CN106827400A - Injection molding method and injection mold - Google Patents

Abstract

The embodiment of the invention discloses an injection molding method and an injection mold, wherein the injection molding method comprises the following steps: providing a part to be injected, wherein the part to be injected is provided with a gap; providing a first mold on one side of the piece to be injected, wherein the first mold is provided with a glue injection port and a fan-shaped runner which is communicated with the glue injection port and radially expands relative to the glue injection port; and injecting glue stock into the glue injection port so that the glue stock flows to the gap radially through the fan-shaped flow channel. The injection mold is provided with a glue injection port and a fan-shaped runner which is communicated with the glue injection port and radially expands relative to the glue injection port. The invention can ensure the glue feeding balance in the injection molding process, improve the adhesive force of injection molding products, reduce the reject ratio and reduce the waste.

Description

Injection molding method and injection mold

technical field

The invention relates to the technical field of injection molding, in particular to an injection molding method and an injection mold.

Background technique

The existing plastic injection mold is provided with a glue injection port and two tubular flow channels connected with the glue injection port, and the two tubular flow channels communicate with the two ends of the elongated cavity such as the slit respectively. The rubber enters the tubular flow channel from the injection port, flows into the gap from the outlet of the tubular flow channel, and then flows in the gap to fill the entire gap to form in the gap.

Since the connection between the flow channel and the gap is only a certain point of the gap, such as the two ends of the gap, after the glue enters the gap from the end point, it will fill the gap by flowing in the length direction of the gap, so it is easy to cause the glue to enter Unbalanced, and because the flow of the rubber is mainly driven by the injection pressure, the injection pressure of the rubber in the gap is not uniform, which will easily lead to the problem of weak adhesion of the injection molded product, which will eventually lead to an increase in the defect rate and cause a large number of waste.

Contents of the invention

The main technical problem to be solved by the embodiments of the present invention is to provide an injection molding method and an injection mold, which can solve the problem of weak adhesion of injection molding products in the prior art.

In order to solve the above technical problems, a technical solution adopted by the embodiment of the present invention is to provide an injection molding method, the method comprising: providing a part to be injected, wherein a gap is provided on the part to be injected; A first mold is provided on one side of the first mold, wherein the first mold is provided with an injection port and a fan-shaped flow channel that communicates with the injection port and is radially expanded relative to the injection port; glue, so that the glue flows radially through the fan-shaped flow channel to the gap.

Wherein, the fan-shaped flow channel is arranged to cover the slit as a whole along the length direction of the slit.

Wherein, the depth of a part of the flow channel area at the two side edges of the fan-shaped flow channel connected to the injection port is set to be greater than the depth of other flow channel areas.

Wherein, the part of the flow channel region with a relatively large depth is arranged in the shape of a long strip extending radially along the injection port.

Wherein, the step of providing a first mold on one side of the part to be injected further includes: providing a second mold on the other side of the part to be injected, and the second mold is provided with a cavity; The step of injecting the rubber into the injection port includes: making the rubber flow into the mold cavity through the gap, and then injection molding in the gap and the mold cavity.

Wherein, the part to be injected includes a main side wall and an outer peripheral wall connected with the main side wall, and the main side wall and the outer peripheral wall are surrounded by a recess; The step of providing the first mold on the side includes: providing the first mold on a side of the part to be injected away from the concave part, and providing the first mold on the other side of the part to be injected facing the concave part. Describe the second mold.

Wherein, the depth of a part of the cavity region corresponding to the inner side of the outer peripheral wall of the cavity is set to be greater than the depth of other cavity regions.

Wherein, the second mold is further provided with a cold slug well communicating with the cavity, wherein the part to be injected includes an extension part connected to the peripheral wall and extending to the outside of the part to be injected, wherein The cold slug well is arranged corresponding to the extension part.

In order to solve the above-mentioned technical problems, a technical solution adopted by another embodiment of the present invention is to provide an injection mold, the injection mold is provided with an injection port and a Fan-shaped runners that expand radially.

