CN207746223U - Rare earth enhances magnesium-zinc alloy seamless tubular goods temperature control extrusion die - Google Patents
Rare earth enhances magnesium-zinc alloy seamless tubular goods temperature control extrusion die Download PDFInfo
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- CN207746223U CN207746223U CN201721845735.XU CN201721845735U CN207746223U CN 207746223 U CN207746223 U CN 207746223U CN 201721845735 U CN201721845735 U CN 201721845735U CN 207746223 U CN207746223 U CN 207746223U
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Abstract
The utility model discloses a kind of rare earths to enhance magnesium-zinc alloy seamless tubular goods temperature control extrusion die, including upper die holder, lower die holder, interior extrusion cylinder, outer extrusion cylinder, insulating layer and outsourcing mould, it is provided with heater strip on the inside of outer extrusion cylinder, tubing outer mould, pressure ram are installed in interior extrusion cylinder, pressure ram lower end is installed with squeezing needle, the thermometer hole of perforation is offered on the interior extrusion cylinder, outer extrusion cylinder, insulating layer and outsourcing mould, and thermocouple is installed in thermometer hole.This kind of rare earth enhancing magnesium-zinc alloy seamless tubular goods temperature control extrusion die has the advantages that not available for the prior arts such as crimp power is small, handling are more convenient, pipe scale is more accurate, product processing quality is good, acceptance rate is high.
Description
Technical field
The utility model is related to the processing technique field of kirsite seamless pipe, especially a kind of rare earth enhancing magnesium-zinc alloy without
Slit-tube material temperature control extrusion die.
Background technology
Magnesium alloy has many advantages, such as that density is low, pyroconductivity is high, damping is good, Cutting free, is counted as this century most
The engineering material for having development prospect, is applied in numerous areas such as Aeronautics and Astronautics, automobile, medical instruments.But
It is the Patterns for Close-Packed Hexagonal Crystal structure of magnesium and magnesium alloy so that in deformation process, slip system starts less, affects its modeling for it
Property deformability.Therefore, magnesium alloy as parts material or passes through die casting, one-pass molding；By forging, extruding,
The processing technologys such as rolling, improve its plasticity and intensity.In recent years, with the raising of materials processing technology and equipment, magnesium alloy
Plastic processing obtains more and more concerns.
In recent years, due to degradable and absorbent medical material research rise, magnesium alloy is effective in body fluid with it
The advantages such as degradation, the component wanted with the close elasticity modulus of people's bone, bulk composition behaviour weight, being counted as a new generation can
One of the best candidate material of degradation medical instrument.Especially for vascular interventional treatment, the characteristics of magnesium alloy degradable absorption
It can make intravascular stent prepared therefrom after the reparation for completing lesion blood vessel, voluntarily degradation disappears, and then it is long to eliminate holder
Stay risk caused by caused rejection, thrombus at a specified future date and secondary restenosis in vivo.Although magnesium alloy is intervened as blood vessel and is cured
Treating device material has inborn advantage, but its low plastic deformation ability causes to process intravascular stent magnesium alloy pipe
It processes extremely difficult.Common tubular object extruding technique includes mainly rolling and drawing, straight due to conventional vascular stents tubing
Diameter is all in 3mm hereinafter, so rolling and drawing are indispensable links in the processing of magnesium alloy precision tube.For precision tube
Processing for, the quality of pipe can all generate important influence to the final mass and performance of tubing.Currently, being directed to magnesium alloy
The processing of pipe mainly have machine chips processing and two kinds of extrusion process, in contrast, extrusion process have higher efficiency and
Stock utilization, and the length of tubing can be more in line with the requirement of rolling and drawing, but this is also to the extruding work of tubing
Skill and its mold are put forward higher requirements.Requirement due to holder tubing to performance and quality is very high, is generally used forward direction
The technique of extruding processes intravascular stent magnesium alloy pipe, to ensure obtained tubing without micro chink, non-microcracked.In forward direction
In extrusion process, tube wall thickness and shape are mainly controlled by squeezing needle and tubing epimorph, and squeezing needle and tubing shape
It is limited by extrusion cylinder between mould, if the plastic deformation ability of blank does not reach best in extrusion process, it is easy to
Lead to the inhomogeneities of extruding pipe material circumferential thickness, especially outer diameter is smaller and the relatively thin tubing of wall thickness squeezing.Wherein, mold
Precision and magnesium alloy blank temperature control precision the plastic deformation behavior of magnesium alloy pipe can all be had an impact.However, mesh
The research that the preceding pipe for medical magnesium alloy squeezes is relatively fewer, and especially the control accuracy of pipe and die change is convenient
Property etc..This results in the Wall thickness uniformity of magnesium alloy pipe and the roundness of cast poor, and then influences the tubing later stage
The processing such as drawing, rolling, and then influence the overall performance and yield rate of medical magnesium alloy precision tube.
