CN108704949A - A kind of magnesium alloy channel corner hot-extrusion mold and its heating device - Google Patents
A kind of magnesium alloy channel corner hot-extrusion mold and its heating device Download PDFInfo
- Publication number
- CN108704949A CN108704949A CN201810503178.6A CN201810503178A CN108704949A CN 108704949 A CN108704949 A CN 108704949A CN 201810503178 A CN201810503178 A CN 201810503178A CN 108704949 A CN108704949 A CN 108704949A
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- China
- Prior art keywords
- mold
- magnesium alloy
- channel corner
- extrusion mold
- alloy channel
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Classifications
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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
-
- 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
- B21C23/00—Extruding metal; Impact extrusion
- B21C23/001—Extruding metal; Impact extrusion to improve the material properties, e.g. lateral extrusion
-
- 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
- B21C29/00—Cooling or heating work or parts of the extrusion press; Gas treatment of work
- B21C29/04—Cooling or heating of press heads, dies or mandrels
Abstract
The invention discloses a kind of magnesium alloy channel corner hot-extrusion molds, it is characterised in that：It includes mold（3）And pressure ram（1）, specimen access is set in mold（4）, the specimen access（4）For " <" type, the specimen access（4）Channel within angle is 120 °, and outside angle is 30 °, and inside excessive circular radius is 3mm, and outer arc radius is 3mm.
Description
Technical field
The present invention relates to the hot-pressed technology of magnesium alloy, specially a kind of magnesium alloy equal channel angular is hot extruded into pattern
Tool is used for magnesium alloy hot extrusion manufacture field.
Background technology
Magnesium is one of the light metal alloy that reserves are most abundant on the earth, and specific strength, specific stiffness are high；Heat conduction, electric conductivity
It is good；With good damping and amortization, damping property, machinability and capability of electromagnetic shielding；Processing cost is low, is easily recycled, and is praised
For the green engineering material that 21 century is most promising.Magnesium and its alloy are because with good damping performance, heat conductivility
And it is widely used in aerospace and other field of traffic etc..But since magnesium has close-packed hexagonal（HCP）Crystal structure,
Slip system is few, compared with the other structural materials such as aluminium, steel, it is poor there are plasticity the shortcomings of, constrain magnesium and its alloy industrially
Application.Therefore, research improves the mechanical properties such as the plasticity of magnesium alloy and has a very important significance.
Super fine crystal material（Including nano material and submicron material）There are many good physics, chemistry and mechanical property,
So being plastically deformed using depth（SPD , severe plastic deformation）Method becomes to obtain ultra-fine grain
The concern and research of numerous material scholars, this, which is primarily due to ultrafine grain metal material, not to lose the plasticity for even improving material
With the room temperature intensity that material is increased substantially while toughness, so as to improve the comprehensive performance of material.Equal-channel Angular Pressing is made
For a kind of large plastometric set mode, Equal-channel Angular Pressing can make material obtain big strain thus by bulk coarse grained metal or conjunction
Gold is refined into the material with ultra-fine grained structure.Block sample sample is got under the action of pressure ram from a channel, is being turned
The pure shear shear deformation of approximate ideal occurs for material at angle, is then squeezed out from another channel, and block tries cross sectional shape and sample
Sill is identical before deformation.Therefore, larger dependent variable can be obtained by the way that crimp is repeated several times, is formed in material internal
The sub-micron even ultrafine-grained (UFG) microstructure of nano-grade size.Influence magnesium alloy processing performance includes mainly mould structure, extrusion path
Diameter, contact conditions, squeezes the technological parameters such as temperature at extrusion speed.Moreover, the original microstructure of material, phase composition before deformation
Deng to material after extruding microstructure and mechanical property also have important influence.
Currently, the blank of plastic deformation is also concentrated mainly on AZ series easy-deforming magnesium alloys, the high, plasticity for thermal stability
The magnesium-rare earth plastic deformation research of deformation energy force difference is also seldom, and the magnesium-rare earth Equal-channel Angular Pressing country not yet appears in the newspapers
Road.
