CN113043542B - Mechanism for hiding flash of injection molding gas-assisted mold and flash hiding method - Google Patents

Mechanism for hiding flash of injection molding gas-assisted mold and flash hiding method Download PDF

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Publication number
CN113043542B
CN113043542B CN202110259886.1A CN202110259886A CN113043542B CN 113043542 B CN113043542 B CN 113043542B CN 202110259886 A CN202110259886 A CN 202110259886A CN 113043542 B CN113043542 B CN 113043542B
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Prior art keywords
hole
flash
core
oil cylinder
drawing needle
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CN202110259886.1A
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CN113043542A (en
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梁正华
王华良
郑炳国
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Taizhou Kaihua Automobile Mould Co ltd
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Taizhou Kaihua Automobile Mould Co ltd
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Priority to CN202110259886.1A priority Critical patent/CN113043542B/en
Priority to PCT/CN2021/102521 priority patent/WO2022188300A1/en
Publication of CN113043542A publication Critical patent/CN113043542A/en
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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
    • B29C45/26—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
    • B29C45/1703—Introducing an auxiliary fluid into the mould
    • B29C45/1704—Introducing an auxiliary fluid into the mould the fluid being introduced into the interior of the injected material which is still in a molten state, e.g. for producing hollow articles
    • 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
    • B29C45/38—Cutting-off equipment for sprues or ingates

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

Abstract

The mechanism comprises an upper compound plate and a lower compound plate, wherein a cavity is arranged below the upper compound plate, and a core is arranged above the lower compound plate, and the injection molding gas-assisted mold is characterized in that: an insert and a material handle assembly are arranged on the cavity, and a core-pulling hole is formed in the insert; the material handle assembly comprises a drawing needle and a telescopic device, the drawing needle is inserted into the core-pulling hole to be installed, and can axially slide in the core-pulling hole under the telescopic action of the telescopic device; the insert is also internally provided with an overflow hole which is communicated with the middle part of the core-pulling hole, and the overflow hole can be sealed or communicated with the core-pulling hole by the axial sliding of the core-pulling needle. According to the invention, the structure that the insert and the material handle assembly are arranged on the cavity is adopted, the drawing needle moves backwards and blows air into the mold, so that redundant plastic is blown into the core-pulling hole and then flows out through the overflow hole, and the drawing needle moves forwards and can push the plastic in the core-pulling hole back into the mold, so that the material handle is hidden, the production efficiency can be improved, the compactness of an injection molding product can be increased, and the product quality is improved.