So providing a kind of with more convenient controllable, the magnesium alloy seamless pipe processing technology of stable accuracy and its control
Temperature extension mould is significantly to improving medical magnesium alloy precision tube performance.
In short, the prior art is there are production technology complexity, product processing quality is bad, product acceptance rate is low, production is set
The standby complicated, technological deficiencies such as implementation cost is high, many disadvantages seriously limit this field develop further along with
It promotes and applies.
It is lacked in view of this, the purpose of this utility model is to provide a kind of new technical solutions with solving existing technology
It falls into.
Utility model content
For overcome the deficiencies in the prior art, the utility model provides a kind of rare earth enhancing magnesium-zinc alloy seamless tubular goods temperature control
Extrusion die solves tubing low precision, tubing matter present in prior art processing magnesium-zinc alloy seamless tubular goods production process
Measure the technological deficiencies such as difference.
Technical solution adopted by the utility model to solve its technical problems is：
A kind of rare earth enhancing magnesium-zinc alloy seamless tubular goods hot extrusion technique, processing step include：
Step 1：Homogenizing cast ingot：Rare earth enhancing magnesium-zinc alloy ingot casting is placed in heat-treatment furnace and heats and keeps the temperature
Certain time, treatment temperature are 400-520 DEG C, and soaking time is 4-10 hours；
Step 2：Preliminary extrusion process：First, the rare earth enhancing magnesium-zinc alloy ingot casting by Homogenization Treatments is passed through into machine
Tool processing method removes epidermis；Secondly, the rare earth enhancing magnesium-zinc alloy ingot casting after removal epidermis is subjected to extrusion process, it is described to squeeze
The extrusion ratio of pressure processing is 4-8, and the operating temperature of extrusion process is 350-450 DEG C；Finally, in 380-450 DEG C of temperature range
The interior rare earth enhancing magnesium-zinc alloy ingot casting to after extrusion process carries out destressing heat treatment and obtains the tiny preliminary extruding of crystal grain
Blank；
Step 3：Lubricated：It will be removed table by the preliminary extrusion billet of preliminary extruding and destressing heat treatment
Skin processing and processing endoporus processing, prepare the column blank with concentric circle holes, and further uniformly applied in column blank surface
Cover high-temperature lubricant；
Step 4：Temperature control extrusion forming：By the column blank heating by step 3 processing to 400-470 DEG C, while profit
Core extrusion mold is heated to heating device mutually synthermal with column blank, the column blank of preheating is then put into core
Extrusion die is controlled the temperature of column blank and core extrusion mold pre- by temperature control device after core extrusion mold clamping
If temperature range, during this, core extrusion mold, which squeezes column blank, to be become rare earth and enhances magnesium-zinc alloy seamless tubular goods；
Step 5：Tubing is heat-treated：Magnesium-zinc alloy seamless pipe is enhanced to the rare earth of extrusion forming under high-purity argon gas protection
Material is heat-treated, to meet the performance requirement of post-production.
As a further improvement of the above technical scheme, the temperature of temperature control extrusion forming is 420-450 in the step 4
DEG C, extruding rate 1-15mm/s, extrusion ratio 8-30.
