Патент USA US2126509код для вставки
f Aug. 9, 1938. J. SEVERIN 2,126,509 TUBE ROLLING MILL Filed Nov. sa, 1954 A § l `\~ 2 Sheets-Shea?J 1 f f Aug. 9, 1938. J. SEVERIN Y Filed Nov. 9, 1934 . fîyá' Z . Í 2,126,509 TUBE ROLLING MILL A 2 Sheets-Sheet 2 2,126,509 Patented Aug. 9, 1938 UNITED STATES PATENT ori-‘ICE 2,126,509 'rUnEaoLLma Mns. ,me Severin, Maximin-num, omar, animar to Deutsche Böhrenwerke Aktiengesellschaft, ` Dusseldorf, Germany Application November 9, 1934, Serial No. 752,281 ln Germany November 25, l1933 s claims. (Cl. 8F13) It is known to producetubes from hollow bil lets by stretching the billets-chiefly in the axial direction-by means of rolls the axes of which> are at an angle to the axis of the hollow billet 5 and whose path of travel on Vthe outer and inner faces of the hollow billet is 'of helical- form; the ing operation. Even when the rolls in the an nular roll frame are not driven by spindles from the gear roll frame disposed on the same'axis, but laterally, considerable difliculties are en- _ countered in the returning of the rolled material; 5 these difliculties are caused by the operatives' rolls of the set of rolls around the periphery> of working on the rolling mill being obliged to re- _ the hollow billet are successively profiled in such l set the inside and outside rolls required for `the manner that each succeeding vroller further 10 treats the section'of hollow billet already treated by thek preceding roll. In these processes the outer rolls alone effect the shaping, while, in the interior of the block, a mandrel or smooth roll serves as a support, or alternatively rolls on the 15 inside take part in the shaping operation o? per next passage after each passage through the mill. ' ` ' rolled through ,the rolling mill itself there is a further passing through of the material in the » opposite direction; thus -:l’or example a method 15 form it alone, while the outer rolls act as a is known in which the rolls of an inclined roll smooth support. ing mill as ordinarily employed for piercing solid . The various kinds of shaping which are car ried out by the profiled rolls differ in two princi 20 pal respects. In one group the profiled rollers veiîect an operation known from the time of forg ing by the term “reduction by lowering" in which grooves are pressed into the billet by the first pair of rolls, so that a part of lthe blank is 25 reduced ln diameter vtowards one end of the hol low billet; the part in question being widened smoothly towards the end .by shoulders on the succeeding rolls which at the same time spread the metal while sometimes making deeper the 30 groove which has been formed in the metal by the ñrst pair of rolls. In the second method the hollow billet is shaped by rolls profiled conieallyJl or smoothly or formed pointed ln steps, in a manner corresponding to a drawing operation. 35 In- the known processes the material being rolled is passed into the rolling mill on one 10 Methods of producing tubes are known in which after each passage of the material being cylindrical billets are so provided that certain of the rolls cause the piercing while the ma, terial is passing through the rolling mill in one 20 direction while during the reverse movement, after the change of direction of the rolls, the re maining rolls cause the material which has been pierced while travelling in the original direction to be stretched, whereby the walls of the tube 25 produced are reduced in thickness and its length increased. Another known process, which makes useV of the known conical roll discs for the in- ' tended shaping of the material being rolled effects the to-and-fro movement of the rolled material 30 by using guides'which are so provided that in one case -the material being rolled is guided to the discs above their centre of rotation while in the other case the feed is effected below the centre of rotation of the s which effect the 35 change of shape, and thus the direction of roll side--the "entry" side-until it isV gripped by the ing is reversed without the reversal of the direc rolls and then driven through the rolling mill tion of rotation of the shape-changing discs. by them. The blank leaves the rolling mill on the ' These known methods for changing the di 49 “discharge’ side, and if it is to be passed through rection of rolling cannot beemployed for the 40’ the rolling mill a second time, it must again be processes hereinbefore described in the second carried back to the entry side before it can again paragraph, because in these processes the re pass through the rolling mill. This conveying of the billet from the discharge side to the entry 45 side is attended with diiiiculties and disadvan `tages. The rolling mills employed for carrying out the processes hereinbefore referred to are usually provided with a ring-shaped roll frame which carries the outer rolls that are driven by 5o spindles from a gear roll frame whose axis lies in alignment with the axis of the roll frame. turning of the material being rolled` cannot be, made possible solely by`reason of the fact that the .rolling mill is run in the opposite direction. For 45 in these processes herelnbefore referred to the rolls are so profiled that the rolls whichfflrst come into action during the ‘hrst passage of the material through the rolling mill grip the work by their shape-changing parts, the hollow blankV 50 I having its -original thickness, while the shape? changing parts of the other rolls are unable to These spindles hinder the blank from being re turned to such a degree that the heated blank function correctly until the'preceding rolls have f cools considerably, which is la distinct disad-v already carried out part of the shape-changing 55 vantage in connection 4with thesubsequent roll operation.