CN113400592B - Mould with turnover runner - Google Patents
Mould with turnover runner Download PDFInfo
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- CN113400592B CN113400592B CN202110675681.1A CN202110675681A CN113400592B CN 113400592 B CN113400592 B CN 113400592B CN 202110675681 A CN202110675681 A CN 202110675681A CN 113400592 B CN113400592 B CN 113400592B
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- runner
- flow channel
- mold
- flow
- die core
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- 230000007306 turnover Effects 0.000 title claims abstract description 22
- 239000012530 fluid Substances 0.000 claims abstract description 4
- 238000000465 moulding Methods 0.000 claims description 3
- 229920003023 plastic Polymers 0.000 abstract description 32
- 239000004033 plastic Substances 0.000 abstract description 32
- 230000008014 freezing Effects 0.000 abstract description 10
- 238000007710 freezing Methods 0.000 abstract description 10
- 238000010008 shearing Methods 0.000 abstract description 9
- 238000002347 injection Methods 0.000 abstract description 5
- 239000007924 injection Substances 0.000 abstract description 5
- 108091006146 Channels Proteins 0.000 description 56
- 230000000694 effects Effects 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 238000005266 casting Methods 0.000 description 2
- 238000010924 continuous production Methods 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 238000001746 injection moulding Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Images
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
- B29C45/17—Component parts, details or accessories; Auxiliary operations
- B29C45/26—Moulds
- B29C45/27—Sprue channels ; Runner channels or runner nozzles
- B29C45/2725—Manifolds
Landscapes
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Mechanical Engineering (AREA)
- Moulds For Moulding Plastics Or The Like (AREA)
Abstract
The application proposes a mould with upset runner, the mould includes: the upper die core is provided with a pouring gate and a second runner; the lower die core is provided with a first runner, a third runner and a fourth runner; in the assembly state of the upper die core and the lower die core, the pouring opening is sequentially connected with the first flow passage, the second flow passage and the third flow passage to form a turnover flow passage for guiding pouring fluid from the pouring opening to the forming cavity; in the structure of the turnover flow channel, the second flow channel is arranged in a ring shape and is intersected with the two ends of the first flow channel, and the turnover flow channel comprises a part with a semicircular cross section. By adopting the technical scheme, the freezing layer is uniformly established through the turnover runner, and the flow shearing balance is achieved or made as much as possible when molten plastic is injected into the product cavity, so that the quality problem of the injection molded product can be avoided or reduced.
Description
Technical Field
The application belongs to the injection mold field, in particular to a mold with a turnover runner.
Background
When molten plastic flows in the runner casting system, the plastic and the inner wall of the runner are sheared so as to build a freezing layer, and the part which is used for preferentially building the freezing layer flows preferentially.
Based on the flow shear balancing effect, molten plastic tends to flow toward the side that first contacts the inner walls of the runners as it turns around in the runners, thus resulting in unbalanced shear flow of the plastic in the multi-cavity mold, ultimately leading to frequent quality problems. So how to solve the problem of shearing unbalance in the runner is an important subject in the injection mold industry.
In the prior art, a round overturning runner design is adopted and only aims at two-plate mold runners, the design can enable two-plate mold products to flow more evenly, the turning effect of a plastic runner can be finally eliminated through overturning of a runner pouring system, and flow shearing balance is achieved when the front edge of plastic flow is injected into a product forming cavity. The existing turnover runner casting system at present can only be applied to conventional two-plate molds due to the limitation of round (full) runner design, and the problem of unbalanced shearing flow of plastics in three-plate molds needs to be solved.
Disclosure of Invention
The present application aims to propose a mould with a turned runner to achieve or maximize flow shear balance when molten plastic is injected into a product forming cavity.
The application proposes a mould with upset runner, mould with upset runner includes:
the upper die core is provided with a pouring gate and a second runner; and
the lower die core is provided with a first runner, a third runner and a fourth runner;
in the assembly state of the upper die core and the lower die core, the pouring opening is sequentially connected with the first flow passage, the second flow passage and the third flow passage to form a turnover flow passage for guiding pouring fluid from the pouring opening to the forming cavity;
in the structure of the turnover flow channel, the second flow channel is arranged in a ring shape and is intersected with the two ends of the first flow channel,
the flip flow channel includes a portion having a semicircular cross section.
