CN103286151A - Preparation device and method for manufacturing inside and/or outside thickened aluminum alloy pipes with variable cross sections - Google Patents
Preparation device and method for manufacturing inside and/or outside thickened aluminum alloy pipes with variable cross sections Download PDFInfo
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- CN103286151A CN103286151A CN2012100467984A CN201210046798A CN103286151A CN 103286151 A CN103286151 A CN 103286151A CN 2012100467984 A CN2012100467984 A CN 2012100467984A CN 201210046798 A CN201210046798 A CN 201210046798A CN 103286151 A CN103286151 A CN 103286151A
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Abstract
The invention discloses a preparation device and method for manufacturing inside and/or outside thickened aluminum alloy pipes with variable cross sections. The preparation device adopts an extrusion pin and an extrusion die body as extrusion moulds; the extrusion die body is an integral extrusion die with a die hole, and two reducer sizing zones are arranged in the die hole at an interval along an axial direction and are in bevel connection; a second working zone, a reducing zone and a first working zone are arranged from the front end of the extrusion die to the back at intervals along an axial direction, the outer diameter of the first working zone is larger than that of the second working zone, the outer diameter of the second working zone is larger than that of the reducing zone, and the two working zones are in bevel connection with the reducing zone; when the aluminum alloy pipes are manufactured, the extrusion amount of an aluminum alloy ingot and the position of the extrusion pin inside the extrusion die are respectively controlled through a control system so as to obtain the inside and/or outside thickened aluminum alloy pipes. With the utilization of the preparation device and the method, the inside and/or outside thickened aluminum alloy pipes with variable cross sections can be manufactured, and the defects of the traditional manufacturing methods are overcome, so that the manufacturing quality and efficiency of the aluminum alloy pipes with variable cross sections are improved.
Description
Technical field
The present invention relates to a kind of preparation facilities and method of making band internal-external thickening form variable cross-section aluminium-alloy pipe.
Background technology
Aluminium is the second largest metal material that is only second to steel, and nearly development decades is very rapid, has obtained very to use widely in national economy and each field of people's lives.Along with development and national economy and continuous progress in science and technology, the tubing section has been proposed diversified requirement, general pipe no longer is most preferred version, therefore, development and the exploitation of variable cross-section aluminium alloy pipe have occurred.Abroad, kind quantity, production scale and the quality level of variable cross-section aluminium drill pipe tubing all are greatly improved.Variable cross-section aluminium drill pipe tubing main feature is to satisfy the strength and stiffness requirement of various parts to greatest extent, can design various parts by equal strength, not only safe and reliable, and can alleviate the weight of part greatly, the saving technique loss, reduce machining period and the amount of lightening one's labor, reduce the cost, improve social benefit and economic benefit.Though industrially developed country has developed production method and the technology of producing various variable cross-section aluminium drill pipes, but still production that can not stable mass, and a lot of kinds are still among development, and China needs XXL exploitation dynamics in that to make the variable cross-section aluminium alloy pipe still blank at present.
The application of variable cross-section aluminium alloy pipe will be more and more wider.Variable cross-section aluminium alloy pipe present application examples is as the aluminium drill pipe that is applied to various complicated drilling wells such as ultradeep well drilling well, directed drilling or continental shelf marine drilling.Aluminium alloy drill pipe body be exactly the body two-end part be a kind of varying cross-section duct of external upset (EU), interior thickening or internal-external thickening form.
At present, pushing the most frequently used extruding tool and mould of variable cross-section tubing both at home and abroad is to adopt many cover segmental mandrels to push basic tubing step by step partly and become section part.This just need shut down in extrusion process, so that more mold exchange and guiding mechanism, often gap not good because of the combination of mould lobe, the combination of mould lobe is big, and the metal solid size of tubing part is exceeded standard.Owing to be to adopt the segmentation extruding, the mould tube surfaces of damaging easily takes place in manual die change at nearly transition region place, influence surface quality; Product for dimensional accuracy and surface quality are had relatively high expectations often needs to carry out follow-up machining, and the characteristics of extruding can not be given full play to.Particularly these extruding tool and moulds can only push the ascending variable cross-section tubing that once changes in cross section, can't push descending, ascending continuous variable cross section tubing or the special-shaped part that repeats to change again in cross section, thereby can not give full play to the superiority of irregular section, limited kind and the range of application of variable cross-section extrusion.
