FI65175C - VALSANORDNING - Google Patents

Description

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MA ^ (11) UTLÄGGNINGSSICRIFT 65 (75 c (45) Ρε!.? Γ.1 U -v "nr. * Lty ID 04 1934 l Patent oedlelat V v ^ (51) Kv.lkP / hK.CL3 B 21 B 13/20 FINLAND —FINLAND pi) ΜμΜΜιμμ · - PaMrtamttiiIng 7Θ2090 P2) HtkwnlspUvt — AmSknliigadag 29.06.78 (23) Alkupilvl — Giltlfhuttdag 29.06.70 (41) Tullut (ulkbuktl - Blhrft offwrtlig 02.01MM 02.01M

Patent and registration authorities AmMcan uttegd odi utl. * Kr1ft «n published 30.12.83 (32) (33) (31) Fyy4utty« tuolkuu »—Begird priority 01.07.77

England i-England (GB) 277 ^ / 77 (71) Hille Engineering Company Limited, Neepsend Lane, Sheffield S3 8DL,

The present invention relates to a rolling mill for reducing the cross-sectional dimensions of an elongate workpiece by providing a pair of rollers, England-England (GB) (72) Alexander Ian Wilson, Sheffield, Yorkshire, England-England (GB) (7¾) Qy Kolster Ah (5h) be in constant intermittent contact with the workpiece.

In particular, the invention relates to a rolling apparatus described, e.g., in U.S. Patent No. 3,643,488, comprising a first pair of co-operating rollers between which the workpiece is periodically contracted in a first constriction direction, a second pair of co-operating rollers between which the workpiece is periodically contracted in a second direction of constriction each roll having at least a partially frustoconical rolling surface for rolling the surface onto the workpiece and each provided with or connected to means for rolling the rounded surface on the workpiece and each roll being arranged on the support rotatably about its own axis of which the axes of the supports of the first pair of rollers run perpendicular to the axes of the supports of the supports of the second pair of rollers, and means for synchronously driving the brackets about their axes, with the rollers of each pair of rollers in each cycle approaching the Roll line and moving away again and the pairs of rollers alternately contacting and shrinking the workpiece periodically.

In the rolling apparatus of the aforementioned U.S. patent publication, the axis of each support is parallel to the axis of the roll supported by this support. The workpiece is thus rolled by each roll over a circular arc centered on the support shaft, the roll always remaining at the same level. When the workpiece is rolled into a circular shape, each roll forms a flat, double-wedged recess with opposite conical surfaces and the base of the recess is rounded to the desired cross-section. If the rolling device is used to roll the workpiece into a rectangular or rectangular position, sharp parallel angles are necessarily formed between the surface rolled by the first pair of rollers and the surface rolled by the second pair of rollers because the rollers are unable to enclose corners. Sharp angles are considered metallurgically bad.

In the rolling apparatus of DE 1,816,915, the axes of the rollers are inclined at an angle of 45 ° to the axes of their supports and each roll has a frustoconical rolling surface. It has only two roller supports, each of which supports one roller from one pair and one roller from the other pair, and whose support axes are parallel. The roller drive means is formed by a pair of counter-rollers which are driven around axes parallel to the support axes and with which the rollers come into frictional contact. As the brackets are rotated about their axes, the two Vals slips successively come into contact with the workpiece and make a periodic contraction on the workpiece in two mutually perpendicular directions.

Due to the frustoconical rolling surfaces of the rollers and the fact that the rollers of each pair perform circular movements about the same support axis, the workpiece is reduced to a rectangular shape, again with sharp corners, each formed between two mutually perpendicular workpiece surfaces. In the present invention, the axis of each roll is inclined with respect to the axis of rotation of the support on which it is mounted and each means for punching a rounded surface is arranged 3 65175 to roll the rounded surface at an angle between the rolled surface of the associated roll and the rolled surface of the other roll. The inclination of the roller axis relative to the support axis allows the means to follow and round the angle without interfering with the adjacent conical surface rolled by the second roller.

