WO2014017372A1 - 継目無金属管の製造方法、マンドレルミル及び補助治具 - Google Patents
継目無金属管の製造方法、マンドレルミル及び補助治具 Download PDFInfo
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- WO2014017372A1 WO2014017372A1 PCT/JP2013/069491 JP2013069491W WO2014017372A1 WO 2014017372 A1 WO2014017372 A1 WO 2014017372A1 JP 2013069491 W JP2013069491 W JP 2013069491W WO 2014017372 A1 WO2014017372 A1 WO 2014017372A1
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- Prior art keywords
- mandrel
- mandrel bar
- outer diameter
- auxiliary jig
- rolling
- Prior art date
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Classifications
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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
- B21B25/02—Guides, supports, or abutments for mandrels, e.g. carriages or steadiers; Adjusting devices for mandrels
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B13/00—Metal-rolling stands, i.e. an assembly composed of a stand frame, rolls, and accessories
- B21B13/08—Metal-rolling stands, i.e. an assembly composed of a stand frame, rolls, and accessories with differently-directed roll axes, e.g. for the so-called "universal" rolling process
- B21B13/10—Metal-rolling stands, i.e. an assembly composed of a stand frame, rolls, and accessories with differently-directed roll axes, e.g. for the so-called "universal" rolling process all axes being arranged in one plane
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B17/00—Tube-rolling by rollers of which the axes are arranged essentially perpendicular to the axis of the work, e.g. "axial" tube-rolling
- B21B17/02—Tube-rolling by rollers of which the axes are arranged essentially perpendicular to the axis of the work, e.g. "axial" tube-rolling with mandrel, i.e. the mandrel rod contacts the rolled tube over the rod length
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B17/00—Tube-rolling by rollers of which the axes are arranged essentially perpendicular to the axis of the work, e.g. "axial" tube-rolling
- B21B17/02—Tube-rolling by rollers of which the axes are arranged essentially perpendicular to the axis of the work, e.g. "axial" tube-rolling with mandrel, i.e. the mandrel rod contacts the rolled tube over the rod length
- B21B17/04—Tube-rolling by rollers of which the axes are arranged essentially perpendicular to the axis of the work, e.g. "axial" tube-rolling with mandrel, i.e. the mandrel rod contacts the rolled tube over the rod length in a continuous process
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B2261/00—Product parameters
- B21B2261/02—Transverse dimensions
- B21B2261/04—Thickness, gauge
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B2261/00—Product parameters
- B21B2261/02—Transverse dimensions
- B21B2261/08—Diameter
-
- 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 present invention relates to a method for manufacturing a seamless metal pipe, a mandrel mill, and an auxiliary jig, and more particularly, to a method for manufacturing a seamless metal pipe using a mandrel mill, a mandrel mill, and a method for manufacturing a seamless metal pipe. It relates to the auxiliary jig used.
- This application claims priority based on Japanese Patent Application No. 2012-163437 filed in Japan on July 24, 2012, the contents of which are incorporated herein by reference.
- a heated round billet is pierced and rolled by a piercing machine to manufacture a hollow shell.
- a mandrel bar is inserted into the manufactured hollow shell.
- the hollow shell in which the mandrel bar is inserted is stretch-rolled by a mandrel mill.
- each stand of the mandrel mill reduces the thickness of the hollow shell. Therefore, the outer diameter and the wall thickness of the hollow shell are changed by drawing and rolling.
- the stretched hollow shell is heated as necessary, and further drawn and rolled with a sizer or a reducer.
- the seamless metal pipe is manufactured by the above process.
- a plurality of mandrel bars (for example, 10 to 20) are used every time one lot of a hollow shell having a specific size (outer diameter and wall thickness) is manufactured. Therefore, if there are a plurality of sizes of seamless metal pipes to be manufactured, the number of mandrel bars in stock becomes very large. The more inventory, the higher the mandrel bar cost.
- Patent Document 1 and Patent Document 2 propose a technique for reducing the cost of a mandrel bar.
- Patent Document 1 the first half of the rolled part is cut from the used mandrel bar, and the latter half of the support part is left. Then, the first half is replaced with a new first half. At this time, a short joining material is arrange
- Patent Document 2 also divides the mandrel bar into a rolling part that contacts the shell and a holding part that does not contact the shell, as in Patent Document 1.
- the rolling part is coupled to the holding part with screws. Even in this case, since only the rolling part can be repaired and replaced, Patent Document 2 describes that the cost of the mandrel bar can be suppressed.
- the length of the rolled portion is considered to be constant. This is because each stand of the mandrel mill performs thickness reduction, so that the rolling part needs to have a length corresponding to at least the distance from the head stand to the tail stand of the mandrel mill. Therefore, even if the manufacturing cost of the holding part can be reduced by reusing the holding part (supporting part), the manufacturing cost of the rolling part is still applied.
- the rolling part is made of a material superior in strength, heat crack resistance and wear resistance than the holding part, and is more expensive than the material used in the holding part. That is, the manufacturing cost of the mandrel bar depends on the rolling part.
- An object of the present invention is to provide a method of manufacturing a seamless metal pipe, a mandrel mill, and an auxiliary jig that can suppress the cost of a mandrel bar necessary for drawing and rolling.
- a first aspect according to the present invention is a rear-stage stand including a front-stage stand group including a plurality of stands arranged from the top along a pass line, and a plurality of stands arranged behind the front-stage stand group. And a plurality of mandrel bars having different lengths of work parts that are in contact with the hollow shell during stretching and rolling.
- either the front stand group or the rear stand group is subjected to outer diameter reduction and the other is subjected to thickness reduction, or The thickness reduction is performed in both the front stand group and the rear stand group.
- the step of adjusting when the outer diameter of the auxiliary jig is larger than the outer diameter of the mandrel bar, before the auxiliary jig passes through the support roll, The support roll may be lowered.
- a second aspect according to the present invention includes: a plurality of stands arranged along a pass line; and a rear end portion of a mandrel bar disposed on an entrance side of a leading stand among the plurality of stands.
- a retainer comprising: a rod-shaped auxiliary jig having a gripping portion at the front end thereof; a gripping device capable of gripping the rear end of the auxiliary jig; and a drive device that advances the gripping device along the pass line;
- a mandrel mill comprising: (7)
- a third aspect according to the present invention is an auxiliary jig used for a retainer including a gripping device capable of gripping a rear end of a mandrel bar and a driving device for moving the gripping device forward.
- the cost of the mandrel bar necessary for stretching and rolling can be suppressed.
- FIG. 5 is a front view of the stand in FIG. 4, which is a cross-sectional view taken along line AA in FIG. 4.
- FIG. 6 is a front view of another stand different from FIG. 5 and is a cross-sectional view taken along the line BB of FIG.
- FIG. 10A It is a front view of the support member in FIG. It is a top view of the holding member and mandrel bar of a retainer. It is a longitudinal cross-sectional view of the holding member and mandrel bar shown in FIG. 10A. It is a top view which shows the state in which the mandrel bar was attached to the holding member of FIG. 10A. It is a longitudinal cross-sectional view of the holding member and mandrel bar shown in FIG. 10C. It is a schematic diagram of the rolling mill main body and extractor shown in FIG. It is a schematic diagram for demonstrating "all thickness reduction" in a mandrel mill. It is a schematic diagram for demonstrating "partial outer diameter reduction” in a mandrel mill.
- FIG. 21 is a front view of the auxiliary jig of FIG. 20 and is a cross-sectional view taken along the line CC of FIG. 20. It is a top view of the auxiliary jig
- a front stand group including a plurality of stands arranged from the top along a pass line
- a rear stand group including a plurality of stands arranged behind the front stand group.
- a seamless metal tube is manufactured from a hollow shell using a mandrel mill having the following.
