CN107282678B - A kind of extrusion stretching shaping dies of high-performance magnesium-alloy thin-wall tube - Google Patents

A kind of extrusion stretching shaping dies of high-performance magnesium-alloy thin-wall tube Download PDF

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Publication number
CN107282678B
CN107282678B CN201710548594.3A CN201710548594A CN107282678B CN 107282678 B CN107282678 B CN 107282678B CN 201710548594 A CN201710548594 A CN 201710548594A CN 107282678 B CN107282678 B CN 107282678B
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China
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die holder
die
stretching
punch
pin
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CN201710548594.3A
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Chinese (zh)
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CN107282678A (en
Inventor
方敏
闫钊鸣
张治民
杨勇彪
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中北大学
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    • BPERFORMING OPERATIONS; TRANSPORTING
    • B21MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21CMANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
    • B21C25/00Profiling tools for metal extruding
    • B21C25/02Dies

Abstract

The invention discloses a kind of extrusion stretching shaping dies of high-performance magnesium-alloy thin-wall tube, it includes upper die holder, punch-pin, fastening nut, locating ring, lower die holder, Extruding die and stretching circle, upper die holder bottom is equipped with punch-pin by fastening nut coaxial vertical, lower die holder is coaxially arranged with below upper die holder, setting positioning collar aperture on lower die holder, locating ring rides upon in positioning collar aperture, a " u "-shaped hole is horizontally arranged with below positioning collar aperture, the stretching circle of Extruding die or several vertical piles is equipped in the " u "-shaped hole, and Extruding die, locating ring and stretching circle are located on same axis with punch-pin.The present invention is compared with traditional cold drawing forming tubular product, improve cross section deformation rate, positioning device 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, do not need to take out product.

Description

A kind of extrusion stretching shaping dies of high-performance magnesium-alloy thin-wall tube

Technical field

The present invention relates to Metal Forming technique and forming technique fields, in particular to High-performance Magnesium Rare-earth Alloys thin-walled The forming and Strengthening and Toughening of pipe, and in particular to one kind is used for magnesium alloy materials extrusion stretching shaping dies.

Background technique

With the fast development of economic technology, continuous improvement of people's living standards, various diseases also just come one after another.The heart Vascular diseases are always one of the important diseases for threatening human health, and intravascular stent interventional therapy is because its wound is small, expense is low, As the main means for the treatment of coronary heart disease, and the treatment of peripheral artery disease and the intracavitary disease of non-vascular has gradually been expanded to. But traditional timbering material such as Ti-Ni alloy, stainless steel, cobalt-base alloys etc. is not biodegradable, longer-term persistence, leads in vivo Cause there are about patient postoperative there is reangiostenosis.Magnesium alloy is as vascular stent material because receiving with biodegradability More and more concerns, but magnesium alloy plasticity is poor, and cold machine-shaping is difficult, and the tubing that traditional hot extrusion mode processes is not It is able to satisfy the requirement of bracket tubing.

There is certain development for the research of Mg alloy thin wall pipe both at home and abroad, Tsinghua University just adds multiple tracks with backward extrusion The technique of secondary cold drawing has shaped outer diameter 3.14mm, the thin-wall tube of wall thickness 0.32mm.But cold drawing is limited in that material It is lower that rate is received in the section of material.The researcher of Poland just with the forming technology for adding dieless drawing is squeezed, shapes outer diameter Rate is received up to 60% in 3.0mm, the microcapillary of wall thickness 0.5mm, the section of dieless drawing.

Summary of the invention

The object of the present invention is to provide a kind of extrusion stretching shaping dies of high-performance magnesium-alloy thin-wall tube, which passes through Cavity plate is replaced, realizes that backward extrusion and multi-pass isothermal stretch, produces the microcapillary of wall thickness 0.3mm, reach promotion magnesium-alloy tube Comprehensive performance high-performance magnesium-alloy thin-wall tube extrusion stretching forming.

In order to solve the problems existing in background technology, the present invention adopts the following technical scheme:

The present invention provides a kind of extrusion stretching shaping dies of high-performance magnesium-alloy thin-wall tube, it includes upper die holder, convex Mould, fastening nut, locating ring, lower die holder, Extruding die and stretching circle, upper die holder bottom is installed by fastening nut coaxial vertical There is punch-pin, lower die holder is coaxially arranged with below upper die holder, setting positioning collar aperture, locating ring ride upon positioning collar aperture on lower die holder It is interior, it is horizontally arranged with a " u "-shaped hole below positioning collar aperture, Extruding die or several vertical piles are equipped in the " u "-shaped hole Circle is stretched, and Extruding die, locating ring and stretching circle are located on same axis with punch-pin.

