CN217553021U - Injection mold with in-mold extrusion forming function - Google Patents

Abstract

The utility model discloses an injection mold with extrusion function in mould. The utility model discloses an injection mold, which comprises an upper mold and a lower mold, wherein the upper mold and the lower mold can be mutually matched; an extrusion insert is arranged on the lower die; the extrusion insert is movably arranged on the lower die and can be extruded and extended or retracted towards the upper die in a reverse direction. Adopt the utility model discloses an injection mold with interior extrusion function carries out the in-process of moulding plastics of injection molding, behind the injection mold cavity is filled to the plastic, it can stretch and carry out thin-walled extrusion to extrude the mold insert to realize the injection moulding who has thin wall construction's injection molding, eliminated adverse effect such as striae, need not gong once more and mill processing, production efficiency is high, with low costs. In addition, the extrusion insert is driven by an oil cylinder to extend and extrude, so that the forming of a thin-wall structure can be effectively ensured, and the wall thickness of a local thin wall is small.

Description

Injection mold with in-mold extrusion forming function

Technical Field

The utility model relates to an injection mold technical field, concretely relates to injection mold with extrusion function in mould.

Background

In the injection molding production of the traditional injection molding part, an injection mold cavity corresponding to a finished product is arranged on an injection mold, and injection molding glue is injected into the injection mold cavity after mold closing to form the injection molding part.

For injection molding part products with local pit thin-wall structures, if the corresponding protruding structures corresponding to the pits are designed on the injection mold and direct integral injection molding is carried out, during the injection molding of plastic liquid, due to the interference effect of the protruding structures, the injection molded products have flow marks and the like, and the attractiveness of the products is seriously affected. Moreover, the traditional local thin-wall technology of the plastic part can only achieve 0.75 time of the wall thickness, and the appearance of the surface with a large local thin-wall area has a bonding line, so that the appearance is influenced. The prior treatment method needs to machine the corresponding pit slot position by CNC after injection molding, but causes the machining process to become complicated, reduces the production efficiency and greatly increases the production cost and the equipment cost.

SUMMERY OF THE UTILITY MODEL

The utility model aims at solving injection mold among the prior art and can't direct injection moulding or the shaping quality low to the injection molding that has thin wall structure such as pit, and adopt the back gong of moulding plastics to mill and handle and have the problem that the process is complicated, production efficiency is low and with high costs, provide an injection mold with interior extrusion function. The injection mold with the in-mold extrusion forming function is provided with the extrusion insert, and can be used for directly extruding and forming a corresponding thin-wall structure in the injection molding process of an injection molding part, so that the direct injection molding of the injection molding part with a complex structure is realized.

The purpose of the utility model is realized through the following technical scheme.

An injection mold with an in-mold extrusion forming function comprises an upper mold and a lower mold, wherein the upper mold and the lower mold can be mutually matched; an extrusion insert is arranged on the lower die;

the extrusion insert is movably arranged on the lower die and can be extruded and extended or retracted reversely towards the upper die.

In a preferred embodiment, a compression drive is provided; the extrusion driving piece is in transmission connection with the extrusion insert and can drive the extrusion insert to extend and retract.

In a more preferred embodiment, the extrusion driving member is in transmission connection with the extrusion insert through a connection fixing plate.

In a further preferred embodiment, the connecting and fixing plate is arranged on the lower die holder; and a buffer part is arranged between the connecting and fixing plate and the lower die base.

In a more preferred embodiment, in the injection mold with in-mold extrusion molding function described in any one of the above, the extrusion driving member is an oil cylinder, and is provided with an oil passage communicated with the oil cylinder.

In a preferred embodiment, the injection mold with in-mold extrusion molding function as described in any one of the above embodiments, the lower mold has an injection mold cavity and a runner communicating with the injection mold cavity; the extrusion inserts correspondingly extend or retract from the plane defined by the injection mold cavity.

In a preferred embodiment, the injection mold with in-mold extrusion molding function described in any one of the above, the lower mold is disposed on a lower mold base; the lower die base is provided with a die opening thimble, and the die opening thimble is movably arranged on the lower die base and can be ejected towards the upper die or retracted reversely; and when the die opening thimble ejects towards the upper die, the upper die can be demoulded from the lower die.

In a more preferable embodiment, the mold opening thimble is arranged on the lower die base through a thimble mounting plate; the thimble mounting panel can be in along being close to or keeping away from on the die holder the direction of going up the mould removes, the die sinking thimble is installed on the thimble mounting panel and can follow the thimble mounting panel removes.

