CN109465308A - A kind of mold and its forming method squeezing interior muscle with idler wheel rotation - Google Patents
A kind of mold and its forming method squeezing interior muscle with idler wheel rotation Download PDFInfo
- Publication number
- CN109465308A CN109465308A CN201811627664.5A CN201811627664A CN109465308A CN 109465308 A CN109465308 A CN 109465308A CN 201811627664 A CN201811627664 A CN 201811627664A CN 109465308 A CN109465308 A CN 109465308A
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- China
- Prior art keywords
- punch
- cavity die
- pin
- liner
- idler wheel
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
- B21C25/00—Profiling tools for metal extruding
- B21C25/02—Dies
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
- B21C23/00—Extruding metal; Impact extrusion
- B21C23/02—Making uncoated products
Abstract
The present invention relates to a kind of molds and its forming method that interior muscle is squeezed with idler wheel rotation.The technical scheme is that a kind of mold for squeezing interior muscle with idler wheel rotation, it includes seperated punch-pin, upper cavity die, key, lower cavity die, turntable, pallet, sand core liner and steel ring liner, the pallet is located at the bottom of lower cavity die and is coupled with turntable by feather key, the bottom surface of the lower cavity die is connect with turntable, the upper cavity die is connect by bolt with lower cavity die, the sand core inside lining filling is in the inner cavity of the conically shaped base squeezed, the steel ring liner is located at the periphery of sand core liner upper surface, and the fission punch-pin is on upper die holder.Forming step are as follows: the mold of muscle, which is mounted on crowded rotation machine, in squeezing with idler wheel rotation connect turntable with the crowded turn Force system of crowded rotation machine, then cone cylinder base is put into the inner cavity of upper cavity die and lower cavity die, sand core liner, steel body liner are sequentially placed into the inner cavity of cone cylinder base, for seperated punch-pin to go to the groove profile position of cylinder inboard wall in the state of merging, rotating roller is ground into type.
Description
Technical field
The present invention relates to a kind of molds and its forming method that interior muscle is squeezed with idler wheel rotation, it belongs to cartridge type part inner wall and fills at muscle
It sets and forming method technical field.
Background technique
Large-scale cartridge type part is widely used in the fields such as navigation, aerospace, military affairs.Large-scale cartridge type part inner wall upper inner ring muscle
Forming be Plastic Forming large size cylindrical member technical bottleneck.
The manufacture of muscle is generally using welding either using the method for monoblock cast at muscle in traditional large size cartridge type part, this two
Kind is too low at interior muscle anti-pressure ability formed by muscle method, cannot bear big load, is also unable to satisfy the performance requirement of high fatigue, thinks
Improve the performance of interior muscle, it is necessary to which the method using forging is integrally formed by large-scale workpiece and interior muscle, but traditional is forged into
The bottleneck problem of the method for interior muscle is to be difficult to demould after forging.
To be difficult to demould after solving the problems, such as forging, Chinese patent ZL201410764746.X discloses " a kind of cylindrical member
Interior transverse bar extrusion die ", the mold include upper die holder, voussoir, left punch-pin, right punch-pin, cavity plate, limiter, lower die holder and rotation
Device, left punch-pin, right punch-pin pass through left punch retainer respectively, right punch retainer is mounted on upper die holder, and cavity plate passes through limit
Position device is fixed on the lower die seat, and rotating device drives cavity plate to realize rotation on the lower die seat.Although this mold can be in tubular
Interior transverse bar is squeezed out in the inner cavity of part, but since it relies on merely continuous method for upsetting in shaping during transverse bar, is caused into
Shape operating process complexity, mold temperature and blank temperature decline and the rising of blank hardness are made to need heating for multiple times；The mold is turning
Blank surface is contacted under extrusion process, and big shearing, large torque, big energy consumption, the defect of easy wrinkle is presented.The pushing of transverse bar in shaping
Power usually reaches 1000T or more, and therefore, that there is molding operations is complicated for the mold, forming efficiency is low, easy wrinkle and molding
The big disadvantage of pressure.
Summary of the invention
Present invention aim to address the complexity of molding operation existing for existing interior transverse bar extrusion die, forming efficiency
Low, easy wrinkle and the big technical problem of briquetting pressure, provide it is a kind of with idler wheel rotation squeeze in muscle mold and its forming method.