The punch-pin be "T"-shaped revolving body, opened up on upper die holder replacement punch-pin used in sliding slot, on punch-pin along Longitudinal axis opens a through-hole, and convex mould surface has a hole identical with through-hole diameter.

There is cylindrical mold cavity in the Extruding die, type chamber pattern draft is 1 °, has a platform in the bottom end of Extruding die Rank.

The stretching circle cooperation is all complete with next groove for stretching circle top by each step for stretching circle bottom At;Each stretching circle feeding part uses bell shape, and discharging portion is similarly bell shape.

The upper die holder is the cylindrical upper die holder with " mouth " shape slot, and upper die holder lower end outer wall is provided with screw thread, on Die holder surface is uniform-distribution with bellmouth.

The monnolithic case of the lower die holder is obtained by "T"-shaped revolution, lateral in the top half setting of lower die holder " u "-shaped hole, " u "-shaped hole bottom surface open up the groove to match with the step of Extruding die and stretching circle, in lower die holder side level A circular hole is opened up, the lower half portion of lower die holder opens up out rectangular through holes.

The locating ring is matched with lower die holder, does "T"-shaped revolving body, is ridden in the positioning collar aperture of lower die holder.

After adopting the above technical scheme, the invention has the following advantages:

The present invention improves cross section deformation rate, while positioning device can be more compared with traditional cold drawing forming tubular product Good keeps the uniform of wall thickness, and 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, do not need to take out product.

Detailed description of the invention

In order to more clearly explain the embodiment of the invention or the technical proposal in the existing technology, to embodiment or will show below There is attached drawing needed in technical description to be briefly described, it should be apparent that, the accompanying drawings in the following description is only this Some embodiments of invention for those of ordinary skill in the art without creative efforts, can be with It obtains other drawings based on these drawings.

Fig. 1 is the product figure that extrusion stretching of the invention shapes;

Fig. 2 is the top view of Fig. 1;

Fig. 3 is the mold assembling schematic diagram of present invention installation Extruding die;

Fig. 4 is the mold assembling schematic diagram that present invention installation stretches circle;

Fig. 5 is the structural schematic diagram of convex mould of the present invention;

Fig. 6 is the structural schematic diagram of Extruding die in the present invention;

Fig. 7 is the structural schematic diagram that circle is stretched in the present invention;

Fig. 8 is the structural schematic diagram of upper die holder in the present invention;

Fig. 9 is the structural schematic diagram of lower die holder in the present invention;

The left view of Figure 10 Fig. 9;

Appended drawing reference:

1- upper die holder;2- punch-pin;3- fastening nut;4- locating ring;5- lower die holder;6- Extruding die;7- stretches circle.

Specific embodiment

In order to make the objectives, technical solutions, and advantages of the present invention clearer, right below in conjunction with specific embodiment The present invention is further elaborated.It should be appreciated that the specific embodiments described herein are only to explain the present invention, and It is not used in the restriction present invention.

Please refer to Fig. 1-Figure 10, by blank be ф 10mmX10mm it is rodlike for, shaping internal diameter is 6mm, and wall thickness is For the Mg alloy thin wall pipe of 0.3mm, the step of illustrating the movement and experiment of mold.

The present embodiment mold assembly as shown in Figure 3, Figure 4, including upper die holder 1, punch-pin 2, fastening nut 3, locating ring 4, Lower die holder 5, Extruding die 6 and stretching circle 7;1 bottom of upper die holder is equipped with punch-pin 2, upper die holder by 3 coaxial vertical of fastening nut 1 lower section is coaxially arranged with lower die holder 5, and setting positioning collar aperture 51 on lower die holder 5, locating ring 4 rides upon in positioning collar aperture 51, positioning It is horizontally arranged with a " u "-shaped hole 52 below collar aperture 51, Extruding die 6 or several vertical piles are equipped in the " u "-shaped hole 52 Circle 7 is stretched, and Extruding die 6, locating ring 4 and stretching circle 7 are located on same axis with punch-pin 2;

