US3570297A - Die and method for drawing metal tubes - Google Patents

Die and method for drawing metal tubes Download PDF

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Publication number
US3570297A
US3570297A US760823A US3570297DA US3570297A US 3570297 A US3570297 A US 3570297A US 760823 A US760823 A US 760823A US 3570297D A US3570297D A US 3570297DA US 3570297 A US3570297 A US 3570297A
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tube
die
mandrel
ring
tapered
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Raymond A Matthews
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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 OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
    • B21C37/00—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape
    • B21C37/06—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape of tubes or metal hoses; Combined procedures for making tubes, e.g. for making multi-wall tubes
    • B21C37/15—Making tubes of special shape; Making tube fittings
    • B21C37/16—Making tubes with varying diameter in longitudinal direction
    • B21C37/18—Making tubes with varying diameter in longitudinal direction conical tubes
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
    • B21C3/00—Profiling tools for metal drawing; Combinations of dies and mandrels
    • B21C3/02—Dies; Selection of material therefor; Cleaning thereof
    • B21C3/06—Dies; Selection of material therefor; Cleaning thereof with adjustable section

Definitions

  • a tube t be tapered is telescoped onto a tapered mandrel and inserted in the die, and the chamber is filled with fluid under substantially constant pressure that is maintained by a relief valve or an accumulator, while the tube is drawn through the die, the pressure being sufiicient to collapse the tubing initially around the mandrel and then to iron the tubing smoothly onto the mandrel during drawing.
  • the ends of the die flare arcuately away from the central land, which is the area of minimum diameter of the orifice and is formed on a yieldable annulus having a wall thickness increasing progressively in each direction from the land area.
  • Tubing is tapered from either end of the mandrel, using a reversely tapered mandrel extension when the die is to be guided onto the larger end, and a modified form of the case has axially rigid, radially yieldably bracing fingers in the groove around the spool.
  • This invention relates generally to the drawing of sections of metal tubing through die assemblies to change the cross-section of the tubing, and has particular reference to a method and die assembly primarily intended for the drawing of metallic tube sections from a substantially uniform starting diameter to a tapered finished form.
  • the primary object of the present invention is to provide an improved method and die assembly for drawing ductile metal tubing onto tapered mandrels for a smooth, continuous taper and constant wall thickness, using a variable orifice die that is capable of tapering a large number of workpieces and is highly versatile with respect to the sizes, tapers and materials that can be handled.
  • Another object is to provide an improved method and die assembly that are readily adaptable and repeatedly usable for tapering both from small-to-large and from large-tosrnall, and having much greater production capabilities than prior expansible dies.
  • Still another object is to eliminate the need for complicated machinery and special lubricants required by conventional tapering processes, and also to avoid circumferential distribution of defects in the tubing.
  • ⁇ the objective of the invention may be summarized as the provision of a commercially practical die and method for mass-production tapering of tubing of various types and sizes in which a single die is usable for a prolonged period without rupturing, hardening or other adverse affect on the die.
  • the present invention is based upon the discovery that specially shaped rings of non-metallic plastic materials, such as hard and tough nylon which has long been known and available to the trade, are hard enough, when properly formed and backed with substantially uniform pressure, to collapse ductile metal tubing of various cornpositions and wall thicknesses around tapered mandrels, and to draw a tube smoothly to the taper of the mandrel with very low friction between the die ring and the tubing.
  • such rings are capable of repeated plastic expansion and contraction within a substantial range of movement without rupturing or work-hardening.
  • the invention also resides in the special configuration of the die ring, the backing of the ring with fluid pressure that is maintained substantially constant in a very simple maner as the orifice of the die changes with the diameter of the tubing, and in the bracing of the die for special heavy-duty drawing operations.
  • FIG. l is a fragmentary side elevational view of a tubedrawing apparatus including a die assembly embodying the novel features of the present invention and illustrating the first step of the method, parts of the apparatus being broken away and some parts being shown in cross-section for clarity of illustration.
  • FIG. 2 is a fragmentary side elevation generally similar to part of FIG. l showing the entire length of the tube to be drawn, and partly broken away and shown in crosssection.