Invention content
The technical problem to be solved by the present invention is to：For existing equal channel angular extrusion die in structure and mold heating
It is insufficient existing for mode, it the purpose of the present invention is optimization mould structure, solves the problems, such as that traditional moulds mode of heating exists, solves
Due to the non-uniform problem of plastic deformation caused by mould structure, service life and the security performance of mold are improved, solves traditional moulds
Mode of heating there are the problem of.
The technical scheme is that：A kind of magnesium alloy channel corner hot-extrusion mold comprising mold and pressure ram,
Specimen access is set in mold, and the specimen access is " <" type, the specimen access channel within angle is 120 °, outside
Side angle is 30 °, and inside excessive circular radius is 3mm, and outer arc radius is 3mm, and channel diameter is 12mm.
Coating ceramic heating collar on the outside of the mold, and connected by attachment screw.
The mold side opens up warm hole, built-in thermocouple.
The mold further includes pedestal and locating shaft, and pedestal upper end offers mold mounting hole, with specific lower end
Pedestal fixes Block- matching, and pedestal lower end opens up the location hole to match with locating shaft.
The mold is cylinder, and two semi-cylindricals diametrically splitted by two form, above-mentioned two
Semi-cylindrical mold is spirally connected by the screw hole of locking to match.
The ceramic heat circle includes that inside is equipped with heating collar, intermediate insulating layer and the outside of being equipped with equipped with shell.
The thermocouple, ceramic heat circle connect composition heating and temperature control system with temperature controller respectively.
Beneficial effects of the present invention：
The screw hole of bolt uses layout of the counter sink bolt on mold, by the way of interconnection, forms a bolt lock
Tight train of mechanism so that two half modules are tightened to an entirety.Bolt used is M12.
Locating shaft plays position-limiting action well in the horizontal direction by the cooperation with experiment machine platform, ensures
Security performance of mold during extrusion experiment.
Surface smoothness Ra≤0.4 of die channel mould cavity plate die cavity reduces during extrusion experiment, sample and cavity plate
Frictional force between die wall.
Pedestal and extrusion die（Mold）Cooperation, fit system is tight fit.
Interior angle of cut Φ=120 ° of two half module vertical channels and access ramp are set, the mainly plasticity such as such as magnesium alloy become
The material of shape energy force difference, deflection hour avoid the surface of sample from cracking so that and sample cannot be squeezed out successfully, in addition, compared with
Φ=90 °, the extruding force needed for Φ=120 ° is small, reduces the abrasion of mold, improves the service life of mold；
As 20 ° of the outer angle of cut ψ < of mold, extruded sample cannot in channel proper flow, it is more difficult to generated in mold intersection
Deform " dead zone ", it is contemplated that extruded sample can in channel proper flow, avoid deformation " dead zone " formation, set two channels
Outer angle of cut ψ=30 °；
In view of when mold inside lock radius r is too small, being reduced to the refining efficiency of material grains, but working as inside lock radius r>
When 3mm, while influencing crimp uniformity, it can also aggravate the abrasion of mold, reduce the service life of mold.
Using inventive die can smooth extrusion magnesium alloy stick, production cost is low, and blank deformation is uniform, surface quality compared with
It is good；
Mold heating is convenient, safe, and can dynamically control temperature, and the temperature difference of mold ensures that blank is located always in ± 2 DEG C
In Isothermal Extrusion state, accuracy is higher；
Mould structure is simple, easy to use, of low cost, and service life is long.
Description of the drawings
Fig. 1 is equal channel angular hot extrusion（ECAP）Mold structure diagram；
Fig. 2 is extrusion rod structure schematic diagram used in extruded bars；
Fig. 3 is the sectional view of mold；
Fig. 4 is the front view of locating shaft；
Fig. 5 is the vertical view of locating shaft；
Fig. 6 is the metallograph for squeezing front and back magnesium alloy；A is the metallograph of sample before squeezing, and B is to squeeze primary metallograph, and C is
4 metallographs are squeezed, D is the metallograph for squeezing 6 times；
Fig. 7 is the SEM figures of the magnesium alloy sample after squeezing 1 time and 4 times；
In figure：1- pressure rams, 2- attachment screws, 3- molds, 4- specimen accesses, 5- pedestals, 6- locating shafts, 7- ceramic heats
Circle, 8- thermocouples.