- This method of manufacturing a seamless metal pipe includes a step of preparing a plurality of mandrel bars having different lengths of work parts that are in contact with the hollow shell at the time of stretching and rolling; A step of selecting a mandrel bar having a work part having a length corresponding to the number of stands to be inserted; a step of inserting the mandrel bar selected in the selecting step into the hollow shell; and a hollow shell in which the mandrel bar is inserted Stretching and rolling. And in the process of drawing and rolling, either the front stage stand group or the rear stage stand group performs the outer diameter reduction and the other side performs the thickness reduction, or in either the front stage stand group or the rear stage stand group Carry out wall thickness reduction.
- the mandrel mill not only performs thickness reduction on all the stands, but also performs outer diameter reduction on either the front stand group or the rear stand group.
- stretch rolling in which one of the front stand group and the rear stand group is subjected to outer diameter reduction and the other is subjected to thickness reduction is referred to as “partial outer diameter reduction”.
- stretching rolling that reduces the thickness in both the front stand group and the rear stand group is referred to as “total thickness reduction”.
- the work part When a part of the mandrel mill performs outer diameter reduction, the work part is not required for the stand that performs outer diameter reduction. This is because it is not necessary to contact the inner surface of the hollow shell with the work part under the outer diameter pressure. Therefore, when part of the outer diameter reduction is performed, the work part can be shortened by a length corresponding to the number of stands of the stand group that performs the outer diameter reduction compared to the case of performing full thickness reduction. Good.
- the length of the work part may be a length corresponding to the number of stands for the thickness reduction.
- a plurality of mandrel bars having different work part lengths are prepared in advance, and among the plurality of stands of the mandrel mill, work parts having a length corresponding to the number of stands used for thickness reduction are provided. Use the mandrel bar provided.
- the manufacturing method further includes a step of attaching a rod-shaped auxiliary jig provided with a grip portion at a tip end capable of gripping a rear end portion of the mandrel bar to the rear end of the mandrel bar, and a rear end of the auxiliary jig. And a step of moving the gripping device forward while gripping by the gripping device.
- the length of the mandrel bar can be shortened by using an auxiliary jig. Therefore, the inventory space of the mandrel bar can be reduced, and the cost of the mandrel bar can be reduced.
- the manufacturing method further includes a step of raising a support roll which is disposed between the plurality of stands and the gripping device and can be moved up and down to support the mandrel bar being advanced by the support roll; A step of adjusting the height of the support roll by raising and lowering the support roll based on the advance distance of the auxiliary jig when the outer diameter is different from the outer diameter of the mandrel bar.
- the support roll can be adjusted to an appropriate height for the auxiliary jig.
- the support roll is lowered before the auxiliary jig passes through the support roll.
- the overall lengths of the plurality of mandrel bars may be equal to each other.
- the thickness reduction is performed in the rear stage stand group.
- the final stand of the rear stage stand group performs wall thickness reduction, the total lengths of the plurality of mandrel bars used for stretching rolling are equal to each other.
- the length of the extension part that is a part other than the work part of the mandrel bar and does not come into contact with the hollow shell HS during the drawing and rolling is also changed. Specifically, the shorter the work part, the longer the extension part. Since the material and processing cost of the work part are higher than the extension part, the cost of the mandrel bar can also be suppressed in this case.
- the mandrel mill according to this embodiment is used in the above-described method for manufacturing a seamless metal pipe.
- the mandrel mill includes a plurality of stands and a retainer.
- the plurality of stands are arranged along the pass line and include a plurality of rolls.
- a retainer is arrange
- the retainer includes an auxiliary jig, a gripping device, and a driving device.
- the auxiliary jig includes a grip portion at the front end that can grip the rear end portion of the mandrel bar.
- the gripping device grips the rear end of the auxiliary jig.
- the drive device advances the gripping device along the pass line.
- the mandrel mill according to this embodiment includes an auxiliary jig. Therefore, the total length of the mandrel bar can be shortened. As a result, the cost of the mandrel bar can be reduced.
- the auxiliary jig according to the present embodiment is used in a retainer including a gripping device that can grip the rear end portion of the mandrel bar and a drive device that advances the gripping device.
- the auxiliary jig includes a rod-shaped main body, a grip portion, and an attachment portion.
- the grip portion is disposed at the front end of the main body and grips the rear end portion of the mandrel bar.
- the mounting portion is disposed at the rear end of the main body and has a shape that can be gripped by the gripping device.
- the auxiliary jig according to the present embodiment can be disposed between the mandrel bar and the retainer during the drawing and rolling. Therefore, the length of the mandrel bar can be shortened, and the cost of the mandrel bar can be reduced.
- FIG. 1 is a block diagram for explaining the outline of a seamless metal pipe manufacturing facility according to the present embodiment.
- the seamless metal pipe manufacturing facility manufactures a seamless metal pipe by a so-called Mannesmann mandrel mill method.
- the manufacturing facility of the present embodiment includes a heating furnace 1, a drilling machine 2, and a mandrel mill 3. Between the heating furnace 1, the punching machine 2, and the mandrel mill 3, the conveying apparatus 10 is arrange
- Each conveyance device 10 includes, for example, a plurality of conveyance rollers, and conveys a round billet or a hollow shell.
- the heating furnace 1 stores a solid round billet that is a material of a seamless metal pipe and heats it.
- the punching machine 2 includes a pair of inclined rolls 21 and a plug 22.
- the plug 22 is disposed between the pair of inclined rolls 21 and on the pass line (rolling axis) PL.
- the piercing machine 2 pushes the round billet BL sandwiched between the two inclined rolls 21 into the plug 22 while rotating it in the circumferential direction, and pierces and rolls the round billet BL to form a hollow shell HS. To manufacture.
- the mandrel mill 3 inserts a mandrel bar into the hollow shell HS, and stretch-rolls the hollow shell HS into which the mandrel bar is inserted with a rolling mill body.
- the hollow shell HS stretched and rolled by the mandrel mill 3 is transported to a drawing mill (not shown) after the mandrel bar is pulled out.
- the drawing mill is, for example, a sizer or a reducer.
- the drawing mill draws the hollow shell HS to produce a seamless metal tube.
- FIG. 3 is a block diagram showing the configuration of the mandrel mill 3.
- the mandrel mill 3 includes a retainer 31, a rolling mill main body 32, and an extractor 33.
- the retainer 31, the rolling mill main body 32, and the extractor 33 are arranged in a line.
- the retainer 31 inserts a mandrel bar into the hollow shell HS before the rolling mill body 32 stretches and rolls the hollow shell HS, or pulls out the mandrel bar from the hollow shell HS after stretch rolling.
- the rolling mill main body 32 stretch-rolls the hollow shell HS.
- the extractor 33 is used when the mandrel bar is pulled out from the hollow shell HS after the drawing and rolling.
- each equipment is explained in full detail.
- FIG. 4 is a side view of the rolling mill main body 32 of the mandrel mill 3.
- the rolling mill main body 32 includes a plurality of stands ST1 to STm (m is a natural number) arranged in a line along the pass line PL.
- the total number m of stands is not particularly limited.
- the total number m of stands is 4 to 8, for example.
- each of the stands ST1 to STm includes three rolls RO arranged at 120 ° positions around the pass line PL.
- Each roll RO has a groove GR in which the cross-sectional shape when viewed in a cross section including the central axis thereof is an arcuate shape, and the hole type PA is formed by the grooves GR of the three rolls RO.
- the three rolls RO are arranged by being shifted by 60 ° around the pass line PL.
- the three rolls RO of each stand ST1 to STm are rotationally driven by three motors (not shown).
- the cross-sectional area of the hole-shaped PA formed by the three rolls RO in each stand ST is smaller as that of the rear stage stand than the front stage.
