4 are attached to the thin plate 1 which is clamped at
6, the thin plate 1 is subjected to drawing forming.

In the drawing device 40, each corner wrinkle pressing plate 49 can be operated independently from each other so as to adjust the wrinkle pressing force F2 for each peripheral corner portion of the thin plate 1 for each peripheral corner portion.

Further, in the drawing device 40, each tension clamper 50 can operate independently of each other so as to adjust the tension force F1 for each peripheral straight portion of the thin plate 1 for each peripheral straight portion.

In this drawing forming apparatus 40, as in the drawing forming apparatus 10 described above, each tension clamper 50 applies a tension force to the thin plate 1 at the center of the material of the thin plate 1 during drawing. Can move both outward and inward. As a result, each tension clamper 50 is arranged so that the material of the thin plate 1 is on the side of the punch 44 (the center side of the material) during drawing.
You can follow the movement to the center of the material.

[Effects of the Invention] As described above, according to the present invention, it is possible to obtain a drawing device that can impart novel drawing behavior to a thin plate and perform deep drawing to a certain depth or more on the thin plate. can.

Further, according to the present invention, deeper deep drawing can be performed by reducing the wrinkle pressing force applied to the thin plate.

[Brief explanation of drawings]

Fig. 1 is a schematic diagram showing a drawing device according to the first embodiment of the present invention, Fig. 2 is a schematic diagram showing an example of a direct acting tension clamper, and Fig. 3 is a schematic diagram showing an example of a wedge type tension clamper. FIG. 4 is a schematic diagram showing an example of a lever-type tension clamper, FIG. 5 is a schematic diagram showing an example of a lever-type wrinkle clamper, FIG. 6 is a schematic diagram showing partial restraint forming, The figure is a schematic diagram showing partial restriking molding, FIG. 8 is a schematic diagram showing vibration molding, and FIG. 9 is a schematic diagram showing trim, piercing, and flange molding.
FIG. 10 is a schematic diagram showing bulge forming, and FIG. 11 is a schematic diagram showing a drawing device according to a second embodiment of the present invention. 10...Drawing device, 12...Tension clamper, 13...Wrinkle clamper, 14...Punch, 18...Open area, 40...Drawing device, 44...Punch, 46...Lower mold, 49...
Wrinkle holding plate, 50...Tension clamper.

Claims (1)

[Scope of Claims] 1. A punch that clamps the peripheral edge of the region to be formed of the thin plate and presses against one surface of the region to be formed of the thin plate, and a region facing the other surface of the region to be formed of the thin plate. An apparatus for drawing and forming a thin plate to form an open area, which includes a tension clamper that applies tension force to the linear peripheral edge of the thin plate, and a wrinkle clamper that applies wrinkle suppressing force to the corner peripheral edge, and each of the above By press-contacting the punch to a thin plate to which a tension force and a wrinkle pressing force are applied by a clamper, it is possible to perform drawing forming on the thin plate, and the tension clamper is used during drawing forming.
A drawing-forming device for a thin plate, which is movable to follow the movement of the thin plate material toward the punch side during the drawing process while applying a tension force to the thin plate. 2. In a thin plate drawing machine equipped with upper and lower dies that clamp the peripheral edge of the forming area of the thin plate and press against the upper and lower surfaces of the forming area of the thin plate, a tensioning force is applied to the linear peripheral edge of the thin plate. It has a wrinkle clamper and a wrinkle clamper that applies wrinkle pressing force to the corner peripheral edge, and the punch is pressed against the thin plate to which tension force and wrinkle pressing force are applied by each of the clampers. It is possible to carry out drawing forming, and the tension clamper is used during drawing forming.
A drawing-forming device for a thin plate, characterized in that it can move following the movement of the thin plate material toward the punch side during the drawing process while applying a tension force to the thin plate. 3. The thin plate drawing forming apparatus according to claim 1, wherein a sub-processing tool for the thin plate is arranged in the open area. 4. The tension force that the tension clamper applies to the linear peripheral edge of the thin plate can be adjusted for each section within each side of the linear peripheral edge, and the wrinkle presser clamper applies the tension force to the corner-shaped peripheral edge of the thin plate. 4. The thin plate drawing apparatus according to claim 1, wherein the wrinkle pressing force can be adjusted for each corner-shaped peripheral edge.