Description

Mechanism for hiding flash of injection molding gas-assisted mold and flash hiding method
Technical Field
The invention relates to the field of injection molds, in particular to a mechanism for hiding flash of an injection gas-assisted mold and a flash hiding method.
Background
The injection molding gas-assisted mold is adopted to manufacture plastic parts, a material handle is left on a gas-assisted plastic product after the normal gas-assisted mold completes injection molding, the product is trimmed manually in the traditional method, and the additional cost and time of a main engine plant are increased by using the manual method. And the air-assisted product of normal injection molding can leave unsightly gate marks on the product even if the product is manually trimmed when the material is left on the product. Therefore, if the material handle can be removed or hidden by adopting a process in the injection molding process, the production efficiency and the product quality can be greatly improved.
Disclosure of Invention
Aiming at the defects of the prior art, the invention provides a mechanism for hiding flash of an injection gas-assisted mold and a flash hiding method, and the technological method for hiding flash of the injection gas-assisted mold adopts a structure that an insert and a flash handle assembly are arranged on a cavity, a drawing needle is moved backwards to blow air into the mold, so that redundant plastic is blown into a core-pulling hole and then flows out through the flash hole, the drawing needle is moved forwards to push the plastic in the core-pulling hole back into the mold, and thus the flash handle is hidden, the production efficiency can be improved, the compactness of an injection product can be increased, and the product quality can be improved.
The invention has the following specific technical scheme that the mechanism for hiding flash material handles in the injection molding gas-assisted mold comprises an upper compound plate and a lower compound plate, wherein a cavity is arranged below the upper compound plate, and a core is arranged above the lower compound plate, and is characterized in that: the die cavity is provided with an insert and a material handle assembly, and the insert is internally provided with a core pulling hole; the material handle assembly comprises a drawing needle and a telescopic device, the drawing needle is inserted into the core-pulling hole to be installed, and can axially slide in the core-pulling hole under the telescopic action of the telescopic device; the insert is also internally provided with an overflow hole which is communicated with the middle part of the core-pulling hole, and the axial sliding of the drawing needle can seal or communicate the overflow hole with the core-pulling hole.
Therefore, the insert and the material handle assembly are mounted on the cavity, the drawing needle moves backwards to blow into the mold, so that redundant plastic can be blown into the core pulling hole, then the excessive plastic flows out through the material overflowing hole, the drawing needle moves forwards to push the plastic in the core pulling hole back into the mold, the material handle is hidden, and the compactness of an injection product can be improved.
Preferably, a molding cavity is arranged at the joint of the insert and the cavity, the inner end of the core pulling hole is communicated with the molding cavity, and the back end surface of the drawn needle after moving to the bottom is coplanar with the inner wall of the molding cavity.
Therefore, the front end face of the drawing needle in the state of moving to the bottom is a part of the cavity, and the injection molding product is ensured to be kept flat at the drawing needle.
Preferably, the overflow hole is conical, and the diameter of the cross section of the overflow hole is gradually increased from one end communicated with the core-pulling hole to the outside.
Therefore, the overflow hole is conical and expands outwards, so that the overflow process can be more smooth, the overflow hole can be more easily cleaned, and the overflow hole is prevented from being blocked.
Preferably, the material handle assembly further comprises an oil cylinder meson, the telescopic device is an oil cylinder, the telescopic end of a piston rod of the oil cylinder is connected with the oil cylinder meson, and the tail end of the drawing needle is connected with the oil cylinder meson.
Therefore, the drawing needle is connected with the telescopic device through the oil cylinder meson, so that the drawing needle can be ensured to transversely move relative to the telescopic device to realize self-adaptive adjustment, and clamping stagnation is avoided.
