CN101767150B - Stretch drawing die for seamless steel cylinder - Google Patents

Stretch drawing die for seamless steel cylinder Download PDF

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Publication number
CN101767150B
CN101767150B CN200910264124A CN200910264124A CN101767150B CN 101767150 B CN101767150 B CN 101767150B CN 200910264124 A CN200910264124 A CN 200910264124A CN 200910264124 A CN200910264124 A CN 200910264124A CN 101767150 B CN101767150 B CN 101767150B
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China
Prior art keywords
die
roller
layer
seamless steel
steel cylinder
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CN200910264124A
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CN101767150A (en
Inventor
赵长财
曹秒艳
董国疆
赵伦元
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NANJING BANQIAO FIRE-FIGHTING EQUIPMENT Co Ltd
Yanshan University
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NANJING BANQIAO FIRE-FIGHTING EQUIPMENT Co Ltd
Yanshan University
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Abstract

The invention provides a stretch drawing die for seamless steel cylinder, which can reduce a stretching force and improve pass reduction and prolong service life of the die, and is particularly suitable for the stretch forming of the thin-wall seamless steel cylinder. The stretch drawing die comprises more than two layers of roller dies, each layer of roller die at least consists of two rollers, and bus bars in each layer of roller die form an almost closed die hole; the roller die holes of all layers are coaxial; from the front part to the tail part along the processing direction of the seamless steel cylinder, the apertures of roller die holes of all layers gradually decrease; and except the roller die holes of the last layer, the roller die holes of other layers are not circular.

