CN109228177B - Mechanism and method for preventing backflow of mold gate melt - Google Patents
Mechanism and method for preventing backflow of mold gate melt Download PDFInfo
- Publication number
- CN109228177B CN109228177B CN201811188381.5A CN201811188381A CN109228177B CN 109228177 B CN109228177 B CN 109228177B CN 201811188381 A CN201811188381 A CN 201811188381A CN 109228177 B CN109228177 B CN 109228177B
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- plunger
- gate
- mold
- melt
- mold cavity
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- 238000000034 method Methods 0.000 title claims abstract description 15
- 238000001816 cooling Methods 0.000 claims abstract description 21
- 239000000155 melt Substances 0.000 claims abstract description 21
- 239000000110 cooling liquid Substances 0.000 claims abstract description 15
- 239000002861 polymer material Substances 0.000 claims abstract description 5
- 238000002347 injection Methods 0.000 claims description 14
- 239000007924 injection Substances 0.000 claims description 14
- 238000001746 injection moulding Methods 0.000 claims description 6
- 229920000642 polymer Polymers 0.000 claims description 4
- 239000002826 coolant Substances 0.000 claims 1
- 239000007788 liquid Substances 0.000 claims 1
- 238000000465 moulding Methods 0.000 abstract description 2
- 230000007423 decrease Effects 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 238000005299 abrasion Methods 0.000 description 1
- 238000001125 extrusion Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 230000001960 triggered effect Effects 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
- B29C45/28—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
The invention relates to the technical field of high polymer material processing equipment, in particular to a mechanism and a method for preventing backflow of a mold gate melt, and the mechanism comprises a mold cavity, a flow channel, a gate and a cooling pipeline, wherein the mold cavity is communicated with the flow channel through the gate, the cooling pipeline surrounds the outside of the gate, the cooling pipeline is connected with a cooling liquid supply device outside the mold, a first pressure sensor is arranged in the mold cavity close to the gate, a second pressure sensor is arranged in the flow channel close to the gate, a plunger is further arranged in the mold and positioned above the gate, a plunger port is arranged on the gate, the mechanism for preventing backflow of the mold gate melt further comprises a pushing device and an intelligent controller, the lower end of the plunger is connected with the plunger port, and the upper end of the plunger is connected with. The mechanism and the method for preventing the backflow of the melt at the sprue of the mold can quickly prevent the backflow of the melt in the mold cavity, automatically adjust the size and the cooling of the sprue, ensure the molding quality of the mold cavity and improve the working efficiency of the mold.
Description
Technical Field
The invention relates to the technical field of high polymer material processing equipment, in particular to a mechanism and a method for preventing backflow of a mold gate melt.
Background
The traditional extrusion molding die gate is generally rigid, when the gate is large, and an injection machine screw rod retreats, the pressure of a high polymer melt in a die cavity is larger than that of a runner, and the melt can flow back to the front end of the screw rod from the die cavity through the gate and the runner, so that the size precision of a plastic part is influenced.
Disclosure of Invention
The technical problem to be solved by the invention is as follows: the invention provides a mechanism and a method for preventing a mold gate melt from flowing backwards, aiming at solving the technical problem that the melt can flow backwards from a mold cavity to the front end of a screw rod through a gate and a runner to influence the dimensional accuracy of a plastic part.
The technical scheme adopted by the invention for solving the technical problems is as follows: a mechanism for preventing a mold gate melt from flowing backwards comprises a mold cavity, a runner, a gate and a cooling pipeline which are arranged in a mold, wherein the mold cavity is communicated with the runner through the gate, the cooling pipeline surrounds the outside of the gate, the cooling pipeline is connected with a cooling liquid supply device outside the mold, a first pressure sensor is arranged in the mold cavity close to the gate, a second pressure sensor is arranged in the runner close to the gate, a plunger is further arranged in the mold and positioned above the gate, a plunger port is arranged on the gate, the mechanism for preventing the mold gate melt from flowing backwards further comprises a pushing device and an intelligent controller, the lower end of the plunger is connected with the plunger port, the upper end of the plunger is connected with the pushing device, the first pressure sensor and the second pressure sensor are in signal connection with the intelligent controller, and the cooling liquid supply device and the pushing device are in signal connection with the intelligent controller, when the pushing device does not work, the plunger is blocked at the position of the plunger opening, and when the pushing device works, the plunger extends into the pouring gate and blocks the pouring gate.
Preferably, the pushing device adopts a cylinder, and the top end of a piston rod of the cylinder is connected with the upper end of the plunger.
