US2913808A

US2913808A - Method for the continuous removal of the scaly matter from hot-rolled, band-like iron products

Info

Publication number: US2913808A
Application number: US561090A
Authority: US
Inventors: Thomas Ernst; Aurin Bruno
Original assignee: THOMAS Co
Current assignee: THOMAS Co
Priority date: 1955-01-26
Filing date: 1956-01-24
Publication date: 1959-11-24
Anticipated expiration: 1976-11-24

Description

Nov. 24, 1959 E. THOMAS ET A:.

unmoo FOR THE commuous REMOVAL OF THE SCALY MATTER FROM HOT-ROLLED, B A lfi l )-LIKE mow PRODUCTS 3 Sheets-Sheet 1 Filed Jan. 24, 1956 Inventor's fr/vsr 77/0/1451: 4

5FI/NO flue/1v 517%" n) 1959 E. THOMAS ET AL 2,913,808

METHOD FOR THE CONTINUOUS REMOVAL OF THE SCALY MATTER FROM HOT-ROLLED, BAND-LIKE Y IRON PRODUCTS Filed Jan. 24, 1956 :5 Sheets-Sheet 2 m Sk fen/s7 77/0MA5 4' Bea/v0 Haw/v 1959 E. THOMAS ET AL ,9

METHOD R THE CONTINUOUS REMOVAL OF THE SCALY TER FROM HOT-ROLLED, BAND-LIKE w IRON PRODUCTS Filed Jan. 24, 1956 3 Sheets-Sheet 3 Inventors fkA/Jr 77904463 United States Patent "ice METHOD FOR THE CONTINUOUS REMOVAL OF THE SCALY MATTER FROM HOT-ROLLED, BAND-LIKE IRON PRODUCTS Ernst Thomas and Bruno Auriu, Hemer, Germany, said Auriu assignor to Thomas Application January 24, 1956, Serial No. 561,090

Claims priority, application Germany January 26, 1955 4 Claims. (Cl. 29-81) This invention relates to a method and plant for the continuous removal of the scaly matter from hot-rolled, bandlike iron products, which are drawn in the plant over guide rollers and over slide-bars provided with arcshaped slide surfaces, whereby the slide-bars and guide rollers are adjustably supported in their position and arranged with respect to one another in undulating orzigzag-like fashion, and whereby the scaly matter is loosened from the band-iron products by means of a slide-bar arranged in the vertex of a deflecting angle of the iron products.

According to the invention the removal of the scaly matter is facilitated and improved by the feature that band-iron of a thickness of 1 to 5 mm. is guided over the slide-bar at a deflecting angle which for band-iron of 1 mm. thickness is approximately 70 degrees and which for every additional mm. thickness increases at the rate of approximately 10 degrees; that the length of the radius of curvature of the band-iron as well as of the arc-shaped slide surface of the slide-bar is approximately five times the thickness of the band-iron; and that a portion of the scaly matter fed in by the moving band-iron between the slide surface of the bar and the band surface is crushed by the pressure between the slide surface and the band surface and thus utilized as a slide-promoting medium, and thereupon removed from the-band by means of brushes.

Because of the comparatively strong deflection of the band the surface of the latter is upset beneath the neutral zone, whereby the loosening process of the scaly matter is started. The thus loosened scaly matter is then crushed under high pressure between the especially hardened and wear-resisting slide surface or pressure-surface of the slide bar and the surface of the band. For this it is important that the pressure surface of the slide-bar is curved according to a comparatively small radius and that it is of comparatively small width. The are of the pressure surface positioned in the vertex of the deflecting angle is a very short one, so that a strong upsetting pressure and a considerable crushing of the scaly matter results, while, on the other hand, a sharp-edge deflection of the band is reliably avoided. At the same time, the short but strongly rounded-off arc ends of the slide surface of the slide-bar render it possible that a considerable portion of the scaly matter is drawn-in between the pressure surface of the bar and the band and thereby transformed into a powdery slide-promoting medium, whereby the removal of the scaly matter with the aid of brushes is facilitated without injurious effects to the surface of the band.