Description

Stretch drawing die for seamless steel cylinder
Technical field
The present invention relates to a kind of stretch drawing die for seamless steel cylinder, be specially adapted to the stretch forming of thin-wall seamless steel cylinder, belong to the stress metal processing technique field.
Background technology
Along with the shortage and the petroleum product of petroleum resources in use pollutes atmosphere, and the huge gas reserves in the whole world, all readjusting the energy structure in countries in the world, and gasoline is used gas instead and is developed rapidly.Automobile sharply increases with the demand of steel bottle filled with compressed natural gas, but just progressively is tending towards big light capacity quality as the used steel bottle filled with compressed natural gas of the limited automobile of loading capacity.The compound steel cylinder that a kind of steel inner bag adds winding is liked by the user more and more.Can produce the seamless inner bag of large diameter thin wall (wall thickness compares less than 0.02 with diameter) always is a difficult problem.
Existing seamless steel cylinder drawing process: a round base (or square billet) that is heated to forging temperature is pre-formed into the band thick cyclinder at the end through the reverse extruding of punching hydraulic press.This thick cyclinder as blank drawn hydraulic press with the stretched required gas cylinder of stretch drawing die for seamless steel cylinder.It is high that the gas cylinder that this method is shaped has bottle intensity, the flawless characteristics in bottom.
Existing stretch drawing die for seamless steel cylinder; Referring to Fig. 1, Fig. 2; Comprise at least one circle mould 13 and two-layer at least above running roller mould; Every layer of running roller mould formed (being four running rollers 14 among Fig. 2) by two running rollers at least, and the running roller bus in every layer of running roller mould surrounds the circular running roller nib 15 of a base closed; It is all coaxial that each encloses the running roller nib 15 of mould 13 and each layer, and along the machine direction of seamless steel cylinder from the beginning to the end, and each aperture of running roller nib of enclosing minimum diameter, each layer of mould reduces gradually.
Referring to Fig. 1, along the circle mold shaft to, circle mould endoporus is made up of lubricated band I, compression band II, calibrating strap III and outlet band IV, the bus of lubricated band I, compression band II, calibrating strap III and outlet band IV is straight line, adjacent each use round-corner transition between being with; The minimum diameter of circle mould is on the calibrating strap.
When the steel cylinder blank during successively through each circle mould, each layer running roller mould, constantly reduces steel cylinder blank external diameter, thereby reach the attenuate workpiece, with the purpose of seamless steel cylinder drawing and forming under the drift effect.
Existing stretch drawing die for seamless steel cylinder; Because the calibrating strap III bus at circle mould minimum diameter place is a straightway, causes tensile force bigger, passage (promptly respectively enclosing mould, each layer running roller mould) working modulus is low; Enclose the mould quick abrasion, be prone to the phenomenon of material constriction and wall unevenness during stretching.Also because the running roller nib of each layer is circle, steel cylinder is through the running roller nib time, and metal flow can only carry out vertically flowing vertically; Can not produce lateral flow; Tensile force is bigger, is prone to the phenomenon of material constriction and wall unevenness, is not suitable for the production of thin-wall seamless gas cylinder.Therefore existing stretch drawing die for seamless steel cylinder is mainly used in heavy wall seamless steel cylinder (wall thickness compares greater than 0.02 with diameter) shaping, and is difficult to reach requirement for the processing of thin-wall seamless steel cylinder, and its production is restricted.
Summary of the invention
The purpose of this invention is to provide a kind of tensile force that reduces, improve pass reduction and production efficiency, prolong die life, be particularly suitable for the stretch drawing die for seamless steel cylinder of thin-wall seamless steel cylinder stretch forming.
This stretch drawing die for seamless steel cylinder comprises two-layer above running roller mould, and every layer of running roller mould is made up of two running rollers at least, and the running roller bus in every layer of running roller mould surrounds the running roller nib of a base closed; The running roller nib of each layer is coaxial, and along the machine direction of seamless steel cylinder from the beginning to the end, the aperture of the running roller nib of each layer reduces gradually, and except that the running roller nib of last one deck, the running roller nib of other each layer is not circular.
Because the running roller nib of other each layer is not circular, that is to say that each point is unequal to the distance of running roller nib axis on the running roller bus of other each layer running roller.When stretching, the running roller nib of non-circular hole type can allow metal carrying out vertically flowing vertically to produce lateral flow simultaneously, more helps metal flow; Make and do not reducing under the attenuate amount prerequisite; The drift tensile force reduces, and improves passage (each layer running roller mould) working modulus and production efficiency, prolongs die life; Workpiece is easy fracture not, thereby is more suitable for the production of thin-wall seamless gas cylinder.
Above-mentioned stretch drawing die for seamless steel cylinder, except that the running roller mould of last one deck, the bus of other each layer middle rolls is the curve of elliptic curve, parabolic curve, hyperbola curve or other form.Except that the running roller nib of last one deck, along the machine direction of seamless steel cylinder from the beginning to the end, it is circular that the running roller nib of other each layer is tending towards gradually; The running roller nib of last one deck is circular.The aperture that the running roller bus curvature of each layer is tending towards circle and running roller nib gradually progressively reduces, and last passage running roller mould adopts round pass to reach finishing press polish effect.Under the effect of hot steel cylinder blank at drift, each layer running roller mould makes steel cylinder blank wall thickness attenuate gradually successively, and the aperture of last one running roller nib equals steel cylinder and requires diameter.
Above-mentioned stretch drawing die for seamless steel cylinder, it also comprises at least one and running roller nib circle mould coaxial, that be arranged on the front end of ground floor running roller mould; Along the machine direction of seamless steel cylinder from the beginning to the end, each aperture of running roller nib of enclosing minimum diameter, each layer of mould reduces gradually.Under of the effect of hot steel cylinder blank, through each circle mould, through the running roller mould, make steel cylinder blank wall thickness attenuate gradually more earlier at drift.
