Metal deforming – With use of control means energized in response to activator... – Metal deforming by use of roller or roller-like tool element
Reexamination Certificate
2000-06-19
2001-07-03
Crane, Daniel C. (Department: 3725)
Metal deforming
With use of control means energized in response to activator...
Metal deforming by use of roller or roller-like tool element
C072S008400, C072S037000, C072S164000
Reexamination Certificate
active
06253587
ABSTRACT:
This application is a 371 of PCT/EP98/05923, published on Apr. 1, 1999, as WO 99/15929.
The invention relates to regulating a compressing device a corresponding method.
During the manufacture of metal tubing that contains light wave guides, an excessive length must be set in the metal tubing for the light wave guides. There are various methods for this purpose. One of the methods, which is used either alone or in combination with other methods, involves transporting metal tubing with light wave guides through a roll straightening passage. During transport, the metal tubing is bent by wrapping around a roller, and then bent back to the same degree. This shortens or compresses the metal tubing to an extent depending on the diameter of the metal tubing, the diameter of the roll straightening passage rollers, and the angle of wrap of the rollers (Internat. Wire & Cable Symp. Proceedings 1990, pp. 37-43). The compression lies in a length range (several per thousand) that corresponds to the excessive length desired for the light wave guide(s).
The object of the invention is to indicate a compressing device for metal tubing in which the excessive length of the light wave guides is easy to monitor and regulate.
Regulating the compressing device and corresponding compressing method according to the invention enables an improvement in quality, since the excessive length can be numerically preset, and the setpoint is automatically converted by the device or method. In addition, direct on-site production monitoring is possible.
As a rule, a roll straightening passage has a number of fixed rollers and a number of adjustable rollers, which can be moved into the gaps between the first rollers. However, use can also be made of roll straightening passages in which each roller moves in the feeding device (immersion depth between neighboring rollers). The angle of wrap, and hence the level of elastic and permanent plastic deformation, depend on the diameter of the rollers, immersion depth and distance between the adjacent rollers. A suitable roll straightening passage can consist of two rollers, but preferably out of a odd number of rollers (at least three). In the latter case, there is a symmetrical arrangement in which the forces attack symmetrically. Use can also be made of roll straightening passages in which the rollers vary in diameter, e.g., alternate between large and small.
The shortening effect stems from plastic deformation, which increases the wall thickness of the metal tubing. The reduction in length of the tubing is transformed into a thickening of the wall. Due to the reduction in length, the tubing exiting the roll straightening passage has a slightly, but measurably lower velocity than at the entry side of the roll straightening passage. This velocity difference is to be used for the quantitative regulation of shortening.
The essence of the device is that a measuring device for determining the velocity of the metal tubing (preferably special steel) is arranged in front of and behind each roll straightening passage, wherein the measuring device can determine the difference in velocity in front of and behind the roll straightening passage, and the feeding device can be adjusted depending on the difference in velocity.
The measuring device preferably measures without contact. To this end, electrical or optical methods are possible. One elegant method is optical velocity measurement, while other methods can be based on the radar principle (microwave measurement).
The metal tubing passes through the roll straightening passage in one plane. It has proven advantageous to arrange two roll straightening passages one after the other, wherein one is arranged perpendicular relative to the other. The rollers of the straightening passage have a circular (hollow) profile that corresponds to the outside diameter of the metal tubing. However, since the metal tubing becomes deformed, it has proven favorable for the rollers in the roll straightening passage to exhibit an oval profile, and for the small axis of the oval (ellipse) to lie parallel to the roller axis.
Proposed in addition to the device is a method for compressing a metal tubing with at least one inner-lying light wave guide using a roll straightening passage comprising a feeding device of the rollers with regard to the angle of wrap, wherein the metal tubing is unwound by a feed roller in front of the roll straightening passage, and is wound on a delivery roller after the roll straightening passage. In this case, the velocity of the metal tubing is measured in front of and behind the roll straightening passage, the difference in velocity in front of and behind the roll straightening passage is determined from the measurement, and the difference in velocity is used as a manipulated variable for the feeding device. The manipulated variables can be relayed to motors that twist the setscrews of the roll straightening passage.
The feeding device is preferably controlled automatically by the manipulated variable (velocity difference).
The method can preferably be refined in such a way that the drives of the feed roller and delivery roller are regulated as a function of the difference in velocity. This means that, proceeding from a synchronous velocity of the feed and delivery roller, a small difference in velocity is factored in, which fluctuates within a range of several per thousand. To this end, the feed roller could also be decelerated relative to the delivery roller.
REFERENCES:
patent: 4768363 (1988-09-01), Yamashita
patent: 5653022 (1997-08-01), Logic
patent: 6061905 (2000-05-01), Logic
patent: 33 23 623 (1983-06-01), None
patent: 41 37 459 (1991-11-01), None
Graning Herward
Nolden Wolfgang
Crane Daniel C.
Harness & Dickey & Pierce P.L.C.
NKT Cables GmbH
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