CN114161674A - Intelligent injection mold is used in production based on foaming polypropylene material - Google Patents

Intelligent injection mold is used in production based on foaming polypropylene material Download PDF

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Publication number
CN114161674A
CN114161674A CN202111476928.3A CN202111476928A CN114161674A CN 114161674 A CN114161674 A CN 114161674A CN 202111476928 A CN202111476928 A CN 202111476928A CN 114161674 A CN114161674 A CN 114161674A
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threaded rod
materials
unit
injection
intelligent
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CN202111476928.3A
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关勇
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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
    • B29C45/17—Component parts, details or accessories; Auxiliary operations
    • B29C45/46—Means for plasticising or homogenising the moulding material or forcing it into the mould
    • B29C45/58—Details
    • B29C45/60—Screws
    • 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
    • B29C45/1742—Mounting of moulds; Mould supports
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
    • B29C45/17—Component parts, details or accessories; Auxiliary operations
    • B29C45/46—Means for plasticising or homogenising the moulding material or forcing it into the mould
    • B29C45/58—Details
    • B29C45/62—Barrels or cylinders
    • 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
    • B29C45/74—Heating or cooling of the injection unit

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  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Mechanical Engineering (AREA)
  • Injection Moulding Of Plastics Or The Like (AREA)

Abstract

The invention discloses an intelligent injection mold for production based on a foamed polypropylene material, which comprises a lower mold base, an upper mold base and an intelligent injection system, wherein a hydraulic motor is installed at the top of the upper mold base, a feed inlet is formed in the top of the upper mold base, the feed inlet is uniformly distributed on the side surface of the hydraulic motor, a pumping oil cylinder is uniformly installed on the side edge of the bottom of the upper mold base, a charging barrel is uniformly installed in the middle area of the bottom of the upper mold base, an injection oil seat is fixedly installed at the bottom of the pumping oil cylinder, the charging barrel penetrates through the injection oil seat, a mold groove is formed in the top of the lower mold base, a fixing column is fixedly installed on the side edge of the top of the lower mold base, the charging barrel comprises a threaded rod, a threaded head is installed at the bottom of the threaded rod, a nozzle is installed at the bottom of the threaded head, a heating ring is installed on the inner wall of the charging barrel, and a cooling water ring is installed at the top of the charging barrel, the invention has the characteristics of strong practicability and avoidance of frequent replacement of the threaded rod.

Description

Intelligent injection mold is used in production based on foaming polypropylene material
Technical Field
The invention relates to the technical field of automation, in particular to an intelligent injection mold for production based on a foamed polypropylene material.
Background
An injection molding machine, also known as an injection molding machine or an injection machine, is a main molding device for manufacturing thermoplastic plastics or thermosetting plastics into plastic products with various shapes by utilizing a plastic molding die, and is divided into a vertical type, a horizontal type and an all-electric type, wherein the injection molding machine can heat the plastics and apply high pressure to the molten plastics to ensure that the molten plastics are injected to fill a die cavity of the die.
Disclosure of Invention
The invention aims to provide an intelligent injection mold for production based on a foamed polypropylene material, so as to solve the problems in the background technology.
In order to solve the technical problems, the invention provides the following technical scheme: intelligent injection mold is used in production based on expanded polypropylene material, including die holder, upper die base and intelligent injection molding system, its characterized in that: the injection molding die comprises an upper die base, a lower die base, a die holder, a hydraulic motor, a feeding port, a pumping oil cylinder, an injection column, an injection oil seat, a fixing column and a fixing column.
According to the technical scheme, the material injection cylinder comprises a threaded rod, the bottom of the threaded rod is provided with a threaded head, the bottom of the threaded head is provided with a nozzle, the inner wall of the material injection cylinder is provided with a heating ring, the top of the material injection cylinder is provided with a cooling water ring, sliding plates are uniformly distributed in a threaded groove of the threaded rod, a groove is formed in the threaded groove of the threaded rod, an air cavity is formed in the groove and is close to the bottom wall below the groove, the bottom of each sliding plate is fixedly provided with a push rod, the push rod is in sliding connection with the air cavity in a sealing mode, and a pressure sensor is installed in the air cavity.
According to the technical scheme, the intelligent injection molding system comprises a mold closing module, an injection material module and an auxiliary driving module, the mold closing module comprises an ejection unit and a mold adjusting unit, the injection material module comprises an intelligent start-stop unit, a threaded rod adjusting unit and a pumping pressure oil cylinder unit, and the auxiliary driving module comprises a heating unit, a cooling unit, a process control unit and a fault protection unit.
