Classifications

• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
  • B21B—ROLLING OF METAL
  • B21B19/00—Tube-rolling by rollers arranged outside the work and having their axes not perpendicular to the axis of the work
  • B21B19/02—Tube-rolling by rollers arranged outside the work and having their axes not perpendicular to the axis of the work the axes of the rollers being arranged essentially diagonally to the axis of the work, e.g. "cross" tube-rolling ; Diescher mills, Stiefel disc piercers or Stiefel rotary piercers
  • B21B19/04—Rolling basic material of solid, i.e. non-hollow, structure; Piercing, e.g. rotary piercing mills
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
  • B21B—ROLLING OF METAL
  • B21B39/00—Arrangements for moving, supporting, or positioning work, or controlling its movement, combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
  • B21B39/14—Guiding, positioning or aligning work
  • B21B39/16—Guiding, positioning or aligning work immediately before entering or after leaving the pass
  • B21B39/165—Guides or guide rollers for rods, bars, rounds, tubes ; Aligning guides

Definitions

• the present invention relates to a seamless steel pipe piercing rolling mill and a method for replacing a canon used in the rolling mill.More specifically, the present invention automates the replacement of cannons at the time of pipe making setup change, thereby reducing the working time.
• the present invention relates to a piercing and rolling mill capable of producing a small number of seamless steel pipes from a small diameter to a large diameter, and a method of replacing a canon thereof in order to shorten the production time.
• the so-called Mannesmann pipe manufacturing method is widely used as a method for hot-working seamless steel pipes.
• a solid round billet heated to a predetermined temperature is used as a material to be rolled, and the round billet is fed to a piercing mill (so-called piercer) to pierce the shaft center portion.
• piercer piercing mill
• the diameter is reduced and the thickness is reduced. It is fed to the subsequent elongation mill and elongation-drawn. After that, it passes through a stretch reducer, a reeler, a sizer, etc., and then undergoes a finishing process for polishing pipes, shape correction, and sizing to produce seamless steel pipes as products.
• Fig. 1 is a view for explaining the state of piercing of a material to be rolled in a piercing mill.
• the piercing rolls 1 and 1 are path lines serving as a moving axis of a round billet 3 as a material to be rolled in a rolling direction.
• X Anisymmetrically arranged so as to form a predetermined intersection angle and inclination angle with respect to X.
• the feed line XX is fed in the direction of the white arrow.
• the round billet 3 is inserted between the perforating rolls 1 and 1 and then moves on the pass line while rotating, and a hole is made in the axial center of the round billet by the plug 2 to form a hollow shell.
• the plug 2 is supported by a mandrel supporting device (not shown) so as to be located between the perforating rolls along the pass line.
• the round billet 3 which is the material to be rolled, is vigorously swirled during drilling. For this reason, if the round billet bends or bends due to uneven cooling after heating the billet, large round whirling occurs during piercing and rolling.
• whirling occurs in the material to be rolled, not only is the vibration and noise intense, but it also violently hits the entry-side transport section of the piercing mill, making piercing and rolling unstable, and the outer surface of the perforated hollow shell. May cause flaws.
• a cannon 4 as a cylindrical guide is arranged on the pass line X--X on the entry side of the piercing mill. You. That is, even if whirling occurs due to the bending of the material in the round billet 3, the round billet 3 is swirled in the cannon, so that the outer surface of the hollow shell is protected, and the above problem is solved.
• the cannon 4 provided on the entrance side of the piercing mill absorbs the whirling of the round billet 3, it must be firmly fixed to the rolling mill body.
• the gap between the inner diameter of the cannon and the outer diameter of the round billet must be kept within a certain range. Therefore, every time the round billet dimensions of the material to be rolled are changed, it is necessary to replace the cannon. Also, since the round billet is maintained at a high temperature during piercing and rolling, the whirling of the round billet will significantly damage the inner surface of the cannon. For this reason, even if there is no change in the dimensions of the round billet, it is necessary to periodically replace it from the viewpoint of cannon maintenance.
• the present invention takes into account the problem of canon replacement work in conventional piercing mills, and automates the replacement of cannons at the time of pipe making setup change, etc., and reduces the number of seamless steel pipes from small to large diameter pipes.
• the purpose of the present invention is to provide a pier mill and a method for replacing a canon thereof in a variety of production.
