CN106216415B - Improve the vertical hot extrusion process evenness of wall thickness method of large-sized heavy-wall tube - Google Patents
Improve the vertical hot extrusion process evenness of wall thickness method of large-sized heavy-wall tube Download PDFInfo
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- CN106216415B CN106216415B CN201610589965.8A CN201610589965A CN106216415B CN 106216415 B CN106216415 B CN 106216415B CN 201610589965 A CN201610589965 A CN 201610589965A CN 106216415 B CN106216415 B CN 106216415B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
- B21C23/00—Extruding metal; Impact extrusion
- B21C23/01—Extruding metal; Impact extrusion starting from material of particular form or shape, e.g. mechanically pre-treated
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
- B21C23/00—Extruding metal; Impact extrusion
- B21C23/02—Making uncoated products
- B21C23/04—Making uncoated products by direct extrusion
- B21C23/08—Making wire, bars, tubes
- B21C23/085—Making tubes
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
- B21C23/00—Extruding metal; Impact extrusion
- B21C23/32—Lubrication of metal being extruded or of dies, or the like, e.g. physical state of lubricant, location where lubricant is applied
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
- B21C29/00—Cooling or heating work or parts of the extrusion press; Gas treatment of work
- B21C29/04—Cooling or heating of press heads, dies or mandrels
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
- B21C31/00—Control devices, e.g. for regulating the pressing speed or temperature of metal; Measuring devices, e.g. for temperature of metal, combined with or specially adapted for use in connection with extrusion presses
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Extrusion Of Metal (AREA)
Abstract
One kind improves the vertical hot extrusion process evenness of wall thickness method of large-sized heavy-wall tube, belongs to the hot-pressed technical field of large-sized heavy-wall tube.Processing step and the technical parameter controlled are：Given shape is processed into pipe one end to be extruded；Mold preheating temperature：For heat-resisting steel material, 400~450 DEG C of mold preheating temperature；For heat-resisting alloy material, 350~400 DEG C of mold preheating temperature；Control pipe extruding lower limit temperature：For heat-resisting steel material, 1000~1010 DEG C of extruding lower limit temperature scope；For heat-resisting alloy material, 1030~1040 DEG C of extruding lower limit temperature scope；Rational glass lubricant type and granularity are selected according to diverse location crumpling behavior.Advantage is：The metal uniformity flowing of stable extrusion process pipe is substantially improved, significantly improves large-sized heavy-wall tube extrusion process evenness of wall thickness.
Description
Technical field
The invention belongs to the hot-pressed technical field of large-sized heavy-wall tube, and it is thick in particular, provide a kind of raising heavy caliber
The vertical hot extrusion process evenness of wall thickness method of wall pipe, suitable for the preparation of large-diameter thick-walled pipeline.
Background technology
At present, ultra supercritical station boiler is external diameter Φ 273mm~1066mm with heavy caliber thick wall seamless pipe specification, wall thickness
20mm~130mm.China produces heavy caliber thick wall heat resisting pipe and heat-resisting alloy pipe mainly uses vertical hot-extrusion method, with biography
System method is compared, and the method has a clear superiority, and refers to the B of patent CN 101706019.China has more than 30,000 ton forces large-scale
Vertical extruder number platform, the technical monopoly of foreign countries is broken, has developed the heavy caliber thick wall seamless steel with independent intellectual property right
Pipe manufacturing process and technology, China can be fully met in industries such as electric power, petrochemical industry, ship, military project, machineries to large-calibre seamless pipe
Demand.Although China possesses the manufacturing technology of production heavy caliber thick wall heat resisting pipe and heat-resisting alloy pipe, still go out in practice
Existing more problem.Some problems have been resolved and improved, and some major issues do not find solution yet so far.
Vertical hot extrusion process is to prepare the key link in large-sized heavy-wall tube technique, is not only related to extrusion equipment
Safety, and it is directly connected to inner and outer surfaces quality, evenness of wall thickness and structural state and production efficiency of extruded tube etc..
The B of patent CN 103938134 " method for improving heat-resisting alloy heavy wall extruded tube radial direction structural homogenity "：Pass through reality
Existing pipe radial direction temperature difference, improves the radial direction structural homogenity of heavy wall (＞ 30mm) extruded tube, and then improves heavy caliber thick wall
The uniformity of pipe radial performance.
