US20080314113A1 - Processing method of tube body, manufacturing method of cylinder device and cylinder device manufactured by the same - Google Patents

Processing method of tube body, manufacturing method of cylinder device and cylinder device manufactured by the same Download PDF

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Publication number
US20080314113A1
US20080314113A1 US12/078,228 US7822808A US2008314113A1 US 20080314113 A1 US20080314113 A1 US 20080314113A1 US 7822808 A US7822808 A US 7822808A US 2008314113 A1 US2008314113 A1 US 2008314113A1
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US
United States
Prior art keywords
base tube
end portion
cylinder
tube
processing method
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.)
Abandoned
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US12/078,228
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English (en)
Inventor
Kazunori Minoguchi
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.)
Hitachi Ltd
Original Assignee
Hitachi Ltd
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Filing date
Publication date
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Assigned to HITACHI, LTD. reassignment HITACHI, LTD. ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: MINOGUCHI, KAZUNORI
Publication of US20080314113A1 publication Critical patent/US20080314113A1/en
Priority to US13/305,430 priority Critical patent/US20120131797A1/en
Abandoned legal-status Critical Current

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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
    • F16F9/00—Springs, vibration-dampers, shock-absorbers, or similarly-constructed movement-dampers using a fluid or the equivalent as damping medium
    • F16F9/32—Details
    • F16F9/3207—Constructional features
    • F16F9/3235—Constructional features of cylinders
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D22/00—Shaping without cutting, by stamping, spinning, or deep-drawing
    • B21D22/14—Spinning
    • B21D22/16—Spinning over shaping mandrels or formers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D41/00—Application of procedures in order to alter the diameter of tube ends
    • B21D41/02—Enlarging
    • B21D41/021—Enlarging by means of tube-flaring hand tools
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B15/00—Fluid-actuated devices for displacing a member from one position to another; Gearing associated therewith
    • F15B15/08—Characterised by the construction of the motor unit
    • F15B15/14—Characterised by the construction of the motor unit of the straight-cylinder type
    • F15B15/1423—Component parts; Constructional details
    • F15B15/1438—Cylinder to end cap assemblies
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T29/00—Metal working
    • Y10T29/49—Method of mechanical manufacture
    • Y10T29/494—Fluidic or fluid actuated device making

Definitions

  • the present invention relates to a processing method of a tube body wherein thickness of an end portion of the tube body is reduced by plastic working so as to finish in a predetermined dimension, a manufacturing method of a cylinder device using the processing method, and the cylinder device manufactured by the same.
  • an inner cylinder 1 slidably housing a piston 8 is introduced into an outer cylinder 2 with a base.
  • One end of a piston rod 3 opposite to the other end connected to the piston 8 , is inserted into a rod guide 4 and an oil seal 5 both installed in an open end of the inner cylinder 1 and the outer cylinder 2 so as to extend outside.
  • damping force will be generated by flow resistance of hydraulic fluid flowing through a piston valve PV and a bottom valve BV.
  • inflow and out flow of the hydraulic fluid according to compression and extension of the piston rod 3 can be compensated by a reservoir 6 provided between the inner cylinder 1 and the outer cylinder 2 .
  • the rod guide 4 and the oil seal 5 are fitted into the open end of the outer cylinder 2 and prevented from falling off with a bended segment 2 a which is an end portion of the outer cylinder 2 being bended inside in a radial direction.
  • a cap 7 for receiving a bump stopper 9 is installed at the end portion of the outer cylinder 2 in such a condition that the cap 7 is pressed-in to the outer periphery of the outer cylinder 2 .
  • the cap 7 is provided with a plurality of (for example, three) projections 7 a on the inner bottom side thereof so as to fix in an axial direction by abutting the projections 7 a to the bended segment 2 a.
  • the end portion of the outer cylinder 2 described hereinabove its internal diameter side is applicable as a fitting portion of the rod guide 4 and the oil seal 5 while its external diameter side is applicable as a press-fitting portion of the cap 7 . Accordingly, not only dimensions of those internal and external diameters, but also concentricity, circularity, etc. of the end portion of the outer cylinder 2 should be highly precise. Further, in order not to damage the oil seal 5 in assembly, it is required for the inner surface of the end portion of the outer cylinder 2 to maintain well-conditioned surface roughness. Still further, to smoothly perform bending of the bended segment 2 a , it is desirable that thickness of the end portion of the outer cylinder 2 is as thin as possible. Especially, in case of a hydraulic damper for a strut suspension, thickness of the outer cylinder 2 will be relatively large, whereby it is required to make the end portion of the outer cylinder 2 thinner.
