CN107282678A - A kind of extrusion stretching shaping dies of high-performance magnesium-alloy light-wall pipe - Google Patents
A kind of extrusion stretching shaping dies of high-performance magnesium-alloy light-wall pipe Download PDFInfo
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- CN107282678A CN107282678A CN201710548594.3A CN201710548594A CN107282678A CN 107282678 A CN107282678 A CN 107282678A CN 201710548594 A CN201710548594 A CN 201710548594A CN 107282678 A CN107282678 A CN 107282678A
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- stretching
- die
- punch
- pin
- upper bolster
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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
- B21C25/00—Profiling tools for metal extruding
- B21C25/02—Dies
Abstract
The invention discloses a kind of extrusion stretching shaping dies of high-performance magnesium-alloy light-wall pipe, it includes upper bolster, punch-pin, clamp nut, centring ring, die shoe, Extruding die and stretching are enclosed, upper bolster bottom is provided with punch-pin by clamp nut coaxial vertical, die shoe is coaxially arranged with below upper bolster, positioning collar aperture is set on die shoe, centring ring is ridden upon in positioning collar aperture, a " u "-shaped hole is horizontally arranged with below positioning collar aperture, Extruding die or the stretching circle of several vertical piles are equipped with the " u "-shaped hole, and Extruding die, centring ring and stretching circle are located on same axis with punch-pin.It is of the invention compared with traditional cold drawing forming tubular product, improve cross section deformation rate, positioner can preferably keep the uniform of wall thickness simultaneously, thermal deformation improves the utilization rate of material, crystal grain has obtained significantly refining, use replaceable concave die device simultaneously, can be significantly easy workflow, it is not necessary to take out product.
Description
Technical field
The present invention relates to Metal Forming technique and forming technique field, more particularly to High-performance Magnesium Rare-earth Alloys thin-walled
The shaping of pipe and Strengthening and Toughening, and in particular to one kind is used for magnesium alloy materials extrusion stretching shaping dies.
Background technology
With the fast development of economic technology, the continuous improvement of people's living standard, various diseases also just come one after another.The heart
Vascular diseases are always to threaten one of important diseases of human health, and intravascular stent PCI is because its wound is small, expense is low,
Main Means as treatment coronary heart disease, and the treatment of peripheral artery disease and non-vascular intracavitary disease has gradually been expanded to.
But, traditional timbering material such as Ti-Ni alloy, stainless steel, cobalt-base alloys etc. be not biodegradable, and longer-term persistence, leads in vivo
Cause the patient that there are about is postoperative reangiostenosis occur.Magnesium alloy is as vascular stent material because being received with biodegradability
Increasing concern, but magnesium alloy plasticity is poor, and cold machine-shaping is difficult, and the tubing that traditional hot extrusion mode is processed is not
The requirement of support tubing can be met.
Research for Mg alloy thin wall pipe both at home and abroad has certain development, and Tsing-Hua University just adds multiple tracks with backward extrusion
The technique of secondary cold drawing, has shaped external diameter 3.14mm, wall thickness 0.32mm light-wall pipe.But cold drawing is limited in that material
It is relatively low that speed is received in the section of material.The researcher of Poland just with extruding plus the forming technology of dieless drawing, shapes external diameter
Speed is received up to 60% in 3.0mm, wall thickness 0.5mm microcapillary, the section of dieless drawing.
The content of the invention
It is an object of the invention to provide a kind of extrusion stretching shaping dies of high-performance magnesium-alloy light-wall pipe, the mould passes through
Cavity plate is changed, backward extrusion and the stretching of multi-pass isothermal is realized, produces wall thickness 0.3mm microcapillary, reach lifting magnesium-alloy tube
Combination property high-performance magnesium-alloy light-wall pipe extrusion stretching shaping.
In order to solve the problems existing in background technology, the present invention is to use following technical scheme：
The invention provides a kind of extrusion stretching shaping dies of high-performance magnesium-alloy light-wall pipe, it includes upper bolster, convex
Mould, clamp nut, centring ring, die shoe, Extruding die and stretching circle, upper bolster bottom is installed by clamp nut coaxial vertical
Have to be coaxially arranged with below punch-pin, upper bolster on die shoe, die shoe and positioning collar aperture is set, centring ring rides upon positioning collar aperture
It is interior, a " u "-shaped hole is horizontally arranged with below positioning collar aperture, Extruding die or several vertical piles are equipped with the " u "-shaped hole
Stretching is enclosed, and Extruding die, centring ring and stretching circle are located on same axis with punch-pin.