` During the reverse movement -of such 56 , 2,126,509 a rolling mill the shape-changing parts of the rolls that were last operating during the forward ‘ movement would be the ilrst to grip the material. They would then be so heavily loaded that the rolling mill would break or the billet would not be properly treated. - It is proposed according to the Ainvention to entry side in the anti-clockwise direction, that ~is to say the material rotates in one direction in re lation to the direction of passage of the tube through the‘ mill. The direction of the return movement is indicated by dot-and-dash arrows. In order to bring into use the passes Ki, K2, K1, K4, K5, Ks, or K’i, K'z, K’J, K'4, K's, K’s in the ' ron the billet in been directions through rolls requisite manner and at the right time lfor the with two passes, which correspond to the se _ shaping operation the working rolls are provided 10 quence in the forward and rearward movements, the rolls whose first passes are operative in the forward movement being rocked after the for ward movement, through such an angle that the ' second passes provided for the return movement come into the working position. The reduction in the thickness of the material being rolled, which has been obtained as the result of the ñrst passage through the rolls must be taken into ac count when determining the calibration of the return movement. The two passes of the outer and inner rolls, or only of the outer rollers or only of the inner rolls can be set singly, it being possible for each of the rolls with two passes to »be replaced by two rolls each adapted to be pro 25 illed individually. l Apparatus according to the invention is dia grammatically illustrated by way of example in the .accompanying drawings. Y Figure 1 illustrates in longitudinal section a 30 `roller mill with inner and outer rolls- which are capable of being rocked out of alignment. Figure 2 illustrates asimilar rolling mill withl inner rolls only which are capable of being thus moved. Figure 3 illustrates a similar rolling mill with outer rolls only which are capable of being thus moved. Figure 4 illustrates a complete tube rolling mill, with setting devices for rocking rolls B. Figure 5 illustrates the mandrel head of a roll 40 ing mill provided with pairs of rolls each sepa 85 to be capable of rocking that is to say the outer and inner rolls in Figure l only the inner rolls in Figure 2, and only the outer rolls in Figure 3. 'I'he rocking angle here corresponds to the depth of the depression. The pivotal points about which the rolls are rocked in the examples illus 15 trated in Figures l to 3 are outside the rolls on the original entry side. They may, however, be otherwise selected, that is to say they may be inside the rolls themselves or at any other posi tion according to the change of shape desired or 20 type of rolling mill employed. An example o1' this is illustrated in Figure 4. In the constructions shown in Figures 2 and 3, in which only the inner or the outer rolls vare rocked, the material being rolled moves the ilrst 25 time it passes through-that is in- the direction indicated by the full line arrow as in the example according to Figure l freely through the second pass without contacting with it. In the return movement of the material from the original dis 30 charge side in- the direction indicated by the arrow in dot-and-dash lines, the passes K1 etc. ‘formed by the rolls and their non-rocking coun ter rolls become operative after the rocking of the inner or outer rolls, by reason of the fact that the rolls to be rocked are rocked not only to the extent indicated in Figure 1 but beyond this to such a degree that an increase or reduction is obtained in the diameter of the material by rea son of the coning or entry of the inner and outer 40 rolls, as will be seen from the dot-and-dash lines rately calibrated. . at F. Figure 2 illustrates a different roll pass Each of the Figures 1 to 3 of the drawings il from that shown in Figures 1 and 3. lustrate a rolling mill provided with a circular 'I'he inner rolls are secured to the mandrel E 45 series of six pairs of rolls with the shaping parts' in knownmanner by means of a roll head D. operating on single helical lines when rotating in As will be seen from Figure 4. the outer rolls 45 the clock-wise direction. Where it is advisable, ` B are mounted to rock in bearings H and in siml for the sake of cleamess, only to show in the lar manner the inner rolls C are mounted in drawings two pairs of rolls, the remaining rolls bearings J. 