CN106738667A - For the spraying-free high-surface gloss traceless injection molding process of LED television fore shell - Google Patents
For the spraying-free high-surface gloss traceless injection molding process of LED television fore shell Download PDFInfo
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- CN106738667A CN106738667A CN201611056714.XA CN201611056714A CN106738667A CN 106738667 A CN106738667 A CN 106738667A CN 201611056714 A CN201611056714 A CN 201611056714A CN 106738667 A CN106738667 A CN 106738667A
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- fore shell
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- 238000001746 injection moulding Methods 0.000 title claims abstract description 27
- 238000002347 injection Methods 0.000 claims abstract description 107
- 239000007924 injection Substances 0.000 claims abstract description 107
- 239000004033 plastic Substances 0.000 claims abstract description 30
- 229920003023 plastic Polymers 0.000 claims abstract description 30
- 238000001816 cooling Methods 0.000 claims abstract description 25
- 238000001035 drying Methods 0.000 claims abstract description 11
- 238000010438 heat treatment Methods 0.000 claims abstract description 10
- 230000001052 transient effect Effects 0.000 claims abstract description 6
- 239000000463 material Substances 0.000 claims description 20
- 238000000034 method Methods 0.000 claims description 13
- 239000000835 fiber Substances 0.000 claims description 10
- 229920007019 PC/ABS Polymers 0.000 claims description 5
- 229910000831 Steel Inorganic materials 0.000 claims description 5
- 238000007664 blowing Methods 0.000 claims description 5
- 230000006835 compression Effects 0.000 claims description 5
- 238000007906 compression Methods 0.000 claims description 5
- 239000012535 impurity Substances 0.000 claims description 5
- 238000009413 insulation Methods 0.000 claims description 5
- 230000035772 mutation Effects 0.000 claims description 5
- 229920003229 poly(methyl methacrylate) Polymers 0.000 claims description 5
- 239000004926 polymethyl methacrylate Substances 0.000 claims description 5
- 239000010959 steel Substances 0.000 claims description 5
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 5
- 238000004140 cleaning Methods 0.000 claims description 2
- 239000012530 fluid Substances 0.000 claims 1
- 238000012797 qualification Methods 0.000 abstract description 7
- 238000007493 shaping process Methods 0.000 abstract description 7
- 238000005507 spraying Methods 0.000 description 10
- 230000007613 environmental effect Effects 0.000 description 5
- 230000006698 induction Effects 0.000 description 4
- UHOVQNZJYSORNB-UHFFFAOYSA-N Benzene Chemical compound C1=CC=CC=C1 UHOVQNZJYSORNB-UHFFFAOYSA-N 0.000 description 3
- 238000000576 coating method Methods 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 230000000149 penetrating effect Effects 0.000 description 3
- 238000000465 moulding Methods 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 208000028571 Occupational disease Diseases 0.000 description 1
- 230000001154 acute effect Effects 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- 239000012752 auxiliary agent Substances 0.000 description 1
- 230000001684 chronic effect Effects 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 239000002360 explosive Substances 0.000 description 1
- 239000000383 hazardous chemical Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000003973 paint Substances 0.000 description 1
- 231100000572 poisoning Toxicity 0.000 description 1
- 230000000607 poisoning effect Effects 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 239000002904 solvent Substances 0.000 description 1
- 239000003039 volatile agent 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
- B29C45/0025—Preventing defects on the moulded article, e.g. weld lines, shrinkage marks
-
- 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
-
- 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
- B29C45/2701—Details not specific to hot or cold runner channels
- B29C45/2708—Gates
-
- 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
- B29C45/72—Heating or cooling
- B29C45/73—Heating or cooling of the mould
- B29C45/7337—Heating or cooling of the mould using gas or steam
-
- 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
- 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
- B29C45/77—Measuring, controlling or regulating of velocity or pressure of 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
- B29C45/78—Measuring, controlling or regulating of temperature
-
- 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
- B29C2045/0096—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor drying the moulding material before injection, e.g. by heating
-
- 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
-
- 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
- B29C2945/76531—Temperature
-
- 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
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
- B29K2033/00—Use of polymers of unsaturated acids or derivatives thereof as moulding material
- B29K2033/04—Polymers of esters
- B29K2033/12—Polymers of methacrylic acid esters, e.g. PMMA, i.e. polymethylmethacrylate
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
