US3572080A - Production of pointed workpieces - Google Patents

Production of pointed workpieces Download PDF

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Publication number
US3572080A
US3572080A US764875A US3572080DA US3572080A US 3572080 A US3572080 A US 3572080A US 764875 A US764875 A US 764875A US 3572080D A US3572080D A US 3572080DA US 3572080 A US3572080 A US 3572080A
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Prior art keywords
workpiece
die
crosshead
tube
dies
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US764875A
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English (en)
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Peter Alexoff
George A Mitchell
Fred E Halstead
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George A Mitchell Co
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George A Mitchell Co
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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
    • B21C5/00—Pointing; Push-pointing
    • B21C5/003—Pointing; Push-pointing of hollow material, e.g. tube
    • 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
    • B21C5/00—Pointing; Push-pointing

Definitions

  • Another pointing device used on heavy size tubes is the multiple hydraulic cylinder squeeze pointer that works on the point in steps, resulting in a very rough, long point.
  • the operation, even though universally accepted for larger sizes, is slow and requires high maintenance.
  • fold pointing is that in certain tube drawing operations where the tubes are immersed in a lubricant or cleaning acid, the closed end prevents or impedes drainage of lubricant from the interior of the tube. Also, where the tubing is to be drawn on a bull block, it is necessary to insert a floating mandrel into the tube prior to the pointing operation. if the floating mandrel happens to slide into the area of the tube to be pointed, a subsequent attempt to deform the end of the tube in a'press or hammer swaging machine will cause extensive damage to the pointing equipment.
  • Push-pointing has been used rather extensively on bars where the cross-sectional reduction per draw is quite low; however, until recently it has not been used on tubing primari ly because of the fact that the required outside diameter reduction on tubes is usually quite large and requires a rather heavy thrust to push the tube through the die. This would normally cause the tube to fail in compression before it could be pushed through the die.
  • Deformation of the tube during push-pointing can be eliminated by forming the tube gradually and in successive push-pointing operations. That is, the end of the tube is passed through a first die having a cross-sectional area less than the original crosssectional area of the workpiece, and thereafter passed through at least one other die having a cross'sectional area less than that of the first die whereby the cross-sectional area of the end of the tube is reduced in successive steps. Since the tubes are push-pointed in successive operations, the reduction taken in any successive step is not much as to cause failure in compression.
  • push-pointing apparatus for tubing employing successive dies required that the tube be aligned with a first die and pushed through that die, thereafter withdrawn from the first die, and then aligned with the second and succeeding dies where the foregoing cycle was repeated. As will be understood, this process is rather slow and cumbersome.
  • reduced diameter points are formed on the ends of long slender workpieces of predetermined cross-sectional area and particularly tubing, by the steps of initially clamping the workpiece in place, forcing a first die of cross-sectional area less than said predetermined cross-sectional area over the end of the workpiece to produce a reduced cross-sectional area end, and forcing at least one other die over said reduced cross-sectional area end while the first die remains stationary on the workpiece, the second and any succeeding dies having cross-sectional areas smaller than that of the preceding die whereby the cross-sectional area of the end of the workpiece is reduced in successive steps.
  • the present invention provides means whereby the end of the tube is extruded by successive dies into a point of increased wall thickness and greatly reduced cross-sectional area.
  • the tube is not completely closed such that lubricant, for example, can escape from the pointed end; and since the dies are pushed over the tube, no danger exists of damage to the pointing apparatus because of a floating-type mandrel being lodged in the section of the tube being pointed. That is, if the mandrel should be lodged in the area being pointed, it simply will be pushed backwardly as the dies are forced over the end of the tube.
  • high pressure hydraulic cylinders are utilized to force at least one die over the forward end of a workpiece. while a relatively low pressure air cylinder is utilized to urge a cup-shaped member over the forward end of the point as it is being formed by the die. In this manner, the pressure of the cup-shaped member against the end of the point prevents it from becoming bowed or curved.