In a further preferred embodiment, in the injection mold with the in-mold extrusion molding function, a reset piece is disposed between the thimble mounting plate and the lower die base.

In a preferred embodiment, the injection mold with in-mold extrusion molding function as described in any one of the above, the upper mold is disposed on the upper mold base.

Compared with the prior art, the utility model has the advantages of as follows and beneficial effect:

the utility model discloses an among the injection mold with interior extrusion function, be provided with the mold insert of extruding that stretches out or retracts in the plane that the injection mold chamber of follow lower mould is injectd, the in-process of moulding plastics of injection molding, after the injection mold chamber is filled to the plastic, it can stretch out and carry out thin-walled extrusion to extrude the mold insert, thereby realize the injection moulding of the injection molding that has thin wall construction, adverse effect such as flow line has been eliminated, and for the disposable direct forming that moulds plastics, and need not gong and mill once more, high production efficiency, and low cost.

The extrusion insert is preferably driven by an oil cylinder to extend and extrude, so that the forming of a thin-wall structure can be effectively ensured, the wall thickness of a local thin wall can reach less than 0.5 time of that of an injection molding part, and the appearance of the injection molding part is not affected.

Drawings

Fig. 1 is a schematic perspective view of an injection mold with an in-mold extrusion molding function according to an embodiment of the present invention;

FIG. 2 is a schematic front view of an injection mold with an in-mold extrusion molding function according to an embodiment of the present invention;

FIG. 3 is a schematic perspective view of the lower die holder;

FIG. 4 is a schematic view of the internal structure of the lower die holder;

FIG. 5 is a schematic cross-sectional view of the lower die holder;

FIG. 6 is a perspective view of the lower mold and the extrusion driving member;

FIG. 7 is a sectional view of the lower die and the extrusion driving member;

the attached drawings are marked as follows: 1-upper die holder, 2-lower die holder, 201-holder base plate, 202-holder top plate, 3-lower die, 301-injection die cavity, 302-runner, 303-injection gate, 4-extrusion insert, 41-extrusion square insert, 42-extrusion round insert, 5-extrusion driving piece, 6-connection fixing plate, 61-fixing panel, 62-fixing base plate, 7-buffer piece, 8-oil way, 9-oil nozzle interface, 10-die sinking thimble, 11-thimble mounting plate, 111-mounting panel, 112-mounting base plate, 12-reset piece, 13-die core, 14-oil pipe.

Detailed Description

The technical solution of the present invention will be described in further detail with reference to the following specific embodiments and accompanying drawings, but the scope of protection and the implementation of the present invention are not limited thereto.

In the description of the specific embodiments, it should be noted that the terms "upper" and "lower" are used for indicating the orientations and the positional relationships based on the orientations and the positional relationships shown in the drawings or the orientations and the positional relationships which are usually arranged when the product of the present invention is used, and are only used for facilitating the description of the present invention and simplifying the description, but not for indicating or implying that the structures or the elements which are indicated must have specific orientations, be constructed and operated with specific orientations, and therefore, cannot be understood as the limitation of the present invention, and even cannot be understood as indicating or implying relative importance.

Unless expressly stated or limited otherwise, the terms "mounted," "disposed," "connected," "secured," and the like are to be construed broadly and can include, for example, fixed connections, removable connections, or integral connections; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art as appropriate.

Example one

The utility model discloses an injection mold with interior extrusion function, please refer to fig. 1 and 2 and show, including upper die base 1 and the die holder 2 that can compound die each other. Wherein, the upper die base 1 is provided with an upper die, the lower die base 2 is provided with a lower die 3, the upper die and the lower die 3 can be mutually matched and form an injection molding cavity, and injection molding materials can be injected into the injection molding cavity to form an injection molding piece.

In an embodiment, referring to fig. 3 to 5, the lower mold 3 is mounted on the lower mold base 2 in an insert manner, and an injection mold cavity 301 is disposed on a surface of the lower mold 3 facing the upper mold. Correspondingly, an injection mold cavity correspondingly matched with the injection mold cavity 301 is arranged on the surface of the upper mold facing the lower mold 3, and when the upper mold and the lower mold 3 are closed, the injection mold cavity of the upper mold and the injection mold cavity 301 of the lower mold 3 are closed together to form an integral injection mold cavity structure for injection molding of injection molding parts. Further, the lower die 3 is provided with an injection port 303, and the lower die 3 has a runner 302 communicating the injection port 303 and the injection cavity 301.

