CN107116752A - A kind of multiple spot nitrogen charging plastic mould Shooting Technique - Google Patents
A kind of multiple spot nitrogen charging plastic mould Shooting Technique Download PDFInfo
- Publication number
- CN107116752A CN107116752A CN201710547517.6A CN201710547517A CN107116752A CN 107116752 A CN107116752 A CN 107116752A CN 201710547517 A CN201710547517 A CN 201710547517A CN 107116752 A CN107116752 A CN 107116752A
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- die cavity
- nitrogen charging
- nitrogen
- flow channel
- mould
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- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 title claims abstract description 193
- 229910052757 nitrogen Inorganic materials 0.000 title claims abstract description 95
- 229920003023 plastic Polymers 0.000 title claims abstract description 67
- 239000004033 plastic Substances 0.000 title claims abstract description 67
- 238000000034 method Methods 0.000 title claims abstract description 17
- 238000002347 injection Methods 0.000 claims abstract description 50
- 239000007924 injection Substances 0.000 claims abstract description 50
- 238000001816 cooling Methods 0.000 claims abstract description 26
- 239000007789 gas Substances 0.000 claims abstract description 25
- 238000013461 design Methods 0.000 claims abstract description 11
- 239000002826 coolant Substances 0.000 claims description 40
- 239000011261 inert gas Substances 0.000 claims description 13
- 239000012943 hotmelt Substances 0.000 claims description 10
- 230000008676 import Effects 0.000 claims description 10
- 230000000694 effects Effects 0.000 claims description 8
- 230000015572 biosynthetic process Effects 0.000 claims description 6
- 238000000465 moulding Methods 0.000 claims description 6
- 239000000284 extract Substances 0.000 claims description 5
- 230000001788 irregular Effects 0.000 claims description 5
- 239000000463 material Substances 0.000 claims description 5
- 238000007711 solidification Methods 0.000 claims description 5
- 230000008023 solidification Effects 0.000 claims description 5
- 235000009967 Erodium cicutarium Nutrition 0.000 claims description 4
- 240000003759 Erodium cicutarium Species 0.000 claims description 4
- 238000005728 strengthening Methods 0.000 claims description 2
- 238000001746 injection moulding Methods 0.000 abstract description 4
- 238000004519 manufacturing process Methods 0.000 abstract description 2
- 239000002932 luster Substances 0.000 description 4
- 238000010137 moulding (plastic) Methods 0.000 description 4
- 238000012797 qualification Methods 0.000 description 4
- 229910001873 dinitrogen Inorganic materials 0.000 description 3
- 230000003014 reinforcing effect Effects 0.000 description 3
- 230000007812 deficiency Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
- 238000003672 processing method Methods 0.000 description 2
- 241000894007 species Species 0.000 description 2
- 239000000758 substrate Substances 0.000 description 2
- 241000921636 Ranunculus aquatilis Species 0.000 description 1
- 230000000712 assembly Effects 0.000 description 1
- 238000000429 assembly Methods 0.000 description 1
- 238000007664 blowing Methods 0.000 description 1
- 238000000748 compression moulding Methods 0.000 description 1
- 230000008602 contraction Effects 0.000 description 1
- 229920006351 engineering plastic Polymers 0.000 description 1
- 230000002708 enhancing effect Effects 0.000 description 1
- 238000001125 extrusion Methods 0.000 description 1
- 208000020442 loss of weight Diseases 0.000 description 1
- 239000011159 matrix material Substances 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
Classifications
-
- 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
- B29C45/1703—Introducing an auxiliary fluid into the mould
- B29C45/1704—Introducing an auxiliary fluid into the mould the fluid being introduced into the interior of the injected material which is still in a molten state, e.g. for producing hollow articles
- B29C45/1706—Introducing an auxiliary fluid into the mould the fluid being introduced into the interior of the injected material which is still in a molten state, e.g. for producing hollow articles using particular fluids or fluid generating substances
-
- 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
- B29C45/27—Sprue channels ; Runner channels or runner nozzles
- B29C45/2756—Cold runner channels
-
- 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
- B29C45/1703—Introducing an auxiliary fluid into the mould
- B29C45/1704—Introducing an auxiliary fluid into the mould the fluid being introduced into the interior of the injected material which is still in a molten state, e.g. for producing hollow articles
- B29C45/1706—Introducing an auxiliary fluid into the mould the fluid being introduced into the interior of the injected material which is still in a molten state, e.g. for producing hollow articles using particular fluids or fluid generating substances
