US3765222A - Die for hydrostatic extrusion of sections having elongated projections - Google Patents

Die for hydrostatic extrusion of sections having elongated projections Download PDF

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Publication number
US3765222A
US3765222A US00230896A US3765222DA US3765222A US 3765222 A US3765222 A US 3765222A US 00230896 A US00230896 A US 00230896A US 3765222D A US3765222D A US 3765222DA US 3765222 A US3765222 A US 3765222A
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United States
Prior art keywords
die
grooves
section
projections
longitudinal axis
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Expired - Lifetime
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US00230896A
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English (en)
Inventor
B Lundback
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ABB Norden Holding AB
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ASEA AB
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Publication date
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    • 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
    • B21C23/007—Hydrostatic extrusion
    • 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
    • B21C23/02—Making uncoated products
    • B21C23/04—Making uncoated products by direct extrusion
    • B21C23/08—Making wire, rods or tubes
    • B21C23/10—Making finned tubes

Definitions

  • ABSTRACT For producing rods having longitudinally or helically extending projections or ribs by hydrostatic extrusion, the billet is extruded through a die having grooves, with the bases of the grooves inclined towards the longitudinal axis of the die so as to cause the material being extruded to fill the grooves of the die completely.
  • the present invention relates to a die for manufacturing sections having longitudinal projections by means of hydrostatic extrusion of a billet through a die orifice of the desired cross section.
  • the projections may be parallel with the section or helical in shape.
  • the reason that the billet material does not completely fill out the grooves in the die which are to form the elongated projections is that between the cross-section of the die where the orifice is largest, i.e., the transition between a conicalinlet area and the bottom of the grooves forming the projections and the smallest cross-section of the die orifice there is an extreme elongation of the central part of the billet, which causes the part of the projection formed to stretch so that the height and width decrease'if the radial displacement of the billet material is insufficient.
  • the invention provides a solution to the abovementioned. problem of completely filling the grooves of the die which are to form the elongated projections and thus obtaining the correct measurements for the extruded section. It is characterised in that the grooves in the die to produce the elongated projections on the rod are shaped so that their bases incline towards the longitudinal axis of the die. The grooves may also be shaped so that their width decreases from the inlet side towards the smallest cross-section of the die opening. A radial or a radial and tangential decrease in dimensions is thus obtained. This gives successive radial and/or tangential compensation for the extension of the projections as the material is extended in the central part of the billet.
  • the first part of the die groove i.e., the part of the groove lying ahead of the smallest cross section of the die orifice.
  • the projections between the grooves of the die are bevelled in the area immediately ahead of the smallest cross section of the die orifice so that the stresses in the projections between the grooves of the die can be decreased somewhat, thus decreasing the risk of rupture.
  • FIGS. l and 2 show two examples of rod shaped products manufactured in dies according to the invention
  • FIG. 3 a section of a die previously used together with a billet and the product in the die
  • FIG. 4 a view of the die according to FIG. 3 from the inlet side
  • FIG. 5 a corresponding view of a die for extruding a section having the same cross-section but with the elongated projections running helically
  • FIG. 6 a section extruded in a die of previously known type showing how the measurements of this section differ from the cross-section of the die
  • FIG. 7 a section in perspective through a die according to the invention having radial compensation in the grooves
  • FIG. 8 a section through a die of the same type as that shown in FIG. 7 for producing a rod having four elongated projections
  • FIG. 9 a view from the inlet side of the die shown in FIG. 8, with a billet and the product in the die,
  • FIG. 10 a section through a rod produced in the die
  • FIG. 11 a die having tangential compensation in the grooves which are to form the ridges
  • FIG. 12 a view of the die according to FIG. 11 from the inlet side
  • FIG. 13 a section through a die having both radial and tangential compensation in the grooves which are to form the ridges
  • FIG. 14 a view from the inlet side of the die according to FIG. 13,
  • FIG. 15 a section through a die for producing a section having helical elongated projections with both radial and tangential compensation in the grooves forming the projections, 7
