US2575080A

US2575080A - Scarfing machine

Info

Publication number: US2575080A
Application number: US108336A
Authority: US
Inventors: Joseph M Tyrner
Original assignee: Air Reduction Co Inc
Current assignee: Airco Inc
Priority date: 1949-08-03
Filing date: 1949-08-03
Publication date: 1951-11-13
Anticipated expiration: 1968-11-13

Description

Nov. 13, 1951 J. M. TYRNER SCARFING MACHINE 4 Sheets-Sheet l Filed Aug. 3, 1949 Nov. i3, 1951 J. M. TYRNER 2,575,080

' SCARFING MACHINE l Filed Aug. 5, 1949 4 Sheets-Sheet f2 INVENTOR JOSEPH M. TYRNER ATTORNEYS Nov. L3, 1951 J. M. TYRNER scARFING MACHINE 4 Sheets-Sheet 3 Filed Aug. 3. 1949 FIG. 4

FIG. 5

INVENTOR JOSEPH M IYRNER Y mi z aww ATTO RN EYS ov. 13, 1951 J, M, TYRNER 2,575,080

SCARFING MACHINE Filed Aug. 3, 1949 4 Sheets-Sheet 4 INVENTOR HG, 9 JOSEPH M. TYRNER ATTORNEYS Patented No'. .19517 V scAnFiNG momma Joseph M. Tyner, Mendham Township. Morris County, N. J., assigner to Air Reduction Company, Incorporated, a corporation ofNew'Yorkl l application Anm: a, i949, serial No. masse s This invention relates toscarfing machines for thermochemically scarilng or desurfac-ing billets, blooms. and similar metal bodies, and particu-4 larly to that type of scarfing machine which is adapted to scarf all four surfaces of a rectangu lar billet simultaneously.'

Not only is it advantageous for a scarnng machine to be capable of scarilng the four surfaces of a rectangular billet simultaneously in' a single pass, but it is also advantageous that the machine be able to accommodate billets of various sizes and not be restricted in use to any one size. Often in the course of a days production a single conveyor roll of a steel mill will pass successive bloomsl or billets diifering in size within a matter of a few minutes. Consequently it is desirable that the scarflng machine beextremely ilexible in its accommodation of billets of different sizes and that it be possible to make the necessary changeover adjustments rapidly.

achim. (cisneszn n slides objectionable because the relatively slid-y able surfaces are yextremely `vulnerable to wear and also to the flying slag which can soon interfere withstheirproper functioning.

ItL is therefore an object" ,of this invention to provide an improved scarilngmachine that may be used for scariingall four surfaces of rectangular billetsandsimilar metal bodies'simultaneously' and whose scarfing burners can be moved rapidlyintoy scariing relation with4 the billet surfaces without changing ther angularity of the scarflng jets with respect to the work surfaces Scarilng machines have already been-built that scarring oxygen jets' with respect to the workl surfaces. 'I'his is tobe avoided if possible since it detrimentally affects the efiiciency of the scarfing operation. In other machines the burners are so supported.' as by folding parallelogram frames, that when they are moved toward or away from the billet the angularity of the scariing oxygen jets with respect to the work surfaces does not change but such movement of the burners has a component of movement longitudinally of the billet and unless al1 of the burners are moved through the same distance to bring them intoscarng relation with the billet they will not, in their final position against the billet surfaces, be disposed in the same transverse plane. Consequently, the scarilng front at one surface of the billet does not coincide with the scarflng front at a contiguous surface and an undesirable flash or reweld is often formed at the meeting or moving Vthe burners out of the same general transverse plane and `without resorting to the use of sliding partsto` accomplish' these results.

