CN112571745B - Pressure control method and injection molding equipment - Google Patents
Pressure control method and injection molding equipment Download PDFInfo
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- CN112571745B CN112571745B CN202011308341.7A CN202011308341A CN112571745B CN 112571745 B CN112571745 B CN 112571745B CN 202011308341 A CN202011308341 A CN 202011308341A CN 112571745 B CN112571745 B CN 112571745B
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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
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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
- B29C2945/76494—Controlled parameter
- B29C2945/76498—Pressure
Abstract
The invention discloses a pressure control method and injection molding equipment, wherein the method is applied to the injection molding equipment, the injection molding equipment comprises a pressure controller, and the method comprises the following steps: after die assembly, starting a pressure controller to control the pressure in the die cavity to be a preset initial pressure; in the process of injecting the glue by the injection rod, controlling the pressure in the cavity of the mold to be a preset pressure corresponding to the real-time position of the injection rod; and in the pressure maintaining cooling process, the pressure in the mold cavity is controlled to be the pressure maintaining pressure for maintaining pressure and filling, and the pressure is released until the injection molding is finished. Therefore, the pressure in the mold cavity is controlled by the pressure controller in the injection molding process, so that the accurate control of the pressure is realized, and the injection molding effect is improved.
Description
Technical Field
The invention relates to the technical field of plastic packaging machines, in particular to a pressure control method and injection molding equipment.
Background
In the injection molding process of the plastic packaging machine, the pressure in the cavity of the mold needs to be controlled within a certain range. The required mold cavity pressure is currently achieved by controlling the overall pressure of the components comprising the upper mold, mold cavity, lower mold, etc. However, the upper die, the die cavity and the lower die are large in size, so that a long time is required for the overall pressure to reach the required pressure. And each process of pressure control requires a certain response time, and the pressure drop or rise also requires a certain time-length transition process.
Disclosure of Invention
The invention provides a pressure control method and injection molding equipment, aiming at realizing the accurate control of injection molding pressure and improving the injection molding effect.
To achieve the above object, the present invention provides a pressure control method applied to an injection molding apparatus including a pressure controller, the method including:
after die assembly, starting a pressure controller to control the pressure in the die cavity to be a preset initial pressure;
in the process of injecting the glue by the injection rod, controlling the pressure in the cavity of the mold to be a preset pressure corresponding to the real-time position of the injection rod;
and in the pressure maintaining and cooling process, the pressure in the mold cavity is controlled to be the pressure maintaining pressure for pressure maintaining and filling, and the pressure is released until the injection molding is finished.
Optionally, after the die assembly, starting the pressure controller to control the pressure in the die cavity to be a preset initial pressure, and before the die assembly, the method further includes:
and replacing a vacuum control valve and a vacuum pressure gauge of the injection molding equipment with the pressure controller.
Optionally, after the mold closing, starting a pressure controller to control the pressure in the mold cavity to be a preset initial pressure, and before the mold closing, further comprising
And replacing an original vacuum pump of the injection molding equipment with a standby vacuum pump, wherein the power of the standby vacuum pump is smaller than that of the original vacuum pump.
Optionally, the controlling the pressure in the mold cavity to a preset pressure corresponding to the real-time position of the injection rod includes:
when the injection rod reaches a preset first position interval, controlling the pressure in the mold cavity to be a first preset pressure through the pressure controller;
when the injection rod reaches a preset second position interval, controlling the pressure in the mold cavity to be a second preset pressure through the pressure controller;
and when the injection rod reaches a preset third position interval, controlling the pressure in the mold cavity to be a third preset pressure through the pressure controller.
Optionally, the controlling the pressure in the mold cavity to a preset pressure corresponding to the real-time position of the injection rod further comprises:
and setting preset position intervals of each section and corresponding preset pressure according to pressure influence factors, wherein the pressure influence factors comprise melting raw materials, product shapes and glue injection speeds.