  • the cup-shaped member and air cylinder force those dies following the die being pushed over the tube against the tube end to maintain it straight until the last die passes over the point, whereupon the cup-shaped member itself engages the end of the point.
  • FIG. I is a top or plan view of one embodiment of the tube pointing apparatus of the invention.
  • FIG. 2 is a cross-sectional view taken substantially along line II-II of FIG. I;
  • FIGS. 3A3D graphically illustrate the operation of the embodiment of FIGS. 1 and 2 in producing a pointed tube by successive push-pointing steps;
  • FIG. 4 is a top view of another embodiment of the invention'.
  • FIG. 5 is an end view of the embodiment of the invention shown in FIG. 4;
  • FIGS. 6A-6E illustrate the operation of the embodiment of FIGS. 4 and 5;
  • FIG. 7 is a cross-sectional view of still another embodiment of the invention employing a single crosshead having a plurality of rotary dies thereon;
  • FIG. 8 is a cross-sectional view taken substantially along line VIII-VIII of FIG. 7;
  • FIG. 9 is an end view taken substantially along line IXIX of FIG. 7.
  • the tube pointing apparatus shown includes a pair of side members 10 and I2 interconnected at one end by means of a mounting block I4 and at the other end by means of blocks 16 and I7 (FIG. 2)..Extending between the side members I0 and I2 is a channel member I8 which supports a circular bearing housing 20.
  • the bearing housing 20 at the ends of its inner peripheral surface. is provided with bushings 22 and 24 (FIG. 2) which receive the first cylinder of a set of three telescoping cylinders 26. 28 and 30.
  • the first or outer telescoping cylinder 36 slides within the bushings 22 and 24 and is connected, at its trailing end. to a crosshead 32.
  • the intermediate cylinder 28 is separated from cylinder 26 by means of bushings 34 and 36.
  • it is separated from the cylinder 30 by means of bushings 38 and 40.
  • the right end of cylinder 28. as viewed in FIG. 2. is connected to a second crosshead 42; while the central cylinder 30 is provided at its right end with a plug 44.
  • the cylinder 26 and its crosshead 32 are caused to reciprocate by means of a pair of hydraulic cylinders 46 and 48 (FIG. I) mounted on either side of the block 14 and having piston rods 46a and 48a passing through openings 50 in crosshead 42 and connected to the crosshead 32.
  • the cylinder 28 and its crosshead 42 can be caused to reciprocate by means of hydraulic cylinders 52 and 54 (FIG. 2) mounted at the top and bottom of the block 14 intermediate cylinders 46 and 48.
  • Cylinders 52 and 54 are provided with piston rods 52a and 54a which are connected to the crosshead 42.
  • the innermost cylinder 30 is reciprocated by means of a hydraulic cylinder 56 centrally mounted on the block 14 and having a piston rod 56a threaded to the plug 44 on the end of cylinder 30.
  • a hydraulic cylinder 56 centrally mounted on the block 14 and having a piston rod 56a threaded to the plug 44 on the end of cylinder 30.
  • enlarged diameter portions 58, 60 and 62. respectively. which receive push-pointing dies in a manner hereinafter described in connection with FIGS. 3A-3D.
  • the cylinders 46 and 48 are initially pressurized to force the crosshead 32 and the outer telescoping cylinder 26 to the left as viewed in FIG. 2. During this time. the piston rods 46a and 48a simply slide through the openings 50 in crosshead 42. Thereafter. cylinders 52 and 54 are pressurized to move crosshead 42 and the intermediate cylinder 28 to the left. Finally. the single cylinder 56 is pressurized to move the innermost cylinder 30 to the left. After a push-pointing operation. all of the cylinders 26. 28 and 30 are preferably moved to the right simultaneously.
  • a tube to be pointed is illustrated schematically in FIG. 2 and identified by the reference numeral 64.
  • This tube is clamped in position during a pointing operation by means of a pair of opposingjaws. generally indicated by the reference numerals 66 and 68.
