Metal deforming – By deflecting successively-presented portions of work during... – By use of deflector arranged to bend work transversely of...
Patent
1996-04-18
1998-06-09
Crane, Daniel C.
Metal deforming
By deflecting successively-presented portions of work during...
By use of deflector arranged to bend work transversely of...
72 106, 72181, 72249, 72226, B21D 508
Patent
active
057619450
DESCRIPTION:
BRIEF SUMMARY
This application is a 371 of PCT/CA94/00587, filed Oct. 18, 1994.
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to roll forming apparatuses and, more particularly, to an improved quick automated tool changer, or QATC, roll forming apparatus. Soe of the features of the present invention, such as the constant torque motors for driving the rolls, can also be used in tube mills.
2. Description of the Prior Art
In the manufacture of shaped metallic sections, it is well known that whenever a new design, i.e. a new cross-sectional pattern, is to be produced, the operation of the roll forming machine used for manufacturing such shaped metallic sections must come to halt so that the various metal shaping rollers can be dismantled or removed and then replaced by others which define the new desired design. This operation will cause the machine to be out of use for a period which may in some instances extend to three or four days. In addition to being cumbersome and time consuming, the loss of production time resulting from the change over is obviously very costly due to the lack of production during that period.
In the field of metal shaping, the prior art would not seem to suggest an easy way to change over from one set of rolls to another when a new design of shaped metallic sections is required to be produced by the roll forming apparatus. U.S. Pat. No. 3,306,197 issued in February 1967 to Jensen et al. relates to alternative print drums for applying indicia to one surface of a moving sheet or web. These drums are alternatively usable by rotating a common shaft carrying them. U.S. Pat. No. 1,443,164 issued in January 1923 to Bracken on the other hand describes a plurality of marking wheels enabling wheel changes to suit pieces that are to be marked. Other references of interest include U.S. Pat. Nos. 3,400,657 issued in September 1968 to Fulks, 3,730,080 issued in May 1973 to Deligt, 4,286,451 issued September 1981 to Chang, and 4,776,194 issued in October 1988 also to Chang.
Furthermore, some improvements to the technique of roll changing were described in U.S. Pat. No. 4,974,435 issued on Dec. 4, 1990 to Vandenbroucke, wherein there was disclosed a novel roll forming apparatus including a plurality of metal shaping rollers adapted to produce various pre-selected designs and adapted to be rapidly changed over to vary the designs of the metallic shaped sections being produced by the roll forming apparatus. The present invention can be considered as an improvement over Applicant's aforementioned U.S. Patent.
In the production of shaped metallic sections by way of roll forming machines, it is well known to use several forming stations disposed successively one after the other and adapted in such a way that there is a stretching of the metallic sheet being formed from one forming station to the next. To achieve this stretching of the metallic sheets, conventional roll forming apparatuses use forming rolls which get larger at each station, whereby with all rolls rotating at a same angular speed the tangential speed increases from forming stations having rolls of smaller diameter towards forming stations having rolls of larger diameter thereby resulting in a stretching of the metallic sheet. This conventional design of forming stations can result in very large rolls at the last few stations of the roll forming assembly thereby resulting in stations which are cumbersome, costly and which cannot be positioned close to one another.
Furthermore, in view of the forming shapes of the facing rollers of two opposite turrets, the driving engagement of the two forming rollers with the metallic sheet located therebetween is not necessarily centered with respect to the axes of both rollers, whereby the rolls in a same forming station might have to rotate at different angular speeds so that substantially identical tangential speeds are obtained for both forming rollers at the engagement area of the metallic sheet with these forming rollers.
SUMMARY OF THE INVENTION
It is therefore an aim
REFERENCES:
patent: 494904 (1893-04-01), Story
patent: 1443164 (1923-01-01), Bracken
patent: 3306197 (1967-02-01), Jensen et al.
patent: 3318130 (1967-05-01), Sendzimir
patent: 3400657 (1968-09-01), Fulks
patent: 3730080 (1973-05-01), Deligt
patent: 4286451 (1981-09-01), Chang
patent: 4408470 (1983-10-01), Fromont
patent: 4776194 (1988-10-01), Chang
patent: 4876837 (1989-10-01), Kelly et al.
patent: 4974435 (1990-12-01), Vandenbroucke
patent: 5107695 (1992-04-01), Vandenbroucke
patent: 5259228 (1993-11-01), King
patent: 5291108 (1994-03-01), Gerretz
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