CN201538022U - Device for module chamber temperature controlling and pressure maintaining process - Google Patents
Device for module chamber temperature controlling and pressure maintaining process Download PDFInfo
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- CN201538022U CN201538022U CN2009202230623U CN200920223062U CN201538022U CN 201538022 U CN201538022 U CN 201538022U CN 2009202230623 U CN2009202230623 U CN 2009202230623U CN 200920223062 U CN200920223062 U CN 200920223062U CN 201538022 U CN201538022 U CN 201538022U
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- injection
- pressure maintaining
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Abstract
The utility model relates to a device for a module chamber temperature controlling and pressure maintaining process, which belongs to the processing field of polymer material. The device for a module chamber temperature controlling and pressure maintaining process is mainly composed of an injection molding machine, a mould, a module chamber temperature sensor and a PVT controller module, wherein the PVT controller module can be used for controlling the changes of pressure maintaining pressure according to set technological parameters according to a temperature signal of the module chamber temperature sensor to be applied to decide the pressure changing occasion of the injection molding machine from speed controlled injection section to pressure controlled pressure maintaining section in the molding process and the pressure maintaining over occasion, and control the total pressure maintaining process. The relationship of material pressure and temperature is mainly thought, and is controlled additionally, so the repeatability of the relationship of the pressure and the temperature is ensured, further, the control of material specific volume is improved, and finally, the product appearance, the size precision and the weight repeatable precision are improved; in particular, the device for a module chamber temperature controlling and pressure maintaining process can have a key function when precise and complex plastic products are processed.
Description
Technical field
The utility model relates to field of high polymer material processing, refers in particular to a kind of device that utilizes the die cavity temperature that the pressure maintaining period of injection (mo(u)lding) machine is controlled.
Background technology
Along with the development of China's all trades and professions, the application of plastic products is more and more general, and is also more and more higher to the requirement of its quality, especially more strict to the requirement of industrial products.Along with the aggravation of social competition, the arrival in product low margin age, the quality of injection-molded item and cost control have become the focus of injection-molded item competition among enterprises.Injection moulding is a kind of plastic shaping method with high content of technology, how to spin off from a large amount of debugging of technological parameter, improves the die trial success rate, realizes the Shooting Technique optimum Design of Parameters, has become the problem that enterprise needs solution badly.The optimal design of control method and technology can shorten the debug time of mould, reduces quantity scrapped, finishes production task smoothly, and enterprise is produced smoothly and reduces cost is very important.In the process of injection molding of plastic products, the control of packing stage is the key that influences quality of item, has only packing stage is carried out good control, and required precisions such as the outward appearance of goods, weight repetition and dimensional tolerance just can be guaranteed.
The control of packing stage mainly comprise injection (mo(u)lding) machine by injection stage to the control of the commentaries on classics pressure point of packing stage and the control of pressurize end point, and the control of whole pressure maintaining period.The correct setting changeed pressure point and adopts the segmentation pressurize to carry out injection moulding production extremely important to the moulding of goods when injection pressure switched to dwell pressure.
For changeing pressure point control, commentaries on classics is pressed and then will be utilized dwell pressure that too much melt is advanced die cavity too early, is easy to like this produce lack and expects; If it is excessive change to press too late then goods to be compressed, form overlap easily and internal stress is too high, demoulding shakiness strengthens defectives such as goods spare weight.The injection control in mold filling stage is based on speed, and packing stage then is controlled to be the master with pressure.The control mode that filling switches to pressurize mainly contains control inject time at present, screw position is controlled and cavity pressure is controlled 3 kinds: inject time, control mode was, switched to holding pressure control when arrive the fixed time inject time; The screw position control mode is to switch to holding pressure control when screw rod is advanced to assigned address; The cavity pressure control mode is to switch to holding pressure control when cavity pressure arrives setting value.Usually, adopt control mode inject time for simple goods; Adopt the screw position control mode for complicated goods; Can provide the cavity pressure control mode for advanced injection machine.Therefore, the control mode of utilizing cavity pressure to change pressure point is considered to optimum at present commentaries on classics pressure point control mode.
The segmentation pressurize can only better improve and carry out the product defect that pressurize causes with single pressure.During the segmentation pressurize, dwell pressure can adopt from high to low or design to low mode more from low to high.When dwell pressure from high to low the time, the overfill that can avoid plastic products cast gate place is to reduce residual stress; When dwell pressure from low to high again when low, can avoid the goods overlap that causes by high dwell pressure, treat can raise dwell pressure earlier when solidify substantially on the goods top layer, and then reduce dwell pressure to reduce the goods internal stress with compensate for shrinkage.Segmentation pressurize is at present mainly controlled by the time, and when arriving the dwell time of setting, packing stage finishes.The setting of dwell time was determined by the gate solidification time.But the gate solidification time is difficult to detect, so mostly the setting of dwell time be that the dependence experience carries out, when the big cast gate of moulding, thick article the feeding time long, the dwell time was 10～20 seconds even longer; Feeding time weak point when the little cast gate of moulding, thin-gage goods, the dwell time is then very short, and general 2～5 seconds are enough.
