US3665746A

US3665746A - Combination rolling mill

Info

Publication number: US3665746A
Application number: US15326A
Authority: US
Inventors: Werner W Eibe
Original assignee: Blaw Knox Co
Current assignee: Blaw Knox Co; Italimpianti of America Inc
Priority date: 1970-03-02
Filing date: 1970-03-02
Publication date: 1972-05-30
Anticipated expiration: 1989-05-30
Also published as: GB1325111A; US3712102A; CA949362A

Abstract

A cartridge loadable combination mill for rolling beam, structural or plate products. The combination mill includes a pair of cartridge or cartridge-like loaded mill stands, the first of which has a movable mill housing and the second of which is adaptable to being moved out of the mill line. The cartridges contain a pair of horizontal and vertical rolls that are aligned and adjusted prior to insertion into the mill stands through the mill housing windows. A four station cartridge transfer means having alternative stations simultaneously alignable with both mill stand windows is provided for supporting, positioning, and transferring work roll cartridges to the mill stands for insertion therein. A pair of movable table rolls with side guards adjustable to the maximum width of the first mill stand are movable either along the mill line or out of said line.

Description

United States Patent Eibe [54] COMBINATION ROLLING NIILL Werner W. Elbe, McCandless Township, Allegheny County, Pa.

[72] Inventor:

[52] US. Cl ..72/239 [51] Int. Cl ..B21b 31/08 [58] Field of Search ..72/237, 238,239, 248, 41, 72/42, 43, 44, 201

[56] References Cited UNITED STATES PATENTS 3,212,314 10/1965 Sieger ..72/239 3,136,182 6/1964 Wegmann et al ..72/238 3,316,746 5/1967 Kocks et a1. 72/238 1,936,582 11/1933 Clapp et a1 ..72/42 1,988,679 1/1935 Badlam 72/201 3,142,208 7/1964 Properzi .72/41 3,190,099 6/1965 Sieger et al.'..... 72/238 3,221,530 12/1965 Swallow et al. .72/238 3 ,525,244 8/1970 Bohenkamp ..72/238 51 May 30, 1972 OTHER PUBLICATIONS Combination Mill & Structural Mill" (pamphlet distributed at 1968 AISE convention in Cleveland, Ohio) Photographs of Combination Mill & Structural Mill which were displayed at the 1968 AISE convention.

Primafy ExaminerMilton S. Mehr Attorney-Buell, Blenko & Ziesenheim 571 ABSTRACT A cartridge loadable combination mill for rolling beam, structural or plate products. The combination mill includes a pair of cartridge or cartridge-like loaded mill stands, the first of which has a movable mill housing and the second of which is adaptable to being moved out of the mill line. The cartridges contain a pair of horizontal and vertical rolls that are aligned and adjusted prior to insertion into the mill stands through the 16 Claims, 37 Drawing Figures Patented May 30-, 1972 16 Sheets-Sheet 1 16 Sheets-Sheet 2 Patented May 30, 1912 3,665,745

16 Sheets-Sheet 5 Fig. 6

Patented May 30, 1972 3,665,746

' 1s Sheets-Sheet 4.

Patented May 30, 1972 3,665,746

16 Sheets-Sheet 5 Patented May 30, 1972 16 Sheets-Sheet 6 Fig. /0

' Patented May 30,1972

16 Sheets-Sheet 7 Patented May 30, 1912 y 3,665,746

16 Sheets-Sheet 8 Fig. /3 77 Patented May 30, 1972 16 Sheets-Sheet 9 I I l- I I I! i I N: mm

Patented May 30', 1972 16 Sheets-Sheet 10 mm mm III- II IIIJAQI'I.

llll III Patented May 30., 1912 3,665,746

16 Sheets-Sheet 11 /""3 2 7 I07 93 x g r' 9 j Pat ented May 30, 1912 3,665,746

16 Sheets-Sheet l2 Patented May 30, 1972 16 Sheets-Sheet 15 Patented May 30, 1972 3,665,746 1 16 Sheets-Sheet 1L Patented May 30, 1972 I 16 Sheets-Sheet 15 Patented May 30', 1972 3,665,746

16 Sheets-Sheot 16 COMBINATION ROLLING MILL My invention relates to a new combination mill and, in particular, a cartridge loadable combination mill for rolling beams, structurals, or plates.

