US3824829A

US3824829A - Rolling mill with shifting cams for shaping bars

Info

Publication number: US3824829A
Application number: US00366423A
Authority: US
Inventors: J Miller
Original assignee: Individual
Current assignee: Individual
Priority date: 1973-06-04
Filing date: 1973-06-04
Publication date: 1974-07-23
Anticipated expiration: 1991-07-23
Also published as: DE2426453A1; DE2426453B2; GB1423639A; DE2426453C3; JPS5319468B2; FR2279494B1; FR2279494A1; JPS5032062A; CA995933A

Abstract

A roll carriage provided with a vertically movable roll is normally located at one end of a rolling mill housing but is movable back and forth through a passage in the housing. An anvil for supporting a heated bar is movable back and forth through the same passage beneath the roll. Mounted in the housing above the roll is a first cam bar that has a lower surface of a predetermined shape. Beside this cam a similar cam bar is mounted. When a portion of the anvil has moved forward beneath the roll, the carriage also is moved forward until the roll engages both the overlying first cam and the central portion of a heated bar on the anvil, whereupon the roll shapes the trailing end of the bar. Then the cam bars are moved sideways to position the second cam above the roll so that when the carriage and anvil are returned through the housing passage the roll will shape the previously unrolled end of the heated bar.

Description

United States Patent [191 Miller I July 23, 1974 ROLLING MILL WITH SI-IIFTING CAMS FOR SHAPING BARS [75] Inventor: John S. Miller, Poland, Ohio [73] Assignee: Richard P. Krause, New Castle, Pa.

[22] Filed: June 4, 1973 [21] Appl. No.: 366,423

Primary Examiner-Milton S. Mehr Attorney, Agent, or FirmBrown, Murray, Flick &

Peckham [5 7 ABSTRACT A roll carriage provided with a vertically movable roll is normally located at one end of a rolling mill housing but is movable back and forth through a passage in the housing. An anvil for supporting a heated bar is movable back and forth through the same passage beneath the roll. Mounted in the housing above the roll is a first cam bar that has a lower surface of a predetermined shape. Beside this cam a similar cam bar is mounted. When a portion of the anvil has moved forward beneath the roll, the carriage also is moved forward until the roll engages both the overlying first cam and the central portion of a heated bar on the anvil, whereupon the roll shapes the trailing end of the bar. Then the cam bars are moved sideways to position the second cam above the roll so that when the carriage and anvil are returned through the housing passage the roll will shape the previously unrolled end of the heated bar.

9 Claims, 3 Drawing Figures ROLLING MILL WITH SHIFTING CAMS FOR SHAPING BARS In Kruase US. Pat. No. 3,496,749 a rolling mill is shown in which metal bars can be shaped, such as being tapered in thickness toward their opposite ends to provide leaf springs. The mill includes carriages at its opposite ends that can be moved towardthe center of the mill alternately. Each'carriage carries a pair of rolls for shaping the trailing end of a bar as it is carried through the mill on an anvil. The mill shown in that patent operates satisfactory, but it necessarily requires a considerable amount of floor space because the mill housing must be long enough to receive the two carriages.

It is among the objects of this invention to provide a bar shaping mill for shaping both ends of bars, which is much shorter than the one disclosed in the abovementioned patent, which requires only a single roll carriage and which is less expensive to construct and maintain than heretofore.

The preferred embodiment of the invention is illustrated in the accompanying drawings, in which:

FIG. 1 is a plan view, with the top of the mill housing broken away;

FIG. 2 is a side view, with the roll carriage and the bar carriage shown in vertical section; and

FIG 3 is an enlarged fragmentary end view of the mill housing, showing the bar carriage and half of the carriage in vertical section.

Referring to the drawings, a rolling mill housing 1 is provided with a largepassage extending through it from end to end between its four corner columns 2. The housing is very short, being only about one-third the length of the mill housing shown in the abovementioned Krause patent. Extending through the lower part of the housing is a pair of laterally spaced I-beams 3 that project from its opposite ends. Between these beams there is a frame 4 that is mounted on the bottom of the housing passage. A vertically adjustable bed bar 5 is mounted in the top of the frame andprojects above it. I

Disposed in the housing passage and normally projecting from its loading and unloading end is a roll carriage 7 that contains a pair of vertically spaced rolls 8 and 9. The lower roll 9 is supported .by the bed bar 5 with its necks journalled in bearings 10 (FIG. 3)

