CN110919991B - Double-color injection mold with changeable blade core-pulling assembly and working method thereof - Google Patents

Double-color injection mold with changeable blade core-pulling assembly and working method thereof Download PDF

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Publication number
CN110919991B
CN110919991B CN201911390279.8A CN201911390279A CN110919991B CN 110919991 B CN110919991 B CN 110919991B CN 201911390279 A CN201911390279 A CN 201911390279A CN 110919991 B CN110919991 B CN 110919991B
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China
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pulling
core
mold
soft rubber
hard rubber
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CN201911390279.8A
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CN110919991A (en
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王丁强
单士友
孙文强
王纪学
王洪波
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Qingdao Hi Tech Moulds Co ltd
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Qingdao Hi Tech Moulds Co ltd
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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
    • B29C45/33—Moulds having transversely, e.g. radially, movable mould parts
    • B29C45/332—Mountings or guides therefor; Drives therefor
    • 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
    • B29C45/16—Making multilayered or multicoloured articles
    • B29C45/1615—The materials being injected at different moulding stations
    • B29C45/1628—The materials being injected at different moulding stations using a mould carrier rotatable about an axis perpendicular to the opening and closing axis of the moulding stations
    • 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
    • B29C45/16—Making multilayered or multicoloured articles
    • B29C45/1676—Making multilayered or multicoloured articles using a soft material and a rigid material, e.g. making articles with a sealing part
    • 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
    • B29C45/40—Removing or ejecting moulded articles
    • B29C45/4005—Ejector constructions; Ejector operating mechanisms
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
    • Y02P70/10—Greenhouse gas [GHG] capture, material saving, heat recovery or other energy efficient measures, e.g. motor control, characterised by manufacturing processes, e.g. for rolling metal or metal working

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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 invention discloses a double-color injection mold with a conversion blade core-pulling assembly, which comprises a front mold and a rear mold, wherein two groups of conversion core-pulling assemblies are symmetrically arranged at two ends of each rear mold cavity, each conversion core-pulling assembly comprises a hard rubber core-pulling assembly and a soft rubber core-pulling assembly, and the hard rubber core-pulling assemblies are arranged along the mold opening direction. One end of the hard rubber core-pulling head is provided with a hard rubber core-pulling head, and the other end of the hard rubber core-pulling head is provided with a hard rubber core-pulling oil cylinder. The soft rubber core pulling is positioned on one side of the hard rubber core pulling, and the soft rubber core pulling is obliquely arranged relative to the mold opening direction. One end of the soft rubber core pulling is provided with a soft rubber core pulling head, and the other end of the soft rubber core pulling head is provided with a soft rubber core pulling oil cylinder. The invention also discloses a working method of the double-color injection mold. The invention realizes the embedding of the soft rubber part into the hard rubber part by the way of alternately ejecting the hard rubber and the soft rubber core. The oil way arrangement mode is reasonable, the core pulling of different groups of core pulling conversion assemblies shares the same oil way, and the oil ways are synchronously matched, so that the oil way structure is simplified, the number of main oil ways is reduced, the core pulling control is simpler and more convenient, and the selection requirement on the injection molding machine is reduced.

Description

Double-color injection mold with changeable blade core-pulling assembly and working method thereof
Technical Field
The invention relates to the technical field of injection molds, in particular to a double-color injection mold with a changeable blade core-pulling assembly and a working method thereof.
Background
The double-color injection mold is used for forming a double-color product piece with a hard rubber part and a soft rubber part combined into an integrated structure, the rear mold of the double-color injection mold is provided with two rear mold cavities, the front mold of the double-color injection mold is provided with two front mold cores, and the two rear mold cavities can be respectively matched with the two front mold cores. The injection molding process of the bicolor product piece is divided into two stages, namely, firstly, the hard rubber part 51 (see fig. 1) is injection molded, the hard rubber part is left in the rear mold after mold opening, the rear mold is driven by the injection molding machine to rotate 180 degrees and then is matched with the front mold, the rear mold cavity with the hard rubber part is matched with the other front mold core to form a soft injection cavity, and after soft rubber is injected, the soft rubber is combined with the hard rubber part 51 molded in advance to form the bicolor product piece (see fig. 2).
The bicolor product piece is composed of a hard rubber part 51 and a soft rubber part 52, wherein the soft rubber part 52 is attached to the outer wall of the hard rubber part 51 in a normal case, and can be formed through injection molding on two sides. According to the product requirement, the combination firmness of the soft rubber part 52 and the hard rubber part 51 is improved, the soft rubber part 52 is required to be partially embedded into the hard rubber part 51, the hard rubber part 51 which is required to be formed in advance is provided with a caulking groove capable of being filled with soft rubber, when soft rubber is driven in, the soft rubber is required to be filled into the caulking groove of the hard rubber part 51 which is required to be formed, the required requirement of the double-color product piece cannot be met by the structure of the conventional double-color injection mold. Accordingly, the prior art is further improved.