The B of patent CN 104259233 " a kind of heavy caliber thick wall heat-resisting alloy pipe is without discard pressing method "：By in pipe
Specific discard pad is placed between movable extrusion mold, the continuity of hot extrusion tubing production process is improved, reduces production cost.
During producing tubes by squeezing, the wall thickness of extruding pipe is determined by the gap between plug and extrusion die.In producing tubes by squeezing
In technology development course, the extruding plug at initial stage is fixed, referred to as stationary core rod.In extrusion process, although inside pipe wall and core
Rod outer surface sprays or roller coating glass powder lubricant, but inside pipe wall remains relative motion with stationary core rod outer surface, and
And both temperature differences are larger, easily there is serious V-type crackle in inside pipe wall, and crack depth is deeper.To improve table in extruded tube
Face quality, servo-actuated plug is changed to by stationary core rod, i.e., in extrusion process, extruding inside pipe wall together with servo-actuated plug outer surface to
Upper motion, between the two relative motion degree reduce, substantially improve the inner surface quality of extruded tube.
In large-scale vertical extruder tube-making technology more than 30,000 ton forces, servo-actuated plug technology is also used, its object is to
Control large-diameter pipe inner surface quality, still, when extruding pipe wall thickness dimension is more than 70mm, extruding large-sized heavy-wall tube when will
There is wall unevenness phenomenon, see schematic diagram 1, and require that the specification wall thickness of production tube is thicker, extruded tube wall unevenness phenomenon is got over
Seriously.
When vertical hot extrusion large-sized heavy-wall tube produces wall unevenness, many adverse effects will be brought：
(1) when producing wall unevenness, pipe metal has produced imperfect flow, and extruding force will significantly rise when continuing extruding
Height, while axial symmetry both sides unbalance stress is extruded, extruding force is bigger, more fragile auxiliary equipment and extrusion die.
(2) when producing wall unevenness, extruding pipe will be bent, extruded tube after bending not easy mold release, it is difficult to which pipe is smooth
Hang out, rhythm of production certainly will be upset, and subsequent extrusion pipe must also carry out aligning process, take a lot of work and time-consuming.
(3) when producing wall unevenness, to ensure finished product pipe size, it is necessary to increase follow-up amount of machining, product lumber recovery
Reduce；If wall thickness is seriously uneven, when wall thickness thinnest part size can not meet finished product thickness of pipe wall design specification, then whole pipe must be sentenced
It is useless, cause useless pipe.
Large-scale vertical extruder tube-making technologies more than 30000 ton forces is complicated, and home and abroad is not squeezed also on heavy caliber thick wall
The research report of pressure pipe wall unevenness.Vertical hot extrusion process large-sized heavy-wall tube wall unevenness problem must be accounted for, no
Then, huge economic loss is not only caused to enterprise, and it is high in the national strategy such as electric power, military project field to influence following country
The regular supply of large-sized heavy-wall tube is held, the strategic of country certainly will be influenceed, therefore, invents a kind of raising large-sized heavy-wall tube
The method of vertical hot extrusion process mesospore thickness uniformity is imminent.
The content of the invention
Present invention aims at providing a kind of method for improving the vertical hot extrusion process evenness of wall thickness of large-sized heavy-wall tube,
Large-sized heavy-wall tube wall unevenness problem is extruded for large-scale vertical extruder more than current 30,000 ton force, improves wall thickness 70mm
The evenness of wall thickness of~130mm extruded tubes, overcomes the shortcomings of present in prior art.
The present invention improves what the vertical hot extrusion process evenness of wall thickness method of large-sized heavy-wall tube was realized in：
(1) given shape is processed into pipe one end to be extruded, as shown in Fig. 2 shaped like bottom of bowl shape,
Wherein, d3=d4=d2/2；
D1=d2+ (2~20mm)；
D1=(1/5~1/50) × d0；
D0 is pipe thickness；D1, d2, d3 and d4 are pipe processing dimension parameter；
Pipe extruding front end given shape, which can reduce filling compression stage inhomogeneous deformation and reduce, breaks through compression stage most
Big extruding force.
(2) mold preheating temperature：Different according to blank tube material, mold preheating temperature selection is different.For heat-resisting steel material,
400 DEG C~450 DEG C of mold preheating temperature；For heat-resisting alloy material, 350~400 DEG C of mold preheating temperature.