For a mill to provide a diversity of rolled products, it has been customary to convert a particular mill line from one product to another by changing either the mill stands as well as the work rolls contained therein or by providing means that make the mill adaptable to hold various different product work rolls. As an alternative to a convertible mill line, various product mill lines can be provided. However, both methods of providing a diversity of rolled products have disadvantages. In changing a line from one rolled product to another, losses in production and man hours are caused by the down time or inoperability of the mill during the conversion. To have a number of product lines requires an initially high capital outlay but overcomes the serious problem of down time losses.

I provide an improved solution to the problem of rolled product diversification without the high initial cost required for a number of product lines and without high down time requirements to convert a single mill line. I provide a cartridge loadable combination mill that is adaptable to rolling beams, structurals, or plates without costly conversion down time and with a minimum of labor required. Not only does my mill substantially reduce conversion down time, but my novel cartridge and mill arrangement reduces the work roll cost by certain size reductions in the work rolls and by the elimination of strains and undue work loads placed upon the rolls. My combination mill is adaptable to being converted automatically from one product to another in approximately 75 percent less time than is now ordinarily possible.

l provide a combination rolling mill line comprising a pair of mill stands. In rolling beams, for example, one of the stands is a universal-type mill stand and the other is an edging-type mill stand. In rolling structural products, the edging mill stand is movable out of the mill line towards the drive side; the spindles for the edging mill are positioned through the drive window to rest within the stand after the'cartridge' is removed. Both stands are cartridge or cartridge-like loaded with a universal-type cartridge containing a pair of horizontal and vertical rolls and the cartridge-like assembly containing a pair of horizontal rolls. In the production of both structural and plate products, the universal mill stand is loaded with a cartridge-like assembly for holding the twohigh horizontal structural and plate rolls. Production of a plate product involves the use of a universal-type cartridge in the edging mill stand as edging and pinch rolls. The universal mill stand incorporates a movable housing on the operator's side of the mill line which is positionable at preselected settings conforming to various widths of the product to be rolled. The movable housing is securely retained on the shoe plates by means of a toggle operated clamping mechanism.

The universal-cartridge and cartridge-like assemblies are supported and aligned with respect to the mill prior to insertion into the stands by means of a four station transfer table which is movable on a line parallel to the mill line. Alternative stations of the transfer table are simultaneously alignable with the mill housings for simultaneous extraction and insertion of the cartridges into and out of their respective stands. The cartridge assemblies ride on guideways that extend from the transfer means to and into the mill stands. The universal stands guideway permits unrestricted movement of the movable housing, and the edging mill has a guideway supported between the mill housings and movable therewith. The cartridges are pushed into the mill stands from the transfer table by means of hydraulic cylinders. Great time savings are accomplished in part because the cartridges are preassembled in the work roll shop or set up area prior to conversion of the mill line and are positioned on the transfer means in a nonaligned position to await alignment after ejection of an existing cartridge or cartridge-like assembly from the mill. The cartridges have one discrete position within the mill and are secured therein by means of hydraulic cylinders.

I provide table rolls that have a width equal to the maximum width of the universal stand to accommodate all sizes of rolled products. At least two of the table roll assemblies are positioned behind the edging mill stand and are movable. One of the table roll assemblies is movable along the mill line to occupy the space left when the edging mill'is moved out of the line during the production of structural products; the other one is movable into and out of the mill line to occupy the space vacated by the first table roll assembly. I

Since the work roll cartridges are preassembled and adjusted prior to conversion and since their actual movement into and out of the mill stands requires very little time, the actual conversion from one rolled product to another is extremely short and a minimum down time is required. Further advantages and features of my invention will become apparent from a perusal of the following description of a presently preferred embodiment of my invention taken in connection with the accompanying drawings of which:

FIG. 1 is a diagrammatic plan view of my combination mill in position to convert from a beam to a plate product;

FIGS. 2-4 are partial sequential block diagrams of the conversion steps from a beam to a plate product;

FIG. 5 is a block diagram of one of the conversion steps from a beam or plate product to a structural product;

FIG. 6 is an isometric view of my mill in beam rolling position with a structural cartridge-like assembly prior to or after conversion;

FIG. 7 is a side elevation in partial section from the operators side of my mill in plate rolling position;

FIG. 8 is a plan view of the mill shown in FIG. 7;

FIG. 9 is a side elevation in partial section of the movable housing of the first mill stand with a cartridge;

FIG. l0'is front elevation of the cartridge loaded first mill stand;

