EP2380679A1 - Schmiedeverfahren - Google Patents

Schmiedeverfahren Download PDF

Info

Publication number
EP2380679A1
EP2380679A1 EP09830407A EP09830407A EP2380679A1 EP 2380679 A1 EP2380679 A1 EP 2380679A1 EP 09830407 A EP09830407 A EP 09830407A EP 09830407 A EP09830407 A EP 09830407A EP 2380679 A1 EP2380679 A1 EP 2380679A1
Authority
EP
European Patent Office
Prior art keywords
workpiece
primary
claws
pair
forming
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.)
Withdrawn
Application number
EP09830407A
Other languages
English (en)
French (fr)
Other versions
EP2380679A4 (de
Inventor
Masahiro Sato
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.)
Resonac Holdings Corp
Original Assignee
Showa Denko KK
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 Showa Denko KK filed Critical Showa Denko KK
Publication of EP2380679A1 publication Critical patent/EP2380679A1/de
Publication of EP2380679A4 publication Critical patent/EP2380679A4/de
Withdrawn legal-status Critical Current

Links

Images

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21K—MAKING FORGED OR PRESSED METAL PRODUCTS, e.g. HORSE-SHOES, RIVETS, BOLTS OR WHEELS
    • B21K27/00—Handling devices, e.g. for feeding, aligning, discharging, Cutting-off means; Arrangement thereof
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21K—MAKING FORGED OR PRESSED METAL PRODUCTS, e.g. HORSE-SHOES, RIVETS, BOLTS OR WHEELS
    • B21K27/00—Handling devices, e.g. for feeding, aligning, discharging, Cutting-off means; Arrangement thereof
    • B21K27/02—Feeding devices for rods, wire, or strips
    • B21K27/04—Feeding devices for rods, wire, or strips allowing successive working steps
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21J—FORGING; HAMMERING; PRESSING METAL; RIVETING; FORGE FURNACES
    • B21J5/00—Methods for forging, hammering, or pressing; Special equipment or accessories therefor
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21K—MAKING FORGED OR PRESSED METAL PRODUCTS, e.g. HORSE-SHOES, RIVETS, BOLTS OR WHEELS
    • B21K1/00—Making machine elements
    • B21K1/18—Making machine elements pistons or plungers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B30—PRESSES
    • B30B—PRESSES IN GENERAL
    • B30B13/00—Methods of pressing not special to the use of presses of any one of the preceding main groups

