US3777528A - Method of hot piercing metal billets - Google Patents

Method of hot piercing metal billets Download PDF

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Publication number
US3777528A
US3777528A US00091120A US3777528DA US3777528A US 3777528 A US3777528 A US 3777528A US 00091120 A US00091120 A US 00091120A US 3777528D A US3777528D A US 3777528DA US 3777528 A US3777528 A US 3777528A
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US
United States
Prior art keywords
tool
punching
expansion
billet
pilot hole
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
US00091120A
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English (en)
Inventor
A Sirantoine
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.)
Cefilac SA
Original Assignee
Cefilac 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 Cefilac SA filed Critical Cefilac SA
Application granted granted Critical
Publication of US3777528A publication Critical patent/US3777528A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21J—FORGING; HAMMERING; PRESSING METAL; RIVETING; FORGE FURNACES
    • B21J5/00—Methods for forging, hammering, or pressing; Special equipment or accessories therefor
    • B21J5/06—Methods for forging, hammering, or pressing; Special equipment or accessories therefor for performing particular operations
    • B21J5/10—Piercing billets
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES, PROFILES OR LIKE SEMI-MANUFACTURED PRODUCTS OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
    • B21C23/00—Extruding metal; Impact extrusion
    • B21C23/01—Extruding metal; Impact extrusion starting from material of particular form or shape, e.g. mechanically pre-treated

Definitions

  • ABSTRACT A billet containing an axially cold drilled cylindrical pilot hole and previously heated to deformation temperature is inserted into a hot piercing press.
  • the pilot hole is flared at its forward end by a hot punching operation in the press itself prior to the application of the lubricant and the expansion operation.
  • the hot punching can be done by a punching tool or by an expansion tool and the force of the press can be transmitted tothe expansion tool in the expansion operation directly through a spindle or through the punching tool.
  • METHODOF HOT PIERCING METAL BILLETS My invention is directed to the hot piercing of metal billets, termed expansion. More particularly, it is directed to the expansion operation in which a pilot hole previously cold drilled into a billet is flared at its upper provides a satisfactory coaxiality ,of the pierced bore with the outside surface of the billet.
  • a pilot hole previously cold drilled into a billet is flared at its upper provides a satisfactory coaxiality ,of the pierced bore with the outside surface of the billet.
  • the billet have to be cold drilled, but the upper end of the cold drilled bore must be conically flared by machining, for example, on a lathe.
  • the present invention eliminates the machining operation while still forming the conical flare without any waste in time and material or investment in the necessary machining equipment employed heretofore.
  • my invention consists of conically flaring the forward end of the cylindrical pilot hole by using a punching tool. This operation is carried out in the piercing press employing the same driving force, i.e.,
  • the expansion tool itself is used for punching. After the conical flare has been punched the expansion tool is removed from the billet and a cohesive lubricant is positioned in the conical flare and then the expansion is carried out using the expansion tool.
  • the punching operation is done by a punching tool placed at the lower end of the spindle. After punching, the tool is removed and replaced by the expansion tool while a powdered lubricant is poured into the conical flare. The conical flare of the pilot hole is slightly greater than the conical surface of the expansion tool. The expansion is then carried out with the expansion tool.
  • the conical flare is impressed by a punching toolas in the second embodiment.
  • an expansion tool is positioned in the bore of the billet.
  • the expansion tool has a rearward end adapted to matingly engage the forward end of the punching tool.
  • the punching tool has a maximum diametersmaller than that of the expansion tool, it is not removed from the spindle, but is moved forward to matingly engage the expansion tool and then expansion is carried out.
  • FIG. 1 is a section through a piercing press container in which a punching tool is engaging the pilot hole of the billet;
  • FIG. 2 is a section through a container of a piercing press in which an expansion tool and a punching tool are employed in mating engagement.
  • the punching of the conical flare can be done by the expansion tool itself when the lubricant is in the form
  • the press is initially equipped with the expansion tool, according to known practice.
  • FIG. 1 is illustrative of the use of a punching tool 4 as described hereinafter, it is also illustrative of an expansion tool if one considers numeral 4 as being directed to an expansion tool.
  • the force of the press is then applied until the expansion tool has punched a hole, e.g. 50 mm (2 inches) in diameter, on the upper face of the billet.
  • the spindle and the expansion tool are withdrawn and the cohesive mass of lubricant is placed in the conical flare.
  • the cohesive mass of lubricant can be, for example, a cohesive glass sheet such as a flexible sheet or a woven glass fiber or a cone of agglomerated glass powder such as that taught by US. Pat. application No. 11187 dated Feb. 13, 1970.
  • the force of the press is once more applied and the expansion occurs in a known manner. Internal cohesion of the lubricating mass insures its continuous presence during the whole expansion operation.
  • the punching tool 4 includes in turn, a nose section 5 capable of running into the pilot hole 6 of billet 1 without deforming it, a working surface 7 slightly more open that that of the expansion tool which will be used subsequently, and a cylindrical part having the same diameter as the spindle 3.
  • the spindle 3 has transmitted the force of the press to the punching tool 4, forcing thepunching tool 4 into the forward end of the billet to such an extent that the diameter of the resultant conical flare 20 at its upper end is about 50 mm- (2 inches).
  • the sequence of operations of this embodiment includes punching a conical flare 20 in the forward end of the pilot hole 6, withdrawing the punching tool 4, placing a lubricating powder such as that taught by US. Pat. No. 2,956,337 into the conical flare created by the working surface 7 of punching tool 4, replacing the punching tool 4 with an expansion tool attached to the spindle 3 through the connecting device 8 and exerting the force of the press through the spindle 3 to force the expansion tool through the whole length of the billet in a known manner.
  • Expansion tool 10 has a recessed rearward section 12 which is dimensioned to matingly engage with the nose section 5' of punching tool 4'.
  • Expansion tool llfl has amaximum diameter which is equal to the desired expansion diameter and is larger than the diameters of both spindle 3' and the tool 4'.
  • a method of hot piercing metal billets having an axially cold drilled cylindrical pilot hole, and previously heated to deformation temperature comprising:

