CN103878199A - Rotary extrusion die of homogenous high-toughness magnesium alloy cup-shaped component - Google Patents
Rotary extrusion die of homogenous high-toughness magnesium alloy cup-shaped component Download PDFInfo
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- CN103878199A CN103878199A CN201410029411.3A CN201410029411A CN103878199A CN 103878199 A CN103878199 A CN 103878199A CN 201410029411 A CN201410029411 A CN 201410029411A CN 103878199 A CN103878199 A CN 103878199A
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Abstract
The invention discloses a rotary extrusion die of a homogenous high-toughness magnesium alloy cup-shaped component. The rotary extrusion die of the homogenous high-toughness magnesium alloy cup-shaped component comprises a punch, a forming concave mold, a lower cushion plate, a lower template and an ejection rod for a rotary extrusion cup-shaped component; the punch is connected with an upper rotary workbench of a hydraulic machine with the upper rotary workbench and is an 'I'-shaped rotating member; the end part of the punch, which is in contact with an extrusion billet, is a conical body; the surface of the conical body is provided with non-communicated grooves with certain widths and depths; the round region at the central part of the surface of the conical body is provided with an open slot; a 'crossed' groove is formed in a bottom plane of a mold cavity of the forming concave mold; a through hole is formed in the middle of the bottom plane of the mold cavity; the forming concave mold and the lower cushion plate are fixed on the lower template from top to bottom to form a whole; the forming concave mold is connected with the lower cushion plate and the lower template; the middle parts of the lower cushion plate and the lower template are provided with an ejection rod through hole which is communicated with the through hole in the bottom of the mold cavity; the ejection rod is arranged in the ejector rod through hole and enters the mold cavity from the through hole or withdraws into the through hole from the mold cavity in a telescopic mode back and forth.
Description
Technical field
The invention belongs to Metal Forming technique and forming technique field, a kind of technology for magnesium alloy materials extrusion molding and modification specifically, particularly the rotary squeezing mould of a kind of shaping of magnesium alloy cup-shape member and Strengthening and Toughening.
Background technology
Along with the develop rapidly in the fields such as Aero-Space, defence and military, communications and transportation, in the urgent need to adopting high tough lightweight member to realize lightweight, wherein cup-shape member is one of the most representative version.Magnesium alloy density little (be aluminium 2/3, titanium 1/2), it is the lightest structural metallic materials, there is the advantages such as good specific strength, specific stiffness, heat-conductivity conducting, electromagnetic wave shielding, damping shock absorption, be widely used in the fields such as Aero-Space, communications and transportation, defence and military.Magnesium alloy cast product mechanical property is low, can not meet the requirement of load-carrying member; Plastic Forming can significantly improve the mechanical property of magnesium alloy component, has become domestic and international study hotspot.Magnesium alloy is that Patterns for Close-Packed Hexagonal Crystal structure, plasticity are poor, is shaped easy to crack, and the magnesium alloy cup-shape member of classical inverse extrusion molding, the tensile strength of circumferential and axial differs 30% left and right.The high-strength heat-resistant magnesium alloy that adds rare earth element, owing to having good high-temperature behavior, has better application prospect in Aero-Space, defence and military field; But due to component segregation be mingled with seriously, more conventional magnesium alloy plasticity is poorer, is shaped more easy to crack, the cup-shape member of classical inverse extrusion molding respectively more obvious to strength difference.Press twisting strain technique to come from the transformation of late 1950s the former Russian scholar to flat anvil jumping-up defective workmanship---to the axial linear movement of upper flat anvil compound one around axial rotatablely moving, to be harmful to friction and become useful shear action, the adverse effect that while having solved Upsetting, friction brings.The high pressure torsion of production application is a kind of special circumstances of pressing twisting strain technique at present, belongs to sever Plastic Deformation, can prepare block super fine crystal material.Its preparation technology is: deformable body bears the pressure-acting of approximately several gpa between concora crush head and die, concora crush head or die rotation simultaneously, and deformable body is also subject to strong shearing force effect, thereby obtains very large plastometric set.The severe plastic deformation that the Combined Loading mode of this high pressure and torsion produces can be refined to material grains micro-nano magnitude effectively, obtains the material without loose hole, has avoided the harmful effect of residual porosity to material production.At present, successfully develop the shaping hydraulic machine of up/down worktable rotary both at home and abroad, but utilized the pressure of these hydraulic presses to turn round forming technology, be generally used for the flat thin workpiece of circle that preparation size is less, the part that the definite shape that cannot be shaped requires is applied and is had some limitations in industrial production.