Wherein, the depth of a part of the flow channel area at the two side edges of the fan-shaped flow channel connected to the injection port is set to be greater than the depth of other flow channel areas.

The beneficial effect of the embodiment of the present invention is: the present invention sets the fan-shaped flow channel on the first mold, so that the rubber material flows along the fan-shaped flow channel from the injection port, and flows radially with the shape of the fan-shaped flow channel, and Directly flow from the fan-shaped flow channel to the position where the gap is connected with the fan-shaped flow channel, thereby filling the entire gap. In the present invention, since the rubber material flows from the fan-shaped flow channel to the gap, the communication position between the fan-shaped flow channel and the gap is no longer just two One end point, but a plurality of continuous points in the length direction of the gap, thus reducing the flow of rubber in the length direction of the gap, thus ensuring the balance of the glue feeding, and uniformly transmitting the injection pressure, thereby enhancing the injection molded product. Adhesion, reduce defective rate, reduce waste.

Description of drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings that need to be used in the description of the embodiments will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the present invention. For those skilled in the art, other drawings can also be obtained based on these drawings without creative effort.

Fig. 1 is a schematic flow chart of an injection molding method provided by an embodiment of the present invention;

Fig. 2 is a structural schematic diagram of an angle of a part to be injected in an injection molding method provided by an embodiment of the present invention;

Fig. 3 is a schematic structural view of another angle of the injection molded part in Fig. 2;

4 is a schematic diagram of the three-dimensional structure of the first mold in an injection molding method provided by an embodiment of the present invention;

Fig. 5 is a schematic structural view of the inner surface of the first mold in Fig. 4;

Fig. 6 is a schematic flow chart of an injection molding method provided by another embodiment of the present invention;

Fig. 7 is a schematic structural view of the injection mold in the injection molding method provided by another embodiment of the present invention;

Fig. 8 is a schematic diagram of the three-dimensional structure of the second mold in the injection molding method provided by another embodiment of the present invention;

Fig. 9 is a schematic structural view of the side opposite to the first mould, the second mold in Fig. 8;

Fig. 10 is a structural schematic diagram of an angle of a product obtained by injection molding provided by an injection molding method according to another embodiment of the present invention;

Fig. 11 is a structural schematic view of the product in Fig. 10 from another angle.

detailed description

The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

Please refer to FIG. 1 . FIG. 1 is a schematic flowchart of an injection molding method provided by an embodiment of the present invention.

The injection molding method of the present embodiment comprises the following steps:

S101. Provide a part to be injected, wherein the part to be injected is provided with a gap.

Specifically, there is a space to be injected on the part to be injected, and the rubber material is formed on the space to be injected by injection molding, and bonded to the part to be injected. As shown in Fig. 2 and Fig. 3, Fig. 2 is a structural schematic diagram of one angle of the part to be injected in an injection molding method provided by an embodiment of the present invention; Fig. 3 is a structural schematic diagram of another angle of the part to be injected in Fig. 2 . The to-be-injected space in this embodiment is the gap 102 provided on the to-be-injected part 10 .

For example, the to-be-molded part 10 may be a shell of electronic equipment such as a mobile phone and a tablet, and a slot 102 is formed on the shell for setting an antenna of the electronic equipment. In this embodiment, the case of a mobile phone is used as an example to be described as the part 10 to be injected, and two ends of the case of the mobile phone are respectively provided with slits 102 . It can be understood that the part 10 to be injected can also be other products provided with a gap 102 as a space to be injected.

S102. A first mold is provided on one side of the part to be injected, wherein the first mold is provided with a glue injection port and a fan-shaped flow channel communicating with the glue injection port and radially expanding relative to the glue injection port.

Please refer to FIG. 4 and FIG. 5 , FIG. 4 is a schematic perspective view of the first mold in an injection molding method provided by an embodiment of the present invention; FIG. 5 is a schematic structural view of the inner surface of the first mold in FIG. 4 .

