CN114030140A - Hot runner unit, injection molding system and control method of injection molding system - Google Patents
Hot runner unit, injection molding system and control method of injection molding system Download PDFInfo
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- CN114030140A CN114030140A CN202110012581.0A CN202110012581A CN114030140A CN 114030140 A CN114030140 A CN 114030140A CN 202110012581 A CN202110012581 A CN 202110012581A CN 114030140 A CN114030140 A CN 114030140A
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- 238000001746 injection moulding Methods 0.000 title claims abstract description 49
- 238000000034 method Methods 0.000 title claims abstract description 23
- 238000002347 injection Methods 0.000 claims abstract description 105
- 239000007924 injection Substances 0.000 claims abstract description 105
- 239000012530 fluid Substances 0.000 claims abstract description 102
- 238000012545 processing Methods 0.000 claims description 19
- 238000003780 insertion Methods 0.000 claims description 9
- 230000037431 insertion Effects 0.000 claims description 9
- 230000002093 peripheral effect Effects 0.000 claims description 6
- 238000004891 communication Methods 0.000 claims description 4
- 238000001514 detection method Methods 0.000 claims description 4
- 238000002844 melting Methods 0.000 claims description 3
- 230000008018 melting Effects 0.000 claims description 3
- 239000002245 particle Substances 0.000 claims description 3
- 230000032683 aging Effects 0.000 abstract description 8
- 238000005299 abrasion Methods 0.000 abstract description 4
- 238000007789 sealing Methods 0.000 description 6
- 239000000463 material Substances 0.000 description 5
- 230000007547 defect Effects 0.000 description 4
- 239000000203 mixture Substances 0.000 description 4
- 239000000243 solution Substances 0.000 description 3
- 238000009413 insulation Methods 0.000 description 2
- 210000001503 joint Anatomy 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 239000003292 glue Substances 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 239000011347 resin Substances 0.000 description 1
- 229920005989 resin Polymers 0.000 description 1
- 238000007493 shaping process Methods 0.000 description 1
- 230000007704 transition Effects 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
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Classifications
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- 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
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- 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
- B29C45/76—Measuring, controlling or regulating
- B29C45/77—Measuring, controlling or regulating of velocity or pressure of moulding material
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- 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
- B29C2945/00—Indexing scheme relating to injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould
- B29C2945/76—Measuring, controlling or regulating
- B29C2945/76003—Measured parameter
- B29C2945/76006—Pressure
-
- 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
- B29C2945/00—Indexing scheme relating to injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould
- B29C2945/76—Measuring, controlling or regulating
- B29C2945/76494—Controlled parameter
- B29C2945/76498—Pressure
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- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Mechanical Engineering (AREA)
- Moulds For Moulding Plastics Or The Like (AREA)
- Injection Moulding Of Plastics Or The Like (AREA)
Abstract
The invention discloses a hot runner unit, which comprises a fixed template and a flow distribution plate, wherein a nozzle is arranged on the fixed template, the nozzle comprises a nozzle body, a main runner is arranged in the nozzle body, the flow distribution plate comprises a flow distribution plate body, a flow distribution channel communicated with the main runner is arranged in the flow distribution plate body, and a pressure sensor is arranged in the flow distribution channel. According to the invention, the pressure of the sub-channel is detected by the pressure sensor, the pressure of the sub-channel is compared with the injection pressure applied to the screw, and the injection pressure is adjusted to enable the pressure of hot fluid in the sub-channel to meet the requirements of injection molding process parameters of a mold, so that the influence of injection pressure loss caused by the abrasion and aging of parts of an injection unit on the product quality is avoided, meanwhile, the abrasion and aging degree of the parts of the injection unit is monitored, and early warning of the initial fault occurrence is realized. The invention also discloses an injection molding system with the hot runner unit. The invention also discloses a control method of the thermal injection molding system.
Description
Technical Field
The invention belongs to the technical field of plastic injection molding, and particularly relates to a hot runner unit, an injection molding system and a control method of the injection molding system.
Background
The injection molding is to send the granular or powdery fiber-resin mixture into a charging barrel, heat and melt the mixture, pressurize the mixture by a plunger or a screw, inject the mixture into a closed die with reduced temperature through a nozzle, and obtain the plastic product after cooling and shaping, wherein the injection pressure is the most important technological parameter of the injection molding, and the accuracy of the injection pressure plays a key role in the quality of the plastic product, the stability of the production process, the solution of the injection molding defect and the like.
