CN109759471A - A kind of equal channel pressings mold preparing ultra-fine crystal block body material and method - Google Patents
A kind of equal channel pressings mold preparing ultra-fine crystal block body material and method Download PDFInfo
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- CN109759471A CN109759471A CN201811553927.2A CN201811553927A CN109759471A CN 109759471 A CN109759471 A CN 109759471A CN 201811553927 A CN201811553927 A CN 201811553927A CN 109759471 A CN109759471 A CN 109759471A
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Abstract
The invention discloses a kind of equal channel pressings mold for preparing ultra-fine crystal block body material and methods, mold includes Extruding die and pedestal, Extruding die is equipped with six squeezing passages extended inward from outer surface, six squeezing passages are crossed to form a regular hexahedron type chamber, a formed punch is slidably equipped in each squeezing passage, pedestal is equipped with the multiposition positioning mechanism for positioning to Extruding die and any pair of squeezing passage for being divided into regular hexahedron type chamber opposite sides can be made to arrange according to setting form, setting form arrangement is: this is slid in and out the formed punch having in a squeezing passage in squeezing passage by the prevention of multiposition positioning mechanism, this is in another squeezing passage in squeezing passage can be protruded into the angle squeezed formed punch by Outer extrusion.Method is to squeeze the formed punch in squeezing passage one by one using extrusion equipment by changing the angle of Extruding die positioning on the base.The present invention has many advantages, such as that labor intensity is low, at low cost, preparation efficiency is high.
Description
Technical field
The present invention relates to material process unit technical fields, and in particular to a kind of equal channels for preparing ultra-fine crystal block body material
Extrusion die and method.
Background technique
In materials processing technology field, traditional plastic processing method realizes that the process of large deformation is usually the mistake of variable cross-section
Journey while material structure refines, also there is very strong directionality, and grain structure is often attenuated elongation, forms streamline.It is terrible
The processing method for developing special refinement crystal grain again to more tiny and equiaxial microscopic structure, people: large plastometric set method,
Such as Equal Channel Angular Pressing (ECAP), high pressure torsion deformation, pack rolling, repeatedly wrinkle-straightening, reciprocating extrusion.
Severe Plastic Deformation Methods are primarily referred to as under the conditions of lower temperature, elevated pressures, material are passed through primary or more
Secondary accumulative plastic deformation repeatedly, makes it obtain sizable accumulation true strain；Purpose is to keep conventional blocks coarse-grain material direct
It is refined as the ultra-fine grained structure material with high-angle boundary.That is, to obtain Ultra-fine Grained/nano structural material, need
The following conditions: 1, deformation temperature wants low.Temperature is lower, and the crystal grain of acquisition is more tiny, and with the increase of rolling pass, deformation
Temperature will reduce, because the crystal grain of refinement has better plasticity；2, dependent variable is big.Dependent variable is the essence of large plastometric set
Place generally should be greater than 10 or more；3, the shape of deformation front and back material does not change.Large plastometric set has mould strength very high
It is required that it is relatively difficult once to obtain big true strain, so, the plastic deformation for realizing repeatedly be large plastometric set new technology development and
One of important references criterion of development；4, dependent variable wants sufficiently large per pass.It is not singly to emphasize that total accumulation strain amount is big, often
The dependent variable of passage will also reach a certain critical strain, could obtain enough dislocations, obtain the critical density hair of dislocation
Raw transformation forms subgrain, dislocation unit etc., the final Ultra-fine Grained/nano structural material for obtaining high-angle boundary.This is namely
More than one since century, the original of ultra-fine grain is but cannot get in industrial production using pressure processing methods such as forging, rollings always
Cause.
Large plastometric set method can not only prepare the sample of the large volumes such as metal, the alloy of different shape size, and
Other methods can be overcome, such as the disadvantages of powder metallurgic method, ball-milling method bring residual porosities, impurity, interface oxidation.Big modeling
Property deformable material generally has the feature that 1, is pollution-free；2, noresidue hole inside the Ultra-fine Grained prepared/nano structural material；
3, entire material structure is uniform；4, it has no mechanical damage and crackle.