Summary of the invention
Main purpose of the present invention is for the shaping of magnesium alloy cup-shape member and Strengthening and Toughening, the rotary squeezing mould of the high Strengthening and Toughening magnesium alloy of a kind of homogeneous cup-shape member is proposed, this mould can effectively improve magnesium alloy formability, improve formed parts comprehensive mechanical property, overcome conventional extruded be shaped magnesium alloy cup-shape member respectively to the large shortcoming of strength difference.
To achieve these goals, the technical scheme of taking is:
A rotary squeezing mould for the high Strengthening and Toughening magnesium alloy of homogeneous cup-shape member, comprises rotary squeezing drift, female die for forming, lower bolster, lower bolster, push rod for cup-shape member; Described drift is connected with the upper rotary table of the hydraulic press of bringing rotary table, drift is " work " shaped rotary part, that one end head that drift contacts with extrusion billet is cone, cone surface is provided with the non-communication type groove of certain width and the degree of depth, and the border circular areas at cone centre of surface position is not slotted; The die cavity base plane of female die for forming offers " ten " font groove, in the middle of the die cavity base plane of female die for forming, offer through hole, described female die for forming, lower bolster is fixed on formation entirety on lower bolster from top to bottom, female die for forming is connected with lower bolster, lower bolster, the middle part of lower bolster and lower bolster is provided with the push-rod hole communicating with the through hole of the bottom of die cavity, described push rod is "T"-shaped, and large diameter "T"-shaped head is placed in through hole, and minor diameter shaft is placed in push-rod hole; Described drift, push-rod hole, through hole, die cavity are positioned at same central axis; Described push rod enters die cavity or recedes into through hole from die cavity in flexible back and forth mode from through hole.
Described non-communication type groove is " one " font, " ten " font or " bifurcation " font.
The cone angle a span of the end face of described drift is 1 °～3 °, and the cone angle beta of the non-communication type groove of drift is got 30 °～40 °.
The end face center fillet R >=100mm of described drift.
Rotary squeezing mould of the present invention is by processing non-communication type groove to drift, the die cavity base plane of female die for forming is offered groove, being used in conjunction with of groove by non-communication type groove and female die for forming, Main Function has following 5 points, (1) press and be twisted into shape for the rotation to extrusion 42, the ratio of height to diameter of the blank that rotary extrusion forming is used is larger, only depend on the end-face friction of the head of drift to be difficult to realize the continuous transmission of moment of torsion in blank inside, drift processes non-communication type groove, and be used in conjunction with the groove of female die for forming, can realize the continuous transmission of moment of torsion in larger ratio of height to diameter blank inside, now can more effectively bring into play the effect of shear stress, reduce axial deformation power, (2) make extrusion be subject to larger torsional interaction, be conducive to distortion and be delivered to the inside in cylindrical Upsetting district of extrusion, thereby improve the deformation uniformity of extrusion on axially, and for the extrusion that meets structural parameters d/D >=0.821, the deformation uniformity on extrusion is axial can further improve, (3) can reduce the relative sliding between the end face edge metal of extrusion and the end face of the head of drift, be conducive to increase the especially deflection of h/2 cross section of inside, cylindrical Upsetting district, reach better working hardening effect, and can improve the deformation uniformity of extrusion on axially.(4) working hardening effect is more outstanding, clamp-on the continuous filling (" floating-projection-floating-projection ... ") that the metal in the non-communication type groove of drift pivots in motion at drift, can make deformed area metal produce larger detrusion, crystal grain thinning, broken dendritic structure and impurity ability are stronger, and distortion Strengthening and Toughening effect is remarkable; (5) be conducive to strengthen the hydrostatic pressure of the cylinder deformed area metal below drift, the reply occurring while adding high temperature large deformation and recrystallization, cause grain refinement and softening behavior, makes magnesium alloy have very high plasticity.
Brief description of the drawings
Below in conjunction with accompanying drawing, the specific embodiment of the present invention is described in further detail.