According Atojthe inventionthe scarfing machine comprises a main support which extends on opposite sides of the millv rolltable along which the billets vare conveyed or which is movable to a positionin which it hasthatrelation with the fmill roll table.- Two burner carriers are mounted on `the main support and liey at opposite sides .of the billet when the machine is in scarring relationV with the billet. On each burner carrier there is mounted' a scarng burner, or two scarfing burners arranged in right angular relation so that one burner ofthe p'air vcan scarf a side surface of the billet and the otherone can scarf the top or bottom contiguous surface of the billet. v'Ihere are two linkage structures each of which movably supports and guides one ofthe burner carriers on the main support. Each of these linkage structures comprises swinging arms which plvoted to themain support at one side of the machine and which are lpivotally interconlelo'gram` andv each of the 'linkage structures vfurther'comprises additional swinging arms which 'are pivotally connected to the primary folding parallelogram frame and to the burner carrier so as toform a' second lfolding parallelogram frame which swings on the first one and which is herein called 1 the secondary folding parallelogram frame.) of the pivot axes of the folding parallelogram framesare parallel: to the longitudinal axis of`4 the billet. andbecause of this fact, and

'becauseof the fact that each burner carrier forms `a `part of vthe secondary :folding parallelogram frame thatfswings on the primary folding paral- {ielogram frame each burner can be moved parallel Q00 itself and in anyfdirection in a vertical plane and" 'lwithoutany accompanying component `of annoso il quently, the burners carried by the burner carriers can be moved in and out or up and down without changing the angularity of the scarring jets with respect to the surfaces of the billet and without moving them out of the same general transverse plane. i

Two forms of a scarflng machine embodying the invention are illustrated in the accompanying drawings, in which:

Figure 1 is a front elevation of one form of the machine;

Fig. 2 is a vertical section taken along the line 2--2 of Fig. 1;

3 is a front elevation. partly in section, of one of the burner carriers and the parts carried by it;

Iig. 4 is a. vertical section taken along the line 4l-4 of Fig. 2;

Figs. 5 and 6 are schematic illustrations of the linkage structure that supports and guides one of the burner carriers, the two figures showing the position of the parts when the burner carrier is moved to differentpositions.

lFig. 7 is a front elevation of a modified form df the scarng machine; and

- Figs. 8 and 9 are schematic illustrations'of the linkage structure that supports one of the burner carriers of the machine shown in Fig. '1, the two figures showing the position of the parts when the burner carrier is moved to diiferentpositions.

Referring first to Figs. 1-4, the scarng' machine therein illustrated has a main support or frame which comprises a wheeled carriage I (Fig. 1) movable along a track II. The track extends transversely of the mill roll table so that the carriage can be moved to and from a position under it. One of the rolls of the mill roll table is represented at I2. It is journalled in stanchions I3 supported on the floor I4. A billet supported on the rolls of the mill roll table is represented at B. The track Il is preferably located in a pit which extends transversely of the mill roll table so that the carriage I0 will be below the level of the floor I4. When the machine is in scariing relation with the billet B on the mill roll table, carriage, I0 extends on opposite sides of the billet, and by the linkage structures hereinafter described, supports the scarng burners at the billet level.

The left side of the carriage I0 in Fig. 1 carries brackets l and I6 in which shafts I1 and I8 are mounted, respectively. An upright arm I9 swings about the axis of the shaft I1. As shown in Figs. 2 and 4, this arm may be an I- beam member which is formed integrally at its l The upper end of the plate-like swinging arm I9 is formed integrally with a sleeve 22 (Figs.

carriage to which they are pivoted and with thev connecting links 25 a folding parallelogram frame. This is the primary folding parallelogram frame previously referred w. The shaft I8 is located at a higher level than the shaft I1 and the shaft 24 is located ata. correspondingly higher level than the shaft 23, asshown in Fig. l, so that the connecting links 25 are inclined at an angle of about 45. This makes it possible to providea second folding parallelogram frame based on the links 25 and which projects in a generally horizontal direction so 2 and 4) through which a shaft 23 passes. A