- B29C2045/1709—Introducing an auxiliary fluid into the mould the fluid being introduced into the interior of the injected material which is still in a molten state, e.g. for producing hollow articles using particular fluids or fluid generating substances using a cooling fluid
-
- 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
- B29C45/1703—Introducing an auxiliary fluid into the mould
- B29C45/1704—Introducing an auxiliary fluid into the mould the fluid being introduced into the interior of the injected material which is still in a molten state, e.g. for producing hollow articles
- B29C2045/173—Introducing an auxiliary fluid into the mould the fluid being introduced into the interior of the injected material which is still in a molten state, e.g. for producing hollow articles using a plurality of fluid injection nozzles
Abstract
The invention discloses a kind of multiple spot nitrogen charging plastic mould Shooting Technique, comprise the following steps：Step（1）Design of Plastic Mould；Step（2）The mould precooling stage；Step（3）Melt injection stage；Step（4）Mould gas-assisted system stages；Step（5）Cooling stage and local cooling stage；Step（6）Gas incidence ending phase；Step（7）The gas pumpback stage.This invention removes the internal stress existed inside injection molding product so that the quality of injection molding product is high, greatly improves the production efficiency and yield rate of mould.
Description
Technical field
The present invention relates to a kind of multiple spot nitrogen charging plastic mould Shooting Technique, belong to mold injection technical field.
Background technology
Plastic mould, is in plastics processing industry and plastic molding press is supporting, assigns plastic products with complete configuration and essence
The instrument of true size.Because plastics variety and processing method are various, the structure of plastic molding press and plastic products is again complicated and simple to differ,
So the species and structure of plastic mould are also diversified.One kind be used for compression moulding, extrusion molding, injection, blowing and low ratio foamed into
The built-up plastics mould of type, it mainly includes by having that die set substrate, cavity plate component and die set clamp are constituted
The cavity plate of variable impression, combines clamp, die cavity by punch-pin assembled substrate, punch assemblies, punch-pin and blocks component and side section compoboard
The punch-pin with variable core of composition.Mould punch and matrix and assistant formation system coordination change, can process different shape,
Various sizes of serial plastic.It is supporting with plastic molding press in plastics processing industry, plastic products are assigned with complete configuration and essence
The instrument of true size.Because plastics variety and processing method are various, the structure of plastic molding press and plastic products is again complicated and simple to differ,
So the species and structure of plastic mould are also diversified.With developing rapidly and general and engineering plastics for plastics industry
Continuous improvement in terms of intensity, the application of plastic products is also constantly expanding, the consumption of plastic product also on
Rise.
Injection-molded item is inseparable in people's production and living, and this relation between supply and demand also promotes the swift and violent hair of note injection industry
Exhibition, has the rarity of following oil in mind, control cost is that businessman must strive problem.Because injection-molded item is adopted extensively by industry-by-industry
With the requirement to plastic precision is also into problem in the industry.Traditional injection is will to dissolve body to pass through mechanical energy high-pressure injection
It is molded in die cavity, but in injection, pressurize is cooled down, and the internal stress and plastic wall thickness produced in contraction process, which is shunk, to differ, and makes modeling
Part deforms warped, influences precision of plastic, especially for the plasthetics of the complicated became uneven of moulding, and yield rate is very low, simultaneously
Easily there is fold in the products appearance of output, and surface color is not full.In addition with the extensive use of injection-molded item, pass through injection
The setting of product intermediate hollow has been increasingly becoming one come the slight and intensity to injection-molded item loss of weight and enhancing injection-molded item
Important research topic.For this reason, it may be necessary to design a kind of new injection molding process technology, above-mentioned existing skill comprehensive can be overcome
The deficiency that art is present.
The content of the invention
The present invention is exactly in view of the deficienciess of the prior art, provide a kind of multiple spot nitrogen charging plastic mould Shooting Technique, energy
Enough overcome the shortcomings of that prior art is present, meet actual operation requirements.
