JPH10277659A - Method and device for forming a cup having irregular shaped bottom - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method and device for forming a strong cup against the deformation so as to be safely transferred at a speed higher than for the conventional cup. SOLUTION: A device and method in order to form a cup 10 having an irregular shaped bottom generally contains a drawing die 20 arranged on a 1st level of a double action press. The drawing die 20 is co-operated with a drawing pad and a cutting edge 28 to form and hold a blank 28 formed from one sheet of material M. A punch assembly body 30 is composed so as to move through the drawing die 20, with this, the blank 28 is drawn against the drawing die 20 and a cup 60 is formed. The punch assembly body 30 transfers the cup 60 to a 2nd level of the press, where the cup is bottomed with a die core 50 and a ring pad 51. One element of the punch assembly body is continued to move over the 2nd level of the press, with this, a part of the cup 60 is drawn against the die core 50 and the bottom of cup is profiled. After then, the irregular shaped cut 10 is returned to the 2nd level of the press, there it is removed from the punch assembly body 30 and transferred.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

FIELD OF THE INVENTION The present invention relates generally to an apparatus and method for forming a squeeze vessel. In particular, the present invention relates to an apparatus and method for forming a drawn cup having a profiled bottom.

[0002]

One of the initial steps in forming a cylindrical container, such as a carbonated beverage can, is to form a cup. A typical cup includes a circular bottom connected to a cylindrical side. Typically, the cup is shorter and wider than the finished container. From there, the cup
After many processing steps, it becomes a finished container.

[0003] Container production lines are operated at high speed to produce large numbers of containers. Throughout these production lines, the container elements are transferred from one work station to another work station where different production processes are performed. One of the problems in the production line design is that the container elements are deformed when moving between stations. As the speed of the line increases, the number of container elements that are deformed increases. This problem is exacerbated by the increasing economic demand for reducing the size of the material used to form the container. The deformation results from collisions between the container elements or contact between the container elements and the machine.

[0004] One deformation problem arises after the initial process of forming a cup from a flat blank material has begun. Generally, the cup has a circular bottom with straight cylindrical sides. Subsequent processing steps to form the cup are performed by a production facility designed to operate on a substantially cylindrical cup. However, after the cup is first formed, various forces tend to distort the cup. If the cup is sufficiently distorted, the container formed therefrom must be discarded as garbage. In addition, damage and / or jamming occurs in the equipment. Therefore, it is desirable to form a cup that is resistant to distortion and deformation.

Accordingly, it is a primary object of the present invention to provide a method and apparatus for forming a deformation resistant cup that can be transported faster and more safely than conventional cups.

It is another object of the present invention to provide a method and apparatus for forming a cup having a modified bottom that assists the cup in resisting various forces that distort or deform the cup.

Another object of the present invention is to form a cup having a profiled bottom where the profiled bottom draws a normally distorted flat bottom and then straightens the sides of the cup to give the cup a cylindrical shape. Method and apparatus.

[0008] Yet another object of the present invention is to provide a cup having a profiled bottom where unformed material is inserted into a double-acting press at one level and the formed cup is ejected from a different level press. It is to provide a method and apparatus for forming.

[0009]

SUMMARY OF THE INVENTION Generally, an apparatus utilized to form a cup having a profiled bottom in accordance with the present invention comprises an annular draw mold, a punch assembly configured to move through the draw mold, and the punch. A mold core disposed in the path of the assembly, and a ring pad disposed near the mold core and in the path of the punch assembly.

A method of forming a cup having a profiled bottom according to the present invention comprises the steps of punching a section of material at a first level of a double-acting press, and squeezing the blank through a drawing die with a punch assembly to form the cup. Transferring the cup to the second level of the press by the punch assembly; squeezing the cup on the mold core with one element of the punch assembly to profile the bottom of the cup; Returning to the second level of the press and removing the profiled cup from the press.

The above objects of the present application and advantageous effects over the prior art are made clear by the following detailed description and drawings, and are achieved by the means described therein.