shaft 24 passes through the upper ends of the swinging arms 2I, and the two

shafts

23 and 24 are pivotally interconnected by a pair of links 25. The arms 2l may have collars 2l (Fig. 2) at their lower ends which surround the shaft I8 and may have collars 2l" at their upper ends which surround the shaft 24. Sleeves Ila position the collars on the shaft I8 and sleeves 2lb position the collars on the shaft 24. As best seen from Figs. l and 4, the upright swinging arms I3 and 2| form with the portion of the that it can support one of the burner carriers at its free end. This foldingv parallelogram frame is the secondary folding parallelogram frame previously referred to and includes a pair of Swinging arms 25 (Figs. 1, 2 and 4) constituting in effect a-single arm, which are pivotally connected at their outer ends to the shaft 23 and at their inner ends to a shaft 21 mounted in brackets 28 connected to the burner carrier 23. 'Ihe secondary folding parallelogram frame also includes an arm 30 which is pivotally connected at its outer end to the shaft 24 and at its irmer end t0 a, shaft 3| mfunted in the burner carrier 29. As best shown in Fig. 2, the burner carrier 29 is a frame made up of two transversely extending

parallel channel members

32 and 33, a tcp horizontal plate 34 supported by them, and a vertical plate 35 (Figs. 1 and 4) connecting their inner ends. The above-mentioned brackets 28 in which the shaft '21 is mounted depend from the lower flanges of the two

channel members

32 and 33, and theabove mentioned shaft 3| to which the inner end of the swinging arm 30 is pivoted is journalled in bearings 3I secured to'the vertical webs of the two channel members asbest shown in Fig. 2. A vertically disposed burner 36 for scariing the left side surface of the billet as viewed in Fig. 1 is attached to the vertical plate 35 of the burner carrier as shown in this figure, and a horizontally disposed burner 31 for scarflng the top surface of the billet is supported on the horizontal plate 34 of the burner carrier. The burner 31 is slidably mounted on the plate 34 and is capable of limited horizontal adjustment thereon transversely of the machine for the purpose hereinafter described. The adjusting means for the burner 31 is best shown in Fig. 3. The burner is secured to a cylindrical bar 38 which is guided in blocks 39 in which the bar can slide longitudinally. The bar has a tapped drilling 40 in its distal end which receives a threaded spindle 4I. This spindle is rotatably mounted in a bearing block 42 and carries a hand wheel 43 by which it can be rotated. When the threaded spindle 4I is rotated by means of the hand wheel the bar 38 is caused to move lengthwise and adjust the position of the scarng burner 31.

Referring again to Figs. l and 4, a link 44 similar to the upright swinging arm i9 supports the inner free end of the secondary folding parallelogram frame and helps impart up and down movement to it as hereinafter described. This link has a sleeve 45 at its upper end (Fig. 4) which surrounds and can pivot on the shaft 21. The lower end of the link has a similar'sleeve 45 which surrounds and can pivot on a shaft 41 mounted in a lower link made up of two channel members 48 and 49 (Fig. 2). Only one of these channel members appears in Fig. 1 and the companion one appears in Fig. 4. At their outer ends they are fulcrumed on the shaft I1. One of these two channel members has an outward extension B as shown in Fig. 1 which is pivotally connected at to a piston rod l2 of a duid cylinder 5L The fluid cylinder 53 is located in an enclosure M in which it is pivotally suspended at .88 by means of a bracket 5I. The piston rod l2 is connected to a piston (not shown) which operates in the cylinder i3. and when motive iluid is admitted to and discharged from the cylinder by wellknown means, not illustrated in the drawing. the piston may be moved in the cylinder to swing the link 48-49 about the axis of the shaft Il. Since the inner end of the link 48-49 is connected by means of the link I4 tothe shaft 21 and henceto the free end of the secondary folding parallelogram frame, this will pivot the secondary parallelogram frame on the

shafts

23 and 24 to thereby move the burner carrier 29 up or down, its

successive positions always being in parallel relation. This movement of the scarnng burner carrier is schematically illustrated in Fig. 6 in which the full-lines represent the position of the parts in Va relatively low position of the burner carrier and the dotted-lines represent their position in a more elevated position of the burner carrier. 1t will be noted that during the up and down movement of the scarflng burner carrier depicted in Fig. 6 the upright swinging arms I9 and ti of the primary folding parallelogram frame do not move provided the iluid cylinder which actuates them as hereinafter described is allowed to remain idle at this time.

