CN109228177A - The mechanism and method for preventing mould gate melt from flowing backwards - Google Patents
The mechanism and method for preventing mould gate melt from flowing backwards Download PDFInfo
- Publication number
- CN109228177A CN109228177A CN201811188381.5A CN201811188381A CN109228177A CN 109228177 A CN109228177 A CN 109228177A CN 201811188381 A CN201811188381 A CN 201811188381A CN 109228177 A CN109228177 A CN 109228177A
- Authority
- CN
- China
- Prior art keywords
- gate
- plunger
- melt
- mold
- mold cavity
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 238000000034 method Methods 0.000 title claims abstract description 11
- 238000001816 cooling Methods 0.000 claims abstract description 23
- 239000000155 melt Substances 0.000 claims abstract description 12
- 239000000110 cooling liquid Substances 0.000 claims abstract 4
- 239000002861 polymer material Substances 0.000 claims abstract 2
- 239000002826 coolant Substances 0.000 claims description 12
- 238000002347 injection Methods 0.000 claims description 11
- 239000007924 injection Substances 0.000 claims description 11
- 238000002360 preparation method Methods 0.000 claims description 2
- 238000001746 injection moulding Methods 0.000 claims 1
- 229920000642 polymer Polymers 0.000 claims 1
- 238000000465 moulding Methods 0.000 abstract 1
- 239000007788 liquid Substances 0.000 description 3
- 229920002521 macromolecule Polymers 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 238000011065 in-situ storage Methods 0.000 description 2
- 238000007711 solidification Methods 0.000 description 2
- 230000008023 solidification Effects 0.000 description 2
- 238000005299 abrasion Methods 0.000 description 1
- 238000005266 casting Methods 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000001125 extrusion Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
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
- B29C45/28—Closure devices therefor
-
- 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
- B29C45/72—Heating or cooling
- B29C45/73—Heating or cooling of the mould
- B29C45/7312—Construction of heating or cooling fluid flow channels
Landscapes
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Moulds For Moulding Plastics Or The Like (AREA)
- Injection Moulding Of Plastics Or The Like (AREA)
Abstract
本发明涉及高分子材料加工设备技术领域，尤其涉及一种防止模具浇口熔体倒流的机构和方法，包括模具腔、流道、浇口和冷却管道，模具腔和流道通过浇口相连通，冷却管道环绕在浇口外部，冷却管道和模具外部的冷却液供给装置相连接，模具腔内靠近浇口处安装有第一压力传感器，流道内靠近浇口处安装有第二压力传感器，模具内还设置有柱塞，柱塞位于浇口的上方，浇口上设置有柱塞口，防止模具浇口熔体倒流的机构还包括推动装置和智能控制器，柱塞的下端和柱塞口相连接，柱塞的上端和推动装置相连接。本发明的防止模具浇口熔体倒流的机构和方法，能够快速阻止模具腔中的熔体倒流，自动化调节浇口的尺寸和冷却，保证模具腔的成型质量，提高模具工作效率。
The invention relates to the technical field of polymer material processing equipment, in particular to a mechanism and method for preventing the backflow of melt at the gate of a mold, comprising a mold cavity, a runner, a gate and a cooling pipe, and the mold cavity and the runner are connected through the gate , the cooling pipe surrounds the outside of the gate, and the cooling pipe is connected to the cooling liquid supply device outside the mold. A first pressure sensor is installed in the mold cavity near the gate, and a second pressure sensor is installed in the runner near the gate. There is also a plunger inside, the plunger is located above the gate, and the gate is provided with a plunger port. The mechanism to prevent the backflow of the mold gate melt also includes a pushing device and an intelligent controller. The lower end of the plunger is in phase with the plunger port. Connection, the upper end of the plunger is connected with the push device. The mechanism and method for preventing the melt backflow of the mold gate can quickly prevent the melt backflow in the mold cavity, automatically adjust the size and cooling of the gate, ensure the molding quality of the mold cavity, and improve the working efficiency of the mold.
Description
Technical field
The present invention relates to processing of high molecular material equipment technical fields more particularly to one kind to prevent mould gate melt from flowing backwards
Mechanism and method.
Background technique
Traditional extrusion molding mould cast gate is generally rigid, when cast gate is larger, when injector screw retreats, in die cavity
Macromolecule melt pressure be greater than flowpath pressure, melt can flow back to screw front end from die cavity through cast gate, runner, influence plastic
Dimensional accuracy.