- B29K2055/00—Use of specific polymers obtained by polymerisation reactions only involving carbon-to-carbon unsaturated bonds, not provided for in a single one of main groups B29K2023/00 - B29K2049/00, e.g. having a vinyl group, as moulding material
- B29K2055/02—ABS polymers, i.e. acrylonitrile-butadiene-styrene polymers
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
- B29K2069/00—Use of PC, i.e. polycarbonates or derivatives thereof, as moulding material
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
- B29L2031/00—Other particular articles
- B29L2031/34—Electrical apparatus, e.g. sparking plugs or parts thereof
- B29L2031/3475—Displays, monitors, TV-sets, computer screens
Landscapes
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Mechanical Engineering (AREA)
- Injection Moulding Of Plastics Or The Like (AREA)
- Moulds For Moulding Plastics Or The Like (AREA)
Abstract
The invention discloses a kind of spraying-free high-surface gloss traceless injection molding process for LED television fore shell, comprise the following steps:Step（1）, mold design；Step（2）, sorting；Step（3）, drying；Step（4）, mould preheating：Mould is correctly installed on injection machine, mould is preheated before matched moulds is produced, preheating temperature is set to 80 90 DEG C；Step（5）, matched moulds, transient heating；Step（6）, three-level injection；Step（7）, quick cooling；Step（8）, die sinking pickup.The present invention is designed using hot flow path and cold runner multiple feed sub-marine gate, plastic melt is solved to there are problems that, the structure of corresponding hot flow path and cold runner is improved in the crucial portion of product simultaneously, and then product appearance quality, shaping qualification rate etc. are greatly improved, meet actual operation requirements.
Description
Technical field
The present invention relates to a kind of spraying-free high-surface gloss traceless injection molding process for LED television fore shell, belong to auxiliary
Formula steam high-light no-trace technical field of injection molding.
Background technology
With continuing to develop for science and technology, the continuous improvement of people's living standard, the feature to television set will
Ask and appearance requirement more and more higher, such as the surface smoothness and accuracy of television cabin.In order to improve the surface matter of injecting products
Amount, would generally use spraying coating process in existing technology.Spraying be employed in surface protection it is most basic, most extensively, most
Effective means.Spraying ensure that television cabin surface has anti-corrosion function, outward appearance beautiful, and coating quality is directly connected to product
The competitiveness of product and the market development.But while attractive in appearance, durable products are provided, spraying coating process is because using a large amount of volatiles
The hazardous chemicals such as solvent, auxiliary agent, paint vehicle, environmental pollution is larger, these chemicals and be inflammable explosive article exist it is larger
Potential safety hazard, while these chemicals easily bring occupational disease to operator, such as acute and chronic benzene poisoning.
At present, people have been no longer satisfied with the multicoloured fashion appearance of various products, to the appreciation of its outward appearance taste and
The requirement of environmental protection also more and more higher.Then spraying-free high-surface gloss traceless Shooting Technique becomes the new focus of people, exempts from spraying
High-surface gloss traceless injection molding is mainly and mould is quickly cooled down in plastic injection molding process, quickly heats to realize, this
The heating and cooling for planting injection forming mold are carried out by setting hot cold medium passage in a mold, and then can be reached
Its appearance requirement and performance requirement, but the heating of mould and cooling are by water channel that the die cavity and core of whole mould is fast
Speed heating and cool down, and plastics in a mold punch die distance it is more long, the speed of cooling and solidifying is simultaneously non-uniform, plastic products each
The inhomogeneities of heating and cooling of the point in die cavity can cause plastic member product to produce internal stress and have a strong impact on outside product
Problem of appearance quality etc..These can all cause production efficiency to decline, and shaping qualification rate is low, and process costs are high, influence market
The adverse consequences such as delivery time.For this reason, it may be necessary to improve spraying-free high-surface gloss traceless injection molding, comprehensive prior art can be overcome
Present in it is not enough.
The content of the invention
The present invention is exactly in view of the shortcomings of the prior art, there is provided a kind of to exempt from spraying height for LED television fore shell
Light non-trace injection molding technique, is designed using hot flow path and cold runner multiple feed sub-marine gate, is solved plastic melt and is deposited
The problems such as internal stress, while improving the structure of corresponding hot flow path and cold runner in the crucial portion of product, and then greatly improve
Product appearance quality, shaping qualification rate etc., meet actual operation requirements.