Preferably, a clamping groove is formed in one end, connected with the drawing needle, of the oil cylinder meson, a clamping ring is arranged at the tail end of the drawing needle, and the clamping ring is clamped into the clamping groove to be connected.
Therefore, the clamping ring can transversely and adaptively move in the clamping groove, and the drawing needle axially and limitedly moves back and forth along with the expansion of the oil cylinder piston rod.
Preferably, the cavity is provided with a strip-shaped induction seat, two ends of the induction seat are respectively provided with a flash proximity switch and a material hiding proximity switch, the side surface of the oil cylinder meson is connected with an induction contact rod, the induction contact rod is L-shaped, and the bending section is positioned between the flash proximity switch and the material hiding proximity switch.
Therefore, the induction contact rod and the drawing needle move synchronously, when the drawing needle moves backwards and moves to a position close to the termination position, the flash proximity switch induces, and the oil cylinder piston rod is controlled to decelerate through the electromagnetic valve; when the drawing needle moves forwards to the position close to the end position, the material hiding proximity switch senses the movement and controls the speed of the piston rod of the oil cylinder to be reduced through the electromagnetic valve.
Preferably, the oil cylinder is controlled by an electromagnetic proportional reversing valve and an electromagnetic proportional throttle valve, and the stroke of the flash proximity switch and the stroke of the material storing proximity switch after being triggered are larger than the diameter of the communication part of the flash hole and the core pulling hole.
Therefore, the oil cylinder controls reversing and overall speed adjustment through the electromagnetic proportional reversing valve, and controls the speed accurate adjustment of the stroke of the two ends of the piston rod approaching to the bottom section through the electromagnetic proportional throttle valve; the stroke of the flash proximity switch and the stroke of the material hiding proximity switch after being triggered are larger than the diameter of the communication part of the flash hole and the core pulling hole, so that the speed of the drawing needle passing through the flash hole can be accurately controlled.
The injection molding gas-assisted mold flash material hiding method is characterized by comprising the following operation steps:
A. the die cavity and the core are matched;
B. injecting hot-melt plastic into the mold by an injection molding machine;
C. the air valve is used for controlling air blowing into the mold, the oil cylinder drives the drawing needle to move backwards until the front end of the core drawing hole passes through the flash hole, and the core drawing hole is communicated with the flash hole, so that redundant plastic in the air-assisted product flows into the core drawing hole and flows out of the flash hole;
D. after the piston rod of the oil cylinder moves back to the bottom, the oil cylinder keeps a stop state, and after the oil cylinder waits for set time, the controller controls the electromagnetic proportional directional valve to switch the direction, so that the piston rod of the oil cylinder stretches out reversely;
E. before the plastic is solidified and formed, the oil cylinder drives the drawing needle to move forwards until the end face and the inner wall of the forming cavity are coplanar, and the plastic in the core-pulling hole is pushed back to the mold;
F. the cavity and the core are split.
Therefore, through the process steps, the flash and the hidden material of the material handle of the injection molding product are formed at one time, a redundant cutting and modifying process is not needed, the cost is reduced, the production efficiency is improved, the compactness of the injection molding product is improved, and the product quality is improved.
Preferably, step C comprises the steps of:
c1, in the process that the drawing needle moves backwards at the initial position, the oil cylinder is controlled by the electromagnetic proportional directional valve, and the drawing needle moves faster and faster;
c2, when the drawing needle moves to be close to the opening of the flash hole, the induction feeler lever triggers the flash approach switch to work, and the flash approach switch transmits an electric signal to the controller and then controls the throttle hole of the electromagnetic proportional throttle valve to gradually reduce, so that the drawing needle slowly decelerates to stop.
