CN111203508A - Continuous upsetting blank making die for magnesium alloy cast rod - Google Patents
Continuous upsetting blank making die for magnesium alloy cast rod Download PDFInfo
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- CN111203508A CN111203508A CN202010157110.4A CN202010157110A CN111203508A CN 111203508 A CN111203508 A CN 111203508A CN 202010157110 A CN202010157110 A CN 202010157110A CN 111203508 A CN111203508 A CN 111203508A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21J—FORGING; HAMMERING; PRESSING METAL; RIVETING; FORGE FURNACES
- B21J13/00—Details of machines for forging, pressing, or hammering
- B21J13/02—Dies or mountings therefor
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21J—FORGING; HAMMERING; PRESSING METAL; RIVETING; FORGE FURNACES
- B21J5/00—Methods for forging, hammering, or pressing; Special equipment or accessories therefor
- B21J5/06—Methods for forging, hammering, or pressing; Special equipment or accessories therefor for performing particular operations
- B21J5/08—Upsetting
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Abstract
The invention discloses a magnesium alloy cast rod continuous upsetting blank making die which comprises a male die, a male die lantern ring, an upper female die, a lower female die, a clamping ring and a mandril mechanism; the upper female die is coaxially arranged above the lower female die, and an upper cavity matched with the male die is arranged in the upper female die; the lower female die comprises an inner female die and an outer female die, a first lower cavity for movably nesting the inner female die is arranged in the outer female die, a ring groove for clamping a clamping ring is formed in the outer wall of the inner female die, the outer diameter of the clamping ring is larger than that of the inner female die, and a second lower cavity with the diameter larger than that of the upper cavity is arranged in the inner female die; the male die lantern ring can be sleeved outside the male die, and the sleeved male die can be matched with the second lower cavity; the ejector rod mechanism comprises a top plate, a vertical rod and a T-shaped ejector rod, the top plate is supported below the first lower cavity, a vertical groove is formed in the position, corresponding to the inner concave die, of the top plate, the vertical rod stretches up and down, the T-shaped ejector rod is connected to the lower end of the vertical rod, the cavity structure is movably changed by the ejector rod mechanism, and full large-size cast rods are continuously upset and subjected to large plastic deformation.
Description
Technical Field
The invention belongs to a metal extrusion forming technology, and is suitable for continuous large-deformation blank making of a large-height-diameter-ratio magnesium alloy cast rod with a height-diameter ratio far greater than 3.
Background
The continuous upsetting deformation means that different working sections of a cast rod (hereinafter referred to as a bar or a blank) are continuously changed by replacing different male dies, female dies and the like in the upsetting deformation process, and a larger strain is accumulated by using multi-pass deformation, so that the purpose of refining grains is achieved, and a schematic diagram of the continuous upsetting deformation is shown in fig. 1. The first step is as follows: placing the D1 XH 1 blank in a first group of dies for first upsetting forming, wherein the size of the finished blank is D2 XH 2; the second step is that: the D2 xh 2 billet was placed in a second set of dies for a second pass of upset forming to a finished billet size of D3 xh 3 (the upset could be continued to obtain the desired billet size) at which point the continuous upset forming was completed. Although the process has simple structure and convenient operation.
The following disadvantages still remain:
and in the continuous upsetting deformation process, because the blank sizes are different, the die is frequently replaced, and the production cost is high. For continuous upsetting deformation of the bar stock with the large height-diameter ratio, the forming effect is not easy to ensure.
Upset deformation is a non-uniform deformation process. The height/diameter ratio (h/D) of the cylindrical blank is generally limited to 2.5 during upsetting. In particular, when the height-diameter ratio is greater than 3, the cylindrical blank may be unstable, and "double drum" and folding defects may occur, so that subsequent deformation may not be performed.
Disclosure of Invention
The invention aims to provide a magnesium alloy cast rod continuous upsetting blank making die which skillfully utilizes an ejector rod mechanism to movably change a cavity structure, is fuller in forming, has stronger stability and saves materials.
