CN111716623A - Injection molding method of hollow ultrathin-wall plastic profile - Google Patents
Injection molding method of hollow ultrathin-wall plastic profile Download PDFInfo
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- CN111716623A CN111716623A CN202010416624.7A CN202010416624A CN111716623A CN 111716623 A CN111716623 A CN 111716623A CN 202010416624 A CN202010416624 A CN 202010416624A CN 111716623 A CN111716623 A CN 111716623A
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- 238000001746 injection moulding Methods 0.000 title claims abstract description 25
- 239000007788 liquid Substances 0.000 claims abstract description 76
- 239000000155 melt Substances 0.000 claims abstract description 20
- 230000001788 irregular Effects 0.000 claims abstract description 17
- 239000012768 molten material Substances 0.000 claims description 28
- 238000003825 pressing Methods 0.000 claims description 20
- 238000002955 isolation Methods 0.000 claims description 11
- 238000002156 mixing Methods 0.000 claims description 8
- 238000002347 injection Methods 0.000 claims description 7
- 239000007924 injection Substances 0.000 claims description 7
- 239000006249 magnetic particle Substances 0.000 claims description 7
- 238000000034 method Methods 0.000 claims description 7
- 239000000463 material Substances 0.000 claims description 5
- 238000007789 sealing Methods 0.000 claims description 5
- 238000012546 transfer Methods 0.000 claims description 5
- WRIDQFICGBMAFQ-UHFFFAOYSA-N (E)-8-Octadecenoic acid Natural products CCCCCCCCCC=CCCCCCCC(O)=O WRIDQFICGBMAFQ-UHFFFAOYSA-N 0.000 claims description 4
- LQJBNNIYVWPHFW-UHFFFAOYSA-N 20:1omega9c fatty acid Natural products CCCCCCCCCCC=CCCCCCCCC(O)=O LQJBNNIYVWPHFW-UHFFFAOYSA-N 0.000 claims description 4
- QSBYPNXLFMSGKH-UHFFFAOYSA-N 9-Heptadecensaeure Natural products CCCCCCCC=CCCCCCCCC(O)=O QSBYPNXLFMSGKH-UHFFFAOYSA-N 0.000 claims description 4
- ZQPPMHVWECSIRJ-UHFFFAOYSA-N Oleic acid Natural products CCCCCCCCC=CCCCCCCCC(O)=O ZQPPMHVWECSIRJ-UHFFFAOYSA-N 0.000 claims description 4
- 239000005642 Oleic acid Substances 0.000 claims description 4
- 238000013461 design Methods 0.000 claims description 4
- QXJSBBXBKPUZAA-UHFFFAOYSA-N isooleic acid Natural products CCCCCCCC=CCCCCCCCCC(O)=O QXJSBBXBKPUZAA-UHFFFAOYSA-N 0.000 claims description 4
- 239000003921 oil Substances 0.000 claims description 4
- ZQPPMHVWECSIRJ-KTKRTIGZSA-N oleic acid Chemical compound CCCCCCCC\C=C/CCCCCCCC(O)=O ZQPPMHVWECSIRJ-KTKRTIGZSA-N 0.000 claims description 4
- 239000003960 organic solvent Substances 0.000 claims description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 4
- 238000005520 cutting process Methods 0.000 claims description 3
- 238000007599 discharging Methods 0.000 claims description 3
- 238000004321 preservation Methods 0.000 claims description 2
- 230000006835 compression Effects 0.000 claims 2
- 238000007906 compression Methods 0.000 claims 2
- 238000000465 moulding Methods 0.000 abstract description 11
- 230000005389 magnetism Effects 0.000 description 13
- 238000007493 shaping process Methods 0.000 description 6
- 238000013459 approach Methods 0.000 description 3
- 125000004122 cyclic group Chemical group 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000012530 fluid Substances 0.000 description 2
- 238000001802 infusion Methods 0.000 description 2
- 239000012774 insulation material Substances 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 239000002002 slurry Substances 0.000 description 2
- 239000003086 colorant Substances 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000009977 dual effect Effects 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 238000004064 recycling Methods 0.000 description 1
- 229920006395 saturated elastomer Polymers 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
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Classifications
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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
-
- 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
- B29C45/2669—Moulds with means for removing excess material, e.g. with overflow cavities
-
- 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
- B29C2045/2683—Plurality of independent mould cavities in a single mould
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- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Mechanical Engineering (AREA)
- Moulds For Moulding Plastics Or The Like (AREA)
Abstract
The invention discloses an injection molding method of a hollow ultrathin-wall plastic profile, belonging to the technical field of hollow ultrathin-wall profile molding, wherein an excessive melt is injected into an inner cavity of a double-cavity molding die, then a magnetic conduction liquid is injected into a conductive magnetic bag, and under the change of a power-on current, the magnetic conduction liquid generates irregular rapid flow in the conductive magnetic bag, so that the conductive magnetic bag generates a series of irregular shape changes, the fluidity of the melt in the inner cavity is greatly improved due to the shape change of the conductive magnetic bag, and the excessive melt is gradually overflowed under the dynamic condition of continuous flow until the melt in the inner cavity forms a profile shape Dishing, internal voids, and the like.