Disclosure of Invention
Aiming at the defects of the prior art, the invention aims to provide a double-color injection mold with a blade-changing core-pulling component, and solves the problem that the conventional double-color injection mold cannot realize the requirement that a soft rubber part of a double-color product part is embedded into a hard rubber part.
In order to solve the technical problems, the invention adopts the following technical scheme:
the double-color injection mold with the blade core-pulling changing assembly comprises a front mold and a rear mold, wherein two front mold cores are arranged on the front mold, and a first rear mold cavity and a second rear mold cavity are arranged on the rear mold.
Two groups of conversion core-pulling assemblies are symmetrically arranged at two ends of each rear mold cavity, each conversion core-pulling assembly comprises hard rubber core-pulling and soft rubber core-pulling, and the hard rubber core-pulling is arranged along the mold opening direction.
The hard rubber core-pulling device is characterized in that a hard rubber core-pulling head is arranged at one end of the hard rubber core-pulling head, which is close to the rear mold cavity, and a hard rubber core-pulling oil cylinder is arranged at one end of the hard rubber core-pulling head, which is far away from the rear mold cavity, and drives the hard rubber core-pulling head to move along the mold opening direction.
The soft rubber core pulling is positioned on one side of the hard rubber core pulling, and the soft rubber core pulling is obliquely arranged relative to the mold opening direction.
The soft rubber core-pulling device is characterized in that a soft rubber core-pulling head is arranged at one end of the soft rubber core-pulling head, which is close to the rear mold cavity, and a soft rubber core-pulling oil cylinder is arranged at one end of the soft rubber core-pulling head, which is far away from the rear mold cavity, and drives the soft rubber core-pulling head to move along an inclined direction relative to the mold opening direction.
Further, the transformation core-pulling assembly comprises a hard rubber locking core-pulling device, and the hard rubber locking core-pulling device is located at one side of the hard rubber core-pulling device, which is away from the soft rubber core-pulling device.
One end of the hard rubber locking core pulling is in plug-in fit with the hard rubber core pulling, and the other end of the hard rubber locking core pulling is provided with a first locking oil cylinder.
Further, the hard rubber locking loose core is arranged along the direction perpendicular to the die opening direction.
Core pulling jacks are formed in the middle of the hard rubber core pulling, and the core pulling jacks are matched with one end of the hard rubber locking core pulling.
The first locking oil cylinder can drive the hard rubber to lock and loose core to move, so that the end part of the first locking oil cylinder is inserted into a loose core jack of the hard rubber loose core.
Further, the transformation core-pulling assembly further comprises a soft rubber locking core-pulling device, and the soft rubber locking core-pulling device is located at one side of the soft rubber core-pulling device, which is away from the hard rubber core-pulling device.
One end of the soft rubber locking core pulling is in plug-in fit with the soft rubber core pulling, and the other end of the soft rubber locking core pulling is provided with a second locking oil cylinder.
Further, the soft rubber locking loose core is arranged along the direction perpendicular to the mold opening direction.
Square notch is set at one end of the soft rubber locking loose core, and a slot is set at two sides of the middle of the soft rubber loose core.
The second locking oil cylinder can drive the flexible glue to lock and loose core, so that the parts of the second locking oil cylinder positioned at two sides of the square notch are inserted into the corresponding slots.
Further, one side of each hard rubber core pulling is provided with a stroke control mechanism, and one side of each soft rubber core pulling is also provided with the same stroke control mechanism.
The stroke control mechanism comprises a driving rod, a collision block and two stroke switches, one end of the driving rod is fixedly connected with the corresponding loose core, and the other end of the driving rod is fixedly connected with the collision block.
The two travel switches are arranged on the side wall of the rear die at intervals along the corresponding core pulling movement direction, and the collision block is positioned between the two travel switches.
Further, the hydraulic system further comprises four oil ways, namely a first oil way, a second oil way, a third oil way and a fourth oil way.
The first oil way is simultaneously oil supply and oil return for two first locking oil cylinders corresponding to the first back model cavity and two second locking oil cylinders corresponding to the second back model cavity, and the second oil way is simultaneously oil supply and oil return for two second locking oil cylinders corresponding to the first back model cavity and two first locking oil cylinders corresponding to the second back model cavity.
The third oil way is used for supplying oil and returning oil to the two hard rubber core-pulling oil cylinders corresponding to the first back model cavity and the two soft rubber core-pulling oil cylinders corresponding to the second back model cavity at the same time, and the fourth oil way is used for supplying oil and returning oil to the two soft rubber core-pulling oil cylinders corresponding to the first back model cavity and the two hard rubber core-pulling oil cylinders corresponding to the second back model cavity at the same time.