FIG. 11 is a plan view in partial section of the screw-down assembly of the first mill stand;

FIG. 12 is a section of the screw-down taken along line XII-XII of FIG. 11;

FIG. 13 is a side elevation and partial section of the balancing cylinder, hanging rods and notched bar of the first mill stand;

FIG. 14 is a sectional elevation of the cartridge wheel assembly;

FIG. 15 is a front side cut-away elevation, in partial section,

' of the cartridge for beam products;

coupling arrangement shown in FIGS. 23 and 24;

FIG. 18 is a split section of the cartridge showing on one half the bottom work roll and chocks and on the other half the top work roll and chocks;

FIG. 19 A-B-C diagrammatically shows various size wide flanged beams between the vertical rolls and a filler block for the screw-in;

FIG. 20 is an isometric partial section of the longitudinal adjusting means for the lower work roll;

FIG. 21 is a front section of the adjusting means shown in FIG. 20;

FIG. 22 is an end section of the adjusting means shown in FIGS. 20 and 21;

FIGS. 23 and 24 show the vertical screw-in drive-clutch means;

FIG. 25 is a section of the cooling fluid coupling means;

FIG. 26 is a diagrammatic view of the top cartridge sidewalls showing the bores for rapid coupling means;

FIG. 27 is a section of a grease/or oil rapid coupling means;

FIG. 28 is a section of a combination cooling fluid and oil or grease rapid coupling means;

FIG. 29 is a partial front elevation of the cartridge sidewalls showing the cooling passageways and rapid service coupling means;

FIG. 30 A,B,C are sections of the cross-over/carryover guide adjusting means at various center lines for differing rolled products;

FIG. 31 is a section of the opposing threaded means for positioning the spacing between the guides;

FIG. 32 is a section of the guide adjusting means mounting member and sleeve; and

FIG. 33 shows the guide in various positions for rolling, roll changing, and out of the line.

Referring to FIG. 1; I have shown my combination mill in beam rolling position just prior to a change over to a plate product. The combination mill includes a universal mill stand 1 having a fixed housing 2 on the drive side of the mill line and a movable housing 3 on the operators side of the mill line. The combination mill also includes an edging mill stand 4 having housings fixed in relation to each other. Universal mill stand 1 is designed to hold a universal-type cartridge 5 (more fully described hereinafter) that includes a pair of horizontal and vertical rolls. Edging mill stand 4 includes a cartridge-like assembly 6 containing a pair of edging rolls 7.

My mill line includes table roll assembly 8 positioned in front of universal mill stand 1 and having adjustable sideguards 10 movable by means of hydraulic cylinders 11 to coordinate the center line of the tables with the product being rolled as well as the movable housing 3.

Table roll assemblies

12 and 13, behind mill stands 1 and 4, are movable along

tracks

14 and 16 by means of

hydraulic cylinders

17 and 18 respectively. Tracks 14 are flanged or channeled so as to cooperatively retain the table supports that ride within the channel.

Table roll assemblies

8, 12 and 13 are, preferably, as wide as the widest separation between

housings

2 and 3 of stand 1. To accommodate various roll products, the product center line moves across the table as stand 1 is increased in size to accommodate increasingly larger rolled products.

A cartridge transfer means 19 is positioned to move in a line parallel to the mill line. Transfer means 19 has four tracked stations, A-D; alternative stations, A and C, and B and D, are simultaneously alignable with the housing windows in

stands

1 and 4. Transfer means 19 rides in a pair of

parallel guideways

21 and 22, and is moved by hydraulic cylinder 23, which is shown in its fully retracted position in FIG. 1. As shown in FIG. 1, stations B and D are aligned with the windows in

stands

1 and 4 respectively. When cylinder 23 is actuated and fully extended, stations A and C are aligned with

housing

1 and 4 respectively. Each station includes a set of tracks 24 that are alignable with

tracks

26 and 27 of the respective mill stands 1 and 4, and which extend over

cylinder

31 and 32 and lead to the roll shop or set up area.