To solve the above problems, the technical solution used in the present invention is as follows：
A kind of multiple spot nitrogen charging plastic mould Shooting Technique, comprises the following steps：
Step（1）Design of Plastic Mould：
The plastic mould includes being provided with die cavity, the plastic mould sheet in plastic mould body, the plastic mould body
It is provided with body in the coolant flow channel for coordinating the die cavity to use, the coolant flow channel and is arranged with inflated with nitrogen road；
Local cooling module is provided between the coolant flow channel and the die cavity, is set between the nitrogen charging air flue and the die cavity
Changeover joint is equipped with, multiple spot nitrogen charging interface, and the multiple spot nitrogen charging interface and the mistake are additionally provided with around the die cavity surrounding
Cross between interface and be provided with the connecting tube being connected；
It is provided with the coolant flow channel on the first import used cooperatively, the nitrogen charging air flue and is provided with second used cooperatively
Import；
Step（2）The mould precooling stage：
Cold airflow will be dried to be passed through in the coolant flow channel, precooling effect is carried out to plastic mold cavity inwall, pre-coo time is
6-12s, then will dry cold airflow by air exhauster again and extract out；
Step（3）Melt injection stage：
Under mould matched moulds state, hot melt is expelled in die cavity from mould gate, hot melt runs into the relatively low die cavity of temperature
Die wall, a relatively thin solidification layer can be formed through 3-5s；
Step（4）Mould gas-assisted system stages：
In step（3）After postpone 2-4s, when filling melt die cavity 75%-95% volumes, the auxiliary system of opening mold gas is by pure inertia
Gas nitrogen is filled with nitrogen charging air flue, it is ensured that injection is filled with the nitrogen of sufficient amount before not completing, and promotes die cavity center not solidified
Melt enters the mold cavity being not yet full of, wherein, a small amount of pure inert gas nitrogen formation air flue is filled with by multiple spot nitrogen charging interface
To die cavity privileged sites, privileged sites filling melt dynamics and melt forming quality in die cavity are improved；
Step（5）Cooling stage and local cooling stage：
Treat step（4）After the completion of postpone 4-8s, cold airflow is expelled in the coolant flow channel, coolant flow channel accelerate die cavity in melt
Body formed speed and Forming Quality is improved, wherein, it is cold that Local cooling module carries out local strengthening to the privileged sites in die cavity
But, the Forming Quality of melt privileged sites is improved；
Step（6）Gas incidence ending phase：
Pure inert gas nitrogen is continued into slow incide ensures locally to contract caused by the factors such as Material shrinkage in nitrogen charging air flue
Water crowfoot cracks, it is ensured that the outward appearance and precision of moulding；
Step（7）The gas pumpback stage：
When the pressure of nitrogen charging air flue is under equal state with cavity pressure, the nitrogen in nitrogen charging air flue starts pumpback, it is ensured that pressure
Power and time control are proper, it is ensured that the quality of Injection moulded part.
Wherein, the coolant flow channel is irregular structure.
Compared with prior art, implementation result of the invention is as follows by the present invention：
A kind of multiple spot nitrogen charging plastic mould Shooting Technique of the present invention, by the design in plastic mould structure and changing
Enter, with reference to multiple spot nitrogen charging（Acted on raising filling dynamics is carried out to privileged sites in die cavity with Forming Quality is improved）And cold flow
The operation principle in road make it that the quality of mold injection molding product is high, eliminates the internal stress existed inside Injection moulded part, eliminates
The fold and color and luster that Injection moulded part surface is present be not full, greatly improves the qualification rate of Injection moulded part, it is to avoid injection system
The shrink phenomenon on part surface；Meanwhile, improve the finish on Injection moulded part surface so that Injection moulded part quality is more perfect.
Brief description of the drawings
Fig. 1 is multiple spot nitrogen charging plastic mould structural representation of the present invention.
Embodiment
Illustrate present disclosure below in conjunction with specific embodiments.