Therefore, the speed of the drawing needle before reaching the flash hole is high, the efficiency can be improved, the speed is reduced when the drawing needle passes through the flash hole, and the stability of the flash process is ensured.
As a preference of the present invention, step E comprises the following substeps:
e1, in the process that the drawing needle moves forwards at the outermost position, the induction feeler lever is in a state of triggering the flash proximity switch, and the flash proximity switch transmits an electric signal to the controller and then controls the orifice of the electromagnetic proportional throttle valve to be kept in a small state, so that the drawing needle slowly passes through the flash hole opening at a constant speed;
e2 the drawing needle remove to with when the shutoff of flash hole opening, the response feeler lever breaks away from flash proximity switch, the electromagnetism proportional reversing valve throughput is crescent earlier and is reduced gradually, the response feeler lever triggers hide material proximity switch during operation, hide material proximity switch with signal of telecommunication give controller back control electromagnetism proportional throttle valve orifice reduces gradually, thereby makes the drawing needle slowly slows down to stopping.
Therefore, the drawing needle keeps slow and uniform speed when moving forwards and passing through the overflow hole, bubbles are prevented from entering, the drawing needle is accelerated and then decelerated when moving forwards continuously, the efficiency is improved, and the drawing needle is decelerated when approaching the inner wall of the forming cavity, so that the material storing process is ensured to be stable.
In conclusion, the invention has the following beneficial effects:
the mechanism for hiding the flash in the injection gas-assisted mold and the flash hiding process method thereof adopt the structure that the insert and the flash handle assembly are arranged on the cavity, the drawing needle moves backwards to blow air into the mold, so that redundant plastic is blown into the core-pulling hole and then flows out through the flash hole, and the drawing needle moves forwards to push the plastic in the core-pulling hole back into the mold, thereby hiding the flash handle, not only improving the production efficiency, but also increasing the compactness of an injection product and improving the product quality.
Drawings
FIG. 1 is a schematic structural view of a mechanism for hiding flash in an injection molding gas-assisted mold according to the present invention;
FIG. 2 is a schematic structural diagram of a material handle assembly of the injection molding air-assisted mold hidden flash handle mechanism of the present invention;
FIG. 3 is a schematic structural view of the material handle assembly and the insert of the hidden flash handle mechanism of the injection molding air-assisted mold of the present invention;
FIG. 4 is a schematic structural view of the injection molding air-assisted mold with flash concealed to move the mechanical material handle assembly forward to the bottom;
FIG. 5 is a schematic structural view of the injection air-assisted mold of the present invention with flash concealed to move the mechanical material handle assembly back to the bottom;
FIG. 6 is a schematic structural view of the injection molding air-assisted mold with flash hidden and blocking flash holes during movement of the mechanism handle assembly;
in the figure, 1-upper compound plate, 2-lower compound plate, 3-cavity, 4-core, 5-insert, 51-core-pulling hole, 52-overflow hole, 6-material handle component, 61-needle-pulling, 611-snap ring, 62-telescoping device, 63-oil cylinder meson, 631-slot, 64-induction feeler lever, 7-induction seat, 8-overflow proximity switch and 9-material-hiding proximity switch.
Detailed Description
The invention will be further explained by means of specific embodiments with reference to the drawings.
Like figure 1, figure 2, figure 3, figure 4, figure 5, figure 6, the gas-assisted mould of moulding plastics hides flash and constructs, including compound board 1 and lower compound board 2, goes up compound board 1 below installation die cavity 3, installs core 4, its characterized in that below compound board 2: an insert 5 and a material handle assembly 6 are arranged on the cavity 3, and a core-pulling hole 51 is formed in the insert 5; the material handle assembly 6 comprises a drawing needle 61 and a telescopic device 62, wherein the drawing needle 61 is inserted into the coring hole 51 for installation, and can axially slide in the coring hole 51 under the telescopic action of the telescopic device 62; the insert 5 is further provided with an overflow hole 52, the overflow hole 52 is communicated with the middle part of the core-pulling hole 51, and the overflow hole 52 can be closed or communicated with the core-pulling hole 51 by the axial sliding of the drawing needle 61.
