CN117183237B - Firm sealed type double-gate mould for injection molding - Google Patents
Firm sealed type double-gate mould for injection molding Download PDFInfo
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- 238000001746 injection moulding Methods 0.000 title claims abstract description 38
- 238000002347 injection Methods 0.000 claims abstract description 184
- 239000007924 injection Substances 0.000 claims abstract description 184
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 82
- 239000003292 glue Substances 0.000 claims abstract description 77
- 239000004831 Hot glue Substances 0.000 claims abstract description 72
- 239000000243 solution Substances 0.000 claims abstract description 49
- 238000000034 method Methods 0.000 claims abstract description 33
- 230000008569 process Effects 0.000 claims abstract description 28
- 230000009471 action Effects 0.000 claims description 66
- 239000007789 gas Substances 0.000 claims description 42
- 239000007788 liquid Substances 0.000 claims description 22
- 238000000465 moulding Methods 0.000 claims description 21
- 238000003860 storage Methods 0.000 claims description 20
- 239000011261 inert gas Substances 0.000 claims description 14
- 238000012545 processing Methods 0.000 claims description 9
- 230000003068 static effect Effects 0.000 claims description 7
- 239000002243 precursor Substances 0.000 claims description 3
- 239000000523 sample Substances 0.000 claims description 3
- 238000006243 chemical reaction Methods 0.000 claims 2
- 230000008859 change Effects 0.000 abstract description 11
- 230000004075 alteration Effects 0.000 abstract description 7
- 230000005540 biological transmission Effects 0.000 abstract description 4
- 238000007789 sealing Methods 0.000 abstract description 3
- 238000001125 extrusion Methods 0.000 abstract description 2
- 244000062175 Fittonia argyroneura Species 0.000 description 5
- 239000000463 material Substances 0.000 description 4
- 239000002994 raw material Substances 0.000 description 3
- 230000009977 dual effect Effects 0.000 description 2
- 238000009434 installation Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 239000007787 solid Substances 0.000 description 2
- 241000287196 Asthenes Species 0.000 description 1
- 101100001674 Emericella variicolor andI gene Proteins 0.000 description 1
- 238000007792 addition Methods 0.000 description 1
- 238000013459 approach Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000006837 decompression Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 238000005457 optimization Methods 0.000 description 1
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- 238000000926 separation method Methods 0.000 description 1
- 238000007493 shaping process Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
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Abstract
The invention discloses a stable sealing type double-gate injection mold, which relates to the technical field of injection molds, and is based on the injection molding process of the injection mold, wherein gates in the injection mold are optimized firstly, and a double-gate structure is optimized, more specifically: the second injection port and the first-stage sprue component are used as conventional injection pouring channels, the compensation water port in the second-stage sprue component is mainly additionally arranged, the second-stage sprue component is not a normal injection pouring channel, but feeds back the glue solution change of the integral mould in hot glue solution injection according to the pressure change in the compensation water port, and the glue solution change is combined to a pressurizing gas transmission process of a pressurizing gas pipe to the compensation water port and a compensating glue injection process of the first injection port, and the purposes are that: the extrusion is performed inside the injection mold to avoid the quality problem of shrinkage cavity, and the flow form of the hot glue solution is promoted by limiting the internal pressure, so that the probability of quality problems such as chromatic aberration and the like caused by the difference of the flow speed of the hot glue solution is reduced.
Description
Technical Field
The invention relates to the technical field of injection molds, in particular to a stable and sealed mold for double-gate injection molding.
Background
The injection mold is a molding structure for injection and molding, in the use process, two modules in the mold are mutually close to each other to complete the sealing process, then hot glue liquid is injected into a molding cavity in the mold by using high-pressure glue injection equipment, a plastic product is obtained after the hot glue liquid is cooled and solidified, in order to avoid quality problems such as air holes, shrinkage cavities and the like of the product, the molding cavity in the mold is firstly required to be vacuumized, then hot glue liquid with constant pressure value, constant volume and constant temperature is injected according to technological parameters, and the position of a pouring gate (injection port) is arranged on a central point relative to the molding cavity, so that the hot glue liquid can be ensured to be uniformly and fully filled and flow into the molding cavity.
But it should be noted that: the raw materials (such as PE, PVC, PE) are melted to obtain liquid, the cooled plastic product is solid, the materials in the two forms are unchanged, but the density distribution in the two forms is different, such as: when the raw material in a liquid state is solidified from a liquid state to a solid state, the whole volume becomes small, so that the problem of water shortage may occur in the injection molded product after injection molding.