  • FIG. 3 is an enlarged fragmentary cross-sectional view of the die assembly as shown in FIGS. l and 2.
  • FIG. 4 is an enlarged fragmentary cross-sectional view of parts shown in FIG. 2 with the parts moved to the position indicated by the line 4-4 of FIG. 2, and illustrating a condition of the die ring that is believed to occur in use.
  • FIG. 5 is a view similar to FIG. 4 with the parts moved to the position indicated by the line 5-5 of FIG. 2.
  • FIG. 6 is an enlarged break-away side elevation of a representative mandrel.
  • FIG. 7 is an enlarged break-away side elevation of a representative Section of tubing to be tapered, the tube section being shown partly in cross-section.
  • FIG. 8 is a break-away side elevation of the tube section after tapering and finishing operations.
  • FIG. 9 is a view similar to FIG. 2, and primarily in cross-section, showing the die assembly in condition for beginning of the tapering of a tube section from the larger end toward the smaller end.
  • FIG. 10 is a view similar to FIG. 9 illustrating an intermediate position and condition of the die assembly in the tapering of the tube section.
  • FIG. 11 is a View similar to part of FIG. 10 but showing the condition of the die assembly near the end of the tapering operation.
  • FIG. 12 is a cross-sectional view taken in a perpendicular transverse plane through a modied form of the die assembly having special bracing elements.
  • FIG. 13 is a cross-section taken substantially along the line 13-13 of FIG. 12.
  • FIG. 14 is an enlarged perspective view of one of the bracing elements.
  • the invention is embodied in a die assembly 10 mounted on a post 11 upstanding from a conventional horizontal draw bench 12 with a section 13 of tubing telescoped onto a tapered mandrel 14 ready to be drawn.
  • one end portion 15 of the tube section is pointed to a reduced diameter so as to extend loosely through a die ring 17 in the die assembly and into a horizontal bore 18 in the post, where it is gripped in a chuck 19' on the end of a rod 20 connected at 21 to the reciprocating piston rod 22 of a horizontal hydraulic cylinder 23.
  • the cylinder 23 is pivotally anchored at 24 on the lefthand portion of the bench 12 so that admission of uid under pressure to the right end portion of the cylinder through a supply line 25 shifts the piston rod 22 to the left to draw the chuck 19 to the left and pull the tube 13 through the die ring 17.
  • a second fluid line 27 is connected to the left end of the cylinder to effect the return stroke of the piston rod.
  • the tube 13 and mandrel 14 are pulled together through the die assembly 10, which herein is held stationary in a recess 28 in the right side of the post 11.
  • the tube is sized and shaped by the tone of the die ring 17 around the mandrel inside the tube.
  • the die ring 17 is composed of relatively hard and tough, non-metallic plastic material capable of expanding and contracting repeatedly in annular form within a substantial range without rupturing or hardening, and has a central through-passage (see FIG. 3) including a land 29 between the ends of the passage and a bell 30' flaring from the land toward the entry end. Moreover, a substantially constant compressive force is uniformly distributed around a radially yieldable annulus 31 of plastic material having the land on its inside surface, and the die ring as a whole is rigidly supported within the die assembly 10 against axial yielding under the drawing force exerted by the cylinder 23.
  • the die assembly and method of the present invention have the demonstrated ability to taper ductile tubing sections of different thicknesses and compositions effectively over prolonged periods of production use.
  • the die ring 17 is in the form of a nylon spool having axially spaced, annular flanges or heads 32 (see FIGS. 3-5) at the ends of the spool, separated by a peripheral groove 33 formed with a curved bottom surface 34 (FIG. 3), the groove preferably being generally centered axially of the spool.
  • the through-passage constituting the variable orifice of the die extends axially through the spool with the bell 30 in the right end portion of the passage and a relief 3S in the left end portion, the bell and the relief herein being virtually identical and flaring arcuately in both directions away from the central land 29.
  • the curvature of the bell coupled with the curvature of the bottom surface 34 of the groove 33, enhances the operation of the die ring 17 by producing the progressive rolling action of the land, as previously mentioned and illustrated in FIGS. 4 and 5.
  • the land 29 initially is a circular line where the bell 30 and relief 35 merge with a smooth curvature, as indicated in FIG.
  • the yieldable annulus 31 has been designed with the narrowest section backing the original land and the thickness increasing gradually to the right from this section toward the entry end of the passage. It will be seen that this is achieved by centering the curvature of the bottom surface 34 of the groove 33 on the arcuate inner surface of the bell 30 and the yieldable annulus, both centers lying generally in a plane perpendicular to the axis of the ring and the groove being narrower than the annulus.