Preferably, the mold with the turnover runner is a three-plate mold.
Preferably, the turnover runner includes an arc-shaped inner wall facing the upper mold core and an arc-shaped inner wall facing the lower mold core.
Preferably, one end of the third flow passage intersects the second flow passage, and the third flow passage extends radially outward of the second flow passage from the second flow passage.
Preferably, the third flow passage is provided as at least one.
Preferably, the fourth runner extends along the thickness direction of the lower die core and intersects with the third runner, and the fourth runner is connected to a forming cavity for forming a product.
Preferably, the cross sections of the first flow channel, the second flow channel and the third flow channel are semicircular, and the directions of the arc surfaces of the cross sections of the first flow channel and the third flow channel are opposite to those of the arc surfaces of the cross section of the second flow channel.
Preferably, the third flow passage extends to an annular side wall of the second flow passage adjacent to the radially inner side.
Preferably, the planar portion of the first flow passage and the planar portion of the second flow passage intersect relatively, and the planar portion of the second flow passage and the planar portion of the third flow passage intersect relatively.
Preferably, two third flow passages are provided, and the two third flow passages are arranged at two sides of the first flow passage.
By adopting the technical scheme, the freezing layer is uniformly established through the overturning runner of the runner with a semicircular cross-section structure in the injection molding process of the three-plate mold, and the flow shearing balance is achieved or made as much as possible when molten plastic is injected into the product molding cavity, so that the quality problem of the injection molded product can be avoided or reduced.
Drawings
Fig. 1 shows a schematic structural view of an upper core of a mold having a reverse runner according to an embodiment of the present application.
Fig. 2 shows a perspective view of a lower core of a mold having a turn runner and a turn runner according to an embodiment of the present application.
Fig. 3 illustrates a runner face elevation of a lower core of a mold having a flip runner according to an embodiment of the present application.
Fig. 4 is a schematic structural view of a turning runner of a mold having a turning runner according to an embodiment of the present application.
Fig. 5 shows a schematic structural view of another angle of the inversion runner of the mold having the inversion runner according to the embodiment of the present application.
Fig. 6 shows a layered schematic of the flow of molten plastic within a runner.
Description of the reference numerals
1. Upper die core 2 and lower die core
100. The first runner 102, the second runner 103 and the third runner of the sprue gate 101
104. Fourth runner 106 cold material well
3. Inner wall of flow channel
4. Frozen layer
5. Flow front
6. Shear layer
7. Thermal layer
X thickness direction.
Detailed Description
To more clearly illustrate the above objects, features and advantages of the present application, specific embodiments of the present application are described in detail in this section in conjunction with the accompanying drawings. The present application can be embodied in other different forms besides the embodiments described in this section, and those skilled in the art may make corresponding modifications, variations, and substitutions without departing from the spirit of the application, so that the application is not limited to the specific examples disclosed in this section. The protection scope of the present application shall be subject to the claims.
As shown in fig. 1 to 5, the present application proposes a mold having a turnover runner (hereinafter, sometimes simply referred to as a mold), which may be a three-plate mold. It can be understood that in the mold of the three-plate mold, unlike the two-plate mold, the ejection mechanism for separating the upper mold core 1 from the lower mold core 2 is not provided, so that the overturning runner is required to satisfy the thermal shearing balance, avoid the quality problem of the manufactured product, and facilitate the demolding of the structure of the overturning runner.
The mold with the turnover runner comprises an upper mold core 1 and a lower mold core 2, wherein the upper mold core 1 is provided with a pouring gate 100 and a second runner 102, and the lower mold core 2 is provided with a first runner 101, a third runner 103 and a fourth runner 104. In a state that the upper die core 1 and the lower die core 2 are buckled together, the pouring opening 100 is sequentially connected with the first flow channel 101, the second flow channel 102 and the third flow channel 103 to form a turnover flow channel for guiding pouring fluid from the pouring opening 100 to the forming cavity. The turnover runner can be communicated with the forming cavity, and molten plastic can be poured into the forming cavity through the turnover runner, so that a corresponding product is formed after the plastic is solidified. The flip flow channel includes a portion of the recess that is semi-circular in cross-section.