In addition, the current injection mold mainly adopts a single gate/runner structure, but for the injection process of a large-volume or complex injection product, the single gate/runner structure is difficult to meet the injection process, for example: the hot glue solution is injected into a closed space (forming cavity), when the hot glue solution is injected at constant pressure, the vacuum environment in the forming cavity is changed, the injection speed of the hot glue solution is directly or indirectly influenced, and the quality problems of chromatic aberration, weld marks, waves, silver threads and the like of the formed injection molding product are caused, or the problem of glue shortage caused by the fact that the hot glue solution cannot completely fill the inside of the integral forming cavity is solved.
Disclosure of Invention
The invention aims to provide a stable and sealed double-gate injection mold, which is used for solving the quality problems that a single gate structure adopted in the current injection mold cannot meet the production requirement of high quality, and the formed product is subjected to water shortage, glue shortage, chromatic aberration, weld marks, waves, silver threads and the like.
The aim of the invention can be achieved by the following technical scheme: the utility model provides a firm sealed double-gate mould for injection molding, includes movable mould board group and fixed mould board group, be provided with one stage runner subassembly on the position that the fixed mould board group is close to the movable mould board group, and install two stage runner subassemblies on the position that corresponds one stage runner subassembly on the fixed mould board group, be provided with a plurality of shaping die cavities on the fixed mould board group;
The first-stage sprue assembly comprises a water storage port, a main runner, a diversion port and a second injection molding port, the second injection molding port is positioned on the movable template group, the setting position of the second injection molding port is matched with the setting position of the water storage port, and the diversion port is communicated with the water storage port, the diversion port and the molding cavity through the main runner;
the two-stage pouring gate assembly comprises a compensating water gap, a pressure measuring air column, a pressure releasing pouring gate, a built-in air channel and a first injection molding port, wherein the first injection molding port is positioned on the movable template group, the setting position of the first injection molding port is matched with the setting position of the compensating water gap close to the split water gap, the forming cavity is communicated with the compensating water gap far away from the split water gap through the pressure releasing pouring gate, the compensating water gap close to the split water gap is communicated with the split water gap through the pressure releasing pouring gate, and the inside of the pressure measuring air column is communicated with the compensating water gap through the built-in air channel;
The pressure measuring gas column is provided with a pressurizing gas pipe, the pressure measuring gas column is provided with a gas pressure sensor, and a probe of the gas pressure sensor is positioned in the pressure measuring gas column.
Further provided is that: the diameter of the main flow runner is larger than that of the built-in air passage, the diameter of the built-in air passage is larger than that of the pressure release runner, and the diameter of the pressure release runner is smaller than that of the main flow runner.
Further provided is that: the volume of the compensation water gap is smaller than that of the diversion water gap, and the volume of the water storage water gap is larger than that of the diversion water gap.
Further provided is that: in the using process of the die, a die assembly, a glue injection assembly and an external control assembly are used, and the die assembly is used for driving the movable die plate group to move towards the fixed die plate group so as to complete die assembly actions of the movable die plate group and the fixed die plate group;
the glue injection assembly performs a sectional glue injection action through the first-stage pouring gate assembly and the second-stage pouring gate assembly;
The external control component is used for controlling and adjusting action parameters in the sectional glue injection action, and establishing a pressure self-checking system, wherein the pressure self-checking system consists of a data acquisition and recording module, a data processing module and a detail control module, the action parameters consist of static data and dynamic data, and the action parameters are acquired and recorded through the data acquisition and recording module.
Further provided is that: the static data comprise volume values in the first-stage pouring gate assembly and the second-stage pouring gate assembly and total glue injection amount in the sectional glue injection action, and the dynamic data comprise pressure values on the gas pressure sensor, glue injection pressure in the sectional glue injection action and output pressure on the pressurizing air pipe;
The data acquisition and recording module sends the action parameters to the data processing module, the data processing module takes the pressure value as a precursor parameter to generate a self-checking balance coefficient, the self-checking balance coefficient is sent to the detail control module, the detail control module controls action gaps in the sectional glue injection action and adjusts the action parameters through the self-checking balance coefficient, and the shrinkage coefficient between the volume value and the total glue injection amount is generated in the detail control module.
Further provided is that: in the operation process, the method comprises the following steps:
step one: the movable template group is attached and sealed with the fixed template group through the die assembly, and vacuumizing is carried out on the first-stage sprue assembly and the second-stage sprue assembly, wherein the pressure value on each gas pressure sensor is 0;
step two: before the sectional glue injection action is executed, the total glue injection amount is calculated according to the shrinkage coefficient, and the sectional glue injection action comprises a first stage and a second stage:
A stage of: injecting hot glue liquid injected in the sectional glue injection action into a forming cavity through a second injection port and a first-stage pouring gate assembly, wherein the pressure value on the air pressure sensor is in an increased state, calculating the pressure value on the air pressure sensor to generate a pressure jump value, and recording the glue injection amount in a first stage;
Two stages: when the pressure jump value reaches the self-checking balance coefficient, the injection pressure in the sectional injection action in one stage is degraded, inert gas is input into the compensating nozzle through a pressurizing air pipe to carry out pressurizing action, the output pressure of the inert gas is larger than the injection pressure in the sectional injection action, the injection quantity in the two stages is synchronously injected into the split nozzle through the first injection port, the sectional injection action in the one stage is continuously executed in the two stages, and the sum of the injection quantity in the one stage and the injection quantity in the two stages is equal to the total injection quantity.