  • the result is the rolling, travelling action of the land which remains relatively narrow ywhile the central portion of the passage Wall lifts itself out of rubbing engagement with the portion of the tube thait already has been tapered, as shown in FIGS. 4 an 5.
  • the preferred means for applying uniform backing force to the exible annulus 31 is fluid pressure.
  • the die assembly 10 ⁇ includes a case encircling the ring and cooperating twith the groove 33 to define a sealed chamber encircling the annulus to confine fluid under pressure, from a suitable source such as a pump (not shown), around the annulus.
  • the case comprises a cylindrical body 37 of the same length as the spool and having an inside diameter sized to receive the spool heads 32 with a tight iit, and a pair of circular end rings 38 secured by bolts 39 to the ends of the case body and formed with center holes 40 larger than the diameter of any part that is to pass through the die assembly.
  • the spool may be made somewhat oversize and compressed within the case by the clamping action of the bolts.
  • a supply line 41 from the pressure source opens into the case and into the groove chamber 33 therein through a fitting 42 screwed into an inlet port 43 in the body 37 in axial alignment with the groove 33.
  • the backing pressure produced in the chamber is controlled during tapering from the smaller end toward the larger end by means of a pressure relief valve 44 (FIG. l) for draining uid from the chamber as the outward buckling and expansion of the yieldable annulus 31 tends to increase the pressure.
  • the pressure is maintained substantially constant, automatically as an incident to the changes in the volume of the chamber.
  • a tube-drawing operation may be started by placing a conventional mandrel 14, as shown most clearly in FIG. 6, inside a pointed tube 13 of the type shown in FIG. 7, the sizes of the mandrel and tube being correlated so that the larger end of the mandrel ts closely in the unpointed end of the tube with a stem 45 on the smaller end of the mandrel disposed within the pointed portion of the tube. Then the pointed portion is inserted through the die ring 17, as shown in FIGS. 1 and 2, and is gripped in the chuck 19, ready to be drawn, with the smaller end portion of the mandrel within the land 29.
  • the pressure within the chamber 33 should be relieved for free insertion of the tube 13 in the relaxed die ring 17. Then the die assembly is pumped up to contract the land 29 against the tube with sufficient pressure to collapse the tube firmly against the mandrel 14. It should be noted that it is possible to apply pressure sufficient to clamp the tube against the mandrel so tightly that the drawing force on the tube will exceed the tensile strength of the tube. If this happens, a tube can be torn apart. Accordingly, the pressure applied should be limited to that which is sucient to collapse the tube and to continue such collapsing as the tube is drawn.
  • the appropriate pressure will lvary with the thickness and composition of the tubing.
  • a relatively thin-walled aluminum tube such as ⁇ 6061-T6, 0.060 of an inch thick, being tapered from one inch to one-half inch
  • a pressure on the order of 5,000 p.s.i. in the 'die assembly has been sufficient
  • a thicker-walled tube composed of steel may require pressure on the order of 20,000-2J5,000 p.s.i., or higher.
  • Experience with a particular type of tubing quickly indicates the suitable pressure range.
  • the draw cylinder 23 is actuated to pull the tube 13 and the mandrel 14 as a unit through the die ring 17. Since the pressure is sufficient to collapse the tube, all of the tube wall is cammed and guided into the bell 30 of the die ring with a smooth, rolling action as shown at 47 in FIG. 4, and is ironed out onto the mandrel by the ring. As the diameter of the tapered portion of the tube grows, the minimum diameter of the die passage must grow correspondingly, and the original land area buckles outwardly away from the tube, as shown at 48 in FIG. 4, while the effective land progresses along the bell toward the entry end of the passage. Consequently, the actual area or band of tight, pressing engagement between the die ring and the tube remains relatively narrow.
  • the pointed end portion 15 of the tube 13 is trimmed off to form a completed tube 13a, shown in lFIG. ⁇ 8, having the desired taper according to the taper of the mandrel used. Circumferential distribution of any minor defects that may have been present in the original tube blank has been avoided, and the tapered wall has the same thickness as the wall of the original blank.
  • the die ring now is returned to its original condition by changing the pressure in the chamber, and the die assembly 10l is ready for another draw.
  • FIGS. 9-11 Shown in FIGS. 9-11 is a die assembly that is identical to that shown in FIGS. l-5, the basic parts being indicated -with the same reference numbers. In this instance, however, the drawing operation is started adjacent the larger end of a mandrel 14 and progresses toward the smaller end. The only significant differences in this method of operation are the anchoring of the tube 13 to the larger end of the mandrel, and the use of a reVersely-tapered guide section 49 fastened to the larger end as a coaxial extension to which the stem 50 is connected.
  • the guide extension 49 has a coaxial counterbore 51 forming a seat in its larger end for receiving the larger tend of the mandrel with a clearance rit.
