US3391561A - Process and apparatus for producing cylindrical tubular bodies from blooms - Google Patents

Process and apparatus for producing cylindrical tubular bodies from blooms Download PDF

Info

Publication number
US3391561A
US3391561A US379834A US37983464A US3391561A US 3391561 A US3391561 A US 3391561A US 379834 A US379834 A US 379834A US 37983464 A US37983464 A US 37983464A US 3391561 A US3391561 A US 3391561A
Authority
US
United States
Prior art keywords
bloom
plug
piercing
mandrel bar
pass
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
US379834A
Other languages
English (en)
Inventor
Calmes Albert Henri
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.)
CONTUBIND SA
Original Assignee
CONTUBIND SA
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
Application filed by CONTUBIND SA filed Critical CONTUBIND SA
Application granted granted Critical
Publication of US3391561A publication Critical patent/US3391561A/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
    • B21B17/00—Tube-rolling by rollers of which the axes are arranged essentially perpendicular to the axis of the work, e.g. "axial" tube-rolling
    • B21B17/08—Tube-rolling by rollers of which the axes are arranged essentially perpendicular to the axis of the work, e.g. "axial" tube-rolling with mandrel having one or more protrusions, i.e. only the mandrel plugs contact the rolled tube; Press-piercing mills

Definitions

  • the manufacture of hollow metal bodies open at both ends is usually carried out with the aid of the Mannesmann cross-roll or roll-piercing mill, by piercing round bars or ingots.
  • the blank Because of the high specific tensile and shearing stresses applied to the inner and outer surfaces of the hollow body, the blank must be of outstandingly good metallurgical and physical quality. Casting defects, such as pores, inclusions or segregations, on or below the surface of the bar or ingot, lead to cracks and laminations or peeling at the surface of the formed hollow or tubular body, stemming from the high tensile and shearing stresses created by this method of piercing and rolling. Moreover, uneven heating of the round bars in the furnace is likely to lead to the formation of eccentric holes and unequal wall thickness of the hollow bodies formed from the bars.
  • Another method of manufacturing cylindrical tubular bodies consists in piercing a plain square billet in a round container in a hydraulic piercing press, by pushing a punch through the center of the billet.
  • a piercing process in a tapered cylindrical container, it has been observed that berow the punch head in a plastic region, the height of which is determined by the depth of penetratration of the bundle or gliding lines, there are two zones of dilferent behavior.
  • One of these is a lower zone, in which the material is freely deformed towards the exterior.
  • the other is an upper zone, which is located directly below the punch head and is characterized by contact of the surface of the billet with the container wall.
  • the pierced hollow body has a tapered form, with a somewhat square section at the open upper end at which the punch is first introduced.
  • the outside skin of the hollow body is cooled by the rather long contact of the material with the cold press container, so the hollow has to be reheated before further processing, especially if it is to be cross-rolled in an elongator-equalizer.
  • FIG. 1 is a longitudinal section with the center portion broken away, through a square metal bloom having concave sides;
  • FIG. 2 is a cross-section of the bloom taken on the line 11-11 of FIG. 1;
  • FIG. 3 is a vertical section through a press-piercing mill, showing the bloom about to be pierced;
  • FIG. 6 is a section similar to FIG. 3, but showing the ending of the piercing operation.
  • FIGS. 7 and 8 are cross-sections taken on the lines VIIVII and VIII--VIII, respectively, of FIG. 6.
  • two or more driven rolls 1' are each provided with annular grooves which are shaped transversely as arcs of circles.
  • the rolls cooperate to provide a circular roll pass between them (FIG. 7).
  • Rigidly mounted in any suitable manner at the entrance to the roll pass is a bloom guide f that has a horizontal passage through it shaped to receive the polygonal steel or nonferrous bloom a that is to be processed.
  • the bloom has a generally square shape in cross section (although it could have more than four sides) and is slidably supported in the guide in such a manner that it cannot turn on its axis, but must remain properly oriented relative to the roll pass.
  • a tapered or conical plug Disposed between the rolls in their grooves is a tapered or conical plug i. Being a piercing plug, its small or pointed end faces the bloom guide 1.
  • the opposite end of the plug is supported by one end of a mandrel bar It that extends outwardly away from the delivery side of the roll pass to a suitable retractable support (not shown).
  • the bar centers the larger end of the plug in the circular roll pass.
  • the plug and mandrel bar may be water cooled.
  • the plug end of the bar is supported in axial alignment with the circular roll pass by a guide block g slidably mounted on the bar and slidably supported in a guiding die that is rigidly mounted at the delivery side of the roll pass.
  • one end of the bloom preferably is provided with an axial centering hole 0, which may be filled with a material acting as a lubricant and as a protection against oxidizing after piercing.
  • the hole also makes it certain that the initial piercing of the bloom will be along its axis.
  • the bloom has a centering recess b in its opposite end. This hole preferably tapers inwardly of the bloom and has an area at its outer end about equal to of the cross sectional area of the bloom.
  • a tubular pusher or ram (1 is moved forward against the rear end of the bloom.
  • a plunger :2, mounted inside the ram projects from the front end of the ram and into the bloom recess 1).
  • the ram and plunger are moved forward in unison by suitable means to force the front end of the bloom into engagement with the rolls and substantially simultaneously against the piercing plug as shown in FIGS. 3 and 5.
  • the centering hole 0 in the front end of the bloom receives the plug and therefore centers the bloom on the plug.
  • the ram and plunger As the ram and plunger continue to push the bloom ahead, it is forced over the piercing plug, aided by the rolls which compress the corners of the bloom toward the plug as the bloom is expanded between its corners by the plug. As the bloom enters the circular roll pass the rolls roll the polygonal bloom into circular shape around the larger end of the plug. That is, the pushing force exerted by the ram axially on the bloom, the axial piercing by the plug, and the radial force exerted by the rolls, simultaneously and in combination transform the polygonal centered bloom into a cylindrical tubular body having a wall of uniform thickness.
