CN105666780A - High-glossiness injection molding process - Google Patents
High-glossiness injection molding process Download PDFInfo
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- CN105666780A CN105666780A CN201610137623.2A CN201610137623A CN105666780A CN 105666780 A CN105666780 A CN 105666780A CN 201610137623 A CN201610137623 A CN 201610137623A CN 105666780 A CN105666780 A CN 105666780A
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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
- B29B—PREPARATION OR PRETREATMENT OF THE MATERIAL TO BE SHAPED; MAKING GRANULES OR PREFORMS; RECOVERY OF PLASTICS OR OTHER CONSTITUENTS OF WASTE MATERIAL CONTAINING PLASTICS
- B29B13/00—Conditioning or physical treatment of the material to be shaped
- B29B13/06—Conditioning or physical treatment of the material to be shaped by drying
-
- 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
-
- 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
- B29C45/7312—Construction of heating or cooling fluid flow 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
- B29C45/76—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
- 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
- B29C2945/76494—Controlled parameter
- B29C2945/76551—Time
Abstract
The invention discloses a high-glossiness injection molding process. The process includes the following steps of plasticizing, injection, pressure maintaining, cooling, die opening, workpiece taking, die closing and the like. According to the process, a novel intra-die water medium electric heating rapid heat cycle method is adopted, and energy consumption generated in the die heating process is only 1,250 KJ which is about half the energy consumption generated in a steam heating RHCM die and is two thirds of energy consumption of a conventional electric heating RHCM die under the same condition; and in addition, according to an RHCM high-glossiness die of a novel rapid heating and cooling system developed based on the high-glossiness injection molding process, the required water consumption is reduced remarkably and is only about 60% that of the conventional steam heating RHCM die and the electric heating RHCM die.
Description
Technical field
The present invention relates to technology of die manufacturing field, particularly relate to a kind of high optoinjection moulding process.
Background technology
Current shell body injection molding process is to be injected in mold cavity by molten plastic, forms required shell product after cooling, and shell product is that opening mold takes out product after reaching to eject temperature. When adopting conventional injection molding technology to produce, the problem often suffering from many molding, particularly apparent product surface smoothness problem, for instance the defects such as joint line, surface brightness, flow liner, indenture.
In recent years, the 3C Product such as mobile phone, notebook computer, PDA makes rapid progress. Along with 3C goods are to pursuit small and exquisite, light, novel, fashion, shell working of plastics is just becoming a main trend of injection moulding product. Shell injection moulding production efficiency is high, can significantly save material, reduces cost, alleviates quality of item and reduces overall dimensions, has outstanding advantages such as being easy to Integrated design and assembling. But, shell injection moulding is higher to the requirement of technological parameter, and forming process is more complicated, and the change of process conditions is more sensitive, is more readily formed defect in forming process. And some shell goods is due to function or otherwise needs, pore structure often can be designed again in its surface so that product defect increases the weight of. The apparent mass of high-end product is generally desirable that Gao Guang (mirror surface accuracy), is not allow for the defects such as indenture, current mark, weld mark, ripple and filamentary silver stricture of vagina and to have certain intensity, and common injection molding technique is difficult to meet the requirement of this respect.
Along with the continuous lifting that product function requires, the structural design of plastic product becomes increasingly complex, and prescription also improves constantly. Under taking into account the multiple demands such as the structural strength of product, precision, production cycle, energy-conserving and environment-protective, plastic product forming technique is constantly weeded out the old and bring forth the new. Injection moulding, also known as quick-cooling, heating molding (RHCM) and vapor injection molding etc., is a kind of injection molding technology emerging in recent years. Its principle makes the temperature in mould raise rapidly and reduce mainly by three-dimensional without converging line mould and temperature control device so that working of plastics apparent mass be improved significantly. This technology can the shape on copy mold surface well, make the defects such as product surface weldless trace, current mark, surface gloss is high, and intensity and case hardness are improved, and without follow-up spraying coating process.
Summary of the invention
The invention aims to the shortcoming solving exist in prior art, and the high optoinjection moulding process of one proposed.