Further, one end of the hard rubber core-pulling head and the corresponding hard rubber core-pulling head are fixed into an integrated structure, and one end of the soft rubber core-pulling head and the corresponding soft rubber core-pulling head are fixed into an integrated structure.
Another object of the present invention is to provide a working method of the above-mentioned double-color injection mold with the insert core pulling assembly.
The working method of the double-color injection mold with the changeable blade core-pulling assembly comprises the following steps:
in the initial state, the front mold and the rear mold are in a first mold closing state, and the first rear mold cavity is matched with one of the front mold cores to form a hard rubber injection cavity.
Before the front mould and the rear mould are assembled for the first time, two hard glue core-pulling ejection corresponding to the first rear mould cavity are carried out, and one ends of two hard glue locking core-pulling corresponding to the first rear mould cavity are respectively inserted into the corresponding hard glue core-pulling ends to lock the corresponding hard glue core-pulling ends.
And secondly, after the first mold closing, injecting hard rubber into the hard rubber injection cavity by the injection molding machine, and cooling the hard rubber to form a hard rubber part.
After the hard rubber part is molded, the front mold and the rear mold are opened for the first time, the front mold is not moved, the hard rubber part is left in the cavity of the first rear mold and then moves together, and after the first mold opening is completed, the rear mold rotates 180 degrees.
After the rotation of the rear mold is completed, the first rear mold cavity and the hard rubber part correspond to the other front mold core.
And thirdly, synchronously withdrawing the core-pulling jacks of the corresponding hard glue core-pulling with the locking core-pulling of the two hard glue corresponding to the first back model cavity, and synchronously withdrawing the core-pulling of the two hard glue corresponding to the first back model cavity.
After the two soft rubber core-pulling cores corresponding to the first back mold cavity are synchronously ejected, the ends of the two soft rubber locking core-pulling cores corresponding to the first back mold cavity are respectively inserted into the corresponding soft rubber core-pulling slots, and the corresponding soft rubber core-pulling cores are locked.
And fourthly, after the front mould and the rear mould are closed for the second time, the first rear mould cavity, the hard rubber part and the other front mould core are matched to form a soft rubber injection cavity, and the soft rubber is injected into the soft rubber injection cavity by an injection molding machine.
And after the soft rubber is cooled and molded, forming a bicolor product piece with an integrated structure with the hard rubber part.
And fifthly, synchronously withdrawing the two soft rubber locking loose cores corresponding to the first back model cavity, and synchronously withdrawing the two soft rubber loose cores corresponding to the first back model cavity.
The front mold and the rear mold are opened for the second time, the two-color product piece moves together with the rear mold, and the ejection system of the rear mold acts to eject the two-color product piece.
And step six, after the bicolor product piece is ejected, the two hard glue core-pulling cores corresponding to the first back mold cavity are synchronously ejected. And then, two hard glue locking core-pulling ejectors corresponding to the first back model cavity are inserted into the core-pulling jacks of the corresponding hard glue core-pulling to lock the core-pulling jacks, and the initial state of the step one is returned.
By adopting the technical scheme, the invention has the beneficial technical effects that: the invention adopts the hard rubber part of the hard rubber core-pulling molding double-color product piece and the soft rubber part of the soft rubber core-pulling molding double-color product piece, and solves the problem that the soft rubber part is embedded into the hard rubber part by adopting a mode of alternately ejecting the hard rubber core-pulling and the hard rubber core-pulling. The reasonable oil way arrangement mode is adopted, the core pulling of the core pulling assemblies of different groups is shared by the same oil way, and the oil ways are synchronously matched, so that the oil way structure and the number of main oil ways are simplified, the core pulling control is simpler and more convenient, the cost is lower, and the selection requirement on the injection molding machine is reduced.
Drawings
A partial structural illustration of a previously formed hard gum portion is indicated in the background of fig. 1.
Fig. 2 is a partial schematic of the structure of a two-color product piece as indicated in the background art.
Fig. 3 is a schematic structural diagram of the inventive core-pulling conversion assembly in a hard rubber injection molding state.
Fig. 4 is a schematic structural diagram of the conversion core-pulling assembly of the invention in a soft rubber injection molding state.
Fig. 5 is a schematic view of a portion of the invention of fig. 3, showing the hard-face loose core and associated components.
Fig. 6 is a schematic structural view of a portion of the invention of fig. 4, showing the flexible glue core and associated components.