To solve the above problems, the technical solution used in the present invention is as follows：
For the spraying-free high-surface gloss traceless injection molding process of LED television fore shell, following steps are specifically included：
Step（1）, mold design：Shape and structure according to needed for LED television fore shell uses click-through more than hot flow path and cold runner
Material sub-marine gate design injection mold, the injection mold uses good polishability, high-purity, minute surface degree high and thermal deformation small
Mould steel, and the injection mold is provided with the profile-followed water channel of die cavity, and increase thermal insulation layer at its back side or utilize space
It is heat-insulated, to improve the mold temperature uniformity；
Step（2）, sorting：From PMMA or PC/ABS or high-light ABS material as injection material；
Step（3）, drying：Injected plastics material is placed in injection machine drying box and is dried 4-6 hours with 65-75 DEG C, make its humidity
Less than 0.04%, after take automatical feeding system continuous feeding；
Step（4）, mould preheating：Injection mold is correctly installed on injection machine, heat flow system pair is passed through before matched moulds is produced
Injection mold is preheated, and preheating temperature is set to 75-95 DEG C；
Step（5）, matched moulds, transient heating：During matched moulds, high temperature hot gas are circulated into profile-followed water channel by heat flow system, by mould
Temperature moment rise to 115-125 DEG C, and the temperature of the high temperature hot gas stream is 165-175 DEG C, the pressure of the high temperature hot gas stream
It is by force 0.2-0.3Mpa；
Step（6）, three-level injection：Injection machine is injected to injection mold, and pressure is divided into 3 grades of injection stage controls during injection
System：The first order takes injection pressure 80%~90%, injection speed 15%~20%, screw rod switching position to be adjusted to molten plastic
By runner just into the volume of die cavity 5% or so；Injection pressure is taken in 90%~100%, injection speed in the second level
20%~40% screw rod switching position is adjusted to plastic melt filling die cavity 80% or so；The third level takes injection pressure to exist
85%~95%, injection speed 10%~20%, screw rod switching position is adjusted to plastic melt filling die cavity 99% or so；
Step（7）, quick cooling：Using 4 DEG C -8 DEG C that cooling system is controlled of cold airflow, with compression pump toward in profile-followed water channel
Injection cold airflow carries out instantaneous cooling, and cooling completes to be blown into the warm air stream that temperature is 20 DEG C -30 DEG C in backward profile-followed water channel, will
Cold airflow in profile-followed water channel takes mould out of, is normally carried out in order to next injection cycle；
Step（8）, die sinking pickup：After die sinking, mould air blowing road and profile-followed water channel are carried out with the air pressure of 0.4-0.8Mpa
Cleaning impurity and dried process.
Used as the improvement of above-mentioned technical proposal, the profile-followed water channel is in injection molding process according to LED television fore shell
In uneven in temperature even and LED television fore shell shape and structure change design the density of shape, width and the arrangement of water channel,
And it is larger according to LED television fore shell products thickness or place of larger or structural mutation changes profile-followed water channel cross sectional shape
Or widen water channel or increase the quantity of profile-followed water channel.
As the improvement of above-mentioned technical proposal, step（4）The heat flow system includes temperature-compensating room, the temperature-compensating
Interior is provided with air stream outlet, and air inlet is provided with the temperature-compensating room, and induction heat is provided with the temperature-compensating room
Flow medium, Cycle Unit and dry fiber tube.
As the improvement of above-mentioned technical proposal, step（7）The cold flow system makes include temperature-compensating room, the temperature-compensating
Interior is provided with the air stream outlet being connected with the pressure water pump, and air inlet, the temperature are provided with the temperature-compensating room
Sensing cold flow medium, Cycle Unit are provided with degree compensated chamber and fiber tube is dried.
Compared with prior art, implementation result of the invention is as follows for the present invention：
A kind of spraying-free high-surface gloss traceless injection molding process for LED television fore shell of the present invention, injection mold is adopted
Designed with hot flow path and cold runner multiple feed sub-marine gate, solve plastic melt and there are problems that, while
The crucial portion of product improves the structure of corresponding hot flow path and cold runner, and using heat flow system and cold flow system makes coordinate product into
Type technique is used, and then greatly improves product appearance quality, shaping qualification rate etc., meets actual operation requirements.
Additionally, the present invention without spraying etc. operation, considerably reduce the pollution to environment, reach environmental protection and save will
Ask.
