US2775150A - Pilger mill apparatus - Google Patents

Pilger mill apparatus Download PDF

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Publication number
US2775150A
US2775150A US340792A US34079253A US2775150A US 2775150 A US2775150 A US 2775150A US 340792 A US340792 A US 340792A US 34079253 A US34079253 A US 34079253A US 2775150 A US2775150 A US 2775150A
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United States
Prior art keywords
piston
cylinder
mandrel
carriage
rolls
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Expired - Lifetime
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US340792A
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English (en)
Inventor
Mclay Gavin Smellie
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.)
Stewarts and Lloyds Ltd
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Stewarts and Lloyds Ltd
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Publication date
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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
    • B21B21/04—Pilgrim-step feeding mechanisms

Definitions

  • the present invention relates to pilger mill apparatus.
  • a pilger mill comprises a mandrel on which a heated open-ended cylindrical. hollow or tube blank is placed and by which it is passed between a pair of driven rolls having a grooved periphery with a gap therein.
  • the mandrel is mounted on the outer end of a forwardly projecting extension of a piston which moves in an air cylinder. rlhe piston and cylinder together constitute resilient means against which the mandrel is forced as the rolls rotate and operate on the tube blank.
  • Inward movement of the piston in the cylinder by the action of the rolls on the tube blank compresses the air conned in the cylinder and the compressed air provides the necessary energy to move the mandrel and the tube blank forward, when the gap in the rolls is reached, to advance the tube blank between the rolls.
  • the front part of the piston is usually provided with a shoulder which, at the end of theforward movement of the piston by the expansion of the air compressed in the cylinder, forcibly engages a fixed shoulder of similar shape at the front partof a liquid container located at the front of the cylinder, i. e. between the cylinder and the rolls.
  • This xed shoulder is located ⁇ at the end of a cylindrical portion ofthe container which is of slightly larger diameter than the piston and to reduce the shock on impact between the shouldered portion of the piston and the fixed shoulder it is arranged that the front, i. e. shouldered, part of the piston enters the cylindrical portion of the container to drive liquid (usually water) from the cylindrical portion into the main part of the container.
  • the resistance offered to the displacement of the liquid -by the slight annular space between the piston and the cylindrical portion of the container provides a certain amount of cushioning between the piston and the frontend of the Cylindrical portion.
  • the cylinder and piston and also the liquid container are usually mounted on a carriage which, during rolling operations, is moved steadily forwards by hydraulic feed apparatus which is controlled in accordance with the required rate of feed of the tube blank between the rolls.
  • hydraulic feed apparatus which is controlled in accordance with the required rate of feed of the tube blank between the rolls.
  • Pilger mill apparatus in which this disadvantage is at least partly overcome by providing means to reduce the transmission of shock to the hydraulic feed apparatus is described in my co-pending patent application No. 333,544 and the present invention is particularly suitable for embodiment in improved ⁇ apparatus of this nature.
  • a support table a carriage slidably mounted on such table to move therewith with limited movement with respect thereto
  • said carriage supporting resilient means comprising a first part which is movable forward and backward on the carriage and supports the mandrel and a companion part which is fixed relatively to the carriage, and driving means to move the support table forward and backward, is characterised by a member mounted, preferably adjustably, on the first part of the resilient means and an abutment fixed to the support table and engageable by said member to determine the limit of forward movement of said first part of the resilient means with :respect to said support table.
  • the invention provides a means whereby the position relative to the support table of the first part of the resilient means, and hence of the mandrel attached thereto and the tube blank, can be determined with some precision after the mandrel has been brought to rest at the end of its forward stroke, that is after some at least of the shock occurring on deceleration of the moving parts has been taken up.
  • further resilient means mounted between said member and said abutment.
  • This further resilient means may be rigidly attached either to said member or to said abutment .and be engageable by either the abutment or the member respectively to cushion the engagement between said member and said abutment.
  • the first-mentioned resilient means comprise an air cylinder ⁇ and a piston movable therein as hereinbefore described and the further resilient means between the abutment and the member may comprise apparatus including a piston and a cooperative cylinder of which one is carried or engageable by the member and the other is fixed to the abutment.
  • the further resilient means may comprise one or more springs of which one end is fixed to the member ⁇ or the .abutment and the other end is engageable either by the abutment or by the member respec* tively.
  • the further resilient means comprises a plurality of pistons and cylinders and a disc or anuulus carried by the pistons and arranged to be engaged by a member mounted, preferably adjustably on the first part of the first-mentioned resilient means, said disc or annulus having a stop face 'to engage a corresponding stop face on the abutment.