However, due to the problems of wear and aging of parts of the injection unit, uncertain faults, pressure loss of the butt joint of a nozzle of the injection unit and a mold and the like, accurate output of injection pressure is influenced, deviation between the displayed injection pressure and the injection pressure set by injection molding process parameters is caused, and defects of sink marks, deformation, size deviation and the like of plastic products occur.
For example, chinese patent discloses a hot runner system for injection molding, comprising: the hot nozzle comprises a main flow channel, a flow distribution plate, a hot nozzle and a controller, wherein a first pressure pump for pushing hot fluid to move is connected to the main flow channel; the flow distribution plate is arranged below the main flow channel and comprises a confluence channel butted with the main flow channel and a plurality of flow distribution channels branched from the confluence channel, and the flow distribution channels are provided with second pressure pumps; the hot nozzle is connected below each branch runner, and a pressure sensor is arranged in the hot nozzle and used for pressurizing the pressure of hot fluid flowing into the hot nozzle so as to meet the requirements of an injection molding process, but the injection pressure loss cannot be reflected.
The present invention has been made in view of this situation.
Disclosure of Invention
The technical problem to be solved by the invention is to overcome the defects of the prior art and provide a hot runner unit so as to realize the purpose of detecting the pressure of hot fluid in a sub-runner in real time by a pressure sensor.
In order to solve the technical problems, the invention adopts the technical scheme that:
the utility model provides a hot runner unit, includes fixed die plate and flow distribution plate, is equipped with the nozzle on the fixed die plate, and the nozzle includes the nozzle body, and this internal sprue that is equipped with of nozzle, flow distribution plate include the flow distribution plate body, and this internal subchannel that is equipped with the intercommunication sprue of flow distribution plate installs pressure sensor in the subchannel.
Furthermore, the sub-runner is provided with a port, a plug for sealing the port of the sub-runner is installed on the main body of the sub-runner, a through hole is formed in the plug and communicated with the sub-runner, and the pressure sensor penetrates out of the through hole and is arranged in the sub-runner.
Furthermore, the mounting hole has been seted up on the flow distribution plate body, and the end cap includes the grafting portion that inserts the subchannel from the mounting hole, and grafting portion and subchannel periphery are laminated mutually, and pressure sensor's sense terminal wears out from grafting portion and arranges in the subchannel.
Furthermore, the plug also comprises a protruding part arranged on the outer side of the flow distribution plate body, the radial size of the protruding part is larger than the diameter of the mounting hole, the protruding part is attached to the flow distribution plate body on the outer peripheral side of the mounting hole, and a signal output end of the pressure sensor penetrates out of the protruding part.
Still another objective of the present invention is to provide an injection molding system, so as to achieve the purpose that the data processing unit receives the hot fluid pressure in the sub-channel transmitted by the pressure sensor in real time, so as to adjust the injection pressure to meet the parameter requirement of the injection molding process.
An injection molding system with any one of the hot runner units, further comprising an injection unit and a data processing unit, wherein the injection unit comprises a material cylinder, a screw and a screw control device, one end of the material cylinder is connected with a nozzle, and the screw control device is connected with the screw; the data processing unit is respectively in communication connection with the pressure sensor and the screw control device.
Still another object of the present invention is to provide a control method of a hot runner system, so as to achieve the purpose of adjusting the injection pressure and/or injection speed by the hot fluid pressure feedback in the sub-runners.
A control method applied to the injection molding system comprises the following steps:
melting plastic particles in a charging barrel to obtain hot fluid;
determining a target injection pressure P0, a target injection velocity V0 and a target thermal fluid pressure P0' in the sub-channel;
controlling the screw to push the hot fluid to flow into the sub-runners through the main runner based on the target injection pressure P0 and the target injection speed V0, and obtaining the actual hot fluid pressure P in the sub-runners;
judging the actual hot fluid pressure P and the target hot fluid pressure P0 ', and if P is equal to P0', entering a pressure maintaining stage by the branch channel; if P is less than P0 ', adjusting the injection pressure P0 to be P1 and/or the injection speed V0 to be V1, and obtaining the hot fluid pressure P in the sub-channel again until P is equal to P0', and then the sub-channel enters the pressure maintaining stage.
