JPS6380928A - Method and device for drawing thin plate like work - Google Patents

Abstract

PURPOSE:To prevent the generation of a crack and rupture by holding the side end of a work with allowing its sliding at the time of drawing the crest and root parts. CONSTITUTION:When a work 3 is placed on a mobile die 9 and a lower holder 10 and a lift platform 18 is descended, a 1st mobile punch 16 pushes the work 3 down at the part corresponding to a root part 5 and a 2nd crest part 6 and relatively moves for an upper holder 15 as well. With further descent of the upper holder 15, the lower holder 10 is descended by holding the side end of the work 3 with allowing a sliding in the space with the upper holder 15 and the work 3 draws the part of the root part 5 with flowing a material into the inner part from the side end. The root part 5 and the 2nd crest part 6 of the work 3 are formed with their drawing by a lower die 8 and 1st mobile punch 16 with further descent of the upper die 2. When the upper holder 15 is descended up to the lower limit position, a 2nd mobile punch 17 pushes down the center part of the work 3, the apex part of a 1st crest part 4 is formed and the drawing of the work 3 is completed.

Description

Detailed Description of the Invention A0 Object of the Invention fl) Industrial Application Field The present invention is directed to drawing and forming a thin plate-like workpiece to form a first part in the center.
A method of drawing a thin plate-like workpiece for forming a peak and a second peak located outside the first peak with a valley interposed therebetween and having a smaller protuberance than the first peak. and regarding equipment.

(2) Conventional technology Conventionally, methods for drawing such workpieces include:
There are those that are drawn into a general shape in advance and then drawn into the final shape in the next step, and those that are divided into a plurality of molds and each mold is used to sequentially draw and form corresponding portions.

(3) Problems to be Solved by the Invention The conventional method described above requires many molding steps and requires the preparation of a plurality of molds, and if the mold is divided, the shape of the mold becomes complicated.

In order to eliminate this drawback, the prior art (US Patent No. 325231
No. 5), but since the drawing process is performed with the side edges of the workpiece clamped, the forming of the part corresponding to the second peak prevents the material from flowing inward from the side edges of the workpiece. However, due to the elongation rate of the material, the troughs may crack or break, making it difficult to form.

The present invention has been made in view of such circumstances, and -
It is an object of the present invention to provide a method and apparatus for drawing a thin plate-like workpiece, which can be drawn in a manner that does not cause cracks or breaks during the process.

B0 Structure of the Invention (1) Means for Solving the Problems According to the method of the present invention, the center and both side edges of a thin plate-shaped workpiece are supported in a floating manner while the workpiece is pushed into the part corresponding to the trough, and then the workpiece is prevented from slipping. After squeezing the workpiece at the portions corresponding to the second peaks and troughs while holding both side ends of the workpiece, the portions corresponding to the tops of the first peaks were pressed down.

Further, the device of the present invention has a fixed lower die; the lower die is arranged to be movable up and down in the center thereof, and is elastically biased upward so as to protrude upwardly than the lower die in a natural state. A movable die; disposed so as to be movable up and down outside the lower die in order to place both ends of the workpiece; a lower holder which is biased; an upper holder which is arranged to be movable up and down in order to cooperate with the lower holder to hold both ends of the workpiece while allowing the workpiece to slide; and a lower holder.

In order to draw the workpiece in cooperation with the die, it is supported by the upper holder and is movable vertically within a limited range. a first movable punch that is energized;
The first movable punch is arranged so as to be able to move vertically relative to each other within a limited range at the center, and the workpiece is processed in cooperation with the first movable punch at the part corresponding to the top of the first mountain part. A second movable punch is elastically biased downward.

(2) Effect In the method of the present invention, during drawing forming of the second peak and valley,
The side edges of the workpiece are held while allowing slippage, so
Inward flow of material is allowed to avoid cracking or breaking.

Furthermore, in the apparatus of the present invention, when the upper holder is lowered, both ends of the workpiece are held between the upper holder and the lower holder while allowing slippage, and the first movable punch corresponds to the troughs and second peaks of the workpiece. The part is pressed down elastically, and the valley part and the second peak part are drawn while allowing the material to flow in from the outer edge in cooperation with the lower die.Finally, the second movable punch and the movable die The top of the first peak is drawn.

Therefore, the method of the present invention can be appropriately carried out in one step by lowering the upper holder.