To achieve these goals, the present invention proposes a kind of high optoinjection moulding process, comprises the steps:
S1, selection suitable material are as injection material, and it is dry 2-4 hour with 80-112 DEG C in 101-3A air dry oven that injection material is placed on specifications and models so that it is humidity is less than 0.06%;
Before S2, beginning injection moulding, mould is fixed on injection machine, aqueous medium electrical heating rapid thermal cycles method in New-type mould is adopted to preheat before matched moulds, namely, when mould heats, the annular gap between electrically heated rod and the hole wall of corresponding installing hole is first full of water, and closes the pneumatic operated valve of water inlet and outlet, by watertight in the duct, then electrically heated rod energising, uses water as heat transfer medium and mould is heated, and preheating temperature is 70-90 DEG C;
When S3, matched moulds, being adjusted to 140 DEG C-160 DEG C, the high-temperature medium water that pressure is 0.1-0.4MPa passes through the irregular water channel after optimizing, and mould carries out transient heating 110 DEG C-120 DEG C;
After S4, matched moulds complete, mould is injected by injector; During injection, injection pressure and time are divided into the injection pressure of 2 times and the control of time, i.e. the 50%-60% of the 75%-85% of most high injection pressure, most high injection pressure, namely at melt temperature 200-2400C, injection time 1.5-3.0s, first paragraph dwell pressure is 20-40MPa, first paragraph dwell time to be 2.0-4.0s, second segment dwell pressure be 70-90MPa, second segment dwell time be injection pressurize in 10-12s;
S5, mold temperature depression of order section rapidly: after removing condensed water, frozen water enters in mould steam pipework, now frozen water force value is 4.5-6MPa, frozen water temperature, between 8-12 DEG C, crosses water time 20-35s, reduces mold temperature rapidly between 60-70 DEG C, compression air is passed into again in mould aqueous medium pipeline, now compressed-air actuated pressure is 8MPa, gassing time 6s-10s, removes residual hydrops in mould pipeline;
S6, mould die sinking stage: injection moulding machine die sinking, take out the product in mould.
Preferably, described injection material is polymethyl methacrylate (PMMA) or acrylonitrile-butadiene-styrene copolymer (ABS) or polyamide (PA) or Merlon (PC).
Preferably, the general power of described electrically heated rod and power density respectively 45-50KW and 15-25W/cm2, the diameter of described electrically heated rod and the corresponding mounting hole respectively 8mm and 10mm, from the center of electrically heated rod to the distance of mold cavity surface be 12mm.
Preferably, at melt temperature 230 in described S4 step0C, injection time 2.5s, first paragraph dwell pressure is 30MPa, the first paragraph dwell time is 3.0s, second segment dwell pressure is 80MPa, the second segment dwell time is 11s, when other molding proces s parameters and condition are constant, reduction with first paragraph dwell pressure, the four-way deformation of high light plastic product tapers into, first paragraph low pressure holding pressure is described, plastic core side can be made to have bigger amount of contraction, dwell pressure again through second segment, adequately compensate for the volume contraction in cavity side plastic solution process of setting, the receipts amount of plastic cavity side can be reduced, thus effectively suppress flat panel TV height light fore shell plastic concave towards deformation, meet and produce matching requirements, adopt this Optimizing Process Parameters wing song deformation values of obtaining of combination to be significantly less than in orthogonal experiment other each parameter and combine the wing song deformation values obtained, illustrate that the parameter after this optimization is highly effective.
Preferably, in described S5 step, the water time is 30s excessively.
Preferably, in described S2 step, pneumatic operated valve is the pneumatic angle of rifling seat valve of inside nominal diameter DN10, nominal pressure PN40, and the maximum pressure that can bear of pneumatic angle of rifling seat valve is 4.0MPa, and pneumatic operating pressure is 3.5Br.
Preferably, the injection machine in described S2 step adopts BS800-Injection machine, its clamp force is 8000kN, and maximum injection pressure is 2090Br, and spiral shell beats diameter 100mm spiral shell, and to beat the ratio (L/D) of length and its diameter be 22.
