JP2977973B2 - Multiple ironing forming machine - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an ironing machine for obtaining a container or a molded product having a bottom such as a body of a two-piece can.

[0002]

2. Description of the Related Art Conventionally, this type of molded product is prepared by first forming an intermediate product having a concave cross-sectional shape by drawing, and then passing it through an ironing die (ironing die) with a punch to perform ironing. The wall thickness is reduced and formed to the desired depth. An apparatus for performing such ironing is disclosed in JP-B-50-39516, JP-A-60-184429 and U.S. Pat. No. 3,44.
No. 6,167. Tokiko Sho 50-3
The ironing molding machine described in Japanese Patent Application Laid-Open No. 9516 and Japanese Patent Application Laid-Open No. Sho 60-184429 is of a so-called horizontal shaft type, in which a punch, which is moved back and forth by a driving means such as a crank, has a horizontal axis. In front of the punch, a redrawing die and a plurality of ironing dies having gradually decreasing inner diameters are arranged on the same axis, and the formed product is extracted from the punch at a position forward of the ironing die at the most advanced position. A stripper is arranged.
According to this ironing machine, an intermediate product having a concave cross-sectional shape obtained by drawing is placed in front of the punch at the retracted position,
If the punch is advanced in this state, the intermediate product is first pushed into the redrawing die, then into the ironing die by the punch, and the molded product that has been formed through the redrawing die and the plurality of ironing dies is completed. When the punch retreats, it is pulled out of the punch by the stripper, falls to a predetermined location, and is carried out.

Further, the apparatus described in US Pat. No. 3,446,167 holds an ironing die and a bottom molding tool dormer at a plurality of positions on the outer peripheral portion of a turret, and uses these ironing dies. A punch that moves up and down with respect to the dormer is arranged to rotate with the turret, and while the intermediate product supplied on the ironing die is rotated by the rotation of the turret, the punch descends and ironing and dome forming are performed. Is carried out, and the molded product after molding is taken out at the discharge position.

[0004]

In the above-described ironing, the punching material is pressed into the ironing die or pressed against the dormer at the tip of the punch, so that the punch is held in a so-called cantilever shape. In the ironing machine of the horizontal axis type described above, the tip of the punch slightly bends downward due to its own weight, so that the wall thickness of the body wall of the molded product may be uneven. Further, in order to solve such inconveniences, as described in the above-mentioned Japanese Patent Application Laid-Open No. Sho 60-184429, there is a problem that special measures such as arranging dice at an angle must be taken. Furthermore, in the horizontal-shaft type ironing machine, it is extremely difficult to hold a plurality of punches that move simultaneously back and forth exactly in parallel due to the bending of the punch as described above. The ironing machine must be provided with only one punch, one set of ironing dies and a dormer. That is, conventional ironing machines of the horizontal axis type can obtain only one molded product in one stroke, and in order to increase the production amount, it is necessary to install a large number of ironing molding machines, which increases equipment costs. there were.

[0005] Further, in the rotary type vertical axis type apparatus described above, a molded product can be obtained by ironing and doming of the bottom portion of the molding material by one continuous operation, and, unlike the horizontal axis type apparatus, a punch is formed. There is no risk of bending.
However, as the dies provided on the support member are moved by the rotation of the turret, the punches that are fitted into the recesses of the upper guide arm and are attached to the holders that slide up and down by the cams and individually move are aligned. This is very difficult and has the disadvantage of requiring a complicated mechanism. Even if the alignment can be adjusted, in the case of a rotary type device, since a molding load is applied only to a very limited range on the circumference through which the rotating die moves, the offset load may be shifted toward the frame of the device. Needs to be strengthened to maintain the molding accuracy. In any case, in the above-mentioned conventional rotary type apparatus, the structure is complicated and the size is large, and the workability is poor, so that it is difficult to implement.

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide an ironing machine capable of simultaneously performing a number of ironing operations without causing inconvenience such as uneven thickness and improving productivity. It is the purpose.

[0007]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention is an ironing molding machine for performing molding by pushing a molding material through an ironing die with a punch. While being held in a suspended state so as to move up and down, ironing dies are arranged below the punches on the same axis as the punches, and the bottom of the molded product is formed into a predetermined shape below the ironing dies. A bottom forming tool is arranged, and further provided is a removing means for detaching the molded product fitted to the tip of the punch from the punch.
The receiving member on which the molded product detached from the
Moves back and forth between the tip side of a punch and the bottom forming tool
And a carrying-out means for carrying out the molded product on the receiving member .

[0008]

[0009] Furthermore, in this invention, the discharge means may be constituted by an endless belt of a pair of carrying out across the molded article from both sides.

[0010]

In the ironing forming machine of the present invention, a plurality of ironing dies are provided, and the forming material is placed on the ironing dies. Punches are provided corresponding to each ironing die, and the punches are held in a suspended state, so that they are located on the same axis as the ironing die without any special means. When this punch descends, each molding material is pushed into the ironing die and ironed,
The wall thickness of the body is made thinner, and it becomes a deep bottomed cylindrical shape. When the punch descends to the vicinity of the lower end, the bottom of the forming material is pressed against the bottom forming tool, and the bottom is formed, that is, the bottom is deformed into a predetermined shape. When the punch rises, the molded article rises together with the punch while being fitted to the punch, but is separated from the punch by the extracting means on the way . The molded product is
Once on the receiving member that has advanced to the position below the punch.
After that, a predetermined amount is set on the receiving member by the unloading means.
It is carried out to the place.