Prior to converting the combination mill from one rolled product to another, replacement or conversion roll assemblies in the form of a cartridge are placed on the ready position of transfer means 19. The universal-type cartridge and cartridge-like assemblies are made up in the roll shop including the replacement of all chocks, rest bars and guides, internal hydraulic, lubrication, and cooling connections and alignment of the work rolls. The cartridge is then moved from the work shop area to the transfer means by utilizing either an overhead crane or by rolling it on its wheels. Building up the cartridge and aligning its work rolls in the work shop area as well as transporting it from the work shop area to the transfer means next to the mill line is accomplishedwithout shutting down the mill line. For example, positioned on station A is a previously assembled cartridge-like assembly 28 containing two horizontal rolls for rolling a desired plate product. Positioned on station C is cartridge 29 which is the same as cartridge 5 except that it is of a somewhat smaller size. Both of these cartridges are placed in their respective mills for rolling a plate product.

FIGS. 2 through 4 diagrammatically show the steps involved in converting from a beam-type product to a rolled plate product. Generally, the first step involves the removal of beam cartridge 5 from stand 1 by means of hydraulic cylinder 31, which is positioned under the tracks leading from the transfer means to the roll shop, and which is connectable to the cartridge by a hook latching means. Cartridge 5 is pulled along

tracks

26 and 24 and placed on station B of transfer means 19. Simultaneously therewith, the edging roll cartridge-like assembly 6 is withdrawn from stand 4 along

tracks

27 and 24 and positioned on station D of transfer means 19 by means of hydraulic cylinder 32, which is also positioned beneath the tracks to the roll shop. Hydraulic cylinder 23 is then fully extended to position transfer means 19 to a second position to align stations A and C with the windows in

stand

1 and 4 respectively. Simultaneously with the movement of the transfer means 19, housing 3 of stand 1 is moved from one of its narrower beam rolling positions to a wider plate rolling position. In order to reduce stand deflection, the mill housing separation is kept to the minimum width consistent with the product width rolled. Cartridge-like assembly 28, containing horizontal plate rolls and cartridge 29 containing pinch rolls and vertical edging rolls, are pushed into

stands

1 and 4 by

hydraulic cylinders

31 and 32 respectively. Hydraulic clamping means securely position the cartridges within the stand and at the same time function as utility service connections for a hydraulic fluid, oil or grease, and water for cooling. Hydraulic balancing means bothhorizontal and vertical as well as the screw-downs and screw-ups are positioned and adjusted. After these fittings have been made and the table roll side guards adjusted for the width of the product to be rolled, and the crossover guides adjusted, the mill is ready for production of plate. At a convenient time, cartridges 5 and 6 are taken back to the roll shop for either a partial or a complete interchange of newly dressed work rolls. Transfer means 19 is then placed in its ready position by retraction of hydraulic cylinder 23. Essentially the same procedure would be utilized from one size of beam to another, except that different sized rolls would be contained in the cartridges rather than types.

Converting from either a plate or a beam-type rolled product to a structural product involves the same procedure as described above, except that: First, the previously prepared cartridge-like assembly containing the horizontal structural rolls 33, FIGS. 5 and 6, is positioned on station A of transfer means 19. The cartridges of

stands

1 and 4 are removed by

hydraulic cylinders

31 and 32 respectively and positioned on stations B and D of transfer means 19. After extraction of the cartridges from the mill stands, mill stand 1 is widened by moving housing 3. As shown in FIG. 5, the combination mill is converted from a beam product having a narrow setting which requires that the mill stand be widened. Mill stand 4 is not necessary and is, therefore, moved out of the mill line by hydraulic cylinders 34. Mill stand 4 rides on its shoe plates in a manner similar to that of housing 3 of mill stand 1. Spindles 36 for driving the plate and beam rolls of stand 4 are supported by support 36a which is positioned between the mill stand and the motor (not shown). Spindles 36 enter the drive side of the housing window of stand 4 as it is moved from the mill line to the drive side. Table roll assembly 12 is moved along rails 14 and positioned in the space vacated by stand 4 by hydraulic cylinders 17. The full extension of cylinder 17 pushes table 12 and securely holds it in position. Hydraulic cylinders 18 are then fully extended to push filler roll table assembly 13 into a position vacated by table rolls l2.

Simultaneously with these operations, and after the positioning of housing 3, transfer means 19 is positioned to align the structural work rolls contained in cartridge-like assembly 33 with the window in housing 3 of stand 1. Assembly 33 is then inserted into the mill and the necessary connections and adjustments are made and the mill is ready for operation. A reverse operation of that heretofore described will convert the structural back toa plate or beam product.

When my combination mill has been arranged to roll a plate product, the edging mill stand is transformed into a small universal-type of mill by the use of cartridge 29 FIG. 7. Since stand 1 is connected to a larger drive or power unit, it carries out the primary reduction.