• the gist of the present invention is to provide a piercing mill used for manufacturing a seamless steel pipe of the following (1) to (3) and a method for replacing a cannon used in a piercing mill for a seamless steel pipe. It is in.
• the part numbers will be described later
• a pair of piercing rolls that are arranged around the pass line X—X where the material to be rolled moves spirally, and are arranged along the pass line X—X so as to be located between the piercing rolls. It consists of a plug and a mill housing for accommodating them, and a drilling machine for a seamless steel pipe producing apparatus having a cannon 4 for preventing rolling of the material to be rolled on the entry side on the pass line XX of the piercing roll.
• the hole rolling mill is provided with means 15 for turning the cannon holder 5 holding the cannon 4 and means 16 for slidingly moving the cannon holder 5 along the pass line.
• a piercing and rolling mill is provided with means 15 for turning the cannon holder 5 holding the cannon 4 and means 16 for slidingly moving the cannon holder 5 along the pass line.
• Pass line X through which the material to be rolled moves. It consists of a pair of piercing rolls, a plug located along the pass line XX between the piercing rolls, and a mill housing for accommodating them.
• a perforated rolling mill of a seamless steel pipe manufacturing apparatus provided with a cannon 4 for preventing whirling of the material to be rolled on the upper entry side, a cannon holder 5 for holding the cannon 4 is mounted on the mill housing in a pass line X.
• Placed al Pasurai pivoted on emissions X- X is slid over the path line X- X, and piercing mill which is characterized by being configured to clamp in place.
• a canon replacement characterized in that the Canon holder 5 for holding the holder in the vertical direction of X is swiveled on the pass line X—X, then slides on the pass line X—X, and then clamped on the main body of the piercing mill.
• the cannon holder is supported from the cannon holder mounting table to the nip and transferred to the side where the piercing mill is inserted, and the cannon is vertically inserted into the pass line at a predetermined position. Hold in direction It is desirable to make it.
• FIG. 1 is a view for explaining the state of piercing of a material to be rolled in a piercing mill
• Fig. 2 is a perspective view showing the entire configuration of a canon of the present invention and a canon holder holding the same
• FIG. 3 is a front view of a side including a piercing mill according to the present invention, with a cannon and a cannon holder attached.
• FIG. 4 is a side cross-sectional view illustrating steps for transferring the Canon holder and mounting the holder frame.
• FIG. 5 is a side cross-sectional view illustrating a turning movement step of the cannon holder.
• FIG. 6 is a side cross-sectional view illustrating steps of sliding movement and clamping of the Canon holder.
• the piercing and rolling mill is characterized in that it comprises means for turning a cannon holder holding a cannon and means for slidingly moving a cannon holder along a pass line, thereby automatically replacing the cannon.
• a cylinder for turning the holder frame that holds the cannon holder in the mill housing of the piercing mill in a direction perpendicular to the pass line, and a cannon holder along the pass line on the holder frame.
• a cylinder to be slid and a cylinder for fixing the cannon holder to the rolling mill main body are provided in the mill housing. By operating each of the cylinders, the cannon holder is turned on the pass line to slide on the pass line. This is a piercing rolling mill configured to be moved and clamped at a predetermined position.
• the cannon replacement method according to the present invention is used for a piercing mill having the above configuration.
• the Canon holder that holds the cannon in the vertical direction of the pass line is swung on the pass line, and then slides on the pass line, and then the Canon holder is clamped to the main body of the piercing mill.
• This is a method for automating the exchange of cannons.
• the replacement of the cannon is performed by a combination of the turning movement and the sliding movement, so that the cannon can be effectively used even in a small space on the side of the rolling mill. It can automate all processes from removal of a new canon to installation of a new canon. For this reason, as described above, not only can the replacement work time be reduced, but it also has a significant effect on labor saving of the work itself.
• FIGS. 2 to 6 specific configuration examples of the present invention are shown in FIGS. 2 to 6, and the effects thereof will be described in detail.
• the same reference numerals are used for members common to the drawings.
• FIG. 2 is a perspective view showing the entire structure of a canon of the present invention and a canon holder 1 for holding the same.
• FIG. 3 is a front view of a side including a piercing and rolling mill according to the present invention. It shows a state where it is attached to the entrance side of the.