Can make the goods of each moulding always keep identical quality (volume unanimity, weight unanimity, and identical fiber orientation, residual stress and shrinkage factor), be the target of injection moulding machining control.The basis that reaches this target is exactly PVT (P-pressure, V-specific volume, the T-temperature) characteristic of institute's rapidoprint, and it has described the relation of the specific volume of material to temperature and pressure.The PVT characteristic of every kind of material is certain.Optimum pressure in the forming materials process changes approach and can obtain by the PVT curve map of material.According to the selected best dwell pressure curve of the PVT characteristic of institute's moulding material, can produce under the situation of great change in material behavior even, still can carry out point-device control to the product weight of institute's moulding.Its cardinal principle is to control the variation of material specific volume (V) by the pressure (P) and the temperature (T) of control material, thereby obtains the goods of certain volume constant weight.Improved control accuracy, promptly improved quality of item the pressure and temperature of material.At present, in the control mode of existing injection (mo(u)lding) machine, all be independent control at material pressure and these two variablees of temperature, and also be mainly to concentrate in the raising of independent control accuracy of two variablees of pressure and temperature improving aspect the control accuracy, do not consider the control that concerns between material pressure and the temperature.
Summary of the invention
The purpose of this utility model is, the device of packing stage in a kind of accurate more control injection moulding processing is provided, improve the control method of application at present and many shortcomings of device thereof, significantly promote control formed precision, especially products appearance, dimensional accuracy and the repeating weight precision of injection (mo(u)lding) machine; Particularly when processing precise, complicated plastic products, this holding pressure control device that the utility model provides can play more crucial effect.
The device of a kind of die cavity temperature control of the utility model pressure maintaining period mainly is made up of injection (mo(u)lding) machine, mould, die cavity temperature sensor and PVT controller module; Injection (mo(u)lding) machine is identical with conventional injection (mo(u)lding) machine, comprises adapted to injection system, matched moulds system and control system; The die cavity temperature sensor is installed in the die cavity of mould, is used for the temperature value of test material melt mold filling and packing stage die cavity material melt, and wiring is connected with the temperature signal interface of PVT controller module; The circuit of PVT controller module is connected with the circuit of the injection holding pressure control part of injection (mo(u)lding) machine control system, it is provided with the temperature sensor signal interface, can control the variation of dwell pressure according to the temperature signal of die cavity temperature sensor according to the technological parameter of setting; The control program of PVT controller module comprises temperature and the dwell pressure setting program that changes every section dwell pressure conversion in pressure point temperature setting program, pressurize end point temperature setting program and the segmentation pressure maintaining period, and the control program of dwell pressure; The PVT controller module can be designed to external connection module, also can be used as the part of injection (mo(u)lding) machine control system.
The device of a kind of die cavity temperature control of the utility model pressure maintaining period, be applied to the decision that injection (mo(u)lding) machine presses opportunity and pressurize to finish opportunity by speed control injection stage to the commentaries on classics of pressure controlled packing stage in forming process, and in the control of whole pressure maintaining period.Its application mainly may further comprise the steps: the mould that the die cavity temperature sensor will be installed is installed on the injection (mo(u)lding) machine, before injection moulding processing, utilize the control system of injection (mo(u)lding) machine to configure technological parameter beyond the packing stage control (mainly comprise barrel zone temperature setting and clamp force, folding mould, eject, loose core, injection parameters setting etc.); Select die cavity temperature holding pressure control mode again, utilize the PVT controller module to set the temperature and the corresponding dwell pressure thereof of every section dwell pressure conversion in commentaries on classics pressure point temperature, pressurize end point temperature and the segmentation pressure maintaining period that needs; Moving machine then gets final product.
The device of a kind of die cavity temperature control of the utility model pressure maintaining period, main molding process is as follows: the hopper of material on being installed in machine barrel enters the machine barrel, by the rotation of screw rod and the heating of machine barrel, material plastifying fusion; After injection (mo(u)lding) machine starts, matched moulds system drive mould matched moulds, locked mode; The injection of adapted to injection system drive screw, the material melt of fusion is filled in the die cavity of mould, when the temperature that the die cavity temperature sensor in being installed in die cavity detects the material melt reaches the commentaries on classics pressure point desired temperature that the PVT controller module sets, injection stage finishes, packing stage begins, injection screw is converted to pressure control, and dwell pressure is first section force value of the segmentation pressurize of setting; When the detected material melt temperature of die cavity temperature sensor reached the temperature of first section of setting the conversion of segmentation dwell pressure, PVT controller module control screw rod carried out pressurize according to second section force value of segmentation pressurize, carries out the pressurize of several sections of back with this; When the die cavity temperature reached the pressurize end point temperature of setting, the control packing stage finished, and finished remaining formative stages such as cooling plastifies, die sinking ejects then.
