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Attorney Aug Aug. 7, 1951 C. R. CROSON 2,563,214 PIPE MAKING MACHINE Filed Feb. 4, 1946 10 Sheets-Sheet VA reV ar () v O um S. INVENTOFR attorney Aug. 7, 1951 C. R. CROSON 2,563,214 - --" PIPE MAKING MACHINE --- ul Filed Feb. 14, 1946 --- 10 Sheets-Sheet 2 FI is 5 (44 222nINVENTOR zamiya37 Prézz/at OrNEY 63. - 4O . --- ------ - - - - . - - - - - - - C Jazz 2 & 222 4. 21 S A2 2. b e 372. 4. 34 - 37.2 Aug. 7, 1951 C. R. CROSON 2,563,214 e I-1 3. Aug. 7, 1951 C. R. CROSON 2,563,214 PIPE MAKING MACHINE Filed Feb. 4, 1946 10 Sheets-Sheet 7 Er 1E ( ) 37e : 22. , by 46A/AT TOFRNEY Aug. 7, 1951 c. r. croson 2,563,214 v PIPE MAKING: MACHINE Filed Feb. 14, 1946 l0 Sheets-Sheet 8 inWENTOR ATTOFRNEY Aug. 7, 1951 C. R. CROSON 2 563,214 PPE MAKING MACHINE Filed Feb. 14, 1946 l0 Sheets-Sheet 10 ?s No. =======ø2. INVENTor A TORNEY Patented Aug. 7, 1951 2,563,214 UNITED STATES PATENT office 2,563,214 PPE-MAKING MACHINE Clyde R. Croso, Wheeling, W. Wa. Application February 4, 946, Serial No. 64,503 5 Cairns. (C. 8-88) 2 This invention relates to machines for making Fig. 3 shows the form of the skelp as it passes welded tubes from fiat skelp. the rolls illustrated in Fig. 2; By methods heretofore employed, tubes of large Fig. 4 is a CrOSS-Section of the mill taken sub diameter have been made by first forming the stantially on the line 4-4 of Fig. 1, and show skelp into unwelded tubular form, then reheat ing, in end elevation, the first forming or break ing the tube in a furnace to proper Welding tem down roll and its opposed anvil, and also show perature, after which the unwelded tube. is with ing, in dotted cross-section, the skelp in position; drawn from the furnace and passed between Weld Fig. 5 shows the form of the skelp as it passes ing rolls and surrounding a ball of appropriate the roll illustrated in Fig. 4; diameter held between the welding rolls upon the O Fig. 6 is a cross-Section of the mill take sub end of a long rod. After the tube is So formed, Stantially on the line 6-6 of Fig. 1, and showing, the ball is dropped from the rod and the latter in end elevation, the first pair of forming rolls, is withdrawn from the tube. In that method and also showing, in dotted cross section, the it has been found that when tubes of 19.ge diame skelp in position; ter are formed, say twelve inches and more in 5 Fig. 7 shows the form of the skelp as it passes diameter, if the tube is very long, say in excess of the rolls illustrated in Fig. 6; twenty feet, the unwelded tube tends to collapse Fig. 8 is a cross-section of the mill taken sub or the abutting or lapped edges to fall apart when Stantially on the line 8-8 of Fig. a showing, in it is reheated before welding. The present in end elevation, the second dumb-beil roll with its vention is designed to overcome those difficulties, 20 opposing anvil, and also showing, in dotted cross and to enable pipe of larger diameter and greater Section, the skelp in position; lengths to be formed. Also when the unwelded Fig. 9 is a cross-section of the skelp showing tube is so reheated to Welding temperature--a the form it assumes upon passing under the roll temperature which tends to cause the metal to illustrated in Fig. 8: flux impurities rolling down the sides of the tube 25 Fig. i0 is a croSS-Section of the mill taken sub sometimes cut peripheral ridges both inside and stantially on the line O-O of Fig.1, and show outside the unwelded tube-ridges which are not ing, in end elevation, the second pair of form eliminated in the Subsequent Welding process. ing rolls, and also showing, in dotted cross-sec Such ridges are sometimes called "liquor marks.' tion, the skelp in position between said rolls; Furthermore, when the tube is later welded, the 30 Fig. 11 shows the form of the skelp as it passes cinder-like impurities which formed inside the the rolls illustrated in Fig. 10; tube are caught by the ball and drawn length Fig. 12 is an end elevation of the third pair of wise through the tube, scratching or cutting longi forming rolls illustrating in cross-section a por tudinal channels along the interior Walls of the tion of the mandrel shown in Fig. 18, and also, tube, sometimes called "ball cuts.' The present 35 in dotted cross-section, the skelp in