Preferably, along the circle mold shaft to, circle mould endoporus has lubricated band, compression band, calibrating strap, outlet band, use round-corner transition between adjacent each band, the bus of calibrating strap is curve (like perhaps other curves of elliptic curve, parabolic curve, hyperbola curve); The minimum diameter of circle mould is on the calibrating strap.In the drawing process, through the circle mould time, metal gets into the calibrating strap that bus is a curve from the compression band through fillet again, and this interim form meets the principle of metal flow curve smoothing transition more; The interim form of this slyness reduces the friction between metal and calibrating strap surface, thereby reduces tensile force, improves pass reduction and production efficiency, prolongs die life.
Above-mentioned stretch drawing die for seamless steel cylinder, the running roller in each layer running roller mould is circumferentially evenly arranged along the running roller nib.
Description of drawings
Fig. 1 is existing circle mode structure sketch map.
Fig. 2 is the structural representation of existing circular hole running roller mould.
Fig. 3 is the structural representation (the circle mould vertical view among Fig. 5) of centre circle mould of the present invention.
Fig. 4 is the structural representation (vertical view of the running roller mould layer 9 (8,7) among Fig. 5) of non-circular hole forming roll wheel mould among the present invention.
Fig. 5 is a sketch map of the present invention.
When Fig. 6 is stretching φ 406mm * 6mm seamless gas cylinder, single track existing circle mould and single track circle mould of the present invention tensile force finite element modelling curve comparison diagram.
When Fig. 7 is stretching φ 406mm * 6mm seamless gas cylinder, use existing stretch drawing die for seamless steel cylinder and stretch drawing die for seamless steel cylinder of the present invention tensile force finite element modelling curve comparison diagram through complete operation.
The specific embodiment
For further understanding technology contents of the present invention, characteristics and effect, the following examples of giving an example now, and conjunction with figs. specifies as follows.
Referring to Fig. 5; Stretch drawing die for seamless steel cylinder of the present invention along the machine direction of seamless steel cylinder from the beginning to the end, has three circle moulds 3 and four layers of running roller mould layer 7-10 successively; Every layer of running roller mould is made up of four (also can adopt two, three, five running rollers, decide as required) running rollers 4 at least; Running roller with one deck arranges that symmetrically angle is 90 ° between adjacent axis.Referring to Fig. 4, the bus 6 of running roller mould layer 7,8,9 middle roll 4 is oval camber lines, and the running roller bus 6 in the running roller mould layer 7,8,9 all surrounds the non-circular running roller nib 5 of a base closed.The bus of the running roller 4 in the running roller mould layer 10 of last one deck is circular arcs, and the running roller bus in the running roller mould layer 10 surrounds the circular running roller nib of a base closed.
Steel cylinder blank 2 is arranged on the lower end of drift 1.Each encloses the running roller nib of mould, each layer, all coaxial with drift 1.
Referring to Fig. 3; Axial along circle mould 3, circle mould endoporus is made up of lubricated band I, compression band II, calibrating strap III and outlet band IV, and the bus of lubricated band I, compression band II and outlet band IV is straight line; The bus 31 of calibrating strap III is oval camber lines, uses round-corner transition between adjacent each band; The minimum diameter of circle mould is on the calibrating strap.
Along the machine direction of seamless steel cylinder from the beginning to the end, each aperture of running roller nib of enclosing minimum diameter, each layer of mould reduces gradually.
A round base (or square billet) that is heated to forging temperature is pre-formed into the band thick cyclinder at the end through the reverse extruding of punching hydraulic press, should hot thick cyclinder as stretching with steel cylinder blank 2.Steel cylinder blank 2 is hot steel or aluminium alloy.When steel cylinder blank 2 when drift 1 effect is enclosed mould, each layer running roller mould down through each successively, steel cylinder blank external diameter is constantly reduced, thereby reaches the attenuate workpiece, the purpose of seamless steel cylinder drawing and forming.
Each encloses mould and each layer running roller mould is arranged along machine direction by different level.The bus that the present invention will enclose mould 3 calibrating strap III changes the curve that chord length equates with this straight line into by existing straightway, and this curve is oval camber line (or other conic section).Metal gets into the calibrating strap of elliptic arc again in the drawing process through fillet from the compression band; The interim form of this slyness reduces the friction between metal and calibrating strap surface, thereby reduces tensile force, improves pass reduction and production efficiency, prolongs die life.
Also change the bus of single running roller in preceding 1 to the 3 road running roller mould (being running roller mould layer 7-9) into the elliptical curvature arc by existing circular arc among the present invention, 4 running roller moulds are formed plum blossom shape non-circular hole types (referring to Fig. 4).The elliptical curvature of 1 to 3 road running roller mould is tending towards circular gradually according to passage, and last the 4th road running roller mould (being running roller mould layer 10) adopts circular bus to reach setting finishing press polish effect.
Referring to Fig. 5, the circle die drawing is stretched number of times (circle mould number) and can be arranged according to processing needs, reaches thickest attenuate amount and does not break workpiece and be as the criterion to save the space, is generally 2 to 5 roads, employing 3 roads in this example.Each circle nib footpath, road (minimum diameter) reduces along the drift direction of motion gradually.Running roller mould road number of times (the running roller mould number of plies) is generally 2 to 5 roads, adopts 4 roads in this example.When hot steel cylinder blank 2 under the effect of drift 1, through each circle mould 3 and each layer running roller mould, make steel cylinder blank wall thickness attenuate gradually successively, last one running roller nib directly equals steel cylinder requirement diameter.
The present invention has the following advantages and good effect:
1, in the drawing process, through the circle mould time, the interim form that metal is with the process fillet to get into elliptic arc again from compression meets the principle of metal flow curve smoothing transition more; The interim form of this slyness reduces the friction between metal and calibrating strap surface, thereby reduces tensile force (referring to Fig. 6), improves pass reduction and production efficiency, prolongs die life.
2, the non-circular hole type that has of roller mould 4 can allow metal carrying out vertically flowing to produce lateral flow simultaneously.Such process layout helps metal flow, makes do not reducing under the attenuate amount prerequisite, and the drift tensile force reduces (referring to Fig. 7), thereby is more suitable for the production of thin-wall seamless gas cylinder.
3, circle mould calibrating strap busbar becomes the curve present situation, reaches the running roller busbar and becomes non-circular curve, can effectively reduce the drift tensile force; The steel cylinder blank is not broken; Prolong die life, improve machining accuracy, and the job stability of whole drawing process is strengthened.