[0011]

Further, if the carrying-out means is a pair of endless belts which carry out the molded product while sandwiching the molded product from both sides, the molded product extracted from the punch and placed on the receiving member can be quickly and reliably carried out by sandwiching the molded product from both sides. Can be.

[0013] Since a series of such forming steps are performed simultaneously by a plurality of punches and dies, a large number of ironed products can be obtained in one stroke.

[0014]

Next, an embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a partially cutaway perspective view showing an embodiment of the present invention. The example shown here is configured as a quadruple vertical ironing machine. That is, a pair of a die plate 1 and a punch plate 2 are arranged horizontally and parallel to each other so as to face each other, and the punch plate 2 is mounted on guide posts 3 erected at four corners of the die plate 1 under the punch plate 2. By fitting the guide sleeve 4 provided in the die plate 1, the guide sleeve 4 moves up and down while maintaining the state parallel to the die plate 1. At the center of the lower surface of the punch plate 2, four punches 5 are attached in a horizontal line and in a suspended state.

On the other hand, at the center of the upper surface of the die plate 1,
A gate-shaped die holder 7 that holds a set of three ironing dies 6 for each punch 5 is arranged. The ironing die 6 is, like the conventional one, a set of three annular ones whose inner diameter gradually decreases, and these are inserted into slits 8 formed in the die holder 7 to form a punch. 5 and are arranged and held on the same axis. FIG. 2 is a sectional view showing an arrangement of ironing dies 6 provided for any one of the punches 5.

Below each of the ironing dies 6 of each set, a stripping means or stripper 9 held by a die holder 7 is arranged. This is for releasing a molded product (for example, an iron-formed can) 10 fitted to the punch 5 from the punch 5, and is shown in FIGS.
As shown in the figure, a plurality of claw members 11 are arranged in a ring so as to move back and forth in the radial direction, and these claw members 11 are bound by a spring 12 to apply a preload in the center direction. The inner diameter of the punch 5
Is set to be slightly smaller than the outer diameter of.

At the lower limit position of each punch 5 on the upper surface of the die plate 1, a dome forming tool 13 as a bottom forming tool is provided.
Is arranged. The dome molding tool 13 is for performing doming molding in which the center of the bottom surface of the molded product 10 is curved so as to protrude upward. The doming die 14 has a convex curved upper surface, and is disposed on the outer periphery and has an inner periphery. A doming sleeve 15 having a tapered shape whose surface expands upward.
By lowering 5 relatively to the doming die 14, the center of the bottom surface of the molded product 10 is curved upward (inward) into a convex spherical shape.

Slightly above each dome molding tool 13,
A shutter device 16 for receiving the molded product 10 separated from the punch 5 by the stripper 9 is provided. FIG. 2 shows only the shutter device 16 for the punch 5 located at one end, but similar shutter devices 16 are arranged for the other punches 5. These shutter devices 16 are configured to move a flat shutter 17 back and forth by a driving means such as an air cylinder 18 in a direction orthogonal to the arrangement direction of the punches 5. The forward movement of the shutter 17 is performed with the timing of the vertical movement of the punch 5 so as not to interfere with the punch 5. Therefore, the driving means for the punch plate 2 is replaced with the punch cylinder 2 instead of the air cylinder 18. A device that converts the vertical driving force into a horizontal driving force of the shutter 17 by an appropriate link mechanism and transmits the horizontal driving force can be adopted.

A discharge belt conveyor 19 is provided above each dome forming tool 13 in correspondence with each shutter device 16. The carry-out belt conveyor 19 carries out the molded product 10 on the shutter 17 to the front of the shutter device 16, and a pair of traveling belts that sandwich the molded product 10 standing on the shutter 17 from both sides. It is constituted by an endless belt 20.

Further, on the upper surface of the die holder 7,
Molding material, cup 21 made by drawing
Is provided immediately below each punch 5. This is composed of a guide 23 for arranging the cups 21 in a line and feeding the cups 21 immediately below the punch 5, and a holding tool 24 for positioning the cup 21 on the same axis as the punch 5 at the tip end. The presser 24 is a rotating disk-shaped member having a cutout corresponding to the shape of the cup 21 at a part of the outer periphery. The cutout sends the cup 21 directly below the punch 5 and positions the cup 21. It has become.