Brief description of the drawings
Fig. 1 is that the spraying-free high-surface gloss traceless injection molding process flow for LED television fore shell of the present invention is shown
It is intended to；
Fig. 2 is heat flow system structural representation of the present invention；
Fig. 3 is cold flow system makes structural representation of the present invention.
Specific embodiment
Illustrate present disclosure below in conjunction with specific embodiments.
Specific embodiment 1
As Figure 1-3, it is the spraying-free high-surface gloss traceless injection molding work for LED television fore shell described in the present embodiment
Skill, specifically includes following steps：
Step（1）, mold design：Shape and structure according to needed for LED television fore shell uses click-through more than hot flow path and cold runner
Material sub-marine gate design injection mold, injection mold uses good polishability, high-purity, minute surface degree high and the small mould of thermal deformation
Steel, and injection mold is provided with the profile-followed water channel of die cavity, and increase thermal insulation layer or heat-insulated using space at its back side, so as to
Improve the mold temperature uniformity；
Step（2）, sorting：From PMMA or PC/ABS or high-light ABS material as injection material；
Step（3）, drying：Injected plastics material is placed in injection machine drying box and is dried 4 hours with 65 DEG C, be less than its humidity
0.04%, after take automatical feeding system continuous feeding；
Step（4）, mould preheating：Injection mold is correctly installed on injection machine, heat flow system pair is passed through before matched moulds is produced
Injection mold is preheated, and preheating temperature is set to 75 DEG C；
Step（5）, matched moulds, transient heating：During matched moulds, high temperature hot gas are circulated into profile-followed water channel by heat flow system, by mould
Temperature moment rise to 115 DEG C, and the temperature of high temperature hot gas stream is 165 DEG C, and the pressure of high temperature hot gas stream is 0.2Mpa；
Step（6）, three-level injection：Injection machine is injected to injection mold, and pressure is divided into 3 grades of injection stage controls during injection
System：The first order takes injection pressure 80%, injection speed 15%, and screw rod switching position is adjusted to molten plastic by runner just
Into the volume of die cavity 5% or so；Injection pressure is taken in 90%, the adjustment of the screw rod switching position of injection speed 20% in the second level
Die cavity 80% or so is filled to plastic melt；The third level takes injection pressure in 85%, injection speed 10%, screw rod switching
Position adjustment fills die cavity 99% or so to plastic melt；
Step（7）, quick cooling：Using 4 DEG C that cooling system is controlled of cold airflow, with compression pump 80 toward note in profile-followed water channel
Penetrating cold airflow carries out instantaneous cooling, and cooling completes to be blown into the warm air stream that temperature is 20 DEG C in backward profile-followed water channel, by profile-followed water
Cold airflow in road takes mould out of, is normally carried out in order to next injection cycle；
Step（8）, die sinking pickup：After die sinking, mould air blowing road and profile-followed water channel are cleared up with the air pressure of 0.4Mpa
Impurity and dried process.
Further with improvement, profile-followed water channel is uneven in temperature even in injection molding process according to LED television fore shell
And the shape and structure of LED television fore shell changes to design the density of shape, width and the arrangement of water channel, and according to LED television
Machine fore shell products thickness is larger or place of larger or structural mutation changes profile-followed water channel cross sectional shape or widen water channel or
Increase the quantity of profile-followed water channel.
Specifically, step（4）The heat flow system includes that being provided with air-flow in temperature-compensating room 10, temperature-compensating room 10 goes out
Mouth 20, is provided with air inlet 30, temperature-compensating room 10 on temperature-compensating room 10 and is provided with induction heat flow medium 60, Cycle Unit
40 and dry fiber tube 50；Step（7）The cold flow system makes include being provided with and pressure in temperature-compensating room 10, temperature-compensating room 10
The air stream outlet 20 that pump 80 is connected, is provided with air inlet 30, temperature-compensating room 10 on temperature-compensating room 10 and is provided with sensing
Cold flow medium 70, Cycle Unit 40 and dry fiber tube 50.
Spraying-free high-surface gloss traceless injection molding process for LED television fore shell of the present invention, solves plastics
Melt there are problems that, while improving the structure of corresponding hot flow path and cold runner in the crucial portion of product, and use
Heat flow system and cold flow system makes coordinate product forming technique to use, and then greatly improve product appearance quality, shaping qualification rate
Deng meeting actual operation requirements.