  • the guiding die 1 push-ing the guide block g along the mandrel bar ahead of it.
  • the cylindrical body then is held coaxially of the roll pass by means of the guiding die, and the piercing plug and mandrel bar are held in axial alignment with the pass by means of the cylindrical body as the latter pushes the guide block out of the die.
  • the length and diameter of centering hole 0 are such that the hole maintains the piercing plug centered in axial alignment with the bloom axis until the front end of the hollow body leaving the roll pass can enter the guiding die.
  • the length of the centering hole preferably is not less than the length of the tapered portion of the piercing plug.
  • the mandrel bar and the cylindrical body then are withdrawn from the outer end of the guiding die, and the mandrel bar is subsequently extracted from the body. Thereafter, a new piercing cycle can start as soon as the piercing plug has been returned to its operative position in the roll pass.
  • the sides of the bloom preferably are concave transversely, by reason of which the creation of tensile stresses is reduced through the deformation of the concave shape of the bloom sides to a convex shape in my process. Furthermore, when casting blooms in a continuous mold, it is preferable to form the blooms with concave sides, so by using the process of this invention, such blooms can be used directly after casting without further work.
  • the concave sides of the bloom also contribute to better quality, and higher output capacity of a continuous casting plant, and this cheap raw material can be converted into high quality pipe by avoiding excessive tensile and shearing stresses on the metal.
  • the piercing of the bloom by axial pressure forces starts at about the same time as the rolling action of the rolls on the corners of the bloom.
  • the area of contact of the rolls with the bloom gradually increases until the bloom is engaged by the rolls for 360 around it.
  • the blooms are deformed solely by compressive forces on the outer and inner surfaces of the hollow bodies being formed, in order to reduce the tensile and shearing stresses on the material during the piercing.
  • the upper zone of deformation previously mentioned can be reduced materially in extent by my method by the characteristic features of the press-piercing mill.
  • the shearing stresses created by this method act on a much reduced contact surface and the shearing forces assume limited values. Since the scale can be reduced or eliminated at the same time by water jets, it is clear that scratches can be avoided or greatly reduced.
  • the degree of yield of the deforming operation is thus favorably influenced.
  • Apparatus for producing cylindrical tubular bodies from polygonal cross-section metal blooms comprising driven grooved rolls forming a circular roll pass, a tapered piercing plug, a mandrel bar at the outlet end of the pass supporting the plug in the center of the pass, means engageable with one end of a polygonal bloom for forcing the bloom forward over said plug and mandrel bar as the bloom is rolled into cylindrical shape in said pass, whereby a cylindrical tubular body will move along the mandrel bar, and a guiding die rigidly mounted at the outlet of the pass for receiving said body and engaging the outside of it as it moves along the mandrel bar.
  • Apparatus according to claim 1 including a guide block slidably mounted on said mandrel bar and slidably supported by said guiding die to support said bar, the guide block being adapted to be engaged and moved along the bar by the leading end of said tubular body.
  • Apparatus for producing a cylindrical tubular body from a substantially square metal bloom having a centering hole in its leading end comprising a pair of driven grooved rolls forming a circular roll pass, a tapered piercing plug, a mandrel bar at the outlet end of the pass supporting the plug in the center of the pass, means engageable with the trailing end of said bloom for forcing the bloom forward over said plug and mandrel bar as the bloom is rolled into cylindrical shape in said pass, whereby a cylindrical tubular body will move along the mandrel bar, said mandrel bar holding said plug in a position where the plug will be engaged by the edge of said bloom centering hole substantially simultaneously with first contact of the corners of the bloom with said rolls, and a stationary guiding die at the outlet of the pass surrounding said mandrel bar for receiving said tubular body and engaging the outside of it as it moves along the mandrel bar.
  • a process for producing cylindrical tubular bodies from polygonal cross-section metal blooms comprising applying axial pressure to such a bloom to force it onto and over a tapered piercing plug, substantially simultaneously with the first contact of the bloom with the plug applying radial pressure to the corners of the bloom to compress them toward the plug as the advancing bloom is expanded between its corners by the plug, continuing and controlling said simultaneous compression and expansion of the advancing bloom to form it into a cylindrical tubular body having a uniform wall thickness, whereby the entire portion of the bloom passing over the plug is subjected to circumferential compressive forces from substantially the moment the bloom engages the plug, and entering the leading end of said tubular body into a guiding die as said body leaves said piercing plug.
  • a process for producing cylindrical tubular bodies from substantially square blooms with transversely concave sides comprising providing one end of such a bloom with a centering hole, applying pressure to the opposite end of the bloom axially thereof to force the bloom onto and over a bar-supported tapered piercing plug having a maximum diameter greater than the maximum diameter of said hole, substantially simultaneously with the first contact of the bloom with the plug applying radial pressure to the four corners of the bloom to compress them toward the plug as the advancing bloom is expanded between its corners by the plug, continuing and controlling said simultaneous compression and expansion of the advancing bloom to form it into a cylindrical body having a uniform wall thickness, and entering the leading end of said cylindrical body into a guiding die as it leaves said piercing plug to maintain the plug in axial alignment with the bloom.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Metal Rolling (AREA)
US379834A 1963-07-04 1964-07-02 Process and apparatus for producing cylindrical tubular bodies from blooms Expired - Lifetime US3391561A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DEC0030354 1963-07-04