Specific embodiment 1
As shown in figure 1, being a kind of multiple spot nitrogen charging plastic mould Shooting Technique described in the present embodiment, comprise the following steps：
Step（1）Design of Plastic Mould：
The plastic mould includes being provided with die cavity 20, the plastics in plastic mould body 10, the plastic mould body 10
It is provided with die ontology 10 in the coolant flow channel 30 for coordinating die cavity 20 to use, the coolant flow channel 30 and is arranged with inflated with nitrogen road
40；
Local cooling module 50, the nitrogen charging air flue 40 and die cavity 20 are provided between the coolant flow channel 30 and the die cavity 20
Between be provided with changeover joint 42, be additionally provided with multiple spot nitrogen charging interface 21 around the surrounding of die cavity 20, and multiple spot nitrogen charging interface 21 with
The connecting tube 60 being connected is provided between changeover joint 42；
It is provided with to be provided with the first import 31 used cooperatively, the nitrogen charging air flue 40 on the coolant flow channel 30 and uses cooperatively
The second import 41；
Step（2）The mould precooling stage：
Cold airflow will be dried to be passed through in the coolant flow channel 30, precooling effect is carried out to the inwall of plastic mold cavity 20, during precooling
Between be 6s, then again by air exhauster will dry cold airflow extract out；
Step（3）Melt injection stage：
Under mould matched moulds state, hot melt is expelled in die cavity from mould gate, hot melt runs into the relatively low die cavity of temperature
Die wall, a relatively thin solidification layer can be formed through 3s；
Step（4）Mould gas-assisted system stages：
In step（3）After postpone 2s, when filling melt 75% volume of die cavity, the auxiliary system of opening mold gas is by pure inert gas nitrogen
Gas is filled with nitrogen charging air flue 40, it is ensured that injection is filled with the nitrogen of sufficient amount before not completing, and promotes the center of die cavity 20 not solidified molten
Body enters the mold cavity 20 being not yet full of, wherein, multiple spot nitrogen charging interface 21 fills a small amount of pure inert gas nitrogen formation air flue
Enter to the privileged sites of die cavity 20, improve privileged sites filling melt dynamics and melt forming quality in die cavity 20；
Step（5）Cooling stage and local cooling stage：
Treat step（4）After the completion of postpone 4s, cold airflow is expelled in the coolant flow channel 30, coolant flow channel 30 accelerate die cavity 20
Interior melt forming speed and Forming Quality is improved, wherein, Local cooling module 50 is to the privileged sites progress office in die cavity 20
Portion's reinforcing cooling, improves the Forming Quality of melt privileged sites；
Step（6）Gas incidence ending phase：
Pure inert gas nitrogen is continued into slow incide ensures the part caused by the factors such as Material shrinkage in nitrogen charging air flue 40
Shrink crowfoot cracks, it is ensured that the outward appearance and precision of moulding；
Step（7）The gas pumpback stage：
When the pressure of nitrogen charging air flue 40 is under equal state with the pressure of die cavity 20, the nitrogen in nitrogen charging air flue 40 starts pumpback,
Ensure that pressure and time control are proper, it is ensured that the quality of Injection moulded part.
Specifically, the present invention is by the design and improvement in plastic mould structure, with reference to multiple spot nitrogen charging（With to die cavity
Interior privileged sites carry out improving filling dynamics and improve Forming Quality effect）And the operation principle of cold runner cause mold injection into
The quality of type product is high, eliminates the internal stress existed inside Injection moulded part, eliminate the presence of Injection moulded part surface fold and
Color and luster is not full, greatly improves the qualification rate of Injection moulded part, it is to avoid the shrink phenomenon on Injection moulded part surface；Meanwhile, improve
The finish on Injection moulded part surface so that Injection moulded part quality is more perfect.
Note 1：Step（1）Described in coolant flow channel 30 be irregular structure.
Note 2：The purpose postponed described in technique of the present invention is to ensure that nitrogen is fully filled into nitrogen charging air flue.
