US3810377A - Thin-walled tube cold-rolling mill - Google Patents

Thin-walled tube cold-rolling mill Download PDF

Info

Publication number
US3810377A
US3810377A US00269817A US26981772A US3810377A US 3810377 A US3810377 A US 3810377A US 00269817 A US00269817 A US 00269817A US 26981772 A US26981772 A US 26981772A US 3810377 A US3810377 A US 3810377A
Authority
US
United States
Prior art keywords
mill
stand
tube
gear racks
rolling
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
US00269817A
Other languages
English (en)
Inventor
P Orro
A Kirilenko
N Kirilenko
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Individual
Original Assignee
Individual
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority to DE2232803A priority Critical patent/DE2232803A1/de
Application filed by Individual filed Critical Individual
Priority to US00269817A priority patent/US3810377A/en
Application granted granted Critical
Publication of US3810377A publication Critical patent/US3810377A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Images

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B21/00—Pilgrim-step tube-rolling, i.e. pilger mills
    • B21B21/005—Pilgrim-step tube-rolling, i.e. pilger mills with reciprocating stand, e.g. driving the stand
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B21/00—Pilgrim-step tube-rolling, i.e. pilger mills

Definitions

  • the present invention relates generally to the production of tubes and more particularly, it relates to mills for cold rolling of thin-walled tubes.
  • a mill for cold rolling of thinand superthin-walled tubes comprising a working stand with reeling and straining rolls with variable section passes housed therein on supports, end gears fit on the rolls toensure reciprocating motion of the stand and the rolls, gear racks for end gears to run thereon and locate the position of the rolls, and a motor with a drive to ensure the operation of the whole mill, as well as a tube-feeding and swinging mechanism (cf. US. Pat. No. 3.030.835 of Apr. 24, 1962).
  • the object of the present invention is to provide a mill for cold rolling of thin-walled tubes so as to help reduce sliding of the pass alongthe tube, eliminate run ning of the ends of a tube to be rolled and a pushing tube into each other and cracking of the tubes ends at the start of rolling.
  • a mill for cold rolling of thinwalled tubes comprising a working stand with reeling and straining rolls with variable section passes housed therein on supports, end gears fitted on the rolls to ensure reciprocating motion of the stand and the rolls,
  • the gear racks are set with the possibility of their longitudinal travel in directions of the travel of the stand whenever a critical frictional force develops in rolling between the pass and a tube being rolled as the rolling radius of the pass is varied; coupled with the racks is a mechanism designed to return said racks to their original position as soon as they are relieved from load caused by the frictional force.
  • the mechanism for returning the racks to their original position be made as a shockabsorbing device fitted with springs and coupled with the racks.
  • the embodiment of the present invention is a mill for cold rolling of thinand superthin-walled tubes, which offers the following advantages: it helps increase the efficiency of the mill two-or three-fold, reduce the number of intermediate preparatory operations 25 to 35 percent, and increase the rolling-down ofa tube up to 50 percent in diameter and up to percent through the thickness of the wall.
  • FIGS. 3 and 4 show the mechanism for moving the racks with provision of a spring shock-absorber
  • FIGS. 5 and 6 show the mechanism for moving the racks with provision of a cam.
  • the mill for cold rolling of thinand superthin-walled tubes has a rectangular working stand 1 resting on rolls 2 that enable its unopposed movement in forward and reverse directions.
  • rolls 2 In the upper and lower sections of the stand I, there are tempered steel base plates 3 over which rolls 4 are rollmg.
  • the stand I is the basic operating mechanism of the mill, wherein the tube is strained by means of rolling tools, i.e., the rolls 4 and an arbor 5.
  • a round pass 6 of variable section is shaped and grounded on the rolls 4. When unrolled, it has a tapered shape which helps strain the tube in diameter and through the thickness of the wall in rolling.
  • wedges 7 Provided for adjusting and controlling the rolls 4 in the upper and lower portions of the stand 1 are wedges 7 with whose help the base plates 3 can draw together or break up.
  • cylindrical wheels 8 coupling both rolls 4 to each other and ensuring synchronism of their movement.
  • drive gears 9 set supplementarily on the lower roll 4 alone, specifically on both ends of it, the drive gears being meshed in its upper part with the gear racks l0 and, in its lower part, with mov ing gear racks 11 provided in the stand 1 of the mill.
  • the gear racks 10 are secured on ma shock absorber l2 loaded with springs 13.
  • the gear racks 11 are rigidly fixed on the stand 1 with the capability of reciprocating motion together with the stand 1
  • FIGS. 3 and 4 show the shock absorber l2 loaded with the draw springs 13. The arrows indicate the direction of the racks travel in forward and reverse movement of the stand.
  • a mechanism 14 designedto turn and feed a tube to be rolled, the mechanism enabling, the feed and the turn of the tube in a rear position alone or separately in each double stroke of the stand I.
  • the turn and feed mechanism is of standard design similar to that used in serial cold-rolling mills.
  • the rearmost end of the mill accomodates a rest 15 for a rod 16, the rest helping to adjust and control the tapered arbor in a source of the strain.