The isogonism diameter mold used in materials processing technology area research is mainly L shape die cavity at present, i.e. two channel phases
Hand over L-shaped, embryo material is put into access road when extruding, squeezes out from exit passageway, and embryo material is then packed into access road again and is carried out
It repeatedly extrudes, the elasticity due to being extruded material restores and shape distortion, needs to carry out extruded material when repeating and charging
Correction or polishing；In addition, since the deflection that isogonism diameter extrusion die used at present squeezes generation per pass mainly depends on
Angle between two channels, it is desirable to obtain uniform, tiny Ultra-fine Grained and generally require repeatedly to squeeze, these are all seriously reduced
The processing efficiency of this method limits the industrial applications of this method.Although proposing some improved measures, such as using S-shaped,
The extrusion dies such as C-shaped, U-shaped, but there is also some defects, such as deformation route are single.
Summary of the invention
The technical problem to be solved in the present invention is to overcome the shortcomings of the prior art, provides a kind of labor intensity
Low, at low cost, preparation efficiency it is high prepare ultra-fine crystal block body material etc. channel pressings mold.Correspondingly providing a kind of use should
The method that equal channel pressings mold prepares ultra-fine crystal block body material.
In order to solve the above technical problems, the invention adopts the following technical scheme:
A kind of equal channel pressings mold preparing ultra-fine crystal block body material, including Extruding die and pedestal, it is described squeeze it is recessed
Mould is equipped with six squeezing passages extended inward from outer surface, and six squeezing passages are crossed to form a regular hexahedron type chamber, respectively
A formed punch is slidably equipped in squeezing passage, the pedestal is equipped with for positioning to Extruding die and can make to be divided into just for any pair
Multiposition positioning mechanism of the squeezing passage of hexahedron type chamber opposite sides according to setting form arrangement, the setting form arrangement
Be: this is slid in and out the formed punch having in a squeezing passage in squeezing passage by the prevention of multiposition positioning mechanism, this is to extruding
Another squeezing passage is in channel can be protruded into the angle squeezed formed punch by Outer extrusion.
Further improvement as above-mentioned equal channel pressings mold:
The multiposition positioning mechanism also have make a pair of of squeezing passage according to setting form arrange when prevent remaining two
The blocking surface that formed punch in squeezing passage is slid in and out.
The Extruding die is in regular hexahedron type, and six squeezing passages are respectively corresponded positioned at regular hexahedron type Extruding die
On six sides, the multiposition positioning mechanism is the positioning counterbore on pedestal, the shape and size of the positioning counterbore
It is consistent with the side of the regular hexahedron type Extruding die.
Six squeezing passages are respectively correspondingly arranged in the center of six sides of regular hexahedron type Extruding die, institute
The depth for stating positioning counterbore is less than one times of side length of regular hexahedron type Extruding die and is greater than the two of regular hexahedron type Extruding die
/ mono- times of side length.
The side length of the regular hexahedron type Extruding die is L1, and the side length of the regular hexahedron type chamber is L2, the positioning
The depth of counterbore is (L1+L2)/2.
The length of the formed punch is equal to regular hexahedron type Extruding die side length and subtracts regular hexahedron type chamber side length
Difference half.
The side wall of the positioning counterbore is equipped with groove, is formed between the groove and the Extruding die for being put into positioning counterbore
One avoiding space.
A method of ultra-fine crystal block body material is prepared using above-mentioned equal channel pressings mold, is included the following steps,
(A) it is put into formed punch in any five squeezing passages of Extruding die, will be squeezed by multiposition positioning mechanism recessed
Mould positions on the base, and being in the squeezing passage for not being put into formed punch can be protruded into squeeze formed punch by Outer extrusion
Angle；The squeezing passage that sample is never put into formed punch is put into that regular hexahedron type is intracavitary, then logical in the extruding for not being put into formed punch
Formed punch is put into road；Pedestal installation is fixed on extrusion equipment, arranges that the squeezing passage for being finally putting into formed punch vertically；
(B) formed punch in the squeezing passage arranged vertically is squeezed along direction from top to bottom using extrusion equipment；
(C) orientation angle for changing Extruding die by multiposition positioning mechanism, arranges that another squeezing passage vertically,
The formed punch in the squeezing passage arranged vertically is squeezed along direction from top to bottom using extrusion equipment；
(D) step (C) is repeated, until the formed punch in all squeezing passages is extruded equipment and is squeezed one by one.
