CN101823325B - Electrically-heating and floating type rapid thermal circulation injection mould - Google Patents
Electrically-heating and floating type rapid thermal circulation injection mould Download PDFInfo
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- CN101823325B CN101823325B CN2010101748083A CN201010174808A CN101823325B CN 101823325 B CN101823325 B CN 101823325B CN 2010101748083 A CN2010101748083 A CN 2010101748083A CN 201010174808 A CN201010174808 A CN 201010174808A CN 101823325 B CN101823325 B CN 101823325B
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Abstract
The invention relates to an electrically-heating and floating type rapid thermal circulation injection mould. The injection mould comprises a floating type cavity device, a floating type core device and cooling plate devices, wherein the cooling plate devices are matched with the floating type cavity device and the floating type core device; heating devices are arranged in the floating type cavity device and the floating type core device; cooling devices are arranged in the cooling plate devices; ejection devices, positioning devices and guiding devices are arranged between the floating type cavity device and the corresponding cooling plate device and between the floating type core device and the corresponding cooling plate device; gaps are reserved between the floating type cavity device and the corresponding cooling plate device and between the floating type core device and the corresponding cooling plate device through the ejection devices; the floating type cavity device and the floating type core device limit the ejection distance and keep the moving direction through the positioning devices and the guiding devices; temperature measuring devices are arranged on the floating type cavity device and the floating type core device; and the temperature measuring devices, the heating devices, the cooling devices and a temperature control device are connected with one another.
Description
Technical field
The present invention is the injection molding technology field that belongs to the materials processing subject, relates in particular to a kind of electrothermal, floating type rapid thermal circulation injection mould.
Background technology
Injection molded technology has characteristics such as forming efficiency height, shape of product complicacy, shape and size precision height, has obtained application more and more widely.Along with the fast development of industries such as communication, electronics, household electrical appliances, effects of energy saving and emission reduction in mechanical property, presentation quality, shape and size precision and the production process of plastic products etc. is had higher requirement.
On common plastic injection mould dynamic model and the cover half cooling pipe only is set; Pass to cooling water in the cooling pipe; To guarantee the temperature of mould; The temperature control of mould realizes that through die heater about about 50 ℃, promptly the mold temperature of traditional injection moulding technology adopts constant mould temperature control strategy to general temperature greatly.In order to obtain higher production efficiency; Adopt the mold temperature of traditional injection moulding technology of constant mould temperature control strategy generally lower; Make plastic melt in filling the mould flow process, cooled and solidified prematurely, thus improved the flow resistance of plastic melt; Reduced the fluid ability and the pressure transmission effect of plastic melt, this will cause plastic products to be difficult to avoided the generation of weld mark, mobile trace, depression, defectives such as weak point is penetrated, residual stress is too high, floating fibre.
The rapid thermal cycles injection molding technology is a kind of injection molding technology of dynamic analog temperature control, and is different with conventional injection molding technology, and it is divided into four-stages such as heating, high temperature maintenance, cooling, low temperature maintenance with mold temperature control.This mould temperature control mode; Make plastic melt under Gao Mowen, to fill mould; Improved the flow behavior of plastic melt greatly; Thereby solved conventional Shooting Technique because of filling stage melt temperature and a series of inherent shortcomings that the huge difference of mold temperature causes, greatly improved the quality of plastic, can eliminate the contaminated environment such as polishing, spraying of conventional injection molding technology and the subsequent processes of increase production cost fully.
Realize that the rapid thermal cycles injection molding technology needs to be provided with in the injection mold heating and cooling pipeline, the alternately heating and the cooling of Rapid Realization mold cavity are enhanced productivity.Mold heated waits realization mainly through electrical heating, high-temperature steam, high temperature oil and high-temperature water at present, and cooling adopts cooling water to realize usually.Heating and cooling pipeline in the rapid thermal circulation injection mould mainly contains two types of forms; One type to be that the heating and cooling pipeline is respectively independent be provided with, and when promptly heating, in water back, feeds heat medium or heat through the electrical heating elements of imbedding; During cooling, feed cooling medium at cooling pipe.Another kind of then is that the heating and cooling pipeline is a same group of pipeline, feeds heat medium when promptly heating in the pipeline, in pipeline, feeds cooling medium during cooling, and this type of mode is not suitable for electrical heating rapid thermal cycles mould.Contrast the above-mentioned heating and the type of cooling, the mode of heating of high-temperature steam, high temperature oil and high-temperature water needs assisted with high-temperature medium heating systems such as high-temperature steam boiler, increases cost, occupied ground, and tubing, security clearance, safety guarantee requires high.