According to the technical scheme, the ejection unit is used for smoothly demolding cooled and molded products, the die adjusting unit is used for adjusting the position of the upper die base to be matched with the position of a die groove of the lower die base, the intelligent start-stop unit is used for monitoring the situation of the feeding port in real time and automatically controlling the start and stop of the threaded rod, the threaded rod adjusting unit is used for adjusting the rotating speed and the rotating direction of the threaded rod, the pumping oil cylinder unit is used for adjusting the propelling force of the threaded rod, the heating unit is used for adjusting the heating temperature, the cooling unit is used for adjusting the reduction range of the temperature in real time, the flow monitoring unit is used for comprehensively planning the sequence of each step, and the fault protection unit is used for protecting devices and operators.
According to the technical scheme, the operation flow of the intelligent injection molding machine is as follows:
s1, adding a material into a material injection barrel from a feed inlet;
s2, starting to act and heat a heating ring in the material injection barrel to melt the material;
s3, starting a hydraulic motor, driving a threaded rod to rotate by the hydraulic motor, conveying materials along the direction of a screw groove on the threaded rod, and shearing the materials by the threaded rod;
s4, conveying the material to the screw thread head, pushing the threaded rod by the material through reaction along with accumulation of the material, and forming a material storage space at the screw thread head;
s5, starting a pump pressure oil cylinder, and pushing and injecting the materials accumulated at the thread head into a mold;
s6, pressurizing the mold injected with the material;
s7, cooling the mold;
and S8, ejecting the shaped product out of the mold through an ejection device.
According to the technical scheme, the specific operation steps of starting plasticizing of the charging barrel are as follows:
s21, when pre-molding, inputting materials into the material injection barrel, when the materials pass through the material inlet, transmitting signals to the intelligent starting and stopping unit by a displacement sensor on the wall of the material inlet, receiving instructions by the intelligent starting and stopping unit to drive the threaded rod to rotate, when the materials are not added at the material inlet, transmitting an instruction for prolonging 1min by the intelligent starting and stopping unit, and automatically stopping the operation of the threaded rod after 1 min;
s22, starting the intelligent start-stop unit and the heating unit with time difference, and operating the heating ring after the threaded rod rotates for 1 min;
s23, material size and viscosity are distinguished, the rotating force of a threaded rod is controlled according to different characteristics of different materials, the viscosity of a solution of the materials after melting is changed from small to large, the thrust applied to a sliding plate is changed from small to large in real time, the threaded rod rotates to push molten liquid, the molten liquid is conveyed through a threaded groove in the threaded rod, the sliding plate is pushed in the conveying process, the sliding plate drives a push rod to move, the push rod moves in an air cavity, along with the movement of the push rod, the air pressure in the air cavity is gradually increased, a pressure sensor monitors in real time, the monitored value is transmitted to a threaded rod adjusting unit, and the threaded rod adjusting unit adjusts the corresponding rotating force according to the obtained data;
s24, the rotating force of the threaded rod is divided into 12 gradients which are T1-T12 respectively, wherein the rotating force of T1 is minimum, the rotating force of T12 is maximum, and the pressure numerical range of each interval corresponds to data measured by a pressure sensor;
s25, plasticizing the fixed material under the dual action of shearing by the heating ring and the threaded rod and through the thermal history of each functional section of the threaded rod, enabling the melted material to completely flow into the threaded head, continuously conveying the external material by the rotation of the threaded rod, generating reverse pressure, and pushing the threaded rod to move reversely to complete metering of the molten material;
s26, when the moving distance of the threaded rod in the direction reaches a numerical value D, the flow control unit transmits a starting instruction to the pumping pressure oil cylinder unit, the pumping pressure oil cylinder unit starts to move forwards, and materials at the threaded head are injected into the mold through the nozzle.