Detailed Description
The invention is described in detail below with reference to the attached drawing figures:
embodiment 1, with reference to fig. 3 to 6, a two-color injection mold with a core-pulling assembly of a conversion blade includes a front mold and a rear mold, both of which are provided on an injection molding machine, the front mold being a fixed mold, and the rear mold being a fixed mold. The front mold is provided with two front mold cores, the rear mold is provided with two rear mold cavities, namely a first rear mold cavity and a second rear mold cavity, and each front mold core can be matched with the first rear mold cavity and the second rear mold cavity. Two groups of transformation core-pulling assemblies are symmetrically arranged at two ends of each rear mold cavity, and each group of transformation core-pulling assemblies are arranged in the rear mold.
The transformation core-pulling assembly comprises a hard rubber core-pulling 11 and a soft rubber core-pulling 12, and the hard rubber core-pulling 11 is arranged along the die opening direction. The hard rubber core-pulling head 13 is arranged at one end of the hard rubber core-pulling head 11, which is close to the rear model cavity, and one end of the hard rubber core-pulling head 13 and the corresponding hard rubber core-pulling head 11 are fixed into an integrated structure, and the end part of the hard rubber core-pulling head 13 can extend into the corresponding rear model cavity. The hard rubber core-pulling cylinder 31 is arranged at one end of the hard rubber core-pulling 11, which is far away from the rear mold cavity, and the hard rubber core-pulling cylinder 31 drives the hard rubber core-pulling 11 to move along the mold opening direction, so that ejection and retraction of the hard rubber core-pulling 11 and the hard rubber core-pulling head 13 are realized.
The transformation core-pulling assembly comprises a hard rubber locking core-pulling 21, wherein the hard rubber locking core-pulling 21 is positioned on one side of the hard rubber core-pulling 11, which is away from the soft rubber core-pulling 12, and the hard rubber locking core-pulling 21 is arranged along a direction perpendicular to the die opening direction. One end of the hard rubber locking core-pulling 21 is fixedly provided with a plug 211, the plug 211 is of a wedge-shaped structure, the hard rubber locking core-pulling 21 is in plug-in fit with the hard rubber core-pulling 11 through the plug 211 at the end part of the plug 211, the other end of the hard rubber locking core-pulling 21 is provided with a first locking oil cylinder 33, and the telescopic end of the first locking oil cylinder 33 drives the hard rubber locking core-pulling 21 to eject or retract along the direction perpendicular to the die opening direction. In the ejection state of the hard rubber core-pulling 11, the end part of the hard rubber core-pulling head 13 is positioned in the corresponding rear mold cavity, and the end part of the hard rubber core-pulling head 13 can form a soft rubber caulking groove on the hard rubber part.
The middle part of the hard rubber core-pulling 11 is provided with a core-pulling jack with a conical structure, and the core-pulling jack is matched with a plug 211 at one end of the hard rubber locking core-pulling 21. When the hard rubber core-pulling 11 is in an ejection state, the plug 211 at one end of the hard rubber locking core-pulling 21 corresponds to the core-pulling jack corresponding to the hard rubber core-pulling 11 in the forward direction, the first locking oil cylinder 33 drives the hard rubber locking core-pulling 21 to move towards the hard rubber core-pulling 11, the plug 211 at the end part of the hard rubber locking core-pulling 21 is inserted into the core-pulling jack of the hard rubber core-pulling 11, the hard rubber core-pulling 11 is locked, and the hard rubber is prevented from being ejected back by the pressure of the hard rubber when the hard rubber is driven into the hard rubber injection cavity.
The soft rubber core-pulling 12 is positioned at one side of the hard rubber core-pulling 11, and the soft rubber core-pulling 12 is obliquely arranged relative to the mold opening direction. The end of the soft rubber core-pulling head 14, which is close to the rear model cavity, is provided with a soft rubber core-pulling head 14, one end of the soft rubber core-pulling head 14 and the corresponding soft rubber core-pulling head 12 are fixed into an integrated structure, and the end part of the soft rubber core-pulling head 14 can extend into the corresponding rear model cavity. The end of the soft rubber core-pulling 12, which is far away from the rear mold cavity, is provided with a soft rubber core-pulling oil cylinder 32, and the soft rubber core-pulling oil cylinder 32 drives the soft rubber core-pulling 12 to move along an inclined direction relative to the mold opening direction.
The transformation core-pulling assembly further comprises a soft rubber locking core-pulling 22, wherein the soft rubber locking core-pulling 22 is positioned on one side of the soft rubber core-pulling 12, which is away from the hard rubber core-pulling 11, and the soft rubber locking core-pulling 22 is arranged along a direction perpendicular to the mold opening direction. One end of the soft rubber locking core pulling 22 is in plug-in fit with the soft rubber core pulling 12, the other end of the soft rubber locking core pulling 22 is provided with a second locking oil cylinder 34, and the telescopic end of the second locking oil cylinder 34 drives the soft rubber locking core pulling 22 to eject or retract along the direction perpendicular to the mold opening direction. In the ejection state of the soft rubber core-pulling 11, the end part of the hard rubber core-pulling head 13 is positioned in the corresponding back mold cavity, the end part of the hard rubber core-pulling head 13 plugs one side of the soft rubber caulking groove of the hard rubber part, and after soft rubber injection and cooling molding, the required double-color product piece is obtained.
