CN113400592A - Mould with upset runner - Google Patents
Mould with upset runner Download PDFInfo
- Publication number
- CN113400592A CN113400592A CN202110675681.1A CN202110675681A CN113400592A CN 113400592 A CN113400592 A CN 113400592A CN 202110675681 A CN202110675681 A CN 202110675681A CN 113400592 A CN113400592 A CN 113400592A
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- Prior art keywords
- runner
- flow channel
- mold
- inverted
- flow
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- 230000007306 turnover Effects 0.000 claims abstract description 13
- 238000000465 moulding Methods 0.000 claims abstract description 9
- 239000012530 fluid Substances 0.000 claims abstract description 4
- 238000005266 casting Methods 0.000 claims 1
- 238000002347 injection Methods 0.000 abstract description 5
- 239000007924 injection Substances 0.000 abstract description 5
- 230000008014 freezing Effects 0.000 abstract description 2
- 238000007710 freezing Methods 0.000 abstract description 2
- 230000000694 effects Effects 0.000 description 3
- 238000010008 shearing Methods 0.000 description 2
- 238000010924 continuous production Methods 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000001746 injection moulding Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000000034 method 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
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- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Mechanical Engineering (AREA)
- Moulds For Moulding Plastics Or The Like (AREA)
Abstract
The application provides 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 flow passage, a third flow passage and a fourth flow passage; in the state that the upper die core and the lower die core are assembled, the pouring gate is sequentially connected with the first runner, the second runner and the third runner to form an overturning runner for guiding pouring fluid from the pouring gate to a molding cavity; in the structure of the turnover flow channel, the second flow channel is annular and is intersected with 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 by turning the runner, and the flowing shear balance is achieved or made as much as possible when the 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 field of injection molds, and particularly relates to a mold with a turnover flow channel.
Background
When molten plastic flows in the runner gating system, the plastic shears with the inner wall of the runner to establish a frozen layer, and parts of the frozen layer preferentially flow.
Due to the flow shear balance effect, the molten plastic tends to flow to the side contacting the inner wall of the runner first when turning in the runner, thereby causing the plastic shear flow imbalance of the multi-cavity mold, and finally causing frequent quality problems. Therefore, how to solve the problem of shear imbalance inside the runner becomes an important issue in the injection mold industry.
In the prior art, a circular overturning runner design is adopted and only aims at a runner of two plate molds, the design can ensure that products of the two plate molds flow more balanced, the plastic runner turning effect can be finally eliminated by overturning a runner pouring system, and the flow shear balance is achieved when the plastic flow front edge is injected into a product forming cavity. The existing turnover runner pouring system can only be applied to a conventional two-plate mold due to the limitation of a circular (full) runner design, and the problem of unbalanced plastic shearing flow in the three-plate mold is urgently solved.
Disclosure of Invention
The application aims to provide a mould with a turnover flow channel, and the flow shear balance is achieved or made as much as possible when molten plastic is injected into a product forming cavity.
The application provides 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 flow passage, a third flow passage and a fourth flow passage;
in the state that the upper die core and the lower die core are assembled, the pouring gate is sequentially connected with the first runner, the second runner and the third runner to form an overturning runner for guiding pouring fluid from the pouring gate to a molding cavity;
in the structure of the turnover flow channel, the second flow channel is arranged in a ring shape and is intersected with two ends of the first flow channel,
the inverted runner includes a portion having a semi-circular cross-section.
Preferably, the mold with the inverted runner is a three-plate mold.
Preferably, the turning flow passage 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 from the second flow passage to a radially outer side of the second flow passage.
Preferably, the third flow channel 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 all semicircular, and the direction of the arc surface of the cross section of the first flow channel and the direction of the arc surface of the cross section of the third flow channel are opposite to the direction of the arc surface of the cross section of the second flow channel.
Preferably, the third flow passage extends to an annular radially inner side wall of the second flow passage.
Preferably, the planar portion of the first flow passage and the planar portion of the second flow passage intersect oppositely, and the planar portion of the second flow passage and the planar portion of the third flow passage intersect oppositely.
Preferably, two third flow channels are provided, and the two third flow channels are provided on two sides of the first flow channel.
