Metal deforming – By use of 'flying tool' engaging moving work – Including orbitally-moving tool-face
Patent
1995-03-15
1998-08-11
Larson, Lowell A.
Metal deforming
By use of 'flying tool' engaging moving work
Including orbitally-moving tool-face
72465, 72190, B21B 2100, B21B 2500
Patent
active
057911851
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The invention relates to rotary apparatus for performing a variety of functions on a moving workpiece. The workpiece may be a continuous strip, or may be a series of separate strips, which move continuously through the rotary apparatus. The material in many cases will be strip steel, but the invention is of much wider application.
BACKGROUND ART
Rotary apparatus for performing a variety of functions on continuous strip material such as strip steel, have been proposed over the last at least fifty years. However, a need has remained for a rotary apparatus to satisfactorily perform precise functions on a moving strip. There are necessarily upper and lower rotary devices which register with one another and they carry respective upper and lower rotary dies. It is well known in all die forming operations that the two dies must register precisely with one another on opposite sides of the workpiece before they close. It is for this that most of the earlier proposals have not been successful. No way was known to achieve a satisfactory form of precise registration of each pair of dies.
However, in U.S. Pat. No. 5,040,397 of Ernest R. Bodnar, Rotary Apparatus granted Aug. 20, 1991, there is shown a form of rotary apparatus, in which upper and lower rotary devices carried semi-rotary die carriers. The die carriers were themselves guided by guide pins. The guide pins rode in cam tracks. The guide pins were located in pairs, one at each end, of each of the semi-rotary devices, and the guide cams were located at opposite ends of the rotary devices.
By offsetting one of the guide pins at one end relative to the guide pin at the other end, and also by precisely profiling the guide cams at each end of each of the rotary devices, it was possible to bring the semi-rotary die supports into precise registration just prior to closing, and during closing, and just after closing on the workpiece. This proposal has proved to be satisfactory for many applications. An improvement to the above described apparatus of U.S. Pat. No. 5,040,397 is described in Canadian Patent Application No. 2,066,803. In that patent application, the inventor, Ernest R. Bodnar, describes the provision of guide pins on each of the semi-rotary die supports. By offsetting respective forward and rearward guide pins on respective guide supports, and by providing two separate guide cams at each end of the rotary apparatus, it then became possible to provide for all four pins to engage respective guide cams just prior to closing, during closing, and just after closing. This proposal may produce a much improved degree of registration between the respective dies carried on the die support. This is particularly important in heavier duty applications, or in applications where the line speed was desired to be increased. Even in this system however there were limitations. For example, it will be understood from a simple geometrical analysis that whereas two dies may register with one another just prior to closing, and during closing and after closing, they are in fact traversing arcs of a circle, as the rotary supports rotate.
This means that the linear speed of the die was greatest at the point where the two dies closed, and was somewhat reduced just prior to closing and just after closing.
On the other hand, since the dies are required to perform operations on a flat workpiece, whether a continuous strip, or discontinuous strip pieces, it will be apparent that there is a very slight degree of "mismatch" in speed of forward movement as between the pair of dies, and the workpiece between them just before closing and just after closing. Precise speed matching is achieved only at the point where the dies are fully closed on the workpiece and the planes of the two dies are precisely tangential to each other.
In operations where relatively thin workpieces were being treated, or where relatively shallow formations were being formed, this slight degree of mismatch in speed did not produce any serious consequences. However, it is desirable to apply this te
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patent: 4621511 (1986-11-01), Knudson
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patent: 5040397 (1991-08-01), Bodnar
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Butler Rodney
Gealow Jon Carl
Larson Lowell A.
Rotary Press Systems Inc.
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