Specifically, the first mold 12 is provided with a glue injection port 122 and a fan-shaped flow channel 124 . The first mold 12 of the present embodiment includes an opposite inner surface 126 and an outer surface 128, the injection port 122 runs through the inner surface 126 and the outer surface 128 of the first mold 12, and the fan-shaped runner 124 is on the inner surface of the first mold 12 126 is recessed to form a flow channel, the fan-shaped flow channel 124 communicates with the injection port 122, so that the glue in the injection port 122 flows into the fan-shaped flow channel 124, and the fan-shaped flow channel 124 is radial to the injection port 122 Unfolding, the rubber material flows radially along the fan-shaped flow channel 124 .

In step S102 , the first mold 12 is provided on one side of the part to be molded 10 , and the fan-shaped flow channel 124 of the first mold 12 communicates with the gap 102 , so that the rubber material flows from the fan-shaped flow channel 124 into the gap 102 .

S103. Inject rubber material into the injection port, so that the rubber material flows radially to the gap through the fan-shaped flow channel.

In step S103 , after injecting the rubber material into the injection port 122 , the rubber material enters the fan-shaped flow channel 124 and flows along the fan-shaped flow channel 124 into the gap 102 of the part 10 to be injected, thereby forming in the gap 102 .

Different from the prior art, the present invention sets the fan-shaped flow channel 124 on the first mold 12, so that the rubber material flows from the injection port 122 along the fan-shaped flow channel 124, and flows radially with the shape of the fan-shaped flow channel 124 , and directly flow from the fan-shaped flow channel 124 to the position where the gap 102 is connected to the fan-shaped flow channel 124, thereby filling the entire gap 102. In the present invention, since the rubber material flows from the fan-shaped flow channel 124 to the gap 102, the fan-shaped flow channel 124 and The communication position of the gap 102 is no longer just two end points, but a plurality of continuous points in the length direction of the gap 102, thereby reducing the flow of the glue in the length direction of the gap 102, thus ensuring the balance of the glue feeding, and It can evenly transmit injection molding pressure, thereby enhancing the adhesion of injection molding products, reducing defective rate and waste.

In this embodiment, the fan-shaped flow channel 124 is arranged to cover the slit 102 as a whole along the length direction of the slit 102, so that all positions in the length direction of the entire slit 102 are connected with the fan-shaped flow channel, so that the rubber material can directly flow from the fan-shaped flow channel 124 It flows into each position in the length direction of the gap 102 for filling, avoiding the need for rubber to flow in the gap 102 along the length direction of the gap 102 to fill the gap 102, further improving the balance of the glue feeding, and increasing the adhesion of the injection molding product. Reduce defective rate and reduce waste.

In some embodiments, the fan-shaped flow channels 124 on the first mold 12 have the same concave depth, and the glue directly enters the fan-shaped flow channels 124 from the injection port 122 and flows radially. In this embodiment, the depth of the part of the flow channel area 121 at the two side edges connecting the fan-shaped flow channel 124 and the injection port 20 is set to be greater than the depth of the other flow channel areas 123, so that the glue enters from the injection port 122 After the fan-shaped flow channel 124, it is firstly buffered in the relatively deep partial flow channel area 121, and then flows into the relatively small depth partial flow channel area 123, so as to avoid rubber blockage and facilitate the continuous progress of the injection molding process.

Furthermore, the part of the flow channel region 121 with a relatively large depth is arranged in a strip shape extending radially along the injection port 122, so that the rubber material has enough space for buffering, and the part of the flow channel with a relatively large depth The projection of the region 121 in the direction toward the slit 102 completely covers the length of the slit 102 , thus enabling the glue to flow into the slit 102 evenly, further ensuring the balance of glue feeding.

Please refer to FIG. 6 . FIG. 6 is a schematic flowchart of an injection molding method provided by another embodiment of the present invention.

