US3733871A - Method of ejecting plug for rolling mill and an apparatus therefor - Google Patents

Method of ejecting plug for rolling mill and an apparatus therefor Download PDF

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Publication number
US3733871A
US3733871A US00137143A US3733871DA US3733871A US 3733871 A US3733871 A US 3733871A US 00137143 A US00137143 A US 00137143A US 3733871D A US3733871D A US 3733871DA US 3733871 A US3733871 A US 3733871A
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United States
Prior art keywords
plug
mandrel
slidable
disposed
rolling
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.)
Expired - Lifetime
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US00137143A
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English (en)
Inventor
H Nagai
M Shirohama
K Matsumoto
H Kamimura
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.)
JFE Engineering Corp
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Nippon Kokan Ltd
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Filing date
Publication date
Application filed by Nippon Kokan Ltd filed Critical Nippon Kokan Ltd
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Publication of US3733871A publication Critical patent/US3733871A/en
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    • 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

Definitions

  • the invention is to pneumatically eject a plug on the end of mandrel after completing steel rolling, thereby to improve the plug treating operation.
  • This invention relates to a method of ejecting plugs formed in a steel pipe rolling mill and an apparatus therefor.
  • the invention improves the plug ejecting operation.
  • a mandrel bar equipped with plug at one of its ends is located within a steel pipes, and the plug is held between rolling rolls.
  • the plug In such a rolling mill, however, the plug must be placed on or removed from the mandrel bar one at a time.
  • the placing and removing operations are generally done by human operator.
  • a plug which is set on the end point of mandrel bar is removed to be subsequently exchanged with another. Since this plug is highly heated during the rolling operation, it cannot be directly handled by hand.
  • a special clipping tool is used.
  • the plugs weight is substantially, some being SOKg or more.
  • the plugs shape is circular cylindrical. Thus, even though it is held by a special clipping tool, a high degree of operating skill is required for this type of operation.
  • the object of this invention is to remove such disadvantages and defects of the prior art and to improve plug treating by simplifying and improving the accuracy thereof.
  • the air pressure acts thereupon through a steel pipe, thereby to hold the plug at a suitable position.
  • the plug remains in steel pipe to be rolled, it is held at the end of a mandrel bar due to a pressing force used to smooth the roll ing work.
  • the plug which is now held between the rolls is given a sudden large pushing force of air pressure, and consequently the plug is suitably ejected. It is, therefore, unnecessary for the operator to extract the plug from the mandrel end one at a time as in the prior art. It is possible to extract the plug automatically, exactly and efficiently, and to relieve the operator of heavy labor, and also reduce possibilities of errors and accidents.
  • Another object of the invention is to properly recover the extracted plug as mentioned above, and carry it up to a high position corresponding to the specified inserting position in preparation for the following operation.
  • the plug ejected from the mandrel is moved to a position below the working position (1m at least, and normally around 1.5 to 2m below).
  • the plug is fairly heavy and retains a considerably high temperature.
  • lifting the plug to the required position in preparation for the next step stooping heavy labor is required of the operator, because he would normally use clipping tools in the same way as he would for the plug extraction. Accordingly the advantages of the automatic plug ejecting operation would be considerably diminished.
  • the plug is automatically recovered to the original position in preparation for the following operation.
  • the recovered plug is effectively cooled until it is set on the mandrel at the next rolling step.
  • the entire mandrel handling operation is simple and rapid. Thus the disadvantage of the prior art is removed.
  • FIG. I is a side view, partially in section, depicting an embodiment of the apparatus of the invention.
  • FIG. 2 is a sectional view depicting a plug disposed at the end of a mandrel bar
  • FIG. 3 is a side view, partially in section, depicting a joint of a cooling pipe and rod cap
  • FIG. 4 is a sectional view, taken along the IV IV of the embodiment of FIG. 3;
  • FIG. 5 is a sectional view depicting a feed-water mechanism
  • FIG. 6 is a side view, air cylinder portion
  • FIG. 7 is a perspective view depicting a plug recovery mechanism
  • FIG. 8 is a disassembled perspective view of the embodiment of FIG. 7.
  • FIG. 1 An apparatus comprising a partially in section, depicting an pair of rolling rolls 1, l; back-stop mechanism 2 located in back of the rolls 1, l; mandrel bar 3 located between the rolls 1, l and the back-stop mechanism 2; waterfeed mechanism 4 positioned behind the back-stop mechanism 2; air-cylinder mechanism 5 placed further behind; and plug recovery mechanism 6 located in front of the rolling rolls 1, 1.
  • the rolling rolls 1 l are each provided with plural roll kalibers 11 which slant at an angle from the peripheries of the rolls.
  • the back-stop mechanism 2 comprises main body 27 fixed on a suitable supporting base 26 of concrete or the like; a back stop plate 28; a rear plate 28a between which is a support cylinder 25 into which a cooling pipe 12 may be thrust.