  • Apparatus in accordance with the invention preferably also includes means to take up shock caused on the foiward movement of the mandrel by the first-mentioned resilient means, one part thereof being connected to the carriage and the other part being fixed, for example, to the ground.
  • Fig. l is a part sectional elevation of one form of pilger mill apparatus in accordance with the present improve ments
  • Fig. 2 is a fragmentary sectional elevation to a larger scale illustrating a modification
  • Fig. 3 is a similar view of a further modication
  • Fig. 4 is an enlarged view of the resilient means.
  • the apparatus shown in Figure l comprises a sole plate 1 fixed to the ground and having at each end an upstanding pillar 2 or 3.
  • a support table 4 is mounted to slide on the upper face of the sole plate between the pillars 2, 3 and a carriage 5 is mounted to slide on the upper surface of the support table, sce also Figure 4.
  • v The amount of relative ⁇ movement between the carriage and the support table is controlled by two projections, one, marked 6, lfrom the carriage and the other, marked 7, from the support table. These projections engage respectively the forward end of the support table at 8 and the rear-end of the carriage, a cushioning block 9 being provided between the projection i and the rear end of the carriage.
  • Driving means provided for the support table 4 comprises opposed co-axial hydraulic cylinders mounted respectively on the pillars 2, 3 of the sole plate 1 and having co-operating pistons, the piston 10 of one ycylinder 11 (usually termed the feed cylinder), engaging the rear end of the support table 4 to feed the latter and the carriage towards the pilger rolls 12, and the piston 13 of the other cylinder 14 (usually termed ⁇ the stripper cylinder), engaging the projection 6 extending downwards from the front end of the carriage 5 to move the latter and the support table 4 in Athe opposite direction.
  • the feed cylinder 11 may be connected at 15 to a hydraulic accumulator system, as is well known, or, as shown, to a variable delivery type of hydraulic pump 16.
  • the latter is connected by duct 17 on its suction side with a further and xed hydraulic cylinder 18 having a piston 19 which is common to a still further and fixed hydraulic cylinder 20 which through duct 21, is supplied with pressure liquid from a hydraulic accumulator system (not shown) through a control valve 22.
  • This pressure liquid may be Water Whilst that in the hydraulic cylinder 18 and the feed cylinder 11 may be oil.
  • Means, such as a restricted and adjustable sunt type hydraulic valve 23 of known form, may be connected in parallel with the variable delivery type hydraulic pump 16 so that the latter acts as a quantitative measuring device for the feed cylinder 11 and is only called on to deal with a part of the volumetric requirements of the feed cylinder.
  • the stripper cylinder 14 is connected by duct 24 to exhaust through a valve 25 and means which will oifer a constant resistance to the travel of the stripper cylinder piston 13.
  • Such means may be as normally employed for this purpose, namely a second hydraulic valve 26 having a restricted and adjustable orifice.
  • the valve 22 which controls the supply of hydraulic liquid to the cylinder 20 also controls the connection of that cylinder to exhaust at 27 and the connection of hydraulic liquid, through another valve 28, to the stripper cylinder 14 when the latter is disconnected from exhaust.
  • the carriage 5 is formed with resilient means for the mandrel 29, this means comprising a horizontal air cylinder 30 and a piston 31 having a hollow extension 32.
  • This piston 31, which. extends through glands in the front wall of the ⁇ cylinder 30, reduces beyond the air cylinder 30, i. e. at a shoulder 34 of relatively steep inclination, to a further extension 35 of less diameter than such piston and which carries the mandrel holder 33 at its forward end.
  • the pistou extension 32 passes through a liquid container 36 which is disposed on the carriage 5. As shown, this liquid container has a cylindrical portion 37 containing a liner 38 having an internal shoulder 39 of similar shape to the shoulder 34.
  • the internal diameter of the liner 38 is only slightly larger than the piston and its wall preferably converges slightly towards its front end.
  • the construction thus described constitutes a cushion lthrough which the impact shock due to rapid deceleration of the moving parts comprising the piston 31, the mandrel 29, and the tube blank 40 is transmitted to the carriage 5 as will be described.
  • a pressure relief valve 41 controls an outlet from the front end of the slight annular space within the part 37'so that liquid may escape into the vmain part of the container when the pressure in such space reaches a predetermined amount.
  • the piston 31 of the air cylinder 30 is xedly fitted, internally, with a nut 42 co-operating with a series of helical grooves 43 in a spindle 44 revolubly mounted in bearings in a xture 45 on the rear end of the cylinder 30, the nut having internal spiral grooves of similar shape and pitch as those marked 43.
  • the pitch of each helix of grooves 43 is four times the working length of the pilger rolls 12.
  • the spindle 43 carries a double ratchet 4Wheel 46 which is housed in the fixture 45 and is able to rotate in one direction but is prevented from rotation in the opposite direction by spring pawls l47.
  • the mandrel is turned about its axis by the interaction of the helical grooves at 43 on the aforesaid spindle 44 and in the nut 42 thereby bringing the work to a different radial relationship with the peripheral kgrooves in the rolls 12.
  • the stripper cylinder and piston 13, 14 are operated to remove (strip) the tube from the lmandrel 29 and return the support table 4 and carriage 5 to the commencing position for the mandrel to receive another tube blank, and so on.