In a preferred embodiment of the invention, the means for rolling the rounded surface comprise an annular rolling surface in each roll extending perpendicular to the frustoconical rolling surface and intended to make the rounded surface a cross-section of the workpiece. However, the invention is not limited to such an arrangement, because the rounding of the angle can be performed by an additional angle roller supported by each roller support. Each roll can be made to roll a curved surface into a workpiece for the purpose of producing a circular shape.

The side line of the frustoconical surface of each roll preferably passes through the point where the axis of this roll intersects the axis of the support on which the roll is mounted so that the actual operation of the roll on the surface of the workpiece can take place.

The rolling apparatus of the present invention is primarily intended to strongly reduce elongated steel pieces, but can also be applied to workpieces made of other metal.

The invention is illustrated by the following description of a preferred embodiment of a rolling mill according to the invention, with reference to the accompanying drawings, in which Figure 1 is a side view of a rolling mill, Figure 2 schematically shows the use of one rolling bracket, Figure 3 is a partial axial section Figures 6 and 7 show a variant using rollless rollers, Figure 6 being an end view of the rolling mill support and Figure 7 showing the rolls with their stitching line, and Figure 8 showing the rolling of a slab.

The rolling apparatus illustrated in Figures 1 to 5 consists essentially of four rolling supports 12A, 12B, 12C and 12D, each of which is generally conical in shape. The four rolling supports are identical in structure and their parts are given the same reference numerals 4 65175 rot with the letters A, B, C and D, from which it can be identified to which the part belongs. The rollers rotate on shafts 13A ... 13D, which are also shafts of cones and which form the sides of a square. Each rolling bracket 12 has at least one rolling mill 14 (four rolling mills are shown in the drawings) which is independently rotated about a rolling mill 15 which is inclined with respect to the support shaft 13. If, as can be seen, each support has more than one rolling mill, the rolling shafts are divided at regular angular intervals around the support shaft.

The four brackets 12 are mounted on bearings in the four bearing supports 16 so that the bracket 12A is, for example, mounted on the bearings 16A and 16B and the bracket 12B on the bearings 16B and 16C. The bearing supports are attached to a frame formed by two separate straight frame parts welded to opposite sides of the supports 16 and supported by the vertical supports 18.

The rolling supports 12 are rotated synchronously about their shafts 13. Therefore, Figure 1 shows a common drive motor 20, which rests on vertical supports 18 and which drives four intermediate shafts 22A ... 22D via a flywheel 21. The shafts 22 are on a frame, separate from the shafts 13, and are connected by bevel gears 23A ... 23D. Each shaft 22 is connected to a respective reduction gear shown in Fig. 1 and schematically shown in Fig. 2 so that the shaft 22A has a gear 24A which communicates with a larger gear 25A which is on the same shaft as the gear 26A associated with the larger gear. which is fixed to the rolling bracket 12A. Thanks to the traction device, all four rolling brackets rotate at the same number of turns. The roll supports 12A and 12C rotate in stages so that the rollers come to a score line 28 perpendicular to the plane in which the support shafts 13 are located, simultaneously as shown in Fig. 1. The second pair of supports 12B and 12D rotate in the same phase, but are in a different phase than the supports 12A and 12C, so that successive pairs of rollers 14A and 14C alternate on the dotted line 28 with successive pairs of rollers 14B and 14D.

Figure 3 shows in part one of the rolling mill supports 12C in more detail and in particular the traction of the rolling mills 14C in that support. The figure shows the gear 27C as an annular gear, which is partially inside the bearing support 16C and which is locked in the support 5 65175 by a wedge 30C. The bracket 12C is mounted at one end on a bearing 31C in the support 16C and the other end is supported by a bearing 54C with a short shaft 29C extending from the support 16D. In two separate concentric bearings 32C and 33C, the bracket supports a roller drive shaft 34C that is concentric with the support shaft 13C. Shaft 34C has a bevel gear 35C locked to it by a wedge, which communicates with four drawn bevel gear wheels 36C, only one of which is shown in the figure, and which are attached to shafts 37C attached to a support. Each shaft 37C has a gear (not shown) which communicates with a gear 38C which is wedge locked to a roller drive shaft 40C mounted on a support and to the end of which one of the rollers 14C is attached.