  • sup port cylinder 25 is fixed or attached to main body 27 with a bar sleeve 24 screwed to the front end of the support 25.
  • the support cylinder 25 is also fixed or attached by a nut 29 screwed to the back of rear plate 28a.
  • the base end of the mandrel bar 3 is fixed or attached, such as by welding, fasteners, etc., to the front end of bar sleeve 24.
  • the back-stop mechanism 2 is used for holding the mandrel bar 3, as depicted.
  • the mandrel bars intermediate portion is not shown in FIG. 1. Its length is sufficiently long to cover the length of steel pipe produced through the rolling process and it is generally more than m, sometimes over m.
  • the cooling pipe 12 is positioned inside the mandrel bar 3.
  • FIGS. 3 and 4 depict the relation between this cooling pipe 12 and the mandrel bar 3.
  • guide blades 13 are arranged in different axial positions but in the same angular relation radially to the axial direction of the pipe 12 as depicted. Even when the cooling pipe 12 is longer than 15m, it is so moved as to be located within the mandrel and parallel to the center line of the mandrel bar 3.
  • the base end of the cooling pipe 12 extends to the rear of back-stop mechanism 2, and joins water-feed mechanism 4 through a joint member 14 as shown in FIG. 1.
  • a screw or threads 15 are formed on the base end of cooling pipe 12.
  • joint member 14 is connected to another joint member 43, which is depicted at the end of shaft cylinder 41 of water-feed mechanism 4 opposite joint member 14.
  • Joint members 14 and 43 are coupled together with a tightening device 43a.
  • rod cap 30 is depicted at the front end of cooling pipe 12.
  • the base end of rod cap 30 is inserted into the inner hole of cooling pipe 12 and attached thereto by welded portion 31; the front end of cooling pipe 12 is, thus, closed by the rod cap 30.
  • Small holes 16 are bored in cooling pipe 12 near the rod cap portion.
  • cooling water which is supplied from water-feed mechanism 4, is jetted into the mandrel bar 3.
  • the rod cap 30 can be also incorporated into the mandrel bar 3.
  • FIG. 2 depicts one embodiment of the front end of mandrel bar 3 and plug 30.
  • a bar cap 32 is fastened with a screw joint 37 with a packing material 33 therebetween.
  • a sleeve 34 Between the base end of the bar cap 32 and the peripheral surface of the rod cap 30 there are located a sleeve 34, a cylindrical synthetic resin packing 36, and spring material. 35, to provide a sealing mechanism for substantially perfect water tightness to the section between the bar cap 32 and the mandrel bar 3 or rod cap 30.
  • a shaft lever 70 of a plug 7 is set into the inner hole 32a of the bar cap 32.
  • this shaft lever 70 forms a bulging or larger diameter part 71 which makes a section substantially suitable to be positioned into the above inner hole 32a.
  • the plug 7 is held to the narrowed front end side by means of projection 72.
  • Tail end 71a of the shaft lever 70 is located against the end 30a of the rod cap 30.
  • FIG. 5 there is depicted details of which comprises shaft cylinder 41 positioned n substantially the center of cylinder 42 held by mechanism base 420.
  • This shaft cylinder 41 is charged with packings 47 for end members 46 at the front and rear ends of cylinder 42, and is set with packing holder 48 and stopper 49. It is so set as to be movable in the axial direction.
  • the inner hole 40 is formed from its top side with small holes 44 passing through said cylinder 42 at the base end thereof.
  • the cylinder 42 has a water injection port 45 so that cooling water may be jetted in at specific pressures. Cooling water applied into cylinder 42 goes into the inner hole 40 through the small holes 44, and is fed into cooling pipe 12 (of FIG. 1).
  • the cooling water which reaches the front end of cooling pipe 12 is jetted into the mandrel bar 3 through small holes 16 as shown in FIG. 3 during the rolling stop, the mandrel bar 3 is thus cooled from the inside.
  • Water cooling the inside of mandrel bar 3 flows backwards to the base end side of the mandrel bar 3, and is discharged from the base end of support cylinder in the back stop mechanism 2 (of FIG. 1.).
  • the cooling water flowing from water-feed mechanism 4 always cools the mandrel bar 3, cooling pipe 12 and the plug 7 to prevent them from being deformed and damaged.
  • engaging part 50 formed on the base end of shaft cylinder 41 is coupled with sliding rod 52 (See FIG. 6) of an air cylinder 5 which is a reciprocating cylinder, through the joint 51 of FIG. 1
  • the air pressure in this accumulator 58 also may act at the termination of the rolling operation, to produce rapid and exact piston action of air cylinder 5 by virtue of compressed air from the compressed air supply source positioned at a location considerably away from the cylinder.
  • FIGS. 1, 7 and 8 The details of the plug recovery mechanism 6 before the rolling rolls 1, 1 is shown in FIGS. 1, 7 and 8.
  • a chute 63 is positioned through a plug receiving conduit 62.
  • a plug receiver 66 connected by an axle to slide base 64.
  • Piston rod 68 of the cylinder 67 is coupled with said slide base 64.
  • slide base 64 and plug receiver 66 may be moved along guide member 69 so that the plug may travel on a plug receiving base 84 located on substantially the same level as that of the above mandrel bar 3.
  • a guide member 69 is provided at a suitable position and a plug receiver 84 is fastened at its top.
  • a support seat 83 of this plug receiver 84 is supported by such a support frame 82 as shown in FIG. 1.
  • Inside the holding seat 83 a contact 85 is protruded on both sides of guide member 69 as shown in FIGS. 7 and 8.
