CN114750382B - Injection molding pressure control system and control method - Google Patents
Injection molding pressure control system and control method Download PDFInfo
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- CN114750382B CN114750382B CN202210342692.2A CN202210342692A CN114750382B CN 114750382 B CN114750382 B CN 114750382B CN 202210342692 A CN202210342692 A CN 202210342692A CN 114750382 B CN114750382 B CN 114750382B
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- module
- pressure
- control module
- injection
- pid control
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- 238000001746 injection moulding Methods 0.000 title claims abstract description 32
- 238000000034 method Methods 0.000 title claims abstract description 27
- 238000002347 injection Methods 0.000 claims abstract description 51
- 239000007924 injection Substances 0.000 claims abstract description 51
- 238000006243 chemical reaction Methods 0.000 claims description 10
- 239000000463 material Substances 0.000 claims description 10
- 238000005070 sampling Methods 0.000 claims description 9
- 230000009466 transformation Effects 0.000 claims description 9
- 239000012778 molding material Substances 0.000 claims description 4
- 230000008054 signal transmission Effects 0.000 claims 1
- 238000000465 moulding Methods 0.000 description 2
- 239000011347 resin Substances 0.000 description 2
- 229920005989 resin Polymers 0.000 description 2
- 238000007792 addition Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000007493 shaping process Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
- B29C45/17—Component parts, details or accessories; Auxiliary operations
- B29C45/76—Measuring, controlling or regulating
- B29C45/77—Measuring, controlling or regulating of velocity or pressure of moulding material
-
- 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
-
- 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
- B29C2945/76929—Controlling method
- B29C2945/76956—Proportional
- B29C2945/76966—Proportional and integral, i.e. Pl regulation
- B29C2945/76969—Proportional and integral, i.e. Pl regulation derivative and integral, i.e. PID regulation
Landscapes
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Mechanical Engineering (AREA)
- Injection Moulding Of Plastics Or The Like (AREA)
Abstract
The invention discloses an injection molding pressure control system and a control method, wherein the system comprises a mold pressure sensing module, a nozzle pressure sensing module, a comparison module, a driving control module, a speed measuring module, a PID control module and a main control module, wherein the mold pressure sensing module is connected with the main control module, the main control module is connected with the nozzle pressure sensing module, the nozzle pressure sensing module is connected with the PID control module, the driving control module is connected with the speed measuring module and the PID control module, the speed measuring module is connected with the comparison module, the comparison module is connected with the PID control module, and the main control module is connected with the PID control module. The invention also discloses a control method of the system. According to the invention, the PID control module is used for precisely controlling the pressure in the injection process and the pressure maintaining process, so that the quality of injection molded products is improved.
Description
Technical Field
The invention relates to the technical field of injection molding machine control, in particular to an injection molding pressure control system and an injection molding pressure control method.
Background
At present, plastic products are widely used in modern society, and from articles of daily use to industrial accessories and medical appliances, the quality requirements of people on the plastic products are gradually improved, but the plastic products prepared by the traditional injection molding method are deformed due to injection pressure in the injection molding process, or shrinkage or buckling deformation is generated due to insufficient pressure in the pressure maintaining process, so that the problem that how to effectively and accurately control the pressure in the injection molding process and the forming process becomes the necessary consideration in the injection molding production is solved.
The invention of CN 103481479B discloses a pressure control device for an injection molding machine, which is provided with a pressure maintaining unit for performing pressure control based on a force detected by a force detecting unit for detecting a force applied to a screw in an axial direction, a metering unit, and a preliminary injection unit for performing pressure control based on a resin pressure detected by the resin pressure detecting unit. The pressure in the injection molding machine can be detected more accurately to control the pressure. However, this patent cannot precisely control the pressure change speed and control the pressure control lag, and the control method has limitations.
Disclosure of Invention
Aiming at the problem that the injection pressure control is lagged and the pressure change rate cannot be accurately controlled, the invention provides an injection pressure control system and a control method, and the PID control module is used for controlling the pressure change rate and the injection pressure during injection, so that the purposes of timely and accurately controlling the injection pressure and the pressure change rate are achieved.