Fig. 1 is the magnesium alloy cup-shape member cutaway view after extrusion molding of the present invention;
Fig. 2 is the magnesium alloy cup-shape member top view after extrusion molding of the present invention;
Fig. 3 is the magnesium alloy cup-shape member upward view after extrusion molding of the present invention;
Fig. 4 is the crimp metal flow subregion schematic diagram of extrusion of the present invention;
Fig. 5 is the assembly drawing of mould of the present invention;
Fig. 6 is the non-communication type groove of mould of the present invention " " font drift stereogram;
Fig. 7 is the non-communication type groove of mould of the present invention " " font drift cutaway view;
Fig. 8 is the non-communication type groove of mould of the present invention " " font drift upward view (in Fig. 7 A to);
Fig. 9 is the non-communication type groove of mould of the present invention " " font drift right view (in Fig. 7 B to);
Figure 10 is the non-communication type groove of mould of the present invention " ten " font drift schematic diagram;
Figure 11 is the non-communication type groove of mould of the present invention " bifurcation " font drift schematic diagram;
Figure 12 is the female die for forming cutaway view of mould of the present invention;
Figure 13 is the female die for forming top view (in Figure 12 C to) of mould of the present invention;
Figure 14 is the working state figure one of mould of the present invention;
Figure 15 is the working state figure two of mould of the present invention;
Figure 16 is the working state figure three of mould of the present invention;
Figure 17 is the working state figure four of mould of the present invention;
Detailed description of the invention
Below in conjunction with accompanying drawing and example, the present invention is further described.
The present invention illustrates rotary squeezing mould and the method for the high Strengthening and Toughening magnesium alloy of a kind of homogeneous cup-shape member by specific embodiment.
As shown in Fig. 5, Figure 14～17, the rotary squeezing mould 2 of the high Strengthening and Toughening magnesium alloy of a kind of homogeneous cup-shape member, comprises drift 22 for rotary squeezing cup-shape member, female die for forming 23, lower bolster 27, lower bolster 28, push rod 29; As shown in Fig. 6, Fig. 7, Fig. 9, described drift 22 is " work " shaped rotary part, that one end head 221 that drift 22 contacts with extrusion billet 41 (as shown in Figure 5) is cone, there is the non-communication type groove 222 (as shown in Fig. 5～Figure 11) of certain width and the degree of depth " one " font, " ten " font or " bifurcation " font on cone surface, the border circular areas of the certain diameter size at cone centre of surface position do not slot (as shown in Fig. 6, Fig. 7, Fig. 8, Figure 10, Figure 11); As shown in Figure 12～Figure 17, die cavity 231 base plane of female die for forming 23 are offered roomy " ten " font groove 232, in the middle of die cavity 231 base plane of female die for forming 23, offer through hole 233; Described female die for forming 23, lower bolster 27 is fixed on formation entirety on lower bolster 28 from top to bottom, female die for forming 23 is connected with lower bolster 27, lower bolster 28 with pin 26 by trip bolt 25, the middle part of lower bolster 27 and lower bolster 28 is provided with the push-rod hole 234 communicating with the through hole 233 of the bottom of die cavity 231, described push rod 29 is "T"-shaped, large diameter "T"-shaped head 291 is placed in through hole 233, and minor diameter shaft 292 is placed in push-rod hole 292; Described drift 22, push-rod hole 234, through hole 233, die cavity 231 are positioned at same central axis; Described push rod 29 enters die cavity 231 or recedes into through hole 233 from die cavity 231 from through hole 233 in flexible back and forth mode.
