CN201632556U - Drawing die for seamless steal cylinders - Google Patents
Drawing die for seamless steal cylinders Download PDFInfo
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- CN201632556U CN201632556U CN2009202832505U CN200920283250U CN201632556U CN 201632556 U CN201632556 U CN 201632556U CN 2009202832505 U CN2009202832505 U CN 2009202832505U CN 200920283250 U CN200920283250 U CN 200920283250U CN 201632556 U CN201632556 U CN 201632556U
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- running roller
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- steel cylinder
- seamless steel
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Abstract
The utility model provides a drawing die for seamless steel cylinders, which can reduce the drawing force, improve the pass processing efficiency and the production efficiency and prolong the service life of a die, and is particularly applicable to drawing and forming of thin-wall seamless steel cylinders. The drawing die for seamless steel cylinders comprises more than two layers of roller dies, wherein each roller die layer comprises at least two rollers; a roller bus of each roller die layer is enclosed into a fundamentally closed roller die hole; the roller die holes of the roller die layers are coaxial, and the apertures of all roller die layers are gradually reduced from beginning to end along the processing direction of seamless steel cylinders; and the roller die holes are not round except the roller die hole of the last layer.
Description
Technical field
The utility model relates to a kind of stretch drawing die for seamless steel cylinder, is specially adapted to the stretch forming of thin-wall seamless steel cylinder, belongs 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 is as the blank drawn hydraulic press stretched required gas cylinder of stretch drawing die for seamless steel cylinder.The gas cylinder that this method is shaped has bottle intensity height, 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 by 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 by 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.
The utility model content
The purpose of this utility model provides a kind of tensile force that reduces, and improves pass reduction and production efficiency, prolongs die life, is 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 help 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, by each circle mould, by 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, uses round-corner transition between adjacent each band, the bus of calibrating strap is curve (as elliptic curve, parabolic curve, hyperbola curve or other curve); The minimum diameter of circle mould is on the calibrating strap.In the drawing process, by the circle mould time, metal enters the calibrating strap that bus is a curve from the compression band again through fillet, 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 schematic diagram.
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 the utility model centre circle mould.
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 in the utility model.
Fig. 5 is a schematic diagram of the present utility model.
When Fig. 6 is stretching φ 406mm * 6mm seamless gas cylinder, single track existing circle mould and single track the utility model circle mould 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 utility model tensile force finite element modelling curve comparison diagram through complete operation.
The specific embodiment
For further understanding technology contents of the present utility model, characteristics and effect, exemplify following examples now, and conjunction with figs. is described in detail as follows.
Referring to Fig. 5, stretch drawing die for seamless steel cylinder of the present utility model 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 uses steel cylinder blank 2 as stretching by hot thick cyclinder.Steel cylinder blank 2 is hot steel or aluminium alloy.When steel cylinder blank 2 during successively by 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 drift 1 effect.
Each encloses mould and each layer running roller mould is arranged by different level along machine direction.The bus that the utility model 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 enters 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 in the utility model, 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 the 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, adopts 3 roads in this example.Each circle nib footpath, road (minimum diameter) reduces gradually along the drift direction of motion.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, by 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 utlity model has following advantage and good effect:
1, in the drawing process, through the circle mould time, the interim form that metal is with the process fillet to enter elliptic arc from compression again 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 to produce simultaneously lateral flow carrying out longitudinal flow. Such process layout is conducive to metal flow, so that do not reducing under the attenuate amount prerequisite, 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 (7)
1. 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, it is characterized in that: except that the running roller nib of last one deck, the running roller nib of other each layer is not circular.
2. stretch drawing die for seamless steel cylinder as claimed in claim 1 is characterized in that: except that the running roller mould of last one deck, the bus of other each layer middle rolls is elliptic curve, parabolic curve or hyperbola curve.
3. stretch drawing die for seamless steel cylinder as claimed in claim 2 is characterized in that: 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.
4. stretch drawing die for seamless steel cylinder as claimed in claim 1 it is characterized in that: further comprising 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.
5. stretch drawing die for seamless steel cylinder as claimed in claim 4 is characterized in that: along the circle mold shaft to, circle mould endoporus has lubricated band, compression band, calibrating strap, outlet band, uses round-corner transition between adjacent each band; The bus of calibrating strap is a curve; The minimum diameter of circle mould is on the calibrating strap.
6. stretch drawing die for seamless steel cylinder as claimed in claim 5 is characterized in that: the bus of circle mould calibrating strap is elliptic curve, parabolic curve or hyperbola curve.
7. stretch drawing die for seamless steel cylinder as claimed in claim 1 is characterized in that: the running roller in each layer running roller mould is circumferentially evenly arranged along the running roller nib.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009202832505U CN201632556U (en) | 2009-12-30 | 2009-12-30 | Drawing die for seamless steal cylinders |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009202832505U CN201632556U (en) | 2009-12-30 | 2009-12-30 | Drawing die for seamless steal cylinders |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201632556U true CN201632556U (en) | 2010-11-17 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2009202832505U Expired - Lifetime CN201632556U (en) | 2009-12-30 | 2009-12-30 | Drawing die for seamless steal cylinders |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201632556U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101767150B (en) * | 2009-12-30 | 2012-09-05 | 燕山大学 | Stretch drawing die for seamless steel cylinder |
-
2009
- 2009-12-30 CN CN2009202832505U patent/CN201632556U/en not_active Expired - Lifetime
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101767150B (en) * | 2009-12-30 | 2012-09-05 | 燕山大学 | Stretch drawing die for seamless steel cylinder |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| AV01 | Patent right actively abandoned |
Granted publication date: 20101117 Effective date of abandoning: 20091230 |