(3) Example Hereinafter, an example of the present invention will be explained with reference to the drawings. First, in FIG. 1, this drawing device is equipped with a lower mold 1 and an upper mold 2, and the As shown by the chain line, the thin metal workpiece 3 is located outside the first peak 4 with a first peak 4 in the center and a trough 5 interposed therebetween, and is further away from the first peak 4. It is drawn into a shape having a second peak portion 6 with a small amount of protrusion.

The lower mold l includes a fixed base 7, a lower die 8 fixed on the base 7, a movable die 9 disposed at the center of the lower die 8 so as to be movable up and down, and the lower die 8. The lower holder 10 is disposed so as to be movable upward and downward.

The upper surface of the lower die 8 is formed to correspond to the final drawing shape, and a cavity 11 is formed between the lower die 8 and the base 7.
is formed. Further, a through hole 12 extending vertically is formed in the central portion of the lower die 8, that is, a portion corresponding to the top of the first mountain portion 4, and a movable die 9 is disposed in this through hole 12 so as to be vertically movable. be done. An engaging flange 13 that can engage with the lower die 8 is provided at the lower end of the movable die 9 facing the cavity 11. When the engaging flange 13 is engaged with the lower die 8, the movable die 9
The upper surface projects higher than the upper surface of the lower die 8. Furthermore, an elastic support means 14 made of an elastic material such as rubber is interposed between the base 7 and the movable die 9 in the cavity 11, and the movable die 9 is resiliently biased upward. Ru.

The lower holder 10 is arranged vertically movably outside the lower die 8 to support both ends of the workpiece 3, and is supported by a support rod 22 extending vertically. This support rod 22 is vertically movable and passes through the base 7, and is resiliently biased upward by resilient biasing means (not shown). That is, lower holder 1
0 is resiliently biased upward, and the lower holder 10 at the upper limit position is on the same level as the movable die 9 at the upper limit position.

The upper die 2 includes an upper holder 15, a first movable punch 16 supported by the upper holder 15 so as to be relatively movable up and down, and a second movable punch 17 supported by the first movable punch 16 so as to be movable relative to each other up and down. Equipped with

The upper holder 15 cooperates with the lower holder 10 to slidably hold both ends of the workpiece 3, and is provided integrally with a lifting platform 18 connected to a lifting drive source (not shown).

The lower surface of the first movable punch 16 is formed in a shape corresponding to the upper surface of the lower die 8, and is supported by the upper holder 15 so as to be able to move vertically relative to each other within a limited range.

A spring 19 is interposed between the lifting table 18 and the first movable punch 16, and this spring 19 causes the first movable punch 1 to
6 is resiliently biased downward. As a result, the first movable punch 16 projects slightly below the upper punch 15 in a natural state where no external force is applied.

A through hole 2 extending vertically is provided in the center of the first movable punch 16.
0 is bored, and the second movable bunch 17 is inserted into this through hole 20 so as to be relatively movable up and down. Moreover, the relative movement range of the second movable bunch 17 is limited to a certain extent, and a spring 21 is provided between the lifting platform 18 and the second movable bunch 17 to bias the second movable bunch 17 downward. Intervened.

Next, to explain the operation of this embodiment, when drawing the workpiece 3, as shown in FIG. Place it on top. In other words! Soak 3
The center part is supported in a floating manner by a movable die 9, and both ends are supported in a floating manner by a lower holder 10.

Next, when the lifting platform 18 is lowered, the first movable punch 1
6 comes into contact with the workpiece 3 at portions corresponding to the second peaks 6 and troughs 5. Therefore, as the lifting platform 18 further descends, the first movable punch 16 pushes down the workpiece 3 at the portions corresponding to the troughs 5 and the second peaks 6, and pushes the workpiece 3 down into the upper holder 15 while contracting the spring 19. Move upward relative to the target. At this time, as shown in FIG. 2, both ends of the workpiece 3 are pulled inward and held between the lower holder 10 and the upper holder 15 while allowing slippage.

When the upper holder 15 further descends, as shown in FIG. 3, the lower holder IO descends holding the side edge of the workpiece 3 while allowing slippage between it and the upper holder 15, and the workpiece 3 is moved from the side edge. The valley portion 5 is narrowed down while the material is flowing inward. At this time, the second movable bunch 17 also
The central part of the workpiece 3 is in contact with the upper surface of the central part of the movable die 9.
and the second movable bunch 17.

As the upper mold 2 is further lowered, the lower die 8 and the first movable punch 16 move the valley portion 5 and the second peak portion 6 of the workpiece 3 into the fourth position.
As shown in the figure, drawing is carried out. At this time, since the material is allowed to flow inward from the side edges of the workpiece 3, drawing is carried out without causing any cracks or breaks.