Patent documentation CN201482818U, CN201482817U and CN102019303A are respectively at the extrusion die of thickening and thicken the protector aluminium drill pipe in making, the extrusion die of making the external upset (EU) aluminium drill pipe and preparation facilities and the method for aluminium alloy drill pipe body; these schemes have specific aim separately; distinguish to some extent with this preparation facilities and method, have different advantages separately and use object.
Summary of the invention
Technical problem to be solved by this invention provides a kind of preparation facilities and method of making band internal-external thickening form variable cross-section aluminium-alloy pipe, utilize these apparatus and method can make the variable cross-section aluminium alloy pipe of band internal-external thickening form, the defective that it has overcome the traditional fabrication method has improved making quality and the efficient of variable cross-section aluminium alloy pipe.
For solving the problems of the technologies described above, the present invention makes the preparation facilities of band internal-external thickening form variable cross-section aluminium-alloy pipe, comprise extruder and extruding tool and mould, described extruder is double-acting extruding machine, described extruding tool and mould comprises recipient, extrusion axis, extruding pin and extrusion die, described extrusion axis is positioned at described recipient, described extruding pin is positioned at the central through hole of described extrusion axis, described extrusion die is located at described recipient head end, described extruder is independently controlled described extruding pin, it is characterized in that: described extrusion die is the monolithic extruded mould of a nib, described extrusion die nib is interval with reducing first calibrating strap and second calibrating strap vertically respectively, the described second calibrating strap internal diameter is greater than the described first calibrating strap internal diameter, the described first calibrating strap internal diameter is determined by variable cross-section aluminium-alloy pipe nominal outside diameter, the described second calibrating strap internal diameter is determined by the external diameter of variable cross-section aluminium-alloy pipe internal-external thickening end, the inclined-plane connects between described first calibrating strap and second calibrating strap, described extruding pin front end is interval with reducing second work zone backward vertically successively, footpath contracting band and first work zone, described first work zone control variable cross-section aluminium-alloy pipe nominal inside diameter, the first work zone external diameter is determined by variable cross-section aluminium-alloy pipe nominal inside diameter, the internal diameter at described second work zone control variable cross-section aluminium-alloy pipe internal-external thickening position, the described second work zone external diameter is determined by variable cross-section aluminium-alloy pipe thickening position internal diameter, the first work zone external diameter is greater than the second work zone external diameter, the second work zone external diameter is greater than footpath contracting band external diameter, described first work zone, the inclined-plane rounding off connects between footpath contracting band and second work zone.
For guaranteeing that the pressing material circulation has sufficient free air space in the process of extruding variable cross-section aluminium-alloy pipe thickening position, directly the contract difference of band cross sectional area of the described extrusion die first calibrating strap cross section and extruding pin is not less than the poor of the extrusion die second calibrating strap cross section and the extruding pin second work zone cross sectional area.
The method that adopts above-mentioned preparation facilities to make band internal-external thickening form variable cross-section aluminium-alloy pipe comprises the steps:
Step 1: at first that preheating is good aluminium alloy cast ingot is packed in the recipient, mobile extrusion axis is gone into recipient, to push pin passes the extrusion axis central through hole and is squeezed in the aluminium alloy cast ingot, and make second work zone of extruding pin move into the extrusion die nib by the reach of extruding pin control system control extruding pin to be positioned at extrusion die second calibrating strap, utilize the extrusion axis control system to begin extruding, at this position aluminium alloy cast ingot upset end internal diameter by extruding pin second work zone control band internal-external thickening form variable cross-section aluminium-alloy pipe under the extruding force effect, the upset end external diameter of extrusion die second calibrating strap control band internal-external thickening form variable cross-section aluminium-alloy pipe finally is squeezed into band internal-external thickening form variable cross-section aluminium-alloy pipe upset end; The annular space that the footpath contracting band of extruding pin and first calibrating strap of extrusion die are formed provides sufficient aluminium alloy extruded material for the extruding aluminium alloy upset end in compression step;