Specific embodiment 2
As shown in figure 1, being a kind of multiple spot nitrogen charging plastic mould Shooting Technique described in the present embodiment, comprise the following steps：
Step（1）Design of Plastic Mould：
The plastic mould includes being provided with die cavity 20, the plastics in plastic mould body 10, the plastic mould body 10
It is provided with die ontology 10 in the coolant flow channel 30 for coordinating die cavity 20 to use, the coolant flow channel 30 and is arranged with inflated with nitrogen road
40；
Local cooling module 50, the nitrogen charging air flue 40 and die cavity 20 are provided between the coolant flow channel 30 and the die cavity 20
Between be provided with changeover joint 42, be additionally provided with multiple spot nitrogen charging interface 21 around the surrounding of die cavity 20, and multiple spot nitrogen charging interface 21 with
The connecting tube 60 being connected is provided between changeover joint 42；
It is provided with to be provided with the first import 31 used cooperatively, the nitrogen charging air flue 40 on the coolant flow channel 30 and uses cooperatively
The second import 41；
Step（2）The mould precooling stage：
Cold airflow will be dried to be passed through in the coolant flow channel 30, precooling effect is carried out to the inwall of plastic mold cavity 20, during precooling
Between be 9s, then again by air exhauster will dry cold airflow extract out；
Step（3）Melt injection stage：
Under mould matched moulds state, hot melt is expelled in die cavity from mould gate, hot melt runs into the relatively low die cavity of temperature
Die wall, a relatively thin solidification layer can be formed through 4s；
Step（4）Mould gas-assisted system stages：
In step（3）After postpone 3s, when filling melt 85% volume of die cavity, the auxiliary system of opening mold gas is by pure inert gas nitrogen
Gas is filled with nitrogen charging air flue 40, it is ensured that injection is filled with the nitrogen of sufficient amount before not completing, and promotes the center of die cavity 20 not solidified molten
Body enters the mold cavity 20 being not yet full of, wherein, multiple spot nitrogen charging interface 21 fills a small amount of pure inert gas nitrogen formation air flue
Enter to the privileged sites of die cavity 20, improve privileged sites filling melt dynamics and melt forming quality in die cavity 20；
Step（5）Cooling stage and local cooling stage：
Treat step（4）After the completion of postpone 6s, cold airflow is expelled in the coolant flow channel 30, coolant flow channel 30 accelerate die cavity 20
Interior melt forming speed and Forming Quality is improved, wherein, Local cooling module 50 is to the privileged sites progress office in die cavity 20
Portion's reinforcing cooling, improves the Forming Quality of melt privileged sites；
Step（6）Gas incidence ending phase：
Pure inert gas nitrogen is continued into slow incide ensures the part caused by the factors such as Material shrinkage in nitrogen charging air flue 40
Shrink crowfoot cracks, it is ensured that the outward appearance and precision of moulding；
Step（7）The gas pumpback stage：
When the pressure of nitrogen charging air flue 40 is under equal state with the pressure of die cavity 20, the nitrogen in nitrogen charging air flue 40 starts pumpback,
Ensure that pressure and time control are proper, it is ensured that the quality of Injection moulded part.
Specifically, the present invention is by the design and improvement in plastic mould structure, with reference to multiple spot nitrogen charging（With to die cavity
Interior privileged sites carry out improving filling dynamics and improve Forming Quality effect）And the operation principle of cold runner cause mold injection into
The quality of type product is high, eliminates the internal stress existed inside Injection moulded part, eliminate the presence of Injection moulded part surface fold and
Color and luster is not full, greatly improves the qualification rate of Injection moulded part, it is to avoid the shrink phenomenon on Injection moulded part surface；Meanwhile, improve
The finish on Injection moulded part surface so that Injection moulded part quality is more perfect.
Note 1：Step（1）Described in coolant flow channel 30 be irregular structure.
Note 2：The purpose postponed described in technique of the present invention is to ensure that nitrogen is fully filled into nitrogen charging air flue.
