JPH0761506B2 - Method and apparatus for drawing thin plate-like work - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION A. Object of the Invention (1) Field of Industrial Application The present invention is a first part of a center part formed by drawing a thin plate-shaped work.
A method for drawing a thin plate-like work for forming a mountain portion and a second mountain portion which is located below the first mountain portion with a valley portion interposed therebetween and has a smaller amount of rise than the first mountain portion. And equipment.

(2) Conventional Technology Conventionally, as a method for forming a workpiece by drawing,
There are a method in which a rough shape is drawn in advance and then a final shape is drawn in the next step, and a method in which a mold is divided into a plurality of parts and corresponding parts are sequentially drawn in each mold.

(3) Problems to be Solved by the Invention In the above-mentioned conventional method, the number of molding steps is large and it is necessary to prepare a plurality of molds, and in the case where the molds are divided, the mold shape becomes complicated.

There is a prior art (U.S. Pat. No. 3,252,315) in which, in order to eliminate such a drawback, the drawing is performed in one step by an integral mold, but since the drawing is performed while the side end of the work is clamped. The material corresponding to the second crest is prevented from flowing inward from the side edge of the work, and the valley is cracked or broken due to the elongation ratio of the material, making molding difficult. Becomes

The present invention has been made in view of such circumstances, and an object of the present invention is to provide a method and apparatus for drawing a thin plate-like work capable of being drawn in a single step without causing cracks or breaks. And

B. Configuration of the Invention (1) Means for Solving the Problems According to the method of the present invention, the work is pushed in at the portions corresponding to the valleys while the center and both ends of the thin plate-like work are floatingly supported, and then slips. While allowing both sides of the work to be held, the work was squeezed at the portions corresponding to the second crests and the troughs, and then the portion corresponding to the top of the first crest was pressed.

Further, the device of the present invention is provided with a fixed lower die; vertically movable at the central portion of the lower die, and in a natural state, is elastically urged upward so as to project upward from the lower die. Movable die: It is arranged so that it can move up and down under the lower die to place both ends of the work, and in the natural state, it blasts upward to the same level as the movable die in the natural state. A biased lower holder; an upper holder that is arranged to be movable up and down so as to hold both side edges of the work in cooperation with the lower holder while allowing the work to slide; and work in cooperation with the lower die. It is relatively movable up and down within a limited range for drawing, is supported by the upper holder, and in a natural state, is elastically biased downward so as to project downward from the upper holder. Movable punch; limited at the center of the first movable punch It is arranged so as to be able to move up and down relative to each other in a vertical range, and is elastically urged downward in order to work the workpiece in cooperation with the first movable punch at the portion corresponding to the top of the first mountain portion. A second movable punch.

(2) Action In the method of the present invention, when the second peak portion and the valley portion are draw-formed,
Since the side edge of the work is held while allowing sliding,
The material is allowed to flow inward and cracks and fractures can be avoided.

Further, in the device of the present invention, both ends of the work are held between the upper holder and the lower holder while allowing the slide of the work due to the lowering of the upper holder, and the first movable punch corresponds to the valley and the second crest of the work. The part is elastically pushed down, and the valley and the second crest part are formed by drawing in cooperation with the lower die while allowing the material to flow from the outer end, and finally by 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 performed in one step by lowering the upper holder.

(3) Example Hereinafter, one example of the present invention will be described with reference to the drawings. First, in FIG.
And the upper die 2, and the metal thin plate-like work 3 that has been blanked in advance is, as shown by a chain line,
It has the 1st mountain part 4 of a central part, and the 2nd mountain part 6 which is located outside the 1st mountain part 4 via the valley part 5, and has a smaller amount of protrusion than the 1st mountain part 4. It is drawn into a shape.

The lower die 1 includes a fixed base 7, a lower die 8 fixed on the base 7, a movable die 9 arranged at the center of the lower die 8 so as to be vertically movable, and a lower die 8. The lower holder (10) is arranged so as to be able to move up and down.

