CN116274938A - Die-casting forming system of metal piece - Google Patents
Die-casting forming system of metal piece Download PDFInfo
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- CN116274938A CN116274938A CN202211097454.6A CN202211097454A CN116274938A CN 116274938 A CN116274938 A CN 116274938A CN 202211097454 A CN202211097454 A CN 202211097454A CN 116274938 A CN116274938 A CN 116274938A
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- 239000002184 metal Substances 0.000 title claims abstract description 30
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- 239000000463 material Substances 0.000 claims description 3
- 239000007788 liquid Substances 0.000 abstract description 11
- 238000000465 moulding Methods 0.000 abstract description 6
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- 238000005520 cutting process Methods 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
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Images
Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D17/00—Pressure die casting or injection die casting, i.e. casting in which the metal is forced into a mould under high pressure
- B22D17/20—Accessories: Details
- B22D17/22—Dies; Die plates; Die supports; Cooling equipment for dies; Accessories for loosening and ejecting castings from dies
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D17/00—Pressure die casting or injection die casting, i.e. casting in which the metal is forced into a mould under high pressure
- B22D17/20—Accessories: Details
- B22D17/22—Dies; Die plates; Die supports; Cooling equipment for dies; Accessories for loosening and ejecting castings from dies
- B22D17/2272—Sprue channels
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Molds, Cores, And Manufacturing Methods Thereof (AREA)
- Moulds For Moulding Plastics Or The Like (AREA)
Abstract
The invention discloses a die-casting molding system of a metal piece, which comprises an upper die with a cavity, a lower die with a core, a split cone connected to one end of the lower die and a sprue bush connected with the split cone, wherein an opening at the upper end of the sprue bush is connected with a die-casting machine, the lower end of the sprue bush is in through connection with the split cone, the lower surface of the lower die is fixedly connected with a first cap body, the lower end of a first movable column is embedded into the first cap body, an elastic component is sleeved on the first movable column and is positioned between the lower surface of a first flange part and the first cap body, and the elastic component is formed by staggered superposition of a plurality of elastic sheets. The invention can solve the problem of forming defects of the front end of the part caused by insufficient pressure due to too far distance from the die casting liquid inlet, and the like, and further improves the quality of the formed part.
Description
Technical Field
The invention relates to the technical field of die casting, in particular to a die casting molding system of a metal piece.
Background
The die casting machine is a series of industrial casting machines for obtaining solid metal castings by hydraulically injecting molten metal into a die casting mold under the action of pressure for cooling and molding and opening the mold. The die casting is one of advanced metal forming methods, and in the field of modern metal forming processes, an effective path with little metal and no cutting is realized, and the die casting metal part is close to the final shape and size requirement, so that the die casting method has incomparable and unique superiority in the aspect of mass production of precision castings with complex structures. The die casting die is provided with a die cavity, a plurality of filling flow passages of molten metal are distributed in the die cavity, and the tail ends of the filling flow passages are connected with a centralized exhaust passage.
In terms of technology, die casting, like other manufacturing methods, has some drawbacks: during die casting, molten metal fills a die cavity in a high-speed injection state, the flow state is unstable, most of gas in the die cavity is not discharged, and then the gas is inevitably involved into the molten metal and finally remains in a casting in a pore form, and some oxide inclusions exist, so that the defects of poor mechanical properties and the like of the die casting are caused.
Disclosure of Invention
The invention mainly aims to provide a die-casting molding system for metal parts, which can effectively solve the problems in the background technology.
