CN105904646B - A kind of micro injection molding device and method based on die cavity air pressure dynamic control - Google Patents
A kind of micro injection molding device and method based on die cavity air pressure dynamic control Download PDFInfo
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- CN105904646B CN105904646B CN201610223273.1A CN201610223273A CN105904646B CN 105904646 B CN105904646 B CN 105904646B CN 201610223273 A CN201610223273 A CN 201610223273A CN 105904646 B CN105904646 B CN 105904646B
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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
- B29C45/0025—Preventing defects on the moulded article, e.g. weld lines, shrinkage marks
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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
- B29C45/0046—Details relating to the filling pattern or flow paths or flow characteristics of moulding material in the mould cavity
-
- 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
- B29C45/26—Moulds
-
- 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
- B29C45/46—Means for plasticising or homogenising the moulding material or forcing it into the mould
- B29C45/57—Exerting after-pressure on the moulding material
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- 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
-
- 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
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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
- B29C2945/76655—Location of control
- B29C2945/76732—Mould
- B29C2945/76735—Mould cavity
-
- 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
- B29C2945/76822—Phase or stage of control
- B29C2945/76859—Injection
-
- 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
- B29C2945/76822—Phase or stage of control
- B29C2945/76896—Ejection
Landscapes
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Mechanical Engineering (AREA)
- Moulds For Moulding Plastics Or The Like (AREA)
- Injection Moulding Of Plastics Or The Like (AREA)
Abstract
The invention discloses a kind of micro injection molding device and method based on die cavity air pressure dynamic control, device includes the micro injection molding device based on die cavity air pressure dynamic control, it includes dynamic model and quiet mould, the centre of described dynamic model is provided with moving die insert, the centre of described quiet mould is provided with quiet mould insert, die chamber is had in quiet mould insert and moving die insert, the described die intracavitary of quiet mould insert is provided with quiet mould die, air cavity in core rod is provided with die, air cavity is connected with air cavity in dynamic model in core rod, the quiet mould air cavity mouth of air cavity is connected by being provided with the pipeline of magnetic valve with air pump respectively in the dynamic model air cavity mouth of air cavity and quiet mould in described dynamic model, described air pump is connected with the control system of installation dynamic model and the injection machine of quiet mould.This structures and methods promotes the filling quality of polymer melt and promotes stripping result.
Description
Technical field
The present invention relates to a kind of device and method of the micro- injection of polymer, more particularly to available for high-aspect-ratio polymeric material
Expect the micro injection molding processing unit (plant) and method of micro structural component.
Background technology
With the development of nanometer technique, micro element is widely used in biologic medical, electronic communication, Aero-Space etc.
Field.At present, the method for processing micro element is varied, but most microfabrication mode still suffers from many defects, such as
Processing technology is complicated, be difficult to repetitive lotses production, efficiency is low, cost is high etc., seriously limits the development of nanometer technique.
In order to solve the deficiency of existing microfabrication mode, micro injection molding technology is arisen at the historic moment.Micro injection molding technology
Repetitive lotses production can be carried out as one kind, manufacturing technology that is complicated and having precise fine structure plastic is can shape, because of it
The advantages that manufacturing cost is low, with short production cycle, reproducible and technique is simple and obtain the extensive use of people.But existing rank
The micro injection molding technology of section is simultaneously immature, and the conventional injection of tradition is theoretical and technique is no longer desirable for micro injection molding.Tradition note
The isothermal mold filling condition of modeling forming technique is not suitable for micro injection molding：With the reduction of die cavity, the surface area of polymer melt
Quickly increase with volume ratio, and it carries the relative reduction of heat, melt temperature reduces rapidly, causes mould microlaser cavity interpolymer
Melt viscosity increases sharply, and reduces the mobile performance of polymer melt, have impact on Filling quality；Meanwhile melt connects with die cavity
The condensate layer generated when tactile also can further hinder mold filling.Especially in the case where being molded high-aspect-ratio plastic, microlaser cavity is brought
Influence be particularly acute, high aspect ratio structure die cavity easily causes structural exhaust problem, and trapped gas is also easy to produce in die cavity, hinder
Further flowing of the polymer melt in die cavity, pressure increases in die cavity, causes mold filling to be discontented with, the shape that have impact on product is answered
Precision processed.Moreover, for the plastic of high-aspect-ratio, when entering ejection phase after injection, pressurize, cooling stage,
Larger frictional force is more prone to because high-aspect-ratio plastic has a larger surface-to-volume ratio, during the demoulding, thus it is advanced
The plastic demoulding of wide ratio is more difficult；The plastic of high-aspect-ratio shaping simultaneously has the feature of " carefully growing ", the tensile strength of plastic
It is relatively weak, plastic easily occurs it is pulled off situation in the demoulding, not only broken up plastic integrality, the plastic of fracture blocks mould
Core pattern chamber, even whole core rod is destroyed when serious.