By adopting the technical scheme, the freezing layer is uniformly established through the overturning flow channel of the flow channel with the semicircular section structure in the injection molding process of the three-plate mold, the flowing shear balance is achieved or made as much as possible when the molten plastic is injected into the product forming cavity, and the quality problem of the injection molded product can be avoided or reduced.
Drawings
Fig. 1 is a schematic structural diagram illustrating an upper core of a mold having an inverted runner according to an embodiment of the present application.
Fig. 2 illustrates a perspective view of a lower die core and an inverted runner of a mold having an inverted runner according to an embodiment of the present application.
Fig. 3 illustrates a flow surface elevation view of a lower core of a mold having inverted flow channels according to an embodiment of the present application.
Fig. 4 is a schematic structural view of an inverted runner of a mold having an inverted runner according to an embodiment of the present application.
Fig. 5 illustrates a schematic structural view of another angle of an inverted runner of a mold having an inverted runner according to an embodiment of the present application.
Fig. 6 shows a schematic layering of the flow of molten plastic within the flow channel.
Description of the reference numerals
1 upper die kernel and 2 lower die kernel
100 pouring gate 101 first flow channel 102 second flow channel 103 third flow channel
104 fourth flow passage 106 cold well
3 inner wall of flow channel
4 frozen layer
5 flow front
6 shear layer
7 Heat layer
X thickness direction.
Detailed Description
In order to more clearly illustrate the above objects, features and advantages of the present application, a detailed description of the present application is provided in this section in conjunction with the accompanying drawings. This application is capable of embodiments in addition to those described herein, and is intended to cover such departures from the present disclosure as come within known or customary practice in the art to which this application pertains and which fall within the limits of the appended claims. 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 an inverted runner (hereinafter sometimes simply referred to as a mold), which may be a three-plate mold. It can be understood that, in the three-plate mold, unlike the two-plate mold, the mold has an ejection mechanism for separating the upper mold core 1 from the lower mold core 2, so that the turnover flow channel not only needs to satisfy the thermal shear balance and avoid the quality problem of the manufactured product, but also needs to facilitate the demolding of the turnover flow channel.
The mold with the turnover flow channel 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 flow channel 102, and the lower mold core 2 is provided with a first flow channel 101, a third flow channel 103 and a fourth flow channel 104. In the state that the upper mold core 1 and the lower mold core 2 are fastened together, the pouring gate 100 is connected with the first flow channel 101, the second flow channel 102 and the third flow channel 103 in sequence to form an inverted flow channel for guiding the pouring fluid from the pouring gate 100 to the molding cavity. The turnover flow channel can be communicated with the molding cavity, and molten plastic can be poured into the molding cavity through the turnover flow channel, so that a corresponding product is formed after the plastic is solidified. The inverted flow channel includes a portion of the groove that is semi-circular in cross-section.
It will be appreciated that a semi-circular recess includes a generally semi-circular shape, such as a semi-ellipse or a semi-circular like shape made up of arcs and lines, and the like.
The entire shape of the inverted runner is difficult to directly express, but the shape formed after the molten plastic fills the inverted runner is identical to the shape of the inverted runner, and thus the inverted runner is represented using the member formed by the inverted runner shown in fig. 4 and 5.
As shown in fig. 4 and 5, the turn flow channel includes a first flow channel 101, a second flow channel 102, a third flow channel 103, and a fourth flow channel 104.
The upper mold core 1 is provided with a gate 100, the gate 100 extends along the thickness direction X of the mold, and the gate 100 is communicated with the first runner 101, so that the 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 is understood that the first flow passage 101 is defined mainly by a groove formed in the lower core 2 and the first flow passage 101 is formed mainly in the lower core 2, which does not exclude that a part of the first flow passage 101, particularly the upper surface is defined by the upper core 1. It is to be understood that similar descriptions of other flow passages may be similarly understood.
The second runner 102 is annular, the cross section of the second runner 102 is semicircular, and the plane of the second runner 102 is perpendicular to the thickness direction X of the die. Both ends of the first flow channel 101 intersect with the second flow channel 102, and particularly, an upper surface (plane) of the first flow channel 101 is in contact with or connected to a 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 second flow channel 102 have coinciding portions so that molten plastic can flow through the first flow channel 101 into the second flow channel 102. It is to be understood that the second flow passage 102 is defined mainly by a groove formed in the upper core 1 and the second flow passage 102 is formed mainly in the upper core 1, which does not exclude that a part of the second flow passage 102, particularly the lower surface is defined by the lower core 2. It is to be understood that similar descriptions of other flow passages may be similarly understood.
