WO2018062176A1 - Procédé de fabrication de dispositif du type cylindre - Google Patents

Procédé de fabrication de dispositif du type cylindre Download PDF

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Publication number
WO2018062176A1
WO2018062176A1 PCT/JP2017/034732 JP2017034732W WO2018062176A1 WO 2018062176 A1 WO2018062176 A1 WO 2018062176A1 JP 2017034732 W JP2017034732 W JP 2017034732W WO 2018062176 A1 WO2018062176 A1 WO 2018062176A1
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WO
WIPO (PCT)
Prior art keywords
molded body
intermediate molded
cylinder
side wall
mandrel
Prior art date
Application number
PCT/JP2017/034732
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English (en)
Japanese (ja)
Inventor
雄治 中山
良介 構
繁 岩田
誠治 深山
Original Assignee
日立オートモティブシステムズ株式会社
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by 日立オートモティブシステムズ株式会社 filed Critical 日立オートモティブシステムズ株式会社
Publication of WO2018062176A1 publication Critical patent/WO2018062176A1/fr

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    • 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
    • B21H—MAKING PARTICULAR METAL OBJECTS BY ROLLING, e.g. SCREWS, WHEELS, RINGS, BARRELS, BALLS
    • B21H1/00—Making articles shaped as bodies of revolution
    • B21H1/18—Making articles shaped as bodies of revolution cylinders, e.g. rolled transversely cross-rolling
    • 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