Stand 4, on the other hand, is generally connected to a smaller drive unit and is utilized as an edging mill with the horizontal rolls acting as pinch rolls for the nondriven vertical edging rolls. Since edging forces on small to medium sized plate or strip are small, the pinch roll power is considered sufficient to do the driving work. Eventual marking on the plate or strip by the somewhat narrower-than-plate pinch rolls is flattened out by rolling the last pass through only the reduction rolls of stand 1.

Referring to FIGS. 7 through 10, stand 1 is supported on

shoe plates

37 and 38, and stand 4 is supported by

shoe plates

38 and 39, all of which are securely fastened or mounted to the foundation of the mill. Shoe plate 38 is designed to support one half of each of stands 1 and 4 to keep the distance between the stands to a practical working minimum. Stand 1 includes a movable housing 3 which is secured to

shoe plates

37 and 38 by a pair of clamping means 41, and a fixed housing 2 permanently bolted to the plates. Clamping means 41 is operated by means of hydraulic cylinder 42 connected at toggle joint arm 43. The jaws of clamp 41 rigidly hold housing 3 to

shoe plates

37 and 38. The toggle joint arms 43 in combination with the retracted position of the cylinder 42 maintain a fail safe clamping means to prevent the mill house from separating during rolling in the case of a hydraulic or other type of power failure. Self aligning pads 44 provide excellent contact with the shoe plates for maximum clamping of the housing. Mill housing 2 is fixed and is used to position the mill equipment, such as the cartridge, to the center of the mill line. It, therefore, must be securely anchored to the shoe plates or foundation.

Mill stand 4 includes a pair of mill housings that are not movable relative to each other. However, the mill stand must be movable along

shoe plates

38 and 39 when the line is converted to a structural product. Stand 4 is movable along the plates into and out of the mill line by hydraulic cylinders 34. Stand 4 is aligned and secured to the shoe plates by the full extension of cylinder 34 and clamping means 46. Clamping means 46 includes the same arrangement as that used in stand 1, including a pair of jaws and toggle joint arm actuated by hydraulic cylinder 47. Within stand 4 are a pair of rails 27 for carrying and supporting cartridge 29 which contains horizontal rolls 48 and vertical edging rolls. A pair of screw-downs 49 and screw-ups 51 operated by the

respective drive assemblies

52 and 53 provide the mill stand 4 with accurate roll adjustment for rolling both plate and beam products. The stand is also provided with hydraulic balancing cylinders (not shown) and hanging rods 55 to relieve any slack between the screwdowns and the upper chocks 56 of roll 48. Stand 4 includes a set of crossover guides 57 which can be pivoted by hydraulic cylinder 58 attached to the mill housing to free the guides from stand 1 when stand 4 is moved from the mill line. A pair of guides 170 are mounted to

stands

1 and 4. These guides can be rendered ineffective for structural rolling and replaced by carryover guides 167 mounted to the table roll assemblies. Guides 170 are quickly adjustable both as to width and center line when changing beam widths or plate products. The adjustment can be either manually or motor actuated, and either center line or width can be changed without disturbing the other setting. Accordingly, there is no need for laborious inserting, bolting or wedging down any guides after new rolls have been inserted into the mills. The stripper guides 163 and 164 are premounted on the chocks or cartridge in a set up area prior to mill conversion. Set at the proper width, the housing mounted

guides

170 and 57 serve as a continuation of chock or cartridge mounted stripper guides 163 and 164. Because of unique operation of our guide arrangement, this aspect of mill changeover is dramatically reduced.

Table rolls 12 include adjustable side guards 59 and at least 3 supports, two of which, 61 and 62, are spaced apart a distance equal to the separation between

shoe plates

38 and 39 upon which they rest when table 12 is moved into the space vacated by stand 4 during the rolling of the structural product. Supports for table 12 are interlocked with flanges on rail 14 to prevent the tables from pivoting when it is extended across the shoe plates. The table roll assemblies also are pivotable about points 161 between the upper and lower portions of the table and are actuated by wedges, etc., not shown. The tables are tiltable a few degrees to make up for the differences in flange height of various products.

Referring to FIGS. 9-13, mill stand 1 includes a set of rails 26 extending the width of the stand. Rails 26 are preferably made of a solid rod having on its top a flattened portion along which the wheels 63 (FIG. 14) ride. Rails 26 are preferably of a shaft design to provide better weight distribution and. minimize stress concentration in the mill stand. The stop position for the cartridge when inserted into the mill housing are small depressions 65 into which wheels 63 drop so that the entire unit rests on the sides of the cartridge.