  • a further resilient means is provided for ensuring ⁇ that the mandrel 29 shall be brought to rest at exactly the same point with respect to the support table 4 during each forward movement of the piston 31.
  • the forward extension 35 of the piston is provided with a screw-threaded portion 50 on which is mounted a member constituted by an internally threaded collar 51 which is thus adjustable lengthwise of the piston extension.
  • the forward face of the collar is extended at 51a (cf. also Figure 2) in the direction of the rolls 12.
  • Fixed to the support table 4 is an abutment 52 carrying two hydraulic cylinders 53 the cooperating rams 54 of which carry an annular disc 55 (see also Figure 2).
  • the extension 35 passes freely through the abutment 52 and the annular disc 55.
  • the inner surface of this disc has a machined face constituting a stop face 56 (see Figure 4) to engage a corresponding stop face 57 on the abutment 52.
  • the collar 51 and disc 55 are arranged to co-operate so that, when the collar moves forward on forward movement of the Vpiston extension 35, it causes movement of the disc to bring its stop face 56 into contact with the stop face 57 on the abutment.
  • the position of the piston extension 35 and hence of the mandrel 29 and tube blank 4l) relative to the support table 4 can be accurately determined at each forward stroke of the piston 31.
  • This position can be adjusted before rolling commences to suit particular rolling requirements by axial adjustment of the collar 51 on the screwed portion 50 of piston extension 35.V
  • the hydraulic apparatus 53, 54 disposed between the abutment S2 and the disc 55 constitutes cushioning means between the member 51 xed to the piston extension 35 and the abutment 52 as will be understood.
  • FIG. 3 illustrates how the apparatus of Figure 1 and Figure 2 may be fitted with means for taking up the shock of impact at the shoulders 34, 39, Figure l, on the return (forward) movement of the piston 31, piston extension 32, 35, mandrel 29 and tube blank 40 under the reactive impulse of the resilient means on release of these parts when the gaps 60 in the rolls 12 come round to the blank.
  • the rear end of the carriage 5 is connected to one part of means to take up shock, the co-operating part being fixed to the ground.
  • Such means conveniently comprises a fluid pressure cylinder and piston combination including a hydraulic cylinder 65 fixed to the upper end of the pillar 2 of the sole plate 1 and a co-operating piston 66 fixed to a crossehead 67 which is connected by connecting rods 68 to the carriage 5.
  • the normal hydraulic pressure in the cylinder 65 is relatively low, for example 150 lbs. per sq. inch, but is, of course, raised considerably when the carriage 5 is submitted to shock and is controlled to a predetermined value by the employment of a pressure relief valve (not shown) in the feed circuit to such cylinder.
  • the resilient means first-mentioned and the mandrel rotating means may be made of the construction described in the specification belonging to the co-pending patent application No. 333,544 aforesaid.
  • Pilger mill apparatus forthe production of seamless metal tubes, comprising a set of pilger rolls, a feed table movable forward and backwards with respect to said rolls, a carriage slidably mounted on said feed table, stops on said feed table to limit the sliding movement of said carriage on said feed table, means to move said table and said slidably mounted carriage thereon constantly towards said rolls until the latter have completed the rolling of a tube, a mandrel carrier mounted in said carriage, a mandrel operatively connected to said mandrel carrier, resilient means at one end of said carriage and responsive to cushion the rearward axial movement of said mandrel carrier on said carriage under the action of said rolls on their rolling stroke and braking means at the opposite end of said carriage between and coaxial with said mandrel carrier and said carriage to take up the forward thrust movement of the said mandrel carrier under the reactive action of said resilient means when the rolls free the work piece and stop means for said mandrel carrier comprising a first and second cooperating means, said first means being mounted on said
  • Pilger mill apparatus in accordance with claim l wherein said first and second cooperating means have resilient means disposed between said means to cushion the engagement of the means and said resilient means comprises a piston attached to one of said cooperating means and the mating cylinder attached to the other of said cooperating means.
  • Pilger mill apparatus in accordance with claim 1, wherein said first and second cooperating means have resilient means disposed between said means to cushion the engagement of the means and said resilient means cornprises a plate and a plurality of springs mounted on one of said cooperating means and an abutment means on said other cooperating means.
  • Pilger mill apparatus in accordance with claim 1, wherein said first and second cooperating means have resilient means disposed between said means to cushion the engagement of the means and said resilient means comprises a plurality of pistons operatively connected to an annular plate, said pistons being received in cylinders in one of said cooperating means, the other of said cooperating means being a disc to engage said annular plate.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Crushing And Grinding (AREA)
  • Lining Or Joining Of Plastics Or The Like (AREA)
  • Shaping Of Tube Ends By Bending Or Straightening (AREA)
  • Shaping Metal By Deep-Drawing, Or The Like (AREA)
  • Springs (AREA)
US340792A 1952-03-07 1953-03-06 Pilger mill apparatus Expired - Lifetime US2775150A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB6052/52A GB729136A (en) 1952-03-07 1952-03-07 Improvements in or relating to pilger mill apparatus

