CN109772922A - A kind of crowded upsetting mold squeezes upsetting processing method and magnesium alloy center collet - Google Patents
A kind of crowded upsetting mold squeezes upsetting processing method and magnesium alloy center collet Download PDFInfo
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- CN109772922A CN109772922A CN201910185875.6A CN201910185875A CN109772922A CN 109772922 A CN109772922 A CN 109772922A CN 201910185875 A CN201910185875 A CN 201910185875A CN 109772922 A CN109772922 A CN 109772922A
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Abstract
The invention discloses a kind of crowded upsetting mold, upsetting processing method and magnesium alloy center collet are squeezed, is related to plastic forming technology field.This squeezes upsetting mold and is suitable for big specification, the bar industrialized production of high-strength modeling.In extrusion process, which plays two refinement crystal grain processes of conventional extrusion and jumping-up.The former realizes that the latter is that the lower specimen finish of reverse extrusion power played the role of by the precast body being pre-placed is realized from the small upsetting process for becoming required size by becoming smaller for mold inner-cavity internal diameter.The bar of big specification, high-strength modeling can be prepared by squeezing upsetting mold by this, be suitable for the industries such as rail traffic, automobile, sports apparatus, numerically-controlled machine tool.The magnesium alloy center collet is processed to obtain by above-mentioned crowded upsetting processing method.The magnesium alloy center collet has the characteristics such as low-density, excellent vibration and noise reducing, fast cutting speed and high cutting precision, while differential arc oxidation and electrophoretic surface processing can guarantee its service life.
Description
Technical field
The present invention relates to plastic forming technology fields, and in particular to a kind of crowded upsetting mold, crowded upsetting processing method and magnesium close
Golden center collet.
Background technique
Grained material is a kind of high performance material for having both excellent in strength Yu good plasticity and toughness.People often pass through extruding, roll
The conventional plastic deformation mode such as system and forging and stamping prepares bar, profile, plate of superior performance etc..But pass through conventional extruding
Technique prepares large scale rod bar, and due to being limited to the size of extrusion equipment specification and high-quality slab, extrusion ratio is relatively small,
The dynamic recrystallization phenomenon occurred in extrusion process is insufficient, there are still coarse deformed grains that are more, being elongated in tissue, with
Part occurs the tiny equiax crystal that dynamic recrystallization is formed and forms duplex grain structure, causes bar intensity and plasticity still limited, limits
Its application field.For this purpose, people further refine crystal grain frequently with severe Plastic Deformation Methods, strive for obtaining completely tiny etc.
Axialite tissue, so that the grained material of big specification, high-strength modeling is prepared, wherein squeezing upsetting method is effective large plastometric set method
One of.
The patent of invention of Publication No. CN105033141B entitled " reciprocal crowded gathering apparatus and its application method and application "
Application discloses a kind of reciprocal crowded gathering apparatus for preparing Ultra-fine Grained pie material, and wherein cavity plate necking down area uses arc transition, energy
It effectively avoids flowing slow and non-uniform extruding dead zone in conventional extrusion, Strain Distribution is uniform, and grain dispersion is small.
Entitled " the method for continuously preparing particle enhanced aluminum-based composite material using crowded upsetting of Publication No. CN101444802B
And device " application for a patent for invention, disclose a kind of crowded gathering apparatus, can be realized on single-cylinder pressure machine obtain large deformation condition
It is lower to prepare particle reinforced aluminium-based and particle reinforced aluminum alloy based composites continuous preparations, thus obtain uniform equiax crystal and
Isotropic fine grain composite material section bar.
Although the crowded gathering apparatus of foregoing invention patent disclosure obtains the effect for playing jumping-up, crystal grain is refined to a certain extent
With improve performance, but there is some common problems: 1) above-mentioned crowded gathering apparatus can only be assigned in carrying out on hydraulic press, the material of preparation
Limited length is limited to laboratory use.2) specimen finish before and after crowded upsetting is constant.In order to obtain good effect, it may be necessary to
The reciprocal of multi-pass squeezes upsetting process, this causes entire operation process relative complex, and time-consuming.3) above-mentioned crowded upsetting equipment cannot be with work
The extruder that industry metaplasia produces combines, and is unsuitable for the industrialization continuous production of big specification, high-strength modeling bar.