Further improvement as the above method:
In the step (A), first squeezing passage is lubricated using lubricant before formed punch is put into squeezing passage, is being tried
Sample, which is put into before regular hexahedron type chamber, is first lubricated sample using lubricant.
It is extruded after equipment squeezed one by one in the formed punch in all squeezing passages, repeating step (C) makes at least one
Formed punch in squeezing passage is extruded equipment and squeezes more than twice.
Compared with the prior art, the advantages of the present invention are as follows: the of the invention equal channels for preparing ultra-fine crystal block body material are squeezed
Compression mould is located on multiposition positioning mechanism in use, pedestal is mounted on extrusion equipment by changing Extruding die
Angle can make any pair of squeezing passage be arranged to be suitble to be extruded the angle that equipment is squeezed, thus in extrusion process
Blank will be extruded by not needing takes out out of Extruding die, need to only be changed on Extruding die using multiposition positioning mechanism and respectively be squeezed
The angle in channel can be squeezed from multiple angles blank is extruded, and can be saved because repeating caused by charging to being squeezed
The work that green compact material is corrected and polishes can substantially reduce labor intensity, saves cost and improve preparation efficiency, phase
Than the mold for needing to repeat charging in tradition, the time more than 75% can be saved.
Detailed description of the invention
Fig. 1 is the schematic perspective view of equal channel pressings mold.
Fig. 2 is the decomposition texture schematic diagram of equal channel pressings mold.
Fig. 3 is the schematic view of the front view of equal channel pressings mold.
Fig. 4 is A-A schematic cross-sectional view in Fig. 3.
Fig. 5 is the initial metallographic microscope of sample in Application Example 1.
Fig. 6 is the metallographic microscope in Application Example 1 after the completion of sample extruding.
Fig. 7 is the initial metallographic microscope of sample in Application Example 2.
Fig. 8 is the metallographic microscope in Application Example 2 after the completion of sample extruding.
Marginal data:
1, Extruding die；11, squeezing passage；12, regular hexahedron type chamber；2, pedestal；21, positioning counterbore；3, formed punch；4, it tries
Sample.
Specific embodiment
The present invention is described in further detail below in conjunction with the drawings and specific embodiments.
Embodiment 1:
As shown in Figures 1 to 4, the present embodiment prepares the equal channel pressings mold of ultra-fine crystal block body material, including squeezes
Cavity plate 1 and pedestal 2, Extruding die 1 are equipped with six squeezing passages 11 extended inward from outer surface, six 11 phases of squeezing passage
Formation one regular hexahedron type chamber, 12 (not shown) namely six squeezing passages 11 is handed over to respectively correspond from regular hexahedron type chamber 12
Six faces extend to the outer surface of Extruding die 1, and a formed punch 3 is slidably equipped in each squeezing passage 11, and pedestal 2 is equipped with for crowded
It presses mould 1 and positions multiposition positioning mechanism, which can make to be divided into 12 phase of regular hexahedron type chamber any pair
The squeezing passage 11 of two sides is arranged according to setting form, can also change Extruding die 1 and be located in multiposition positioning mechanism
On angle, so that the selectable squeezing passage 11 for making any pair to be divided into 12 opposite sides of regular hexahedron type chamber is according to setting
Setting formula arrangement, setting form arrangement is: this is to having the formed punch 3 in a squeezing passage 11 by multiposition in squeezing passage 11
Positioning mechanism prevention slides in and out, this is in another squeezing passage 11 in squeezing passage 11 and can be protruded by Outer extrusion pair
The angle that formed punch 3 is squeezed.In this way, extrusion equipment can be used from the arranged direction to squeezing passage 11 to being extruded blank
It is squeezed.The grade channel pressings mold is in use, pedestal 2 is mounted on extrusion equipment, by changing the positioning of Extruding die 1
Angle on multiposition positioning mechanism can make any pair of squeezing passage 11 be arranged to be suitble to be extruded what equipment was squeezed
Angle is taken out out of Extruding die 1 to not need that blank will be extruded in extrusion process, need to only utilize multiposition localization machine
Structure changes the angle of each squeezing passage 11 on Extruding die 1, can squeeze from multiple angles blank is extruded, can save
Because repeating the work that is corrected and polish to blank caused by charging, can substantially reduce labor intensity, saving at
This can save the time more than 75% compared to traditional mold for needing to repeat to charge with raising preparation efficiency.The equal channels
Extrusion die can make to be extruded blank to be squeezed by each formed punch 3 always at 1 center of Extruding die, so that crystal grain refinement becomes more
Uniformly, final product quality can be improved.