Optionally, a first adjusting stroke is provided between the first preset pressure and the second preset pressure, and a transition time length of the pressure in the mold cavity from the first preset pressure to the second preset pressure is a first time length;
a second adjusting stroke is formed between the second preset pressure and the third preset pressure, and the transition time of the pressure in the die cavity from the second preset pressure to the third preset pressure is a second time;
the slopes of the first adjusting stroke and the second adjusting stroke are both larger than a preset slope, and the first duration and the second duration are both smaller than a preset duration.
Optionally, the controlling, by the pressure controller, the pressure in the mold cavity to be a second preset pressure further includes:
acquiring the time consumed by the cavity pressure from the first preset pressure to the second preset pressure;
and comparing the consumed time with the first time length, and if the consumed time is greater than the first time length, sending an abnormal warning.
Optionally, in the process of injecting the glue by the injection rod, the pressure in the mold cavity is controlled to be a preset pressure corresponding to the real-time position of the injection rod, and the method further includes:
and (3) filling plastics into a hopper of the injection molding equipment, and heating to obtain a molten material for injection molding, so that the molten material is injected into the mold cavity through a nozzle of the injection molding equipment.
Optionally, the controlling the pressure in the mold cavity to a holding pressure includes:
when the real-time pressure in the die cavity is detected to be lower than or higher than the pressure maintaining pressure, the real-time pressure in the die cavity is controlled to be increased or decreased through the pressure controller until the real-time pressure reaches the pressure maintaining pressure.
In addition, in order to achieve the above object, the present invention also provides an injection molding apparatus including a pressure controller that controls an operation of the injection molding apparatus by the pressure control method as described above.
Compared with the prior art, the invention provides a pressure control method and injection molding equipment, and the method comprises the following steps: after die assembly, starting a pressure controller to control the pressure in the die cavity to be a preset initial pressure; in the process of injecting the glue by the injection rod, controlling the pressure in the cavity of the mold to be a preset pressure corresponding to the real-time position of the injection rod; and in the pressure maintaining cooling process, the pressure in the mold cavity is controlled to be the pressure maintaining pressure for maintaining pressure and filling, and the pressure is released until the injection molding is finished. Therefore, the pressure in the mold cavity is controlled by the pressure controller in the injection molding process, so that the accurate control of the pressure is realized, and the injection molding effect is improved.
Drawings
FIG. 1 is a schematic flow chart of a first embodiment of the pressure control method of the present invention;
FIG. 2 is a schematic view of a pressure control system in an injection molding apparatus according to a first embodiment of the pressure control method of the present invention;
fig. 3 is a schematic view of pressure control involved in the first embodiment of the pressure control method of the present invention.
The implementation, functional features and advantages of the objects of the present invention will be further explained with reference to the accompanying drawings.
Detailed Description
It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
The injection molding apparatus according to the present embodiment is a molding apparatus for molding a thermoplastic plastic or a thermosetting plastic into plastic products having various shapes by using a plastic molding die. In general, injection molding apparatuses can be classified into horizontal, vertical, and angled types by their shapes.
The injection molding equipment comprises a machine body, a mold closing system and an injection system, wherein the machine body is used for fixing the mold closing system and the injection system, and the mold closing system and the injection system can be subjected to injection molding after being in butt joint. The die assembly system comprises an upper die, a lower die and a die groove in an accommodating cavity of the upper die and the lower die, wherein the die groove is used for accommodating a die. The mold closing system further comprises a mold ejector pin and a sprue, wherein the mold ejector pin is used for ejecting the mold out of the mold groove after injection molding and solidification. The sprue is arranged on the upper die and is used for being in butt joint with a nozzle of the injection molding system so as to inject molten materials into the die. The injection system comprises a nozzle, an injection rod, a non-return ring, a charging barrel, a screw, a heating ring, a hopper, a glue injection oil cylinder, a sol motor and the like.