  • the jaw 66 is stationarily mounted on the plates 16 and I7. Beneath the stationary jaw 66 is a block 72 which extends between plates 16 and I7. and extending between the block 72 and the upright portion of side member I2 are two traverse rods 74 and 76.
  • the rods 74 and 76 carry. for reciprocating movement. the jaw 68.
  • the jaw 68 In order to secure a tube to be pointed between the jaws 66 and 68. the jaw 68 is initially moved away from jaw 66 on rods 74 and 76; the tube inserted between the jaws; and jaw 68 then moved toward the jaw 66 in order to secure the tube in place.
  • Apparatus for reciprocating the jaw 68 on rods 74 and 76 includes a hydraulic cylinder 78 (FIG. I) having its one end pivotally connected at 80 to a bracket 82 secured to the upright portion of side member I2.
  • the piston rod 84 of cylinder 78 is pivotally connected at 86 to a bar 88.
  • the bar 88. in turn. is provided with two pins 90 and 92 which pivotally support sets of links 94. 96 and 98. I00.
  • the links 94 and 98 are pivotally connected to pins 102 and 104 carried on the jaw 68; while'the links 96 and are pivotally connected to pins 106 and 108 carried on a crossplate 110 which is. in turn. connected to plates 16 and I7.
  • FIGS. 3A3D the manner in which push-pointing occurs is shown.
  • the tube 64 to be pointed is clamped or secured between the jaws 66 and 68.
  • the tube 64 is to be drawn on a bull block. Accordingly. before the pointing operation begins. a floating mandrel I12 is inserted into the tube.
  • pins 114 and I16 embedded in the jaws 66 and 68 indent or dimple the tube 64 behind the floating mandrel I12. This insures that the mandrel becomes lodged between the interior of the tube and the die at the initiation of a bull block drawing operation. As soon as the drawing operation begins.
  • the dimpled portions formed by the pins 114 and 116 are pulled over the mandrel 112; however by this time the mandrel is securely lodged within the tube at the location of the drawing die.
  • the tube is to be drawn on a conventional drawbench where the mandrel is anchored at the end of a mandrel table opposite the drawing die. the dimples are unnecessary and the pins 114 and 116 may be removed from the aws.
  • a first die 118 Carried within the enlarged diameter portion 58 of the outer cylinder 26 is a first die 118. Similarly, a second die 120 is fitted into the enlarged diameter portion 60 of cylinder 28. Finally. the die I22 having a smaller diameter than that of the die 20 is fitted into the enlarged diameter portion 62 of the cylinder 30. An end cap 124 is threaded onto the end of the outer cylinder 26 to assist in preventing removal of the dies 118-422 from their seats upon removal of the dies from the pointed tube in a manner hereinafter described.
  • the pointing operation begins by pressurizing hydraulic cylinders 46 and 48 shown in FIG. I to thereby force the cylinder 26 and die 118 to the left as viewed in FIGS. 3A and 3B.
  • the cross-sectional area of its forward end is reduced such that it now has a diameter d2 which is smaller than the original diameter d1 of tube 64.
  • the forward end of the tube is ex traded such that its length is increased by an amount equal to [11.1. Following the first reduction process, therefore, the tube appears as in FIG. 3B.
  • the cylinders 52 and Mare now pressurized to move the cylinder 28 and die 60 to the left as viewed in FIG. 3C.
  • the die 121) has a diameter d3 which is smaller than the diameter d2 produced by the die I18. Again, the length of the tube is increased by extrusion in the amount A142. Finally, the single cylinder 56 is pressurized to force the die 122 over the end of the previously extruded tube as shown in FIG. 3D whereby the end of the point now assumes the diameter d4 and has increased in length in an amount equal to ALB At the completion of the pointing operation, hydraulic cylinders 46 and 48 are pressurized to withdraw all of the cylinders 26-30 and their associated dies 118122 to the right, whereupon the jaws 66 and 68 are opened to remove the now-pointed tube 64.
  • FIGS. 4 and 5 Apparatus for eliminating the curved condition of the point is shown, in one embodiment, in FIGS. 4 and 5. It again includes side members or channels 130 and 132 which support, at one end, a clamping mechanism 134 similar to the clamping mechanism already described in connection with FIGS. 1 and 2.