Claims (6)

1.无缝钢瓶拉伸模具，包括两层以上的辊轮模，每层辊轮模至少由两个辊轮组成，每层辊轮模中的辊轮母线围成一个基本封闭的辊轮模孔；各层的辊轮模孔同轴，且沿着无缝钢瓶的加工方向从头到尾，各层的辊轮模孔的孔径逐渐减小，其特征是：除最后一层的辊轮模孔外，其它各层的辊轮模孔不是圆形；除最后一层的辊轮模外，其他各层中辊轮的母线为椭圆曲线、抛物线曲线或者双曲线曲线。1. Stretching die for seamless steel cylinders, including more than two layers of roller molds, each layer of roller molds is composed of at least two rollers, and the generatrices of the rollers in each layer of roller molds form a basically closed roller mold holes; the holes of the roller dies of each layer are coaxial, and along the processing direction of the seamless steel cylinder from the beginning to the end, the apertures of the roller die holes of each layer gradually decrease. The characteristics are: except for the roller dies of the last layer Except the holes, the holes of the roller molds of other layers are not circular; except the roller molds of the last layer, the generatrices of the rollers in other layers are elliptic curves, parabolic curves or hyperbolic curves. 2.如权利要求1所述的无缝钢瓶拉伸模具，其特征是：除最后一层的辊轮模孔外，沿着无缝钢瓶的加工方向从头到尾，其它各层的辊轮模孔逐渐趋于圆形；最后一层的辊轮模孔是圆形。2. The seamless steel cylinder stretching die as claimed in claim 1, characterized in that: except for the last layer of roller die holes, along the processing direction of the seamless steel cylinder from beginning to end, the roller dies of other layers The hole gradually tends to be circular; the roller die hole of the last layer is circular. 3.如权利要求1所述的无缝钢瓶拉伸模具，其特征是：它还包括至少一个与辊轮模孔同轴的、设置在第一层辊轮模的前端的圈模；沿着无缝钢瓶的加工方向从头到尾，各圈模的最小内径、各层的辊轮模孔的孔径逐渐减小。3. The seamless steel cylinder drawing die as claimed in claim 1, characterized in that: it also includes at least one ring die coaxial with the roller die hole, arranged at the front end of the first layer of roller die; along From the beginning to the end of the processing direction of the seamless steel cylinder, the minimum inner diameter of each ring die and the hole diameter of the roller die holes of each layer gradually decrease. 4.如权利要求3所述的无缝钢瓶拉伸模具，其特征是：沿圈模轴向，圈模内孔具有润滑带、压缩带、定径带、出口带，相邻各带之间用圆角过渡；定径带的母线是曲线；圈模的最小内径处在定径带上。4. The drawing die for seamless steel cylinders as claimed in claim 3, characterized in that: along the axial direction of the ring die, the inner hole of the ring die has lubricating bands, compression bands, sizing bands, and outlet bands, and between adjacent bands Use fillet transition; the generatrix of the sizing belt is a curve; the minimum inner diameter of the ring die is on the sizing belt. 5.如权利要求4所述的无缝钢瓶拉伸模具，其特征是：圈模定径带的母线是椭圆曲线、抛物线曲线或者双曲线曲线。5. The drawing die for seamless steel cylinders as claimed in claim 4, characterized in that: the generatrix of the sizing band of the ring die is an elliptic curve, a parabolic curve or a hyperbolic curve. 6.如权利要求1所述的无缝钢瓶拉伸模具，其特征是：各层辊轮模中的辊轮沿着辊轮模孔周向均匀布置。6. The drawing die for seamless steel cylinders according to claim 1, characterized in that: the rollers in each layer of roller dies are evenly arranged along the circumference of the roller die holes.
CN200910264124A 2009-12-30 2009-12-30 Stretch drawing die for seamless steel cylinder Expired - Fee Related CN101767150B (en)