position be invention is designed to produce heavy gauge tween Said rolls; pipe of large diameter which will oe free of Such Fig. 13 illustrates the form of the skelp as it "liquor marks' and "ball cuts.' passes the rolls shown in Fig. 12; Another object is to provide a machine for Fig. 14 is a forward end elevation of the Weld making welded pipe or tubes of heavy gauge 40 skelp, the weld seam of which will be free of pits ing rolls, showing, in cross-section, a portion of or faults fron Scale or impurities, and of ridges, the mandrel illustrated in Fig. 18, and also show bulges and other irregularities in the pipe walls ing, in dotted cross-section, the skelp in position, along the Weld Seam. Which has now become a tube; A further object of this invention is to form Fig. 15 illustrates the form of the tube as it fiat skelp into tubular form for welding with enters the rolls shown in Fig. 14; a minimum reduction in the thickness or gauge Fig. 6 is an end elevation of the delivery rolls, of the Skelp. showing the tube, in dotted cross-section, gripped Other objects and purposes will appear from between the rolls; this specification and from an examination of 50 Fig. 17 is a cross-sectional view of the welded the accompanying drawings, in which tube as it passes through the rolls illustrated in Fig. represents, in diagram, a side elevation Fig. 16; of a mill or machine embodying my invention; Fig. 18 is a side elevation of the mandrel which Fig. 2 is an end elevation of the first pair of extends through the rolls illustrated in Figures rolls, showing, in cross-section, a slab of skelp 55 12 and 14; gripped between the rols; Fig. 19 is a cross-section of the same taken 2,563,214. S3 4. through the trunnions upon which it is mounted; passing the roll 4, the skelp has been bent into and Substantially the form shown in Fig. 9. Figures 20, 21 and 22 are cross-sections of said To the rear of the anvil 4 there is mounted mandrel, taken respectively on the lines 2-20, upon the foundation if a housing SI in which is 2-2 and 22-22 of Fia. 18. journaled a pair of rolls S and S2. Upon leaving In describing my invention in detail, refer the rear horn of the anvil 4, the hot skelp is ence will be made to said drawings by reference gripped by the last-mentioned rolls by which it is numerals which distinguish like parts throughout bent into substantially the form illustrated in the several views. Fig. 11-that is, inverted-U shape. In addition The various parts of my invention are mounted O to imparting to the skelp the additional flexion upon a foundation 3. Standing upon said foun necessary to give it the form just mentioned, the dation at the forward end thereof is a housing rolls 5 and 52 are power-driven so as to assist 32, in which is horizontally journaled a pair of in forcing the skelp through the machine or mill, rolls 3 and 34 of ordinary cylindrical construc and for the latter purpose the skelp 37d is gripped tion, designed to be geared to a driving mecha s between that portion of the surface of the roll 52, nism (not shown). Likewise mounted upon the indicated by the numeral 52a, and the corre housing 32 forward of the bite of the rolls 33 and sponding surface of the roll S, the roll 2 being 34, by means of a pair of brackets 35 is a table recessed at 52b so as to leave a portion of the 36 designed to receive the approaching skelp 3 skelp ungripped as it passes between said rolls. (which has been heated to forging temperature 20 Manifestly, the skelp will be thinned through in a furnace which is not shown) and direct it Out that portion thereof gripped by the various into the bite of the rolls. Mounted upon the opposing rolls between which it passes, and, table 36 near each side is a guide member 8 therefore, in order that a substantially uniform designed to center the skelp as it approaches the thickness of the skep may be maintained, the por rolls 3 and 4. Said rolls are intended not only 25 tion of the surface of the skep gripped between to assist in driving the skelp through the ma the unrecessed surface of the roll 52 and its op chine, but also to assure its being of substantially posed roll S is intended to correspond with the uniform thickness as it passes said rolls.
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