1 mounted for vertical movement in recesses in the lower part of the carriage. The upper roll is mounted in the same way in the upper part of the carriage and is spaced a considerable distance from the top of the housing passage. Thus, the necks of the upper roll are journalled in bearings 12 vertically movable in carriage recesses at opposite sides of the roll. Bars 13, secured to the tops of these bearings, rest on the tops of coils springs 14 that thereby supportthebearings and normally press the bars up against brackets 15 attached to the carriage. The bracketslimit the distance the roll can be moved upwardly. The upper roll 8 is intended to engage and roll along the lower face of a cam bar 16 mounted above it in the mill housing. The cam bar is shaped to give the desired contour to a heated bar that is to be rolled in the mill. If the heated bar is to be tapered'in thickness toward its opposite ends, the lower surface of the cam bar will be inclined as shown in FIG.

Carriage 7, which is movable lengthwise of the mill housing, is supported and guided by a pair of wheels 20 at each side that travel on horizontal tracks 21 extending through the carriage and outwardly away from the opposite ends of the mill housing. These tracks are supported by short posts 22 mounted on the underlying I- beams 3 and are located about midway between the top and bottom of the carriage.

' Running along the inside of the tracks are two pairs of wheels 24 that support an anvil carriage 25. Means, such as a hydraulic cylinder 26 and piston rod 27, are provided for moving this carriage along the tracks and between the rolls of the roll carriage. The rod end of the cylinder is secured to a cross beam 28 mounted on the outer ends of a pair of box beams 29, the inner ends of which are secured to the two columns of the mill housing at its loading end. The anvil carriage supports an anvil 30 extending lengthwise thereof along its center. A heated bar that is to be rolled can be held on this anvil by any suitable means.

OPERATION In the operation of this mill a heated bar is placed on the anvil while the two carriages are in the positions shown. The anvil carriage 25 then is moved forward by piston rod 27 and between rolls 8 and 9, which at that time are fully separated so that they exert no pressure "on the anvil carriage and its heated bar. As soon as the central portion of the bar has passed the stationary rolls, the roll carriage is moved forward with the anvil carriage by means of a piston rod 32 secured to the carriage and extending out of a fluid pressure cylinder 33 supported on a cross bar 34 between l-beams 3 at one end of the-mill housing. The two carriages then ad- .vance together until cam bar 16 moves upper roll 8 down far enough to frictionally engage the heated bar on anvil 30, with lower roll 9 supporting the anvil carriage. As soon as this happens, the rolls will slow down the forward advance of the roll carriage to about half the speed of the anvil carriage as the downwardly moving upper roll tapers the heated bar toward its rear or trailing end.

It is a feature of this invention that on the return trip of the carriages through the mill housing the previously unrolled end of the bar on the anvil likewise is tapered in the same way by the same rolls. To accomplish this, as shown in FIGS. 1 and 3, a second cam bar 36 disposed in inactive position beside cam bar 16 is moved laterally into operating position over upper roll 8 as the first cam bar is moved laterally away from the roll. This shifting of the cams is done between the completion of the first rolling operation and the beginning of the secondqThe two cam bars are mounted in a frame 37 suspended in the mill housing and movable sideways in it. This frame has flanges 38 projecting from the opposite ends of its top and slidably supported by rails 39 secured to the top of the mill housing passage. The frame is provided with a large downwardly opening recess extending from end to end, the upper wall of which is provided with a pair of parallel dove tail slots extending lengthwise of it. Matching tongues on the top of two adjusting

bars

41 and 42 are supported in these slots. The adjusting bars project from one end of the frame and are provided with adjusting screws 43 engaging the frame so that the bars can be adjusted lengthwise of the frame. The bottom of each of these bars is inclined lengthwise and is provided with a dove tail slot that supports a tongue on top of one of the underlying cam bars. The tops of the cam bars are inclined to fit the adplate 44 secured to 'one end of frame 37 prevents movement of the cams in that direction.

The cam frame 37 can be moved laterally along rails 39 by a hydraulic cylinder 46 supported by the mill housing and containing a piston 47 connected to the frame. In one position of the frame, one of the cam bars is above the upper roll 8 as shown in the drawings and in the other position of the frame the other cam bar is above that roll. Consequently, one end of the heated bar is tapered as the two carriages travel forward through the mill housing, and then the other end of the same bar is tapered as the carriages are moved back through the housing, thecams having been shifted sideways in the meantime. After both ends of the bar have been tapered, the cams are moved back to their first position ready to taper a new bar placed on the anvil.