In order to achieve the above purpose, the invention adopts the following technical scheme: the die-casting forming system of the metal piece comprises an upper die with a cavity, a lower die with a core, a split cone connected to one end of the lower die and a sprue bush connected with the split cone, wherein an opening at the upper end of the sprue bush is connected with a material injection structure of a die-casting machine, the lower end of the sprue bush is in through connection with the split cone, a first runner groove is arranged on the upper surface of the lower die and between the core and the split cone, and the first runner groove is communicated with a gap formed between the cavity and the core;
the upper surface center of the core is provided with a concave part, the core is also provided with a first through hole communicated with the concave part, a first movable column capable of moving up and down in the first through hole is arranged in the first through hole, the upper surface of the first movable column is flush with the bottom surface of the concave part, the lower part of the first movable column is provided with a first flange part arranged along the circumferential direction, the lower surface of the lower die is fixedly connected with a first cap body, the lower end of the first movable column is embedded into the first cap body, an elastic component is sleeved on the first movable column and is positioned between the lower surface of the first flange part and the first cap body, and the elastic component is formed by staggered superposition of a plurality of elastic sheets;
the upper surface of the core and one side of the core, which is opposite to the flow dividing cone, is provided with a second flow channel, the second flow channel is in through connection with a gap formed between the cavity and the core, the lower die is provided with a second through hole which is communicated with the second flow channel, a second movable column which can move up and down in the second through hole is arranged in the second through hole, the top surface of the second movable column is flush with the bottom surface of the second flow channel, the lower part of the second movable column is provided with a second flange part which is arranged along the circumferential direction, the lower surface of the lower die is fixedly connected with a second cap body, the lower end of the second movable column is embedded into the second cap body, and a second elastic assembly is sleeved on the second movable column and is positioned between the lower surface of the second flange part and the second cap body;
the middle part of the upper surface of the shunt cone is provided with a shunt groove, the upper surface of the shunt cone is also provided with a diversion groove for communicating the shunt groove with the first flow channel, the shunt cone is also provided with a third through hole communicated with the shunt groove, a third movable column capable of moving up and down in the third through hole is arranged in the third through hole, the top surface of the third movable column is flush with the bottom surface of the shunt groove, the lower part of the third movable column is provided with a third flange part arranged along the circumferential direction, the lower surface of the shunt cone is fixedly connected with a third cap body, the lower end of the third movable column is embedded into the third cap body, and a third elastic component is sleeved on the third movable column and is positioned between the lower surface of the third flange part and the third cap body.
The further improved scheme in the technical scheme is as follows:
1. in the above scheme, at least two corners of the upper surface of the lower die are provided with a bump.
2. In the above scheme, a plurality of grooves corresponding to the convex blocks are formed in the lower surface of the upper die.
Due to the application of the technical scheme, compared with the prior art, the invention has the following advantages:
1. the die-casting forming system of the metal part can provide a buffer zone of pressure when die-casting liquid enters a die through the arrangement of the movable column and the elastic component, so that reverse pressure is given to the part in the part forming process, continuous pressure is provided for a part area with a thicker part, and the problem that the speed, effect and precision of forming are affected because the part area with the thicker part is not pressurized due to the fact that the pressure applied by the outside cannot be applied to the part area with the thicker part after the part area with the thicker part is formed is avoided.
2. The die-casting forming system of the metal piece comprises a die-casting forming system, wherein the die-casting forming system is characterized in that a second flow channel is formed on the upper surface of a die core and is positioned on one side of the die core opposite to a flow splitting cone, the second flow channel is connected with a cavity in a penetrating way, and gaps formed between the die cavity and the die core are formed; in addition, a second through hole communicated with the second runner groove is formed in the lower die, a second movable column capable of moving up and down in the second through hole is arranged in the second through hole, the top surface of the second movable column is flush with the bottom surface of the second runner groove, a second flange part arranged along the circumferential direction is arranged at the lower part of the second movable column, a second cap body is fixedly connected to the lower surface of the lower die, the lower end of the second movable column is embedded into the second cap body, a second elastic component is sleeved on the second movable column and is arranged between the lower surface of the second flange part and the second cap body, a buffer area of pressure can be provided when die casting liquid enters the die through the arrangement of the second movable column and the second elastic component, and then the part is given reverse pressure in the part forming process, so that the problems of forming defects of the front end of the part caused by insufficient pressure due to too far distance from a die casting liquid inlet at the front end of the part are overcome, and the like are further improved.
