Multi-cavity precision molding injection mold

Abstract

The utility model discloses a multi-cavity precision molding injection mold which comprises a movable mold and a fixed mold connected to one side of the movable mold, the three cavities are formed in the inner side surface of the fixed mold; the pouring assembly comprises a pouring opening formed in the outer side surface of the fixed mold and a main runner formed in the fixed mold and communicated with the pouring opening; by means of the designed pressure balance assembly, after materials flow into all the branch runners through the main runner, the materials can be blocked by baffles, pressure sensors in the baffles can sense pressure, in the initial stage, the pressure of the materials in the branch runners closest to the main runner is the maximum, and the materials in the branch runners are blocked by the baffles along with continuous feeding of the materials and blocking of the baffles; when the material in each sub-runner is pressed, the pressure of the material in each sub-runner tends to be balanced, at the moment, the hydraulic rod is started to open the baffle, and the material in the sub-runner enters the cavity from the sprue at the same flow speed and the same density, so that a plurality of products with the same specification are formed.

Description

Technical Field

[0001] This utility model belongs to the field of injection mold technology, specifically relating to a multi-cavity precision molding injection mold. Background Technology

[0002] Injection molds are precision tools used for the mass production of plastic products. They are formed by injecting molten plastic into a cavity and allowing it to solidify. Their core structure includes the cavity and core, gating system, guiding mechanism, demolding device, and temperature control system. The cavity is the structure used for molding. To allow injection molds to mold multiple products at once, some molds have multiple cavities inside; these are called multi-cavity injection molds.

[0003] For multi-cavity injection molds, each cavity needs to be equipped with a runner. When the material enters from the main runner, it will enter each runner separately, and then enter the cavity through the gate at the end of the runner to be molded. However, due to the different distances between each runner and the main runner, the flow rate, density and other parameters of the material inside each runner are different. After the material with different parameters enters the cavity, the specifications of the formed product will have a certain deviation. Therefore, a new type of multi-cavity injection mold needs to be designed to solve this problem. Utility Model Content

[0004] The purpose of this invention is to provide a multi-cavity precision injection mold to solve the problem of differences in the flow rate and density of materials inside the flow channels mentioned in the background art.

[0005] To achieve the above objectives, this utility model provides the following technical solution: a multi-cavity precision injection mold, comprising...

[0006] Moving mold, and fixed mold connected to one side of the moving mold;

[0007] Three cavities are formed on the inner surface of the fixed mold;

[0008] The gating assembly includes a gating gate on the outer surface of the fixed mold, a main runner in the fixed mold and communicating with the gating gate, a branch runner connected to one end of the main runner and adapted to the number of cavities, and a gate connected to the end of the branch runner, wherein the gate communicates with the cavity.

[0009] The pressure balancing assembly includes a top groove formed on the top surface of the fixed mold, an electrical control box installed inside the top groove, three strip grooves passing through the top groove and the runner, a hydraulic rod connected to the bottom surface of the electrical control box and placed inside the strip grooves, and a baffle fixedly connected to the bottom end of the hydraulic rod and blocking the runner. The pressure balancing assembly is equipped with a pressure sensor inside.

[0010] Preferably, the pressure balancing assembly further includes a side groove and a wire. The side groove is formed on one side of the strip groove, and the wire is disposed inside the side groove, with its two ends connected to the electrical control box and the baffle, respectively.

[0011] Preferably, the pressure balancing assembly further includes a top plate, which is fixed to the top surface of the electrical control box and sealed to the top surface of the top groove.

[0012] Preferably, the pressure balancing assembly further includes bolts, and the top plate is fixedly connected to the top surface of the fixed mold by bolts.

[0013] Preferably, the casting assembly further includes a flow divider plate disposed at the connection between the main flow channel and the branch flow channel, and an arc-shaped buffer channel disposed at the corner of the branch flow channel.

[0014] Preferably, a core adapted to the cavity is provided on one side of the moving mold, and a buffer assembly is provided on one side of the moving mold around the core.

[0015] Preferably, the buffer assembly includes a mounting groove formed on the surface of the moving mold, a mounting frame elastically disposed inside the mounting groove, a buffer washer connected to the outer surface of the mounting frame, a spring abutting between the mounting groove and the mounting frame, an anti-detachment piece fixed to the side of the mounting frame, and an anti-detachment groove formed on the inner wall of the mounting groove and slidably connected to the anti-detachment piece.