Next, the operation of the ironing machine will be described. First, the ironing machine is set on a press machine, and the punch plate 2 is mounted on a slide (not shown) of the press machine. 2
2 feeds directly under each punch 5. As shown in FIG. 4, the cup 21 is an intermediate product having a draw-formed shallow depth and a bottom, and is arranged in a line by a guide 23 of a feeder 22. It is fed directly below the punch 5 and is positioned on the same axis as the punch 5. In this state, when the ram is lowered to push down each punch 5 together with the punch plate 2, the tip of each punch 5 is fitted into the cup 21 and pushed into the ironing die 6. This ironing die 6
In this embodiment, three pieces whose inner diameter gradually decreases are used as one set, and the cup 21 passes through these ironing dies 6 to gradually reduce the wall thickness of the body, and Deepens. In this case, each punch 5 is attached to the punch plate 2 in a suspended state, and each punch 5 is held at a position on the same axis as the corresponding ironing die 6 and descends without bending. Since the cup 2 can be accurately passed through the ironing die position, ironing can be performed without causing uneven wall thickness.

The cup 21 that has passed through the ironing die 6, that is, the molded product 10, pushes and expands the claw member 11 of the stripper 9, and further descends. Therefore, the molded article 10 passes between the belts 20 of the carry-out belt conveyor 19 and is pressed against the dome molding tool 13. In this dome forming tool 13, the doming sleeve 15 is lowered relative to the doming dice 14 by the punch 5, so that the bottom of the molded product 10 is curved so as to be convex upward as shown in FIG. That is, doming molding is performed.

When the punch 5 is lowered to the lowermost end,
The upper end of the molded product 10 has come out below the stripper 9, and the molded product 10 is fitted in close contact with the punch 5. Therefore, the molded product 10 also rises due to the rise of the punch 5, but at this time, since the claw member 11 of the stripper 9 is in close contact with the outer peripheral surface of the punch 5, the upper end of the molded product 10 is raised by the rise of the punch 5. As a result, the molded product 10 is prevented from rising, and as a result, the molded product 10 is pressed down relatively to the punch 5 and detached from the punch 5. At this time, pressurized air is injected from the tip of the punch 5 to assist in the separation of the molded product 10. At this point,
Since the shutter 17 is advanced to a position below the punch 5 by the air cylinder 18, the molded product 10 detached from the punch 5 is received by the shutter 17, and is placed upright thereon. The molded product 10 on the shutter 17 is sandwiched from both sides by a pair of endless belts 20 and is carried out from a position below the punch 5.

The above-described ironing is performed simultaneously and similarly in the four punches 5, so that four moldings 10 are obtained by one vertical movement of the punch plate 2 attached to the slide of the press machine. The number can be increased by the number of punches 5 attached to the punch plate 2 and the number of ironing dies 6 and dome molding tools 13 provided correspondingly.

In the above embodiment, three ironing dies were used. However, the number of ironing dies provided in correspondence with one punch 5 is not limited to three. A number of ironing dies can be used. Further, the receiving member of the present invention is not limited to the above-described shutter device, but may be any member that can be detached from the punch and receive a molded product in an upright state.

[0026]

As described above, according to the multiple ironing machine of the present invention, a plurality of punches which are moved up and down are held in a suspended state, and ironing dies are provided corresponding to the respective punches. Therefore, a plurality of ironing products can be obtained simultaneously in one stroke, and each punch and the corresponding ironing die can be accurately positioned on the same axis, and at the same time, the punch moves up and down in the axial direction. Since there is no possibility of bending, molding defects such as uneven thickness can be prevented. In addition, by providing a receiving member for receiving the molded product detached from the punch, the molded product
It is possible to prevent the molded product from being overturned and to be damaged.

[Brief description of the drawings]

FIG. 1 is a perspective view showing an embodiment of the present invention with a part cut away.

FIG. 2 is a cross-sectional view showing an arrangement of ironing dies and the like for any one punch.

FIG. 3 is a bottom view of the stripper.

FIG. 4 is a sectional view of a cup as a molding material.

FIG. 5 is a cross-sectional view of an ironing molded product.

[Explanation of symbols]

 Reference Signs List 5 punch 6 ironing die 9 stripper 10 molded article 13 dome molding tool 16 shutter device 19 carry-out belt conveyor

──────────────────────────────────────────────────続 き Continuation of front page (51) Int.Cl. ⁶ Identification code FI B21D 45/00 B21D 45/00 C 51/26 51/26 X (56) References JP-A-63-140727 (JP, A) Shokai 55-55239 (JP, U) JP-B 60-26617 (JP, B2) (58) Fields investigated (Int. Cl. ⁶ , DB name) B21D 22/28 B21D 45/00 B21D 51/26

Claims (2)

(57) [Claims] 1. An ironing forming machine which presses a forming material by pressing a forming material into the ironing die so as to penetrate the ironing die, wherein a plurality of punches are held in a suspended state so as to move up and down, and a plurality of punches are provided below the punches. An ironing die is arranged on the same axis as the punch, and a bottom molding tool for molding the bottom of the molded article into a predetermined shape is arranged below the ironing die, and furthermore, a molding fitted to the tip of the punch. Extraction means for detaching the product from the punch is provided, and the extraction means removes the article from the punch.
The receiving member on which the molded product is placed is the punch
So that it can move back and forth between the tip side of the
Is location, further multiple-ironing molding machine, characterized in that said receiving unloading means for exiting transportable moldings on member. 2. The multiple ironing and forming machine according to claim 1, wherein the unloading means is a pair of endless belts which sandwich and discharge the molded product from both sides.