In order to solve the above technical problems, the technical solution adopted by the present invention is that:
A kind of mold squeezing interior muscle with idler wheel rotation comprising seperated punch-pin, upper cavity die, key, lower cavity die, turntable, pallet, sand
In-core lining and steel ring liner, the pallet are located at the bottom of lower cavity die and are located in the pallet hole of turntable center setting and outside pallet
Surface is coupled with turntable pallet hole by feather key, and the bottom surface of the lower cavity die is connect with turntable, the underrun of the upper cavity die
The top surface of bolt and lower cavity die connection, the key be located between upper cavity die bottom surface and lower cavity die top surface and be located at upper cavity die bottom surface and
In the keyway being arranged on lower cavity die top surface, the sand core inside lining filling is in the inner cavity of the conically shaped base squeezed, the steel ring liner
It is located at the periphery of sand core liner upper surface, the fission punch-pin is on upper die holder.
Further, the seperated punch-pin is made of two monomer punch-pin, and the monomer punch-pin is by body of punch, several duck's eggs
Shape idler wheel, copper sheathing and lower baffle plate composition, several oval idler wheel major parts are located at body of punch outwardly and are arranged close to outside bottom surface
Groove in, the angle between the oval idler wheel is 30 °, the copper sheathing be located at oval idler wheel both ends setting circular shaft
On, the lower baffle plate is fastened mounted in body of punch on the bottom surface in outside and with fastening screw lower baffle plate and body of punch, lower block
The distance that board bottom identity distance rolls working face is 8~10mm.
Further, the fovea superior mold cavity is equipped with eight stud slots.
Further, the steel ring liner is 6~8 valves.
It is a kind of to use the forming method that the mold of muscle in crowded is revolved with idler wheel, forming step are as follows:
1) large-scale cylindrical member blank is instead squeezed using stage body blank and is configured to cone cylinder base；
2) mold of muscle, which is mounted on crowded rotation machine, in squeezing with idler wheel rotation connects the crowded turn Force system of turntable and crowded rotation machine
It connects, seperated punch-pin is then put into cone cylinder base in the inner cavity of upper cavity die and lower cavity die, sand core liner, steel body on upper die holder
Liner is sequentially placed into the inner cavity of cone cylinder base, and seperated punch-pin drives seperated punch-pin with combined state under press ram effect
It comes downwards at the groove profile position of cylinder inboard wall；
3) upper cavity die and lower cavity die are rotated under the drive for squeezing turn Force system by turntable, while seperated punch-pin is radially transported
Dynamic separation squeezes cone cylinder base cylinder inboard wall and reaches grooved size stopping；
4) upper cavity die and lower cavity die continue to rotate with constant angular velocity by turntable, and press ram drives separated
Seperated punch-pin is with the speed downlink of 0.5mm/s~1.5mm/s, the downlink oval roller roller that seperated punch-pin bottom surface is arranged in the process
The cone cylinder base cylinder inboard wall material of contact is ground, cylinder inboard wall material is deformed between steel ring liner and groove profile, formed to contract
Interior transverse bar；
5) roller is ground to form interior transverse bar after, seperated punch-pin radial motion merges, and press ram uplink takes away seperated punch-pin
Cylinder, pallet uplink under the action of crowded rotation machine mandril, by the related sand core liner of cylinder and steel body liner mixing core from fovea superior
It is ejected in the inner cavity of mould and lower cavity die, sand core liner is smashed after cylinder is air-cooled, will taken out after 8 valves of steel body liner point, squeeze medial rotation
Muscle process terminates.
The invention has the benefit that
1, the present invention is used in the sand core used in casting technique in crowded rotation annular in transverse bar technique, reaches interior transverse bar forming
To forming and modified dual purpose.If blank forming is constrained using sand core merely, due to being influenced by temperature and pressure,
Material stress under the conditions of solid-state flows can greatly burst sand core corner angle, and vertex angle part is caused in workpiece under muscle to generate to fold and lack
It falls into；Gravel on sand core can be squeezed into workpiece in muscle, so that interior muscle material is generated dreg defect, workpiece is caused to be scrapped.The present invention adopts
Sand core is covered with steel ring liner, and steel ring liner is divided into eight pieces, neither influences to use, and facilitate taking-up, avoids sand core
It collapses, it is accurate to improve forming.
