US3879972A - Method and apparatus for removing a plug - Google Patents

Method and apparatus for removing a plug Download PDF

Info

Publication number
US3879972A
US3879972A US469564A US46956474A US3879972A US 3879972 A US3879972 A US 3879972A US 469564 A US469564 A US 469564A US 46956474 A US46956474 A US 46956474A US 3879972 A US3879972 A US 3879972A
Authority
US
United States
Prior art keywords
plug
water
nozzle
mill
workpiece
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
Application number
US469564A
Other languages
English (en)
Inventor
Senshu Kanai
Haruo Kamimura
Masachika Numano
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
Original Assignee
Nippon Kokan Ltd
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 Nippon Kokan Ltd filed Critical Nippon Kokan Ltd
Application granted granted Critical
Publication of US3879972A publication Critical patent/US3879972A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Images

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

Definitions

  • This invention relates to a method and apparatus for removing a plug from a rolling mill such as a Mannesmann type piecing machine. a reeling mill and a crossrolling mill or a rotary expander.
  • a rolling mill such as a Mannesmann type piecing machine. a reeling mill and a crossrolling mill or a rotary expander.
  • a blank to be rolled is advanced into the mill while holding a plug mounted on one end of a mandrel between guide shoes of the mill.
  • the plug is left in the mill after completing a rolling operation.
  • To remove the plug from the mill it has been the practice to use a rod shaped tool or a combination ofa rod shaped tool and a lever.
  • Such method however. depends upon manpower. so that it requires a large labour. time and skill. It will be readily understood that it is not easy to remove a hard body having a circular cross-section. such as a plug. from a mill because the rolling operation is performed under high temperature environments so that the operator must manipulate a long rod-shaped tool from a position remote from the mill. Although it is necessary to remove the plug after each rolling operation for inspection and cooling. and to use a cold plug at each operation. the operator is unwilling to do so. with the result that there is a possibility of using a damaged or deformed plug and thus producing defective products. In addition. the plug is severely worn. To facilitate the operation of such a long rod-shaped tool there is often used a piston-cylinder assembly. but even when such an assembly is used.
  • An alternative method has also he proposed wherein the plug is removed from the mill while the plug is being secured to one end of a mandrel. Although this alternative method permits ready removal of the plug from the mill. it is not easy to dismount the plug from the mandrel. More particularly. according to this method. where the plug is worn out it is necessary to stop the operation of the mill for exchanging the plug. to dismount the plug from the mandrel by securely holding the plug when it is completely removed from the workpiece. and then pulling out the mandrel bar or by moving the plug and mandrel together with the workpiece.
  • water under high pressure is utilized to remove the plug remaining in the mill.
  • the ejecting force and the lubricating property of the water are utilized to readily remove the plug.
  • the weight of the plug is about 30 Kg in the case of a piercing mill. or about 40 Kg in the case ofa reeling mill.
  • Another object of this invention is to provide a novel method and apparatus capable of smoothly removing the plug and conveying the removed plug to a mounting and dismounting station without splashing the water ejected underhigh pressure onto the mill and associated apparatus in the working area and without interfering with the operation thereof.
  • a water collector is disposed to oppose a nozzle. used to eject the high pressure water. for receiving the ejected water. With this arrangement it is possible to readily remove the plug without splashing the water in the operating area.
  • the removed plug is conveyed to a plug recovering mechanism situated below the water collector and in front thereof.
  • Another important object of this invention is to provide a new and improved method and apparatus capable of preventing degrading of the products and decreasing of' the production efficiency caused by a damaged plug. and of improving the useful life of the plug. in each of the prior art methods described above. as the plug is not exchanged frequently. production of defective products caused by a damaged or deformed plug is inevitable. thereby not only reducing the yield of satisfactory products but also requiring a large cost of installation and operation of the mill.