Electric heating does not need assisted with high-temperature medium heating systems such as high-temperature steam boiler, easy, easy row, flexible.
U.S. Pat 4,138 is in 892; Disclosed a kind of electrical heating mould of making the concrete test sample, each half all has a hot conductive walls, and its inner surface is a die surface; Outer surface is a mold outer surface; Electrical heating elements is installed between surfaces externally and internally, and electrical heating elements can be operated according to the variation of mould inner concrete internal temperature, to realize the adjusting of temperature.U.S. Pat 4; 723; 070, disclosed the electric heater of a kind of specialized application in device of plastic processing and instrument, this heater is by two hollow, semi-cylindrical heating element heaters; And constitute through the bolt gang in the side, this heater is mainly used in the heating of injection machine and extruder barrel, nozzle and mould.U.S. Pat 5; 989; 008, disclosed a kind of multiple layers of molds structure that plastic material is shaped that is used for, inserting in this mould is made up of sandwich constructions such as heating/cooling layer, heat-conducting layer, base layers; Through electrical heating elements and processing cooling pipe are installed in heating/cooling layer, to realize the heating and cooling of mould.U.S. Pat 5; 261,806, disclosed a kind of electrothermal die insert; This electrothermal die insert mainly is the injection molded that is used for thermosetting plastics; Be characterized in and conveniently in the mould main frame, install or to remove, can process cooling pipe, so that extraneous cooling fluid is introduced die insert inside so that it is carried out cooling down operation in the inside of this die insert.Japan Patent Hei 5-30608 has disclosed a kind of plastic lens injection molding technology of electric assistant heating, before the plastic melt injection, utilizes heating rod that die insert will be heated to one than higher temperature; After filling the pressurize completion; The cooling curing molten resin; And die sinking takes out plastic, and related electrical heating mould is to utilize the heating rod that is embedded in the die insert to realize in this invention, and its cooling is to introduce die insert realization that heating rod belongs to through cooling naturally or with cooling fluid.U.S. Pat 5; 261,806, disclosed a kind of electrothermal die insert; This electrothermal die insert mainly is the injection molded that is used for thermosetting plastics; Be characterized in and conveniently in the mould main frame, install or to remove, can process cooling pipe, so that extraneous cooling fluid is introduced die insert inside so that it is carried out cooling down operation in the inside of this die insert.
In fact; Utilizing the electrical heating elements heating mould is a kind of relatively more conventional mold heated method; Technology related in above-mentioned each patent has all been mentioned the method for utilizing the electric-heating technology heating mould, does not require mold cavity/core is carried out whole heated at high speed and the mould structure design of cooling off at a high speed but all relate to or propose a kind of rapid thermal cycles Shooting Technique that is directed against.Though U.S. Pat 5; 261, the 806 electrical heating moulds mentioned with Japan Patent Hei 5-30608 can be realized the requirement of the change mold temperature control that the rapid thermal cycles Shooting Technique requires; But because cooling pipe is with among heating element heater all is positioned at identical die insert; The heating of mould and the cooling restriction that influences each other, and make whole heating, cooling effectiveness not high, thus increased injection molded cycle and energy resource consumption.U.S. Pat 5; 989, the 008 this multiple layers of molds structures that proposed are though can realize the Fast Heating of mould and cooling fast; But the bond strength between layers of material is lower; Thermal stress fatigue taking place easily destroy, thereby makes that the life-span of mould is lower, the injection molded technology that is not suitable for producing in enormous quantities.