The third runner 103 may extend along a straight line, a broken line, or an arc line, the cross section of the third runner 103 is semicircular, and the third runner 103 extends perpendicularly to the thickness direction X of the mold. The third flow passage 103 may be formed in the lower core 2. One end of the third flow channel 103 intersects the second flow channel 102, and in particular, an upper surface (plane) of the third flow channel 103 is in contact with or connected to a lower surface (plane) of the second flow channel 102, so that the third flow channel 103 extends from the second flow channel 102 to the radially outer side of the second flow channel 102. The third flow channel 103 may be provided with a plurality of third flow channels, for example, two third flow channels 103 may be provided, two third flow channels 103 are provided on two sides of the first flow channel, and the two third flow channels 103 intersect with the two semicircular rings respectively. One of the third flow passages 103 may be branched. The second flow channel 102 and the third flow channel 103 have overlapping portions, and the third flow channel 103 extends to the annular radially inner side wall of the second flow channel 102, so that the molten plastic can preferentially flow from the annular radially inner side wall of the second flow channel 102 to the arc surface (lower surface) of the third flow channel 103.
The fourth runner 104 is formed in the lower core 2, the fourth runner 104 may extend along a straight line, the fourth runner 104 extends along the thickness direction X of the mold, and the cross section of the fourth runner 104 may be circular. Fourth flow channel 104 intersects third flow channel 103, e.g., fourth flow channel 104 is located at approximately the end of third flow channel 103. The fourth runner 104 is connected to the mold cavity so that molten plastic can be poured into the mold cavity to form the corresponding product. The fourth runner 104 may be provided with a plurality of, for example, three, and the molten plastic may be poured into the molding cavity through the plurality of fourth runners 104 so that the molding cavity is filled with the molten plastic.
The turnover flow passage comprises an arc-shaped inner wall facing the upper die core 1 and an arc-shaped inner wall facing the lower die core 2. During demolding, the structure corresponding to the second flow channel 102 only needs to be pulled out of the groove of the upper mold core 1, and the structure corresponding to the first flow channel 101 and the third flow channel 103 only needs to be pulled out of the groove of the lower mold core 2. The structure formed by the molten plastic in the overturning flow channel is easily separated from the upper mold core 1 and the lower mold core 2, the demolding 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 cold charge well 106, and the cold charge well 106 is positioned below the sprue 100 and the first runner 101 so that the molten plastic injected into the inverted runner through the sprue 100 can flow into the cold charge well 106. The cold well 106 intersects the first flow channel 101.
As shown in fig. 6, when the molten plastic flows in the flow passage, the frozen layer 4 is established by shearing with the inner wall 3 of the flow passage, and a portion where the frozen layer 4 is preferentially established preferentially flows. Due to the flow shear balance effect, the plastic tends to flow to the side that first contacts the inner wall of the runner when turning in the runner, thus causing an imbalance in the plastic shear flow of the multi-cavity mold, which leads to quality problems.
As shown in fig. 4 and 5, the molten plastic is injected into the inverted runner from the gate 100, and after the plastic flows into the gate 100, a uniform frozen layer and a shear layer 6 are established on the inner wall of the gate 100, the part not shown on the periphery of the shear layer 6 is the frozen layer, and the inside of the shear layer 6 is the thermal layer 7. The temperature of the plastic decreases gradually from the inside to the outside (from the hot layer to the frozen layer), and the flow front 5 (see fig. 6) pushes the cold charge at the front end to flow vertically downward into the cold charge well 106.
As the cold charge and molten plastic fill cold charge well 106, the flow front is split into two flows into 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 runner 101. The flow front gradually flows into the second flow channel 102 in a circular ring shape by relying on the already established freeze layer and shear layer 6, and changes from the original two flow fronts 5 into four flow fronts 5. The flow front that originally existed on the first flow channel 101 flows from the upper side (planar side) of the first flow channel 101 to the upper side (circular arc side) that meets the second flow channel 103. The flow front first contacts the side wall of the annular second flow channel 102 close to the radial inner side, the molten plastic preferentially builds up the frozen layer and the shear layer 6 and preferentially flows and converges to the third flow channel 103, and at this time, the four flow fronts converge into two flow fronts. The lower arc of the third flow channel 103 preferentially establishes the frozen layer 4 and the shear layer 6, the flow front flows downwards at the arc of the intersection of the second flow channel 102 and the third flow channel 103 and turns, and flows along the horizontal direction extending along the third flow channel 103 together with the plastic flow arriving along the upper side (plane side) of the third flow channel 103, so that the frozen layer 4 and the shear layer 6 are established almost synchronously around the third flow channel 103, and the flow is balanced.