Publications (1)

Publication Number Publication Date
US3391561A true US3391561A (en) 1968-07-09

Family

ID=7019304

Family Applications (1)

Application Number Title Priority Date Filing Date
US379834A Expired - Lifetime US3391561A (en) 1963-07-04 1964-07-02 Process and apparatus for producing cylindrical tubular bodies from blooms

Country Status (7)

Country Link
US (1) US3391561A (de)
AT (1) AT258842B (de)
BE (1) BE649578A (de)
DE (1) DE1302427B (de)
GB (1) GB1008709A (de)
NL (1) NL6407605A (de)
SE (1) SE320042B (de)

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4052874A (en) * 1975-07-18 1977-10-11 Nippon Steel Corporation Method of producing tubular body in a press roll piercing mill
US4074557A (en) * 1975-10-30 1978-02-21 Nippon Steel Corporation Metal extrusion process with high reduction
US4341106A (en) * 1977-04-13 1982-07-27 Gleason Works Apparatus for controlling the movement of a reciprocatory hydraulically driven element of a metal forming machine
US4455849A (en) * 1980-04-21 1984-06-26 Nippon Steel Corporation Press-rolling process for producing a metal tubular product
US4674171A (en) * 1984-04-20 1987-06-23 Lor, Inc. Heavy wall drill pipe and method of manufacture of heavy wall drill pipe
US4771811A (en) * 1984-04-20 1988-09-20 Lor, Inc. Heavy wall drill pipe and method of manufacture of heavy wall drill pipe
WO1993018870A1 (en) * 1992-03-23 1993-09-30 Mosey George N Piercing mill for seamless tube manufacture
RU2721253C1 (ru) * 2019-09-09 2020-05-18 Общество с ограниченной ответственностью "ФБТ" (ООО "ФБТ") Способ изготовления длинномерных пустотелых изделий и устройство для его реализации
US20210220884A1 (en) * 2020-01-20 2021-07-22 Yanshan University Dynamic Contact Heat Transfer Simulation Device for Rolling Heavy-Load Deformation Zone