The high Strengthening and Toughening magnesium alloy of a kind of homogeneous cup-shape member rotary squeezing method, step:
(1), bar material baiting, blanking diameter is less than the magnesium alloy cup-shape member 1 outer diameter D 3mm～5mm of (as shown in Figure 1);
(2), homogenising heat treatment, form blank 40 (as shown in Figure 5);
(3), be shaped and prepare: above-mentioned rotary squeezing mould 2 is all heated to magnesium alloy bar forming temperature more than 30 DEG C, installation fixes into rotary squeezing mould 2, drift 22 is connected to (figure is not depending on going out) with the upper rotary table of the hydraulic press of bringing rotary table, die cavity 231 and blank 40 (as shown in Figure 5) spraying finish graphitic lubricant to drift 22 work bands (m size in Fig. 9) with non-communication type groove 222, female die for forming 23; Extruding is packed in the die cavity 231 of female die for forming 23 with magnesium alloy blank 40, as shown in Figure 5, drift 22 is realized the axially-movable of drift 22 and the motion that pivots by upper rotary table (figure depending on not going out), and lower bolster 28 is fixed on the lower table of hydraulic press (scheming depending on not going out);
(4), forming process: as Fig. 5, shown in Figure 14, first downward axially-movable one segment distance of rotary table on hydraulic press (figure is not depending on going out), drift 22 is clamp-oned in blank 40, rotary table on hydraulic press (figure depending on not going out) move downward until non-communication type groove 222 major parts of drift 22 by filled with metal, then, as shown in figure 15, rotary table on hydraulic press (figure is not depending on going out) loads blank 40 with axially-movable speed and the 2～5r/min speed that pivots of 2～10mm/s simultaneously, drift 22 carries out floating-projection-floating-projection filling continuously to the metal of clamp-oning in non-communication type groove 222 in drift 22 pivots motion, form just blank 41, in this process, the speed of pivoting must with axially-movable speed Proper Match, to prevent that the metal in the non-communication type groove 222 of drift 22 is cut off or forms fold defect, after extrusion molding completes, rotary table on hydraulic press (figure depending on not going out) stops the rotation and rectilinear motion (as shown in figure 16) upwards, driving drift 22 to move up departs from extrusion 42, as shown in figure 17, the effect of liftout tank (figure is not depending on going out) by hydraulic press to push rod 29, the extrusion of extrusion molding 42 is ejected from female die for forming 23,
(4), extrusion 42 is finally processed to form to magnesium alloy cup-shape member 1 (as shown in Figure 1).
As Fig. 1, Fig. 2, shown in Fig. 3, the external diameter of the magnesium alloy cup-shape member 1 the present invention relates to is D, internal diameter is d, as shown in Figure 4, the metal flow subregion of the extrusion 42 of magnesium alloy cup-shape member 1 first being processed in the time of rotary extrusion forming comprises deformed area, rigid region, cylinder Upsetting district, Deformed ring district, wall of cup 11 is deformed area, the cup end 13 is rigid region, the bottom, cup chamber 14 at cup middle part, the ends 13 is cylinder Upsetting district, the cup end 13 is Deformed ring district with the junction 12 of wall of cup 11, for ensureing the deformation uniformity in short transverse, drift 22 ratio of height to diameter h/d≤0.2, cylinder Upsetting district below, ?
the Rational structure parameter of the high Strengthening and Toughening magnesium alloy of visible homogeneous involved in the present invention cup-shape member 1 is
The drift 22 of the rotary squeezing mould 2 of magnesium alloy cup-shape member of the present invention, it contacts end face and processes the non-communication type groove 222 (as shown in Figure 5, Figure 6) of certain width and the degree of depth with blank 40 with extruding.Non-communication type groove 222 shapes can be designed to " one " font, " ten " font, or the non-communication type groove 222 of " bifurcation " font is (as Fig. 6, Fig. 8, shown in Figure 10 and Figure 11), process being used in conjunction with of groove 232 (as shown in Figure 5) of non-communication type groove 222 and female die for forming 23, Main Function has following 5 points, (1) press and be twisted into shape (as shown in figure 15) for the rotation to extrusion 42, the ratio of height to diameter of the blank 40 that rotary extrusion forming is used is large (much larger than 0.2), only depend on the end-face friction of the head 221 of drift 22 to be difficult to realize the continuous transmission of moment of torsion in blank 40 inside, drift 22 processes non-communication type groove 222, and be used in conjunction with the groove 232 of female die for forming 23, can realize the continuous transmission of moment of torsion in larger ratio of height to diameter blank 40 inside, now can more effectively bring into play the effect of shear stress, reduce axial deformation power, (2) make extrusion 42 be subject to larger torsional interaction, be conducive to distortion and be delivered to the inside in cylindrical Upsetting district 14 of extrusion 42, thereby improve the deformation uniformity of extrusion 42 on axially, and for the extrusion 42 that meets structural parameters d/D >=0.821, the deformation uniformity on extrusion 42 is axial can further improve, (3) can reduce the end of extrusion 42 and relative sliding between the end face of the head 221 of edge metal and drift 22, be conducive to increase the especially deflection of h/2 cross section of 14 inside, cylindrical Upsetting district, reach better working hardening effect, and can improve extrusion 42 deformation uniformity on axially.(4) working hardening effect is more outstanding, clamp-on the continuous filling (" floating-projection-floating-projection ... ") that the metal in the non-communication type groove 222 of drift 22 pivots in motion at drift 22, can make deformed area metal produce larger detrusion, crystal grain thinning, broken dendritic structure and impurity ability are stronger, and distortion Strengthening and Toughening effect is remarkable; (5) be conducive to strengthen the hydrostatic pressure of drift 22 cylinder deformed area metal below, the reply occurring while adding high temperature large deformation and recrystallization, cause grain refinement and softening behavior, makes magnesium alloy have very high plasticity.