• the cannon holder 1-5 holding the cannon 4 is provided with a groove 6 for mounting the holder 1 frame 10, and the guide groove of the holder frame 10 is By the fitting, the Canon holder 5 is supported by the holder frame 10, and the Canon holder 5 and the single holder frame 10 are integrated.
• the cannon holder 5 is provided with a sliding block 7 and a clamp block 8.
• the holder frame 10 is composed of a revolving frame 11 and a sliding frame 12, and the revolving frame 11 uses the revolving shaft 13 as a rotation axis to rotate the cannon holder 5 by the operation of a revolving cylinder 15 described later.
• the sliding frame 12 slides the cannon holder 15 around the sliding shaft 14 as a rotation axis by the action of a sliding cylinder 16 described later.
• the sliding frame 12 has sliding blocks 7 at both ends. Guide rolls are provided at both ends so that the guide roll can be supported.
• a turning cylinder 15 which is a driving source for turning the cannon is disposed above a mill housing 18 of the piercing mill, and the other end of the turning cylinder 15 is a turning frame. 1 Attached to 1. Below the mill housing 18, clamp cylinders 17 for fixing the cannon holder 5 to the mill housing 18 in the final stage are provided on both sides of the cannon holder 5, and are provided through the clamp blocks 8 through the clamp blocks 8. Fix the cannon holder 5 to the rolling mill body. Further, a sliding cylinder 16 that directly connects the turning frame 11 and the sliding frame 12 is mounted on the holder-use frame 10. By operating the sliding cylinder 16, the sliding frame 12 in the form of a bracket at both ends is rotated, and the sliding block 7 is pushed up accordingly, so that the cannon 4 becomes the pass line X-- X Slide along.
• FIG. 4 is a side sectional view for explaining the step (a).
• the cannon holder 5 is stored on the cannon holder base 20 while holding the cannon 4.
• the number of cannon holder holders 20 is selected according to the number of cannons.
• the cannon holders 5 are supported from the canon holder table 20 by the dedicated manufactory 21 and are moved to a predetermined position on the side where the piercing mill enters.
• the Canon holder 5 is gradually lowered so that the guide surface of the holder frame 11 is fitted in the groove, and the holder frame 11 is mounted on the cannon holder 5. Support for play evening 21 is released.
• the cannon holder 15 is held above and perpendicular to the pass line X—X.
• One end of the sliding frame 12 abuts the sliding block 7 to support the cannon holder 5. ing.
• FIG. 5 is a side sectional view for explaining the step (b).
• the turning cylinder 115 mounted on the top of the mill housing 18 is operated, the turning frame 11 turns 90 ° around the turning shaft 13 as a rotation axis.
• the cannon holder 5 also pivots and is positioned on the pass line XX on the entry side of the perforating rolls 1,1.
• a relatively long Canon 4 can be three-dimensionally used even in a small space by transferring it using the turning motion.
• FIG. 6 is a cross-sectional side view illustrating the step (c).
• the sliding cylinder 16 is operated to move the cannon holder 5 along the pass line X—X.
• the sliding frame 12 having a bracket at both ends is rotated.
• the end of the sliding frame 12 opposite to the one that previously supported the sliding block pushes up the sliding block, so the cannon slides along the pass line X—X. I do.
• a guide groove is machined on the sliding surface of the cannon holder, and furthermore, the cannon holder 5 It is desirable to provide a tapered guide in the sliding portion.
• the entire series of cannon replacement work can be automated, greatly reducing work time.
• the work from the removal of the current canon to the installation of the new canon can be performed by the conventional 10
• the replacement of the canon in connection with the change of the pipe-making process can be automated, and the operation time can be greatly reduced.
• high-efficiency production can be achieved in small-quantity multi-product production of seamless steel pipes from small to large diameter pipes.
• the piercing mill and the cannon replacement method of the present invention can be widely used in the field of hot pipe making of steel pipes.

Landscapes

• Engineering & Computer Science (AREA)
• Mechanical Engineering (AREA)
• Metal Rolling (AREA)

Priority Applications (3)

Applications Claiming Priority (2)

Related Child Applications (1)

Publications (1)

Family

ID=17603721

Family Applications (1)

Country Status (4)

Cited By (1)

Families Citing this family (1)

Citations (2)

• 1997
  • 1997-10-13 JP JP27890497A patent/JP3297994B2/ja not_active Expired - Fee Related
• 1998
  • 1998-10-09 WO PCT/JP1998/004572 patent/WO1999019090A1/ja active IP Right Grant
  • 1998-10-09 EP EP98947809A patent/EP1046435B1/de not_active Expired - Lifetime
  • 1998-10-09 DE DE69821138T patent/DE69821138T2/de not_active Expired - Lifetime

Patent Citations (2)

Non-Patent Citations (1)

Also Published As

Similar Documents

Legal Events