- the hollow shell HS into which the mandrel bar 40 is inserted is stretched and rolled through the stands ST1 to STm along the pass line PL, and the outer diameter and thickness of the hollow shell HS are increased. Be changed.
- each stand STi includes three rolls RO.
- the number of rolls is not limited to only three.
- Each stand STi may have a plurality of rolls RO.
- the number of rolls may be two or four.
- the stand STi includes n rolls (n is a natural number of 2 or more) arranged around the pass line PL, and the n rolls in the rear stage are the stands STi-1 in the front stage.
- the n rolls included in are arranged to be shifted by 180 ° / n around the pass line.
- FIG. 8 is a longitudinal sectional view of the retainer 31.
- the retainer 31 advances the mandrel bar 40 while holding the rear end portion of the mandrel bar 40, and inserts the mandrel bar 40 into the hollow shell HS.
- the retainer 31 further advances the hollow shell HS into which the mandrel bar 40 is inserted along the pass line PL during the drawing and rolling.
- the retainer 31 includes a drive source 311 including a motor and a speed reducer, a drive wheel 312, a driven wheel 313, a chain 314, a plurality of support members 315, and a gripping member 316. Prepare.
- the drive source 311 rotates the drive wheel 312 in the forward direction (clockwise in FIG. 8) and the reverse direction (counterclockwise in FIG. 8).
- the driven wheel 313 is disposed in front of the driving wheel 312 and away from the driving wheel 312.
- the chain 314 is spanned across the drive wheel 312 and the driven wheel 313 to form an endless track.
- the driving source 311, the driving wheel 312, the driven wheel 313, and the chain 314 constitute a driving device that moves the mandrel bar 40 forward or backward by the reference distance Dref.
- FIG. 9 is a front view of the support member 315.
- the two-dot chain line in FIG. 9 represents the mandrel bar 40.
- the support member 315 has an inverted triangular groove 317. The width of the groove 317 gradually decreases from the upper end to the lower end of the support member 315.
- the plurality of support members 315 support the axis of the mandrel bar 40 so as to continue to coincide with the pass line PL while the retainer 31 moves the mandrel bar 40 forward.
- 10A and 10B are a plan view and a longitudinal sectional view of the gripping member 316 and the mandrel bar 40, respectively.
- 10C and 10D are a plan view and a longitudinal sectional view of the gripping member 316 that grips the rear end of the mandrel bar 40.
- the holding member 316 is fixed to the upper surface of the chain 314.
- the gripping member 316 moves forward or backward by the reference distance Dref (between the start position Pstart and the end position Pend) as the chain 314 operates (turns) (see FIG. 8).
- the holding member 316 includes a groove 319 and a hook 318.
- the groove 319 is formed on the upper surface of the gripping member 316 and extends perpendicular to the axial direction of the mandrel bar 40.
- the hook 318 is formed in front of the groove 319 and has a convex shape upward.
- the mandrel bar 40 has a rod shape, and the transverse shape perpendicular to the axis is a circle.
- the mandrel bar 40 includes a neck 410 and a flange 420 at the rear end.
- the neck 410 has a rod-like cross section perpendicular to the axis thereof, and the outer diameter thereof is smaller than the outer diameter of the main body portion of the mandrel bar 40.
- the flange 420 is disposed at the rear end of the neck 410.
- the flange 420 has a disc shape and has an outer diameter larger than that of the neck 410.
- the width of the groove 319 is substantially the same as or slightly larger than the width of the flange 420.
- the bottom surface of the groove 319 is curved in a concave shape in an arc shape.
- a recess 320 into which the neck 410 is fitted is formed on the upper surface of the hook 318.
- the flange 420 is fitted into the groove 319 of the gripping member 316.
- the gripping member 316 grips the mandrel bar 40.
- the gripping member 316 grips the rear end portion (the neck 410 and the flange 420) of the mandrel bar 40 disposed in the hollow shell HS, and is equivalent to the reference distance Dref shown in FIG. ,Advance.
- the drive device drive source 311, drive wheel 312, driven wheel 313, and chain 314
- the retainer 31 moves the gripping member 316 forward by the reference distance Dref.
- the retainer 31 controls the forward speed of the mandrel bar 40 during the drawing and rolling by the rolling mill main body 32.
- the retainer 31 further inserts the mandrel bar 40 into the hollow shell HS before drawing and rolling.
- the retainer 31 further moves the gripping member 316 backward after drawing and rolling, and pulls out the mandrel bar 40 from the drawn and hollow hollow shell HS.
- the retainer 31 described above causes the gripping member 316 to move forward or backward by a drive device that forms an endless track with the chain 314.
- the drive device of the retainer 31 may have other configurations.
- the drive device of the retainer 31 may include a rack and pinion to move the gripping member 316 forward or backward, or may include an electric or hydraulic cylinder, and may be gripped by attaching the gripping member 316 to the tip of the cylinder. Member 316 may be moved forward or backward.
- the extractor 33 includes a plurality of stands SA1 to SAr (r is a natural number) arranged in a line along the pass line PL.
- Each stand SA1 to SAr includes a plurality of rolls arranged at equal intervals around the pass line PL.
- the number of rolls of each stand SA1 to SAn may be 2, 3 or 4.
- the total number of stands r of the extractor 33 is 2 to 4, for example.
- the extractor 33 bites the tip of the hollow shell HS and performs a slight rolling on the tip.
- the retainer 31 reversely rotates the drive wheel 312 to move the gripping member 316 backward. Thereby, the mandrel bar 40 is pulled out backward from the hollow shell HS.
- the extractor 33 is a facility for pulling out the mandrel bar 40.
- the extractor 33 is used to pull out the mandrel bar 40.
- a drawing mill such as a sizer or a reducer may be arranged. Similarly to the extractor 33, these drawing mills also draw the hollow shell. Therefore, similarly to the case where the extractor 33 is used, the mandrel bar 40 can be pulled out from the hollow shell HS.
- Thickness reduction means that when the hollow shell HS comes into contact with the roll RO in the stand STi and is pressed down, the inner surface of the hollow shell HS is pressed down while being in contact with the outer surface of the mandrel bar 40. Means that. In this case, the hollow shell HS is stretched and rolled between the roll RO and the mandrel bar 40, and the wall thickness varies.
- total thickness reduction Since the wall thickness reduction is performed in all the stands ST1 to STm, it is suitable for manufacturing a seamless metal tube having a high rolling load and a seamless metal tube having a high stretch ratio. Drawing and rolling shown in FIG. 12 is referred to as “total thickness reduction”.
- a stand group including a plurality of stands ST1 to STj (j is a natural number, j ⁇ m) arranged continuously from the head (hereinafter referred to as the front stage stand group FST, the outer diameter reduction is performed instead of the thickness reduction, and in the stand group including the stands STj + 1 to STm (hereinafter referred to as the rear stage stand group RST), the thickness reduction is performed.
- the hollow shell HS produced by the punch 2 can be further reduced in diameter under partial outer diameter pressure. Therefore, for example, a hollow shell that has been conventionally rolled to a predetermined outer diameter by the drilling machine 2 can be reduced to the predetermined outer diameter by reducing the outer diameter by the front stand group FST. . Therefore, the outer diameter of the hollow shell to be finished by the punching machine 2 can be made larger than before. In this case, the frequency for exchanging with the inclined roll 21 of the perforator 2 can be lowered according to the outer diameter of the hollow shell to be manufactured. This is because the size to be reduced in diameter by the punching machine 2 can be replaced by the front stand group FST.
- the frequency of exchanging rolls can be reduced by carrying out partial outer diameter reduction, and the degree of freedom of the rolling schedule of the drilling machine 2 and the mandrel mill 3 can be increased.