The high optoinjection moulding process of one provided by the invention, compared with prior art, the present invention is a kind of high optoinjection moulding process, the present invention adopt New-type mould in aqueous medium electrical heating rapid thermal cycles method mould add the energy expenditure hankered be only 1250KJ be about steam heating RHCM mould energy expenditure half, it is under the same terms 2/3rds of conventional electrical heating RHCM mould energy expenditure, in addition, RHCM height gloss mold based on the Novel rapid-heating of present invention exploitation and but system, required water consumption substantially reduces, it is only about the 60% of conventional steam heating and electrical heating RHCM mould, the present invention aqueous medium electrical heating rapid thermal cycles method is based on electrical heating and water-cooled but in the New-type mould of ten thousand, compared with conventional electrical heating RHCM mould, the most significant difference of of new method is in that electrically heated rod is not be close to installation hole wall, but leave certain interval, it is possible to pass into water as heating and cooling medium, the existence in this gap can be greatly simplified the installation and removal of electrically heated rod, it is also possible to uses this gap to import aqueous medium as passage mould is heated and cools down, additionally, it is overheated to be effectively prevented from electrically heated rod around the water around electrically heated rod, thus improve the service life of electrically heated rod, when mould cools down, electrically heated rod stops energising, opens the pneumatic operated valve of water inlet and outlet simultaneously, the low-temperature cooling water of certain pressure passes into annular gas passageway to cool down mould, the circular cooling duct conventional due to the sectional area ratio of annular cooling channel is much smaller, and the cooling water passed through in this circular passage more easily reaches auspicious stream mode, it is possible to improve cooling effectiveness further, meanwhile, because the sectional area of this system inner cooling water is less, the consumption therefore cooling down water can also reduce, additionally, compared with conventional electric-heating die, the cooling duct of new system is closer to die surface, it helps improve heating and cooling effectiveness, except above advantage, this new electric-heating die does not need separately to set independent cooling duct, it is not required that the coldplate of design float type cavity plate and separate type, therefore can simplify again mould structure, improves mould strength, reduces the manufacturing cost of mould.
Detailed description of the invention
In order to make the purpose of the present invention, technical scheme and advantage clearly understand, below in conjunction with specific embodiment, the present invention is further elaborated. Specific embodiment described herein only in order to explain the present invention, is not intended to limit the present invention.
Embodiment 1
A kind of high optoinjection moulding process, comprises the steps:
S1, selection suitable material are as injection material, and it is dry 2.5 hours with 85 DEG C in 101-3A air dry oven that injection material is placed on specifications and models so that it is humidity is less than 0.05%;
Before S2, beginning injection moulding, being fixed on injection machine by mould, injection machine adopts BS800-Injection machine, its clamp force is 8000kN, injection pressure is 1800Br, spiral shell beats diameter 100mm spiral shell, and to beat the ratio (L/D) of length and its diameter be 22, aqueous medium electrical heating rapid thermal cycles method in New-type mould is adopted to preheat before matched moulds, namely when mould heats, annular gap between electrically heated rod and the hole wall of corresponding installing hole is first full of water, and close the pneumatic operated valve of water inlet and outlet, pneumatic operated valve is inside nominal diameter DN10, the pneumatic angle of rifling seat valve of nominal pressure PN40, the maximum pressure that can bear of pneumatic angle of rifling seat valve is 4.0MPa, pneumatic operating pressure is 3.5Br, by watertight in the duct, then electrically heated rod energising, the general power of electrically heated rod and power density respectively 40KW and 15W/cm2, the diameter of electrically heated rod and the corresponding mounting hole respectively 8mm and 10mm, it is 12mm from the center of electrically heated rod to the distance of mold cavity surface, uses water as heat transfer medium and mould is heated, preheating temperature is 75 DEG C;
When S3, matched moulds, being adjusted to 140 DEG C, the high-temperature medium water that pressure is 0.15MPa passes through the irregular water channel after optimizing, and mould carries out transient heating 110 DEG C;
After S4, matched moulds complete, mould is injected by injector; During injection, injection pressure and time are divided into the injection pressure of 2 times and the control of time, namely the 75% of most high injection pressure, most high injection pressure 50%, namely at melt temperature 2000C, injection time 1.5s, first paragraph dwell pressure is 20MPa, first paragraph dwell time to be 2.0s, second segment dwell pressure be 70MPa, second segment dwell time be injection pressurize in 10s;
S5, mold temperature depression of order section rapidly: after removing condensed water, frozen water enters in mould steam pipework, now frozen water force value is 4.5-6MPa, frozen water temperature, at 10 DEG C, crosses water time 20s, reduces mold temperature rapidly between 60 DEG C, compression air is passed into again in mould aqueous medium pipeline, now compressed-air actuated pressure is 8MPa, gassing time 6s, removes residual hydrops in mould pipeline;
S6, mould die sinking stage: injection moulding machine die sinking, take out the product in mould.