  • a threaded stud 52 holds the two securely together, and the end of the tube 13 is clamped snugly in the clearance between the mandrel and the extension.
  • the yieldable annulus now is contracted progressively around the tube and the mandrel, by the backup pressure in the groove chamber 33t, and the land area travels progressively away from the entry end of the die passage as the diameter of the work decreases, returning substantially to the normal, contracted condition as the smaller end of the mandrel is drawn through the ring, as shown in FlIG. 11.
  • a conventional accumulator 53 (FIG. 9) may be used to supply additional uid to the chamber at the selected pressure.
  • the primary advantage of this method of operation is the elimination of the need for a tube-pointing operation preparatory to drawing.
  • the die ring 17 will, of course, be designed for higher backing pressures and with correspondingly thicker wall sections in the yieldable annulus 31. More rigid plastic materials also may be used-for example, with ber reinforcement of the type used in the material sold as NylaiL In addition to sustaining the higher backing pressures, the die ring must withstand the greater axial forces tending to pull the land area through the die with the tube.
  • the die assembly 10 also may be modified, in the manner shown in FIGS. 12-14, with a plurality of radially movable, axially rigid braces 54 distributed around the die ring 17.
  • these braces are sheet metal ngers shown most clearly in FIG. 14 as being of U-shaped transverse cross-section and being pivoted at their outer ends on pins 55 spanning the sidewalls of a groove 57 in the body 37a of the case.
  • the fingers preferably are urged counterclockwise (FIG. 12) about the pivot pins 55 by suitable spring means (not shown) which hold the free ends yieldably under light spring pressure against the bottom wall 34 of the groove 33 around the die ring and is closefitting relation with the adjacent walls of the heads 32 on the spool.
  • the radially free ends of the lingers 54 are positioned close to the yieldable annulus 31 to resist axial deformation of the land, throughout the operation, while being movable radially so as to avoid interference with proper radial yielding of the die ring 17.
  • the construction and operation of the modified die assembly are the same as those previously described.
  • hard nylon is a suitable material for use in the die ring
  • reinforced nylon such as that sold as Nylafil has even higher ultimate yield strength for resisting failure under the forces to which the ring is subjected, these forces being the fiuid pressure introduced into the die assembly, the overall axial force tending to pull the ring out of the case and, most importantly, the axial extruding force to which the land area is subjected as a tube is drawn through the ring.
  • the key characteristics of the die material are the ability to expand and contract repeatedly through the range necessary for a particular drawingy operation, and sufficient hardness and strength or toughness to transmit the backing pressure to the tubing without failing axially as the tubing is drawn.
  • the die material should have a low coefficient of friction to minimize the drag and heat accompanying the drawing operation.
  • simple bar soap has been used as a satisfactory lubricant, whereas many conventional drawing operations are believed to require complex and sophisticated lubricant mixtures.
  • the material sold as Bunting Cadco is a preferred hard nylon for the die ring. It is believed that Delrin also will be satisfactory, and that there are various other plastic materials with the proper physical characteristics for the present invention. In view of the teachings herein, particular materials will suggest themselves to those skilled in the plastics art.
  • the present invention provides both an improved die assembly and a novel tube-drawing method using an expansible and contractible die ring 17, backed by uniformly distributed pressure, to collapse a tube 13 around a mandrel 14 into a desired form as the tube and mandrel are moved endwise through the die ring, the backing pressure ⁇ being maintained substantially constant throughout the draw.
  • the die ring is reusable many times for economical and efficient mass-production of tapered tubing, in contrast to prior sacrificial dies or other expansible metal dies that have limited reusabiilty at best. The result is a highly versatile die assembly that is believed to be a significant advance in the art.
  • non-metallic plastic material capable of stretching radially and being contracted back to original annular form repeatedly and Iwithin the range of said diameter change without rupturing or hardening, said spool having a central through-passage of circular cross-section including a central land, a curved entrance ⁇ bell flaring from said land toward one end of the passage, and a relief diverging from said land t0- ward the other end of the passage,
  • said case having at least one port for admitting pressure fluid into said chamber;
  • a die assembly as defined in claim 1 further including means on said case directly bracing said bottom surface against axial yielding while permitting free radial yielding thereof.