Described punch-pin be "T"-shaped revolving body, opened up on upper bolster change punch-pin used in chute, on punch-pin along
Longitudinal axis opens a through hole, and convex mould surface has one and through-hole diameter identical hole.
There is cylindrical mold cavity in described Extruding die, die cavity pattern draft is 1 °, has individual platform in the bottom of Extruding die
Rank.
The described circle cooperation that stretches all is complete with next groove stretched at the top of circle by each step for stretching circle bottom
Into；Each stretching circle feeding part uses bell shape, and output section is similarly bell shape.
Described upper bolster is the cylindrical upper bolster with " mouth " shape groove, and upper bolster lower end outer wall is provided with screw thread, on
Die holder surface is uniform-distribution with bellmouth.
The monnolithic case of described die shoe is obtained by "T"-shaped revolution, and transverse direction is set in the top half of die shoe
" u "-shaped hole, " u "-shaped bottom hole face opens up the groove matched with the step of Extruding die and stretching circle, in die shoe side level
A circular hole is opened up, the latter half of die shoe opens up out rectangular through holes.
Described centring ring is engaged with die shoe, does "T"-shaped revolving body, is ridden in the positioning collar aperture of die shoe.
After adopting the above technical scheme, the invention has the advantages that：
It is of the invention to improve cross section deformation rate compared with traditional cold drawing forming tubular product, while positioner can be more
Good holding wall thickness it is uniform, thermal deformation improves the utilization rate of material, and crystal grain has obtained significantly refining, while using can
Replace concave die device, can be significantly easy workflow, it is not necessary to take out product.
Brief description of the drawings
In order to illustrate more clearly about the embodiment of the present invention or technical scheme of the prior art, below will be to embodiment or existing
There is the accompanying drawing used required in technology description to be briefly described, it should be apparent that, drawings in the following description are only this
Some embodiments of invention, for those of ordinary skill in the art, on the premise of not paying creative work, can be with
Other accompanying drawings are obtained according to these accompanying drawings.
The product figure that Fig. 1 shapes for the extrusion stretching of the present invention；
Fig. 2 is Fig. 1 top view；
Fig. 3 installs the mould assembling schematic diagram of Extruding die for the present invention；
Fig. 4 installs the mould assembling schematic diagram of stretching circle for the present invention；
Fig. 5 is the structural representation of convex mould of the present invention；
Fig. 6 is the structural representation of Extruding die in the present invention；
Fig. 7 is stretches the structural representation of circle in the present invention；
Fig. 8 is the structural representation of upper bolster in the present invention；
Fig. 9 is the structural representation of die shoe in the present invention；
Figure 10 Fig. 9 left view；
Reference：
1- upper bolsters；2- punch-pin；3- clamp nuts；4- centring rings；5- die shoes；6- Extruding dies；7- stretching circles.
Embodiment
In order to make the purpose , technical scheme and advantage of the present invention be clearer, it is right below in conjunction with embodiment
The present invention is further elaborated.It should be appreciated that embodiment described herein is only to explain the present invention, and
It is not used in the restriction present invention.
Refer to Fig. 1-Figure 10, by blank for ф 10mmX10mm it is bar-shaped exemplified by, shape internal diameter for 6mm, wall thickness is
Exemplified by 0.3mm Mg alloy thin wall pipe, the step of illustrating the motion and experiment of mould.
The present embodiment mould assembling as shown in Figure 3, Figure 4, including upper bolster 1, punch-pin 2, clamp nut 3, centring ring 4,
Die shoe 5, Extruding die 6 and stretching circle 7；The bottom of upper bolster 1 is provided with punch-pin 2, upper bolster by the coaxial vertical of clamp nut 3
1 lower section, which is coaxially arranged with die shoe 5, die shoe 5, sets positioning collar aperture 51, and centring ring 4 is ridden upon in positioning collar aperture 51, positioning
The lower section of collar aperture 51 is horizontally arranged with a " u "-shaped hole 52, and Extruding die 6 or several vertical piles are equipped with the " u "-shaped hole 52
Stretching encloses 7, and Extruding die 6, centring ring 4 and stretching circle 7 are located on same axis with punch-pin 2；
As shown in figure 5, described punch-pin 2 is "T"-shaped revolving body, and it is more convenient when carrying out the replacing of punch-pin 2, in upper bolster
Opened up on 1 and change chute 11 used in punch-pin 2, only will need to be used to fasten the fastening of punch-pin 2 on upper bolster 1 when changing punch-pin 2
Nut 3 is backed out, and releases old punch-pin, new punch-pin is put into；As shown in figure 5, opening one along longitudinal axis on punch-pin 2
Individual through hole 21, be in order to prevent the product after extrusion stretching embrace form vacuum on punch-pin 2, it is difficult to remove and design；It is simultaneously
Easy to exhaust, there are one and through-hole diameter identical hole 22 in the surface of punch-pin 2；There is no the purpose of design work band 23 on punch-pin 2
As far as possible to stay in the product of backward extrusion on punch-pin 2, without take out product on the premise of carry out after drawing process,
It is simple and convenient.