Summary of the invention
Problem such as the present invention is directed to that heating/cooling effectiveness that existing electrothermal injection mold exists is not high, complex structure, cost height, poor safety performance, efficiency of energy utilization are low; A kind of new electrothermal, floating type rapid thermal circulation injection mould are provided; It has characteristics such as heating and cooling are rapid, even, can satisfy the quick response requirement of rapid thermal cycles injection molding technology to the mold cavity temperature.
The present invention realizes through following technical solution:
A kind of electrothermal, floating type rapid thermal circulation injection mould, it comprises floating type die cavity device and floating type core device, and the coldplate device that matches with floating type die cavity device and floating type core device; In floating type die cavity device and floating type core device, be provided with heater; In the coldplate device, be provided with cooling device; Be provided with liftout attachment, positioner and guider between floating type die cavity device and floating type core device and its each self-corresponding coldplate device; Floating type die cavity device and floating type core device and its each self-corresponding coldplate device keep the gap through liftout attachment; Floating type die cavity device and floating type core device eject distance and keep moving direction through location and guider restriction respectively; On floating type die cavity device and floating type core device, also be provided with temperature measuring equipment; Temperature measuring equipment, heater, cooling device are connected with attemperating unit.
The cavity side of said electrothermal, floating type rapid thermal circulation injection mould comprises impression bolster, die cavity coldplate and floating type die cavity; Impression bolster is connected with the die cavity coldplate through positioner; Be provided with liftout attachment between die cavity coldplate and floating type die cavity; The die cavity coldplate is connected with stopping means through guiding with floating type die cavity simultaneously, and floating type die cavity inside is provided with temperature measuring equipment.
The core side of said electrothermal, floating type rapid thermal circulation injection mould comprises core fixing plate, core coldplate and floating type core; Core fixing plate is connected with the core coldplate through positioner; Be provided with liftout attachment between core coldplate and floating type core; The core coldplate is connected with stopping means through guiding with floating type core simultaneously, is provided with temperature measuring equipment in the floating type core.
Said heater is an electrically heated rod, and it is connected with attemperating unit.
Said cooling device is a cooling pipe, is provided with cooling medium in the cooling pipe; Cooling pipe is connected with attemperating unit.
Said stopping means is a gag lever post.
Said positioner is a hold-down screw.
Said guider is a guide pillar.
Said liftout attachment is an ejector spring.
Said temperature measuring equipment is a thermocouple.
The present invention is a kind of floating type, electrothermal injection mold structure that comprises floating type die cavity/core plate, independent coldplate.This mould structure separates the heating part in the injection mold with cooling segment fully; Being about to heating element heater and cooling pipe is arranged in respectively on the die cavity/core plate that needs to heat and the independent coldplate; Avoiding the mutual interference of mold heated and mold cools down effect, thereby improve efficiency of utilization.This die cavity/core can dynamically move back and forth in injection moulding process.In the heating period, die cavity/core moves forward under the effect of ejector spring, so that it separates with independent coldplate fully.After the separation, the air layer that between die cavity/core plate and coldplate, forms can play the heat-insulation and heat-preservation effect, thereby the heating period heat scatters and disappears, and improves the efficiency of heating surface.Cooling stage, under the effect of mold clamping force, floating type die cavity/core will reset, so that itself and coldplate fit tightly, thereby cool off die cavity/core fast, so that the die sinking pickup.The volume of floating type die cavity/core and quality reducing its thermal capacity, thereby improve heating/cooling effectiveness.Adopt independent coldplate, because of it separates with die cavity/core, its material selects not receive the restriction of die cavity/core material requirement; So optional usefulness has the metal material of high thermoconductivity, low heat capacity; For example aluminium alloy, copper alloy etc. are as the material of coldplate, to improve cooling effectiveness.Floating type die cavity/core designs guide pillar and gag lever post.Wherein guide post can play guide effect in die cavity/core moves back and forth; Simultaneously, gag lever post can limit the distance that die cavity/core is ejected, and can reset smoothly to guarantee its die cavity/core plate.For avoiding floating type die cavity/core and the rapid variation of coldplate contact-making surface shape separately, for example wedge angle, little arc transition etc. guarantee that die cavity/core contacts with the good of coldplate, with the thermal resistance of minimizing contact-making surface, thereby improve heat transfer efficiency.
