US3762201A - Plug changing mechanism for rolling mills, and plugs for the same - Google Patents

Plug changing mechanism for rolling mills, and plugs for the same Download PDF

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Publication number
US3762201A
US3762201A US00220957A US3762201DA US3762201A US 3762201 A US3762201 A US 3762201A US 00220957 A US00220957 A US 00220957A US 3762201D A US3762201D A US 3762201DA US 3762201 A US3762201 A US 3762201A
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US
United States
Prior art keywords
plug
tube
drum
rolls
plugs
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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.)
Expired - Lifetime
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US00220957A
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English (en)
Inventor
A Philipps
W Schonfeld
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.)
Vodafone GmbH
Original Assignee
Mannesmannroehren Werke AG
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Publication date
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Publication of US3762201A publication Critical patent/US3762201A/en
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Expired - Lifetime legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B25/00—Mandrels for metal tube rolling mills, e.g. mandrels of the types used in the methods covered by group B21B17/00; Accessories or auxiliary means therefor ; Construction of, or alloys for, mandrels or plugs
    • B21B25/06—Interchanging mandrels, fixing plugs on mandrel rods or cooling during interchanging mandrels
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B25/00—Mandrels for metal tube rolling mills, e.g. mandrels of the types used in the methods covered by group B21B17/00; Accessories or auxiliary means therefor ; Construction of, or alloys for, mandrels or plugs