In the present embodiment, multiposition positioning mechanism also has the resistance when arranging that a pair of of squeezing passage 11 according to setting form
The only blocking surface that the formed punch 3 in remaining two pairs of squeezing passage 11 slides in and out.Make remaining two pairs of squeezing passage 11 using blocking surface
Interior formed punch 3 can not slide in and out, it is ensured that stablize four faces holding position of the regular hexahedron type chamber 12 in addition to the direction of extrusion.
In the present embodiment, Extruding die 1 is in regular hexahedron type, and six squeezing passages 11 are respectively corresponded positioned at regular hexahedron type
On six sides of Extruding die 1, multiposition positioning mechanism is the positioning counterbore 21 on pedestal 2, the shape of positioning counterbore 21
Shape and size are consistent with the side of regular hexahedron type Extruding die 1.Regular hexahedron type Extruding die 1 can be with any one side
Front end face, which is inserted into positioning counterbore 21, forms positioning, squeezing passage 11 after insertion positioning on the front end face and with the front end face
Squeezing passage 11 on the side of opposite regular hexahedron type Extruding die 1 is as a pair of opposite squeezing passage 11, and before this
The formed punch 3 in squeezing passage 11 on end face is stopped by the bottom surface of positioning counterbore 21, the regular hexahedron type opposite with the front end face
Squeezing passage 11 on the side of Extruding die 1 is not blocked by any position of pedestal 2.The multiposition positioning mechanism is using simple
Regular hexahedron type structure and positioning counterbore 21 form, have structure is simple, at low cost, easy to operate, positioning stablity is reliable
The good advantage of property.
In the present embodiment, six squeezing passages 11 are respectively correspondingly arranged in six sides of regular hexahedron type Extruding die 1
Center, the depth of positioning counterbore 21, which is less than one times of side length of regular hexahedron type Extruding die 1 and is greater than regular hexahedron type, squeezes
Press the half times side length of mould 1.After regular hexahedron type Extruding die 1 is inserted into positioning counterbore 21, regular hexahedron type is squeezed
All at least part is located in positioning counterbore 21 squeezing passage 11 on 1 four sides of cavity plate, at this time four of positioning counterbore 21
Side wall is just used as blocking surface, prevents the formed punch 3 in four squeezing passages 11 from sliding in and out respectively.The positioning that setting is in this way is sunk
The side wall in hole 21 is the blocking surface of multiposition positioning mechanism, can be into one without stop member in addition is being separately provided
Step improves property simple and compact for structure and reduces cost.
In the present embodiment, the side length of regular hexahedron type Extruding die 1 is L1, and the side length of regular hexahedron type chamber 12 is L2, fixed
The depth of position counterbore 21 is (L1+L2)/2.After regular hexahedron type Extruding die 1 is inserted into positioning counterbore 21, regular hexahedron type is squeezed
Squeezing passage 11 on 1 four sides of cavity plate is just stopped by the side wall of positioning counterbore 21 completely, namely by positioning counterbore 21
Side wall contacts with the entire end face of the formed punch 3 in squeezing passage 11 and is formed blocking, can be improved prevent formed punch 3 slide in and out it is steady
Determine reliability, at the same in turn ensure regular hexahedron type Extruding die 1 have more multiple location be located at positioning counterbore 21 outside, convenient for taking
Put regular hexahedron type Extruding die 1.
In the present embodiment, the length of formed punch 3 is equal to 1 side length of regular hexahedron type Extruding die and subtracts regular hexahedron type chamber
The half of the difference of 12 side lengths.Namely one end of formed punch 3 it is concordant with the side of regular hexahedron type chamber 12 when, the other end with just
The side of hexahedron type Extruding die 1 is concordant, the feelings in the side for guaranteeing the reliable and stable maintenance regular hexahedron type chamber 12 of formed punch 3
Under condition, only a blocking surface concordant with regular hexahedron type 1 side of Extruding die need to be set it is prevented from formed punch 3 and slide in and out, it can
Reduce the complexity and setting difficulty of blocking surface.