With external diameter 200mm, the cup shell of internal diameter 170mm is example, non-communication type groove 222 width b (as shown in Figure 8) the value 10mm left and right of drift 22, non-communication type groove 222 degree of depth h (as shown in Figure 9) the value 10mm left and right of drift 22, the end face 221 cone angle a (as shown in Figure 9) of drift 22 consider from favourable and metal flow and the angle that large as far as possible horizontal Friction Shearing Stress is provided, span can be 1 °～3 °, under the prerequisite that the end face 221 center fillet R (as shown in Figure 7) of drift 22 allow in structural design, should get as far as possible large value (R100mm left and right), the non-communication type groove cone angle beta (as shown in Figure 9) of drift 22, get 30 °～40 °, with the continuous filling that facilitates the metal of realizing in the non-communication type groove 222 of clamp-oning drift 22 to pivot in motion at drift 22, consider the filling of metal in non-communication type groove 222 and avoid clamp-oning metal in the non-communication type groove 222 of drift 22 pivoting in process and be cut off, the porch radius of corner r (as shown in Figure 9) of the non-communication type groove 222 of drift 22 gets 10mm left and right.
The female die for forming 23 of the rotary squeezing mould 2 of magnesium alloy cup-shape member 1 of the present invention, the base plane of die cavity 231 is offered " ten " font groove 232 (as shown in Figure 12 and Figure 13) of the large degree of depth (20～30mm) of large width (40～80mm), prevent that extrusion 42 from spinning under the turning effort of drift 22 in female die for forming 23, and the transmission of the suffered moment of torsion of blank while being conducive to rotary extrusion forming.
The rotary squeezing method of the high Strengthening and Toughening magnesium alloy of a kind of homogeneous of the present invention cup-shape member is compared with the classical inverse extrusion molding of magnesium alloy cup-shape member 1, having substantial technical characterstic with significant effect is: (1) has improved the crystallized ability of magnesium alloy materials: magnesium alloy inductile material, even if be at high temperature shaped, also very easily ftracture.This extrusion forming method has effectively improved the inside hydrostatic pressure of extrusion 42, and greatly degree improves the plasticity of magnesium alloy materials.Compared with classical inverse crimp, the inner each point equivalent plastic strain of extrusion 42 value can increase substantially.
(2) obtain high compact texture, thinning microstructure effect is remarkable, reduce extrusion 42 performance anisotropy: rotary extrusion forming method of the present invention has effectively improved the inside hydrostatic pressure of extrusion 42, produce larger shear strain amount by changing magnesium alloy materials internal stress strain regime, greatly the inner as-cast structure of the internal void of the seam extrusion 42 of degree, breaking deformation body, crystal grain thinning organize to submicron order even nanometer scale, form the aplitic texture with big angle crystal boundary, significantly strengthen the working hardening effect of magnesium alloy materials.This extrusion forming method can ensure the even tissue of extrusion 42, reduces extrusion 42 performance anisotropy.
(3) shortened the manufacturing process of high performance magnesium alloy cup-shape member 1: the plastic strain of classical inverse extrusion molding is limited, the working hardening effect not reaching.So before classical inverse extrusion molding, must obtain larger plastic deformation by multi-pass cylinder upsetting (sometimes also needing then to pull out) base.And extrusion forming method of the present invention, do not need jumping-up or pulling base, when directly utilizing axial compressive force and tangential shearing, effect just can obtain great plastic strain, and this contributes to broken dendritic structure and fragmentation impurity, significantly strengthens the working hardening effect of magnesium alloy materials.
The rotary squeezing method of the high Strengthening and Toughening magnesium alloy of a kind of homogeneous of the present invention cup-shape member is twisted into shape (high pressure torsion) with pressure and compares, and has substantial technical characterstic with significant effect to be:
(1) can extrusion molding the blank of arbitrary height: broken through press be twisted into shape (high pressure torsion) can only be for the preparation of the limitation of the less flat thin workpiece of size.