Step 2: after the length of band internal-external thickening form variable cross-section aluminium-alloy pipe upset end reaches designing requirement length, extrusion axis control system control extruding aluminium alloy ingot casting, extruding pin control system will be pushed the pin reach, at this moment, extrusion die first calibrating strap and extruding pin first work zone and footpath contracting reduce gradually and accurately control the displacement of extrusion axis and the amount of compression of control aluminium alloy cast ingot with the gap on transition inclined-plane between the two, and final extruding forms band internal-external thickening form variable cross-section aluminium-alloy pipe thickening changeover portion;
Step 3: the extrusion axis control system continues the extruding aluminium alloy ingot casting, extruding pin control system will be pushed the pin reach makes extruding pin first work zone be positioned at the extrusion die first calibrating strap position, by the internal diameter of extruding pin first work zone control band internal-external thickening form variable cross-section aluminium-alloy pipe nominal body, with the external diameter of extrusion die first calibrating strap control band internal-external thickening form variable cross-section aluminium-alloy pipe nominal body; At this moment push the minimum space that passes through when annular space between pin first work zone and extrusion die first calibrating strap is aluminium alloy extruded, extruding control is configured as band internal-external thickening form variable cross-section aluminium-alloy pipe nominal pipe body portion like this;
Step 4: extrusion axis control system control extruding aluminium alloy ingot casting, after the length of band internal-external thickening form variable cross-section aluminium-alloy pipe nominal body reaches designing requirement, it is mobile backward that extruding pin control system will be pushed pin, extrusion die first calibrating strap and extruding pin first work zone and footpath contracting increase gradually with the gap on transition inclined-plane between the two and accurately control the displacement of extrusion axis and the amount of compression of control aluminium alloy cast ingot, like this extruding control be configured as be with internal-external thickening form variable cross-section aluminium-alloy pipe by the nominal body gradually to the thickening changeover portion of upset end transition;
Step 5: the extrusion axis control system continues the extruding aluminium alloy ingot casting, extruding pin control system will be pushed pin and will be positioned at extrusion die second calibrating strap in mobile second work zone of extruding pin that makes backward, by another upset end internal diameter of extruding pin second work zone control band internal-external thickening form variable cross-section aluminium-alloy pipe, another upset end external diameter of extrusion die second calibrating strap control band internal-external thickening form variable cross-section aluminium-alloy pipe is squeezed into another upset end of band internal-external thickening form variable cross-section aluminium-alloy pipe so again.
Because the present invention makes preparation facilities and the method for band internal-external thickening form variable cross-section aluminium-alloy pipe and has adopted technique scheme, namely adopt extruding pin and extrusion die as extrusion die, extrusion die is the monolithic extruded mould of a nib, its nib is interval with two reducing calibrating straps vertically, and the inclined-plane connects between two calibrating straps; Extruding pin pin front end is interval with second work zone, footpath contracting band and first work zone backward vertically, and the first work zone external diameter is greater than the second work zone external diameter, and the second work zone external diameter is greater than footpath contracting band external diameter, connects by the inclined-plane between two work zones and the footpath contracting band; When aluminium-alloy pipe is made, control the amount of compression of aluminium alloy cast ingot respectively and push the position of pin in extrusion die by control system, obtain being with internal-external thickening form variable cross-section aluminium-alloy pipe.Utilize this preparation facilities and method can make the variable cross-section aluminium alloy pipe of band internal-external thickening form, the defective that it has overcome the traditional fabrication method has improved making quality and the efficient of variable cross-section aluminium alloy pipe.
Description of drawings
The present invention is described in further detail below in conjunction with drawings and embodiments:
Fig. 1 makes the structural representation of the variable cross-section aluminium-alloy pipe preparation facilities of band internal-external thickening form for the present invention;
Extruding schematic diagram when Fig. 2 is compressive zone internal-external thickening form variable cross-section aluminium-alloy pipe upset end;
Extruding schematic diagram when Fig. 3 is compressive zone internal-external thickening form variable cross-section aluminium-alloy pipe thickening changeover portion;
Extruding schematic diagram when Fig. 4 is compressive zone internal-external thickening form variable cross-section aluminium-alloy pipe nominal section;
Fig. 5 is that compressive zone internal-external thickening form variable cross-section aluminium-alloy pipe pushes schematic diagram to the thickening changeover portion of upset end transition gradually by the nominal body;
Fig. 6 is the extruding schematic diagram during for another upset end of compressive zone internal-external thickening form variable cross-section aluminium-alloy pipe again.