It is understood that the semicircular recess includes a substantially semicircular shape, such as a semi-elliptical shape or a semi-circular shape consisting of an arc and a straight line, etc.
The complete shape of the inversion flow channel is difficult to directly express, but the shape formed after the melted plastic fills the inversion flow channel is identical to the shape of the inversion flow channel, so the inversion flow channel is expressed using the parts formed by the inversion flow channel shown in fig. 4 and 5.
As shown in fig. 4 and 5, the inversion flow path includes a first flow path 101, a second flow path 102, a third flow path 103, and a fourth flow path 104.
The upper core 1 is provided with a sprue 100, the sprue 100 extends in the thickness direction X of the mold, and the sprue 100 communicates with the first runner 101 so that molten plastic can be injected into the inverted runner.
The first flow channel 101 may extend along a straight line, and the cross section of the first flow channel 101 is semicircular. The first flow channel 101 extends perpendicularly to the thickness direction X of the mold. It will be appreciated that the first runner 101 is herein defined mainly by a groove formed in the lower core 2, and that the first runner 101 is formed mainly in the lower core 2, which does not exclude a part of the first runner 101, particularly the upper surface, being defined by the upper core 1. It will be appreciated that similar descriptions for other flow channels may be similarly understood.
The second flow channel 102 is annular, the cross section of the second flow channel 102 is semicircular, and the surface of the second flow channel 102 is perpendicular to the thickness direction X of the die. The two ends of the first flow channel 101 intersect the second flow channel 102, and in particular, the upper surface (plane) of the first flow channel 101 is in contact with or connected to the lower surface (plane) of the second flow channel 102, and the first flow channel 101 divides the second flow channel 102 into two semicircular rings. The first flow channel 101 and the defining second flow channel 102 have overlapping portions such that molten plastic may flow through the first flow channel 101 into the second flow channel 102. It will be appreciated that the second runner 102 is herein defined primarily by a groove formed in the upper core 1, and that the second runner 102 is formed primarily in the upper core 1, which does not exclude a portion of the second runner 102, particularly the lower surface, from being defined by the lower core 2. It will be appreciated that similar descriptions for other flow channels may be similarly understood.
The third flow channel 103 may extend along a straight line, a broken line, or an arc, the cross section of the third flow channel 103 is semicircular, and the third flow channel 103 extends perpendicular to the thickness direction X of the mold. The third flow path 103 may be formed in the lower die core 2. One end of the third flow passage 103 intersects with the second flow passage 102, and in particular, an upper surface (plane) of the third flow passage 103 is in contact with or connected to a lower surface (plane) of the second flow passage 102 such that the third flow passage 103 extends radially outward of the second flow passage 102 from the second flow passage 102. The third flow passages 103 may be provided in plural, for example, two third flow passages 103 may be provided, two third flow passages 103 are provided at both sides of the first flow passage, and two third flow passages 103 intersect with the above-mentioned two semicircular rings, respectively. One of the third flow passages 103 may form a bifurcation. The second flow path 102 and the third flow path 103 have overlapping portions, and the third flow path 103 extends to the annular side wall of the second flow path 102 near the radially inner side so that molten plastic can preferentially flow from the annular side wall of the second flow path 102 near the radially inner side toward the circular arc surface (lower surface) of the third flow path 103.
The fourth runner 104 is formed on the lower mold core 2, the fourth runner 104 may extend along a straight line, the fourth runner 104 extends along a thickness direction X of the mold, and a cross section of the fourth runner 104 may be circular. The fourth flow passage 104 intersects the third flow passage 103, e.g., the fourth flow passage 104 is located approximately at the end of the third flow passage 103. The fourth runner 104 is connected to the mold cavity and allows molten plastic to be poured into the mold cavity to form a corresponding product. The fourth runner 104 may be provided with a plurality, for example three, of molten plastic that may be poured into the mold cavity through the plurality of fourth runners 104 to fill the mold cavity with molten plastic.