Further, the data processor receives the hot fluid pressure data in the sub-channel transmitted by the pressure sensor, and stores a hot fluid pressure curve and an injection pressure curve which are formed based on the hot fluid pressure data in the sub-channel in a correlation mode.
Further, the determining the actual thermal fluid pressure P and the target thermal fluid pressure P0 ', if P is less than P0', further includes:
increasing the injection speed V0 to be V1, controlling the screw to push the hot fluid to flow into the sub-runners through the main runner based on the injection speed V1 and the target injection pressure P0, obtaining the hot fluid pressure P in the sub-runners again, and forming a hot fluid pressure curve by the data processor based on the hot fluid pressure data in the sub-runners and the injection speed.
Further, the method also comprises the following steps: at the same injection pressure, the hot fluid pressure in the same feed sub-channels remains constant as the rate of increase of the injection velocity.
Further, after the branch channel enters the pressure maintaining stage, the method further comprises the following steps:
after the pressure maintaining time T, judging the actual hot fluid pressure P and the target hot fluid pressure P0 ', and if P is more than or equal to P0', executing injection molding operation; if P is less than P0 ', the injection pressure is increased until P is greater than or equal to P0' after the dwell time T.
After the technical scheme is adopted, compared with the prior art, the invention has the following beneficial effects.
1. According to the invention, the pressure of the sub-channel is detected by the pressure sensor, the pressure of the sub-channel is compared with the injection pressure applied to the screw, and the injection pressure is adjusted to enable the pressure of hot fluid in the sub-channel to meet the requirements of injection molding process parameters of a mold, so that the influence of injection pressure loss caused by the abrasion and aging of parts of an injection unit on the product quality is avoided, meanwhile, the abrasion and aging degree of the parts of the injection unit is monitored, and early warning of the initial fault occurrence is realized.
2. According to the invention, the pressure sensor reports the hot fluid pressure data in the sub-channel to the data processing unit, the data processing unit compares the hot fluid pressure data in the sub-channel with the injection pressure data applied to the screw, and the data processing unit can send a signal to the screw control device to control the injection pressure and/or the injection speed so that the hot fluid pressure in the sub-channel meets the required technological parameter requirements of mold injection molding, and can form empirical data to realize self-learning.
3. According to the invention, a pressure curve is formed by collecting hot fluid pressure data in the sub-runner, and the pressure curve is compared with an injection pressure curve of injection molding equipment to assist in debugging process pressure parameters of a mold, so that the hot fluid pressure in the sub-runner meets the process parameters required by mold injection molding.
The following describes embodiments of the present invention in further detail with reference to the accompanying drawings.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention, are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the invention without limiting the invention to the right. It is obvious that the drawings in the following description are only some embodiments, and that for a person skilled in the art, other drawings can be derived from them without inventive effort. In the drawings:
FIG. 1 is a schematic structural view of a hot runner unit in an embodiment of the present invention;
FIG. 2 is a front view of a hot runner unit in an embodiment of the present invention;
FIG. 3 is a cross-sectional view taken along line A-A of FIG. 2;
fig. 4 is a partially enlarged view at B in fig. 3.
In the figure: 1. fixing a template; 2. a flow distribution plate; 21. a diverter plate body; 22. a shunt channel; 221. a pressure sensor; 2211. a detection end; 2212. an output end; 222. a pressure sensor support; 23. a plug; 231. a plug-in part; 232. a protrusion; 24. a first seal ring; 25. a second seal ring; 26. a third seal ring; 27. a fourth seal ring; 28. an internal thread plug; 29. an external thread plug; 4. a liquid discharge pipe; 5. a first cushion block; 6. a second cushion block; 7. a nozzle; 71. a nozzle body; 72. a main flow channel; 8. a hot nozzle; 10. and a mold core.
It should be noted that the drawings and the description are not intended to limit the scope of the inventive concept in any way, but to illustrate it by a person skilled in the art with reference to specific embodiments.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and the following embodiments are used for illustrating the present invention and are not intended to limit the scope of the present invention.
In the description of the present invention, it should be noted that the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "inner", "outer", etc., indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention.