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106975709A (en) * 2017-05-15 2017-07-25 南京板桥消防设备有限责任公司 The vertical hot-pull technique of seamless gas cylinder
CN113617943B (en) * 2021-08-25 2022-08-30 燕山大学 Drawing die for rectangular-section deep-cylinder thin-wall metal part and machining process thereof

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN85200019U (en) * 1985-04-01 1985-11-10 清华大学 Small roller mold for jacking steel cylinder
US6490900B1 (en) * 2000-10-11 2002-12-10 American Cast Iron Pipe Company Pipe gauging and rounding apparatus and method
CN201076874Y (en) * 2007-08-17 2008-06-25 株洲硬质合金集团有限公司 Wire-drawing die
CN101357390A (en) * 2008-05-30 2009-02-04 浙江金盾压力容器有限公司 Roller die for processing seamless steel cylinder body
CN201239736Y (en) * 2008-07-07 2009-05-20 扬州诚德钢管有限公司 Roller of large-caliber thin-wall seamless steel pipe cold rolling mill
CN201632556U (en) * 2009-12-30 2010-11-17 燕山大学 Seamless Steel Cylinder Drawing Die

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN85200019U (en) * 1985-04-01 1985-11-10 清华大学 Small roller mold for jacking steel cylinder
US6490900B1 (en) * 2000-10-11 2002-12-10 American Cast Iron Pipe Company Pipe gauging and rounding apparatus and method
CN201076874Y (en) * 2007-08-17 2008-06-25 株洲硬质合金集团有限公司 Wire-drawing die
CN101357390A (en) * 2008-05-30 2009-02-04 浙江金盾压力容器有限公司 Roller die for processing seamless steel cylinder body
CN201239736Y (en) * 2008-07-07 2009-05-20 扬州诚德钢管有限公司 Roller of large-caliber thin-wall seamless steel pipe cold rolling mill
CN201632556U (en) * 2009-12-30 2010-11-17 燕山大学 Seamless Steel Cylinder Drawing Die

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
JP昭57-56118A 1982.04.03

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