Mill stand 1 includes a pair of screw-

downs

64 and 66 which are driven by motor 67. Motor 67 is operably connected to the screw-downs through drive gear 68 and drive shaft 69. Drive shaft 69 is splined from K to L a length, preferably, at least equal to the width of the widest separation of

mill housings

2 and 3. Shaft 69 is fixedly mounted to housing 3 and in gear train drive with gear and support unit 71 and slidably mounted through gear means 75. Gear means 75 is adapted to a gear train relation with shaft 69 through its length K through L and in gear train drive with gear 68 and gear train 72 which is operably connected to screw-down 66. Screw-down 64 is operably connected through gear and support unit 71. Shaft 69 is slidably moved through gear means 75 when housing 3 is moved. Because the splined portion of the shaft is maintained in gear train relation with gear means 75, screw-

downs

64 and 66 are always mechanically synchronized through the various positions of housing 3. A pair of screw-

ups

73 and 74 are provided for the lower work roll chocks which are of the same configuration and operation as screw-

downs

64 and 66 respectively. Synchronizing power shaft 76 includes a portion splined the same manner as synchronizing power shaft 69 for the screw-downs which operates in the same way when the housing is moved. The motors for operating both the screwdowns and screw-ups are electrically synchronized.

Mill stand 1 also includes a pair of hydraulic balancing units each having a pair of hydraulic cylinders 77 connected together by balancing arms 78 from which depend a pair of hanging rods 79 having at their bottom portions jaws 81 that coact with the upper chock legs 82 of the horizontal rolls.

Housing 3 is moved along the shoe plates by means of a pair of motor driven shafts 83 mounted on both sides of the housing. Both shafts are driven by the same power unit 54 (H6. 7) and are connected and driven through a hollow shaft speed reducer 84. Shaft 83 is movable through and supported by support unit 86 mounted at the base of housing 2. Shaft 83 is secured to the movable housing 3 by support member 87. The shaft 83 is free to rotate within member 87 so that shaft 83 may be screwed through unit 84 to provide the translatory motion required to move housing 3. At the upper portion of the mill stand and spanning the two housings are a pair of notched bars 88 having a plurality of notches 89. Each bar 88 is securely positioned and mounted to movable housing 3 and is adapted to slide through guideway 90 mounted on housing 2. To add stability and rigidity to the upper portion of mill stand 1 a pair of hydraulically actuated cylinders 92 attached to either side of the upper part of mill housing 2 are engageable in notches 89. Each notch represents a preselected mill width for rolling a preselected or predetermined size of rolled product. For. example, the notch representing the widest separation between

housings

2 and 3 could be utilized in the production of structurals. The narrowest, on the other hand, may be used for a 6 to 12 inch wide flange beam.

My mill is uniquely adapted to quick roll change from one size product to another or to different products without costly down time because the most laborious tasks can be done while the mill is operating. In the past, conversion from one product to another or to a different sized product required excessive down time because of work roll changeover. With my mill almost all of the changeover is done prior to shutting down the mill. 1 have been able to accomplish this with a unique car-

Claims

1. A combination rolling mill for rolling beam, structural and plate products comprising: A. first and second cartridge loadable mill stands, said first stand including a movable housing on the operator''s side and said second stand being movable to the drive side out of the mill line and adapted to support its spindles when out of the line; B. at least one cartridge movable into and out of said stands and having at least one set of work rolls; C. a transfer means movable along a line parallel to the mill line for supporting and transferring cartridges and including four stations, alternate stations being simultaneously alignable with the windows in said stands; D. means for moving said cartridge from the transfer means into a mill and from a mill onto the transfer means; E. means for moving the transfer means to one of two positions; and F. at least two table roll assemblies positioned behind said second stand, one of said tables being movable along the mill line and adapted to occupy the space vacated by the second stand when moved out of the mill line and said other table being movable into and out of the line to occupy the space vacated by the table filling the vacated mill stand space.

2. A combination mill as set forth in claim 1 wherein said first mill stand includes a motor operated screw means for moving said movable mill housing.

3. A combination mill as set forth in claim 1 wherein said first and second mill stands include hydraulic clamping means adapted to engage said cartridge and having at least one utility service connection for hydraulic fluid, grease and water, and wherein said cartridge includes means for receiving said clamping means.

