CN101823325A - Electrically-heating and floating type rapid thermal circulation injection mould - Google Patents

Electrically-heating and floating type rapid thermal circulation injection mould Download PDF

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Publication number
CN101823325A
CN101823325A CN 201010174808 CN201010174808A CN101823325A CN 101823325 A CN101823325 A CN 101823325A CN 201010174808 CN201010174808 CN 201010174808 CN 201010174808 A CN201010174808 A CN 201010174808A CN 101823325 A CN101823325 A CN 101823325A
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CN
China
Prior art keywords
floating type
core
coldplate
die cavity
cooling
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CN 201010174808
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Chinese (zh)
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CN101823325B (en
Inventor
赵国群
王桂龙
管延锦
李辉平
李熹平
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山东大学
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Publication of CN101823325B publication Critical patent/CN101823325B/en

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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

A kind of electrothermal, floating type rapid thermal circulation injection mould
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 complexity, 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 by 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 the mold filling flow process, cooled and solidified prematurely, thereby 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 be 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 that plastic melt can be in mold filling under the Gao Mowen, improved the flow behavior of plastic melt greatly, thereby solved conventional Shooting Technique because of filling a series of inherent shortcomings that the huge difference of stage melt temperature and mold temperature causes, greatly improved the quality of plastic, can eliminate the contaminated environment such as polishing, spraying of conventional injection molding technology fully and increase the subsequent processes of production cost.
Realize that the rapid thermal cycles injection molding technology needs to be provided with in the injection mold heating and cooling pipeline, realize the alternately heating and cooling of mold cavity fast, enhance productivity.Mold heated waits realization mainly by 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 class forms, to be that the heating and cooling pipeline is respectively independent be provided with one class, when promptly heating, feeds heat medium or heat by the electrical heating elements of imbedding in water back, 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, feeds cooling medium during cooling in pipeline, 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, in 892, disclosed a kind of electrical heating mould of making the concrete test sample, each half module tool 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 a kind of electric heater that is specifically applied to device of plastic processing and instrument, this heater is by two hollow, semi-cylindrical heating element heaters, and constitute by 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, by 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 Hei5-30608 has disclosed the plastic lens injection molding technology of the auxiliary heating of a kind of electricity, before the plastic melt injection, utilizes heating rod that die insert will be heated to one than higher temperature; After the filling pressurize is finished, the cooling curing molten resin, and die sinking takes out plastic, 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 by cooling off or cooling fluid is introduced the die insert realization at heating rod place naturally.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 a kind ofly require mold cavity/core is carried out the whole heated at high speed and the mould structure design of cooling at a high speed at the rapid thermal cycles Shooting Technique but all relate to or propose.Though U.S. Pat 5,261,806 and the electrical heating mould mentioned of Japan Patent Hei5-30608, can realize 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 structure that is proposed, 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 by 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 by liftout attachment; Floating type die cavity device and floating type core device eject distance and keep moving direction by 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 described 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 by positioner, be provided with liftout attachment between die cavity coldplate and floating type die cavity, the die cavity coldplate is connected with stopping means by guiding with floating type die cavity simultaneously, and floating type die cavity inside is provided with temperature measuring equipment.
The core side of described 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 by positioner, be provided with liftout attachment between core coldplate and floating type core, the core coldplate is connected with stopping means by guiding with floating type core simultaneously, is provided with temperature measuring equipment in the floating type core.
Described heater is an electrically heated rod, and it is connected with attemperating unit.
Described cooling device is a cooling pipe, is provided with cooling medium in the cooling pipe; Cooling pipe is connected with attemperating unit.
Described stopping means is a gag lever post.
Described positioner is a hold-down screw.
Described guider is a guide pillar.
Described liftout attachment is an ejector spring.
Described 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 fully with cooling segment, being about to heating element heater and cooling pipe is arranged in respectively on the die cavity/core plate that needs heating 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 fully with independent coldplate.After the separation, the air layer that forms between die cavity/core plate and coldplate 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 to be subjected to 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 pipe, 12. electrically heated rods, 13. thermocouples, 14. hold-down screw I, 15 hold-down screw II.
The specific embodiment
The present invention will be further described below in conjunction with accompanying drawing and embodiment:
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 by hold-down screw I14, and die cavity coldplate 2 is connected with floating type cavity plate 3 by 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 by hold-down screw II15, core coldplate 5 is connected with floating type core plate 4 by 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 as follows:
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 mould is opened, floating type cavity plate 3 and floating type core plate 4 will be ejected a segment distance 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 the process that floating type cavity plate 3 and floating type core plate 4 are ejected, gag lever post 8 and guide pillar 10 can play effect spacing and guiding respectively, 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 enter 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 and floating type core plate 4 are pushed back original position under the effect of injection moulding machine mode-locking structure.Subsequently, plastic melt 7 will be injected in the mold cavity, carry out mold filling and will flow, as shown in Figure 2.
Fig. 3 is a cooling stage.After melt is full of mold cavity fully, after promptly finishing 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 the material different with floating type cavity plate 3, floating type core plate 4, 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 enter 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 as shown in Figure 4.Simultaneously, in the die sinking process, floating type cavity plate 3, floating type core plate 4 will be ejected spring 9 once more and eject, so that prepare for the mold heated of next rapid thermal cycles injection molded process.
 