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Extrusion Of Metal (AREA)
  • Forging (AREA)
US00091120A 1969-11-27 1970-11-19 Method of hot piercing metal billets Expired - Lifetime US3777528A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR6940970A FR2067226A1 (OSRAM) 1969-11-27 1969-11-27

Publications (1)

Publication Number Publication Date
US3777528A true US3777528A (en) 1973-12-11

Family

ID=9043733

Family Applications (1)

Application Number Title Priority Date Filing Date
US00091120A Expired - Lifetime US3777528A (en) 1969-11-27 1970-11-19 Method of hot piercing metal billets

Country Status (6)

Country Link
US (1) US3777528A (OSRAM)
AT (1) AT304229B (OSRAM)
DE (1) DE2057386B2 (OSRAM)
ES (1) ES385749A1 (OSRAM)
FR (1) FR2067226A1 (OSRAM)
GB (1) GB1313370A (OSRAM)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS50123069A (OSRAM) * 1974-03-18 1975-09-27
US4129022A (en) * 1976-08-03 1978-12-12 Mannesmann Aktiengesellschaft Piercing a solid billet
US4876868A (en) * 1988-02-13 1989-10-31 W. C. Heraeus Gmbh Method for forming an object of metal by cold pressing
US4966023A (en) * 1987-08-13 1990-10-30 Agence Regionale De Developpements Technologiques Staged tool for boring a hole in an element by axial penetration of the tool
CN110976544A (zh) * 2019-12-18 2020-04-10 攀钢集团江油长城特殊钢有限公司 一种热挤压坯料扩孔工艺

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1948400A (en) * 1931-11-02 1934-02-20 Hydraulik Gmbh Metal extrusion press
CH193142A (de) * 1936-10-28 1937-09-30 Lutz Arthur Versenker.
US2183182A (en) * 1936-12-14 1939-12-12 Wolverine Tube Company Centering device for extruding presses
US2344803A (en) * 1940-10-15 1944-03-21 Ajax Mfg Co Method of forging shovel sockets and the like
GB729317A (en) * 1951-04-18 1955-05-04 Fritz Bernard Hatebur An improved method of and means for mass producing articles provided with at least one step on the outside thereof, particularly sparking plug casings
US2956337A (en) * 1955-08-24 1960-10-18 Cefilac Method of boring metals
DD298426A5 (de) * 1989-07-19 1992-02-20 ������@������������k�� Verfahren zur herstellung von neuen plasmiden und deren verwendung bei der gewinnung eines plasminogenaktivators

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1948400A (en) * 1931-11-02 1934-02-20 Hydraulik Gmbh Metal extrusion press
CH193142A (de) * 1936-10-28 1937-09-30 Lutz Arthur Versenker.
US2183182A (en) * 1936-12-14 1939-12-12 Wolverine Tube Company Centering device for extruding presses
US2344803A (en) * 1940-10-15 1944-03-21 Ajax Mfg Co Method of forging shovel sockets and the like
GB729317A (en) * 1951-04-18 1955-05-04 Fritz Bernard Hatebur An improved method of and means for mass producing articles provided with at least one step on the outside thereof, particularly sparking plug casings
US2956337A (en) * 1955-08-24 1960-10-18 Cefilac Method of boring metals
DD298426A5 (de) * 1989-07-19 1992-02-20 ������@������������k�� Verfahren zur herstellung von neuen plasmiden und deren verwendung bei der gewinnung eines plasminogenaktivators

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS50123069A (OSRAM) * 1974-03-18 1975-09-27
US4129022A (en) * 1976-08-03 1978-12-12 Mannesmann Aktiengesellschaft Piercing a solid billet
US4966023A (en) * 1987-08-13 1990-10-30 Agence Regionale De Developpements Technologiques Staged tool for boring a hole in an element by axial penetration of the tool
US4876868A (en) * 1988-02-13 1989-10-31 W. C. Heraeus Gmbh Method for forming an object of metal by cold pressing
CN110976544A (zh) * 2019-12-18 2020-04-10 攀钢集团江油长城特殊钢有限公司 一种热挤压坯料扩孔工艺

Also Published As

Publication number Publication date
AT304229B (de) 1972-12-27
GB1313370A (en) 1973-04-11
FR2067226A1 (OSRAM) 1971-08-20
DE2057386A1 (de) 1971-06-09
DE2057386B2 (de) 1973-06-14
ES385749A1 (es) 1973-04-16

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