Preferably, the gate has a circular cross-section, the plunger has a disk shape, and a surface of the plunger is perpendicular to an axis of the gate. The shape of the plunger opening is matched with the diameter and the thickness of the circular sheet.
Preferably, the gate has a square cross-section, the plunger has a sheet shape, and a surface of the plunger is perpendicular to a longitudinal direction of the gate. The shape of the plunger opening is matched with the width and the thickness of the wafer.
The utility model provides a method for preventing backflow of mould runner fuse-element, adopt the mechanism that prevents backflow of mould runner fuse-element, its characterized in that: the method comprises the following steps:
1) when in injection molding, the injection machine quickly enters the polymer melt into the mold cavity from the runner through the sprue, the melt is gradually solidified and cooled in the mold cavity,
2) in order to improve the injection efficiency, a screw rod of the injection machine rotates backwards to plasticize the high polymer material, and the injection machine prepares for the next injection molding piece, before the screw rod retreats, the pressure P1 measured by a first pressure sensor is lower than or equal to the pressure P2 measured by a second pressure sensor, but once the screw rod retreats, negative pressure is formed in a charging barrel at the front end of the screw rod, the pressure P2 is smaller than the pressure P1, (P1 is the pressure in a mold cavity, and because the volume of the mold cavity is relatively larger, the pressure is not reduced basically during the retreating of the screw rod), the melt in the mold cavity has the tendency of backflow, flows backwards from the mold cavity all the time through a sprue and a runner, and then flows through a nozzle of the injection machine to enter the space,
setting that when P1 is larger than P2 and exceeds 0.01MPa, the intelligent controller works to trigger the pushing device to work to push the plunger to block the pouring gate so as to temporarily close the pouring gate, meanwhile, the intelligent controller starts the cooling liquid supply device to work to introduce cooling liquid into the cooling pipeline to cool the pouring gate so as to quickly freeze the melt in the pouring gate and completely prevent the melt in the die cavity from flowing backwards,
3) the melt in the mold cavity gradually cools and the pressure P1 decreases. When the pressure P1< P2, the intelligent controller triggers the pushing device to withdraw the plunger, the cooling liquid supply device stops cooling the pouring gate, and the plunger returns to the original position (reset) to prepare for subsequent smooth ejection of the plastic part and the pouring system.
The mechanism and the method for preventing the backflow of the melt at the sprue of the mold have the advantages that the backflow of the melt in the mold cavity can be quickly prevented, the size and the cooling of the sprue are automatically adjusted, the molding quality of the mold cavity is guaranteed, and the working efficiency of the mold is improved.
Drawings
The invention is further illustrated with reference to the following figures and examples.
FIG. 1 is a schematic structural view of a mechanism for preventing backflow of mold gate melt according to the present invention.
In the figure: 1. the mold comprises a mold cavity, 2, a flow channel, 3, a pouring gate, 4, a cooling pipeline, 5, a first pressure sensor, 6, a second pressure sensor, 7, a plunger, 8, a pushing device, 9 and an intelligent controller.
Detailed Description
The present invention will now be described in further detail with reference to the accompanying drawings. These drawings are simplified schematic views illustrating only the basic structure of the present invention in a schematic manner, and thus show only the constitution related to the present invention.
As shown in fig. 1, which is a preferred embodiment of the present invention, a mechanism for preventing backflow of a mold gate melt comprises a mold cavity 1, a runner 2, a gate 3 and a cooling pipeline 4 arranged in the mold, wherein the mold cavity 1 and the runner 2 are communicated through the gate 3, the cooling pipeline 4 surrounds the outside of the gate 3, the cooling pipeline 4 is connected with a cooling liquid supply device outside the mold, a first pressure sensor 5 is arranged in the mold cavity 1 near the gate 3, a second pressure sensor 6 is arranged in the runner 2 near the gate 3, a plunger 7 is further arranged in the mold, the plunger 7 is positioned above the gate 3, a plunger opening is arranged on the gate 3, the mechanism for preventing backflow of the mold gate melt further comprises a pushing device 8 and an intelligent controller 9, the lower end of the plunger 7 is connected with the plunger opening, the upper end of the plunger 7 is connected with the pushing device 8, the first pressure sensor 5 and the second pressure sensor 6 are both in signal connection with the intelligent controller 9, the cooling liquid supply device and the pushing device 8 are in signal connection with the intelligent controller 9, when the pushing device 8 does not work, the plunger 7 is blocked at the position of the plunger opening, and when the pushing device 8 works, the plunger 7 extends into the pouring gate 3 and blocks the pouring gate 3.