- the manufacturing process of the seamless metal pipe of the present embodiment can increase the operating rate of the drilling machine 2 and the mandrel mill 3, and as a result, can increase the production efficiency.
- the outer diameter of the hollow shell HS manufactured by the perforator 2 can be further uniformly adjusted by the front stand group FST. Therefore, the dimensional accuracy of the seamless metal pipe can be further increased.
- the stands ST1 to STm of the mandrel mill 3 are divided into a front-stage stand group FST and a rear-stage stand group RST as necessary, and “total thickness reduction” or “partial outer diameter reduction”. To implement. The manufacturing process will be described in detail below.
- FIG. 14 is a flowchart of a method for manufacturing a seamless metal pipe according to the present embodiment.
- the roll distance Droll of each stand ST1 to STm of the mandrel mill 3 (from the center of the pass line PL to the roll RO The distance to the groove GR is set (step S1).
- the setting of step S1 determines whether the mandrel mill 3 reduces the entire thickness or partially reduces the outer diameter. Furthermore, the stands ST1 to STj as the front stage stand group FST are also determined by the setting in step S1 when the outer diameter is partially reduced. In short, the total number of stands j included in the preceding-stage stand group FST can be changed by the setting in step S1. The total number j of the stands included in the front stage stand group FST is determined based on, for example, the steel type and / or the size (outer diameter and thickness) of the seamless metal pipe to be manufactured.
- the roll distance Droll of each stand STi is determined in advance corresponding to the steel type and size (outer diameter and wall thickness) of the seamless metal pipe to be manufactured, for example. These roll distances Droll are recorded in a storage device (HDD or memory) of a computer (not shown) in association with the steel type and size of the seamless metal pipe. By reading the value of the roll distance Droll corresponding to the steel type and size of the manufactured seamless metal pipe from the computer, the roll distance Droll of each of the stands ST1 to STm is adjusted to the value of the roll distance Droll to be set.
- the mandrel bar to be used is selected according to the size (outer diameter dimension and wall thickness dimension) of the seamless metal pipe to be manufactured (step S2).
- a plurality of mandrel bars having different outer diameters are prepared in advance according to the size of the seamless metal pipe.
- a mandrel bar having an appropriate outer diameter is selected from these mandrel bars.
- the round billet is heated in the heating furnace 1 (step S3).
- the round billet may be manufactured by continuous casting, or may be manufactured by rolling an ingot or a slab.
- the heated round billet is pierced and rolled by the piercing machine 2 to manufacture the hollow shell HS (step S4).
- step S5 the mandrel bar 40 selected in step S2 is inserted into the hollow shell HS (step S5).
- the retainer 31 inserts the mandrel bar 40 into the hollow shell HS.
- the hollow shell HS is stretched and rolled by the mandrel mill 3 (step S6).
- the mandrel mill 3 lowers the hollow shell HS by reducing the full thickness or partially by the outer diameter.
- the hollow shell HS is drawn and rolled with a sizer or a reducer to produce a seamless metal tube (step S7).
- the whole wall thickness reduction or partial outer diameter reduction is performed by the mandrel mill 3 according to the steel type and size of the manufactured seamless metal pipe. . Therefore, for a seamless metal pipe of a steel type having a high rolling load and a seamless metal pipe having a high drawing ratio, the entire thickness reduction is performed to enable the mandrel mill 3 to perform rolling. Further, for a seamless metal pipe of a steel type having a low rolling load or a seamless metal pipe having a low drawing ratio, a part of the outer diameter is reduced, and the roll of the rolling mill main body 32 of the drilling machine 2 and the mandrel mill 3 is rolled. The frequency of exchange can be reduced and the degree of freedom of the rolling schedule can be increased. Therefore, the operation rate of the punch 2 and the mandrel mill 3 can be increased, and the production efficiency can be increased.
- the mandrel mill 3 performs “total thickness reduction” or “partial outer diameter reduction”. Therefore, according to the steel type and size of the hollow shell HS, the number of stands for performing thickness reduction in the rolling mill body 32 of the mandrel mill 3 varies. Therefore, in the present embodiment, the mandrel bar 40 is selected according to the number of stands where the thickness reduction is performed.
- FIG. 15 is a side view of the mandrel bar 40.
- the mandrel bar 40 includes a work part 401 and an extension part 402.
- the work part 401 and the extension part 402 are manufactured from different materials and are coaxially coupled to each other.
- the rear end of the work part 401 and the front end of the extension part 402 are threaded, and are joined together by fastening them together.
- the work part 401 and the extension part 402 may be joined by welding instead of being joined by screws, or may be joined by other methods.
- Work part 401 is arranged at the front part of mandrel bar 40.
- the work part 401 is in contact with the inner surface of the hollow shell HS during stretching and rolling. That is, the work part 401 is a part of the mandrel bar 40 that is used for thickness reduction. Since the work part 401 is susceptible to heat from the hollow shell HS and is subject to compressive stress in the thickness direction and tensile stress in the axial direction, the work part 401 is likely to be worn and cracked. Therefore, an expensive material excellent in high temperature strength, heat crack resistance and wear resistance, represented by JIS standard alloy tool steel (SKD), is used for the work part 401.
- JIS standard alloy tool steel JIS standard alloy tool steel
- the accuracy of the thickness of the seamless metal pipe depends on the shape (outer diameter accuracy) of the workpiece 401, and the cleanliness (smoothness) of the inner surface of the seamless metal pipe is the cleanliness of the outer surface of the workpiece 401.
- the work part 401 is required to have a material excellent in mechanical characteristics, high outer diameter accuracy, and outer surface cleanliness. Therefore, the manufacturing cost of the work part 401 is high.
- the extension part 402 is attached to the rear end of the work part 401 coaxially with the work part 401.
- a neck 410 and a flange 420 are formed at the rear end portion of the extension portion 402.
- the extension part 402 does not come into contact with the inner surface of the hollow shell HS during stretching and rolling. Therefore, the extension part 402 is not required to have higher mechanical properties (strength, heat crack resistance and wear resistance), outer diameter accuracy and outer surface cleanliness than the work part 401. Therefore, the extension part 402 can suppress the manufacturing cost by using a material cheaper than the work part 401.
- the outer diameter of the extension part 402 may be smaller than the outer diameter of the work part 401. In this case, the manufacturing cost can be further suppressed.
- the number of stands j included in the front stand group FST may differ depending on the steel type and size of the seamless metal pipe to be manufactured. That is, in the mandrel mill 3, the total number of the stands ST that perform wall thickness reduction varies depending on the steel type and size of the seamless metal pipe.
- a plurality of mandrel bars 40 including work portions 401 having different lengths are prepared in accordance with the number of stands on which thickness reduction is performed.
- a plurality of types of mandrel bars 40 having an outer diameter corresponding to the size of the seamless metal pipe to be manufactured are selected.
- the number of stands for carrying out thickness reduction is determined by the setting of the roll distance Droll in step S1. Therefore, the mandrel bar 40 including the work portion 401 having a length corresponding to the number of stands for performing the thickness reduction is determined as the mandrel bar 40 to be used among the plurality of types of the selected mandrel bars 40 (step S2). ).
- the gripping member 316 of the retainer 31 moves forward to the end point position Pend on the chain 314, at least the leading stand ST1 of the rolling mill body 32
- the mandrel bar 40 including the work part 401 having a length equal to the distance from the entry side position P1in to the exit side position Pmout of the final stand STm is selected.
- the thickness reduction can be performed by using the work part 401 at each of the stands ST1 to STm.
- the extension unit 402 may have a length at least equal to the distance from the end point position Pend to the entry side position P1in.