  • the external diameter of the outer cylinder 2 is used as the press-fitting portion of the cap 7 thereby being necessary to retain a predetermined dimension for the external diameter. Accordingly, as regards the hydraulic damper for the strut suspension, the end portion of the outer cylinder 2 is made to be thin normally by cutting the inner surface of the end portion of the outer cylinder 2 to form a multi-stepped portion. Specifically, as shown in FIG.
  • first diameter expanding portion 2 A the internal diameter of which is slightly larger than a general portion (not the end portion including the first diameter expanding portion 2 A and a second diameter expanding portion 2 B); and a second diameter expanding portion 2 B, the internal diameter of which is slightly larger than the first diameter expanding portion 2 A.
  • the first diameter expanding portion 2 A is used as a fitting portion of the rod guide 4
  • the second diameter expanding portion 2 B is used as a fitting portion of the oil seal 5 .
  • US Patent Application Publication 2005/0011245 A1 (hereinafter reference 1), a counterpart application of Japanese Patent Application Unexamined Publication No. 2003-225725, discloses the following processing method: a mandrel is inserted into a base tube; and an end portion of the base tube is attached to the mandrel by performing a parallel swaging work with a die. With this method, the end portion of the base tube is processed with ironing through the parallel swaging work by squeezing thereof between the mandrel and the die. Accordingly, it is possible to make the end portion of the outer cylinder 2 to be thin formation while maintaining precise dimension and well surface roughness.
  • the ironing is performed while squeezing the end portion of the base tube, the external diameter of the end portion of the outer cylinder 2 will be narrowed, whereby a design change may be required for sheathing parts such as the cap 7 to be pressed in or sheathing the end portion of the outer cylinder 2 .
  • the present invention has been made in light of the above problem, and it is an object of the present invention to provide a processing method of a tube body, a manufacturing method of a cylinder device and the cylinder device thereof being able to process an end portion of the tube body in a high degree of accuracy without depending on cutting work which generates chips or burrs when processing an inner periphery of the tube body.
  • a processing method of a tube body comprising the steps of: a tube-expanding step wherein a base tube is partially retained with a chuck unit having a rotational function, and a mandrel is pressed in to an end portion of the base tube so as to expand the end portion of the base tube; and a rotation ironing step wherein the chuck unit rotates the base tube together with the mandrel, a roller die is pressed against an outer-periphery surface of the end portion of the base tube and the roller die is moved with respect to the base tube and in an axial direction thereof so as to deform an inner-periphery surface of the end portion of the base tube into a shape corresponding to an external shape of the mandrel.
  • a manufacturing method of a cylinder device comprising the steps of: a manufacturing step of manufacturing a cylinder by the processing method of a tube body according to claim 1 ; an assembling step of assembling interior parts including a piston, a piston rod and a rod guide into the cylinder; and a curling process of curling a tip end portion of the cylinder so as to prevent the interior parts from falling off.
  • a cylinder device comprising: a cylinder; a rod adapted to be compressed into or extended from one end of the cylinder; a rod guide inserted into the one end of the cylinder so as to support the rod; and a curled portion formed by curling a tip end portion of the cylinder so as to prevent the rod guide from falling off from the cylinder, wherein the cylinder is formed by pressing a mandrel into an end portion of a base tube, and pressing a roller die against the base tube so as to deform an inner-periphery surface of the end portion of the base tube along an outer-periphery surface of the mandrel.
  • a cylinder device comprising: a rod adapted to be compressed into or extended from one end of the cylinder; a rod guide inserted into the one end of the cylinder so as to support the rod; and a curled portion formed by curling a tip end portion of the cylinder so as to prevent the rod guide from falling off from the cylinder, wherein a thickness reduction rate of the one end of the cylinder is 50% or less.
  • FIG. 1A , FIG. 1B and FIG. 1C are cross-sectional views sequentially showing a processing method of a tube body according to a first embodiment of the present invention, wherein: FIG. 1A shows a retaining process in which to retain a base tube at a chuck unit; FIG. 1B shows a tube-expanding process in which to press a mandrel into an end portion of the base tube; and FIG. 1C shows an initial stage of a rotation ironing process;
  • FIG. 2D , FIG. 2E and FIG. 2F are cross-sectional views of processing steps following FIG. 1C : FIG. 2D shows an initial stage of the rotation ironing process; FIG. 2E shows a final stage of the rotation ironing process; and FIG. 2F shows a final stage of the whole steps;
  • FIG. 3 is a side view showing a formation of the mandrel according to the present invention.