To eifect in and out movement of the burner carrier in a generally horizontal direction, the sleeve it at the lower end of the upright swinging erm it has a pair of outwardly extending arms Eil formed integrally with it (Figs. 1; 2 and d), and these arms are pivotally connected to the piston rod of a second fluid cylinder which lies directly behind the fluid cylinder b3 in Fig. 1 and therefore does not show in this figure. However, the second fluid cylinder is represented at 53a in Fig. 5 which is a schematic view similar to Fig 6 illustrating the position of the parts when the burner carrier is moved in or out. The piston rod 52a of the fluid cylinder 53a is pivotally connected at bla to the above-described arms 5l which form an integral part oi' the sleeve 2t at the lower end of the upright swinging arm it. When motive uid is admitted to and discharged from the cylinder 53a by well-known means not illustrated in the drawing, the arms 5l are actuated to swing the arm i9 of the primary folding parallelogram frame about the axis of the shaft il. 'I'his pivots the entire primary parallelogram frame on the shafts il and iii and imparts in or out movement to the scarflng burner carrier 2@ and hence the scarring burners carried by it, will always move in the same general vertical .plane and the burners will always move parallel. to themselves. i. e., their successive positions will be in parallel relation regardless of the direction of their movement. Y

A vertically disposed burner Ii and a horizontally disposed burner II for scarring the other side surface of the billet and its bottom surface are supported at the right side of the machine (Fig.` l) by a burner carrier and a double folding parallelogram linkage similar to that above described except for the necessary reversal of parts. The same reference numerals have been used in the drawings to designate corresponding parts at the opposite sides of the machine. It should be noted, however, that. whereas the vertically disposed burner 36 at the A left side oi' the machine is mounted directly on through the secondary parallelogram frame. In

Fig. 5 the full-lines represent the position of the parts when the burner carrier is in one position t and the dotted-lines represent the position of the parts when the burner carrier is moved to a more outward position with respect to the billet by operation of the iiuid cylinder 53a. It will be noted that if the fluid cylinder 53 is not operated at the same time as the fluid cylinder 53a, the secondary folding parallelogram frame will not pivot to any great extent on the

shafts

23 and 24 during movement of the primary folding parallelogram frame. However, the link M will swing about the axis of the shaft 4l and will support and guide the inner end of thesecondary 'parallelogram frame. The successive positions of the burner carrier during its movement will always be in parallel relation. Oi, course, both iluid

cylinders

53 and 53a may be operated at the same the vertical plate 35 of its burner carrier, the vertically disposed burner I3 at the right side of the machine is attached to a special bracket 60 supported on the top plate 34 of the burner carrier. The horizontally disposed burner 58 for scarng the lower surface or the billet is slidably mounted on the burner carrier at the right side of the machine and adjusted thereon transversely of the machine in the same manner that the other horizontally disposed burner @l is slidably mounted and adjusted on its carrier at the left side of the machine.

The two folding parallelogram frames at the right side of the machine are actuated by iluid cylinders in the same manner as those at the left side to impart in and out and also up and down components of movement to the pair of burners 58 and bt.

The oxygen discharge face of each burner is shown at f. In the position to which the upper and lower horizontally disposed burners il and 53 are adjusted in Fig. l the oxygen-discharge face of each of these burners extends about onehalf of its length inwardly beyond the oxygendischarge face of the companion vertically disposed bumer that is mounted on the same burner carrier with it. This adjustment of the burners is suitable for a relatively narrow rectangular billet such as shown in Fig. l. For successively wider billets the upper and lower horizontally disposed burners are adjusted so that a correspondingly greater portion of the oxygen-discharge face of each of them will project inwardly beyond its companion vertically disclosed burner. In Fig. 3 the broken-line position of the upper and lower horizontally disposed

burners

31 and 59 represent the positions to which they may be adjusted for scarfing a billet B having the maximum width which the machine .is designed to scarf. The vertically disposed

burners

36 and 58 will accommodate billets of any height up to the length of the oxygen-discharge faces af these burners. Since all of the burners of the particu'- lar machine illustrated in the drawings have oxygen-discharge faces f of the same length the largest billet which the machine illustrated is designed to scarf is the billet B of square cross-section shown in Fig. 3.