[0012]

DETAILED DESCRIPTION OF THE INVENTION A cup having a modified bottom formed by the apparatus and method of the present invention is shown generally at 10 in FIG. The profiled cup 10 includes a generally cylindrical outer wall 11, which is joined at its bottom edge to the outer edge of an annular outer bottom surface 12. The generally cylindrical inner wall 13
It extends coaxially with the outer wall 11 from the inner edge of the outer bottom surface 12 and joins the generally circular inner bottom surface 14.

Referring to FIG. 2, it is assumed that the equipment shown here is incorporated into a double-acting press known to those skilled in the art. It can be assumed that material M is delivered to the press from either the sheet or, if desired, the coil stock.

Taking these assumptions into account, and referring further to FIG. 2, it can be seen that this is a section of the equipment of the present invention. An annular drawing die 20 is carried by a press wall 21. The squeezing pad 22 is arranged on the squeezing die 20 and is carried by the outer slide 23 of the double-acting press. The outer slide 23 is reciprocally movable to move the aperture pad 22 upward away from the aperture die 20 and downward with respect to the aperture die 20.

The cutting edge 24 is arranged on the outer slide radially outward of the drawing pad 22 so that the outer slide 23 lowers the drawing pad 22 to press the material M against the drawing die 20 and then punches the material M. Works. The cutting edge support pad 25 is supported by a spring 26 and is located below the cutting edge 24. When the cutting edge 24 punches the material M, the scrap material 27 in the radial direction of the cutting edge
Is carried by a support pad 25, and a circular blank 28 radially inside the cutting edge 24 is formed by a drawing die 20 and a drawing pad 22.
Held between.

The punch assembly 30 is located radially inward of the drawing die 22 and is carried by the inner slide 31 of the press. The inner slide 31 reciprocates to move the punch assembly 30 vertically through the squeeze mold 20. Punch assembly 30
Includes a centrally located punch core 32 partially surrounded by an annular punch ring 33. The punch core 32 has a substantially flat bottom and a fluid passage 34 extending therethrough. Fluid passage 34 is selectively coupled to a fluid pressure source (not shown), such as pressurized air, and is used for cup removal as described below.

When the punch assembly 30 is in the position shown in FIGS. 2 to 4 and 6, the punch core 32 and the punch ring 33
Are substantially coplanar. However, the inner slide 31
Acts so that the punch ring 33 moves independently of the punch core 32. The punch ring 33 is moved downward through the punch core 32, so that the bottom surface of the punch ring 33 is located below the bottom surface of the punch core 32. However, punch core 32
And a pair of cooperating shoulders 35 formed on the punch ring 33.
Thus, the bottom surface of the punch ring 33 is prevented from rising above the bottom surface of the punch core 32.

[0018] Together with the squeeze die 20, the press wall 21 forms a substantially cylindrical chamber 40 configured to receive the punch assembly 30 and the squeeze cup 10. On one side of the chamber 40, a fluid line 41 extends through the press wall 21. A fluid line 41 is selectively coupled to a source of pressure fluid, such as air, for the purposes described below. On the opposite side of the fluid line 41, the press wall 21 is
Openings 42 configured to allow passage as they are released from
Having.

The bottom of the chamber 40 is formed by the cooperation of the inner mold core 50 and a ring pad 51 surrounding the inner mold core 50. When the inner mold core 50 and the ring pad 51 are in the positions shown in FIGS. 2 to 4 and 6, the upper surfaces of the inner mold core 50 and the ring pad 51 are substantially coplanar. The inner mold core 50 is carried by the lower platen 52 and is fixed during the cup forming process. However, the ring pad 51 is carried by a plurality of springs 53, whereby the ring pad 51 moves vertically with respect to the inner mold core 50 by the pressure from the punch ring 33. To prevent the upper surface of the ring pad 51 from rising above the level of the upper surface of the inner mold core 50,
The pair of shoulders 54 and the ring pad 51 formed on the lower platen 52 cooperate.