The invention has the beneficial effects as follows: simple in structure, easy to use, have characteristics such as heating and cooling are rapid, even, can satisfy of the quick response requirement of rapid thermal cycles injection molding technology to the mold cavity temperature.
Description of drawings
Fig. 1 is the structure chart of the present invention in the heating period;
Fig. 2 is the present invention keeps the stage at high temperature a structure chart;
Fig. 3 is the structure chart of the present invention at cooling stage;
Fig. 4 is the present invention keeps the stage at low temperature a structure chart.
Wherein: 1. impression bolster, 2. die cavity coldplate, 3. floating type cavity plate, 4. floating type core plate; 5. core coldplate, 6. core fixing plate, 7. plastic melt, 8. gag lever post; 9. ejector spring, 10. guide pillar, 11. cooling pipes, 12. electrically heated rods; 13. thermocouple, 14. hold-down screw I, 15 hold-down screw II.
The specific embodiment
Below in conjunction with accompanying drawing and embodiment the present invention is further specified:
Among Fig. 1, Fig. 2, Fig. 3, Fig. 4, it comprises electrothermal, the floating type rapid thermal circulation injection mould operation principle in injection molding process.
The cavity side of electrothermal, floating type rapid thermal circulation injection mould comprises impression bolster 1, die cavity coldplate 2 and floating type cavity plate 3.Impression bolster 1 is connected with die cavity coldplate 2 through hold-down screw I 14, and die cavity coldplate 2 is connected with floating type cavity plate 3 through gag lever post 8, guide pillar 10, is provided with ejector spring 9 between die cavity coldplate 2 and the floating type cavity plate 3.Under die opening state, because the effect of ejector spring 9 makes die cavity coldplate 2 and 3 of floating type cavity plate leave the gap; Under mode-lock status, die cavity coldplate 2 fits tightly together under the effect of locked mode pressure with floating type cavity plate 3.
The core side of electrothermal, floating type rapid thermal circulation injection mould comprises core fixing plate 6, core coldplate 5 and floating type core plate 4; Core fixing plate 6 is connected with core coldplate 5 through hold-down screw II 15; Core coldplate 5 is connected with floating type core plate 4 through gag lever post 8, guide pillar 10, is provided with ejector spring 9 between core coldplate 5 and the floating type core plate 4.Under die opening state, because the effect of ejector spring 9 makes die cavity coldplate 2 and 3 of floating type cavity plate leave the gap; Under mode-lock status, core coldplate 5 fits tightly together under the effect of locked mode pressure with floating type core plate 4.
Be provided with thermocouple 13 in floating type core plate 4 inside, thermocouple 13 is connected with attemperating unit; Be provided with thermocouple 13 equally in floating type cavity plate 3 inside, this thermocouple 13 also is connected with attemperating unit.Simultaneously, in floating type cavity plate 3 and floating type core plate 4, be respectively equipped with electrically heated rod 12, in die cavity coldplate 2 and core coldplate 5, be respectively equipped with cooling duct 11, pass to cooling medium in the cooling duct 11.Each electrically heated rod 12 all is connected with attemperating unit with cooling duct 11.
Operation principle of the present invention is following:
According to the variable condition of mold temperature, the rapid thermal cycles injection moulding can be divided into four working stages such as heating, high temperature maintenance, cooling, low temperature maintenance.To at length set forth in the course of work of each working stage electrothermal of the present invention, floating type injection mold below.