  • FIG. 4 is a cross-sectional view showing a formation of a tube after finishing work according to the present invention.
  • FIG. 5 is a cross-sectional view showing an assembling process of a cylinder device according to the present invention.
  • FIG. 6 is a cross sectional view showing the rotation ironing process in a modified example according to the first embodiment of the present invention.
  • FIG. 7 is a local cross-sectional view of the base tube in a modified example according to the first embodiment of the present invention.
  • FIG. 8 is a side view showing a formation of the mandrel according to a second embodiment of the present invention.
  • FIG. 9 C′ and FIG. 9 E′ are cross-sectional views sequentially showing a processing method of the tube body according to the second embodiment of the present invention, wherein: FIG. 9 C′ shows an initial stage of a rotation ironing process; and FIG. 9 E′ shows a final stage of the rotation ironing process;
  • FIG. 10G and FIG. 10H are cross-sectional views sequentially showing a processing method of the tube body according to the second embodiment of the present invention, wherein FIG. 10G shows an initial stage in which the mandrel is pulled out after completing the rotation ironing process and the end of the tube body is to be cut (end cutting process); and FIG. 10H shows a stage immediately after the end cutting process;
  • FIG. 11 is a cross-sectional view showing the whole structure of a hydraulic damper provided with an external cylinder subject to work of the present invention.
  • FIG. 12 is a cross-sectional view showing a local structure of the hydraulic damper of FIG. 11 .
  • FIGS. 1 to 3 show a processing method of a tube body in sequence according to a first embodiment of the present invention.
  • the first embodiment of the present invention is to finish an end portion of an outer cylinder 2 (tube body) of a hydraulic damper as shown in FIGS. 11 and 12 to be thin and in a predetermined dimension by plastic working.
  • a first diameter expanding portion 2 A functioning as a fixing portion of a rod guide 4 and a second diameter expanding portion 2 B functioning as a fixing portion of a oil seal 5 are formed in continuity.
  • a taper surface 2 C in a chamfer formation is formed at an inner edge of an opening end of the outer cylinder 2 .
  • An inner diameter dA of the first diameter expanding portion 2 A is made to be slightly larger than an inner diameter d 0 of the other portion (hereinafter general portion) while an inner diameter dB of the second diameter expanding portion 2 B is set slightly larger than the inner diameter dA of the first diameter expanding portion 2 A.
  • an external diameter of the end portion of the outer cylinder 2 is made to be the same with an external diameter of the general portion, whereby thickness of the first diameter expanding portion 2 A is made to be thinner than thickness of the general portion while thickness of the second diameter expanding portion 2 B is made to be thinner than the thickness of the first diameter expanding portion 2 A.
  • a kind of the base tube 10 can be optionally chosen; the based tube 10 may be a seamless tube or a welded tube.
  • an electroseamed tube is applied as the welded tube, caution should be given.
  • An outer periphery surface of the electroseamed tube is smooth, but the inner periphery surface thereof has weld beads such as convex beads or concave beads thereon.
  • the mandrel 11 is provided with, as well shown in FIG. 3 , a minimum diameter portion 12 placed at the most tip thereof and a maximum diameter portion 13 placed at the most base thereof opposite to the minimum diameter portion 12 . Between the minimum diameter portion 12 and the maximum diameter portion 13 , the following forming portions are provided in continuity: a first forming portion 14 having the same diameter of the inner diameter dA of the first diameter expanding portion 2 A; a second forming portion 15 having the same diameter of the inner diameter dB of the second diameter expanding portion 2 B; and a taper formation 16 having the same formation with the taper surface 2 C.
  • the minimum diameter portion 12 of the mandrel 11 has an external diameter slightly smaller than the inner diameter of the base tube 10 while the maximum diameter portion 13 has an external diameter approximately the same with an external diameter of the base tube 10 . Further, between the taper formation 16 and the maximum diameter portion 13 , an abutting portion 13 A, to which the end portion of the base tube 10 is abutted when the mandrel 11 is pressed into the base tube 10 , is provided.