Description
Technical Field
The invention relates to the technical field of hollow thin-wall section molding, in particular to an injection molding method of a hollow ultrathin-wall plastic section.
Background
Injection molding, also known as injection molding, is a method of molding by injection and molding. The injection molding method has the advantages of high production speed, high efficiency, automation of operation, various colors, various shapes from simple to complex, small sizes, accurate product size, easy replacement of products, capability of forming products with complex shapes, and suitability for the molding processing fields of mass production, products with complex shapes and the like.
In the injection moulding process of the hollow ultrathin-wall plastic profile, because of the special thin-wall structure of the profile, a mould cavity is narrow, the flowability of the molten material in the narrow mould cavity can be greatly weakened, the molten material is easily insufficiently filled in the process of injecting the mould cavity, and the whole mould cavity is difficult to be completely filled, so that the molded profile is easy to have the defects of slurry shortage, depression, internal holes and the like.
Disclosure of Invention
1. Technical problem to be solved
The invention aims to provide an injection molding method of a hollow ultrathin-wall plastic section, which aims to solve the problems in the prior art, and aims to provide an injection molding method of a hollow ultrathin-wall plastic section.
2. Technical scheme
In order to solve the above problems, the present invention adopts the following technical solutions.
An injection molding method of a hollow ultrathin-wall plastic profile comprises the following steps:
s1, injecting the melt into the inner cavity of the double-cavity forming die by adopting proper conveying equipment, wherein the injection amount of the melt is required to exceed the melt amount required by section forming;
s2, slowly injecting magnetic conductive liquid into the conductive magnetic bag, electrifying the conductive magnetic bag, and continuously changing the intensity of the electrified current to ensure that the injected magnetic conductive liquid flows irregularly and rapidly in the conductive magnetic bag, so that the conductive magnetic bag expands slowly and has a series of irregular shape changes;
s3, under the shape change of the conductive magnetic bag, the fluidity of the melt in the inner cavity is increased, and in the continuous flowing process, the excessive melt gradually overflows to the outer cavity of the double-cavity forming mold;
and S4, when the conductive magnetic bag gradually expands to the maximum initial shape, stopping injecting the magnetic conductive liquid and cutting off the power current, starting the pressing device, waiting for the molten material in the inner cavity to be cooled and molded and then taken out, and discharging the molten material in the outer cavity back to the molten material pool for reuse.
The invention injects excessive molten material into the inner cavity of the double-cavity forming die, and then injects magnetic conduction liquid into the conductive magnetic bag, under the change of electrified current, the magnetic conduction liquid generates irregular rapid flow in the conductive magnetic bag, so that the conductive magnetic bag generates a series of irregular shape changes, the fluidity of the molten material in the inner cavity is greatly improved due to the shape changes of the conductive magnetic bag, and the excessive molten material gradually overflows under the dynamic condition of continuous flow until the molten material in the inner cavity forms the shape of the section bar.