In order to achieve the above purpose, the solution of the invention is: the magnesium alloy cast rod continuous upsetting blank making mold comprises a male mold, a male mold lantern ring, an upper female mold, a lower female mold, a clamping ring and a mandril mechanism which are arranged on an upper workbench of a press machine;
the upper female die is coaxially arranged above the lower female die, an upper cavity is formed in the upper female die and used for placing blanks, the male die is coaxially arranged above the upper cavity, and the diameter of the male die is the same as that of the upper cavity;
the lower female die comprises an inner female die and an outer female die fixed on a lower workbench of the press, a first lower cavity is arranged in the outer female die, the inner female die is movably nested in the first lower cavity, a ring groove for clamping a clamping ring is formed in the outer wall of the inner female die, the outer diameter of the clamping ring is larger than that of the inner female die, a second lower cavity is arranged in the inner female die, and the diameter of the second lower cavity is larger than that of the upper cavity;
the male die lantern ring can be sleeved on the outer side of the male die, and the diameter of the sleeved male die is the same as that of the second lower cavity;
the ejector rod mechanism comprises a top plate, a vertical rod and a T-shaped ejector rod, the top plate is supported below the first lower cavity, a vertical groove is formed in the position, corresponding to the inner concave die, of the top plate and supplies the vertical rod to stretch up and down, and the lower end of the vertical rod is connected with the T-shaped ejector rod.
Preferably, the outer wall of the male die is convexly provided with a limiting step, the limiting step is used for abutting against the top of the male die sleeve ring, and the height of the limiting step and the length of the male die sleeve ring are the same as the height of the upper cavity.
Preferably, a lubricating groove is formed between the outer concave die and the inner concave die and is formed in the inner wall of the outer concave die.
Preferably, the die further comprises a fastener, the outer female die is provided with a lower flange, an upper flange is arranged at a position of the upper female die corresponding to the lower flange, and fastening holes for the fastener to be matched and penetrated are coaxially formed in the upper flange and the lower flange, so that the upper female die is fixed above the outer female die.
Preferably, a gasket is arranged between the vertical rod and the concave die and fixed to the top of the vertical rod.
Preferably, the die comprises a male die fixing plate, the male die fixing plate is fixed on the upper workbench, a funnel-shaped through hole is formed in the middle of the male die fixing plate, the top of the male die is funnel-shaped, and the male die is placed into the through hole and is tightly matched with the through hole.
Preferably, the die comprises a female die fixing plate and a bolt, the female die fixing plate is fixed on the lower workbench, the female die fixing plate is provided with an inverted T-shaped hole for placing the bolt, the outer female die is placed on the female die fixing plate, a threaded hole is formed in the position corresponding to the inverted T-shaped hole, and the bolt extends out of the inverted T-shaped hole to be matched with the threaded hole of the outer female die.
After the scheme is adopted, the gain effect of the invention is as follows:
firstly, the height-diameter ratio of the formed blank is limited within 2.5, the double drum shape and the folding defect caused by instability are avoided, the large-size cast rod is continuously upset and thick and plastically deformed, and a certain foundation is laid for other deformation procedures.
And secondly, for the problem that the dies need to be frequently replaced due to different sizes of blanks in the continuous multi-pass upsetting deformation process, the invention only adopts the same set of dies all the time, effectively overcomes the defects of long process flow and complicated die assembly and disassembly in the conventional continuous upsetting deformation process, and reduces the production cost.
Thirdly, one of the characteristics of the invention lies in that the ejector rod mechanism is flexibly used, and the ejector rod mechanism not only retains the basic function of ejecting the blank, namely, after the blank is formed, the T-shaped ejector rod pushes the top plate and the vertical rod to eject the blank; when the blank is continuously upset and deformed, the vertical rod of the ejector rod mechanism pushes the inner concave die to move upwards to reserve a space, so that the structure of the cavity is changed, the flexible change of the structure of the cavity on the same group of dies is realized, and the method is unexpected when the traditional ejector rod mechanism is designed.
Fourthly, the invention adopts a special forming route, the bottom is firstly formed and then the whole is formed, the method has the advantages that the blank is formed more fully, the mechanical property is improved by forward expanding and extruding the formed bottom, and finally the full part is utilized to perform backward extrusion and integral forming, so that the blank is ensured to be continuously deformed and fill the die cavity, and finally the blank is enabled to obtain integral large plastic deformation.
And fifthly, a plurality of existing dies generate a large amount of excess materials, so that the size of the blank is reduced, the cleaning work is increased, no excess materials are generated, the complete blank can be obtained, resources are fully utilized, and a good concept of energy conservation and material conservation is kept.