According to the invention the plant for the continuous removal of the scales from band-iron is; provided at the entering end of the band-iron with guide. rollers equipped with brakes; at the exit end of the band-iron with pull exerting rollers driven from a motor; and in the area between the aforesaid rollers with additional guide 70 rollers and with at least one slide-bar provided with means for its adjustment in height with respect to adjacent in its position. trivances. of this type may be arranged successively bewith an arc-shaped slide surface having its radius of curvature correspond in length to approximately five times the thickness of the band-iron, whereby the thickness of the slide-bar is at least equal to the length of the radius of .curvature of the slide surface, but smaller than twice the length of that radius. The invention further proposes to arrange the slide-bar exchangeably in a guide slot of a supporting body, and to provide the supporting body with means adapted to clampingly secure the slide bar According to the invention two conhind each other, so that the scaly matter can be successively removed from both of the faces of the band. The slidebar should preferably consist of hard metal.

' It has further been found that'the aforedescribed meth- 0d and plant are also well suited for producing, simula brake rollers at the entering end and the pull exerting rollersat the exit end of the plant a tensile stress in such manner that, with the aid of the slide-bars, the band is thereby stretched beyond its range of elasticity and thus reduced in thickness for 20 to 30%.

ln cases in which, in addition to the removal of the scaly matter, the band is to be stretched for a reduction of its thickness, the invention proposes to arrange in the plant a plurality of slide bars or pressure bars successively behind one another, that is to say, alternately on the upper surface and lower surface of the band, so that the band is pulled successively a plurality of times over such slide bars or pressure bars. In conformity with the reduction in thickness thus obtained, the angle of deflection is then adjusted in such manner that it is more acute toward the exit end than toward the entering end of the band. a v

For the production of considerable reductions in thickmess it is then possible to pass the band a plurality of times through the same contrivance or through a plurality of similar contrivances successively arranged bebe subjected to heat-treatment.

Additi'onal features and advantages of the invention will be understood from a consideration of the following detailed description taken in connection with the accompanying drawings, forming a part of this specification and in which an embodiment of the invention has been shown by way of example; However, we wish to say that the invention is not confined to any strict conformity with the showing of the drawings, but may be changed or modified, so long as such changes or modifications mark no material departure from the salient features of the invention as expressed in the appending claims.

In the drawings, in which like parts have been referred to by the same reference numerals in all of the several Fig. 1 is a central vertical section of a plant for the removal of scaly matter from band-iron, that is to say,

"Fig."4is"a* diagrammatic illustration, showing aplu- 1 Patented Nov. 24, 1959 rality of slide-bars or'pr'essurebars successively arranged behind"on'e"another'in zig-zag fashion between the brake rollers at the entering end and pull exerting rollers at the exit end of the band-iron; v M h Fig. is a detail view, on an; enlarged s'c'alef, showing a vertical cross-section through the upper end of the slide-bar p V v,

Referring now to the drawings in detail; the reference numeral l (see Figs. 1 and2) designates the bandfiron oi" sheet metal'riirin'ing' off a reel (not'illustrated in the drawings) and passing first between the" pair of feed rollers 2', of'which at least one is driven from a'motor; By means" of, these feed rollers 2 the band-iron is fed throu'g'li the brake rollers 3. In the embodiment illustrated" in the drawings the invention provides five brake rollers, some of which are'braked either directly or at their ends. These rollers simultaneously serve as a means for the straightening or flattening of the band-iron. In'the drawingthe'braking of the 'rollers 3 is effected with'the aid of th e' diagrammatically illustrated'braking means4. The brake power may. be adapted for adjustnient hj means of spring pressure. From these rollers 3 th'e band iron passes'into' the plant section 5 in which:

for the guidance of the band the rollers 6, 7, 8 and 9 are accommodated; Arranged between the rollers 7 and 8; one supporting body" 10, is a slide-bar'll; The suppor'tingbody ltl'isvertically adjustable" bymeans of the spindle 12. The rollers"-7 and 8 are adapted for adjustment in vertical direction by means of the spindles 13.- Positioned beneath the rollers'8 is a brush 14 driven from a'mo'tor 15. The band-iron 1' is guided via the rollers 6,17. 8,- 9' and'the slide-bar 11 in zig-zag-like fashion, whereby'it is importantthat the band, in dependence upon its thickness, is deflected to such an extent that between the tw'oband portions a and b an anglex is formed, which is'adapted for adjustment between' 70 'de'grees" and 120 degrees. Fromthepla'nt sec tion'5 the band-iron then passesinto the plant section 16in which the band is guided over a plurality'of rollers 17,' 18,".19; 20; 21 in'undulating" fashion; and whereby beneath

therollers

18 and 20 the brushes '22 and '23 are' arranged which are'driven from the motor 24. From the' plant'se'c'tion 16 the band passesinto the plant section 25." Accommo'dated "in this sectionare the motor-driven rollers 26 around which 'the'b'and passes in'such manner that the rollers 26 are thereby caused to pull the band through the entirescale-removing'plant; that is'to say, against the 'brake resistanceof the brake rollers 3.

