US2260773A

US2260773A - Means for finishing hot rolled bars

Info

Publication number: US2260773A
Application number: US172294A
Authority: US
Inventors: Oscar U Cook
Original assignee: Individual
Current assignee: Individual
Priority date: 1937-11-01
Filing date: 1937-11-01
Publication date: 1941-10-28
Anticipated expiration: 1958-10-28

Description

Oct. 28, 1941. o." u. cooK 2,260,773

MEANS FOR FINISHING HOT ROLLED BARS Filed Nov. 1, 1937- COOL/N6 g7 ME/l My 75 FLA N/Sfl/NG I fiA/AS'H/IVG ROLLS- INVENTOR.

Q3041? Coo/n BY EM rm ATTORNEYS Patented Oct 28, 1941 UNITED STATES PATENT .oFncE- MEAN S FOR FINISHING HOT ROLLED osmp. Cook, Birmingham, Ala.

1, 1937, Serial No. 172,294 -1 Claim.. (01. 29-43) Application November Figs. 2 and 3 are detail views of dies successively arranged and parted on planes at an angle with one another; Figs. 4 and 5 are enlarged crosssectional views of the bar in different stages of manufacture; Fig. 6 is a section on line 86 of Fig. 1. r

In the conventional method of hot rolling bars, it is difiicult to bring the work to the required diameter and it is necessary to allow considerable By the use of the method and appatolerance. ratus of the present invention hereinafter more fully set forth, the necessary tolerance will be very materially reduced and the finish of the bar will be much smoother and the surface oxide very tight. I

In rolling bars according to my improved method, the stock S is hot rolled between a pair of coactingplanishing rolls l0 and II. Before enside elevation of apparatus 2 sary to provide slight enlargementsindicated at I9 and 20.

In practice, in order to start the bar stock through the dies, it" is necessary that they be opened or slightly separated. Suitable means are provided for automatically closing the dies. The

enlargements l9 and 2|! of the die openings have a tendency to produce fins I and on the bar stock. However, the relative disposition of the dies is such that the fins I! are smoothed out or partly obliterated by the successive die 14. After the bar stock leaves the die l4, it is engaged by a pair of cooperating finishing rolls 2| and 22,

' which have a circular active pass, as indicated in Fig. 6. These finishing rolls draw the bar stock through the dies and through the cooling means. they smooth out and obliterate the longitudinal fin 20 formed by the die I4 and they impart the final finish and desired cross-sectional contour to the bars. While the method and apparatus disclosed is peculiarly well suited forrolling socalled rounds or bars of truly circular crosstering these planishing rolls, the bar is subjected to a scale breaking and scraping operation by engagement with the fixed parts I and 8 and the movable part 9, which jointly constitute a, scale breaker. As the stock enters the planishing rolls i0 and H, the movable part of thescale breaker is brought substantially to the position shown in the drawing, in which it is eifective to bend the entering stock and to break and scrape the scale therefrom.- As the bar stock emerges from the planishing rolls, it enters suitable cooling or controlled atmosphere apparatus, indicated at l2, and during the movement of the section, it will be understood that hot rolled products of other cross-sectional forms can be produced .by providing suitable shaped openings in the dies and by varying the contour of the active passes of the planishing rolls I0 and II, and of the finishing rolls 2 Land 22.

While I have described quite specifically certain steps in the, method and particular apparatus used for the practice of the invention, it is to be understood that various modifications and substitutions of equivalents may be made by those skilled in the art without departure from the in-' ,work through this cooling or controlled atmosphere apparatus the temperature of the bar is so reduced and its condition is so changed as to minimize the forming of oxide and prevent any undue stretching of the stock by subsequent operations. After the bar stock leaves the cooling apparatus l2, it successively engages dies l3 and I4. These dies are parted on lines or planes l5 and i6, which are disposed in staggered relation to one another, these planes preferably being approximately atright angles. The dies l3 and Il are provided with approximately circularv openings l1 and I8.

For practical reasons, where the openings intersect the parting .planes, it is generally necesvention as defined in the appended claim.

What I claim is:' z

An apparatus for producing. bars of predetermined finished cross-sectional shape comprising in combination a pair of coacting rolls through which the bars are adapted to be passed, cooling means positioned to receive the bar as it emerges from said rolls, a plurality of dies arranged in succession and positioned to engage the work as it emerges from the cooling means, each of said dies having an opening therein conforming approximately to the cross-sectional contourof the finished product to be produced, said dies being parted along planes disposed in staggered relation to one another so that the longitudinal fin produced by one die is smoothed down by a succeeding die and a pair of finishing rolls adapted to receive the work as it emerges from said dies, said rolls having an active pass conforming to the desired contour of the bar being rolled.

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