Therefore, by installing the insert 5 and the material handle assembly 6 on the cavity 3, the drawing needle 61 is moved backwards to blow air into the mold to blow redundant plastic into the core pulling hole 51, then the plastic flows out through the material overflowing hole 52, the drawing needle 61 is moved forwards to push the plastic in the core pulling hole 51 back into the mold, so that the material handle is hidden, and the compactness of an injection molding product can be improved.
As shown in figures 3 and 4, a molding cavity is arranged at the joint of the insert 5 and the cavity 3, the inner end of the core pulling hole 51 is communicated with the molding cavity, and the back end surface of the pulling needle 61 which moves to the bottom is coplanar with the inner wall of the molding cavity.
Therefore, the front end face of the drawing needle 61 in the state of moving to the bottom is a part of the cavity 3, and the injection molding product is ensured to be flat at the drawing needle 61.
As shown in fig. 3, 4, 5 and 6, the flash hole 52 has a conical shape, and the cross-sectional diameter thereof gradually increases from the end communicating with the cored hole 51 to the outside.
Therefore, the overflow hole 52 is conical and is enlarged outwards, so that the overflow process is more smooth, the overflow hole 52 is easier to clean, and the overflow hole 52 is prevented from being blocked.
Referring to fig. 1, 2 and 3, the material handle assembly 6 further includes an oil cylinder meson 63, the telescopic device 62 is an oil cylinder, the telescopic end of the piston rod of the oil cylinder is connected with the oil cylinder meson 63, and the tail end of the draw pin 61 is connected with the oil cylinder meson 63.
Therefore, the drawing needle 61 and the telescopic device 62 are connected through the oil cylinder meson 63, so that the drawing needle 61 can transversely move relative to the telescopic device 62 to realize self-adaptive adjustment, and clamping stagnation is avoided.
Referring to fig. 2, 3, 4, 5 and 6, a clamping groove 631 is formed at one end of the oil cylinder meson 63 connected with the drawing needle 61, a clamping ring 611 is arranged at the tail end of the drawing needle 61, and the clamping ring 611 is clamped into the clamping groove 631 for connection.
Therefore, the clamping ring 611 can move in the clamping groove 631 in a transverse self-adaptive mode, and the drawing needle 61 is limited to move back and forth along with the expansion of the cylinder piston rod in the axial direction.
Referring to fig. 2 and 3, a strip-shaped induction seat 7 is installed on the cavity 3, a flash proximity switch 8 and a material hiding proximity switch 9 are respectively installed at two ends of the induction seat 7, an induction contact rod 64 is connected to the side surface of the oil cylinder meson 63, the induction contact rod 64 is in an L shape, and a bending section is located between the flash proximity switch 8 and the material hiding proximity switch 9.
Therefore, the induction contact rod 64 and the drawing needle 61 move synchronously, when the drawing needle 61 moves backwards and moves to a position close to the end position, the flash approach switch 8 induces, and the oil cylinder piston rod is controlled to decelerate through the electromagnetic valve; when the drawing needle 61 moves forward to approach the end position, the material hiding approach switch 9 senses the material hiding approach switch, and the piston rod of the oil cylinder is controlled to decelerate through the electromagnetic valve.
The oil cylinder is controlled by an electromagnetic proportional reversing valve and an electromagnetic proportional throttle valve, and the stroke of the triggered flash proximity switch 8 and the triggered material hiding proximity switch 9 is larger than the diameter of the communicated part of the flash hole 52 and the core pulling hole 51.
Therefore, the oil cylinder controls reversing and integral speed regulation through the electromagnetic proportional reversing valve, and controls the speed precision regulation of the stroke of the two ends of the piston rod approaching to the bottom section through the electromagnetic proportional throttle valve; the stroke of the flash proximity switch 8 and the stroke of the material hiding proximity switch 9 after being triggered are larger than the diameter of the communicated part of the flash hole 52 and the core pulling hole 51, so that the speed of the drawing needle 61 passing through the flash hole 52 can be accurately controlled.
