US3765221A - 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
US3765221A
US3765221A US00230816A US3765221DA US3765221A US 3765221 A US3765221 A US 3765221A US 00230816 A US00230816 A US 00230816A US 3765221D A US3765221D A US 3765221DA US 3765221 A US3765221 A US 3765221A
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United States
Prior art keywords
die
grooves
section
projections
sections
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Expired - Lifetime
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US00230816A
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English (en)
Inventor
J Nilsson
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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
    • B21C23/02—Making uncoated products
    • B21C23/04—Making uncoated products by direct extrusion
    • B21C23/08—Making wire, rods or tubes
    • B21C23/10—Making finned tubes
    • 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

Definitions

  • ABSTRACT In the hydrostatic extrusion of rods having ribs extending from a core part, extending longitudinally or helically, a billet is hydrostatically extruded through a die having grooves which decrease in width from the inlet die towards the smallest cross-section of the die opening, so that the grooves are filled with the material of the billet.
  • 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 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 width decreases from the inlet side towards the smallest cross-section of the die opening. A tangential decrease in dimensions is thus obtained, which gives successive tangential compensation for the extension of the projections as the material is extended in the central part of the billet. In dies for extruding sections having helical projections it may be suitable or necessary to have a smaller pitch in 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 may also be necessary or suitable to allow the pitch of the die groove to deviate somewhat from the pitch of the elongated projections in order to obtain the desired pitch.
  • the projections between the grooves of the die are bevelled in the area immediately before 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. 1 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 a 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 die having tagential compensation in the grooves which are to form the ridge
  • FIG. 8 a view of the die according to FIG. 11 from the inlet side
  • FIG. 9 a section through a rod produced in the die
  • FIG. 10 a section through a die for producing a section having helical elongated projections
  • FIG. 11 a view from the inlet side of the die accord- DESCRIPTION OF THE PREFERRED EMBODIMENTS
  • FIG. 1 shows a shaft having elongated projections 1 like splines around a core part 2.
  • the projections 1 are parallel to the shaft itself.
  • FIG. 2 shows a section having helically arranged projections 3 around a core part 4.
  • the projections are shaped so that the section can be used as a rotor in a compressor.
  • the die in FIGS. 3, 4 and 5 is of a type already known. It has a conical inlet part 6 and an opening 7 with grooves 8 and projections 9 between the grooves in order to produce the bar 10 shown in FIG.
  • FIG. 6 which consists of a core part 11 and elongated projections 12 projecting from this core.
  • 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.
  • 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 10 with the core 11 having diameter D; and projections 12. Even in the upper part of section B the outermost part of the projections 12 are already properly formed.
  • an extension is obtained.
  • Even the outermost, finished parts of the projections must be extended to the same extent as the rest of the material. In order to obtain a complete cross-section in spite of the extension, a radial material flux is required within the section B to keep the die groove 8 filled.
  • the tops of the projections have the width H instead of the same width C as the groove 8.
  • the dimension of the section will be D 2.4 D;, and not equal to the measurement D between the bases of two grooves 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 and 8 show a method of shaping the die so that a rod having the same cross section as that of the die opening is obtained, for example a rod according to FIG. 9 with four longitudinal ridges 12 about a core 11.
  • the bases of the grooves 8 are parallel to the longitudinal axis of the die 5, whereas the sides 16a, 16b are inclined with respect to this axis in the area F above, so that the width of the groove decreases in the direction of extrusion.
  • material is forced tangentially in towards the centre of the groove and compensation is therefore obtained for the alteration in dimensions which is otherwise obtained when the elongated projections are extended. This may be called tangential compensation.
  • FIGS. 10 and 11 show a die according to FIGS. 7 and 8 modified to produce a section having four helically arranged elongated projections.
  • FIGS. 12 and 13 shown a die according to FIGS. 7
  • 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.
  • Die having an extrusion orifice with a substantially circular opening and grooves communicating therewith for producing rods having elongated projections extending from a central core part, by means of hydrostatic extrusion, the grooves in the die decreasing in width from the inlet side towards the smallest crosssection of the die opening.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Extrusion Of Metal (AREA)
US00230816A 1971-03-19 1972-03-01 Die for hydrostatic extrusion of sections having elongated projections Expired - Lifetime US3765221A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
SE03545/71A SE350712B (enrdf_load_stackoverflow) 1971-03-19 1971-03-19

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US3765221A true US3765221A (en) 1973-10-16

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SE (1) SE350712B (enrdf_load_stackoverflow)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2325350A1 (en) * 2009-11-24 2011-05-25 Applied Materials, Inc. Anode rod for a sputtering system
CN104226703A (zh) * 2013-06-18 2014-12-24 上海工程技术大学 一种制作汽车拉杆接头的方法
CN108161126A (zh) * 2017-11-29 2018-06-15 江阴市永兴机械制造有限公司 一种花键挤刀及花键传动齿轮间歇的挤压方法

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
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

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
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

Non-Patent Citations (1)

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

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2325350A1 (en) * 2009-11-24 2011-05-25 Applied Materials, Inc. Anode rod for a sputtering system
CN104226703A (zh) * 2013-06-18 2014-12-24 上海工程技术大学 一种制作汽车拉杆接头的方法
CN108161126A (zh) * 2017-11-29 2018-06-15 江阴市永兴机械制造有限公司 一种花键挤刀及花键传动齿轮间歇的挤压方法

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Publication number Publication date
SE350712B (enrdf_load_stackoverflow) 1972-11-06

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