CN103962403B - Heavy caliber pipe squeezes to pull out and subtracts wall method - Google Patents

Heavy caliber pipe squeezes to pull out and subtracts wall method Download PDF

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Publication number
CN103962403B
CN103962403B CN201410180287.0A CN201410180287A CN103962403B CN 103962403 B CN103962403 B CN 103962403B CN 201410180287 A CN201410180287 A CN 201410180287A CN 103962403 B CN103962403 B CN 103962403B
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pipe
pull
subtract
subtracts
heavy caliber
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CN103962403A (en
Inventor
雷丙旺
刘海江
李纯毅
刘允书
胡永平
陈建平
杨秀清
白箴
杜红强
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Inner Mongolia North Heavy Industries Group Co Ltd
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Inner Mongolia North Heavy Industries Group Co Ltd
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Abstract

The present invention relates to crowded the pulling out of a kind of heavy caliber pipe and subtract wall method, belong to plastic working field.The present invention acts on pushing force and Drawing Force on pipe simultaneously, the short core print more independent draw of single pass wall cut rate is improved more than 1 times, is brought up to≤45% by≤20%;If simultaneously be equipped with sensing heating, the resistance of deformation of material can be greatly reduced, it is achieved high-strength big-diameter thick-walled seamless steel pipes efficiently subtract wall operation.The present invention can produce external diameter 325 1200mm, wall thickness≤40mm, the heavy caliber pipe of length≤12500mm different size, can be applicable to super (super-) critical electric power unit pipe and copper, the production of Al alloys andMg alloys tubing.The high-pressure boiler tube produced meets ASME SA335, EN10216 2 and GB5310 standard-required, can effectively solve many specifications, small lot heavy caliber pipe efficiently subtracts a wall difficult problem, and tubing is substantially improved subtracts wall efficiency, improves compound material utilization rate, reduces production cost.