In addition to requiring a much shorter and therefore cheaper mill housing than heretofore, this invention reduces the time required for rolling each bar because it has to travel such a much shorter distance.

According to the provisions of the patent statutes, I have explained the principle of my invention and have illustrated and described what I now consider to represent its best embodiment. However, I desire to have it understood that, within the scope of the appended claims, the invention may be practiced otherwise than as specifically illustrated and described.

I claim:

1. A rolling mill for shaping bars, comprising a stationary housing provided with a horizontal passage therethrough, a roll carriage normally located at one end of the housing but movable throughsaid passage toward the opposite end, a horizontal roll, means connecting the roll with the carriage for up and down movement therein, an anvil at said one end of the housing adapted to support a heated bar, means for moving the anvil forward into and through said passage beneath said roll and then back through the passage, means for supporting the anvil while beneath the roll, a first cam bar mounted in the housing above the roll and'having a lower surface with a predetermined shape, a second cam bar mounted in the housing beside said first cam bar parallel thereto and likewise having a lower surface with a predetermined shape, means operative when a portion of the anvil has moved forward beneath the roll for moving the carriage forward until the roll frictionally engages both the overlying first cam bar and the central portion of a heated bar on said anvil, whereupon said frictional engagement will cause the roll to advance at about half the speed of the anvil and shape the trailing end of the heated bar, and means for then moving the cam bars laterally to position the second cam bar above said roll before the anvil and carriage are returned through said passage, whereupon the returning anvil and carriage will cause the second cam bar and roll to shape the previously unrolled end of the heated bar.

2. A rolling mill according to claim 1, in which said anvil and carriage moving means include fluid pressure cylinders and pistons.

3. A rolling mill according to claim 1, including means for adjusting said cam bars vertically.

4. A rolling mill according to claim 1, in which the lower surfaces of said cam bars are substantially identical but are reversed relative to each other. 5. A rolling mill according to claim 1, in which the lower surface of one cam bar is. shaped to taper a heated bar from its central'portion toward one end, and the lower surface of the other cam bar is shaped to taper the same heated bar from its central portion toward its opposite end. v

6. A rolling mill according to claim 1, including springs urging said roll upwardly in said carriage, and means limiting the upward movement of the roll.

7. A rolling mill according to claim 1, in which said anvil-supporting means are a second roll journaled in the lower part of said carriage, and a track extending through the housing passage and supported by the housing with said second roll running on the track.

8. A rolling mill according to claim 1, including a frame supporting said cam bars, and means connecting the frame to said housing for movement transversely of said passage, said cam-moving means being connected to said housing and frame.

9. A rolling mill according to claim 1, including a frame supporting said cam bars, and means connecting the frame to said housing for movement transversely of said passage, said cam-moving means being connected to said housing and frame, the lower surface of one of said cam bars being inclined in one direction to taper a heated bar from its central portion toward one end, and the lower surface of the other cam bar being inclined in the opposite direction to taper the same heated bar from its central portion toward its opposite end.

Claims

1. A rolling mill for shaping bars, comprising a stationary housing provided with a horizontal passage therethrough, a roll carriage normally located at one end of the housing but movable through said passage toward the opposite end, a horizontal roll, means connecting the roll with the carriage for up and down movement therein, an anvil at said one end of the housing adapted to support a heated bar, means for moving the anvil forward into and through said passage beneath said roll and then back through the passage, means for supporting the anvil while beneath the roll, a first cam bar mounted in the housing above the roll and having a lower surface with a predetermined shape, a second cam bar mounted in the housing beside said first cam bar parallel thereto and likewise having a lower surface with a predetermined shape, means operative when a portion of the anvil has moved forward beneath the roll for moving the carriage forward until the roll frictionally engages both the overlying first cam bar and the central portion of a heated bar on said anvil, whereupon said frictional engagement will cause the roll to advance at about half the speed of the anvil and shape the trailing end of the heated bar, and means for then moving the cam bars laterally to position the second cam bar above said roll before the anvil and carriage are returned through said passage, whereupon the returning anvil and carriage will cause the second cam bar and roll to shape the previously unrolled end of the heated bar.

4. A rolling mill according to claim 1, in which the lower surfaces of said cam bars are substantially identical but are reversed relative to each other.

5. A rolling mill according to claim 1, in which the lower surface of one cam bar is shaped to taper a heated bar from its central portion toward one end, and the lower surface of the other cam bar is shaped to taper the same heated bar from its central portion toward its opposite end.