The injection molding method of the present embodiment comprises the following steps:

S201. Provide a part to be injected, wherein the part to be injected is provided with a gap.

Specifically, please continue to refer to FIG. 2 and FIG. 3 , the specific structure of the injection molded part 10 is as follows: it includes a main side wall 104 and an outer peripheral wall 106 connected to the main side wall 104, and the main side wall 104 and the outer peripheral wall 106 are surrounded by a Depression 108 . The slot 102 is provided on the main side wall 104 .

S202. Provide a first mold on one side of the part to be injected, and provide a second mold on the other side of the part to be injected, wherein the first mold is provided with an injection port and is communicated with the injection port and radially relative to the injection port The fan-shaped flow channel is expanded, and the second mold is provided with a cavity.

As shown in FIG. 7 , FIG. 7 is a schematic structural view of an injection mold in an injection molding method provided by another embodiment of the present invention. Specifically, the injection mold of this embodiment includes a first mold 12 and a second mold 14 that cooperate with each other. During injection molding, the side of the part to be injected 10 formed with the recessed part 108 is opposite to the second mold 14 , and the first mold 12 is arranged on the side of the part to be injected 10 away from the recessed part 108 .

Wherein, the first mold 12 is the first mold 12 of any one of the above-mentioned embodiments, and its detailed structure will not be repeated here.

Please refer to FIG. 8 and FIG. 9 . FIG. 8 is a schematic structural view of the second mold in the injection molding method provided by another embodiment of the present invention. FIG. 9 is a schematic structural view of the side of the second mold in FIG. 8 opposite to the first mold. The second mold 14 is provided with a cavity 142, and the shape of the cavity 142 is designed according to product requirements, for example, the cavity 142 in this embodiment is rectangular. Of course, in other embodiments, the cavity 142 may also have other shapes. The cavity 142 communicates with the slit 102 of the part 10 to be injected, so that the rubber material enters the cavity 142 through the slit 102 , and is molded in the cavity 142 and bonded to the part 10 to be injected.

The depth of the part cavity region 144 corresponding to the inner side of the peripheral wall 106 of the cavity 142 is set to be greater than the depth of the other cavity regions 146. This design makes the plastic material on the peripheral wall 106 of the injection molded part 10 after injection molding. The bonding area is increased, thereby improving the bonding degree of the rubber compound and the part 10 to be injection molded.

The second mold 14 is further provided with a cold slug well 148 communicating with the cavity 142, wherein the part 10 to be injected further includes an extension 101 connected to the peripheral wall 106 and extending to the outside of the part 10 to be injected, wherein the cold slug well 148 is connected to The extension part 101 is provided correspondingly. Because during injection molding, the temperature of the rubber material flowing at the front end is relatively low, that is, the cold material, the setting of the cold material well 148 can make the cold material in the first runner cavity 142 flow into the cold material well 148, so that the cold material is not in the cold material. Molding in the cavity 142 or the gap 102 ensures that the rubber formed in the cavity 142 or the gap 102 is uniform and balanced, thereby improving the adhesive force. The cold material formed in the cold material well 148 can be removed in post-processing.

S203. Inject rubber material into the injection port, so that the rubber material flows radially to the gap through the fan-shaped flow channel, and makes the rubber material flow into the mold cavity through the gap, and then injection molds in the gap and the mold cavity.

In step S203, after the glue is injected into the glue injection port 122, since the fan-shaped flow channel 124 communicates with the glue injection port 122, the glue flows into the fan-shaped flow channel 124 after being injected from the glue injection port 122, and because the fan-shaped flow channel 124 It communicates with the slit 102 , the rubber material flows into the slit 102 radially through the fan-shaped flow channel 124 , and the slit 102 communicates with the mold cavity 142 , so that the rubber material flows into the mold cavity 142 from the slit 102 . After the rubber material is cooled, it is injection molded in the gap 102 and the cavity 142 . Similarly, after the rubber material in the fan-shaped flow channel 124 is cooled, it is also molded on the part 10 to be injected.