Definitions

  • the present invention relates to a method for manufacturing a cylinder device.
  • This application claims priority based on Japanese Patent Application No. 2016-188039 filed in Japan on September 27, 2016, the contents of which are incorporated herein by reference.
  • an object of the present invention is to provide a method of manufacturing a cylinder device that can suppress a reduction in machining accuracy.
  • a method of manufacturing a cylinder device includes a cylinder, a first end side connected to a piston in the cylinder, and a second end side arranged outside the cylinder.
  • a cylinder device having a rod that moves in an axial direction, and having a bottomed cylindrical shape having a bottom portion and a cylindrical side wall portion from a blank material and having a concave portion or a convex portion on the inner surface side of the bottom portion.
  • most of the outer periphery of the intermediate formed body may be formed by a spinning process.
  • the cylinder device is formed by an inner cylinder, the cylinder and the inner cylinder.
  • a reservoir chamber, and a body valve disposed between the bottom of the cylinder and the inner cylinder to partition the chamber in the inner cylinder and the reservoir chamber;
  • a body valve assembling step for assembling the body valve to the cylinder so that a space between the recess and the body valve is a flow path between the chamber in the inner cylinder and the reservoir chamber. Further, it may be included.
  • the intermediate formed body processing step includes an R surface on the center side on the outer surface of the bottom portion.
  • a bottom processing step of forming a flat surface on the outer peripheral side may be included.
  • a cylinder device 11 shown in FIG. 1 is a shock absorber used for a suspension device of a vehicle such as an automobile or a railway vehicle, and is a double-tube shock absorber.
  • the cylinder device 11 includes an inner tube 12 (inner cylinder) and a base shell 14 (cylinder) that is a cylinder.
  • the inner tube 12 is a cylindrical member in which a working liquid is enclosed.
  • the base shell 14 has a larger diameter than the inner tube 12 and is provided on the outer peripheral side of the inner tube 12.
  • the base shell 14 forms a reservoir chamber 13 in which a working liquid and a working gas are enclosed with the inner tube 12.
  • the base shell 14 has a bottomed cylindrical shape and is an integrally molded product made of a single metal member.
  • the base shell 14 includes a side wall portion 17 and a bottom portion 18.
  • the side wall portion 17 has a cylindrical shape, and the central axis is the central axis of the base shell 14.
  • the end of the center axis on the bottom 18 side is referred to as a first end, and the end opposite to the bottom 18 in the axial direction is referred to as a second end.
  • the bottom portion 18 closes the first end side in the axial direction of the side wall portion 17.
  • the bottom 18 has a bottom main body 21, an outer bottom protrusion 22, a protrusion 23, and a recess 24.
  • the bottom main body 21 is curved in a spherical shape so as to swell outward in the axial direction of the base shell 14.
  • the bottom main body 21 swells so as to be positioned on the outer side in the axial direction toward the radial center of the base shell 14.
  • the bottom main body 21 has a spherical R surface 31 on the outer surface and a spherical R surface 32 on the inner surface.
  • the R surfaces 31 and 32 are also curved so that the radial center side of the base shell 14 is located on the outer side in the axial direction.
  • the center of each spherical surface of the R surfaces 31 and 32 is arranged on the central axis of the base shell 14.
  • the bottom 18 has a shape protruding to the outer surface side.
  • the outer bottom projecting portion 22 projects from the outer peripheral portion of the bottom main body portion 21 to the outer side in the axial direction of the base shell 14.
  • the outer bottom protrusion 22 has an annular shape.
  • the outer bottom protrusion 22 has a flat surface 35 on the radially outer side of the R surface 31.
  • the flat surface 35 is a flat surface extending perpendicularly to the central axis of the base shell 14, that is, the central axis of the side wall portion 17, and has an annular shape centering on the central axis of the base shell 14.
  • the bottom 18 has an outer peripheral surface 36 formed of a cylindrical surface across the bottom main body 21 and the outer bottom protrusion 22.
  • the outer peripheral surface 36 is a cylindrical surface centered on the central axis of the base shell 14.
  • the outer surface in the axial direction of the bottom 18 has an R surface 31 on the center side and a flat surface 35 on the outer peripheral side.
  • the convex portion 23 is provided on the inner surface side of the bottom portion 18.
  • the convex portion 23 is formed at a boundary position between the bottom main body portion 21 and the side wall portion 17 inside the base shell 14.
  • the convex portion 23 projects from the bottom main body portion 21 in the axial direction of the base shell 14, and projects from the side wall portion 17 inward in the radial direction of the base shell 14. Therefore, the convex portion 23 is provided on the inner surface side of the bottom portion 18 and is provided on the inner peripheral surface side of the side wall portion 17.
  • the convex portion 23 has an elevation surface portion 39 and an inclined surface portion 40.
  • the upright portion 39 is formed such that the tip end surface 38 on the protruding side of the convex portion 23 is at the end of the base shell 14 on the center axis side and the bottom main body portion 21 side, and is along the center axis of the base shell 14. .
  • the inclined surface portion 40 is formed on the opposite side to the bottom main body portion 21 in the elevation surface portion 39 so as to be inclined so as to approach the side wall portion 17 as the distance from the elevation surface portion 39 increases.
  • the side surfaces 41 on both sides in the circumferential direction of the base shell 14 are parallel to each other along the axial direction and the radial direction of the base shell 14.
  • a plurality of protrusions 23 are formed at equal intervals in the circumferential direction of the base shell 14, specifically, eight places.
  • a recess between the protrusions 23 adjacent to each other in the circumferential direction of the base shell 14 is recessed in the axial direction of the base shell 14 and recessed outward in the radial direction of the base shell 14 from the tip surface 38 of the protrusion 23. 24. Therefore, the concave portion 24 is also provided on the inner surface side of the bottom portion 18 and is provided on the inner peripheral surface side of the side wall portion 17. A plurality of the recesses 24 are also formed at equal intervals in the circumferential direction of the base shell 14, specifically, eight places.
  • the concave portion 24 is formed by a pair of opposing side surface portions 41 of adjacent convex portions 23, a portion of the R surface 32 of the bottom main body portion 21, and a portion of the inner peripheral surface 43 of the side wall portion 17.
  • the width of the concave portion 24 in the circumferential direction of the base shell 14 is narrower than that of the convex portion 23.
  • the side wall 17 has a cylindrical inner peripheral surface 43, a side wall main body 46, and an annular side wall protrusion 47.
  • the side wall main body 46 is cylindrical and is a cylindrical body having first and second outer peripheral surfaces 44 and 45 having the same diameter.
  • the side wall protrusion 47 is an annular portion that protrudes radially outward from the side wall main body 46.
  • the side wall main body 46 has a bottom side small diameter portion 48 on the bottom 18 side of the side wall protrusion 47 and an opening side small diameter portion 49 on the side opposite to the bottom 18 from the side wall protrusion 47, that is, the opening side. Yes.
  • the first outer peripheral surface 44 is an outer peripheral surface of the bottom side small diameter portion 48
  • the second outer peripheral surface 45 is an outer peripheral surface of the opening side small diameter portion 49.
  • the first and second outer peripheral surfaces 44 and 45 constitute the same cylindrical surface as the outer peripheral surface 36 of the bottom portion 18.
  • the side wall protruding portion 47 includes a first taper portion 51, a large diameter portion 53, a second taper portion 55, a medium diameter portion 57, and a third taper portion 59 in order from the bottom 18 side in the axial direction. is doing.
  • the 1st taper part 51 has the taper surface 52 which becomes large diameter, so that it leaves
  • the large diameter portion 53 has a large diameter surface 54 having a constant diameter larger than the first and second outer peripheral surfaces 44 and 45 on the outer peripheral side.
  • the 2nd taper part 55 has the taper surface 56 which becomes a small diameter, so that it leaves
  • the medium diameter portion 57 has a medium diameter surface 58 having a constant diameter larger than the first and second outer peripheral surfaces 44 and 45 and smaller than the large diameter surface 54 on the outer peripheral side.
  • the third taper portion 59 has a taper surface 60 having a smaller diameter on the outer peripheral side as the distance from the medium diameter surface 58 in the axial direction increases.
  • the side wall protruding portion 47 and the side wall main body portion 46 constitute an attachment portion 64 to which a spring seat 65 indicated by a two-dot chain line in FIG. 1 is attached.
  • the side wall protrusion 47 reinforces the attachment part 64 to which the spring seat 65 is attached by increasing the thickness of the side wall body part 46.
  • the spring seat 65 is attached to the side wall protruding portion 47 by press-fitting a cylindrical fitting portion 66 of the spring seat 65 into the middle diameter portion 57.
  • the side wall portion 17 is inserted into the cylindrical fitting portion 68 of the in-vehicle bracket 67 on the bottom portion 18 side.
  • the outer bottom protruding portion 22 of the bottom portion 18 is located on the inner peripheral surface of the fitting portion 68 at the position of the flat surface 35. Welded to.
  • the welding part 69 which connects the outer bottom protrusion part 22 and the fitting part 68 is formed.
  • the welding position near the boundary between the bottom main body portion 21 and the fitting portion 68 becomes a deep position in the axial direction, and the welding torch is used as the base shell 14 or the bracket. 67 easily interferes with the welding position.
  • the welding torch hardly interferes with the base shell 14 and the bracket 67, and the flat surface 35 and the fitting are satisfactorily fitted. It reaches the welding position near the boundary of the portion 68.
  • the outer bottom protruding portion 22 is not the flat surface 35 extending perpendicularly to the central axis of the base shell 14, that is, the central axis of the side wall portion 17, the outer side in the axial direction of the bottom portion 18 is longer than the extended surface of the R surface 31. As long as the surface is located at