In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; may be directly connected or indirectly connected through an intermediate. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
Example one
As shown in fig. 1 to 4, the present embodiment provides a hot runner unit, which includes a fixed mold plate 1 and a splitter plate 2, a nozzle 7 is disposed on the fixed mold plate 1, the nozzle 7 includes a nozzle body 71, a main runner 72 is disposed in the nozzle body 71, the splitter plate 2 includes a splitter plate body 21, a splitter channel 22 communicating with the main runner 72 is disposed in the splitter plate body 21, a pressure sensor 221 is disposed in the splitter channel 22 and used for detecting a hot fluid pressure in the splitter channel 22, and further comparing the hot fluid pressure in the splitter channel 22 with an injection pressure applied to a screw, the injection pressure is adjusted to make the hot fluid pressure in the splitter channel 22 meet requirements of mold injection molding process parameters, and product quality is prevented from being affected by injection pressure loss due to wear and aging of components of an injection unit.
As shown in fig. 3 and 4, in this embodiment, the branch channel 22 has a port, a plug 23 for sealing the port of the branch channel 22 is installed on the branch plate body 21, a through hole is formed in the plug 23, the through hole is communicated with the branch channel 22, and the pressure sensor 221 penetrates through the through hole and is disposed in the branch channel 22. The plug 23 enables the port of the sub-runner 22 to be in smooth transition, so that the hot fluid in the sub-runner 22 can flow more smoothly, the flowing path of the hot fluid in the sub-runner 22 is reduced, the phenomenon of glue leakage or material waste is avoided, and the pressure sensor 221 is embedded into the sub-runner 22 through the plug 23, so that the pressure of the hot fluid in the sub-runner 22 can be detected in real time, and the pressure sensor 221 is convenient to install and maintain.
As shown in fig. 3 and 4, in this embodiment, the diversion plate body 21 is provided with a mounting hole, the plug 23 includes an insertion portion 231 inserted into the diversion channel 22 from the mounting hole, the insertion portion 231 is attached to the outer peripheral wall of the diversion channel 22, and the detection end 2211 of the pressure sensor 221 penetrates out of the insertion portion 231 and is disposed in the diversion channel 22.
As shown in fig. 3 and 4, in this embodiment, the insertion portion 231 is attached to the outer peripheral wall of the branch channel 22 to prevent the thermal fluid in the branch channel 22 from leaking through the gap between the insertion portion 231 and the branch channel 22, and the detection end 2211 of the pressure sensor 221 penetrates out of the insertion portion 231 and can be more stably disposed in the branch channel 22.
As shown in fig. 3 and 4, the plug 23 further includes a protruding portion 232 disposed outside the flow distribution plate body 21, a radial dimension of the protruding portion 232 is larger than a diameter of the mounting hole, the protruding portion 232 is attached to the flow distribution plate body 21 on an outer peripheral side of the mounting hole, and the signal output end 2212 of the pressure sensor 221 extends out of the protruding portion 232.
As shown in fig. 3 and 4, in the present embodiment, the pressure sensor 221 is communicatively connected to the data processing unit, and the signal output end 2212 of the pressure sensor 221 passes through the protrusion 232 for transmitting the thermal fluid pressure data in the sub-channel 22 to the data processing unit.
As shown in fig. 3 and 4, in this embodiment, a mounting hole is formed in the splitter plate body 21, a plug 23 is pressed into the mounting hole from the outer side of the splitter plate body 21, and the plug 23 and the splitter passage 22 are sealed by a first sealing ring 24; a hollow cylindrical pressure sensor support piece 222 is sleeved on the pressure sensor 221, the front end of the pressure sensor 221 and the plug 23 are sealed through a second sealing ring 25, and the space between the rear end of the pressure sensor 221 and the pressure sensor support piece 222 is sealed through a third sealing ring 26; the signal output end 2212 of the pressure sensor 221 passes through the pressure sensor support 222 and the inner hole of the internal thread plug 28 and is in communication connection with the data processing unit; the pressure sensor support 222 is pressed into the plug 23 and sealed with the plug 23 by the fourth sealing ring 27; the external thread plug 29 is screwed into the mounting hole of the flow distribution plate body 21, the plug 23 is pressed tightly, and the internal thread plug 28 is screwed into the threaded hole of the external thread plug 29 and presses the pressure sensor support 222; a drain pipe 4 is mounted on the outer side of the flow distribution plate body 21, and the drain pipe 4 is fitted around the outer peripheral side of the protruding portion 232 of the plug 23 through the outer gasket and fixed to the outer end surface of the flow distribution plate body 21 by screws.