3. The invention relates to a die-casting forming system of a metal piece, which is characterized in that a third through hole communicated with a flow dividing groove is further formed in a flow dividing cone, a third movable column capable of moving up and down in the third through hole is arranged in the third through hole, the top surface of the third movable column is flush with the bottom surface of the flow dividing groove, a third flange part arranged along the circumferential direction is arranged at the lower part of the third movable column, a third cap body is fixedly connected to the lower surface of the flow dividing cone, the lower end of the third movable column is embedded into the third cap body, a third elastic component is sleeved on the third movable column and is positioned between the lower surface of the third flange part and the third cap body, and the pressure of die-casting liquid entering the flow dividing cone can be monitored through the deformation of the third movable column and the third elastic component, so that the problem of die cracking and failure caused by overlarge pressure when the die-casting liquid enters a die is avoided, and the service life of the die is prolonged.
Drawings
FIG. 1 is a schematic diagram of a die casting system for metal parts according to the present invention;
FIG. 2 is a schematic exploded view of a die casting system for metal parts according to the present invention;
FIG. 3 is a schematic diagram showing a die-casting system for metal parts according to the second embodiment of the present invention;
FIG. 4 is a cross-sectional view of a die casting system for metal pieces of the present invention;
FIG. 5 is a cross-sectional view of a partial structure of the die casting system of the present invention in an unstressed state of the metal part;
fig. 6 is a sectional view of a partial structure of a die casting system for a metal part according to the present invention in a stressed state.
In the above figures: 1. a cavity; 2. an upper die; 3. a core; 4. a lower die; 5. a split cone; 501. a shunt channel; 502. a diversion trench; 6. a sprue bush; 7. a first flow channel; 8. a recessed portion; 9. a first through hole; 10. a first movable column; 11. a first flange portion; 12. a first cap body; 13. an elastic component; 14. a second flow channel; 15. a second through hole; 16. a second movable column; 17. a second flange portion; 18. a second cap body; 19. a second elastic component; 21. a third through hole; 22. a third movable column; 23. a third flange portion; 24. a third cap body; 25. a third elastic component; 26. a bump; 27. a groove.
Detailed Description
In the description of this patent, it should be noted that, directions or positional relationships indicated by terms such as "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., are based on directions or positional relationships shown in the drawings, are merely for convenience of description and simplification of description, and do not indicate or imply that the apparatus or element in question must have a specific direction, be configured and operated in a specific direction, and thus should not be construed as limiting the invention; the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance; furthermore, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in this patent will be understood by those of ordinary skill in the art in a specific context.
Example 1: the die-casting molding system of the metal piece comprises an upper die 2 with a cavity 1, a lower die 4 with a core 3, a flow dividing cone 5 connected to one end of the lower die 4 and a sprue bush 6 connected with the flow dividing cone 5, wherein an opening at the upper end of the sprue bush 6 is connected with a die-casting machine, the lower end of the sprue bush 6 is in through connection with the flow dividing cone 5, a first runner groove 7 is arranged on the upper surface of the lower die 4 and positioned between the core 3 and the flow dividing cone 5, and the first runner groove 7 is communicated with a gap formed between the cavity 1 and the core 3;
the center of the upper surface of the core 3 is provided with a concave part 8, the core 3 is also provided with a first through hole 9 communicated with the concave part 8, a first movable column 10 capable of moving up and down in the first through hole 9 is arranged in the first through hole 9, the upper surface of the first movable column 10 is flush with the bottom surface of the concave part 8, the lower part of the first movable column 10 is provided with a first flange part 11 arranged along the circumferential direction, the lower surface of the lower die 4 is fixedly connected with a first cap body 12, the lower end of the first movable column 10 is embedded into the first cap body 12, and an elastic component 13 is sleeved on the first movable column 10 and is positioned between the lower surface of the first flange part 11 and the first cap body 12;
a second runner groove 14 is formed on the upper surface of the core 3 and is positioned on one side of the core 3 opposite to the split cone 5, the second runner groove 14 is in through connection with a gap formed between the cavity 1 and the core 3, a second through hole 15 which is communicated with the second runner groove 14 is formed on the lower die 4, a second movable column 16 which can move up and down in the second through hole 15 is arranged in the second through hole 15, the top surface of the second movable column 16 is flush with the bottom surface of the second runner groove 14, a second flange part 17 which is arranged along the circumferential direction is arranged at the lower part of the second movable column 16, a second cap 18 is fixedly connected on the lower surface of the lower die 4, the lower end of the second movable column 16 is embedded into the second cap 18, and a second elastic component 19 is sleeved on the second movable column 16 and is positioned between the lower surface of the second flange part 17 and the second cap 18;