Drawings
FIG. 1 is a schematic illustration of a conventional upsetting and press-deforming process;
FIG. 2 is a schematic view of the operation of placing the cylindrical blank into the mold before the continuous upsetting deformation in step S4 according to an embodiment of the present invention;
FIG. 3 is a schematic view of the operation of the continuous upsetting deformation process of step S5, wherein the lower portion of the male die completely enters the upper cavity and the blank completely fills the second lower cavity;
FIG. 4 is a schematic view of the working state of the female die ejected by the ejector mechanism and limited by the retainer ring to fall after the female die is removed in the continuous upsetting deformation process of step S6 according to an embodiment of the present invention;
FIG. 5 is a schematic view of the operation of the continuous upsetting deformation process of step S7 when the punch is fully returned to the position where the punch collar is attached;
FIG. 6 is a schematic view of the working state of the new punch structure composed of the punch and the punch collar entering the lower die during the continuous upsetting deformation of step S8 according to an embodiment of the present invention;
FIG. 7 is a schematic view illustrating the operation of the blank when the final forming is completed in the continuous upsetting deformation process of step S8 according to an embodiment of the present invention;
fig. 8 is a schematic view of the working state of the cylindrical mandrel ejecting the formed blank upwards after the new punch structure composed of the punch and the punch collar returns in the continuous upsetting forming process of step S9 according to an embodiment of the present invention.
Description of reference numerals: the die comprises a male die 1, a limiting step 11, a male die sleeve ring 2, an upper female die 3, an upper cavity 31, an upper flange 32, a lower female die 4, an inner female die 41, a second lower cavity 411, a ring groove 412, an outer female die 42, a first lower cavity 421, a threaded hole 422, a lower flange 423, a lubricating groove 424, a fastening hole 43, a snap ring 5, a mandril mechanism 6, a top plate 61, a vertical groove 611, a vertical rod 62, a T-shaped mandril 63, a gasket 64, a male die fixing plate 7, a through hole 71, a female die fixing plate 8, an inverted T-shaped hole 81, a bolt 9 and a blank.
Detailed Description
The invention is described in detail below with reference to the accompanying drawings and specific embodiments.
The invention provides a magnesium alloy cast rod continuous upsetting blank making die, which comprises a male die 1, a male die lantern ring 2, an upper female die 3, a lower female die 4, a snap ring 5, a mandril mechanism 6, a fastener (not shown), a male die fixing plate 7, a female die fixing plate 8 and a bolt 9, wherein the male die 1, the male die lantern ring 2, the upper female die 3, the lower female die 4, the snap ring 5, the mandril mechanism 6, the fastener (not shown), the male die fixing; the punch retainer 7 is fixed on the upper workbench, the funnel-shaped through hole 71 is formed in the middle of the punch retainer 7, the top of the punch 1 is funnel-shaped, the punch 1 is placed into the through hole 71 and is tightly matched with the through hole 71, and the funnel-shaped design simplifies and stabilizes the installation of the punch 1.
The upper female die 3 is coaxially mounted above the lower female die 4, the outer female die 42 is provided with a lower flange 423, the upper female die 3 is provided with an upper flange 32 at a position corresponding to the lower flange 423, and the upper flange 32 and the lower flange 423 are coaxially provided with fastening holes 43 for the fasteners 7 to be matched and penetrated, so that the upper female die 3 is fixed above the outer female die 42. An upper cavity 31 is arranged in the upper female die 3 and used for placing the blank 10, the male die 1 is coaxially arranged above the upper cavity 31, the diameter of the male die 1 is the same as that of the upper cavity 31, in other words, the upper cavity 31 can be matched with the male die 1 to enter;
the lower female die 4 comprises an inner female die 41 and an outer female die 42 fixed on a lower worktable (not shown in the figure) of the press machine, a first lower cavity 421 is arranged in the outer female die 42, the inner female die 41 is movably nested in the first lower cavity 421, an annular groove 412 for clamping the clamping ring 5 is formed in the outer wall of the inner female die 41, the outer diameter of the clamping ring 5 is larger than that of the inner female die 41, a second lower cavity 411 is arranged in the inner female die 41, when the clamping ring 5 is clamped in the annular groove 412, the clamping ring 5 limits the inner female die 41 to fall, a space of the second lower cavity 411 is reserved at the bottom of the inner female die 41, and the diameter of the second lower cavity 411 is larger than that of the upper cavity 31, so that conditions are provided for expanding and;
die holder plate 8 is fixed in workstation down, and die holder plate 8 is equipped with inverted T type hole 81 and is used for bolt 9 to put into, outer die 42 is placed on die holder plate 8 and is offered screw hole 422 in the position that corresponds inverted T type hole 81, and bolt 9 stretches out the screw hole 422 cooperation of inverted T type hole 81 and outer die 42, so, can make things convenient for the loading and unloading of outer die 42.