  • the method of this invention since the plug is removed readily without using any manpower. it is possible to exchange the plug after each rolling operation. Conse quently. it is possible always to use a satisfactory plug. thus enabling to increase the yield of satisfactory products and to increase the operating life of the plug. Also. it is possible to reduce the cost of installation and operation of the mill because it is only necessary to install a nozzle for ejecting water under high pressure. a water collector and a mechanism for moving these elements in the vertical direction.
  • FIG. 1 shows a side elevation. partly in section. of a piercing mill embodying the invention
  • FIG. 2 is a diagram showing a condition of the mill immediately prior to the piercing operation
  • FIG. 3 is a diagram showing a condition of the mill during the piercing operation
  • FIG. 4 is a diagram showing the manner of removing the plug
  • FIG. 5 is a diagram similar to FIG. 2 showing a condition immediately prior to pierce a new workpiece.
  • a piercing mill embodying the invention and shown in FIG. 1 comprises a housing I mounted on a base 16, a chair 2, and a pair of guide shoe holders 3 carrying opposed guide shoes 4.
  • a water cannon 9 and a workpiece guide 7 having a V shaped cross-section On the inlet side of the housing I are provided a water cannon 9 and a workpiece guide 7 having a V shaped cross-section.
  • a nozzle 11 between the guide 7 and the cannon 9 for ejecting water under high pressure.
  • the nozzle 11 is supported by a holder 17 and is operated in the vertical direction by a piston-cylinder assembly I between an elevated position in line with the pass line of the mill and a lowered position.
  • a plug trough 5 On the exit side of the housing 1 are provided a plug trough 5, a rearward assembly 8 including a guide for the pierced-workpiece receiving device, a mandrel holder and a mechanism for conveying the pierced workpiece to one side of the pass line. not shown, and a pull out and transfer mechanism I for the workpiece. Since these mechanisms are well known in the art it is believed unnecessary to show and describe them in detail. According to this invention. a plug recovering mechanism 6 and a water collector 12 are provided between the rearward assembly 8 and the plug trough S.
  • the plug recovering mechanism 6 and water collector 12 are operated into alignment with the pass line of the piercing mill by suitable operating mechanisms such as piston-cylinder assemblies 13 and 14 which are positioned beneath them.
  • suitable operating mechanisms such as piston-cylinder assemblies 13 and 14 which are positioned beneath them.
  • suitable pipings and valves are provided for the piston-cylinder assemblies I0, I3 and 14 for supplying thereto air or liquid under pressure.
  • plug recovering mechanism 6 and water collector I2 are shown to be movable in the vertical direction. it is also possible to move them in the lateral or oblique directions. For this purpose, instead of reciprocating them by piston-cylinder assemblies. it is also possible to use rotary or inclining type operating mechanisms. Further.
  • the nozzle II may be positioned on the output side and the plug recovering mechanism and the water collector on the input side for discharging the plug to the input side.
  • the plug recovering mechanism 6 is designed to receive the plug discharged through the plug trough while the water collector I2 is designed to have a cup-shaped configuration to collect the pressurized water ejected from nozzle 11 and prevent splashing of the collected water to the surrounding so as to prevent the water from reaching a product ahead of the water collector I2.
  • a pair of mill rolls 18 is positioned on the opposite sides of the center of guide shoes with their axes inclined with respect to the pass line.
  • the housing I is provided with an upper guide hanger 19, in a manner well known in the art.
  • the nozzle 11 and water collector [2 are held in the positions below the pass line as shown in FIG. 2.
  • a workpiece 20 to be pierced such as a circular steel blank, is advanced by a pusher 21 toward the plug 22 mounted on one end of a mandrel bar 23 and held between upper and lower guide shoes 4 through the cannon 9.
  • the workpiece is pierced as shown in FIG. 3 to form a hollow product 25.
  • the nozzle I] is raised to align with the pass line by the piston-cylinder assembly 10.
  • the water collector 12 is also raised to the pass line, water under high pressure is ejected through nozzle 11, whereby plug 22 remaining between the guide shoes 4 after completion of the piercing operation is forced into the plug recovering mechanism through the plug trough 5 as shown in FIG. 4.