  • the clamping mechanism 1354 again includes a stationary clamping member 136, a movable clamping member 138, an actuating cylinder 140 and a linkage mechanism 142 interconnecting the cylinder and the movable clamping member 138 whereby the member 138 may be moved toward or away from a tube positioned between the two die members 136 and 138.
  • the clamping mechanism is the same as that shown in FIGS. 1 and 2.
  • a mounting block 144 At the other end of the channels 130 and 132 is a mounting block 144. Between the block 144 and upright channels 146 and 1148 supported on the side channels 130 and 132, respectively, are cylindrical slides or columns 150 and 152. Slideable on the columns 150 and 152 are three crossheads I54, 156 and 158. The crossheads 154-158 are perhaps best shown in FIG. 6A and carry dies 160, 162 and 1641, respectively. As will be explained hereinafter, the dies 160-164, have successively decreasing diameters as was the case with the embodiment of the invention shown in FIGS. 3A3D.
  • the crosshead 154 is connected through piston rods 166 to a first pair of hydraulic cylinders 161i and 170 (FIGS. 41 and 5) mounted at the top and bottom of the mounting block 1 14.
  • the crosshead b is connected through piston rods 172 (only one of which is shown in FIGS. bit-6D) to a second pair of hydraulic cylinders 1'74 and 176 also mounted on the mounting block 144.
  • crosshead 158 is connected through piston rods 178 to another pair of cylinders 1811 and 182 also mounted on the mounting block 144
  • a centrally located air cylinder 184 having a piston rod 1S6 (FIG. 6A) connected to a cup-shaped member 188 adapted to press against the back face of the third crosshead 15%.
  • FIG. 6A a tube '1" is shown clamped by the clamping mechanism, schematically illustrated at 134; while all of the crossheads 154, 15a and 158 are shown in their retracted positions with the cup-shaped member 188 in abutment with crosshead 158.
  • the air cylinder 184i is usually pressurized at all times, thereby applying a force against all of the crossheads 154-158.
  • the air cylinder cannot push them to the left, notwithstanding the fact that it is exerting a mild force thereon.
  • the reason for this can best be explained by the hydraulic schematic shown in FIG. 6E.
  • the cylinders 168 and 170 are connected to a pressure supply line 190 through a closedcenter valve 192 operated by means of solenoids I94 and 196.
  • a closed-center valve of this type and assuming that the valve is in the neutral position shown in FIG. 6E, oil is trapped on either side of the pistons within the cylinders 168 and 170. Hence, the pistons are locked in place as is the crosshead 154.
  • the cylinders I74 and 176, as well as cylinders 180 and 182. are controlled by means of open-center valves 198 controlled by means of solenoids 2110 and 202.
  • the opencenter valves I98 interconnect the chambers on opposite sides of the pistons in cylinders 174 and 176 or cylinders 180 and 182. Hence, as long as the valves 198 are in the neutral positions shown, the pistons and piston rods within cylinders 174, I76, I and 182 can move more or less freely.
  • a pointing operating begins by actuating valve 192 to pressurized cylinders 168 and 170 and move the crosshead 154 to the left as viewed in FIG. 63, thereby forcing the die over the end of the tube. This elon'gates the tube slightly and decreases its diameter, as was the case in FIGS. CIA-SD.
  • the cupshaped member 188 urges the crossheads I56 and 158 to the left also and into engagement with the end of the point being formed. That is, the die 162 on crosshead I56 engages the end of the tube and restrains it from moving offcenter by virtue of the more or less gentle pressure exerted by the air cylinder 1M.
  • the cylinders 174 and 176 are pressurized, thereby forcing crosshead I56 and its die 162 over the end of the tube T.
  • the cup-shaped member 188 and air cylinder 184 exert sufficient pressure on the crosshead 158 to cause its die 164 to again engage the end of the point and restrain it from moving offcenter.
