Injection mold for metal insert plastic pipe fitting

Abstract

The utility model belongs to the technical field of molds, and relates to an injection mold for a metal insert plastic pipe fitting. The injection mold comprises a fixed mold and a movable mold, and a fixed mold fixing plate and a top plate are arranged above the fixed mold. In the injection molding process, the metal piece is firstly placed in the cavity, the fixed mold is tightly attached to the movable mold, the lower mold core piece penetrates through the metal piece located in the cavity and abuts against the upper mold core piece, and molten materials are injected into the cavity through the injection molding piece, so that the metal piece is firmly wrapped in PVC materials; due to the fact that the lower mold core part penetrates through the metal part located in the mold cavity to protect internal threads in the metal part, the internal threads are isolated from molten materials, the molten materials are prevented from invading the interior of the metal part to affect the internal threads, the product quality is guaranteed, ejection mold opening is conducted through the ejection demolding part after injection molding is completed, and the production efficiency is improved. And the PVC metal insert product can be conveniently taken out.

Description

TECHNICAL FIELD

[0001] The utility model belongs to mould technical field relates to a metal insert plastic pipe fitting injection mold. BACKGROUND

[0002] In the injection molding industry, the embedding of metal inserts such as nuts, bushings, etc. is a common requirement to enhance the strength and functionality of plastic parts, especially in applications that require fastener connections. The existing metal insert injection mold is easy for the molten material to invade the internal thread of the metal part during the injection molding process, which can affect product quality and reduce the yield. Therefore, it is urgent to design a metal insert plastic pipe fitting injection mold that can overcome the above defects.

[0003] In order to overcome the deficiencies of the prior art, people have been constantly exploring and have proposed various solutions. For example, a kind of injection mold with metal insert plastic part [application number: 202010544580.6] is disclosed in Chinese patent, core III coaxial sleeve is arranged outside core II, core II passes through core III and is arranged, core III is coaxially arranged with lower cavity, core I is coaxially contacted with core II after passing through the shunt; When the mold is closed, core I, core II and core III are surrounded after the left cavity and the right cavity are closed, forming an upper cavity, the upper cavity is communicated with the lower cavity, the core I forms a smooth section of the neck of the mold, the core II forms a sawtooth section of the neck of the mold, the upper section of the core III forms a plastic part body, the middle section is used for accurately positioning the inner hole of the blade, and the lower section is used for determining the height of the blade at the middle section; The left cavity and the right cavity are combined to form the outer surface of the plastic part; The lower cavity is used for forming the tail of the plastic part. However, in the injection molding process, the molten material is still easy to invade the internal thread of the metal part and affect the product quality, and there is a defect that the yield is general. UTILITY MODEL CONTENTS

[0004] The utility model aims at the above problem, and provides a kind of metal insert plastic pipe fitting injection mold.

[0005] To achieve the above object, the utility model adopts the following technical scheme:

[0006] A kind of metal insert plastic pipe fitting injection mold, including fixed mould and movable die, the fixed mould top is equipped with fixed mould fixed plate and top plate, the movable die lower is equipped with stripping plate, when fixed mould and movable die are closely attached, the cavity for placing metal part is formed between fixed mould and movable die, the fixed mould fixed plate is equipped with the upper part core piece that extends and is passed into to the cavity, the stripping plate is equipped with the lower part core piece that extends and is passed into to the cavity and is passed through movable die, when fixed mould and movable die are closely attached, the lower part core piece is passed through the metal part in the cavity and is in contact with the upper part core piece, the top plate is equipped with injection part, the stripping plate lower is equipped with ejection demoulding part.

[0007] In the metal insert plastic pipe fitting injection mold, the lower core member includes a bottom core and a bottom core sleeve arranged in the stripper plate, and when the fixed mold and the movable mold are tightly closed, the bottom core sleeve penetrates through the metal member in the cavity and abuts against the upper core member.

[0008] In the metal insert plastic pipe fitting injection mold, the bottom core is provided with an insert ring groove forming member at the top thereof, and the insert ring groove forming member corresponds to the position of the cavity.

[0009] In the metal insert plastic pipe fitting injection mold, the insert ring groove forming member includes an insert ring groove forming sleeve arranged at the top of the bottom core, and the insert ring groove forming sleeve is staggered with the metal member in the cavity.

[0010] In the metal insert plastic pipe fitting injection mold, the upper core member includes a top core arranged in the fixed mold fixed plate, and the bottom of the top core extends into the cavity and abuts against the bottom core sleeve.

[0011] In the metal insert plastic pipe fitting injection mold, the fixed mold and the movable mold are provided with a positioning mold closing member, and the positioning mold closing member is staggered with the cavity.

[0012] In the metal insert plastic pipe fitting injection mold, the positioning mold closing member includes a positioning column sleeve arranged in the fixed mold, and the movable mold is provided with a positioning column, and the positioning column sleeve corresponds to the position of the positioning column and is matched in shape.

[0013] In the metal insert plastic pipe fitting injection mold, the injection member includes an injection main flow channel arranged in the top plate, the fixed mold fixed plate and the fixed mold are provided with a branch flow channel connected with the injection main flow channel, and the branch flow channel is connected with the cavity.