As shown in figure 5, the punch-pin 2 is "T"-shaped revolving body, and it is more convenient when carrying out punch-pin 2 and replacing, in upper die holder Sliding slot 11 used in replacement punch-pin 2 is opened up on 1, only will need to be used to fasten the fastening of punch-pin 2 on upper die holder 1 when replacing punch-pin 2 Nut 3 is backed out, and old punch-pin is released, and new punch-pin is put into;As shown in figure 5, opening one along longitudinal axis on punch-pin 2 A through-hole 21 is that the product after extrusion stretching is embraced and forms vacuum on punch-pin 2 in order to prevent, it is difficult to remove and design;It is simultaneously There is a hole 22 identical with through-hole diameter on easy to exhaust, 2 surface of punch-pin;There is no the purpose of design work band 23 on punch-pin 2 It is as far as possible to stay in the product of backward extrusion on punch-pin 2, the drawing process after being carried out under the premise of not having to take out product, It is simple and convenient.

As shown in fig. 6, the Extruding die 6 is plain cylindrical form Extruding die, inside there are cylindrical mold cavity 61, type chamber 61 Pattern draft is 1 °, has a step 62 in the bottom end of Extruding die 6, the purpose is to match Extruding die 6 with lower die holder 5 It closes, keeps uniform wall thickness.

As shown in Fig. 7, Fig. 4, the effect of the stretching circle 7 is to keep wall thickness deflection, and stretching circle 7 can be one A or multiple stretching circles 71,72,73 stack to complete object of experiment, but are put into a stretching circle too expense in lower die holder 5 every time When it is laborious, therefore be designed as " build building blocks " formula drawing process, two can be carried out or triplets are put into " U " of lower die holder 5 In shape hole 52, stretching experiment is carried out, while permutation and combination can also be carried out, find best deformation process, then per together Secondary be sampled observes its Microstructure Performance.The cooperation for wherein stretching circle 71,72,73 is all by each platform for stretching circle bottom Rank 70 is completed with next groove 701 for stretching 72 top of circle;The feeding part 791,792,793 for stretching circle 71,72,73 is adopted The forming being gradually reduced with bell shape, calibrating strap D1, D2, D3 size, discharging portion 781,782,783 are similarly horn mouth Shape, then tensioning member from stretch circle 71 enter next stretchings circle 72, then from stretch circle 72 enter next stretching enclose 73, equally with Backward extrusion process is identical.

As shown in figure 8, the upper die holder 1 is the cylindrical upper die holder with " mouth " shape slot, 1 lower end outer wall of upper die holder is set It is equipped with screw thread 12, is designed to the mode of screw threads for fastening punch-pin, since the extruding force of forming is relatively small, to the ability to bear of mold It is required that not being too high, and easy to loading and unloading;Upper mold seating face is also uniform-distribution with bellmouth (figure is not depending on showing) simultaneously, is used to upper mold Seat 1 is fixed on extruder.

As shown in figure 9, the lower die holder 5 realizes the replaceability of Extruding die.The monnolithic case of lower die holder 5 be by "T"-shaped revolution obtains, and in the lateral " u "-shaped hole 52 of the top half setting of lower die holder 5,52 bottom surface of " u "-shaped hole opens up and squeezes Cavity plate 6 and the groove that matches of step for stretching circle 7,53 realize the uniform of wall thickness.Replace Extruding die for convenience simultaneously 6, a circular hole 54 is opened up in 5 side level of lower die holder, and when replacement need to only be released Extruding die 6 with small pole.Due to drawing Material is identical as mold movement direction when stretching, so the lower half portion of lower die holder 5 opens up out rectangular through holes 55, observation is facilitated to shape With taking-up thin-wall tube.

As shown in Figure 3, Figure 4, the locating ring 4 is matched with lower die holder 5, due to thin-wall tube it is crucial that control wall The accessible purpose of the design of locating ring 4: thickness (1) can control wall thickness;(2) it when punch-pin 2 passes through locating ring 4, can protect Punch-pin 2 prevents because of unstability caused by punch-pin 2 is too long.At the same time, when replacing Extruding die 6, punch-pin 2 needs backhaul, because This locating ring 4 cannot be interference fit, and be made as "T"-shaped revolving body, ride in the positioning collar aperture 51 of lower die holder 5, when convex Locating ring 4 can be taken up when 2 backhaul of mould.

As shown in Figs 1-4, after the assembly is completed, what the first step carried out is backward extrusion process to mold, and test progress is isothermal Extrusion process, i.e. experimentation carry out in heating furnace, test on universal testing machine.Blank 10 is put into mold before experiment It is interior, heated together with mold, for 350 DEG C of experimental temperature, diameter be 6mm punch-pin 2 pass through locating ring 4 enter squeeze it is recessed Carry out backward extrusion technology in mould 6, backward extrusion cup shell 101 is kept on file thick 3mm, and the product that wall thickness is 2mm is obtained.

