CN107695102A - A kind of method for preventing to block after thick-walled pipe roll piercing - Google Patents

A kind of method for preventing to block after thick-walled pipe roll piercing Download PDF

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Publication number
CN107695102A
CN107695102A CN201711002147.4A CN201711002147A CN107695102A CN 107695102 A CN107695102 A CN 107695102A CN 201711002147 A CN201711002147 A CN 201711002147A CN 107695102 A CN107695102 A CN 107695102A
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CN
China
Prior art keywords
thick
walled pipe
piercing
roll
blank
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CN201711002147.4A
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Chinese (zh)
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CN107695102B (en
Inventor
庞玉华
吴威
罗远
康荻娜
林鹏程
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Xian University of Architecture and Technology
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Xian University of Architecture and Technology
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Priority to CN201711002147.4A priority Critical patent/CN107695102B/en
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    • BPERFORMING OPERATIONS; TRANSPORTING
    • B21MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21BROLLING OF METAL
    • B21B19/00Tube-rolling by rollers arranged outside the work and having their axes not perpendicular to the axis of the work
    • B21B19/02Tube-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, Stiefel rotary piercers
    • B21B19/04Rolling basic material of solid, i.e. non-hollow, structure; Piercing, e.g. rotary piercing mills

Abstract

The present invention discloses a kind of method for preventing to block after thick-walled pipe roll piercing, comprises the following steps:1), the thick-walled pipe tube blank size needed for, blank and top diameter are determined;2) blank, is heated to start rolling temperature in heating furnace;3) bar after, being heated on tapered roller Mannesmann piercing machine according to the Mannesmann piercing mill parameter of setting to step 2) carries out roll piercing.The present invention realizes being smoothed out for the thick-walled pipe roll piercing process that radius-thickness ratio is 3.5~7.5 on tapered roller Mannesmann piercing machine.Do not occur coming directly towards in the punch off stage do not pass, the rear card problem such as bag tail, reduce top abrasion, improve rolling rhythm, the thick-walled pipe pipe evenness of wall thickness obtained is good.

