CZ516686A3 - Reciprocating rolling process, drawing and coiling of long tubes and apparatus for making the same - Google Patents

Abstract

The invention relates to a method for the cold forming of long-length tubes in a rolling mill with a roll stand that moves backwards and forwards and has grooved rolls mounted in the latter, with stepwise advance and rotation of the tube in the region of one or both end positions, the alternate rotation being of equal magnitude for each direction and the cyclical, non-uniform speed of the rolled tube being converted into a constant exit speed in a buffer zone in which the tube is deflected out of the rolling direction. In order to reduce the outlay on equipment hitherto required with such methods and to achieve a significant increase in output, the invention proposes that, downstream of the buffer zone, the tube should be cold-drawn with an at least 25% reduction in cross-section and coiled in a continuous operation, even while it is being rolled.

Description

(57) The rolling, drawing and winding of tubes is carried out in a single operation in a rolling mill with a reversing mill and the calibration cylinders located there, with a rotating device (4) in the range of one or both dead centers, further with damping (5) to compensate for cyclically unequal speed to constant speed as well as with the bending device, which is a drum pulling machine (7).

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Tynález; se? concerns. way, pilgrim-rolling, pulledVaT “” ’*. winding of tubes of long length in a rolling mill.

porter, rolling, mill and taxu- SITUATED AS * kalibrevacimi beam / or "and. uosuvém forward and · turning, oven -rozsahu. one ·. · or, o. ¹ 1 ,, the dead center potent přerušovaně-, · wherein - the relative rotation is always according to the direction; equally large and ecyclically uneven; the speed of the rolled tube is converted in the damping zone, deflecting the tube, the direction, the rolling, to the. constant run-off speed a. the oven winds up and the sex is related to the damping area. equipment for carrying out the method.

The method of this; the species is known from; nemm. BE - OS publication 51,284 ·., Bale. is, according to him.

BE) - BS '8.41 896, known as pilgrims. rolling of tubes in one continuous, working process, from and cold.

Exemption eg. network for klaďer ~ ^T ~ 'UKo-l-yl-VQ-t-it ^ ^ .způ.3Ob previously mentioned.

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<} type, as appropriate; devices so - to the extent of deformation of the cross section, the oven could also be in a substantially single step, to enlarge .sen ·· - ¹

Bento; the task is solved by way of pilgrimage · rolling, · drawing · * in and winding .trub? of great length (eg) the essence is that the ..

- l ⁽ it I '''' -trouba ςς; ταa. *** ·}. <in the same working, immediate operation) os4 “t 46x0 ** <-co ^. ^ Adjustment. k, the implementation of the method consists of handcuffs. The cold-rolling mills with the apparatus, for the o-rings of the range, act either or both of the dead centers. z: buffer damping area.

cyclically non-uniform; speed on. constant, speed; The bending device according to the invention is characterized in that a drum-type drawing machine is provided as the bending device before which it is preceded. the device, that is, caught, thorn deposit. o Oven lubrication- Advantages · achieved by the invention; podatsfev consist in that. the * • - _t is yjf- provide improved performance · ca .. 25 * C s = 5.0> depending · reduction in pull; The machine according to the invention corresponds to the same rolling mill equipment without cold drawing equipment. and when the cross sections of the tubes produced are unequal. Here she is. possibility; use larger cross-sections of tubular, semifinished products and the greater the tubular weight of the semifinished product at the same lengths of tubular semifinished product ... Larger cross-sections of the tubular blanks are advantageously increased in proportion to the extrusion diameters. Ltd. for the production of tubular. semi-finished products .. ·

At. the use of tubular billet cross-sections, as anticipated by the state of the art, the elongation in the cold mill can be reduced by elongation in a drum-drawing machine to achieve a feed rate increase, limitation is possible, power increase by approx. 25 50 ...

For existing tubular blanks, extension

Ί. a) the feeds can be reduced so much that the cross-section of the tube produced is so low that a smaller number of draw pulls results in higher efficiency. can be pulled forward at low speeds to allow dragging; coarser rolling tolerance, which results in an increase in performance; greater; po.suvy neb.o; on the decrease in costs. rolling, tooling, '. * .--- 1 is »Relatively slow drag ;, overhanging: stored thorns up? displaces: rolling emulsion? z. the inside of the nozzles, such that; compaction, rolling, emulsion in the drawing plant did not result in more draw rates at high draw rates. · Cracking of tubes. another, advantage, which.

compensates for the disadvantage of the prior art. In the prior art, it was necessary to reduce the number of strokes. threading; holding. and o. the moving mechanism. a device according to the invention with a mobile catching device; etc.- this reduction in the number of strokes is eliminated.

" Yippee; disadvantageous for performance, equipment ,. Finally, it should be pointed out; that relatively high drive powers for the holding and bending devices can. be used for .pro; process, so that: total energy. ká. The need for equipment 'is decreasing.