Fig. 1 is the heating period.After moulds open, floating type cavity plate 3 will be ejected a segment distance with floating type core plate 4 under the effect of ejector spring 9
SThereby, floating type cavity plate 3, floating type core plate 4 die cavity coldplate 2, the core coldplate 5 corresponding with it are separated, can form one deck air layer betwixt, as shown in Figure 1.At this moment, give electrically heated rod 12 energisings, heat floating type cavity plate 3 and floating type core plate 4, formed air layer can play the effect of heat-insulation and heat-preservation in the heating process, can effectively reduce heat and scatter and disappear, thereby improve the efficiency of heating surface.In floating type cavity plate 3 and the floating type core plate 4 quilt processes that eject, gag lever post 8 can play effect spacing and guiding respectively with guide pillar 10, and gag lever post 8 can limit the distance that ejects of floating type cavity plate 3 and floating type core plate 4
S, guide pillar 10 can guarantee their direction of motion, thereby helps the reset operation of floating type cavity plate 3 and floating type core plate 4, and improves ejecting and reseting precision of floating type cavity plate 3 and floating type core plate 4.In heating process, each thermocouple 13 can feed back the temperature of die cavity/core dynamically, realizes the dynamic real-time monitor to die cavity/core temperature, when temperature value reaches the requirement of rapid thermal cycles Shooting Technique, stops heating, keeps the stage thereby get into high temperature.
Fig. 2 keeps the stage for high temperature.In this stage, mould is closed under the effect of clamping, and in the matched moulds process, floating type cavity plate 3 is pushed back original position with floating type core plate 4 under the effect of injection moulding machine mode-locking structure.Subsequently, plastic melt 7 will be injected in the mold cavity, fill mould and flow, and will be as shown in Figure 2.
Fig. 3 is a cooling stage.After melt is full of mold cavity fully; After promptly accomplishing filling and pressurize operation; Feed low-temperature cooling water in the cooling pipe 11 in independent die cavity coldplate 2, core coldplate 5; With quick cooling die cavity/core plate, thereby the plastic melt in the mold cavity 7 is cooled to the temperature that ejects of plastics rapidly.Fig. 3 has provided the mould state of this moment.Because floating type cavity plate 3, floating type core plate 4 are what to separate with die cavity coldplate 2, core coldplate 5; Die cavity coldplate 2, core coldplate 5 materials can be selected and floating type cavity plate 3, floating type core plate 4 material different; For example aluminium alloy, copper alloy etc. have the metal material of excellent heat dispersion performance, to improve cooling effectiveness.At cooling stage, when the temperature value of thermocouple 13 feedback reaches the rapid thermal cycles Shooting Technique and requires, show in the mold cavity plastic melt 7 condensation finish, can stop cooling this moment, and get into low temperature and keep the stage.
Fig. 4 keeps the stage for low temperature.Keep the stage at low temperature, under the clamping mechanism effect, mould will be opened, and take out plastic.The mould state of this moment is as shown in Figure 4.Simultaneously, in the die sinking process, floating type cavity plate 3, floating type core plate 4 will be ejected by ejector spring 9 once more, so that prepare for the mold heated of next rapid thermal cycles injection molded process.
Claims (5)
1. an electrothermal, floating type rapid thermal circulation injection mould is characterized in that it comprises floating type die cavity device and floating type core device, and the coldplate device that matches with floating type die cavity device and floating type core device; In floating type die cavity device and floating type core device, be provided with heater; In the coldplate device, be provided with cooling device; Be provided with liftout attachment, positioner and guider between floating type die cavity device and floating type core device and its each self-corresponding coldplate device; Floating type die cavity device and floating type core device and its each self-corresponding coldplate device keep the gap through liftout attachment; Floating type die cavity device and floating type core device eject distance and keep moving direction through location and guider restriction respectively; On floating type die cavity device and floating type core device, also be provided with temperature measuring equipment; Temperature measuring equipment, heater, cooling device are connected with attemperating unit;
Said floating type die cavity device comprises impression bolster (1), die cavity coldplate (2) and floating type cavity plate (3); Impression bolster (1) is connected with die cavity coldplate (2) through positioner; Be provided with liftout attachment between die cavity coldplate (2) and floating type cavity plate (3); Die cavity coldplate (2) is connected with stopping means through guider with floating type cavity plate (3) simultaneously, and floating type cavity plate (3) inside is provided with temperature measuring equipment;
Said floating type core device comprises core fixing plate (6), core coldplate (5) and floating type core plate (4); Core fixing plate (6) is connected with core coldplate (5) through positioner, is provided with liftout attachment between core coldplate (5) and floating type core plate (4), and core coldplate (5) is connected with stopping means through guider with floating type core plate (4) simultaneously; Floating type core plate (4) inside is provided with temperature measuring equipment; The temperature of dynamic feedback die cavity/core realizes the dynamic real-time monitor to die cavity/core temperature, when temperature value reaches the requirement of rapid thermal cycles Shooting Technique; Stop heating, keep the stage thereby get into high temperature;
Said stopping means is gag lever post (8);
Said liftout attachment is ejector spring (9);
Gag lever post (8) limits the distance that ejects of floating type cavity plate (3) and floating type core plate (4)
S, guide pillar (10) guarantees their direction of motion, thereby helps the reset operation of floating type cavity plate (3) and floating type core plate (4), and improves ejecting and reseting precision of floating type cavity plate (3) and floating type core plate (4).