2, the present invention can satisfy the radial and axial working condition of seperated punch-pin using oval roller, and roller be not added
Punch-pin is compared, and axis downward pressure is small, and press tonnage is small, and mold safety is good, and material will not generate folding.Muscle portion streamline is suitable
It is sliding, in a ring；The pressure of transverse bar only needs 200T or so in shaping.
3, oval roller arrangement of the invention improves metal toward central transference for the deformation of spreading that blank generates
Efficiency can be pushed continuously, and roller is ground, and overcome and shaped interior muscle in the process merely by multiple caused by continuous method for upsetting without roller
Miscellaneous molding operation, mold temperature and blank temperature decline and blank hardness are made to rise forming efficiency caused by heating for multiple times
The shortcomings that reduction.
4, the present invention is applied widely.The optimization of seperated punch-pin and moulding process so that the application of mold is more flexible,
The forming of one or multi-channel interior muscle can be completed in same workpiece with primary heating, and be convenient in demoulding quick.The present invention is applicable in
In φ 300mm to φ 2000mm, even greater cartridge type workpiece.
Detailed description of the invention
Fig. 1 is structural schematic diagram of the invention；
Fig. 2 is the bottom view of seperated punch-pin of the invention；
Fig. 3 is the partial structural diagram of seperated punch-pin of the invention；
Fig. 4 is seperated punch-pin initial position schematic diagram of the invention；
Fig. 5 is that seperated punch-pin of the invention comes downwards to groove profile position view；
Fig. 6 is seperated punch-pin radial feed groove profile shaping schematic view of the invention；
Fig. 7 is that of the invention seperated punch-pin downlink, oval idler wheel roller are ground into the schematic diagram of type inner ring muscle；
Fig. 8 is the seperated punch-pin uplink of the present invention, steel body liner taking-up schematic diagram；
In figure: 1- fission punch-pin, 2- upper cavity die, 3- key, 4- lower cavity die, 5- turntable, 6- pallet, 7- sand core liner, 8- steel
Liner, 9- feather key are enclosed, 10- squeezes turn Force system, 11- body of punch, 12- oval idler wheel, 13- copper sheathing, 14- lower baffle plate, and 15- is tight
Gu screw, 16- oil cylinder.
Specific embodiment
The invention will be further described with reference to the accompanying drawings and examples.
As shown in Figure 1, one of the present embodiment squeezes the mold of interior muscle with idler wheel rotation comprising seperated punch-pin 1, upper cavity die
2, key 3, lower cavity die 4, turntable 5, pallet 6, sand core liner 7 and steel ring liner 8, the pallet 6 are located at the bottom of lower cavity die 4 and position
In the pallet hole of 5 center of turntable setting and 6 outer surface of pallet is coupled with 5 pallet hole of turntable by feather key 9, the lower cavity die 4
Bottom surface connect with turntable 5, the underrun bolt of the upper cavity die 2 is connect with the top surface of lower cavity die 4, and the key 3 is located at
Between 4 top surface of 2 bottom surface of cavity plate and lower cavity die and it is located in the keyway being arranged on 4 top surface of 2 bottom surface of upper cavity die and lower cavity die, the sand
For in-core lining 7 in the inner cavity of the conically shaped base squeezed, the steel ring liner is located at the periphery of 7 upper surface of sand core liner, described
Seperated punch-pin 1 is on upper die holder.
As shown in FIG. 1 to 3, the seperated punch-pin 1 is made of two monomer punch-pin, and the monomer punch-pin is by body of punch
11, several oval idler wheels 12, copper sheathing 13 and lower baffle plate 14 form, and several 12 major parts of oval idler wheel are located at punch-pin outwardly
For body 11 in the groove that outside bottom surface is arranged, the angle between the oval idler wheel 12 is 30 °, and the copper sheathing 13 is located at duck
12 both ends of egg type idler wheel setting circular shaft on, the lower baffle plate 14 mounted in body of punch 11 on the bottom surface in outside and with fasten spiral shell
Nail 15 fastens lower baffle plate 14 and body of punch 11, and distance of 14 bottom surface of lower baffle plate away from rolling working face is 8~10mm.