When injection molding of the injection molding part is carried out, high-temperature molten injection molding material can be injected from the injection molding opening 303, flows into the injection molding cavity through the flow passage 302, and is cooled to form the injection molding part in the injection molding cavity.

In a preferred embodiment, referring again to fig. 3-5, an extrusion insert 4 is provided on the lower mold 3. Specifically, the extrusion insert 4 is embedded in the lower mold 3 and is movable relative to the lower mold 3. The movement of the extrusion insert 4 relative to the lower die 3 comprises extrusion and extension or reverse retraction from the lower die 3 towards the upper die, when injection molding of an injection molding piece is carried out, after a molten injection molding material is injected and filled into an injection molding cavity, the extrusion insert 4 can be extruded and extended into the injection molding cavity from the lower die 3 towards the upper die, the injection molding material at the corresponding part of the injection molding piece is extruded, and therefore a local thin-wall structure can be formed on the injection molding piece after cooling.

Wherein the injection mold cavity 301 of the lower mold 3 defines a corresponding plane, which corresponds in particular to the plane in which the injection molded part is molded, and the extrusion insert 4 is arranged to correspondingly protrude or retract from the plane defined by the injection mold cavity 301, and the plane corresponding to the extrusion insert 4 is smaller in particular than the plane defined by the injection mold cavity 301, so as to achieve effective extrusion molding of a local thin-walled structure of the injection molded part.

The extrusion insert 4 may be specifically an insert structure of any form, including a square shape, a circular shape, an irregular pattern, and the like, and may be specifically determined and selected according to the shape of a thin-walled structure to be formed. And the number of the extrusion inserts 4 can be one or multiple at the same time, and when multiple are arranged at the same time, multiple local thin-wall structures can be formed on a single injection molding piece by extrusion. In the illustrated embodiment, the extrusion insert 4 includes an extrusion square insert 41 and an extrusion round insert 42, and the extrusion square insert 41 and the extrusion round insert 42 are disposed independently from each other, and can respectively extrude the corresponding injection molded parts to form a square thin-walled structure and a circular thin-walled structure.

In some preferred embodiments, a mold core 13 is disposed on the lower mold base 2, the mold core 13 is fixed on the lower mold base 2, an upper end of the mold core 13 penetrates through the lower mold 3 to an upper end surface of the lower mold 3, and an end surface of the mold core 13 is flush with the upper end surface of the lower mold 3, wherein the extrusion round insert 42 is sleeved on the periphery of the mold core 13 and can extend or retract along the axial sliding movement of the mold core 13.

Further preferably, as shown in fig. 3 to 5, a pressing driving member 5 is provided. The squeeze driver 5 may be selected from, but not limited to, an electric motor or an oil cylinder. Wherein, the output end of the extrusion driving member 5 is in transmission connection with the extrusion insert 4, and the extrusion insert 4 can be driven to extend or retract from the lower die 3 to the upper die by the driving of the extrusion driving member 5.

Specifically, the extrusion driving member 5 is mounted on the lower die holder 2. The lower die holder 2 has a holder bottom plate 201 and a holder top plate 202, and the holder top plate 202 is supported by square iron and is oppositely disposed above the holder bottom plate 201. And extrusion driving piece 5 is connected with extrusion mold insert 4 transmission through connecting fixed plate 6, and connecting fixed plate 6 specifically is connected with the output transmission of extrusion driving piece 5, and extrudes mold insert 4 and connecting fixed plate 6 fixed connection. The extrusion driving part 5 can drive the connecting and fixing plate 6 to move up and down, and the extrusion insert 4 can be driven to move synchronously when the connecting and fixing plate 6 moves up and down, and the extrusion insert 4 moving up and down can extend or retract from the lower die 3.

In the illustrated embodiment, the connecting and fixing plate 6 includes a fixing panel 61 and a fixing base plate 62, both the fixing panel 61 and the fixing base plate 62 are movably disposed on the lower die base 2, wherein the fixing panel 61 is fixedly connected to the fixing base plate 62, and the fixing base plate 62 is directly connected to the output end of the extrusion driving member 5 in a transmission manner. Furthermore, the fixing surface plate 61 and the fixing base plate 62 are slidably disposed around the mold core 13, and are slidably movable in the axial direction of the mold core 13. The extrusion insert 4 is fixedly connected to the fixing panel 61, and the fixing panel 61 and the fixing base plate 62 can be driven to move up and down by the driving of the extrusion driving member 5, so as to drive the extrusion insert 4 to extend or retract.