Additionally, the present invention without spraying etc. operation, considerably reduce the pollution to environment, reach environmental protection and save will
Ask.
Specific embodiment 2
As Figure 1-3, it is the spraying-free high-surface gloss traceless injection molding work for LED television fore shell described in the present embodiment
Skill, specifically includes following steps：
Step（1）, mold design：Shape and structure according to needed for LED television fore shell uses click-through more than hot flow path and cold runner
Material sub-marine gate design injection mold, injection mold uses good polishability, high-purity, minute surface degree high and the small mould of thermal deformation
Steel, and injection mold is provided with the profile-followed water channel of die cavity, and increase thermal insulation layer or heat-insulated using space at its back side, so as to
Improve the mold temperature uniformity；
Step（2）, sorting：From PMMA or PC/ABS or high-light ABS material as injection material；
Step（3）, drying：Injected plastics material is placed in injection machine drying box and is dried 5 hours with 70 DEG C, be less than its humidity
0.04%, after take automatical feeding system continuous feeding；
Step（4）, mould preheating：Injection mold is correctly installed on injection machine, heat flow system pair is passed through before matched moulds is produced
Injection mold is preheated, and preheating temperature is set to 85 DEG C；
Step（5）, matched moulds, transient heating：During matched moulds, high temperature hot gas are circulated into profile-followed water channel by heat flow system, by mould
Temperature moment rise to 120 DEG C, and the temperature of high temperature hot gas stream is 170 DEG C, and the pressure of high temperature hot gas stream is 0.25Mpa；
Step（6）, three-level injection：Injection machine is injected to injection mold, and pressure is divided into 3 grades of injection stage controls during injection
System：The first order takes injection pressure 85%, injection speed 17.5%, and it is firm by runner that screw rod switching position is adjusted to molten plastic
Enter the volume of die cavity 5% or so well；The second level takes injection pressure 95%, and the screw rod switching position of injection speed 30% is adjusted
It is whole to fill die cavity 80% or so to plastic melt；The third level takes injection pressure in 90%, injection speed 15%, screw rod
Switching position is adjusted to plastic melt filling die cavity 99% or so；
Step（7）, quick cooling：Using 6 DEG C that cooling system is controlled of cold airflow, with compression pump 80 toward note in profile-followed water channel
Penetrating cold airflow carries out instantaneous cooling, and cooling completes to be blown into the warm air stream that temperature is 25 DEG C in backward profile-followed water channel, by profile-followed water
Cold airflow in road takes mould out of, is normally carried out in order to next injection cycle；
Step（8）, die sinking pickup：After die sinking, mould air blowing road and profile-followed water channel are cleared up with the air pressure of 0.6Mpa
Impurity and dried process.
Further with improvement, profile-followed water channel is uneven in temperature even in injection molding process according to LED television fore shell
And the shape and structure of LED television fore shell changes to design the density of shape, width and the arrangement of water channel, and according to LED television
Machine fore shell products thickness is larger or place of larger or structural mutation changes profile-followed water channel cross sectional shape or widen water channel or
Increase the quantity of profile-followed water channel.
Specifically, step（4）The heat flow system includes that being provided with air-flow in temperature-compensating room 10, temperature-compensating room 10 goes out
Mouth 20, is provided with air inlet 30, temperature-compensating room 10 on temperature-compensating room 10 and is provided with induction heat flow medium 60, Cycle Unit
40 and dry fiber tube 50；Step（7）The cold flow system makes include being provided with and pressure in temperature-compensating room 10, temperature-compensating room 10
The air stream outlet 20 that pump 80 is connected, is provided with air inlet 30, temperature-compensating room 10 on temperature-compensating room 10 and is provided with sensing
Cold flow medium 70, Cycle Unit 40 and dry fiber tube 50.
A kind of spraying-free high-surface gloss traceless injection molding process for LED television fore shell of the present invention, injection mould
Tool is designed using hot flow path and cold runner multiple feed sub-marine gate, is solved plastic melt and be there are problems that, together
When improve the structure of corresponding hot flow path and cold runner in the crucial portion of product, and coordinated using heat flow system and cold flow system makes and produce
Product moulding process is used, and then greatly improves product appearance quality, shaping qualification rate etc., meets actual operation requirements.
Additionally, the present invention without spraying etc. operation, considerably reduce the pollution to environment, reach environmental protection and save will
Ask.