As a further improvement of the above technical scheme, at the step 5 middle rare earth enhancing magnesium-zinc alloy seamless tubular goods heat
Managing technological parameter is：Heat treatment temperature is 380-500 DEG C, and heat treatment time is 0.2-2 hours, the cooling side used after heat treatment
Formula is air quenching.
As a further improvement of the above technical scheme, the high-temperature lubricant is that graphite powder and high temperature mineral oil press matter
Measure percentage 1:The mixture of 2-4 proportionings.
The utility model additionally provides a kind of rare earth enhancing magnesium-zinc alloy seamless tubular goods temperature control extrusion die, including upper mold
Seat, lower die holder and between upper die holder and lower die holder and the interior extrusion cylinder, outer extrusion cylinder, the insulating layer that set gradually from inside to outside
And outsourcing mould, the outer extrusion cylinder inside are provided with heater strip, the interior extrusion cylinder is a cylinder with hollow channel, interior to squeeze
Tubing outer mould is installed in the hollow channel of pressure cylinder, the tubing outer mould has an extrusion mouth, the interior extrusion cylinder it is hollow
Pressure ram is installed, the pressure ram lower end is installed with squeezing needle, and the squeezing needle may pass through the extruding in channel
Mouth simultaneously coordinates extrusion mouth to realize squeeze function, and perforation is offered on the interior extrusion cylinder, outer extrusion cylinder, insulating layer and outsourcing mould
Thermometer hole is equipped with thermocouple in the thermometer hole.
As an improvement of the above technical solution, the upper die holder and lower die holder offer respectively upper die holder squeezing through-hole and under
Die holder squeezing through-hole, the size of the upper die holder squeezing through-hole matches the size of the hollow channel of the interior extrusion cylinder, described to squeeze
The tubing of pressing and extrusion forming can be pierced by after passing through the extrusion mouth from lower die holder squeezing through-hole, on the inside of the outer extrusion cylinder
Wall is provided with the heater strip mounting groove extended spirally, and the heater strip is mounted in the heater strip mounting groove.
As a further improvement of the above technical scheme, lower die holder top is provided with a positioning frustum, the outer extrusion cylinder
Lower end is provided with the locating cone position for coordinating the positioning frustum, the outer cooperation for being pressed through positioning frustum and locating cone position
Structure realization is mutually located.
As a further improvement of the above technical scheme, the pressure ram lower end is provided with squeezing needle mounting groove, described
The upper end of squeezing needle is mounted in the squeezing needle mounting groove, and the fixed pin for fixed press needle is provided on pressure ram,
The upper die holder and lower die holder are fixedly connected by fixing bolt with outsourcing mould.
As a further improvement of the above technical scheme, the inner surface of the outer extrusion cylinder and the outer surface of interior extrusion cylinder are equal
With 5 ° of cone angle, the outer extrusion cylinder is assembled into an entirety with interior extrusion cylinder by transition cooperation.
As a further improvement of the above technical scheme, the tubing outer mould, which has to squeeze into cone position and squeeze out, bores position, institute
The cone angle for squeezing into cone position is stated less than 90 °, the cone angle for squeezing out cone position is more than 100 °.
The utility model has the beneficial effects that：The utility model provides a kind of rare earth enhancing magnesium-zinc alloy seamless tubular goods control
Temperature extension mould, the temperature control squeeze extrusion die with crimp power is small, handling are more convenient, pipe scale is more smart
The advantages that close, product processing quality is good, acceptance rate is high contributes to this field further genralrlization application.
It is closed in short, this kind of rare earth enhancing magnesium-zinc alloy seamless tubular goods temperature control extrusion die solves prior art processing magnesium zinc
The technological deficiencies such as tubing low precision present in golden seamless tubular goods production process, pipe workpiece quality difference.
Description of the drawings
The utility model is further illustrated with reference to the accompanying drawings and examples.
Fig. 1 is the assembling schematic diagram of the utility model middle rare earth enhancing magnesium-zinc alloy seamless tubular goods temperature control extrusion die；
Fig. 2 is the structural schematic diagram of tubing outer mould in the utility model；
Fig. 3 is the rare earth enhancing magnesium-zinc alloy seamless tubular goods cross section microstructure prepared in the utility model embodiment.