An exemplary embodiment of the invention is shown schematically; 1 shows a schematic representation of a first embodiment of the apparatus in plan view, and FIG. 2 shows an alternative embodiment. with ¹ 90 ° deflection of the oven in plan view ··. Copper tubular blank with cO mm outer diameter and 10 mm wall thickness ρ waiting _n? oven, with 37 mm outer diameter4- ant thickness. wall ¹ 1,5 'mm- · ..........................

Passage through rolling mill SO. x 10 'to 40 x 1.9. '^; ý elongation 9,17, ..

reduction-, 89, -7 '»/,' displacement l- mm /? rolled tube for a stroke of 155 mm / stroke of 145 min-1.

Rolling speed 22.5 m / min. Move. drum 40 x: 1.9 to 55 'x 1.5 _Z.

- elongation 1.54, reduction 35 · 'pulling speed 22.5 m / min.

'' Presumed-erh-both .._ for., Stored thorn., Internal, lubrication, and catching 10 seconds corresponds, accumulated, oven length 3, -75 m.

Referring to FIG. 1, the tubular blank 1 is formed by rollers. 2 and a mandrel. 5 in the motion range ΞΤ to. The roll mill Al is rolled into the tube 4 by means of a roll. The tube 4 is rotated 180 ° in the damping region 5 to the device 6 in which the tube 4 is gripped internally, greased and in which the tension mandrel is fitted. The drum pulling machine J is now pulling the pipe. A uniform traction speed Do-5 to T1. oven tip, device. 6, the tube 6 forms in the damping. areas. Loop p that is on. at the beginning of the drawing, and during the drawing, pushed to the position * X. The deflection dimension a.

; t. sn-1.87 µm for the selected example.

7 'of the device according to FIG. 2: the tube is deflected by * 90 °. Goat: - g.

aer: and yet; equals. ' radius, curvature plus accumulated length ΐ

pipes, t-marks, pr.o. selected 'example a = r-5' »75 mPro; both embodiments are js ^; prior to the beginning of the damping area 5, assume a greater straight edge _, e.g., 50 m, equalizing at least a portion. twisting of the oven by reversing the rotation of the oven and creating a time reserve for withdrawing, wound, ovens from the drawing, drum, and. · preparatory; ·: Installation of equipment 6-

Claims (1)

P * & Τ 'E NT Τ O. V: E; N A-R; O .. Ki, ΐ v-y · ^ ty. ’'Γ ·” -; ·',?.> · Ϊ- · *> - Λι /. ' ; ',:. ·. ·, - ··· ..-.;. ·. · -, -' ··· ··· .-- «, ·· - · ,,. ., · - <: ·· η> !. ·; ΑΑΑ? '? .1 »·· Way of pilgrimage rolling / drawing and winding - £ & & D large? length *. taking the oven; aet intermittently. * sune; forward :, and Oi. s ^ x = each other; the price list, always according to; direction. a. cyclically unequal, speed. the protruding pipes are transformed; In the damping region deflecting the oven from the direction, rolled to a constant, run-off speed, the speed has increased by the fact that the oven pulls and winds in the same working operation immediately following. damping area. 2> The method according to item; 1, characterized in that. the oven stretches; . when cold, its cross-section is reduced by at least 25 ° C. 31 The method according to clause. 1 and 21 characterized by. that. Oven before pulling, rollers are not reduced, rolling speed * 1 ··. Method according to one of Claims 1 to 5, characterized in that: the tube is deflected in the damping region from a direction of rolling at an angle of at least 60 °. If it is desired to pull it ... It is controlled by the mean instantaneous velocity, rolling and the length of the oven, accumulated at the time; se jak. it rolls continuously, so it also stretches, it continuously decreases, and the drawing speed after the end of the tube is rolled out, increases so much that. to. for catching, placing the mandrel and lubrication closest: the following oven lengths previously pulled- the oven coil is drained a. the device is ready for the next operation. -6. »Apparatus for carrying out the method according to one of the points. 1 to 5, consisting of a cold pilgrimage mill with a device for rotation 4; ovens extending, one or both, including, from; damping common •, · ': “* ·.»'#!'? ⁵ • '' • 'Γ' · ⁵ ',' ^! · '' · · '' - '- -A', 1 .. ..... . . Tástijpro? equalizing cyclically ⁵ unequal velocities, per. ^CONSTANT: ,, and speed of the bending device, characterized, in that. >'... The drum drawing device is provided as a bending device. machine (7) · 7- .. Equipment. by; Item 6, characterized in that before. drum, towing machine. (T) there is a device for catching, storing darkness. and lubricating an oven arranged stationarily downstream of the damping region (8) The apparatus of claim 7, wherein the damping region (5) is formed as a loop: for first; as a result of its own weight, and after the loop pit, to return it to the rolling plane.