Definitions

  • the present invention relates to a forging method for forging a workpiece which is being transferred, and also to its related technologies.
  • a multistage forging device configured to perform forming of a workpiece by a number of consecutive forging processing is well known.
  • a conventional multistage forging device is equipped with primary forming dies for performing primary forming of a workpiece, secondary forming dies for performing secondary forming of the workpiece to which the primary forming was performed, and a transfer device for transferring the workpiece form the primary forming dies to the secondary forming dies.
  • the transfer device is typically equipped with a pair of feed bars arranged in parallel on both sides of a transferring line, and a pair of claws formed on the inner sides of the pair of feed bars opposed with each other.
  • a workpiece primary formed member
  • a workpiece secondary formed member
  • the feed bars While keeping the chucked state, the feed bars are moved toward the downstream side along the transferring line and the workpiece is moved to a position corresponding to the secondary forming dies.
  • the pair of feed bars is opened (i.e., moved away from each other) to release the chucking of the workpiece, whereby the workpiece is set to the secondary forming dies.
  • the primary formed member formed by the primary forming has a shape having a volume balance previously and thoroughly calculated to prevent occurrence of defects during the secondary forming. Therefore, when the primary formed member is set to the secondary forming dies, if the primary formed member is displaced from the intended position, there arises a problem that the secondary forming cannot be performed accurately, resulting in occurrence of defects (forming defects) such as lack or engulfment of material in various detail portions.
  • Preferred embodiments of the present invention are made in view of the abovementioned and/or other problems in the related arts.
  • the preferred embodiments of the present invention significantly improve the existing methods and/or devices.
  • the present invention aims to provide, in view of the problems described above, a forging method and its related technologies capable of preventing occurrence of possible displacement of a workpiece at the time of transferring the workpiece from an upstream side workpiece processing section such as primary forming dies to a downstream side workpiece processing section such as secondary forming dies, and also capable of forging the workpiece with a high degree of accuracy.
  • the present invention has the following structure.
  • a forging method in which a workpiece disposed at a workpiece introducing section is sandwiched and held from both sides of the workpiece by and between a pair of claws provided to a pair of feed bars arranged on both sides of a transferring line by closing the feed bars, and transferred to a workpiece processing section by moving the feed bars forward with the workpiece held and then opening the feed bars, and the workpiece transferred to the workpiece processing section is subjected to forging, wherein an engaging portion is formed on the workpiece and an engaging portion receiving portion is formed on one of the claws, and wherein the workpiece is positioned by engaging the engaging portion with the engaging portion receiving portion at the time of sandwiching and holding the workpiece by and between the claws.
  • the workpiece processing section includes a plurality of workpiece processing sections arranged along the transferring line, wherein the pair of feed bars is closed to sandwich and hold the workpiece disposed at the workpiece introducing section and the workpiece disposed at the workpiece processing section by and between corresponding pair of claws, moved forward with the workpieces sandwiched and held by and between the corresponding pair of claws, and then opened to transfer the workpieces sandwiched and held by the corresponding pair of claws on the workpiece processing section and the workpiece discharging section respectively.
  • the workpiece processing section includes a primary workpiece processing section and a secondary workpiece processing section arranged at a downstream side of the primary workpiece processing section, wherein the primary workpiece processing section is constituted as a primary forming section for obtaining a primary formed member by subjecting the workpiece to die-forging as primary forming, and wherein the secondary workpiece processing section is constituted as a secondary forming section for obtaining a secondary formed member by subjecting the primary formed member to die-forging as secondary forming.
  • a forging apparatus in which a workpiece disposed at a workpiece introducing section is sandwiched and held from both sides of the workpiece by and between a pair of claws provided to a pair of feed bars arranged on both sides of a transferring line by closing the feed bars, and transferred to a workpiece processing section by moving the feed bars forward with the workpiece held and then opening the feed bars, and the workpiece transferred to the workpiece processing section is subjected to forging, wherein the workpiece is provided with an engaging portion and one of the claws is provided with an engaging portion receiving portion, and wherein the workpiece is positioned by engaging the engaging portion with the engaging portion receiving portion at the time of sandwiching and holding the workpiece with the claws.
  • a workpiece discharging section is provided at a downstream side of the workpiece processing section along the transferring line
  • the workpiece processing section includes a primary workpiece processing section and a secondary workpiece processing section arranged at a downstream side of the primary workpiece processing section
  • the pair of feed bars are closed to sandwich and hold the workpiece disposed at the workpiece introducing section and the worce disposed at the workpiece processing section by and between corresponding pair of claws
  • the feed bars are moved forward with the workpieces sandwiched and held by and between the corresponding pair of claws, and opened to transfer the workpieces sandwiched and held by the corresponding pair of claws on the workpiece processing section and the workpiece discharging section respectively
  • the primary workpiece processing section includes first forming dies for obtaining a primary formed member by subjecting the workpiece to primary forming
  • the secondary workpiece processing section includes second forming dies for obtaining a secondary formed member by
  • a workpiece transferring method in which a workpiece disposed at a workpiece introducing section is sandwiched and held from both sides of the workpiece by and between a pair of claws provided to a pair of feed bars arranged on both sides of a transferring line by closing the feed bars, and transferred to a workpiece processing section by moving the feed bars forward with the workpiece held and then opening the feed bars, wherein an engaging portion is formed on the workpiece and an engaging portion receiving portion is formed on one of the claws, and wherein the workpiece is positioned by engaging the engaging portion with the engaging portion receiving portion at the time of sandwiching and holding the workpiece by and between the claws.
  • a workpiece transferring device in which a workpiece disposed at a workpiece introducing section is sandwiched and held from both sides of the workpiece by and between a pair of claws provided to a pair of feed bars arranged on both sides of a transferring line by closing the feed bars, and transferred to a workpiece processing section by moving the feed bars forward with the workpiece held and then opening the feed bars, wherein the workpiece is provided with an engaging portion and one of the claws is provided with an engaging portion receiving portion, and wherein the workpiece is positioned by engaging the engaging portion with the engaging portion receiving portion at the time of sandwiching and holding the workpiece with the claws.
  • the engaging portion formed on the workpiece is engaged with the engaging portion receiving portion formed on one of claws to position the workpiece at the time of sandwiching and holding (chucking) the workpiece with the pair of claws, preventing possible positional displacements of the workpiecem which in turn enableshigh-precision forging.
  • the workpiece can be positioned assuredly.
  • a plurality of workpieces can be transferred in a simultaneously parallel manner, resulting in enhanced productivity.
  • the workpiece can be processed at a plurality of workpiece processing sections.
  • a forged product having a complex shape can be obtained by two steps of the primary forming and the secondary forming.
  • the engaging portion is formed on the workpiece by the primary forming, which enhances the productivity as compared with a process in which a separate step for forming the engaging portion is performed.
  • the productivity in comparison with a case in which pressing of the engaging protrusion is performed at a separate step, the productivity can be further improved.