The other end of the rolling mill drive shaft 34C is attached by a universal joint 41C to the connecting shaft 42C of the independent drive motor 43C. As the rolling mill drive shaft 34C rotates, it pulls four rolling mill shafts 40C in the rolling bracket 12C and thus the four rolling mills 14C via bevel gears 35C and 36C. The motor 20 simultaneously rotates the roller support 12C, about its axis 13C, via the transmission described above.

As can be seen in Figure 3, the center line 15C of each rolling shaft 40C is inclined with respect to the support shaft 13C at an angle equal to all rolling shafts 40 and slightly greater than 45 °. In addition, all four rolling shafts 15 in each rolling support 12 intersect at the position of the support shaft 13 at the point of intersection. As shown in Figures 1 and 3, each rolling mill 14 has a truncated cone-shaped surface 44, the side line of which passes through a point where the axis of the rolling mill intersects the axis of the support. At its inner end, each rolling mill has a collar 45 formed with an annular surface 46 transverse to the Vals saw shaft 15 and rounded at 47 so as to engage more softly with the surface 44.

The operation of the rolling apparatus for rolling a steel cross-section with a square cross-section into the shape of a bar will now be explained with reference to Figs. In those figures, the workpiece, the blank to be reduced to a rod, is denoted by the number 50. The friction rollers (not shown) force the workpiece along the rolling line 28 at a low, continuous speed in the divided direction. The rollers of each rolling bracket turn into contact with surfaces 50A, 50B, 50C or 50D

6 65175, moving in the opposite direction to the workpiece during contact.

Because the rollers of the opposing roll supports 12A, 12C, or 12B, 12D move in stages, as described above, the rollers 14A and 14C reach the rolling line simultaneously and work together to shrink the front end of the workpiece between them, on the wheel surfaces 50A and 50C. Each rolling axis 15 follows the surface of the cone as the respective support 12 rotates about its axis 13, so that the rolling follows a circular path first touching a reduced point of the workpiece at a minimum distance from the interacting roll the workpiece dimension is at its maximum. At the same time, and since the shaft 13 is inclined with respect to the rolling shaft, the collars 45 of both rolling mills pivot apart.

The order of the periodic contractions performed by the rollers is as follows: 1. Assuming that the workpiece is partially contracted, as shown in Figures 4 and 5, a cooperating pair of rollers 12A and 12C contacts the workpiece at its contracted point and as the rollers roll along surfaces 50A and 50C, the rolling surfaces 44A and 44C add those surfaces of the workpiece.

2. Simultaneously, the surfaces 46 of the rollers 14A and 14C roll the edges 51A and 51C on the workpiece with the result that the points 47 of the rollers round these edges.

3. A pair of rollers 14A and 14C are followed by a pair of rollers 14b and 14D of supports 12B and 12D, in Figure 5, which operate in the same way with respect to the workpiece but on surfaces 50B and 50D, at right angles to surfaces 50A and 50C so that collars 45B and 45D round edges 51B and 51D. Due to the inclination of the rolling shaft relative to the support shaft, the rolling surfaces 46B and 46D are followed by the diverging surfaces 50A and 50B of the workpiece formed by the rolling mills of the supports 12A and 12C in the previous rolling step. Rollers 14B and 14D differ from contact with the workpiece 50 at a point that has shifted in the opposite direction of workpiece movement from where the previously operated rollers 14A and 14C disengaged, an amount that depends on the amount of workpiece movement forward between successive rolling steps.