Further, two-chamber forming die includes interior casing, the outer end fixedly connected with base and the shell body of interior casing, the base is located the downside of shell body, electrically conductive magnetic bag is located the inboard of interior casing, and the space between interior casing and the electrically conductive magnetic bag is as the inner chamber, and the space between interior casing and the shell body is as the exocoel, electrically conductive magnetic bag is including the dress liquid bag, the upper end fixedly connected with area of dress liquid bag has the transfer line of valve, pours into magnetic conduction liquid into in to the dress liquid bag through the transfer line.
Further, dress liquid bag is including the design bag body, the internal surface fixedly connected with a plurality of evenly distributed's of the design bag body electro-magnet, electro-magnet have magnetism when the circular telegram, and the magnetism just disappears along with it after the outage, and magnetism is directly proportional with the circular telegram current, the isolation layer is scribbled to the surface of electro-magnet, the isolation layer adopts high temperature resistant adiabatic heat preservation material, makes the difficult influence that receives the melt temperature variation of dress liquid bag through the isolation layer.
Furthermore, the magnetic conduction liquid is formed by mixing filling liquid and magnetic particles, the filling liquid is formed by mixing water, an organic solvent, oil, oleic acid and the like, when the electromagnet is electrified to generate magnetism, the magnetic particles can approach the electromagnet under the action of magnetic force, so that the magnetic conduction liquid flows towards the electromagnet, and the magnetic conduction liquid generates irregular rapid flow by continuously changing the current intensity of the electromagnet at different positions, so that the liquid containing bag generates irregular shape change.
Furthermore, the pressing device comprises a hollow pressing plate positioned on the inner side of the outer shell, the hollow pressing plate is positioned on the upper side of the inner shell, the outer end of the hollow pressing plate is fixedly connected with a plurality of uniformly distributed limiting plates, the upper end of the outer shell is provided with a plurality of uniformly distributed limiting grooves, the limiting plates are connected inside the limiting grooves in a sliding manner, the hollow pressing plate can stably move up and down through the matching of the limiting plates and the limiting grooves, the pressing device also comprises a pair of cylinders fixedly connected with the outer end of the base, the output end of each cylinder is fixedly connected with an elastic ring belt, the elastic ring belts are respectively sleeved on the outer sides of the pair of limiting plates, the limiting plates and the hollow pressing plate are driven by the cylinders and the elastic ring belts to move down and tightly press the upper end of the inner shell, so that the molten material can be smoothly formed, and after, can take out cavity pressfitting board from the shell body to make things convenient for taking out of section bar, cylinder and electro-magnet all with outside treater electric connection, through the start-up of outside treater control cylinder and the power of electro-magnet circular telegram electric current.
Further, a plurality of evenly distributed's air vent has been seted up on the cavity pressfitting board, and is a plurality of the circle that the air vent is constituteed is located between interior casing and the shell body, can make things convenient for the circulation of air between the shell body is inside and the external world through the air vent to make things convenient for the injection and the flow of melt.
Further, the lower extreme fixedly connected with of shell body and the inside communicating row of shell body expect the pipe, conveniently discharge excessive melt in the shell body to the melt pond in through arranging the material pipe and carry out cyclic utilization.
Further, the inner wall fixedly connected with driving fit frame of interior casing, the inner circle size of driving fit frame, the inner circle size of cavity pressfitting board and the biggest outer lane size three size of dress liquid bag are the same, because of there is the remaining possibility of melt between the interior bottom surface of dress liquid bag bottom and interior casing, through the seamless surface contact between driving fit frame and the dress liquid bag outer lane, blocks the dress liquid bag bottom and remains being connected between melt and the section bar, makes the section bar more complete.
Furthermore, the upper end face of the inner shell and the inner bottom face of the limiting groove are located on the same horizontal plane, so that the lower end of the hollow press-fit plate can be seamlessly pressed on the upper end of the inner shell, and the upper end of the section can be smoothly formed.