The material overflowing and storing method for the injection molding gas-assisted mold comprises the following operation steps of:
A. the die cavity 3 and the die core 4 are matched;
B. injecting hot-melt plastic into the mold by an injection molding machine;
C. the air valve is used for controlling air blowing into the mold, the oil cylinder drives the drawing needle 61 to move backwards until the front end of the core drawing hole 51 passes through the flash hole 52, the core drawing hole 51 is communicated with the flash hole 52, so that redundant plastic in the air-assisted product flows into the core drawing hole 51 and flows out of the flash hole 52;
D. after the piston rod of the oil cylinder moves back to the bottom, the oil cylinder keeps a stop state, and after the set time, the controller controls the electromagnetic proportional directional valve to switch the direction, so that the piston rod of the oil cylinder stretches out reversely;
E. before the plastic is solidified and formed, the oil cylinder drives the drawing needle 61 to move forwards until the end surface and the inner wall of the forming cavity are coplanar, and the plastic in the core drawing hole 51 is pushed back to the mold;
F. the cavity 3 and the core 4 are split.
Therefore, through the process steps, the flash and the hidden material of the material handle of the injection molding product are formed at one time, a redundant cutting and modifying process is not needed, the cost is reduced, the production efficiency is improved, the compactness of the injection molding product is improved, and the product quality is improved.
The step C comprises the following steps:
c1, in the process that the drawing needle 61 moves backwards at the initial position, the oil cylinder is controlled by an electromagnetic proportional directional valve, and the moving speed of the drawing needle 61 is faster and faster;
c2, when the drawing needle 61 moves to the position close to the opening of the flash hole 52, the inductive feeler lever 64 triggers the flash approach switch 8 to work, and the flash approach switch 8 transmits an electric signal to the controller to control the electromagnetic proportional throttle valve orifice to gradually decrease, so that the drawing needle 61 slowly decelerates to stop.
Therefore, the speed of the drawing needle 61 is high before reaching the flash hole 52, the efficiency can be improved, the speed is reduced when the drawing needle passes through the flash hole 52, and the stability of the flash process is ensured.
Step E comprises the following substeps:
e1, in the process that the drawing needle 61 moves forwards at the outermost position, the sensing feeler lever 64 is in a state of triggering the flash approach switch 8, and the flash approach switch 8 transmits an electric signal to the controller to control the orifice of the electromagnetic proportional throttle valve to be kept in a small state, so that the drawing needle 61 slowly passes through the opening of the flash hole 52 at a constant speed;
e2 and when the drawing pin 61 moves to close the opening of the flash hole 52, the sensing feeler lever 64 is separated from the flash proximity switch 8, the flow of the electromagnetic proportional directional valve is gradually increased and then gradually reduced, when the sensing feeler lever 64 triggers the material hiding proximity switch 9 to work, the material hiding proximity switch 9 controls the throttle hole of the electromagnetic proportional throttle valve to be gradually reduced after transmitting an electric signal to the controller, and therefore the drawing pin 61 is slowly decelerated to stop.
Therefore, the drawing needle 61 keeps slow at a constant speed when moving forwards and passing through the overflow hole 52, bubbles are prevented from entering, the drawing needle is accelerated and then decelerated when continuing to move forwards, the efficiency is improved, the drawing needle is decelerated when approaching the inner wall of the forming cavity, and the stability of the material storing process is ensured.
The above-described embodiments are merely illustrative of the preferred embodiments of the present invention and do not limit the spirit and scope of the present invention. Various modifications and improvements of the technical solutions of the present invention may be made by those skilled in the art without departing from the design concept of the present invention, and the technical contents of the present invention are all described in the claims.