'I‘he bearings for the inner rolls are are indicated in the-following description by ref, capable oi' rocking by reason of their spherical erence letters that do not appear on the draw supporting base. 'I'he rocking movement as such ings. Thus,.outer rolls may bepresumed to vbe can be obtained by a very large number of known . numbered B1', lBz, Ba, B4, Bs and Bs and of these machine elements. Bi and B4 are shown in the drawings and the in Figure ârillustrates a modified construction of ner rolls may similarly be considered to be num the roll head D which is provided with a support bored Ci, C2, Ca, C4. Cs, Cs and 0f these Ci and C4 for the inner rolls C at the middle position, each 55 are shown in the drawings. The material A en of the inner rolls being divided into two rollers ters the iirst pass in the direction indicated by each having a separate pass. This arrangement the full line arrow. The parts of the rolls which has the advantage that rolls or roll spindles of operate on the entry side are numbered Krl K2, small diameter may be employed just as might 60 K1 K4, Ks and K4, of which K1 and K4 only are possible with undivided rolls on account of shown in they drawings, the pass K1 functioning be their length. ' ‘ during the tlrst passage of the material while the I claim: pass Ks is operative last of all. In addition to 1. A rolling mill for producing tubes from hol 65 these passes each roller is provided with passes list K’i, K’z, K'a, K’4, K's, and K'a, K': and K’a only being shown. K'1 being formed by the rolls which . form the pass Ks in the direction of the original en_try side and the pass K'a being-formed by the 70 rolls which form the pass Ki in the direction of the original entry side. If during the `ilrst pas sage the material being rolled is rotated from that position which may be termed the original entry side in the clockwise direction, it must in 75 the return movement be rotated from the original low billets by stretching, particularly in the axial direction, and comprising several sets of inner and outer rolls, the inner and outer units of which have their axes lying inclined to the path of travel of the hollow billet and are adapted to op’erate respectively upon the outer surface and the inner surface of the hollow billet by grooving the mate rial on helical lines and widening the groove, the rolls of the several sets of rolls which successively operate upon the billet being formed with passes related in such manner that every succeeding roll 75 i einem@ sets oi rolls include sets of which one roll is of fixed position and is of a form such that the set acts upon the part of »the hollow billet which has already been acted upon by the preceding roll set, and Ineens whereby the mill is adapted for rolling the hollow billet in both directions of travel through it, the said means consisting of passes provided upon the units of the several sets of rolls, required pass comes into operation according tg the direction of travel of the hollow billet, and a second roll is adapted to be adjusted to render the two passes of the said rolls alternatively oper ative, the said rolls being provided with means for eilecting the required adjustment. certain of which passes are eiïective in one direc tion of travel of the hollow billet and certain of which passes' are effective in the reverse direc tion oi travel oi the hollow billet, the passes for the reverse direction of travel being formed and positioned to continue the working of the billet carried out by the passes that are operative in the forward direction oi travel of the billet and the rolls of each set of rolls being rotated in the reverse direction of rotation for the return direc tion of travel of the billet. , 2. A rolling mill according to clnlm 1, having, included in the sets oi' rolls, rolls hoi/ing passes which are operative respectively in the two direc« tions of travel of the hollow billet end ineens whereby the axes of the rolls may be roclred- to bring the pass required into operative position. 3. A rolling mill according to c l, wherein . i. A rolling mill according to claim 1,v having. included in the sets of rolls a set oi.` rolls which are operative for the one direction of travel oi the hollow billet and other sets of rolls which are operative for the return direction oi travel of the hollow billet. . 5. A rolling,r mill according to claim i, wherein 15 the sets of rolls are provided to include sets oi‘v rolls of which one roll is formed with passes which are alternatively operative according to the direction of travel oi' the hollow billet and other rolls which are alternatively operative ac 20 coi-ding to the direction ofv trnve’i oiîfthe hollow billet «eo-operate respectively with the posses oi the st roll. JOSE SEVF’RÍN.