  • the inner tube 12 has a cylindrical shape and is an integrally molded product made of a single metal member.
  • a base member 70 is attached to the inner tube 12 at a first end portion on the first end side in the axial direction.
  • the base member 70 has an annular shape.
  • the inner tube 12 is engaged with the bottom 18 of the base shell 14 via the base member 70.
  • a rod guide 71 is attached to the inner tube 12 at a second end portion on the second end side in the axial direction.
  • the rod guide 71 is annular.
  • the inner tube 12 is engaged with the side opposite to the bottom 18 of the side wall 17 of the base shell 14 via the rod guide 71.
  • the base member 70 is placed on the bottom 18 of the base shell 14 in a state of being fitted and fixed to the inner tube 12.
  • the base member 70 is placed on the R surface 32 of the bottom main body portion 21 of the bottom portion 18.
  • the base member 70 is positioned in the radial direction by the plurality of convex portions 23 of the bottom portion 18 of the base shell 14. That is, the base member 70 is fitted at the position of the elevation surface portion 39 of the plurality of convex portions 23.
  • the base member 70 is disposed coaxially with the base shell 14.
  • the base member 70 is disposed so that one end of the inner tube 12 in the axial direction is coaxial with the base shell 14.
  • the rod guide 71 is fitted to the inner tube 12 and the side wall portion 17 of the base shell 14. Accordingly, the second end portion of the inner tube 12 in the axial direction is arranged coaxially with the base shell 14 by the rod guide 71.
  • a seal member 73 is disposed on the rod guide 71 at a position opposite to the bottom portion 18. The seal member 73 is annular. The seal member 73 is also fitted to the inner peripheral portion of the side wall portion 17.
  • a locking portion 74 is formed on the base shell 14 on the side opposite to the bottom portion 18. The locking portion 74 is formed by bending the side opposite to the bottom 18 of the side wall portion 17 in the base shell 14 radially inward. The seal member 73 is locked to the locking portion 74 at the outer side in the axial direction.
  • a piston 80 is slidably fitted in the inner tube 12.
  • the piston 80 defines a first chamber 81 and a second chamber 82 in the inner tube 12.
  • the first chamber 81 is provided between the piston 80 in the inner tube 12 and the rod guide 71.
  • the second chamber 82 is provided between the piston 80 in the inner tube 12 and the base member 70.
  • the second chamber 82 in the inner tube 12 is defined by the base member 70 and the reservoir chamber 13 formed by the base shell 14 and the inner tube 12.
  • a rod 85 is connected to the piston 80 by a nut 86.
  • the rod 85 passes through the rod guide 71 and the seal member 73.
  • the rod 85 has a first end disposed inside the base shell 14 and the inner tube 12 and a second end disposed outside the base shell 14 and the inner tube 12.
  • the rod 85 has a first end connected to the base shell 14 and the piston 80 in the inner tube 12, and a second end extended to the outside of the inner tube 12 and the base shell 14.
  • the rod 85 moves in the axial direction with respect to the inner tube 12 and the base shell 14.
  • the rod 85 moves integrally with the piston 80 when moving in the axial direction.
  • the seal member 73 closes between the base shell 14 and the rod 85.
  • the seal member 73 restricts the working liquid in the inner tube 12 and the working gas and working liquid in the reservoir chamber 13 from leaking to the outside.
  • the piston 80 is formed with a first passage 91 and a second passage 92 penetrating in the axial direction.
  • the first and second passages 91 and 92 can communicate the first chamber 81 and the second chamber 82.
  • the piston 80 is provided with a disk valve 95 on the side opposite to the bottom 18 in the axial direction.
  • the disc valve 95 has an annular shape and can close the first passage 91 by contacting the piston 80.
  • the piston 80 is provided with a disk valve 96 on the bottom 18 side in the axial direction.
  • the disc valve 96 has an annular shape and can close the second passage 92 by contacting the piston 80.
  • the piston 80 moves in the direction of narrowing the second chamber 82. Accordingly, when the pressure in the second chamber 82 becomes higher than the pressure in the first chamber 81 by a predetermined value or more, the disc valve 95 opens the first passage 91. At this time, the disc valve 95 generates a damping force.
  • the disc valve 96 opens the second passage 92. At this time, the disc valve 96 generates a damping force.
  • the base member 70, the disk valve 101 disposed on the bottom 18 side in the axial direction, and the disk valve 102 disposed on the side opposite to the bottom 18 in the axial direction constitute a body valve 103.
  • the base member 70 has a disk-shaped partition part 111 and a plurality of projecting parts 112.
  • the partition 111 is fitted to the inner tube 12.
  • the plurality of projecting portions 112 project from the circumferentially spaced positions of the partition portion 111 toward the bottom 18 side.
  • the base member 70 is in contact with the R surface 32 at the plurality of protruding portions 112 and is in contact with the elevation surface portions 39 of the plurality of convex portions 23.
  • a radial passage 113 is formed between the protrusion 112 and the protrusion 112 adjacent to each other in the circumferential direction. Therefore, a plurality of radial passages 113 are also formed at equally spaced positions in the circumferential direction of the partition portion 111.
  • An intermediate chamber 114 is provided between the partition portion 111 and the bottom portion 18.
  • the radial passage 113 becomes a flow path through which the intermediate chamber 114 and the reservoir chamber 13 are circulated.
  • the phases of the concave portion 24 of the bottom portion 18 and the radial passage 113 of the base member 70 are matched in the circumferential direction of the base member 70.
  • bulb 103 become a flow path which can connect the intermediate
  • the number and width of the recesses 24 and the number and width of the radial passages 113 are such that any one of the recesses 24 and the radial passages 113 does not have to be positioned with respect to the bottom 18 in the circumferential direction.
  • the phase is set so that it always matches (the positions in the circumferential direction overlap).
  • a passage 116 and a passage 117 penetrating in the axial direction are formed in the partition portion 111.
  • the passages 116 and 117 are configured to allow the second chamber 82 in the inner tube 12 to communicate with the intermediate chamber 114 and the reservoir chamber 13 through the radial passage 113.
  • the inside of the concave portion 24 of the bottom portion 18 and the space between the concave portion 24 and the body valve 103 become a flow path capable of communicating the second chamber 82 and the reservoir chamber 13.
  • the disc valve 101 has an annular shape and can close the passage 116 by contacting the base member 70.
  • the disk valve 102 has an annular shape and can close the passage 117 by contacting the base member 70.
  • the body valve 103 is disposed between the bottom 18 in the base shell 14 and the inner tube 12.
  • the base member 70 partitions the second chamber 82 and the reservoir chamber 13 in the inner tube 12. Inside the cylinder device 11, an inner tube 12, a reservoir chamber 13, and a body valve 103 are provided.
  • the disk valve 101 is a check valve.
  • the disk valve 101 allows the flow of the working liquid from the second chamber 82 to the reservoir chamber 13 side via the passage 116 and restricts the flow of the working liquid through the passage 116 in the opposite direction.
  • the disc valve 101 opens the passage 116 when the rod 85 moves to the contraction side and the pressure in the second chamber 82 becomes higher than the pressure in the reservoir chamber 13 by a predetermined value or more.
  • the disc valve 101 is a damping valve that generates a damping force at that time.
  • the disk valve 102 is a check valve.
  • the disc valve 102 allows the flow of the working liquid from the reservoir chamber 13 to the second chamber 82 side through the passage 117 and restricts the flow of the working liquid through the passage 117 in the opposite direction.
  • the disc valve 102 opens the passage 117 when the rod 85 moves to the extension side, the piston 80 moves to the first chamber 81 side, and the pressure in the second chamber 82 falls below the pressure in the reservoir chamber 13.
  • the disk valve 102 is a suction valve that allows the working liquid to flow from the reservoir chamber 13 into the second chamber 82 without substantially generating a damping force.
  • the rod 85 is connected to the vehicle body side of the vehicle, and the base shell 14 is connected to the vehicle wheel side via the bracket 67.
  • the cylinder device 11 generates a damping force with respect to the movement of the wheel relative to the vehicle body.
  • the rod 85 and the base shell 14 receive an impact force from the outside.
  • the method for manufacturing the cylinder device according to the first embodiment is a part of the method for manufacturing the cylinder device 11.
  • the cylinder device manufacturing method according to the first embodiment is a tube forming method for manufacturing the bottomed cylindrical base shell 14 shown in FIGS. 2 and 3 before the engaging portion 74 is formed at the open end. The process shown in FIG. 4 is included.
  • a shearing process for forming the blank material 14a shown in FIG. 5 from a flat plate having a predetermined thickness is performed (step S1 shown in FIG. 4).
  • the blank material 14a has a constant thickness and a flat plate shape with a predetermined size.
  • the shearing process S1 is cold working.
  • a drawing process is performed (step S2 shown in FIG. 4).
  • the flat blank 14a shown in FIG. 5 is deep-drawn to form a bottomed cylindrical intermediate formed body 14a ′ shown in FIG.
  • Deep drawing is a kind of drawing and is performed by a press molding machine (not shown) having a die composed of a die and a punch.
  • the drawing process S2 is also cold working.
  • the deep drawing is performed in a plurality of times to gradually increase the depth of the intermediate formed body, and gradually increase the length of the intermediate formed body.
  • the intermediate formed body 14b after the drawing step S2 has a bottom having a cylindrical side wall portion 17b and a bottom portion 18b that closes the first end side in the axial direction of the side wall portion 17b by the top surface processing in the drawing step S2. It becomes an attached cylinder.
  • the bottom portion 18b is formed with a bottom main body portion 21b, an outer bottom protruding portion 22b, a convex portion 23, and a concave portion 24 by the top surface processing in the drawing step S2.
  • the bottom main body portion 21 b has R surfaces 31 and 32.
  • the R surfaces 31 and 32 are formed by a mold in the drawing step S2.
  • the outer bottom protrusion 22 b has a flat surface 35.
  • the flat surface 35 is formed by a mold in the drawing step S2.