  • the cylinders I81) and 182 are pressurized to force the crosshead 158 to the left whereby its die 164 is forced over the end of the point.
  • the cup-shaped member 188 now receives the end of the point and, again, by virtue of the pressure exerted by the air cylinder I84, rcstrains the end of the point from moving offcenter. Following this, cylinders I68 and are pressurized in the opposite direction to withdraw the dies from the end of the formed tube. This forces crossheads 156 and 158 backwardly also with the oil returning to a reservoir through open-center valves 198; while at the same time the cup-shaped member 188 and piston within air cylinder 184 are forced. backwardly by virtue of the higher pressure exerted by the hydraulic cylinders. when the crossheads are all back in their retracted positions shown in FIG.
  • the crosshead 154 locks them in position, even though pressure is exerted by the air cylinder 1S4, by virtue of the closed-center valve 192 as explained above.
  • the end of the point is at all times restrained in order that it cannot curve or bow during the extrusion process.
  • FIGS. 7, ti and 9 another embodiment of the invention is shown which does not employ multiple, concentric dies, but does employ an air cylinder for the purpose of preventing bowing in the extruded point.
  • It again includes side members or channels 204 and 206 which support, at one end, a clamp ing mechanism 203 and at the other end a mounting block 210.
  • Secured to the side members 204 and 206 are upright angles 212; and extending between the angles 212 and the mounting block 210 are columns or cylindrical guide rods 214 and 216 which carry, for reciprocating movement, a crosshead 218.
  • the crosshead 218, in turn, is connected through piston rods 220 and 222 to a pair of hydraulic cylinders 224 and 226, respectively.
  • Intermediate the cylinders 224 and 226 is an air cylinder 228 connected through piston rod 230 to a cup-shaped member 232, similar to the cup-shaped member 188 in the embodiment of FIGS. 4, and 6A-6E.
  • a rotary head or die holder 234 mounteded on the crosshead 218 is a rotary head or die holder 234.
  • the die holder 234 rotates about a central pin 236 which is threaded into the crosshead 218 Circumferentially spaced around the die holder 234 are slots 238, each slot 238 having a semicircular seat 240 to receive a die 244.
  • the dies 244, in turn, are held within the slots 238 by means of springloaded balls 242 which permit the circular dies to pass into their slots but keep them from falling out under the force of gravity.
  • the rotary die holder 234 may be provided with a handle 245 adapted to slidably fit into bores 246 spaced around the periphery of the die holder 234.
  • the centerline of a tube being pointed is concentric with the uppermost die shown in FIG. 8. That is, it lies in the same horizontal plane with the axes of the columns 216.
  • the operation of the pointer is similar to that described in connection with FIGS. 6A-6E in that the cup-shaped member 232, under the forceof air cylinder 228, prevents the end of the point from curving offeenter.
  • the embodiment of the invention shown in FIGS. 7 and 8 does not employ concentric dies.
  • a die is rotated into the uppermost position on the rotary head 234; that die is forced over the end of the tube; the die is retracted; and then the rotary head is rotated to the next, smaller die where the pointing operation can be repeated.
  • This type of pointer is particularly adapted for use in applications where only small reductions in the point need be taken as, for example, points used for a bull block operation.
  • the clamping mechanism 208 is provided with a pair of octagonal inserts 250 and 252 which fit into stationary and reciprocable clamp holding members 254 and 256, respectively, provided with seats which receive the inserts 250 and 252 (FIG. 9).
  • Each of the faces of the octagonal inserts 250 and 252 is provided with a semicylindrical channel 262 which, when mated with the corresponding channel in the other insert, forms a cavity 264 for reception of a tube to be clamped.
  • said means for yieldingly urging said member toward said crosshead comprises fluid cylinder means having a piston rod coaxial with said axis of the workpiece, said member being carried on the end of said piston rod and said conical surface being on the side of said member opposite the piston rod, and means for pressurizing said fluid cylinder to yieldingly urge said member toward said crosshead, the pressure exerted by said fluid cylinder being such that forward movement of the member with the crosshead will stop when the generally conical surface on the member engages said end surface of the workpiece.