The temperature and pressure are generally controlled during the injection molding process to ensure that the product is free of bubbles and has a desired profile. Generally, injection molding equipment is pressure controlled by a vacuum control valve, a vacuum gauge, and a vacuum breaker valve. Specifically, before injection molding starts, the vacuum control valve is started to vacuumize a mold cavity of a mold in the mold closing system, generally, the initial pressure in the mold cavity is atmospheric pressure 760Torr, when the vacuum control valve is turned on, the vacuum pressure in the mold cavity is reduced, when the pressure is reduced to a certain degree, air in a mold chase meets a vacuum pipeline with a small area, the vacuum pressure in the mold chase rises reversely, the vacuum control valve can control the pressure in the mold chase to the pressure (about 1 Torr) only when continuing to work, and the pressure in the mold chase can be displayed through the vacuum pressure gauge. This process is slow in response and may have some impact on the gold lines of the product.
In this embodiment, the relevant components for controlling the pressure in the injection molding apparatus are labeled as a pressure control system, and refer to fig. 2 specifically. FIG. 2 is a schematic view of a pressure control system in an injection molding apparatus according to a first embodiment of the pressure control method of the present invention. As shown in fig. 2, the mold cavity is connected to a pressure controller through a pipeline, so that the pressure controller can control the pressure in the mold cavity; the pressure controller is further connected with a vacuum pump, so that the vacuum pump can be used for vacuumizing to reduce the pressure of the mold cavity. In addition, a branch pipe connected with a vacuum breaking valve is further arranged on the pipeline between the mold and the pressure controller, so that pressure is relieved through the vacuum breaking valve. Therefore, accurate control of the pressure of the mold cavity in the mold cavity can be realized.
Further, continuing with fig. 2. The dashed line in fig. 2 is a pressure control means common to current injection molding equipment. That is, the vacuum control valve for controlling pressure is connected to the whole assembly including the upper mold, the mold cavity, the lower mold and other parts to control pressure, so that the range of pressure control is large, and more time and energy are consumed.
Based on the injection molding equipment, the embodiment provides a pressure control method, which comprises the following steps:
step S101: after die assembly, starting a pressure controller to control the pressure in the die cavity to be a preset initial pressure;
in this embodiment, the vacuum control valve and the vacuum pressure gauge of the injection molding apparatus are replaced with the pressure controller in advance. The pressure controller may be a programmable pressure controller whereby the required pressures at various stages of the injection molding process may be preset and precise control of the pressures achieved during the injection molding process. The pressure controller can display and precisely control the pressure.
It is noted that the present embodiment controls the pressure within the mold cavity by means of the pressure controller. Because the mould cavity volume is small, the vacuum control precision is high, and the response time is short, the required pressure can be reached in a short time. And because the mould cavity is small, the vacuum pump for vacuumizing only needs a standby vacuum pump with small power, so that the power consumption can be greatly saved. In this embodiment, an original vacuum pump of the injection molding equipment is replaced by a standby vacuum pump, wherein the power of the standby vacuum pump is smaller than that of the original vacuum pump.
After the pressure controller and the standby vacuum pump are installed, the injection molding equipment can be put into use.
When injection molding is needed, a mold is placed into the mold groove, external force is applied, so that the upper mold and the lower mold of the mold closing system run relatively, locking of the upper mold and the lower mold is realized, and the mold in the upper mold cavity and the lower mold cavity forms a complete mold cavity for injection molding.
And after die assembly, starting a pressure controller to control the pressure in the die cavity to be a preset initial pressure. The preset initial pressure may be generally equal to a standard atmospheric pressure, or a specific preset initial pressure may be set empirically.