The pushing device 8 adopts a cylinder, and the top end of a piston rod of the cylinder is connected with the upper end of the plunger 7. The cylinder is fixedly arranged on the die.
The gate 3 is circular in cross section, the plunger 7 is sheet-shaped, and the surface of the plunger 7 is perpendicular to the axis of the gate 3. Or the cross section of the gate 3 is square, the plunger 7 is sheet-shaped, and the surface of the plunger 7 is vertical to the length direction of the gate 3.
The method for preventing the backflow of the melt at the sprue of the mold comprises the following steps of:
1) when in injection molding, the injection machine rapidly enters the polymer melt into the mold cavity 1 from the runner 2 through the sprue 3, the melt is gradually solidified and cooled in the mold cavity 1,
2) in order to improve the injection efficiency, the screw of the injection machine rotates and retreats to plasticize the high polymer material, so as to prepare for the next injection molding. Before the screw rod retreats, the pressure P1 measured by the first pressure sensor 5 is lower than or equal to the pressure P2 measured by the second pressure sensor 6, but once the screw rod retreats, negative pressure is formed in a charging barrel at the front end of the screw rod, the pressure P2 is smaller than the pressure P1, and because of pressure difference, melt of the mold cavity 1 has the tendency of flowing backwards, flows backwards all the way from the mold cavity 1 through the sprue 3 and the runner 2, passes through a nozzle of an injection machine and enters a space at the front end of the screw rod,
setting that when P1 is larger than P2 and exceeds 0.01MPa, the intelligent controller 9 works to trigger the pushing device 8 to work to push the plunger 7 to block the pouring gate 3, so that the pouring gate 3 is temporarily closed, meanwhile, the intelligent controller 9 starts the cooling liquid supply device to introduce cooling liquid into the cooling pipeline 4 to cool the pouring gate 3, so that the melt in the pouring gate 3 is rapidly frozen, the melt in the mold cavity 1 is completely prevented from flowing backwards,
3) the melt in the mold cavity 1 gradually cools and the pressure P1 decreases. When the pressure P1< P2, the intelligent controller 9 triggers the pushing device 8 to withdraw the plunger 7, the cooling liquid supply device stops cooling the pouring gate 3, and the plunger 7 returns to the original position (reset) to prepare for subsequent smooth ejection of the plastic part and the pouring system. After resetting, the plunger 7 can not block the cold material of the pouring gate 3, and the separation of the plastic part and the cold material of the pouring system can not be influenced. If a plurality of gates 3 (a mold with multiple cavities) are provided, the intelligent switch can be triggered commonly and jointly, so that the plurality of gates 3 can complete closing and opening actions simultaneously.
In order to reduce the frictional wear between the plunger 7 and the plunger mouth, the plunger 7 is prepared with a hardness designed to be 5 degrees lower than the plunger mouth so that the plunger 7 can be replaced when worn. And a plunger sleeve can be additionally arranged, so that the abrasion of the plunger 7 to the plunger opening is reduced. The plunger 7 is in clearance fit with the plunger mouth (plunger sleeve) such as H7/f7, and the melt overflow is prevented.
In light of the foregoing description of the preferred embodiment of the present invention, many modifications and variations will be apparent to those skilled in the art without departing from the spirit and scope of the invention. The technical scope of the present invention is not limited to the content of the specification, and must be determined according to the scope of the claims.