(3) strictly control pipe extrudes lower limit temperature：Pipe extruding lower limit temperature refers to when pipe is placed into recipient
Hull-skin temperature.For heat-resisting steel material, 1000 DEG C~1010 DEG C of pipe extruding lower limit temperature scope；For heat-resisting alloy material
Material, 1030 DEG C~1040 DEG C of pipe extruding lower limit temperature scope.
(4) glass lubricant type and granularity selection：Outer painting glass used in lubrication between outer surface of tube blank and recipient
Glass powder, the mesh of granularity 130~150, glass film thickness 0.4mm~0.5mm；Lubrication institute between internal surface of bloom and plug outer surface
Interior glassing, the mesh of granularity 80~100, glass film thickness 0.3mm~0.4mm；Glass is used between pipe and outlet die
Glass pad, makes the mesh of particle size of glass powder 100~120 of glass isolator, and glass mat thickness is uniform.
It should be noted that all in above-mentioned process implementing have clamping pipe etc. to contact link with pipe, all need to mechanical arm
Heat-preservation cotton parcel is carried out, then carries out clamping mobile pipe, the heat that position is clamped to prevent outer surface of tube blank is dissipated by heat transfer
Lose, cause hull-skin temperature decline and inequality.
Heavy caliber thick wall tube material of the present invention has heat-resisting steel material and heat-resisting alloy material, wherein heat-resisting steel material
Including Ascalloy；Heat-resisting alloy material includes Refractoloy.Described heavy caliber thick wall thickness of pipe wall is 70mm
~130mm.
The composition main points of present invention are based on following understanding：
According to Fig. 1, to the eye, due to the off-center axis of servo-actuated plug, so as to cause the wall thickness of extruding pipe not
, but substantially, the essential reason for wall unevenness phenomenon occur is the imperfect flow of extruded heavy wall pipe metal.
Vertical hot extrusion process mainly includes three phases：Compression stage is filled, breaks through compression stage and stable extrusion
Stage.More than 30,000 ton forces vertical pipes used in vertical extruder are hollow cylinder in the prior art, and both ends are all to be straight
End face, such as Fig. 3, its end face right angle is cooling rate maximum region after coming out of the stove.Compression stage is being filled, when straight end face and is being extruded recessed
After mould initial contact, pipe flat end kept man of a noblewoman first produces local deformation, and this local deformation is inhomogeneous deformation；With extruding after
It is continuous to carry out, deformed area extension.On the one hand due to deflection increase, on the other hand because end temperature reduces comparatively fast, therefore not
Homogeneous deformation aggravates, and then fills lateral gap and medial gap respectively, so that it may be filled up completely with whole Extruding die.Then extruding
Continue, steel pipe is extruded mould, that is, reaches breakthrough compression stage, and extruding force now is maximum.Due to filling compression stage
Inhomogeneous deformation and break through compression stage extruding force it is very big, be servo-actuated plug it is easily eccentric so that when steel pipe is squeezed out mould
With regard to producing serious wall unevenness.When pipe extrusion cavity plate, that is, reach the stable extrusion stage, now extruding force declines, and substantially
Remain stable, if now controlling, temperature field is uneven and friction effect is bad, and wall unevenness phenomenon can aggravate.It can be seen that existing sky
The both ends of heart cylinder all be straight end face, and inhomogeneous deformation occurs during filling compression stage, causes extruding metal to start initial stage
Generation imperfect flow；It is too high to break through compression stage extruding force, plug is eccentric when easily causing to fill, in the production of extruding starting stage
Raw wall unevenness is even.If stable extrusion stage temperature and friction control are improper, wall unevenness can be aggravated.
If hollow cylinder pipe uses given shape, as shown in Fig. 2 temperature drop on the one hand can be minimized, it is another
Aspect reduces the inhomogeneous deformation for filling compression stage pipe, and temperature field and the improvement reduction to rub break through compression stage maximum and squeezed
Pressure, servo-actuated plug is maintained on mold center's axis, it is even to substantially improve initial compression stage wall unevenness；Meanwhile temperature
And friction effect improvement, stable extrusion stage not only uniform wall thickness, and extruding pipe surface quality is good.
In extrusion process, the main factor for influenceing the flowing of metal inhomogeneities is temperature and friction condition, and temperature influences
Friction, lubrication influence temperature again, therefore, control extrusion process temperature and friction condition, can be effectively improved metal uniformity flowing.