Cup shell 101 is taken away in 2 backhaul of punch-pin, releases Extruding die 6, is put into stretching circle 7, stretches by 6 times, each stretching The calibrating strap of circle 7 is having a size of ф 9mm, ф 8.4mm, ф 7.8mm, ф 7.2mm, ф 6.8mm, ф 6.6mm, can will be more when experiment A 7 superposition of stretching circle uses, and finally obtains the band bottom magnesium alloy extruded tube 102 that wall thickness is 0.3mm.

Demoulding demoulds method using the temperature difference, that is, the temperature of heating furnace is improved 60 DEG C, due to the heat sensitivity of magnesium alloy, is risen Warm speed will be faster than punch-pin 2, and further according to thermal expansion and contraction principle, 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 does not regard out).

The concrete operation step of the present embodiment are as follows:

(1) rodlike blanking, having a size of ф 10mmX10mm;

(2) homogenization heat treatment;

(3) orthogonal test, the variable element of this experiment are designed are as follows: pushing speed, mold temperature, the selection of lubricant, because To be isothermal experiment, thus the temperature of mold with blank be it is identical, 200 DEG C of design, 250 DEG C, 300 DEG C, 350 DEG C, 400 DEG C it is several A temperature parameter;It pushes speed and selects 0.1mm/s, 0.5mm/s, 1mm/s;Lubricant selects oil machine graphite, talcum powder, carries out real It tests, blank 10 will be got out and be put into the Extruding die 6 of mold, mold is put into the heater box of universal material experimental machine and is added For heat to 350 DEG C, constant temperature squeezes out band bottom cup shell 101;

(4) Extruding die 6 is released, cup shell 101 sticks on punch-pin 2 with the backhaul of punch-pin 2, is put into stretching at this time Circle 7 carries out being thinned for wall thickness 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, carries out cutting the processing of bottom 103, obtains target tube Material completes a working cycles without the Mg alloy thin wall pipe at bottom, carries out microstructure observation, obtains mechanical property.

A kind of extrusion stretching forming of high-performance magnesium-alloy thin-wall tube of the invention adds cold with traditional thin-wall tube forward extrusion Drawing forming compares, and has the advantages that

(1) traditional forward extrusion base is cumbersome, needs blank aperture, and due to the limitation of forward extrusion, experiment is needed It to be carried out in horizontal extruder, or need designed, designed extruder, such as the design of Tsinghua University Fang Gang.And base of the present invention Simply, easy to operate, it is adapted to more multi-environment, can be tested in universal material experimental machine.

(2) crystal grain more refines.Experiment of the invention have passed through multiple extrusion stretching, and crystal grain is obviously refined, and can obtain Obtain high-densit structure.Traditional forward extrusion step is less, cannot achieve the effect that multi-pass squeezes.

(3) accurate positioning.This invention takes multiple positioning modes, guarantee the uniform of wall thickness.And traditional forward extrusion is determined Position mode is relatively simple, be easy to cause the uneven of wall thickness or even fracture.

(4) forming effect is good.The present invention carries out at high temperature, and the deformation performance of magnesium alloy at high temperature is done than room temperature Much, therefore deformation is more uniform, careful, and forming effect is preferable;Traditional forward extrusion forming, will generally obtain thin-wall tube needs Carry out multi-pass cold drawing, the morphotropism of magnesium alloy is poor under low temperature, the phenomenon that easily breaking, at the same under low temperature material extension Rate is lower.

(5) replaceable cavity plate.Traditional method and step is cumbersome, and the method for the replaceable cavity plate that the present invention uses is greatly Shorten the process of experiment.

It is obvious to a person skilled in the art that invention is not limited to the details of the above exemplary embodiments, Er Qie In the case where 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, the present embodiments are to be considered as illustrative and not restrictive, and the scope of the present invention is by appended power Benefit requires rather than above description limits, it is intended that all by what is fallen within the meaning and scope of the equivalent elements of the claims Variation is included within the present invention.

In addition, it should be understood that although this specification is described in terms of embodiments, but not each embodiment is only wrapped Containing an independent technical solution, this description of the specification is merely for the sake of clarity, and those skilled in the art should It considers the specification as a whole, the technical solutions in the various embodiments may also be suitably combined, forms those skilled in the art The other embodiments being understood that.