  • a piston member as a forged product can be manufactured.
  • the primary formed member can be transferred in a stable state while positioning the primary formed member assuredly.
  • the workpiece can be positioned more assuredly by engaging the positioning protrusion with the positioning dented portion assuredly.
  • the engaging portion provided on the workpiece is engaged with the engaging portion receiving portion provided on one of claws to position the workpiece at the time of sandwiching and holding the workpiece with the pair of claws. Therefore, possible positional displacements of the workpiece can be prevented and the forging can be performed with a high degree of positional accuracy.
  • the engaging portion provided on the workpiece is engaged with the engaging portion receiving portion provided on one of claws to position the workpiece at the time of sandwiching and holding the workpiece with a pair of claws, and therefore the possible positional displacements of the workpiece can be prevented and the forging can be performed with a high degree of accuracy.
  • the engaging portion provided on the workpiece is engaged with the engaging portion receiving portion provided on one of claws to position the workpiece at the time of sandwiching and holding the workpiece with a pair of claws, and therefore possible positional displacements of the workpiece can be prevented and the forging can be performed with a high degree of positional accuracy.
  • Fig. 1 is a schematic view showing a multistage forging device to which a forging method of an embodiment of the present invention is applied
  • Fig. 2 is a side view thereof.
  • the forging device is configured to perform two types of die-forging, primary forming and secondary forming, of a workpiece W consecutively transferred by a transfer device 4.
  • a workpiece introducing section 50, primary and secondary forming sections 51 and 52, and a workpiece discharging section 53 are arranged in this order.
  • the members constituting the forging device and other devices such as the dies 1 and 2 and the workpiece W
  • their front views are defined as views when seen from the right side (i.e., the workpiece discharging side, or the downstream side) toward the left side (i.e., workpiece introducing side, or the upstream side).
  • the workpiece introducing section 50 is constituted by the downstream side end portion of a workpiece introducing means such as a introducing conveyer 56.
  • the workpiece W is loaded from the outside and then transferred to the conveyer end portion, i.e., the wokpiece introducing section 50, and held there.
  • the primary forming section 51 constitutes a primary workpiece processing section and the secondary forming section 52 constitutes a secondary workpiece processing section.
  • the primary forming section 51 and the secondary forming section 52 are provided with primary forming dies 1 and secondary forming dies 2, respectively.
  • a workpiece W is subjected to primary forming such as rough forming by the primary forming dies 1
  • secondary forming section 52 the workpiece W is subjected to secondary forming such as main finish forming by the secondary forming dies 2.
  • the workpiece discharging section 53 is constituted by the upstream side end portion of a workpiece discharging means such as a discharging conveyer 57.
  • the workpiece W disposed on the conveyer end portion, or the workpiece discharging section 53, is conveyed to the outside of the device by the discharging conveyer 57.
  • the forging device is provided with a transfer device 4 so that the workpiece W can be consecutively transferred from the workpiece introducing section 50 to the primary forming section 51, from the primary forming section 51 to the secondary forming section 52, and from the secondary forming section 52 to the workpiece discharging section 53 with the transfer device 4.
  • the workpiece W before performing the primary forming is denoted as a forging member W0
  • the workpiece W after performing the primary forming but before performing the secondary forming is denoted as a primary formed member W1
  • the workpiece after performing the secondary forming is denoted as a secondary formed member W2, a forged product W2, or a piston member W2.
  • the forging member W0, the primary formed member W1, and the secondary formed member W2 are collectively called "workpiece W.”
  • the piston member W2 as a secondary formed member to be manufactured by the forging device of this embodiment is provided with a circular land portion 91, and a pair of skirt-portions 92 and 92, a pair of pin-boss portions 93 and 93, and side wall portions 94 are integrally formed on one side (lower surface side) of the land portion 91.
  • the pair of skirt-portions 92 and 92 is formed on right and left side end portions of the outer circumferential portions on one side surface of the land portion 91 in a downwardly protruded manner.
  • the pair of pin-boss portions 93 and 93 is formed on front and rear sides of the middle portion of one side surface of the land portion 91 in a downwardly protruded manner.
  • the side wall portions 94 are formed on both the right and left sides of the pair of front and rear pin-boss portions 93 and 93 to connect both the right and left sides of the front side pin-boss portion 93 and corresponding front end portions of the pair of skirt-portions 92 and 92 and connect both the right and left sides of the rear side pin-boss portion 93 and corresponding rear end portions of the pair of skirt-portions 92 and 92 in a downwardly protruded manner.
  • the primary formed member W1 of this embodiment has a main body portion 81 having a thick circular plate shape, and a pair of skirt scheduled portions 82 and 82 and a pair of pin-boss scheduled portions 83 and 83 are integrally formed on one surface side (lower surface side) of the main body portion 81.
  • a pair of skirt scheduled portions 82 and 82 is formed on the right and left side end portions of the outer circumferential edge portion on one surface side of the main body portion 81 so as to protrude toward the lower surface side, and will be formed into the skirt portions 92 and 92 with secondary forming.
  • a pair of pin-boss scheduled portions 83 and 83 is formed on the front and rear sides of the middle portion on one surface side of the land portion 91 so as to protrude toward the lower surface side, and will be formed into a bin-boss portions 93 and 93 with secondary forming.
  • a positioning protrusion 85 constituting an engaging portion is integrally formed on one side portion on the outer circumferential surface of the main body portion 81 so as to protrude toward one side direction (in the radially outward direction).
  • the upper portion of the positioning protrusion 85 is formed into a trapezoidal shape when seen from its above so as to correspond to the inner circumferential shape of the below-mentioned claw 42 of the feed bar 41, and slant surfaces are formed on both side portions of the trapezoid shaped protrusion 85 so that both the side portions constitute guide portions 86 and 86. Furthermore, the lower portion of the positioning protrusion 85 is formed into a slanted surface which constitutes a lower guide portion 87.
  • the forging member W0 of this embodiment has a short cylindrical shape (disk shape).
  • the forging member W0 for example, a member obtained by cutting an aluminum (including aluminum alloy) continuously-casted or extruded bar with a saw to have a volume having a predetermined weight.
  • a suitable example of the specific composition of the forging material W0 can be exemplified by an aluminum alloy containing Si: 5 to 18 mass%, Cu: 2 to 5 mass%, Mg: 0.3 to 1.0 mass%, Fe: 0.1 to 0.8 mass%, Ni: 0.2 to 3 mass%, Mn: 0.1 to 0.5 mass%, and Cr: 0.1 to 0.5 mass%.
  • the transfer device 4 of this embodiment is equipped with a pair of feed bars 41 and 41 arranged on both sides of the transferring line.
  • the pair of feed bars 41 and 41 is extended along the transferring line (in the front and rear direction) and arranged in parallel. It is configured that the pair of feed bars 41 and 41 moves in the approach-separate direction (right and left direction) to open and close by a driving means (not shown) and also moves in the front and rear direction in a synchronized manner. Furthermore, the pair of feed bars 41 and 41 is configured to move in the up-and-down direction in a synchronized manner.
  • each claw 42 is fixed to the feed bar 41 via a claw holder 43.
  • Each pair of claws 42 and 42 is arranged to positions corresponding to the workpiece introducing section 50 and the forming sections 51 and 52 in a state in which the pair of feed bars 41 and 41 is in a retreated position (in a state in which they are in a leftwardly moved position in Fig. 1 ), and arranged to positions corresponding to the forming section 51 and 52 and the work discharging section 53 in a state in which the pair of feed bars 41 and 41 is in a forwardly moved position (in a state in which they are in a rightwardly moved position in Fig. 1 ).
  • each of the workpieces W positioned on the workpiece introducing portion 50 and the forming portions 51 and 52 is sandwiched and held (chucked) by corresponding pair of claws 42 and 42. Furthermore, when the pair of feed bars 41 and 41 is raised and then moved forward (moved to the right side in Fig. 1 ) while keeping the chucking state, these three pairs of claws 42 and 42 are arranged at positions corresponding to the forming section 51 and 52 and the workpiece discharging section 53, respectively.
  • the workpieces W sequentially supplied to the workpiece introducing section 50 are sequentially transferred to the primary forming section 51, the secondary forming section 52, and the workpiece discharging section 53, and then sequentially discharged.
  • each claw 42 of the transfer device 4 has a positioning dented portion 45 having a V-shaped or a U-shaped groove on the inner side middle portion in a plan view.
  • the inner circumferential shape of the positioning dented portion 45 is formed into a trapezoidal shape corresponding to the outer circumferential shape of the positioning protrusion 85 of the aforementioned primary formed member W1.
  • Both the inner side surfaces of the positioning dented portion 45 having a trapezoid shape are formed to be slanted corresponding to both guide portions 86 and 86 of the positioning protrusion 85, and constitute side guide portions 46 and 46.
  • the positioning protrusion 85 of the primary formed member W1 is engaged with the positioning dented portion 45 of one of claws 42 to position the primary formed member W1.
  • the positioning dented portion 45 of the claw 42 constitutes an engaging portion receiving portion.
  • the shape of the positioning protrusion 85 of the primary formed member W1 is formed corresponding to the shape of the positioning dented portion 45 of the claw 42, which utilizes the originally possessed dented portion of the claw 42 as the positioning dented portion 45.
  • the primary forming dies 1 are arranged at the primary forming section 51, and the secondary forming dies 2 are arranged at the secondary forming section 52.
  • the primary forming dies 1 include a lower die 11 and a punch 16 as an upper die.
  • the lower die 11 has an upwardly opened forming cavity 12 for forming the primary formed member W1.
  • the inner circumferential surface of the forming cavity 12 is formed corresponding to the outer circumferential surface shape of the primary formed member W1, except for the top end surface of the primary formed member.
  • dented portions (forming portions) for forming the main body portion 81, the skirt scheduled portions 82, and the pin-boss scheduled portions 83 of the primary formed member W1 are formed on the inner surface of the forming cavity 12.
  • a positioning protrusion forming female die portion 13 having a dented groove shape for forming the positioning protrusion 85 is formed corresponding to the outer surface shape of the positioning protrusion 85.
  • the lower die 11 having the aforementioned structure is installed on the lower plate 10 via a lower die holder 14.
  • the lower side portion of the punch 16 is formed to have a shape capable of being inserted into the forming cavity 12 of the lower die 11 in a fitted manner.
  • a positioning protrusion forming male die portion 17 having a protruded ledge shape is formed corresponding to the positioning protrusion forming female die portion 13 .
  • the punch 16 having the aforementioned structure is installed on the upper plate 20 via a punch holder 18.
  • the upper plate 20 is constituted so as to be moved in the up-and-down direction with a lifting and lowering means (not shown).
  • the punch 18 is fitted into the forming cavity 12 of the lower die 11.
  • the positioning protrusion forming male die portion 17 of the punch 18 is fitted into the female die portion 13 of the lower die 11.
  • knockout pins are provided such that the pins can be moved upward to protrude upward from the bottom surface of the forming cavity.
  • the primary formed member W1 formed in the forming cavity 12 of the lower die 11 is pushed up by the knockout pins and positioned so as to protrude upward from the forming cavity 12 of the lower die 11 by a predetermined amount.
  • the secondary forming dies 2 are equipped with a lower die 21 and a punch 26 as an upper die.
  • the lower die 21 has an upwardly opened forming cavity 22 for forming the secondary formed member W2.
  • the inner circumferential surface of the forming cavity 22 is formed corresponding to the outer circumferential surface shape of the secondary formed member W2 except for the top end surface of the secondary formed member.
  • dented portions (forming portions) for forming the land portion 91, the skirt portions 92, the pin-boss portions 93, and the side wall portions 94 of the secondary formed member W2 are formed on the inner surface of the forming cavity 22 .
  • a positioning protrusion forming female die portion 23 having a dented groove shape is formed corresponding to the outer surface shape of the positioning protrusion 85.
  • the lower die 21 having the aforementioned structure is installed on the lower plate 10 via a lower die holder 24.
  • the lower side portion of the punch 26 is formed to have a shape capable of being inserted into the forming cavity 22 of the lower die 21 in a fitted manner.
  • a positioning protrusion forming male die portion 27 having a protruded ledge shape is formed corresponding to the positioning protrusion forming female die portion 23.
  • the punch 26 having the aforementioned structure is installed on the upper plate 20 via a punch holder 28.
  • the secondary forming punch 26 When the upper plate 20 is lowered, the secondary forming punch 26 is lowered in synchronization with the primary forming punch 16 to be fitted into the forming cavity 22 of the secondary forming dies 2. At the time of this punching operation, the positioning protrusion forming male die portion 27 of the secondary forming punch 26 is fitted into the female die portion 23 of the lower die 21.
  • knockout pins are provided such that the pins can be moved upward to protrude upward from the bottom surface of the forming cavity so that the secondary formed member W2 is pushed up by the knockout pins after the forming and positioned so as to protrude upward from the forming cavity 22 of the lower die 21 by a predetermined amount.
  • conditions for performing the forging processing are as follows. That is, the temperature of the workpiece W is set to 380 to 540 °C, the temperature of the upper die (punch) of each of the primary forming dies 1 and the secondary forming dies 2 is set to 100 to 250 °C, and the temperature of the lower die thereof is set to 150 to 370 °C.
  • the primary forming and the secondary forming are conducted continuously, and therefore it is preferable that the temperature of the workpiece is set to be higher at the primary forming.
  • the workpiece temperature during the primary forming is set to be lower than the solidus temperature of the workpiece W by 30 to 60 °C (i.e., -30 to -60 °C with respect to the solidus temperature of the workpiece W), and the temperature of the workpiece during the secondary forming is set to be lower than the temperature of the workpiece W during the primary forming by 20 to 60 °C (i.e., -20 to -60 °C with respect to the temperature of the workpiece W during the primary forming) by releasing heat to the dies. It is more preferable that the temperature of the workpiece during the secondary forming is set so as not to become 370 °C or lower.
  • a graphite series lubricant can be used as a lubricant for the workpiece W, and the lubricant can be applied by immersion treatment or Bonderizing treatment.
  • a lubricant for the dies a soluble graphite series lubricant or a mixture of oil-based graphite series lubricant and aqueous graphite series lubricant can be used. The lubrication to the dies is conducted during both the primary forming and the secondary forming.
  • the forging operation of the forging device of this embodiment is explained.
  • the primary forming and the secondary forming are conducted in a simultaneous parallel manner, and a plurality of workpieces W are transferred in a simultaneous parallel manner.
  • various operations to be consecutively performed against a forging member W0 will be explained in chronological order.
  • the pair of feed bars 41 and 41 is in an opened state at the retreated position.
  • a forging member W0 is loaded on the introducing conveyer 56 from the outside and transferred to the workpiece introducing section 50.
  • the axis of the forging member W0 is arranged in an up-and-down direction (i.e., vertical direction).
  • the pair of feed bars 41 and 41 is raised and then moved forward so that the forging member W0 sandwiched and held by and between the first pair of claws 42 and 42 is transferred to a position corresponding to the forming cavity 12 of the lower die 11 of the primary forming section 51.
  • the pair of feed bars 41 and 41 is lowered.
  • the upper portion of the forging member W0 is sandwiched and held by and between the pair of claws 42 and 42, while the lower portion thereof is protruded downward. Consequently, when the feed bars 41 and 41 are lowered, the lower portion of the forging member W0 chucked with the pair of claws 42 and 42 is inserted into the upper portion of the forming cavity 12 of the lower die 11.
  • the pair of feed bars 41 and 41 is opened to release the chucking state of the forging member W0, which in turn results in dropping of the forging member W0 in the forming cavity 12 of the lower die 11.
  • the forging member W0 since chucking of the forging member W0 is released in a state in which the lower portion of the forging member W0 is inserted in the forming cavity 12, the forging member W0 can be accurately and assuredly accommodated in the forming cavity 12. This assuredly prevents occurrence of installation defects, such as, e.g., displacement of the forging member W0 at the time of the insertion or abnormal insertion with a posture different from a normal posture. Therefore, the die forming, which will be described, can be conducted smoothly with a high degree of accuracy.
  • the upper portion of the forging member W0 is sandwiched and held by the pair of claws 42 and 42.
  • the lower portion of the forging member W0 if the lower portion of the forging member W0 is sandwiched and held by the pair of claws 42 and 42, the lower portion of the forging member W0 cannot be disposed in a state in which the lower portion is inserted in the forming cavity 12 because the pair of claws 42 and 42 interferes with the lower die 11 when the feed bars 41 and 41 are lowered.
  • the feed bars 41 and 41 are opened, there is a risk that it becomes difficult to drop the forging member W0 into the forming cavity 12 with a high degree of positional accuracy.
  • the upper portion of the forging member W0 is sandwiched and held by the pair of claws 42 and 42. Therefore, when the feed bars 41 and 41 are lowered, the lower portion of the forging member W can be assuredly inserted into the forming cavity 12, and when the feed bars 41 and 41 are opened, the forging member W0 can be assuredly dropped into the forming cavity 12.
  • the upper plate 20 is lowered to punch the punch 16 into the forming cavity 12 of the lower die 11, which causes pressing of the forging member W0 in each dented portion of the forming cavity 12.
  • the forging member W0 is formed into a primary formed member W1.
  • this primary formed member W1 has a positioning protrusion 85 protruded from one side portion of the outer circumferential surface of the main body portion 81 in the radially outward direction.
  • the dotted line shown in Fig. 8 indicates a lowermost position of the punch 16 when the punch 16 is lowered.
  • the upper plate 20 and the punch 16 are raised, and then the primary formed member W1 is pushed up by the knockout pins, so that the upper side portion of the primary formed member W1 is positioned so as to be protruded upward from the forming cavity 12.
  • the pair of feed bars 41 and 41 is taking the retreated initial position.
  • the pair of feed bars 41 and 41 are closed (approached), so that the upper portion of the primary formed member W1 in the primary forming section 51 is sandwiched and held by and between the second pair (the second pair from the left side in Fig. 1 ) of claws 42 and 42 from its both sides.
  • the positioning protrusion 85 formed on the primary formed member W1 is engaged with the positioning dented portion 45 of one of claws 42, thereby positioning the primary formed member W1 with respect to the transfer device 4.
  • the displacement is corrected.
  • the primary formed member W1 is displaced at the time of being sandwiched and held by and between the claws 42 and 42, the outer circumferential angular portion of the positioning protrusion 85 comes into contact with the guide portion 46 of the positioning dented portion 45 to be guided, or the opening edge portion of the positioning dented portion 45 comes into contact with the guide portion 86 of the positioning protrusion 85 to be guided.
  • the primary formed member W1 is corrected in position while being moved slightly.
  • the positioning protrusion 85 is fitted in the positioning dented portion 45.
  • the primary formed member W1 is sandwiched and held by and between the pair of claws 42 and 42 of the transfer device 4.
  • the pair of feed bars 41 and 41 is raised and then moved forward, so that the primary formed member W1 sandwiched and held by and between the second pair of claws 42 and 42 is transferred to a position corresponding to a forming cavity 22 of the lower die 21 arranged at the secondary forming section 52.
  • the pair of feed bars 41 and 41 is lowered, so that the lower portion of the primary formed member W1 held by the claws 42 and 42 is inserted into the upper portion of the forming cavity 22 of the lower die 21. Furthermore, the lower portion of the positioning protrusion 85 of the primary formed member W1 is inserted into the upper portion of the positioning protrusion fitting female die portion 23 of the forming cavity 22.
  • the pair of feed bars 41 and 41 is opened to release the chucking of the primary formed member W1, so that the primary formed member W1 is dropped in the forming cavity 22 with the positioning protrusion 85 fitted in the positioning protrusion fitting female die portion 23 of the forming cavity 22.
  • the primary formed member W1 is dropped with a part of the primary formed member W1 (i.e., the lower portion of the primary formed member) fitted in the forming cavity 22, which enables assured accommodation of the primary formed member W1 in the forming cavity 22 with a high degree of positional accuracy. Furthermore, the primary formed member W1 is dropped in the forming cavity 22 in a state in which a part of the positioning protrusion 85 (lower portion of the positioning protrusion) is fitted in the positioning protrusion fitting female die portion 23 of the forming cavity 22, and therefore the primary formed member W1 can be positioned accurately in the axial rotational direction (i.e., in the circumferential direction). As a result, the primary formed member W1 can be set in the forming cavity 22 of the lower die 21 with a higher degree of positional accuracy.
  • the lower guide portion 87 formed at the lower side of the positioning protrusion 85 comes into contact with the opening edge portion of the positioning protrusion fitting female die portion 23 of the lower die 21 to be guided.
  • the primary formed member W1 is assuredly accommodated in the forming cavity 22 of the lower die 21.
  • the punch 26 is pushed into the forming cavity 22 of the lower die 21 in accordance with the lowering operation of the upper plate 20, whereby the primary formed member W1 is pressed into each dented portion of the forming cavity 22.
  • a secondary formed member W2 is formed.
  • the main body portion 81 is formed into a land portion 91
  • the skirt scheduled portion 82 is formed into a skirt portion 92
  • the pin-boss scheduled portion 83 is formed into a pin-boss portion 93.
  • the positioning protrusion 85 is pressed by and between the positioning protrusion fitting female die portion 23 of the lower die 21 and the positioning protrusion forming male die portion 27 of the punch 26 to be compressed in the axial direction, and formed into a positioning protrusion forming portion remaining 95 short in the axial direction.
  • the dotted line shown in Fig. 9 indicates a lowermost position of the punch 26 when the punch 26 is lowered.
  • the upper plate 20 and the punch 26 are raised, and then the secondary formed member W2 is pushed up by the knockout pins, so that the upper side portion of the secondary formed member W2 is positioned so as to be protruded upward from the forming cavity 22.
  • the pair of feed bars 41 and 41 is taking the retreated initial position.
  • the pair of feed bars 41 and 41 are closed (approached), so that the upper portion of the secondary formed member W2 in the secondary forming section 52 is sandwiched and held by and between the third pair (the third pair from the left side in Fig. 1 ) of claws 42 and 42 from its both sides.
  • the positioning protrusion forming portion remaining 95 is engaged with the positioning dented portion 45 of one of claws 42 in a fitted manner, which enables accurate positioning of the secondary formed product W2.
  • the pair of feed bars 41 and 41 is raised and moved forward, so that the secondary formed product W2 sandwiched and held by and between the third pair of claws 42 and 42 is transferred to a position corresponding to the workpiece discharging section 53.
  • the pair of feed bars 41 and 41 is lowered and then opened to release the chucking of the secondary formed member W2.
  • the secondary formed member W2 is disposed on the workpiece discharging section 53.
  • the secondary formed member W2 disposed on the workpiece discharging section 53 is conveyed to a predetermined place by the discharging conveyer 57. In this way, a series of forging of the workpiece W is completed.
  • the primary forming and the secondary forming are conducted alongside.
  • the workpieces W disposed on the workpiece introducing section 50 and forming sections 51 and 52 are each sandwiched and held simultaneously by the three pairs of claws 42 and 42 of the pair of feed bars 41 and 41, and transferred simultaneously to the forming sections 51 and 52 and workpiece discharging section 53.
  • each of the workpieces arranged at the forming sections 51 and 52, the primary forming and the secondary forming are conducted simultaneously.
  • the workpiece (forging member) is conveyed to the workpiece introducing section 50 by the introducing conveyer 56, and the workpiece (secondary formed member W2) arranged at the workpiece discharging section 53 is discharged by the discharging conveyer 57.
  • the transferring operation of the workpieces W by the pair of feed bars 41 and 41 and the forming operation are repeated alternately.
  • the primary forming and the secondary forming for a plurality of worwkpieces W are conducted in a simultaneous parallel manner, and the secondary formed members (forged products) are discharged sequentially.
  • the forged member W2 manufactured in this way is subjected to cutting processing as needed, the positioning protrusion forming portion remaining 95 and the like are removed.
  • the forged member is formed into a forged product having a final shape.
  • a positioning protrusion 85 is formed on the workpiece W by the primary forming, while the claw 42 is provided with a positioning dented portion 45 corresponding to the positioning protrusion 85. Therefore, at the time of chucking the primary formed member W1 with the claws 42 and 42, the positioning protrusion 85 and the positioning dented portion 45 are engaged with each other, enabling positioning of the primary formed member W1 with a high degree of accuracy, which in turn can transfer the primary formed member W1 to the secondary forming dies 2 with a high degree of accuracy. Therefore, with the secondary forming dies 2, the primary formed member W1 can be subjected to forming while maintaining a normal posture with no displacement, which in turn can assuredly obtain a high quality secondary formed member W2.
  • the positioning protrusion 85 is formed on the workpiece W during the primary forming, which can eliminate a separate process for forming the positioning protrusion. This in turn can prevent the number of processing steps from being increased, which in turn can maintain high productivity.
  • the use of the aforementioned transfer device 4 enables short-time transferring with a constant cycle time.
  • temperature management which is one of important conditions for forging, such as management of the die temperature or management of the workpiece temperature, can be conducted easily and stably. This in turn can attain excellent machining performance, which is effective for forging technology.
  • the use of the transfer device 4 can reduce transfer failures, resulting in stable forging operations. For example, changes in die temperature caused by operation interruptions due to transfer failures can be controlled, enabling easy and stable temperature management described above, which is more effective for forging technology.
  • the center 93x of the pin-boss portion 93 is offset by a predetermined amount ⁇ x toward the thrust side (toward one of the skirt portions) with respect to the center of the piston W2x. Therefore, the piston member W2 is formed with a volume valance in which the volume on the thrust side is slightly larger.
  • the volume balance should be adjusted at the stage of forming the secondary formed member W2 as a final finished product.
  • the positioning protrusion 85 is formed by the primary forming at a position corresponding to the thrust side (one of the skirt portions) of the primary formed member W1, and the positioning protrusion 85 is pressed during the secondary forming to increase the volume on the thrust side.
  • the volume balance can be adjusted accurately.
  • the volume balance is adjusted by adjusting the amount of the protrusion 85 to be pressed during the secondary forming. Therefore, the primary formed member W1 can be manufactured by the primary forming without carefully considering the volume balance, and adjustment of the volume balance can be performed easily, which in turn can further enhance the productivity.
  • the pressing amount of the positioning protrusion 85 is not specifically limited, and can be freely set as needed.
  • the positioning protrusion 85 can be entirely pressed to increase a thickness.
  • the volume balance can also be adjusted by forming a positioning protrusion 85 on a side opposite to a thrust side (anti-thrust side, the other skirt portion side) of the primary formed member W1 and cutting the positioning protrusion 85 after the secondary forming.
  • the volume balance of the primary formed member W1 can be set equal on the thrust side and on the anti-thrust side during the primary forming, which enables easy volume balance adjustment at the time of the primary forming.
  • the positioning protrusion 85 is formed on the skirt portion (thrust side or anti-thrust side), which enables easy adjustment of the volume balance of the forged product W2 by pressing or cutting the protrusion 85.
  • the positioning protrusion 85 it is not always required to form the positioning protrusion 85 on the skirt portion, and the positioning protrusion 85 can be formed on another portion.
  • the protrusion remaining 95 is removed at a following cutting step.
  • this protrusion remaining 95 can be used for positioning the workpiece at the cutting step, which enables smooth cutting operation.
  • Figs. 12A to 12C show a claw 42 of a feed bar 41 of a multistage forging device according to a modified embodiment of the present invention.
  • this device is equipped with a workpiece introducing section, a primary forming section, a secondary forming section, and a workpiece discharging section, and configured to transfer the workpiece therebetween by a transfer device.
  • the transfer device is equipped with a pair of feed bars 41 and 41, and the pair of feed bars 41 and 41 is provided with plural pairs of opposing claws 42 and 42 arranged along the transferring line at predetermine intervals.
  • the pair of claws 42 and 42 are each constituted by a flat board members each having a rectangular shape in a plan view.
  • the opposed surfaces (tip end surfaces) of the pair of claws 42 and 42 are each constituted by a flat surface (vertical surface), and constituted as a positioning portion (engaging portion receiving portion).
  • the workpiece W to be processed by the forging device similar to the aforementioned embodiment, the workpiece W has a cylindrical shape (disk shape).
  • the primary formed member W1 is integrally provided with a circular main body portion 81 and a pair of bin-boss scheduled portions 83 and 83 formed on both sides of one surface side (upper surface side) of the main body portion 81.
  • the pair of pin-boss scheduled portions 83 and 83 are to be formed into the pin-boss portions with secondary forming, and each has a rectangular cubic shape.
  • the outer side surface of the pin-boss scheduled portion 83 and 83 is constituted by a perpendicular surface, and constituted as a positioning portion (engaging portion).
  • a pin-boss portion, a skirt portion, and side wall portions are formed on the upper surface side of the workpiece W.
  • a pin-boss scheduled portion forming dented portions 161 and 161 for forming the pin-boss scheduled portions 83 and 83 are formed on a punch 16 as an upper die.
  • pin-boss portion forming dented portions 261 and 261 for forming the pin-boss portions are formed on the punch 26 as an upper die.
  • the pair of feed bars 41 and 41 are closed (approached).
  • the tip end surfaces of the pair of claws 42 and 42 come into contact with both outside surfaces of the pin-boss scheduled portions 83 and 83 of the primary formed member W1, so that the primary formed member W1 is sandwiched and held by and between the pair of claws 42 and 42.
  • the tip end surfaces of the pair of claws 42 and 42 are constituted by vertical flat surfaces, and the outer side surfaces of the bin-boss scheduled portions 83 and 83 of the primary formed member W1 to which the tip end surfaces of the pair of claws 42 and 42 contact are constituted by a vertical surface.
  • the positioning protrusion 85 is formed on the workpiece W side, and the dented portion 45 is formed on the claw 42 side so as to be engaged with each other.
  • the present invention is not limited to that, and allows to form a positioning dented portion on the workpiece side and a protrusion on the claw side to be engaged with each other for the purpose of positioning.
  • the workpiece is formed at two forming sections, the primary forming section and the secondary forming section.
  • the present invention however, the number of forming sections is not limited two, and can be one or 3 or more.
  • the number of forming sections is not limited two, and can be one or 3 or more.
  • the forging method of the present invention can be applied to forging technology for forging a workpiece to be transferred.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Forging (AREA)
EP09830407.4A 2008-12-03 2009-12-02 Schmiedeverfahren Withdrawn EP2380679A4 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2008308399A JP5373378B2 (ja) 2008-12-03 2008-12-03 鍛造加工方法
PCT/JP2009/070214 WO2010064641A1 (ja) 2008-12-03 2009-12-02 鍛造加工方法

Publications (2)

Publication Number Publication Date
EP2380679A1 true EP2380679A1 (de) 2011-10-26
EP2380679A4 EP2380679A4 (de) 2016-11-23

Family

ID=42233288

Family Applications (1)

Application Number Title Priority Date Filing Date
EP09830407.4A Withdrawn EP2380679A4 (de) 2008-12-03 2009-12-02 Schmiedeverfahren

Country Status (5)

Country Link
EP (1) EP2380679A4 (de)
JP (1) JP5373378B2 (de)
KR (1) KR101335822B1 (de)
CN (1) CN102300653B (de)
WO (1) WO2010064641A1 (de)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US11207897B2 (en) 2018-01-23 2021-12-28 Citizen Watch Co., Ltd. Printing jig and method for manufacturing printed objects

Families Citing this family (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP5497970B2 (ja) * 2012-03-30 2014-05-21 日鍛バルブ株式会社 バルブの鍛造プレス装置
KR20150031842A (ko) * 2013-09-17 2015-03-25 케이.유.티 (주) 부싱바디 제조방법
CN103704955B (zh) * 2013-12-30 2015-12-23 深圳市百泰首饰制造有限公司 一种首饰的加工设备和加工方法
CH712403A1 (de) * 2016-04-28 2017-10-31 Hatebur Umformmaschinen Ag Transportverfahren zum Umsetzen von Werkstücken zwischen mehreren aufeinanderfolgenden Stufen einer Bearbeitungseinrichtung.
CN106378404B (zh) * 2016-11-28 2017-12-26 山西太钢不锈钢股份有限公司 一种gfm1800吨径锻机锻造的方法
CN107186159B (zh) * 2017-06-20 2019-03-12 江苏威鹰机械有限公司 涡旋式无油真空泵铝合金静盘制造工艺
CN110227782A (zh) * 2019-06-28 2019-09-13 徐州鑫旭机械制造有限公司 一种用于锻件生产连续近终成型设备
CN112247064A (zh) * 2020-09-18 2021-01-22 江苏太平洋精锻科技股份有限公司 一种长柄锥齿轮自动化精整系统和方法
CN112935180B (zh) * 2021-01-20 2022-10-04 浙江洪扬汽车零部件有限公司 一种高速螺母成型机
CN114393162B (zh) * 2022-01-20 2023-08-25 安庆汇通汽车部件股份有限公司 一种稳定杆成型用工件自动上下料和传送系统

Family Cites Families (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS51736B1 (de) * 1970-12-17 1976-01-10
DE3129482A1 (de) * 1981-07-25 1983-02-10 Eumuco Aktiengesellschaft für Maschinenbau, 5090 Leverkusen Verfahren und vorrichtung zum durchfuehren des selbsttaetigen werkstuecktransportes bei gesenkschmiedepressen und dergleichen
JPH0620570B2 (ja) * 1986-11-19 1994-03-23 本田技研工業株式会社 ピストンの鍛造方法
JPS63281737A (ja) 1987-05-13 1988-11-18 Matsuo Seisakusho:Kk トランスファ−プレスを利用するステンレス製部品の冷間鍛造加工方法
JP2761124B2 (ja) * 1991-06-25 1998-06-04 日産自動車株式会社 クランクシャフトの鍛造装置
JP2838624B2 (ja) * 1992-08-13 1998-12-16 三菱自動車工業株式会社 ワークの潰し工程を要する部品の鍛造プレス装置
JP3780874B2 (ja) * 2001-05-15 2006-05-31 日産自動車株式会社 多工程鍛造方法および多工程鍛造装置
JP2003035198A (ja) * 2001-07-23 2003-02-07 Showa Denko Kk 内燃機関用ピストンおよびその製造方法
JP3789378B2 (ja) * 2002-03-27 2006-06-21 株式会社栗本鐵工所 トランスファ装置用クランプ機構
JP2004027922A (ja) * 2002-06-25 2004-01-29 Showa Denko Kk 内燃機関用鍛造ピストン、その素材およびそれらの製造方法
JP2005219097A (ja) * 2004-02-05 2005-08-18 Daido Machinery Ltd 多段式圧造成形機
JP4692237B2 (ja) 2005-11-14 2011-06-01 日産自動車株式会社 多段鍛造装置におけるワーク搬送用フィンガの位置調整装置および位置調整方法

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO2010064641A1 *

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US11207897B2 (en) 2018-01-23 2021-12-28 Citizen Watch Co., Ltd. Printing jig and method for manufacturing printed objects

Also Published As

Publication number Publication date
JP2010131613A (ja) 2010-06-17
CN102300653B (zh) 2014-03-19
KR101335822B1 (ko) 2013-12-03
EP2380679A4 (de) 2016-11-23
CN102300653A (zh) 2011-12-28
WO2010064641A1 (ja) 2010-06-10
JP5373378B2 (ja) 2013-12-18
KR20110084284A (ko) 2011-07-21

Similar Documents

Publication Publication Date Title
EP2380679A1 (de) Schmiedeverfahren
JP2010131613A5 (de)
US8627565B2 (en) Method for producing crankshaft and production apparatus therefor
KR101523863B1 (ko) 단조 장치, 단조 제품의 제조 방법, 및 단조 방법
US10464121B2 (en) Dual forging system and method
EP3450046B1 (de) Verfahren zur herstellung eines zylindrischen ringelements, lager, kupplung, fahrzeug und maschine
US20080110308A1 (en) Punch working apparatus and method
US7975749B2 (en) Method of removing excess metal from casting with press, and cutter used therefore
US20190224740A1 (en) Forging device
EP2583769B1 (de) Vorrichtung und Verfahren zum Warmformen/Presshärten und Schneiden eines Blechmaterials in einem Werkzeug, mit automatisierter Entnahme des Blechabfalls
EP2789411A1 (de) Verfahren zur Herstellung eines Pistolenpatronengehäuses sowie Transferpresse zur Durchführung des Verfahrens
JP4989167B2 (ja) ギヤの製造方法およびギヤの製造装置
CN111112531A (zh) 一种可用于自动化生产斜滚道内星轮模具
JP2020163419A (ja) エレメントの製造装置および製造方法
JP3420467B2 (ja) ロッカーアームの製造方法
JP3212267B2 (ja) 凹状部品の製造方法及びその製造装置
JP4885893B2 (ja) 段部付きシャフトの製造方法及びアーマチャシャフトの製造方法、並びに段部付きシャフトの成型装置
US9566641B2 (en) Forging apparatus
JP2020163439A (ja) エレメントの製造方法および製造装置
CN211915363U (zh) 一种可用于自动化生产斜滚道内星轮模具
JP4069254B2 (ja) 圧造成形機
CN104550605B (zh) 锻造装置
RU2167736C2 (ru) Способ штамповки осесимметричных заготовок и устройство для его осуществления
Yun et al. A study of Double Sheet Multi-forming Equipment
JP2016013559A (ja) ダイス、該ダイスを備えるプレス金型、プレス装置、及び該ダイスを用いて加工された成形品

Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

17P Request for examination filed

Effective date: 20110617

AK Designated contracting states

Kind code of ref document: A1

Designated state(s): AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO SE SI SK SM TR

DAX Request for extension of the european patent (deleted)
RA4 Supplementary search report drawn up and despatched (corrected)

Effective date: 20161021

RIC1 Information provided on ipc code assigned before grant

Ipc: B21K 27/00 20060101AFI20161014BHEP

Ipc: B21J 5/00 20060101ALI20161014BHEP

Ipc: B21D 43/05 20060101ALI20161014BHEP

Ipc: B30B 13/00 20060101ALI20161014BHEP

17Q First examination report despatched

Effective date: 20161115

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: THE APPLICATION HAS BEEN WITHDRAWN

17Q First examination report despatched

Effective date: 20161115

18W Application withdrawn

Effective date: 20170301