  • the convex part 23 which has the front end surface 38, the upright surface part 39, the inclined surface part 40, and the side surface part 41 shown in FIGS. 1 and 3 is formed by a mold in the drawing step S2.
  • the recess 24 having the side surface portion 41, a part of the R surface 32 of the bottom main body portion 21, and a part of the inner peripheral surface 43 of the side wall portion 17 is also formed by a mold in the drawing step S2. That is, the inner surface side of the bottom portion 18b shown in FIG. 7 has the same shape as the inner surface side of the bottom portion 18 shown in FIGS. As shown in FIG. 7, a tapered outer peripheral surface 36b is formed on the outer peripheral side of the bottom portion 18b so as to extend toward the side wall portion 17b. The outer peripheral surface 36b has a larger diameter as it moves away from the flat surface 35 in the axial direction.
  • the drawing step S2 which is an intermediate formed body processing step includes a bottom 18b and a cylindrical side wall portion 17b from the blank material 14a, and a bottomed portion having a concave portion 24 and a convex portion 23 on the inner surface side of the bottom portion 18b.
  • a cylindrical intermediate formed body 14b is formed.
  • the bottom portion processing step which is the deep drawing processing that is performed first among the multiple deep drawing steps in the drawing step S2.
  • the outer peripheral surface 36b, and the portion of the R surface 32 excluding the recess 24 are formed. That is, the bottom surface processing step forms the R surface 31 on the center side and the flat surface 35 on the outer peripheral side on the outer surface of the bottom portion 18b.
  • the convex part 23 and the concave part 24 are formed by the uneven
  • the reason for performing the unevenness processing step after the bottom processing step is as follows.
  • the convex portion 23 and the concave portion 24 are formed first, and then the flat surface 35 of the outer bottom protruding portion 22 is formed, the convex portion 23 and the concave portion 24 may be crushed when the flat surface 35 of the outer bottom protruding portion 22 is formed. There is sex. In order to avoid this, it is preferable to form the convex portion 23 and the concave portion 24 after the plane 35. Further, in the drawing step S2, the tapered outer peripheral surface 36b is formed outside the flat surface 35, so that the metal flow during press working is improved, which is preferable in terms of forming. The tapered outer peripheral surface 36b disappears by a subsequent spinning process.
  • the intermediate molded body 14b is formed with a cylindrical side wall portion 17b continuous with the bottom portion 18b.
  • the side wall portion 17b is shorter in length and thicker than the side wall portion 17 shown in FIG. 2 after the subsequent spinning process. For this reason, as shown in FIG. 7, the intermediate molded body 14b is relatively short.
  • the side wall portion 17b of the intermediate molded body 14b has an inner peripheral surface 43b, an outer peripheral surface 44b, and an outer peripheral surface 36b formed of a tapered surface.
  • the inner peripheral surface 43 b is a cylindrical surface having substantially the same diameter as the inner peripheral surface 43 of the side wall portion 17.
  • the outer peripheral surface 44 b is a cylindrical surface having a larger diameter than the first and second outer peripheral surfaces 44 and 45 of the side wall portion 17.
  • the intermediate formed body 14b is formed from the blank material 14a by a deep drawing process, which is a kind of drawing process, is shown as the intermediate formed body processing step.
  • the intermediate formed body 14b may be formed from a solid low carbon steel rod having no hole on the inner peripheral side by using forging.
  • the side wall portion 17b of the intermediate molded body 14b may be formed by using a spinning process which is a kind of drawing process. Moreover, you may combine these methods suitably.
  • the intermediate molded body 14b is provided with a thickness (for example, 2.6 to 5.0 mm) on the side wall portion 17b.
  • the blank material 14a is drawn into the gap (clearance) between the punch and the die while applying pressure to the blank material 14a with a wrinkle suppressing plate to obtain a bottomed cylindrical shape.
  • the side wall 17b is pulled thin by the punch tip and the wrinkle restraining plate. For this reason, you may give the blank material 14a the thickness (for example, 5.0 mm or more) which anticipated the plate
  • the short intermediate molded body 14b may be formed into a bottomed cylindrical shape by expanding the clearance of the mold and giving a simple bending deformation to the blank material.
  • a spinning process is performed (step S3 shown in FIG. 4).
  • the side wall portion 17b of the intermediate molded body 14b is extended in the axial direction by a spinning process performed by a spinning machine partially shown in FIGS.
  • the spinning process S3 is also a cold process.
  • the spinning process is a rotary process.
  • the rotational processing includes screw rolling processing, gear rolling processing, profile rolling processing, cross rolling processing, helical rolling processing, disc rolling processing, rotary forging processing, rotary aging processing, and spinning processing.
  • the spinning machine has a cylindrical mandrel 201 as shown in FIG.
  • the mandrel 201 has an outer surface shape that is the same shape as the inner surface shape of the intermediate molded body 14b on the tip side, and is longer in the axial direction than the intermediate molded body 14b.
  • the mandrel 201 has a main body shaft portion 202, an engaging convex portion 203, and an engaging concave portion 204.
  • the main body shaft portion 202 has a cylindrical shape, and the center axis thereof becomes the center axis of the mandrel 201.
  • the main body shaft portion 202 is curved in a spherical shape so that the main body tip portion 205 swells outward in the axial direction of the mandrel 201.
  • the main body distal end portion 205 swells so as to be positioned on the outer side in the axial direction toward the radial center side of the mandrel 201.
  • the main body distal end portion 205 is an R surface 211 whose outer surface is spherical.
  • the R surface 211 is also curved so that the radially central side of the mandrel 201 is positioned on the outer side in the axial direction.
  • the center of the spherical surface of the R surface 211 is disposed on the central axis of the mandrel 201.
  • the main body shaft portion 202 has an outer peripheral surface 212 formed of a cylindrical surface.
  • the outer peripheral surface 212 is a cylindrical surface centered on the central axis of the mandrel 201.
  • the outer peripheral surface 212 is a cylinder having an outer diameter substantially the same as the inner diameter of the side wall portion 17b.
  • the engaging recess 204 is provided on the outer peripheral side of the main body tip portion 205 of the main body shaft portion 202.
  • the engaging recess 204 is recessed from the R surface 211 in the axial direction and the radial direction of the mandrel 201.
  • a plurality of engaging recesses 204 are formed at equal intervals in the circumferential direction of the mandrel 201.
  • the same number of engagement recesses 204 as the protrusions 23 of the intermediate molded body 14b are provided, and all the engagement recesses 204 can be engaged with the corresponding protrusions 23 one by one.
  • an engagement projection 203 that protrudes outward in the axial direction and the radial direction of the mandrel 201 from the bottom surface of the engagement recess 204. Yes. Therefore, a plurality of engaging projections 203 are also formed at equal intervals in the circumferential direction of the mandrel 201.
  • the engagement convex portion 203 is narrower in the circumferential width of the base shell 14 than the engagement concave portion 204.
  • the engaging convex portion 203 is a part of the main body distal end portion 205, and the main body distal end portion 205 including the engaging convex portion 203 and the engaging concave portion 204 form the distal end portion 215 of the mandrel 201.
  • the mandrel 201 having the engaging convex portion 203 and the engaging concave portion 204 at the tip end portion 215 is inserted into the inner peripheral side of the intermediate molded body 14b with the tip end portion 215 at the top.
  • the phases of the engaging convex portion 203 and the concave portion 24 are matched, and the phases of the engaging concave portion 204 and the convex portion 23 are matched.
  • the engaging convex portion 203 enters and engages with the concave portion 24 of the intermediate molded body 14b, and the engaging concave portion 204 engages with the convex portion 23 of the intermediate molded body 14b.
  • the R surface 211 of the main body distal end portion 205 comes into contact with the R surface 32 of the bottom main body portion 21b by surface contact.
  • the protrusion height of the engagement protrusion 203 is slightly smaller than the depth of the recess 24, and the protrusion The protruding height of the portion 23 may be slightly smaller than the depth of the engaging recess 204.
  • the intermediate molded body 14b is prevented from rotating relative to the mandrel 201, that is, is prevented from rotating. It becomes a state.
  • the bottom portion 18b is preferably thick because an axial force is applied. For this reason, it is desirable to make the bottom 18b into the final shape excluding the tapered outer peripheral surface 36b in the drawing step S2.
  • the R surfaces 31, 32 of the bottom main body portion 21, the flat surface 35 of the outer bottom protrusion portion 22, the convex portion 23, and the concave portion 24 are intermediate molded bodies before the spinning process S3. It forms in drawing process S2 which is a process process.
  • the spinning machine has a center jig 200 shown in FIG. 8 and a plurality of rollers 221.
  • the center jig 200 sandwiches the bottom 18b of the intermediate molded body 14b with the mandrel 201 inserted thereinto between the mandrel 201 and the center jig 200. In this state, the center jig 200 rotates integrally with the mandrel 201 around the central axis of the mandrel 201.
  • the engaging convex portion 203 is engaged with the concave portion 24 and the engaging concave portion 204 is engaged with the convex portion 23 to prevent the intermediate molded body 14b from rotating with respect to the mandrel 201.
  • the center jig 200 and the mandrel 201 are rotated together with the bottom 18b of the intermediate molded body 14b being sandwiched therebetween. Then, the intermediate molded body 14b also rotates integrally with the center jig 200 and the mandrel 201.
  • the outer peripheral side of the bottom 18b and the side wall 17b of the intermediate molded body 14b is rotated by the center jig 200 and the mandrel 201.
  • the outer peripheral side of the bottom 18b and the side wall 17b of the intermediate molded body 14b that is rotated from the end of the bottom 18b opposite to the side wall 17b.
  • the spinning process is a process of extending the entire length of the intermediate molded body 14b by thinning the side wall portion 17b of the intermediate molded body 14b to an appropriate thickness by plastic deformation.