Embodiment 2
A kind of high optoinjection moulding process, comprises the steps:
S1, selection suitable material are as injection material, and it is dry 2.8 hours with 95 DEG C in 101-3A air dry oven that injection material is placed on specifications and models so that it is humidity is less than 0.04%;
Before S2, beginning injection moulding, being fixed on injection machine by mould, injection machine adopts BS800-Injection machine, its clamp force is 8000kN, injection pressure is 2000Br, spiral shell beats diameter 100mm spiral shell, and to beat the ratio (L/D) of length and its diameter be 22, aqueous medium electrical heating rapid thermal cycles method in New-type mould is adopted to preheat before matched moulds, namely when mould heats, annular gap between electrically heated rod and the hole wall of corresponding installing hole is first full of water, and close the pneumatic operated valve of water inlet and outlet, pneumatic operated valve is inside nominal diameter DN10, the pneumatic angle of rifling seat valve of nominal pressure PN40, the maximum pressure that can bear of pneumatic angle of rifling seat valve is 4.0MPa, pneumatic operating pressure is 3.5Br, by watertight in the duct, then electrically heated rod energising, the general power of electrically heated rod and power density respectively 48KW and 20W/cm2, the diameter of electrically heated rod and the corresponding mounting hole respectively 8mm and 10mm, it is 12mm from the center of electrically heated rod to the distance of mold cavity surface, uses water as heat transfer medium and mould is heated, preheating temperature is 90 DEG C;
When S3, matched moulds, being adjusted to 155 DEG C, the high-temperature medium water that pressure is 0.25MPa passes through the irregular water channel after optimizing, and mould carries out transient heating 115 DEG C;
After S4, matched moulds complete, mould is injected by injector; During injection, injection pressure and time are divided into the injection pressure of 2 times and the control of time, namely the 80% of most high injection pressure, most high injection pressure 55%, namely at melt temperature 2300C, injection time 2.5s, first paragraph dwell pressure is 30MPa, the first paragraph dwell time is 3.0s, second segment dwell pressure is 80MPa, the second segment dwell time is 11s, when other molding proces s parameters and condition are constant, reduction with first paragraph dwell pressure, the four-way deformation of high light plastic product tapers into, first paragraph low pressure holding pressure is described, plastic core side can be made to have bigger amount of contraction, dwell pressure again through second segment, adequately compensate for the volume contraction in cavity side plastic solution process of setting, the receipts amount of plastic cavity side can be reduced, thus effectively suppress flat panel TV height light fore shell plastic concave towards deformation, meet and produce matching requirements, adopt this Optimizing Process Parameters wing song deformation values of obtaining of combination to be significantly less than in orthogonal experiment other each parameter and combine the wing song deformation values obtained, illustrate that the parameter after this optimization is highly effective,
S5, mold temperature depression of order section rapidly: after removing condensed water, frozen water enters in mould steam pipework, now frozen water force value is 5.0MPa, frozen water temperature, between 9 DEG C, crosses water time 30s, reduces mold temperature rapidly to 65 DEG C, compression air is passed into again in mould aqueous medium pipeline, now compressed-air actuated pressure is 8MPa, gassing time 5.5s, removes residual hydrops in mould pipeline;
S6, mould die sinking stage: injection moulding machine die sinking, take out the product in mould.