Further, 2 inner cavity of upper cavity die is equipped with eight stud slots.
Further, the steel ring liner 8 is 6~8 valves.
As shown in Fig. 1, Fig. 4~Fig. 8, one of the present embodiment using it is described with idler wheel revolve squeeze in muscle mold at
Type method, forming step are as follows:
1) large-scale cylindrical member blank is instead squeezed using stage body blank and is configured to cone cylinder base；
2) mold of muscle is mounted on crowded rotation machine the crowded turn Force system 10 for making turntable 5 Yu crowded rotation machine in squeezing with idler wheel rotation
Connection, seperated punch-pin 1 are then put into cone cylinder base in the inner cavity of upper cavity die 2 and lower cavity die 4, sand core liner on upper die holder
7, steel body liner 8 is sequentially placed into the inner cavity of cone cylinder base, and seperated punch-pin 1 is driven under press ram effect with combined state
Seperated punch-pin 1 comes downwards at the groove profile position of cylinder inboard wall；
3) upper cavity die 2 and lower cavity die 4 are rotated under the drive for squeezing turn Force system by turntable 5, while seperated punch-pin 1 exists
Radial motion separates under the action of oil cylinder 16, squeezes cone cylinder base cylinder inboard wall and reaches grooved size stopping；
4) upper cavity die 2 and lower cavity die 4 continue to rotate with constant angular velocity by turntable 5, and press ram drive has divided
From seperated punch-pin 1 with the speed downlink of 0.5mm/s~1.5mm/s, the oval of seperated 1 bottom surface of punch-pin setting during downlink
12 roller of roller grinds the cone cylinder base cylinder inboard wall material of contact, and cylinder inboard wall material deforms between steel ring liner 8 and groove profile, inwardly
Shrink transverse bar in being formed；This roller compaction process can underlying materials jumping-up, grind wide, due to steel body liner 8 and sand core liner 7 etc. by
Core, upper cavity die 2 and the constraint of lower cavity die 4 will not deform, therefore cylinder inboard wall material can only become between steel body liner 8 and groove profile
Shape forms interior transverse bar；
5) roller is ground to form interior transverse bar after, radial motion under the action of oil cylinder 16 of seperated punch-pin 1 merges, on press ram
Row, takes away cylinder, uplink under the action of crowded rotation machine mandril of pallet 6, by the related sand core liner 7 of cylinder and steel for seperated punch-pin 1
8 mixing core of lining is ejected from the inner cavity of upper cavity die 2 and lower cavity die 4 in vivo, sand core liner 7 is smashed after cylinder is air-cooled, by steel
It is taken out after 8 point of 8 valve of lining in vivo, squeezing medial rotation muscle process terminates.
Claims (5)
1. it is a kind of with idler wheel rotation squeeze in muscle mold, it is characterised in that: including seperated punch-pin (1), upper cavity die (2), key (3), under
Cavity plate (4), turntable (5), pallet (6), sand core liner (7) and steel ring liner (8), the pallet (6) are located at the bottom of lower cavity die (4)
Portion is simultaneously located in the pallet hole of turntable (5) center setting and pallet (6) outer surface and turntable (5) pallet hole pass through feather key (9) connection
It connects, the bottom surface of the lower cavity die (4) is connect with turntable (5), underrun bolt and lower cavity die (4) of the upper cavity die (2)
Top surface connection, the key (3) are located between upper cavity die (2) bottom surface and lower cavity die (4) top surface and are located at upper cavity die (2) bottom surface under
In the keyway being arranged on cavity plate (4) top surface, the sand core liner (7) is mounted in the inner cavity of the conically shaped base squeezed, the steel ring
Liner is located at the periphery of sand core liner (7) upper surface, and the fission punch-pin (1) is on upper die holder.