3. Advantageous effects
Compared with the prior art, the invention has the advantages that:
(1) according to the scheme, excessive molten materials are injected into the inner cavity of the double-cavity forming die, then the conductive magnetic liquid is injected into the conductive magnetic bag, the conductive magnetic liquid flows in the conductive magnetic bag at irregular rapid speed under the change of the electrified current, so that the conductive magnetic bag generates a series of irregular shape changes, the flowability of the molten materials in the inner cavity is greatly improved due to the shape changes of the conductive magnetic bag, excessive molten materials gradually overflow under the dynamic condition of continuous flowing until the molten materials in the inner cavity form the shape of the profile, the invention innovatively adopts an injection molding mode that the molten materials overflow in a saturated mode under the dynamic condition, so that the molten materials are fully and compactly filled in the whole cavity, and the conditions of defects of slurry shortage, depression, internal holes and the like of the profile are greatly reduced.
(2) Two-chamber forming die includes interior casing, the outer end fixedly connected with base and the shell body of interior casing, the base is located the downside of shell body, electrically conductive magnetism bag is located the inboard of interior casing, the inner chamber is regarded as in the space between interior casing and the electrically conductive magnetism bag, the space between interior casing and the shell body is regarded as the exocoel, electrically conductive magnetism bag is including the dress liquid bag, the upper end fixedly connected with area of dress liquid bag has the transfer line of valve, pour into magnetic conduction liquid into in to the dress liquid bag through the transfer line.
(3) The liquid containing bag comprises a shaping bag body, wherein a plurality of uniformly distributed electromagnets are fixedly connected to the inner surface of the shaping bag body, the electromagnets are magnetic when powered on, the magnetism disappears along with the power off, the magnetism is in direct proportion to the power on current, an isolation layer is coated on the outer surface of each electromagnet, the isolation layer is made of high-temperature-resistant heat-insulation materials, and the liquid containing bag is not easily influenced by the temperature change of the molten material through the isolation layer.
(4) The magnetic conduction liquid is prepared by mixing filling liquid and magnetic particles, the filling liquid is prepared by mixing water, an organic solvent, oil, oleic acid and the like, when the electromagnet is electrified to generate magnetism, the magnetic particles can approach the electromagnet under the action of magnetic force, so that the magnetic conduction liquid flows towards the electromagnet, and the magnetic conduction liquid generates irregular rapid flow by continuously changing the current intensity of the electromagnet at different positions, so that the liquid containing bag generates irregular shape change.
(5) Drive limiting plate and hollow compressed particleboard downstream through cylinder and elastic ring area, compress tightly the upper end of casing including, make the melt can level and smooth the shaping, after the shaping, take off elastic ring area from the limiting plate, can take out hollow compressed particleboard from the shell body to make things convenient for taking out of section bar, cylinder and electro-magnet all with external processor electric connection, through the start-up of external processor control cylinder and the power of electro-magnet circular telegram electric current weak.
(6) The air vent that has seted up a plurality of evenly distributed on the cavity pressfitting board, the circle shape circle that a plurality of air vents are constituteed is located between interior casing and the shell body, can make things convenient for the circulation of air between the shell body is inside and the external world through the air vent to make things convenient for the injection and the flow of melt.
(7) The lower extreme fixedly connected with of shell body and the inside communicating row of shell body expect the pipe, conveniently discharge excessive melt in the shell body to the melt pond in through arranging the material pipe and carry out cyclic utilization.
(8) The inner wall fixedly connected with driving fit frame of interior casing, the inner circle size of driving fit frame, the inner circle size of cavity pressfitting board and the biggest outer lane size three size of dress liquid bag are the same, because of there is the remaining possibility of melt between the interior bottom surface of dress liquid bag bottom and interior casing, through the seamless face contact between driving fit frame and the dress liquid bag outer lane, blocks the dress liquid bag bottom and remains being connected between melt and the section bar, makes the section bar more complete.
(9) The upper end face of the inner shell and the inner bottom face of the limiting groove are located on the same horizontal plane, so that the lower end of the hollow press-fit plate can be seamlessly pressed on the upper end of the inner shell, and the upper end of the section can be smoothly formed.
Drawings
FIG. 1 is a block flow diagram of the present invention;
FIG. 2 is a perspective view of a dual cavity molding die of the present invention;
FIG. 3 is a schematic front view of the dual-cavity molding die of the present invention during use;
FIG. 4 is a horizontal cross-sectional view of a fluid-containing bag of the present invention;
FIG. 5 is a vertical cross-sectional view of a fluid-containing bag of the present invention;
fig. 6 is a perspective view of the hollow laminate panel of the present invention;
FIG. 7 is a schematic front view of the dual-cavity molding mold of the present invention during use;
FIG. 8 is a schematic front view of the double cavity molding die of the present invention during use;
fig. 9 is a schematic front view of the dual-cavity molding die of the present invention during use.