  • bracing means comprise a plurality of fingers pivotally supported on said case around said groove and having radially swingable free end portions pressing yieldably against said bottom surface.
  • a die assembly for drawing a ductile metal tube of substantially constant diameter onto a tapered mandrel and into a tapered tube conforming to the taper of the mandrel, said die assembly comprising:
  • annular die ring composed of relatively hard nonmetallic plastic material capable of stretching and being contracted .back to original form repeatedly and within a substantial range of movement without rupturing or hardening, said ring having a central through-passage of circular cross-section including a bell at one end converging to an internal land at the area of minimum diameter of said passage, and
  • said die ring having a peripheral groove circumferentially around said ring and forming a radially yieldable annulus encircling said land and having a peripheral outside surface;
  • said plastic material having suliicient mechanical strength to resist substantial axial deformation of said land during such movement whereby the tube is ironed smoothly out onto said mandrel into the tapered form of the latter while said land yields under said preselected pressure to conform to the changing diameter of the tube.
  • a die assembly as defined in claim S in which said annulus is of minimum thickness at said land and increases progressively in thickness to-ward said one end whereby the increasing diameter of said mandrel causes said annulus to buckle outwardly and the land area of said passage to travel along said inside surface toward said one end.
  • a die assembly for use in drawing a tube comprising:
  • annular die ring composed of relatively hard nonmetallic plastic material capable of being stretched and contracted in annular form repeatedly within a substantial range of movement without rupturing or hardening, said ring having a central through-passage including a bell at one end converging to a land,
  • a die assembly as defined in claim 7 in which said land is centrally located within said annulus, and said inside surface flares arcuately in both directions therefrom, said annulus having its minimum thickness at said and progressively increasing in thickness along said bell.
  • a die assembly for drawing a ductile metal tube comprising:
  • annular die spool composed of non-metallic plastic having properties of hardness, repeated deformability and low coeicient of friction similar to nylon so as to be capable of being stretched radially and contracted back to original annular form repeatedly and within a substantial range, said spool having a through-passage of circular cross-section including a central land and a curved entrance bell flaring from said land toward one end of said through-passage,
  • annular die spool having a through-passage including a central land and a curved entrance bell aring from said land toward one end of said through passage
  • said spool being composed of relatively hard nonmetallic plastic material capable of stretching and being contracted back to original form repeatedly and within a. substantial range of movement without rupturing or hardening, and having suiciently low coeicient of friction and high mechanical strength to resist axial deformation during drawing of a tube.
  • a die assembly as defined in claim 10 in which said groove has a bottom wall that is curved in axial crosssection, the curvatures of said bottom wall and of said entrance bell cooperating to reduce the thickness of said ring progressively toward said land to a minimum thickness adjacent said land.
  • a die assembly as dened in claim 13 in which said case also seals against said heads to form a pressure chamber defined in part by said groove and in part by said case.
  • a die assembly as defined in claim 10 in which the surface of said through-passage is smoothly curved from said entrance bell to said land and similarly but reversely curved beyond said land to form a relief, said groove having a curved bottom surface generally centered on the curvature of said bell and said relief, and of narrower width, whereby the thickness of said spool increases progressively in both directions from said land. 16.
  • the method of forming a tube on a tapered mandrel to taper the tube according to the taper of the mandrel comprising the steps of positioning a tube in telescoped relation with a tapered mandrel with the tube and the smaller end of the mandrel within a flexible die ring composed of relatively hard non-metallic plastic material capable of expanding and contracting repeatedly in annular form and having a peripheral groove; confining fluid in a chamber around the groove under sufficient pressure exerted on the ring through the groove to contract the ring around the tube and collapse the tub-e rmly against the mandrel;
  • a tube in a telescoped relation with a tapered mandrel with the tube and the larger end portion of the mandrel within a llexible die ring composed of relatively hard non-metallic plastic capable of expanding and contracting repeatedly in annular form and having a peripheral groove; conning fluid in a chamber around the groove under suflicient pressure exerted on the ring through the groove to contract the ring around the tube and collapse the 'tube firmly against the mandrel;