At present, the researcher of various countries and practitioner have carried out a large amount of theoretical researches and technique and attempted, from Shooting Technique and
The aspect of injection moulding process two sets about improving the injection molding quality of high aspect ratio microstructures plastic, in terms of Shooting Technique, it is proposed that
By improving mold temperature, polymer-melt temperature, issuing velocity and the method improvement mold filling matter for projecting the technological parameters such as pressure
Amount；Heating auxiliary, hot flow path, ultrasonic wave added micro injection molding method etc. are proposed in terms of injection moulding process, these effort are one
Determine to improve the Filling quality of high-aspect-ratio injection molding in degree, but spy all is proposed to injection-moulding device in order to reach effect
It is different to require, realize that difficulty or cost are larger, and all without fundamentally solving influence of the die cavity trapped gas to mold filling process, more
It is not involved with the improvement to plastic quality of mold release.
The content of the invention
The shortcomings that it is an object of the invention to overcome prior art, there is provided one kind can improve Filling quality and production
The micro injection molding device and method based on die cavity air pressure dynamic control of efficiency.
The present invention is achieved by the following technical solutions：
The micro injection molding device based on die cavity air pressure dynamic control of the present invention, it includes dynamic model and quiet mould, described
When dynamic model and quiet mould close, dynamic model internal face and quiet mould internal face contact with each other to form die joint, described dynamic model and quiet mould
Location mid-shaft is identical, and the centre of described dynamic model is provided with moving die insert, and quiet mould edge is provided with the centre of described quiet mould
Block, a guiding post holes is had at the corner of described quiet mould, is distinguished at the corner of the internal face of described dynamic model
The lead for being oriented to post holes can be inserted one by one by being provided with, and sprue bush is provided with the centre position of described quiet mould, described
The centre position of dynamic model is provided with sprue puller hole, sprue puller is inserted with described sprue puller hole, in the outlet of described sprue bush
Quiet mould runner is had along the transverse direction of quiet mould insert on the internal face of the quiet mould insert of the left and right sides, in described moving die insert
Sprue puller hole at left and right sides of moving die insert internal face on dynamic model runner is laterally had along moving die insert, in sprue bush
Along perpendicular to the longitudinal direction of quiet mould insert and on the moving die insert at left and right sides of sprue puller hole in the quiet mould insert of the left and right sides
Along die chamber is had perpendicular to the longitudinal direction of moving die insert, the described die intracavitary of quiet mould insert is provided with quiet mould mould
Benevolence, the described die intracavitary of moving die insert is provided with dynamic model die, micro- knot is provided among the internal face of each die
When configuration chamber, dynamic model and quiet mould close, quiet mould runner and dynamic model runner are oppositely arranged and inlayed positioned at quiet mould insert and dynamic model
The micro-structural die cavity of block homonymy is oppositely arranged to form mold cavity in closure, and air cavity in core rod is provided with described die,
Air cavity one end is connected by the runner being opened in die with micro-structural die cavity in described core rod, is arranged on described in dynamic model
The other end of air cavity is connected with air cavity in the dynamic model in dynamic model is opened in core rod, is arranged on gas in the described core rod in quiet mould
The other end of chamber is connected with air cavity in the quiet mould in quiet mould is opened in, and one end of described quiet mould runner and the outlet of sprue bush connect
The logical and other end is connected with the micro-structural die cavity of quiet mould die, and one end of described dynamic model runner and the outlet of sprue bush connect
The logical and other end is connected with the micro-structural die cavity of dynamic model die, in described dynamic model in the dynamic model air cavity mouth and quiet mould of air cavity
The quiet mould air cavity mouth of air cavity is connected by being provided with the pipeline of magnetic valve with air pump respectively, described air pump and installation dynamic model and quiet
The control system of the injection machine of mould is connected.