  • the arbor 5 is secured to the forward end of the rod 16 thanks to screw thread.
  • a tube 17 is put on the rod 16 with the arbor 5 secured, to be fed thereafter to the source of strain by means of the feed and turn mechanism 14.
  • the movement of the racks is carried out coercively by an eccentric disk 27 via rollers 28 to correspond to the movement of the passes 6 of the rolls 4 along the natural (variable) rolling radius.
  • the directions of rotation of the disk 27 and the rollers 28 as well as of the travel of the racks are indicated by arrows.
  • the rolling tools i.e., rolls 4 and armor 5, calibrated as prescribed, are mounted into the stand 1 and then adjusted roughly. Furtheron, the tube 17 is put on the rod 16 with the arbor 5 to be conventionally secured within the feed and turn mechanism 14.
  • the motor 24 is cut in to start a low-speed rolling. Via .the elastic wedge belts 22, the motor starts rotating the cranks gear wheels 21 as well as the crank pins 20. Coupled with the pins, the connecting rods 19 actuate the stand l in forward and reverse directions.
  • the motion of the stand 1 results in moving the rolls 4 which turn by about 360, the diameter of the pass 6 getting smaller in forward movement, to count as from the direction of the tube movement, to comply with a prescribed calibration and ranging from the maximum to the minimum one which should correspond to the size of the ready tube 17; ln the course of movement of the stand 1, the rolls 4 move coercively along the base plates 3 due to meshing of a drive gear 9 with the gear racks l0 and 11.
  • the axial frictional forces are subject to elimination as they cause considerable troubles in the mill operation: speedy wear of the passes, higher load on the racks 10 and 11, cracking of the ends of the tube 17, and running of the ends of a tube under rolling and a pushing tube into each other Elimination of the frictional forces is achieved by means of a spring-loaded shock-absorber 13 shown on FIGS. 3 and 4.
  • the operation of the shock-absorber is that, under the action of frictional forces,-the racks 10 move along the rolling axis and compress the springs 13 in this or that direction depending upon forward or reverse travel of the stand. This helps eliminate variable frictional forces emerging between the pass 6 and the tube 17 throughout the pass length.
  • cam mechanism 26 provided instead of the spring-loaded shock-absorber l3 and shown on FIGS. 5 and 6.
  • the mechanism consists of a frame 29 coupled rigidly with the racks 10.
  • a shaft 30 of the frame 29 carries the eccentric disk 27 and two driven rollers 28.
  • the driven rollers 28 move the rack 10in forward and reverse directions synchronously with a variation of the rolling radius.
  • the arrows show the directions of the movement of the racks l0 and of the rotation of the shaft 31.
  • Provision of the spring-loaded shock-absorber 12 or the cam mechanism 27 helps eliminate also the axial frictional forces developing due to the different rolling radii of the pass.
  • the turn and feed mechanism 14 effects feeding and turning of a tube to a prescribed value to enable the rolling of new portions of the tube to its preset diameter and wall thickness. Feeding and turning the tube can be effected separately: turn in forward position and feed in reverse. The designation of'the turn and feed mechanism 14 is to ensure even turning and feeding of the tube within one double travel of the stand.
  • the rod 16 with the arbor 5 is fixed rigidly on the rear stop 15, whereon tube reduction occurs.
  • the latter is made tapered.
  • a thin-walled tube cold-rolling mill comprising: a moving working stand; reeling and straining rolls with passes of variable section being provided in said stand; gear racks being set in said stand and travelling together with said stand during the mill operation; gear racks being mounted on said mill and capable of longitudinal travelling in direction of the movement of said stand whenever a critical frictional force develops in rolling between said pass and a tube to be rolled as the rolling radius of said pass is varied; end gears being fitted on said rolls to couple the latter to each other and to ensure synchronism of their movement, drive end gears being fitted on one of said rolls and meshed with said stand-mounted gear racks and with said gear racks provided on said mill, said drive end gears rolling on them and locating the position of said roll; means for feeding and turning the tube to be rolled being provided in the rear section of said mill to ensure even turning and feeding of the tube in one double stroke of said stand; dampening means for returning said gear racks mounted on said mill to their initial position after relieving them from the load caused by the frictional force;
  • a mill as claimed in claim I, wherein said dampen ing means for returning said gear racks mounted on the mill to their initial position is made as a cam mechanism comprising a frame fixed rigidly with said gear racks mounted on said mill and coupled with a drive shaft, said frame of said cam mechanism actuating said gear racks in directions of the movement of said stand synchronous with variations in the rolling radius of said pass.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Reduction Rolling/Reduction Stand/Operation Of Reduction Machine (AREA)
  • Transmission Devices (AREA)
US00269817A 1972-07-04 1972-07-07 Thin-walled tube cold-rolling mill Expired - Lifetime US3810377A (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
DE2232803A DE2232803A1 (de) 1972-07-04 1972-07-04 Walzwerk zum kaltwalzen von duennwandigen rohren
US00269817A US3810377A (en) 1972-07-04 1972-07-07 Thin-walled tube cold-rolling mill