In some preferred embodiments, the extrusion insert 4 includes an extrusion square insert 41 and an extrusion round insert 42, wherein the extrusion square insert 41 and the extrusion round insert 42 are both fixedly connected to the fixing panel 61 and can move up and down synchronously with the fixing panel 61, so as to simultaneously extend for thin-wall extrusion molding or retraction during injection molding of the injection molded part.

Further, referring to fig. 6 and 7, a buffer 7 is disposed between the connecting fixing plate 6 and the lower die base 2. Specifically, the buffer 7 is preferably, but not limited to, a spring, and the buffer 7 is mounted on the upper surface of the fixing panel 61 connected to the fixing plate 6, specifically corresponding to the holder top plate 202 of the lower holder 2. When the extrusion driving part 5 drives the connection fixing plate 6 to drive the extrusion insert 4 to stretch out for extrusion molding, the buffer part 7 can buffer the contact between the fixing panel 61 and the seat body top plate 202, and the direct collision between the fixing panel 61 and the seat body top plate 202 is avoided to cause the damage of the mold, so that the service life of the injection mold is ensured.

In another preferred embodiment, referring to fig. 3 to 5, a mold opening thimble 10 is disposed on the lower mold base 2. The mold opening thimble 10 is movably arranged on the lower mold base 2 and can be ejected out of the upper mold from the lower mold base 2 or retracted reversely; when the mold opening pin 10 is pushed out toward the upper mold, the upper mold is pushed out from above the lower mold 3, and the upper mold is released from the lower mold 3.

Specifically, the mold opening thimble 10 is mounted on the seat top plate 202 of the lower mold base 2 in a vertically retractable manner, and can extend out or retract from the seat top plate 202. Optionally, but not limited to, at least around the top plate 202 of the base, there are mold opening thimbles 10, and when the upper mold is installed on the upper mold base 1, the mold opening thimbles 10 correspond to the upper mold base 1, and when they extend upward, they push the upper mold base 1 directly against the upper mold base 1 to open the upper mold base 1, so that the upper mold installed on the upper mold base 1 is released from the lower mold 3.

Further, a mold opening thimble 10 is mounted on the lower die base 2 through a thimble mounting plate 11. The thimble mounting plate 11 is movably disposed between the seat bottom plate 201 and the seat top plate 202, the thimble mounting plate 11 can move between the seat bottom plate 201 and the seat top plate 202 along a direction approaching to or departing from the upper mold, and the mold opening thimble 10 is mounted on the thimble mounting plate 11 and can move along with the thimble mounting plate 11. Specifically, the thimble mounting plate 11 includes a mounting panel 111 and a mounting base plate 112, wherein the mounting panel 111 is fixed on the mounting base plate 112, the mold opening thimble 10 is fixedly mounted on the mounting panel 111, and both the mounting panel 111 and the mounting base plate 112 are sleeved on the mold core 13 and can move along the axial direction of the mold core 13.

After injection molding and extrusion molding of the injection molding piece are finished, the ejector pin mounting plate 11 is driven to drive the mold opening ejector pin 10 to move upwards and push out from the lower mold base 2, the upper mold base 1 is pushed open, and then mold opening can be carried out between the upper mold and the lower mold 3.

Example two

The injection mold with in-mold extrusion molding function of this embodiment is the same as the first embodiment, and further preferably, as shown in fig. 1 to fig. 7, wherein the extrusion driving member 5 is an oil cylinder, and an oil passage 8 is provided in communication with the oil cylinder. Therefore, stable and sufficient extrusion torque can be provided for the extrusion insert 4, effective extrusion forming of a local thin-wall structure in the injection molding part is ensured, the wall thickness of the extruded local thin wall can reach below 0.5 time of that of the injection molding part, and the appearance of the injection molding part is not influenced.

Specifically, the oil cylinders can be multiple, the oil cylinders are uniformly distributed on the periphery of the mold core 13, and the oil cylinders are in transmission connection with the extrusion insert 4 through the connecting and fixing plate 6.