  • said means for clamping the workpiece in place comprises a first cradle, a second cradle movable toward and away from the first cradle, clamping members carried in the cradles, each of the clamping members having a plurality of sides, and semicircular channels of different diameters formed in said dies and extending parallel to the axis of an article to be clamped.
  • each channel in one member being of the same diameter as a corresponding channel in the other member whereby the members can be rotated to place the same sized channels in juxtaposition for reception of a workpiece to be clamped.
  • the apparatus of claim 1 including a plurality of crossheads each of which carries an associated die, the dies on successive crossheads being of successively smaller diameters and coaxial with the axis of said workpiece, means for forcing the crosshead carrying the die of largest diameter along the axis of said workpiece whereby the die of largest diameter will pass over the end of said workpiece, means for forcing at least a second crosshead carrying a die of smaller diameter along the axis of said workpiece whereby said die of smaller diameter will pass over the reduced cross-sectional area formed by said largest diameter die while the first-mentioned die remains on the workpiece, said generally conical surface on said member engaging said end surface of the workpiece after said die of smaller diameter has passed thereover.
  • the apparatus of claim 1 including hydraulic cylinder means for forcing said crosshead and the die carried thereby toward said workpiece, and wherein said means for yieldingly urging said member toward said crosshead comprises a pneumatic cylinder which exerts a force less than the force exerted by said hydraulic cylinder means.
  • crosshead carries a plurality of dies of successively smaller diameters, and means on said crosshead for moving successive ones of said dies into alignment with the axis of said workpiece.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Shaping Metal By Deep-Drawing, Or The Like (AREA)
  • Treatment Of Fiber Materials (AREA)
  • Forging (AREA)
US764875A 1968-10-03 1968-10-03 Production of pointed workpieces Expired - Lifetime US3572080A (en)

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FR (1) FR2019866A1 (cg-RX-API-DMAC7.html)
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Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3845653A (en) * 1971-03-22 1974-11-05 Continental Can Co Double stage necking
US3950978A (en) * 1974-01-09 1976-04-20 Mannesmannrohren-Werke Ag Stretch-forming of long tubes
US6212929B1 (en) * 1997-08-16 2001-04-10 Fritz Binhack Device and method for forming, in particular cold-forming, workpieces
US6735998B2 (en) 2002-10-04 2004-05-18 George A. Mitchell Company Method of making metal ball bats
US6779375B1 (en) 2003-03-26 2004-08-24 Randall L. Alexoff Method and apparatus for producing tubes and hollow shafts
US20040200255A1 (en) * 2001-04-04 2004-10-14 Colin Newport Method of manufacturing structural components from tube blanks of variable wall thickness
US6807837B1 (en) 2003-03-26 2004-10-26 Randall L. Alexoff Method and apparatus for producing variable wall thickness tubes and hollow shafts
US20050210950A1 (en) * 2004-03-27 2005-09-29 Mitchell George A Method of making metal workpiece
US20090188292A1 (en) * 2006-08-07 2009-07-30 Felss Gmbh Device and method for forming a workpiece
CN102878355A (zh) * 2012-10-24 2013-01-16 珠海格力电器股份有限公司 一种空调系统变径管路件
CN106607516A (zh) * 2015-10-26 2017-05-03 镇江中焱数控设备有限公司 管端成型机
US20180021826A1 (en) * 2016-07-22 2018-01-25 Sms Group Gmbh Preparing a tube end for rod drawing

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0021603B1 (en) * 1979-06-08 1984-02-01 STEVENS & BULLIVANT LIMITED Tube end forming apparatus