The upper surface of the lower die 8 is formed in a shape corresponding to the final drawn shape, and a cavity 11 is formed between the lower die 8 and the base 7. In addition, the central portion of the lower die 8, that is, the first
A through hole 12 extending vertically is provided in a portion corresponding to the top of the mountain portion 4.
The movable die 9 is arranged in the through hole 12 so as to be vertically movable. At the lower end of the movable die 9 facing the cavity 11, an engaging collar 13 that can engage with the lower die 8 is provided.
The upper surface of the movable die 9 projects above the upper surface of the lower die 8 with the engaging collar 13 engaged with the lower die 8. Also the cavity 11
Elastic support means 14 made of an elastic material such as rubber is interposed between the base 7 and the movable die 9 therein, and the movable die 9 is elastically urged upward.

The lower holder 10 supports the lower die 8 to support both ends of the work 3.
A support bar that is vertically movably arranged underneath and extends vertically
Supported by 22. The support rod 22 is vertically movable and penetrates the base 7, and is elastically urged upward by elastic urging means (not shown). That is, the lower holder 10 is elastically urged upward, and the lower holder at the upper limit position is
10 is at 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 vertically movable relative to each other, and a first movable punch.
The second movable punch 17 is supported on the upper and lower parts 16 so as to be vertically movable relative to each other.

The upper holder 15 cooperates with the lower holder 10 to slidably hold both side ends of the work 3, and is integrally provided on a lift table 18 connected to a lift 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 vertically movable within a limited range.

A spring 19 is interposed between the lift 18 and the first movable punch 16, and the spring 19 urges the first movable punch 16 to elastically urge downward. As a result, the first movable punch 16 projects slightly below the upper punch 15 in a natural state where no external force acts.

A vertically extending through hole 20 is formed in the central portion of the first movable punch 16, and a second movable punch 17 is inserted into the through hole 20 so as to be vertically movable relative to each other. Moreover, the second movable punch 17 has a fixed relative movement range,
A spring 21 that elastically urges the second movable punch 17 downward is interposed between the lift 18 and the second movable punch 17.

Next, the operation of this embodiment will be described. In drawing the work 3, as shown in FIG. 1, the work 3 is moved to the movable die 9 and the lower holder 10 with the upper die 2 and the lower die 1 separated from each other. Place on top. That is, the central portion of the work 3 is floatingly supported by the movable die 9, and the both ends are lower holders 10.
Float supported by.

Then, when the elevator 18 is lowered, the first movable punch 16
However, at the portion corresponding to the second mountain portion 6 and the valley portion 5, the work 3
Abut. For this reason, when the lift table 18 is further lowered, the first movable punch 16 presses the work 3 at a portion corresponding to the valley portion 5 and the second crest portion 2, and the spring 19 is shortened to the upper holder 15. It moves relative to the upper direction.
At this time, as shown in FIG. 2, both ends of the work 3 are drawn inward, and the both ends are allowed to slide and the lower holder is allowed.
It is held between 10 and the upper holder 15.

When the upper holder 15 is further lowered, as shown in FIG.
The lower holder 10 holds the side end of the work 3 while allowing it to slide with the upper holder 15 and descends. The work 3 is squeezed in the valley portion 5 while allowing the material to flow inward from the side end. To go. At this time, the second movable punch 17 also contacts the upper surface of the central portion of the work 3, and the central portion of the work 3 is sandwiched between the movable die 9 and the second movable punch 17.

As the upper die 2 is further lowered, the valley portion 5 and the second crest portion 6 of the work 3 are draw-formed by the lower die 8 and the first movable punch 16 as shown in FIG. Since the material is allowed to flow inward from the side edge of the, the drawing is performed without cracking or breaking. Further, in this state, a slight upward movement of the first movable punch 16 with respect to the upper holder 15 is permitted, whereas an upward relative movement of the second movable punch 17 with respect to the first movable punch 16 is prevented. The second movable punch 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. 5, the second movable punch 17 pushes down the central portion of the work 3 to form the top of the first mountain portion 4, whereby the work 3
Draw forming is completed.