  • the plurality of rollers 221 are simultaneously moved in the axial direction and the radial direction of the intermediate molded body 14b with the positions in the axial direction aligned with the intermediate molded body 14b.
  • the positions of the tapered outer peripheral surfaces 36b of the bottom 18b and the side wall 17b shown in FIG. 8 are processed into a cylindrical surface.
  • the bottom 18 is formed by forming the outer peripheral surface 36 having a constant diameter shown in FIG.
  • the cylindrical outer peripheral surface 44b of the side wall portion 17b is processed into a small-diameter cylindrical surface, and the first outer peripheral surface 44 having a constant diameter shown in FIG.
  • the bottom side small diameter portion 48 having the following is formed.
  • the plurality of rollers 221 are moved in the axial direction while escaping radially outward to form the first tapered portion 51 having the tapered surface 52 that gradually increases in diameter.
  • the large-diameter portion 53 having the large-diameter surface 54 having a constant diameter is formed by moving the plurality of rollers 221 in the axial direction.
  • a second tapered portion 55 having a tapered surface 56 that gradually decreases in diameter is formed by moving the rollers 221 in the axial direction while moving the rollers 221 inward in the radial direction.
  • a plurality of rollers 221 are moved in the axial direction to form a medium diameter portion 57 having a medium diameter surface 58 with a constant diameter.
  • a third tapered portion 59 having a tapered surface 60 that gradually decreases in diameter is formed by moving the plurality of rollers 221 in the axial direction while moving the rollers 221 inward in the radial direction.
  • the opening-side small-diameter portion 49 having the second outer peripheral surface 45 having a constant diameter is formed.
  • the bottom side small diameter part 48, the first taper part 51, the large diameter part 53, the second taper part 55, the medium diameter part 57, the third taper part 59 and the opening side small diameter part 49 are all formed by spinning.
  • the side wall portion 17 is plastically deformed by spinning over the entire length to form the side wall main body portion 46 and the side wall protruding portion 47.
  • the attaching part 64 which was expanded in diameter by conventional bulge processing can be simultaneously formed by spinning processing. Therefore, productivity can be improved.
  • the side wall portion 17b of the intermediate molded body 14b shown in FIG. 8 before the spinning process S3 is extended in the axial direction by the spinning process, as shown in FIGS.
  • a small diameter portion 48, a first taper portion 51, a large diameter portion 53, a second taper portion 55, a medium diameter portion 57, a third taper portion 59, and an opening side small diameter portion 49 are formed.
  • the outer diameter of the large diameter surface 54 of the large diameter portion 53 becomes the maximum outer diameter in the base shell 14 and the side wall portion 17.
  • the length of the side wall portion 17 after the spinning process step S ⁇ b> 3 is longer than the length of the side wall protruding portion 47, including the bottom side small diameter portion 48 and the opening side small diameter portion 49.
  • the entire side wall portion 17b of the intermediate formed body 14b shown in FIG. In other words, in the base shell 14 shown in FIG. 2, the entire side wall portion 17 is processed to have an outer diameter that is equal to or smaller than the large-diameter surface 54.
  • the bottom part 18b formed by the top surface process in the drawing process S2 is not deformed except for the outer peripheral part.
  • the end of the side wall main body 46 on the side opposite to the bottom 18 after the spinning process S3 is a portion where a locking portion 74 (see FIG. 1) is formed later.
  • the base shell 14 shown in FIGS. 2 and 3 is obtained.
  • the base shell 14 has a side wall portion 17 having a wall thickness less than that of the side wall portion 17b and long in the axial direction.
  • the spinning process is a rotating process of a plate material or a pipe material. Spinning processes include drawing-spinning-conventional spinning, shear spinning, and rotary spinning (tube spinning, flow forming).
  • the spinning processing step S3 of the first embodiment is a rotary ironing (flow forming) step, and the side wall portion 17b is plastically deformed and thinned to extend in the axial direction to form the side wall portion 17.
  • parallel swaging may be applied in addition to the above-described rotary ironing.
  • Parallel swaging is a method used for drawing the end of a tube.
  • the end of the blank tube is ironed between the mandrel and the die. For this reason, it is difficult for the parallel swaging process to form the tube wall in a plurality of steps.
  • parallel swaging can reduce the wall thickness as it moves in the direction of movement.
  • FIG. 2 it is difficult to perform parallel swaging so as to increase the thickness in the processing movement direction.
  • the mandrel 201 into which the raw tube is inserted is rotated, and the tube wall is squeezed by a plurality of rollers 221 to be extended in the axial direction.
  • the clearance with the mandrel 201 is numerically controlled so that the plurality of rollers 221 are simultaneously moved in the axial direction and the radial direction of the pipe.
  • the base shell 14 having a plurality of steps on the tube wall can be formed.
  • the tube has been partially bulged. If the pipe wall can be formed into a stepped shape in the spinning process S3, a process of partially bulging such a pipe becomes unnecessary. Thereby, manufacturing cost can be reduced.
  • the intermediate molded body 14b is work-hardened in the drawing process S2 described above.
  • the processing conditions of the spinning processing step S3 are optimized to suppress the occurrence of peeling of the surface layer and the deterioration of the surface properties due to a decrease in the ductility of the intermediate molded body 14b.
  • conditions that can improve the machining accuracy and surface properties and shorten the cycle time are selected. Factors that determine these conditions include factors such as the number of rotations, shape, and feed speed of the roller 221, processing method (front, back, multi-pass), and lubrication / coolant.
  • the plurality of rollers 221 can be separated from the intermediate molded body 14b in the radial direction at the position of the large-diameter portion 53.
  • the large-diameter portion 53 is not formed by the spinning process, and the large-diameter portion 53 remains in the state after the drawing process S2 before the spinning process S3.
  • the large diameter portion 53 of the side wall protrusion 47 is not plastically deformed by spinning.
  • the bottom side small diameter portion 48, the first taper portion 51, the large diameter portion 53, the second taper portion 55, the medium diameter portion 57, the third taper portion 59, and the opening side small diameter portion 49 for the side wall portion 17, the bottom side small diameter portion 48, the first taper portion 51, the large diameter portion 53, the second taper portion 55, the medium diameter portion 57, the third taper portion 59, and the opening side small diameter portion 49.
  • the bottomed cylindrical base shell 14 is manufactured while thinly extending the portion of the side wall portion 17 other than the large-diameter portion 53 by spinning. Also at this time, the thickness of the side wall portion 17 is not increased by moving the material from other parts by spinning. Thereby, the thickness of the position of the large diameter part 53 after spinning process S3 becomes substantially equal to the thickness of the side wall part 17b of the intermediate molded body 14b shown in FIG. 7 before the spinning process S3.
  • the intermediate molded body 14b has an outer diameter equal to or smaller than the outer diameter of the large diameter portion 53.
  • the base shell 14 after the spinning step S3 has a bottom side small diameter part 48, a first taper part 51, a second taper part 55, a medium diameter part 57, and a third taper rather than the length of the large diameter part 53.
  • the combined length of the portion 59 and the opening-side small diameter portion 49 is longer.
  • a cleaning process for cleaning the base shell 14 is performed (step S4 shown in FIG. 4).
  • a sub-assembly process for assembling parts to be assembled to the base shell 14 is performed.
  • one end of the inner tube 12 is fitted to the base member 70 of the body valve 103 shown in FIG.
  • the piston 80 of the rod 85 in a state where the piston 80 is attached by the nut 86 is fitted into the inner tube 12.
  • the rod guide 71 supported by the rod 85 is fitted to the other end of the inner tube 12.
  • the base member 70 of the body valve 103 is inserted into a portion surrounded by the plurality of convex portions 23 of the bottom portion 18 of the base shell 14, and is placed at the position of the elevation surface portion 39 of the plurality of convex portions 23. It is fitted and placed on the R surface 32 of the bottom 18.
  • the recesses 24 of the bottom 18 and the radial passage 113 of the base member 70 are in phase with each other without positioning with respect to the bottom 18.
  • the space between the recess 24 and the body valve 103 and the inside of the recess 24 become a flow path capable of communicating the second chamber 82 and the reservoir chamber 13 in the inner tube 12.
  • a caulking process is performed in which the locking member 74 is formed on the side wall portion 17 by caulking while the seal member 73 supported by the rod 85 is pressed against the rod guide 71.
  • the cylinder device 11 is manufactured through the above steps. Thereafter, the bracket 67 is welded to the bottom 18 side, or the spring seat 65 is press-fitted into the medium diameter portion 57 and attached. The bracket 67 and the spring seat 65 may be attached after the cleaning process and before the body valve assembly process.
  • Patent Document 1 described above describes a shock absorber in which a piston cylinder is integrally formed into a simple bottomed cylinder by deep drawing. Thereby, the shock absorber of patent document 1 does not require a cutting process or a welding process. However, if the cylinder is molded by deep drawing, the accuracy may be reduced. In particular, when a long cylinder is formed by deep drawing, the straightness of a mold or a press machine becomes a problem. If a long cylinder is formed by deep drawing, there may be a case where required variation in thickness and straightness cannot be ensured. In addition, production of a long cylinder by deep drawing requires a high stroke press machine. As a result, the amount of capital investment increases, and the effect of reducing welding and cost reduction of the inspection process is offset. In addition, in deep drawing, even if the product diameter is made common, dies must be prepared for each length. For this reason, cost will become still higher.
  • the base shell 14 is formed including the drawing step S2 and the spinning step S3.
  • a bottomed cylindrical intermediate formed body 14b having a bottom portion 18b and a side wall portion 17b is formed from the flat blank material 14a by drawing.