The'device as illustrated in Fig; 1 serves the purpose of 'removingthe'scales from one face-of the baud. For

the removal of the'scales'from'the other'face'of the band the latter may be passed asecond time through the'contriva'nce 'of Fig. 1.- However, in thiscas'e, the

band haslto be turned 'firs't'through an angle of 180- degrees, so that the'sideofthe band which at'first was" downis then up. For the continuous removal of the scalesfrom both sides of the band; the latter has to suc-" ces'sively pass also through the contrivance shown in- Fig 2 of the drawings.

The construction of the portionof-l'th'e plant shown in Fig. 2 corresponds subst'antially" to the construction of the plant-portion illustrated in'Fig'.

1. The only diiferencebeing that in-the plant-section 27 the guide rollers and the brush-are somewhat differently arranged or adjusted," andthat the slide-bar or pressure bar 11 and its supporting body lll'are adjusted by'means ofathe upwardly extending .spindle 12, so that thepress'ure" oflthe barFll .is exerted upon the upper face of the bandiron, and th at the angle x formed by the band portions a and b is open in upwarddirectiori. The brush -14,- in

thiscase, ispositioned above the guide roller 8. Infthe plant-section 28 the brushes are likewise arranged above" the rollers, as in-this case the upper face of the band has to be brushed.

The slide-bars ll' arranged "in" the aforesaid warring sections 5.and.27 consist of hard metal and are provided with a slide surface 29 forming a section of an arc of a circle (see Fig; 5). The radius r of'this arc-shapedslide surface is approximately five times the length of the thickness s of the band-iron. The thickness y of the slide-bar 11 should exceed in length the length of the radius r, but should be shorter than" the double length of the radius. The slide surface 29 is at its ends likewise of curved formation and; therefore, merges without edges into the vertically extending side walls of the slide-bar. As shown in Fig. 3, the bar 11 is mounted in a recess 30' of thestationa'ry supporting body 10and secured in its position by the pressure exerted against it by a detachable bar 31 adapted'for tensioning' by means of screws 32. The .supporting body 10 is fastened by means of screws 33 on supporting means which, with the aid of guiding means 34 (see Fig. 1'), are shiftably adjustable in vertical direction in the machine frame. The slide-bar 11 is exchangeably supported between the supporting body 10 and the supporting and tensioning bar 31. The exchange of the bar is necessary whenever band-iron of a different thickness s has to be treated for the removal ofthe scales asin this case slide-bars of a different thickness y' and different slide surface 29 are needed. It will be seen that by means of the detachable and adjustable bar 31 slide-bars of-var ious thicknesses can be arranged in-therecess or slot30. I g

In the embodiment as hereinbefore described the removal of the scales from the band-iron proceeds as folthe surface of the slide-bar 11' arranged in the plantsection 5. The band, therefore, is continuously pulled in conformity with its adjusted feeding speed and at a comparatively small angle over the curved surface 29 of the bar11'1. The small are formed between the band portions a and]; is equally large as or slightly larger than the are 29, so that the scaly matter is fed by the movement of the band between the surface 29 and the inner face of the band. Because of the high pressure the scaly matter not yet separated from the band is crushed and thus serves as a slide promoting medium for the band in the small area of contact between the slide-bar 11 and the band. This powdery and now completely loosenedscaly matter can thereupon easily be removed by

the'brush'es

14, 22, 23 which the band subsequently passes, sot hata perfectly clean and completely uninjured band surface is obtained.

For carrying'out the invention-the following dimensions' are-preferably employed, whereby s is the thickness of' thfejband, r the radius of curvature of the slide-bar,

and-x theangle of defiectionof the band:

Fig. S shows clearlyfthat the bar 11 does not rest with any-sharp edge against the inner face of the band, and

that-the scalymatter is pulled or fed into a substantially wedge-like gap formed between the upper surface of the bar and the inner face of the baud, whereby the scaly matter is crushed and completely loosened from the hand, without injurious effect to; the inner face of the band.

