Metal deforming – By use of 'flying tool' engaging moving work – With cutting
Patent
1997-03-20
1998-03-03
Larson, Lowell A.
Metal deforming
By use of 'flying tool' engaging moving work
With cutting
72335, B21D 2812
Patent
active
057222800
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The invention relates to a die set for processing a work piece, in two stages in a single die, and in particular to a die set for use in a rotary die apparatus for first of all blanking out an opening, and then forming edge formations in the work piece around the opening.
BACKGROUND ART
In various work piece processing operations, and in particular in the processing of sheet metal, it is frequently desirable to form openings in a work piece, and then to form a variety of formations around the edge of the opening.
In the past, traditional engineering has generally dictated that these two steps be carried out in two separate dies sets. In certain cases progressive dies have been used, in which a series of dies treat the same work piece, and the work piece moves in an intermittent start stop fashion through the progressive dies. In other proposals, a work piece of a predetermined size is inserted into a die. In a first operation the edge of the work piece is trimmed, and then the die descends further and forms the rest of the work piece.
This process is relatively slow however and is unsuitable for many applications.
Still other proposals have been made in which a work piece is punched out of the sheet, and the punched out piece is then worked in the same die. Again this is a relatively slow process.
It is desirable as far as possible to speed up the processing of a metal work piece, thereby reducing its cost.
This is particularly true in the case of a rotary apparatus for processing a work piece on a continuously moving line. Such rotary apparatus is disclosed in U.S. Pat. No. 5,040,397, inventor Ernest R. Bodnar.
In such an apparatus a plurality of die sets are mounted on respective upper and lower die supports on respective upper and lower rollers. The sheet metal work piece passes between the two rollers and is processed by the die sets.
The operation of the dies on the work piece or sheet metal must therefore be carried out at high speeds so that the line can be run at an economical speed.
A typical product manufactured on such a line is shown in U.S. Pat. No. 4,793,113, inventor Ernest R. Bodnar. It will be observed that the products illustrated in the second patent comprise a series of openings formed through a work piece, and flanges formed around the openings. Longitudinal bend formations are formed in the product, but these of course would be formed by conventional roll forming dies.
If old technology single stage dies were used on the rotary apparatus, to make this product, then it was necessary to provide two rotary stations, the first to form the openings and the second to form the edge flanges. In practice, since the openings in the product of U.S. Pat. No. 4,793,113 were relatively close together it was necessary to have four such rotary stations.
This involved extra expense and also involved the necessity to carefully register the locations of the dies relative to one another by spacing the rotary units precisely, so as to ensure that the second die, forming the edge registered precisely with the opening formed by the first die.
While this was entirely feasible and was in fact done with some degree of commercial success, it was an expensive solution to the problem.
Japanese Patent No. 60-166125 discloses a burring method of ceiling board of container.
According to this method, a ceiling board is placed on a lower die and an upper die is lowered. A pressing projection at a lower end of the upper die presses the ceiling board, and the inside of the board is pushed up by a die. A bulged part is formed on the ceiling board. The upper die is further lowered, and a circular hole is pierced in the bulged part. The die goes into a gap in the upper die, and a flange fixing part is formed.
However, there is no disclosure of an ejector and a passage way in the die set in this Japanese Patent for ejecting blanked out portions of work pieces.
Furthermore, there is no disclosure of a two stage die set for use in combination with a rotary apparatus for high speed continuous blanking, punc
REFERENCES:
patent: 3146749 (1964-09-01), Heinle
patent: 3222968 (1965-12-01), Larson
patent: 3943745 (1976-03-01), Paul
patent: 4956989 (1990-09-01), Nakajima
patent: 5040397 (1991-08-01), Bodnar
patent: 5075951 (1991-12-01), Schurr et al.
Gealow Jon Carl
Larson Lowell A.
LandOfFree
Two stage die set does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Two stage die set, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Two stage die set will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-2239611