CN212168918U - Double-gate pouring system and die - Google Patents
Double-gate pouring system and die Download PDFInfo
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- CN212168918U CN212168918U CN202020553532.9U CN202020553532U CN212168918U CN 212168918 U CN212168918 U CN 212168918U CN 202020553532 U CN202020553532 U CN 202020553532U CN 212168918 U CN212168918 U CN 212168918U
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Abstract
The utility model discloses a gating system and mould, the gating system includes sprue and first pouring module, first pouring module includes the die cavity, the sprue, the subchannel, and connect the interior of subchannel and chamber and water, the die cavity has relative first side and second side, the subchannel includes first subchannel and second branch runner, water in the interior runner includes and waters in first interior runner and the second, the first side of first subchannel and die cavity is connected simultaneously to first interior runner, water the second side of connecting second branch runner and die cavity simultaneously in the second, water in the first interior runner and be the throat setting in the direction of first branch runner towards the die cavity, water in the second and be the throat setting in the direction of second branch runner towards the die cavity, the utility model discloses technical scheme has improved the shaping quality of foundry goods.
Description
Technical Field
The utility model discloses a two gate gating system and mould specifically are casting moulding technical field.
Background
The most important design in the die-casting forming process is the design of a pouring system, wherein the pouring system generally comprises a sprue, a cross runner, an ingate and the like, and the difference of the pouring system directly influences the factors such as the heat balance, the flow speed stability, the pressure transmission uniformity and the like of molten metal, further influences the filling capacity and the filling stability of the molten metal, and finally influences the overall quality of a casting.
In the existing pouring system, the size of an ingate in the direction of guiding pouring liquid is not changed, so that in the process of pouring molding, the pressure of the pouring liquid flowing into a cavity from the ingate is insufficient, the filling capacity of the whole pouring system is reduced, and the molding quality of a product is seriously influenced.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide a two gate gating system and mould to solve the problem that the product shaping quality that provides is low among the above-mentioned background art.
In order to achieve the above object, the utility model provides a following technical scheme: a dual gate gating system comprising a sprue extending in an up-down direction, the gating system further comprising a first gating module comprising:
a cavity having opposing first and second sides;
one end of the main runner is connected with the lower end of the straight pouring gate, and the other end of the main runner extends towards the lateral direction of the straight pouring gate;
the branch channel comprises a first branch channel and a second branch channel; one end of the first branch flow channel is connected with the free end of the main flow channel, and the other end of the first branch flow channel extends towards the direction far away from the main flow channel and is arranged adjacent to the first side of the cavity; one end of the second sub-runner is connected with the free end of the main runner, and the other end of the second sub-runner extends towards the direction far away from the main runner and is arranged adjacent to the second side of the cavity;
the inner pouring channels comprise a first inner pouring channel and a second inner pouring channel; the first ingate is simultaneously connected with the first branch runner and the first side of the cavity; the second ingate is simultaneously connected with the second branch runner and the second side of the cavity;
the first ingate is arranged in a necking mode in the direction of the first branch flow passage facing the cavity, and the second ingate is arranged in a necking mode in the direction of the second branch flow passage facing the cavity.
Preferably, the first ingate has a first wall surface and a second wall surface extending along the side of the first branch flow channel, the first wall surface and the second wall surface form an acute included angle alpha epsilon [30 DEG, 60 DEG ], the second ingate has a third wall surface and a fourth wall surface extending along the side of the second branch flow channel, the third wall surface and the fourth wall surface form an acute included angle beta [30 DEG, 60 DEG ].
Preferably, the first wall surface and the second wall surface are both curved in an arc surface, and the third wall surface and the fourth wall surface are curved in an arc surface.
Preferably, the flow channel width of the first sub-flow channel gradually decreases in the extending direction of the first sub-flow channel, and the flow channel width of the second sub-flow channel gradually decreases in the extending direction of the second sub-flow channel.
Preferably, the free end of the first branch runner is bent laterally in a direction away from the cavity, and the free end of the second branch runner is bent laterally in a direction away from the cavity.
Preferably, the pouring system further comprises an overflow bag, the overflow bag is connected to one end, far away from the sprue, of the cavity, and the overflow bag is further connected with an exhaust duct extending towards the direction far away from the cavity.