The invention has the following beneficial effects:
The runner system based on the injection mold has the advantages that the structure of double gates is optimized unlike the current injection mold, the double gates take a second injection port and a one-stage gate component as the conventional injection runner as the technical basis, the structure corresponds to the single gate structure in the current injection mold, the optimized first injection port and two-stage gate component are based on the single gate structure and are mainly embodied in the structure of a compensating gate, and the concrete steps are as follows: the pressure change generated when hot glue solution is injected into the mold under the vacuum state is mainly detected through a pressure measuring air column on the compensation water gap, the compensation water gap is also used as a storage structure of the hot glue solution, and the hot glue solution in the compensation water gap is used as the supplementary glue solution in the forming cavity in the whole glue injection process without interference;
In combination with the content of the 1 st section, the whole glue injection process is divided into a stage and a two stage, the hot glue solution is mainly injected through a conventional injection runner in the first stage, in the glue injection process, a self-checking balance coefficient is generated according to pressure change in a pressure measuring air column, and the sectional glue injection actions in the two stages are synchronously started according to the self-checking balance coefficient. The compensation water gap is used as a 'storage' structure of hot glue liquid, the hot glue liquid is prevented from entering a pressure measuring air column on the basis of increasing pressure, on one hand, the hot glue liquid in a mould is maintained to be fully utilized for forming, on the other hand, the hot glue liquid stored in the compensation water gap is extruded by the pressure generated by the pressure measuring air column, and the hot glue liquid is forced to be injected into a forming cavity only, so that the problem of water shortage of an injection molding product is avoided;
Further described are: the self-checking balance coefficient needs to be generated based on static data in the die, and the purpose is as follows: based on the self condition of the mold, the flowing state of the hot glue solution in the mold is stabilized by limiting the glue injection pressure and the output pressure in the glue injection process, and the quality problems of chromatic aberration, weld marks, waves, silver threads and the like caused by the difference of flowing speeds are avoided.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic diagram of a mold for stable and sealed dual gate injection molding according to the present invention;
fig. 2 is a front view of a fixed die plate set in a stable and sealed dual gate injection mold according to the present invention.
In the figure: 1. a movable template group; 2. fixing the template group; 3. a gas pressure sensor; 4. pressure measuring gas column; 5. a pressurizing air pipe; 6. a first injection port; 7. a second injection port; 8. a molding cavity; 9. a main flow runner; 10. compensating a water gap; 11. a water storage port; 12. decompression pouring channel; 13. a built-in air passage; 14. and a split nozzle.
Detailed Description
The technical solutions of the present invention will be clearly and completely described in connection with the embodiments, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
Example 1
The present injection mold is designed according to design software (such as NX, solidworks), and is mainly used for designing a pouring gate structure and a molding cavity therein, and the operation principle is that molten raw materials are injected into the injection mold under high pressure, and then cooled, solidified and molded according to a waterway in the mold, so that a product with a corresponding appearance is obtained, while the present injection mold mainly adopts a single pouring gate/pouring gate structure, and for the injection process of large-volume or complex injection products, the single pouring gate/pouring gate structure is difficult to meet the actual injection molding requirement, so that the formed injection products have the quality problems of water shortage, chromatic aberration, weld marks, waves, silver threads and the like, and the following technical scheme is provided for the purpose:
Referring to fig. 1 and 2, a stable sealing type double-gate injection mold comprises a movable mold plate group 1 and a fixed mold plate group 2, wherein a first-stage gate component is arranged at a position, close to the movable mold plate group 1, of the fixed mold plate group 2, a second-stage gate component is arranged at a position, corresponding to the first-stage gate component, of the fixed mold plate group 2, and a plurality of molding cavities 8 are arranged on the fixed mold plate group 2;
the first-stage sprue assembly comprises a water storage port 11, a main runner 9, a diversion port 14 and a second injection molding port 7, wherein the second injection molding port 7 is positioned on the movable template group 1, the setting position of the second injection molding port 7 is matched with the setting position of the water storage port 11, and the diversion port 14 is communicated with the water storage port 11, the diversion port 14 and the molding cavity 8 through the main runner 9;
The two-stage sprue assembly comprises a compensating sprue 10, a pressure measuring air column 4, a pressure releasing runner 12, a built-in air passage 13 and a first injection molding opening 6, wherein the first injection molding opening 6 is positioned on the movable template group 1, the setting position of the first injection molding opening 6 is matched with the setting position of the compensating sprue 10 close to a split sprue 14, the molding cavity 8 is communicated with the compensating sprue 10 far away from the split sprue 14 through the pressure releasing runner 12, the compensating sprue 10 close to the split sprue 14 is communicated with the split sprue 14 through the pressure releasing runner 12, and the interior of the pressure measuring air column 4 is communicated with the compensating sprue 10 through the built-in air passage 13;
The pressurizing air pipe 5 is arranged on the pressure measuring air column 4, the gas pressure sensor 3 is arranged on the pressure measuring air column 4, and a probe of the gas pressure sensor 3 is positioned in the pressure measuring air column 4.
