CN112277246A - Insert injection mold and injection molding method thereof - Google Patents

Abstract

The invention relates to an insert injection mold and an injection molding method thereof, wherein the insert injection mold comprises a fixed mold component and a movable mold component, the fixed mold component comprises a fixed plate, an upper mold plate which can move relative to the fixed plate along the mold opening direction, and an elastic driving mechanism which is used for providing elastic acting force to drive the upper mold plate to move towards the fixed plate; still be equipped with magnetism clamping mechanism between cope match-plate pattern and the movable mould subassembly, the movable mould subassembly includes and encloses the lower bolster that closes formation product die cavity when mutually supporting and the compound die with the cope match-plate pattern, and the fixed plate is connected with the locating lever, and the end of locating lever passes the cope match-plate pattern and inserts in the product die cavity for the inserts is installed in the location, and when the relative fixed plate of cope match-plate pattern kept away from, the end of locating lever can be followed the inserts and taken out from. The insert injection mold disclosed by the invention is simple in structure, and can realize automatic demolding of the insert arranged on the fixed mold side without arranging the ejection mechanism on the fixed mold component and externally connecting a power mechanism for driving the ejection mechanism to move, so that the manufacturing cost and the use cost of the mold are greatly reduced.

Description

Insert injection mold and injection molding method thereof

Technical Field

The invention belongs to the technical field of molds, and particularly relates to an insert injection mold and an injection molding method thereof.

Background

The injection mold comprises a movable mold component and a fixed mold component, the movable mold component is installed on a movable mold plate of the injection molding machine, the fixed mold component is installed on a fixed mold plate of the injection molding machine, the movable mold and the fixed mold are closed to form a mold cavity and a pouring system during injection molding, and the mold can be opened after injected molten plastic is cooled so as to separate the movable mold component from the fixed mold component and take out an injection molding finished product.

Along with the requirements of electronic products on higher and higher, the internal structure types are more and more diversified, more and more products require internal injection molding inserts, namely, inserts made of metal materials are placed in a mold cavity in advance to be fixed, and then plastic is injected for molding, so that injection molding finished products and the inserts are integrally molded; in a general mold structure, an insert is usually placed on the movable mold side to facilitate smooth demolding of the insert, but some products require the insert to be placed on the fixed mold side, which causes great trouble to demolding of the insert, and the existing solution is to arrange an ejection mechanism on the fixed mold side, as shown in fig. 1, the ejection mechanism on the fixed mold side 1 comprises an ejector pin 2, an ejector pin plate 3 and an external power mechanism such as an oil cylinder 4, so that the ejector pin plate 3 is driven to move by the oil cylinder 4, and the ejector pin 2 can eject the insert 5 from the fixed mold side 1 to achieve smooth demolding; however, such a structure leads to a complicated and bulky mold structure, and also increases the cost of the mold.

Disclosure of Invention

The invention aims to solve the defects in the prior art at least to a certain extent and provides an insert injection mold and an injection molding method thereof.

In order to achieve the above object, an embodiment of the present invention provides an insert injection mold, including a fixed mold assembly and a movable mold assembly, where the fixed mold assembly includes a fixed plate, an upper mold plate movable relative to the fixed plate along a mold opening direction, and an elastic driving mechanism for providing an elastic acting force to drive the upper mold plate to move towards the fixed plate; the die comprises an upper die plate, a movable die assembly and a lower die plate, wherein the upper die plate is arranged on the movable die assembly, the movable die assembly comprises a lower die plate, the lower die plate and the upper die plate are matched with each other, a product cavity is formed in a surrounding mode when die assembly is carried out, the fixed plate is connected with a positioning rod, the tail end of the positioning rod penetrates through the upper die plate and is inserted into the product cavity for positioning and installing an insert, and when the upper die plate is far away from the fixed plate, the tail end of the positioning rod can be pulled away from the insert.

Preferably, the magnetic clamping mechanism comprises a magnet and an electromagnet, one of the magnet and the electromagnet is fixed on the side wall of the upper template, and the other of the magnet and the electromagnet is fixed on the side wall of the lower template.

Preferably, when the electromagnet is electrified to generate a magnetic field, the attraction force between the electromagnet and the magnet is larger than the elastic acting force of the elastic driving mechanism.