  • FIG. 1A a base portion of the base tube 10 is to be supported by a chuck 21 of a chuck unit 20 provided within a rotation ironing process apparatus while the mandrel 11 is to be supported by a pressurized device (not shown) shiftable relative to the chuck unit 20 .
  • the rotation ironing process apparatus is provided with a pair of roller dies 22 / 22 , each of the roller dies 22 / 22 is rotatable and placed to face each other with the base tube 10 retained by the chuck 21 between.
  • the pair of roller dies 22 / 22 is supported by a driving device (not shown), so that each of the pair of roller dies 22 / 22 can come closer toward or away from each other. Further, the roller dies 22 / 22 are shiftable in parallel along the base tube 10 .
  • This roller dies 22 / 22 are not directly provided with a driving apparatus but is rotated by rotation of the base tube 10 , that is, by friction between the roller dies 22 / 22 and the base tube 10 .
  • the mandrel 11 is pressed into a tip end portion (the most end portion where mandrel 11 is inserted) of the base tube 10 retained by the chuck 21 .
  • the press-in of the mandrel 11 should be performed in consideration that the base tube 10 will be extended following a rotation ironing process; a certain clearance should be thus provided between the abutting portion 13 A of the maximum diameter portion 13 and the tip end portion of the base tube 10 .
  • the inner surface of the end portion of the base tube 10 is to be expanded so as to make a stepped formation by means of the first and second forming portion 14 / 15 of the mandrel 11 (hereinafter the end portion means the portion where the stepped formation is formed).
  • This process shown in FIG. 1B will be regarding as a tube-expanding process of the present invention.
  • the chuck unit 20 will rotate the base tube 10 in a predetermined speed, and then, as shown in FIG. 2D , the pair of roller dies 22 / 22 is each shifted toward each other. The roller dies 22 / 22 then abut to a portion adjacent to the end portion of the base tube 10 . Through this abutment, each of the roller dies 22 / 22 will roll over the outer periphery of the base tube 10 rotated. Next, as shown in FIG. 2E , the pair of the roller dies 22 / 22 are shifted in parallel toward the tip end portion of the base tube 10 .
  • Ironing will be thus performed over the end portion of the base tube 10 by the pair of the roller dies 22 / 22 in collaboration with the mandrel 11 .
  • the outer periphery of the end portion of the base tube 10 evenly flattens to be equal to the outer periphery of the general portion of the base tube 10 , whereby thickness of the end portion of the base tube 10 can be also reduced at the same time.
  • the inner surface of the end portion of the base tube 10 is finished to have a multistage formation according to the nose portion of the mandrel 11 having the stepped formation hereinbefore described.
  • the pair of roller dies 22 / 22 will stop its shift when reaching to the maximum diameter portion 13 of the mandrel 11 , and then, as shown in FIG. 2F , the mandrel 11 is pulled out from the base tube 10 while the pair of the roller dies 22 / 22 are shifted so as to be detached from each other.
  • the sequential work over the end portion of the base tube 10 is here completed.
  • the outer cylinder 2 finished through the above process has its inner surface of the end portion, as shown in FIG. 4 , with the desired stepped formation sequentially provided with the first diameter expanding portion 2 A, the second diameter expanding portion 2 B and the tape surface 2 C.
  • the inner roughness of the processed end portion of the outer cylinder 2 will be also in a good condition. Accordingly, the rod guide 4 and the oil seal 5 can be smoothly fitted into the end portion of the outer cylinder 2 .
  • the inner cylinder 1 sub-assembled with the bottom valve BV is inserted into the outer cylinder 2 , and then the piston rod 3 installed with the piston 8 and the piston valve PV is inserted into the inner cylinder 1 .
  • the rod guide 4 sub-assembled with all kinds of seals or a guide bushing is inserted into the piston rod 3 so as to fit the rod guide 4 to the piston rod 3 .
  • the oil seal 5 is also inserted. If necessary, oil or gas can be enclosed.
  • the outer cylinder 2 is rotated so as to perform a full-curling process.
  • another processes can be applied such as: an oscillating curl process producing a full-curling by rotating inclined dies and abutting the dies over the end surface of the outer cylinder 2 ; or a process producing partial curling portions by partially caulking the outer cylinder 2 , may be 4 portions, in a circumferential direction. That is, as long as the parts such as the rod guide 4 are not pulled out from the outer cylinder 2 , any methods (curling the tip end portion of the outer cylinder 2 inside) can be applied.