According to the technical scheme, the threaded rod is analyzed in detail as follows:
pre-selecting a corresponding threaded rod;
the threaded rod is conventionally divided into a universal threaded rod and a customized threaded rod, and the universal threaded rod is used for processing materials with low or medium viscosity;
the threaded rod is generally divided into a charging section, a compression section and a metering section;
a universal threaded rod is adopted conventionally, wherein a feeding section L1 occupies 45% -50%, a compression section L2 occupies 20% -30%, and a metering section L3 occupies 20% -30%;
the surface of a threaded groove of the threaded rod in the stage L1 is smooth enough, the length of L1 is enough to ensure the conveying of materials, the situation that the materials are melted too early is avoided, if the materials are melted too early, the whole material conveying system is not stable enough, meanwhile, the plasticizing quality of the threaded rod after melting is difficult to ensure, the quality of the materials melted too early is poor, the product quality is uneven, the materials are preliminarily melted in the stage L1, and then the materials are extruded by the threaded rod, the materials at the moment form a solid-liquid complex, and the threaded groove is filled by the solid-liquid complex;
the heating force of the material in the stage L2 is gradually increased from the entry point to the exit point, the material is completely melted when the exit point is reached, the material is converted into liquid from the solid-liquid complex, the length of L2 can influence the conversion from the solid-liquid complex to the liquid, and if L2 is too short, the material state is not in time to be converted;
the heating degree of the L3 stage is more uniform, the temperature is more uniform, the melt with higher quality is formed, and the melt is uniformly discharged from the nozzle under the help of certain pressure.
According to the technical scheme, the depth of the thread groove of the L1 is h1 ═ 0.12-0.16 d, and the deeper h1 is, the larger the feeding amount is, so that the overall production efficiency of the device is improved;
the length of the L2 is L21 ═ 6-8 d, and the L2 with the length can increase the torque and energy consumption of the threaded rod, so that the threaded rod is suitable for thermosensitive materials;
l22 is (3-4) d, and L2 with the length is suitable for materials with obvious melting points;
the length of L3 is L3 ═ 4-5 d, and the length of L3 is used for stabilizing the pressure in the material injection barrel, so that the material can be uniformly extruded from the nozzle, and the depth of the thread groove h3 at the stage is shallow, so that the plasticizing effect of the melt is improved, and the homogenization of the melt is facilitated;
wherein d is the outer diameter of the threaded rod;
a is h1/h3, A is the compression ratio, the thread groove depth at L1 stage and the thread groove depth at L3 stage, A increases, the shearing effect of the threaded rod is enhanced, A decreases, the plasticizing capacity is enhanced, the numerical value of A is stored in advance by the threaded rod adjusting unit, for materials with obvious melting points, the compression ratio interval is 2.6-3.0, for materials with higher thermal stability, the threaded rod with higher A value is selected, for thermosensitive materials, the threaded rod with lower A value is selected, three sections of the threaded rod can be automatically adjusted in a telescopic mode, the threaded rod adjusting unit achieves the purpose of controlling the threaded rod through the A value, before the materials are poured into the feed inlet, the poured material information needs to be input into the system, the threaded rod adjusting unit automatically adjusts the length of each stage of the threaded rod according to the input information, and the time for replacing the threaded rod is reduced.
According to the technical scheme, the concrete analysis of the charging barrel is as follows:
the space between the threaded rod and the wall of the injection barrel is a barrel gap, a gap v is (0.002-0.005) d, the radius of the injection barrel is adjustable, the threaded rod adjusting unit controls the injection molding quality by adjusting the numerical value of the gap v, the gap v is large, the plasticizing quality is deviated, the injection time is long, the gap v is small, and the material can block the gap to cause the clamping of the threaded rod;
inputting the model of the die into a system, automatically adjusting the outward expansion degree of the nozzle by the system according to the obtained signal, if the size of the die is smaller, reducing the outward expansion angle of the nozzle, and if the size of the die is larger, increasing the outward expansion angle of the nozzle.
According to the technical scheme, the threaded rod has the following characteristics in operation:
the threaded rod has two functions of plasticization and injection;
during the plasticizing process of the threaded rod, the thermal history is long compared to the extrusion time.