Step S102: in the process of injecting glue by an injection rod, controlling the pressure in the cavity of the mold to be a preset pressure corresponding to the real-time position of the injection rod;
in this embodiment, a certain amount of plastic is loaded into a hopper of the injection molding device, and is heated to obtain a melt for injection molding, so that the melt is injected into the mold cavity through a nozzle of the injection molding device. The plastic is solid and has a certain melting point, and can be in a molten state after being heated, so that the plastic can be used for injection molding.
In this example, according to the actual requirement of injection molding, the various pressures in the injection molding process are set in the pressure controller in advance, so as to realize accurate pressure control in the process of injecting the glue by the injection rod.
Specifically, when the injection rod reaches a preset first position interval, the pressure in the mold cavity is controlled to be a first preset pressure through the pressure controller; for example, the first preset pressure is set to 600torr.
When the injection rod reaches a preset second position interval, controlling the pressure in the mold cavity to be a second preset pressure through the pressure controller; for example, the second preset pressure is set to 200torr.
And when the injection rod reaches a preset third position interval, controlling the pressure in the mold cavity to be a third preset pressure through the pressure controller. For example, the first preset pressure is set to 0torr.
The first position interval, the second position interval and the third position interval can be set as required. And more or fewer position intervals can be arranged according to the injection molding requirement.
Furthermore, preset position intervals of each section and corresponding preset pressure are set according to pressure influence factors, wherein the pressure influence factors comprise melting raw materials and product shapes. The injection pressure affects the injection speed and further affects the shape of the product. The product shapes comprise air lines, embossing, wave lines and the like, and different injection molding pressures correspond to different product shapes. And because different melts have different viscosities, fluidity and polymerization degrees, the different melts also have corresponding optimal injection molding pressures. Based on the embodiment, the position and pressure of the injection molding rod in the injection molding process are set at least based on the factors of melting raw materials, product shape, injection speed and the like. In this way, it is ensured that injection-molded products are obtained which have a good appearance and are free from bubbles.
Furthermore, a first adjusting stroke is formed between the first preset pressure and the second preset pressure, and the transition time of the pressure in the die cavity from the first preset pressure to the second preset pressure is a first time; a second adjusting stroke is formed between the second preset pressure and the third preset pressure, and the transition time of the pressure in the die cavity from the second preset pressure to the third preset pressure is a second time; the slopes of the first adjusting stroke and the second adjusting stroke are both larger than a preset slope, and the first duration and the second duration are both smaller than a preset duration. The preset first time length, the preset second time length and the preset slope can be set as required, for example, the preset time length is set to 30ms, 60ms and the like, and the preset slope is set to 1, 2, 3 and the like. It will be appreciated that in practice, more or fewer location intervals and/or pressure intervals may be provided, depending on the injection requirements. In this embodiment, the adjusting stroke refers to a stroke for adjusting the pressure in the mold cavity to a specified pressure by the pressure controller.
Specifically, referring to fig. 3, fig. 3 is a schematic view of a first embodiment of the pressure control method according to the present invention. As shown in fig. 3, the first predetermined pressure is 760torr, the second predetermined pressure is 300torr, and the third predetermined pressure is 0torr. The first adjusting stroke and the second adjusting stroke only occupy short distances, and the relative first duration and the second duration are also extremely short.
Further, the controlling the pressure in the mold cavity to a second preset pressure by the pressure controller further includes:
acquiring the time consumed by the cavity pressure from the first preset pressure to the second preset pressure;
and comparing the consumed time with the first time length, and if the consumed time is greater than the first time length, sending an abnormal warning.
That is, if the time is too long, this may indicate that the mold, injection rod, or pressure controller may be malfunctioning, thus requiring a warning to be issued for maintenance by a technician. Similarly, an abnormal warning may also be issued when the time taken for the chamber pressure to reach the third preset pressure from the second preset pressure is longer than a preset time.
Step S103: and in the pressure maintaining and cooling process, the pressure in the mold cavity is controlled to be the pressure maintaining pressure for pressure maintaining and filling, and the pressure is released until the injection molding is finished.