In addition, machining center collet generallys use copper alloy on numerically-controlled machine tool at present, noise is greatly in work and vibration is big, shadow
Ring machining accuracy, the serious update and industrial upgrading for restricting the sector product.In all structural materials, magnesium alloy has
Excellent damping capacity and low-density, using high-damping, high-strength modeling magnesium alloy substitute above-mentioned material, can not only vibration and noise reducing, mention
High manufacturing accuracy can also significantly mitigate weight.Through inquiring, the domestic related patents without magnesium alloy machining center collet.
Summary of the invention
One of the objects of the present invention is to provide a kind of crowded upsetting molds, this squeezes the stick that upsetting mold is suitable for big specification, high-strength modeling
Material industrialized production.In extrusion process, which plays two refinement crystal grain processes of conventional extrusion and jumping-up.The former passes through
Mold inner-cavity internal diameter becomes smaller to realize, the latter is the lower sample of reverse extrusion power played the role of by the precast body being pre-placed
Diameter is realized from the small upsetting process for becoming required size.The bar of big specification, high-strength modeling can be prepared by squeezing upsetting mold by this,
Suitable for industries such as rail traffic, automobile, sports apparatus, numerically-controlled machine tools.
The second object of the present invention is to provide a kind of crowded upsetting processing method, and the extrusion bar that this method squeezes has
Big specification, the beneficial effect of high-strength modeling.
The third object of the present invention is to provide a kind of magnesium alloy center collet, which passes through above-mentioned crowded upsetting processing side
Method processes to obtain.The magnesium alloy center collet has low-density, excellent vibration and noise reducing, fast cutting speed and high cutting precision etc. special
Property, while corrosion resistance is increased substantially after differential arc oxidation and electrophoretic surface processing.
The present invention solves its technical problem and adopts the following technical solutions to realize.
The present invention proposes a kind of crowded upsetting mold, for cooperate precast body carry out squeeze upsetting processing operation to produce extrusion bar,
Comprising:
Outer dummy block, intermediate dummy block and extrusion prod cast, three is provided with inner cavity, when three is sequentially connected, three
The inner cavity of person is sequentially communicated；
The intracavity diameter of outer dummy block should be not less than the outer diameter of extrusion bar；
Intermediate dummy block and extrusion prod cast are for being arranged precast body, and the shape of precast body and intermediate dummy block and extrusion
The cavity shape of prod cast is identical；
Wherein, the internal diameter of the left end of intermediate dummy block is less than the outer diameter of extrusion bar, the internal diameter of the right end of intermediate dummy block
It is gradually increased to more than the outer diameter of extrusion bar；Squeeze out the left end inner end diameter of prod cast and the right end inner end diameter of intermediate dummy block
It is identical, and the internal diameter for squeezing out the left end of prod cast is gradually decrease to the outer diameter of extrusion bar, the internal diameter for squeezing out the right end of prod cast is greater than
The outer diameter of extrusion bar.
The present invention also proposes a kind of crowded upsetting processing method, comprising:
The type of intermediate dummy block and extrusion prod cast that precast body is put into above-mentioned crowded upsetting mold is intracavitary, and is close to intermediate squeeze
Pressure pad and the inner wall setting for squeezing out prod cast；
Slab to be extruded is squeezed by squeezing upsetting mold.
The present invention also provides a kind of magnesium alloy center collets, comprising:
Magnesium alloy is processed to obtain extruded bar from magnesium alloy by above-mentioned crowded upsetting processing method；
Extruded bar from magnesium alloy is machined at required dimensions, then carry out differential arc oxidation and electrophoretic surface is compound
Magnesium alloy center collet is obtained after processing.