  • the side wall 17b is formed by extending the side wall 17b of the intermediate molded body 14b in the axial direction by spinning.
  • the short side wall portion 17b having a simple shape is formed while the bottom portion 18 having a complicated shape is formed, thereby obtaining the intermediate molded body 14b.
  • the pressure load necessary for forming the short intermediate formed body 14b can be made relatively small. Therefore, the short intermediate formed body 14b can be processed with a short punch. For this reason, it is possible to improve the variation in thickness and straightness with a small amount of bending.
  • the long side shell 14 is formed by extending the side wall portion 17b of the intermediate formed body 14b thus formed in the axial direction in the spinning process S3.
  • the spinning process S3 can be performed while suppressing variations in thickness and a decrease in straightness.
  • the spinning processing step S3 can be corrected while processing the thickness variation and straightness of the side wall portion 17b with high processing accuracy. For this reason, with respect to the base shell 14, it is possible to suppress a reduction in processing accuracy such as a variation in thickness and a decrease in straightness. Even if an inexpensive low carbon steel such as a hot rolled steel plate (for example, SPHE) is used as a material, it can secure the same strength as a high strength steel plate (for example, a 590 grade high strength steel plate (HITEN 590)) by work hardening. Cost can be reduced.
  • SPHE hot rolled steel plate
  • HITEN 590 590 grade high strength steel plate
  • the base shell of the cylinder device there is a method of forming a bottom portion by closing an end portion of a cylindrical material by hot spinning as in Patent Document 2.
  • hot working and welding may cause contamination and liquid leakage due to poor conditions.
  • the bottom cap is pressed into the bottom, the number of parts increases.
  • the manufacturing method of the cylinder device according to the first embodiment the base shell 14 can be formed by cold working and can be formed without welding. Therefore, the occurrence of contamination and the possibility of liquid leakage can be reduced. Therefore, quality can be stabilized.
  • the liquid leakage inspection can be omitted, and the cost can be reduced. Since it is not the method of forming a bottom part by another part, the number of parts can be decreased.
  • a short intermediate formed body 14b having a thickness of 2.6 mm, 2.9 mm, 3.2 mm, 5.0 mm, or the like is formed by the drawing step S2.
  • the side wall portion 17b is thinned to, for example, 1.0 mm, 1.2 mm, 1.4 mm, 2.6 mm, 2.9 mm, 3.2 mm, etc. by the spinning processing step S3 to form the side wall main body portion 46.
  • the final length of the side wall portion 17 is adjusted.
  • the manufacturing method of the cylinder device according to the first embodiment is suitable for multi-product mass production.
  • the base shell 14 in which the bottom portion 18 and the side wall portion 17 are integrally formed a portion that is smaller than the thickness of the bottom portion 18 is provided in the side wall portion 17.
  • low carbon steel such as cold rolled steel plate (for example, SPCC, SPCD, SPCE) or hot rolled steel plate (for example, SPHC, SPHD, SPHE) is used as a material.
  • a Vickers hardness (compressive strength) of 200 HV comparable to that of a 590 grade high strength steel sheet can be obtained.
  • the blank 18a in the drawing step S2 which is an intermediate formed body processing step, has a bottom 18b and a cylindrical side wall 17b and is recessed on the inner surface side of the bottom 18b.
  • a bottomed cylindrical intermediate formed body 14b having 24 and convex portions 23 is formed.
  • the mandrel 201 is inserted into the inner peripheral side of the intermediate molded body 14b, the engaging convex portion 203 of the mandrel 201 is engaged with the concave portion 24 of the intermediate molded body 14b, and the engaging concave portion 204 is convex.
  • the intermediate molded body 14b is spun on the outer peripheral side of the intermediate molded body 14b in a state in which the intermediate molded body 14b is prevented from rotating with respect to the mandrel 201 by being engaged with the portion 23, thereby extending the entire length of the intermediate molded body 14b.
  • the intermediate molded body 14b can be prevented from slipping in the rotation direction with respect to the mandrel 201. Therefore, in the spinning process, it is possible to suppress a decrease in machining accuracy and a machining defect due to slip of the intermediate formed body 14b due to an excessive machining load.
  • the intermediate molded body 14b can be prevented from rotating with respect to the mandrel 201, it is sufficient that at least one engaging convex portion 203 and concave portion 24 to be engaged with each other are formed. Furthermore, by providing a plurality of engaging projections 203 and a plurality of recesses 24, phase alignment for engagement becomes easy and the life of the mandrel 201 is improved. Similarly, it is sufficient that at least one engaging recess 204 and protrusion 23 that are engaged with each other are formed. Furthermore, by providing a plurality of engagement recesses 204 and a plurality of protrusions 23, phase alignment for engagement is facilitated, and the life of the mandrel 201 is improved.
  • the body valve 103 when the body valve 103 is assembled to the base shell 14, the space between the recess 24 of the base shell 14 and the body valve 103 and the interior of the recess 24 are the second chamber 82 in the inner tube 12. And a flow path capable of flowing through the reservoir chamber 13. For this reason, the body valve 103 can be reduced in size by the passage area of the recess 24, and the weight can be reduced.
  • an R surface 31 is formed on the center side on the outer surface of the bottom portion 18, and a flat surface 35 is formed on the outer peripheral side. Therefore, the position of the flat surface 35 can be welded at the time of welding the bracket 67 to the bottom portion 18, interference with the bracket 67 and the bottom portion 18 of the welding torch is reduced, and stable welding can be easily performed. Therefore, poor welding can be suppressed. Note that such a flat surface 35 can be formed even by the closing described in Patent Document 2.
  • the thickness of the side wall portion 17 is partially changed depending on the axial position. That is, in the side wall part 17, the side wall protrusion part 47 is formed in the attachment part 64 to which the spring seat 65 which supports a spring is fixed, and it is thicker than another part. Thereby, the intensity
  • the corner portion of the thick wall portion may cause stress concentration during assembly. For this reason, the corner portion of the thick portion may be reinforced by welding to disperse the stress.
  • the side wall portion 17A of the base shell 14A does not have the side wall protruding portion 47 of the first embodiment, and the outer peripheral side is constituted only by the outer peripheral surface 44A having a constant diameter.
  • the inner peripheral side has an inner peripheral surface 43A having a constant diameter as in the first embodiment.
  • the bottom portion 18A includes a tapered cylindrical portion 301, an annular portion 302, a tapered cylindrical portion 303, and a disc portion 304, and is formed in a convex shape on the outer surface side.
  • the tapered cylindrical portion 301 extends from the end edge portion in the axial direction of the side wall portion 17A.
  • the tapered cylindrical portion 301 is reduced in diameter as it is away from the side wall portion 17A.
  • the annular portion 302 has a flat plate shape, and extends radially inward from an end edge portion of the tapered cylindrical portion 301 on the side opposite to the side wall portion 17A.
  • the tapered tubular portion 303 extends from the edge of the annular portion 302 opposite to the tapered tubular portion 301.
  • the tapered cylindrical portion 303 is reduced in diameter as the distance from the annular portion 302 increases.
  • the disc portion 304 has a flat plate shape, and extends radially inward from an end edge portion of the tapered tubular portion 303 on the side opposite to the annular portion 302.
  • the bottom 18A is thicker than the side wall 17A in all of the tapered cylindrical portion 301, the annular portion 302, the tapered cylindrical portion 303, and the disc portion 304.
  • the tapered cylindrical portions 301 and 303 are tapered with the central axis of the base shell 14A as the center.
  • the annular portion 302 and the disc portion 304 extend perpendicular to the central axis of the base shell 14A.
  • a plurality of, more specifically, two hemispherical convex portions 23A are formed on the inner surface side of the disc portion 304 of the bottom portion 18A so as to protrude from the disc portion 304.
  • Each convex portion 23A is formed at an equal distance from the center on the diameter line passing through the center of the bottom portion 18A.
  • a mounting eye 311 is fixed to the base shell 14A by welding on the outer side of the disc portion 304 of the bottom portion 18A. Although only a part of the mounting eye 311 is shown in FIG. 11, it has a cylindrical shape as a whole.
  • the cylinder device manufacturing method according to the second embodiment is also a tube forming method for manufacturing the bottomed cylindrical base shell 14A shown in FIG. 11 before the locking portion is formed at the open end. The process shown in is included.
  • a shearing process for forming a flat blank material is performed from a flat plate having a predetermined thickness by a shearing process that is a cold working (step SA1 shown in FIG. 12).
  • a deep blanking process which is a cold work, is performed on a flat blank material to form a bottomed cylindrical intermediate molded body 14Ab shown in FIGS. (Step SA2 shown in FIG. 12).
  • the deep drawing is performed in a plurality of times (for example, twice) to gradually increase the depth of the intermediate formed body, and gradually increase the length of the intermediate formed body.
  • the bottom 18Ab is formed.
  • a plurality of convex portions 23A are also formed on the disc portion 304 by the top surface processing in the drawing step S2.
  • the intermediate molded body 14Ab is formed with a cylindrical side wall portion 17Ab continuous with the bottom portion 18Ab.
  • the side wall portion 17Ab is shorter and thicker than the side wall portion 17A (shown in FIG. 11) after the subsequent spinning step SA3.
  • intermediate forming is performed by forging from a solid low carbon steel rod having no holes on the inner peripheral side, in addition to forming the intermediate formed body 14Ab from the blank material by deep drawing.
  • the body 14Ab may be formed.
  • the intermediate molded body 14Ab may be formed by a spinning process which is a kind of drawing process. Moreover, you may combine these suitably.
  • the spinning process is a process in which the side wall portion 17Ab of the intermediate molded body 14Ab is elongated in the axial direction by spinning, which is cold working by a spinning machine having a mandrel 201A shown in FIG.