Compared with the prior art, the invention has the following beneficial effects: according to the invention, the threaded rod adjusting unit is arranged, so that the situation that the threaded rod is frequently replaced is avoided.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the principles of the invention and not to limit the invention. In the drawings:
FIG. 1 is a schematic overall elevational view of the present invention;
FIG. 2 is a schematic view of the threaded rod of the present invention;
FIG. 3 is a schematic view of the slide plate of the present invention;
FIG. 4 is a schematic diagram of the system of the present invention;
in the figure: 1. a lower die holder; 2. an upper die holder; 3. a hydraulic motor; 4. a pump pressure cylinder; 5. a feed inlet; 6. an injection oil seat; 7. a charging barrel is injected; 8. cooling the water ring; 9. heating a ring; 10. a threaded rod; 11. a mold slot; 12. a screw head; 13. a nozzle; 14. fixing a column; 15. a sliding plate; 16. a push rod; 17. an air cavity.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 1-4, the present invention provides the following technical solutions: the intelligent injection mold for production based on the foamed polypropylene material comprises a lower die holder 1, an upper die holder 2 and an intelligent injection system, wherein a hydraulic motor 3 is installed at the top of the upper die holder 2, a feed inlet 5 is formed in the top of the upper die holder 2, the feed inlet 5 is uniformly distributed on the side face of the hydraulic motor 3, a pumping pressure oil cylinder 4 is uniformly installed on the side edge of the bottom of the upper die holder 2, an injection cylinder 7 is uniformly installed in the middle area of the bottom of the upper die holder 2, an injection oil seat 6 is fixedly installed at the bottom of the pumping pressure oil cylinder 4, the injection cylinder 7 penetrates through the injection oil seat 6, a die groove 11 is formed in the top of the lower die holder 1, and a fixing column 14 is fixedly installed on the side edge of the top of the lower die holder 1;
the injection charging barrel 7 comprises a threaded rod 10, a threaded head 12 is installed at the bottom of the threaded rod 10, a nozzle 13 is installed at the bottom of the threaded head 12, a heating ring 9 is installed on the inner wall of the injection charging barrel 7, a cooling water ring 8 is installed at the top of the injection charging barrel 7, sliding plates 15 are uniformly distributed in a threaded groove of the threaded rod 10, a groove is formed in the threaded groove of the threaded rod 10, an air cavity 17 is installed on the bottom wall close to the lower side in the groove, a push rod 16 is fixedly installed at the bottom of the sliding plate 15, the push rod 16 is in sealing sliding connection with the air cavity 17, and a pressure sensor is installed in the air cavity 17;
the intelligent injection molding system comprises a mold closing module, an injection material module and an auxiliary driving module, wherein the mold closing module comprises an ejection unit and a mold adjusting unit, the injection material module comprises an intelligent start-stop unit, a threaded rod adjusting unit and a pump pressure oil cylinder unit, and the auxiliary driving module comprises a heating unit, a cooling unit, a process control unit and a fault protection unit.
The ejection unit is used for demolding the cooled and formed product smoothly, the mould adjusting unit is used for adjusting the position of the upper die base 2 and the position of the die groove 11 of the adaptation lower die base 1, the intelligent start-stop unit is used for monitoring the situation of the feed inlet 5, the start-stop of the automatic control threaded rod 10, the threaded rod adjusting unit is used for adjusting the rotating speed and the rotating direction of the thread, the pump pressure oil cylinder unit is used for adjusting the propelling force of the threaded rod 10, the heating unit is used for adjusting the heating temperature, the cooling unit is used for adjusting the reduction range of the temperature in real time, the flow monitoring unit is used for overall planning the sequence of each step, and the fault protection unit is used for protecting devices and operating workers.
The operation flow of the intelligent injection molding machine is as follows:
s1, adding a material into a material injection barrel 7 from a feed inlet 5;
s2, heating by a heating ring 9 in the material injection cylinder 7 to melt the material;
s3, starting the hydraulic motor 3, driving the threaded rod 10 to rotate by the hydraulic motor 3, conveying materials along the direction of a screw groove on the threaded rod 10, and shearing the materials by the threaded rod 10;
s4, conveying the material to the threaded head 12, pushing the threaded rod 10 by the material through reaction along with accumulation of the material, and forming a material storage space at the threaded head 12;
s5, starting a pump pressure oil cylinder 4, and pushing and injecting the materials accumulated at the threaded head 12 into a mold;
s6, pressurizing the mold injected with the material;
s7, cooling the mold;
and S8, ejecting the shaped product out of the mold through an ejection device.