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Metal Extraction Processes (AREA)
  • Shaping By String And By Release Of Stress In Plastics And The Like (AREA)
  • Shaping Of Tube Ends By Bending Or Straightening (AREA)
US760823A 1968-09-19 1968-09-19 Die and method for drawing metal tubes Expired - Lifetime US3570297A (en)

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US76082368A 1968-09-19 1968-09-19

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US (1) US3570297A (fr)
JP (1) JPS5028912B1 (fr)
BE (1) BE739132A (fr)
BR (1) BR6912563D0 (fr)
DE (1) DE1945591A1 (fr)
ES (1) ES371280A1 (fr)
FR (1) FR2018435A1 (fr)
GB (1) GB1220766A (fr)
NL (1) NL6914242A (fr)

Cited By (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3701270A (en) * 1970-12-03 1972-10-31 Raymond A Matthews Method of drawing metal tubes
US3709020A (en) * 1970-05-14 1973-01-09 Babcock & Wilcox Co Method of and apparatus for producing a straight bore cold drawn tube
US3713318A (en) * 1971-01-14 1973-01-30 Reynolds Metals Co Apparatus for and method of forming a tubular metal blank into a tapered tube on a tapered mandrel
US3713319A (en) * 1971-01-19 1973-01-30 Reynolds Metals Co Apparatus for and method of forming a tubular metal blank into a tapered tube on a tapered mandrel
US3735616A (en) * 1969-11-27 1973-05-29 Pirelli General Cable Works Method of and apparatus for corrugating tubing
US3739616A (en) * 1971-09-21 1973-06-19 Reynolds Metals Co Apparatus for and method of forming a tubular metal blank into a tapered tube on a tapered mandrel
US3810372A (en) * 1971-11-05 1974-05-14 Alusuisse Die
US3889511A (en) * 1972-03-15 1975-06-17 Gemmer France Method of making a controlled torque connecting member
US3916664A (en) * 1970-07-09 1975-11-04 United States Steel Corp Starting tubes through a drawing die
US4072034A (en) * 1972-05-09 1978-02-07 National Research Development Corporation Method and apparatus for forming material by forcing through a die orifice
US4566300A (en) * 1982-03-26 1986-01-28 Gebelius Sven Runo Vilhelm Method for the manufacture of a conical tubular member
US5074555A (en) * 1989-04-24 1991-12-24 Sandvik Special Metals Corp. Tapered wall shaft with reinforced tip
US20060157539A1 (en) * 2005-01-19 2006-07-20 Dubois Jon D Hot reduced coil tubing
US20150101828A1 (en) * 2013-10-11 2015-04-16 Schlumberger Technology Corporation Tube Forming Device
CN118023319A (zh) * 2024-04-11 2024-05-14 江苏熊火机械制造有限公司 双链式7线自动拉拔机