Specific implementation mode
The technique effect of the design of the utility model, concrete structure and generation is carried out below with reference to embodiment and attached drawing
It clearly and completely describes, to be completely understood by the purpose of this utility model, feature and effect.Obviously, described embodiment
It is a part of the embodiment of the utility model, rather than whole embodiments, it is based on the embodiments of the present invention, the skill of this field
The other embodiment that art personnel are obtained without creative efforts belongs to the model of the utility model protection
It encloses.In addition, all connection/connection relations arrived involved in patent, not singly refer to component and directly connect, and referring to can be according to specific
Performance, by adding or reducing couple auxiliary, to form more preferably coupling structure.Each skill in the utility model creation
Art feature, can be with combination of interactions, referring to Fig.1, Fig. 2, Fig. 3 under the premise of not conflicting conflict.
A kind of rare earth enhancing magnesium-zinc alloy seamless tubular goods hot extrusion technique, processing step include：
Step 1：Homogenizing cast ingot：Rare earth enhancing magnesium-zinc alloy ingot casting is placed in heat-treatment furnace and heats and keeps the temperature
Certain time, treatment temperature are 400-520 DEG C, and soaking time is 4-10 hours；
Step 2：Preliminary extrusion process：First, the rare earth enhancing magnesium-zinc alloy ingot casting by Homogenization Treatments is passed through into machine
Tool processing method removes epidermis；Secondly, the rare earth enhancing magnesium-zinc alloy ingot casting after removal epidermis is subjected to extrusion process, it is described to squeeze
The extrusion ratio of pressure processing is 4-8, and the operating temperature of extrusion process is 350-450 DEG C；Finally, in 380-450 DEG C of temperature range
The interior rare earth enhancing magnesium-zinc alloy ingot casting to after extrusion process carries out destressing heat treatment and obtains the tiny preliminary extruding of crystal grain
Blank；
Step 3：Lubricated：It will be removed table by the preliminary extrusion billet of preliminary extruding and destressing heat treatment
Skin processing and processing endoporus processing, prepare the column blank with concentric circle holes, and further uniformly applied in column blank surface
Cover high-temperature lubricant；
Step 4：Temperature control extrusion forming：By the column blank heating by step 3 processing to 400-470 DEG C, while profit
Core extrusion mold is heated to heating device mutually synthermal with column blank, the column blank of preheating is then put into core
Extrusion die is controlled the temperature of column blank and core extrusion mold pre- by temperature control device after core extrusion mold clamping
If temperature range, during this, core extrusion mold, which squeezes column blank, to be become rare earth and enhances magnesium-zinc alloy seamless tubular goods；
Step 5：Tubing is heat-treated：Magnesium-zinc alloy seamless pipe is enhanced to the rare earth of extrusion forming under high-purity argon gas protection
Material is heat-treated, to meet the performance requirement of post-production.
Preferably, the temperature of temperature control extrusion forming is 420-450 DEG C, extruding rate 1-15mm/s in the step 4,
Extrusion ratio is 8-30.
Preferably, the step 5 middle rare earth enhancing magnesium-zinc alloy seamless tubular goods heat treatment process parameter is：Heat treatment temperature
Degree is 380-500 DEG C, and heat treatment time is 0.2-2 hours, and the type of cooling used after heat treatment is air quenching.
Preferably, the high-temperature lubricant is graphite powder and high temperature mineral oil by mass percentage 1:2-4 proportionings are mixed
Close object.