The beneficial effect of the crowded upsetting mold of the embodiment of the present invention, the processing method for squeezing upsetting mold and magnesium alloy center collet
It is:
The crowded upsetting mold that the embodiment of the present invention provides is suitable for big specification, the bar industrialized production of high-strength modeling.It is squeezing
In the process, which plays two refinement crystal grain processes of conventional extrusion and jumping-up.The former is become smaller by mold inner-cavity internal diameter
It realizes, the latter is that the lower specimen finish of reverse extrusion power played the role of by the precast body being pre-placed becomes required ruler from small
Very little upsetting process is realized.The bar of big specification, high-strength modeling can be prepared by squeezing upsetting mold by this, be suitable for rail traffic, vapour
The industries such as vehicle, sports apparatus, numerically-controlled machine tool.
The embodiment of the present invention provide crowded upsetting processing method, the extrusion bar that this method squeezes have big specification,
The beneficial effect of high-strength modeling.
The excessively above-mentioned crowded upsetting processing method of the magnesium alloy center collet that the embodiment of the present invention provides processes to obtain.Squeeze upsetting mould
Tool plays two refinement crystal grain processes of conventional extrusion and jumping-up.The former is realized by becoming smaller for mold inner-cavity internal diameter, the latter
It is that the reverse extrusion power played the role of by the precast body being pre-placed descends specimen finish from the small jumping-up mistake for becoming required size
Cheng Shixian.By this squeeze upsetting mold can prepare big specification, high-damping, high-strength modeling bar, then through differential arc oxidation and electrophoresis table
Corrosion resistance is increased substantially after surface treatment.Magnesium alloy machining center collet disclosed by the invention is suitable for the row such as numerically-controlled machine tool
Industry.
Detailed description of the invention
In order to illustrate the technical solution of the embodiments of the present invention more clearly, below will be to needed in the embodiment attached
Figure is briefly described, it should be understood that the following drawings illustrates only certain embodiments of the present invention, therefore is not construed as pair
The restriction of range for those of ordinary skill in the art without creative efforts, can also be according to this
A little attached drawings obtain other relevant attached drawings.
Fig. 1 is the structural schematic diagram that the embodiment of the present invention squeezes upsetting mold；
Fig. 2 is the structural schematic diagram of precast body of the embodiment of the present invention；
Fig. 3 is the flow diagram that the embodiment of the present invention squeezes upsetting processing method；
Fig. 4 is the microstructure for bar of the AZ31B magnesium alloy through crowded upsetting mold preparation that the embodiment of the present invention provides；
Fig. 5 is the microstructure for the bar that AZ31B magnesium alloy in the prior art is prepared through common extrusion die.
Icon: 100- squeezes upsetting mold；101- precast body；The outer dummy block of 103-；Dummy block among 105-；107- squeezes out cone
Mould；109- fixing piece；The first positioning pin of 111-；The second positioning pin of 113-；115- slab.
Specific embodiment
It in order to make the object, technical scheme and advantages of the embodiment of the invention clearer, below will be in the embodiment of the present invention
Technical solution be clearly and completely described.The person that is not specified actual conditions in embodiment, according to normal conditions or manufacturer builds
The condition of view carries out.Reagents or instruments used without specified manufacturer is the conventional production that can be obtained by commercially available purchase
Product.
Crowded upsetting processing method to the crowded upsetting mold 100 of the embodiment of the present invention, crowded upsetting mold 100 and magnesium alloy center below
Collet is specifically described.
Fig. 1 and Fig. 2 are please referred to, the embodiment provides a kind of crowded upsetting molds 100, for cooperating precast body 101
Upsetting processing operation squeeze to produce extrusion bar comprising:
Outer dummy block 103, intermediate dummy block 105 and squeeze out prod cast 107, three is provided with inner cavity, when three successively
When connection, the inner cavity of three is sequentially communicated；
The intracavity diameter of outer dummy block 103 should be not less than the outer diameter of extrusion bar；
Intermediate dummy block 105 and extrusion prod cast 107 are for being arranged precast body 101, and the shape of precast body 101 and centre are squeezed
Pressure pad 105 and the cavity shape for squeezing out prod cast 107 are identical；
Wherein, the internal diameter of the left end of intermediate dummy block 105 is less than the outer diameter of extrusion bar, the right end of intermediate dummy block 105
Internal diameter be gradually increased to more than the outer diameter of extrusion bar；Squeeze out the left end inner end diameter and centre dummy block 105 of prod cast 107
Right end inner end diameter is identical, and the internal diameter for squeezing out the left end of prod cast 107 is gradually decrease to the outer diameter of extrusion bar, squeezes out prod cast
The internal diameter of 107 right end is greater than the outer diameter of extrusion bar.