Specific embodiment 3
As Figure 1-3, it is the spraying-free high-surface gloss traceless injection molding work for LED television fore shell described in the present embodiment
Skill, specifically includes following steps：
Step（1）, mold design：Shape and structure according to needed for LED television fore shell uses click-through more than hot flow path and cold runner
Material sub-marine gate design injection mold, injection mold uses good polishability, high-purity, minute surface degree high and the small mould of thermal deformation
Steel, and injection mold is provided with the profile-followed water channel of die cavity, and increase thermal insulation layer or heat-insulated using space at its back side, so as to
Improve the mold temperature uniformity；
Step（2）, sorting：From PMMA or PC/ABS or high-light ABS material as injection material；
Step（3）, drying：Injected plastics material is placed in injection machine drying box and is dried 6 hours with 75 DEG C, be less than its humidity
0.04%, after take automatical feeding system continuous feeding；
Step（4）, mould preheating：Injection mold is correctly installed on injection machine, heat flow system pair is passed through before matched moulds is produced
Injection mold is preheated, and preheating temperature is set to 95 DEG C；
Step（5）, matched moulds, transient heating：During matched moulds, high temperature hot gas are circulated into profile-followed water channel by heat flow system, by mould
Temperature moment rise to 125 DEG C, and the temperature of high temperature hot gas stream is 175 DEG C, and the pressure of high temperature hot gas stream is 0.3Mpa；
Step（6）, three-level injection：Injection machine is injected to injection mold, and pressure is divided into 3 grades of injection stage controls during injection
System：The first order takes injection pressure 90%, injection speed 20%, and screw rod switching position is adjusted to molten plastic by runner just
Into the volume of die cavity 5% or so；The second level takes injection pressure 100%, and the screw rod switching position of injection speed 40% is adjusted
It is whole to fill die cavity 80% or so to plastic melt；The third level takes injection pressure in 95%, injection speed 20%, screw rod
Switching position is adjusted to plastic melt filling die cavity 99% or so；
Step（7）, quick cooling：Using 8 DEG C that cooling system is controlled of cold airflow, with compression pump 80 toward note in profile-followed water channel
Penetrating cold airflow carries out instantaneous cooling, and cooling completes to be blown into the warm air stream that temperature is 30 DEG C in backward profile-followed water channel, by profile-followed water
Cold airflow in road takes mould out of, is normally carried out in order to next injection cycle；
Step（8）, die sinking pickup：After die sinking, mould air blowing road and profile-followed water channel are cleared up with the air pressure of 0.8Mpa
Impurity and dried process.
Further with improvement, profile-followed water channel is uneven in temperature even in injection molding process according to LED television fore shell
And the shape and structure of LED television fore shell changes to design the density of shape, width and the arrangement of water channel, and according to LED television
Machine fore shell products thickness is larger or place of larger or structural mutation changes profile-followed water channel cross sectional shape or widen water channel or
Increase the quantity of profile-followed water channel.
Specifically, step（4）The heat flow system includes that being provided with air-flow in temperature-compensating room 10, temperature-compensating room 10 goes out
Mouth 20, is provided with air inlet 30, temperature-compensating room 10 on temperature-compensating room 10 and is provided with induction heat flow medium 60, Cycle Unit
40 and dry fiber tube 50；Step（7）The cold flow system makes include being provided with and pressure in temperature-compensating room 10, temperature-compensating room 10
The air stream outlet 20 that pump 80 is connected, is provided with air inlet 30, temperature-compensating room 10 on temperature-compensating room 10 and is provided with sensing
Cold flow medium 70, Cycle Unit 40 and dry fiber tube 50.
A kind of spraying-free high-surface gloss traceless injection molding process for LED television fore shell of the present invention, injection mould
Tool is designed using hot flow path and cold runner multiple feed sub-marine gate, is solved plastic melt and be there are problems that, with
And coordinate product forming technique to use using heat flow system and cold flow system makes, and then greatly improve product appearance quality, shaping
Qualification rate etc., meets actual operation requirements.
Additionally, the present invention without spraying etc. operation, considerably reduce the pollution to environment, reach environmental protection and save will
Ask.
Note：The value shell of parameter in moulding process of the present invention in span can reach according to actually required
The fineness of product sets.
Above content is detailed description made for the present invention in conjunction with specific embodiments, 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, should all be considered as belonging to the scope of protection of the invention.