As shown in fig. 1 and 2, in this embodiment, a first cushion block 5 is disposed between the fixed mold plate 1 and the splitter plate 2, and the fixed mold base plate, the splitter plate 2 and the first cushion plate are fixed together to form a fixed mold part, wherein a groove is formed on the outer side of the splitter plate body 21, and the first cushion block 5 is embedded in the groove, so that a sufficient gap is left between the splitter plate 2 and the fixed mold plate 1, thereby forming a heat insulation layer.
As shown in fig. 1 and 2, in this embodiment, a mold core 10 is disposed on one side of the splitter plate 2 away from the fixed mold plate 1, and a second cushion block 6 is disposed between the mold cores 10 of the splitter plate 2, wherein a groove is disposed on an outer side of the splitter plate body 21, and the second cushion block 6 is embedded in the groove, so that a sufficient gap is left between the splitter plate 2 and the mold core 10, thereby forming a thermal insulation layer.
As shown in fig. 3 and 4, in this embodiment, a main flow passage 72 is provided in the nozzle body 71, a sub flow passage 22 communicating with the main flow passage 72 is provided in the sub flow plate body 21, one end of the sub flow passage 22 is connected with the hot nozzle 8, the nozzle 7 is communicated with the hot nozzle 8 through the sub flow plate 2, and plastic heat flows through the main flow passage 72 in the nozzle body 71 to flow into the sub flow passage 22 in the sub flow plate body 21, then flows into the hot nozzle 8 through the sub flow passage 22, and further enters the cavity of the mold insert 10; preferably, a plurality of branch channels 22 of the main channel 72 are arranged in the flow distribution plate body 21, and one end of each branch channel 22 is connected with a hot nozzle 8.
Through above-mentioned hot runner unit, detect the hot-fluid pressure data in the subchannel 22 through pressure sensor 221, and then compare the hot-fluid pressure data in the subchannel 22 with injection moulding equipment's injection pressure data, the injection pressure of supplementary regulation injection moulding equipment, simultaneously, the wearing and tearing ageing degree of monitoring injection moulding equipment relevant part realizes the early warning of trouble emergence initial stage.
Example two
The embodiment provides an injection molding system with the hot runner unit, and the injection molding system further comprises an injection unit and a data processing unit, wherein the injection unit comprises a material cylinder, a screw and a screw control device, one end of the material cylinder is connected with a nozzle 7, and the screw control device is connected with the screw; the data processing unit is respectively connected with the pressure sensor 221 and the screw control device in a communication way.
In this embodiment, the data processing unit receives the hot fluid pressure data in the sub-channel 22 transmitted by the pressure sensor 221, and sends a signal to the screw control device based on the obtained hot fluid pressure data in the sub-channel 22, so as to control the injection pressure applied to the screw or adjust the injection speed of the screw, so that the hot fluid pressure in the sub-channel 22 meets the requirements of injection molding process parameters, ensure the quality of plastic products and the stability of the production process, and prevent the defects of sink marks, deformation and dimensional deviation of the plastic products caused by the loss of the injection pressure.
The injection molding is a clearance type operation process, the injection pressure is the pressure applied by advancing the screw to a specified injection completion position, the injection speed is the shortest time required for injecting the maximum injection amount, and due to the problems of wear and aging of parts of the injection unit, uncertain faults, pressure loss of butt joint of a nozzle 7 of the injection unit and a mold and the like, the accurate output of the injection pressure is influenced, so that the displayed injection pressure is deviated from the injection pressure set by injection molding process parameters.
In this embodiment, under the conditions of set temperature and pressure, the screw control device controls the injection pressure applied to the screw and the screw opening time, and the screw pushes the hot fluid in the cylinder to move, so that the hot fluid in the cylinder is extruded out of the main flow channel 72 of the nozzle 7, and then flows into the sub flow channels 22 of the splitter plate 2 through the main flow channel 72, and further enters the cavity of the mold insert 10; meanwhile, the pressure sensor 221 arranged in the branch channel 22 detects the pressure of the hot fluid in the branch channel 22 and communicates with the data processing unit through the signal output end 2212 of the pressure sensor 221, the data processing unit judges whether the pressure data of the hot fluid in the branch channel 22 meets the parameter requirements of the injection molding process to send a signal to the screw control device, and the screw control device receives the signal and controls the injection pressure applied to the screw and the screw opening time to ensure that the pressure of the hot fluid flowing into the branch channel 22 through the main channel 72 meets the reasonable pressure required by the parameter requirements of the injection molding process.