Embodiment 3
A kind of high optoinjection moulding process, comprises the steps:
S1, selection suitable material are as injection material, and it is dry 3 hours with 98 DEG C in 101-3A air dry oven that injection material is placed on specifications and models so that it is humidity is less than 0.035%;
Before S2, beginning injection moulding, being fixed on injection machine by mould, injection machine adopts BS800-Injection machine, its clamp force is 8000kN, injection pressure is 2050Br, spiral shell beats diameter 100mm spiral shell, and to beat the ratio (L/D) of length and its diameter be 22, aqueous medium electrical heating rapid thermal cycles method in New-type mould is adopted to preheat before matched moulds, namely when mould heats, annular gap between electrically heated rod and the hole wall of corresponding installing hole is first full of water, and close the pneumatic operated valve of water inlet and outlet, pneumatic operated valve is inside nominal diameter DN10, the pneumatic angle of rifling seat valve of nominal pressure PN40, the maximum pressure that can bear of pneumatic angle of rifling seat valve is 4.0MPa, pneumatic operating pressure is 3.5Br, by watertight in the duct, then electrically heated rod energising, the general power of electrically heated rod and power density respectively 50KW and 25W/cm2, the diameter of electrically heated rod and the corresponding mounting hole respectively 8mm and 10mm, it is 12mm from the center of electrically heated rod to the distance of mold cavity surface, uses water as heat transfer medium and mould is heated, preheating temperature is 85 DEG C;
When S3, matched moulds, being adjusted to 160 DEG C, the high-temperature medium water that pressure is 0.3MPa passes through the irregular water channel after optimizing, and mould carries out transient heating 120 DEG C;
After S4, matched moulds complete, mould is injected by injector; During injection, injection pressure and time are divided into the injection pressure of 2 times and the control of time, namely the 85% of most high injection pressure, most high injection pressure 60%, namely at melt temperature 2400C, injection time 3.0s, first paragraph dwell pressure is 40MPa, first paragraph dwell time to be 4.0s, second segment dwell pressure be 90MPa, second segment dwell time be injection pressurize in 12s;
S5, mold temperature depression of order section rapidly: after removing condensed water, frozen water enters in mould steam pipework, now frozen water force value is 6MPa, frozen water temperature, between 12 DEG C, crosses water time 35s, reduces mold temperature rapidly between 70 DEG C, compression air is passed into again in mould aqueous medium pipeline, now compressed-air actuated pressure is 8MPa, gassing time 10s, removes residual hydrops in mould pipeline;
S6, mould die sinking stage: injection moulding machine die sinking, take out the product in mould.
In sum: compared with prior art, the present invention adopt New-type mould in aqueous medium electrical heating rapid thermal cycles method mould add the energy expenditure hankered be only 1250KJ be about steam heating RHCM mould energy expenditure half, it is under the same terms 2/3rds of conventional electrical heating RHCM mould energy expenditure, in addition, RHCM height gloss mold based on the Novel rapid-heating of present invention exploitation and but system, required water consumption substantially reduces, and is only about the 60% of conventional steam heating and electrical heating RHCM mould;The present invention aqueous medium electrical heating rapid thermal cycles method is based on electrical heating and water-cooled but in the New-type mould of ten thousand, compared with conventional electrical heating RHCM mould, the most significant difference of of new method is in that electrically heated rod is not be close to installation hole wall, but leave certain interval, it is possible to pass into water as heating and cooling medium; The existence in this gap can be greatly simplified the installation and removal of electrically heated rod, it is also possible to uses this gap to import aqueous medium as passage mould is heated and cools down; The present invention is when mould heats, annular gap between electrically heated rod and the hole wall of corresponding installing hole is full water first, and closes the pneumatic operated valve of water inlet and outlet, by watertight in the duct, then electrically heated rod energising, uses water as heat transfer medium and mould is heated. Due to the existence of aqueous medium in annular gap, electrically heated rod the heat produced uniformly can promptly be diffused into mold cavity, thus the temperature of fast lifting die surface. Because heat produced by electrically heated rod is almost all used to improve mold temperature, it is possible to significantly improving heat transference efficiency, therefore the energy efficiency of electrical heating method can be significantly higher than steam-heated method; Additionally, it is overheated to be effectively prevented from electrically heated rod around the water around electrically heated rod, thus improve the service life of electrically heated rod; When mould cools down, electrically heated rod stops energising, opens the pneumatic operated valve of water inlet and outlet simultaneously, the low-temperature cooling water of certain pressure passes into annular gas passageway to cool down mould; The circular cooling duct conventional due to the sectional area ratio of annular cooling channel is much smaller, and the cooling water passed through in this circular passage more easily reaches auspicious stream mode, it is possible to improve cooling effectiveness further; Meanwhile, because the sectional area of this system inner cooling water is less, the consumption therefore cooling down water can also reduce; Additionally, compared with conventional electric-heating die, the cooling duct of new system is closer to die surface, it helps improve heating and cooling effectiveness; Except above advantage, this new electric-heating die does not need separately to set independent cooling duct, it is not required that the coldplate of design float type cavity plate and separate type, therefore can simplify again mould structure, improves mould strength, reduces the manufacturing cost of mould.
