US 4,141,071 AGranted

Automatic diametric dimension control for mill for rolling round bars

AssigneeBethlehem Steel Corporation

InventorsRonald W. Yerkes, Richard S. Hostetter, Jr., Vinko Primorac

Life of this patent

Estimating the term…

Loading patent…

Abstract

A mill for rolling round bars, having a penultimate and a last stand with mutually perpendicular roll axes, is provided with a control system for varying the roll gaps of said stands and for axially aligning the rolls in the last stand. A gauge measures the diameters of the bar about its entire periphery and supplies a computer with this data. In addition, data, indicative of lengthwise variations in predetermined diameters of the bar, are supplied to the computer. The computer uses these data to compute an optimum diameter profile of the bar. The computer then calculates adjustments to the rolls in these last two stands to obtain this optimum profile. If substantial improvement in the performance of the mill can be obtained by these adjustments, the computer actuates means for adjusting these rolls whereby this profile may be realized.

Claims13

Dependent claims

In a bar mill comprising a penultimate and a last reducing stand, the axes of the rolls of one of said stands being perpendicular to the axes of the rolls of the other of said stands, and means for maintaining said bar in a state of substantially nonvarying tension as it enters and leaves said stands, a system for optimizing the diametric size of said bar within predetermined limits, comprising:

(a) sensor means for detecting at least one diametric dimensions of a bar leaving said last stand, comprising:
(i) means for producing at least one diameter signal each indicative of a different diameter of said bar;
and
(ii) means for causing said means (i) to scan the bar periphery in response to a scanning control signal, said means (ii) producing a scanner position signal;
(b) programmed computer means for:
(i) producing said scanning control signal;
(ii) receiving each said diameter signal, and said scanner position signal;
(iii) receiving the aim diameter of the bar, roll position signals, and any data fed from an operating source and needed for compensating at least one diameter signal received;
(iv) producing and storing a sequence of data representative of the diameter profile of said bar;
and
(v) computing and outputting at least one adjustment signal for the rolls in said stands as required to optimize said diametric size;
and
(c) means responsive to at least one adjustment signal for performing at least one roll adjustment.

10 more elements

In a bar mill comprising a penultimate and a last reducing stand, the axes of the rolls of one of said stands being perpendicular to the axes of the rolls of the other of said stands, and means for maintaining said bar in a state of substantially nonvarying tension as it enters and leaves said stands, a machine method of optimizing the diametric size of the bar within predetermined lines, comprising:

(a) detecting at least one diametric dimension during scanning about the periphery of the bar leaving said least stand, thereby producing at least one diameter signal and a scanner position signal;
(b) producing and storing data in computer means representative of the diameter profile of said bar based on at least one said diameter signal and said scanner postition signal;
(c) computing and outputting at least one adjustment signal for the rolls in said stands as required to optimize said diametric size;
and
(d) performing at least one said roll adjustment in response to at least one adjustment signal.

2 more elements

Dependencies are inferred from the claim text.