Further, the oil path 8 is specifically arranged in a seat body bottom plate 201 of the lower die holder 2, the oil cylinder is communicated with the oil path 8, and a nozzle connector 9 communicated with the oil path 8 is arranged on the seat body bottom plate 201, and the nozzle connector 9 can be externally connected with an oil pipe 14 for supplying oil.

In some preferred embodiments, a control box may be provided, in which a control module and a supply pump are provided, wherein the control module is in communication with the supply pump and the squeeze driver 5, for example, the control module may be in communication with the squeeze driver 5 via a connecting line, and the supply pump is in communication with the oil line 14 via the nipple connector 9. When extrusion molding is carried out, the extrusion driving piece 5 and the oil supply pump can be controlled by the control module to work, and then automatic extrusion operation is realized.

EXAMPLE III

The injection mold with in-mold extrusion molding function of this embodiment is the same as the first or second embodiment, and further preferably, referring to fig. 2 to 5, a reset element 12 is disposed between the thimble mounting plate 11 and the lower die base 2.

The reset element 12 is preferably but not limited to a spring, and is specifically sleeved on the mold opening thimble 10, and two ends of the spring are respectively connected to the thimble mounting plate 11 and the seat top plate 202 of the lower die seat 2. When the mold is opened, the thimble mounting plate 11 drives the mold opening thimble 10 to move upwards and extend out of the top plate 202 of the seat body to jack the upper mold base 1, and the spring between the thimble mounting plate 11 and the top plate 202 of the seat body is compressed and accumulates elastic potential energy; after the external force acting on the thimble mounting plate 11 is released, the spring releases elastic potential energy, pushes the thimble mounting plate 11 to move downwards for resetting, and further drives the die sinking thimble 10 to automatically retract and reset.

The above embodiments are merely preferred embodiments of the present invention, and are only intended to describe the technical solutions of the present invention in further detail, but the above descriptions are exemplary, not exhaustive, and not limited to the disclosed embodiments, the protection scope and implementation manner of the present invention are not limited thereto, and any changes, combinations, deletions, substitutions or modifications that do not depart from the spirit and principle of the present invention are all included in the protection scope of the present invention.

Claims (10)

1. An injection mold with an in-mold extrusion forming function is characterized by comprising an upper mold and a lower mold, wherein the upper mold and the lower mold can be mutually matched; an extrusion insert is arranged on the lower die;

the extrusion insert is movably arranged on the lower die and can be extruded and extended or retracted towards the upper die in a reverse direction.

2. The injection mold having in-mold extrusion molding function according to claim 1, wherein an extrusion driving member is provided; the extrusion driving piece is in transmission connection with the extrusion insert and can drive the extrusion insert to extend and retract.

3. The injection mold with in-mold extrusion molding function as claimed in claim 2, wherein the extrusion driving member is in transmission connection with the extrusion insert through a connection fixing plate.

4. The injection mold with in-mold extrusion molding function according to claim 3, wherein the connecting fixing plate is disposed on the lower mold base; and a buffer part is arranged between the connecting and fixing plate and the lower die base.

5. An injection mold having an in-mold extrusion function as set forth in any one of claims 2 to 4, wherein said extrusion driving member is an oil cylinder and is provided with an oil passage communicating with said oil cylinder.

6. The injection mold with in-mold extrusion molding function according to claim 1, wherein the lower mold has an injection mold cavity and a runner communicating with the injection mold cavity; the extrusion inserts correspondingly extend or retract from the plane defined by the injection mold cavity.

7. The injection mold with in-mold extrusion molding function according to claim 1, wherein the lower mold is provided on a lower mold base; the lower die base is provided with a die opening thimble, and the die opening thimble is movably arranged on the lower die base and can be ejected towards the upper die or retracted reversely; and when the die opening thimble ejects towards the upper die, the upper die can be demoulded from the lower die.

8. The injection mold with the in-mold extrusion molding function as claimed in claim 7, wherein the mold opening thimble is mounted on the lower mold base through a thimble mounting plate; the thimble mounting panel can be in along being close to or keeping away from on the die holder the direction of going up the mould removes, the die sinking thimble is installed on the thimble mounting panel and can follow the thimble mounting panel removes.

9. The injection mold with the in-mold extrusion molding function as claimed in claim 8, wherein a reset piece is arranged between the thimble mounting plate and the lower die holder.

10. The injection mold with in-mold extrusion molding function as set forth in claim 1, wherein the upper mold is provided on an upper mold base.

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