Through the injection molding system, the pressure sensor 221 reports the hot fluid pressure data in the sub-runner 22 to the data processing unit, the data processing unit compares the hot fluid pressure data in the sub-runner 22 with the injection pressure data applied to the screw, and the data processing unit can not only send a signal to the screw control device to control the injection pressure and/or the injection speed so that the hot fluid pressure in the sub-runner 22 meets the required technological parameter requirements of mold injection molding, but also form empirical data to realize self-learning.
EXAMPLE III
The embodiment of the invention provides a control method applied to the injection molding system, which comprises the following steps:
step S1, melting plastic particles in the charging barrel to obtain hot fluid;
step S2, determining a target injection pressure P0, a target injection velocity V0, and a target thermal fluid pressure P0' within the sub-channel 22;
step S3, controlling the screw to push the hot fluid to flow into the sub-runner 22 through the main runner 72 based on the target injection pressure P0 and the target injection speed V0, and obtaining the actual hot fluid pressure P in the sub-runner 22;
step S4, judging the actual hot fluid pressure P and the target hot fluid pressure P0 ', if P is equal to P0', the runner 22 enters a pressure maintaining stage; if P is less than P0 ', adjusting the injection pressure P0 to P1 and/or the injection speed V0 to V1, and obtaining the hot fluid pressure P in the branch passage 22 again until P is equal to P0', and then the branch passage 22 enters the pressure maintaining stage.
In this embodiment, the data processor receives the thermal fluid pressure data in the sub-channel 22 transmitted by the pressure sensor 221, and stores a thermal fluid pressure curve and an injection pressure curve formed based on the thermal fluid pressure data in the sub-channel 22 in association with each other.
Preferably, the data processor receives the hot fluid pressure data in the sub-channel 22 transmitted by the pressure sensor 221, and reports the hot fluid pressure data and the injection pressure data to the cloud server, and the cloud server obtains the hot fluid pressure data and the injection pressure data to obtain a hot fluid pressure curve and an injection pressure curve formed based on the hot fluid pressure data, and finally forms the injection molding process parameter database.
In this embodiment, in step S2, the target injection pressure P0, the target injection velocity V0, and the target hot-fluid pressure P0' in the branch passage 22 are determined from the injection molding process parameters or the hot-fluid pressure curve and the injection pressure curve.
In this embodiment, in step S4, the determining the actual thermal fluid pressure P and the target thermal fluid pressure P0 ', if P is less than P0', further includes: increasing the injection speed V0 to V1, controlling the screw to push the hot fluid to flow into the sub-runners 22 through the main runner 72 based on the injection speed V1 and the target injection pressure P0, and acquiring the hot fluid pressure P in the sub-runners 22 again, wherein the data processor forms a hot fluid pressure curve based on the hot fluid pressure data in the sub-runners 22 and the injection speed.
In this embodiment, the method further includes: at the same injection pressure, the hot fluid pressure in the same feed manifold 22 remains constant as the rate of increase of the injection velocity.
In this embodiment, in step S4, after the diversion channel 22 enters the pressure maintaining stage, the method further includes:
step S5, after the pressure maintaining time T, judging the actual hot fluid pressure P and the target hot fluid pressure P0 ', and if P is more than or equal to P0', executing injection molding operation; if P is less than P0 ', the injection pressure is increased until P is greater than or equal to P0' after the dwell time T.
In this embodiment, if P is less than P0 ', the injection pressure is increased, and after the pressure holding time T, P is greater than or equal to P0', so as to ensure that the pressure of the hot fluid in the runner 22 meets the parameter requirements of the injection molding process, and the injection molding operation is performed by injecting the hot fluid in the runner 22 into the cavity of the mold insert 10, thereby forming the plastic product.
By the control method of the hot runner system, a pressure curve is formed by collecting hot fluid pressure data in the sub-runner 22, and the pressure curve is compared with an injection pressure curve of injection molding equipment to assist in debugging process pressure parameters of a mold, so that the hot fluid pressure in the sub-runner 22 meets the process parameters required by mold injection.