Claims (6)

1. a kind of extrusion stretching shaping dies of high-performance magnesium-alloy thin-wall tube, it is characterised in that: it include upper die holder, punch-pin, Fastening nut, locating ring, lower die holder, Extruding die and stretching circle, upper die holder bottom is equipped with by fastening nut coaxial vertical Punch-pin, upper die holder lower section are coaxially arranged with lower die holder, and setting positioning collar aperture on lower die holder, locating ring rides upon in positioning collar aperture, It is horizontally arranged with a " u "-shaped hole below positioning collar aperture, the stretching of Extruding die or several vertical piles is equipped in the " u "-shaped hole Circle, and Extruding die, locating ring and stretching circle are located on same axis with punch-pin, the stretching circle cooperation is all by each The step for stretching circle bottom stretches what the groove at the top of enclosing was completed with next;Each stretching circle feeding part uses toroidal Shape, discharging portion are similarly bell shape, the forming that calibrating strap size is gradually reduced.
2. a kind of extrusion stretching shaping dies of high-performance magnesium-alloy thin-wall tube according to claim 1, it is characterised in that: The punch-pin is "T"-shaped revolving body, and sliding slot used in replacement punch-pin is opened up on upper die holder, is hung down on punch-pin along longitudinal axis A through-hole directly is opened, convex mould surface has a hole identical with through-hole diameter.
3. a kind of extrusion stretching shaping dies of high-performance magnesium-alloy thin-wall tube according to claim 1, it is characterised in that: There is cylindrical mold cavity in the Extruding die, type chamber pattern draft is 1 °, has a step in the bottom end of Extruding die.
4. a kind of extrusion stretching shaping dies of high-performance magnesium-alloy thin-wall tube according to claim 1, it is characterised in that: The upper die holder is the cylindrical upper die holder with " mouth " shape slot, and upper die holder lower end outer wall is provided with screw thread, upper mold seating face It is uniform-distribution with bellmouth.
5. a kind of extrusion stretching shaping dies of high-performance magnesium-alloy thin-wall tube according to claim 1, it is characterised in that: The monnolithic case of the lower die holder is obtained by "T"-shaped revolution, and lateral " u "-shaped hole is arranged in the top half of lower die holder, " u "-shaped hole bottom surface opens up the groove to match with the step of Extruding die and stretching circle, and in lower die holder side, level opens up a circle The lower half portion in hole, lower die holder opens up out rectangular through holes.
6. a kind of extrusion stretching shaping dies of high-performance magnesium-alloy thin-wall tube according to claim 1, it is characterised in that: The locating ring is matched with lower die holder, does "T"-shaped revolving body, is ridden in the positioning collar aperture of lower die holder.
CN201710548594.3A 2017-07-03 2017-07-03 A kind of extrusion stretching shaping dies of high-performance magnesium-alloy thin-wall tube CN107282678B (en)

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* Cited by examiner, † Cited by third party
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CN110052847B (en) * 2019-05-21 2020-12-01 佛山市南海万格士机械设备有限公司 Aluminum profile extrusion production line

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US3498221A (en) * 1968-07-11 1970-03-03 Harvey Aluminum Inc Aluminum cartridge case
CN101972792A (en) * 2010-10-22 2011-02-16 南京迪威尔重型锻造股份有限公司 Hot reverse-extrusion forming mold for large cup shell
CN103537500A (en) * 2013-10-24 2014-01-29 河南科技大学 Extrusion and molding method for cup-shaped part and special extrusion die
CN104084447A (en) * 2014-06-26 2014-10-08 梧州恒声电子科技有限公司 Device for producing pull tube type products by virtue of back-extrusion and stretching procedures
CN104785563A (en) * 2015-03-30 2015-07-22 北京机电研究所 Precise extruding and forming method for long barrel-shaped component with base

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3498221A (en) * 1968-07-11 1970-03-03 Harvey Aluminum Inc Aluminum cartridge case
CN101972792A (en) * 2010-10-22 2011-02-16 南京迪威尔重型锻造股份有限公司 Hot reverse-extrusion forming mold for large cup shell
CN103537500A (en) * 2013-10-24 2014-01-29 河南科技大学 Extrusion and molding method for cup-shaped part and special extrusion die
CN104084447A (en) * 2014-06-26 2014-10-08 梧州恒声电子科技有限公司 Device for producing pull tube type products by virtue of back-extrusion and stretching procedures
CN104785563A (en) * 2015-03-30 2015-07-22 北京机电研究所 Precise extruding and forming method for long barrel-shaped component with base

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