US3616670A - Device and method for rotating the mandrel in a rotary forging mill - Google Patents

Device and method for rotating the mandrel in a rotary forging mill Download PDF

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Publication number
US3616670A
US3616670A US842118A US3616670DA US3616670A US 3616670 A US3616670 A US 3616670A US 842118 A US842118 A US 842118A US 3616670D A US3616670D A US 3616670DA US 3616670 A US3616670 A US 3616670A
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Prior art keywords
piston
recoil
shaft
stroke
rotation
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Expired - Lifetime
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US842118A
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English (en)
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Jean-Paul Calmes
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Individual
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    • 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
    • B21B21/06—Devices for revolving work between the steps
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16H—GEARING
    • F16H31/00—Other gearings with freewheeling members or other intermittently driving members

Definitions

  • the recoil device of a rotary forging mill is enabled to obtain uni-directional rotation of the hollow, or workpiece, between working strokes in such a manner that the angle of rotation is independent of the length of stroke of the recoil piston.
  • the shaft is rotated by two pressure-fluid operated pistons which can be coupled in turn to the. shaft.
  • the pistons are also coupled to each other so that as one piston makes a working stroke the other piston makes a return stroke.
  • the invention relates to a device and method for rotating the mandrel in a rotary forging mill (often referred to as a Pilger mill).
  • the cooling water used during rolling only acts on about a quarter of the periphery of the hollow so that this part of the periphery is more strongly cooled and shrinks (compared to the remainder of the hollow) and the tube being formed can bow upwardly during the rotary forging process.
  • a device for rotating the mandrel holder in a rotary forging mill having two pistons movable in respective cylinder spaces
  • interconnecting means interconnecting the two pistons such that one piston makes a return stroke to its initial position while the other piston makes its working stroke, and vice versa
  • a shaft for linking to the mandrel holder to transmit rotary movement of the shaft to the mandrel holder
  • linking means including a disengageable coupling linking each said piston to the shaft such that the working strokes of the pistons rotate the shaft in the same direction
  • a recoil device for a forging mill having a recoil cylindner
  • a rotary forging mill having a recoil device and a rotating device in accordance with the first aspect of the invention.
  • a method of rotating the mandrel holder when operating a rotary forging mill including engaging one said coupling and supplying pressure fluid to the inlet of the respective cylinder space during the return stroke of the recoil piston to rotate the mandrel holder whilst at the same time the other coupling is disengaged and the other piston in the other said cylinder space makes a return stroke, and disengaging the first coupling and engaging the other coupling to connect the other piston with said shaft.
  • racks can be connected to each said piston for transmitting the movement of the piston to said shaft and/or to the other piston, and the pistons can be formed as an integral piston head on the respective rack.
  • the interconnecting means may comprise a toothed rack connected to each said piston, the lines of action of the racks being parallel, and an idling gear wheel positioned between the racks and meshing with each rack.
  • the linking means may comp-rise a toothed rack connected to each said piston, a toothed member connected to the respective coupling meshing with the respective rack.
  • the coupling engaging and disengaging means are preferably arranged to be operated by compressed gas, and may for instance be of the multi-plate type.
  • the mandrel holder is normally connected to the recoil piston by way of a piston rod, and the shaft of the rotating device may be linked to the piston rod.
  • the couplings are preferably engaged and disengaged during the working stroke of the recoil piston.
  • FIG. 1 is a longitudinal section through a device in accordance with the invention
  • FIG. 2 is a section along the line IIII of FIG. 1;
  • FIG. 3 is a section along the line III-III of FIG. 1.
  • FIG. 1 shows part of the recoil device of a rotary forging mill.
  • a piston rod 2 of a recoil piston 1 has rectilinear lands or splines 3 passing through a mating rotary ring 4.
  • the outer end of the piston rod is connected to a holder 17 for a mandrel 18.
  • the ring 4, which carries external toothing 5, is rotatably mounted in the housing of the recoil device.
  • the ring 4 is connected with a shaft 7 by means of an intermediate gear wheel 6 which is also mounted in the housing of the recoil device, the shaft 7 having a toothed middle section and being rotatably mounted in the housing of the recoil device.
  • Each outer end of the shaft 7 carries a pneumatically-operating multi-plate clutch 8 flanged to a toothed coupling sleeve 9.
  • Two toothed racks 10 are mounted above the shaft 7 and at right angles to the axis of the shaft 7, the teeth 11 on the under sides of the racks 10 meshing with the teeth on the respective coupling sleeve 9.
  • the ends of the racks 10 are in the form of pistons 12 which move in cylinders 13, which cylinders can be supplied with compressed gas.
  • the facing sides of the racks 10 have teeth 14.
  • An idling gear wheel 15 is mounted between the two racks 10 in such a way that it meshes with the teeth 14 of each rack 10.
  • the left-hand rack 10 is in its working position. During the previous working stroke of the recoil piston rod 2, this rack 10 was connected with the shaft 7 by way of the left-hand pneumatic clutch 8 and the toothed coupling sleeve 9. At the beginning of the return stroke of the recoil piston rod 2, compressed gas is supplied to the left-hand space 16 (as seen in FIG. 2) of the cylinder 13, synchronised with the rotation of the rotary forging rolls.
  • the recoil piston rod 2 which is now making its return stroke, and also the hollow (not shown), is rotated about its axis by the movement of the left-hand rack 10, transmitted by way of the shaft 7, the intermediate gear wheel 6 and the ring 4, the movement of the left-hand rack 10 being from left to right as shown in FIG. 2.
  • the stroke of the rack 10 is set so that the desired angle of rotation is exactly reached; at the end of its stroke, the rack 10 is braked by an oil-hydraulic dash-pot similar to that used for braking the return stroke of the recoil piston.
  • the uncoupled right-hand rack 10 is driven back into its initial position by means of the idling gear Wheel 15.
  • the left-hand clutch 8 is exhausted, thereby releasing the connection between the left-hand rack 10 and the shaft 7, whilst at the same time the right-hand clutch 8 is subjected to compressed gas so that the righthand rack 10 is now connected with the shaft 7 by way of the toothed coupling sleeve 9.
  • the right-hand rack 10 is in its working position and the rotation of the recoil piston rod 2 which has already been described in connection with the left-hand rack 10 can now take place in the same direction by passing compressed gas into the space 16 of the right-hand cylinder 13.
  • the rotation of the hollow can be precisely carried out both during the starting or pointing period and during the main rotary forging process, independently of the return movement of the recoil piston rod.
  • the length of the return stroke of the recoil piston rod has no influence on the angle through which the hollow is rotated so that the angle of rotation can be set more exactly.
  • square-section tubes can be produced by setting the angle precisely to or decagonal, hexagonal or octagonal tubes can be rolled with appropriate setting of the angle of rotation.
  • a further advantage is that the rotary forging operation can be carried out with a smaller return pressure because the rotation of the hollow is independent of the return movement of the recoil piston, or, alternatively, with the same return pressure (which is only used for the rectilinear return movement of the recoil piston), the rotary forging process can be carried out at higher recoil speeds and thus at higher speeds of rotation of the rotary forging rolls.
  • a device for rotating the mandrel holder in a rotary forging mill having two pistons movable in respective cylinder spaces,
  • interconnecting means interconnecting the two pistons such that one piston makes a return stroke to its initial position while the other piston makes its working stroke, and vice versa, a shaft for linking to the mandrel holder to transmit rotary movement of the shaft to the mandrel holder,
  • linking means including a disengageable coupling linking each said piston to the shaft such that the working strokes of the pistons rotate the shaft in the same direction
  • interconnecting means comprises respective toothed racks connected to each piston, the lines of action of the rack being parallel, and an idling gear wheel positioned between the racks and meshing with each rack.
  • linking means comprises respective toothed racks connected to each said piston, a toothed member connected to the re spective coupling meshing with the respective rack.
  • a device as claimed in claim 1 including a recoil cylinder, a recoil piston movable in the recoil cylinder, means rigidly connecting said mandrel holder to said recoil piston, and means operatively connecting said shaft to said connecting means for rotating the latter.
  • a method of rotating a mandrel holder when operating a rotary forging mill comprising operatively connecting a piston in a cylinder with said mandrel holder for rotating the holder in a predetermined direction when the piston is moved in one direction, supplying fluid pressure to said cylinder to move said piston in said one direction, shutting off said fluid supply and disconnecting said piston from the mandrel holder, operatively connecting a piston in a second cylinder with the mandrel holder for rotating the holder in said predetermined direction, supplying fluid pressure to said second cylinder to move the piston therein, and returning the piston in either cylinder to the opposite end thereof while fluid pressure is being supplied to the other cylinder.
  • a method as claimed in claim 6, including moving the mandrel holder back and forth in opposite directions, operatively connecting the pistons to and disconnecting them from the mandrel holder only while it is moving in one of said opposite directions, and supplying the fluid pressure to a cylinder only while the mandrel holder is moving in the other of said opposite directions.