The concrete operation steps of the injection cylinder 7 for starting plasticizing are as follows:
s21, during pre-molding, inputting materials into the material injection barrel 7, when the materials pass through the material inlet, transmitting signals to the intelligent starting and stopping unit by a displacement sensor on the wall of the material inlet opening, receiving instructions by the intelligent starting and stopping unit to drive the threaded rod 10 to rotate, when the materials are not added at the material inlet opening, transmitting an instruction for prolonging 1min by the intelligent starting and stopping unit, and automatically stopping the operation of the threaded rod 10 after 1 min;
s22, the intelligent start-stop unit and the heating unit are started with time difference, and the heating ring 9 operates after the threaded rod 10 rotates for 1 min;
s23, material size and viscosity are distinguished, the rotating force of the threaded rod 10 is controlled according to different characteristics of different materials, the viscosity of a solution of the materials after melting is changed from small to large, the thrust applied to the sliding plate 15 is changed from small to large in real time, the threaded rod 10 rotates to push molten liquid, the molten liquid is conveyed through a threaded groove in the threaded rod 10, the sliding plate 15 is pushed in the conveying process, the sliding plate 15 drives the push rod 16 to move, the push rod 16 moves in the air cavity 17, the air pressure in the air cavity 17 is gradually increased along with the movement of the push rod 16, the pressure sensor monitors in real time, the monitored numerical value is transmitted to a threaded rod adjusting unit, and the threaded rod adjusting unit adjusts the corresponding rotating force according to the obtained data;
s24, the rotating force of the threaded rod 10 is divided into 12 gradients which are T1-T12, wherein the rotating force of T1 is minimum, the rotating force of T12 is maximum, and the pressure numerical range of each interval corresponds to data measured by a pressure sensor;
s25, plasticizing the fixed material under the dual action of shearing by the heating ring 9 and the threaded rod 10 and through the thermal history of each functional section of the threaded rod 10, enabling the melted material to completely flow into the threaded head 12, and continuously conveying the external material by the rotation of the threaded rod 10 to generate reverse pressure to push the threaded rod 10 to move reversely to complete metering of the molten material;
s26, when the moving distance of the threaded rod 10 in the direction reaches a numerical value D, the flow control unit transmits a starting instruction to the pumping pressure oil cylinder unit, the pumping pressure oil cylinder unit starts to move forwards, and materials at the threaded head 12 are injected into the mold through the nozzle 13.
The threaded rod 10 is explained in detail as follows:
preselecting an adapted threaded rod 10;
the threaded rod 10 is conventionally divided into a general threaded rod 10 and a customized threaded rod 10, and the general threaded rod 10 is used for processing materials with low viscosity or medium viscosity;
the threaded rod 10 is generally divided into a charging section, a compression section and a metering section;
a universal threaded rod 10 is selected conventionally, a feeding section L1 occupies 45% -50%, a compression section L2 occupies 20% -30%, and a metering section L3 occupies 20% -30%;
the surface of a thread groove of the threaded rod 10 in the stage L1 is smooth enough, the length of L1 is enough to ensure the conveying of materials, the materials are prevented from being melted too early, if the materials are melted too early, the whole material conveying system is not stable enough, meanwhile, the plasticizing quality of the threaded rod 10 after the melting is difficult to ensure, the quality of the materials melted too early is poor, the quality of products is uneven, the materials are preliminarily melted in the stage L1, and then the materials are extruded by the threaded rod 10, the materials at the moment form a solid-liquid complex, and the thread groove is filled up by the solid-liquid complex;
the heating force of the material in the stage L2 is gradually increased from the entry point to the exit point, the material is completely melted when the exit point is reached, the material is converted into liquid from the solid-liquid complex, the length of L2 can influence the conversion from the solid-liquid complex to the liquid, and if L2 is too short, the material state is not in time to be converted;
the heating degree at the stage L3 is uniform, the temperature is uniform, the melt with high quality is formed, and the melt is uniformly discharged from the nozzle 13 under the help of certain pressure.
The depth of a thread groove of the L1 is h 1-0.12-0.16 d, and the deeper h1 is, the larger the feeding amount is, so that the overall production efficiency of the device is improved;
the length of the L2 is L21 ═ 6-8 d, and the L2 with the length can increase the torque and energy consumption of the threaded rod 10, so that the threaded rod is suitable for thermosensitive materials;
l22 is 3-4 d, and the L2 with the length is suitable for materials with obvious melting points;
the length of the L3 is L3-5 d, the length of the L3 is used for stabilizing the pressure in the material injection cylinder 7, so that materials can be uniformly extruded from the nozzle 13, the depth of the thread groove h3 at the stage is shallow, the plasticizing effect of the melt is improved, and the homogenization of the melt is facilitated;
wherein d is the outer diameter of the threaded rod 10;
a is h1/h3, a is a compression ratio, namely the depth of the thread groove at the stage of L1 and the depth of the thread groove at the stage of L3, a is increased, the shearing effect of the threaded rod 10 is enhanced, a is decreased, the plasticizing capacity is enhanced, the numerical value of a is stored in advance by the threaded rod adjusting unit, for materials with obvious melting points, the compression ratio interval is 2.6-3.0, for materials with higher thermal stability, the threaded rod 10 with higher A value is selected, for thermosensitive materials, a threaded rod 10 with a low A value is selected, three sections of the threaded rod 10 can be automatically adjusted in a telescopic mode, a threaded rod adjusting unit achieves the purpose of controlling the threaded rod 10 through the A value, materials are poured into a feeding hole, the poured material information needs to be input into a system, the threaded rod adjusting unit automatically adjusts the length of each stage of the threaded rod 10 according to the input information, and reduces the time for replacing the threaded rod 10.