Preferably, the exhaust duct extends in a wave-shaped bent manner.
Preferably, the width of the exhaust passage is gradually enlarged in the extending direction of the exhaust passage.
Preferably, the gating system further comprises a second gating module, the second gating module has the same structure as the first gating module, and the first gating module and the second gating module are symmetrically arranged on two sides of the sprue.
A dual-gate mold, the mold comprising a gating system including a sprue extending in an up-down direction, and a first gating module, the first gating module comprising:
a cavity having opposing first and second sides;
one end of the main runner is connected with the lower end of the straight pouring gate, and the other end of the main runner extends towards the lateral direction of the straight pouring gate;
the branch flow channel comprises a first branch flow channel and a second branch flow channel, one end of the first branch flow channel is connected with the free end of the main flow channel, the other end of the first branch flow channel extends towards the direction far away from the main flow channel and is arranged adjacent to the first side of the cavity, one end of the second branch flow channel is connected with the free end of the main flow channel, and the other end of the second branch flow channel extends towards the direction far away from the main flow channel and is arranged adjacent to the second side of the cavity;
the inner pouring gate comprises a first inner pouring gate and a second inner pouring gate, the first inner pouring gate is simultaneously connected with the first branch flow passage and the first side of the cavity, and the second inner pouring gate is simultaneously connected with the second branch flow passage and the second side of the cavity;
the first ingate is arranged in a necking manner in the direction of the first branch runner towards the cavity, and the second ingate is arranged in a necking manner in the direction of the second branch runner towards the cavity
Compared with the prior art, the beneficial effects of the utility model are that: this device is through adopting the setting of dual-runner to pour into a mould to the both sides of die cavity simultaneously, and then accelerate the injection volume of big casting liquid and filled in order to guarantee that whole die cavity is filled evenly and fully, tentatively improve the shaping quality of foundry goods from this. In addition, the inner pouring channel is arranged in a necking mode, the flow direction pressure of the pouring liquid is increased, the pouring liquid can flow into the cavity from the branch flow channel more smoothly, the whole cavity can be filled with the pouring liquid uniformly, and the molding quality of the casting is improved again.
Drawings
FIG. 1 is a schematic structural diagram of an embodiment of the casting system of the present invention;
FIG. 2 is a bottom view of the runner system of FIG. 1;
FIG. 3 is a top view of the runner system of FIG. 1;
FIG. 4 is a cross-sectional view taken along line A-A of FIG. 3;
FIG. 5 is a schematic view of another perspective of the gating system of FIG. 1;
FIG. 6 is an enlarged view of a portion of FIG. 5 at A;
fig. 7 is a schematic structural diagram of another embodiment of the gating system of the present invention.
In the figure: 100 runner system, 200 sprue, 300 first casting module, 310 cavity, 320 main runner, 330 branch runner, 331 first branch runner, 332 second branch runner, 340 inner runner, 341 first inner runner, 341a first wall surface, 341b second wall surface, 342 second inner runner, 342a third wall surface, 342b fourth wall surface, 350 overflow stream packet, 360 exhaust channel, 370 second casting module.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.
The utility model provides a gating system and include this gating system's mould.
Referring to fig. 1, 2 and 7, the present invention provides a pouring system 100, including a first pouring module 300 and a sprue 200 extending in a vertical direction, the first pouring module 300 includes a cavity 310, a main runner 320, a branch runner 330 and an inner runner 340, the cavity 310 has a first side and a second side opposite to each other, one end of the main runner 320 is connected to a lower end of the sprue 200, the other end of the main runner extends in a lateral direction of the sprue 200, the branch runner 330 includes a first branch runner 331 and a second branch runner 332, one end of the first branch runner 331 is connected to a free end of the main runner 320, the other end of the first branch runner 331 extends in a direction away from the main runner 320 and is disposed at the first side of an adjacent cavity 310, one end of the second branch runner 332 is connected to a free end of the main runner 320, the other end of the second branch runner 332 extends in a direction away from the main runner 320 and is disposed at the second side of the adjacent cavity, the ingate 340 comprises a first ingate 341 and a second ingate 342, the first ingate 341 is connected with the first branch flow passage 331 and the first side of the cavity 310, the second ingate 342 is connected with the second branch flow passage 332 and the second side of the cavity 310, the first ingate 341 is arranged in a way of reducing in the direction of the first branch flow passage 331 towards the cavity 310, and the second ingate 342 is arranged in a way of reducing in the direction of the second branch flow passage 332 towards the cavity 310;
in the present embodiment, the sprue 200 extends vertically, and the lower end of the sprue 200 is connected to a main channel 320, and the main channel 320 extends toward the lateral direction of the sprue 200, and in the following description, the extending end of the main channel 320 is referred to as a free end.