The utility model has the advantages that:
1, with respect to the control mode of utilizing cavity pressure to change pressure point that generally believes that control accuracy is the highest, temperature sensor can be done forr a short time by the specific pressure sensor, and therefore the position that can place is wider, and cost specific pressure sensor is low; In addition, when utilizing cavity pressure to change the control mode of pressure point, when the viscosity of institute's rapidoprint changes, even changeing pressure point pressure is provided with necessarily, the material melt front position of its reflection is that material mold filling position also can change, and the control that utilizes the die cavity temperature to change pressure point then can not.
2, with respect to the mode of utilizing time control dwell pressure end point, utilize die cavity temperature control dwell pressure end point can automatically detect freezing opportunity of material melt in the die cavity, thereby need not to rely on artificial experience or a large amount of die trials to obtain the required best dwell time, improve formed precision and processing efficient, saved the die trial cost.
3, utilize die cavity temperature control packing stage, mainly considered to concern between material pressure and the temperature, and it is controlled, guaranteed the repeatability that concerns between the pressure and temperature, thereby further improved control, finally obtained the raising of products appearance, dimensional accuracy and repeating weight precision the material specific volume.Even the independent control accuracy at two variablees of pressure and temperature does not have under the guaranteed condition, the control method of utilizing the utility model to provide still can access the high goods of precision.Especially it has got rid of the influence of this key factor of temperature to process control, even machine barrel actual temperature or mold temperature change, this control method also can obtain the goods of uniform quality by the adjustment dwell pressure time.
Description of drawings
Fig. 1 is the device schematic diagram of a kind of die cavity temperature control of the utility model pressure maintaining period.
Among the figure: 1. matched moulds system, 2. die cavity, 3. mould, 4. screw rod, 5. machine barrel, 6. hopper, 7. control system, 8.PVT control module, 9. die cavity temperature sensor.
The specific embodiment
The device of a kind of die cavity temperature control of the utility model pressure maintaining period as shown in Figure 1, mainly is made up of injection (mo(u)lding) machine, mould (3), die cavity temperature sensor (9) and PVT controller module (8); Injection (mo(u)lding) machine is identical with conventional injection (mo(u)lding) machine, comprises adapted to injection system, matched moulds system (1) and control system (7); Die cavity temperature sensor (9) is installed in the die cavity (2) of mould (3), is used for the temperature value of test material melt mold filling and packing stage die cavity material melt, and wiring is connected with the temperature signal interface of PVT controller module (8); The circuit of PVT controller module (8) is connected with the circuit of the injection holding pressure control part of injection (mo(u)lding) machine control system (7), it is provided with the temperature sensor signal interface, can control the variation of dwell pressure according to the temperature signal of die cavity temperature sensor (9) according to the technological parameter of setting; The control program of PVT controller module (8) comprises temperature and the dwell pressure setting program that changes every section dwell pressure conversion in pressure point temperature setting program, pressurize end point temperature setting program and the segmentation pressure maintaining period, and the control program of dwell pressure; PVT controller module (8) can be designed to external connection module, also can be used as the part of injection (mo(u)lding) machine control system (7).
The device of a kind of die cavity temperature control of the utility model pressure maintaining period, its application mainly may further comprise the steps: the mould (3) that die cavity temperature sensor (9) will be installed is installed on the injection (mo(u)lding) machine, before injection moulding processing, utilize the control system (7) of injection (mo(u)lding) machine to configure technological parameter beyond the packing stage control (mainly comprise barrel zone temperature setting and clamp force, folding mould, eject, loose core, injection parameters setting etc.); Select die cavity temperature holding pressure control mode again, utilize PVT controller module (8) to set the temperature and the corresponding dwell pressure thereof of every section dwell pressure conversion in commentaries on classics pressure point temperature, pressurize end point temperature and the segmentation pressure maintaining period that needs; Moving machine then gets final product.