7 65175 4. The pair of rollers 14B, 14D is in turn followed by the next pair of rollers 14A, 14C of the roll supports 12A, 12C and, as before, the latter rollers further reduce the surfaces 50A, 50C.

The workpiece 50 is thus further reduced alternately on the surfaces 50A, 50C and 50B, 50D so that the edges of the workpiece 51 are rounded after each further contraction and the workpiece is reduced to a continuous bar having a square cross-section but rounded longitudinal edges and substantially smaller cross-sectional dimensions than blank.

In order to adjust the dimensions of the rolled bar, each bracket 12 is mounted eccentrically. Thus, the bearing 31C, in Fig. 3, is supported by a ring 53 mounted eccentrically on the support 16C and the second bearing of the bracket is similarly mounted on an eccentric fitting 52 located on the short shaft 29. By changing the angular positions of the ring 53 and the fitting 29 , 14A and 14C or 14B and 14D, the minimum distance from each other can be changed, and in this way the dimensions of the rolled square cross-section or the bar or the rectangular cross-section of the bar can be varied. When the roller support 12 is adjusted, its ring gear 27 moves tangentially to its traction wheel 26, but remains in contact.

The purpose for which each support shaft 13 is inclined with respect to the axis 15 of each rolling mill of the corresponding support is similar. For example, if the support shaft 13 were parallel to the rolling shaft, the collars 45A, 45C in Fig. 4 would not diverge during each rolling step and would interfere with the diverging surfaces 5OB and 50D of the reduced workpiece. Tilting the shafts causes the collars to follow the paths that are the same as the surfaces 50B, 50D on which the surfaces 46A, 46C roll. Due to the fact that the profiles of the surfaces 50A, 50C are similar to the profiles of the surfaces 50B, 50C, the angle Q between the support axis and each rolling axis should be about 45 °. However, since each cooperating pair of rollers 14A and 14C or 14B and 14D, begins and ends its further contraction steps on the workpiece at points different from the points of the previous pair of rollers 14B and 14D or 14A and 14C, respectively, the angle is preferably slightly greater than 45 °. The final angle depends on the speed of the workpiece, but an angle of 46 ° 20 'has been found to be suitable.

65175

Although the use of four rolling mills per support has been described and illustrated herein, the number of rolling mills may vary depending on the requirements. For example, six rolling mills can be used if high production is required, with typical maximum values for four and six rolling mills of 100 and 150 tons per hour, respectively, and maximum billet speeds of 0.16 and 024 m / s, respectively. The maximum fit in one run of the rolling mill is 93%.

The rollers 14 rotate about their axes at speeds proportional to the rotational speeds of the supports to advance the workpiece 50. The friction rollers acting on the workpiece ensure forward movement, especially during the rolling intervals of successive pairs of rollers and at the beginning of rolling.

The reduced rod is metallurgically satisfactory because it has no sharp longitudinal edges that would be formed if there were no collars 45.

The rolling apparatus described above can be converted in various proportions. Thus, the support shafts 13 are in the normal plane of the workpiece of the described device. Instead, one or both of the opposite axes, 12A and 12C or 12B and 12D, may be in a plane slightly inclined with respect to the normal plane of the travel.

Second, the rollers 14 can be made without collars 45, with each roll 14 being cylindrical and preferably provided with a frustoconical surface. When rollless rolls are used, each roll support has, in addition to the rollers 14, a corresponding number of leveling rollers 55, in Figures 6 and 7, which may be drawn but which preferably rotate freely. Each roller 14 is followed, in its immediate vicinity, in the direction of rotation of the support 12, by a leveling roller 55, as shown in Figure 6, and each leveling roller is mounted so as to roll the edge 50A ... 50D rolled by the previous roller 14 and have a rolling surface 56 in Figure 7. , to round the edge 51. Fig. 7 shows collarless rollers on a rolling line with corresponding leveling rollers 55A and 55C rolling rounded edges 51A and 51C in Fig. 4. The figure also shows the second pair of rollers 14B and 14D in dotted lines when they are in the Vals dry line, but not their leveling rolls.