The technical problems of the invention are mainly solved by the following technical proposal: the injection molding pressure control system comprises a mold pressure sensing module, a nozzle pressure sensing module, a comparison module, a driving control module, a speed measuring module, a PID control module and a main control module, wherein the mold pressure sensing module is connected with the main control module, the main control module is connected with the nozzle pressure sensing module, the nozzle pressure sensing module is connected with the PID control module, the driving control module is connected with the speed measuring module and the PID control module, the speed measuring module is connected with the comparison module, the comparison module is connected with the PID control module, the mold pressure sensing module is connected with the PID control module, and the main control module is connected with the PID control module. The speed measuring module is used for acquiring the rotation speed of the screw rod, and the comparing module is used for inputting an ideal pressure transformation curve during injection of the material to be injected.
Preferably, the die pressure sensing module comprises a die cavity pressure sensor, and the die cavity pressure sensor is connected with the main control module. The die pressure sensing module further comprises a warning module, and an alarm is sent out when the pressure exceeds a pressure threshold required by material molding.
Preferably, the main control module comprises a sampling module, a processing module and a parameter configuration module, wherein the parameter configuration module is connected with the nozzle pressure sensing module, and the processing module is connected with the PID control module. The sampling module is used for acquiring pressure thresholds of all stages of injection molding of the material to be processed and time thresholds of all stages of injection molding, and the processing module is used for acquiring pressure signals and transmitting the pressure signals to the PID control module. The nozzle pressure sensing module comprises a high-temperature melt pressure sensor.
Preferably, the driving control module comprises a rotating speed signal shaping module, and the signal conversion module is connected with the PID control module. The signal conversion module converts the rotating speed signal into a control signal and simultaneously converts a feedback signal formed by the PID control module into a speed control signal.
An injection molding pressure control method comprising the steps of:
s1, setting a first pressure threshold value, a second pressure threshold value and a third pressure threshold value for a nozzle pressure sensing module through a parameter configuration module;
s2, inputting an ideal pressure transformation curve of the material to be injected during injection into a comparison module;
s3, measuring the rotating speed of the screw rod through a speed measuring module, and transmitting the rotating speed into a driving control module;
s4, the driving control module converts the rotating speed signal into a control signal and transmits the control signal to the PID control module;
s5, measuring pressure by using a die pressure sensing module and a nozzle pressure sensing module, and transmitting a pressure signal into a PID control module;
and S6, the PID control module performs pressure control according to the ideal pressure transformation curve input by the comparison module.
The ideal pressure transformation curve during injection molding comprises a pressure curve during injection molding, a pressure curve during pressure maintaining and a total curve during molding, and the parameter configuration module can also configure time thresholds of various stages during injection molding.
Preferably, the step S1 specifically includes:
s11, staff inputs the maximum injection pressure and the pressure maintaining pressure of the injection molding materials into the sampling module;
s12 sets 50% of the maximum injection pressure as the first pressure threshold, 90% as the second pressure threshold, and the holding pressure as the third pressure threshold.
According to the requirement, if the pressure maintaining process is divided into more stages, more pressure thresholds can be set according to each stage.
Preferably, the step S6 specifically includes:
s61, the PID control module generates a lower limit threshold K1 and an upper limit threshold K2 of the injection growth rate change rate according to an ideal pressure change curve;
s62, when the injection growth rate is out of the [ K1, K2] interval, the PID control module generates a feedback signal to the drive control module, and controls the increase/decrease of the rotating speed of the screw until the injection growth rate change rate is in the [ K1, K2] interval;
s63, when the pressure at the nozzle reaches a first pressure threshold, the processing module transmits a conversion reminding signal to the PID control module, the PID control module generates an injection rate change rate threshold K3, and the injection rate change rate is controlled to be [ K2, K3];
and S64, when the injection pressure reaches the second pressure threshold, the processing module judges whether to enter a pressure maintaining process, if so, the PID control module generates an injection descending rate change rate threshold K4 by the block, and controls the rotation speed of the screw to control the injection descending rate to be [0.9K4,1.1K4] until the pressure at the nozzle is a third pressure threshold.
If the pressure maintaining process is divided into a plurality of stages, the PID control module can also generate more injection descending rate change rates in the subsequent pressure maintaining stage.
The invention has the beneficial effects that:
1. the parameter setting of the equipment can be carried out according to the material to be injection-molded, so that the injection molding efficiency is improved;
2. the control precision and the control speed of the injection molding pressure are improved;
3. the injection pressure increasing speed during injection molding and the pressure converting speed during converting into pressure maintaining process can be precisely controlled, so that the quality of produced products is higher.
Drawings
Fig. 1 is a schematic view of a structure of the present invention.
