US2165266A

US2165266A - Needle roll cold reduction mill

Info

Publication number: US2165266A
Application number: US184645A
Authority: US
Inventors: Edwin B Hudson; Robert S Burns
Original assignee: American Rolling Mill Co
Current assignee: American Rolling Mill Co
Priority date: 1938-01-12
Filing date: 1938-01-12
Publication date: 1939-07-11
Anticipated expiration: 1956-07-11
Also published as: USRE21988E

Description

y E. B. HUDSON ET AL 2,

NEEDLE ROLL COLD REDUCTION MILL Filed Jan. 12, 1938 i i I8 E [6 i 5 I7 15 i W l ':F-\-/\ 30 l J l. I .1 [4- INVESTORS. A [aw/N B. Huaso v BY NDROBERT S. Bumvs.

ATTORNEYs.

Patent d July 11, 1939 Y UNITED STA'FFZ REESSilEfi 'PATENTQGFFIEC'E NEEDLE non. 'com annnc'rron MILL Edwin njnumn and Robert s. Burns, Middletown, Ohio, assignors to The American Boll-v ing Mill Company, Middletown, Ohio, a corporation 'of Ohio Application January 12, 1938, SerialNo. 184,815

1 9 Claims.

This invention relates to cold reduction mills and more particularly to mills having very. small working rolls, sometimes referred to' as needle rolls. Attempts have been made in the past tobuild mills having small working rolls but these attempts have not been entirely. successful, due to horizontal deflection of the workingrolls. When conventional backing rollsare used, it is impossible to stay the small working rolls in a horizontal plane. Another limiting factor, which is encountered particularly in four high mills where the working rolls are driven, is the torque capacity of the roll necks. I

With the above difflculties in mind, it is an chject of our invention to provide a rolling mill construction by means of which we are enabled to use very small working rolls, whereby we are able to attain to a greater degree, the known advantages of small rolls, such as the ability to make high reductions per pass with relatively low screw pressures, whereby, the weight of the machine may be considerably reduced.

It is another object of our invention to provide a rolling 'mill construction in which the working rolls are supported throughout their entire length by means of a half bearing and to retate the working rolls by means of the driving action of the strip.

The last mentioned object oflour invention involves the solution of the problem of relative friction between the roll and the work and'between the roll and its supporting bearing. It is, therefore, another object of our invention to provide a construction in which the'friction between the roll and its supporting bearing is very low in relation to the friction between the roll and the work.

These and other objects of our invention, which 40 will be apparent to one skilled in the art or which will be pointed out more specifically, hereinafter,

we accomplish by that construction, and arrangement of parts and bythat method of which we will now describe an exemplary embodiment.

Reference is now made to the drawing forming a part hereof, and in which:

Figure 1 is a vertical transverse cross sectional view of a mill, according to our invention.

Figure 2 is a cross sectional view of the same,

3 taken on the line 2- -2 of Figure 1.

(o1. su -2.1.1 v

total power for-the reduction of gauge. The mill rolls are preferably driven by the strip. The mill rolls are of very small diameter and are mounted in half-bearings, which bearings are arranged to be reciprocated longitudinally of the rolls to I greatly reduce the friction between the rolls and the bearings without reducing the friction between' the strip and the rolls. Referring more particularly to the drawin we have indicated generally, a mill having housings ill, in which are supported transverse beams I l, which are supported in windows in the housings Ill. The mill Y maybe provided with a conventional screw down including the screws I2, which are shown in contact with the upper transverse beam ll.

The working rolls l3, as most clearly shown in Figure 2, are carried in cast iron bearing members I l, which are provided with semi-cylindrica! bearing grooves for the rolls IS, the bearing members ll supporting the members I 3, throughout their working length. The bearing members I, are carried in reciprocating members IS, in any desired or conventional manner and the members V I5, respectively, ride upon a series of rolls l6, zlgijh are carried between cages I7, and which on the hardened plates It. The hardened lates are supported in the beams H;

The rolls ii, are provided with hemispherical ends I 9, which bear against the cages ll. The working rolls i3, are necked down to a smaller diameter at their ends, 'to take the rubber separating bearings 20, as best seen in Figure 1. At

their ends, the rolls ii, are also made hemispherical so that they may be held against lateral movement by means of the staying plates 2|.