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2043414C2 (de) * 1970-09-02 1982-06-16 Licentia Patent-Verwaltungs-Gmbh, 6000 Frankfurt Wasserenthärtungsvorrichtung für Wasch- und Geschirrspülmaschinen
GB1434533A (en) * 1972-05-09 1976-05-05 Nat Res Dev Method and apparatus for deforming the section of a workpiece
JPS5566285U (fr) * 1978-10-30 1980-05-07
JPS5737188U (fr) * 1980-08-12 1982-02-26
JPS63162187U (fr) * 1987-04-13 1988-10-24

Cited By (16)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3735616A (en) * 1969-11-27 1973-05-29 Pirelli General Cable Works Method of and apparatus for corrugating tubing
US3709020A (en) * 1970-05-14 1973-01-09 Babcock & Wilcox Co Method of and apparatus for producing a straight bore cold drawn tube
US3916664A (en) * 1970-07-09 1975-11-04 United States Steel Corp Starting tubes through a drawing die
US3701270A (en) * 1970-12-03 1972-10-31 Raymond A Matthews Method of drawing metal tubes
US3713318A (en) * 1971-01-14 1973-01-30 Reynolds Metals Co Apparatus for and method of forming a tubular metal blank into a tapered tube on a tapered mandrel
US3713319A (en) * 1971-01-19 1973-01-30 Reynolds Metals Co Apparatus for and method of forming a tubular metal blank into a tapered tube on a tapered mandrel
US3739616A (en) * 1971-09-21 1973-06-19 Reynolds Metals Co Apparatus for and method of forming a tubular metal blank into a tapered tube on a tapered mandrel
US3810372A (en) * 1971-11-05 1974-05-14 Alusuisse Die
US3889511A (en) * 1972-03-15 1975-06-17 Gemmer France Method of making a controlled torque connecting member
US4072034A (en) * 1972-05-09 1978-02-07 National Research Development Corporation Method and apparatus for forming material by forcing through a die orifice
US4566300A (en) * 1982-03-26 1986-01-28 Gebelius Sven Runo Vilhelm Method for the manufacture of a conical tubular member
US4662143A (en) * 1982-03-26 1987-05-05 Gebelius Sven Runo Vilhelm Method for the manufacture of a conical tubular member, and a member manufactured according to the method
US5074555A (en) * 1989-04-24 1991-12-24 Sandvik Special Metals Corp. Tapered wall shaft with reinforced tip
US20060157539A1 (en) * 2005-01-19 2006-07-20 Dubois Jon D Hot reduced coil tubing
US20150101828A1 (en) * 2013-10-11 2015-04-16 Schlumberger Technology Corporation Tube Forming Device
CN118023319A (zh) * 2024-04-11 2024-05-14 江苏熊火机械制造有限公司 双链式7线自动拉拔机

Also Published As

Publication number Publication date
DE1945591A1 (de) 1970-03-26
BE739132A (fr) 1970-03-02
FR2018435A1 (fr) 1970-05-29
ES371280A1 (es) 1972-04-01
NL6914242A (fr) 1970-03-23
BR6912563D0 (pt) 1973-04-10
GB1220766A (en) 1971-01-27
JPS5028912B1 (fr) 1975-09-19

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