The specific embodiment
As shown in Figure 1, the present invention makes the preparation facilities of the variable cross-section aluminium-alloy pipe of band internal-external thickening form, comprise extruder and extruding tool and mould, described extruder is double-acting extruding machine, described extruding tool and mould comprises recipient 4, extrusion axis 3, extruding pin 1 and extrusion die 2, described extrusion axis 3 is positioned at described recipient 4, described extruding pin 1 is positioned at the central through hole of described extrusion axis 3, described extrusion die 2 is located at described recipient 4 head ends, described extruder is to described extruding pin 1 independent control, it is characterized in that: described extrusion die 2 is monolithic extruded moulds of a nib 23, the nib 23 of described extrusion die 2 is interval with reducing first calibrating strap 21 and second calibrating strap 22 vertically respectively, described second calibrating strap, 22 internal diameters are greater than described first calibrating strap, 21 internal diameters, described first calibrating strap, 21 internal diameters are determined by variable cross-section aluminium-alloy pipe nominal outside diameter, described second calibrating strap, 22 internal diameters are determined by the external diameter of variable cross-section aluminium-alloy pipe internal-external thickening end, the inclined-plane connects between described first calibrating strap 21 and second calibrating strap 22, described extruding pin 1 front end is interval with reducing second work zone 13 backward vertically successively, 12 and first work zone 11 is with in the footpath contracting, described first work zone 11 control variable cross-section aluminium-alloy pipe nominal inside diameters, first work zone, 11 external diameters are determined by variable cross-section aluminium-alloy pipe nominal inside diameter, the internal diameter at 13 control variable cross-section aluminium-alloy pipe internal-external thickening positions, described second work zone, described second work zone 13 external diameters are determined by the internal diameter at variable cross-section aluminium-alloy pipe internal-external thickening position, first work zone, 11 external diameters are greater than second work zone, 13 external diameters, second work zone, 13 external diameters are with 12 external diameters, described first work zone 11 greater than the footpath contracting, the inclined-plane connected between second work zone 13 and footpath contracting were with 12.
For guaranteeing that the pressing material circulation has sufficient free air space in the process of extruding variable cross-section aluminium-alloy pipe thickening position, described extrusion die 2 first calibrating straps 21 cross sections and the 1 footpath contracting of extruding pin are with the difference of 12 cross sectional areas to be not less than extrusion die 2 second calibrating straps 22 cross sections and are pushed the poor of pin 1 second work zone 13 cross sectional areas.
The method that adopts above-mentioned preparation facilities to make band internal-external thickening form variable cross-section aluminium-alloy pipe comprises the steps:
Step 1: as shown in Figure 2, at first that preheating is good aluminium alloy cast ingot 5 is packed in the recipient 4, mobile extrusion axis 3 is gone into recipient 4, to push pin 1 passes extrusion axis 3 central through holes and is squeezed in the aluminium alloy cast ingot 5, and make second work zone 13 of extruding pin 1 move into extrusion die nibs 23 by 1 reach of extruding pin 1 control system control extruding pin to be positioned at extrusion die 2 second calibrating straps 22, utilize extrusion axis 3 control systems to begin extruding, at this position aluminium alloy cast ingot 5 upset end 61 internal diameters by extruding pin 1 second work zone 13 control band internal-external thickening form variable cross-section aluminium-alloy pipes under the extruding force effect, upset end 61 external diameters of extrusion die 2 second calibrating straps 22 control band internal-external thickening form variable cross-section aluminium-alloy pipes finally are squeezed into band internal-external thickening form variable cross-section aluminium-alloy pipe upset end 61; The footpath contracting of extruding pin 1 with 12 and the annular space formed of first calibrating strap 21 of extrusion die 2 in compression step, provide sufficient aluminium alloy extruded material for the extruding aluminium alloy upset end;
Step 2: as shown in Figure 3, after the length of band internal-external thickening form variable cross-section aluminium-alloy pipe upset end 61 reaches designing requirement length, extrusion axis 3 control systems control extruding aluminium alloy ingot casting 5, extruding pin 1 control system will be pushed pin 1 reach, at this moment, extrusion die 2 first calibrating straps 21 and extruding pin 1 first work zone 11 and footpath contracting with 12 between the two the gap on transition inclined-plane reduce gradually and accurately control the displacement of extrusion axis 3 and the amount of compression of control aluminium alloy cast ingot 5, final extruding forms band internal-external thickening form variable cross-section aluminium-alloy pipe thickening changeover portion 62;