It will now be seen that the machine will scarf billets or similar workpieces ranging in size from the minimum size to the maximum size which the machine will accommodate, and that for any billet Within this range .the scarng burners can be brought into contact with the surfaces of the billet by actuating the two folding parallelogram frames at opposite sides of the machine in the manner previously described. The burners are originally positioned in the same general vertical plane when the machine is assembled and they will not move out of this plane during their movement into scarfing position. The burners will always move parallel to themselves and the angularity of the scarng Jet passages will not change during movement of the burners into contact with the billet surfaces. f

A flash or reweld could occur at the meeting edge of the two contiguous surfaces of the billet scarfed by the relatively

movable burners

28 and 59 if the scariing fronts of these two burners did not lie in substantially the same vertical plane when these burners are moved into contact with the billet surfaces. and the same is true with respect to the meeting edge of the two contiguous surfaces scarfed by the

relativelymovable burners

81 and 68. But since the linkage structures herein described move the

burners

36 and 58 into contact with the billet surfaces they are intended to scarf without imparting any component of movement to either of them lengthwise of the billet, the scarnng fronts oi' these two burners will always lie in the same general vertical plane regardless of the size of the billet, and the same is true with respect to' the

burners

31 and 58.

A modified form of scarfing machine in which the burners are supported by linkage structures differing somewhat from those above described but operating on the same principle is shown in Fig. '7.' In this form of the machine the linkage structure for each of the two burner carriers hangs downwardly from the superstructure of the machine as opposed to the machine previously described in which the linkage structure fo;` each of the burner carriers extends upwardly from the base of the machine. The machine shown in Fig. 7 comprises a Wheeled carriage I0 movable along a track I I'. As in the case of the first form of the machine, the track extends transversely of the mill roll table so that the carriage can be moved to and from a position under it, and the track is located in a pit so that the carriage will be below the floor level. One of the rolls of the mill roll table is represented at i2.

An arch-like frame 6| is mounted on the carriage I which straddles the mill roll table and supports the linkage mechanism for the burner carriers. The burners are shown at 82, 68, and 65. Burner 62 for scarfingA the top surface of the billet and the companion burner 83 for scarfing the right side surface of the billet as viewed in Fig. 1 are mounted on a frame 68 which constitutes a burner carrier for these two burners. The burner for scarfing the bottom surface of the billet and the burner 65 for scarflng the Aleft side surface of the billet as viewed in Fig. 7

are mounted on a frame b61 which constitutes a burner carrier for these two burners.

The burner carrier 61 hangs on arms 88 and $9 which depend from shafts 10 and 1I respectively. The shafts 10 and 'Il are connected by a link 12 and are held in suitable bearings carried by the distal ends of two arms 1'3 and 14.v

The-arm 13 pivots about a fixed shaft 15 supported near the upper lefthand corner of the arch-like frame =B|, and the arm 14 pivots about to which the arms 1I and 14 are pivoted, constitute a primary folding parallelogram frame corresponding to the primary folding parallelogram frame inthe nrst form o fmachine previously'described. The arms 88 and 88, the link 12, and the portion of the burner carrier to which the arms Il and l! are pivoted, constitute a secondary folding parllelogram frame corresponding to the secondary folding parallelogram frame in the first form of the machine. The primary folding parallelogram frame-pivots about the shafts 1l and 18 and the secondary folding parallelogramyframe pivots about the shafts 10 and 1|. It will thus be seen that the two folding parallelogram frames can be operated tolmove the burner carrier in and out or up and down with no component of movement in a directionlengthwise of the billet and the movement of the burner carrier will always be parallel to itself.