The rolling device can be used to roll non-square cross-sections of 9,65175 if the profile of the rollers 14 is suitably changed. Thus, round cross-sections can be rolled by smoothing the curvature of the rounded portion 47 in Figure 3 and increasing the length of the portion. Slabs, i.e. cross-sections with a large width compared to the thickness, are rolled with collarless rollers 14A, 14C with wide surfaces and with collarless rollers 14B, 14D with narrower surfaces as shown in Fig. 8. The support shafts 13B, 13D have been moved from the position indicated in Fig. 1, so that their minimum distance from each other is, as can be seen, substantially greater than the minimum mutual distance of the rollers 14A, 14C. As in Figures 6 and 7, each roller 14 is followed by a leveling roller 55 to round the edges of the workpiece 50.

When a rectangular cross-section of the rolled workpiece is desired so that the width is slightly greater than the thickness, rolled rollers can be used, as in Figures 1 and 3 ... 5, changing if necessary the axial position of the rollers so that the rollers of said rollers properly follow the workpiece edges. The same way of thinking can be applied when rolling oval cross-sections.

Claims (6)

10 65175 A rolling apparatus for reducing the cross-sectional dimensions of an elongate workpiece (50) movable along a rolling path (28), the apparatus comprising a first pair of cooperating rollers (14A, 14C) between which the workpiece is periodically contracted in a first direction, a second pair of cooperating rollers (14B, 14D) the workpiece is periodically contracted in a second direction perpendicular to the first direction, each roll (14) having an at least partially frustoconical rolling surface (44) for rolling the surface onto the workpiece (50) and each provided with or connected to means (45 or 55) to roll the surface onto the workpiece and wherein each roll (14A ... 14D) is arranged on the support (12) to rotate about its own axis (15) and the supports (12) are rotatable about different support axes (13) perpendicular to the rolling line (28), of which the shaft of the brackets (12A, 12C) of the first Vals cigar (14A, 14C) lit (13A, 13C) run perpendicular to the axes (13B, 13D) of the supports (12B, 12D) of the supports (12B, 12D) of the second pair of rollers (14B, 14D), further means (43) for driving the rollers (12) about their own axes (15) and means (20) ) for synchronous operation of the supports (12) about their shafts (13), whereby each pair of rollers (14A, 14C; 14B, 14D) the rollers in each cycle approach the rolling line (28) and each other again and reciprocate and the pairs of rollers alternately contact and contract the workpiece (50) periodically, characterized in that the shaft (15) of each roll (14) is inclined to support it. (12) relative to the axis of rotation (13) and that each of the means (45 or 55) for rolling the rounded surface is arranged to roll to the edge (51) of the rounded surface between the rolled surface of the respective roll (14) and the rolled surface of the other roll. Rolling device according to claim 1, characterized in that the side line of the frustoconical surface (44) of each roll (14) passes through the point where the shaft (15) of this roll intersects the shaft (13) of the support (12) into which this roller (14) is attached. Rolling mill according to claim 2, characterized in that the means for rolling the rounded surface consist of an annular rolling surface (46) in each roll (14) running perpendicular to the frustoconical rolling surface (44) and which is formed to provide a rounded surface on the cross section of the workpiece. Rolling device according to Claim 3, characterized in that the annular rolling surface (46) is a collar (45) which is an integral part of the roll (14). Rolling mill according to claim 1 or 2, characterized in that the means for rolling the rounded surface of each frustoconical roller (14) comprise an additional edge roller (55) supported by each roller support (12), rolled by the roller (14) of this roller support (12). to round the edge of the surface. Rolling device according to one of the preceding claims, characterized in that the shaft (13) of the roller support intersects the rolling shaft (15) at an angle of approximately 45 °. 12,651 75