The concrete analysis of the charging barrel 7 is:
the space between the threaded rod 10 and the wall of the injection barrel 7 is a barrel gap, the gap v is 0.002-0.005 d, the radius of the injection barrel 7 can be adjusted, the threaded rod adjusting unit controls the injection molding quality by adjusting the numerical value of the gap v, the gap v is large, the plasticizing quality is deviated, the injection time is long, the gap v is small, and the material can block the gap to cause the clamping of the threaded rod 10;
inputting the model of the mold into the system, automatically adjusting the outward expansion degree of the nozzle 13 by the system according to the obtained signal, if the mold volume is smaller, reducing the outward expansion angle of the nozzle 13, and if the mold volume is larger, increasing the outward expansion angle of the nozzle 13.
The threaded rod 10 has the following characteristics in operation:
the threaded rod 10 has two functions of plasticization and injection;
during the plasticizing process of the threaded rod 10, the thermal history is longer than the extrusion time.
It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus.
Finally, it should be noted that: although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that changes may be made in the embodiments and/or equivalents thereof without departing from the spirit and scope of the invention. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims (10)

1. Intelligent injection mold is used in production based on expanded polypropylene material, including die holder (1), upper die base (2) and intelligent injection molding system, its characterized in that: hydraulic motor (3) are installed at the top of upper die base (2), charge door (5) have been seted up at the top of upper die base (2), charge door (5) evenly distributed is in the side of hydraulic motor (3), pump pressure hydro-cylinder (4) are evenly installed to the bottom side of upper die base (2), injection cylinder (7) are evenly installed to the bottom middle zone of upper die base (2), the bottom fixed mounting of pump pressure hydro-cylinder (4) has injection oil seat (6), injection cylinder (7) run through injection oil seat (6), mould groove (11) have been seted up at the top of die holder (1), the top side fixed mounting of die holder (1) has fixed column (14).
2. The intelligent injection mold for production based on the expanded polypropylene material according to claim 1, wherein: annotate feed cylinder (7) including threaded rod (10), screw thread head (12) are installed to the bottom of threaded rod (10), nozzle (13) are installed to the bottom of screw thread head (12), install heating ring (9) on the inner wall of annotating feed cylinder (7), cooling water circle (8) are installed at the top of annotating feed cylinder (7), evenly distributed has sliding plate (15) in the thread groove of threaded rod (10), open in the thread groove of threaded rod (10) and be equipped with the recess, be close to in the recess and install air cavity (17) on the diapire of below, the bottom fixed mounting of sliding plate (15) has push rod (16), push rod (16) are sealed sliding connection with air cavity (17), install pressure sensors in air cavity (17).
3. The intelligent injection mold for production based on the expanded polypropylene material according to claim 2, wherein: the intelligent injection molding system comprises a mold closing module, an injection material module and an auxiliary driving module, wherein the mold closing module comprises an ejection unit and a mold adjusting unit, the injection material module comprises an intelligent start-stop unit, a threaded rod adjusting unit and a pumping pressure oil cylinder unit, and the auxiliary driving module comprises a heating unit, a cooling unit, a flow control unit and a fault protection unit.
4. The intelligent injection mold for production based on the expanded polypropylene material according to claim 3, wherein: the ejection unit is used for smoothly demoulding a cooled and formed product, the die adjusting unit is used for adjusting the position of the upper die base (2) and the position of a die groove (11) of the lower die base (1), the intelligent start-stop unit is used for monitoring the situation of the feed inlet (5) in real time, the start and stop of the automatic control threaded rod (10), the threaded rod adjusting unit is used for adjusting the rotating speed and the rotating direction of the threads, the pumping oil cylinder unit is used for adjusting the propelling force of the threaded rod (10), the heating unit is used for adjusting the heating temperature, the cooling unit is used for adjusting the reduction amplitude of the temperature in real time, the flow monitoring unit is used for comprehensively planning the sequence of each step, and the fault protection unit is used for protecting devices and operating workers.