Claims (4)
1. the spraying-free high-surface gloss traceless injection molding process of LED television fore shell is used for, it is characterised in that：Specifically include following step
Suddenly：
Step（1）, mold design：Shape and structure according to needed for LED television fore shell uses click-through more than hot flow path and cold runner
Material sub-marine gate design injection mold, the injection mold uses good polishability, high-purity, minute surface degree high and thermal deformation small
Mould steel, and the injection mold is provided with the profile-followed water channel of die cavity, and increase thermal insulation layer at its back side or utilize space
It is heat-insulated, to improve the mold temperature uniformity；
Step（2）, sorting：From PMMA or PC/ABS or high-light ABS material as injection material；
Step（3）, drying：Injected plastics material is placed in injection machine drying box and is dried 4-6 hours with 65-75 DEG C, make its humidity
Less than 0.04%, after take automatical feeding system continuous feeding；
Step（4）, mould preheating：Injection mold is correctly installed on injection machine, heat flow system pair is passed through before matched moulds is produced
Injection mold is preheated, and preheating temperature is set to 75-95 DEG C；
Step（5）, matched moulds, transient heating：During matched moulds, high temperature hot gas are circulated into profile-followed water channel by heat flow system, by mould
Temperature moment rise to 115-125 DEG C, and the temperature of the high temperature hot gas stream is 165-175 DEG C, the pressure of the high temperature hot gas stream
It is by force 0.2-0.3Mpa；
Step（6）, three-level injection：Injection machine is injected to injection mold, and pressure is divided into 3 grades of injection stage controls during injection
System：The first order takes injection pressure 80%~90%, injection speed 15%~20%, screw rod switching position to be adjusted to molten plastic
By runner just into the volume of die cavity 5% or so；Injection pressure is taken in 90%~100%, injection speed in the second level
20%~40% screw rod switching position is adjusted to plastic melt filling die cavity 80% or so；The third level takes injection pressure to exist
85%~95%, injection speed 10%~20%, screw rod switching position is adjusted to plastic melt filling die cavity 99% or so；
Step（7）, quick cooling：Using 4 DEG C -8 DEG C that cooling system is controlled of cold airflow, compression pump is used（80）Toward profile-followed water
Cold airflow is injected in road carries out instantaneous cooling, and cooling completes to be blown into the warm air that temperature is 20 DEG C -30 DEG C in backward profile-followed water channel
Stream, takes the cold airflow in profile-followed water channel out of mould, is normally carried out in order to next injection cycle；
Step（8）, die sinking pickup：After die sinking, mould air blowing road and profile-followed water channel are carried out with the air pressure of 0.4-0.8Mpa
Cleaning impurity and dried process.
2. the spraying-free high-surface gloss traceless injection molding process of LED television fore shell is used for according to claim 1, and its feature exists
In：The profile-followed water channel is the uneven in temperature even and LED television fore shell in injection molding process according to LED television fore shell
Shape and structure change design the density of shape, width and the arrangement of water channel, and according to LED television fore shell products thickness compared with
The place of big or larger or structural mutation changes profile-followed water channel cross sectional shape or widens water channel or increase the number of profile-followed water channel
Amount.
3. the spraying-free high-surface gloss traceless injection molding process of LED television fore shell is used for according to claim 1, and its feature exists
In：Step（4）The heat flow system includes temperature-compensating room（10）, the temperature-compensating room（10）Inside it is provided with air stream outlet
（20）, the temperature-compensating room（10）On be provided with air inlet（30）, the temperature-compensating room（10）Inside it is provided with sensing hot-fluid
Medium（60）, Cycle Unit（40）And dry fiber tube（50）.
4. the spraying-free high-surface gloss traceless injection molding process of LED television fore shell is used for according to claim 1, and its feature exists
In：Step（7）The cold flow system makes include temperature-compensating room（10）, the temperature-compensating room（10）Inside it is provided with and the pressure
Pump（80）The air stream outlet being connected（20）, the temperature-compensating room（10）On be provided with air inlet（30）, the temperature-compensating
Room（10）Inside it is provided with sensing cold flow medium（70）, Cycle Unit（40）And dry fiber tube（50）.
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| CN113997493A (en) * | 2021-10-28 | 2022-02-01 | 东风彼欧汽车外饰***有限公司 | Production process of automobile grille |
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