A cup 10 having a modified bottom is formed using the apparatus of the present invention according to the following method. One sheet of material M
At the first level of the press, draw die 20 and draw pad
Inserted between 22. When the material M is placed correctly,
The outer slide 23 moves the drawing pad 22 against the material M, whereby the material M is pressed between the drawing pad 22 and the drawing die 20. As the outer slide progresses, the cutting edge 24 cuts a substantially circular blank from the material M. As shown in FIG. 2, the scrap material 27 is
It is carried by 25 and the blank 28 remains pressed between the drawing die 20 and the drawing pad 22.

After the material M is punched, the inner slide 31
Causes the punch assembly 30 to move toward the blank 26 and pass through the drawing die 20. By this movement, the blank 28 is squeezed over the entire edge 20a of the squeezing die 20, and the outer wall 11 of the cup 11 starts to be formed as shown in FIG. As the punch assembly 30 moves through the drawing die 20, the pressing pressure between the drawing die 20 and the drawing pad 22 is controlled by the outer slide 23.

The punch assembly 30 continues to move through the squeeze mold 20 until the entire blank 28 is squeezed against the squeeze mold 20 while forming a cup. In doing so, the inner slide 31 continues to move the punch assembly 30 and cup 60 down to the second level of the press. Cup 60 remains on punch assembly 30 as shown in FIG. When the punch core 32 is bottomed on the inner core mold 50, the punch ring 33 is moved downward against the ring pad 51 by overcoming the force of the spring 53 by the inner slide 31. This movement of the punch ring 33 causes the bottom surface of the cup 60 to be squeezed across the edge 50a of the inner mold core 50 to profile the bottom of the cup 60. As shown in FIG. 5, the inner bottom surface 14 and the outer bottom surface 12 of the modified cup 10 and the generally cylindrical inner wall 13 were formed by the extension of the punch ring 33.

After the punch ring 33 is completely extended, the inner slide 31 reverses and the punch ring 33 is retracted. Spring 53 arranged under ring pad 51
Applies an upward load against the ring pad 51 against the punch ring 33, causing the cup 10 to return to the second level of the press. The shoulder 54 and the shoulder 35 coincide with each other to prevent the ring pad 51 from further rising, and the punch ring 33 and the punch core 32 start to rise together. As the punch assembly 30 is retracted, the cup 10 tends to remain on the punch assembly 30. As shown in FIG. 6, pneumatic pressure is provided to separate the cup 10 from the punch assembly 30 by the action of a fluid line 34 located within the punch core 32. In doing so, the fluid line 41 in the press wall 21 operates to create air pressure to push the cup 10 out of the opening 42 in the press wall 21, after which the cup 10 is transferred to the next processing device. Although the present application has been completely described in accordance with the rules set forth in the Patent Act, it can be understood that modifications can be made without departing from the spirit and scope of the invention as set forth in the appended claims.

[Brief description of the drawings]

FIG. 1 is a cross-sectional perspective view of a cup having a modified bottom formed in accordance with the present invention.

FIG. 2 is a partial cross-sectional view of the apparatus according to the present invention showing an initial blanking and drawing process.

FIG. 3 shows an arrangement of an apparatus showing an initial drawing step, similarly to FIG. 2;

FIG. 4 shows the arrangement of the apparatus after the completion of the first drawing step, as in FIG.

FIG. 5 shows an arrangement of the apparatus after a second drawing process is completed.

FIG. 6 illustrates the arrangement of the apparatus after a cup having a modified bottom has been formed in accordance with the method of the present invention.