Further, in this state, a slight upward relative movement of the first movable punch 16 with respect to the upper holder 15 is allowed, whereas upward relative movement of the second movable bunch 17 with respect to the first movable punch 16 is prevented. The second movable bunch 17 presses the movable die 9 slightly downward while compressing the elastic support means 14.

When the upper holder 15 descends to the lower limit position, as shown in FIG. Drawing forming is completed.

C29 Effects of the Invention As described above, according to the method of the present invention, the center and both side edges of a thin plate-shaped workpiece are supported in a floating manner while the workpiece is pushed in at the portions corresponding to the troughs, and then the both side edges of the workpiece are pushed in while allowing slippage. After squeezing the workpiece at the part corresponding to the second peak and trough while holding it, the part corresponding to the top of the first peak is pressed down, so the material can be squeezed while allowing the flow of the material. This makes it possible to draw and form a workpiece in one step without causing any cracks or breaks.

In addition, the device of the present invention is arranged such that it can move up and down in the center of the fixed lower die and the first lower die, and in a natural state, the movable device is resiliently biased upward so as to protrude above the lower die. The die is arranged so as to be movable up and down on the outside of the lower die in order to place both ends of the workpiece, and in its natural state is fired upward as much as possible to be at the same level as the movable die in its natural state. an energized lower holder; an upper holder that is movable up and down in order to cooperate with the lower holder to hold both ends of the workpiece while allowing the workpiece to slide; and an upper holder that cooperates with the lower die to hold the workpiece. The first member is movable vertically within a limited range for drawing processing, is supported by the upper holder, and is resiliently biased downward so as to protrude downward than the upper holder in its natural state. A movable punch; the first movable punch is disposed at the center to enable vertical relative movement within a limited range, and works in cooperation with the first movable punch at a portion corresponding to the top of the first mountain to move the workpiece. and a second movable punch that is resiliently biased downward to process the workpiece, so that both ends of the workpiece are held in a manner that allows the material to flow;
The workpiece can be drawn and formed by drawing the second peak and valley with the first movable punch and the lower die, and forming the top of the first peak with the second movable punch and the movable die. The method of the invention can be carried out optimally.

[Brief explanation of the drawing]

The drawings show one embodiment of the present invention, and FIG. 1 is a longitudinal sectional view of a drawing device, and FIGS. 2, 3, 4, and 5 are diagrams showing the forming process in sequence. FIG. 1 is a longitudinal cross-sectional view corresponding to FIG. 3... Work, 4... First peak, 5... Valley, 6
...Second mountain part, 8...Lower die, 9...Movable die,
10...Lower holder, 15...Upper holder, 16...
First movable punch, 17... second movable punch

Claims (2)

[Claims] (1) A thin plate-shaped workpiece is drawn and formed so that the first peak in the center and the trough are located outside of the first peak, and the amount of protrusion is smaller than the first peak. In a method of drawing a thin plate-like workpiece to form a second peak, the center and both side edges of the thin plate-like workpiece are supported in a floating manner while the workpiece is pushed into the part corresponding to the trough, and then, while allowing slippage, A thin plate characterized in that after holding both ends of the workpiece, the workpiece is squeezed at the portions corresponding to the second crests and troughs, and then the portion corresponding to the top of the first ridges is pressed down. A drawing method for shaped workpieces. (2) A thin plate-shaped workpiece is drawn and formed so that the first peak in the center and the valley are located outside of the first peak, and the amount of protrusion is smaller than the first peak. In a drawing forming device for a thin plate-like workpiece for forming a second mountain part, a fixed lower die; A movable die that is resiliently biased upward to protrude; a movable die that is movable up and down on the outside of the lower die to place both ends of the workpiece; A lower holder elastically biased upward to be at the same level as a certain movable die; arranged to be movable up and down in order to cooperate with the lower holder to hold both ends of the work while allowing the work to slip. The upper holder is supported by the upper holder and is supported by the upper holder so that it can move vertically within a limited range in order to draw the workpiece in cooperation with the lower die. a first movable punch that is resiliently biased downward; a first movable punch is disposed at the center of the first movable punch to enable vertical relative movement within a limited range; A drawing-forming device for a thin plate-like workpiece, comprising: a second movable punch elastically biased downward to process the workpiece in cooperation with the first movable punch at a corresponding portion.