The device of a kind of die cavity temperature control of the utility model pressure maintaining period, main molding process is as follows: the hopper (6) of material on being installed in machine barrel (5) enters the machine barrel (5), by the rotation of screw rod (4) and the heating of machine barrel (5), material plastifying fusion; After injection (mo(u)lding) machine started, matched moulds system (1) drove mould (3) matched moulds, locked mode; Adapted to injection system drive screw (4) injection, the material melt of fusion is filled in the die cavity (2) of mould (3), when the temperature that the die cavity temperature sensor (9) in being installed in die cavity (2) detects the material melt reaches the commentaries on classics pressure point desired temperature that PVT controller module (8) sets, injection stage finishes, packing stage begins, injection screw (4) is converted to pressure control, and dwell pressure is first section force value of the segmentation pressurize of setting; When the detected material melt temperature of die cavity temperature sensor (9) reaches the temperature of first section of setting the conversion of segmentation dwell pressure, PVT controller module (8) control screw rod (4) carries out pressurize according to second section force value of segmentation pressurize, carries out the pressurize of several sections of back with this; When the die cavity temperature reached the pressurize end point temperature of setting, the control packing stage finished, and finished remaining formative stages such as cooling plastifies, die sinking ejects then.
Claims (2)
1. the device of a die cavity temperature control pressure maintaining period is characterized in that: mainly be made up of injection (mo(u)lding) machine, mould, die cavity temperature sensor and PVT controller module; Injection (mo(u)lding) machine is identical with conventional injection (mo(u)lding) machine, comprises adapted to injection system, matched moulds system and control system; The die cavity temperature sensor is installed in the die cavity of mould, and wiring is connected with the temperature signal interface of PVT controller module; The circuit of PVT controller module is connected with the circuit of the injection holding pressure control part of injection (mo(u)lding) machine control system, and it is provided with the temperature sensor signal interface.
2. the device of a kind of die cavity temperature control pressure maintaining period according to claim 1, it is characterized in that: the PVT controller module can be designed to external connection module, also can be used as the part of injection (mo(u)lding) machine control system.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009202230623U CN201538022U (en) | 2009-10-12 | 2009-10-12 | Device for module chamber temperature controlling and pressure maintaining process |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009202230623U CN201538022U (en) | 2009-10-12 | 2009-10-12 | Device for module chamber temperature controlling and pressure maintaining process |
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| CN201538022U true CN201538022U (en) | 2010-08-04 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN2009202230623U Expired - Fee Related CN201538022U (en) | 2009-10-12 | 2009-10-12 | Device for module chamber temperature controlling and pressure maintaining process |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102490329A (en) * | 2011-12-13 | 2012-06-13 | 北京化工大学 | Isometric process control method utilizing PVT (pressure-volume-temperature) relation of polymers |
| CN104267177A (en) * | 2014-09-10 | 2015-01-07 | 常州大学 | Plastic melt PVT (pressure, volume and temperature) characteristic experimental device |
| CN104626449A (en) * | 2014-12-11 | 2015-05-20 | 深圳前海安南国际供应链管理服务有限公司 | Injection molding method and system |
| CN104626495A (en) * | 2014-12-12 | 2015-05-20 | 中国航空工业集团公司北京航空材料研究院 | Injection molding production method of transparent product with thick-walled curved surface structure |
| CN106079261A (en) * | 2016-06-24 | 2016-11-09 | 芜湖市万华塑料制品有限公司 | The injection mold being accurately controlled |
| CN114750382A (en) * | 2022-03-31 | 2022-07-15 | 浙江凯华模具有限公司 | Injection pressure control system and control method |
-
2009
- 2009-10-12 CN CN2009202230623U patent/CN201538022U/en not_active Expired - Fee Related
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102490329A (en) * | 2011-12-13 | 2012-06-13 | 北京化工大学 | Isometric process control method utilizing PVT (pressure-volume-temperature) relation of polymers |
| CN104267177A (en) * | 2014-09-10 | 2015-01-07 | 常州大学 | Plastic melt PVT (pressure, volume and temperature) characteristic experimental device |
| CN104626449A (en) * | 2014-12-11 | 2015-05-20 | 深圳前海安南国际供应链管理服务有限公司 | Injection molding method and system |
| CN104626495A (en) * | 2014-12-12 | 2015-05-20 | 中国航空工业集团公司北京航空材料研究院 | Injection molding production method of transparent product with thick-walled curved surface structure |
| CN104626495B (en) * | 2014-12-12 | 2017-05-17 | 中国航空工业集团公司北京航空材料研究院 | Injection molding production method of transparent product with thick-walled curved surface structure |
| CN106079261A (en) * | 2016-06-24 | 2016-11-09 | 芜湖市万华塑料制品有限公司 | The injection mold being accurately controlled |
| CN114750382A (en) * | 2022-03-31 | 2022-07-15 | 浙江凯华模具有限公司 | Injection pressure control system and control method |
| CN114750382B (en) * | 2022-03-31 | 2024-03-19 | 浙江凯华模具有限公司 | Injection molding pressure control system and control method |
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Legal Events
| Date | Code | Title | Description |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20100804 Termination date: 20121012 |