In detail, in the present embodiment, this squeezes upsetting mold 100 suitable for big specification, the bar industrialized production of high-strength modeling.?
In extrusion process, which plays two refinement crystal grain processes of conventional extrusion and jumping-up.The former passes through mold inner-cavity internal diameter
Become smaller to realize, the latter is that the reverse extrusion power played the role of by the precast body 101 being pre-placed descends specimen finish by small change
It is realized for the upsetting process of required size.The bar of big specification, high-strength modeling can be prepared by squeezing upsetting mold by this, be suitable for track
The industries such as traffic, automobile, sports apparatus, numerically-controlled machine tool.
Further, in the preferred embodiment, the left end for squeezing out prod cast 107 is tapered, and conical section inclines
Gradient is in 1~10 °.Precast body 101 can be effectively acted on by the setting of gradient, so as to be effectively reversed extruding slab
115.Certainly, in other embodiments of the invention, the selective value of gradient can also be selected according to demand, of the invention
Embodiment is without limitation.
Further, in the preferred embodiment, squeezing upsetting mold 100 further includes fixing piece 109, fixing piece 109
For being fixedly connected with outer dummy block 103, intermediate dummy block 105 and squeezing out prod cast 107.Fixing piece 109 may be selected to be fixed spiral shell
Bolt, fixing bolt can be extended along the direction of bar extruding.By the setting of fixing bolt, so that squeezing the strong of upsetting mold 100
Degree and stability are effectively improved, to guarantee being normally carried out for every operation.
Further, in the preferred embodiment, outer dummy block 103, intermediate dummy block 105 and extrusion prod cast
Through-hole is provided in 107, when three's connection, the through-hole of three, which is interconnected, forms location hole, and squeezing upsetting mold 100 further includes using
In the first positioning pin 111 cooperated with location hole, the first positioning pin 111 is extended along bar extruding direction in outer dummy block
103, it intermediate dummy block 105 and squeezes out in prod cast 107.By the setting of the first positioning pin 111, so that the connection of each cavity is more
Closely, so that the progress of squeeze job is more smooth.
Further, in the preferred embodiment, squeezing upsetting mold 100 further includes the second positioning pin 113, and second is fixed
Position pin 113, which is set to, to be squeezed out in prod cast 107, and vertical with the first positioning pin 111.By the setting of the second positioning pin 113, can incite somebody to action
The suitable position that upsetting mold 100 is placed in outer ring extruded sleeve is squeezed, to add an extruded sleeve again because squeezing the outer ring of upsetting mold 100, connect
It is just whole be placed on extruder, the positioning that both the second positioning pin 113 can be used for.
It please refers to Fig.1 to Fig.3, the embodiment provides a kind of crowded upsetting processing method of crowded upsetting mold 100, packets
It includes:
The type of intermediate dummy block 105 and extrusion prod cast 107 that precast body 101 is put into above-mentioned crowded upsetting mold 100 is intracavitary,
And it is close to intermediate dummy block 105 and squeezes out the inner wall setting of prod cast 107；
Slab 115 to be extruded is squeezed by squeezing upsetting mold 100.
The extrusion bar that this method squeezes has big specification, the beneficial effect of high-strength modeling.In conjunction with conventional extruder
The industrialization continuous production of big specification, high-strength modeling bar can be realized by once squeezing.Suitable material includes pure metal, closes
Gold, intermetallic compound, composite material etc..