5. The intelligent injection mold for production based on the expanded polypropylene material according to claim 4, wherein: the operation flow of the intelligent injection molding machine is as follows:
s1, adding a material into a material injection barrel (7) from a feeding port (5);
s2, a heating ring (9) in the charging barrel (7) starts to act for heating to melt the materials;
s3, starting the hydraulic motor (3), driving the threaded rod (10) to rotate by the hydraulic motor (3), conveying materials along the direction of a screw groove on the threaded rod (10), and shearing the materials by the threaded rod (10);
s4, conveying the material to the threaded head (12), pushing the threaded rod (10) by the material reaction along with the accumulation of the material, and forming a material storage space at the threaded head (12);
s5, starting a pumping pressure oil cylinder (4), and pushing and injecting the materials accumulated at the threaded head (12) into a mold;
s6, pressurizing the mold injected with the material;
s7, cooling the mold;
and S8, ejecting the shaped product out of the mold through an ejection device.
6. The intelligent injection mold for production based on the expanded polypropylene material according to claim 5, wherein: the concrete operation steps of the material injection cylinder (7) for starting plasticizing are as follows:
s21, when pre-molding, inputting materials into the material injection barrel (7), when the materials pass through the material inlet, transmitting signals to the intelligent starting and stopping unit by a displacement sensor on the wall of the material inlet opening, receiving instructions by the intelligent starting and stopping unit to drive the threaded rod (10) to rotate, when the materials are not added at the material inlet opening, transmitting an instruction of prolonging 1min by the intelligent starting and stopping unit, and automatically stopping the operation of the threaded rod (10) after 1 min;
s22, the intelligent start-stop unit and the heating unit are started with time difference, and the heating ring (9) runs after the threaded rod (10) rotates for 1 min;
s23, material size and viscosity are distinguished, the rotating force of the threaded rod (10) is controlled according to different characteristics of different materials, the viscosity of a solution of the materials after melting is changed from small to large, the thrust applied to the sliding plate (15) is changed from small to large in real time, the threaded rod (10) rotates to push molten liquid, the molten liquid is conveyed through a threaded groove in the threaded rod (10), the sliding plate (15) is pushed in the conveying process, the sliding plate (15) drives the push rod (16) to move, the push rod (16) moves in the air cavity (17), the air pressure in the air cavity (17) is gradually increased along with the movement of the push rod (16), the pressure sensor monitors in real time, monitored values are transmitted to a threaded rod adjusting unit, and the threaded rod adjusting unit adjusts the corresponding rotating force according to the obtained data;
s24, the rotating force of the threaded rod (10) is divided into 12 gradients which are T1-T12, wherein the rotating force of T1 is minimum, the rotating force of T12 is maximum, and the pressure numerical range of each interval corresponds to data measured by a pressure sensor;
s25, plasticizing the fixed material under the dual action of shearing by the heating ring (9) and the threaded rod (10) and through the thermal history of each functional section of the threaded rod (10), continuously conveying the external material by the rotation of the threaded rod (10) and the addition of the molten material to generate reverse pressure, and pushing the threaded rod (10) to move reversely to complete metering of the molten material;
s26, when the moving distance of the threaded rod (10) in the direction reaches a numerical value D, the process control unit transmits a starting instruction to the pumping pressure oil cylinder unit, the pumping pressure oil cylinder unit starts to move forwards, and materials at the threaded head (12) are injected into the die through the nozzle (13).
7. The intelligent injection mold for production based on the expanded polypropylene material according to claim 6, wherein: the threaded rod (10) is explained in detail as follows:
preselecting an adapted threaded rod (10);
the threaded rod (10) is divided into a general threaded rod (10) and a customized threaded rod (10) conventionally, and the general threaded rod (10) is used for processing materials with low viscosity or medium viscosity;
the threaded rod (10) is generally divided into a charging section, a compression section and a metering section;
a universal threaded rod (10) is selected conventionally, a feeding section L1 occupies 45% -50%, a compression section L2 occupies 20% -30%, and a metering section L3 occupies 20% -30%;
the surface of a thread groove of the threaded rod (10) in the stage L1 is smooth enough, the length of L1 is enough to ensure the conveying of materials, the situation that the materials are melted too early is avoided, if the materials are melted too early, the whole material conveying system is not stable enough, meanwhile, the plasticizing quality of the threaded rod (10) is difficult to ensure, the quality of the materials melted too early is poor, the quality of products is uneven, the materials are preliminarily melted in the stage L1, then the materials are extruded through the threaded rod (10), the materials at the moment form a solid-liquid complex, and the thread groove is filled with the solid-liquid complex;
the heating force of the material in the stage L2 is gradually increased from the entry point to the exit point, the material is completely melted when the exit point is reached, the material is converted into liquid from the solid-liquid complex, the length of L2 can influence the conversion from the solid-liquid complex to the liquid, and if L2 is too short, the material state is not in time to be converted;
the heating degree of the L3 stage is more uniform, the temperature is more uniform, the melt with higher quality is formed, and the melt is uniformly discharged from the nozzle (13) under the help of certain pressure.