The male die sleeve ring 2 can be sleeved outside the male die 1, the sleeved male die 1 and the male die sleeve ring 2 form a new male die structure, the diameter of the sleeved male die 1 is the same as that of the second lower die cavity 411, in other words, the sleeved male die 1 can enter the second lower die cavity 411 in a matching manner; in an embodiment, the outer wall of the male die 1 is convexly provided with a limiting step 11, the limiting step 11 is used for abutting against the top of the male die sleeve ring 2, the height of the limiting step 11 and the length of the male die sleeve ring 2 are the same as the height of the upper cavity 31, on one hand, the height of the limiting step 11 is the same as the height of the upper cavity 31, the situation that the male die 1 does not exceed the upper cavity 31 when moving downwards to the limit can be exactly achieved, the blank 10 can be completely extruded into the second lower cavity 411, on the other hand, the height of the limiting step 11 is the same as the length of the male die sleeve ring 2, and the limiting step 11 can be positioned and sleeved on the male die 1 and.
The ejector rod mechanism 6 comprises a top plate 61, a vertical rod 62 and a T-shaped ejector rod 63, the top plate 61 is supported below the first lower cavity 421, a vertical groove 611 is formed in the position, corresponding to the inner concave die 41, of the top plate 61, the vertical groove 611 allows the vertical rod 62 to stretch up and down, and the lower end of the vertical rod 62 is connected with the T-shaped ejector rod 63. In order to reduce the friction loss between the vertical rod 62 and the female die 41, a washer 64 is arranged between the vertical rod 62 and the female die 41, and the washer 64 is fixed on the top of the vertical rod 62.
A continuous upsetting blank making method for a large-size large-height-diameter-ratio magnesium alloy cast rod relates to the continuous upsetting blank making die for the magnesium alloy cast rod, and comprises the following steps:
s1: blanking a cylindrical magnesium alloy bar;
s2: homogenizing the cylindrical magnesium alloy bar;
s3: heating the cylindrical blank 10 to a forming temperature and preserving heat, and heating a die required in the continuous upsetting deformation process to a temperature higher than the temperature of the cylindrical blank 10 and preserving heat;
s4: installing the preheated and heat-insulated die on a press machine, and uniformly spraying an organic graphite lubricant on the male die 1, the upper female die 3 and the lower female die 4; extending the cylindrical blank 10 subjected to the homogenization heat treatment from the upper cavity 31 of the upper female die 3 into the second lower cavity 411 of the inner female die 41, wherein the bottom of the blank 10 abuts against the top plate 61, and the top of the blank 10 remains in the upper cavity 31, as shown in fig. 2;
s5: after the blank 10 is placed, as shown in fig. 3, in the initial stage of continuous upsetting formation, the upper workbench of the press machine drives the male die 1 to move downwards through the male die fixing plate 7, the cylindrical blank 10 in the upper cavity 31 gradually enters the second lower cavity 411, and deformation continues until the blank 10 in the upper cavity 31 completely enters the second lower cavity 411, at this time, all the blanks 10 are filled in the second lower cavity 411, and the blank 10 is deformed for the first time in the process;
s6: firstly, removing the upper female die 3, as shown in fig. 4, moving the T-shaped ejector rod 63 upwards, pushing the vertical rod 62 to extend upwards from the vertical groove 611, thereby ejecting the inner female die 41 upwards, and when the ring groove 412 of the inner female die 41 is exposed out of the outer female die 42, matching the snap ring 5 into the ring groove 412, wherein the snap ring 5 restricts the inner female die 41 from descending because the outer diameter of the snap ring 5 is larger than that of the inner female die 41; in an embodiment, a lubricating groove 424 is arranged between the outer concave die 42 and the inner concave die 41, the lubricating groove 424 is formed on the inner wall of the outer concave die 42, and the lubricating groove 424 facilitates lubricating the relative movement between the outer concave die 42 and the inner concave die 41;
s7: then, the T-shaped ejector rod 63 descends and resets to drive the vertical rod 62 to contract and reset, as shown in fig. 5, the male die 1 moves upwards to leave the blank 10, and after the male die 1 completely returns, the lower part of the male die 1 is sleeved with the male die lantern ring 2;