The free end of the main channel 320 is connected to two sub-channels 330, which are a first sub-channel 331 and a second sub-channel 332, in this embodiment, the two sub-channels 330 are disposed like a U, specifically, one end of the two sub-channels 330 is connected to the free end of the main channel 320 at the same time, and after the two sub-channels extend in a direction away from the main channel 320 at a certain angle, the two sub-channels extend in the same direction (for convenience of description, the direction is a first direction), at this time, the latter extending end of the two sub-channels 330 is in a substantially parallel or parallel state, at the same time, a separation region is formed between the first sub-channel 331 and the second sub-channel 332, and a cavity 310 is disposed below the separation region.
The specific shape of the cavity 310 can be set according to different products, in this embodiment, the cavity 310 has a length direction, and the length direction is the same as the first direction, so it can be understood that the cavity 310 has two opposite sides (not upper and lower sides), namely a first side and a second side, in the first direction, and the first side and the second side of the cavity 310 are respectively connected with the first sub-runner 331 and the second sub-runner 332 through the ingates 340 (including the first ingate 341 and the second ingate 342), it should be explained here that the first sub-runner 331 can be located directly above or laterally above the first side of the cavity 310, and similarly, the second sub-runner 332 can be located directly above or laterally above the second side of the cavity 310. Of these, the ingate 340 is connected to the lower side of the runner 330, and secondly, the ingate 340 is connected to the cavity 310 through an ingate.
The gates 340 include a first gate 341 and a second gate 342, and correspondingly, the first sub-runner 331 is connected to a first side of the cavity 310 through the first gate 341, and the second sub-runner 332 is connected to a second side of the cavity 310 through the second gate 342. In order to keep the pouring liquid having a certain pressure and smoothly flowing into the cavity 310 during the pouring process, in this embodiment, the first inner runner 341 and/or the second inner runner 342 are provided in a tapered shape, and a specific tapered direction is a direction of the branch flow channel 330 toward the cavity 310. Specifically explaining the tapering direction, if the first ingate 341 is arranged in a reduced mouth, the tapering direction of the first ingate 341 is the direction of the first branch flow passage 331 toward the first side of the cavity 310, and similarly, if the second ingate 342 is arranged in a reduced mouth, the tapering direction is the direction of the second branch flow passage 332 toward the second side of the cavity 310, it is easy to understand that in order to ensure the production quality and the process requirement of the product, in this embodiment, it is preferable that both the first ingate 341 and the second ingate 342 are arranged in a reduced mouth;
regarding the tapered arrangement of the inner runner 340, the inner runner 340 is mainly explained further by the first inner runner 341, referring to fig. 3 and 4, the inner runner 340 is mainly arranged in a channel shape, and thus, the channel has two ports connecting the first branch flow channel 331 and the first side of the cavity 310 and a plurality of walls forming the channel, in this embodiment, the channel is mainly formed by enclosing four walls, specifically, the four walls include a first wall 341a and a second wall 341b (refer to fig. 4) extending along the side of the first branch flow channel 331 and the other two walls connecting the first wall 341a and the second wall 341 b. Meanwhile, it can be understood that the first wall 341a is disposed at an included angle (acute angle) with the second wall 341b to achieve the taper of the first ingate 341, and the first wall 341a is disposed at an included angle with the second wall 341b, where the first wall 341a is disposed toward the second wall 341b, or the second wall 341b is disposed toward the first wall 341a, and similarly, the second ingate 342 is symmetrically disposed with respect to the first ingate 341, so the second ingate 342 is disposed specifically with reference to the disposing manner of the first ingate 341, and two walls of the second ingate 342 disposed at an included angle are respectively referred to as a third wall 342a and a fourth wall 342b, which is not described herein again. It should be noted that in the embodiment, the number of the wall surfaces is not limited to four, but may be 5, 6, 7, 8 or more. However, regardless of the number of the wall surfaces, for the purpose of realization, the first wall surface 341a and the second wall surface 341b are mainly disposed at an angle in the first ingate 341. The first wall 341a and the second wall 341b are not limited to a planar arrangement, and may be curved;