Definitions

  • Plugs are carried in peripheral pockets formed in a drum and the latter is disposed for rotation through an opening in the tube entry trough so that its pockets may be selectively aligned with the trough.
  • the tube As the tube is transferred in a direction toward the reducing rolls, it moves through the pocket aligned with the trough and its forward end engages the plug in such pocket and moves the plug to engagement with the mandrel bar for disposition between the work rolls.
  • the tube is then rolled over the plug and upon completion'of the rolling operation, the tube clears the plug and the latter falls to a chute and is delivered to a lower pocket of the rotatable drum.
  • the drum is then rotated to position another plug in alignment with the entry trough for a subsequent rolling operation.
  • the invention also relates to improved plugs and in one aspect includes a two part plug, the parts being mounted on connecting rods with resilient means therebetween.
  • the improved plug is formed as a one-piece hollow member to reduce weight, the member being symetrical about a center portion so that either end may be pointed in rolling direction.
  • the invention relates to a mechanism for mechanically changing plugs used in a rolling mill for decreasing the wall thickness of metal tubes or shells.
  • Types of such mechanism are known, and consist of tongs, troughs and continuous bands by means of which the plugs are carried to the mill stand.
  • the known mechanism has not been found satisfactory and therefore in many instances the tools are changed manually.
  • Our invention reduces the time required in positioning and aligning plugs in a tube mill and in changing the plugs following a rolling operation. Our invention also improves the useful life of the plugs and reduces the labor involved and the danger of accidents.
  • our invention provides for the automatic delivery of a plug to the tube entry trough of a rolling mill, so that the forward end of the advancing tube may move the plug to proper position between the mill rolls and to connection with the mandrel bar.
  • the plug is automatically disengaged from the mandrel bar and is delivered to a predetermined one of a plurality of peripheral pockets in a rotatable drum, for subsequent disposal in the tube entry trough, or for replacement.
  • Our invention also provides an improved plug which has an increased useful life and which greatly improves the technology of rolling.
  • FIG. 1 is a representation of the plug changing mechanism of a rolling mill, illustrating our invention
  • FIG. 2 is a sectional view generally corresponding to the line B of FIG. 1,
  • FIG. 3 is a fragmentary, enlarged, sectional view of our improved plug
  • FIG. 4 is a sectional view generally corresponding to the line A of FIG. 3, and
  • FIG. 5 is an enlarged sectional view of a plug, showing another embodiment.
  • an entry trough consisting of parts 7 and 8 separated by an opening or cut-out 9.
  • a conical drum 10 is so disposed that an upper portion fits within the opening 9 and the drum is rotatable about an axis 16 which is inclined with respect to the trough portions 7,8.
  • the drum has longitudinal cut-outs, or pockets, ll, 12, 13 and 14,
  • a sloped chute 15 is located beneath the trough portion 7.
  • the conical drum 10 is rotated about its axis 16 in any suitable manner, so that the pockets 11,12, 13 and 14 may be located in sequence in the space 9. To do this, the drum is rotated in the direction of the arrow 17 shown in FIG. 2. It will be noted that the radial surface of drum 10 is higher than the pass line and the bottom wall of the uppermost pocket 11 is in line with the trough portions 7 and 8.
  • the part of the drum 10 on its upwardly turning section is enclosed by a fixed cage 18. As seen at 19, the cage 18 covers the back flat surface of the drum l0 and a cover plate 20 is provided in the back 19 which may be opened to remove a plug from the drum. Behind the opening covered by the plate 20 is a chute 21.
  • a tube or hollow shell is placed on the trough portion 8 at the location designated by the arrow 22.
  • the pocket or longitudinal opening 11 of the conical drum 10 is at its top position (12 oclock) in alignment with the trough portions 7 and 8, and a plug 4 is located in the opening 11.
  • the tube to be rolled is transferred forward in trough 8 in the direction indicated by the arrow 23 and thus will move through the drum opening 10 and trough portion 7 to the mill rolls 1 and 2.
  • the plug 4 is held by the plug bar 6 between the mill rolls 1 and 2.
  • the mill rolls drive the tube 3 forwardly, resulting in reduction of the thickness of the tube wall in conventional manner.
  • the trailing end of the tube is beyond the plug 4 and the latter will fall out of its position between the rolls 1 and 2 and onto the chute 15, but the plug bar 6 will support the rolled tube for discharge from the mill.
  • the lowermost pocket or cut-out 13 (in the position of parts shown in FIG. 1) will receive the plug 4 from the chute l5, and the cage 18 will prevent the plug from falling out of the pocket.
  • the conical drum 10 will then be rotated in the direction of the arrow 17 so that the second plug 25 is moved to alignment with the chute portions 7, 8, and the plug 4 will occupy the position formerly occupied by the plug 25.
  • the pocket 14 will in this condition be lowermost in position to receive a plug from a subsequent rolling operation. It will be appreciated that a pocket or longitudinal cut-out of the drum always faces the opening closed by the door 20 so that the latter may be opened and a plug removed from the drum and a replacement plug inserted therefor.
  • plugs herein disclosed To assure trouble-free operation of the plug changing mechanism it has been found preferable to use plugs herein disclosed.
  • Such plug includes a part 4 of the shape of a frustrum of a cone with a cylindrical section and a radius 26 from the outside diameter surface 27 to the back surface 28.
