JP2000140952A - Double action type press - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a double action, that is, a counteracting drawing press for drawing a drink container, which has an improved mechanism for keeping a side wall thickness to a minimum dimension. SOLUTION: A curved line shape defining a lower part slide dowel, is changed without affecting a dowel area or a lower part slide displacement during a maximum compression applied to a drawing cushion. The dowel area of the lower part slide is changed so that the maximum compression of the drawing cushion occurs during the maximum compression is retained in a part in which the side wall of a container becomes usually thickest. Consequently, the elongation of a can in this area is made large, then the production of a drink container or a cup whose thickness of the side wall is more uniform to a height is attained.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

FIELD OF THE INVENTION The present invention relates to double-acting drawing presses, and more particularly to those drawing presses used by body makers for drawing beverage containers and other metal workpieces.

[0002]

2. Description of the Related Art In prior art devices and methods for beverage container withdrawal, the sidewall thickness closest to the bottom or lid of the container is usually greater than the remaining container walls. This is a waste of material, as flush containers can be made of less material if the sidewalls can be kept to a minimum dimension consistently throughout the can. Alternatively, if the sidewall thickness can be kept to a minimum dimension, the container height can be increased using the same amount of material as the existing container.

[0003] Prior drawing or stamping presses have utilized a top slide to hold the dice to draw a beverage container from the raw material. To compress the withdrawal cushion, a lower slide that retained the raw material during the withdrawal action of the top slide was utilized.

In the prior art, the lower slide dwell time began at a crankshaft angle of approximately 90 degrees with a top dead center position of approximately 133 degrees. The dwell area of the lower slide (used to hold the raw material during the drawing operation) ends at a crankshaft angle of 180 degrees.

[0005] During this dwell time, several times after the lower slide contacts the withdrawal cushion, the upper slide initiates punching or withdrawal cutting of the cup held by the withdrawal cushion. At the bottom dead center of the upper slide,
Reach near the dwell time on the lower slide. The amount of holding force on the can is determined by the compression of the withdrawal cushion between the lower slide and the withdrawal cushion itself.

[0006] What is needed for this technique is a double-action drawing press that can consistently keep the side wall thickness of a cup or beverage container to a minimum thickness.

[0007]

SUMMARY OF THE INVENTION The present invention provides a double acting or counter-acting drawing press having an improved mechanism for maintaining a minimum side wall thickness dimension for a drawing cup or beverage container. The present invention changes the shape of the curve defining the lower slide dwell during the maximum compression on the dwell area or pullout cushion without affecting the overall lower slide displacement. The dwell area of the lower slide is modified so that maximum compression of the withdrawal cushion generally occurs while withdrawing the thickest container sidewall portion. This gives the cans in this area a large stretch and helps to produce containers or cups with more consistent wall thickness over height.

[0008] In one form, the present invention comprises a double-acting press having a pull-out cushion and a frame. A lower slide reciprocating within the frame is provided to compress the pullout cushion. further,
Driving means for driving the lower slide relative to the frame at a predetermined dwell time is included, and the driving means includes:
Maximum compression between the lower slide and the withdrawal cushion occurs within the last third of the dwell time.

The invention, in another form thereof, comprises a double acting press having a pull-out cushion and a frame. A lower slide reciprocating within the frame is provided to compress the pullout cushion. Further, a driving means for driving the lower slide relative to the frame at a predetermined dwell time is included, the driving means moving the position of the upper dead center of the lower slide within the last third of the dwell time. Is caused.

[0010] The present invention, in yet another form thereof, comprises:
It consists of a double-acting press having a pull-out cushion and a frame. A lower slide reciprocating within the frame is provided to compress the pull cushion. An eccentric mounted on the crankshaft is provided on the crankshaft. A bell crank is used having a first end and a second end, the first end being disposed around the eccentric portion. At this time, the knuckle joint is pivotally connected to the second end of the bell crank by further including a pinion in the knuckle joint. A second link is used having a first end and a second end, the first end pivotally mounted on the pinion.
This second link allows the upper slide dead center position of the lower slide to occur within the last third of the dwell time and creates a sufficiently long dwell time for the lower slide,
It is longer than the first link. A stationary pivot is attached to the frame at one end and is pivotally connected to the second end of the first link. At this time, a drive piston having a first end and a second end is used, and the first end is pivotally connected to the second end of the second link, and the second end of the drive piston is connected to the lower slide for a predetermined dwell time. Mounted on the lower slide for movement with respect to the frame.

An advantage of the present invention is that in beverage container or cup production, the side-to-side height is more uniform and consistent.

Another advantage of the present invention is that by keeping the sidewall thickness uniform, less material is consumed.