the middle part of the upper surface of the diversion cone 5 is provided with a diversion groove 501, the upper surface of the diversion cone 5 is also provided with a diversion groove 502 for communicating the diversion groove 501 with the first flow channel 7, the diversion cone 5 is also provided with a third through hole 21 communicated with the diversion groove 501, a third movable column 22 capable of moving up and down in the third through hole 21 is arranged in the third through hole 21, the top surface of the third movable column 22 is flush with the bottom surface of the diversion groove 501, the lower part of the third movable column 22 is provided with a third flange part 23 arranged along the circumferential direction, the lower surface of the diversion cone 5 is fixedly connected with a third cap body 24, the lower end of the third movable column 22 is embedded into the third cap body 24, and a third elastic component 25 is sleeved on the third movable column 22 and is positioned between the lower surface of the third flange part 23 and the third cap body 24.
The elastic component 13 is a spring; at least two corners of the upper surface of the lower die 4 are provided with a convex block 26, and the lower surface of the upper die 2 is provided with a plurality of grooves 27 corresponding to the convex blocks 26; the number of the protruding blocks 26 and the grooves 27 is four, and the protruding blocks and the grooves are respectively positioned at four corners of the lower die 4 and the upper die 2.
Example 2: the die-casting molding system of the metal piece comprises an upper die 2 with a cavity 1, a lower die 4 with a core 3, a flow dividing cone 5 connected to one end of the lower die 4 and a sprue bush 6 connected with the flow dividing cone 5, wherein an opening at the upper end of the sprue bush 6 is connected with a die-casting machine, the lower end of the sprue bush 6 is in through connection with the flow dividing cone 5, a first runner groove 7 is arranged on the upper surface of the lower die 4 and positioned between the core 3 and the flow dividing cone 5, and the first runner groove 7 is communicated with a gap formed between the cavity 1 and the core 3;
the center of the upper surface of the core 3 is provided with a concave part 8, the core 3 is also provided with a first through hole 9 communicated with the concave part 8, a first movable column 10 capable of moving up and down in the first through hole 9 is arranged in the first through hole 9, the upper surface of the first movable column 10 is flush with the bottom surface of the concave part 8, the lower part of the first movable column 10 is provided with a first flange part 11 arranged along the circumferential direction, the lower surface of the lower die 4 is fixedly connected with a first cap body 12, the lower end of the first movable column 10 is embedded into the first cap body 12, and an elastic component 13 is sleeved on the first movable column 10 and is positioned between the lower surface of the first flange part 11 and the first cap body 12;
a second runner groove 14 is formed on the upper surface of the core 3 and is positioned on one side of the core 3 opposite to the split cone 5, the second runner groove 14 is in through connection with a gap formed between the cavity 1 and the core 3, a second through hole 15 which is communicated with the second runner groove 14 is formed on the lower die 4, a second movable column 16 which can move up and down in the second through hole 15 is arranged in the second through hole 15, the top surface of the second movable column 16 is flush with the bottom surface of the second runner groove 14, a second flange part 17 which is arranged along the circumferential direction is arranged at the lower part of the second movable column 16, a second cap 18 is fixedly connected on the lower surface of the lower die 4, the lower end of the second movable column 16 is embedded into the second cap 18, and a second elastic component 19 is sleeved on the second movable column 16 and is positioned between the lower surface of the second flange part 17 and the second cap 18;
the middle part of the upper surface of the diversion cone 5 is provided with a diversion groove 501, the upper surface of the diversion cone 5 is also provided with a diversion groove 502 for communicating the diversion groove 501 with the first flow channel 7, the diversion cone 5 is also provided with a third through hole 21 communicated with the diversion groove 501, a third movable column 22 capable of moving up and down in the third through hole 21 is arranged in the third through hole 21, the top surface of the third movable column 22 is flush with the bottom surface of the diversion groove 501, the lower part of the third movable column 22 is provided with a third flange part 23 arranged along the circumferential direction, the lower surface of the diversion cone 5 is fixedly connected with a third cap body 24, the lower end of the third movable column 22 is embedded into the third cap body 24, and a third elastic component 25 is sleeved on the third movable column 22 and is positioned between the lower surface of the third flange part 23 and the third cap body 24.