s8: then, as shown in fig. 6 and 7, the new male die structure composed of the male die 1 and the male die collar 2 moves downward to enter the second lower die cavity 411, a downward acting force is continuously applied to the blank 10, the bottom of the blank 10 gradually expands outward, and a second deformation occurs in the first lower die cavity 421; under the condition that the bottom of the blank 10 is gradually filled with the first lower cavity 421 and the male die 1 continuously extrudes the blank 10, the blank 10 of the first lower cavity 421 starts to eject the inner female die 41 upwards, meanwhile, the blank 10 continuously fills the first lower cavity 421, and after the top height of the blank 10 is level, the male die 1 stops descending, and the forming is finished; no excess material is generated in the forming process, and finally, the complete formed blank 10 can be obtained, so that resources are fully utilized, and a good idea of saving energy and materials is kept.
S9: the male die 1 goes upwards and returns, as shown in fig. 8, the inner female die and the snap ring are taken out, and the mandril goes upwards to drive the vertical rod 62 and the top plate 61 to eject the formed blank 10 from the first lower cavity 421;
s10: and finally, closing the die, unscrewing the bolt 9 connected with the outer female die 42 and the lower workbench of the press, unloading the die and taking out the part. In the whole process, the invention only adopts the same group of moulds, thus overcoming the defect of frequent mould replacement.
The height-diameter ratio of the finally formed blank is limited within 2.5, the double-drum shape and the folding defect caused by instability are avoided, the large-size cast rod is continuously subjected to thick upsetting plastic deformation, and a certain foundation is laid for other deformation processes.
One of the characteristics of the invention is that a special forming route is adopted, the bottom is firstly formed and then the whole is formed, the method has the advantages that the blank is formed more fully, the mechanical property is improved by forward expanding and extruding the formed bottom, finally the full part is utilized to perform backward extrusion and integral forming, the blank is ensured to be continuously deformed and filled in the cavity, and finally the blank is enabled to obtain integral large plastic deformation. It can be seen from steps S6 and S9 that the ejector pin mechanism of the present invention plays a key role in the forming process, and not only can push the inner concave die to move upwards through the vertical rod of the ejector pin mechanism when the blank is continuously upset and deformed, but also can leave a space, thereby changing the structure of the cavity, and realizing the flexible change of the cavity structure on the same group of dies, which is unexpected when the traditional ejector pin mechanism is designed; and the basic function of ejecting the blank is kept, namely after the blank is formed, the T-shaped ejector rod pushes the top plate and the vertical rod to eject the blank.
The above description is only a preferred embodiment of the present invention, and is not intended to limit the design of the present invention, and all equivalent changes made in the design key point of the present invention fall within the protection scope of the present invention.
Claims (7)
1. The magnesium alloy cast rod continuous upsetting blank making die is characterized by comprising a male die, a male die lantern ring, an upper female die, a lower female die, a clamping ring and an ejector rod mechanism which are arranged on an upper workbench of a press machine;
the upper female die is coaxially arranged above the lower female die, an upper cavity is formed in the upper female die and used for placing blanks, the male die is coaxially arranged above the upper cavity, and the diameter of the male die is the same as that of the upper cavity;
the lower female die comprises an inner female die and an outer female die fixed on a lower workbench of the press, a first lower cavity is arranged in the outer female die, the inner female die is movably nested in the first lower cavity, a ring groove for clamping a clamping ring is formed in the outer wall of the inner female die, the outer diameter of the clamping ring is larger than that of the inner female die, a second lower cavity is arranged in the inner female die, and the diameter of the second lower cavity is larger than that of the upper cavity;
the male die lantern ring can be sleeved on the outer side of the male die, and the diameter of the sleeved male die is the same as that of the second lower cavity;
the ejector rod mechanism comprises a top plate, a vertical rod and a T-shaped ejector rod, the top plate is supported below the first lower cavity, a vertical groove is formed in the position, corresponding to the inner concave die, of the top plate and supplies the vertical rod to stretch up and down, and the lower end of the vertical rod is connected with the T-shaped ejector rod.