Yet another advantage of the present invention is that the beverage container or cup is consistently kept to a minimum size, so that the same material can be used to make the container significantly larger. Another advantage of the present invention is that the dwell of the press slide is shaped to produce maximum holding down force, and thus maximum extension of the can side wall at the appropriate time during the drawing operation.

[0014]

1 is a perspective view of a double acting or counter-acting press having a frame; FIG. As shown in FIG. 1, the press 10 includes an upper slide 14 and a bottom or lower slide 16 both reciprocating within a frame 12. Two upright columns 18 connect between the press bed 20 and the portion of the press crown 22.

The dice (not shown) mounted on the upper slide 12 may be any suitable one known in the art, mounted thereon, and co-worked with the dice on the lower slide 16 in the raw state. Suitable for having forming dies for deep drawing metal from metal. The dies are not shown as they may be in any desired form without forming part of the present invention. In addition, a withdrawal cushion or balancing device is not shown as it is not required for an understanding of the present invention.

The lower slide 16 is activated by drive means located in the bed, at which time the lower slide 16
Engages a workpiece placed in the die space just before the start of the working part of the withdrawal stroke, ie the upper slide 1
The engagement of the die from the die slide from 4, the die slide begins its return movement and remains in its holding position until after it has been removed from the forming die, i.e., it is ascertained that metal has been formed.

FIG. 2 shows the mechanism constituted by the crankshaft 24 held in the journal 26 for operating the lower slide 16. A connecting portion 28 is formed or attached to the crankshaft as shown in FIG. A bell crank 30 is mounted around the eccentric portion 28. Bell crank 30 includes a first end 32 suitable for placement around eccentric portion 28. Bell crank 30 also includes a second end 34 pivotally connected to a knuckle joint 36. The knuckle joint 36 includes a pinion 30 to which a first link 40 and a second link 42 are pivotally mounted.
As shown in FIG. 2, the first link 40 has an opposite end 4 attached to a stationary pivot 46 attached to the frame 12.
4 inclusive. The opposite end 44 of the first link 40 is attached to a stationary pivot 46 by a pivot pin 54. The second link 42 connects the lower slide 16 near the end of the dwell time.
It is longer than the first link 42 in order to obtain the movement required to create the desired dwell time to reach the upper dead center position. At the opposite end 48 of the second link 42 is mounted a drive piston 50, also mounted on the lower slide 48. Opposite end 48 of second link 42
Is attached to the drive piston by a pivot point 52.

By choosing different relative dimensions between the first and second links, various dwell portions and times are created.

FIG. 4 shows the movement of the lower slide 16 for a particular angle of rotation of the crankshaft. At a crankshaft angle of 0 degrees, the lower slide displacement is about 140 mm. At a crankshaft angle of about 90 degrees, the dwell area for the lower slide begins and is now sufficient to compress the withdrawal cushion, which holds the raw material and the action of the top slide 14 is a container (not shown). To be able to pull out properly. Dwell region 10 is approximately 90
Degrees to 210 degrees. After about 210 degrees, the lower slide 16 separates from the withdrawal cushion until it bottoms out at a crankshaft axis angle of about 315 degrees at which the displacement of the lower slide 16 is about 200 mm. After about 315 degrees, the lower slide 16 begins to return toward the dwell area and the withdrawal action is repeated.

Of interest during the lower slide 16 movement is the location of the upper dead center. The top dead center position of the present invention occurs at a crankshaft angle of about 180 degrees. At this crankshaft angle relative to the top dead center position, the lower slide 1
The 6 dwell area is at maximum compression with respect to the withdrawal cushion, during which the portion of the thickest can side wall is typically withdrawn. This results in a large spread of the raw material in this area and helps to produce cans with more consistent sidewall thickness over height.

The change in curve shape that defines the lower slide dwell, as experienced in the prior art (see FIG. 3),
It does not affect the overall displacement of the lower slide during the maximum compression of the dwell area or withdrawal cushion. In the prior art, the dwell area for the lower slide has a crankshaft angle of approximately 90-100 degrees and a top dead center of about 133 degrees. There is typically a displacement of approximately 2.5 mm within the dwell time. In the present invention, no displacement of the lower slide 16 is performed except for a change in the position of the upper dead center.

A dwell is formed at an appropriate time during the drawing operation to produce maximum holding force (and thus maximum extension of the can side wall).

Alternative embodiments can place the dwell time at other crankshaft angles other than 90 to 210 degrees. This is achieved by changing the phase angle on the crankshaft between the upper slide and lower slide strokes. The top dead center position is determined by simply rotating the crankshaft in the opposite direction to set the phase angle to either be in the first third of the dwell time or instead in the first and last third of the dwell period. Just by adjusting, you can change it. This can also be achieved by adjusting the geometry or position of the connecting pivot.