DE19634307C2 (de) * 1996-08-24 1998-09-24 Bueltmann Monika Hydraulische Anlage zur Bildung einer Rohrziehangel

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FR774985A (fr) * 1933-08-18 1934-12-17 Maschb Ag Vormals Ehrhardt & S Procédé d'étirage à refoulement pour la fabrication de tubes ou corps creux
US2110965A (en) * 1934-07-02 1938-03-15 Tubus A G Reducing the diameter of hollow metal articles
DE730633C (de) * 1938-10-19 1943-01-15 Ernst Heinkel Flugzeugwerke G Hydraulische Rohreinziehpresse
FR942599A (fr) * 1946-01-11 1949-02-11 Wellman Seaver Rolling Mill Co Perfectionnement au procédé de fabrication des tubes métalliques
GB843186A (en) * 1956-01-12 1960-08-04 Appel Process Ltd Improvements in or relating to the forging or swaging of elongated workpieces
US3035340A (en) * 1958-04-25 1962-05-22 Appel Process Ltd Methods for relieving stresses in and straightening tubular workpieces

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR774985A (fr) * 1933-08-18 1934-12-17 Maschb Ag Vormals Ehrhardt & S Procédé d'étirage à refoulement pour la fabrication de tubes ou corps creux
US2110965A (en) * 1934-07-02 1938-03-15 Tubus A G Reducing the diameter of hollow metal articles
DE730633C (de) * 1938-10-19 1943-01-15 Ernst Heinkel Flugzeugwerke G Hydraulische Rohreinziehpresse
FR942599A (fr) * 1946-01-11 1949-02-11 Wellman Seaver Rolling Mill Co Perfectionnement au procédé de fabrication des tubes métalliques
GB843186A (en) * 1956-01-12 1960-08-04 Appel Process Ltd Improvements in or relating to the forging or swaging of elongated workpieces
US3035340A (en) * 1958-04-25 1962-05-22 Appel Process Ltd Methods for relieving stresses in and straightening tubular workpieces

Cited By (16)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3845653A (en) * 1971-03-22 1974-11-05 Continental Can Co Double stage necking
US3950978A (en) * 1974-01-09 1976-04-20 Mannesmannrohren-Werke Ag Stretch-forming of long tubes
US6212929B1 (en) * 1997-08-16 2001-04-10 Fritz Binhack Device and method for forming, in particular cold-forming, workpieces
US20040200255A1 (en) * 2001-04-04 2004-10-14 Colin Newport Method of manufacturing structural components from tube blanks of variable wall thickness
US8141404B2 (en) 2001-04-04 2012-03-27 Arcelormittal Tubular Products Canada Inc. Method of manufacturing structural components from tube blanks of variable wall thickness
US6735998B2 (en) 2002-10-04 2004-05-18 George A. Mitchell Company Method of making metal ball bats
US6779375B1 (en) 2003-03-26 2004-08-24 Randall L. Alexoff Method and apparatus for producing tubes and hollow shafts
US6807837B1 (en) 2003-03-26 2004-10-26 Randall L. Alexoff Method and apparatus for producing variable wall thickness tubes and hollow shafts
US7114362B2 (en) * 2004-03-27 2006-10-03 George A. Mitchell Company Method of making metal workpiece
US20050210950A1 (en) * 2004-03-27 2005-09-29 Mitchell George A Method of making metal workpiece
US20090188292A1 (en) * 2006-08-07 2009-07-30 Felss Gmbh Device and method for forming a workpiece
US8091400B2 (en) * 2006-08-07 2012-01-10 Felss Gmbh Device and method for forming a workpiece
CN102878355A (zh) * 2012-10-24 2013-01-16 珠海格力电器股份有限公司 一种空调系统变径管路件
CN106607516A (zh) * 2015-10-26 2017-05-03 镇江中焱数控设备有限公司 管端成型机
US20180021826A1 (en) * 2016-07-22 2018-01-25 Sms Group Gmbh Preparing a tube end for rod drawing
US10639690B2 (en) * 2016-07-22 2020-05-05 Sms Group Gmbh Preparing a tube end for rod drawing

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FR2019866A1 (cg-RX-API-DMAC7.html) 1970-07-10
GB1266951A (cg-RX-API-DMAC7.html) 1972-03-15
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DE1949272A1 (de) 1970-06-04

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