the utility model discloses technical scheme is through adopting the setting of bi-pass runner 330 to pour into a mould to the both sides of die cavity 310 simultaneously, and then accelerate the injection volume of big pouring liquid to be filled in order to guarantee that whole die cavity 310 is evenly just fully, tentatively improves the shaping quality of foundry goods from this. In addition, the inner pouring gate is arranged in a necking manner, so that the flow direction pressure of the pouring liquid is increased, the pouring liquid can more smoothly flow into the cavity 310 from the branch runner 330, the pouring liquid can be ensured to uniformly fill the whole cavity 310, and the molding quality of the casting is further improved;
on the basis of the above embodiment, the angle α e [30 °, 60 ° ] between the first wall 341a and the second wall 341 b; the angle between third wall 342a and fourth wall 342b is beta e [30 °, 60 ° ]. Specifically, the first wall 341a and the second wall 341b are illustrated for explanation, it is easy to understand that if α is set to be large, the flowing pressure of the casting liquid is insufficient during the casting process, and further residual gas is likely to occur in the cavity 310, so that the casting may generate subcutaneous pores or other defects caused by gas, and the like. Among them, the angle range of α is preferably 30 ° to 60 °, further preferably α ∈ [30 °, 45 ° ], for example, 30 °, 32 °, 35 °, 38 °, 40 °, 43 °, or 45 °, and the like, and most preferably 30 °;
in addition, the angle range of the included angle β between the third wall 342a and the fourth wall 342b may be set specifically with reference to α, and is not described herein again;
in another embodiment, referring to fig. 4 to 6, the first wall 341a and the second wall 341b are curved in an arc, and the third wall 342a and the fourth wall 342b are curved in an arc. In this embodiment, the first wall 341a and the second wall 341b are mainly specifically explained, and the specific arrangement and the obtained advantageous effects of the third wall 342a and the fourth wall 342b can be specifically described in the foregoing embodiment with reference to the former, and specifically, the specific structure of the first wall 341a and the second wall 341b is described in the foregoing embodiment, so it is easy to understand that if the first wall 341a is curved in a curved surface, the extending direction of the curved line is the direction of the first branch flow passage 331 toward the cavity 310, and the concave (or convex) direction of the curved surface may be toward the inside of the first inner runner 341 or toward the outside of the first inner runner 341. In this embodiment, referring to fig. 4 in particular, the first wall 341a is set to face the cavity 310, and thus the second wall 341b is set to face away from the cavity 310, and further, in this embodiment, it is preferable that the second wall 341b is separately provided to be curved in an arc shape and the arc shape is recessed toward the inside of the ingate 340. The structural arrangement aims at guiding the casting liquid by the second wall 341b arranged in the arc surface in the casting process, so that the casting liquid can be injected into the cavity 310 from the first shunt 331 more easily;
similarly, if the first wall 341a is curved in a curved surface, the specific implementation manner may refer to the arrangement manner of the second wall 341 b;
further, it should be noted that, in the present embodiment, the second wall surface 341b is provided to be curved in a curved surface, and the fourth wall surface 342b is also provided to be curved in a curved surface with reference to the manner in which the second wall surface 341b is provided;
in order to prevent the solidification of the casting liquid during the process of the cavity 310 that is not filled due to the lack of the flow force of the casting liquid. Therefore, in another preferred embodiment, referring to fig. 1 and fig. 3, the flow channel width of the first sub flow channel 331 is gradually decreased in the extending direction of the first sub flow channel 331, and the flow channel width of the second sub flow channel 332 is gradually decreased in the extending direction of the second sub flow channel 332. It can be understood that, in the present embodiment, the flow channel widths of the first sub-flow channel 331 and the second sub-flow channel 332 are gradually reduced in the extending direction thereof, so as to increase the flow speed of the casting liquid in the subsequent flowing process, thereby effectively avoiding the above problems;