As shown in fig. 6, described Extruding die 6 is plain cylindrical form Extruding die, inside there are cylindrical mold cavity 61, die cavity 61
Pattern draft is 1 °, has individual step 62 in the bottom of Extruding die 6, the purpose is to Extruding die 6 is matched somebody with somebody with die shoe 5
Close, keep uniform wall thickness.
As shown in Fig. 7, Fig. 4, the effect of described stretching circle 7 is that stretching circle 7 can be one in order to keep wall thickness deflection
Individual or multiple stretching circles 71,72,73 stack to complete object of experiment, but are put into a stretching circle too expense in die shoe 5 every time
When it is laborious, therefore be designed as " base building blocks " formula drawing process, two can be carried out or triplets are put into " U " of die shoe 5
In shape hole 52, stretching experiment is carried out, while permutation and combination can also be carried out, best deformation process is found, then per together
Secondary be sampled observes its Microstructure Performance.The cooperation of wherein stretching circle 71,72,73 is all the platform by each stretching circle bottom
Rank 70 completes with the groove 701 at next top of stretching circle 72；The feeding part 791,792,793 of stretching circle 71,72,73 is adopted
The shaping being gradually reduced with bell shape, calibrating strap D1, D2, D3 size, output section 781,782,783 is similarly horn mouth
Shape, then tensioning member from stretching circle 71 enter it is next stretching circle 72, then from stretching circle 72 enter it is next stretching circle 73, equally with
Backward extrusion process is identical.
As shown in figure 8, described upper bolster 1 is the cylindrical upper bolster with " mouth " shape groove, the lower end outer wall of upper bolster 1 is set
Screw thread 12 is equipped with, the mode of screw threads for fastening punch-pin is designed to, because the extruding force of shaping is relatively small, to the ability to bear of mould
It is required that not being too high, and easy to loading and unloading；Upper bolster surface is also uniform-distribution with bellmouth (figure not depending on showing) simultaneously, for by upper mould
Seat 1 is fixed on extruder.
As shown in figure 9, described die shoe 5 realizes the replaceability of Extruding die.The monnolithic case of die shoe 5 be by
"T"-shaped revolution is obtained, and sets horizontal " u "-shaped hole 52 in the top half of die shoe 5, the bottom surface of " u "-shaped hole 52 opens up and extruded
The groove that matches of step of cavity plate 6 and stretching circle 7,53 realize the uniform of wall thickness.Extruding die is changed for convenience simultaneously
6, a circular hole 54 is opened up in the side level of die shoe 5, need to only be released Extruding die 6 with small pole during replacing.Due to drawing
Material is identical with mold movement direction when stretching, so the latter half of die shoe 5 opens up out rectangular through holes 55, convenient observation shaping
With taking out light-wall pipe.
As shown in Figure 3, Figure 4, described centring ring 4 is engaged with die shoe 5, due to light-wall pipe it is crucial that control wall
Thickness, the accessible purpose of design of centring ring 4：(1) wall thickness can be controlled；(2) when punch-pin 2 is by centring ring 4, it can protect
Punch-pin 2, is prevented because unstability caused by punch-pin 2 is long.At the same time, when changing Extruding die 6, punch-pin 2 needs backhaul, because
This centring ring 4 cannot be interference fit, and be made as "T"-shaped revolving body, ride in the positioning collar aperture 51 of die shoe 5, when convex
Centring ring 4 can be taken up during 2 backhaul of mould.
As Figure 1-4, after the completion of mould assembling, what the first step was carried out is backward extrusion process, and what experiment was carried out is isothermal
Extrusion process, i.e. experimentation are carried out in heating furnace, are tested on universal testing machine.Blank 10 is put into mould before experiment
It is interior, together heated with mould, by taking 350 DEG C of experimental temperature as an example, a diameter of 6mm punch-pin 2 is entered through centring ring 4 extrudes recessed
Carry out backward extrusion technology in mould 6, backward extrusion cup shell 101 is kept on file thick 3mm, obtains the product that wall thickness is 2mm.