  • the plug 22 can be readily advanced to the recovering mechanism 6 by the high pressure and the lubricating action of the water ejected from nozzle ll.
  • the pressure of the water is higher than Kg/cm, the plug is advanced in an extremely short time as described above. Once started to move by the high pressure water.
  • the plug will have sufficient inertia of motion to continue its smooth movement towards the recovering mechanism although the driving force applied to the plug decreases gradually.
  • the plug 22 received by the plug recovering mechanism 6 is recovered by lowering the same by operating piston-cylinder assembly 13. Then a new plug 220 ia mounted on the mandrel bar 23 as shown in FIG. 5 and advanced to the working position shown in FIGS. 2 and 3 for piercing a new workpiece.
  • EXAMPLE I PIERCING MILL In this example. circular steel rods were rolled by a Mannessmann piercing mill as shown FIG. 1 to obtain steel pipes having a diameter of 200 mm. A plug 22 having a weight of Kg was mounted on a mandrel rod and used for piercing the workpiece as shown in FIGS. 2 and 4. After the piercing operation the plug left in the guide shoes 4 was recovered by ejecting water under a high pressure of 40 Kg/cm through nozzle II for only about 1.5 seconds. Of course the nozzle 11 was raised to the pass line and the total time required for recovering the plug from an instant at which the nozzle was raised to an instant at which the nozzle. plug collecting mechanism and water collector were lowered. was less than 3 seconds in each of many repeated operations. The time required for performing one cycle of operation was about 30 seconds showing that the method of this invention manifests high productivity.
  • the time required for removing the plug is less than 3 seconds as described above, and this time is substantially equal for a number of consecutive operations.
  • the time required for raising the water collector 12 is about 0.5 seconds and the time required for the mandrel bar 23 to retract after completion of the piercing operation is about 3 to 5 seconds.
  • a plug having a drum-like shape. a diameter of 230 mm and a weight of 76 Kg.
  • This plug was mounted on one end of a mandrel bar and the plug left in the guide shoes after each reeling operation was removed and recovered by ejecting water through the nozzle under a pressure of 30 Kg/cm It was possible to readily remove the plug by ejecting the high pressure water only for L6 seconds which should be compared with a time of from 5 to 9 seconds required for the prior art methods utilizing rod shaped tools and lever. or rod shaped tools actuated by pistoncylinder assemblies and lever. Similarly to Example I, it was possible to increase the operating life of the plug. and decrease the percentage of rejects caused by internal scratches of the products.
  • a'method of removing the plug left in the mill after completion of the rolling operation comprising the steps of advancing a nozzle for ejecting water under high pressure and a water collector into alignment with the pass line of the mill. ejecting the water against said plug for removing the same from the mill by the force applied to the plug by the ejected water and by the lubricating action of the water. and collecting the ejected water by said water collector so as to prevent splashing of the water.
  • a plug mounted on one end of a reciprocating mandrel bar is used for piercing, reeling or cross-rolling a workpiece. and said plug is left between a pair of guide shoes in said rolling mill after completion of the rolling operation.
  • the improvement which comprises a nozzle mounted on the inlet side of said mill for ejecting water under high pressure.
  • a water collector mounted on the output side of said mill for receiving the ejected water.
  • operating means for advancing said nozzle and said water collector into alignment with the pass line of said rolling mill and for retracting said nozzle and said water collector from said pass line, plug recovering means mounted on the output side of said mill. and means for ejecting water under high pressure through said nozzle against said plug remaining between said guide shoes forcing the plug toward said plug recovering means.
  • the rolling mill according to claim 4 which further comprises a cylindrical water cannon between said nozzle and said guide shoes for guiding said workpiece and a trough between said guide shoes and said plug recovering means for guiding the plug.
  • said operating means includes for advancing said nozzle into alignment with said pass line immediately after the trailing end of the workpiece has passed by said nozzle. and means for advancing said water collector into alignment with the pass line immediately after trailing end of the workpiece has passed by said water collec-