Further, in the preferred embodiment, slab 115 to be extruded is carried out by squeezing upsetting mold 100
The step of extruding, specifically includes:
Crowded upsetting mold 100 is placed in homogenization furnace, and keeps the temperature the first preset time under the first preset temperature；
Slab 115 and extrusion cylinder are kept the temperature into the second preset time under the second preset temperature；
Crowded upsetting mold 100 after preheating is placed on extruder, and slab 115 is put into extrusion cylinder, starts to squeeze.
Further, in the preferred embodiment, the first preset temperature is 380~450 DEG C, the second preset temperature
It is 350~430 DEG C, the first preset time and the second preset time are 1~2h.Certainly, in other embodiments of the invention,
Specific parameter selection can also be selected according to demand, and the embodiment of the present invention is without limitation.
Fig. 1 to Fig. 5 is please referred to, the embodiments of the present invention also provide a kind of magnesium alloy center collets, comprising:
Magnesium alloy is processed to obtain extruded bar from magnesium alloy by the crowded upsetting processing method of above-mentioned crowded upsetting mold 100；
Extruded bar from magnesium alloy is machined at required dimensions, then carry out differential arc oxidation and electrophoretic surface is compound
Magnesium alloy center collet is obtained after processing.
In detail, the excessively above-mentioned crowded upsetting processing method of the magnesium alloy center collet processes to obtain.It squeezes upsetting mold and plays routine
Squeeze two refinement crystal grain processes with jumping-up.The former realizes that the latter is by preparatory by becoming smaller for mold inner-cavity internal diameter
The lower specimen finish of the reverse extrusion power that the precast body 101 of placement plays the role of is realized from the small upsetting process for becoming required size.
By this squeeze upsetting mold can prepare big specification, high-damping, high-strength modeling bar, then through differential arc oxidation and electrophoretic surface processing after
Increase substantially corrosion resistance.Magnesium alloy machining center collet disclosed by the invention is suitable for the industries such as numerically-controlled machine tool.
Further, in the preferred embodiment, magnesium alloy includes AZ31B magnesium alloy or ZK60 magnesium alloy.When
So, in other embodiments of the invention, magnesium alloy can also be other novel wrought magnesium alloys, and the embodiment of the present invention is not done
It limits.
Feature and performance of the invention are described in further detail with reference to embodiments.
Embodiment 1
A kind of crowded upsetting processing method of magnesium alloy rod is present embodiments provided, the material that this method uses is semicontinuous casting
Make the AZ31B magnesium alloy slab 115 of the diameter 100mm of preparation.Through analyzing, the 115 section ingredient segregation-free of slab, microstructure
Unanimously.
In detail, method includes the following steps:
Firstly, the precast body 101 of one AZ31B magnesium alloy material of machining, gradient is 3 °, point diameter 15mm, after
End diameter is 35mm.Then, precast body 101 is closely placed in intermediate dummy block 105 and squeezed out in 107 inner cavity of prod cast, together with outer
Dummy block 103 is combined into the crowded upsetting mold 100 of complete set.Then, whole set of die 100 and slab 115 are placed in homogenization
In furnace, respectively in 400 DEG C and 360 DEG C heat preservation 2h, guarantee mold 100 and 115 heat penetration of slab；The extrusion cylinder heating of extruder simultaneously
To 400 DEG C.Then, preheated whole set of die 100 is packed on extruder, slab 115 is put into extrusion cylinder, carries out extruding examination
It tests, extrusion speed 0.3mm/s.Finally, it is good for 35mm, surface quality to prepare diameter through crowded upsetting mold 100 of the invention
Bar.
Complete dynamic recrystallization has occurred in the bar prepared through crowded upsetting mold 100 of the invention, and microstructure is complete
Tiny equiax crystal, only 1.7 μm of average grain size, room temperature tensile intensity and elongation are respectively 282MPa and 26.0%, special
It is not elongation compared with (bar of the conventional extrusion) elongation of comparative example 1 raising 93%.
Comparative example 1
The material that this comparative example uses is still for the AZ31B magnesium alloy slab 115 of the diameter 100mm of semi-continuous casting preparation.
Through analyzing, the 115 section ingredient segregation-free of slab, microstructure is consistent.