A kind of micro injection molding method based on die cavity air pressure dynamic control, it comprises the following steps:
(1) dynamic model, quiet mould is separately fixed on the moving platen of injection machine and the quiet template of injection machine；
(2) using the thick adjustment function of mould of injection machine, dynamic model and quiet mould are adjusted to correct die-closed position；
(3) after dynamic model and quiet mould matched moulds, the sprue bush on the quiet mould of nozzle alignment of injection machine is controlled；
(4) ejecting device of synchronous averaging injection machine, quiet mould air pump and dynamic model air pump, by molten polymer melt by pouring
Muzzle, the micro-structural die cavity of the micro-structural die cavity and dynamic model die by quiet mould die is injected into via quiet mould runner and dynamic model runner
In the mold cavity of composition；Simultaneously quiet mould air pump and dynamic model air pump according to the pressure set to being evacuated in mold cavity,
Negative pressure is formed in mold cavity, then pressurize；
(5) after pressurize terminates, quiet mould air pump and dynamic model air pump are closed, cools down the molten polymer melt in mold cavity；
(6) after completing cooling, start quiet mould air pump and dynamic model air pump, to mould type interacvity air-filling, make mold cavity internal pressure
Power switchs to malleation, forms push effect to micro-structural moulding end, injection machine enters the die sinking stage, by sprue puller and injection machine
Ejecting mechanism plastic will be made remove, product is completed.
Beneficial effects of the present invention specifically have the following aspects：
The present invention outstanding advantages be：Micro- injection moulding process based on die cavity air pressure dynamic control of the invention by design,
Different phase in high aspect ratio microstructures injection moulding process is adjusted to the pressure in die cavity respectively according to Shooting Technique demand
Section：Make by the pumping action of air pump to form negative pressure in high-aspect-ratio die cavity in the ejection formation stage, form inside and outside bigger pressure
Power is poor, promotes polymer melt to improve the mold filling effect of polymer melt to the abundant flowing inside high-aspect-ratio die cavity；And
Ejection phase after pressurize, cooling makes to form malleation in high-aspect-ratio die cavity by the inflation action of air pump, what is be molded
High aspect ratio microstructures plastic end face forms pushing force, coordinates the stretching knockout press of injection machine to complete the demoulding, avoids injection machine from taking off
Very big demoulding pulling force is needed during mould, it is special so as to destroy the phenomenon (plastic is broken, die cavity blocks) of high-aspect-ratio plastic and mould
It is not that the polymer micro-structural plastic production weaker to intensity has fabulous effect.
Brief description of the drawings
Fig. 1 is installation signal of the micro injection molding device based on die cavity air pressure dynamic control of the present invention on injection machine
Figure；
Fig. 2 is the quiet mould dimensional structure diagram in apparatus of the present invention shown in Fig. 1；
Fig. 3 is the dynamic model dimensional structure diagram in apparatus of the present invention shown in Fig. 1；
Fig. 4 is the diagrammatic cross-section after quiet mould and dynamic model matched moulds in apparatus of the present invention shown in Fig. 1；
Fig. 5-1 is the die stereogram in apparatus of the present invention shown in Fig. 1；
Fig. 5-2 is the diagrammatic cross-section of the die shown in Fig. 5-1.
Embodiment
Below in conjunction with the accompanying drawings, the embodiment of the present invention is described in detail.