preferably, in order to ensure that the casting has better molding quality, in this embodiment, the runner widths of the first sub-runner 331 and the second sub-runner 332 are set to gradually decrease in the extending direction of the runner;
with continued reference to fig. 1 and 3, the free end of the first branch flow path 331 is bent laterally away from the cavity 310, and the free end of the second branch flow path 332 is bent laterally away from the cavity 310. Specifically, in order to prevent the backflushing backflow phenomenon after the first sub-runner 331 is filled with the casting liquid, the free end of the first sub-runner 331 is set to be bent laterally away from the cavity 310, so as to avoid the above problem. For the same reason, the embodiment further provides that the free end of the second branch flow passage 332 is bent laterally away from the cavity 310;
in this embodiment, in order to ensure that the casting has better molding quality, it is preferable that the free end of the first sub-runner 331 and the free end of the second sub-runner 332 are both bent laterally in a direction away from the cavity 310;
in another embodiment, referring to fig. 1, the gating system 100 further includes an overflow pack 350, the overflow pack 350 being connected to an end of the cavity 310 away from the sprue 200; moreover, the overflow bag 350 is also connected with an exhaust passage 360 extending towards the direction far away from the cavity 310;
as can be understood, the overflow bag 350 is arranged on the cavity 310, and the exhaust passage 360 is connected to the overflow bag 350, so that the gas in the cavity 310 can be exhausted, and the inside of the cavity 310 can be fully filled; meanwhile, the impurity-containing and feeding effects are achieved, so that the quality of the casting is improved;
further, referring to fig. 1, the exhaust passage 360 extends in a wave-shaped bent manner, and it can be understood that the exhaust passage 360 extends in a wave-shaped bent manner, so that the flow velocity can be slowed down correspondingly after the pouring liquid flows to the exhaust passage 360, the generation of bubbles is reduced, the gas is discharged more sufficiently, and the molding quality of the casting is improved effectively;
wherein, one side of the exhaust passage 360 can be wavy and bent or both sides can be wavy and bent according to different requirements, and certainly, one side of the exhaust passage 360 can be zigzag-shaped and bent or both sides can be zigzag-shaped and bent;
in addition, in order to further enhance the exhaust strength, the width of the exhaust passage 360 may be gradually increased in the extending direction of the exhaust passage 360;
in another preferred embodiment, please refer to fig. 7, the gating system 100 further includes a second gating module 400, the second gating module 400 has the same structure as the first gating module 300, and the first and second gating modules 300 and 400 are symmetrically disposed on two sides of the sprue 200, it can be understood that in order to improve the production efficiency and reasonably utilize the gating capability of the gating system 100, in this embodiment, the casting production is performed simultaneously through the double gating modules, thereby effectively reducing the production cost and enhancing the competitiveness of the product;
it should be explained here that the second casting module 400 in the present embodiment has the same structure as the first casting module 300, and only the case that the structures of the two are completely the same is not separately protected, but it should be noted that when the structures of the two are substantially the same, but there is a small size or structural deviation in the setting process, which also belongs to the protection scope of the present embodiment, and furthermore, according to different casting requirements, the first casting module 300 and the second casting module 400 can be asymmetrically connected to the sprue 200;
in another embodiment, a filter (not shown) is disposed at the upper end of the sprue 200, and is used to primarily clean the casting liquid during the casting process, so as to reduce impurities entering the cavity 310 and improve the molding quality of the casting.
While the invention has been described above with reference to certain embodiments, various modifications may be made and equivalents may be substituted for elements thereof without departing from the scope of the invention. In particular, as long as there is no structural conflict, the various features of the various embodiments disclosed herein can be used in any combination with one another, and the description of such combinations that is not exhaustive in this specification is merely for brevity and resource saving. Therefore, it is intended that the invention not be limited to the particular embodiments disclosed, but that the invention will include all embodiments falling within the scope of the appended claims.