2. The continuous upsetting blank making die for the magnesium alloy cast rod according to claim 1, wherein a limit step is convexly arranged on the outer wall of the male die, the limit step is used for abutting against the top of the male die sleeve ring, and the height of the limit step and the length of the male die sleeve ring are the same as the height of the upper cavity.
3. The continuous upsetting blank making die for the magnesium alloy cast rod according to claim 1, wherein a lubricating groove is arranged between the outer concave die and the inner concave die, and the lubricating groove is formed on the inner wall of the outer concave die.
4. The continuous upsetting blank making die for the magnesium alloy cast rod according to claim 1, further comprising a fastener, wherein the outer female die is provided with a lower flange, an upper flange is arranged at a position of the upper female die corresponding to the lower flange, and fastening holes for the fastener to penetrate are coaxially formed in the upper flange and the lower flange, so that the upper female die is fixed above the outer female die.
5. The continuous upsetting blank die for the magnesium alloy cast rod according to claim 1, wherein a gasket is arranged between the vertical rod and the concave die and fixed at the top of the vertical rod.
6. The continuous upsetting blank making die for the magnesium alloy cast rod according to claim 1, which comprises a punch retainer, wherein the punch retainer is fixed on the upper workbench, a funnel-shaped through hole is formed in the middle of the punch retainer, the top of the punch is funnel-shaped, and the punch is placed into the through hole and is tightly matched with the through hole.
7. The continuous upsetting blank making die for the magnesium alloy cast rod according to claim 1, wherein the die comprises a die fixing plate and a bolt, the die fixing plate is fixed on the lower workbench, the die fixing plate is provided with an inverted T-shaped hole for inserting the bolt, the outer die is placed on the die fixing plate and is provided with a threaded hole at a position corresponding to the inverted T-shaped hole, and the bolt extends out of the inverted T-shaped hole to be matched with the threaded hole of the outer die.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010157110.4A CN111203508B (en) | 2020-03-09 | 2020-03-09 | Continuous upsetting blank making die for magnesium alloy cast rod |
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| CN202010157110.4A CN111203508B (en) | 2020-03-09 | 2020-03-09 | Continuous upsetting blank making die for magnesium alloy cast rod |
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| CN111203508A true CN111203508A (en) | 2020-05-29 |
| CN111203508B CN111203508B (en) | 2021-06-15 |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| CN113967669A (en) * | 2021-12-09 | 2022-01-25 | 中北大学 | Magnesium alloy bar forward extrusion die capable of automatically slowly releasing lubrication |
| CN114589954A (en) * | 2022-03-03 | 2022-06-07 | 山东大学 | Device and method for molding soil triaxial test pieces with various dimensions |
| WO2022267099A1 (en) * | 2021-06-22 | 2022-12-29 | 浙江锐程机械制造有限公司 | Steel bar head upsetting process and steel bar upsetting machine therefor |
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| CN107497984A (en) * | 2017-09-13 | 2017-12-22 | 中北大学 | An a kind of upsetting formation mould of the big specification strand of larger ratio of height to diameter |
| CN109500334A (en) * | 2018-12-29 | 2019-03-22 | 贵州航宇科技发展股份有限公司 | A kind of upset method of larger ratio of height to diameter metal bar material |
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| JPS5719121A (en) * | 1980-07-09 | 1982-02-01 | Mitsubishi Steel Mfg Co Ltd | Forging apparatus of product having a set head |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| 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 |
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| CN113967669A (en) * | 2021-12-09 | 2022-01-25 | 中北大学 | Magnesium alloy bar forward extrusion die capable of automatically slowly releasing lubrication |
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| CN114589954A (en) * | 2022-03-03 | 2022-06-07 | 山东大学 | Device and method for molding soil triaxial test pieces with various dimensions |
| CN114589954B (en) * | 2022-03-03 | 2022-12-13 | 山东大学 | Device and method for molding soil triaxial test pieces with various dimensions |
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