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Forging (AREA)
  • Transmission Devices (AREA)
  • Actuator (AREA)
US842118A 1968-07-31 1969-07-16 Device and method for rotating the mandrel in a rotary forging mill Expired - Lifetime US3616670A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE19681752888 DE1752888A1 (de) 1968-07-31 1968-07-31 Vorrichtung und Verfahren zur Drehung des Vorholgestaenges bei einem Pilgerschrittwalzwerk

Publications (1)

Publication Number Publication Date
US3616670A true US3616670A (en) 1971-11-02

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Application Number Title Priority Date Filing Date
US842118A Expired - Lifetime US3616670A (en) 1968-07-31 1969-07-16 Device and method for rotating the mandrel in a rotary forging mill

Country Status (6)

Country Link
US (1) US3616670A (cs)
JP (1) JPS4920712B1 (cs)
CS (1) CS150681B2 (cs)
DE (1) DE1752888A1 (cs)
FR (1) FR2014051A1 (cs)
GB (1) GB1218338A (cs)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6776744B1 (en) 1999-07-28 2004-08-17 Advanced Materials Corporation Method for and devices used in covering a roll core with a resin infused fiber reinforced adhesive under layer and a polymeric top layer, the method including the use of an improved mold tape
CN109396192A (zh) * 2018-11-20 2019-03-01 北京京诚之星科技开发有限公司 定心机

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6776744B1 (en) 1999-07-28 2004-08-17 Advanced Materials Corporation Method for and devices used in covering a roll core with a resin infused fiber reinforced adhesive under layer and a polymeric top layer, the method including the use of an improved mold tape
US20040162202A1 (en) * 1999-07-28 2004-08-19 Shieh Yang T. Method for and devices used in covering a roll core with a resin infused fiber reinforced adhesive under layer and a polymeric top layer, the method including the use of an improved mold tape
CN109396192A (zh) * 2018-11-20 2019-03-01 北京京诚之星科技开发有限公司 定心机
CN109396192B (zh) * 2018-11-20 2023-08-29 北京京诚瑞信长材工程技术有限公司 定心机

Also Published As

Publication number Publication date
FR2014051A1 (cs) 1970-04-10
CS150681B2 (cs) 1973-09-04
GB1218338A (en) 1971-01-06
DE1752888A1 (de) 1971-04-08
JPS4920712B1 (cs) 1974-05-27

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