Claims (5)

1. Mould plastics gas and assist mould and hide flash mechanism, including compound board (1) and lower compound board (2), go up compound board (1) below installation die cavity (3), mould core (4), its characterized in that are installed to compound board (2) top down: an insert (5) and a material handle assembly (6) are mounted on the cavity (3), and a core-pulling hole (51) is formed in the insert (5); the material handle assembly (6) comprises a drawing needle (61) and a telescopic device (62), wherein the drawing needle (61) is inserted into the coring hole (51) for installation, and can axially slide in the coring hole (51) under the telescopic action of the telescopic device (62); an overflow hole (52) is further formed in the insert (5), the overflow hole (52) is communicated with the middle part of the core-pulling hole (51), and the overflow hole (52) can be closed or communicated with the core-pulling hole (51) by the axial sliding of the pull needle (61);
the material handle assembly (6) further comprises an oil cylinder meson (63), the telescopic device (62) is an oil cylinder, the telescopic end of a piston rod of the oil cylinder is connected with the oil cylinder meson (63), and the tail end of the drawing needle (61) is connected with the oil cylinder meson (63);
a strip-shaped induction seat (7) is mounted on the cavity (3), a flash proximity switch (8) and a material hiding proximity switch (9) are mounted at two ends of the induction seat (7) respectively, an induction contact rod (64) is connected to the side surface of the oil cylinder meson (63), the induction contact rod (64) is L-shaped, and a bending section is located between the flash proximity switch (8) and the material hiding proximity switch (9);
the oil cylinder is controlled by an electromagnetic proportional directional valve and an electromagnetic proportional throttle valve, and the stroke of the flash proximity switch (8) and the stroke of the material hiding proximity switch (9) after being triggered are larger than the diameter of the connection part of the flash hole (52) and the core-pulling hole (51).
2. The injection molding air-assisted mold flash hiding mechanism of claim 1, wherein: a molding cavity is arranged at the joint of the insert (5) and the cavity (3), the inner end of the core pulling hole (51) is communicated with the molding cavity, and the back end surface of the pull needle (61) is coplanar with the inner wall of the molding cavity after moving to the bottom.
3. The injection molding air-assisted mold flash hiding mechanism of claim 1, wherein: the overflow hole (52) is conical, and the diameter of the section of the overflow hole is gradually increased from one end communicated with the core-pulling hole (51) to the outside.
4. The injection molding air-assisted mold flash hiding mechanism of claim 1, wherein: the oil cylinder meson (63) is provided with a clamping groove (631) at the end connected with the drawing needle (61), the tail end of the drawing needle (61) is provided with a clamping ring (611), and the clamping ring (611) is clamped into the clamping groove (631) for connection.
5. The injection molding gas-assisted mold flash hiding method is characterized by being used for the injection molding gas-assisted mold flash handle hiding mechanism of claim 1, and comprising the following operation steps of:
A. the die cavity (3) and the core (4) are matched;
B. injecting hot-melt plastic into the mold by an injection molding machine;
C. the air valve is used for controlling air blowing into the mold, the oil cylinder drives the drawing needle (61) to move backwards until the front end of the core drawing hole (51) passes through the overflow hole (52), the core drawing hole (51) is communicated with the overflow hole (52), and redundant plastic in the air-assisted product flows into the core drawing hole (51) and flows out of the overflow hole (52);
D. after the piston rod of the oil cylinder moves back to the bottom, the oil cylinder keeps a stop state, and after the set time, the controller controls the electromagnetic proportional directional valve to switch the direction, so that the piston rod of the oil cylinder stretches out reversely;
E. before the plastic is solidified and molded, the oil cylinder drives the drawing needle (61) to move forwards until the end surface and the inner wall of the molding cavity are coplanar, and the plastic in the core drawing hole (51) is pushed back to the mold;
F. the die cavity (3) and the core (4) are separated;
wherein step C comprises the following substeps:
c1, in the process that the drawing needle (61) moves backwards at the initial position, the oil cylinder is controlled by an electromagnetic proportional directional valve, and the moving speed of the drawing needle (61) is faster and faster;
c2, when the drawing needle (61) moves to be close to the opening of the flash hole (52), the induction feeler lever (64) triggers the flash proximity switch (8) to work, and the flash proximity switch (8) transmits an electric signal to a controller and then controls the orifice of the electromagnetic proportional throttle valve to gradually reduce, so that the drawing needle (61) slowly decelerates to stop;
wherein step E comprises the sub-steps of:
e1, during the forward movement of the drawing needle (61) at the outermost position, the sensing feeler lever (64) is in a state of triggering the flash proximity switch (8), and the flash proximity switch (8) transmits an electric signal to a controller to control the electromagnetic proportional throttle valve orifice to be kept in a small state, so that the drawing needle (61) is kept passing through the flash hole (52) opening slowly at a constant speed;
e2, when the drawing needle (61) moves to close the opening of the flash hole (52), the induction contact rod (64) is separated from the flash proximity switch (8), the flow rate of the electromagnetic proportional reversing valve is gradually increased and then gradually decreased, when the induction contact rod (64) triggers the material hiding proximity switch (9) to work, the material hiding proximity switch (9) transmits an electric signal to the controller and then controls the orifice of the electromagnetic proportional throttle valve to gradually decrease, and therefore the drawing needle (61) is slowly decelerated to stop.
CN202110259886.1A 2021-03-10 2021-03-10 Mechanism for hiding flash of injection molding gas-assisted mold and flash hiding method Active CN113043542B (en)

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Application Number Priority Date Filing Date Title
CN202110259886.1A CN113043542B (en) 2021-03-10 2021-03-10 Mechanism for hiding flash of injection molding gas-assisted mold and flash hiding method
PCT/CN2021/102521 WO2022188300A1 (en) 2021-03-10 2021-06-25 Overflow material handle hiding mechanism and overflow material hiding method for injection molded gas-assisted mold

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Application Number Priority Date Filing Date Title
CN202110259886.1A CN113043542B (en) 2021-03-10 2021-03-10 Mechanism for hiding flash of injection molding gas-assisted mold and flash hiding method

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CN113043542B true CN113043542B (en) 2022-03-25

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