Description

Heavy caliber pipe squeezes to pull out and subtracts wall method
Technical field
The present invention relates to crowded the pulling out of a kind of heavy caliber pipe and subtract wall method, belong to plastic working field.
Background technology
High-alloy steel and the tubing such as copper, Al alloys andMg alloys need to use extrusion technique to produce, and the extruding force of tubing with become Material rate is closely related with tube wall thickness.Such as: do raw material, the P91 steel of extruding Φ 550 × 60 × 7500 with the steel ingot of band rising head Pipe, its extruding force 3.0 ten thousand tons, stock utilization 60%, and the extruding force of Φ 550 × 30 × 7500 steel pipe 3.3 ten thousand tons, material are sharp By rate 48%;The extruding force of Φ 550 × 30 × 12500 steel pipe 3.9 ten thousand tons, stock utilization 50%.If can be by the thickness of certain specification Wall pipe is processed into the tubing of relative thin by subtracting wall, for expanding the production capacity of existing equipment, improving stock utilization tool Significant.Cold-drawing process can produce the minor diameter thin wall tubing that other production form cannot obtain, and has drawbench knot Structure is simple, easy to manufacture, small investment, and product variety is many, and scope is wide, changes flexibly, the advantages such as instrument consumption is few.Although cold-drawn work Skill is divided long top draw, short top draw, the kinds of processes form such as is pulled out without top draw and expansion, but it is the most relatively low to subtract wall efficiency.And The hot-expanding pipe technology risen in recent years, can play while expanding and certain subtract wall effect, but this technique is by deformation process Stress state limitation, its product can not apply to important bearing carrier.
Therefore, on the basis of existing draw technology, carry out technological innovation, keep drawing equipment small investment, product quality On the premise of good, applicable Multi-varieties and Small-batch Production, it is substantially improved and subtracts the realistic problem that wall efficiency is a urgent need solution.
Summary of the invention
It is an object of the invention to the limitation for tradition draw technology, pipe act on pushing force and pulling capacity simultaneously, The applicable Multi-varieties and Small-batch Production of formation one, small investment, the measured heavy caliber pipe of matter squeeze to pull out and subtract wall method.
Technical solution:
The present invention acts on pushing force and pulling capacity on pipe simultaneously, squeezes and pulls out wall cut rate more independent draw raising more than 1 times, Up to 45%.
Heavy caliber pipe squeezes to pull out and subtracts wall method, it is characterised in that at wall thickness δ0Pipe on act on pushing force F simultaneously1With draw Pull out force F2, pipe is subtracted wall to δ1, short core print single pass wall cut rate η=[(δ01)/δ0] more independent draw improves more than 1 times, high Reach 45%.
Heavy caliber pipe squeezes to pull out and subtracts wall method, comprises the steps:
1) to certain specification wall thickness δ0Pipe carry out termination pretreatment, the pipe wall thickness δ after process1;Pretreatment segment length Degree ensures the die orifice >=100mm of pipe head extrusion die, and draw bearing holes processed in pretreatment section;
2) pipe of crowded withdrawing pattern, core bar and termination pretreatment is positioned, only at pipe caudal action pushing force, by pipe head Portion's extrusion squeezes the die orifice >=100mm of withdrawing pattern mould;
3) by the pipe head of extrusion mould-outlet draw jaw interlinear notes, simultaneously at pipe caudal action pushing force F1, pipe Base head effect Drawing Force F2, draw speed is mated on request with pushing speed, is completed tubing and efficiently subtract wall operation.
Further: by pipe head extrusion mould-outlet >=100mm, push speed >=5mm/s.
Further: wall thickness δ0Pipe and crowded withdrawing pattern tool with core print between be lubricated, coefficient of friction≤0.12.
Further: to squeeze withdrawing pattern tool modular angle α and core print tapering β for 15-45, and α=β.
Employing present invention preserves draw technical equipment simple in construction, small investment, and product variety is many, changes flexibly etc. excellent Point.Apply to squeeze thrust while draw, overcome the excessive Materials Fracture problem caused of Drawing Force, be greatly improved and subtract wall effect Rate, the effectively many specifications of solution, small lot heavy caliber pipe efficiently subtract a wall difficult problem.High for improving such as super (super-) critical unit The tubing compound material utilization rates such as end heavy caliber seamless steel pipe, reduction production cost are significant.
Accompanying drawing explanation
Fig. 1 is present configuration schematic diagram;
Result figure when Fig. 2 is only to act on extruding force on pipe;
Result figure when Fig. 3 is only to act on Drawing Force on pipe;
Result figure when Fig. 4 is to act on pushing force and pulling capacity on pipe simultaneously.
Detailed description of the invention
Embodiment 1
Produce the P91 material tubing of φ 550 х 30 х 12500mm
1, the P91 pipe 1 that (maybe can manufacture) meets the φ 560 х 50 х 7500mm that technology requires is selected;
2, head pretreatment, by pipe 1 head, (length l) is processed into φ 550 х 30 mm, processing sections and undressed section of cone Degree 15-45 transition;
3, the pipe 1 of crowded withdrawing pattern 3, core bar 2 and termination pretreatment is positioned, only at pipe 1 caudal action pushing force, will pipe Base head extrusion mould-outlet >=100mm, pushes speed >=5mm/s;
4, by the pipe head of extrusion mould-outlet draw jaw interlinear notes, simultaneously at pipe caudal action pushing force, at pipe Head effect Drawing Force, pushes speed >=5mm/s, and draw speed is mated on request with pushing speed, completes tubing and efficiently subtracts wall Operation;Squeeze and during pulling out, pipe predeformation district is carried out sensing heating, heating-up temperature 800-1000 DEG C;
5, the tubing subtracting wall thickness is made annealing treatment;
6, Tempering and Quenching;
7, finishing;
8, Non-Destructive Testing;
9, the φ 550 х 30 х 12500mm seamless steel pipe of quality criteria requirements it is met.
As follows by forging Software Numerical Simulation analysis result:
Only acting on extruding force, wall thickness is reduced to 30mm by 50mm by 1 passage, can produce material stacking, it is impossible to realizes subtracting wall and makees Industry, is shown in Fig. 2.Only acting on Drawing Force, wall thickness is reduced to 30mm by 50mm by 1 passage, can produce material and break, it is impossible to realize subtracting wall Operation, is shown in Fig. 3.When applying the method according to the invention, 1 passage wall thickness can be reduced to 30mm by 50mm, see Fig. 4.
The present invention acts on pushing force and pulling capacity on pipe simultaneously, squeezes and pulls out wall cut rate more independent draw raising more than 1 times, Up to 45%.
Use the present invention can produce external diameter 325 1200 mm, wall thickness≤40mm, length≤12500 mm different size big Caliber pipe material, can be applicable to supercritical electric power unit pipe and the tubing such as copper, Al alloys andMg alloys produces.The employing present invention produces High-pressure boiler tube meet the standard-requireds such as ASME SA335, EN10216-2 and GB5310.The present invention originally can effectively solve many Specification, small lot heavy caliber pipe efficiently subtract a wall difficult problem, and tubing is substantially improved subtracts wall efficiency, improves compound material utilization rate, Reduce production cost.