[Explanation of symbols]

 20 drawing die 21 press wall 22 drawing pad 23 outside slide 24 cutting edge 27 scrap material 28 blank 30 punch assembly 31 inside slide 32 punch core 33 annular punch ring 34 fluid passage 35 shoulder 40 chamber 41 fluid line 42 opening 50 type 50 core 51 ring Pad 53 Spring 54 Shoulder

 ──────────────────────────────────────────────────の Continuation of Front Page (71) Applicant 597062959 2824 Woodaven Avenue, N.W. W. , Canton, Ohio, The United States of America (72) Inventor Terry El Gang, Jr. United States Canton, Ohio United States of America, N.W. Massillon, Ohio, NW, Audubon Street 8277 (72) Inventor Harry Dee Stewart United States of America North Canton, NE, Rolling Ridge 3843 (72) Inventor William J. Simmons Ohio, United States of America Drive, Dunkays Drive, Canton, N. 1730

Claims (15)

[Claims] An apparatus for forming a profiled bottom cup (10) from a single piece of material in a press having a fixed lower platen and a movable upper platen, comprising: a drawing die (20) carried by the lower platen; A punch assembly 30 carried by a platen and having a punch core 32 and an annular punch ring 35, wherein the annular punch ring is disposed coaxially with an outer wall of the punch core and is selectively movable with respect to the punch core. And an inner die core 50 carried by the lower platen.
And a ring pad 51 surrounding the inner mold core and being independently movable with respect to the inner mold core;
The apparatus wherein the punch assembly is movable through the draw mold toward the inner mold core and the ring pad. 2. Apparatus according to claim 1, further comprising:
At least one spring 53 for applying a load on the ring pad in the direction of the annular punch ring,
The device wherein the at least one spring is carried by the lower platen. 3. The apparatus of claim 1 wherein said inner core and said ring pad have an upper surface, said ring pad and said lower platen being a pair of cooperating shoulders.
Wherein the pair of cooperating shoulders prevent the upper surface of the ring pad from rising above the upper surface of the mold core. 4. The apparatus according to claim 1, wherein said annular punch ring and said punch core have a bottom surface and a pair of co-operating shoulders, said pair of co-operating shoulders being said bottom surface of said annular punch ring. A device for preventing the punch core from rising above the bottom surface. 5. The apparatus of claim 1, wherein said punch core has a fluid passage therethrough, said fluid passage being in communication with a source of pressurized air by a selected fluid. apparatus. 6. The apparatus according to claim 1, further comprising:
An apparatus comprising an aperture pad disposed near the aperture mold and selectively movable toward and away from the aperture mold independently of the punch assembly. 7. The apparatus according to claim 6, further comprising a cutting edge located radially outward of said iris pad. 8. The apparatus of claim 1 for forming a modified bottom cup having an outer wall extending upwardly from an outer bottom surface and an inner wall connecting the inner bottom surface and the outer bottom surface. The mold core 32 and the mold core 50 are sized to form the inside bottom surface of the modified bottom cup, and the punch ring 33 and the mold ring pad 51 are sized to form the outside wall and the outside bottom surface of the modified bottom cup. The device that has been determined. 9. A method of forming a profiled bottom cup from a single piece of material in a press having a punch assembly and a drawing die, comprising the steps of: punching a generally circular blank from a sheet of material; Forming a cup having an outer wall and a bottom surface by squeezing the blank against a drawing die with a punch assembly having a punch ring; Profiling the method. 10. The method of claim 9, wherein the step of punching the generally circular blank comprises the steps of: inserting a sheet material into a first level of a press; And feeding a cutting edge through the plate-like material to cut a substantially circular blank from a section of the material. 11. The method of claim 9, wherein the step of punching the generally circular blank is performed at a first level of a press, and further comprising transferring the cup to a second level of the press. Where way. 12. The method according to claim 9, wherein the step of profiling the bottom surface of the cup comprises the steps of bottoming a punch core to the mold core and squeezing the bottom surface of the cup against the mold core. Continuing to feed the punch ring below a second level of the press through the press. 13. The method of claim 12, wherein the punch ring pushes the ring pad against at least one spring when the punch ring is fed past the punch core. 14. The method of claim 13, wherein forming the profiled bottom cup further comprises returning the cup to a second level of the press. 15. The method of claim 14, further comprising the step of discharging the profiled bottom cup from a second level of the press.