Square notch 221 is provided at one end of the flexible glue locking core-pulling 22, two opposite sides of the middle part of the flexible glue core-pulling 12 are respectively provided with a slot 121, and the parts of the flexible glue locking core-pulling 22 at two sides of the square notch 221 can be respectively matched with the slots 121 at two sides of the flexible glue core-pulling 12. The second locking cylinder 34 can drive the flexible glue locking core pulling 22 to move, so that the parts of the flexible glue locking core pulling 22 positioned at two sides of the square notch 221 are inserted into the corresponding slots 121. When the soft rubber core-pulling 12 is in an ejection state, the square notch 221 at the end part of the soft rubber locking core-pulling 22 corresponds to the slot 121 in the middle of the soft rubber core-pulling 12 in the forward direction, the second locking oil cylinder 34 drives the soft rubber locking core-pulling 22 to move towards the soft rubber core-pulling 12, the parts of the soft rubber locking core-pulling 22 positioned at the two sides of the square notch 221 are inserted into the slots 121 at the two sides of the soft rubber core-pulling 12, the soft rubber core-pulling 12 is locked, and the soft rubber is prevented from being ejected back by the pressure of soft rubber when the soft rubber is driven into the soft rubber injection cavity.
One side of each hard rubber core pulling 11 is provided with a stroke control mechanism 4, and one side of each soft rubber core pulling 12 is also provided with the same stroke control mechanism 4. The stroke control mechanism 4 comprises a driving rod 41, a collision block 42 and two stroke switches 43, wherein one end of the driving rod 41 is fixedly connected with the corresponding loose core, and the other end of the driving rod is fixedly connected with the collision block 42. The two travel switches 43 are arranged on the side wall of the rear mold at intervals along the corresponding core pulling movement direction, and the ram 42 is located between the two travel switches 43. The signal end of each travel switch 43 is electrically connected with the control system of the injection molding machine and is powered by the power distribution system of the injection molding machine. In the working state, each driving rod 41 and the collision block 42 synchronously move along with the corresponding hard rubber core pulling 11 or soft rubber core pulling 12, and the stroke of the hard rubber core pulling 11 or soft rubber core pulling 12 is controlled by matching the collision block 42 with the two stroke switches 43.
The double-color injection mold with the blade core-pulling changing assembly further comprises four oil ways, namely a first oil way, a second oil way, a third oil way and a fourth oil way, wherein the four oil ways are respectively connected with a hydraulic station of the injection molding machine, and the hydraulic station can be used for supplying oil and returning oil for the four oil ways.
The two first locking cylinders 33 corresponding to the first back model cavity and the two second locking cylinders 34 corresponding to the second back model cavity are connected in parallel and then are used as a whole, and then are connected in series on a first oil path, and the first oil path simultaneously supplies oil and returns oil for the two first locking cylinders 33 corresponding to the first back model cavity and the two second locking cylinders 34 corresponding to the second back model cavity. The two second locking cylinders 34 corresponding to the first back model cavity and the two first locking cylinders 33 corresponding to the second back model cavity are connected in parallel and then are used as a whole, and then are connected in series on a second oil path, and the second oil path simultaneously supplies oil and returns oil for the two second locking cylinders 34 corresponding to the first back model cavity and the two first locking cylinders 33 corresponding to the second back model cavity.
The two hard rubber core-pulling oil cylinders 31 corresponding to the first back model cavity and the two soft rubber core-pulling oil cylinders 32 corresponding to the second back model cavity are connected in parallel and then are used as a whole, and then are connected in series on a third oil way, and the third oil way simultaneously supplies oil and returns oil for the two hard rubber core-pulling oil cylinders 31 corresponding to the first back model cavity and the two soft rubber core-pulling oil cylinders 32 corresponding to the second back model cavity. The two soft rubber core-pulling oil cylinders 32 corresponding to the first back model cavity and the two hard rubber core-pulling oil cylinders 31 corresponding to the second back model cavity are simultaneously supplied with oil and return oil. Through the oil way arrangement mode, the oil way structure is greatly simplified, the limit on the number of oil way ports of the injection molding machine is reduced, and the universality of equipment is improved.
The core-pulling head of the bicolor injection mold with the changeable blade core-pulling assembly is also called a blade.