[0016] Compared with the prior art, the beneficial effects of this utility model are:

[0017] Through the designed pressure balancing component, when the material flows into the interior of each branch channel through the main channel, the material is blocked by the baffle. The pressure sensor inside the baffle can sense the pressure. In the initial stage, the branch channel closest to the main channel has the greatest pressure of the material inside. As the material continues to flow in and the baffle is blocked, the pressure of the material in each branch channel will tend to be balanced. At this time, the hydraulic rod is activated to open the baffle, and the material inside the branch channel will enter the interior of the cavity from the gate with the same flow rate and the same density, thus forming multiple products of the same specification. Attached Figure Description

[0018] Figure 1 This is a three-dimensional schematic diagram of the present invention;

[0019] Figure 2 This is a top sectional view of the mold of this utility model;

[0020] Figure 3 This is a front sectional view of the pressure balancing component of this utility model;

[0021] Figure 4 This is a partial cross-sectional view of the buffer assembly of this utility model;

[0022] In the diagram: 100, moving mold; 200, fixed mold; 300, gating assembly; 301, sprue; 302, main runner; 303, branch runner; 304, gate; 305, runner plate; 306, curved buffer runner; 400, cavity; 500, pressure balance assembly; 501, top groove; 502, electrical control box; 503, strip groove; 504, hydraulic rod; 505, baffle; 506, side groove; 507, wire; 508, top plate; 509, bolt; 600, core; 700, buffer assembly; 701, mounting groove; 702, mounting frame; 703, buffer washer; 704, spring; 705, anti-detachment plate; 706, anti-detachment groove. Detailed Implementation

[0023] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0024] Example

[0025] Please see Figures 1 to 4 This embodiment provides a technical solution: a multi-cavity precision injection mold, comprising...

[0026] The moving mold 100 and the fixed mold 200 connected to one side of the moving mold 100 are closed together, and injection molding can then be performed.

[0027] Three cavities 400 are formed on the inner surface of the fixed mold 200, and the material is cooled and formed inside the cavities 400;

[0028] The gating assembly 300 includes a gating gate 301 on the outer surface of the fixed mold 200, a main runner 302 inside the fixed mold 200 and communicating with the gating gate 301, a branch runner 303 connected to one end of the main runner 302 and adapted to the number of cavities 400, and a gate 304 connected to the end of the branch runner 303. The gate 304 communicates with the cavity 400. The material enters from the gating gate 301, passes through the main runner 302, and then completes the branching in the branch runner 303.

[0029] The pressure balancing assembly 500 includes a top groove 501 formed on the top surface of the fixed mold 200, an electrical control box 502 installed inside the top groove 501, three strip grooves 503 passing through the top groove 501 and the runner 303, a hydraulic rod 504 connected to the bottom surface of the electrical control box 502 and placed inside the strip grooves 503, and a baffle 505 fixedly connected to the bottom end of the hydraulic rod 504 and blocking the runner 303. The pressure balancing assembly 500 is equipped with a pressure sensor. The material entering the runner 303 is blocked by the baffle 505. The pressure sensor inside the baffle 505 can detect the pressure of the material. As the material is continuously fed in, the pressure inside the different runners 303 gradually tends to be balanced. When the pressure sensor detects that the pressure is balanced, the hydraulic rod 504 opens the baffle 505. At this time, the material passes through the runner 303 and the gate 304 and finally enters the cavity 400 to complete the cooling and molding.

[0030] In this embodiment, preferably, the pressure balancing assembly 500 further includes a side groove 506 and a wire 507. The side groove 506 is formed on one side of the strip groove 503, and the wire 507 is disposed inside the side groove 506, with both ends connected to the electrical control box 502 and the baffle 505 respectively, to complete the electrical connection between the baffle 505 and the electrical control box 502.

[0031] In this embodiment, preferably, the pressure balancing assembly 500 further includes a top plate 508, which is fixed to the top surface of the electrical control box 502 and sealed to the top surface of the top groove 501, thus playing a sealing role.

[0032] In this embodiment, preferably, the pressure balancing assembly 500 further includes bolts 509, and the top plate 508 is fixedly connected to the top surface of the fixed mold 200 by bolts 509, thereby completing the fixation of the pressure balancing assembly 500.