The turnover runner comprises an arc-shaped inner wall facing the upper die core 1 and an arc-shaped inner wall facing the lower die core 2. In demolding, the corresponding structure of the second runner 102 only needs to be removed from the groove of the upper mold core 1, and the corresponding structure of the first runner 101 and the third runner 103 only needs to be removed from the groove of the lower mold core 2. The structure formed by the molten plastic in the turnover runner is easy to separate from the upper die core 1 and the lower die core 2, the demoulding success rate is high, and the production efficiency can be improved in the continuous production process.
The lower mold core 2 is provided with a well 106, and the well 106 is located below the sprue 100 and the first runner 101, so that molten plastic injected into the inversion runner through the sprue 100 can flow into the well 106. The cold feed well 106 intersects the first flow path 101.
As shown in fig. 6, when the molten plastic flows in the flow path, the freezing layer 4 is established by shearing with the inner wall 3 of the flow path, and the portion where the freezing layer 4 is preferentially established preferentially flows. Based on the flow shear balancing effect, the plastic tends to flow to the side of the inner wall that first contacts the runner as it turns within the runner, thus creating an imbalance in the shear flow of the plastic in the multi-cavity mold, which can lead to quality problems.
As shown in fig. 4 and 5, molten plastic is injected into the turning flow channel from the pouring gate 100, and after the plastic flows into the pouring gate 100, a uniform frozen layer and a shear layer 6 are established on the inner wall of the pouring gate 100, a part not shown on the periphery of the shear layer 6 is a frozen layer, and the interior of the shear layer 6 is a thermal layer 7. The temperature of the plastic gradually decreases from the inside to the outside (from the hot layer to the frozen layer) and the flow front 5 (see fig. 6) pushes the front cold material vertically down into the cold material well 106.
As the cold charge and molten plastic fill the cold charge well 106, the flow front is split into two flows into the first flow channel 101, with the two flow fronts facing in opposite directions. The molten plastic preferentially builds up a frozen layer and a shear layer 6 on the upper side (planar side) of the first flow channel 101. The flow front gradually flows into the annular second flow channel 102 by depending on the established freezing layer and shearing layer 6, and the original two flow fronts 5 are changed into four flow fronts 5. The flow front originally on the first flow path 101 flows from the upper side (planar side) of the first flow path 101 to the upper side (circular arc side) of the adjoining second flow path 103. The flow fronts first contact the radially inner side wall of the annular second flow channel 102, and the molten plastic preferentially builds up the freezing and shearing layers 6 and preferentially flows and converges to the third flow channel 103, at which time the four flow fronts converge into two flow fronts. The freezing layer 4 and the shear layer 6 are preferably established at the lower circular arc of the third flow channel 103, the flow front turns after flowing downwards at the circular arc of the intersection part of the second flow channel 102 and the third flow channel 103, and flows along the horizontal direction extending along the third flow channel 103 together with the plastic flow reaching along the upper side (plane side) of the third flow channel 103, so that the freezing layer 4 and the shear layer 6 are almost synchronously established at the periphery of the third flow channel 103, and the flow reaches balance.
Thereafter, the flow front 5 of one third flow channel 103 may be split into two flow fronts for injection into the fourth flow channel 104 and ultimately into the mold cavity. The flow front 5 of the further third runner 103 may be injected directly into the further fourth runner 104 and finally into the molding cavity.
While the present application has been described in detail using the above embodiments, it will be apparent to those skilled in the art that the present application is not limited to the embodiments described in the present specification. The present application can be modified and implemented as a modified embodiment without departing from the spirit and scope of the present application as defined by the claims. Accordingly, the descriptions in this specification are for purposes of illustration and are not intended to be limiting in any way.
Claims (8)
1. A mold with a flip runner, the mold with a flip runner comprising:
the upper die core (1), the upper die core (1) is provided with a pouring gate (100) and a second flow channel (102); and
the lower die core (2) is provided with a first runner (101), a third runner (103) and a fourth runner (104);
in the assembled state of the upper die core (1) and the lower die core (2), the pouring opening (100) is sequentially connected with the first runner (101), the second runner (102) and the third runner (103) to form a turnover runner for guiding pouring fluid from the pouring opening (100) to a forming cavity;
in the structure of the turnover flow channel, the second flow channel (102) is arranged in a ring shape and is intersected with two ends of the first flow channel (101), the first flow channel (101) is positioned below the second flow channel (102), one end of the third flow channel (103) is intersected with the second flow channel (102), the second flow channel (102) is positioned above the third flow channel (103), the turnover flow channel comprises a part with a semicircular cross section,
the planar portion of the first flow channel (101) and the planar portion of the second flow channel (102) are oppositely intersected, the planar portion of the second flow channel (102) and the planar portion of the third flow channel (103) are oppositely intersected,
the third flow channel (103) extends to an annular, radially inner side wall of the second flow channel (102).