Cup shell 101 is taken away in the backhaul of punch-pin 2, releases Extruding die 6, is put into stretching circle 7, by 6 stretchings, each stretching
The calibrating strap size of circle 7 is ф 9mm, ф 8.4mm, ф 7.8mm, ф 7.2mm, ф 6.8mm, ф 6.6mm, can will be many during experiment
The individual superposition of stretching circle 7 is used, and finally gives the band bottom magnesium alloy extruded tube 102 that wall thickness is 0.3mm.
The demoulding is stripped method using the temperature difference, i.e. the temperature of heating furnace is improved into 60 DEG C, due to the heat sensitivity of magnesium alloy, rises
Warm speed will be faster than punch-pin 2, further according to principle of expanding with heat and contracting with cold, and the magnesium alloy extruded tube 102 bottom of with can be removed.
The excision of bottom 103 is obtained into Mg alloy thin wall pipe (figure is not depending on going out).
The concrete operation step of the present embodiment is：
(1) bar-shaped blanking, size is ф 10mmX10mm；
(2) homogenization heat treatment；
(3) orthogonal test is designed, the variable element of this experiment is：Push speed, mold temperature, the selection of lubricant, because
To be isothermal experiment, so the temperature of mould and blank are identicals, 200 DEG C of design, 250 DEG C, 300 DEG C, 350 DEG C, 400 DEG C it is several
Individual temperature parameter；Push speed selection 0.1mm/s, 0.5mm/s, 1mm/s；Lubricant selection oil machine graphite, talcum powder, are carried out real
Test, blank 10 will be got out and be put into the Extruding die 6 of mould, mould is put into the heater box of universal material experimental machine and added
Heat is to 350 DEG C, and constant temperature squeezes out band bottom cup shell 101；
(4) Extruding die 6 is released, cup shell 101 is sticked on punch-pin 2 with the backhaul of punch-pin 2, is now put into stretching
Circle 7, being thinned for wall thickness is carried out to the cup shell 101 squeezed out；
(5) two or three stretching circles can be stacked to be stretched, each stretched equal sampling of next sample carries out hard
Degree or stretching test；
(6) by 6 stretchings, the magnesium alloy extruded tube 102 bottom of with is obtained, progress is cut bottom 103 and handled, and obtains target tube
Material, without the Mg alloy thin wall pipe at bottom, completes a working cycles, carries out microstructure observation, obtain mechanical property.
A kind of extrusion stretching shaping of high-performance magnesium-alloy light-wall pipe of the present invention adds cold with traditional light-wall pipe forward extrusion
Drawing forming compares, and has the advantages that：
(1) traditional forward extrusion base is cumbersome, it is necessary to by blank perforate, and due to the limitation of forward extrusion, experiment is needed
To be carried out in horizontal extruder, or need the design of designed, designed extruder, such as Tsing-Hua University Fang Gang.And base of the present invention
Simply, it is easy to operate, it is adapted to compared with multi-environment, can be tested in universal material experimental machine.
(2) crystal grain is more refined.The experiment of the present invention have passed through multiple extrusion stretching, and crystal grain is substantially refined, and can be obtained
Obtain high fine and close structure.Traditional forward extrusion step is less, it is impossible to reach the effect of multi-pass extruding.
(3) accurate positioning.This invention takes multiple positioning modes, it is ensured that wall thickness it is uniform.And traditional forward extrusion is determined
Position mode is relatively simple, easily causes the uneven of wall thickness or even fracture.
(4) forming effect is good.The present invention is carried out at high temperature, and the deformation performance of magnesium alloy at high temperature is done than normal temperature
Much, thus deform it is more uniform, careful, forming effect is preferable；Traditional forward extrusion shaping, will typically obtain light-wall pipe needs
Carry out multi-pass cold drawing, the morphotropism of magnesium alloy is poor under low temperature, the phenomenon broken easily occurs, at the same under low temperature material extension
Rate is relatively low.
(5) replaceable cavity plate.Traditional method and step is cumbersome, and the method for the replaceable cavity plate that the present invention is used is greatly
Shorten the flow of experiment.
It is obvious to a person skilled in the art that the invention is not restricted to the details of above-mentioned one exemplary embodiment, Er Qie
In the case of without departing substantially from spirit or essential attributes of the invention, the present invention can be realized in other specific forms.Therefore, no matter
From the point of view of which point, embodiment all should be regarded as exemplary, and be nonrestrictive, the scope of the present invention is by appended power
Profit is required rather than described above is limited, it is intended that all in the implication and scope of the equivalency of claim by falling
Change is included in the present invention.