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
IT1115518B (it) * 1977-04-21 1986-02-03 Innocenti Santeustacchio Spa Guida di entrata per presso-laminatoio perforatore
DE3328269A1 (de) * 1983-08-02 1985-02-21 Mannesmann AG, 4000 Düsseldorf Verfahren zum herstellen eines hohlkoerpers
DE3837399C1 (de) * 1988-11-01 1989-11-16 Mannesmann Ag, 4000 Duesseldorf, De
DE102012107041B4 (de) 2012-08-01 2014-05-15 Benteler Deutschland Gmbh Verfahren und Vorrichtung zur Herstellung eines metallischen Hohlblockes aus einem metallischen Block

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2791924A (en) * 1951-08-25 1957-05-14 Babcock & Wilcox Co Rotary piercing processes

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2791924A (en) * 1951-08-25 1957-05-14 Babcock & Wilcox Co Rotary piercing processes

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4052874A (en) * 1975-07-18 1977-10-11 Nippon Steel Corporation Method of producing tubular body in a press roll piercing mill
US4074557A (en) * 1975-10-30 1978-02-21 Nippon Steel Corporation Metal extrusion process with high reduction
US4341106A (en) * 1977-04-13 1982-07-27 Gleason Works Apparatus for controlling the movement of a reciprocatory hydraulically driven element of a metal forming machine
US4455849A (en) * 1980-04-21 1984-06-26 Nippon Steel Corporation Press-rolling process for producing a metal tubular product
US4674171A (en) * 1984-04-20 1987-06-23 Lor, Inc. Heavy wall drill pipe and method of manufacture of heavy wall drill pipe
US4771811A (en) * 1984-04-20 1988-09-20 Lor, Inc. Heavy wall drill pipe and method of manufacture of heavy wall drill pipe
WO1993018870A1 (en) * 1992-03-23 1993-09-30 Mosey George N Piercing mill for seamless tube manufacture
US5406820A (en) * 1992-03-23 1995-04-18 Mosey; George N. Piercing mill for seamless tube manufacture
RU2721253C1 (ru) * 2019-09-09 2020-05-18 Общество с ограниченной ответственностью "ФБТ" (ООО "ФБТ") Способ изготовления длинномерных пустотелых изделий и устройство для его реализации
US20210220884A1 (en) * 2020-01-20 2021-07-22 Yanshan University Dynamic Contact Heat Transfer Simulation Device for Rolling Heavy-Load Deformation Zone
US11705019B2 (en) * 2020-01-20 2023-07-18 Yanshan University Dynamic contact heat transfer simulation device for rolling heavy-load deformation zone

Also Published As

Publication number Publication date
AT258842B (de) 1967-12-11
NL6407605A (de) 1965-01-05
SE320042B (de) 1970-02-02
GB1008709A (en) 1965-11-03
BE649578A (de) 1964-10-16
DE1302427B (de) 1972-05-04

Similar Documents

Publication Publication Date Title
US3391561A (en) Process and apparatus for producing cylindrical tubular bodies from blooms
JP4893858B2 (ja) 冷間圧延による継目無金属管の製造方法
US4577481A (en) Process for production of seamless tube and apparatus for processing seamless tube
WO2009067045A1 (fr) Procédé de fabrication de tubes sans soudure de grand diamètre
US2063563A (en) Manufacture of extruded metal shapes by hot hydraulic extrusion
US2278325A (en) Process for finishing forgings
EP3365121B1 (de) Verfahren zur herstellung eines nahtlosen hochdruckzylinders aus edelstahl
US2356734A (en) Tube mill
US1365987A (en) Manufacture of gun-tubes and like tubular bodies
US3570582A (en) Process for manufacturing cylindrical tubular metal bodies
US3581384A (en) Method of producing seamless metal tubes
EP2521626B1 (de) Rohrwalzwerk und verfahren zum walzen von nahtlosen rohren
CN115055617A (zh) 一种油缸整体热加工成型方法
US2083698A (en) Push bench method and apparatus
US3561242A (en) Process for forming bottomed tubular members from metal blanks
US3462987A (en) Method of manufacturing closed end tubular products
US2063562A (en) Manufacture of extruded metal shapes by hot hydraulic extrusion
US2843919A (en) Cold rolling method of making hollow steel blades
CN101767108A (zh) 无缝钢管的周期轧制方法
US2819790A (en) Process for the manufacture of seamless tubes by the thrust bench method from open and perforated blanks
US2029508A (en) Method of making hollow articles
US1919637A (en) Tube manufacture
US1387924A (en) Method of manufacturing shells
US1970570A (en) Method and apparatus for tube manufacture
CN116890033B (zh) 一种管材制备方法