Preferably, a first through hole is formed in one side, opposite to the fixing plate, of the upper template, a second through hole communicated with the first through hole is formed in one side, opposite to the lower template, of the upper template, and the aperture of the second through hole is larger than that of the first through hole; the elastic driving mechanism comprises a limiting part and an elastic part, the limiting part penetrates through the first through hole of the upper template in a vertically sliding mode, one end of the limiting part is fixed to the fixing plate, the other end of the limiting part extends into the second through hole and is provided with a stop flange along the radial direction in a protruding mode, the elastic part is sleeved on the limiting part, one end of the elastic part abuts against the bottom wall of the second through hole, and the other end of the elastic part abuts against the stop flange and is used for providing elastic acting force for driving the upper template to be close to the fixing plate.

Preferably, the limiting member is a bolt, one end of the bolt opposite to the stopping flange is a threaded portion, and the limiting member is fixed to the fixing plate through the threaded portion.

Preferably, the elastic member is a compression spring.

Preferably, the upper die plate is provided with an insert groove at a position corresponding to the product cavity, and the tail end of the positioning rod is inserted into the insert groove.

Preferably, the insert is provided with a positioning hole matched with the diameter of the positioning rod in a penetrating manner.

Preferably, the end of the positioning rod is a conical structure.

The invention also provides an injection molding method of the insert injection mold, which comprises the following steps:

in the mold opening state, the insert is arranged in the product cavity and is arranged on the positioning rod;

the movable mold component moves to a mold closing state towards the fixed mold component and starts to perform injection molding;

after the injection molding is finished, the movable mold assembly drives the upper mold plate to overcome the elastic acting force of the elastic driving mechanism through the magnetic mold locking mechanism and to be away from the fixed plate, so that the tail end of the positioning rod is pulled away from the insert;

the magnetic clamping mechanism is unlocked, so that the upper template is reset to be attached to the fixed plate under the action of the elastic action force; and meanwhile, the movable die assembly continues to be far away from the fixed die assembly to complete the die opening action, so that the molded product embedded with the insert is ejected out.

According to the embodiment of the invention, the insert injection mold is simple in structure, the existing mold structure is not required to be greatly improved, the automatic demolding of the insert arranged on the fixed mold side can be realized without arranging the ejection mechanism on the fixed mold component and externally connecting the power mechanism for driving the ejection mechanism to move, and the manufacturing cost and the use cost of the mold are greatly reduced.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without inventive exercise.

FIG. 1 is a schematic structural diagram of a conventional insert injection mold;

FIG. 2 is a schematic structural view of an embodiment of an insert injection mold according to the present invention;

FIG. 3 is a schematic view of an insert injection mold according to an embodiment of the present invention with the top mold plate separated from the fixed plate;

FIG. 4 is a schematic view of the insert injection mold according to the embodiment of the present invention.

Detailed Description

Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are exemplary and intended to be illustrative of the present invention and should not be construed as limiting the present invention, and all other embodiments that can be obtained by one skilled in the art based on the embodiments of the present invention without inventive efforts shall fall within the scope of protection of the present invention.

Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless specifically defined otherwise.

Referring to fig. 2, an embodiment of the present invention discloses an insert injection mold, which includes a fixed mold assembly 10 and a movable mold assembly 20.

Specifically, the fixed mold assembly 10 includes a fixed mold base plate 11 for fixing on a fixed mold plate of the injection molding machine, a fixed plate 12 fixed with the fixed mold base plate 11, an upper mold plate 13 movable relative to the fixed plate 12 along a mold opening direction, and an elastic driving mechanism 30 for providing an elastic acting force to drive the upper mold plate 13 to move towards the fixed plate 12, wherein the upper mold plate 13 is attached and fixed on the other side of the fixed plate 12 relative to the fixed mold base plate 11 under the elastic acting force of the elastic driving mechanism 30 under the effect of no external force.

The movable mold assembly 20 comprises a movable mold base plate 21 fixed on a movable mold plate of the injection molding machine, a backing plate 22 fixed with the movable mold base plate 21, and a lower mold plate 23 fixed with the backing plate 22, wherein the lower mold plate 23 and the upper mold plate 13 are matched with each other and enclose a product cavity (not shown) when the molds are closed.

A magnetic clamping mechanism 40 is further arranged between the upper die plate 13 and the movable die assembly 20, the magnetic clamping mechanism 40 comprises a magnet 41 and an electromagnet 42, in the embodiment, the magnet 41 can be fixed on the upper die plate 13, the electromagnet 42 is correspondingly fixed on the lower die plate 23, when the electromagnet 42 is electrified, a magnetic field can be generated to adsorb the magnet 41, so that the upper die plate 13 and the lower die plate 23 are locked in a die assembly state, and the attraction force between the electromagnet 42 and the magnet 41 is greater than the elastic acting force of the elastic driving mechanism 30.