Specific embodiment 3
As shown in figure 1, being a kind of multiple spot nitrogen charging plastic mould Shooting Technique described in the present embodiment, comprise the following steps：
Step（1）Design of Plastic Mould：
The plastic mould includes being provided with die cavity 20, the plastics in plastic mould body 10, the plastic mould body 10
It is provided with die ontology 10 in the coolant flow channel 30 for coordinating die cavity 20 to use, the coolant flow channel 30 and is arranged with inflated with nitrogen road
40；
Local cooling module 50, the nitrogen charging air flue 40 and die cavity 20 are provided between the coolant flow channel 30 and the die cavity 20
Between be provided with changeover joint 42, be additionally provided with multiple spot nitrogen charging interface 21 around the surrounding of die cavity 20, and multiple spot nitrogen charging interface 21 with
The connecting tube 60 being connected is provided between changeover joint 42；
It is provided with to be provided with the first import 31 used cooperatively, the nitrogen charging air flue 40 on the coolant flow channel 30 and uses cooperatively
The second import 41；
Step（2）The mould precooling stage：
Cold airflow will be dried to be passed through in the coolant flow channel 30, precooling effect is carried out to the inwall of plastic mold cavity 20, during precooling
Between be 12s, then again by air exhauster will dry cold airflow extract out；
Step（3）Melt injection stage：
Under mould matched moulds state, hot melt is expelled in die cavity from mould gate, hot melt runs into the relatively low die cavity of temperature
Die wall, a relatively thin solidification layer can be formed through 5s；
Step（4）Mould gas-assisted system stages：
In step（3）After postpone 4s, when filling melt 95% volume of die cavity, the auxiliary system of opening mold gas is by pure inert gas nitrogen
Gas is filled with nitrogen charging air flue 40, it is ensured that injection is filled with the nitrogen of sufficient amount before not completing, and promotes the center of die cavity 20 not solidified molten
Body enters the mold cavity 20 being not yet full of, wherein, multiple spot nitrogen charging interface 21 fills a small amount of pure inert gas nitrogen formation air flue
Enter to the privileged sites of die cavity 20, improve privileged sites filling melt dynamics and melt forming quality in die cavity 20；
Step（5）Cooling stage and local cooling stage：
Treat step（4）After the completion of postpone 8s, cold airflow is expelled in the coolant flow channel 30, coolant flow channel 30 accelerate die cavity 20
Interior melt forming speed and Forming Quality is improved, wherein, Local cooling module 50 is to the privileged sites progress office in die cavity 20
Portion's reinforcing cooling, improves the Forming Quality of melt privileged sites；
Step（6）Gas incidence ending phase：
Pure inert gas nitrogen is continued into slow incide ensures the part caused by the factors such as Material shrinkage in nitrogen charging air flue 40
Shrink crowfoot cracks, it is ensured that the outward appearance and precision of moulding；
Step（7）The gas pumpback stage：
When the pressure of nitrogen charging air flue 40 is under equal state with the pressure of die cavity 20, the nitrogen in nitrogen charging air flue 40 starts pumpback,
Ensure that pressure and time control are proper, it is ensured that the quality of Injection moulded part.
Specifically, the present invention is by the design and improvement in plastic mould structure, with reference to multiple spot nitrogen charging（With to die cavity
Interior privileged sites carry out improving filling dynamics and improve Forming Quality effect）And the operation principle of cold runner cause mold injection into
The quality of type product is high, eliminates the internal stress existed inside Injection moulded part, eliminate the presence of Injection moulded part surface fold and
Color and luster is not full, greatly improves the qualification rate of Injection moulded part, it is to avoid the shrink phenomenon on Injection moulded part surface；Meanwhile, improve
The finish on Injection moulded part surface so that Injection moulded part quality is more perfect.
Note 1：Step（1）Described in coolant flow channel 30 be irregular structure.
Note 2：The purpose postponed described in technique of the present invention is to ensure that nitrogen is fully filled into nitrogen charging air flue.
Above content is made for the present invention in conjunction with specific embodiments describes in detail, it is impossible to assert that the present invention is specific real
Apply and be only limitted to these explanations.For those skilled in the art, before present inventive concept is not departed from
Put, some simple deduction or replace can also be made, the scope of protection of the invention should be all considered as belonging to.