Publications (1)

Publication Number Publication Date
US2775150A true US2775150A (en) 1956-12-25

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ID=9807540

Family Applications (1)

Application Number Title Priority Date Filing Date
US340792A Expired - Lifetime US2775150A (en) 1952-03-07 1953-03-06 Pilger mill apparatus

Country Status (7)

Country Link
US (1) US2775150A (enrdf_load_stackoverflow)
BE (1) BE518232A (enrdf_load_stackoverflow)
DE (1) DE934224C (enrdf_load_stackoverflow)
ES (1) ES208117A1 (enrdf_load_stackoverflow)
FR (1) FR1077599A (enrdf_load_stackoverflow)
GB (1) GB729136A (enrdf_load_stackoverflow)
NL (1) NL87219C (enrdf_load_stackoverflow)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3638466A (en) * 1968-06-20 1972-02-01 Calmes Jean Paul Recoil device for a rotary forging mill

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2617662C2 (de) * 1976-04-22 1985-10-24 Mannesmann AG, 4000 Düsseldorf Vorschubeinrichtung für Warmpilgerwalzwerke
DE3019383C2 (de) * 1980-05-19 1985-03-07 Mannesmann AG, 4000 Düsseldorf Steuerung eines pneumatisch angetriebenen Vorholers in einer Pilgerwalzanlage

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE125290C (enrdf_load_stackoverflow) *
US671563A (en) * 1900-12-17 1901-04-09 Perrins Ltd Manufacture of metallic tubes.
US738067A (en) * 1903-01-27 1903-09-01 Jaques Reimann Machine for profiling non-circular tubes or rods.
GB190509880A (en) * 1905-05-10 1905-08-24 Max Mannesmann Improvements in Feeding Apparatus for Rolling Mills with Step by Step Action.
US811526A (en) * 1902-01-02 1906-01-30 Nat Tube Co Mechanism for feeding tubular billets.
US869283A (en) * 1906-04-02 1907-10-29 Emil Winter Mill for manufacture of tubes, &c.
US1041661A (en) * 1911-02-28 1912-10-15 Adolf Alexander Karl Nowak Brake device for rolling-mills.
US1833990A (en) * 1927-03-18 1931-12-01 Schloemann Ag Air brake mechanism for pilger mill feed gears

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE174882C (de) * 1902-11-07 1906-09-29 Mannesmannroehren-Werke Spiesevorrichtung für Pilgerwalzwerke mit feststehendem Walzengestell
DE549814C (de) * 1929-02-07 1932-05-03 Ewald Roeber Vorholvorrichtung fuer Pilgerschrittwalzwerke

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE125290C (enrdf_load_stackoverflow) *
US671563A (en) * 1900-12-17 1901-04-09 Perrins Ltd Manufacture of metallic tubes.
US811526A (en) * 1902-01-02 1906-01-30 Nat Tube Co Mechanism for feeding tubular billets.
US738067A (en) * 1903-01-27 1903-09-01 Jaques Reimann Machine for profiling non-circular tubes or rods.
GB190509880A (en) * 1905-05-10 1905-08-24 Max Mannesmann Improvements in Feeding Apparatus for Rolling Mills with Step by Step Action.
US869283A (en) * 1906-04-02 1907-10-29 Emil Winter Mill for manufacture of tubes, &c.
US1041661A (en) * 1911-02-28 1912-10-15 Adolf Alexander Karl Nowak Brake device for rolling-mills.
US1833990A (en) * 1927-03-18 1931-12-01 Schloemann Ag Air brake mechanism for pilger mill feed gears

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3638466A (en) * 1968-06-20 1972-02-01 Calmes Jean Paul Recoil device for a rotary forging mill

Also Published As

Publication number Publication date
GB729136A (en) 1955-05-04
NL87219C (enrdf_load_stackoverflow)
FR1077599A (fr) 1954-11-09
DE934224C (de) 1955-10-13
ES208117A1 (es) 1953-05-01
BE518232A (enrdf_load_stackoverflow)

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