The utility model also provides a kind of rare earth enhancing magnesium-zinc alloy seamless tubular goods temperature control extrusion die, including upper die holder 1,
Lower die holder 6 and between upper die holder 1 and lower die holder 6 and set gradually from inside to outside interior extrusion cylinder 10, outer extrusion cylinder 5, protect
Warm layer 4 and outsourcing mould 3,5 inside of the outer extrusion cylinder are provided with heater strip 11, and the interior extrusion cylinder 10 is one with hollow channel
Cylinder, tubing outer mould 8 is installed, the tubing outer mould 8 has extrusion mouth 80, institute in the hollow channel of interior extrusion cylinder 10
It states and pressure ram 13 is installed in the hollow channel of interior extrusion cylinder 10,13 lower end of the pressure ram is installed with squeezing needle 7, institute
Squeezing needle 7 is stated to may pass through the extrusion mouth 80 and extrusion mouth 80 is coordinated to realize squeeze function, the interior extrusion cylinder 10, outer extrusion cylinder
5, the thermometer hole of perforation is offered on insulating layer 4 and outsourcing mould 3, and thermocouple 9 is installed in the thermometer hole.
Preferably, the upper die holder 1 and lower die holder 6 offer upper die holder squeezing through-hole and lower die holder squeezing through-hole respectively,
The size of the upper die holder squeezing through-hole matches the size of the hollow channel of the interior extrusion cylinder 10, the squeezing needle 7 and extruding
Molding tubing passes through that the extrusion mouth is after 80s to be pierced by from lower die holder squeezing through-hole, 5 madial wall of the outer extrusion cylinder setting
There are the heater strip mounting groove extended spirally, the heater strip 11 to be mounted in the heater strip mounting groove.
Preferably, 6 top of lower die holder is provided with a positioning frustum 61, and 5 lower end of outer extrusion cylinder is provided with cooperation institute
The locating cone position 51 of positioning frustum 61 is stated, the outer extrusion cylinder 5 is real by positioning frustum 61 and the fit structure of locating cone position 51
It is now mutually located, the cone angle of the positioning frustum 61 is 110-140 °.
Preferably, 13 lower end of the pressure ram is provided with squeezing needle mounting groove, and the upper end of the squeezing needle 7 is mounted on
In the squeezing needle mounting groove, be provided with the fixed pin 12 for fixed press needle 7 on pressure ram 13, the upper die holder 1 and under
Die holder 6 is fixedly connected by fixing bolt 2 with outsourcing mould 3.
Preferably, the inner surface of the outer extrusion cylinder 5 and the outer surface of interior extrusion cylinder 10 all have 5 ° of cone angle, described outer
Extrusion cylinder 5 is assembled into an entirety with interior extrusion cylinder 10 by transition cooperation.
Preferably, the tubing outer mould 8, which has, squeezes into cone position 81 and squeezes out cone position 82, described to squeeze into the cone angle for boring position 81
Less than 90 °, the cone angle for squeezing out cone position 82 is more than 100 °.
The pressure ram 13 is clearance fit with interior extrusion cylinder 10, and the pressure ram 13 can be in the hollow logical of interior extrusion cylinder 10
It is moved in road.
It is 4.5-12mm that technical solution provided by the utility model, which can smoothly squeeze outer diameter, and internal diameter is the dilute of 3.5-10mm
Soil enhancing magnesium-zinc alloy seamless tubular goods, stock utilization is high, and extruding force is small, and molding is smooth, size of pipe and tubing precision is high, surface quality
It is good, excellent in mechanical performance.
When the utility model is embodied, the interior extrusion cylinder 10 and outer extrusion cylinder 5 are coordinated by the transition of closed tolerance,
The thermal expansion of material can be by further sealed limit between component during heating in this way.Designed by tube forming system
Pressure ram 13, squeezing needle 7, interior extrusion cylinder 10 and tubing outer mould 8 be all cylinder class machining molding, can be with effective guarantee
Concentricity, and improve the dimensional accuracy of tubing.It is limited using cylindrical duct between the squeezing needle 7 and pressure ram 13, on the one hand
Conducive to being integrally machined and improving limit accuracy, on the other hand it is convenient for being changed according to size of pipe and tubing replacing squeezing needle 7.Tubing outer mould
The cone angle for squeezing into cone position 81 of 8 insides and tube billet contact is less than 90 °, is conducive to the extrusion of tube billet in this way；Squeeze into cone
Position 81 and the junction of cylinder pass through arc transition, it is possible to reduce damage of the wedge angle to pipe outer surface.Tubing outer mould 8 and interior
Extrusion cylinder 13 and coordinated by closed tolerance transition, is conducive to improve tubing precision, is also convenient for replacing, 8 lower part of tubing outer mould
Squeeze out the cone angle of cone position 82（β）More than 100 °, squeezed out from 8 lower part of tubing outer mould convenient for tubing.