Claims (1)

1. heavy caliber pipe squeezes to pull out and subtracts wall method, it is characterised in that wall thickness δ0Pipe on act on pushing force F simultaneously1And pulling capacity F2, by pipe wall thickness reduction to δ1, short core print single pass wall cut rate η=[(δ01)/δ0] more independent draw improve more than 1 times, reach 45%;
Tubing squeezes and pulls out that to subtract wall method step as follows:
1) draw bearing holes is prepared: pipe (1) termination, one end that original specification is φ 560 × 50 × 7500mm is carried out pre-place Reason, the pipe termination wall thickness after process is 30mm, and pretreatment section length ensures that the die orifice of the crowded withdrawing pattern (3) of pipe head extrusion is the least In 100mm, and in pretreatment section, prepare draw bearing holes, 15 °~45 ° of tapering mistakes between pretreatment section and non-pretreatment section Cross;
2) will wall pipe (1) be subtracted, core bar (2) and crowded withdrawing pattern (3) location, squeeze modular angle α of withdrawing pattern and core print tapering β at 15 °~ 45 °, and α=β;
3) to wall thickness δ0Pipe and crowded withdrawing pattern and core print between be lubricated, it is ensured that squeeze to pull out and subtract pipe and crowded withdrawing pattern during wall And coefficient of friction≤0.12 between core print;
4) squeeze to pull out to subtract and the sensing of pipe predeformation district is heated to 800~1000 DEG C, simultaneously at pipe (1) caudal action during wall Pushing force F1, in pipe head effect pulling capacity F2, push speed >=5mm/s, drawing speed and pushing speeds match, it is achieved nothing Seam steel pipe squeezes to pull out and subtracts wall;
5) by squeeze pull out subtract the seamless steel pipe of wall carry out annealing, Tempering and Quenching;
6) subtract the seamless steel pipe of wall carry out finishing by squeezing to pull out;
7) subtract the seamless steel pipe of wall carry out Non-Destructive Testing by squeezing to pull out;
8) φ 550 × 30 × 12500mm seamless steel pipe of quality criteria requirements it is met.
CN201410180287.0A 2014-05-02 2014-05-02 Heavy caliber pipe squeezes to pull out and subtracts wall method Active CN103962403B (en)

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Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104607467A (en) * 2014-12-27 2015-05-13 内蒙古北方重工业集团有限公司 Large-bore-diameter high-alloy blank bearizing method
CN106040765A (en) * 2016-06-28 2016-10-26 邯郸新兴特种管材有限公司 Steel pipe drawing device and low-cost pipe drawing process based on device
CN208276023U (en) * 2018-05-15 2018-12-25 句容百利镁合金材料科技有限公司 A kind of magnesium alloy thickness pipe tube drawing machine structure
CN109883944A (en) * 2019-02-27 2019-06-14 长沙理工大学 A kind of test device of drawing deformation coefficient of friction

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DE19711029A1 (en) * 1997-03-17 1998-09-24 Bueltmann Monika Drive for a pipe drawing machine
CN103357696A (en) * 2013-07-18 2013-10-23 中铝洛阳铜业有限公司 Production manufacturing process of large-diameter copper-nickel alloy seamless pipe

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JPS61219418A (en) * 1985-03-26 1986-09-29 Sumitomo Light Metal Ind Ltd Expanding and drawing method of metal pipe
CN101219440B (en) * 2008-01-28 2010-09-08 江苏龙城洪力液压设备有限公司 Drawing vehicle of cold drawing machine and draw-production technique for metallic tube
CN102049424B (en) * 2010-11-10 2012-05-30 江苏华程工业制管股份有限公司 Push device for cold drawing
CN202045287U (en) * 2011-05-06 2011-11-23 金川集团有限公司 Pipe pushing type pipe expanding drawing head-making device
CN203030656U (en) * 2012-12-31 2013-07-03 刘选萍 Reducing pipe expansion drawing forming device

Patent Citations (2)

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Publication number Priority date Publication date Assignee Title
DE19711029A1 (en) * 1997-03-17 1998-09-24 Bueltmann Monika Drive for a pipe drawing machine
CN103357696A (en) * 2013-07-18 2013-10-23 中铝洛阳铜业有限公司 Production manufacturing process of large-diameter copper-nickel alloy seamless pipe

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