In the present embodiment, the side wall of positioning counterbore 21 is equipped with groove, groove and the Extruding die 1 for being put into positioning counterbore 21
Between formed an avoiding space.The avoiding space protrudes into for artificial or tool, convenient for easily picking and placing Extruding die 1.
In the present embodiment, Extruding die 1 and pedestal 2 are all made of 3Cr2W8V mold steel making.
Preferably, in the equal channel pressings mold of the present embodiment, the outer dimension of regular hexahedron type Extruding die 1 is 40mm
× 40mm × 40mm processes the cavity mold through slot for being mutually perpendicular to and intersecting at three opposites center by wire cutting respectively, thus
Six squeezing passages 11 are formed, the cross sectional dimensions of squeezing passage 11 is 10mm × 10mm, and the size for being extruded embryo material is 10mm
× 10mm × 8mm, the cross sectional dimensions of formed punch 3 are 10mm × 10mm, and length 15mm, the size of pedestal 2 is 50mm × 50mm
× 30mm, the size of positioning counterbore 21 are 40mm × 40mm × 25mm.
The method for preparing ultra-fine crystal block body material using the equal channel pressings mold of the present embodiment, includes the following steps,
(A) it is put into formed punch 3 in any five squeezing passages 11 of Extruding die 1, will be squeezed by multiposition positioning mechanism
Press the positioning of mould 1 on the base 2, being in the squeezing passage for not being put into formed punch 3 11 can be protruded by Outer extrusion to formed punch 3
The angle squeezed；The squeezing passage 11 that sample 4 (being extruded blank) is never put into formed punch 3 is put into regular hexahedron type chamber 12
It is interior, formed punch 3 is then put into the squeezing passage 11 for not being put into formed punch 3；The installation of pedestal 2 is fixed on extrusion equipment, is made most
The squeezing passage 11 for being put into formed punch 3 afterwards is arranged vertically；Sample 4 is in hexahedron type, the cross section of two face and formed punch 3 (namely
The side view of regular hexahedron type chamber 12) geomery it is identical, the size in remaining four face is less than the cross section ruler of formed punch 3
It is very little；
(B) formed punch 3 in the squeezing passage 11 arranged vertically is squeezed along direction from top to bottom using extrusion equipment
Pressure；
(C) orientation angle for changing Extruding die 1 by multiposition positioning mechanism, makes another vertical cloth of squeezing passage 11
It sets, the formed punch 3 in the squeezing passage arranged vertically 11 is squeezed along direction from top to bottom using extrusion equipment；
(D) step (C) is repeated, until the formed punch 3 in all squeezing passages 11 is extruded equipment and is squeezed one by one.
In the present embodiment, in step (A), first using lubricant to squeezing passage 11 before formed punch 3 is put into squeezing passage 11
It is lubricated, frictional resistance can be reduced, slow down the abrasion of formed punch 3 and regular hexahedron type Extruding die 1；It is put into just in sample 4
First sample 4 is lubricated using lubricant before hexahedron type chamber 12, slows down the uneven of 4 metal flow of sample in extrusion process
Property, reduce a possibility that crackle generates.
This method has the advantages that step is simple and convenient to operate, is high-efficient.
In the present embodiment, it is extruded after equipment squeezed one by one in the formed punch 3 in all squeezing passages 11, repeats step
(C) make the formed punch 3 at least one squeezing passage 11 be extruded equipment to squeeze more than twice.Theoretically, nothing can be carried out
Limit time squeezes, to obtain infinitely great strain, until obtaining uniform, tiny crystal grain, prepares ultra-fine crystal block body material.Cause
This, which may be implemented in do not open mold in the case where carry out continuous production.