2. a kind of mold for squeezing interior muscle with idler wheel rotation according to claim 1, it is characterised in that: the fission punch-pin (1)
It is made of two monomer punch-pin, the monomer punch-pin is by body of punch (11), several oval idler wheels (12), copper sheathing (13) and lower block
Plate (14) composition, several oval idler wheel (12) major parts are located at body of punch (11) close to the groove of outside bottom surface setting outwardly
In, the angle between the oval idler wheel (12) is 30 °, and the copper sheathing (13) is located at the setting of oval idler wheel (12) both ends
On circular shaft, the lower baffle plate (14) is on the bottom surface in body of punch (11) close outside and with fastening screw (15) lower baffle plate
(14) it is fastened with body of punch (11), distance of lower baffle plate (14) bottom surface away from rolling working face is 8~10mm.
3. a kind of mold for squeezing interior muscle with idler wheel rotation according to claim 1, it is characterised in that: in the upper cavity die (2)
Chamber is equipped with eight stud slots.
4. a kind of mold for squeezing interior muscle with idler wheel rotation according to claim 1, it is characterised in that: the steel ring liner (8)
For 6~8 valves.
5. a kind of use the forming method for revolving the mold of muscle in crowded described in Claims 1 to 44 with idler wheel, which is characterized in that at
Type step are as follows:
1) large-scale cylindrical member blank is instead squeezed using stage body blank and is configured to cone cylinder base；
2) mold of muscle is mounted on crowded rotation machine the crowded turn Force system (10) for making turntable (5) Yu crowded rotation machine in squeezing with idler wheel rotation
Connection, seperated punch-pin (1) are then put into cone cylinder base in the inner cavity of upper cavity die (2) and lower cavity die (4), sand on upper die holder
In-core lining (7), steel body liner (8) are sequentially placed into the inner cavity of cone cylinder base, and seperated punch-pin (1) is with combined state in press pressure machine sliding
Block effect is lower to drive seperated punch-pin (1) to come downwards at the groove profile position of cylinder inboard wall；
3) upper cavity die (2) and lower cavity die (4) are rotated under the drive for squeezing turn Force system by turntable (5), while seperated punch-pin
(1) radial motion separates, and squeezes cone cylinder base cylinder inboard wall and reaches grooved size stopping；
4) upper cavity die (2) and lower cavity die (4) continue to rotate with constant angular velocity by turntable (5), and press ram drives
The seperated punch-pin (1) of separation is with the speed downlink of 0.5mm/s~1.5mm/s, seperated punch-pin (1) bottom surface setting during downlink
Oval roller (12) roller grinds the cone cylinder base cylinder inboard wall material of contact, cylinder inboard wall material steel ring liner (8) and groove profile it
Between deform, form interior transverse bar to contract；
5) roller is ground to form interior transverse bar after, seperated punch-pin (1) radial motion merges, press ram uplink, by seperated punch-pin (1) band
From cylinder, pallet (6) uplink under the action of crowded rotation machine mandril mixes the related sand core liner (7) of cylinder and steel body liner (8)
Core is ejected from the inner cavity of upper cavity die (2) and lower cavity die (4), and sand core liner (7) are smashed after cylinder is air-cooled, by steel body liner
(8) it is taken out after dividing 8 valves, squeezing medial rotation muscle process terminates.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811627664.5A CN109465308B (en) | 2018-12-28 | 2018-12-28 | Mold with roller for rotationally extruding inner ribs and forming method of mold |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811627664.5A CN109465308B (en) | 2018-12-28 | 2018-12-28 | Mold with roller for rotationally extruding inner ribs and forming method of mold |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN109465308A true CN109465308A (en) | 2019-03-15 |
| CN109465308B CN109465308B (en) | 2020-06-09 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201811627664.5A Active CN109465308B (en) | 2018-12-28 | 2018-12-28 | Mold with roller for rotationally extruding inner ribs and forming method of mold |
Country Status (1)
| Country | Link |