Basic operation principle: the first explanation of this embodiment is: regarding the movable platen set 1 and the fixed platen set 2, they are merely generic terms in the injection mold, and are used to replace the structures of the upper platen, the lower platen, the stripper plate, the ejector plate, etc. in the injection mold, while the movable platen set 1 is different from the fixed platen set 2 in that: in the current injection mold using process, various devices are needed to be utilized, wherein the movable template set 1 and the fixed template set 2 complete the injection molding process in the folding state, and the separation process of the movable template set 1 and the fixed template set 2 is used for taking down the injection molding product, so the movable template set 1 is a structure actively approaching to the fixed template set 2, the fixed template set 2 is fixedly installed, and the various devices described above are not repeated in the embodiment;
The embodiment needs to be described as follows: referring to fig. 1 and 2, the structural forms of the mold proposed in this embodiment are as follows: the first-stage gate component formed by the second injection port 7, the water storage port 11, the main runner 9 and the molding cavity 8 is used as a single gate structure, when the injection action is performed, hot glue liquid is injected into the molding cavity 8 along the second injection port 7, the water storage port 11 and the main runner 9, and an injection product is obtained after the hot glue liquid is cooled and solidified, which is the basic structure running of the injection mold, but the difference of the embodiment is that: the first injection port 6, the compensating port 10 and the pressure measuring gas column 4 are added to form a two-stage sprue assembly, and the two-stage sprue assembly is used as a second sprue structure form in the integral injection mold;
And it is to be explained again that: the first-stage pouring gate component and the second-stage pouring gate component are in a communicating state, but the two are in a mutually-influenced state, and the whole glue injection process is specifically described as follows: when the hot glue solution enters the forming cavity 8 along the second injection port 7, the water storage port 11 and the main flow runner 9, the hot glue solution also enters the compensating water port 10 to store part of the hot glue solution, and the form shown in fig. 2 is used for explaining, the form of fig. 2 in the invention cannot replace the structural form of all injection molds, wherein a one-stage pouring gate assembly formed by the second injection port 7, the water storage port 11, the main flow runner 9 and the forming cavity 8 is similar to the structural form of the current injection molds, the difference is that the setting position of the compensating water port 10 is mainly set according to the position of the forming cavity 8, so that the split water port 14 and the pressure measuring air column 4 are communicated through the compensating water port 10, and the hot glue solution is used as a 'storage' structure of the residual hot glue solution injected into the forming cavity 8;
Therefore, when hot glue solution is injected, the hot glue solution slowly gathers into the water diversion nozzle 10, and enters the water compensation nozzle 10 when continuously flowing into the forming cavity 8, and also flows back into the first injection molding opening 6, the glue injection process needs to be continuously performed again through the first injection molding opening 6, so that the hot glue solution is forced to enter the forming cavity 8, and similarly, the pressure measuring gas column 4 is used as a gas pressure detecting and outputting structure, the fact that the hot glue solution cannot be injected into the pressure measuring gas column 4 needs to be ensured, and the fact that inert gas is input into the pressure measuring gas column 4 by the pressurizing gas pipe 5 to pressurize the water compensation nozzle 10 is further needed, so that the hot glue solution is forced to enter the forming cavity 8 continuously.
Example two
The first embodiment is a method of locally optimizing a one-stage gate assembly and a two-stage gate assembly according to the first embodiment:
the diameter of the main runner 9 is larger than that of the built-in air passage 13, the diameter of the built-in air passage 13 is larger than that of the pressure relief runner 12, the diameter of the pressure relief runner 12 is smaller than that of the main runner 9, the volume of the compensating water gap 10 is smaller than that of the split water gap 14, and the volume of the water storage gap 11 is larger than that of the split water gap 14.