The reference numbers in the figures illustrate:
1 base, 2 inner shells, 3 outer shells, 301 limiting groove, 4 liquid bags, 401 shaped bag bodies, 402 electromagnets, 403 isolating layers, 5 infusion tubes, 6 hollow press plates, 601 vent holes, 7 limiting plates, 8 cylinders, 9 elastic annular belts, 10 discharge tubes and 11 sealing frames.
Detailed Description
The drawings in the embodiments of the invention will be combined; the technical scheme in the embodiment of the invention is clearly and completely described; obviously; the described embodiments are only some of the embodiments of the invention; but not all embodiments, are based on the embodiments of the invention; all other embodiments obtained by a person skilled in the art without making any inventive step; all fall within the scope of protection of the present invention.
In the description of the present invention, it should be noted that the terms "upper", "lower", "inner", "outer", "top/bottom", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplification of description, but do not indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and thus should not be construed as limiting the present invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "disposed," "sleeved/connected," "connected," and the like are to be construed broadly, e.g., "connected," which may be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
Example (b):
referring to fig. 1, a method for injection molding of a hollow ultra-thin wall plastic profile includes the following steps:
s1, injecting the melt into the inner cavity of the double-cavity forming die by adopting proper conveying equipment, wherein the injection amount of the melt is required to exceed the melt amount required by section forming;
s2, slowly injecting magnetic conductive liquid into the conductive magnetic bag, electrifying the conductive magnetic bag, and continuously changing the intensity of the electrified current to ensure that the injected magnetic conductive liquid flows irregularly and rapidly in the conductive magnetic bag, so that the conductive magnetic bag expands slowly and has a series of irregular shape changes;
s3, under the shape change of the conductive magnetic bag, the fluidity of the melt in the inner cavity is increased, and in the continuous flowing process, the excessive melt gradually overflows to the outer cavity of the double-cavity forming mold;
and S4, when the conductive magnetic bag gradually expands to the maximum initial shape, stopping injecting the magnetic conductive liquid and cutting off the power current, starting the pressing device, waiting for the molten material in the inner cavity to be cooled and molded and then taken out, and discharging the molten material in the outer cavity back to the molten material pool for reuse.
Please refer to fig. 2 and fig. 3, the double-cavity forming mold comprises an inner shell 2, the outer end of the inner shell 2 is fixedly connected with a base 1 and an outer shell 3, the base 1 is located at the lower side of the outer shell 3, a conductive magnetic bag is located at the inner side of the inner shell 2, a gap between the inner shell 2 and the conductive magnetic bag is used as an inner cavity, a gap between the inner shell 2 and the outer shell 3 is used as an outer cavity, the conductive magnetic bag comprises a liquid containing bag 4, an infusion tube 5 with a valve is fixedly connected at the upper end of the liquid containing bag 4, and magnetic conductive liquid is injected into the liquid containing.
Referring to fig. 4 and 5, the liquid bag 4 includes a shaped bag body 401, the inner surface of the shaped bag body 401 is fixedly connected with a plurality of uniformly distributed electromagnets 402, the electromagnets 402 are magnetic when being powered on, the magnetism disappears when the power is off, the magnetism is in direct proportion to the power current, the outer surface of the electromagnets 402 is coated with an isolation layer 403, the isolation layer 403 is made of high temperature resistant heat insulation material, the liquid bag 4 is not easily affected by the temperature change of the melting material through the isolation layer 403, the magnetic conductive liquid is prepared by mixing filling liquid and magnetic particles, the filling liquid is prepared by mixing water, organic solvent, oil, oleic acid and the like, when the electromagnets 402 are powered on to generate magnetism, the magnetic particles approach the electromagnets 402 under the effect of the magnetic force, so that the magnetic conductive liquid flows towards the electromagnets 402, and the magnetic conductive liquid generates irregular rapid flow by changing the current intensity of the electromagnets 402 at different positions continuously, thereby causing irregular shape changes of the liquid-containing pouch 4.