Claims (9)

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 by liftout attachment; Floating type die cavity device and floating type core device eject distance and keep moving direction by 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.
2. electrothermal as claimed in claim 1, floating type rapid thermal circulation injection mould, it is characterized in that, described 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) by 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 by guider with floating type cavity plate (3) simultaneously, and floating type cavity plate (3) inside is provided with temperature measuring equipment.
3. electrothermal as claimed in claim 1, floating type rapid thermal circulation injection mould, it is characterized in that, described 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) by positioner, be provided with liftout attachment between core coldplate (5) and floating type core plate (4), core coldplate (5) is connected with stopping means by guider with floating type core plate (4) simultaneously, and floating type core plate (4) inside is provided with temperature measuring equipment.
4. as claim 1 or 2 or 3 described electrothermals, floating type rapid thermal circulation injection mould, it is characterized in that described heater is electrically heated rod (12), it is connected with attemperating unit.
5. as claim 1 or 2 or 3 described electrothermals, floating type rapid thermal circulation injection mould, it is characterized in that described cooling device is cooling pipe (11), cooling pipe is connected with cooling medium in (11); The reversal valve of control cooling pipe (11) break-make is connected with attemperating unit.
6. as claim 1 or 2 or 3 described electrothermals, floating type rapid thermal circulation injection mould, it is characterized in that described stopping means is gag lever post (8).
7. as claim 1 or 2 or 3 described electrothermals, floating type rapid thermal circulation injection mould, it is characterized in that described guider is guide pillar (10).
8. as claim 1 or 2 or 3 described electrothermals, floating type rapid thermal circulation injection mould, it is characterized in that described liftout attachment is ejector spring (9).
9. as claim 1 or 3 described electrothermals, floating type rapid thermal circulation injection mould, it is characterized in that described temperature measuring equipment is thermocouple (13).
CN2010101748083A 2010-05-18 2010-05-18 Electrically-heating and floating type rapid thermal circulation injection mould CN101823325B (en)

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CN101823325B CN101823325B (en) 2012-08-15

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Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
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
CN103552222A (en) * 2013-10-28 2014-02-05 华南理工大学 Water jet rapid cooling electric heat type heat cycle mould and cooling method 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
CN104626469A (en) * 2015-01-27 2015-05-20 苏州汇众模塑有限公司 Intelligent temperature control type thin-walled injection molding mold
CN104723510A (en) * 2015-04-10 2015-06-24 北京化工大学 Rapid heating-cycle molding set based on graphene coating

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2006112571A1 (en) * 2005-03-24 2006-10-26 Myung-Ho Kang Mold for injection molding machine
CN101073910A (en) * 2006-05-16 2007-11-21 Lg电子株式会社 Mould assembly
CN101531050A (en) * 2009-04-15 2009-09-16 林建岳 An on-off cooling structure electric heating highlight injection mold

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2006112571A1 (en) * 2005-03-24 2006-10-26 Myung-Ho Kang Mold for injection molding machine
CN101073910A (en) * 2006-05-16 2007-11-21 Lg电子株式会社 Mould assembly
CN101531050A (en) * 2009-04-15 2009-09-16 林建岳 An on-off cooling structure electric heating highlight injection mold

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
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
CN103552222A (en) * 2013-10-28 2014-02-05 华南理工大学 Water jet rapid cooling electric heat type heat cycle mould and cooling method 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
CN104626469A (en) * 2015-01-27 2015-05-20 苏州汇众模塑有限公司 Intelligent temperature control type thin-walled injection molding mold
CN104723510A (en) * 2015-04-10 2015-06-24 北京化工大学 Rapid heating-cycle molding set based on graphene coating
CN104723510B (en) * 2015-04-10 2016-10-05 北京化工大学 Based on Graphene coating rapid thermal cycles Coinjection molding apparatus

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