  • Guide member 69 has placed thereon Turning to FIG. 6, sliding rod 52 of air cylinder 5 is a box-type slide base 64.
  • Hangers 74 74 hanging down from both sides of the guide member 69 are equipped with spindle 75, which have rollers 76, 76 as depicted. The rollers 76, 76 swivel respectively on ether side of the guide member 69.
  • Piston rod 68 of cylinder is connected to spindle 75 located in the rear side.
  • a push seat 73 is protruded in front of which, receiving end of hanger 77 is equipped with contacts 78, which hang on both sides of plug receiver 66, and is rotatably, by the pivot connection to upper part of slide base 64 with a pivot rod 65.
  • a receiving piece 81 is furnished on the receiving surface 80 to receive and stop plug 7 which may be received through the conduit 62 so that the shaft lever 70 would not be damaged.
  • plug 7 is thus also correctly positioned on the plug receiver 66.
  • a steel pipe may be sent to the outside of plug 7 positioned on the end of mandrel bar 3, to be rolled between the rolling rolls 1, 1.
  • cooling pipe 12 and rod cap 30 return to their non-operated position due to the air pressure supplied from hole 56 of the cylinder 5.
  • Front end 30a of rod cap 30 takes a fully retreat position 30a in FIG. 2.
  • Bulging part 71 of the shaft lever 70 of plug 7 is, as depicted in FIG. 2, kept in the inner hole 32a of bar cap 32 to form a proper clearance between the end surface 71a and the end surface 30a.
  • cooling water is supplied into cooling pipe 12 from water-feed mechanism 4 at a pressure of from 1.5 to 2Kg/cm (preferably from 1.6 to l.8Kg/cm at a flow rate of from 20 to 35 l/min.
  • Cooling water which reaches the top of cooling pipe 12 is jetted into mandrel bar 3 through small holes 16 and flows backward, and is discharged from the tail end of support cylinder 25 coupled with the base end of mandrel bar 3.
  • the mandrel bar 3 is supplied with cooling water.
  • air cylinder 5 is supplied with the compressed air of from 4 to SKg/cm, (preferably around from 5.5 to 6Kg/cm to push forward rod cap 30.
  • the steel pipe located between the rolls 1, l and plug 7 is sent out. Constraining force, which has checked plug 7 between the rolling rolls 1, 1, through the pipe, is released. Due to the pressure of compressed air, cooling pipe 12 and rod cap 30 instantly go forward to eject plug 7 into receiving conduit 62.
  • air pressure is kept effective on air cylinder 15, while steel pipe is being rolled, cooling pipe 12 and rod cap 30 are constantly subject to the forward projecting force.
  • This force acts as a plug ejecting force at the moment when the steel pipe goes out.
  • compressed air is no longer supplied to air cylinder 5 and cooling pipe 12 is recovered.
  • the ejecting force ejects normally plug 7 forward a suitable distance.
  • plug slides through the receiving conduit 62 and chute 63 to plug receiver 66, where it is stopped by the receiving piece 81 at a suitable position.
  • air cylinder 67 begins operation to lift the slide base 64 along the guide member 69.
  • the plug receiver 66 on slide base 64 is lifted together with the plug.
  • contact portion 78 formed below the hanging piece 77 of plug receiver 66 is brought in to contact with the contact which is depicted inside supporting seat 83. This sets up the plug receiver 66 to be about to the axis 65. Consequently plug 7, received on plug receiver 66, is rotated into a plug receiving base 84.
  • plug receiving base 84 is suitably air-cooled or water-cooled in preparation for the next use.
  • plug receiving base 84 is at almost the same level as the mandrel bar 3, and can be easily set on to the end of mandrel bar 3 mechanically or manually.
  • Method of ejecting a plug from a pipe rolling mill comprising the steps of placing said plug on one end of a mandrel, applying a force originated by pressurized gas through said mandrel and against said plug during rolling of said pipe whereby upon completion of said rolling said force causes rapid ejection of said plug from said mandrel.
  • Method of claim 1 further comprising the step of applying a cooling liquid into said mandrel during said rolling operation.
  • Apparatus for ejecting a plug from a pipe rolling mill comprising a mandrel means, said plug being disposed at one end of said mandrel means with said pipe being attached to said plug, slidable means disposed within said mandrel, gas operated drive means positioned to be contact with said slidable means and means contactable to said slidable means and movable against said pipe.
  • Apparatus of claim 7, further comprising a liquid feeding means disposed between said drive means and said mandrel means and wherein said slidable means has holes therein through which liquid can travel and further comprising means connectable between said liquid feeding means and said slidable means for supplying said liquid to said mandrel through said holes of said slidable means thereby to cool said mandrel means.
  • liquid feeding means comprises a cylinder and a shaft disposed therein.
  • said plug recovery means comprises guide means, movable carriage means movably positioned on said guide means, platform means located at the same horizontal level as said mandrel means, and drive means for moving said carriage means from a recovery position to said platform means position.
  • Apparatus of claim 16 wherein said carriage means comprises a recovery station for receiving said ejected plug and rotatable means for moving said receiving station to a position such as to place said ejected plug on said platform means.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Heat Treatment Of Articles (AREA)
  • Lining Or Joining Of Plastics Or The Like (AREA)
US00137143A 1971-04-19 1971-04-26 Method of ejecting plug for rolling mill and an apparatus therefor Expired - Lifetime US3733871A (en)

