Segmented ring guide for rolling mill laying head

Details Segmented ring guide for rolling mill laying head Segmented ring guide for rolling mill laying head

2002-12-06

2004-08-03

Jillions, John M. (Department: 3654)

Winding, tensioning, or guiding

Loop forming

By orbital guide

C072S066000

Reexamination Certificate

active

06769641

ABSTRACT:

BACKGROUND OF DISCUSSION
1. Field of the Invention
This invention relates to high speed rod rolling mills, and is concerned in particular with an improvement to the laying heads employed in such mills to form the hot rolled product into a series of rings.
2. Description of the Prior Art
With reference to
FIG. 1
, a typical laying head includes a housing
10
containing a rotatably driven hollow quill
12
. A three dimensionally curved laying pipe
14
is carried by the quill
12
. The laying pipe has an entry end
14
a
aligned with the rotational axis X of the quill, and a curved intermediate section
14
b
leading to a delivery end
14
c
spaced radially from axis X.
Hot rolled steel rod is delivered to the entry end
14
a
of the delivery pipe along axis X, and exits from the delivery end
14
c
as a helical formation of rings.
Upon exiting from the delivery end
14
c
of the laying pipe, the rings are additionally confined and moved forward by a helical trough
16
surrounded by a cylindrical shroud
18
.
The guide trough
16
is configured and dimensioned to coact with the shroud
18
in providing an axially and radially confined helical extension of the guide path defined by the laying pipe. Although this extended confinement has proven to be highly beneficial in resisting distortion and kinking of the tail ends of products passing through the laying head, the unitary construction of the guide trough has given rise to certain difficulties. For example, the materials that can be readily formed or machined into a helical configuration are relatively soft and thus prone to accelerated wear caused by frictional contact with the hot rolled product. Although accelerated frictional wear typically occurs only locally along short sections of the guide path, the entire trough must be replaced when the affected sections are no longer serviceable. Also, since the dimensions of the guide trough are selected to closely confine a particular product size, a change in the rolling schedule to a different product size will usually require replacing the entire guide trough with another trough properly dimensioned to handle the.
SUMMARY OF THE INVENTION
In accordance with the present invention, the known unitary guide trough is replaced by a plurality of channel-shaped guide sections carried on the periphery of a helical support plate. The guide sections are preferably identical, spaced one from the other, and removably secured to the support plate. With this arrangement, the support plate may be fabricated from one material selected for it strength and formability, e.g., ASTM A502, and the guide sections may be cast or machined from a different material selected for its resistance to frictional wear, e.g., ASTM 4140. Guide sections that undergo accelerated wear can be replaced while allowing the others to remain in place for continued extended use. A change in product size can be readily accommodated by simply changing only the guide sections without having to also replace the helical support plate.
These and other features and advantages of the present invention will now be described in greater detail with reference to the accompanying drawings, wherein:


REFERENCES:
patent: 4074553 (1978-02-01), Woodrow
patent: 4242892 (1981-01-01), Wykes et al.
patent: 5312065 (1994-05-01), Shore et al.
patent: 0 554 976 (1993-08-01), None
patent: 08215751 (1996-08-01), None

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