The device as illustrated in Figs. 1 and 2 of the drawingsis also well suited for reducing, simultaneouslywith theremoval of the scales, the thickness s of the band iron. h Through alteration of the brake resistance of the rollers 3 and with the aid of a corresponding force of pull provided at the rollers 26 his possible to subject the band-iron in the area of the slide-bar 11 to such a degree of tensioning that a plastic deformation is proalso a uniform one. The scaly matter utilized as a slidepromoting medium facilitates the orderly operation of the device and prevents the band-iron from getting stuck at the bar 11.

For reducing the thickness of the band it is also possible to devise the plant as diagrammatically illustrated in Fig. 4 of the drawings. For this purpose the invention proposes to arrange in-the plant-sections 5 or 27 a plurality of slide-bars 11 in zig-zag-relation with respect to one another, so that alternately the upper face or lower face of the band is treated. In order to take care of the ensuing reduction in thickness of the band it is then advisable to arrange the deflecting means 11 in such manner that the angle x is more acute in the direction toward the pull exerting rollers 26, Le. that the angle x is smaller than the angle x.

What we claim as new and desire to secure by Letters Patent of the United States is: 1 v

1. A method for the continuous separation of scale from the surfaces of hot-rolled sheet iron band comprising guiding and pulling the sheet iron band in zigzag formation under tension over a stationary and adjustable curved slide surface, pulling the band over the curved slide surface at an angle having long legs and adjustable by moving the slide surface with the angle depending upon the thickness of the band and which is approximately 70 to 110 for a thickness of 1 to 5 mm., the crown width of the curved slide surface being in contact with the surface of the sheet iron with the radius of curvature only a few times greater in length than the thickness of the band so that the slide surface extends between approximately vertical side surfaces with the distance determined by the curvature radius of the slide surface, and this distance being at least thesame but smaller than double its radius of curvature, so that a part of the scale separated from the sheet iron will be drawn along the sheet iron and crushed between it and the slide surface and emerges from the slide surface, and finally removing the scale from the band surface.

2. A method for the continuous removal of scaly matter from the surfaces of hot-rolled iron according to claim 1, in which the step is included of imparting a tensile stress simultaneously on the band with the removal of the scaly matter to produce a reduction in thickness of the band by passing the band over said slide surface of the bar with such tensile stress that the band is thereby stretched beyond its elastic limit.

3. A method for the continuous removal of scaly matter from the surfaces of hot-rolled iron according to claim 1, in which the step is included of imparting a tensile stress simultaneously on the stressed band with the removal of the scaly matter to produce a reduction in thickness of the band by passing the band over said slide surface with such tensile stress that the band is thereby stretched beyond its elastic limit, and reduced in thickness in conformity with the adjusted degree of tensile stress by 20 to 30 percent.

4. Method for the continuous removal of scaly matter from the surface of hot-rolled iron bands, comprising pulling the bands under tension in zigzag formation over a stationary and adjustable arc-shaped slide surface with the surface forming an angle of deflection in the band relative to the vertex and adjusting the angle of deflection to approximately degrees for 1 mm. thick- .ness of the band increasing for every additional mm.

band thickness up to 5 mm. by approximately 10 degrees, and the radius of curvature of said slide surface corresponding in length to approximately five times the thickness of the band, utilizing the scaly matter created by the passing band as a slide promoting medium between the slide surface and the band and loosened and crushed to a powdery substance by the force between the slide surface and the band, and brushing and removing the powdery substance from the band.

References Cited in the file of this patent UNITED STATES PATENTS 988,712 Hughes Apr. 4, 1911 1,584,674 Smith May 11, 1926 2,116,980 Naish May 10, 1938 2,256,520 Johansen Sept. 23, 1941 2,318,432 Stanier May 4, 1943 2,335,196 Pecsok Nov. 23, 1943 2,359,095 Elder Sept. 26, 1944 2,391,499 Yoder Dec. 25, 1945 2,790,229 Hellstrom Apr. 30, 1957 FOREIGN PATENTS 1,632 Great Britain Jan. 22, 1904 10,618 Great Britain May 9, 1904 22,055 Sweden Nov. 2, 1905