Specific implementation mode
Technical solution of the present invention is described in detail with reference to specific embodiment：
A kind of magnesium alloy channel corner hot-extrusion mold comprising specimen access is arranged in mold in mold 3 and pressure ram 1
4, the specimen access 4 is " <" type, the 4 channel within angle of specimen access is 120 °, and outside angle is 30 °, inside mistake
It is 3mm to spend arc radius, and outer arc radius is 3mm, and channel diameter is 12mm；The 3 outside cladding of mold
Ceramic heat circle 7, and connected by attachment screw 2；3 side of mold opens up warm hole, built-in thermocouple 8；Described
Mold further includes pedestal 5 and locating shaft 6, and 5 upper end of pedestal offers mold mounting hole, the pedestal fixed block with specific 3 lower end
Matching, 5 lower end of pedestal opens up the location hole to match with locating shaft 6；The mold 3 is cylinder, by two along straight
Two semi-cylindricals composition that diameter is splitted, above-mentioned two semi-cylindrical molds are spirally connected by the screw hole of locking to match；Institute
It includes that inside is equipped with heating collar, intermediate insulating layer and the outside of being equipped with equipped with shell to state ceramic heat circle 7；The thermocouple 8, ceramics
Heating collar 7 connect composition heating and temperature control system with temperature controller respectively.
The present embodiment extruded length is the magnesium alloy bar of 100mm, a diameter of 12mm.
The present embodiment mould therefor structure is as indicated, a diameter of 12mm of pressure ram, a diameter of 12mm of concave die cavity, mold squeeze
It is as follows to press through journey：
（1）Using machining by magnesium alloy blank vehicle at a diameter of 12mm magnesium alloy bars, the clast of polishing magnesium alloy bar outer surface
And burr, and in pressure ram and magnesium alloy bar even application lubricant；By concave die cavity inner wall cleaning, totally rear even application moistens
Lubrication prescription；
（2）Two semi-cylindricals that mold 3 is diametrically splitted by two form, and point are partly the first mold, the second mold, by the
One mold, the second mold are fastened by bolts, and pedestal, pedestal fixed block are assembled integrally, then by the first mold, the second mould
Have pedestal, pedestal and locating shaft assembling, by ceramic heat snare outside extrusion die, ceramic heat circle by sheetmetal fix inside by
Ceramic heat circle and heat-preservation cotton composition, and fastened by screw, thermocouple is inserted into thermometric pore pressure；
（3）Mold is placed on experiment machine worktable, magnesium alloy bar is placed in mold and is heated with mold, to ensure the efficiency of heating surface
With ensure that blank is in Isothermal Extrusion state, dispose a heat-preservation cotton, setting temperature control box temperature ginseng in thermometer hole and cavity plate end
Number and mode of heating.Set testing machine parameter.After reaching established temperature, after keeping the temperature 10 min, starts testing machine and starts to test,
Until off-test.Pressure ram applies a force to magnesium alloy bar in the effect of testing machine, and magnesium alloy bar stress passes through mold 3
It after the plastic deformation of corner, is then flowed out from mold 3, is shaped to magnesium alloy bar, mold is dismantled in off-test, is taken out
Sample clears up mold for future use.
Extruding force is smaller in the present embodiment extrusion process, and maximum extrusion pressure only has 30KN.The magnesium alloy bar surface light of acquisition
It is sliding, it is smaller to squeeze front and back sectional dimension variation.Therefore, multi-pass repeatability extruding can be carried out.
After can be, it is evident that being squeezed by apparatus of the present invention from Fig. 6 and 7, the goldc grains of alloy obviously becomes
It is small, and specimen surface is also more smooth, and tissue is finer and smoother.
Claims (7)
1. a kind of magnesium alloy channel corner hot-extrusion mold, it is characterised in that：It includes mold（3）And pressure ram（1）, mold
Specimen access is set in body（4）, the specimen access（4）For " <" type, the specimen access（4）Channel within angle is
120 °, outside angle is 30 °, and inside excessive circular radius is 3mm, and outer arc radius is 3mm.