The above; it is only the present invention preferably detailed description of the invention; but protection scope of the present invention is not limited thereto; any those familiar with the art is in the technical scope that the invention discloses; it is equal to replacement according to technical scheme and inventive concept thereof or is changed, all should be encompassed within protection scope of the present invention.
Claims (7)
1. one kind high optoinjection moulding process, it is characterised in that: comprise the steps:
S1, selection suitable material are as injection material, and it is dry 2-4 hour with 80-112 DEG C in 101-3A air dry oven that injection material is placed on specifications and models so that it is humidity is less than 0.06%;
Before S2, beginning injection moulding, mould is fixed on injection machine, aqueous medium electrical heating rapid thermal cycles method in New-type mould is adopted to preheat before matched moulds, namely, when mould heats, the annular gap between electrically heated rod and the hole wall of corresponding installing hole is first full of water, and closes the pneumatic operated valve of water inlet and outlet, by watertight in the duct, then electrically heated rod energising, uses water as heat transfer medium and mould is heated, and preheating temperature is 70-90 DEG C;
When S3, matched moulds, being adjusted to 140 DEG C-160 DEG C, the high-temperature medium water that pressure is 0.1-0.4MPa passes through the irregular water channel after optimizing, and mould carries out transient heating 110 DEG C-120 DEG C;
After S4, matched moulds complete, mould is injected by injector; During injection, injection pressure and time are divided into the injection pressure of 2 times and the control of time, i.e. the 50%-60% of the 75%-85% of most high injection pressure, most high injection pressure, namely at melt temperature 200-2400C, injection time 1.5-3.0s, first paragraph dwell pressure is 20-40MPa, first paragraph dwell time to be 2.0-4.0s, second segment dwell pressure be 70-90MPa, second segment dwell time be injection pressurize in 10-12s;
S5, mold temperature depression of order section rapidly: after removing condensed water, frozen water enters in mould steam pipework, now frozen water force value is 4.5-6MPa, frozen water temperature, between 8-12 DEG C, crosses water time 20-35s, reduces mold temperature rapidly between 60-70 DEG C, compression air is passed into again in mould aqueous medium pipeline, now compressed-air actuated pressure is 8MPa, gassing time 6s-10s, removes residual hydrops in mould pipeline;
S6, mould die sinking stage: injection moulding machine die sinking, take out the product in mould.
2. the high optoinjection moulding process of one according to claim 1, it is characterised in that: described injection material is polymethyl methacrylate (PMMA) or acrylonitrile-butadiene-styrene copolymer (ABS) or polyamide (PA) or Merlon (PC).
3. the high optoinjection moulding process of one according to claim 1, it is characterised in that: the general power of described electrically heated rod and power density respectively 45-50KW and 15-25W/cm2, the diameter of described electrically heated rod and the corresponding mounting hole respectively 8mm and 10mm, from the center of electrically heated rod to the distance of mold cavity surface be 12mm.
4. the high optoinjection moulding process of one according to claim 1, it is characterised in that: at melt temperature 230 in described S4 step0C, injection time 2.5s, first paragraph dwell pressure is 30MPa, the first paragraph dwell time is 3.0s, second segment dwell pressure is 80MPa, the second segment dwell time is 11s, when other molding proces s parameters and condition are constant, reduction with first paragraph dwell pressure, the four-way deformation of high light plastic product tapers into, first paragraph low pressure holding pressure is described, plastic core side can be made to have bigger amount of contraction, dwell pressure again through second segment, adequately compensate for the volume contraction in cavity side plastic solution process of setting, the receipts amount of plastic cavity side can be reduced, thus effectively suppress flat panel TV height light fore shell plastic concave towards deformation, meet and produce matching requirements, adopt this Optimizing Process Parameters wing song deformation values of obtaining of combination to be significantly less than in orthogonal experiment other each parameter and combine the wing song deformation values obtained, illustrate that the parameter after this optimization is highly effective.
5. the high optoinjection moulding process of one according to claim 1, it is characterised in that: in described S5 step, the water time is 30s excessively.