- the work part 401 is at least equal to the length corresponding to the number of stands ST3 to STm, more specifically, the distance from the entry side position P3in of the stand ST3 to the exit side position Pmout of the final stand STm. It only needs to have a length. And the extension part 402 should just have the length equal to the distance from the end position Pend to the entrance position P3in of 3rd stand ST3 at least.
- the work part 401 when the partial outer diameter reduction is performed may be shorter than the work part 401 when the full thickness reduction is performed. This is because the number of stands where the thickness reduction is performed under partial outer diameter pressure is smaller than the number of stands where the thickness reduction is performed under full thickness pressure. Furthermore, as can be understood from FIG. 17, the work portion 401 of the mandrel bar 40 can be shortened as the number of stands included in the front-stage stand group FST increases under partial outer diameter pressure.
- a plurality of mandrel bars 40 including work portions 401 having different lengths are prepared in advance.
- the length of the work part 401 of each mandrel bar 40 is determined in advance corresponding to the number of stands for performing thickness reduction.
- step S2 in the manufacturing process shown in FIG. 14 the mandrel bar 40 including the work portion 401 having a length corresponding to the number of stands on which thickness reduction is performed is selected.
- the length of the work portion 401 of the mandrel bar 40 used for partial outer diameter reduction can be made shorter than that in the case of full thickness reduction. Since the work unit 401 can use a short mandrel bar, the cost of the mandrel bar 40 necessary for inventory can be reduced.
- a part of the outer diameter is reduced by the front stand group FST. Therefore, although the prepared mandrel bars 40 include the mandrel bars 40 having different lengths of the work parts 401, the total lengths of the plurality of mandrel bars 40 are all equal. This is because, as shown in FIGS. 16 and 17, the final stand STm performs the wall thickness reduction regardless of whether the entire wall thickness is reduced or the outer diameter is partially reduced. Therefore, when the work part 401 is short, the extension part 402 becomes long.
- the outer diameter reduction is performed by the front stage stand group FST partially under the outer diameter reduction.
- the outer diameter reduction may be performed by the rear stage stand group RST (STm-1 and STm).
- the work part 401 of the mandrel bar 40 has at least a length equal to the distance from the entry side position P1in of the leading stand ST1 to the exit side position Pm-2out of the final stand STm-2 of the front stand group FST. That's fine.
- the extension part 402 of the mandrel bar 40 only needs to have a length at least equal to the distance from the end point position Pend to the entry side position P1in of the leading stand ST1.
- the total length of the mandrel bar 40 is sufficient to be equal to the distance from the end point position Pend to the exit side position Pm-2out of the stand STm-2. This is because in the rear stage stand group RST (stands STm-1 and STm) in which the outer diameter is reduced, it is not necessary to insert the mandrel bar 40 into the hollow shell HS to be reduced in outer diameter.
- the final stand (stand STm-2 in FIG. 18) that performs the thickness reduction is the steel type and size of the seamless metal pipe to be manufactured. It changes according to etc.
- the total length of the mandrel bar 40 also changes depending on the position of the final stand where the thickness reduction is performed. More specifically, the smaller the number of stands on which thickness reduction is performed, the shorter the overall length of the mandrel bar 40. Therefore, when the outer diameter is reduced by the rear stage stand group RST, the mandrel bar 40 necessary for inventory can be further shortened.
- the outer diameter reduction is performed by the front stage stand group FST
- the hollow shell HS manufactured by the perforating machine 2 is further reduced in diameter by the front stage stand group FST, and the thickness reduction is performed by the rear stage stand group RST.
- the frequency for exchanging rolls can be suppressed. Therefore, when the outer diameter reduction is performed in the front stage stand group FST, the operation rate of the production line is increased and the production efficiency is increased.
- FIG. 19 is a longitudinal sectional view of the mandrel mill 3 according to the present embodiment. If it demonstrates with reference to FIG. 19, the mandrel mill 3 is newly provided with the auxiliary
- FIG. 20 is a longitudinal sectional view of the auxiliary jig 50 in FIG. 19, FIG. 21 is a sectional view taken along the line CC of FIG. 20, and FIG. 22 is a plan view.
- the auxiliary jig 50 includes a main body portion 51, a grip portion 52, and an attachment portion 53.
- the main body 51 has a rod shape, and preferably has a circular cross section.
- the material of the main body 51 is not particularly limited, but is preferably a metal.
- the grip portion 52 is disposed at the front end of the main body portion 51.
- the grip 52 is fitted with the flange 420 and the neck 410 at the rear end of the mandrel bar 40. That is, the auxiliary jig 50 is coaxially attached to the mandrel bar 40 by the grip portion 52.
- the gripping part 52 includes a groove part 521 and a hook part 522.
- the hook portion 522 is formed in front of the front end surface 511 of the main body portion 51 with a gap from the front end surface 511.
- a groove 523 that fits with the neck 410 is formed on the upper surface of the hook portion 522.
- the groove portion 521 is formed between the hook portion 522 and the front end surface 511 and extends in the transverse direction of the auxiliary jig 50. More specifically, the groove portion 521 extends in an arc shape or an arc shape in the circumferential direction of the auxiliary jig 50.
- the width of the groove 521 is slightly larger than the width of the flange 420. The groove 521 is fitted with the flange 420.
- the grip portion 52 grips the rear end portion of the mandrel bar 40 by the groove portion 521 and the hook portion 522.
- the mounting portion 53 has a shape that can be gripped by the gripping member 316 of the retainer 31.
- the attachment portion 53 has the same shape as the rear end portion of the mandrel bar 40.
- the attachment portion 53 includes a neck 531 and a flange 532.
- the shapes of the neck 531 and the flange 532 are the same as the neck 410 and the flange 420 of the mandrel bar 40.
- the attachment portion 53 is fitted with the grip member 316 of the retainer 31. Thereby, the auxiliary jig 50 is fixed to the gripping member 316.
- the grip 52 of the auxiliary jig 50 grips the rear end (neck 410 and flange 420) of the mandrel bar 40 and is detachably fixed to the mandrel bar 40. Further, the attachment portion 53 of the auxiliary jig 50 is fitted to the gripping member 316 and is detachably fixed to the gripping member 316.
- the auxiliary jig 50 complements the length of the mandrel bar 40.
- the auxiliary jig 50 plays the same role as the extension part 402 and extends the extension part 402. Thereby, the full length of the mandrel bar 40 prepared beforehand can be shortened.
- the shapes of the rear end portions are the same.
- the grip portion 52 of the auxiliary jig 50 can grip the mandrel bar 40 having various sizes (outer diameters). Therefore, the auxiliary jig 50 can be used for a plurality of mandrel bars 40 having different sizes. Therefore, the total length of the plurality of mandrel bars 40 can be shortened.
- the manufacturing process of the seamless metal pipe of this embodiment is as follows. Referring to FIG. 14, the auxiliary jig 50 is attached to the gripping member 316 of the retainer 31 in step S5. Thereafter, the mandrel bar 40 selected in step S ⁇ b> 2 is attached to the auxiliary jig 50. The auxiliary jig 50 is attached to the rear end portion of the mandrel bar 40 through the above steps. The retainer 31 inserts the mandrel bar 40 to which the auxiliary jig 50 is attached into the hollow shell HS. Other operations are the same as those in the first embodiment. The auxiliary jig 50 may be attached to the gripping member 316 after the auxiliary jig 50 is attached to the mandrel bar 40.
- auxiliary jig 50 only one type of auxiliary jig 50 may be prepared, or a plurality of types of auxiliary jigs 50 having different outer diameters may be prepared.
- the optimum mandrel bar 40 and auxiliary jigs 50 are selected in step S2 of FIG.
- the grip portion 52 has one groove portion 521.
- the grip portion 52 may have a plurality of groove portions having different sizes.
- the grip portion 52 has a plurality of groove portions arranged in a line in the axial direction. The closer to the hook portion 522, the smaller the groove portion.