  • FIG. 16 a view from the inlet side of the die according to FIG. 15,
  • FIG. 17 a section through a die having bevelled projections between the grooves and FIG. 18 a view from the inlet side of the die according to FIG. 17.
  • FIG. 6 DESCRIPTION OF THE PREFERRED EMBODIMENTS shown in FIG. 6 which consists of a core part 11 and elongated projections 12 projecting from this core.
  • FIG. 6 the profile of the die is shown by broken lines 13.
  • a billet 14 is shown in the die, and this is shaped to the section .10.
  • the edges of the die hidden by the billet 14 are shown in broken lines.
  • dies for producing sections having straight projections l, 12 the sides of the grooves 8 are parallel to the longitudinal axis of the die, as shown in FIGS. 3 and 4.
  • the base of the groove is at a constant distance from the longitudinal axis of the die and the side surfaces of the groove form the same angle to the longitudinal axis of the die along the whole length of the groove.
  • the cross section is decreased uniformly in the conical inlet part 6 of the die from the diameter D to the diameter D which corresponds to the greatest measurement of the die opening, therefore within the vertical section A.
  • the material is shaped to the section with the core 11 having diameter D and projections 12. Even in the upper part of setion B the outermost part of the projections 12 are already properly formed.
  • the tops of the projections have the width H instead of the same width C as the groove 8.
  • the width of the projections at the tops will be C 2K H and will gradually increase to C towards the base of the projection on the section. The rod will therefore not have the same dimensions as the die opening.
  • FIGS. 7, 8 and 9 show a method of shaping dies so that a rod is obtained which has the same cross section as the die orifice, for example a rod 10 according to FIG. 10 with four elongated projections 12 around a core 11.
  • the base 15a of the groove 8 in the area L is parallel to the longitudinal axis of the die 5, but the base 15b in the upper area F inclines the amount E towards this axis.
  • the sides 16a and 16b of the groove 8 are parallel to the longitudinal axis. Because the radial distance of the groove to the centre of the die decreases in the direction of extrusion, what might be called a radial compensation is obtained, which gives radial compression of the material in the groove 8 which forms the projections 12 of the section 10.
  • FIGS. 11 and 12 show a die having grooves 8 to produce elongated projections, the bases 15 of the grooves being parallel to the longitudinal axis of the die.
  • the sides of the grooves in the section F of the die above the smallest cross-section of the die orifice incline towards the longitudinal axis of the die so that the width of the groove increases upwardly.
  • the material is pressed tangentially in towards the centre of the groove and compensation is obtained for the alteration in dimension which is obtained as the projections become extended. This may be called tangential compensation.
  • FIGS. 13 and 14 show a die constructed in such a way that both tangential and radial compensation are obtained.
  • the side surfaces and base surfaces have the same designations as in the preceding figures.
  • FIGS. 15 and 16 show a die according to FIGS. 13 and 14 modified to produce a section having four helically arranged elongated projections.
  • FIGS. 17 and 18 show a die according to FIGS. 13 and 14 which is modified in such a way that the projection 9 between the grooves of the die is somewhat bevelled at the transition from the conical surface of the die to its vertical orifice surface.
  • the projections 9 will therefore acquire a surface 19 which will form a more acute angle with respect to the axis of the die than the conical inlet surface 6.
  • the die according to the invention is applicable to all types of sections. That a die has been described which produces a section having only four elongated projections with flat sides is purely because the invention can be more clearly explained in this way.
  • the radial compensation i.e., the embodiment having an inclined groove base but parallel groove sides is most suitable from the lubrication point of view.
  • the radial compensation due to an inclined groove base is limited since at the first part of the die inlet opening within an area M there must be a conical sealing surface of a certain width.
  • the radial compensation which can be achieved is insufficient, it can be combined with tangential compensation, i.e., the sides of the grooves may be made inclined.
  • Die having an extrusion orifice with a substantially circular central opening and grooves communicating therewith for producing rods having a central core part and elongated projections extending from said core part, by means of hydrostatic extrusion, the bases of the grooves in the die being inclined towards the longitudinal axis of the die.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Extrusion Of Metal (AREA)
US00230896A 1971-12-30 1972-03-01 Die for hydrostatic extrusion of sections having elongated projections Expired - Lifetime US3765222A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
SE16884/71A SE361270B (enrdf_load_stackoverflow) 1971-12-30 1971-12-30

