KR850001366B1 - Triple action container drawing and redrawing apparatus - Google Patents

Abstract

An apparatus for forming cup-shaped metal containers from a metal bank by drawing and then redrawing the blank to its finished configuration is disclosed. The aparatus is intended for use in a double-acting press having inner and outer rams that operate in a relatively timed relationship. The means for performing the drawing operation are operatively associated with the outer ram and the means for performing the redrawing operation are carried out by the inner ram.

Description

Device for drawing and redrawing containers in three motions

1 is a partial cross-sectional view schematically showing the drawing, redrawing and die elements of an improved apparatus with the press open and with the material inserted into the press.

FIG. 2 is a sectional view similar to FIG. 1 showing the press closed to the die line. FIG.

FIG. 3 is a cross sectional view similar to FIG. 1 showing a state in which the device has almost completed drawing operations.

4 is a cross-sectional view similar to FIG. 1 showing a state in which the device is about to start a redrawing operation.

FIG. 5 is a cross sectional view similar to FIG. 1 showing a state in which the device is about to complete the redrawing operation and begin to move up.

6 is a cross-sectional view showing a state in which the device has completed the redrawing operation.

7 is a diagram showing the relative positions of the inner and outer rams and the position of the device through full 360 ° cycle operation.

The present invention relates to an apparatus for forming a two-cup same cup-shaped container with high strain rate, in particular an apparatus for performing an effective molding operation in three operations in association with a double-acting press.

Background Art It is known to form cup-shaped metal containers from a metal material by drawing and then redraw the containers to the finished detective. The device was intended for use in double acting presses with inner and outer rams operating at relative time differences. The device for performing the drawing operation is operatively associated with the outer ram and the device for performing the redrawing operation is carried by the inner ram. The drawing device is operated by compressed air and the redrawing device on the inner ram is slidably accommodated in the drawing device of the outer ram and at the same time has a shoulder extending in the outer circumferential direction for interworking with the drawing device. The movement of the drawing device for at least one moving part is delayed, thereby adjusting the operating time of the drawing device and modifying the drawing and redrawing functions.

In container manufacturing techniques, a first molding member is used to perform a work called "draw" to preform a metal material into a cup-shaped container and then a work called "redraw" to deform the container to its final shape. It is well known to shape a container by using a second forming member to perform it.

While the above-mentioned prior art devices are presumed to be effective for the purpose for which they are designed, it has been found that it is desirable to provide a three-actuating device that can be placed in a press that has been used conventionally without any significant changes to draw the container. . It has also been found that it is desirable to avoid mechanically metal-to-metal contact involved in the downward support action during drawing and redrawing operations.

Thus, it has been found that these objects can be achieved and that such a device can be braked suitable for use with current conventional presses. An example of such a press can be seen in U. S. Patent No. 3902347 issued to Ridgeway, which is connected by a crankshaft in conjunction with a pair of offset cranks providing a time interval between the operation of the inner and outer rams. A mechanical press with an actuated inner and outer ram is presented. The invention is intended to be used in presses having these general properties, although their use does not need to be limited to precise structures such as those described in Ridgeway's patent.

In order to achieve the above object of the present invention, it has been found that an improved result can be obtained by means of a device in which the drawing device is operatively connected to the outer ram while the redrawing device is operatively connected to the inner ram. .

It has also been found to be advantageous to use compressed air pressure to perform various downward support functions during both operations.

In addition, in order to minimize the required travel length of the ram and to take into account the fact that the outer ram moves ahead of the inner ram, the slits for at least one predetermined moving portion of the inner ram by interfering with the movement of the drawer of the outer ram It has been found to be advantageous to provide a redrawing apparatus and an interconnecting device carried by the inner ram to delay the movement of the eve.

It has been found that the length of the stroke is greatly reduced by such a facility, while the effect of compressed air operation is necessarily improved.

Accordingly, it is a main object of the present invention to provide an improved tri-operation drawing and redrawing apparatus having the above-described characteristics, and other objects will become more apparent from the following description with reference to the accompanying drawings.

It should first be appreciated that the apparatus described herein is for use in double acting presses comprising a pair of offset cranks or a crank shaft with a similar drive which provides a suitable time interval between the operation of the inner and outer ram assemblies. Double-acting presses with this feature are well known in the art, one type of which is described in US Pat. No. 3902347 to Ridgeway. Therefore, the detailed press structure is not shown here as it is understood that the device can be installed and used in existing presses of the general type well known in the container forming industry.

Referring to FIG. 1, the major elements of the improved device include an inner ram punch holder 10, an outer ram punch holder 110, and a lower pedestal 20. The punch holders 10 and 110 will be operated in a conventional manner by being fixed to the inner and outer rams of the double-acting press of the type described above to move together.

Considering the lower pedestal 20 first in FIG. 1, the pedestal 20 is fixed to the upper surface thereof with a matrix 21 held in place by screws 23, the upper part of the matrix 21. A drawing die 22 is provided on the surface. Although only one screw 23 is shown, a plurality of screws may be used as necessary.