The elastic component 13 is formed by overlapping a plurality of elastic sheets in a staggered way; the upper end opening of the sprue bush 6 is connected with a material injection structure of the die casting machine.
When the die-casting forming system of the metal piece is adopted, through the arrangement of the movable column and the elastic component, a buffer zone of pressure can be provided when die-casting liquid enters the die, so that reverse pressure is provided for the part in the part forming process, continuous pressure is provided for a part area with a thicker part, and the problem that the speed, the effect and the precision of forming are affected because the part area with the thicker part is not provided with pressure due to the fact that the part area with the thicker part is firstly formed and then externally applied pressure cannot be applied is avoided;
in addition, the second flow channel is provided with a forming buffer space, so that the balance and stability of pressure are ensured, and meanwhile, gas and oxide inclusions which are not discharged into molten metal in a cavity can be finally removed in the second flow channel to form a slag ladle, so that gas and oxide impurities are prevented from remaining in a formed part to form air holes, defects and the like, and the quality of the formed part is ensured;
in addition, through the arrangement of the second movable column and the second elastic component, a buffer zone of pressure can be provided when die casting liquid enters the die, so that reverse pressure is given to the part in the part forming process, the problems of forming defects of the front end of the part and the like caused by insufficient pressure due to too far distance from a die casting liquid inlet are solved, and the quality of the part after forming is further improved;
in addition, through the setting of third movable column and third elastic component, can monitor the pressure of the die casting liquid in the entering diverging cone through elastic component's deformation volume to avoid leading to the problem of mould fracture inefficacy because of the too big pressure when die casting liquid gets into the mould, extension mould's life.
The above embodiments are provided to illustrate the technical concept and features of the present invention and are intended to enable those skilled in the art to understand the content of the present invention and implement the same, and are not intended to limit the scope of the present invention. All equivalent changes or modifications made in accordance with the spirit of the present invention should be construed to be included in the scope of the present invention.
Claims (3)
1. A die casting system for a metal part, comprising: the die comprises an upper die (2) with a die cavity (1), a lower die (4) with a core (3), a flow distribution cone (5) connected to one end of the lower die (4) and a sprue bush (6) connected with the flow distribution cone (5), wherein the opening of the upper end of the sprue bush (6) is connected with a material injection structure of a die casting machine, the lower end of the sprue bush (6) is in through connection with the flow distribution cone (5), a first runner groove (7) is formed on the upper surface of the lower die (4) and between the core (3) and the flow distribution cone (5), and the first runner groove (7) is communicated with a gap formed between the die cavity (1) and the core (3);
the core (3) is provided with a concave part (8) at the center of the upper surface, the core (3) is also provided with a first through hole (9) communicated with the concave part (8), a first movable column (10) capable of moving up and down in the first through hole (9) is arranged in the first through hole (9), the upper surface of the first movable column (10) is flush with the bottom surface of the concave part (8), the lower part of the first movable column (10) is provided with a first flange part (11) arranged along the circumferential direction, the lower surface of the lower die (4) is fixedly connected with a first cap body (12), the lower end of the first movable column (10) is embedded into the first cap body (12), an elastic component (13) is sleeved on the first movable column (10) and is positioned between the lower surface of the first flange part (11) and the first cap body (12), and the elastic component (13) is formed by overlapping a plurality of elastic sheets;