As a comparison case, the conventional extrusion mould specification used is directly squeezes out diameter from 115 diameter 100mm of slab
The bar of 35mm, while being not required to place precast body 101.Firstly, mold and slab 115 are placed in homogenization furnace, exist respectively
400 DEG C and 360 DEG C heat preservation 2h guarantee mold and 115 heat penetration of slab；The extrusion cylinder of extruder is warming up to 400 DEG C simultaneously.Then,
Preheated mold is packed on extruder, slab 115 is put into extrusion cylinder, carries out squeeze test, extrusion speed 0.3mm/
s.Finally, equally preparing diameter through conventional extrusion die is 35mm, the good bar of surface quality.
Complete dynamic recrystallization does not occur for the bar prepared through conventional extrusion die, and microstructure is tied again by dynamic occurs
The tiny equiax crystal and the coarse deformed grains composition being elongated, average grain size that crystalline substance is formed are 7.9 μm, room temperature tensile intensity
It is respectively 278MPa and 13.5% with elongation.
It can be obtained from above-described embodiment 1 and 1 Comparative result of comparative example, the bar prepared through crowded upsetting mold of the invention has
The features such as complete tiny equiaxed grain structure, high-strength modeling.
Embodiment 2
The processing method for present embodiments providing a kind of magnesium alloy center collet, wherein the material that the present embodiment uses for
The AZ31B magnesium alloy slab 115 of the diameter 100mm of semi-continuous casting preparation.Through analyzing, the 115 section ingredient segregation-free of slab,
Microstructure is consistent.
In detail, method includes the following steps:
Firstly, the precast body 101 of one AZ31B magnesium alloy material of machining, gradient is 3 °, point diameter 15mm, after
End diameter is 35mm.Then, precast body 101 is closely placed in intermediate dummy block 105 and squeezed out in 107 inner cavity of prod cast, together with outer
Dummy block 103 is combined into the crowded upsetting mold 100 of complete set.Then, whole set of die 100 and slab 115 are placed in homogenization
In furnace, respectively in 400 DEG C and 360 DEG C heat preservation 2h, guarantee mold and 115 heat penetration of slab；The extrusion cylinder of extruder is warming up to simultaneously
400℃.Then, preheated whole set of die 100 is packed on extruder, slab 115 is put into extrusion cylinder, carries out extruding examination
It tests, extrusion speed 0.3mm/s.Finally, it is good for 35mm, surface quality to prepare diameter through crowded upsetting mold 100 of the invention
Bar.Complete dynamic recrystallization has occurred in the bar prepared through crowded upsetting mold 100 of the invention, and microstructure is complete
Tiny equiax crystal, room temperature tensile intensity and elongation are respectively 282MPa and 26.0%.
Then, extruded bar from magnesium alloy is machined to rule identical as the copper alloy machining center collet bought in the market
The machining center collet of lattice；Then after differential arc oxidation and electrophoretic surface combined processing, commercial magnesium alloy machining center folder is formed
Set.
The copper alloy machining center collet bought with magnesium alloy machining center collet prepared by the present invention and in the market is in phase
With 20 aluminium alloy coupons of processing under other test conditions.Through detecting, the coupon processed with magnesium alloy machining center collet is average
Surface roughness is 0.38 μm, and the coupon average surface roughness of copper alloy machining center collet processing is 0.94 μm.
In conclusion the crowded upsetting mold 100 that the embodiment of the present invention provides is suitable for the bar industrialization of big specification, high-strength modeling
Production.In extrusion process, which plays two refinement crystal grain processes of conventional extrusion and jumping-up.The former passes through mold inner-cavity
Internal diameter becomes smaller to realize, the latter is the lower specimen finish of reverse extrusion power played the role of by the precast body 101 being pre-placed
It is realized from the small upsetting process for becoming required size.The bar of big specification, high-strength modeling can be prepared by squeezing upsetting mold by this, be applicable in
In industries such as rail traffic, automobile, sports apparatus, numerically-controlled machine tools.
The crowded upsetting processing method for the crowded upsetting mold 100 that the embodiment of the present invention provides, the extrusion stick that this method squeezes
Material has big specification, the beneficial effect of high-strength modeling.