Referring to fig. 1 and 6, the pressing device includes a hollow pressing plate 6 located inside an outer casing 3, the hollow pressing plate 6 is located on the upper side of an inner casing 2, the hollow pressing plate 6 is located on the outer side of a liquid bag 4, the outer end of the hollow pressing plate 6 is fixedly connected with a plurality of evenly distributed limiting plates 7, the upper end of the outer casing 3 is provided with a plurality of evenly distributed limiting grooves 301, the limiting plates 7 are slidably connected inside the limiting grooves 301, the hollow pressing plate 6 can stably move up and down by the cooperation of the limiting plates 7 and the limiting grooves 301, the pressing device further includes a pair of cylinders 8 fixedly connected with the outer end of the base 1, the output ends of the cylinders 8 are fixedly connected with elastic belts 9, the pair of elastic belts 9 are respectively sleeved outside the pair of limiting plates 7, the limiting plates 7 and the hollow pressing plate 6 are driven by the cylinders 8 and the elastic belts 9 to move down to press the upper, make the melt can level and smooth the shaping, after the shaping, take off elastic ring 9 from limiting plate 7, can take out cavity pressfitting board 6 from shell body 3 to make things convenient for taking out of section bar, cylinder 8 and electro-magnet 402 all with external processor electric connection, through the start-up of external processor control cylinder 8 and the intensity of electro-magnet 402 circular telegram electric current.
Referring to fig. 6 and 7, a plurality of vent holes 601 are uniformly distributed on the hollow pressed board 6, a loop formed by the vent holes 601 is located between the inner housing 2 and the outer housing 3, and the vent holes 601 can facilitate air circulation between the inside of the outer housing 3 and the outside, thereby facilitating injection and flow of molten material, the upper end surface of the inner housing 2 and the inner bottom surface of the limiting groove 301 are located on the same horizontal plane, so that the lower end of the hollow pressed board 6 can be seamlessly compressed on the upper end of the inner housing 2, and the upper end of the profile can be smoothly formed.
Referring to fig. 7, a discharge pipe 10 is fixedly connected to a lower end of the outer casing 3 and is communicated with an interior of the outer casing 3, and the excess melt in the outer casing 3 is conveniently discharged to a melt pool through the discharge pipe 10 for recycling.
Referring to fig. 7 and 8, the inner wall of the inner housing 2 is fixedly connected with the sealing frame 11, the size of the inner ring of the hollow pressing plate 6 and the maximum outer ring of the liquid containing bag 4 are the same, and because the possibility of residual melt exists between the bottom of the liquid containing bag 4 and the inner bottom surface of the inner housing 2, the connection between the residual melt at the bottom of the liquid containing bag 4 and the section bar is blocked through the seamless surface contact between the sealing frame 11 and the outer ring of the liquid containing bag 4, so that the section bar is more complete; when the liquid containing bag 4 expands to the limit, the gap between the liquid containing bag 4 and the inner shell 2 is the section forming cavity.
The invention injects excessive molten material into the inner cavity of the double-cavity forming die, and then injects magnetic conduction liquid into the conductive magnetic bag, under the change of electrified current, the magnetic conduction liquid generates irregular rapid flow in the conductive magnetic bag, so that the conductive magnetic bag generates a series of irregular shape changes, the fluidity of the molten material in the inner cavity is greatly improved due to the shape changes of the conductive magnetic bag, and the excessive molten material gradually overflows under the dynamic condition of continuous flow until the molten material in the inner cavity forms the shape of the section bar.
The above; but are merely preferred embodiments of the invention; the scope of the invention is not limited thereto; any person skilled in the art is within the technical scope of the present disclosure; the technical scheme and the improved concept of the invention are equally replaced or changed; are intended to be covered by the scope of the present invention.