  • the guiding section 24 is similar to the section 4, and its diameter is the same size or a small amount larger than the inside diameter of the tubes or shell to be rolled.
  • the outside diameter of the part 4 corresponds to the desired inside diameter of the tube after rolling.
  • Plug parts 4 and 24 have respective central bores or openings 29,30, through which passes a tension rod 31 having threads at its opposite ends.
  • Special nuts 33, 34 are threaded on respective ends of the rod 31 and resilient means, such as a pack of Bellville springs 32, is disposed between the plug parts 4 and 24 and normally urge such parts away from each other.
  • the nut 34 is formed with flat surfaces 36,37 to receive the jaws of a wrench for the purpose of tightening the nut.
  • a spacer ring 35 is disposed between the plug part 24 and the nut 34, and this ring has oppositely disposed flat surfaces 39 and 40, as seen in FIG. 4.
  • the spacer ring has a key 38 which engages in a key slot on the rod to prevent relative rotation, so that a wrench may be applied to the flats 39,40, to prevent relative rotation when the nut 34 is tightened.
  • a wrench may be applied to the flats 39,40, to prevent relative rotation when the nut 34 is tightened.
  • FIG. illustrates a longitudinal cross-section through a one-piece plug whose shape consists of end sections 41,42 and an integral center section 43.
  • the plug is tapered at both ends, as shown, to provide the respective conical surfaces 44,45.
  • the end sections 41,42, at their points of greatest thickness have the same diameter as the central cylindrical section 43.
  • the plug of this embodiment is cast from a heat resistant material and is hollow, as seen at 46,47 and 48 to decrease its weight. It will be appreciated that the plug is symetrical with respect to the central portion 43 and therefore is usable on both sides thereof or in either direction.
  • the tube to be rolled pushes the plug from left to right (as viewed in FIG. 5) until the conical surface 45 rests against the mandrel bar 6;
  • the section 42 is located under the mill rolls 1, 2 and therefore the tube has to be pushed by a pusher from the left of FIG. 5 completely over the section 41 and the central portion 43 until the rolls grip the tube and roll it over the plug.
  • the mandrel bar 6 is retracted in a direction away from the mill rolls so that the plug section 41 is located under the rolls 1, 2, and the plug is guided by section 42 disposed within the tube being rolled.
  • the tube pusher is not required and may be omitted, unless it is provided for other reasons.
  • the two methods above described may be applied in combination, so that during rolling, the plug is pushed forward so far that at the beginning the section 41 .is located under the rolls and at the finish of rolling the section 42 is under the rolls. Suitable devices for pushing the plug forward are known.
  • section 41 or section 42 points in the roll direction. Therefore, when disposing the plug into the entry trough, its position does not have to be watched.
  • the plug shown in FIG. 5 may have its sections 41,42 and 43 formed as separate parts, and such parts may be held assembled on a tension rod, such as the rod 31, with nuts of the type heretofore shown at 33 threaded on opposite ends of the rod.
  • the nuts are suggested in FIG. 5 as those parts disposed outwardly of the dotted lines.
  • the nuts will have opposite flat surfaces, such as previously shown at 36,37 on the nut 34,
  • springs may be interposed between either, or both nuts, and the adjoining parts of sections 41 and 42.
  • plug changing mechanism including:
  • said drum being rotatable to position a pocket and a plug therein uppermost and in alignment with the pass line of the mill, whereby said plug may be transfered along the pass line to said mandrel bar,
  • each of said plugs having opposite end surfaces, one end surface being contoured to fit with the leading end of said tube and the opposite end surface being contoured to fit with the free end of said mandrel bar, whereby when a plug is in the uppermost drum pocket, transfer of said tube toward said mill rolls will cause the leading end of said tube to engage said one end surface of said plug and move the latter along the pass line until said opposite end surface of said plug engages said free end of said mandrel bar.
  • each plug portion is in the shape of a frustrum of a cone with an axial bore to slidably fit on said tension rod, opposite ends of said rod being threaded, and nuts threaded on respective ends to hold said plug portions assembled with said rod.
  • plug changing mechanism including:
  • said drum being rotatable to position a pocket and a plug therein uppermost and in alignment with the pass line of the mill, whereby said plug may be transfered along said pass line to said mandrel bar,
  • each of said plugs having a cylindrical center section and guiding and working sections extending and tapering off from respective ends of said center section,
  • said guiding section being adapted for engagement with the leading end of said tube and said working section being adapted for engagement with the free end of said mandrel bar, whereby when a plug is in the uppermost drum pocket, transfer of said tube toward said mill rolls will cause the leading end of said tube to engage said guiding section of said plug and move the latter along the pass line until said working section of said plug engages said free end of said mandrel bar.
  • tension rod has its opposite ends threaded, and said heads are formed by cone-shaped nuts threaded on respective rod ends.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Shaping Of Tube Ends By Bending Or Straightening (AREA)
  • Reduction Rolling/Reduction Stand/Operation Of Reduction Machine (AREA)
  • Crushing And Grinding (AREA)
US00220957A 1971-12-17 1972-01-26 Plug changing mechanism for rolling mills, and plugs for the same Expired - Lifetime US3762201A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE2163818A DE2163818A1 (de) 1971-12-17 1971-12-17 Stopfen fuer rohrwalzwerk
DE7148215 1971-12-17