Claims (10)
1. The utility model provides a two gate gating system, is including being the sprue of vertical extension, its characterized in that, the gating system still includes first pouring module, first pouring module includes:
a cavity having opposing first and second sides;
one end of the main runner is connected with the lower end of the straight pouring gate, and the other end of the main runner extends towards the lateral direction of the straight pouring gate;
the branch flow channel comprises a first branch flow channel and a second branch flow channel, one end of the first branch flow channel is connected with the free end of the main flow channel, the other end of the first branch flow channel extends towards the direction far away from the main flow channel and is arranged adjacent to the first side of the cavity, one end of the second branch flow channel is connected with the free end of the main flow channel, and the other end of the second branch flow channel extends towards the direction far away from the main flow channel and is arranged adjacent to the second side of the cavity;
the inner pouring gate comprises a first inner pouring gate and a second inner pouring gate, the first inner pouring gate is simultaneously connected with the first branch flow passage and the first side of the cavity, and the second inner pouring gate is simultaneously connected with the second branch flow passage and the second side of the cavity;
the first ingate is arranged in a necking mode in the direction of the first branch flow passage facing the cavity, and the second ingate is arranged in a necking mode in the direction of the second branch flow passage facing the cavity.
2. A dual gate runner system as defined in claim 1 wherein: the first ingate is provided with a first wall surface and a second wall surface which extend along the side edge of the first branch runner, the first wall surface and the second wall surface form an included acute angle which is formed by an angle alpha belonging to [30 degrees ] and 60 degrees ], the second ingate is provided with a third wall surface and a fourth wall surface which extend along the side edge of the second branch runner, the third wall surface and the fourth wall surface form an included acute angle which is formed by an angle beta belonging to [30 degrees ] and 60 degrees ].
3. A dual gate runner system as defined in claim 2 wherein: the first wall surface and the second wall surface are both curved in an arc surface, and the third wall surface and the fourth wall surface are curved in an arc surface.
4. A dual gate runner system as defined in claim 1 wherein: the flow channel width of the first sub-flow channel is gradually reduced in the extending direction of the first sub-flow channel, and the flow channel width of the second sub-flow channel is gradually reduced in the extending direction of the second sub-flow channel.
5. A dual gate runner system as defined in claim 1 wherein: the free end of the first branch runner is laterally bent in the direction away from the cavity, and the free end of the second branch runner is laterally bent in the direction away from the cavity.
6. A dual gate runner system as defined in claim 1 wherein: the pouring system further comprises an overflow bag, the overflow bag is connected to one end, far away from the sprue, of the cavity, and an exhaust passage extending towards the direction far away from the cavity is further connected to the overflow bag.
7. A dual gate runner system as defined in claim 6 wherein: the exhaust passage extends in a wave bending way.
8. A dual gate runner system as defined in claim 6 wherein: the width of the exhaust passage is gradually enlarged in the extending direction of the exhaust passage.
9. A dual gate runner system as defined in claim 6 wherein: the pouring system further comprises a second pouring module, the second pouring module and the first pouring module are identical in structure, and the first pouring module and the second pouring module are symmetrically arranged on two sides of the sprue.
10. A dual gate mold comprising the dual gate runner system of any one of claims 1 to 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020553532.9U CN212168918U (en) | 2020-04-15 | 2020-04-15 | Double-gate pouring system and die |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020553532.9U CN212168918U (en) | 2020-04-15 | 2020-04-15 | Double-gate pouring system and die |
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| Publication Number | Publication Date |
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| CN212168918U true CN212168918U (en) | 2020-12-18 |
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| CN202020553532.9U Expired - Fee Related CN212168918U (en) | 2020-04-15 | 2020-04-15 | Double-gate pouring system and die |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116809892A (en) * | 2023-07-20 | 2023-09-29 | 宁波星源卓镁技术股份有限公司 | Magnesium alloy die casting die |
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2020
- 2020-04-15 CN CN202020553532.9U patent/CN212168918U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116809892A (en) * | 2023-07-20 | 2023-09-29 | 宁波星源卓镁技术股份有限公司 | Magnesium alloy die casting die |
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Granted publication date: 20201218 |