C. Effects of the Invention As described above, according to the present invention, the work is pushed in at the portions corresponding to the valleys while floatingly supporting the center and both ends of the thin plate-like work, and then both ends of the work are allowed while allowing slippage. Since the work is squeezed at the portions corresponding to the second crests and valleys while holding, the portion corresponding to the top of the first crests is press-formed, so squeezing while allowing the material flow. Therefore, the work can be formed by drawing in a single process without cracking or breaking.

Further, the device of the present invention is provided with a fixed lower die; vertically movable at the central portion of the lower die, and in a natural state, is elastically urged upward so as to project upward from the lower die. Movable die; arranged so that both ends of the work can be moved up and down outside the lower die, and in a natural state, the movable die is moved upward to reach the same level as the movable die in the natural state. A lower holder which is urged and biased; an upper holder which is arranged to be movable up and down so as to hold both side edges of the work in cooperation with the lower holder while allowing the work to slide; and a work in cooperation with the lower die The upper holder is supported so that it can move up and down relatively within a limited range in order to draw, and in a natural state, it projects downward from the upper holder and is elastically urged downward. 1 movable punch; limited at the center of the 1st movable punch It is arranged so as to be able to move up and down relative to each other in a vertical range, and is elastically urged downward to work the workpiece in cooperation with the first movable punch at the portion corresponding to the top of the first mountain portion. A second movable punch, which holds both side edges of the work so that a material flow is allowed,
The first movable punch and the lower die can squeeze the second peak portion and the valley portion, and the second movable punch and the movable die can shape the top portion of the first ridge portion to form a workpiece. The inventive method can be optimally implemented.

[Brief description of drawings]

The drawings show one embodiment of the present invention. FIG. 1 is a longitudinal sectional view of a drawing apparatus, and FIGS. 2, 3, 4, and 5 are views for sequentially showing a forming process. It is a longitudinal cross-sectional view corresponding to FIG. 3 ... Work, 4 ... 1st mountain part, 5 ... Valley part, 6 ... 2nd mountain part, 8 ... Lower die, 9 ... Movable die, 10 ... Lower holder, 15 ... Upper holder , 16 ... 1st movable punch, 17 ... 2nd movable punch

Claims (2)

[Claims] 1. A thin plate-shaped work is formed by drawing so that it is located outside the first crest portion with a first crest portion at the center and a trough portion, and the amount of rise is lower than that of the first crest portion. In a drawing method of a thin plate-like work for forming a small second mountain portion, while pushing and supporting the central part and both side ends of the thin plate-like work, the work is pushed in at a portion corresponding to a valley and then slipped. While allowing both sides of the work while allowing it, the work is squeezed at the parts corresponding to the second peaks and valleys, and then the part corresponding to the top of the first peak is pressed down. Forming method for thin plate-shaped workpiece. 2. A thin plate-shaped work is formed by drawing so that it is located outside the first crest portion with a first crest portion at the center and a trough portion, and the amount of rise is lower than that of the first crest portion. In a drawing method of a thin plate-like work for forming a small second mountain portion, a fixed lower die; and a lower die which is arranged so as to be movable up and down in a central portion of the lower die and which is naturally lower than the lower die. And a movable die that is elastically urged upward so as to project upward; and is arranged so that it can move up and down outside the lower die to place both ends of the work, and in a natural state it is natural Lower holder that is elastically urged upward to the same level as the movable die in a stable state; allows the workpiece to slide and can move up and down to hold both side edges of the workpiece in cooperation with the lower holder An upper holder provided; a limited range for drawing a work in cooperation with a lower die A first movable punch that is supported by the upper holder by being relatively movable in the vertical direction and is elastically urged downward so as to project downward from the upper holder in a natural state; It is arranged to allow relative movement in the vertical direction within a limited range in the central part of the, and the part corresponding to the top part of the first mountain part works downward with the first movable punch in cooperation with the first movable punch. And a second movable punch which is elastically urged.