Moreover, it will be appreciated that although the present specification is described in terms of embodiments, not each embodiment is only wrapped
Containing an independent technical scheme, this narrating mode of specification is only that for clarity, those skilled in the art should
Using specification as an entirety, the technical solutions in the various embodiments may also be suitably combined, forms those skilled in the art
It may be appreciated other embodiment.
Claims (7)
1. a kind of extrusion stretching shaping dies of high-performance magnesium-alloy light-wall pipe, it is characterised in that：It comprising upper bolster, punch-pin,
Clamp nut, centring ring, die shoe, Extruding die and stretching circle, upper bolster bottom is provided with by clamp nut coaxial vertical
It is coaxially arranged with below punch-pin, upper bolster on die shoe, die shoe and positioning collar aperture is set, centring ring is ridden upon in positioning collar aperture,
A " u "-shaped hole is horizontally arranged with below positioning collar aperture, the stretching of Extruding die or several vertical piles is equipped with the " u "-shaped hole
Enclose, and Extruding die, centring ring and stretching circle are located on same axis with punch-pin.
2. a kind of extrusion stretching shaping dies of high-performance magnesium-alloy light-wall pipe according to claim 1, it is characterised in that：
Described punch-pin is "T"-shaped revolving body, and the chute changed used in punch-pin is opened up on upper bolster, is hung down on punch-pin along longitudinal axis
A through hole is headed straight for, convex mould surface has one and through-hole diameter identical hole.
3. a kind of extrusion stretching shaping dies of high-performance magnesium-alloy light-wall pipe according to claim 1, it is characterised in that：
There is cylindrical mold cavity in described Extruding die, die cavity pattern draft is 1 °, has individual step in the bottom of Extruding die.
4. a kind of extrusion stretching shaping dies of high-performance magnesium-alloy light-wall pipe according to claim 1, it is characterised in that：
Described stretching, which is enclosed, coordinates the step for being all to enclose bottom by each stretching to be completed with the groove at the top of next stretching circle；Each
Stretching circle feeding part uses bell shape, and output section is similarly bell shape.
5. a kind of extrusion stretching shaping dies of high-performance magnesium-alloy light-wall pipe according to claim 1, it is characterised in that：
Described upper bolster is the cylindrical upper bolster with " mouth " shape groove, and upper bolster lower end outer wall is provided with screw thread, upper bolster surface
It is uniform-distribution with bellmouth.
6. a kind of extrusion stretching shaping dies of high-performance magnesium-alloy light-wall pipe according to claim 1, it is characterised in that：
The monnolithic case of described die shoe is obtained by "T"-shaped revolution, and horizontal " u "-shaped hole is set in the top half of die shoe,
" u "-shaped bottom hole face opens up the groove matched with the step of Extruding die and stretching circle, and in die shoe side, level opens up a circle
Hole, the latter half of die shoe opens up out rectangular through holes.
7. a kind of extrusion stretching shaping dies of high-performance magnesium-alloy light-wall pipe according to claim 1, it is characterised in that：
Described centring ring is engaged with die shoe, does "T"-shaped revolving body, is ridden in the positioning collar aperture of die shoe.
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| CN201710548594.3A CN107282678B (en) | 2017-07-03 | 2017-07-03 | A kind of extrusion stretching shaping dies of high-performance magnesium-alloy thin-wall tube |
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| CN201710548594.3A CN107282678B (en) | 2017-07-03 | 2017-07-03 | A kind of extrusion stretching shaping dies of high-performance magnesium-alloy thin-wall tube |
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| CN107282678B CN107282678B (en) | 2019-04-09 |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110052847A (en) * | 2019-05-21 | 2019-07-26 | 佛山市南海万格士机械设备有限公司 | A kind of al profile extrusion line |
| CN113042559A (en) * | 2021-03-16 | 2021-06-29 | 中北大学 | Thinning, stretching and extruding composite forming method for large-height-diameter-ratio cylinder |
| CN113059016A (en) * | 2021-03-16 | 2021-07-02 | 中北大学 | Thinning, stretching and extruding composite forming die for large-height-diameter ratio cylinder |
| CN114713654A (en) * | 2022-04-12 | 2022-07-08 | 中北大学 | Short-process severe plastic deformation preparation method of large-size rare earth magnesium alloy high-performance ingot blank |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114713654A (en) * | 2022-04-12 | 2022-07-08 | 中北大学 | Short-process severe plastic deformation preparation method of large-size rare earth magnesium alloy high-performance ingot blank |
| CN114713654B (en) * | 2022-04-12 | 2023-10-20 | 中北大学 | Short-process severe plastic deformation preparation method of large-specification rare earth magnesium alloy high-performance ingot blank |
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|---|---|
| CN107282678B (en) | 2019-04-09 |
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