The technical advantages are that: as for the technical content of the first embodiment, it is ensured that the hot glue in the split nozzle 14 can be injected into the molding cavity 8 as well as the compensating nozzle 10, but the basic principle of the injection mold is to obtain an injection molding product, and it is theoretically required to ensure that the hot glue is "completely" injected into the molding cavity 8, but the structure of the compensating nozzle 10 belongs to the key structure in the present invention, and for this purpose, when the hot glue is ensured to be injected into the compensating nozzle 10, the diameter of the pressure release runner 12 needs to be limited, and the hot glue amount injected into the compensating nozzle 10 needs to be reduced, so that the problem of excessive hot glue waste is avoided.
Example III
The present embodiment combines the usage mode and the operation principle of the injection mold, and makes the following optimization scheme according to the technical content presented in the first embodiment and the second embodiment:
In the using process of the die, a die assembly component, a glue injection component and an external control component are used, and the die assembly component is used for driving the movable die plate group 1 to move towards the fixed die plate group 2 to finish the die assembly action of the movable die plate group 1 and the fixed die plate group 2;
the glue injection assembly performs a sectional glue injection action through the first-stage pouring gate assembly and the second-stage pouring gate assembly;
The external control component is used for controlling and adjusting action parameters in the sectional glue injection action, and establishing a pressure self-checking system, wherein the pressure self-checking system consists of a data acquisition and recording module, a data processing module and a detail control module, the action parameters consist of static data and dynamic data, and the action parameters are acquired and recorded through the data acquisition and recording module.
The static data comprise the volume values of the first-stage pouring gate assembly and the second-stage pouring gate assembly and the total glue injection amount in the sectional glue injection action, and the dynamic data comprise the pressure value of the gas pressure sensor 3, the glue injection pressure in the sectional glue injection action and the output pressure of the pressurizing air pipe 5;
The data acquisition and recording module sends the action parameters to the data processing module, the data processing module takes the pressure value as a precursor parameter to generate a self-checking balance coefficient, the self-checking balance coefficient is sent to the detail control module, the detail control module controls action gaps in the sectional glue injection action and adjusts the action parameters through the self-checking balance coefficient, and the shrinkage coefficient between the volume value and the total glue injection amount is generated in the detail control module.
In the operation process, the method comprises the following steps:
Step one: the movable template group 1 is attached and sealed with the fixed template group 2 through the die assembly, and the first-stage pouring gate assembly and the second-stage pouring gate assembly are vacuumized, wherein the pressure value on each gas pressure sensor 3 is 0;
step two: before the sectional glue injection action is executed, the total glue injection amount is calculated according to the shrinkage coefficient, and the sectional glue injection action comprises a first stage and a second stage:
A stage of: the hot glue injected in the sectional glue injection action is injected into a forming cavity 8 through a second injection port 7 and a first-stage pouring gate component, the pressure value on the air pressure sensor 3 is in an increased state, the pressure value on the air pressure sensor 3 is calculated to generate a pressure jump value, and the glue injection amount in a first stage is recorded;
Two stages: when the pressure jump value reaches the self-checking balance coefficient, the injection pressure in the sectional injection action in one stage is degraded, inert gas is input into the compensating nozzle 10 through the pressurizing air pipe 5 for pressurizing action, the output pressure of the inert gas is larger than the injection pressure in the sectional injection action, the injection quantity in the two stage is synchronously injected into the shunting nozzle 14 through the first injection port 6, the sectional injection action in the one stage is continuously executed in the two stage, and the sum of the injection quantity in the one stage and the injection quantity in the two stages is equal to the total injection quantity.