Claims (4)
1. A method for preventing a mold gate melt from flowing backwards adopts a mechanism for preventing the mold gate melt from flowing backwards, the mechanism comprises a mold cavity (1), a flow channel (2), a pouring gate (3) and a cooling pipeline (4) which are arranged in the mold, the mold cavity (1) and the flow channel (2) are communicated through the pouring gate (3), the cooling pipeline (4) surrounds the pouring gate (3), the cooling pipeline (4) is connected with a cooling liquid supply device outside the mold, a first pressure sensor (5) is arranged in the mold cavity (1) close to the pouring gate (3), a second pressure sensor (6) is arranged in the flow channel (2) close to the pouring gate (3), a backflow plunger (7) is further arranged in the mold, the plunger (7) is positioned above the pouring gate (3), a plunger opening is arranged on the pouring gate (3), the mechanism for preventing the mold gate melt further comprises a pushing device (8) and an intelligent controller (9), the lower extreme and the plunger mouth of plunger (7) are connected, and the upper end and the thrust unit (8) of plunger (7) are connected, first pressure sensor (5) and second pressure sensor (6) all with intelligent control ware (9) signal connection, coolant liquid feeding device and thrust unit (8) all with intelligent control ware (9) signal connection, thrust unit (8) do not work the time, plunger (7) are stifled in plunger mouth department, thrust unit (8) during operation, plunger (7) stretch into runner (3) and plug up runner (3), its characterized in that: the method comprises the following steps:
1) during injection molding, the injection machine quickly enters the polymer melt into the mold cavity (1) from the runner (2) through the pouring gate (3), and the melt is gradually solidified and cooled in the mold cavity (1);
2) in order to improve the injection efficiency, a screw rod of an injection machine rotates backwards to plasticize a high polymer material and prepare for the next injection molding piece, before the screw rod retreats, the pressure P1 measured by a first pressure sensor (5) arranged in a mold cavity (1) and close to a sprue (3) is lower than or equal to the pressure P2 measured by a second pressure sensor (6) arranged in a runner (2) and close to the sprue (3), once the screw rod retreats, negative pressure is formed in a charging barrel at the front end of the screw rod, the pressure P2 is smaller than the pressure P1, and melt in the mold cavity (1) tends to flow backwards due to pressure difference, flows backwards all the time from the mold cavity (1) through the sprue (3) and the runner (2), and then flows backwards through a nozzle of the injection machine and enters a space at the front end of the screw rod;
when the pressure P1 is larger than the pressure P2 and exceeds 0.01MPa, an intelligent controller (9) connected with the first pressure sensor (5) and the second pressure sensor (6) in a signal mode works to trigger a pushing device (8) to work to push a plunger (7) to block the pouring gate (3) so that the pouring gate (3) is temporarily closed, meanwhile, the intelligent controller (9) starts a cooling liquid supply device to work, cooling liquid is introduced into a cooling pipeline (4) to cool the pouring gate (3), the melt in the pouring gate (3) is rapidly frozen, and the melt in the mold cavity (1) is completely prevented from flowing backwards;
3) the melt in the mold cavity (1) is gradually cooled, the pressure P1 is reduced, when the pressure P1 is less than P2, the intelligent controller (9) triggers the pushing device (8) to withdraw the plunger (7), the cooling liquid supply device stops cooling the sprue (3), and the plunger (7) returns to the original position to prepare for subsequent smooth ejection of the plastic part and the pouring system.
2. The method of preventing mold gate melt backflow according to claim 1, wherein: the pushing device (8) adopts a cylinder, and the top end of a piston rod of the cylinder is connected with the upper end of the plunger (7).
3. The method of preventing mold gate melt backflow according to claim 1, wherein: the section of the sprue (3) is circular, the plunger (7) is sheet-shaped, and the surface of the plunger (7) is vertical to the axis of the sprue (3).
4. The method of preventing mold gate melt backflow according to claim 1, wherein: the section of the sprue (3) is square, the plunger (7) is sheet-shaped, and the surface of the plunger (7) is vertical to the length direction of the sprue (3).
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 |
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| Publication Number | Publication Date |
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| CN109228177A CN109228177A (en) | 2019-01-18 |
| CN109228177B true CN109228177B (en) | 2020-10-09 |
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| CN115302718B (en) * | 2022-08-24 | 2023-06-06 | 苏州迈创信息技术有限公司 | Forming die for security protection camera shell injection molding |
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| JPH0839645A (en) * | 1994-07-27 | 1996-02-13 | Mitsubishi Chem Corp | Molding of substrate for optical disk |
| JP2003145542A (en) * | 2001-11-07 | 2003-05-20 | Fuji Photo Film Co Ltd | Heat exchange device for mold |
| JP4182042B2 (en) * | 2004-10-01 | 2008-11-19 | 日精樹脂工業株式会社 | Method for preventing back flow of resin in injection device |
| 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 |
| KR101618362B1 (en) * | 2014-08-25 | 2016-05-04 | 한국교통대학교산학협력단 | Film insert molding apparatus applied injection-compression molding and the method thereof |
| CN207859369U (en) * | 2018-01-29 | 2018-09-14 | 东莞市福瑞旺精密模具科技有限公司 | A kind of anticlogging plastic injection mold |
| 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 |
| CN108437374A (en) * | 2018-04-08 | 2018-08-24 | 温州职业技术学院 | A kind of injection mold anti-backflow device |
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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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