It is added to insulating layer 4 in 5 outside of outer extrusion cylinder, is scattered and disappeared outward by outer extrusion cylinder 5 with reducing heat, influences temperature control
Effect, while outsourcing mould 3 being avoided to overheat, it influences to squeeze construction.In order to obtain the temperature of pipe to be extruded in real time, to regulate and control to add
Heated filament is equipped with perforation to the 3mm of interior container wall 10 in the bottom of interior extrusion cylinder 10, outer extrusion cylinder 5, insulating layer 4 and outsourcing mould 3
The thermometer hole of left and right（8 top of tubing outer mould）, thermocouple 9 is housed, the thermocouple 9 can be with heater strip 11 together in thermometer hole
Form temperature control system.
Temperature control extrusion die provided by the utility model can use on common vertical hydraulic press, can in extrusion process
To set limit pressure head on pressure ram, pressure ram 13 and tubing epimorph can be prevented to be in contact.When blank in extrusion cylinder
It will squeeze when finishing, limit pressure head can contact with upper die holder 1, and triggering shutdown can save tube billet and be also prevented from this way
Mold damage.After extruding, extracts squeezing needle 7 out, cuts intact extruding tubing, be changed to extruder head, unload lower die holder 6,
Continue to squeeze, remaining tube billet and tubing outer mould 8 is made to be exited from 10 downside of interior extrusion cylinder.
The utility model is described in detail with reference to specific embodiment.
Embodiment：The present embodiment is the Mg-2.0Zn-0.6Y-0.4Nd magnesium alloys that hot extrusion outer diameter is 7mm, internal diameter is 4mm
Seamless tubular goods.
Temperature control extrusion die used in the present embodiment is referring to Fig.1.Interior extrusion cylinder 10 and outer extrusion cylinder 5 by taper fit, into
Row is limited and is fixed, and has spiral-distributed heater strip 11, the downside of inside and outside extrusion cylinder 10 to be provided with thermometer hole in outer extrusion cylinder 5, is surveyed
Thermocouple 9 and heater strip 11 constitute automatic temperature control system by external temperature regulating device in warm hole；10 internal diameter 30mm of interior extrusion cylinder, pipe
Material outer mould 8 is in direct contact by inner wall of the transition with extrusion cylinder 10 in contract, 7 diameter 4mm of squeezing needle, outside squeezing needle 7, tubing
Pattern 8 and interior extrusion cylinder 10 are located on same axis, the interior shape and size of co- controlling tubing；Outer extrusion cylinder 5 passes through lower part
It positions frustum 61 mutually to limit with lower die holder 6, interior extrusion cylinder 10 and tubing outer mould 8 are supported by lower die holder 6, outer extrusion cylinder 5
Outside is equipped with the insulating layer 4 made of glass fiber or asbestos；Limit pressure head on pressure ram 13 can ensure squeezing
Pressure ram 13 will not be in contact with tubing outer mould 8 in journey；Interior extrusion cylinder 10 and outer extrusion cylinder 5 and insulating layer 4 are through outsourcing mould 3
Then protection utilizes fixing bolt 2 and upper die holder 1 and lower die holder 6 to fix.
It uses above-mentioned temperature control extrusion die to squeeze the Mg-2.0Zn-0.6Y-0.4Nd magnesium that outer diameter is 4mm for 7mm, internal diameter to close
Golden seamless tubular goods processing step is as follows：
（1）Homogenizing cast ingot：It is the ingot casting of 120mm by the Mg-2.0Zn-0.6Y-0.4Nd magnesium alloy castings of smelting,
Homogenization Treatments are carried out in heat-treatment furnace, heating temperature is 510 DEG C, soaking time 6 hours.