Claims (9)
1. An injection molding method of a hollow ultrathin-wall plastic profile is characterized by comprising the following steps: the method comprises the following steps:
s1, injecting the melt into the inner cavity of the double-cavity forming die by adopting proper conveying equipment, wherein the injection amount of the melt is required to exceed the melt amount required by section forming;
s2, slowly injecting magnetic conductive liquid into the conductive magnetic bag, electrifying the conductive magnetic bag, and continuously changing the intensity of the electrified current to ensure that the injected magnetic conductive liquid flows irregularly and rapidly in the conductive magnetic bag, so that the conductive magnetic bag expands slowly and has a series of irregular shape changes;
s3, under the shape change of the conductive magnetic bag, the fluidity of the melt in the inner cavity is increased, and in the continuous flowing process, the excessive melt gradually overflows to the outer cavity of the double-cavity forming mold;
and S4, when the conductive magnetic bag gradually expands to the maximum initial shape, stopping injecting the magnetic conductive liquid and cutting off the power current, starting the pressing device, waiting for the molten material in the inner cavity to be cooled and molded and then taken out, and discharging the molten material in the outer cavity back to the molten material pool for reuse.
2. The injection molding method of the hollow ultra-thin wall plastic profile according to claim 1, characterized in that: two-chamber forming die includes interior casing (2), the outer end fixedly connected with base (1) and shell body (3) of interior casing (2), base (1) is located the downside of shell body (3), electrically conductive magnetic bag is located the inboard of interior casing (2), electrically conductive magnetic bag is including dress liquid bag (4), the upper end fixedly connected with area of dress liquid bag (4) has transfer line (5) of valve.
3. The injection molding method of the hollow ultra-thin wall plastic profile according to claim 2, characterized in that: dress liquid bag (4) is including the design bag body (401), the internal surface fixedly connected with a plurality of evenly distributed's of the design bag body (401) electro-magnet (402), isolation layer (403) are scribbled to the surface of electro-magnet (402), isolation layer (403) adopt high temperature resistant adiabatic heat preservation material.
4. The injection molding method of the hollow ultra-thin wall plastic profile according to claim 1, characterized in that: the magnetic conduction liquid is prepared by mixing filling liquid and magnetic particles, and the filling liquid is prepared by mixing water, an organic solvent, oil, oleic acid and the like.
5. The injection molding method of the hollow ultra-thin wall plastic profile according to claim 2, characterized in that: compression fittings is including being located inboard cavity pressfitting board (6) of shell body (3), cavity pressfitting board (6) is located the upside of interior casing (2), the limiting plate (7) of a plurality of evenly distributed of outer end fixedly connected with of cavity pressfitting board (6), a plurality of evenly distributed's spacing groove (301) have been seted up to the upper end of shell body (3), limiting plate (7) sliding connection is in the inside of spacing groove (301), compression fittings still include a pair of cylinder (8) with base (1) outer end fixed connection, the output fixedly connected with elasticity clitellum (9) of cylinder (8), it is a pair of elasticity clitellum (9) overlap respectively in the outside of a pair of limiting plate (7), cylinder (8) and electro-magnet (402) all with external treatment ware electric connection.
6. The injection molding method of the hollow ultrathin-wall plastic profile as claimed in claim 5, wherein the injection molding method comprises the following steps: a plurality of evenly distributed vent holes (601) are formed in the hollow laminated board (6), and a plurality of circular rings formed by the vent holes (601) are located between the inner shell (2) and the outer shell (3).
7. The injection molding method of the hollow ultra-thin wall plastic profile according to claim 1, characterized in that: the lower end of the outer shell (3) is fixedly connected with a discharge pipe (10) communicated with the inside of the outer shell (3).
8. The injection molding method of the hollow ultrathin-wall plastic profile as claimed in claim 5, wherein the injection molding method comprises the following steps: the inner wall of the inner shell (2) is fixedly connected with a sealing frame (11), and the size of the inner ring of the sealing frame (11), the size of the inner ring of the hollow pressing plate (6) and the size of the maximum outer ring of the liquid filling bag (4) are the same.
9. The injection molding method of the hollow ultrathin-wall plastic profile as claimed in claim 5, wherein the injection molding method comprises the following steps: the upper end surface of the inner shell (2) and the inner bottom surface of the limiting groove (301) are located on the same horizontal plane.
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