The micro injection molding device based on die cavity air pressure dynamic control of the present invention as shown in drawings, it includes dynamic model 8
With quiet mould 10, when described dynamic model 8 and quiet mould 10 close, the internal face of dynamic model 8 and the internal face of quiet mould 10 contact with each other to form parting
Face 30, described dynamic model 8 is identical with the location mid-shaft of quiet mould 10, and the centre of described dynamic model 8 is provided with moving die insert 29,
The centre of described quiet mould 10 is provided with quiet mould insert 22, and a guiding post holes is had at the corner of described quiet mould 10
17, the lead 9 for being oriented to post holes 17 can be inserted one by one by being respectively arranged with the corner of the internal face of described dynamic model 8,
The centre position of described quiet mould 10 is provided with sprue bush 19, sprue puller hole is provided with the centre position of described dynamic model 8, described
Sprue puller hole in be inserted with sprue puller 27, on the internal face of the quiet mould insert 22 at left and right sides of the outlet of described sprue bush 19
Quiet mould runner 20 is had along the transverse direction of quiet mould insert 22, it is dynamic at left and right sides of the sprue puller hole of described moving die insert 29
Dynamic model runner 28 laterally is had along moving die insert 29 on the internal face of mould insert 29, the quiet mould in the left and right sides of sprue bush 19
In insert 22 along moving die insert 29 perpendicular to the longitudinal direction of quiet mould insert 22 and at left and right sides of sprue puller hole along perpendicular to
The longitudinal direction of moving die insert 29 has die chamber, and the described die intracavitary of quiet mould insert 22 is provided with quiet mould die 21,
The described die intracavitary of moving die insert 29 is provided with dynamic model die 26, micro- knot is provided among the internal face of each die
When configuration chamber 34, dynamic model 8 and quiet mould 10 close, quiet mould runner 20 and dynamic model runner 28 are oppositely arranged and are located at quiet mould insert 22
And the micro-structural die cavity 34 of the homonymy of moving die insert 29 is oppositely arranged to form mold cavity in closure, is opened in described die
There are air cavity 33 in core rod, the one end of air cavity 33 is connected by the runner being opened in die with micro-structural die cavity 34 in described core rod,
The other end of air cavity 33 in the described core rod in dynamic model 8 is arranged on air cavity 32 in the dynamic model being opened in dynamic model 8 to be connected, if
Put the other end of air cavity 33 in the described core rod in quiet mould 10 with air cavity 31 in the quiet mould being opened in quiet mould 10 to be connected, institute
The one end for the quiet mould runner 20 stated and the phase of micro-structural die cavity 34 of the outlet and the other end of sprue bush and quiet mould die 21
The micro-structural die cavity of connection, described one end of dynamic model runner 28 and the outlet of sprue bush and the other end and dynamic model die
34 are connected, and the quiet mould air cavity mouth of air cavity 31 passes through installation respectively in the dynamic model air cavity mouth of air cavity 32 and quiet mould in described dynamic model
The pipeline for having magnetic valve is connected with air pump, and described air pump is connected with the control system of installation dynamic model and the injection machine of quiet mould.
As shown in Fig. 2,3 and 4, air cavity 31 passes through the first magnetic valve 11 installed in quiet mould air cavity mouth 18 and quiet mould gas in described quiet mould
Pump 2 links together, and air cavity 32 passes through the second solenoid valve 7 and dynamic model air pump installed in dynamic model air cavity mouth 25 in described dynamic model
3 link together.
During use can by standard bolt or clamp system by dynamic model 8, quiet mould 10 respectively by with the stationary phase of dynamic model 8
Dynamic model pressing plate 23 even and the quiet moulded board 16 being fixedly linked with quiet mould are fixed on the moving platen 5 and quiet template 12 of injection machine
On, the micro injection molding that whole high aspect ratio microstructures polymer device is completed by the action of injection machine 1 is processed.Injection machine 1
By driving the moving platen 5 of injection machine, under the guide effect of lead 9 and guiding post holes 17, complete dynamic model 8 and quiet mould 10
Matched moulds, and coupling mechanism force can be applied by the locking device 4 of injection machine 1, realize locking.Device such as Fig. 4 is as shown in the figure after matched moulds.