(2) can obtain larger shearing strain quantity, working hardening effect is more outstanding: pressing and being twisted into shape (high pressure torsion) is initiatively to rub and obtain shearing strain quantity between pressured head and blank.And extrusion forming method of the present invention, the active friction of the end face that not only drift 22 contacts with extrusion 42 can produce detrusion, and clamp-on the continuous filling pivoting in motion at drift 22 of metal in the non-communication type groove 222 of drift 22, can make deformed area metal produce larger detrusion, crystal grain thinning, broken dendritic structure and impurity ability are stronger.For magnesium alloy high-performance cup-shape member 1, extrusion forming method of the present invention does not need jumping-up (pulling) base, and manufacturing process is shorter.
(3) can reduce the axial load of deformable body requires, improves service life of equipment: want to obtain the working hardening effect same with the present invention, pressure is twisted into shape (high pressure torsion) backward extrusion cup-shape member must be by means of active friction larger between pressure head and blank, under identical lubricating condition, pressure is twisted into the axial load of shape (high pressure torsion) backward extrusion cup-shape member and requires higher.Coupling axially-movable and the hydraulic press upper table pivoting, if axial load is excessive, must accelerate the wearing and tearing of thrust bearing part, reduces the service life of equipment.
The present invention, for magnesium alloy cup-shape member 1 provides a kind of short flow process, high performance manufacture method, also provides reference for preparing the brilliant material of magnesium alloy ultra-fine.Along with the raising of lightweight level and the lifting day by day of war skill index (speed, reliability, bearing capacity etc.) of new-type weapon and equipment, demand for the little magnesium alloy high-performance cup-shape member of performance anisotropy is increasing, and application prospect of the present invention will be become better and better.
Claims (4)
1. a rotary squeezing mould for the high Strengthening and Toughening magnesium alloy of homogeneous cup-shape member, is characterized in that: comprise rotary squeezing drift, female die for forming, lower bolster, lower bolster, push rod for cup-shape member; Described drift is connected with the upper rotary table of the hydraulic press of bringing rotary table, drift is " work " shaped rotary part, that one end head that drift contacts with extrusion billet is cone, cone surface is provided with the non-communication type groove of certain width and the degree of depth, and the border circular areas at cone centre of surface position is not slotted; The die cavity base plane of female die for forming offers " ten " font groove, in the middle of the die cavity base plane of female die for forming, offer through hole, described female die for forming, lower bolster is fixed on formation entirety on lower bolster from top to bottom, female die for forming is connected with lower bolster, lower bolster, the middle part of lower bolster and lower bolster is provided with the push-rod hole communicating with the through hole of the bottom of die cavity, described push rod is "T"-shaped, and large diameter "T"-shaped head is placed in through hole, and minor diameter shaft is placed in push-rod hole; Described drift, push-rod hole, through hole, die cavity are positioned at same central axis; Described push rod enters die cavity or recedes into through hole from die cavity in flexible back and forth mode from through hole.
2. the rotary squeezing mould of the high Strengthening and Toughening magnesium alloy of a kind of homogeneous as claimed in claim 1 cup-shape member, is characterized in that: described non-communication type groove is " one " font, " ten " font or " bifurcation " font.
3. the rotary squeezing mould of the high Strengthening and Toughening magnesium alloy of a kind of homogeneous as claimed in claim 1 or 2 cup-shape member, it is characterized in that: the cone angle a span of the end face of described drift is 1 °～3 °, the cone angle beta of the non-communication type groove of drift is got 30 °～40 °.
4. the rotary squeezing mould of the high Strengthening and Toughening magnesium alloy of a kind of homogeneous cup-shape member as described in claim 1 or 3, is characterized in that: the end face center fillet R >=100mm of described drift.
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| CN201410029411.3A CN103878199B (en) | 2014-01-14 | 2014-01-14 | A kind of rotary squeezing mould of homogeneous high Strengthening and Toughening magnesium alloy cup-shape member |
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| US10265746B2 (en) | 2016-09-01 | 2019-04-23 | North University Of China | Rotary extrusion producing method for producing inner ring rib with large aspect ratio formed of hollow billet |
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| US10265747B2 (en) | 2016-09-01 | 2019-04-23 | North University Of China | Rotary extrusion producing mold for producing inner ring rib with large aspect ratio formed of hollow billet |
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