[0033] In this embodiment, preferably, the casting assembly 300 further includes a flow divider 305 disposed at the connection between the main flow channel 302 and the flow divider 303, and an arc-shaped buffer channel 306 disposed at the corner of the flow divider 303. Both the flow divider 305 and the arc-shaped buffer channel 306 enable the material to flow evenly and stably inside the flow divider 303.

[0034] In this embodiment, preferably, a core 600 adapted to the cavity 400 is provided on one side of the moving mold 100, and a buffer assembly 700 is provided on one side of the moving mold 100 around the core 600 to buffer the mold closing process.

[0035] In this embodiment, preferably, the buffer assembly 700 includes a mounting groove 701 formed on the surface of the moving mold 100, a mounting frame 702 elastically disposed inside the mounting groove 701, a buffer washer 703 connected to the outer surface of the mounting frame 702, a spring 704 abutting between the mounting groove 701 and the mounting frame 702, an anti-detachment piece 705 fixed to the side of the mounting frame 702, and an anti-detachment groove 706 formed on the inner wall of the mounting groove 701 and slidably connected to the anti-detachment piece 705. When the mold is closed, the buffer washer 703 can buffer the impact force generated during mold closing, while the spring 704 can improve the buffering effect, and the anti-detachment piece 705 and the anti-detachment groove 706 can prevent the mounting frame 702 from falling off.

[0036] Although embodiments of the present invention have been shown and described (see the detailed description above), it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A multi-cavity precision forming injection mold, characterized by: The utility model relates to a three -cavity injection mould of pressure balance Movable mould (100), fixed mould (200) connected in movable mould (100 one side; Three cavities (400) are set up in the inside surface of fixed mould (200); Pouring assembly (300) including the pouring gate (301) set up in the outside surface of fixed mould (200), the main runner (302) set up in the inside of fixed mould (200) and with the pouring gate (301) pass through, the shunt (303) connected in the main runner (302) one end and with the cavity (400) number adaptation, the sprue (304) connected in the tail end of shunt (303), the sprue (304) with the cavity (400) pass through; Pressure balance assembly (500) including the top groove (501) set up in the top surface of fixed mould (200), the electric control box (502) installed in the top groove (501) inside, three strip grooves (503) through set up between the top groove (501) and shunt (303), the hydraulic rod (504) connected in the bottom surface of electric control box (502) and placed in the strip groove (503) inside, the baffle (505) fixedly connected in the bottom end of hydraulic rod (504) and blocked in the inside of shunt (303), the inside of pressure balance assembly (500) is equipped with pressure sensor.

2. The multi-cavity precision forming injection mold of claim 1, wherein: The pressure balance assembly (500) further includes a side groove (506) and a wire (507), the side groove (506) is set up on one side of the strip groove (503), and the wire (507) is arranged in the side groove (506) and connected with the electric control box (502) and the baffle (505) at both ends.

3. The multi-cavity precision forming injection mold of claim 2, wherein: The pressure balance assembly (500) further includes a top sheet (508), the top sheet (508) is fixed on the top surface of the electric control box (502) and sealed on the top surface of the top groove (501).

4. The multi-cavity precision forming injection mold of claim 3, wherein: The pressure balance assembly (500) further includes a bolt (509), and the top sheet (508) is fixedly connected to the top surface of the fixed mold (200) through the bolt (509).

5. The multi-cavity precision forming injection mold of claim 4, wherein: The pouring assembly (300) further includes a shunt sheet (305) arranged at the connection between the main runner (302) and the shunt (303), and an arc-shaped buffer channel (306) arranged at a corner of the shunt (303).

6. The multi-cavity precision forming injection mold of claim 5, wherein: One side of the movable mold (100) is provided with a core (600) matched with the cavity (400), and a buffer assembly (700) is arranged on the periphery of the core (600) on one side of the movable mold (100).

7. The multi-cavity precision forming injection mold of claim 6, wherein: The buffer assembly (700) includes a mounting groove (701) formed on the surface of the movable mold (100), an installation frame (702) elastically arranged in the mounting groove (701), a buffer gasket (703) connected to the outer surface of the installation frame (702), a spring (704) arranged between the mounting groove (701) and the installation frame (702), a anti-dropping sheet (705) fixed on the side surface of the installation frame (702), and an anti-dropping groove (706) formed on the inner wall of the mounting groove (701) and slidably connected with the anti-dropping sheet (705).

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