The scheme is as follows: the embodiment is based on the die structure provided by the invention, and provides the following system description, and the specific contents are as follows:
According to the use process of the injection mold, the embodiment mainly aims at the mold clamping assembly, the glue injection assembly and the external control assembly, when beginning to inject glue, the first-stage gate assembly and the second-stage gate assembly are vacuumized, so as shown above, the pressure value on each gas pressure sensor 3 is 0, and the sum of the volumes of the first-stage gate assembly and the second-stage gate assembly can be directly obtained by utilizing the volume calculation command in design software (such as NX, solidworks), and the total glue injection amount is converted according to the shrinkage coefficient by combining the material characteristics used in the injection product, such as: Therein, wherein Is the total amount of the injected glue,Is a coefficient of shrinkage,Is the sum of the volumes of the first-stage sprue component and the second-stage sprue component,Is the density of hot glue solution and、AndObtained according to the production requirement, thereby obtaining the calculatedIs of a relatively fixed value, so that when the glue injection assembly executes the sectional glue injection action, the injected hot glue liquid amount is；
In combination with 1), when the gas is injected into the vacuum environment, taking inert gas as an example, the inert gas will not disappear in the vacuum environment, because no external pressure exists in the vacuum environment, the inert gas will expand according to the nature of the inert gas, because the gas expands, the inert gas will expand outwards, so that the situation can be understood that the vacuum environment has the pressure, and the pressure value on the gas pressure sensor 3 increases from 0, which is the key technical basis of the embodiment;
The process of injecting the hot glue liquid is mainly an injection process of "forcing" the hot glue liquid under the high-pressure condition, and the specific volumes of the first injection port 6, the compensation water port 10 and the pressure release pouring channel 12 are marked by combining the content of 2), and are respectively marked as follows: 、、 And the hot glue solution is combined in the injection diverting nozzle 14 and also enters the compensating nozzle 10 respectively, for which the glue solution needs to be added 、AndFrom the slaveThe middle part is sieved, and then the volume comprehensive value of the rest structure positions in the die isBut here it is necessary to ensure that the hot glue cannot be injected into the manometric column 4, so for、Performing drop formationAndIt is to be explained for this: the critical value of the volume of the hot glue solution injected into the first injection port 6 isThe critical value of the hot glue volume of the filling compensating nozzle 10 isThe purpose is to avoid hot glue solution entering the built-in air channel 13 or overflowing from the first injection molding opening 6;
in combination with 3), according to the number of the built-in air passages 13 and the number of the split water ports 14, the actual volume comprehensive value of the rest structure positions in the die is Therein, whereinFor the number of settings of the built-in air duct 13,For the number of the split nozzles 14, the number of the split nozzles 14 is equal to the number of the first injection ports 6, and then the calculation formula in the process of converting the internal pressure of the mold is converted:， A specific value that is the sum of the volumes of the one-stage gate assembly and the two-stage gate assembly;
And establishing a calculation formula of the pressure jump value again: Therein, wherein Is the value displayed on the gas pressure sensor 3 in the step-by-step injection, and is used herein to represent the pressure jump valueFor the actual injection amount in the sectional injection action,To convert constant, the essence is to convert the volume change in the closed space inside the mold to obtain pressure value, andIs used for feeding back the pressure jump value in actual condition, and is combined with the pressure jump value againAndThese two values, the phenomenon of feedback is: the hot glue solution is completely filled into the split water gap 14, and the hot glue solution is injected into the forming cavity 8, and also respectively enters the compensating water gap 10 and the first injection molding opening 6, so that the change of the hot glue solution in the first injection molding opening 6 is neglected, specifically, the volume change in the compensating water gap 10 is neglected, and the hot glue solution is supposed to be filled into the compensating water gap 10 and the volume reachesThis value can be understood as: the compensating nozzle 10 and the built-in air passage 13 are taken as a whole, and the volume of the built-in air passage 13 is marked asThen the sum of the volumes of the two isAnd is substituted intoGeneratingCalculated and obtainedAnd then establishing a calculation formula of a self-checking balance coefficient for an intermediate value in the pressure jump value: the essence is that the value detected by the gas pressure sensor 3 gradually approaches Until the two are equal, thereby setting self-checking balance coefficientIs 0;
In combination with the 5) point content, in At > 0, a phase is performed, and at G < 0 or g=0, then the phase can be used as a switching point for the phase and the two phases, for replacing the action gap, specifically: the injection pressure being of constant value in one stageThe amount of hot glue solution injected isIn the two stages, therefore, firstly, inert gas needs to be injected into the pressure measuring gas column 4 through the pressurizing gas pipe 5 to carry out gas transmission pressurization on the pressure measuring gas column 4 and the compensating water gap 10, and the pressurizing pressure value needs to be ensured to be larger thanThe amount of hot glue needed to be replenished in the two stages isAnd in the two stages, the first injection port 6 and the second injection port 7 perform the injection action at the same time, but it is necessary to reduce the injection pressure during the injection processThe specific reduction values are: The remaining part of the hot glue is caused to be injected into the die again at a steady speed, the purpose of which is: the flow rate of the hot glue solution is reduced by reducing the glue injection pressure in cooperation with the former part of the hot glue solution after the glue injection action is finished, so that the hot glue solution injected later and the former part of the hot glue solution cannot generate excessive impact, the quality problems of chromatic aberration, welding marks (lines), waves, silver threads and the like are avoided, and the hot glue solution is further forced to be injected into the forming cavity 8 in an inert gas output mode;
in view of the above, the installation position of the compensating nozzle 10 corresponds not only to the pressure-measuring gas column 4 but also to the molding cavity 8, and each pressure-measuring gas column 4 is numbered according to the installation position of the compensating nozzle 10, which is described more specifically: in the above 6), it is necessary to rely on the display value on the gas pressure sensor 3 near the diverting nozzle 14, because the compensating nozzle 10 at this position is at a middle position in the injection process, and the hot glue solution needs to pass through the compensating nozzle 10 at this position when entering the molding cavity 8, further explaining: the display value on the gas pressure sensor 3 at the position close to the molding cavity 8 is not used as the reference data in the content of 6), but the rear end position required as the whole glue injection operation can be understood as follows: when all hot glue liquid is completely injected into a first-order pouring gate component and a second-order pouring gate component, if water is lack in a forming cavity 8, no sufficient hot glue liquid exists in a compensating water gap 10 corresponding to the forming cavity 8, so that the display numerical value of a gas pressure sensor 3 at a numbering position is substituted into And judging whether the whole glue injection action is finished or not, and the same is true: the hot glue liquid of the compensating water gap 10 is 'replenished' into the forming cavity 8 by the gas transmission pressurizing process of the pressurizing air pipe 5.