Fig. 2 is a flow chart of a method of the present invention.
In the figure, a mold type cavity pressure sensor, a high-temperature melt pressure sensor, a mold, a nozzle and a driving motor are shown in the figure, wherein the mold type cavity pressure sensor, the high-temperature melt pressure sensor, the mold and the nozzle are shown in the figure, and the driving motor is shown in the figure.
Detailed Description
The specific embodiments described herein are offered by way of example only to illustrate the spirit of the invention.
Examples: the injection molding pressure control system of the embodiment, as shown in fig. 1, comprises a mold pressure sensing module, wherein the mold pressure sensing module comprises a mold cavity pressure sensor 1, the mold cavity pressure sensor 1 is arranged in a mold 3, the mold pressure sensing module is connected with a main control module, the main control module comprises a sampling module, a processing module and a parameter configuration module, the sampling module is used for acquiring pressure thresholds of all stages of injection molding of a material to be processed and time thresholds of all stages of injection molding, the processing module is used for acquiring pressure signals, the processing module is connected with a PID control module, the processing module transmits the acquired pressure signals to the PID control module, the parameter configuration module is used for setting the pressure threshold of the nozzle pressure sensing module, the nozzle pressure sensing module comprises a high-temperature melt pressure sensor 2, and the high-temperature melt pressure sensor 2 is arranged on a nozzle 4.
The control system further comprises a speed measuring module, the speed measuring module is connected with the driving motor 5 and used for acquiring the rotating speed of the screw, the speed measuring module transmits rotating speed signals to the driving control module, the driving control module comprises a signal conversion module, and the signal conversion module is used for converting the rotating speed signals into control signals and converting feedback signals formed by the PID control module into speed control signals. The drive motor 5 is also connected to a comparison module for inputting an ideal pressure change curve for the injection of the material to be injected. The PID control module is also connected with the drive control module and is used for controlling the pressure according to the ideal pressure transformation curve input by the comparison module.
The injection pressure control method of the present embodiment, as shown in fig. 2, includes the steps of:
s1, setting a first pressure threshold value, a second pressure threshold value and a third pressure threshold value for a nozzle pressure sensing module through a parameter configuration module;
the method specifically comprises the following steps:
s11, staff inputs the maximum injection pressure and the pressure maintaining pressure of the injection molding materials into the sampling module;
s12 sets 50% of the maximum injection pressure as the first pressure threshold, 90% as the second pressure threshold, and the holding pressure as the third pressure threshold.
According to the requirement, if the pressure maintaining process is divided into more stages, more pressure thresholds can be set according to each stage, and the 50% and 90% can be adjusted according to the change of the mold of the equipment and the change of the injection molding material.
S2, inputting an ideal pressure transformation curve of the material to be injected during injection into a comparison module;
s3, measuring the rotating speed of the screw rod through a speed measuring module, and transmitting the rotating speed into a driving control module;
s4, the driving control module converts the rotating speed signal into a control signal and transmits the control signal to the PID control module;
s5, measuring pressure by using a die pressure sensing module and a nozzle pressure sensing module, and transmitting a pressure signal into a PID control module;
and S6, the PID control module performs pressure control according to the ideal pressure transformation curve input by the comparison module.
The method specifically comprises the following steps:
s61, the PID control module generates a lower limit threshold K1 and an upper limit threshold K2 of the injection growth rate change rate according to an ideal pressure change curve;
s62, when the injection growth rate is out of the [ K1, K2] interval, the PID control module generates a feedback signal to the drive control module, and controls the increase/decrease of the rotating speed of the screw until the injection growth rate change rate is in the [ K1, K2] interval;
s63, when the pressure at the nozzle reaches a first pressure threshold, the processing module transmits a conversion reminding signal to the PID control module, the PID control module generates an injection rate change rate threshold K3, and the injection rate change rate is controlled to be [ K2, K3];
and S64, when the injection pressure reaches the second pressure threshold, the processing module judges whether to enter a pressure maintaining process, if so, the PID control module generates an injection descending rate change rate threshold K4 by the block, and controls the rotation speed of the screw to control the injection descending rate to be [0.9K4,1.1K4] until the pressure at the nozzle is a third pressure threshold. Wherein 0.9 and 1.1 can be adaptively adjusted according to different pressure maintaining requirements.
If the pressure maintaining process is divided into a plurality of stages, the PID control module can also generate more injection descending rate change rates in the subsequent pressure maintaining stage.