  • a mandrel 201A of the second embodiment has a main body shaft portion 202A having a constant diameter outer peripheral surface 212A and a tip portion 215A.
  • the tip end side of the mandrel 201A has an outer surface shape that is the same shape as the inner surface shape of the intermediate molded body 14Ab. Therefore, the mandrel 201A is different from the first embodiment in the shape of the tip 215A.
  • the main body shaft portion 202A has a cylindrical shape, and the central axis thereof becomes the central axis of the mandrel 201A.
  • the tip portion 215A of the mandrel 201A of the second embodiment has a tapered surface portion 321, an annular planar portion 322, a tapered surface portion 323, and a circular planar portion 324.
  • the tapered surface portion 321 extends so as to decrease in diameter in the axial direction as the distance from the end edge portion of the outer peripheral surface 212A increases.
  • the annular flat surface portion 322 has a flat plate shape and extends radially inward from an end edge portion of the tapered surface portion 321 opposite to the outer peripheral surface 212A.
  • the tapered surface portion 323 extends from the inner end edge of the annular flat surface portion 322 opposite to the tapered surface portion 321.
  • the taper surface portion 323 is reduced in diameter as the distance from the annular plane portion 322 increases.
  • the circular flat surface portion 324 extends radially inward from the edge of the tapered surface portion 323 opposite to the annular flat surface portion 322.
  • the annular flat surface portion 322 and the circular flat surface portion 324 extend perpendicular to the central axis of the mandrel 201A.
  • the tip portion 215A has a plurality of, specifically two, engagement recesses 204A that are recessed from the circular flat surface portion 324. Each engaging recess 204A is formed at an equal distance from the center on the diameter line passing through the central axis of the mandrel 201A.
  • the tapered surface portion 321 contacts the tapered tubular portion 301
  • the annular plane portion 322 contacts the annular portion 302
  • the tapered surface portion 323 contacts the tapered tubular portion 303
  • the circular planar portion 324 has a circular shape.
  • the plurality of convex portions 23A are engaged with the plurality of engaging concave portions 204A by coming into contact with the plate portion 304, respectively.
  • the intermediate molded body 14Ab is prevented from rotating with respect to the mandrel 201A by engaging both the convex portions 23A with the corresponding engaging concave portions 204A. Subsequently, the center jig 200A and the mandrel 201A are rotated together with the center jig 200A and the mandrel 201A sandwiching the bottom 18Ab of the intermediate molded body 14Ab. Then, the intermediate molded body 14Ab also rotates integrally with the center jig 200A and the mandrel 201A.
  • the outer peripheral side of the side wall portion 17Ab of the intermediate molded body 14Ab is rotated by the center jig 200A and the mandrel 201A.
  • the outer peripheral side of the side wall portion 17Ab of the intermediate molded body 14A that is being rotated is arranged on the outer side of the side wall portion 17Ab from the end of the bottom portion 18Ab opposite to the side wall portion 17Ab. Is pressed radially inward to the end opposite to the bottom 18Ab and pressed against the mandrel 201A, so that the outer peripheral side of the side wall 17Ab of the intermediate molded body 14Ab is plastically deformed and thinned to an appropriate thickness. Spinning process is performed to extend the overall length.
  • the plurality of rollers 221 move in the axial direction of the intermediate molded body 14Ab with the axial positions thereof aligned with respect to the intermediate molded body 14Ab.
  • the base shell 14A shown in FIG. 11 is obtained.
  • the base shell 14A has a side wall portion 17A that is thinner than the side wall portion 17Ab, is longer in the axial direction, and has a constant outer diameter.
  • the side shell 17A of the base shell 14A is rotated and ironed by the plurality of rollers 221 so as to have a constant outer diameter.
  • step SA4 a cleaning process for cleaning the base shell 14A is performed (step SA4 shown in FIG. 12). Thereafter, an eye welding process of welding the mounting eye 311 to the outside of the bottom portion 18A is performed (step SA5 shown in FIG. 12).
  • the blank material has a bottom 18Ab and a cylindrical side wall 17Ab on the inner surface side of the bottom 18Ab.
  • a bottomed cylindrical intermediate formed body 14Ab having a convex portion 23A is formed.
  • the mandrel 201A is inserted into the inner peripheral side of the intermediate molded body 14Ab, the engaging recess 204A of the mandrel 201A is engaged with the convex part 23A, and the intermediate molded body 14Ab is rotated with respect to the mandrel 201A.
  • the outer peripheral side of the intermediate molded body 14Ab is spun and the entire length of the intermediate molded body 14Ab is extended.
  • the intermediate molded body 14Ab is prevented from slipping in the rotation direction with respect to the mandrel 201A. Therefore, in the spinning process, it is possible to suppress a processing failure caused by the slip of the intermediate molded body 14Ab due to an excessive processing load.
  • the number of the engaging recesses 204A of the mandrel 201A and the protrusions 23A of the intermediate molded body 14Ab may be formed at least one at a time.
  • a recess may be formed on the bottom 18Ab instead of the protrusion 23A.
  • a plurality of concave portions are formed on the inner surface side of the annular portion 302 of the bottom portion 18Ab.
  • four concave portions 24A recessed in a hemispherical shape are formed at equal intervals in the circumferential direction at positions equidistant from the center of the bottom portion 18Ab.
  • a plurality of concave portions 24 ⁇ / b> A are also formed in the annular portion 302 during the processing of the top surface.
  • a spinning process is performed in which the side wall portion 17Ab of the intermediate molded body 14Ab is extended in the axial direction by a spinning process which is a cold process by a spinning machine (step SA3 shown in FIG. 12).
  • the mandrel 201A has a plurality of engaging protrusions, specifically, four engaging protrusions 203A, at the front end portion 215A protruding from the annular flat surface portion 322.
  • These engagement convex portions 203A are formed at equal intervals in the circumferential direction at positions equidistant from the central axis of the mandrel 201A.
  • the tapered surface portion 321 contacts the tapered tubular portion 301
  • the annular plane portion 322 contacts the annular portion 302
  • the tapered surface portion 323 contacts the tapered tubular portion 303
  • the circular planar portion 324 has a circular shape.
  • the plurality of engaging projections 203A are engaged with the plurality of recesses 24A, respectively, in contact with the plate portion 304.
  • the spinning step SA3 is performed in a state where the intermediate molded body 14Ab is prevented from rotating with respect to the mandrel 201A by engaging the plurality of concave portions 24A with the plurality of engaging convex portions 203A.
  • the mandrel 201A is inserted into the inner peripheral side of the intermediate molded body 14Ab, and the engagement convex portion 203A of the mandrel 201A is engaged with the concave portion 24A of the intermediate molded body 14Ab.
  • Spinning is performed on the outer peripheral side of the intermediate molded body 14Ab in a state where 14Ab is prevented from rotating with respect to the mandrel 201A, thereby extending the entire length of the intermediate molded body 14Ab. Since the spinning process is performed while the intermediate molded body 14Ab is prevented from rotating with respect to the mandrel 201A, the intermediate molded body 14Ab can be prevented from slipping in the rotation direction with respect to the mandrel 201A.
  • the number of the engaging convex portions 203A of the mandrel 201A and the concave portions 24A of the intermediate molded body 14b may be formed at least one at a time.
  • the above cylinder device 11 can be applied to various automobiles, robots, press machines, transporters, upper and lower parts of chairs, door opening and closing parts, and the like.
  • the first aspect of the cylinder device manufacturing method includes a bottomed cylindrical cylinder, one end connected to a piston in the cylinder and the other end arranged outside the cylinder, and moves in the axial direction with respect to the cylinder. And a cylinder device having a bottomed cylindrical shape having a bottom portion and a cylindrical side wall portion from a blank material and having a concave portion or a convex portion on the inner surface side of the bottom portion.
  • the spinning process is performed in a state where the intermediate molded body is prevented from rotating with respect to the mandrel, the intermediate molded body is prevented from sliding in the rotation direction with respect to the mandrel. Accordingly, it is possible to suppress a reduction in processing accuracy and a processing failure due to slip of the intermediate molded body in the spinning process.
  • the cylinder device includes an inner cylinder, a reservoir chamber formed by the cylinder and the inner cylinder, a bottom portion of the cylinder, and the inner cylinder. And a body valve that divides the chamber in the inner cylinder and the reservoir chamber from each other, and forms the recess in the intermediate molded body processing step. There is further included a body valve assembling step for assembling the body valve to the cylinder so that a space is formed between the chamber in the inner cylinder and the reservoir chamber.
  • the inside of the recess and the space between the recess of the cylinder and the body valve serve as a flow path that can flow between the chamber in the inner cylinder and the reservoir chamber. For this reason, the body valve can be reduced in size by the flow path area of the recess, and the weight can be reduced.
  • the intermediate molded body processing step includes a bottom processing step of forming an R surface on the center side and a flat surface on the outer peripheral side on the outer surface of the bottom portion. Including.
  • the bottom processing step in order to form a flat surface on the outer peripheral side of the outer surface of the bottom portion, for example, when welding the bracket to the bottom portion, by welding the position of the flat surface, to the bracket and the bottom portion of the welding torch Interference is reduced and stable welding can be performed easily.
  • shock absorber it is possible to provide a method of manufacturing a cylinder device that can suppress a decrease in processing accuracy.
  • Cylinder device 12 Inner tube (inner cylinder) 13 Reservoir chamber 14 Base shell (cylinder) 14a Blank material 14b, 14Ab Intermediate molded body 17b, 17Ab Side wall part 18b, 18Ab Bottom part 23, 23A Convex part 24, 24A Concave part 31 R surface (outer surface) 35 Plane 80 Piston 82 Second chamber (chamber in the inner cylinder) 85 Rod 103 Body valve 201, 201A Mandrel 203, 203A Engaging projection 204, 204A Engaging recess