To sum up: based on injection mold's injecting glue process, optimize the runner in the injection mold at first, optimize out two runner structures, more specifically say: the second injection port and the first-stage sprue component are used as conventional injection pouring channels, the compensation water port in the second-stage sprue component is mainly additionally arranged, the second-stage sprue component is not a normal injection pouring channel, but feeds back the glue solution change of the integral mould in hot glue solution injection according to the pressure change in the compensation water port, and the glue solution change is combined to a pressurizing gas transmission process of a pressurizing gas pipe to the compensation water port and a compensating glue injection process of the first injection port, and the purposes are that: the extrusion is performed inside the injection mold to avoid the quality problem of shrinkage cavity, and the flow form of the hot glue solution is promoted by limiting the internal pressure, so that the probability of quality problems such as chromatic aberration and the like caused by the difference of the flow speed of the hot glue solution is reduced.
The foregoing is merely illustrative and explanatory of the invention, as it is well within the scope of the invention as claimed, as it relates to various modifications, additions and substitutions for those skilled in the art, without departing from the inventive concept and without departing from the scope of the invention as defined in the accompanying claims.
In the description of the present specification, the descriptions of the terms "one embodiment," "example," "specific example," and the like, mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present invention. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiments or examples. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
The preferred embodiments of the invention disclosed above are intended only to assist in the explanation of the invention. The preferred embodiments are not intended to be exhaustive or to limit the invention to the precise form disclosed. Obviously, many modifications and variations are possible in light of the above teaching. The embodiments were chosen and described in order to best explain the principles of the invention and the practical application, to thereby enable others skilled in the art to best understand and utilize the invention. The invention is limited only by the claims and the full scope and equivalents thereof.
Claims (3)
1. The utility model provides a firm sealed double-gate mould for injection molding, includes movable mould board group (1) and fixed mould board group (2), its characterized in that, be provided with one stage runner subassembly on the position that fixed mould board group (2) is close to movable mould board group (1), and install two stage runner subassemblies on the position that corresponds one stage runner subassembly on fixed mould board group (2), be provided with a plurality of molding die cavities (8) on fixed mould board group (2);
the one-stage sprue assembly comprises a water storage port (11), a main runner (9), a diversion water port (14) and a second injection molding port (7), wherein the second injection molding port (7) is positioned on the movable template group (1), the setting position of the second injection molding port (7) is matched with the setting position of the water storage port (11), and the diversion water port (14) is communicated with the water storage port (11), the diversion water port (14) and the forming cavity (8) through the main runner (9);
The two-stage pouring gate assembly comprises a compensation water gap (10), a pressure measuring air column (4), a pressure reducing pouring gate (12), a built-in air channel (13) and a first injection molding opening (6), wherein the first injection molding opening (6) is positioned on a movable template group (1), the setting position of the first injection molding opening (6) is matched with the setting position of the compensation water gap (10) close to a split water gap (14), the molding cavity (8) is communicated with the compensation water gap (10) far away from the split water gap (14) through the pressure reducing pouring gate (12), the compensation water gap (10) close to the split water gap (14) is communicated with the split water gap (14) through the pressure reducing pouring gate (12), and the interior of the air column (4) is communicated with the compensation water gap (10) through the built-in air channel (13);
A pressurizing air pipe (5) is arranged on the pressure measuring air column (4), a gas pressure sensor (3) is arranged on the pressure measuring air column (4), and a probe of the gas pressure sensor (3) is positioned in the pressure measuring air column (4);
in the using process of the die, a die assembly, a glue injection assembly and an external control assembly are used, and the die assembly is used for driving the movable die plate group (1) to move towards the fixed die plate group (2) to finish the die assembly action of the movable die plate group (1) and the fixed die plate group (2);
the glue injection assembly performs a sectional glue injection action through the first-stage pouring gate assembly and the second-stage pouring gate assembly;
The external control component is used for controlling and adjusting action parameters in the sectional glue injection action, and establishing a pressure self-checking system, wherein the pressure self-checking system consists of a data acquisition and recording module, a data processing module and a detail control module, the action parameters consist of static data and dynamic data, and the action parameters are acquired and recorded through the data acquisition and recording module;