Summary of the invention
The technical problem to be solved by the present invention is in order to solve before melt can flow back to screw rod through cast gate, runner from die cavity
End, the technical issues of influencing the dimensional accuracy of plastic, the present invention provide a kind of mechanism for preventing mould gate melt from flowing backwards and side
Method considers that this refluence reason is that gate size is larger, and gate freeze is slow, so correcting to mould gate structure, intelligence
It is adjustable the size and cooling of cast gate, solves melt backward flow problem, improves mold work efficiency.
The technical solution adopted by the present invention to solve the technical problems is: a kind of machine for preventing mould gate melt from flowing backwards
Structure, including mold cavity, runner, cast gate and cooling pipe in the mould is arranged, the mold cavity and runner pass through cast gate
It is connected, the cooling pipe is looped around outside cast gate, and cooling pipe is connected with the coolant supply apparatus of mold exterior, institute
It states and first pressure sensor is installed at cast gate in mold cavity, second pressure sensing is installed at cast gate in runner
Device is additionally provided with plunger in the mold, and plunger is located at the top of cast gate, is provided with plunger ports on cast gate, described to prevent mold
The mechanism that cast gate melt is flow backwards further includes pushing meanss and intelligent controller, and the lower end of plunger is connected with plunger ports, plunger
Upper end is connected with pushing meanss, and the first pressure sensor and second pressure sensor connect with intelligent controller signal
It connects, coolant supply apparatus and pushing meanss are connect with intelligent controller signal, and when pushing meanss do not work, plunger gets lodged in column
At mouth, when pushing meanss work, plunger protrudes into cast gate and blocks cast gate.
Preferably, the pushing meanss use cylinder, the piston rod top end of cylinder is connected with upper end.
Preferably, the runner section is circle, plunger is in disc-shaped, and the surface of plunger is mutually hung down with the axis of cast gate
Directly.The shape of plunger ports and diameter, the thickness of disk match.
Preferably, the runner section be it is rectangular, plunger in the form of sheets, mutually hang down with the length direction of cast gate by the surface of plunger
Directly.The shape of plunger ports and width, the thickness of disk match.
A method of prevent mould gate melt from flowing backwards, using the described mechanism for preventing mould gate melt from flowing backwards,
It is characterized by comprising following steps:
1) when being injection moulded, injector rapidly enters macromolecule melt in mold cavity from runner by cast gate, and melt exists
Gradually solidification cooling in mold cavity,
2) and in order to improve injection efficiency, the screw rod meeting rotated back of injector is plasticized high molecular material, is next time
Injection plastic is prepared, and before screw retreats, the pressure P1 that first pressure sensor measures is sensed less than or equal to second pressure
The pressure P2 that device measures, once but screw retreats, screw front end barrel is interior to form negative pressure, then pressure P2 can be less than pressure P1, (P1
Do not reduced also substantially since mold cavity volume is relatively large in screw retreats pressure for the pressure in mold cavity) due to pressure
The melt of difference, mold cavity has the tendency that refluence, flows backwards always from mold cavity by cast gate, runner, using nozzle of injector into
Enter the space of screw front end,
Setting is when P1 is greater than P2 and is more than 0.01MPa, intelligent controller work, and triggering pushing meanss work pushes plunger,
Cast gate is blocked, so that cast gate temporary enclosed, at the same time, intelligent controller start coolant supply apparatus work, to cooling tube
It is passed through coolant liquid in road to cool down cast gate, so that the melt quick freeze in cast gate, prevents molten in mold cavity
Body is flow backwards,
3) melt gradually cools down in mold cavity, and pressure P1 is reduced.As pressure P1 < P2, intelligent controller triggering pushes dress
Withdrawal plunger is set, it is subsequent smooth ejection plastic that coolant supply apparatus, which stops cooling cast gate, and plunger retracts (reset) in situ
It prepares with running gate system.
The invention has the advantages that the mechanism and method for preventing mould gate melt from flowing backwards of the invention, it can be quick
The melt in mold cavity is prevented to flow backwards, automation adjusts the size and cooling of cast gate, guarantees the Forming Quality of mold cavity, improves mould
Has working efficiency.
Detailed description of the invention
Present invention will be further explained below with reference to the attached drawings and examples.
Fig. 1 is the structural schematic diagram for the mechanism that the present invention prevents mould gate melt from flowing backwards.