Influenceing blank tube material uniform temperature fields has two aspects：First, pipe surface temperature；Second, mold preheating temperature.Pipe
After base is come out of the stove, because heat radiation acts on, pipe inner and outer surfaces temperature constantly reduces, and particularly outer surface of tube blank, temperature drop are most fast.
If winter is extruded, environment temperature is relatively low, and pipe surface temperature drop is faster.Before extruding, pipe need to be sprayed or roller coating
Glass dust and " de-scaling " (i.e. except surface scale) process, pipe surface temperature further decline；During extruding, outer surface of tube blank with
Recipient inwall constantly conducts heat so that outer surface of tube blank temperature constantly declines；In addition blank centre when heavy wall pipe extrudes
There is temperature rise (10 DEG C~50 DEG C) so that the temperature difference at outer surface of tube blank and blank center difference is bigger, causes metal inhomogeneities
Flowing aggravation.In addition, the temperature of outer surface of tube blank reduces, lubricant effect is greatly reduced, and aggravates the inhomogeneities of pipe metal
Flowing.
Glass lubricant has good protection, lubrication, insulation and the performance such as heat-insulated.Lubricating condition quality is seamless to heavy wall
The hot extrusion of steel pipe is most important, directly affects extruding force size, extruded tube surface quality and die life etc..Influence profit
The factor of sliding effect includes the selection of temperature, glass lubricant type and granularity.Therefore, on the basis of temperature control is uniform,
Will be according to crumpling behavior, diverse location needs to select specific glass lubricant type and granularity so that glass film thickness is 0.3
Between~0.5 μm.Frictional position includes outer surface of tube blank and extrudes the contact surface between tube inner surface；Internal surface of bloom and plug
Outer surface；On pipe between cross section and outlet die (Extruding die), therefore, to be especially lubricated and set for these positions
Meter.
The main effect of outer dusting is to isolate between outer surface of tube blank and recipient, the requirement to lubrication be not it is very high,
Possess good wink fusibleness and thinner granularity.Dusting main function is in extruding between internal surface of bloom and plug outer surface
Isolation extruding plug and ingot blank inner surface, while play lubrication when ingot blank is pushed ahead.Viscosity can not be it is very high, its
Wink, fusibleness should ensure that, material property should not be too short.Glass isolator is lubrication extrusion die orifice between pipe and outlet die, isolates mould and base
Material, completely cut off heat transfer, prevent the excessive temperature rise of mould from causing the life-span to reduce.It is good that the performance of glass isolator will possess wink fusibleness, viscosity
Want slightly larger and material property is short.
The present invention has the advantage that and beneficial effect：By changing, pipe extrudes front end given shape, optimization mould preheats
Temperature, control temperature homogeneity and lubricant effect is improved, not only improve filling compression stage inhomogeneous deformation, improve extruding initial stage
Metal uniformity flows, and reduces and breaks through compression stage maximum extrusion pressure, and substantially improves the metal of stable extrusion process pipe
Uniformity flows, and significantly improves large-sized heavy-wall tube extrusion process evenness of wall thickness, meanwhile, the cost that saves material 20%,
Extend die life 20%, improve extrusion process labor productivity 15%, reduce the workload of follow-up machining about 70%.
Brief description of the drawings
Fig. 1 is that the 30000 ton force above vertical extruders wall unevenness phenomenon schematic diagram occur when extruding large-sized heavy-wall tube.Its
In, extrusion axis 1, extruding plug 2, dummy block 3, recipient 4, the quiet mould 5 of extruding, extruding hollow forging 6；Arrow represents the direction of motion；d11
It is to extrude waste thickness of pipe wall with d12, and d11 ≠ d12.
Fig. 2 is that pipe used in the present invention extrudes front end given configuration schematic diagram.Wherein, d0 is pipe thickness；d1、
D2, d3 and d4 are pipe processing dimension parameter.
Fig. 3 is that the pipe that prior art is commonly used extrudes the straight end view in front end.
Fig. 4 is Refractoloy pipe shape of the present invention and extruding front end geometry size.
Fig. 5 is heat resisting steel pipe shape of the present invention and extruding front end geometry size.
Fig. 6 is uniform wall thickness pictorial diagram when 30,000 ton force above vertical extruders of the invention extrude large-sized heavy-wall tube.
Fig. 7 is wall unevenness pictorial diagram when the ton force above vertical extruder of prior art 30,000 extrudes large-sized heavy-wall tube.