the static data comprise volume values in the first-stage pouring gate assembly and the second-stage pouring gate assembly and total glue injection amount in the sectional glue injection action, and the dynamic data comprise pressure values on the gas pressure sensor (3), glue injection pressure in the sectional glue injection action and output pressure on the pressurizing air pipe (5);
The data acquisition and recording module sends the action parameters to the data processing module, the data processing module takes the pressure value as a precursor parameter to generate a self-checking balance coefficient, the self-checking balance coefficient is sent to the detail control module, the detail control module controls action gaps in the sectional glue injection action and adjusts the action parameters through the self-checking balance coefficient, and a shrinkage coefficient between the volume value and the total glue injection amount is generated in the detail control module;
In the operation process, the method comprises the following steps:
Step one: the movable template group (1) is attached and sealed with the fixed template group (2) through the die assembly, the first-stage pouring gate assembly and the second-stage pouring gate assembly are vacuumized, and the pressure value on each gas pressure sensor (3) is 0;
step two: before the sectional glue injection action is executed, the total glue injection amount is calculated according to the shrinkage coefficient, and the sectional glue injection action comprises a first stage and a second stage:
A stage of: the hot glue injected in the sectional glue injection action is injected into a forming cavity (8) through a second injection port (7) and a one-stage pouring gate component, the pressure value on the air pressure sensor (3) is in an increasing state, the pressure value on the air pressure sensor (3) is calculated to generate a pressure jump value, the glue injection quantity in one stage is recorded, and a conversion formula of a shrinkage coefficient and the total glue injection quantity is established: ， Is the total amount of the injected glue, Is a coefficient of shrinkage,Is the sum of the volumes of the first-stage sprue component and the second-stage sprue component,Is the density of the hot glue solution、AndFor relative fixed value, the volumes of the first injection molding port (6), the compensating water port (10) and the pressure release pouring channel (12) are marked as follows、、The critical value of the volume of the hot glue liquid injected into the first injection port (6) isThe critical value of the hot glue volume of the injection compensation water gap (10) isThe calculation formula in the process of the internal pressure conversion of the die is as follows:， A specific value that is the sum of the volumes of the one-stage gate assembly and the two-stage gate assembly;
Two stages: establishing a calculation formula of the pressure jump value: ， for the purpose of indicating the pressure jump value, For the actual injection amount in the sectional injection action,To convert constant, the volume of the built-in airway (13) is marked asWill beSubstituted intoGeneratingCalculated and obtained，Establishing a calculation formula of a self-checking balance coefficient for an intermediate value in the pressure jump value: In the following At > 0, a phase is performed; at G < 0 or g=0, as a switching point for the one and two phases;
when the pressure jump value reaches the self-checking balance coefficient, the injection pressure in the sectional injection action in one stage is degraded, inert gas is input into the compensating water gap (10) through the pressurizing air pipe (5) for pressurizing action, the output pressure of the inert gas is larger than the injection pressure in the sectional injection action, the injection quantity in the two stages is synchronously injected into the shunting water gap (14) through the first injection port (6), the sectional injection action in one stage is continuously executed in the two stages, and the sum of the injection quantity in the one stage and the injection quantity in the two stages is equal to the total injection quantity.
2. The stable sealed double-gate injection mold according to claim 1, wherein the diameter of the main runner (9) is larger than the diameter of the built-in air passage (13), the diameter of the built-in air passage (13) is larger than the diameter of the pressure release runner (12), and the diameter of the pressure release runner (12) is smaller than the diameter of the main runner (9).
3. The stable sealed double gate injection mold according to claim 1, wherein the volume of the compensating nozzle (10) is smaller than the volume of the diverting nozzle (14), and the volume of the water storage nozzle (11) is larger than the volume of the diverting nozzle (14).
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| Application Number | Priority Date | Filing Date | Title |
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| CN202311038487.8A CN117183237B (en) | 2023-08-17 | 2023-08-17 | Firm sealed type double-gate mould for injection molding |
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Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2009112387A1 (en) * | 2008-03-11 | 2009-09-17 | Basf Se | Method and apparatus for injection-molding hollow plastic articles |
| KR20100004000A (en) * | 2008-07-02 | 2010-01-12 | 주식회사우리엠텍 | Injection molder for enabling uniform filling in many cavities and injection method using this |
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Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2009112387A1 (en) * | 2008-03-11 | 2009-09-17 | Basf Se | Method and apparatus for injection-molding hollow plastic articles |
| KR20100004000A (en) * | 2008-07-02 | 2010-01-12 | 주식회사우리엠텍 | Injection molder for enabling uniform filling in many cavities and injection method using this |
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