In figure: 1, mold cavity, 2, runner, 3, cast gate, 4, cooling pipe, 5, first pressure sensor, 6, second pressure biography
Sensor, 7, plunger, 8, pushing meanss, 9, intelligent controller.
Specific embodiment
In conjunction with the accompanying drawings, the present invention is further explained in detail.These attached drawings are simplified schematic diagram, only with
Illustration illustrates basic structure of the invention, therefore it only shows the composition relevant to the invention.
As shown in Figure 1, be optimum embodiment of the present invention, a kind of mechanism for preventing mould gate melt from flowing backwards, including setting
Mold cavity 1, runner 2, cast gate 3 and cooling pipe 4 in the mould, mold cavity 1 and runner 2 are connected by cast gate 3, cold
But pipeline 4 is looped around outside cast gate 3, and cooling pipe 4 is connected with the coolant supply apparatus of mold exterior, is leaned in mold cavity 1
First pressure sensor 5 is installed at nearly cast gate 3, second pressure sensor 6 is installed at cast gate 3 in runner 2, in mold
It is additionally provided with plunger 7, plunger 7 is located at the top of cast gate 3, is provided with plunger ports on cast gate 3, prevents mould gate melt from flowing backwards
Mechanism further includes pushing meanss 8 and intelligent controller 9, and the lower end of plunger 7 is connected with plunger ports, the upper end of plunger 7 and promotion
Device 8 is connected, and first pressure sensor 5 and second pressure sensor 6 are connect with 9 signal of intelligent controller, and coolant liquid supplies
It being connect with 9 signal of intelligent controller to device and pushing meanss 8, when pushing meanss 8 do not work, plunger 7 is got lodged at plunger ports,
When pushing meanss 8 work, plunger 7 protrudes into cast gate 3 and blocks cast gate 3.
Pushing meanss 8 use cylinder, and the piston rod top end of cylinder is connected with the upper end of plunger 7.Cylinder is fixedly mounted on
On mold.
3 section of cast gate be circle, plunger 7 in the form of sheets, the surface of plunger 7 and the axis perpendicular of cast gate 3.Or cast gate 3
Section be it is rectangular, in the form of sheets, the surface of plunger 7 and the length direction of cast gate 3 are perpendicular for plunger 7.
A method of prevent mould gate melt from flowing backwards, using the described mechanism for preventing mould gate melt from flowing backwards,
Include the following steps:
1) when being injection moulded, injector rapidly enters macromolecule melt in mold cavity 1 from runner 2 by cast gate 3, melt
The gradually solidification cooling in mold cavity 1,
2) and in order to improve injection efficiency, the screw rod meeting rotated back of injector is plasticized high molecular material, is next time
Injection plastic is prepared.Before screw retreats, the pressure P1 that first pressure sensor 5 measures is sensed less than or equal to second pressure
The pressure P2 that device 6 measures, once but screw retreats, screw front end barrel is interior to form negative pressure, then pressure P2 can be less than pressure P1, by
Have the tendency that refluence in the melt of pressure difference, mold cavity 1, is flow backwards always from mold cavity 1 by cast gate 3, runner 2, using note
The space that machine nozzle enters screw front end is penetrated,
When P1 is greater than P2 and is more than 0.01MPa, intelligent controller 9 works for setting, and triggering pushing meanss 8 work, and push column
Plug 7, blocks cast gate 3, so that 3 temporary enclosed of cast gate, at the same time, intelligent controller 9 start coolant supply apparatus, to cooling
It is passed through coolant liquid in pipeline 4 to cool down cast gate 3, so that the melt quick freeze in cast gate 3, prevents mold cavity 1
In melt flow backwards,
3) melt gradually cools down in mold cavity 1, and pressure P1 is reduced.As pressure P1 < P2, the triggering of intelligent controller 9 is pushed
Device 8 withdraws plunger 7, and it is subsequent smooth top that coolant supply apparatus, which stops cooling cast gate 3, and plunger 7 retracts (reset) in situ
Plastic and running gate system are prepared out.After resetting in this way, plunger 7 will not block 3 cold burden of cast gate, will not influence plastic and casting
The abjection of system cold burden.If there is multiple cast gates 3 (a multi-cavity mold), joint triggering intelligent switch can be commonly used, so that multiple pour
Mouth 3 is completed at the same time closing and breakdown action.