Description

A kind of method for preventing to block after thick-walled pipe roll piercing
Technical field
The invention belongs to tubular object extruding technical field, more particularly to a kind of production work for preventing to block after thick-walled pipe roll piercing Skill.
Background technology
Card refers to occur to roll card what pipe afterbody metal gradually left the unstable stage of deformed area afterwards, as thick-walled pipe The problem of most commonly seen during roll piercing, it is mainly shown as:(1) top is not exposed, and it is round end and end to roll card division position Portion is recessed;(2) top is exposed a part or is completely exposed, but band does not discharge.
It is after appearance the main reason for card problem:(1) top serious wear in perforation procedure, or even part occur and melt Change phenomenon, make top and blank glutinous together with, bag top phenomenon occurs, blocks after formation;(2) after pipe tail end enters deformed area, It is gradually reduced with roll contact area, onward impulse weakens, although top has passed, can not depart from blank.
The content of the invention
It is an object of the invention to provide a kind of method for preventing to block after thick-walled pipe roll piercing, to solve thick-walled pipe oblique milling The problem of blocking after perforation.The present invention, can be effective by improving expanding amount and asynchronous region length in during roll piercing The top degree of wear is reduced, avoids the punch off stage onward impulse deficiency the problem of, wearing in oblique milling so as to solve thick-walled pipe Rear card problem during hole, improve production efficiency and stock utilization.
To achieve the above object, the present invention adopts the following technical scheme that:
A kind of method for preventing to block after thick-walled pipe roll piercing, comprises the following steps:
1), the thick-walled pipe tube blank size needed for, blank and top diameter are determined;
2) blank, is heated to start rolling temperature in heating furnace;
3) rod after, being heated on tapered roller Mannesmann piercing machine according to the Mannesmann piercing mill parameter of setting to step 2) Material carries out roll piercing.
Further, thick-walled pipe pipe radius-thickness ratio is 3.5~7.5 in step 1), comes directly towards outside diameter dtFor hollow billet internal diameter dm's 0.9~0.95 times, blank outer diameter DpFor capillary outer diameter Dm0.94~0.96 times.
Further, heating-up temperature is 450 DEG C~1200 DEG C in step 2).
Further, the material of blank is carbon constructional quality steel, high-alloy steel, titanium alloy, aluminium alloy or other coloured Metal and alloy.
Further, the feed angle β of Mannesmann piercing mill is controlled in the range of 8 °~15 ° in step 3), and roll off angle γ is 15 °, diameter reduction ratio ε is controlled in the range of 8%~10%, top front reduction ratio εdqIn the range of 6%~7%, pass is ellipse for control Roundness coefficient is 1.1~1.15.
Further, top length l accounts for the 50%~56% of blank deformation section length L in step 3), and asynchronous region length L leads to Cross following formula calculating:
Wherein,For roll entrance cone angle,For roll exit cone angle, DckFor gap values between rollers.
Due to using technical scheme as described above, the present invention produces following good effect:
The present invention adds the length of circle gauging zone, makes punch off rank by the adjustment to technological parameter and top shape The problem of being short of power of section is improved;Expanding amount in material is improved in perforation procedure, significantly reduces top Abrasion, smoothly entering for the thick-walled pipe roll piercing process that radius-thickness ratio is 3.5~7.5 is realized on tapered roller Mannesmann piercing machine OK.Do not occur coming directly towards in the punch off stage do not pass, the rear card problem such as bag tail, the thick-walled pipe pipe evenness of wall thickness obtained Well.
Brief description of the drawings
Fig. 1 is perforation deformed area schematic diagram;
Fig. 2 is TC4 thick-walled pipes cross section in embodiment 1;
Fig. 3 is 45 steel thick-walled pipe cross sections in embodiment 2;
Fig. 4 is 2219 thick-wall aluminum alloy pipe cross sections in embodiment 3.
Embodiment
Refer to shown in Fig. 1, a kind of method for preventing to block after thick-walled pipe roll piercing, comprise the following steps:
1), the thick-walled pipe tube blank size needed for, blank and top diameter are determined;
2) blank, is heated to start rolling temperature in heating furnace;
3) rod after, being heated on tapered roller Mannesmann piercing machine according to the Mannesmann piercing mill parameter of setting to step 2) Material carries out roll piercing.
Thick-walled pipe pipe radius-thickness ratio is 3.5~7.5 in step 1), and due to expanding phenomenon in perforation procedure be present, top is outer Footpath dtFor hollow billet internal diameter dm0.9~0.95 times, blank outer diameter DpFor capillary outer diameter Dm0.94~0.96 times.
It is different according to material category in step 2), in the range of 450 DEG C~1200 DEG C of its heating-up temperature, the material bag of blank Include:The nonferrous metal and alloy such as carbon constructional quality steel, high-alloy steel (containing stainless steel) and titanium alloy and aluminium alloy.
The feed angle β of Mannesmann piercing mill is controlled in the range of 8 °~15 ° in step 3), and roll off angle γ is 15 °, diameter pressure Rate ε is controlled in the range of 6%~12%, top front reduction ratio εdqControl is in the range of 4%~7%, Groove Ovality Factor 1.1 ~1.15.Top length l accounts for the 50%~56% of asynchronous region length L, and asynchronous region length L is calculated by following formula:
Wherein,For roll entrance cone angle,For roll exit cone angle, DckFor gap values between rollers.
Embodiment 1
On TC4 alloy forging stocks machined method obtain size for Φ 45 × 200mm bars as original blank.Bar Through tapered roller roll piercing after 960 DEG C of removal surface scales, punch rotating speed is 70r/min, feed angle and roll off angle It it is 15 °, it is 20 × 40mm of Φ that size is come directly towards in perforation procedure, diameter reduction ratio 10%, top front reduction ratio 6%, after perforation Pipe carries out air cooling at ambient temperature, obtains the thick-walled pipe that length is 223mm.
Rolled piece after rolling, radially section points 120 ° respectively take three lines, as shown in figure 1, measuring its diameter respectively and making even Average, table 1 show the physical dimension deviation after the perforation of TC4 bars.As a result show that obtained product external diameter average value is 47.4, internal diameter average value is 22.2, and pipe radius-thickness ratio is 3.76.
Table 1
Section External diameter (mm) Internal diameter (mm) Wall thickness (mm)
1-1 47 21.8 12.6
2-2 47.5 22.5 12.5
3-3 47.8 22.3 12.75
Average value 47.4 22.2 12.6
Embodiment 2
It is machined on its forging stock to obtain the bar that size is 50 × 800mm of Φ using 45 steel as blank.Through box Resistance furnace is heated to after 1200 DEG C the diameter reduction ratio 9% in the enterprising eleven punch 11 of tapered roller Mannesmann piercing mill, perforation procedure, top Preceding reduction ratio 7%, comes directly towards size 25 × 50mm of Φ, and remaining parameter is same as Example 1.Obtained thick-walled pipe pipe is in room temperature bar Air cooling is carried out under part, obtains hollow billet length 871mm, external diameter 54.5mm, internal diameter 26mm, radius-thickness ratio 3.9.
Embodiment 3
By 2219 aluminium alloys it is machined obtain size be 48 × 800mm of Φ bar, 450 DEG C are heated in heating furnace Afterwards, perforated through tapered roller Mannesmann piercing mill, punch rotating speed be 35r/min, 8 ° of feed angle, 15 ° of roll off angle, in perforation procedure directly Footpath reduction ratio is 8%, top front reduction ratio 6%, top 20 × 50mm of size Φ.The hollow billet length 870mm obtained after air cooling, outside Footpath 51mm, internal diameter 22mm, radius-thickness ratio 3.5.