Claims (2)
1. a kind of multiple spot nitrogen charging plastic mould Shooting Technique, it is characterised in that：Comprise the following steps：
Step（1）Design of Plastic Mould：
The plastic mould includes plastic mould body（10）, the plastic mould body（10）Inside it is provided with die cavity（20）, institute
State plastic mould body（10）On be provided with the cooperation die cavity（20）The coolant flow channel used（30）, the coolant flow channel（30）
Inside it is arranged with inflated with nitrogen road（40）；
The coolant flow channel（30）With the die cavity（20）Between be provided with Local cooling module（50）, the nitrogen charging air flue（40）
With the die cavity（20）Between be provided with changeover joint（42）, around the die cavity（20）Surrounding is additionally provided with multiple spot nitrogen charging interface
（21）, and the multiple spot nitrogen charging interface（21）With the changeover joint（42）Between be provided with the connecting tube being connected（60）；
The coolant flow channel（30）On be provided with the first import used cooperatively（31）, the nitrogen charging air flue（40）On be provided with and match somebody with somebody
Close the second import used（41）；
Step（2）The mould precooling stage：
Cold airflow will be dried and be passed through the coolant flow channel（30）It is interior, to plastic mold cavity（20）Inwall carries out precooling effect, in advance
Cool time is 6-12s, and then will dry cold airflow by air exhauster again extracts out；
Step（3）Melt injection stage：
Under mould matched moulds state, hot melt is expelled in die cavity from mould gate, hot melt runs into the relatively low die cavity of temperature
Die wall, a relatively thin solidification layer can be formed through 3-5s；
Step（4）Mould gas-assisted system stages：
In step（3）After postpone 2-4s, when filling melt die cavity 75%-95% volumes, the auxiliary system of opening mold gas is by pure inertia
Gas nitrogen is filled with nitrogen charging air flue（40）It is interior, it is ensured that injection is filled with the nitrogen of sufficient amount before not completing, promote die cavity（20）Center
Not solidified melt enters the mold cavity being not yet full of（20）, wherein, multiple spot nitrogen charging interface（21）By a small amount of pure inert gas
Nitrogen formation air flue is filled into die cavity（20）Privileged sites, improve die cavity（20）Interior privileged sites filling melt dynamics and melt into
Type quality；
Step（5）Cooling stage and local cooling stage：
Treat step（4）After the completion of postpone 4-8s, cold airflow is expelled to the coolant flow channel（30）It is interior, coolant flow channel（30）Accelerate
Die cavity（20）Interior melt forming speed and Forming Quality is improved, wherein, Local cooling module（50）To die cavity（20）Interior spy
Different position carries out local strengthening cooling, improves the Forming Quality of melt privileged sites；
Step（6）Gas incidence ending phase：
Pure inert gas nitrogen is continued slowly to incide nitrogen charging air flue（40）Inside ensure the office caused by the factors such as Material shrinkage
Portion's shrink crowfoot cracks, it is ensured that the outward appearance and precision of moulding；
Step（7）The gas pumpback stage：
When nitrogen charging air flue（40）Pressure and die cavity（20）Pressure is under equal state, nitrogen charging air flue（40）Interior nitrogen starts
Pumpback, it is ensured that pressure and time control are proper, it is ensured that the quality of Injection moulded part.
2. a kind of multiple spot nitrogen charging plastic mould Shooting Technique according to claim 1, it is characterised in that：Step（1）Described in
Coolant flow channel（30）For irregular structure.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710547517.6A CN107116752A (en) | 2017-07-06 | 2017-07-06 | A kind of multiple spot nitrogen charging plastic mould Shooting Technique |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108582825A (en) * | 2018-04-08 | 2018-09-28 | 深圳市比亚迪电子部品件有限公司 | A kind of LED headlamp hollow lens product and preparation method thereof |
| CN109435162A (en) * | 2018-12-29 | 2019-03-08 | 盐城工学院 | A kind of automobile injection mold with outer cooling system |
| CN109435163A (en) * | 2018-12-29 | 2019-03-08 | 盐城工学院 | A kind of auto parts injection moulding process and injection mold |
| CN110834404A (en) * | 2018-08-16 | 2020-02-25 | 台山市世隆塑料有限公司 | Injection mold |
-
2017
- 2017-07-06 CN CN201710547517.6A patent/CN107116752A/en not_active Withdrawn
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108582825A (en) * | 2018-04-08 | 2018-09-28 | 深圳市比亚迪电子部品件有限公司 | A kind of LED headlamp hollow lens product and preparation method thereof |
| CN110834404A (en) * | 2018-08-16 | 2020-02-25 | 台山市世隆塑料有限公司 | Injection mold |
| CN109435162A (en) * | 2018-12-29 | 2019-03-08 | 盐城工学院 | A kind of automobile injection mold with outer cooling system |
| CN109435163A (en) * | 2018-12-29 | 2019-03-08 | 盐城工学院 | A kind of auto parts injection moulding process and injection mold |
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