The excessively above-mentioned crowded upsetting processing method of the magnesium alloy center collet that the embodiment of the present invention provides processes to obtain.Squeeze upsetting mould
Tool plays two refinement crystal grain processes of conventional extrusion and jumping-up.The former is realized by becoming smaller for mold inner-cavity internal diameter, the latter
It is that the reverse extrusion power played the role of by the precast body 101 being pre-placed descends specimen finish from the small jumping-up for becoming required size
Process is realized.By this squeeze upsetting mold can prepare big specification, high-damping, high-strength modeling bar, then through differential arc oxidation and electrophoresis
Corrosion resistance is increased substantially after surface treatment.Magnesium alloy machining center collet disclosed by the invention is suitable for numerically-controlled machine tool etc.
Industry.
Embodiments described above is a part of the embodiment of the present invention, instead of all the embodiments.Reality of the invention
The detailed description for applying example is not intended to limit the range of claimed invention, but is merely representative of selected implementation of the invention
Example.Based on the embodiments of the present invention, obtained by those of ordinary skill in the art without making creative efforts
Every other embodiment, shall fall within the protection scope of the present invention.
Claims (10)
1. a kind of crowded upsetting mold, for cooperating precast body squeeze upsetting processing operation to produce extrusion bar, which is characterized in that its
Include:
Outer dummy block, intermediate dummy block and extrusion prod cast, three is provided with inner cavity, when three is sequentially connected, three's
Inner cavity is sequentially communicated；
The intracavity diameter of the outer dummy block should be not less than the outer diameter of the extrusion bar；
The intermediate dummy block and the extrusion prod cast for being arranged the precast body, and the shape of the precast body and it is described in
Between dummy block and it is described squeeze out prod cast cavity shape it is identical；
Wherein, the internal diameter of the left end of the intermediate dummy block is less than the outer diameter of the extrusion bar, the right side of the intermediate dummy block
The internal diameter at end is gradually increased to more than the outer diameter of the extrusion bar；The left end inner end diameter for squeezing out prod cast and the centre
The right end inner end diameter of dummy block is identical, and the internal diameter of the left end for squeezing out prod cast is gradually decrease to the outer of the extrusion bar
The internal diameter of diameter, the right end for squeezing out prod cast is greater than the outer diameter of the extrusion bar.
2. crowded upsetting mold according to claim 1, it is characterised in that:
The left end for squeezing out prod cast is tapered, and the gradient of conical section is in 1~10 °.
3. crowded upsetting mold according to claim 1, it is characterised in that:
The crowded upsetting mold further includes fixing piece, the fixing piece for be fixedly connected the outer dummy block, intermediate dummy block with
And squeeze out prod cast.
4. crowded upsetting mold according to claim 1, it is characterised in that:
The outer dummy block, the intermediate dummy block and the extrusion prod cast are provided with through-hole, when three's connection, three
Through-hole be interconnected form location hole, the crowded upsetting mold further includes the first positioning pin for cooperating with the location hole.
5. crowded upsetting mold according to claim 4, it is characterised in that:
The crowded upsetting mold further includes the second positioning pin, and second positioning pin is set in the extrusion prod cast, and with it is described
First positioning pin is vertical.
6. a kind of crowded upsetting processing method characterized by comprising
By precast body be put into crowded upsetting mold described in any one of claims 1 to 5 the intermediate dummy block and the extrusion
The type of prod cast is intracavitary, and is close to the intermediate dummy block and the inner wall setting for squeezing out prod cast；
Slab to be extruded is squeezed by the crowded upsetting mold.
7. crowded upsetting processing method according to claim 6, which is characterized in that squeeze the slab to be extruded by described
The step of upsetting mold is squeezed, specifically includes:
The crowded upsetting mold is placed in homogenization furnace, and keeps the temperature the first preset time under the first preset temperature；
The slab and extrusion cylinder are kept the temperature into the second preset time under the second preset temperature；
The crowded upsetting mold after preheating is placed on extruder, and the slab is put into the extrusion cylinder, starts to squeeze
Pressure.