Dynamic model runner is launched into from sprue bush 19 by nozzle 15, molten polymer melt under the driving of the ejecting device 14 of injection machine 1
28 and quiet mould runner 20 composition injection molding channel in, and injection machine 1 ejecting device 14 apply normal pressure and by dynamic model gas
Under the negative pressure effect that pump 3, quiet mould air pump 2 are formed in die cavity, die cavity is flowed into.Second solenoid valve 7, the first magnetic valve 11 are two
Position four-way solenoid valve, realize the airflow direction commutation in respective pipeline.Described dynamic model air pump 3, quiet mould air pump 2 and injection machine 1
Control system link together, dynamic model air pump 3, quiet mould air pump 2 can be controlled according to or not the injection phase of injection machine 1
Cavity pressure is adjusted same injection phase.
In figure 13 be existing injection machine charging basket, 24 be baffle plate, and the structure uses existing structure.
A kind of micro injection molding method based on die cavity air pressure dynamic control, it comprises the following steps:
(1) dynamic model 8, quiet mould 10 is separately fixed on the moving platen 5 of injection machine and the quiet template 12 of injection machine；
(2) using the thick adjustment function of mould of injection machine 1, dynamic model 8 and quiet mould 10 are adjusted to correct die-closed position；
(3) after dynamic model 8 and the matched moulds of quiet mould 10, the nozzle 15 of control injection machine 1 is directed at the sprue bush 19 on quiet mould 10；
(4) ejecting device 14 of synchronous averaging injection machine 1, quiet mould air pump 2 and dynamic model air pump 3, by molten polymer melt
By sprue bush 19, the micro-structural die cavity and dynamic model mould by quiet mould die 21 are injected into via quiet mould runner 20 and dynamic model runner 28
In the mold cavity of the micro-structural die cavity composition of benevolence 26；Simultaneously quiet mould air pump 2 and dynamic model air pump 3 according to the pressure set to mould
It is evacuated in tool die cavity, negative pressure is formed in mold cavity, then pressurize, dwell time and dwell pressure pass through injection machine 1
To set；
(5) after pressurize terminates, quiet mould air pump 2 and dynamic model air pump 3 are closed, the molten polymer cooled down in mold cavity melts
Body.The time of cooling is set according to plastic performance and polymeric material species by injection machine 1.
(6) after completing cooling, start quiet mould air pump 2 and dynamic model air pump 3, to mould type interacvity air-filling, make in mold cavity
Pressure switchs to malleation, and push effect is formed to micro-structural moulding end, and injection machine enters the die sinking stage, by sprue puller 27 and note
The ejecting mechanism 6 of molding machine will be made plastic and remove, and product is completed.
Quiet mould air pump 2 and dynamic model air pump 3 and injection machine form linkage in this method, are acted according to the different phase of injection machine
Pressure in dynamic control die cavity, it is negative pressure in the pressure of injection moulding stage adjustment type intracavitary, promotes the filling of polymer melt
Quality, it is malleation in ejection phase regulation cavity pressure, forms thrust in moulding end face, promote stripping result.
Embodiment 1
Injection molding processing is carried out to microneedle array using apparatus of the present invention and method, microneedle array is 3x3 distribution forms,
Each micropin diameter phi 0.1mm, length 1mm, is comprised the following steps that：
(1) dynamic model 8, quiet mould 10 is separately fixed on the moving platen 5 of injection machine and the quiet template 12 of injection machine；
(2) using the thick adjustment function of mould of injection machine 1, dynamic model 8 and quiet mould 10 are adjusted to correct die-closed position；
(3) after dynamic model 8 and the matched moulds of quiet mould 10, the nozzle 15 of control injection machine 1 is directed at the sprue bush 19 on quiet mould 10；
(4) ejecting device 14 of synchronous averaging injection machine 1, quiet mould air pump 2 and dynamic model air pump 3, melting PMMA melts are led to
Sprue bush 19 is crossed, the micro-structural die cavity and dynamic model die by quiet mould die 21 are injected into via quiet mould runner 20 and dynamic model runner 28
In the mold cavity of 26 micro-structural die cavity composition；Simultaneously quiet mould air pump 2 and dynamic model air pump 3 to being evacuated in mold cavity,
Negative pressure -86KPa is formed in mold cavity, then pressurize 10s, dwell pressure 90MPa；
(5) after pressurize terminates, quiet mould air pump 2 and dynamic model air pump 3 are closed, the molten polymer cooled down in mold cavity melts
Body.Cool down 15s.