Specifically, when the real-time pressure in the mold cavity is detected to be lower than or higher than the holding pressure, the real-time pressure in the mold cavity is controlled to be increased or decreased by the pressure controller until the real-time pressure reaches the holding pressure. Because polymerization reaction can take place in melting material cooling or heating process, corresponding volume can change, if the volume inflation then will melt the material and spill over, if the volume reduces, then need continue to inject into and melt the material, consequently need continue to monitor pressure in the cooling process of keeping pressure, guaranteed the stability of moulding plastics in the filling process of keeping pressure. And closing the pressure controller until the injection molding is finished, and opening the vacuum breaking valve to release the pressure. And ejecting the die after pressure relief, and obtaining a high-quality product after demolding.
According to the scheme, after die assembly, the pressure controller is started, and the pressure in the die cavity is controlled to be the preset initial pressure; in the process of injecting the glue by the injection rod, controlling the pressure in the cavity of the mold to be a preset pressure corresponding to the real-time position of the injection rod; and in the pressure maintaining cooling process, the pressure in the mold cavity is controlled to be the pressure maintaining pressure for maintaining pressure and filling, and the pressure is released until the injection molding is finished. Therefore, the pressure in the mold cavity is controlled by the pressure controller in the injection molding process, so that the accurate control of the pressure is realized, and the injection molding effect is improved.
In addition, the invention also provides an injection molding device, which comprises a pressure controller, wherein the operation of the injection molding device is controlled by the pressure control method, and the details are not repeated herein.
It should be noted that, in this document, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or system that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or system. Without further limitation, an element defined by the phrase "comprising a … …" does not exclude the presence of another identical element in a process, method, article, or system that comprises the element.
The above-mentioned serial numbers of the embodiments of the present invention are merely for description and do not represent the merits of the embodiments.
Through the above description of the embodiments, those skilled in the art will clearly understand that the method of the above embodiments can be implemented by software plus a necessary general hardware platform, and certainly can also be implemented by hardware, but in many cases, the former is a better implementation manner. Based on such understanding, the technical solution of the present invention may be embodied in the form of a software product, which is stored in a computer-readable storage medium (such as ROM/RAM, magnetic disk, and optical disk) as described above, and includes several instructions for enabling a terminal device to execute the method according to the embodiments of the present invention.
The above description is only for the preferred embodiment of the present invention and is not intended to limit the scope of the present invention, and all equivalent structures or flow transformations made by the present specification and drawings, or applied directly or indirectly to other related arts, are included in the scope of the present invention.
Claims (8)
1. A pressure control method applied to an injection molding apparatus including a pressure controller, the method comprising:
after die assembly, starting a pressure controller to control the pressure in the die cavity to be a preset initial pressure;
in the process of injecting the glue by the injection rod, controlling the pressure in the cavity of the mold to be a preset pressure corresponding to the real-time position of the injection rod;
in the pressure maintaining and cooling process, the pressure in the mold cavity is controlled to be pressure maintaining pressure for pressure maintaining and filling, and the pressure is released until the injection molding is finished;
wherein, the pressure in the mould cavity is controlled at a preset pressure corresponding to the real-time position of the injection rod, and the method comprises the following steps:
when the injection rod reaches a preset first position interval, controlling the pressure in the mold cavity to be a first preset pressure through the pressure controller;
when the injection rod reaches a preset second position interval, controlling the pressure in the mold cavity to be a second preset pressure through the pressure controller;
when the injection rod reaches a preset third position interval, controlling the pressure in the mold cavity to be a third preset pressure through the pressure controller;
a first adjusting stroke is formed between the first preset pressure and the second preset pressure, and the transition time of the pressure in the die cavity from the first preset pressure to the second preset pressure is a first time;
a second adjusting stroke is formed between the second preset pressure and the third preset pressure, and the transition time of the pressure in the die cavity from the second preset pressure to the third preset pressure is a second time;
the slopes of the first adjusting stroke and the second adjusting stroke are both larger than a preset slope, and the first duration and the second duration are both smaller than a preset duration.