4. A comBination mill as set forth in claim 3 wherein said first mill stand includes a notched bar mounted on the top of movable housing having preselected openings engageable with cooperating means on the fixed housing for setting the width of said mill housing in relation to the preselected openings.

5. A combination mill as set forth in claim 1 wherein said cartridge includes an upper and lower horizontal work roll and associated chocks and a pair of vertical rolls and associated chocks, said upper work roll chocks including legs to cooperate with hanging rods of the mill stand and landings for the mill stand screw-downs, said lower roll chocks including landings for screw-ups of said mill stand, said cartridge also including at least one pair of screw-ins and a balancing cylinder for said vertical work roll.

6. A combination mill as set forth in claim 1 wherein said table rolls assemblies are vertically adjustable about a pivot point for accommodating various sized rolled products.

7. A combination mill as set forth in claim 1 wherein carryover guides are provided between said first and second mill stand, said guides including means for independently adjusting the width of said guide and means for independently positioning said guide on the center line of pass line.

8. A rolling mill stand adaptable to cartridge loading of work rolls comprising: A. first and second mill housings, said first mill housing being movably mounted on the operator''s side of the line and having a window therein, said second stand being securely mounted; B. means for moving said first mill housing; C. a pair of screw-ups and screw-downs, one of each pair associated with each housing; D. means for synchronously operating each pair independently of the other pair; E. a pair of hydraulic balancing cylinders associated with each housing; F. guideways extending through each housing and extending through a window in said first housing for guiding a cartridge; and G. means for selectively positioning the first housing and extending between said housings.

9. A rolling mill stand as set forth in claim 8 wherein said means for moving the first housing includes a motor and a screw drive member, said drive member being rotatably mounted to the first housing and operably engaged with said motor, said motor being securely mounted to cause said drive members to be driven therethrough.

10. A rolling mill stand as set forth in claim 8 wherein said means for synchronously driving each pair of screw members includes a gear associated with and operably connected to each screw, a motor, and a shaft connected to said motor and in operable engagement with said gears, said shaft being splined a portion of its length for sliding engagement with one of said gears throughout the length of said splined portion.

11. A rolling mill stand as set forth in claim 8 wherein said means for selectively positioning said first housing comprises an elongated member securely positioned to the upper portion of said first housing and slideably mounted to said second housing, said member having preselected openings therein, and a hydraulically actuated engaging element mounted on said second housing for engaging said openings to securely and selectively position said first housing.

12. A rolling mill stand as set forth in claim 8 including a pair of hydraulically actuated service coupling mounted on the second housing and adapted to cooperatively and sealingly engage a cartridge, said service members comprising an elongated member having at least one passageway therethrough adapted to communicate with a passageway in the cartridge when cooperatively engaged therewith, said passageway being connected to a source of at least one of grease, oil and water.

13. A pair of service couplings as set forth in claim 12 wherein said member includes first and second passageways therethrough, said first passageway adapted to communicate with a first passageway in said cartridge and saId second passageway being adapted to communicate with a second passageway in said cartridge when said member is cooperatively and sealingly engaged with said cartridge, said first passageways of said pair being connected to a source of water, one of said second passageways being connected to a source of grease and said other second passageway being connected to a source of hydraulic fluid.

14. A pair of service couplings as set forth in claim 12 including hydraulic actuating means provide a pressure greater than that required for sealing engagement of said member thereby effecting a clamping between the stand and a cartridge.

15. A plate mill comprising: A. first and second cartridge loadable mill stands, said first stand having one movable and one rigid housing, said movable housing being on the operator''s side; B. first and second cartridges movable into and out of said first and second mill stands respectively, said first cartridge having a pair of horizontal work rolls and said second cartridge having a pair of horizontal and vertical work rolls; C. means for moving said first and second cartridge into and out of their respective mill stands; and D. means for driving said pairs of horizontal rolls.

16. A beam mill comprising: A. first and second cartridge loadable mill stands, said first stand having one movable and one rigid housing, said movable housing being on the operator''s side; B. first and second cartridges movable into and out of said first and second mill stands respectively, said first cartridge having a pair of horizontal and vertical work rolls and said second cartridge having a pair of horizontal work rolls; C. means for moving said first and second cartridges into and out of their respective mill stands; and D. means for driving said pairs of horizontal rolls.