- the grip part 52 can grip a plurality of mandrel bars 40 having different sizes of the rear end part.
- the plurality of grooves are formed corresponding to the respective rear end portions of the plurality of mandrel bars having different sizes. Therefore, mandrel bars having different rear end sizes can be gripped by the gripping portion 52.
- the configuration of the gripping part 52 is not limited to FIGS.
- the grip portion 52 may include an arm that can be opened and closed, and may grip the mandrel bar 40 by opening and closing the arm and sandwiching the rear end portion of the mandrel bar 40 with the arm.
- one auxiliary jig 50 can grip a plurality of mandrel bars 40 having different outer diameters.
- the grip portion 52 may have the same configuration as the grip member 316.
- the outer diameter of the auxiliary jig 50 and the outer diameter of the mandrel bar 40 may be different. Even in such a case, it is preferable that the film can be appropriately drawn and rolled.
- the mandrel mill 3 according to the present embodiment further includes a control device 70 as compared with the second embodiment.
- the control device 70 controls the elevation of the plurality of support rolls SR1 to SRk (k is a natural number).
- the support rolls SR1 to SRk are arranged along the pass line between the retainer 31 and the rolling mill body 32.
- the support roll may be a roll having a flat outer peripheral surface, or may be a V roll having a groove having a triangular transverse shape in the circumferential direction of the outer peripheral surface.
- the support rolls SR1 to SRk are moved up and down by the lifting devices DR1 to DRk.
- the lifting devices DR1 to DRk are, for example, hydraulic cylinders, electric cylinders and the like.
- one lifting device DR is disposed on each support roll SR.
- one lifting device DR may be disposed on the plurality of support rolls SR.
- the controller 70 controls the lifting devices DR1 to DRk to lift and lower the support rolls SR1 to SRk.
- the retainer 31 and the rolling mill main body 32 are separated from each other. Therefore, the mandrel bar 40 may be curved downward between the retainer 31 and the rolling mill main body 32. Such bending affects the stable conveyance of the mandrel bar during rolling and the dimensional accuracy of the hollow shell HS after stretch rolling. Therefore, during the stretching and rolling, the support rolls SR1 to SRk are raised according to the position of the mandrel bar 40 to support the mandrel bar 40 on the pass line PL.
- the outer diameter of the auxiliary jig 50 may be different from the outer diameter of the mandrel bar 40.
- the lower end position of the mandrel bar 40 during stretching and the lower end position of the auxiliary jig 50 are different. If the height of the support roll SR is maintained in accordance with the height of the lower end position of the mandrel bar 40, a gap is generated between the support roll SR and the auxiliary jig 50, or the auxiliary jig 50 is supported by the support roll SR. Or may collide.
- the control device 70 adjusts the height of the support roll according to the movement distance (advance distance) of the auxiliary jig 50 during the drawing and rolling. Specifically, when the outer diameter of the auxiliary jig 50 is larger than the outer diameter of the mandrel bar 40, the elevating device DRq before the auxiliary jig 50 passes through the support roll SRq (q is a natural number of 1 to k). Is controlled to lower the support roll SRq. At this time, the control device 70 may determine the amount of descent based on the difference value between the outer diameter of the auxiliary jig 50 and the outer diameter of the mandrel bar 40. In this case, the support roll SRq can be lowered to the extent that the lowered support roll SRq contacts the lower end of the auxiliary jig 50.
- the elevating device DRq is controlled to raise the support roll SRq.
- the control device 70 may determine the amount of increase based on the difference value between the outer diameter of the auxiliary jig 50 and the outer diameter of the mandrel bar 40.
- the support roll SRq can be raised to the extent that the raised support roll SRq contacts the lower end of the auxiliary jig 50.
- control device 70 adjusts the height of the support roll SRq by moving the support roll SRq up and down according to the moving distance of the auxiliary jig 50. Therefore, it is possible to suppress the auxiliary jig 50 from colliding with the support roll SR.
- control device 70 further raises and lowers support roll SRq in consideration of the outer diameter difference between auxiliary jig 50 and mandrel bar 40. In this case, the auxiliary jig 50 can be supported by the support roll SRq.
- steps S1 to S7 in FIG. 14 are also performed in this embodiment.
- the control device 70 performs the operation shown in FIG. 26 during the drawing and rolling in step S6.
- the control device 70 first reads and compares the outer diameter of the auxiliary jig 50 and the outer diameter of the mandrel bar 40 (step S601). At this time, the control device 70 obtains a difference value between the outer diameter of the auxiliary jig 50 and the outer diameter of the mandrel bar 40. Subsequently, the height of the support roll SRq when the auxiliary jig 50 passes over the support roll SRq is determined (step S602). For each combination of the mandrel bar 40 and the auxiliary jig 50, the control device 70 may manage the height of the support roll SRq in a table in advance and store it in the memory.
- the control device 70 recognizes the start of movement of the mandrel bar 40 and the auxiliary jig 50 (step S603). For example, when the retainer 31 starts to advance the gripping member 316 in the drawing and rolling, the retainer 31 notifies the control device 70 to that effect.
- the control device 70 receives the notification and recognizes the start of movement of the auxiliary jig 50 or the like (step S603).
- Control device 70 raises support roll SRq every time mandrel bar 40 passes support roll SRq (step S604). At this time, the control device 70 determines the rising amount of the support roll SRq according to the size (outer diameter) of the mandrel bar 40.
- the mandrel bar 40 during stretching and rolling is supported by the support rolls SR1 to SRk.
- step S605 the control device 70 reads the examination result of step S601 (step S605).
- the control device 70 maintains the height of the support roll SRq as it is until the drawing and rolling of one hollow shell HS is completed.
- the control device 70 performs a support roll lowering process (step S610). Specifically, the control device 70 checks the current amount of movement of the auxiliary jig 50 (step S611). For example, the control device 70 receives a notification of the movement amount of the gripping member 316 from the retainer 31 every predetermined time, and recognizes the movement amount of the auxiliary jig 50 (advance distance from the start position Pstart).
- the control device 70 Based on the movement amount of the auxiliary jig 50 checked in step S611, when the auxiliary jig 50 comes a predetermined distance before the support roll SR1 (YES in step S612), the control device 70 lowers the support roll SR1. . At this time, the control device 70 may lower the support roll SR1 away from the auxiliary jig 50. The control device 70 may also lower the support roll SR1 so that the support roll SR1 comes into contact with the auxiliary jig 50 based on the outer diameter difference between the auxiliary jig 50 and the mandrel bar 40.
- step S615 After lowering the support roll SR1, the count q is incremented (step S615), and the process returns to step S611. Then, until the count q exceeds k (YES in step S614), that is, the operations of steps S611 to S613 are executed for each of the support rolls SR1 to SRk.
- the control device 70 lowers the support roll SRq. Therefore, it is possible to suppress the auxiliary jig 50 from colliding with the support roll SRq.
- step S620 if the outer diameter of the auxiliary jig 50 is smaller than the outer diameter of the mandrel bar 40, a support roll raising process is performed (step S620).
- the control device 70 checks the current movement amount (advance distance) of the auxiliary jig 50 every predetermined time (step S621).
- the control device 70 Based on the movement amount of the auxiliary jig 50 checked in step 621, when the auxiliary jig 50 passes through the support roll SR1 by a predetermined distance (YES in step S622), the control device 70 raises the support roll SR1 by a predetermined amount. . At this time, the control device 70 raises the support roll SR1 by a predetermined amount so that the support roll SR1 comes into contact with the auxiliary jig 50 based on the outer diameter difference between the auxiliary jig 50 and the mandrel bar 40.
- steps S621 to S623 are performed on the support rolls SR1 to SRk (steps S624 and S625).