Embodiment 2, with reference to fig. 2 to 5, the working method of the bicolor injection mold with the replaceable blade core-pulling assembly comprises the following steps:
in the initial state, the front mold and the rear mold are in a first mold closing state, and the first rear mold cavity is matched with one of the front mold cores to form a hard rubber injection cavity. The second back mold cavity is matched with the other front mold core and the hard rubber part formed in the previous working procedure in the second back mold cavity to form a soft rubber injection cavity.
Before the front mould and the rear mould are assembled for the first time, two hard glue core-pulling cores 11 corresponding to the first rear mould cavity are ejected, one ends of two hard glue locking core-pulling cores 21 corresponding to the first rear mould cavity are respectively inserted into the corresponding hard glue core-pulling cores 11, and the corresponding hard glue core-pulling cores 11 are locked. The two soft rubber core-pulling cores 12 corresponding to the first back mold cavity are in a retreated state, and the two soft rubber locking core-pulling cores 22 corresponding to the first back mold cavity are also in a retreated state.
Before the front mold and the rear mold are assembled for the first time, the hard rubber product molded in the previous process is left in the second rear mold cavity, two soft rubber core-pulling cores 12 corresponding to the second rear mold cavity are ejected, one ends of two soft rubber locking core-pulling cores 22 corresponding to the first rear mold cavity are respectively inserted into the corresponding soft rubber core-pulling cores 12, and the corresponding soft rubber core-pulling cores 12 are locked. The two hard rubber core-pulling cores 11 corresponding to the first back mold cavity are in a retreated state, and the two hard rubber locking core-pulling cores 21 corresponding to the first back mold cavity are also in a retreated state.
And secondly, after the first mold closing, injecting hard rubber into the hard rubber injection cavity by the injection molding machine, and cooling the hard rubber to form a hard rubber part in the current working procedure. And (3) injecting soft rubber into the soft rubber injection cavity by the injection molding machine, combining the soft rubber with the hard rubber part of the previous procedure, and cooling to form the bicolor product piece of the previous procedure.
The front mold and the rear mold are opened for the first time, the front mold is not moved, the hard glue part of the process and the double-color product part of the previous process move together, and after the first mold opening is completed, the ejection system of the rear mold acts to eject the double-color product part of the previous process.
And then, the rear mould rotates 180 degrees, after the rear mould rotates, the first rear mould cavity and the hard glue part correspond to the other front mould core, the first rear mould cavity corresponds to one of the front mould cores, and the second mould closing is prepared.
And step three, before the front mould and the rear mould are closed for the second time, after the two hard glue locking core-pulling cores 21 corresponding to the first rear mould cavity synchronously exit the core-pulling jack of the corresponding hard glue core-pulling 11, the two hard glue core-pulling cores 11 corresponding to the first rear mould cavity synchronously retract.
Then, the two soft rubber core-pulling cores 12 corresponding to the first back mold cavity are synchronously ejected, and the end parts of the two soft rubber locking core-pulling cores 22 corresponding to the first back mold cavity are respectively inserted into the slots 121 of the corresponding soft rubber core-pulling cores 12 to lock the corresponding soft rubber core-pulling cores 12.
Before the front mold and the rear mold are closed for the second time, after the two soft rubber locking core-pulling cores 22 corresponding to the second rear mold cavity synchronously withdraw from the corresponding slots 121 of the soft rubber core-pulling cores 12, the two soft rubber core-pulling cores 12 corresponding to the first rear mold cavity synchronously withdraw.
Then, the two hard rubber core-pulling cores 11 corresponding to the second back mold cavity are synchronously ejected, and the end parts of the two hard rubber locking core-pulling cores 21 corresponding to the second back mold cavity are respectively inserted into the core-pulling insertion holes of the corresponding hard rubber core-pulling cores 11 to lock the corresponding hard rubber core-pulling cores 11.
And fourthly, after the front mould and the rear mould are closed for the second time, the first rear mould cavity, the hard rubber part and the other front mould core are matched to form a soft rubber injection cavity, soft rubber is injected into the soft rubber injection cavity by an injection molding machine, and after the soft rubber is cooled and molded, a double-color product part of the process is formed with the hard rubber part. Simultaneously, the second back model cavity and one of the front model cores are matched to form a hard rubber injection cavity, the injection molding machine drives hard rubber into the hard rubber injection cavity, and after the hard rubber is cooled and molded, a hard rubber part of the later procedure is formed.
And fifthly, synchronously withdrawing the two soft rubber locking loose cores 22 corresponding to the first back model cavity, and synchronously withdrawing the two hard rubber locking loose cores 21 corresponding to the second back model cavity. Then, the two soft rubber core-pulling cores 12 corresponding to the first back model cavity synchronously retract, and the two hard rubber core-pulling cores 11 corresponding to the second back model cavity synchronously retract.
