Winding – tensioning – or guiding – Loop forming – By rotatably driven loop collector
Reexamination Certificate
1999-11-02
2001-11-20
Mansen, Michael R. (Department: 3653)
Winding, tensioning, or guiding
Loop forming
By rotatably driven loop collector
C242S472500, C242S476100
Reexamination Certificate
active
06318660
ABSTRACT:
FIELD OF THE INVENTION
This invention concerns a coiling machine for rolled stock, particularly bars, plate, or rods (smooth or ribbed) of hot-rolled metal material, with a cross-section either round, square, rectangular, hexagonal or otherwise.
To be more exact, the invention concerns a coiling machine located downstream of a traditional rolling train, equipped with drawing rollers and shears, wherein the rolled stock is wound into spirals to form coils which are subsequently tied to be stored or moved.
BACKGROUND OF THE INVENTION
Coiling machines which are known to the state of the art are substantially divided into two categories, according to whether the axis of rotation of the mandrel or reel is vertical or horizontal.
Coiling machines with a vertical axis of rotation are based mainly on coiling inside containing cylinders, where the spirals are formed with the help of spiral-forming tools equipped with relative motion with respect to the containing cylinder.
This type of coiling machine generally does not ensure that a compact coil is formed, since the reciprocal movement of the spiral-forming tool and the containing cylinder is quite uncontrolled and since the stock which is being coiled is not subjected to a controlled tension.
Coiling machines with a horizontal axis of rotation normally allow to obtain much more compact coils, since the product to be coiled is wound on the central mandrel, which is made to rotate by a motor organ. In such coiling machines, the coil is made by means of successive, superimposed rings or layers, which are coaxial to the reel, and thus compact coils are obtained.
The state of the art includes a coiling machine wherein a curved element is arranged inside a containing cylinder, in which the spirals are formed and accumulate, and is kept substantially parallel to the inner surface of the containing cylinder.
In this coiling machine, while the containing cylinder is made to rotate, the curved element is made to gradually advance, parallel to the axis of rotation of the cylinder, and is removed from inside the coil when the latter has been completed.
Although this coiling machine is equipped with a device which facilitates the formation of the spirals of the coil, it does not ensure that a compact coil is formed, since the reciprocal movement of the spiral-forming tool and the containing cylinder is quite uncontrolled and since the stock which is being coiled is not subjected to a controlled tension.
The state of the art also includes a coiling machine located at the end of a rolling plant for the continuous production of iron bars, wire or round pieces, wherein a single plane product, obtained during a first rolling step, is sub-divided into a plurality of profiles which are given the desired shape in subsequent rolling operations. In this plant the rolled products thus obtained are conveyed, parallel to each other, towards the stationary coiling machine with a horizontal axis of rotation, which provides to coil them simultaneously, or in parallel, so as to form a plurality of coils on the same mandrel.
This coiling machine has the disadvantage that several profiles, which may even be different from each other, are wound onto the same mandrel, rotating at a set angular velocity, and therefore the coil formed is neither compact nor in the least controlled while it is being formed.
Moreover, coiling machines which are known to the state of the art do not guarantee a uniform temperature over the whole stock which has been rolled and coiled, with differences at the leading and trailing end and the centre; this gives a lack of uniformity of the metallurgical aspect over the whole coil of rolled stock.
The present applicant has designed, tested and embodied this invention to overcome the shortcomings of the state of the art and to obtain further advantages.
SUMMARY OF THE INVENTION
The coiling machine according to this invention is set forth and characterised in the main claim, while the dependent claims describe other characteristics of the main embodiment.
The main purpose of the invention is to achieve a precision coiling machine, that is to say of the type in which the individual spirals are formed under the guidance of mechanical means which regulate their packing, their density and their tension, and wherein it is very easy and quick to remove the coil of rolled stock as soon as it has been formed.
In accordance with this purpose, the coiling machine according to the invention comprises a mandrel mounted rotatable and cantilevered, around its axis of rotation, on a stationary structure; the mandrel comprises an inner wall orthogonal to the axis of rotation and has an outer end with which a cylindrical plate is suitable to cooperate selectively; the latter is movable from a working position, wherein it is arranged substantially orthogonal to the axis of rotation so as to define a lateral wall parallel to the inner wall, so as to allow the coil of rolled stock to form, and an inactive position, wherein it is distanced and lowered with respect to the mandrel so as to allow the coil of rolled stock to be axially removed.
The coiling machine according to the invention is suitable to coil hot rolled stock of any type, such as bars, plate, or rods (smooth or ribbed) of metallic material, such as low, medium or high carbon steels, stainless steels, alloys or otherwise, with a cross section which may be round, square, rectangular, hexagonal or otherwise, with diameters of between 8 and 52 mm or, in the case of bars or plate, with a section of between 60 mm
2
( for example 20 mm by 3 mm) and 1400 mm
2
(for example 70 mm by 20 mm).
It is thus possible to coil rolled stock travelling at speeds of up to 40 meters per second and more, with a very high hourly production, in the order of about 100-110 tonnes per hour.
Another purpose of the invention is to provide a coiling machine which will facilitate the formation of the first spirals of rolled stock to be coiled around the reel.
Another purpose of the invention is to achieve a coiling machine wherein, for each coiling machine, means are provided to maintain the coil uniformly compact, so as to guarantee uniformity of temperature and of metallurgical features over the whole rolled and coiled stock, without appreciable differences between the leading end, the centre, and the trailing end thereof.
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Bordignon Giuseppe
De Luca Andrea
Poloni Alfredo
Danieli & C. Officine Meccaniche SpA
Mansen Michael R.
Stevens Davis Miller & Mosher LLP
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