Provision is made for reciprocating the membe'rs it, as follows: Eccentrics- 22, are mounted upon a shaft 23, and are provided with connecting rods 24, one of which is conncted'to each of the members It, in conventional manner as indicated generally at 25. The shaft. 23, maybe provided with a gear 26, which may be driven through any. desired linkage, by one of the coiler motors or, if desired, by separate motor.

It will now be clear that as the shaft 23, is rotated; the bearing carrying members I5, will be caused toreciprocate back and forth, riding on the hardened rolls it, while the working rolls l3, will be held against lateral movement by contact of their ends with the staying plates 2|. In this way, friction between the working rolls and their bearings, is greatly reduced while at the same time, the bearings stay the thin working rolls against deflection in a horizontal plane as well as in a vertical plane. .At the same time, the friction between the working rolls and .the strip 30, is not reduced so that the rolls 13, may be freely driven by the strip.

It will be clear from the above description, that we have provided a mill construction in which working rolls of any desired small size, may be used Without encountering the difliculties enumerated above. It will also be clear that modifications may be made in our invention without includes the steps of supporting the working rolls throughout their operative length, and reciprocating the working roll supports axially of said rolls while pulling strip through said working rolls.

.3. In a rolling mill, a pair of working rolls, supporting bearings for said working rolls, and means for reciprocating said supporting bearings axially of said rolls to reduce friction between said bearings and said rolls.

4. In a rolling mill, 9, pair of working rolls, supporting bearings for said working rolls, said bearings comprising semi-cylindrical grooves in which said working rolls rest and which support said rolls throughout their entire working length, and means for. reciprocating said supporting hearings axially of said rolls to reduce friction between said bearings and said rolls.

5. In a rolling mill, a pair of working rolls, supporting bearings for said working rolls, said bearings, comprising semi-cylindrical grooves in which said working rolls rest and which support said rolls throughout their entire working length, and means for reciprocating said supporting hearings to reduce friction between said bearings and said rolls, said reciprocating means including a driven shaft, eccentrics mounted on said shaft, and connecting rods connecting said ec- 'centrics with said supporting hearings.

6. In a rolling mill, 9. pair of working rolls, supporting bearings for said working rolls, said bearings comprising semi-cylindrical grooves in which said working rolls rest and which support said rolls throughout their entire working length,

.and means for reciprocating said supporting rods connecting said eccentrics with said supporting bearings.

7. In a rolling mill having housings and transverse beams, hardened bearing surfaces mounted in said beams, bearing members mounted for reciprocatory movement in said beams, bearing rollers mounted between said bearing members and said hardened bearing surfaces to carry said bearing members in said reciprocatory movement, said bearing members being provided with semi-cylindrical bearing grooves, and working rolls having their bearing in said grooves and being thereby supported throughout their entire working length.

8. In a rolling mill having housings and transverse beams, hardened bearing surfaces in said beams, a pair of relatively thin working rolls, retaining means for holding said rolls against axial movemenubearing elements for taking the working pressure on said rolls and spacing blocks for maintaining a pass clearance when no stock is between the rolls, said bearing elements having semi-cylindrical grooves to seat said rolls and being mounted for reciprocating movement axially of said rolls, said mounting includingrollers riding between said bearing elements and said hardened bearing surfaces, and means for reciprocating said bearing elements while stock is passing through the mill.

9. In a rolling mill having housings and transverse beams, hardened bearing surfaces in said beams, a pair of relatively thin working rolls, retaining means for holding said rolls against axial movement, bearing elements for taking the working pressure on said rolls, and spacing blocks for maintaining a pass clearance when no stock is between the rolls, said bearing elements having semi-cylindrical grooves to seat said rolls and being mounted for reciprocating movement axially of said rolls, said mounting including rollers riding between said bearing elements and said hardened bearing, surfaces, retaining means for said rollers and means for reciprocating said bearing elements while stock is passing through the mill.

EDWIN B. HUDSON. ROBERT S. BURNS.