(6) after completing cooling, start quiet mould air pump 2 and dynamic model air pump 3, to mould type interacvity air-filling, make in mold cavity
Pressure switchs to malleation, forms push effect to microneedle array moulding end, injection machine enters the die sinking stage, by the He of sprue puller 27
The ejecting mechanism 6 of injection machine will be made plastic and remove, and product is completed.
The micropin length of the microneedle array produced using the inventive method and device reaches complete design length 1mm, realizes
Completely filling out for injection die cavities, and traditional injection moulding method compare, and injection length improves 16%, and in microscope after being stripped
Polymer residue is not found in lower observation mold cavity, moulding does not find micropin phenomenon of rupture.
Claims (2)
1. based on the micro injection molding device of die cavity air pressure dynamic control, it includes dynamic model and quiet mould, described dynamic model and quiet mould
During closure, dynamic model internal face and quiet mould internal face contact with each other to form die joint, the location mid-shaft phase of described dynamic model and quiet mould
Together, the centre of described dynamic model is provided with moving die insert, the centre of described quiet mould is provided with quiet mould insert, described
A guiding post holes is had at the corner of quiet mould, being respectively arranged with the corner of the internal face of described dynamic model can one
One insertion is oriented to the lead of post holes, sprue bush is provided with the centre position of described quiet mould, in the interposition of described dynamic model
Put and be provided with sprue puller hole, sprue puller is inserted with described sprue puller hole, it is characterised in that:It is left in the outlet of described sprue bush
Quiet mould runner is had along the transverse direction of quiet mould insert on the internal face of the quiet mould insert of right both sides, in described moving die insert
Dynamic model runner is laterally had on the internal face of moving die insert at left and right sides of sprue puller hole along moving die insert, it is left in sprue bush
In the quiet mould insert of right both sides along the longitudinal direction of quiet mould insert and the longitudinal direction it is vertical with quiet mould insert and left in sprue puller hole
Along the longitudinal direction of moving die insert and the longitudinal direction is vertical with moving die insert has die chamber on the moving die insert of right both sides,
The described die intracavitary of quiet mould insert is provided with quiet mould die, and the described die intracavitary of moving die insert is provided with dynamic model mould
Benevolence, micro-structural die cavity is provided among the internal face of each die, when dynamic model and quiet mould close, quiet mould runner and dynamic model runner
It is oppositely arranged and is oppositely arranged to form mould in closure positioned at the micro-structural die cavity of quiet mould insert and moving die insert homonymy
Die cavity, is provided with air cavity in core rod in described die, in described core rod air cavity one end by the runner that is opened in die with
Micro-structural die cavity connects, and is arranged on the other end of air cavity in the described core rod in dynamic model and is opened in air cavity in the dynamic model in dynamic model
It is connected, is arranged on the other end of air cavity in the described core rod in quiet mould and is connected with air cavity in the quiet mould in quiet mould is opened in,
Described one end of quiet mould runner is connected with the outlet of sprue bush and the other end with the micro-structural die cavity of quiet mould die,
Described one end of dynamic model runner is connected with the outlet of sprue bush and the other end with the micro-structural die cavity of dynamic model die,
In described dynamic model in the dynamic model air cavity mouth of air cavity and quiet mould the quiet mould air cavity mouth of air cavity respectively by being provided with the pipe of magnetic valve
Road is connected with air pump, and described air pump is connected with the control system of installation dynamic model and the injection machine of quiet mould.