8. The intelligent injection mold for production based on the expanded polypropylene material according to claim 7, wherein: the depth of the thread groove of the L1 is h1 ═ 0.12-0.16 d, and the deeper h1 is, the larger the feeding amount is, so that the overall production efficiency of the device is improved;
the length of the L2 is L21 ═ 6-8 d, and the L2 with the length can increase the torque and energy consumption of the threaded rod (10), so that the threaded rod is suitable for thermosensitive materials;
l22 is (3-4) d, and L2 with the length is suitable for materials with obvious melting points;
the length of L3 is L3 ═ 4-5 d, and the length of L3 is used for stabilizing the pressure in the injection cylinder (7), so that the material can be uniformly extruded from the nozzle (13), the depth of the thread groove h3 at the stage is shallow, the plasticizing effect of the melt is improved, and the homogenization of the melt is facilitated;
wherein d is the outer diameter of the threaded rod (10);
a is h1/h3, A is a compression ratio, namely the depth of a thread groove at the L1 stage and the depth of a thread groove at the L3 stage, A is increased, the shearing effect of the threaded rod (10) is enhanced, A is reduced, the plasticizing capacity is enhanced, the numerical value of A is stored in advance by the threaded rod adjusting unit, the compression ratio interval is 2.6-3.0 for materials with obvious melting points, the threaded rod (10) with a higher A value is selected for materials with higher thermal stability, the threaded rod (10) with a lower A value is selected for heat-sensitive materials, three sections of the threaded rod (10) can be automatically adjusted in a telescopic mode, the threaded rod adjusting unit achieves the purpose of controlling the threaded rod (10) through the A value, before the materials are poured into the feeding port, the information of the poured materials needs to be input into the system, the threaded rod adjusting unit automatically adjusts the lengths of all stages of the threaded rod (10) according to the input information, the time for replacing the threaded rod (10) is reduced.
9. The intelligent injection mold for production based on the expanded polypropylene material according to claim 8, wherein: the concrete analysis of the charging barrel (7) is as follows:
the space between the threaded rod (10) and the wall of the material injection cylinder (7) is a cylinder gap, and the gap v is equal to the gap
(0.002-0.005) d, the radius of the injection cylinder (7) is adjustable, the threaded rod adjusting unit controls the injection molding quality by adjusting the numerical value of the gap v, if the value of the gap v is larger, the plasticizing quality is deviated, the injection time is longer, the value of the gap v is smaller, and the material can block the gap to cause the clamping of the threaded rod (10);
and inputting the model of the mold into a system, automatically adjusting the outward expansion degree of the nozzle (13) by the system according to the obtained signal, if the mold volume is smaller, reducing the outward expansion angle of the nozzle (13), and if the mold volume is larger, increasing the outward expansion angle of the nozzle (13).
10. The intelligent injection mold for production based on the expanded polypropylene material according to claim 9, wherein: the threaded rod (10) has the following characteristics during operation:
the threaded rod (10) has two functions of plasticizing and injecting;
during the plasticizing process of the threaded rod (10), the thermal history is longer than the extrusion time.
CN202111476928.3A 2021-12-02 2021-12-02 Intelligent injection mold is used in production based on foaming polypropylene material Pending CN114161674A (en)

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Application Number Priority Date Filing Date Title
CN202111476928.3A CN114161674A (en) 2021-12-02 2021-12-02 Intelligent injection mold is used in production based on foaming polypropylene material

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202111476928.3A CN114161674A (en) 2021-12-02 2021-12-02 Intelligent injection mold is used in production based on foaming polypropylene material

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CN114161674A true CN114161674A (en) 2022-03-11

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