2. electrothermal as claimed in claim 1, floating type rapid thermal circulation injection mould is characterized in that, said heater is electrically heated rod (12), and it is connected with attemperating unit.
3. electrothermal as claimed in claim 1, floating type rapid thermal circulation injection mould is characterized in that, said cooling device is cooling pipe (11), and cooling pipe is connected with cooling medium in (11); The reversal valve of control cooling pipe (11) break-make is connected with attemperating unit.
4. electrothermal as claimed in claim 1, floating type rapid thermal circulation injection mould is characterized in that, said guider is guide pillar (10).
5. electrothermal as claimed in claim 1, floating type rapid thermal circulation injection mould is characterized in that, said temperature measuring equipment is thermocouple (13).
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| Application Number | Priority Date | Filing Date | Title |
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| CN2010101748083A CN101823325B (en) | 2010-05-18 | 2010-05-18 | Electrically-heating and floating type rapid thermal circulation injection mould |
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| Application Number | Priority Date | Filing Date | Title |
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| CN2010101748083A CN101823325B (en) | 2010-05-18 | 2010-05-18 | Electrically-heating and floating type rapid thermal circulation injection mould |
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| CN101823325A CN101823325A (en) | 2010-09-08 |
| CN101823325B true CN101823325B (en) | 2012-08-15 |
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Families Citing this family (8)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102744844A (en) * | 2012-07-16 | 2012-10-24 | 青岛海信模具有限公司 | Highlight die and temperature control system thereof |
| CN103552222B (en) * | 2013-10-28 | 2016-01-06 | 华南理工大学 | The electric heat type heat cycle mould that water jet cools fast and cooling means thereof |
| CN103624925A (en) * | 2013-11-04 | 2014-03-12 | 苏州好特斯模具有限公司 | Novel cooling water way cushion block |
| CN104626469B (en) * | 2015-01-27 | 2017-11-03 | 苏州汇众模塑有限公司 | A kind of Intelligent temperature control type thin wall type injection mold |
| CN104723510B (en) * | 2015-04-10 | 2016-10-05 | 北京化工大学 | Based on Graphene coating rapid thermal cycles Coinjection molding apparatus |
| CN108687329A (en) * | 2018-08-13 | 2018-10-23 | 华南理工大学广州学院 | Has the casting device of temperature control core |
| CN110480986A (en) * | 2019-08-19 | 2019-11-22 | 中机精密成形产业技术研究院（安徽）股份有限公司 | A kind of online shaping dies of long fiber reinforcement composite material and temprature control method |
| CN114074406B (en) * | 2020-08-18 | 2024-02-27 | 苏州亮福电器有限公司 | High-gloss injection mold adopting electric heating mode |
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| KR100644920B1 (en) * | 2005-03-24 | 2006-11-10 | 김동학 | Mold for injection molding machine |
| KR100792077B1 (en) * | 2006-05-16 | 2008-01-04 | 엘지전자 주식회사 | Die assembly |
| CN101531050A (en) * | 2009-04-15 | 2009-09-16 | 林建岳 | An on-off cooling structure electric heating highlight injection mold |
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