Of course, the magnet 41 may be fixed to the lower platen 23, and the electromagnet 42 may be correspondingly fixed to the upper platen 13, as long as the electromagnet 42 is energized to generate a magnetic field to attract the magnet 41 and achieve the locking action on the upper platen 13 and the lower platen 23.

The fixing plate 12 is connected with a positioning rod 14, the tail end of the positioning rod 14 penetrates through the upper die plate 13 and is inserted into the product cavity to be used for positioning the installation insert 50, and when the upper die plate 13 is far away from the fixing plate 12, the tail end of the positioning rod 14 can be pulled away from the insert 50. More specifically, the position of the upper mold plate 13 corresponding to the product cavity is provided with an insert groove 15, the tail end of the positioning rod 14 is inserted into the insert groove 15, and the installed insert 50 is provided with a positioning hole 151 matched with the diameter of the positioning rod 14 in a penetrating manner, so that the insert 50 can be conveniently positioned and fixed in the product cavity; to facilitate the installation of the insert 50 and the extraction of the locating rod 14 from the locating hole 151 of the insert 50, the end of the locating rod 14 is conically configured.

In some embodiments, a first through hole 131 is formed at a side of the upper mold plate 13 opposite to the fixing plate 12, a second through hole 132 communicated with the first through hole 131 is formed at a side of the upper mold plate 13 opposite to the lower mold plate 23, the first through hole 131 and the second through hole 132 are coaxially arranged, and the aperture of the second through hole 132 is larger than that of the first through hole 131; the elastic driving mechanism 30 is installed in the first through hole 131 and the second through hole 132, and is connected to the fixing plate 12.

Specifically, the elastic driving mechanism 30 includes a limiting member 31 and an elastic member 32, the limiting member 31 is slidably disposed in the first through hole 131 of the upper mold plate 13 up and down, one end of the limiting member 31 is fixed on the fixing plate 12, the other end of the limiting member extends into the second through hole 132 and is provided with a stopping flange 311 along a radial direction, the elastic member 32 is sleeved on the limiting member 31, one end of the elastic member abuts against the bottom wall of the second through hole 132, and the other end of the elastic member abuts against the stopping flange 311, so as to provide an elastic acting force for driving the upper mold plate 13 to approach the. That is, the upper plate 13 is separated from the fixed plate 12 against the elastic force of the elastic member 32 by the external force, so that the positioning rod 14 can be relatively withdrawn from the insert groove 15.

Preferably, the limiting member 31 is a bolt, and one end of the bolt opposite to the stop flange 311 is a threaded portion 312, and the limiting member 31 is fixed to the fixing plate 12 by the threaded portion 312; the elastic member 32 is a compression spring. Thus, the distance between the stop flange 311 of the limiting member 31 and the fixing plate 12 can be adjusted through the threaded connection structure, so that the separable maximum distance between the upper die plate 13 and the fixing plate 12 can be adjusted; in practice, the distance between the stop flange 311 and the fixing plate 12 can be determined according to the length of the positioning rod 14 extending into the insert groove 15.

The specific injection molding method of the insert injection mold comprises the following steps:

in the mold opening state, the insert 50 is arranged in a product cavity and is arranged on the positioning rod 14; it should be understood that the upper plate 13 is fixed on the fixed plate 12 by the elastic driving mechanism 30 without external force, and the positioning rod 14 is inserted into the insert groove 15 to position the insert 50.

Then controlling the movable mold component 20 to move towards the fixed mold component 10 to a mold closing state and starting injection molding; after the injection molding is completed, the electromagnet 42 of the magnetic clamping mechanism 40 is kept in an energized state to fix the upper mold plate 13 and the lower mold plate 23.

Then, under the action of a movable template of the injection molding machine, the movable mold assembly 20 is controlled to drive the upper template 13 to overcome the elastic acting force of the elastic driving mechanism 30 through the magnetic mold locking mechanism 40 and to be away from the fixed plate 12, and as shown in fig. 3, the tail end of the positioning rod 14 is pulled away from the insert 50; that is, the positioning rod 14 is fixed to the fixing plate 12 by separating the upper plate 13 from the fixing plate 12, so that the end of the positioning rod 14 is separated from the positioning hole 151 of the insert 50.

Then, the electromagnet 42 of the magnetic mold clamping mechanism 40 is de-energized, so that the attraction force between the upper mold plate 13 and the lower mold plate 23 disappears, as shown in fig. 4, the upper mold plate 13 is reset to be attached and fixed to the fixing plate 12 under the action of the elastic force, the insert 50 is smoothly released from the upper mold plate 13, and at this time, the positioning rod 14 is reset to be inserted into the insert groove 15 from the tail end of the upper mold plate 13 relative to the upper mold plate 13.