As shown in Fig. 10 and Fig. 11, Fig. 10 is a structural schematic diagram of one angle of a product obtained by injection molding provided by another embodiment of the present invention, and Fig. 11 is a structural schematic diagram of another angle of the product of Fig. 10 . Wherein, after the rubber material is cooled in the gap 102, forming rubber material 11 is formed, and its shape is consistent with the shape of the gap 102; The shapes are the same; after the rubber material is cooled in the cold material well 148, forming rubber material 15 is formed, and its shape is consistent with the shape of the cold material well 148; after the rubber material is cooled in the fan-shaped flow channel 124, forming rubber material 17 is formed , whose shape is consistent with the fan-shaped flow channel 124. The product obtained by injection molding can also undergo post-processing, such as removing unnecessary parts of the actual product (such as the extension part 101, the molding compound 15 corresponding to the cold slug well 148, and the forming compound 17 corresponding to the fan-shaped flow channel 124, etc.) , to obtain the final mobile phone shell product.

The present invention also provides an injection mold, which includes the first mold in any one of the above embodiments.

In summary, the present invention can ensure the balance of glue feeding in the injection molding process, improve the adhesive force of injection molded products, reduce the defective rate, and reduce waste.

The above is only the embodiment of the present invention, and does not limit the patent scope of the present invention. Any equivalent structure or equivalent process conversion made by using the description of the present invention and the contents of the accompanying drawings, or directly or indirectly used in other related technologies fields, all of which are equally included in the scope of patent protection of the present invention.

Claims (10)

1. A method of injection molding, characterized in that the method comprises: providing a part to be injected, wherein the part to be injected is provided with a gap; A first mold is provided on one side of the part to be injected, wherein the first mold is provided with an injection port and a fan-shaped flow channel that communicates with the injection port and expands radially relative to the injection port; The glue is injected into the glue injection port, so that the glue flows radially to the gap through the fan-shaped flow channel. 2. The injection molding method according to claim 1, characterized in that, the fan-shaped flow channel is arranged to cover the slit as a whole along the length direction of the slit. 3. The injection molding method according to claim 2, characterized in that, the depth of a part of the runner area at the two side edges of the fan-shaped runner connected to the injection port is set to be greater than the depth of other runner regions. 4 . The injection molding method according to claim 3 , characterized in that, the part of the flow channel region having a relatively large depth is arranged in the shape of a strip extending radially along the injection port. 5 . 5. The injection molding method according to claim 1, wherein the step of providing a first mold on one side of the part to be injected further comprises: A second mold is provided on the other side of the part to be injected, and the second mold is provided with a cavity; The step of injecting sizing material at the injection port includes: The rubber material flows into the mold cavity through the gap, and then is injection-molded in the gap and the mold cavity. 6. The injection molding method according to claim 5, wherein the part to be injected comprises a main side wall and an outer peripheral wall connected to the main side wall, and the main side wall and the outer peripheral wall are surrounded by a depression; The step of providing a first mold on one side of the part to be injected comprises: The first mold is provided on a side of the part to be injected away from the concave part, and the second mold is provided on the other side of the part to be injected facing the concave part. 7. The injection molding method according to claim 5, characterized in that, the depth of a part of the cavity region corresponding to the inner side of the outer peripheral wall of the cavity is set to be greater than the depth of other cavity regions. 8. The injection molding method according to claim 5, wherein the second mold is further provided with a cold slug well communicating with the cavity, wherein the part to be injected includes a The outer extension of the injection molded part is described, wherein the cold slug well is arranged correspondingly to the extension. 9. An injection mold, characterized in that the injection mold is provided with a glue injection port and a fan-shaped flow channel that communicates with the glue injection port and expands radially relative to the glue injection port. 10 . The injection mold according to claim 9 , wherein the depth of a part of the runner area at the two side edges of the fan-shaped runner connected to the injection port is set to be greater than the depth of other runner regions. 11 .