The front mold and the rear mold are opened for the second time, the double-color product piece in the current process and the hard rubber part in the subsequent process move together, the ejection system of the rear mold acts to eject the double-color product piece in the current process, and the hard rubber part in the subsequent process is left in the rear mold.
Step six, after the bicolor product piece in the process is ejected, the two hard rubber core-pulling cores 11 corresponding to the first back model cavity are synchronously ejected, and meanwhile, the two soft rubber core-pulling cores 12 corresponding to the second back model cavity are synchronously ejected. Subsequently, the two hard rubber locking core-pulling cores 21 corresponding to the first rear mold cavity are ejected, the corresponding hard rubber core-pulling cores 11 are locked, and simultaneously, the two soft rubber locking core-pulling cores 22 corresponding to the second rear mold cavity are synchronously ejected, and the corresponding soft rubber core-pulling cores 12 are locked. And (3) clamping the front die and the rear die, and returning to the initial state of the first die clamping in the step one.
The parts not described in the invention can be realized by adopting or referring to the prior art.
In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, are merely for convenience in describing the present invention and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present invention.
Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
It should be understood that the above description is not intended to limit the invention to the particular embodiments disclosed, but to limit the invention to the particular embodiments disclosed, and that the invention is not limited to the particular embodiments disclosed, but is intended to cover modifications, adaptations, additions and alternatives falling within the spirit and scope of the invention.

Claims (9)

1. The double-color injection mold with the core-pulling changing assembly comprises a front mold and a rear mold, and is characterized in that two front mold cores are arranged on the front mold, and a first rear mold cavity and a second rear mold cavity are arranged on the rear mold;
two groups of conversion core-pulling assemblies are symmetrically arranged at two ends of each rear mold cavity, each conversion core-pulling assembly comprises a hard rubber core-pulling assembly and a soft rubber core-pulling assembly, and the hard rubber core-pulling assemblies are arranged along the mold opening direction;
the hard rubber core-pulling device comprises a rear mold cavity, a hard rubber core-pulling head, a hard rubber core-pulling cylinder and a hard rubber core-pulling cylinder, wherein the hard rubber core-pulling head is arranged at one end of the hard rubber core-pulling head, which is close to the rear mold cavity, and the hard rubber core-pulling cylinder is arranged at one end of the hard rubber core-pulling head, which is far away from the rear mold cavity, so that the hard rubber core-pulling cylinder drives the hard rubber core to move along the mold opening direction;
the soft rubber core pulling device is characterized in that the soft rubber core pulling device is arranged on one side of the hard rubber core pulling device, and the soft rubber core pulling device is obliquely arranged relative to the die opening direction;
the soft rubber core-pulling device is characterized in that a soft rubber core-pulling head is arranged at one end of the soft rubber core-pulling head, which is close to the rear mold cavity, and a soft rubber core-pulling oil cylinder is arranged at one end of the soft rubber core-pulling head, which is far away from the rear mold cavity, and drives the soft rubber core-pulling head to move along an inclined direction relative to the mold opening direction.
2. The double-shot injection mold with the conversion core-pulling assembly according to claim 1, wherein the conversion core-pulling assembly comprises a hard rubber locking core-pulling device, and the hard rubber locking core-pulling device is positioned on one side of the hard rubber core-pulling device, which is away from the soft rubber core-pulling device;
one end of the hard rubber locking core pulling is in plug-in fit with the hard rubber core pulling, and the other end of the hard rubber locking core pulling is provided with a first locking oil cylinder.
3. The double-shot injection mold with a conversion core-pulling assembly according to claim 2, wherein the hard-adhesive locking core-pulling is arranged along a direction perpendicular to the mold opening direction;
a core pulling jack is formed in the middle of the hard rubber core pulling, and the core pulling jack is matched with one end of the hard rubber locking core pulling;
the first locking oil cylinder can drive the hard rubber to lock and loose core to move, so that the end part of the first locking oil cylinder is inserted into a loose core jack of the hard rubber loose core.
4. The double-shot injection mold with the conversion core-pulling assembly according to claim 2, wherein the conversion core-pulling assembly further comprises a soft rubber locking core-pulling device, and the soft rubber locking core-pulling device is positioned on one side of the soft rubber core-pulling device, which is away from the hard rubber core-pulling device;
one end of the soft rubber locking core pulling is in plug-in fit with the soft rubber core pulling, and the other end of the soft rubber locking core pulling is provided with a second locking oil cylinder.
5. The dual-color injection mold with a transformation core pulling assembly according to claim 4, wherein the soft rubber locking core pulling is arranged along a direction perpendicular to a mold opening direction;
a square notch is formed in one end of the soft rubber locking core pulling device, and a slot is formed in two sides of the middle of the soft rubber core pulling device respectively;
the second locking oil cylinder can drive the flexible glue to lock and loose core, so that the parts of the second locking oil cylinder positioned at two sides of the square notch are inserted into the corresponding slots.