The arm 1l is extended beyond its pivot shaft 18, as shown, and is pivotally connected at 18 to a fluid cylinder 19, the piston rod of which is pivotally connected at to a bracket '8| attached to the side of the arch-like frame 8i. Motive fluid 'admitted to and discharged from the cylinder 19 by well-known means, not shown in the drawing, actuates the linkage to move the burner carrier 61 up or down. A second fluid cylinder 82 pivotally connected to the bracket 8l, and whose piston rod 83 is pivotally connected to the burner carrier i1, may be operated in a similar way to swing the depending arms 68 and 89A about the axes of the shafts 10 and 1I and impart in and out movement to the burner carrier.

The adjustments of the burner carrier 81 by operation of the two

fluid cylinders

18 and 82 is schematically illustrated in Figs. 8 and 9. In Fig. 8 the full-lines represent the position of the parts in an inward position of the burner carrier 81 and the dotted-lines represent the position of the parts when the fluid cylinder 82 is operated to move the burner carrier outwardly while the fluid cylinder 18 is allowed to remain idle. In Fig. 9 the full-lines represent the position of the parts for a relatively low position of the burner carrier 61 and the dotted-lines represent the position of the parts when the fluid cylinder 18 is operated to move the burner carrier upwardly while the fluid cylinder -82 is allowed to remain idle. Both of the fluid cylinders may be operated simultaneously, if desired. so that both sets of movements shownv in Figs. 8 and 9 may occur at the same time.

'I'he mechanism for supporting and moving the burner carrier 61 is duplicated at the opposite side of the machine with the necessary reversal of some of the parts, for supporting and moving the burner carrier 86. Corresponding parts at opposite sides of the machine are designated by the same reference numerals in the drawing.

As in the case of the first form of the machine, certain of the scarfing burners are adjustably mounted on the burner carriers to accommodate billets of different width. In this case the two vertically disposed burners 83 and 651 are adjustable horizontally toward and away from the billet as shown at 84 to vary lthe amount which the upper burner 82 projects to the left beyond the burner 63 and to vary the amount which the lower. burner 84 projects to the right beyondv the burner 85.

In both forms of the machine, operation of the fluid cylinders will cause the linkage structures that support and guide the two burner carriers to move the scarilng burners toward the billet and each burner will automatically assume its proper position in contact with the corresponding surface of the billet. 'Ihe burners are moved to scarng position against the surfaces of the` billet without varying the angularity of the scarfing jets and without imparting to `any of the burners a component of movement axially of the billet and which would tend to cause the scarng front of the burners lcarried by the burner carrier at one side of the machine to lie in a different vertical plane from the scarng front of the burners carried by the burner carrier at the opposite side of the machine, and these things are accomplished without resorting to the use of any sliding parts in the supporting and guiding mechanism for the burner carriers.

I claim:

1. A scarring machine for scarng the surfaces of billets and similar metal bodies, comprising a main support, means for obtaining relative movement between a billet and said main support in a path extending in a direction lengthwise of the billet, two burner carriers having parts positioned at opposite sides of said path, a scarfing burner` mounted on eachof said parts of said carriers, each burner comprising a series of orices extending in at least two directions to direct a scarfing flame onto at least two adjacent sides of a billet, means for maintaining said burners substantially in alignment in a direction transversely of said path and for moving said burners toward and from said path in a direction parallel to themselves, said means including two linkage structures each movably supporting one of said burner carriers on the main support, each of said linkage structures comprising swinging arms pivoted to the main support at one side of the billet, at least one link pivotally interconnecting said arms and forming with them and with the portion of the main support to which they are pivoted a folding parallelogram frame, and additional swinging arms pivotally connected to a portion of said folding parallelogram frame and to the corresponding burner carrier so as to form a second folding parallelogram frame which swings on the rst one, all of the pivot axes of the folding parallelogram frames being parallel to the longitudinal axis of the billet.

2. A scarfing machine in accordance with claim 1 having power means operatively connected to a part of the first folding parallelogram frame of each linkage structure for swinging lts arms about their pivotal connections to the main support and for holding such arms in the position to which they are swung, and power means operatively connected to a part of the second folding parallelogram frame of eac'h linkage structure for swinging its arms about their pivotal connections to the first folding parallelogram frame and for holding such arms in the position to which they are swung.

JOSEPH M. TYRNER..

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS