US3695079A - Means for forging large shell rings e. g. for boiler shells - Google Patents

Means for forging large shell rings e. g. for boiler shells Download PDF

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Publication number
US3695079A
US3695079A US148079A US3695079DA US3695079A US 3695079 A US3695079 A US 3695079A US 148079 A US148079 A US 148079A US 3695079D A US3695079D A US 3695079DA US 3695079 A US3695079 A US 3695079A
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United States
Prior art keywords
forging
mandrel
ring
bearer
tool
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Expired - Lifetime
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US148079A
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English (en)
Inventor
Willy Muller
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Schloemann AG
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Schloemann AG
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Publication date
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21J—FORGING; HAMMERING; PRESSING METAL; RIVETING; FORGE FURNACES
    • B21J9/00—Forging presses
    • B21J9/02—Special design or construction
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21J—FORGING; HAMMERING; PRESSING METAL; RIVETING; FORGE FURNACES
    • B21J7/00—Hammers; Forging machines with hammers or die jaws acting by impact
    • B21J7/02—Special design or construction
    • 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
    • B21K1/76—Making machine elements elements not mentioned in one of the preceding groups
    • B21K1/761—Making machine elements elements not mentioned in one of the preceding groups rings

Definitions

  • German published Specification Pat. No. 1,171,245 describes the forging of a flat workpiece with two forging beams symmetrically driven by means of a crank or eccentric drive, the beams having forging surfaces of arcuate curvature.
  • This invention is particularly concerned with forging shell rings having dimensions of say from 5 to meters diameter and an axial length of say about 4 meters, weighing say up to about 200 tons each, for the construction of large containers such as boilers.
  • the forging should be effected in a press which must permit easy manipulation and enables one to work with relatively small press forces.
  • the largest of the ring sizes mentioned above could not hitherto be produced with conventional presses because the clearances of the presses are too small.
  • the present invention provides apparatus for forging large shell rings including:
  • a forging tool (preferably in the form of a generally vertical beam) movable relative thereto, the forging tool having a generally vertical, arcuate forging surface facing the mandrel;
  • pivot means connecting the respective pressure fluid devices to the forging tool.
  • the ring In operating the apparatus of the invention, the ring lies horizontally, and is continuously forged throughout its height.
  • the indexing (rotating the ring) is preferably effected with indexing means including means for displacing the ring in a direction at an obtuse angle to the forging direction and simultaneously moving the inside of the ring away from the mandrel.
  • indexing means including means for displacing the ring in a direction at an obtuse angle to the forging direction and simultaneously moving the inside of the ring away from the mandrel.
  • the indexing means preferably includes means for applying a force to the ring to assist the centering, restoring moment applied to the ring by the mandrel and the forging tool when the tool is advanced
  • assisting means may be in the form of an auxiliary pressure fluid ram; the assisting means may also be used when the material of the ring is still soft.
  • the forging tool which would have a forging surface in the form of an arc of a circle
  • the center being movable up and down.
  • a more advantageous and space-saving arrangement is as follows.
  • the devices may be rockably supported.
  • the device preferably further comprises a bearer extending generally parallel to the mandrel, said pressure fluid devices being mounted on the bearer, and means interconnecting the bearer and the mandrel to form a frame which can be opened for insertion or removal of the shell ring.
  • FIG. 1 is a side view of forging apparatus in ac cordance with the invention.
  • FIG. 2 is a plan view of the apparatus, showing indexing means for indexing a ring during a forging operation.
  • a vertical, circular crosssection mandrel 2 projects through a horizontal boiler shell ring 1 which is to be forged; the mandrel 2 forms one limb of a U-shaped structure having a lower connecting bearer 3.
  • An upright forging tool in the form of a forging beam 4 has its lower end pivoted to a sliding shoe 5 which slides on the connecting bearer 3 and can be removed by lifting it vertically upwards.
  • the forging beam 4 has a forging surface 6 in the shape of an arc of a circle, which presses the ring 1 against the mandrel 2.
  • the second limb of the U-shaped structure is a bearer 7, on which are fixed, one above the other, two horizontal piston-and-cylinder ram devices 8 and 9.
  • Each of the piston rods of the ram devices 8, 9 moves rectilinearly and is pivotally connected, by means of a power-transmitting hinged bearing 10, to an intermediate rod 11, which in its turn is pivotally connected by means of a power-transmitting hinged bearing 12 to the forging beam 4.
  • the upper ends of the bearer 7 and of the mandrel 2 are held together by means of a strut 13 which is pivoted to the bearer 7 and engages a spigot 2a on the mandrel.
  • the ram devices 8 and 9 are operated hydraulically, the admission pipes for the forging stroke and for the return stroke leading by way of controlling devices 14 and 15 respectively to a source 16 of hydraulic pressure.
  • the admission and discharge of hydraulic medium into and out of the cylinders of the ram devices 8 and 9 are so controlled that the curved forging surface 6 of the forging beam 4 produces a vertical surface on the ring 1.
  • the advancing piston must here execute a decelerating movement, in which it proceeds, when forging in an upward direction, at first comparatively quickly and then more slowly.
  • the rate of discharge of hydraulic medium from the other cylinder is exactly the same as the rate of supply of hydraulic medium to the cylinder of the advancing piston.
  • For any radius of curvature of the forging surface of the forging beam there is always a predetermined, unchanging program for the controlling devices 14 and 15. The amounts of flow are adjusted during the forging stroke; adjustment is possible because each forging stroke lasts several seconds.
  • FIG. 2 shows an indexing device for the ring 1 which is located between the mandrel 2 and the forging beam 4.
  • the indexing device has hydraulic transporting means (shown as a ram 17) by means of which the ring 1 is displaceable at an obtuse angle to the direction of forging; this angle is at least more than 90.
  • a ram 17 Opposite to the hydraulic transporting ram 17 is provided an auxiliary cylinder 18, which is co-axial with the hydraulic transporting ram 17 and presses its plunger piston against the ring 1.
  • the subsequent centering, restoring moment which is applied to the ring 1 by'means of the mandrel 2 and the moving forging beam 4 is reinforced (assisted) by the force produced by the auxiliary cylinder 18.
  • the forging beam 4 is first of all retracted by means of the two ram devices 8 and 9. Then the hydraulic transporting ram 17 pushes the ring so that its inner side is moved away from the mandrel 2. Then the ring 1 is pushed against the mandrel 2 by the forging beam (which is initially inclined towards the right with respect to the ring 1 in FIG. 2), and clamped, the transporting ram 17 being meanwhile withdrawn.
  • Apparatus for forging large shell rings comprising:
  • the forging tool movable relative thereto, the forging tool having a generally vertical, arcuate forging surface facing the mandrel;
  • At least two pressure fluid devices arranged one above the other, for producing vertical rolling of the arcuate forging surface during forging; and power-transmitting pivot means connecting the respective pressure fluid devices to the forging tool.
  • indexing means further comprises means for applying a force to the ring to assist the centering, restoring moment applied to the ring by the mandrel and the forging tool when the tool is advanced.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Forging (AREA)
US148079A 1970-05-30 1971-05-28 Means for forging large shell rings e. g. for boiler shells Expired - Lifetime US3695079A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE19702026637 DE2026637A1 (de) 1970-05-30 1970-05-30 Vorrichtung zum Schmieden von Ringen für große Kesselschüsse

Publications (1)

Publication Number Publication Date
US3695079A true US3695079A (en) 1972-10-03

Family

ID=5772614

Family Applications (1)

Application Number Title Priority Date Filing Date
US148079A Expired - Lifetime US3695079A (en) 1970-05-30 1971-05-28 Means for forging large shell rings e. g. for boiler shells

Country Status (5)

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US (1) US3695079A (enExample)
JP (1) JPS5134379B1 (enExample)
DE (1) DE2026637A1 (enExample)
FR (1) FR2090391B1 (enExample)
GB (1) GB1334948A (enExample)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8245550B2 (en) * 2011-01-07 2012-08-21 Samuel P Willits Apparatus for providing a rolling action of a curved tool along a flat stationary substrate
CN109967681A (zh) * 2019-04-01 2019-07-05 江阴市劲松科技有限公司 一种锻造设备
CN115338364A (zh) * 2022-09-19 2022-11-15 上海电机学院 超大重载高温弧形送料锻造装置

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH07100209B2 (ja) * 1991-07-22 1995-11-01 株式会社日本製鋼所 大口径リングの鍛造装置
DE102006023721B3 (de) * 2006-05-19 2007-08-02 Wepuko Hydraulik Gmbh Schmiedevorrichtung
RU2568403C2 (ru) * 2014-04-03 2015-11-20 Открытое акционерное общество "Уральский завод тяжелого машиностроения" Ковочно-раскатный агрегат для изготовления колец большого диаметра
RU2592710C2 (ru) * 2014-11-27 2016-07-27 Открытое акционерное общество "Уральский завод тяжелого машиностроения" (ОАО "Уралмашзавод") Ковочный агрегат для изготовления колец большого диаметра
CN112024804A (zh) * 2020-08-17 2020-12-04 付三平 一种可调式半自动铁锅锻打装置

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1348013A (en) * 1919-10-11 1920-07-27 John J Larkin Method of making casing-shoes, &c.
US1996181A (en) * 1930-11-01 1935-04-02 Justin F Wait Process of forming castings
US3625041A (en) * 1968-10-02 1971-12-07 Rheinstahl Wagner Werkzeugmasc Rolling mill for producing annular shapes

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1348013A (en) * 1919-10-11 1920-07-27 John J Larkin Method of making casing-shoes, &c.
US1996181A (en) * 1930-11-01 1935-04-02 Justin F Wait Process of forming castings
US3625041A (en) * 1968-10-02 1971-12-07 Rheinstahl Wagner Werkzeugmasc Rolling mill for producing annular shapes

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8245550B2 (en) * 2011-01-07 2012-08-21 Samuel P Willits Apparatus for providing a rolling action of a curved tool along a flat stationary substrate
CN109967681A (zh) * 2019-04-01 2019-07-05 江阴市劲松科技有限公司 一种锻造设备
CN109967681B (zh) * 2019-04-01 2024-03-19 江阴市劲松科技有限公司 一种锻造设备
CN115338364A (zh) * 2022-09-19 2022-11-15 上海电机学院 超大重载高温弧形送料锻造装置

Also Published As

Publication number Publication date
DE2026637A1 (de) 1971-12-09
FR2090391B1 (enExample) 1974-03-08
JPS5134379B1 (enExample) 1976-09-25
GB1334948A (en) 1973-10-24
FR2090391A1 (enExample) 1972-01-14

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