The flow front 5 of one third flow channel 103 may then 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 flow channel 103 can be injected directly into the further fourth flow channel 104 and finally into the mold cavity.
While the present application has been described in detail with reference to 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 defined by the claims. Therefore, the description in this specification is for illustrative purposes and does not have any limiting meaning for the present application.
Claims (10)
1. A mold with inverted runners, comprising:
the casting mold comprises an upper mold core (1), wherein the upper mold core (1) is provided with a pouring gate (100) and a second runner (102); and
the lower die core (2), 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 gate (100) is sequentially connected with the first runner (101), the second runner (102) and the third runner (103) to form an overturning runner for guiding pouring fluid from the pouring gate (100) to a molding 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 inverted runner includes a portion having a semi-circular cross-section.
2. The mold with inverted runner of claim 1, wherein the mold with inverted runner is a three-plate mold.
3. The mold with an inverted runner according to claim 1 or 2, wherein the inverted 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. A mould with inverted runner according to claim 1 or 2, characterised in that one end of the third runner (103) intersects the second runner (102), the third runner (103) extending from the second runner (102) radially outwards of the second runner (102).
5. A mould with inverted runner according to claim 4, characterised in that the third runner (103) is provided as at least one.
6. The mold with inverted runner according to claim 5, wherein the fourth runner (104) extends along the thickness direction (X) of the lower mold core (2) and intersects with the third runner (103), and the fourth runner (104) is connected to a molding cavity for forming a product.
7. The mold with 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 surface of the cross section of the first runner (101) and the third runner (103) is opposite to that of the circular arc surface of the cross section of the second runner (102).
8. Mould with inverted runner according to claim 4, characterised in that the third runner (103) extends to the annular, near radially inner side wall of the second runner (102).
9. The mold with inverted runner of claim 4, wherein the planar portion of the first runner (101) and the planar portion of the second runner (102) oppositely intersect, and the planar portion of the second runner (102) and the planar portion of the third runner (103) oppositely intersect.
10. The mold with inverted runner according to claim 5, characterized in that the third runner (103) is provided with two, 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 true CN113400592A (en) | 2021-09-17 |
| CN113400592B CN113400592B (en) | 2023-05-05 |
Family
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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 |
|---|---|
| CN (1) | CN113400592B (en) |
Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS58131042A (en) * | 1982-01-29 | 1983-08-04 | Sony Corp | Molding method by ring gate |
| US6077470A (en) * | 1997-10-14 | 2000-06-20 | The Penn State Research Foundation | 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 |
| 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 |
| CN103963229A (en) * | 2013-02-01 | 2014-08-06 | 深圳市兆威机电有限公司 | Novel multi-cavity flow-balance cold runner structure |
| 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 |
| CN107443683A (en) * | 2017-09-18 | 2017-12-08 | 中车青岛四方车辆研究所有限公司 | A kind of Multicarity sulfurizing mould and preparation method |
| 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 |
-
2021
- 2021-06-18 CN CN202110675681.1A patent/CN113400592B/en active Active
Patent Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS58131042A (en) * | 1982-01-29 | 1983-08-04 | Sony Corp | Molding method by ring gate |
| US6077470A (en) * | 1997-10-14 | 2000-06-20 | The Penn State Research Foundation | 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 |
| CN103963229A (en) * | 2013-02-01 | 2014-08-06 | 深圳市兆威机电有限公司 | Novel multi-cavity flow-balance cold runner structure |
| 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 |
| CN107443683A (en) * | 2017-09-18 | 2017-12-08 | 中车青岛四方车辆研究所有限公司 | A kind of Multicarity sulfurizing mould and preparation method |
| 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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| Publication number | Publication date |
|---|---|
| CN113400592B (en) | 2023-05-05 |
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