2. The method of claim 1, wherein after closing the mold, activating a pressure controller to control the pressure in the mold cavity to a predetermined initial pressure, and further comprising:
and replacing a vacuum control valve and a vacuum pressure gauge of the injection molding equipment with the pressure controller.
3. The method of claim 1, wherein after closing the mold, activating a pressure controller to control the pressure in the mold cavity to a predetermined initial pressure, and further comprising
And replacing an original vacuum pump of the injection molding equipment with a standby vacuum pump, wherein the power of the standby vacuum pump is less than that of the original vacuum pump.
4. The method of claim 1, wherein said controlling the pressure within the mold cavity at a preset pressure corresponding to the real-time position of the injection rod further comprises:
and setting preset position intervals of each section and corresponding preset pressure according to pressure influence factors, wherein the pressure influence factors comprise melting raw materials, product shapes and glue injection speeds.
5. The method of claim 1, wherein the controlling the pressure within the mold cavity to a second preset pressure by the pressure controller further comprises:
acquiring the time consumed by the cavity pressure from the first preset pressure to the second preset pressure;
and comparing the consumed time with the first time length, and if the consumed time is greater than the first time length, sending an abnormal warning.
6. The method of claim 1, wherein the controlling the pressure in the mold cavity to a preset pressure corresponding to the real-time position of the injection rod during the injection of the injection rod further comprises:
and (3) filling plastics into a hopper of the injection molding equipment, and heating to obtain a molten material for injection molding, so that the molten material is injected into the mold cavity through a nozzle of the injection molding equipment.
7. The method according to any one of claims 1-6, wherein the controlling the pressure within the mold cavity to a dwell pressure comprises:
when the real-time pressure in the die cavity is detected to be lower than or higher than the pressure maintaining pressure, the real-time pressure in the die cavity is controlled to be increased or decreased through the pressure controller until the real-time pressure reaches the pressure maintaining pressure.
8. An injection molding apparatus comprising a pressure controller, wherein the injection molding apparatus is controlled to operate by the pressure control method of any one of claims 1-7.
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| CN202011308341.7A CN112571745B (en) | 2020-11-19 | 2020-11-19 | Pressure control method and injection molding equipment |
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| CN202011308341.7A CN112571745B (en) | 2020-11-19 | 2020-11-19 | Pressure control method and injection molding equipment |
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Family Cites Families (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1110534A (en) * | 1965-11-22 | 1968-04-18 | Peco Machinery Ltd | Improvements in or relating to injection moulding machines and processes |
| JPS53140361A (en) * | 1977-05-13 | 1978-12-07 | Hitachi Zosen Corp | Injection molding machine |
| JP4136303B2 (en) * | 2000-11-24 | 2008-08-20 | 三菱重工プラスチックテクノロジー株式会社 | Injection molding method and injection molding apparatus |
| CN2649314Y (en) * | 2003-04-24 | 2004-10-20 | 香港生产力促进局 | Injection device of miniature plastic part with superhigh speed precision pressure control |
| JP5092927B2 (en) * | 2008-06-20 | 2012-12-05 | ソニー株式会社 | INJECTION MOLDING CONTROL METHOD AND INJECTION MOLDING CONTROL DEVICE |
| CN102069577B (en) * | 2010-11-25 | 2014-04-09 | 宁波弘讯科技股份有限公司 | Precision plastic injection system and control method thereof |
| CN102555180B (en) * | 2012-02-10 | 2014-01-22 | 浙江大学 | Injection and pressure maintaining switching control system and method for injection molding machine based on nozzle pressure |
| CN111016102B (en) * | 2019-12-17 | 2022-07-01 | 广东伊之密精密注压科技有限公司 | Control method and control device for pressure relief of injection molding machine and injection molding machine |
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