Meanwhile, the movable mold component 20 continuously moves away from the fixed mold component 10 to complete the mold opening action, so that the molded product embedded with the insert 50 is ejected out; the insert 50 can then be placed again and the injection molding continued for the next product.

In conclusion, the insert injection mold of the present invention has a simple structure, and does not need to greatly improve the structure of the existing mold, i.e., the automatic demolding of the insert 50 installed on the fixed mold side can be realized without arranging an ejection mechanism on the fixed mold component 10 and externally connecting a power mechanism for driving the ejection mechanism to move, so as to greatly reduce the manufacturing cost and the use cost of the mold.

In the above embodiments, the descriptions of the respective embodiments have respective emphasis, and for parts that are not described in detail in a certain embodiment, reference may be made to related descriptions of other embodiments.

In view of the above description of the technical solutions provided by the present invention, those skilled in the art will recognize that there may be variations in the technical solutions and the application ranges according to the concepts of the embodiments of the present invention, and in summary, the content of the present specification should not be construed as limiting the present invention.

Claims (10)

1. An insert injection mold comprises a fixed mold component and a movable mold component, and is characterized in that the fixed mold component comprises a fixed plate, an upper mold plate capable of moving relative to the fixed plate along a mold opening direction, and an elastic driving mechanism for providing elastic acting force to drive the upper mold plate to move towards the fixed plate; the die comprises an upper die plate, a movable die assembly and a lower die plate, wherein the upper die plate is arranged on the movable die assembly, the movable die assembly comprises a lower die plate, the lower die plate and the upper die plate are matched with each other, a product cavity is formed in a surrounding mode when die assembly is carried out, the fixed plate is connected with a positioning rod, the tail end of the positioning rod penetrates through the upper die plate and is inserted into the product cavity for positioning and installing an insert, and when the upper die plate is far away from the fixed plate, the tail end of the positioning rod can be pulled away from the insert.

2. The insert injection mold of claim 1, wherein the magnetic clamping mechanism comprises a magnet and an electromagnet, one of the magnet and the electromagnet is fixed to the side wall of the upper mold plate, and the other of the magnet and the electromagnet is fixed to the side wall of the lower mold plate.

3. The insert injection mold of claim 2, wherein when the electromagnet is energized to generate the magnetic field, an attractive force between the electromagnet and the magnet is larger than an elastic force of the elastic driving mechanism.

4. The insert injection mold according to claim 1, wherein a first through hole is formed in a side of the upper mold plate opposite to the fixing plate, a second through hole communicated with the first through hole is formed in a side of the upper mold plate opposite to the lower mold plate, and the aperture of the second through hole is larger than that of the first through hole; the elastic driving mechanism comprises a limiting part and an elastic part, the limiting part penetrates through the first through hole of the upper template in a vertically sliding mode, one end of the limiting part is fixed to the fixing plate, the other end of the limiting part extends into the second through hole and is provided with a stop flange along the radial direction in a protruding mode, the elastic part is sleeved on the limiting part, one end of the elastic part abuts against the bottom wall of the second through hole, and the other end of the elastic part abuts against the stop flange and is used for providing elastic acting force for driving the upper template to be close to the fixing plate.

5. The insert injection mold according to claim 4, wherein the stopper is a bolt, and an end thereof opposite to the stopper flange is a threaded portion, and the stopper is fixed to the fixing plate by being screwed through the threaded portion.

6. The insert injection mold of claim 4, wherein the resilient member is a compression spring.

7. The insert injection mold according to claim 1, wherein an insert groove is formed in a position of the upper mold plate corresponding to the product cavity, and a distal end of the positioning rod is inserted into the insert groove.

8. The insert injection mold according to claim 1, wherein the insert is provided with a positioning hole through which the diameter of the positioning rod is adapted.

9. The insert injection mold of claim 1, wherein the end of the locating rod is a conical structure.

10. An injection molding method of an insert injection mold according to any one of claims 1 to 9, comprising the steps of:

in the mold opening state, the insert is arranged in the product cavity and is arranged on the positioning rod;

the movable mold component moves to a mold closing state towards the fixed mold component and starts to perform injection molding;

after the injection molding is finished, the movable mold assembly drives the upper mold plate to overcome the elastic acting force of the elastic driving mechanism through the magnetic mold locking mechanism and to be away from the fixed plate, so that the tail end of the positioning rod is pulled away from the insert;

the magnetic clamping mechanism is unlocked, so that the upper template is reset to be attached to the fixed plate under the action of the elastic action force; and meanwhile, the movable die assembly continues to be far away from the fixed die assembly to complete the die opening action, so that the molded product embedded with the insert is ejected out.

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