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Perforating, Stamping-Out Or Severing By Means Other Than Cutting (AREA)
US469564A 1973-05-17 1974-05-13 Method and apparatus for removing a plug Expired - Lifetime US3879972A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP48054098A JPS5118385B2 (cs) 1973-05-17 1973-05-17

Publications (1)

Publication Number Publication Date
US3879972A true US3879972A (en) 1975-04-29

Family

ID=12961133

Family Applications (1)

Application Number Title Priority Date Filing Date
US469564A Expired - Lifetime US3879972A (en) 1973-05-17 1974-05-13 Method and apparatus for removing a plug

Country Status (4)

Country Link
US (1) US3879972A (cs)
JP (1) JPS5118385B2 (cs)
DE (1) DE2424005C3 (cs)
IT (1) IT1012399B (cs)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6158262A (en) * 1997-10-13 2000-12-12 Sumitomo Metal Industries, Ltd. Piercing mill and cannon exchange method
CN102151702A (zh) * 2011-05-05 2011-08-17 山东墨龙石油机械股份有限公司 无缝钢管轧机后导向装置

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS51101238U (cs) * 1975-02-07 1976-08-13
JPS5217040A (en) * 1975-07-28 1977-02-08 Siemens Ag Indicating instrument
JPS5912772Y2 (ja) * 1978-09-20 1984-04-17 三洋電機株式会社 テ−プレコ−ダ−の制御回路
JPS58125690U (ja) * 1982-11-02 1983-08-26 株式会社相沢鉄工所 プレスの表示装置
JPS6415602U (cs) * 1987-07-14 1989-01-26

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US651714A (en) * 1900-02-10 1900-06-12 Ellwood Ivins Seamless-tube-rolling machine.
US971512A (en) * 1909-01-29 1910-10-04 Wallace H Rowe Machine for piercing billets.
US1141426A (en) * 1911-05-03 1915-06-01 Frank E Simpkins Mandrel stripping and cooling mechanism.
US1919390A (en) * 1931-08-28 1933-07-25 Nat Tube Co Expanding mill
US2583834A (en) * 1948-09-03 1952-01-29 United States Steel Corp Automatic twin bar-bridge bench piercer mill
US2771800A (en) * 1952-03-06 1956-11-27 United States Steel Corp Plug rolling mill

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US651714A (en) * 1900-02-10 1900-06-12 Ellwood Ivins Seamless-tube-rolling machine.
US971512A (en) * 1909-01-29 1910-10-04 Wallace H Rowe Machine for piercing billets.
US1141426A (en) * 1911-05-03 1915-06-01 Frank E Simpkins Mandrel stripping and cooling mechanism.
US1919390A (en) * 1931-08-28 1933-07-25 Nat Tube Co Expanding mill
US2583834A (en) * 1948-09-03 1952-01-29 United States Steel Corp Automatic twin bar-bridge bench piercer mill
US2771800A (en) * 1952-03-06 1956-11-27 United States Steel Corp Plug rolling mill

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6158262A (en) * 1997-10-13 2000-12-12 Sumitomo Metal Industries, Ltd. Piercing mill and cannon exchange method
CN102151702A (zh) * 2011-05-05 2011-08-17 山东墨龙石油机械股份有限公司 无缝钢管轧机后导向装置
CN102151702B (zh) * 2011-05-05 2012-07-25 山东墨龙石油机械股份有限公司 无缝钢管轧机后导向装置

Also Published As

Publication number Publication date
DE2424005B2 (de) 1978-12-14
IT1012399B (it) 1977-03-10
DE2424005C3 (de) 1979-08-16
JPS503946A (cs) 1975-01-16
DE2424005A1 (de) 1974-12-05
JPS5118385B2 (cs) 1976-06-09

Similar Documents

Publication Publication Date Title
CN211052160U (zh) 一种单线冷轧管机生产线
CN205949696U (zh) 钢管缩管机
US3879972A (en) Method and apparatus for removing a plug
CN107824624A (zh) 一种芯棒台旋转式冷拔机
US4037449A (en) Continuous flow plug mill system
US3572080A (en) Production of pointed workpieces
US2024514A (en) Method and apparatus for making tubes
CN109692885B (zh) 三棱钢管的生产工艺
CN106238480B (zh) 油压式钢管拉拔机
US3173318A (en) Method and apparatus for producing pipes of shorter lengths from a continuously produced pipe
CN210450785U (zh) 用于筒形类锻件拔长的锻造装置
US3581545A (en) Metal extrusion press of turntable type
CN107583954B (zh) 热拉拔连轧制管生产线及制管方法
US2356734A (en) Tube mill
CN110918798A (zh) 一种水管接头的自动扩管设备
US2672234A (en) Extrusion press
CN104942003A (zh) 一种轧机出料机构
CN210281637U (zh) 一种手机框生产线
US4406143A (en) Return pass practice for the high mill of a seamless-pipe mill
CN208528239U (zh) 一种把手自动送料断料倒角自动化设备
GB1563660A (en) Device for coupling a mandrel to a mandrel-bearing slide in a piercing and rolling mill
CN215696889U (zh) 一种金属管全自动制头设备
US3733871A (en) Method of ejecting plug for rolling mill and an apparatus therefor
US2083698A (en) Push bench method and apparatus
SU1022760A1 (ru) Способ продольной прокатки труб