（2）Preliminary extrusion process：The rare earth enhancing magnesium-zinc alloy ingot casting mechanical processing of Homogenization Treatments is removed into epidermis, with
Extrusion ratio 14 carries out extrusion process at 400 DEG C, and keep the temperature at 380 DEG C 1 hour removal machining stress, obtain crystal grain it is tiny at the beginning of
Walk extrusion billet.
（3）Lubricated：The preliminary rare earth enhancing magnesium-zinc alloy for squeezing and being heat-treated is removed into epidermis, and it is outer to process acquisition
Diameter 29mm, the column blank of the concentric circle holes of internal diameter 5mm, and high-temperature lubricant is uniformly coated on surface, lubricant is graphite powder
With high temperature mineral oil by mass percentage 1:The mixture of 3 proportionings.
（4）Temperature control extrusion forming：By blank heating to be extruded to 430 DEG C, while utilizing heating device by core extrusion mould
Tool is heated to mutually synthermal, and the extrusion billet of preheating is then put into core extrusion mold, and temperature control device is led to after molding will extruding
The temperature of blank and core extrusion mold is controlled at 420-430 DEG C, carries out extrusion forming, extruding rate 2mm/s, and extrusion ratio is
24。
（5）Move back mould：When the limit pressure head on pressure ram is contacted with upper die holder, halt switch is triggered, stops pressurization immediately,
Extract out squeezing needle, cut intact extruding tubing, be changed to extruder head, unload lower die holder, continue to squeeze, make remaining tube billet and
Tubing outer mould exits on the downside of interior extrusion cylinder.
（6）Tubing is heat-treated：Under high-purity argon gas protection to the rare earth of extrusion forming enhance magnesium-zinc alloy seamless tubular goods into
Row heat treatment, to meet the performance requirement of post-production, 400 DEG C of heat treatment temperature, heat treatment time：0.3 hour, after heat treatment
It is cooled down by the way of air quenching.
In the present embodiment extrusion process, extruder maximum extrusion pressure is no more than 250KN, squeezes and expects the 5% of insufficient blank,
The Mg-2.0Zn-0.6Y-0.4Nd magnesium alloy seamless pipes surface of acquisition is smooth, and Wall-Thickness Difference is less than 0.05mm, average grain size
About 15 μm, tensile strength 220MPa, elongation percentage 21%.After destressing heat treatment, crystal grain is slightly roughened, and intensity decreases,
Reach 210MPa, plasticity increased, and reach 25%.
It is to be illustrated to the preferable implementation of the utility model, but the utility model creation is not limited to institute above
Embodiment is stated, those skilled in the art can also make various be equal without departing from the spirit of the present invention
Deformation is replaced, these equivalent deformations or replacement are all contained in the application claim limited range.
Claims (6)
1. a kind of rare earth enhances magnesium-zinc alloy seamless tubular goods temperature control extrusion die, it is characterised in that：Including upper die holder（1）, lower die
Seat（6）And it is located at upper die holder（1）With lower die holder（6）Between and the interior extrusion cylinder that sets gradually from inside to outside（10）, outer extrusion cylinder
（5）, insulating layer（4）And outsourcing mould（3）, the outer extrusion cylinder（5）Inside is provided with heater strip（11）, the interior extrusion cylinder（10）
For a cylinder with hollow channel, interior extrusion cylinder（10）Hollow channel in tubing outer mould is installed（8）, outside the tubing
Pattern（8）With extrusion mouth（80）, the interior extrusion cylinder（10）Hollow channel in pressure ram is installed（13）, the pressure ram
（13）Lower end is installed with squeezing needle（7）, the squeezing needle（7）It may pass through the extrusion mouth（80）And coordinate extrusion mouth
（80）Realize squeeze function, the interior extrusion cylinder（10）, outer extrusion cylinder（5）, insulating layer（4）And outsourcing mould（3）On offer and pass through
Logical thermometer hole is equipped with thermocouple in the thermometer hole（9）.