Embodiment
The present invention is specifically described below by way of specific embodiment, but the present invention is not limited by following embodiments.Ability
Domain those of ordinary skill does not have to obtain under the premise of creative work that to improve the vertical hot extrusion process wall thickness of large-sized heavy-wall tube equal
The technical scheme of even property method, belongs to the scope of the present invention.
Embodiment 1
Refractoloy main component percentage by weight of the embodiment of the present invention is：C：0.03%；Cr：24.1%；Co：
19.8%；Si：0.05%；Mn：0.07%；Al：1.45%；Ti：1.38%；Nb：1.2%；B：0.002%；Zr：0.08%；
P：0.001%；S：0.0005%；Ni is surplus and inevitable impurity element.Product specification is external diameter Φ 460mm × wall thickness
80mm heavy caliber thick wall heat-resisting alloy pipe.
The present invention is smelted the Refractoloy of 7 tons of one stove of+VAR consumables by mentioned component through VIM, makes external diameter Φ
945mm × wall thickness 320mm × 1000mm pipe.
Special process of the present invention is as follows：Pipe is hollow cylinder, and the spy matched with Extruding die is processed into extruding front end
Shape shape, sees Fig. 4.390 DEG C of mold preheating temperature.600 DEG C of shove charges of furnace temperature, 1000 DEG C, then profit are heated to 100 DEG C/h after protecting thoroughly
1180 DEG C of extrusion temperature, 30 DEG C of pipe radial temperature difference are heated to induction furnace.Hull-skin temperature is when pipe is hung in recipient
1034℃.The outer glassing granularity of pipe：150 mesh, coating thickness 0.45mm；The interior painting mesh of Powder Particle Size 90, coating thickness 0.35mm；
The mesh of granularity 110 of glass isolator between pipe and mould, thickness 75mm, thickness are uniform.Extrusion speed 50mm/s.
Evenness of wall thickness through heavy caliber thick wall of the present invention extruding heat-resisting alloy pipe is fine.
Embodiment 2
9Cr-3W-3Co of the embodiment of the present invention systems martensite heat-resistant steel (ferrite) main component percentage by weight is：C：
0.080%；Cr：8.99%；Si：0.30%；Mn：0.50%；Co：3.01%；W：2.81%；V：0.21%；Nb：0.53%；
N：0.008%；B：0.014%；Cu：0.8%；P：0.001%；S：0.0005%；Fe is surplus and inevitable impurity member
Element.Product specification is external diameter Φ 590mm × wall thickness 90mm heavy caliber thick wall heat resisting pipe.
The present invention press 40 tons of mentioned component EAF+LF+VD techniques smelting molten steel, pours into a mould 3 steel ingots, and selection two pieces is carried out pair
Than the pipe of hot extrusion, respectively making external diameter Φ 1080mm × wall thickness 330mm × long 1400mm.One is implemented by prior art；
Another is implemented by present invention process, i.e., given shape, lower control limit extrusion temperature, control mould are processed into pipe extruding front end
Preheating temperature and strict selection glass lubricant type and granularity.
Prior art hot extrusion technique is as follows：Pipe is hollow cylinder, and both ends of the surface are straight.300 DEG C of mold preheating temperature.
600 DEG C of shove charges of furnace temperature, 1000 DEG C are heated to 100 DEG C/h after protecting thoroughly, recycle induction furnace to be heated to 1170 DEG C of extrusion temperature, managed
20 DEG C of base radial temperature difference.Hull-skin temperature is 960 DEG C when pipe is hung in recipient.The outer glassing granularity of pipe：110 mesh；
The interior painting mesh of Powder Particle Size 110；The mesh of glass isolator granularity 100 between pipe and mould, thickness 90mm, thickness are uniform.Extrusion ratio 5.5,
Extrusion speed 50mm/s.Tube bending after extruding, it is not easy to hang out the demoulding.
Special process of the present invention is as follows：Pipe is hollow cylinder, and the spy matched with Extruding die is processed into extruding front end
Shape shape, sees Fig. 5.450 DEG C of mold preheating temperature.600 DEG C of shove charges of furnace temperature, 1000 DEG C, then profit are heated to 100 DEG C/h after protecting thoroughly
1170 DEG C of extrusion temperature, 20 DEG C of pipe radial temperature difference are heated to induction furnace.Hull-skin temperature is when pipe is hung in recipient
1008℃.The outer glassing granularity of pipe：150 mesh, coating thickness 0.45mm；The interior painting mesh of Powder Particle Size 90, coating thickness 0.35mm；
Glass isolator between pipe and mould makes for high temperature modification glass dust, the mesh of granularity 110, thickness 90mm, and thickness is uniform.Extrusion ratio
5.5, extrusion speed 50mm/s.Steel pipe glacing flatness is preferable after extruding, smoothly hangs out and is stripped.