8. crowded upsetting processing method according to claim 7, it is characterised in that:
First preset temperature be 380~450 DEG C, second preset temperature be 350~430 DEG C, it is described first it is default when
Between and second preset time be 1~2h.
9. a kind of magnesium alloy center collet characterized by comprising
By magnesium alloy by power to require any one of 1 to 5 described in described in any one of crowded upsetting mold or claim 6 to 8
Crowded upsetting processing method process to obtain extruded bar from magnesium alloy；
The extruded bar from magnesium alloy is machined to required dimensions, then carries out differential arc oxidation and the compound place of electrophoretic surface
Magnesium alloy center collet is obtained after reason.
10. magnesium alloy center according to claim 9 collet, it is characterised in that:
The magnesium alloy includes AZ31B magnesium alloy or ZK60 magnesium alloy.
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| CN201910185875.6A CN109772922B (en) | 2019-03-12 | 2019-03-12 | Extrusion-upsetting die, extrusion-upsetting processing method and magnesium alloy central jacket |
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| CN201910185875.6A CN109772922B (en) | 2019-03-12 | 2019-03-12 | Extrusion-upsetting die, extrusion-upsetting processing method and magnesium alloy central jacket |
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| CN110883122A (en) * | 2019-11-28 | 2020-03-17 | 中北大学 | Short-process large-deformation blank making method for large-size large-height-diameter-ratio magnesium alloy cast rod |
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| CN113953343A (en) * | 2021-10-14 | 2022-01-21 | 中车长春轨道客车股份有限公司 | Preparation method of upsetting and asymmetric extrusion compounded one-step method light alloy |
| CN114589284A (en) * | 2022-05-10 | 2022-06-07 | 中北大学 | One-fire cogging die and method for alloy bar and upsetting-extruding-upsetting large deformation method |
| CN114798783A (en) * | 2022-04-27 | 2022-07-29 | 西南铝业（集团）有限责任公司 | Preparation method of oversized aluminum alloy bar |
| CN115141945A (en) * | 2022-08-01 | 2022-10-04 | 立中四通轻合金集团股份有限公司 | Preparation method of aluminum-strontium intermediate alloy coiled material with strontium content of more than 10wt% |
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| CN110883294A (en) * | 2019-11-28 | 2020-03-17 | 中北大学 | Magnesium alloy cast rod upsetting-extruding composite short-flow large-deformation blank making die |
| CN110883122A (en) * | 2019-11-28 | 2020-03-17 | 中北大学 | Short-process large-deformation blank making method for large-size large-height-diameter-ratio magnesium alloy cast rod |
| CN110883122B (en) * | 2019-11-28 | 2021-01-01 | 中北大学 | Short-process large-deformation blank making method for large-size large-height-diameter-ratio magnesium alloy cast rod |
| CN111438213A (en) * | 2020-04-10 | 2020-07-24 | 中北大学 | Large-deformation composite extrusion preparation method of magnesium alloy profile for vertical hydraulic press |
| CN113953343A (en) * | 2021-10-14 | 2022-01-21 | 中车长春轨道客车股份有限公司 | Preparation method of upsetting and asymmetric extrusion compounded one-step method light alloy |
| CN114798783A (en) * | 2022-04-27 | 2022-07-29 | 西南铝业（集团）有限责任公司 | Preparation method of oversized aluminum alloy bar |
| CN114589284A (en) * | 2022-05-10 | 2022-06-07 | 中北大学 | One-fire cogging die and method for alloy bar and upsetting-extruding-upsetting large deformation method |
| CN115141945A (en) * | 2022-08-01 | 2022-10-04 | 立中四通轻合金集团股份有限公司 | Preparation method of aluminum-strontium intermediate alloy coiled material with strontium content of more than 10wt% |
| CN115141945B (en) * | 2022-08-01 | 2023-10-31 | 立中四通轻合金集团股份有限公司 | Preparation method of aluminum-strontium intermediate alloy coiled material with strontium content being more than 10wt% |
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