  • thickness of the second diameter expanding portion 2 B is considerably reduced whereby the second diameter expanding portion 2 B is hardened due to advancement of a structural denseness; however, it does not affect facilitation of the curling process.
  • advancement of the structural denseness hereinabove described is prominent; however, by performing the above-described oscillating curl process in a full circumference, the full-curling can be performed in such a manner as to squash the structurally dense portions (hardened portions) in an axial direction. Accordingly, bending of the bended segment 2 a ( FIG. 12 ) can be easily and smoothly performed.
  • a tube having thickness approximately between 2.5 mm to 3.5 mm In general vehicle shock absorbers (cylinder devices), it is usual to use a tube having thickness approximately between 2.5 mm to 3.5 mm. Considering such a tube, and supposing a thickness reduction rate of a cylinder as more than 30%, it is still possible to obtain the high strength tube without cracks with the oscillating curl process in a full circumference. Further, necessary removing force of a sealing means including rod guides or seals in a vehicle shock absorber is 25 kN in general. In the above case of the oscillating curl process, the removing force more than 25 kN can be obtained.
  • the first diameter expanding portion 2 A functioning as the fitting portion of the rod guide 4 is secured with enough thickness, whereby strength deterioration thereof is limited, and there is no problem for strength with respect to the outer cylinder 2 .
  • the external diameter of the outer cylinder 2 is finished to have a evenly flat surface with the outer periphery of the general portion of the base tube 10 , the cap 7 conventionally applied can be used as it is. See FIG. 12 .
  • welded tubes can be applied as the base tube 10 with no qualitative negative impact. Accordingly, those welded tubes at less price can be used, contributing to the reduction of manufacturing cost.
  • the mandrel 11 with two steps made by the first forming portion 14 and the second forming portion 15 having different diameters was applied, but the number of the steps provided at the nose of the mandrel 11 is optional. If desired for thinner tubes, only one step may be applied, or if desired for more thick tube, three steps or more can be applied.
  • the pair of the roller dies 22 / 22 facing toward each other is used for the rotation ironing process; however, the number of the roller die 22 to be provided is also optional.
  • Three roller dies 22 may be applied. Here, in case three roller dies 22 or more are applied, those roller dies 22 should be evenly arranged around the base tube 10 .
  • the present invention is applicable with a planetary ball die instead of the roller die.
  • the roller dies 22 / 22 are shifted along the base tube; however, the present invention is not limited thereto. Instead, the base tube itself may be shifted without shifting the roller dies 22 / 22 in an axial direction.
  • the roller dies 22 / 22 may be shifted in the axial and radial directions along the mandrel 11 , enabling to decrease a reduction rate of tube thickness. By adjusting the shifting amount in a radial direction, the reduction rate of the tube thickness can be controlled.
  • a tool bit 23 (hereinafter described in details) as shown in FIG. 10 can be shifted in an axial direction along the base tube 10 .
  • the reduction rate of the tube thickness can be also modified by a method shown in FIG. 7 . That is, the outer periphery of an end portion 40 of the outer cylinder 2 (tube body) is cut in advance so as to reduce the outer diameter of the outer cylinder 2 (diameter reduction process). and then the same process in the first embodiment is applied.
  • FIGS. 8 to 10 a processing method of a tube body in a second embodiment will be described with reference to FIGS. 8 to 10 .
  • the same components as those in the first embodiment are designated by the same reference numerals, and explanations thereto will be omitted.
  • the taper formation 16 and the abutting portion 13 A in the first embodiment are modified to be a diameter expanding portion 16 A connecting the taper formation 16 and the abutting portion 13 A with a smooth inclined surface.
  • the base portion of the base tube 10 is to be supported by the chuck 21 of the chuck unit 20 provided within the rotation ironing process apparatus while the mandrel 11 is to be supported by a pressurized device (not shown) shiftable relative to the chuck unit 20 .
  • This FIG. 1A is thus the retaining process in the present invention.
  • the rotation ironing process apparatus is provided with the pair of roller dies 22 / 22 , each of the roller dies 22 / 22 is rotatable and placed to face each other with the base tube 10 retained by the chuck 21 between.
  • the pair of roller dies 22 / 22 is supported by the driving device (not shown), so that each of the pair of roller dies 22 / 22 can come closer toward or away from each other. Further, the roller dies 22 / 22 are shiftable in parallel along the base tube 10 . those roller dies 22 / 22 are not directly provided with a driving apparatus but rotated by rotation of the base tube 10 , that is, by friction between the roller dies 22 / 22 and the base tube 10 . Here, it is optional to provide the driving apparatus directly to the roller dies 22 / 22 so as to rotate the roller dies 22 / 22 by their own.