In an alternative embodiment, the top dead center of the lower slide is shifted by 90 degrees during the dwell time simply by shifting the piston housing (for piston 50) by 90 degrees.
It can be placed in a position other than 210 degrees to 210 degrees. Such an action affects the position of the upper dead point of the lower slide.

Although the invention has been described as having a preferred embodiment, the invention can be further modified within the spirit and scope of the invention. This application is therefore intended to cover any variations, uses, or adaptations of the invention using its general principles, implementations in the art to which this invention pertains, and those within the scope of the appended claims. The above and other features and advantages of the present invention, as well as methods of modifying them, will become more apparent and better understood by reference to the following description of an embodiment of the invention taken in conjunction with the accompanying drawings. Will be appreciated.

[Brief description of the drawings]

FIG. 1 is an elevation view of a body maker.

FIG. 2 is a cross-sectional view of a drive connection in one embodiment of the present invention.

FIG. 3 is a graph of a prior art slide motion having a top dead center location near the center of dwell time.

FIG. 4 is a graph of the sliding motion of the present invention with the top dead center position near the end of the dwell time. Corresponding reference characters indicate corresponding parts throughout the several figures. The examples given here are only one embodiment of the invention in one form and should not be construed as limiting the scope of the invention in any way.

Claims (8)

[Claims] 1. A double-acting press having a pull-out cushion, comprising: a frame; a lower slide for reciprocatingly sliding in the frame to compress the pull-out cushion; A drive means for only driving, said drive means causing a maximum compression between said lower slide and said withdrawal cushion within the last third of the dwell time. 2. The drive means comprises: a crankshaft; an eccentric mounted on the crankshaft; a first end and a second end, the first end disposed around the eccentric portion. A bellcrank, a knuckle joint pivotally connected to the second end of the bellcrank, further including a pinion, and a first end and a second end, wherein the first end is pivotally mounted to the pinion. A link, a first end and a second end, wherein the first end is pivotally mounted to the pinion and is longer than the first link to produce a sufficiently long dwell time for the lower slide. A drive piston having a second link producing the required movement; a stationary pivot mounted at one end to the frame and pivotally connected to the first end of the first link; and a first end and a second end. And said One end pivotally connected to said second end of said second link,
A double-acting press having a pull-out cushion according to claim 1, comprising: a drive piston having the second end of the drive piston mounted on the lower slide. 3. The press of claim 1 wherein the upper slide dead center position of the lower slide occurs at approximately a 180 degree crankshaft angle. 4. A double-acting press having a pull-out cushion, comprising: a frame; a lower slide for reciprocating in the frame to compress the pull-out cushion; A drive means for driving by time, wherein the drive means raises the top dead center position of the lower slide within the last third of the dwell time. 5. The drive means comprises: a crankshaft; an eccentric mounted on the crankshaft; a first end and a second end, the first end being disposed around the eccentric portion. A bellcrank, a knuckle joint pivotally connected to the second end of the bellcrank, further including a pinion, and a first end and a second end, wherein the first end is pivotally mounted to the pinion. A link, a first end and a second end, wherein the first end is pivotally mounted to the pinion and is longer than the first link to produce a sufficiently long dwell time for the lower slide. A drive piston having a second link for producing the required movement, a stationary pivot mounted at one end to the frame and pivotally connected to the second end of the first link, and a first end and a second end. hand, Serial first end pivotally connected to said second end of said second link,
2. The double-acting press with a pull-out cushion of claim 1, comprising: a drive piston having the second end of the drive piston mounted on the lower slide. 6. The press of claim 4, wherein the top dead center position of the lower slide occurs at approximately a 180 degree crankshaft angle. 7. A double-acting press having a pull cushion, a frame, a lower slide for reciprocating sliding within the frame to compress the pull cushion, a crankshaft, and an eccentric attached to the crankshaft. A bell crank having a first end and a second end, the first end being disposed around the eccentric portion; and a knuckle pivotally connected to the second end of the bell crank and further including a pinion. A first link having a first end and a second end, the first end pivotally mounted to the pinion; a first end having a first end and a second end; A second link pivotally mounted on the pinion, longer than the first link, causing the center position of the top dead center of the lower slide to occur within the last third of the dwell time; A second link for providing a sufficiently long dwell time for the lower slide; a stationary pivot mounted at one end to the frame and pivotally connected to the second end of the first link; A drive piston having an end, the first end being pivotally connected to the second end of the second link,
A drive piston having a second end of the drive piston mounted on the lower slide for movement of the lower slide relative to the frame during a predetermined dwell time. 8. The press of claim 1 wherein the upper slide dead center position of the lower slide occurs at approximately a 180 degree crankshaft angle.