2. The mold with a flip flow path of claim 1 wherein the mold with a flip flow path is a three-plate mold.
3. The mold with the turning runner according to claim 1 or 2, characterized in that the turning runner comprises an arc-shaped inner wall facing the upper mold core (1) and an arc-shaped inner wall facing the lower mold core (2).
4. The mold with the inverted runner according to claim 1 or 2, characterized in that the third runner (103) extends from the second runner (102) radially outward of the second runner (102).
5. The mold with the inverted runner according to claim 4, wherein the third runner (103) is provided as at least one.
6. The mold with the inverted runner according to claim 5, wherein the fourth runner (104) extends in a thickness direction (X) of the lower die core (2) and intersects the third runner (103), the fourth runner (104) being connected to a molding cavity for forming a product.
7. The mold with the inverted runner according to claim 1 or 2, characterized in that the cross sections of the first runner (101), the second runner (102) and the third runner (103) are all semicircular, and the orientation of the circular arc surfaces of the cross sections of the first runner (101) and the third runner (103) is opposite to the orientation of the circular arc surfaces of the cross sections of the second runner (102).
8. The mold with the inverted runner according to claim 5, wherein the third runner (103) is provided in two, and the two third runners (103) are provided on both sides of the first runner (101).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110675681.1A CN113400592B (en) | 2021-06-18 | 2021-06-18 | Mould with turnover runner |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110675681.1A CN113400592B (en) | 2021-06-18 | 2021-06-18 | Mould with turnover runner |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN113400592A CN113400592A (en) | 2021-09-17 |
| CN113400592B true CN113400592B (en) | 2023-05-05 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110675681.1A Active CN113400592B (en) | 2021-06-18 | 2021-06-18 | Mould with turnover runner |
Country Status (1)
| Country | Link |
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| CN (1) | CN113400592B (en) |
Family Cites Families (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS58131042A (en) * | 1982-01-29 | 1983-08-04 | Sony Corp | Molding method by ring gate |
| AU9695398A (en) * | 1997-10-14 | 1999-05-03 | Penn State Research Foundation, The | Method and apparatus for balancing the filling of injection molds |
| CN101209577A (en) * | 2006-12-30 | 2008-07-02 | 苏州三星电子有限公司 | Cold flow passage multi-mould-hole mould flow passage balance structure |
| CN103963229B (en) * | 2013-02-01 | 2016-05-04 | 深圳市兆威机电有限公司 | A kind of cold runner structure of cavity flow equilibrium |
| CN203680706U (en) * | 2013-10-18 | 2014-07-02 | 通达(厦门)科技有限公司 | Laminated type injection mold |
| CN203726732U (en) * | 2013-12-27 | 2014-07-23 | 厦门涌腾达电子有限公司 | Injection mold reverse runner with balanced flow |
| CN104816438A (en) * | 2015-05-14 | 2015-08-05 | 昆山龙腾光电有限公司 | Mold with multilayer cavities and forming method of rubber frame |
| CN107443683B (en) * | 2017-09-18 | 2019-12-27 | 中车青岛四方车辆研究所有限公司 | Multi-cavity vulcanization mold and preparation method thereof |
| CN211763185U (en) * | 2020-03-09 | 2020-10-27 | 东江模具（深圳）有限公司 | Herringbone balance flow channel |
| CN112959616A (en) * | 2021-03-26 | 2021-06-15 | 江汉大学 | Multi-part micro-plastic part injection mold |
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2021
- 2021-06-18 CN CN202110675681.1A patent/CN113400592B/en active Active
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| Publication number | Publication date |
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| CN113400592A (en) | 2021-09-17 |
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