- the control device 70 raises the support roll SRq by a predetermined amount and brings the support roll SRq into contact with the auxiliary jig 50.
- the auxiliary jig 50 can move forward without bending downward.
- the control device 70 performs the support roll lowering process S610 and the support roll rising process S620.
- the control device 70 may perform only the support roll lowering process S610.
- the control device 70 may lower the support roll SRq by a certain amount regardless of the outer diameter of the auxiliary jig 50. In this case, at least, the auxiliary jig 50 can be prevented from colliding with the support roll SRq, and more appropriate drawing and rolling can be performed.
- steps S611 to S613 is performed on each of the support rolls SR1 to SRk.
- the plurality of support rolls SR may be lowered at a time.
- all the support rolls SR1 to SRk may be lowered at a time.
- a plurality of support rolls SR1 to SRk are arranged between the retainer 31 and the leading stand ST1 of the rolling mill body 32.
- one or more support rolls may be disposed.
- the support rolls SR1 to SRk are arranged. However, in the first and second embodiments, the support rolls SR1 to SRk may not be provided.
- the mandrel bar 40 is inserted into the hollow shell HS by the retainer 31.
- the mandrel bar 40 may be inserted into the hollow shell HS by other methods.
- the mandrel bar 40 may be inserted into the hollow shell HS using an inserter that is a separate device from the retainer 31.
- the gripping member 316 of the retainer 31 is not limited to the above-described configuration.
- the gripping member 316 may include a plurality of arms that can be opened and closed.
- the gripping member 316 may grip the mandrel bar 40 by sandwiching the rear end portion of the mandrel bar 40 with an arm.
- the rear end portion of the mandrel bar 40 includes the neck 410 and the flange 420.
- the shape of the rear end portion of the mandrel bar 40 is not limited to this. In short, the shape of the rear end portion of the mandrel bar 40 is not particularly limited as long as the grip member 52 and the grip portion 52 of the auxiliary jig 50 can be gripped.
- the mandrel mill has a front-stage stand group and a rear-stage stand group that perform outer diameter reduction or thickness reduction, and stretches and rolls the hollow shell, but the outer diameter reduction and wall thickness reduction are performed.
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Reduction Rolling/Reduction Stand/Operation Of Reduction Machine (AREA)
- Control Of Metal Rolling (AREA)
- Metal Extraction Processes (AREA)
- Forging (AREA)
Abstract
Description
本願は、2012年7月24日に、日本に出願された特願2012-163437号に基づき優先権を主張し、その内容をここに援用する。
(1)本発明に係る第1の態様は、パスラインに沿って先頭から配列された複数のスタンドを含む前段スタンド群と、前記前段スタンド群の後ろに配列された複数のスタンドを含む後段スタンド群とを有するマンドレルミルを用いて、中空素管より継目無金属管を製造する方法であって、延伸圧延時に前記中空素管と接触するワーク部の長さが異なる複数のマンドレルバーを準備する工程と;前記複数のマンドレルバーの中から、肉厚圧下に利用されるスタンド数に応じた長さのワーク部を備えるマンドレルバーを選択する工程と;前記中空素管に、前記選択する工程で選択された前記マンドレルバーを挿入する工程と;前記マンドレルバーが挿入された前記中空素管を延伸圧延する工程と;を備える。この継目無金属管の製造方法は、前記延伸圧延する工程では、前記前段スタンド群及び前記後段スタンド群のいずれか一方で外径圧下を実施して他方で肉厚圧下を実施するか、又は、前記前段スタンド群及び前記後段スタンド群のいずれにおいても肉厚圧下を実施する。
(2)上記(1)の態様において、前記マンドレルバーの後端部を把持可能な把持部を先端に備える棒状の補助治具を、前記マンドレルバーの後端に取り付ける工程と;前記補助治具の後端を把持装置により把持しながら、前記把持装置を前進させる工程と;をさらに備えていてもよい。
(3)上記(2)の態様において、前記複数のスタンドと前記把持装置との間に配置された支持ロールを上昇させて、前進中の前記マンドレルバーを前記支持ロールで支持する工程と;前記補助治具の外径が前記マンドレルバーの外径と異なる場合、前記補助治具の前進距離に基づいて前記支持ロールを昇降させて、前記支持ロールの高さを調整する工程と;をさらに備えていてもよい。
(4)上記(3)の態様において、前記調整する工程では、前記補助治具の外径が前記マンドレルバーの外径よりも大きい場合、前記補助治具が前記支持ロールを通過する前に、前記支持ロールを下降させてもよい。
(5)上記(1)または(2)の態様において、前記延伸圧延する工程では、前記前段スタンド群で外径圧下を実施し;前記複数のマンドレルバーの全長は、互いに等しくてもよい。
(6)本発明に係る第2の態様は、パスラインに沿って配列された複数のスタンドと;前記複数のスタンドのうち、先頭のスタンドの入側に配置され、マンドレルバーの後端部を把持可能な把持部を前端に備える棒状の補助治具と、前記補助治具の後端を把持可能な把持装置と、前記把持装置を前記パスラインに沿って前進させる駆動装置とを備えるリテーナと;を備えるマンドレルミルである。
(7)本発明に係る第3の態様は、マンドレルバーの後端を把持可能な把持装置と、前記把持装置を前進させる駆動装置とを備えるリテーナに用いられる補助治具であって、棒状の本体と;前記本体の前端に配置され、前記マンドレルバーの後端を把持可能な把持部と; 前記本体の後端に配置され、前記把持装置が把持可能な形状の取付部と;を含む。
図1は、本実施形態による継目無金属管の製造設備の概略を説明するためのブロック図である。継目無金属管の製造設備は、いわゆるマンネスマンマンドレルミル方式により継目無金属管を製造する。図1を参照して説明すると、本実施形態の製造設備は、加熱炉1と、穿孔機2と、マンドレルミル3とを備える。加熱炉1と、穿孔機2と、マンドレルミル3との間には、それぞれ、搬送装置10が配置される。各搬送装置10は、たとえば、複数の搬送ローラを備え、丸ビレット又は中空素管を搬送する。
加熱炉1は、継目無金属管の素材である中実の丸ビレットを収納し、これを加熱する。穿孔機2は、図2に示すとおり、一対の傾斜ロール21とプラグ22とを備える。プラグ22は、一対の傾斜ロール21の間であってかつ、パスライン(圧延軸)PL上に配置される。穿孔機2は、両傾斜ロール21により、これらの間に挟んだ丸ビレットBLをその周方向に回転させながらプラグ22に押し込み、丸ビレットBLを穿孔圧延して中空素管(Hollow Shell)HSを製造する。
マンドレルミル3は、中空素管HS内にマンドレルバーを挿入し、マンドレルバーが挿入された中空素管HSを圧延機本体で延伸圧延する。マンドレルミル3により延伸圧延された中空素管HSは、マンドレルバーが引き抜かれた後、図示しない絞り圧延機に搬送される。絞り圧延機は、たとえば、サイザやレデューサである。絞り圧延機は、中空素管HSを絞り圧延し、継目無金属管を製造する。