Application Example 1:
Using in embodiment 1 equal channel pressings mold and method prepare magnesium alloy ultra-fine crystal block body material, wherein squeeze
Equipment uses J23-63T stamping equipment, and the outer dimension of regular hexahedron type Extruding die 1 is 50mm × 50mm × 50mm, each to squeeze
The cross sectional dimensions of pressure passageway 11 is 10mm × 10mm.Sample 4 (extrusion billet) is the AM80 magnesium alloy under room temperature, sample 4
Having a size of 10mm × 10mm × 8mm.In step (A), after sample 4 is put into regular hexahedron type chamber 12, a 10mm of sample 4 ×
The formed punch 3 that the face face of 8mm is finally putting into.Finite element analysis determines that 1 Optimal Temperature of Extruding die is 327 DEG C, extrusion speed
7mm/s, it is according to the method for embodiment 1, each to the formed punch 3 in six squeezing passages 11 to squeeze once.Fig. 5 show sample 4
Initial metallographic microscope, (a)~(f) figure show the metallographic microscope after the completion of sample 4 squeezes per pass in Fig. 6.As can be seen that squeezing
When two passages, the shaft-like such as crystal grain is still in (are schemed) referring to a figure and b in Fig. 6, with the increase for squeezing passage, produce part before this
Deformation twin (is schemed) referring to c in Fig. 6, then individual twin mild distortions (scheming referring to d in Fig. 6), and then most of twin is mutual
It completes a business transaction and (schemes referring to e in Fig. 6), many tiny dynamic recrystallization crystal grain occur in final a small amount of crystal grain, crystallite dimension is about 6
μm (scheming referring to f in Fig. 6), the intensity of magnesium alloy at this time increases, but plasticity improve it is unobvious.
Application Example 2:
Using in embodiment 1 equal channel pressings mold and method prepare magnesium alloy ultra-fine crystal block body material, wherein squeeze
Equipment uses J23-63T stamping equipment, and sample 4 (extrusion billet) is the AM80 magnesium alloy that 6h is kept the temperature at 410 DEG C, sample 4
Having a size of 10mm × 10mm × 8mm.In step (A), after sample 4 is put into regular hexahedron type chamber 12, a 10mm of sample 4 ×
The formed punch 3 that the face face of 8mm is finally putting into.Finite element analysis determines that mold Optimal Temperature is 428 DEG C, and extrusion speed 9mm/s is pressed
It is each to the formed punch 3 in six squeezing passages 11 to squeeze once according to the method for embodiment 1.Fig. 7 show the initial gold of sample 4
Phasor, (a)~(f) figure show the metallographic microscope after the completion of sample 4 squeezes per pass in Fig. 8.As can be seen that squeezing a time
Afterwards, crystal grain in etc. shaft-like (scheming referring to a in Fig. 8), lower a time there is a small amount of twin (scheming referring to b in Fig. 8), with squeezing passage
Increase, generate the deformation twin (scheming referring to c in Fig. 8) of part mild distortion before this, then most of twin mutually completes a business transaction (ginseng
See that d schemes in Fig. 8), then occur many tiny dynamic recrystallization crystal grain in crystal grain, recrystallization volume fraction is up to 60%
(scheming referring to e in Fig. 8), final deformation twin has been converted to tiny dynamic recrystallization crystal grain, and recrystallization volume fraction reaches
100%, crystallite dimension is about 3 μm (scheming referring to f in Fig. 8), and the intensity and plasticity of magnesium alloy at this time are significantly improved.
The above is only a preferred embodiment of the present invention, protection scope of the present invention is not limited merely to above-mentioned implementation
Example.To those of ordinary skill in the art, obtained improvement and change in the case where not departing from the technology of the present invention concept thereof
It changes and also should be regarded as protection scope of the present invention.
Claims (10)
1. a kind of equal channel pressings mold for preparing ultra-fine crystal block body material, it is characterised in that: including Extruding die (1) and pedestal
(2), the Extruding die (1) is equipped with six squeezing passages (11) extended inward from outer surface, six squeezing passages (11)
It is crossed to form a regular hexahedron type chamber (12), is slidably equipped with a formed punch (3) in each squeezing passage (11), the pedestal (2) is equipped with
For being positioned to Extruding die (1) and any pair of squeezing passage for being divided into regular hexahedron type chamber (12) opposite sides can be made
(11) according to the multiposition positioning mechanism of setting form arrangement, setting form arrangement is: this in squeezing passage (11) to having
Formed punch (3) in one squeezing passage (11) is slid in and out by the prevention of multiposition positioning mechanism, this is to another in squeezing passage (11)
One squeezing passage (11) is in can be protruded into the angle squeezed formed punch (3) by Outer extrusion.