These elements (matrix 21, drawing die 22) are substantially annular and are arranged axially and have appropriately sized center holes 21a, 22a for accommodating the container during drawing operations.

In addition, a redrawing die 24 is housed in the cutout 20a on the upper surface of the lower pedestal 20. This redrawing die 24 is effectively held in place due to the fact that the matrix 24 lies in a part of the upper surface. The redrawing die 24 is also smaller than the opening of the drawing die 22 and is redrawn. It has a center hole 24a sized to accommodate the container in the main.

The through holes 25 in the lower pedestal 20 are coaxially arranged with the center holes 22a and 24a of the drawing die 22 and the redrawing die 24. This hole provides space for receiving the drawn and redrawn containers, and also provides a passage for this assembly if a conventional knockout assembly is used, although not shown. This hole also allows the container to be removed by blowing compressed air, if desired.

Referring next to the structure associated with the inner ram, the inner ram punch holder 10 is fixed to the upper end of the alternating cylindrical riser 11 by a suitable screw 11a, with only one screw being shown. The riser 11 is actually elongated and has an axially extending passage 11b, which is adapted for the purpose of evacuation or as necessary to blow compressed air into the finished vessel. Through. Since the inner ram punch holder 10 also has a passage 10a in communication with the passage 11b, exhaust from the vessel to the atmosphere and blowing of compressed air can be achieved as described.

At the lower end of the riser 11, a redrawing sleeve assembly 30 is arranged. This assembly comprises a cylindrical redrawing sleeve conveying member 31 and a cylindrical shaping sleeve 32. Both of these elements have passages 31a and 32a respectively located in fluid communication with passage 11b in the riser for evacuation and blowing.

The redrawing sleeve conveying member 31 is fixed to the lower end of the riser 11 by a screw 33, and in the same way, the molding sleeve 32 is fixed to the conveying member 31 by a screw 34. .

Further, the sleeve conveying member 31 is defined in the shoulder 31b which is radially ended adjacent to the upper end thereof, and the cooperation between the shoulder and other elements is an important part of the present invention and will be described in detail below. will be.

Subsequently, referring to the outer ram punch holder 110, the cover plate 111 is fixed to the upper part of the punch holder by the screws 112 and sealed by the seal 111a with respect to the riser 11. This punch holder 110 is effectively installed surrounding the riser 11 and the redrawing sleeve assembly 30 for relative movement along its longitudinal axis as described.

The outer ram punch holder 110 also includes a number of additional elements.

First, the first cylindrical pressure piston 50, together with the appropriate seals 51, 52, 53, which serve to ensure the riser 11 and the liner 58 in a relatively tight engagement, the pressure chamber 50a It is arranged inside. Moreover, as the conduit 55 is connected to a relatively high pressure compressed air source, the pressure supplied through the conduit 55 will affect the top of the piston 50. The first pressure piston 50 operates in the pressure chamber 50a as described, which also includes a lower wall 57 in communication with the exhaust port 56. The pressure chamber 50a is formed of a lower wall 57, an outer circumferential surface of the riser 11, a lower portion of the cover plate 111, and a liner 58.

In addition, a second cylindrical pressure piston (60) provided below the first pressure piston (50) is arranged to surround the riser (11) and the redrawing sleeve assembly (30). The second pressure piston 60 also has a plurality of seals 61, 62, 63 and the pressure chamber 60a also has a bottom wall 67 and an exhaust port 66. Therefore, this pressure chamber 60a is also formed by the lower wall 57, the outer circumferential surface of the riser transfer member 31, the lower wall 67, and the liner 68.

The second pressure piston 60 is attached with a cylindrical drawing sleeve 40 which is fixed by a screw 41 and relatively movable with the piston 60 relative to the redrawing sleeve assembly 30.

At this time, the second pressure piston 60 extends inwardly as shown on the upper part of the shoulder 31b and the drawing sleeve 40 on the redrawing sleeve conveying member 31 in FIG. Shoulder 60b.

Under the third pressure piston 70 is a drawn pressure pad 42, in which the upper surface is in contact with the lower surface of the piston 70 at the position of the components shown in FIG. 1. This drawing pressure pad 42 is movable vertically in the pressure chamber 70a.

Adjacent to the lower end of the outer ram punch holder 110, it is fixed in position by a blanking ring 43, and the wear sleeve 44 is between the lower part of the piston 70 and the upper part of the blanking ring 43. Is fitted on.

Operation steps are shown with reference to the cross-sectional views of FIGS. 1 to 6 to illustrate the operation of the improved device. In all cases, however, reference should be made to FIG. 7 showing the position of the inner and outer rams in response to the crank position on the press and the specific circulation arrangement at any given operating stage. In this regard, it should be noted that the outer ram must be driven prior to the inner ram.