Publications (1)

Publication Number Publication Date
US3762201A true US3762201A (en) 1973-10-02

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ID=25762205

Family Applications (1)

Application Number Title Priority Date Filing Date
US00220957A Expired - Lifetime US3762201A (en) 1971-12-17 1972-01-26 Plug changing mechanism for rolling mills, and plugs for the same

Country Status (6)

Country Link
US (1) US3762201A (enrdf_load_stackoverflow)
JP (1) JPS4867164A (enrdf_load_stackoverflow)
DE (1) DE2163818A1 (enrdf_load_stackoverflow)
FR (1) FR2163771B1 (enrdf_load_stackoverflow)
GB (2) GB1418688A (enrdf_load_stackoverflow)
IT (1) IT971762B (enrdf_load_stackoverflow)

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
USB382798I5 (enrdf_load_stackoverflow) * 1972-08-02 1975-01-28
US3955392A (en) * 1974-01-10 1976-05-11 Vallourec Usines A Tubes De Lorraine-Escaut Et Vallourec Reunies Device for changing mandrels in tube rolling mills
US4015460A (en) * 1976-01-09 1977-04-05 Damascus Steel Casting Company Rolling mill plug assembly
US4022043A (en) * 1974-04-05 1977-05-10 Valti Societe Anonyme Pour La Fabrication De Tubes Roulements Plug changing mechanism for use in piercing mills
US4028923A (en) * 1976-05-04 1977-06-14 Aetna-Standard Engineering Company Plug and shoe changing in piercing and reeling mills
US4031738A (en) * 1974-08-22 1977-06-28 Mannesmannrohren-Werke Ag. Plug for plug rolling
US4115958A (en) * 1977-02-18 1978-09-26 The Warner & Swasey Company Method of cylindrical and shoulder grinding
US4149396A (en) * 1976-11-16 1979-04-17 Wean United, Inc. Mandrel holding and releasing means
US5829296A (en) * 1994-08-25 1998-11-03 Mannesmann Aktiengesellschaft Method and device for placing plugs on a plug mill

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2338093A1 (fr) * 1976-01-19 1977-08-12 Vallourec Nouveau laminoir de fabrication de tubes sans soudure et installation de fabrication de tubes sans soudure comportant un tel laminoir

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US529910A (en) * 1894-11-27 Apparatus for the manufacture of tubing
US769709A (en) * 1901-04-03 1904-09-13 Nat Tube Co Tube-rolling mill.
US1537206A (en) * 1923-03-17 1925-05-12 Malcolm U Wikstrom Tube-rolling method and apparatus
US1931571A (en) * 1931-08-04 1933-10-24 Frank J Burns Plug bar for seamless tube mills
US1997997A (en) * 1933-03-03 1935-04-16 Diescher Tube Mills Inc Mandrel for tube rolling mills
US2635492A (en) * 1946-03-20 1953-04-21 Martin S Gettig Plug-handling mechanism for seamless tube mills
US3277687A (en) * 1963-09-09 1966-10-11 Gen Mills Inc Plug handling apparatus for seamless tube mill

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
BE715196A (enrdf_load_stackoverflow) * 1967-05-18 1968-09-30

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US529910A (en) * 1894-11-27 Apparatus for the manufacture of tubing
US769709A (en) * 1901-04-03 1904-09-13 Nat Tube Co Tube-rolling mill.
US1537206A (en) * 1923-03-17 1925-05-12 Malcolm U Wikstrom Tube-rolling method and apparatus
US1931571A (en) * 1931-08-04 1933-10-24 Frank J Burns Plug bar for seamless tube mills
US1997997A (en) * 1933-03-03 1935-04-16 Diescher Tube Mills Inc Mandrel for tube rolling mills
US2635492A (en) * 1946-03-20 1953-04-21 Martin S Gettig Plug-handling mechanism for seamless tube mills
US3277687A (en) * 1963-09-09 1966-10-11 Gen Mills Inc Plug handling apparatus for seamless tube mill

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
USB382798I5 (enrdf_load_stackoverflow) * 1972-08-02 1975-01-28
US3924435A (en) * 1972-08-02 1975-12-09 Algoma Steel Corp Ltd Device for inserting plugs in a plug mill
US3955392A (en) * 1974-01-10 1976-05-11 Vallourec Usines A Tubes De Lorraine-Escaut Et Vallourec Reunies Device for changing mandrels in tube rolling mills
US4022043A (en) * 1974-04-05 1977-05-10 Valti Societe Anonyme Pour La Fabrication De Tubes Roulements Plug changing mechanism for use in piercing mills
US4031738A (en) * 1974-08-22 1977-06-28 Mannesmannrohren-Werke Ag. Plug for plug rolling
US4015460A (en) * 1976-01-09 1977-04-05 Damascus Steel Casting Company Rolling mill plug assembly
US4028923A (en) * 1976-05-04 1977-06-14 Aetna-Standard Engineering Company Plug and shoe changing in piercing and reeling mills
US4149396A (en) * 1976-11-16 1979-04-17 Wean United, Inc. Mandrel holding and releasing means
US4115958A (en) * 1977-02-18 1978-09-26 The Warner & Swasey Company Method of cylindrical and shoulder grinding
US5829296A (en) * 1994-08-25 1998-11-03 Mannesmann Aktiengesellschaft Method and device for placing plugs on a plug mill

Also Published As

Publication number Publication date
GB1418688A (en) 1975-12-24
IT971762B (it) 1974-05-10
JPS4867164A (enrdf_load_stackoverflow) 1973-09-13
GB1418687A (en) 1975-12-24
FR2163771A1 (enrdf_load_stackoverflow) 1973-07-27
DE2163818A1 (de) 1973-06-20
FR2163771B1 (enrdf_load_stackoverflow) 1975-06-20

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