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Fluid-Damping Devices (AREA)
  • Shaping Metal By Deep-Drawing, Or The Like (AREA)

Abstract

La présente invention concerne un procédé de fabrication d'un dispositif du type cylindre caractérisé par la formation d'un cylindre à fond, le procédé comprenant : une étape de traitement de corps moulé intermédiaire consistant à former, à partir d'un matériau d'ébauche, un corps moulé intermédiaire cylindrique à fond présentant un fond et une paroi latérale cylindrique et présentant une partie évidée ou une partie saillante sur la face interne du fond ; et une étape de traitement de filage consistant à insérer un mandrin ayant une partie saillante de mise en prise ou une partie évidée de mise en prise pouvant venir en prise avec la partie évidée ou la partie saillante du corps moulé intermédiaire, dans le côté circonférentiel interne du corps moulé intermédiaire, et s'étendant sur toute la longueur du corps moulé intermédiaire par traitement par rotation du côté circonférentiel externe du corps moulé intermédiaire dans un état dans lequel le corps moulé intermédiaire est arrêté par tourbillonnement par rapport au mandrin par mise en prise de la partie saillante de mise en prise ou de la partie évidée de mise en prise avec la partie évidée ou la partie saillante.
PCT/JP2017/034732 2016-09-27 2017-09-26 Procédé de fabrication de dispositif du type cylindre WO2018062176A1 (fr)

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JP2016188039A JP2019206972A (ja) 2016-09-27 2016-09-27 シリンダ装置の製造方法
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Cited By (1)

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CN112474983A (zh) * 2020-11-16 2021-03-12 西安航天动力机械有限公司 一种外带环形凸台的薄壁圆筒及其旋压工艺方法

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2024161456A1 (fr) * 2023-01-30 2024-08-08 日立Astemo株式会社 Procédé de formation de partie inférieure, corps tubulaire et dispositif d'amortissement

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JPS53110940U (fr) * 1977-02-10 1978-09-05
JP2001030018A (ja) * 1999-07-19 2001-02-06 Sango Co Ltd スピニング加工による有底筒体の製造方法及び装置
JP2002333049A (ja) * 2001-05-10 2002-11-22 Maruyasu Industries Co Ltd ショックアブソーバ
JP2010234425A (ja) * 2009-03-31 2010-10-21 Hitachi Automotive Systems Ltd クロージング加工装置およびクロージング加工方法
JP2012207674A (ja) * 2011-03-29 2012-10-25 Kyb Co Ltd 複筒型緩衝器
WO2017122385A1 (fr) * 2016-01-15 2017-07-20 日立オートモティブシステムズ株式会社 Procédé de production de dispositif de cylindre

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS53110940U (fr) * 1977-02-10 1978-09-05
JP2001030018A (ja) * 1999-07-19 2001-02-06 Sango Co Ltd スピニング加工による有底筒体の製造方法及び装置
JP2002333049A (ja) * 2001-05-10 2002-11-22 Maruyasu Industries Co Ltd ショックアブソーバ
JP2010234425A (ja) * 2009-03-31 2010-10-21 Hitachi Automotive Systems Ltd クロージング加工装置およびクロージング加工方法
JP2012207674A (ja) * 2011-03-29 2012-10-25 Kyb Co Ltd 複筒型緩衝器
WO2017122385A1 (fr) * 2016-01-15 2017-07-20 日立オートモティブシステムズ株式会社 Procédé de production de dispositif de cylindre

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112474983A (zh) * 2020-11-16 2021-03-12 西安航天动力机械有限公司 一种外带环形凸台的薄壁圆筒及其旋压工艺方法
CN112474983B (zh) * 2020-11-16 2023-12-29 西安航天动力机械有限公司 一种外带环形凸台的薄壁圆筒及其旋压工艺方法

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