6. the high optoinjection moulding process of one according to claim 1, it is characterized in that: in described S2 step, pneumatic operated valve is the pneumatic angle of rifling seat valve of inside nominal diameter DN10, nominal pressure PN40, the maximum pressure that can bear of pneumatic angle of rifling seat valve is 4.0MPa, and pneumatic operating pressure is 3.5Br.
7. the high optoinjection moulding process of one according to claim 1, it is characterised in that: the injection machine in described S2 step adopts BS800-Injection machine, its clamp force is 8000kN, and maximum injection pressure is 2090Br, and spiral shell beats diameter 100mm spiral shell, and to beat the ratio (L/D) of length and its diameter be 22.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106671347A (en) * | 2017-01-10 | 2017-05-17 | 佛山市顺德区百年科技有限公司 | Injection molding method and plastic part |
| CN107477265A (en) * | 2017-09-08 | 2017-12-15 | 康泰塑胶科技集团有限公司 | A kind of heavy caliber reinforcement tubing and preparation method thereof |
| CN108688114A (en) * | 2018-06-12 | 2018-10-23 | 浙江工业大学 | It is a kind of quickly to become mould temperature injection molding forming method and its former |
| CN111086153A (en) * | 2020-03-25 | 2020-05-01 | 宁波四维尔工业有限责任公司 | Automobile thick-wall automobile logo and injection molding process |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2000135727A (en) * | 1998-11-02 | 2000-05-16 | Ricoh Co Ltd | Injection molding method and injection molding die |
| CN102205594A (en) * | 2011-05-11 | 2011-10-05 | 慈溪市盛艺模具有限公司 | Steam type highlight and traceless injection-molding and forming process for complex precise product |
| CN102785338A (en) * | 2012-08-21 | 2012-11-21 | 青岛海信模具有限公司 | Highlight injection mould heating and cooling device and heating and cooling method thereof |
| CN103538201A (en) * | 2012-07-17 | 2014-01-29 | 贵州华昌群建模塑有限公司 | Assisting type steam highlight traceless injection moulding process of front housing of large-size LED (Light Emitting Diode) television |
-
2016
- 2016-03-11 CN CN201610137623.2A patent/CN105666780A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2000135727A (en) * | 1998-11-02 | 2000-05-16 | Ricoh Co Ltd | Injection molding method and injection molding die |
| CN102205594A (en) * | 2011-05-11 | 2011-10-05 | 慈溪市盛艺模具有限公司 | Steam type highlight and traceless injection-molding and forming process for complex precise product |
| CN103538201A (en) * | 2012-07-17 | 2014-01-29 | 贵州华昌群建模塑有限公司 | Assisting type steam highlight traceless injection moulding process of front housing of large-size LED (Light Emitting Diode) television |
| CN102785338A (en) * | 2012-08-21 | 2012-11-21 | 青岛海信模具有限公司 | Highlight injection mould heating and cooling device and heating and cooling method thereof |
Non-Patent Citations (1)
| Title |
|---|
| 王小新: "快速热循环高光注塑模具加热冷却方法与产品质量控制技术研究", 《中国博士学位论文全文数据库 工程科技I辑》 * |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106671347A (en) * | 2017-01-10 | 2017-05-17 | 佛山市顺德区百年科技有限公司 | Injection molding method and plastic part |
| CN107477265A (en) * | 2017-09-08 | 2017-12-15 | 康泰塑胶科技集团有限公司 | A kind of heavy caliber reinforcement tubing and preparation method thereof |
| CN108688114A (en) * | 2018-06-12 | 2018-10-23 | 浙江工业大学 | It is a kind of quickly to become mould temperature injection molding forming method and its former |
| CN108688114B (en) * | 2018-06-12 | 2023-09-12 | 浙江工业大学 | Quick temperature-changing injection molding method and molding equipment thereof |
| CN111086153A (en) * | 2020-03-25 | 2020-05-01 | 宁波四维尔工业有限责任公司 | Automobile thick-wall automobile logo and injection molding process |
| CN111086153B (en) * | 2020-03-25 | 2020-08-28 | 宁波四维尔工业有限责任公司 | Automobile thick-wall automobile logo and injection molding process |
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Application publication date: 20160615 |