Step 3: as shown in Figure 4, extrusion axis 3 control systems continue extruding aluminium alloy ingot casting 5, extruding pin 1 control system will be pushed pin 1 reach makes extruding pin 1 first work zone 11 be positioned at extrusion die 2 first calibrating straps 21 positions, by the internal diameter of extruding pin 1 first work zone 11 control band internal-external thickening form variable cross-section aluminium-alloy pipe nominal bodys 63, with the external diameter of extrusion die 2 first calibrating straps 21 control band internal-external thickening form variable cross-section aluminium-alloy pipe nominal bodys 63; At this moment push the minimum space that passes through when annular space between pin 1 first work zone 11 and extrusion die 2 first calibrating straps 21 is aluminium alloy extruded, extruding control is configured as band internal-external thickening form variable cross-section aluminium-alloy pipe nominal body 63 parts like this;
Step 4: as shown in Figure 5, extrusion axis 3 control systems control extruding aluminium alloy ingot casting 5, after the length of band internal-external thickening form variable cross-section aluminium-alloy pipe nominal body 63 reaches designing requirement, it is mobile backward that extruding pin 1 control system will be pushed pin 1, extrusion die 2 first calibrating straps 21 and extruding pin 1 first work zone 11 and footpath contracting with 12 between the two the gap on transition inclined-plane increase gradually and accurately control the displacement of extrusion axis 3 and the amount of compression of control aluminium alloy cast ingot 5, like this extruding control be configured as be with internal-external thickening form variable cross-section aluminium-alloy pipe by nominal body 63 gradually to the thickening changeover portion 64 of upset end transition;
Step 5: as shown in Figure 6, extrusion axis 3 control systems continue extruding aluminium alloy ingot casting 5, extruding pin 1 control system will be pushed pin 1 and will be positioned at extrusion die 2 second calibrating straps 22 in mobile second work zone 13 of extruding pin 1 that makes backward, by extruding pin 1 second work zone 13 another upset end 65 internal diameters of control band internal-external thickening form variable cross-section aluminium-alloy pipe, extrusion die 2 second calibrating straps 22 another upset end 65 external diameters of control band internal-external thickening form variable cross-section aluminium-alloy pipe are squeezed into another upset end 65 of band internal-external thickening form variable cross-section aluminium-alloy pipe so again.
Claims (3)
1. make the preparation facilities of being with internal-external thickening form variable cross-section aluminium-alloy pipe for one kind, comprise extruder and extruding tool and mould, described extruder is double-acting extruding machine, described extruding tool and mould comprises recipient, extrusion axis, extruding pin and extrusion die, described extrusion axis is positioned at described recipient, described extruding pin is positioned at the central through hole of described extrusion axis, described extrusion die is located at described recipient head end, described extruder is independently controlled described extruding pin, it is characterized in that: described extrusion die is the monolithic extruded mould of a nib, described extrusion die nib is interval with reducing first calibrating strap and second calibrating strap vertically respectively, the described second calibrating strap internal diameter is greater than the described first calibrating strap internal diameter, the described first calibrating strap internal diameter is determined by the aluminium-alloy pipe nominal outside diameter, the described second calibrating strap internal diameter is determined by the external diameter of variable cross-section aluminium-alloy pipe internal-external thickening end, the inclined-plane connects between described first calibrating strap and second calibrating strap, described extruding pin is mobile in described extrusion die under the control of described extruder, described extruding pin front end is interval with reducing second work zone backward vertically successively, footpath contracting band and first work zone, described first work zone control variable cross-section aluminium-alloy pipe nominal inside diameter, the first work zone external diameter is determined by variable cross-section aluminium-alloy pipe nominal inside diameter, the internal diameter at described second work zone control variable cross-section aluminium-alloy pipe internal-external thickening position, the described second work zone external diameter is determined by variable cross-section aluminium-alloy pipe internal-external thickening position internal diameter, the first work zone external diameter is greater than the second work zone external diameter, the second work zone external diameter is greater than footpath contracting band external diameter, described first work zone, the inclined-plane rounding off connects between footpath contracting band and second work zone.
2. the preparation facilities of making band internal-external thickening form variable cross-section aluminium-alloy pipe according to claim 1 is characterized in that: directly the contract difference of band cross sectional area of the described extrusion die first calibrating strap cross section and extruding pin is not less than the poor of the extrusion die second calibrating strap cross section and the extruding pin second work zone cross sectional area.