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| CN (1) | CN109465308B (en) |
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110328251A (en) * | 2019-06-21 | 2019-10-15 | 武汉理工大学 | With the compound flowing forming device of outer muscle annular construction member near net and method |
| CN112453086A (en) * | 2020-09-30 | 2021-03-09 | 中北大学 | Multi-motion-form pressing and twisting combined loading extrusion equipment |
| CN113051676A (en) * | 2021-03-08 | 2021-06-29 | 武汉理工大学 | Prediction method for forming limit of thin-wall internal ring rib conical cylinder constraint rolling high rib |
| CN113059012A (en) * | 2021-03-17 | 2021-07-02 | 中北大学 | Extrusion-stretching composite forming method for large-height-diameter-ratio conical cylinder |
| CN113059011A (en) * | 2021-03-17 | 2021-07-02 | 中北大学 | Extrusion and stretching composite forming equipment for forming large conical cylinder |
| CN113102537A (en) * | 2021-04-14 | 2021-07-13 | 中北大学 | Complete die suitable for labor-saving forming of large-size thin-wall conical shell |
| CN113182474A (en) * | 2021-04-09 | 2021-07-30 | 中北大学 | Forming method of cylinder workpiece with transverse inner ribs |
| CN114798796A (en) * | 2022-05-25 | 2022-07-29 | 中北大学 | Rotary extrusion forming die for weak-anisotropy high-strength tough magnesium alloy plate |
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| CN103567248A (en) * | 2013-10-21 | 2014-02-12 | 中北大学 | Extrusion forming mold for cylinder with rib-equipped inner and outer special-shaped surfaces |
| CN106424188A (en) * | 2016-09-01 | 2017-02-22 | 中北大学 | Rotary extrusion forming mold for forming large depth-width ratio inner ring rib through hollow blank |
| CN108687152A (en) * | 2018-05-03 | 2018-10-23 | 燕山大学 | A kind of two-way point of mould rotary extradition forming die of inner ring muscle and die sinking method |
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| JPS5884610A (en) * | 1981-11-13 | 1983-05-20 | Machiyama Seisakusho:Kk | Forming of metallic vessel |
| CN103567248A (en) * | 2013-10-21 | 2014-02-12 | 中北大学 | Extrusion forming mold for cylinder with rib-equipped inner and outer special-shaped surfaces |
| CN106424188A (en) * | 2016-09-01 | 2017-02-22 | 中北大学 | Rotary extrusion forming mold for forming large depth-width ratio inner ring rib through hollow blank |
| CN108687152A (en) * | 2018-05-03 | 2018-10-23 | 燕山大学 | A kind of two-way point of mould rotary extradition forming die of inner ring muscle and die sinking method |
Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110328251A (en) * | 2019-06-21 | 2019-10-15 | 武汉理工大学 | With the compound flowing forming device of outer muscle annular construction member near net and method |
| CN112453086A (en) * | 2020-09-30 | 2021-03-09 | 中北大学 | Multi-motion-form pressing and twisting combined loading extrusion equipment |
| CN113051676A (en) * | 2021-03-08 | 2021-06-29 | 武汉理工大学 | Prediction method for forming limit of thin-wall internal ring rib conical cylinder constraint rolling high rib |
| CN113051676B (en) * | 2021-03-08 | 2022-06-10 | 武汉理工大学 | Prediction method for forming limit of thin-wall internal ring rib conical cylinder constraint rolling high rib |
| CN113059012A (en) * | 2021-03-17 | 2021-07-02 | 中北大学 | Extrusion-stretching composite forming method for large-height-diameter-ratio conical cylinder |
| CN113059011A (en) * | 2021-03-17 | 2021-07-02 | 中北大学 | Extrusion and stretching composite forming equipment for forming large conical cylinder |
| CN113182474A (en) * | 2021-04-09 | 2021-07-30 | 中北大学 | Forming method of cylinder workpiece with transverse inner ribs |
| CN113182474B (en) * | 2021-04-09 | 2022-04-15 | 中北大学 | Forming method of barrel workpiece with transverse inner ribs |
| CN113102537A (en) * | 2021-04-14 | 2021-07-13 | 中北大学 | Complete die suitable for labor-saving forming of large-size thin-wall conical shell |
| CN113102537B (en) * | 2021-04-14 | 2022-03-15 | 中北大学 | Complete die suitable for labor-saving forming of large-size thin-wall conical shell |
| CN114798796A (en) * | 2022-05-25 | 2022-07-29 | 中北大学 | Rotary extrusion forming die for weak-anisotropy high-strength tough magnesium alloy plate |
| CN114798796B (en) * | 2022-05-25 | 2023-12-26 | 中北大学 | Rotary extrusion forming die for weak-anisotropy high-strength and high-toughness magnesium alloy plate |
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|---|---|
| CN109465308B (en) | 2020-06-09 |
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