Thus, referring again to FIG. 1, the press apparatus is in an "open" position in which the outer ram is positioned at the top of its stroke and the material 200 is inserted into the press at the top of the draw die 22 by a conventional feeder. You will see that At this time, the outer ram punch outer ram holder 110 is moved downwards and the inner ram structure is about to start such a movement. In addition, the relatively high pressure compressed air already mentioned is injected into the outer ram housing through the conduit 55 to act on the top of the first pressure piston 50.

Referring to FIG. 2, the outer ram moves to approximately 316 ° and the outer ram punch holder 110 approaches the "die line" position. The normal pressure pad 42 is then in contact with the material 200 and maintained in contact by relatively low pressure compressed air acting on the piston 70 through the conduit 75 to provide the required downward support pressure. do.

Of course, the inner ram also continues its downward movement, at which time the sleeve transfer member 31 and the shoulders 31b and 60b of the piston 60 are in contact with each other. In fact, this contact causes the inner ram to delay the movement of the piston 60 and the primary sleeve 40 carried by the outer ram punch holder 110 despite the fact that the outer ram housing precedes the operating cycle. There is a tendency.

Referring to FIG. 3, just before the initial drawing is done, the blanking ring 43 is moved downward with the punch holder 110 to cut excess material. By further moving downward the initial drawing is carried out and the outer ram reaches approximately 336 °. At this time, the relatively high pressure compressed air injected through the conduit 55 acting on the first pressure piston 50 moves the piston 50 downward. The first pressure piston 50, which is in linkage with the piston 60, similarly moves the piston 60 downwards and is fixed to the piston 60 so that the drawing sleeve 40 has a common velocity of the drawing die 22. The material 200 is molded in the form shown in FIG.

Referring to FIG. 4, the compressed air acting on the first pressure piston 50 is released at this point by the piston 50 placed on the lower wall 57 of the pressure chamber 50a and a suitable time adjustment device. Will be. This figure shows that the outer ram starts redrawing at about 356 °. Low pressure compressed air entering the passage 65 and acting on the second pressure piston 60 is still active and low pressure compressed air acting on the third pressure piston 70 through the conduit 75 is also present. It is the same.

At the same time, the inner ram also continues its downward movement, and the riser 11 is shown to begin acting on the material 200 to perform the redrawing operation in FIG. 4. It has a force to downward.

At this time, the shoulder 31b of the sleeve conveying member 31 and the shoulder 60b of the second pressure piston 60 are separated and the outer ram substantially stops its downward movement. However, the low pressure compressed air acting on the piston 60 and the piston 60 is sufficient to achieve the downward supporting function as required by the drawing sleeve 40 itself.

Next, referring to FIG. 5, the redrawing operation is almost completed and the outer ram is about 40 degrees, in other words, the position to start moving upward. It should be noted that the drawing slave 40 can immediately start moving up because downward support is rarely needed during the completion of the redrawing. Of course, the riser 11 and the inner ram structure is approaching the bottom inclination at this time.

FIG. 6 shows a state in which the inner ram assembly is completely lowered and the outer ram assembly is removed from the lower pedestal 20. This operation also raises the draw sleeve 40 from the bottom support 20.

If movement of the inner and outer rams continues, the elements return to the position of FIG. 1, where a knockout device or other device using a method such as blowing compressed air may act to remove the finished container from the die cavity.

In addition, the exhaust system formed by the passages 32a, 31a, 11b, 10a where the sleeve assembly 30 is to be recovered prevents the vessel from collapsing.

Finally, the inner surface is effectively moved by the action of the shoulder 31b relative to the lower portion of the shoulder 60b of the second pressure piston 60 until the elements reach the position shown in FIG. Delays. However, once the position of FIG. 4 is reached and the high pressure compressed air source is shut off from the piston 50, the parts can be separated and the transfer member 31 can achieve its function.

Claims (1)

Movement of the outer ram is performed prior to the movement of the inner ram and used together in a double-acting press with inner and outer rams reciprocating at relative time intervals such that the inner and outer rams can move forward and backward relative to the forming die. In the drawing and redrawing apparatus, The drawing device, which is moved toward the forming die by the outer ram, includes a first pressure piston 50 and the first pressure piston 50 reciprocally operated by a relatively high pressure compressed air source in the outer ram punch holder 110. The second pressure piston 60 positioned below and reciprocally operated in contact with the first pressure piston 50 by a relatively low pressure compressed air source and the shoulder 60b extending radially inward adjacent the upper end; A redrawing apparatus having a cylindrical drawing sleeve 40 fixed to a second pressure piston 60 and slidably disposed in the drawing apparatus and operated by the inner ram, the inner and outer ram facing the forming die. The inner and outer rams while being positioned under the shoulder 60b of the second pressure piston 60 and automatically engaged with the shoulder 60b to retard the movement of the drawing device during the movement of Redrawing sleeve transfer member 31 having shoulder 31b extending radially inward adjacent to the upper end such that the engagement with the shoulder 60b is released as the movement of the drawing device towards the forming die is completed during further movement. And a redrawing sleeve assembly (30) comprising a molding sleeve (32) fixed to the lower portion of the conveying member (31).

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