In order to reduce the fretting wear between plunger 7 and plunger ports, when preparation, is low by the ratio plunger ports of 7 hardness Design of plunger
5 degree, in this way, can be replaced after plunger 7 is worn.Plunger bushing can also be installed additional, reduce abrasion of the plunger 7 for plunger ports.
It is clearance fit such as H7/f7 between plunger 7 and plunger ports (plunger bushing), prevents melt flash.
Taking the above-mentioned ideal embodiment according to the present invention as inspiration, through the above description, relevant staff is complete
Various changes and amendments can be carried out without departing from the scope of the technological thought of the present invention' entirely.The technology of this invention
Property range is not limited to the contents of the specification, it is necessary to which the technical scope thereof is determined according to the scope of the claim.
Claims (5)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811188381.5A CN109228177B (en) | 2018-10-12 | 2018-10-12 | Mechanism and method for preventing backflow of mold gate melt |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811188381.5A CN109228177B (en) | 2018-10-12 | 2018-10-12 | Mechanism and method for preventing backflow of mold gate melt |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN109228177A true CN109228177A (en) | 2019-01-18 |
| CN109228177B CN109228177B (en) | 2020-10-09 |
Family
ID=65052331
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201811188381.5A Active CN109228177B (en) | 2018-10-12 | 2018-10-12 | Mechanism and method for preventing backflow of mold gate melt |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN109228177B (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115302718A (en) * | 2022-08-24 | 2022-11-08 | 苏州迈创信息技术有限公司 | A molding die for injection molding parts of security camera shell |
| CN115635654A (en) * | 2022-10-26 | 2023-01-24 | 宁波誉立精密模具有限公司 | A two-color injection mold |
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| US20030085491A1 (en) * | 2001-11-07 | 2003-05-08 | Fuji Photo Film Co., Ltd. | Heat exchange apparatus for a metal mold |
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| CN108437374A (en) * | 2018-04-08 | 2018-08-24 | 温州职业技术学院 | A kind of injection mold anti-backflow device |
| CN207842065U (en) * | 2018-02-03 | 2018-09-11 | 天津智慧三迪科技有限公司 | A kind of anticlogging 3D printer print head assembly |
| CN207859369U (en) * | 2018-01-29 | 2018-09-14 | 东莞市福瑞旺精密模具科技有限公司 | An anti-clogging plastic injection mold |
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2018
- 2018-10-12 CN CN201811188381.5A patent/CN109228177B/en active Active
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0839645A (en) * | 1994-07-27 | 1996-02-13 | Mitsubishi Chem Corp | Optical disc substrate molding method |
| US20030085491A1 (en) * | 2001-11-07 | 2003-05-08 | Fuji Photo Film Co., Ltd. | Heat exchange apparatus for a metal mold |
| CN1754680A (en) * | 2004-10-01 | 2006-04-05 | 日精树脂工业株式会社 | Method for preventing backflow of resin in injection apparatus |
| CN103448216A (en) * | 2012-05-31 | 2013-12-18 | 黄宇刚 | Dynamic gate-based injection molding method |
| CN203495232U (en) * | 2013-08-26 | 2014-03-26 | 苏州米莫金属科技有限公司 | Injection molding mold capable of preventing backflow |
| CN203426370U (en) * | 2013-09-04 | 2014-02-12 | 南京优耐特精密铸造有限公司 | Device of preventing cerate from reversely flowing |
| WO2016032078A1 (en) * | 2014-08-25 | 2016-03-03 | 한국교통대학교산학협력단 | Film insert molding apparatus employing injection compression molding and method therefor |
| CN207859369U (en) * | 2018-01-29 | 2018-09-14 | 东莞市福瑞旺精密模具科技有限公司 | An anti-clogging plastic injection mold |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115302718A (en) * | 2022-08-24 | 2022-11-08 | 苏州迈创信息技术有限公司 | A molding die for injection molding parts of security camera shell |
| CN115635654A (en) * | 2022-10-26 | 2023-01-24 | 宁波誉立精密模具有限公司 | A two-color injection mold |
Also Published As
| Publication number | Publication date |
|---|---|
| CN109228177B (en) | 2020-10-09 |
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Effective date of registration: 20221222 Address after: 213102 No. 1, dajingba, Yaoguan Town, Wujin District, Changzhou City, Jiangsu Province Patentee after: Changzhou Yuming Electronics Co.,Ltd. Address before: No. 1, Wujin District, Wujin District, Changzhou, Jiangsu Patentee before: CHANGZHOU University |
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