  • the mandrel 11 is pressed into the tip end portion of the base tube 10 retained by the chuck 21 .
  • the press-in of the mandrel 11 is performed until the end portion of the base tube 10 is abutted to the diameter expanding portion 16 A (abutting portion 13 A) Accordingly, the inner surface of the end portion of the base tube 10 is to be expanded into a stepped formation by the first and second forming portions 14 / 15 of the mandrel 11 (tube-expanding process).
  • the base tube 10 will be rotated through operation of the chuck unit 20 at a predetermined speed.
  • the pair of roller dies 22 / 22 is each shifted toward each other and then abut to a portion adjacent to the end portion of the base tube 10 .
  • each of the roller dies 22 / 22 will roll over the outer periphery of the base tube 10 rotated and shift in parallel toward the tip end portion of the base tube 10 . See FIG. 9 E′. Ironing will be thus performed over the end portion of the base tube 10 by the pair of the roller dies 22 / 22 in collaboration with the mandrel 11 .
  • the outer periphery of the end portion of the base tube 10 evenly flattens to be equal to the outer periphery of the general portion of the base tube 10 , whereby thickness of the end portion of the base tube 10 can be also reduced at the same time.
  • the inner surface of the end portion of the base tube 10 is finished to have a multistage formation according to the nose portion of the mandrel 11 having the stepped formation.
  • the tool bit 23 is abutted to the base tube 10 from a radially outward direction so as to cut the thin padding portion 24 (end cutting process).
  • a desired stepped portion wherein the inner end surface of the base tube 10 has the first diameter expanding portion 2 A, the second diameter expanding portion 2 B and the taper surface 2 C formed in continuity, is finished.
  • the rest of the procedure is the same with the first embodiment.
US12/078,228 2007-03-30 2008-03-28 Processing method of tube body, manufacturing method of cylinder device and cylinder device manufactured by the same Abandoned US20080314113A1 (en)

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US13/305,430 US20120131797A1 (en) 2007-03-30 2011-11-28 Processing Method of Tube Body, Manufacturing Method of Cylinder Device and Cylinder Device Manufactured By the Same

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JP2007-94307 2007-03-30
JP2007094307 2007-03-30
JP2008038918A JP5435190B2 (ja) 2007-03-30 2008-02-20 管体の加工方法及びシリンダ装置の製造方法
JP2008-38918 2008-02-20

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US20120285215A1 (en) * 2010-01-12 2012-11-15 Repkon Machine and Tool Industry and Trade Inc. Device and method to shape worked pieces
EP2711103A1 (de) * 2012-09-22 2014-03-26 Repkon Machine and Tool Industry and Trade Inc. Verfahren und Vorrichtung zum Fliessdrücken von Werkstücken
WO2015117787A1 (de) * 2014-02-06 2015-08-13 Zf Friedrichshafen Ag Verfahren und vorrichtung zur herstellung eines verschlusses für ein kolbenzylinder-aggregat
DE102014223480A1 (de) * 2014-11-18 2016-05-19 Zf Friedrichshafen Ag Verfahren zur Herstellung eines hydraulischen Endanschlags eines Schwingungsdämpfers und Folgeverbundwerkzeug
EP3025802A1 (de) * 2014-11-28 2016-06-01 Repkon Machine and Tool Industry and Trade Inc. Vorrichtung und Verfahren zum Drückwalzen von Werkstücken
EP3106240A1 (en) * 2015-06-15 2016-12-21 Fundacíon Tecnalia Research & Innovation Rotary extrusion machine
US9821358B2 (en) 2013-12-12 2017-11-21 Calsonic Kansei Corporation Method and apparatus for forming elliptical hollow cylinder
US20190022728A1 (en) * 2016-01-14 2019-01-24 Topy Kogyo Kabushiki Kaisha Spinning apparatus and spinning method
CN112872208A (zh) * 2020-12-29 2021-06-01 广州奇典皮件有限公司 一种用于钢材生产过程中的端口扩径装置及其扩径方法
US11131330B1 (en) * 2020-03-30 2021-09-28 Caterpillar Inc. Crimp retained hydraulic cylinder head and cap
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