Claims (10)
1. The utility model provides a hot runner unit, includes fixed die plate and flow distribution plate, is equipped with the nozzle on the fixed die plate, and the nozzle includes the nozzle body, and this internal sprue that is equipped with of nozzle, its characterized in that, flow distribution plate include the flow distribution plate body, and this internal subchannel that is equipped with the intercommunication sprue of flow distribution plate installs pressure sensor in the subchannel.
2. The hot runner unit according to claim 1, wherein the runner has a port, a plug for closing the port of the runner is mounted on the runner body, a through hole is formed in the plug, the through hole is communicated with the runner, and the pressure sensor penetrates out of the through hole and is disposed in the runner.
3. The hot runner unit according to claim 2, wherein the manifold body has a mounting hole, the plug comprises an insertion portion inserted into the manifold from the mounting hole, the insertion portion is attached to the outer peripheral wall of the manifold, and the detection end of the pressure sensor extends out of the insertion portion and is disposed in the manifold.
4. The hot runner unit according to claim 3, wherein the plug further comprises a protrusion disposed outside the manifold body, the protrusion having a radial dimension larger than a diameter of the mounting hole, the protrusion being attached to the manifold body on an outer circumferential side of the mounting hole, and the signal output terminal of the pressure sensor protrudes from the protrusion.
5. An injection molding system having the hot runner unit of any of claims 1 to 4, further comprising an injection unit and a data processing unit, the injection unit comprising a barrel, a screw, and a screw control device, the barrel having one end connected to the nozzle, the screw control device connected to the screw; the data processing unit is respectively in communication connection with the pressure sensor and the screw control device.
6. A control method for use in an injection molding system of claim 5, comprising:
melting plastic particles in a charging barrel to obtain hot fluid;
determining a target injection pressure P0, a target injection velocity V0 and a target thermal fluid pressure P0' in the sub-channel;
controlling the screw to push the hot fluid to flow into the sub-runners through the main runner based on the target injection pressure P0 and the target injection speed V0, and obtaining the actual hot fluid pressure P in the sub-runners;
judging the actual hot fluid pressure P and the target hot fluid pressure P0 ', and if P is equal to P0', entering a pressure maintaining stage by the branch channel; if P is less than P0 ', adjusting the injection pressure P0 to be P1 and/or the injection speed V0 to be V1, and obtaining the hot fluid pressure P in the sub-channel again until P is equal to P0', and then the sub-channel enters the pressure maintaining stage.
7. The method for controlling the hot runner system according to claim 6, wherein the data processor receives the hot fluid pressure data in the sub-runner transmitted from the pressure sensor, and stores the hot fluid pressure curve and the injection pressure curve in association with each other, the hot fluid pressure curve being formed based on the hot fluid pressure data in the sub-runner.
8. The method as claimed in claim 7, wherein the determining the actual thermal fluid pressure P and the target thermal fluid pressure P0 'if P is less than P0' further comprises:
increasing the injection speed V0 to be V1, controlling the screw to push the hot fluid to flow into the sub-runners through the main runner based on the injection speed V1 and the target injection pressure P0, obtaining the hot fluid pressure P in the sub-runners again, and forming a hot fluid pressure curve by the data processor based on the hot fluid pressure data in the sub-runners and the injection speed.
9. The method of controlling a hot-runner system according to claim 8, further comprising: at the same injection pressure, the hot fluid pressure in the same feed sub-channels remains constant as the rate of increase of the injection velocity.
10. A control method for an injection molding system according to any one of claims 6 to 9, wherein after the runner enters the pressure holding stage, the method further comprises:
after the pressure maintaining time T, judging the actual hot fluid pressure P and the target hot fluid pressure P0 ', and if P is more than or equal to P0', executing injection molding operation; if P is less than P0 ', the injection pressure is increased until P is greater than or equal to P0' after the dwell time T.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114953361A (en) * | 2022-04-24 | 2022-08-30 | 浙江恒道科技有限公司 | Spiral type mixing and pouring mechanism of hot runner mold |
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| JP2004188825A (en) * | 2002-12-12 | 2004-07-08 | Toshimichi Nishizawa | Injection mold |
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| CN209812985U (en) * | 2019-03-14 | 2019-12-20 | 上海甬兴塑胶有限公司 | Hot runner system for injection molding |
| CN111605154A (en) * | 2020-04-26 | 2020-09-01 | 英格斯模具制造（中国）有限公司 | Control method for hot runner pressure maintaining in injection molding and injection molding system |
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