3. make the method for band internal-external thickening form variable cross-section aluminium-alloy pipe according to claim 1 preparation facilities, it is characterized in that: this method comprises the steps:
Step 1: at first that preheating is good aluminium alloy cast ingot is packed in the recipient, mobile extrusion axis is gone into recipient, to push pin passes the extrusion axis central through hole and is squeezed in the aluminium alloy cast ingot, and make second work zone of extruding pin move into the extrusion die nib by the reach of extruding pin control system control extruding pin to be positioned at extrusion die second calibrating strap, utilize the extrusion axis control system to begin extruding, at this position aluminium alloy cast ingot upset end internal diameter by extruding pin second work zone control band internal-external thickening form variable cross-section aluminium-alloy pipe under the extruding force effect, the upset end external diameter of extrusion die second calibrating strap control band internal-external thickening form variable cross-section aluminium-alloy pipe finally is squeezed into band internal-external thickening form variable cross-section aluminium-alloy pipe upset end; The annular space that the footpath contracting band of extruding pin and first calibrating strap of extrusion die are formed provides sufficient aluminium alloy extruded material for the extruding aluminium alloy upset end in compression step;
Step 2: after the length of band internal-external thickening form variable cross-section aluminium-alloy pipe upset end reaches designing requirement length, extrusion axis control system control extruding aluminium alloy ingot casting, extruding pin control system will be pushed the pin reach, at this moment, extrusion die first calibrating strap and extruding pin first work zone and footpath contracting reduce gradually and accurately control the displacement of extrusion axis and the amount of compression of control aluminium alloy cast ingot with the gap on transition inclined-plane between the two, and final extruding forms band internal-external thickening form variable cross-section aluminium-alloy pipe thickening changeover portion;
Step 3: the extrusion axis control system continues the extruding aluminium alloy ingot casting, extruding pin control system will be pushed the pin reach makes extruding pin first work zone be positioned at the extrusion die first calibrating strap position, by the internal diameter of extruding pin first work zone control band internal-external thickening form variable cross-section aluminium-alloy pipe nominal body, with the external diameter of extrusion die first calibrating strap control band internal-external thickening form variable cross-section aluminium-alloy pipe nominal body; At this moment push the minimum space that passes through when annular space between pin first work zone and extrusion die first calibrating strap is aluminium alloy extruded, extruding control is configured as band internal-external thickening form variable cross-section aluminium-alloy pipe nominal pipe body portion like this;
Step 4: extrusion axis control system control extruding aluminium alloy ingot casting, after the length of band internal-external thickening form variable cross-section aluminium-alloy pipe nominal body reaches designing requirement, it is mobile backward that extruding pin control system will be pushed pin, extrusion die first calibrating strap and extruding pin first work zone and footpath contracting increase gradually with the gap on transition inclined-plane between the two and accurately control the displacement of extrusion axis and the amount of compression of control aluminium alloy cast ingot, like this extruding control be configured as be with internal-external thickening form variable cross-section aluminium-alloy pipe by the nominal body gradually to the thickening changeover portion of upset end transition;
Step 5: the extrusion axis control system continues the extruding aluminium alloy ingot casting, extruding pin control system will be pushed pin and will be positioned at extrusion die second calibrating strap in mobile second work zone of extruding pin that makes backward, by another upset end internal diameter of extruding pin second work zone control band internal-external thickening form variable cross-section aluminium-alloy pipe, another upset end external diameter of extrusion die second calibrating strap control band internal-external thickening form variable cross-section aluminium-alloy pipe is squeezed into another upset end of band internal-external thickening form variable cross-section aluminium-alloy pipe so again.
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| CN201210046798.4A CN103286151B (en) | 2012-02-28 | 2012-02-28 | Preparation device and method for manufacturing inside and/or outside thickened aluminum alloy pipes with variable cross sections |
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| CN201210046798.4A CN103286151B (en) | 2012-02-28 | 2012-02-28 | Preparation device and method for manufacturing inside and/or outside thickened aluminum alloy pipes with variable cross sections |
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| CN103736768A (en) * | 2013-12-31 | 2014-04-23 | 西南石油大学 | Squeezing device and method for tubular material with unchanged inner diameter and increased thicknesses of both end walls as well as squeezing method thereof |
| CN104275358A (en) * | 2014-09-22 | 2015-01-14 | 吉林利源精制股份有限公司 | Extrusion molding method for aluminum alloy inner diameter-changeable seamless tube |
| CN104624686A (en) * | 2015-03-03 | 2015-05-20 | 太原重工股份有限公司 | Method and device for extruding aluminium alloy pipe with variable cross section |
| CN108160404A (en) * | 2018-02-05 | 2018-06-15 | 镇江艾润润滑油有限公司 | A kind of portable lubricant pressurizing unit |
| CN113083927A (en) * | 2021-03-29 | 2021-07-09 | 西南铝业（集团）有限责任公司 | Variable-section pipe extrusion forming device and extruder |
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| CN202239003U (en) * | 2011-08-24 | 2012-05-30 | 广东银一百创新铝业有限公司 | Extrusion die for greatly enhancing surface finish of aluminum-alloy square tube |
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| CN103286151B (en) | 2017-04-19 |
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