2. a kind of rare earth according to claim 1 enhances magnesium-zinc alloy seamless tubular goods temperature control extrusion die, it is characterised in that：
The upper die holder（1）And lower die holder（6）Upper die holder squeezing through-hole and lower die holder squeezing through-hole are offered respectively, and the upper die holder squeezes
The size of through-hole is pressed to match the interior extrusion cylinder（10）Hollow channel size, the squeezing needle（7）And the pipe of extrusion forming
Material passes through the extrusion mouth（80）After can be pierced by from lower die holder squeezing through-hole, the outer extrusion cylinder（5）Madial wall is provided with spiral shell
Revolve the heater strip mounting groove extended, the heater strip（11）In the heater strip mounting groove.
3. a kind of rare earth according to claim 1 enhances magnesium-zinc alloy seamless tubular goods temperature control extrusion die, it is characterised in that：
Lower die holder（6）Top is provided with a positioning frustum（61）, the outer extrusion cylinder（5）Lower end is provided with the cooperation positioning frustum
（61）Locating cone position（51）, the outer extrusion cylinder（5）By positioning frustum（61）With locating cone position（51）Fit structure it is real
Now it is mutually located.
4. a kind of rare earth according to claim 1 enhances magnesium-zinc alloy seamless tubular goods temperature control extrusion die, it is characterised in that：
The pressure ram（13）Lower end is provided with squeezing needle mounting groove, the squeezing needle（7）Upper end be mounted on the squeezing needle
In mounting groove, pressure ram（13）On be provided with for fixed press needle（7）Fixed pin（12）, the upper die holder（1）And lower die
Seat（6）Pass through fixing bolt（2）With outsourcing mould（3）It is fixedly connected.
5. a kind of rare earth according to claim 1 enhances magnesium-zinc alloy seamless tubular goods temperature control extrusion die, it is characterised in that：
The outer extrusion cylinder（5）Inner surface and interior extrusion cylinder（10）Outer surface all have 5 ° of cone angle, the outer extrusion cylinder（5）With
Interior extrusion cylinder（10）It is assembled into an entirety by transition cooperation.
6. a kind of rare earth according to claim 1 enhances magnesium-zinc alloy seamless tubular goods temperature control extrusion die, it is characterised in that：
The tubing outer mould（8）Position is bored with squeezing into（81）And squeeze out cone position（82）, described to squeeze into cone position（81）Cone angle be less than
90 °, the extrusion bores position（82）Cone angle be more than 100 °.
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| CN108015116A (en) * | 2017-12-26 | 2018-05-11 | 北京大学深圳研究院 | Rare earth strengthens magnesium-zinc alloy seamless tubular goods hot extrusion technique and temperature control extrusion die |
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| CN110842046A (en) * | 2019-12-18 | 2020-02-28 | 湖南科技大学 | Method and device for preparing composite board by extrusion-rolling compounding |
| CN111974825A (en) * | 2020-08-11 | 2020-11-24 | 燕山大学 | Extrusion forming die and method for ultra-long metal thin-wall pipe |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108015116A (en) * | 2017-12-26 | 2018-05-11 | 北京大学深圳研究院 | Rare earth strengthens magnesium-zinc alloy seamless tubular goods hot extrusion technique and temperature control extrusion die |
| CN109663830A (en) * | 2019-02-01 | 2019-04-23 | 南通市荣力达铝业有限公司 | A kind of aluminium alloy extruded cylinder of modified and its manufacturing method |
| CN110102588A (en) * | 2019-05-23 | 2019-08-09 | 广东星星制冷设备有限公司 | A kind of preparation facilities revolving wing aluminum pipe and the preparation process using it |
| CN110842046A (en) * | 2019-12-18 | 2020-02-28 | 湖南科技大学 | Method and device for preparing composite board by extrusion-rolling compounding |
| CN111974825A (en) * | 2020-08-11 | 2020-11-24 | 燕山大学 | Extrusion forming die and method for ultra-long metal thin-wall pipe |
| CN111974825B (en) * | 2020-08-11 | 2021-08-27 | 燕山大学 | Extrusion forming die and method for ultra-long metal thin-wall pipe |
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