2. a kind of magnesium alloy channel corner hot-extrusion mold according to claim 1, it is characterised in that：The mold
（3）Outside coating ceramic heating collar（7）, and pass through attachment screw（2）Connection.
3. a kind of magnesium alloy channel corner hot-extrusion mold according to claim 1 or 2, it is characterised in that：The mould
Specifically（3）Side opens up warm hole, built-in thermocouple（8）.
4. a kind of magnesium alloy channel corner hot-extrusion mold according to claim 1, it is characterised in that：The mold is also
Including pedestal（5）And locating shaft（6）, pedestal（5）Upper end offers mold mounting hole, and specific（3）The pedestal of lower end is fixed
Block- matching, pedestal（5）Lower end opens up and locating shaft（6）The location hole to match.
5. a kind of magnesium alloy channel corner hot-extrusion mold according to claim 1, it is characterised in that：The mold
（3）For cylinder, two semi-cylindricals diametrically splitted by two form, and above-mentioned two semi-cylindrical molds pass through
The screw hole of locking to match is spirally connected.
6. a kind of magnesium alloy channel corner hot-extrusion mold according to claim 1, it is characterised in that：The ceramic heat
Circle（7）Heating collar, intermediate insulating layer and the outside of being equipped with are equipped with equipped with shell including inside.
7. a kind of magnesium alloy channel corner hot-extrusion mold according to claim 3, it is characterised in that：The thermocouple
（8）, ceramic heat circle（7）Composition heating and temperature control system are connect with temperature controller respectively.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810503178.6A CN108704949A (en) | 2018-05-23 | 2018-05-23 | A kind of magnesium alloy channel corner hot-extrusion mold and its heating device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810503178.6A CN108704949A (en) | 2018-05-23 | 2018-05-23 | A kind of magnesium alloy channel corner hot-extrusion mold and its heating device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN108704949A true CN108704949A (en) | 2018-10-26 |
Family
ID=63869423
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810503178.6A Pending CN108704949A (en) | 2018-05-23 | 2018-05-23 | A kind of magnesium alloy channel corner hot-extrusion mold and its heating device |
Country Status (1)
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| CN (1) | CN108704949A (en) |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108913970A (en) * | 2018-09-20 | 2018-11-30 | 贵州大学 | A kind of WE43 magnesium alloy and preparation method thereof |
| CN109136703A (en) * | 2018-09-20 | 2019-01-04 | 贵州大学 | A kind of ZK60 magnesium alloy and preparation method thereof |
| CN109261736A (en) * | 2018-09-20 | 2019-01-25 | 贵州大学 | A kind of AZ31 magnesium alloy and preparation method thereof |
| CN110052505A (en) * | 2019-05-31 | 2019-07-26 | 陕西理工大学 | A kind of experiment of magnesium alloy with etc. channel angular extrusions mold |
| CN110576071A (en) * | 2019-10-25 | 2019-12-17 | 重庆理工大学 | Forming die for preparing superfine crystal magnesium alloy |
| CN113399487A (en) * | 2021-03-10 | 2021-09-17 | 沈阳航空航天大学 | Extrusion die capable of heating 120-degree corner for magnesium alloy and aluminum alloy |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108913970A (en) * | 2018-09-20 | 2018-11-30 | 贵州大学 | A kind of WE43 magnesium alloy and preparation method thereof |
| CN109136703A (en) * | 2018-09-20 | 2019-01-04 | 贵州大学 | A kind of ZK60 magnesium alloy and preparation method thereof |
| CN109261736A (en) * | 2018-09-20 | 2019-01-25 | 贵州大学 | A kind of AZ31 magnesium alloy and preparation method thereof |
| CN110052505A (en) * | 2019-05-31 | 2019-07-26 | 陕西理工大学 | A kind of experiment of magnesium alloy with etc. channel angular extrusions mold |
| CN110576071A (en) * | 2019-10-25 | 2019-12-17 | 重庆理工大学 | Forming die for preparing superfine crystal magnesium alloy |
| CN113399487A (en) * | 2021-03-10 | 2021-09-17 | 沈阳航空航天大学 | Extrusion die capable of heating 120-degree corner for magnesium alloy and aluminum alloy |
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