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE2232803A DE2232803A1 (de) 1972-07-04 1972-07-04 Walzwerk zum kaltwalzen von duennwandigen rohren
US00269817A US3810377A (en) 1972-07-04 1972-07-07 Thin-walled tube cold-rolling mill

Publications (1)

Publication Number Publication Date
US3810377A true US3810377A (en) 1974-05-14

Family

ID=25763507

Family Applications (1)

Application Number Title Priority Date Filing Date
US00269817A Expired - Lifetime US3810377A (en) 1972-07-04 1972-07-07 Thin-walled tube cold-rolling mill

Country Status (2)

Country Link
US (1) US3810377A (de)
DE (1) DE2232803A1 (de)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3905244C2 (de) * 1989-02-21 1995-05-11 Mannesmann Ag Verfahren und Vorrichtung zur Herstellung von strangförmigem metallischen Gut

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2161065A (en) * 1936-12-02 1939-06-06 Frank R Krause Apparatus for reducing tubular blanks
US3030835A (en) * 1958-06-06 1962-04-24 Blaw Knox Co Tube rolling machine
US3570294A (en) * 1967-12-06 1971-03-16 Jintaro Shibata Pipe rolling equipment

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2161065A (en) * 1936-12-02 1939-06-06 Frank R Krause Apparatus for reducing tubular blanks
US3030835A (en) * 1958-06-06 1962-04-24 Blaw Knox Co Tube rolling machine
US3570294A (en) * 1967-12-06 1971-03-16 Jintaro Shibata Pipe rolling equipment

Also Published As

Publication number Publication date
DE2232803A1 (de) 1974-01-17

Similar Documents

Publication Publication Date Title
EP3393689B1 (de) Kaltpilgerwalzanlage
US2161065A (en) Apparatus for reducing tubular blanks
US3210981A (en) Construction and control of planetary mills
US4184352A (en) Method for pilger rolling of tubes and mill for effecting same
US3439519A (en) Billet roughing mill
US3810377A (en) Thin-walled tube cold-rolling mill
US4145906A (en) Feeding device of a tube cold-rolling mill
DE69000735T2 (de) Mechanismus mit geringer traegheit zum wiedereinstellen eines werkstueckes in einem pilgerwalzwerk.
US3303679A (en) Machine for coiling strip metal
US3357223A (en) Tube reducing machine
JPS5976603A (ja) ピルガ−式段階法を用いてパイプを冷間圧延する方法と装置
RU2036044C1 (ru) Стан поперечной прокатки
US2165266A (en) Needle roll cold reduction mill
US3078748A (en) Rolling mill
DE2753267C3 (de) Stoßbank zum Herstellen von Rohrluppen
US2819632A (en) Device for rolling teeth
JPS6033563B2 (ja) 熱間ピルガー圧延装置
US2206759A (en) Cross rolling
US3145591A (en) Leaf spring tapering apparatus
CN116532495B (zh) 一种管胚防顶撞控制装置及冷轧管机
SU379297A1 (ru) ПйТЕйТШМЕлШ^ЮМ^
JPH0152083B2 (de)
US3090265A (en) Apparatus for rolling disks
SU500828A1 (ru) Поворотно-подающий механизм стана холодной прокатки труб
US2760389A (en) Machine for producing finned tubing