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SE (1) SE361270B (enrdf_load_stackoverflow)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4050279A (en) * 1976-07-13 1977-09-27 Western Electric Company, Inc. Apparatus and methods for forming an elongated product
JPS6245443A (ja) * 1985-08-23 1987-02-27 Rizumu Jidosha Buhin Seizo Kk シ−トベルト用巻取軸の冷間鍛造方法
EP1162014A3 (en) * 2000-06-09 2002-07-24 Aida Engineering Ltd. Pressure controlled fluid pressure extrusion method
US20040035168A1 (en) * 2000-06-09 2004-02-26 Aida Engineering Co., Ltd. Pressure controlled fluid pressure extrusion method
US20180369888A1 (en) * 2017-06-27 2018-12-27 North University Of China Method of forming a cup shaped aluminum magnesium alloy article by rotary extrusion
CN114210755A (zh) * 2021-12-21 2022-03-22 攀钢集团江油长城特殊钢有限公司 钢材管件挤压成型装置及管件挤压成型系统

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2461640A (en) * 1946-11-29 1949-02-15 Chase Brass & Copper Co Method of producing dies for extruding externally finned tubes
US3115249A (en) * 1958-07-07 1963-12-24 Reynolds Metals Co Extrusion system
US3267712A (en) * 1963-12-18 1966-08-23 Purpose Extruded Aluminum Inc Apparatus for forming spiraled extrusions
US3583204A (en) * 1967-06-30 1971-06-08 Asea Ab Means for hydrostatic extrusion
US3599469A (en) * 1968-08-19 1971-08-17 Lear Siegler Inc Apparatus for forming gears

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2461640A (en) * 1946-11-29 1949-02-15 Chase Brass & Copper Co Method of producing dies for extruding externally finned tubes
US3115249A (en) * 1958-07-07 1963-12-24 Reynolds Metals Co Extrusion system
US3267712A (en) * 1963-12-18 1966-08-23 Purpose Extruded Aluminum Inc Apparatus for forming spiraled extrusions
US3583204A (en) * 1967-06-30 1971-06-08 Asea Ab Means for hydrostatic extrusion
US3599469A (en) * 1968-08-19 1971-08-17 Lear Siegler Inc Apparatus for forming gears

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
High Pressure Forming by R. Khol; pp. 124 130 of Machine Design; January 9, 1969 *

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4050279A (en) * 1976-07-13 1977-09-27 Western Electric Company, Inc. Apparatus and methods for forming an elongated product
JPS6245443A (ja) * 1985-08-23 1987-02-27 Rizumu Jidosha Buhin Seizo Kk シ−トベルト用巻取軸の冷間鍛造方法
EP1162014A3 (en) * 2000-06-09 2002-07-24 Aida Engineering Ltd. Pressure controlled fluid pressure extrusion method
US20040035168A1 (en) * 2000-06-09 2004-02-26 Aida Engineering Co., Ltd. Pressure controlled fluid pressure extrusion method
US7284405B2 (en) 2000-06-09 2007-10-23 Aida Engineering Co., Ltd. Pressure controlled fluid pressure extrusion method
US20180369888A1 (en) * 2017-06-27 2018-12-27 North University Of China Method of forming a cup shaped aluminum magnesium alloy article by rotary extrusion
US10780478B2 (en) * 2017-06-27 2020-09-22 North University Of China Method of forming a cup shaped aluminum magnesium alloy article by rotary extrusion
CN114210755A (zh) * 2021-12-21 2022-03-22 攀钢集团江油长城特殊钢有限公司 钢材管件挤压成型装置及管件挤压成型系统

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