6. The double-shot injection mold with the changeable core-pulling assembly according to claim 1, wherein one side of each hard rubber core-pulling is provided with a stroke control mechanism, and one side of each soft rubber core-pulling is also provided with the same stroke control mechanism;
the stroke control mechanism comprises a driving rod, a collision block and two stroke switches, one end of the driving rod is fixedly connected with the corresponding loose core, and the other end of the driving rod is fixedly connected with the collision block;
the two travel switches are arranged on the side wall of the rear die at intervals along the corresponding core pulling movement direction, and the collision block is positioned between the two travel switches.
7. The double-shot injection mold with a core-pulling conversion assembly according to claim 4, further comprising four oil passages, namely a first oil passage, a second oil passage, a third oil passage and a fourth oil passage;
the first oil way is used for supplying oil and returning oil to two first locking oil cylinders corresponding to the first back model cavity and two second locking oil cylinders corresponding to the second back model cavity at the same time, and the second oil way is used for supplying oil and returning oil to two second locking oil cylinders corresponding to the first back model cavity and two first locking oil cylinders corresponding to the second back model cavity at the same time;
the third oil way is used for supplying oil and returning oil to the two hard rubber core-pulling oil cylinders corresponding to the first back model cavity and the two soft rubber core-pulling oil cylinders corresponding to the second back model cavity at the same time, and the fourth oil way is used for supplying oil and returning oil to the two soft rubber core-pulling oil cylinders corresponding to the first back model cavity and the two hard rubber core-pulling oil cylinders corresponding to the second back model cavity at the same time.
8. The double-shot injection mold with the core-pulling conversion assembly according to claim 1, wherein one end of the hard rubber core-pulling head and the corresponding hard rubber core-pulling head are fixed into an integral structure, and one end of the soft rubber core-pulling head and the corresponding soft rubber core-pulling head are fixed into an integral structure.
9. A method of operating a bicolor injection mold with a variable core back assembly as claimed in any one of claims 1 to 8, comprising the steps of:
step one, in an initial state, a front mold and a rear mold are in a first mold closing state, and a first rear mold cavity is matched with one of front mold cores to form a hard rubber injection cavity;
before the front mould and the rear mould are closed for the first time, two hard glue core-pulling cores corresponding to the first rear mould cavity are ejected, one ends of two hard glue locking core-pulling cores corresponding to the first rear mould cavity are respectively inserted into the corresponding hard glue core-pulling cores, and the corresponding hard glue core-pulling cores are locked;
step two, after the first mold closing, injecting hard rubber into the hard rubber injection cavity by the injection molding machine, and cooling the hard rubber to form a hard rubber part; after the hard rubber part is molded, the front mold and the rear mold are opened for the first time, the front mold is not moved, the hard rubber part is left in the cavity of the first rear mold and then moves together, and after the first mold opening is completed, the rear mold rotates for 180 degrees;
after the rotation of the rear mold is completed, the first rear mold cavity and the hard rubber part correspond to the other front mold core;
step three, two hard glue locking core-pulling corresponding to the first back model cavity synchronously withdraw from the corresponding core-pulling jack of the hard glue core-pulling, and two hard glue core-pulling corresponding to the first back model cavity synchronously withdraw;
after the two soft rubber core-pulling cores corresponding to the first back mold cavity are synchronously ejected, the ends of the two soft rubber locking core-pulling cores corresponding to the first back mold cavity are respectively inserted into the corresponding soft rubber core-pulling slots, and the corresponding soft rubber core-pulling cores are locked;
step four, after the front mould and the rear mould are closed for the second time, the first rear mould cavity, the hard rubber part and the other front mould core are matched to form a soft rubber injection cavity, and the soft rubber is injected into the soft rubber injection cavity by an injection molding machine;
after the soft rubber is cooled and molded, a bicolor product part with an integrated structure is formed with the hard rubber part;
step five, synchronously withdrawing the two soft rubber locking loose cores corresponding to the first back model cavity, and then synchronously withdrawing the two soft rubber loose cores corresponding to the first back model cavity;
the front mold and the rear mold are opened for the second time, the two-color product piece moves together with the rear mold, and the ejection system of the rear mold ejects the two-color product piece;
step six, after the bicolor product piece is ejected, two hard glue core-pulling cores corresponding to the first back mold cavity are synchronously ejected; and then, two hard glue locking core-pulling ejectors corresponding to the first back model cavity are inserted into the core-pulling jacks of the corresponding hard glue core-pulling to lock the core-pulling jacks, and the initial state of the step one is returned.
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