Applications Claiming Priority (5)

Application Number Priority Date Filing Date Title
GB1000671 1971-04-19
US13714371A 1971-04-26 1971-04-26
AT364071A AT316466B (de) 1971-04-19 1971-04-27 Verfahren und Vorrichtung zum Ausstoßen und neuerlichen Bereitstellen des Walzstopfens für Stahlrohrwalzwerke
DE19712120670 DE2120670A1 (de) 1971-04-19 1971-04-27 Verfahren und Vorrichtung zum Ausstoßen des Walzstopfens für Walzwerke
FR7115395A FR2134263B1 (en:Method) 1971-04-19 1971-04-29

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US3733871A true US3733871A (en) 1973-05-22

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US00137143A Expired - Lifetime US3733871A (en) 1971-04-19 1971-04-26 Method of ejecting plug for rolling mill and an apparatus therefor

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US (1) US3733871A (en:Method)
AT (1) AT316466B (en:Method)
DE (1) DE2120670A1 (en:Method)
FR (1) FR2134263B1 (en:Method)
GB (1) GB1333956A (en:Method)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3930394A (en) * 1973-05-14 1976-01-06 Pavel Ivanovich Orro Mill for plugging tubes and taking them off plug
CN116532495A (zh) * 2023-05-25 2023-08-04 松阳县永欣机械制造有限公司 一种管胚防顶撞控制装置及冷轧管机

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2322674A1 (fr) * 1974-01-10 1977-04-01 Vallourec Dispositif de changement mecanique de mandrins pour laminoirs
US4028923A (en) * 1976-05-04 1977-06-14 Aetna-Standard Engineering Company Plug and shoe changing in piercing and reeling mills
DE2716315C2 (de) 1977-04-07 1978-11-16 Mannesmann Ag, 4000 Duesseldorf Innengekühlter Rohrwalzdorn

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3930394A (en) * 1973-05-14 1976-01-06 Pavel Ivanovich Orro Mill for plugging tubes and taking them off plug
CN116532495A (zh) * 2023-05-25 2023-08-04 松阳县永欣机械制造有限公司 一种管胚防顶撞控制装置及冷轧管机
CN116532495B (zh) * 2023-05-25 2023-11-07 松阳县永欣机械制造有限公司 一种管胚防顶撞控制装置及冷轧管机

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Publication number Publication date
FR2134263B1 (en:Method) 1974-03-08
GB1333956A (en) 1973-10-17
FR2134263A1 (en:Method) 1972-12-08
AT316466B (de) 1974-07-10
DE2120670A1 (de) 1972-11-09

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