図4は、マンドレルミル3の圧延機本体32の側面図である。図4を参照して説明すると、圧延機本体32は、パスラインPLに沿って一列に配列される複数のスタンドST1~STm(mは自然数)を備える。スタンド総数mは特に制限されない。スタンド総数mは、たとえば、4~8である。
図8は、リテーナ31の縦断面図である。リテーナ31は、マンドレルバー40の後端部を把持したまま、マンドレルバー40を前進させて、中空素管HS内にマンドレルバー40を挿入する。リテーナ31はさらに、延伸圧延中、マンドレルバー40が挿入された中空素管HSをパスラインPLに沿って前進させる。
図11を参照して説明すると、エキストラクタ33は、パスラインPLに沿って一列に配列される複数のスタンドSA1~SAr(rは自然数)を備える。各スタンドSA1~SArは、パスラインPL周りに等間隔に配置される複数のロールを含む。各スタンドSA1~SAnのロール数は2であってもよいし、3又は4であってもよい。エキストラクタ33のスタンド総数rは、たとえば、2~4である。
本実施形態による継目無金属管の製造方法では、継目無金属管の鋼種及び延伸比に応じて、マンドレルミル3の圧延機本体32において肉厚圧下に使用するスタンド数を変更する。
上述のとおり、マンドレルミル3による延伸圧延では、多数のマンドレルバー40が準備され、在庫される。マンドレルバー40が長いほど、マンドレルバー40の製造コストが高くなる。さらに、マンドレルバー40が長いほど、広い在庫スペースが必要となる。在庫スペースはなるべく小さくできる方が好ましい。
図20は、図19中の補助治具50の縦断面図であり、図21は図20のC-C線より見た断面図であり、図22は平面図である。図20~図22を参照して説明すると、補助治具50は、本体部51と、把持部52と、取付部53とを備える。
補助治具50をサイズの異なる複数のマンドレルバー40に適用する場合、補助治具50の外径とマンドレルバー40の外径が異なる場合が生じる。このような場合であっても、適切に延伸圧延できる方が好ましい。
3 マンドレルミル
31 リテーナ
32 圧延機本体
40 マンドレルバー
50 補助治具
52 把持部
53 取付部
311 駆動源
312 駆動ホイル
313 従動ホイル
314 チェーン
316 把持部材
HS 中空素管
ST1~STm スタンド
FST 前段スタンド群
RST 後段スタンド群
SR1~SRk 支持ロール
Claims (7)
- パスラインに沿って先頭から配列された複数のスタンドを含む前段スタンド群と、前記前段スタンド群の後ろに配列された複数のスタンドを含む後段スタンド群とを有するマンドレルミルを用いて、中空素管より継目無金属管を製造する方法であって、
延伸圧延時に前記中空素管と接触するワーク部の長さが異なる複数のマンドレルバーを準備する工程と;
前記複数のマンドレルバーの中から、肉厚圧下に利用されるスタンド数に応じた長さのワーク部を備えるマンドレルバーを選択する工程と;
前記中空素管に、前記選択する工程で選択された前記マンドレルバーを挿入する工程と;
前記マンドレルバーが挿入された前記中空素管を延伸圧延する工程と;
を備え、
前記延伸圧延する工程では、前記前段スタンド群及び前記後段スタンド群のいずれか一方で外径圧下を実施して他方で肉厚圧下を実施するか、又は、前記前段スタンド群及び前記後段スタンド群のいずれにおいても肉厚圧下を実施する
ことを特徴とする継目無金属管の製造方法。 - 前記マンドレルバーの後端部を把持可能な把持部を先端に備える棒状の補助治具を、前記マンドレルバーの後端に取り付ける工程と;
前記補助治具の後端を把持装置により把持しながら、前記把持装置を前進させる工程と;
をさらに備えることを特徴とする請求項1に記載の継目無金属管の製造方法。 - 前記複数のスタンドと前記把持装置との間に配置された支持ロールを上昇させて、前進中の前記マンドレルバーを前記支持ロールで支持する工程と;
前記補助治具の外径が前記マンドレルバーの外径と異なる場合、前記補助治具の前進距離に基づいて前記支持ロールを昇降させて、前記支持ロールの高さを調整する工程と;
をさらに備えることを特徴とする請求項2に記載の継目無金属管の製造方法。 - 前記調整する工程では、前記補助治具の外径が前記マンドレルバーの外径よりも大きい場合、前記補助治具が前記支持ロールを通過する前に、前記支持ロールを下降させることを特徴とする請求項3に記載の継目無金属管の製造方法。
- 前記延伸圧延する工程では、前記前段スタンド群で外径圧下を実施し;前記複数のマンドレルバーの全長は、互いに等しいことを特徴とする請求項1または2に記載の継目無金属管の製造方法。
- パスラインに沿って配列された複数のスタンドと;
前記複数のスタンドのうち、先頭のスタンドの入側に配置され、マンドレルバーの後端部を把持可能な把持部を前端に備える棒状の補助治具と、前記補助治具の後端を把持可能な把持装置と、前記把持装置を前記パスラインに沿って前進させる駆動装置とを備えるリテーナと;
を備えることを特徴とするマンドレルミル。 - マンドレルバーの後端を把持可能な把持装置と、前記把持装置を前進させる駆動装置とを備えるリテーナに用いられる補助治具であって、
棒状の本体と;
前記本体の前端に配置され、前記マンドレルバーの後端を把持可能な把持部と;
前記本体の後端に配置され、前記把持装置が把持可能な形状の取付部と;
を含むことを特徴とする補助治具。
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BR112015000206A BR112015000206A2 (pt) | 2012-07-24 | 2013-07-18 | método de fabricação de tubulação de metal sem emendas, fresa de mandril e ferramenta auxiliar |
MX2015000371A MX352221B (es) | 2012-07-24 | 2013-07-18 | Método de fabricación de tubo de metal sin costura, tren de mandril y herramientas auxiliares. |
EP13823801.9A EP2878390B1 (en) | 2012-07-24 | 2013-07-18 | Seamless metal tube fabrication method |
JP2013541098A JP5459455B1 (ja) | 2012-07-24 | 2013-07-18 | 継目無金属管の製造方法、マンドレルミル及び補助治具 |
US14/403,241 US9884355B2 (en) | 2012-07-24 | 2013-07-18 | Manufacturing method of seamless metal pipe, mandrel mill, and auxiliary tool |
RU2015103079/02A RU2599931C2 (ru) | 2012-07-24 | 2013-07-18 | Способ изготовления бесшовной металлической трубы, стан для прокатки бесшовных труб на оправке и вспомогательный инструмент |
CN201380035895.6A CN104428073B (zh) | 2012-07-24 | 2013-07-18 | 无缝金属管的制造方法、芯棒式轧管机以及辅助夹具 |
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ITUB20155314A1 (it) * | 2015-10-23 | 2017-04-23 | Danieli Off Mecc | Laminatoio multigabbia per corpi astiformi comprendente gabbie a tre rulli motorizzati |
IT201700023064A1 (it) * | 2017-03-01 | 2018-09-01 | Danieli Off Mecc | Laminatoio per la laminazione di elementi astiformi cavi o comunque concavi |
KR102141689B1 (ko) * | 2020-01-07 | 2020-08-06 | 주식회사 오필 | 관거 보수보강 튜브 와인딩식 제조를 위한 내측 튜브 자동 적재 유닛과 관거 보수보강 튜브 와인딩식 제조 장치 및 방법 |
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- 2013-07-18 BR BR112015000206A patent/BR112015000206A2/pt not_active Application Discontinuation
- 2013-07-18 RU RU2015103079/02A patent/RU2599931C2/ru active
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US20150121982A1 (en) | 2015-05-07 |
EP2878390A1 (en) | 2015-06-03 |
US9884355B2 (en) | 2018-02-06 |
CN104428073A (zh) | 2015-03-18 |
JP5459455B1 (ja) | 2014-04-02 |
MX2015000371A (es) | 2015-11-13 |
RU2015103079A (ru) | 2016-09-10 |
CN104428073B (zh) | 2016-06-01 |
JPWO2014017372A1 (ja) | 2016-07-11 |
EP2878390B1 (en) | 2018-01-31 |
MX352221B (es) | 2017-11-15 |
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BR112015000206A2 (pt) | 2017-06-27 |
EP2878390A4 (en) | 2016-06-15 |
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