A kind of 2. micro injection molding method of device using claim 1 based on die cavity air pressure dynamic control, it is characterised in that
It comprises the following steps:
(1) dynamic model, quiet mould is separately fixed on the moving platen of injection machine and the quiet template of injection machine；
(2) using the thick adjustment function of mould of injection machine, dynamic model and quiet mould are adjusted to correct die-closed position；
(3) after dynamic model and quiet mould matched moulds, the sprue bush on the quiet mould of nozzle alignment of injection machine is controlled；
(4) ejecting device of synchronous averaging injection machine, quiet mould air pump and dynamic model air pump, pass through cast gate by molten polymer melt
Set, the micro-structural die cavity group of the micro-structural die cavity and dynamic model die by quiet mould die is injected into via quiet mould runner and dynamic model runner
Into mold cavity in；Simultaneously quiet mould air pump and dynamic model air pump according to the pressure set to being evacuated in mold cavity,
Negative pressure, then pressurize are formed in mold cavity；
(5) after pressurize terminates, quiet mould air pump and dynamic model air pump are closed, cools down the molten polymer melt in mold cavity；
(6) after completing cooling, start quiet mould air pump and dynamic model air pump, to mould type interacvity air-filling, turn mould type cavity pressure
For malleation, push effect is formed to micro-structural moulding end, injection machine enters the die sinking stage, by the top of sprue puller and injection machine
Go out mechanism plastic will be made to remove, product is completed.
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| CN107972235A (en) * | 2017-11-29 | 2018-05-01 | 深圳市华益盛模具股份有限公司 | A kind of injection mold and its injection molding forming method |
| CN107891586A (en) * | 2017-12-19 | 2018-04-10 | 武汉湘伟模塑有限公司 | Vacuum low-pressure injection molding system |
| CN109470400B (en) * | 2018-09-21 | 2020-02-14 | 浙江大学 | Method and device for indirectly measuring pressure of injection molding machine cavity by ultrasonic means |
| CN109702959B (en) * | 2018-11-29 | 2021-01-01 | 南京鸿瑞塑料制品有限公司 | Plastic mold based on high-pressure airflow acceleration rate co-resonance |
| CN110789051A (en) * | 2019-11-10 | 2020-02-14 | 缙云县乾恒商贸有限公司 | Bakelite injection molding device with automatic feeding and demolding functions |
| CN112060484A (en) * | 2020-08-21 | 2020-12-11 | 慈溪市精诚模具有限公司 | Forming die for oral cleaning brush head and process thereof |
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| US5879599A (en) * | 1993-12-21 | 1999-03-09 | Bridgestone Sports Co., Ltd. | Method of molding golf balls |
| CN102166812A (en) * | 2011-01-19 | 2011-08-31 | 大连理工大学 | Micro injection mold with pluggable mold core |
| CN102601936A (en) * | 2012-03-01 | 2012-07-25 | 大连理工大学 | Ultrasonic vibration and vacuumizing integrated micro injection mold and molding method |
| CN102873821A (en) * | 2012-09-11 | 2013-01-16 | 大连理工大学 | Micro injection mould for biodegradable vascular stent |
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| JP5006621B2 (en) * | 2006-11-09 | 2012-08-22 | 株式会社日立産機システム | Mold injection mold and mold injection molding method using the same |
| JP5075506B2 (en) * | 2007-07-12 | 2012-11-21 | 日本ポリプロ株式会社 | Manufacturing method of foam molded article |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| US5879599A (en) * | 1993-12-21 | 1999-03-09 | Bridgestone Sports Co., Ltd. | Method of molding golf balls |
| CN102166812A (en) * | 2011-01-19 | 2011-08-31 | 大连理工大学 | Micro injection mold with pluggable mold core |
| CN102601936A (en) * | 2012-03-01 | 2012-07-25 | 大连理工大学 | Ultrasonic vibration and vacuumizing integrated micro injection mold and molding method |
| CN102873821A (en) * | 2012-09-11 | 2013-01-16 | 大连理工大学 | Micro injection mould for biodegradable vascular stent |
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