2. equal channel pressings mold according to claim 1, it is characterised in that: the multiposition positioning mechanism also has
A pair of of squeezing passage (11) is set to prevent the formed punch (3) in remaining two pairs of squeezing passage (11) sliding outward when arranging according to setting form
Dynamic blocking surface.
3. equal channel pressings mold according to claim 2, it is characterised in that: the Extruding die (1) is in regular hexahedron
Type, six squeezing passages (11) respectively correspond on six sides of regular hexahedron type Extruding die (1), and the multiposition is fixed
Position mechanism is the positioning counterbore (21) on pedestal (2), the shape and size of the positioning counterbore (21) and positive six face
The side of figure Extruding die (1) is consistent.
4. equal channel pressings mold according to claim 3, it is characterised in that: six squeezing passages (11) are right respectively
It should be set to the center of six sides of regular hexahedron type Extruding die (1), the depth of the positioning counterbore (21) is less than just
One times of side length of hexahedron type Extruding die (1) and the half times side length for being greater than regular hexahedron type Extruding die (1).
5. equal channel pressings mold according to claim 3, it is characterised in that: the regular hexahedron type Extruding die (1)
Side length be L1, the side length of the regular hexahedron type chamber (12) is L2, and the depth of the positioning counterbore (21) is (L1+L2)/2.
6. equal channel pressings mold according to claim 3, it is characterised in that: the length of the formed punch (3) is equal to positive six
Face figure Extruding die (1) side length subtracts the half of the difference of regular hexahedron type chamber (12) side length.
7. equal channel pressings mold according to claim 3, it is characterised in that: set on the side wall of the positioning counterbore (21)
It is fluted, an avoiding space is formed between the groove and the Extruding die (1) for being put into positioning counterbore (21).
8. a kind of using the method that equal channel pressings mold prepares ultra-fine crystal block body material described in claim 1, it is characterised in that:
Include the following steps,
(A) formed punch (3) are put into any five squeezing passages (11) of Extruding die (1), it will by multiposition positioning mechanism
Extruding die (1) is located on pedestal (2), and being in the squeezing passage (11) for not being put into formed punch (3) can be stretched by Outer extrusion
Enter the angle to be squeezed formed punch (3)；The squeezing passage (11) that sample (4) is never put into formed punch (3) is put into positive six face
In figure chamber (12), then it is put into the squeezing passage (11) for not being put into formed punch (3) formed punch (3)；Pedestal (2) are installed and are fixed
Onto extrusion equipment, arrange that the squeezing passage (11) for being finally putting into formed punch (3) vertically；
(B) formed punch (3) in the squeezing passage (11) arranged vertically is squeezed along direction from top to bottom using extrusion equipment
Pressure；
(C) orientation angle for changing Extruding die (1) by multiposition positioning mechanism, makes another squeezing passage (11) vertical cloth
It sets, the formed punch (3) in the squeezing passage arranged vertically (11) is squeezed along direction from top to bottom using extrusion equipment；
(D) step (C) is repeated, until the formed punch (3) in all squeezing passages (11) is extruded equipment and is squeezed one by one.
9. according to the method described in claim 8, it is characterized by: being put into squeezing passage in formed punch (3) in the step (A)
(11) first squeezing passage (11) is lubricated using lubricant before, is first adopted before sample (4) is put into regular hexahedron type chamber (12)
With lubricator sample (4) is lubricated.
10. according to the method described in claim 8, it is characterized by: the formed punch (3) in all squeezing passages (11) is extruded
After equipment is squeezed one by one, repeating step (C) makes the formed punch (3) at least one squeezing passage (11) be extruded equipment extruding
More than twice.
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| CN201811553927.2A CN109759471B (en) | 2018-12-18 | 2018-12-18 | Equal-channel extrusion die and method for preparing ultrafine crystal block material |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112207142A (en) * | 2020-09-24 | 2021-01-12 | 哈尔滨理工大学 | Multiple extrusion device and method for preparing layered heterogeneous magnesium alloy |
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| CN114871287A (en) * | 2022-05-10 | 2022-08-09 | 燕山大学 | Device and method for preparing aluminum-based nano material |
| CN114871287B (en) * | 2022-05-10 | 2023-03-24 | 燕山大学 | Device and method for preparing aluminum-based nano material |
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