Those skilled in the art may make various modifications or additions to the described embodiments or substitutions thereof without departing from the spirit of the invention or exceeding the scope of the invention as defined in the accompanying claims.
Although the terms master control module, processing module, mold pressure sensing module, PID control module, etc. are used more herein, the possibility of using other terms is not precluded. These terms are used merely for convenience in describing and explaining the nature of the invention; they are to be interpreted as any additional limitation that is not inconsistent with the spirit of the present invention.
Claims (7)
1. The utility model provides an injection molding pressure control system, its characterized in that includes mould pressure sensing module, nozzle pressure sensing module, comparison module, drive control module, speed measuring module, PID control module and main control module, mould pressure sensing module and main control module are connected, main control module and nozzle pressure sensing module are connected, nozzle pressure sensing module and PID control module are connected, drive control module and speed measuring module and PID control module are connected, speed measuring module and comparison module are connected, comparison module and PID control module are connected, main control module includes sampling module, processing module and parameter configuration module, comparison module is used for the input ideal pressure conversion curve when waiting to inject the injection of material, speed measuring module is used for acquireing the rotational speed of screw rod and with rotational speed signal transmission to drive control module.
2. An injection molding pressure control system as claimed in claim 1, wherein said mold pressure sensing module comprises a mold cavity pressure sensor, said mold cavity pressure sensor being coupled to a master control module.
3. An injection pressure control system according to claim 1 or 2, wherein the main control module comprises a sampling module, a processing module and a parameter configuration module, the parameter configuration module is connected with the nozzle pressure sensing module, and the processing module is connected with the PID control module.
4. The injection molding pressure control system of claim 1, wherein the drive control module comprises a signal conversion module, the signal conversion module being coupled to the PID control module.
5. A control method based on the injection pressure control system according to any one of claims 1 to 4, characterized by comprising the steps of:
s1, setting a first pressure threshold value, a second pressure threshold value and a third pressure threshold value for a nozzle pressure sensing module through a parameter configuration module;
s2, inputting an ideal pressure transformation curve of the material to be injected during injection into a comparison module;
s3, measuring the rotating speed of the screw rod through a speed measuring module, and transmitting the rotating speed into a driving control module;
s4, the driving control module converts the rotating speed signal into a control signal and transmits the control signal to the PID control module;
s5, measuring pressure by using a die pressure sensing module and a nozzle pressure sensing module, and transmitting a pressure signal into a PID control module; and S6, the PID control module performs pressure control according to the ideal pressure transformation curve input by the comparison module.
6. The control method according to claim 5, wherein the step S1 specifically includes:
s11, staff inputs the maximum injection pressure and the pressure maintaining pressure of the injection molding materials into the sampling module;
s12 sets 50% of the maximum injection pressure as the first pressure threshold, 90% as the second pressure threshold, and the holding pressure as the third pressure threshold.
7. The control method according to claim 5, wherein the step S6 specifically includes:
s61, the PID control module generates a lower limit threshold K1 and an upper limit threshold K2 of the injection growth rate change rate according to an ideal pressure change curve;
s62, when the injection growth rate is out of the [ K1, K2] interval, the PID control module generates a feedback signal to the drive control module, and controls the increase/decrease of the rotating speed of the screw until the injection growth rate change rate is in the [ K1, K2] interval;
s63, when the pressure at the nozzle reaches a first pressure threshold, the processing module transmits a conversion reminding signal to the PID control module, the PID control module generates an injection rate change rate threshold K3, and the injection rate change rate is controlled to be [ K2, K3];
and S64, when the injection pressure reaches the second pressure threshold, the processing module judges whether to enter a pressure maintaining process, if so, the PID control module generates an injection descending rate change rate threshold K4, and controls the rotation speed of the screw to control the injection descending rate change rate to be [0.9K4,1.1K4] until the pressure at the nozzle is a third pressure threshold.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202210342692.2A CN114750382B (en) | 2022-03-31 | 2022-03-31 | Injection molding pressure control system and control method |
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| CN202210342692.2A CN114750382B (en) | 2022-03-31 | 2022-03-31 | Injection molding pressure control system and control method |
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| CN114750382A CN114750382A (en) | 2022-07-15 |
| CN114750382B true CN114750382B (en) | 2024-03-19 |
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| Publication number | Publication date |
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| CN114750382A (en) | 2022-07-15 |
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