Claims (6)

  1. A kind of 1. method for preventing to block after thick-walled pipe roll piercing, it is characterised in that comprise the following steps:
    1), the thick-walled pipe tube blank size needed for, blank and top diameter are determined;
    2) blank, is heated to start rolling temperature in heating furnace;
    3) bar after, being heated on tapered roller Mannesmann piercing machine according to the Mannesmann piercing mill parameter of setting to step 2) enters Row roll piercing.
  2. 2. a kind of method for preventing to block after thick-walled pipe roll piercing according to claim 1, it is characterised in that in step 1) Thick-walled pipe pipe radius-thickness ratio is 3.5~7.5, comes directly towards outside diameter dtFor hollow billet internal diameter dm0.9~0.95 times, blank outer diameter DpFor hair Pipe outer diameter Dm0.94~0.96 times.
  3. 3. a kind of method for preventing to block after thick-walled pipe roll piercing according to claim 1, it is characterised in that in step 2) Heating-up temperature is 450 DEG C~1200 DEG C.
  4. A kind of 4. method for preventing to block after thick-walled pipe roll piercing according to claim 1, it is characterised in that the material of blank Matter is carbon constructional quality steel, high-alloy steel, titanium alloy, aluminium alloy or other nonferrous metal and alloys.
  5. 5. a kind of method for preventing to block after thick-walled pipe roll piercing according to claim 1, it is characterised in that in step 3) The feed angle β of Mannesmann piercing mill is controlled in the range of 8 °~15 °, and roll off angle γ is 15 °, diameter reduction ratio ε controls 8%~ In the range of 10%, top front reduction ratio εdqIn the range of 6%~7%, Groove Ovality Factor is 1.1~1.15 for control.
  6. 6. a kind of method for preventing to block after thick-walled pipe roll piercing according to claim 1, it is characterised in that in step 3) Top length l accounts for the 50%~56% of blank deformation section length L, and asynchronous region length L is calculated by following formula:
    Wherein,For roll entrance cone angle,For roll exit cone angle, DckFor gap values between rollers.
CN201711002147.4A 2017-10-24 2017-10-24 A method of block after preventing thick-walled pipe roll piercing Active CN107695102B (en)

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CN107695102B CN107695102B (en) 2019-04-02

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110252813A (en) * 2019-03-15 2019-09-20 西北工业大学 A kind of Mannesmann piercing method of the solid bar stock of nickel base superalloy
CN110252814A (en) * 2019-03-18 2019-09-20 西北工业大学 A kind of Mannesmann piercing method of titanium alloy solid bar stock

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2010005679A (en) * 2008-06-30 2010-01-14 Sanyo Special Steel Co Ltd Shape of punch of centering device
CN103146956A (en) * 2013-03-26 2013-06-12 武汉武船机电设备有限责任公司 Titanium alloy pipe and manufacturing method
CN203886934U (en) * 2014-05-05 2014-10-22 沧州屹城钢管制造有限公司 Hole expanding device applied to perforating of seamless steel tube
CN105478478A (en) * 2015-11-19 2016-04-13 扬州诚德钢管有限公司 Process for forming large-diameter seamless thick-wall and extra-strong steel pipes
CN105689409A (en) * 2016-02-03 2016-06-22 西安建筑科技大学 Method for controlling tail wiggling quantity of inclined rolling perforator

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2010005679A (en) * 2008-06-30 2010-01-14 Sanyo Special Steel Co Ltd Shape of punch of centering device
CN103146956A (en) * 2013-03-26 2013-06-12 武汉武船机电设备有限责任公司 Titanium alloy pipe and manufacturing method
CN203886934U (en) * 2014-05-05 2014-10-22 沧州屹城钢管制造有限公司 Hole expanding device applied to perforating of seamless steel tube
CN105478478A (en) * 2015-11-19 2016-04-13 扬州诚德钢管有限公司 Process for forming large-diameter seamless thick-wall and extra-strong steel pipes
CN105689409A (en) * 2016-02-03 2016-06-22 西安建筑科技大学 Method for controlling tail wiggling quantity of inclined rolling perforator

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110252813A (en) * 2019-03-15 2019-09-20 西北工业大学 A kind of Mannesmann piercing method of the solid bar stock of nickel base superalloy
CN110252814A (en) * 2019-03-18 2019-09-20 西北工业大学 A kind of Mannesmann piercing method of titanium alloy solid bar stock

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