Steel pipe after extruding routine techniques measures, and wall thickness thinnest part is 86mm, will less than production tube design specification
Ask, the steel pipe after routine techniques extruding is judged to useless pipe.Cross-sectional cut is carried out to two steel pipes, the heavy caliber after the present invention is thick
The cross section in kind (such as Fig. 6) of wall extruded tube, compared with existing conventional techniques (such as Fig. 7), heavy caliber thick wall extruded tube of the present invention
The even property of wall unevenness be improved significantly, meanwhile, the cost that saves material 20%, extend die life 20%, improve
Extrusion process labor productivity 15%, reduce the workload of follow-up machining about 70%.
Claims (3)
1. one kind improves the vertical extrusion process evenness of wall thickness method of large-sized heavy-wall tube, it is characterised in that processing step and control
The technical parameter of system is as follows：
(1) given shape is processed into pipe one end to be extruded, shaped like bottom of bowl shape,
Wherein, d0 is pipe thickness；D1, d2, d3 and d4 are pipe machining dimension parameter；
That is d1=(1/5~1/50) × d0；
D2=d1- (2~20mm)；
D3=d4=0.5 × d2；
(2) mold preheating temperature：For heat-resisting steel material, 400 DEG C~450 DEG C of mold preheating temperature；For heat-resisting alloy material,
350~400 DEG C of mold preheating temperature；
(3) pipe extruding lower limit temperature is controlled：Pipe extruding lower limit temperature refers to outer surface temperature when pipe is placed into recipient
Degree；For heat-resisting steel material, 1000 DEG C~1010 DEG C of pipe extruding lower limit temperature scope；For heat-resisting alloy material, pipe squeezes
Pressure 1030 DEG C~1040 DEG C of temperature range of limit；
(4) glass lubricant type and granularity selection：Outer glassing used in lubrication between outer surface of tube blank and recipient
The mesh of granularity 130~150, glass film thickness 0.4mm~0.5mm；Used in lubrication between internal surface of bloom and plug outer surface
Interior glassing, the mesh of granularity 80~100, glass film thickness 0.3mm~0.4mm；Glass isolator is used between pipe and outlet die,
The mesh of particle size of glass powder 100~120 of glass isolator is made, glass mat thickness is uniform.
2. according to the method for claim 1, it is characterised in that it is heat-resisting that the heavy caliber thick wall tube material includes ferrite
Steel and Refractoloy.
3. according to the method for claim 1, it is characterised in that described heavy caliber thick wall thickness of pipe wall is 70mm~130mm.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201610589965.8A CN106216415B (en) | 2016-07-24 | 2016-07-24 | Improve the vertical hot extrusion process evenness of wall thickness method of large-sized heavy-wall tube |
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| CN201610589965.8A CN106216415B (en) | 2016-07-24 | 2016-07-24 | Improve the vertical hot extrusion process evenness of wall thickness method of large-sized heavy-wall tube |
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| CN111014329B (en) * | 2019-12-13 | 2021-09-28 | 广东华昌集团有限公司 | Gapless extrusion method for aluminum alloy seamless pipe |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5904062A (en) * | 1998-05-11 | 1999-05-18 | The United States Of America As Represented By The Secretary Of The Air Force | Equal channel angular extrusion of difficult-to-work alloys |
| CN101706019B (en) * | 2009-12-10 | 2011-04-27 | 内蒙古北方重工业集团有限公司 | Method for manufacturing large-caliber thick-wall seamless steel tube in vertical extrusion way |
| CN102327919A (en) * | 2011-09-29 | 2012-01-25 | 西北工业大学 | Extrusion forming method for hole forming pin for Incone1690 alloy for seamless pipe |
| CN104259233B (en) * | 2014-07-26 | 2016-03-02 | 钢铁研究总院 | A kind of heavy caliber thick wall heat-resisting alloy pipe remaining pressing method with no pressure |
| CN105499293A (en) * | 2015-11-30 | 2016-04-20 | 内蒙古北方重工业集团有限公司 | Method for preparing large-diameter thick-walled seamless copper pipe through extruding machine |
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