a second runner groove (14) is formed in the upper surface of the core (3) and is positioned on one side of the core (3) opposite to the split cone (5), the second runner groove (14) is in through connection with the cavity (1) and a gap formed between the core (3), a second through hole (15) which is communicated with the second runner groove (14) is formed in the lower die (4), a second movable column (16) which can move up and down in the second through hole (15) is arranged in the second through hole (15), the top surface of the second movable column (16) is flush with the bottom surface of the second runner groove (14), a second flange part (17) which is arranged along the circumferential direction is arranged at the lower part of the second movable column (16), a second cap body (18) is fixedly connected to the lower surface of the lower die (4), and the lower end of the second movable column (16) is embedded into the second cap body (18), and a second elastic component (19) is sleeved on the second movable column (16) and is positioned between the second flange part (17) and the second cap body (18);
the middle part of the upper surface of the shunt cone (5) is provided with a shunt groove (501), the upper surface of the shunt cone (5) is also provided with a guide groove (502) used for communicating the shunt groove (501) with the first flow channel groove (7), the shunt cone (5) is also provided with a third through hole (21) communicated with the shunt groove (501), a third movable column (22) capable of moving up and down in the third through hole (21) is arranged in the third through hole (21), the top surface of the third movable column (22) is flush with the bottom surface of the shunt groove (501), the lower part of the third movable column (22) is provided with a third flange part (23) arranged along the circumferential direction, the lower surface of the shunt cone (5) is fixedly connected with a third cap body (24), the lower end of the third movable column (22) is embedded into the third cap body (24), and a third elastic component (25) is sleeved on the third movable column (22) and is positioned between the lower surface of the third flange part (23) and the third cap body (24).
2. The die casting system for metal pieces according to claim 1, wherein: at least two corners of the upper surface of the lower die (4) are provided with a lug (26).
3. The die casting system for metal pieces according to claim 2, wherein: the lower surface of the upper die (2) is provided with a plurality of grooves (27) corresponding to the convex blocks (26).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211097454.6A CN116274938A (en) | 2019-12-31 | 2019-12-31 | Die-casting forming system of metal piece |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211097454.6A CN116274938A (en) | 2019-12-31 | 2019-12-31 | Die-casting forming system of metal piece |
| CN201911408996.9A CN113118412B (en) | 2019-12-31 | 2019-12-31 | Forming device for metal piece |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201911408996.9A Division CN113118412B (en) | 2019-12-31 | 2019-12-31 | Forming device for metal piece |
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| CN116274938A true CN116274938A (en) | 2023-06-23 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201911408996.9A Active CN113118412B (en) | 2019-12-31 | 2019-12-31 | Forming device for metal piece |
| CN202211097454.6A Pending CN116274938A (en) | 2019-12-31 | 2019-12-31 | Die-casting forming system of metal piece |
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| CN201911408996.9A Active CN113118412B (en) | 2019-12-31 | 2019-12-31 | Forming device for metal piece |
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| CN113714483A (en) * | 2021-08-26 | 2021-11-30 | 东莞市鸿威精密五金制品有限公司 | Die casting die of quick die change |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| JPS56102365A (en) * | 1980-01-21 | 1981-08-15 | Honda Motor Co Ltd | Method of filling molten metal in vertical type die casting machine |
| JP2731557B2 (en) * | 1988-11-22 | 1998-03-25 | 東芝機械株式会社 | Squeeze plunger operation method in die casting machine |
| CH689156A5 (en) * | 1994-06-01 | 1998-11-13 | Buehler Ag | Diecasting. |
| US6926065B2 (en) * | 2003-09-24 | 2005-08-09 | Michael Garin | Casting solidification expansion materials |
| CN101530902B (en) * | 2009-04-16 | 2010-12-08 | 宁海县德科模塑有限公司 | Stable-pressure device of Zinc alloy die casting mold |
| CN104162642B (en) * | 2013-05-17 | 2016-06-29 | 贵州大学 | A kind of casting forming flexibility feeding elasticity device for exerting |
| CN203621469U (en) * | 2013-12-03 | 2014-06-04 | 宁波市北仑燎原模铸有限公司 | Novel local pressurizing structure |
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| CN113118412A (en) | 2021-07-16 |
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