Rolling method using rolling guide

Details Rolling method using rolling guide Rolling method using rolling guide

1999-12-30

2001-05-08

Butler, Rodney A. (Department: 3725)

Metal deforming

By use of roller or roller-like tool-element

With handling of, or guiding of, work or product relative to...

Reexamination Certificate

active

06227025

ABSTRACT:

BACKGROUND OF THE INVENTION
1. Field of the Invention
This invention relates to a method for rolling a material while guiding the whole of the rolled material from its leading end to its tail end to a caliber of rolling rolls by use of a roller guide disposed in a train of rolling mills for continuously rolling the material into section steel, bar steel, wire rod or the like.
2. Description of the Prior Art
There have been so far proposed rolling methods for increasing the accuracy of the outside size of a rolled material by providing a roller guide with a sensor or the like, as described hereinafter.
The rolling method using a roller entry guide disclosed in U.S. Pat. No. 4,790,164 adopts measuring means such as a pressure sensor to measure the stress of guide rollers suffered from the rolled material. In the conventional rolling method, the force of the rolled material exerted to the guide rollers is maintained constant on the basis of the results obtained from the measurement in order to compensate wear on the guide rollers and the front-stage rolling roll, and the axis of the roller entry guide is exactly aligned with a pass line to achieve high accuracy of the outside size of the rolled material.
There is disposed a pass line adjusting method for entry guide in Japanese Patent Application Publication No. HEI 07-275916(A). In this conventional method, after guiding a rolled material to a rolling mill by use of a roller guide disposed at the entrance of the rolling mill, the outside size of the stock rolled by the rolling mill is measured at the exit of the rolling mill to detect the dislocation of the roller guide relative to the pass line from the measured results, so that the axis of the roller entry guide is exactly aligned with a pass line to achieve the accuracy of the outside size of the rolled material.
The former rolling method described above makes it possible to ascertain whether the rolled material embraced by the guide rollers becomes thicker or thinner compared with a material having a standard outside size on the basis of values detected from sensors disposed on either side of the guide rollers for detecting the force of the rolled material exerted on the guide rollers. However, this conventional method involves a problem to be solved such that the gap between the guide rollers and embracing force of the guide rollers cannot be changed with a material to be rolled during a rolling process. Consequently, this conventional method entails such a disadvantage that the gap between the guide rollers cannot be finely adjusted even when it is slightly wide or narrow and required to be adjusted.
The latter rolling method enables the alignment of the roller guide with the pass line to be effected so as to bring the shape of the rolled material close to the desired shape while measuring the outside size of the roller material. This conventional method should be improved so as to produce a rolled material with high dimensional accuracy by regulating the gap between the guide rollers and embracing force of the guide rollers.
OBJECT OF THE INVENTION
An object of the present invention is to provide a rolling method capable of producing a rolled material having high dimensional accuracy.
Another object of the present invention is to provide a rolling method using a roller guide for effectively guiding a material rolled by rolling rolls in a front-stage rolling mill to a post-stage rolling mill.
Still another object of the present invention is to provide a rolling method adopting a roller guide incorporating guide rollers capable of changing a gap by a driving cylinder.
SUMMARY OF THE INVENTION
To attain the object described above according to the present invention, there is provided a rolling method using a roller guide having guide rollers for guiding a rolled materials rolled by rolling rolls of a front-stage rolling mill to a post-stage rolling mill. A gap between the guide rollers are controlled by a driving cylinder so as to satisfy Rp1=Rp, wherein Rp is a standard, under a condition [1] mentioned below, and allow Pf to approach S to obtain a finally objective value Pf=S when performing a rolling process for a rolled material under a condition [2] mentioned below:
Condition [1]: S>Pf and Rp1>Rp
Condition [2]: Satisfying either or both of the following corrective rolling conditions (1) and (2) to change the roll gap between the guide rollers:
Corrective Rolling Condition (1): G11<G1
(decrease a roll gap between front-stage rolling rolls to change from G1 to G11), and
Corrective Rolling Condition (2): G21>G2
(increase a roll gap between post-stage rolling rolls to change from G2 to G21),
wherein, Rg is a gap between the guide rollers, which is determined to a standard outside size of a material to be rolled by the front-stage rolling rolls,
Rg1 is a gap between the guide rollers during guiding the rolled material in rolling,
Rp is a standard embracing force produced by the guide rollers in permitting the rolled material having a standard outside size to pass through between the guide rollers with a gap defined for the gap Rg,
Rp1 is an embracing force produced by the guide rollers in guiding the rolled material by the guide rollers with the gap Rg1 in the rolling process,
G1 is a current roll gap between rolling rolls in a front-stage rolling mill,
G11 is a roll gap changed from the roll gap G1,
G2 is a current roll gap between the rolling rolls in a post-stage rolling mill,
G21 is a roll gap changed from the roll gap G2,
Pf is an outside size of the material rolled by the post-stage rolling mill, which is measured by use of measuring means such as a profile meter disposed on the downstream side of the post-stage rolling mill, and
S is an outside size of a desired rolled material.
Other and further objects of this invention will become obvious upon an understanding of the illustrative embodiments about to be described or will be indicated in the appended claims, and various advantages not referred to herein will occur to one skilled in the art upon employment of the invention in practice.


REFERENCES:
patent: 3765214 (1973-10-01), Boehmer
patent: 4039107 (1977-08-01), Boley
patent: 4073173 (1978-02-01), Marshall et al.
patent: 4123927 (1978-11-01), Brauer
patent: 4215558 (1980-08-01), Shiguma et al.
patent: 4400963 (1983-08-01), Epps
patent: 4470285 (1984-09-01), Cattaneo et al.
patent: 4680953 (1987-07-01), Fabris
patent: 4790164 (1988-12-01), Rothe
patent: 7-275916 (1995-10-01), None
patent: 10-180337 (1998-07-01), None

Affiliated with

Also associated with

Rating

Rolling method using rolling guide does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Rolling method using rolling guide, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Rolling method using rolling guide will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-2481972