[0014] In the metal insert plastic pipe fitting injection mold, the ejection demolding member includes a bottom needle plate and a top needle plate arranged below the stripper plate, the top needle plate is provided with an ejection stripper rod penetrating through the movable mold fixed plate and the stripper plate in sequence.

[0015] In the metal insert plastic pipe fitting injection mold, the bottom needle plate is provided with a bottom plate below, and a limiting stand column is arranged between the bottom plate and the movable mold fixed plate, and the limiting stand column penetrates through the bottom needle plate and the top needle plate.

[0016] Compared with the prior art, the metal insert plastic pipe fitting injection mold has the advantages that:

[0017] 1. The utility model discloses a metal piece is placed in the cavity in the injection molding process, and the fixed mode and the movable mode are close, make the lower part core piece through the metal piece in the cavity and be opposite with the upper part core piece, and the molten material is injected into the cavity through the injection molding piece, so that the metal piece is firmly wrapped in the PVC material, because the lower part core piece through the metal piece in the cavity protects the internal thread of the metal piece, makes the internal thread with molten material isolation, avoids the molten material to intrude into the metal piece and influences the internal thread, guarantees the product quality, and the ejection stripper piece is used to eject the mold opening after completing injection molding, and the PVC metal insert product is conveniently taken out.

[0018] 2. The utility model discloses a metal piece is placed in the cavity in the injection molding process, and the fixed mode and the movable mode are close, make the lower part core piece through the metal piece in the cavity and be opposite with the upper part core piece, and the molten material is injected into the cavity through the injection molding piece, so that the metal piece is firmly wrapped in the PVC material, because the lower part core piece through the metal piece in the cavity protects the internal thread of the metal piece, makes the internal thread with molten material isolation, avoids the molten material to intrude into the metal piece and influences the internal thread, guarantees the product quality, and the ejection stripper piece is used to eject the mold opening after completing injection molding, and the PVC metal insert product is conveniently taken out.

[0019] The other advantages, objects and features of the utility model will be embodied partly through the following description, and the skilled in the art will also understand them through the research and practice of the utility model. BRIEF DESCRIPTION OF DRAWINGS

[0020] Figure 1 It is the cross section schematic drawing of the utility model.

[0021] Figure 2 It is the cross section schematic drawing of another direction of the utility model.

[0022] Figure 3 It is the local structure schematic drawing of the utility model.

[0023] Figure 4 It is the structure schematic drawing of the top plate.

[0024] In the drawing: fixed mode 1, movable mode 2, fixed mode fixed plate 3, top plate 4, stripping plate 5, cavity 6, upper part core piece 7, lower part core piece 8, injection molding piece 9, ejection stripper 10, bottom core 11, bottom core cover 12, insert ring groove forming piece 13, insert ring groove forming cylinder cover 14, top core 15, positioning die holder 16, positioning column cover 17, positioning column 18, injection molding main runner 19, bottom needle plate 20, top needle plate 21, movable mode fixed plate 22, stripping ejector pin 23, bottom plate 24, limit vertical column 25, metal piece 100. DETAILED DESCRIPTION

[0025] The utility model will be further explained below in combination with the drawings.

[0026] As Figures 1-4As shown, a metal insert plastic pipe fitting injection mold includes a fixed mold 1 and a movable mold 2, the fixed mold 1 is provided with a fixed mold fixed plate 3 and a top plate 4 above, the movable mold 2 is provided with a stripping plate 5 below, when the fixed mold 1 and the movable mold 2 are tightly attached, a cavity 6 for placing a metal part 100 is formed between the fixed mold 1 and the movable mold 2, the fixed mold fixed plate 3 is provided with an upper core part 7 extending into the cavity 6, the stripping plate 5 is provided with a lower core part 8 extending through the movable mold 2 and into the cavity 6, when the fixed mold 1 and the movable mold 2 are tightly attached, the lower core part 8 penetrates through the metal part 100 in the cavity 6 and abuts against the upper core part 7, the top plate 4 is provided with an injection part 9, and the stripping plate 5 is provided with an ejection stripping part 10 below.

[0027] In this embodiment, during the injection process, the metal part 100 is first placed in the cavity, the fixed mold 1 and the movable mold 2 are tightly attached, the lower core part 8 penetrates through the metal part 100 in the cavity 6 and abuts against the upper core part 7, the molten material is injected into the cavity through the injection part 9, so that the metal part 100 is tightly wrapped in the PVC material, and the lower core part 8 penetrates through the metal part 100 in the cavity 6 to protect the internal thread inside the metal part 100, so that the internal thread is isolated from the molten material, avoiding the molten material from invading the inside of the metal part 100 to affect the internal thread, ensuring the product quality, and after the injection is completed, the ejection stripping part 10 is used for ejection and mold opening, facilitating the taking out of the PVC metal insert product.

[0028] In combination Figures 1-4 As shown, the lower core part 8 includes a bottom core 11 and a bottom core sleeve 12 arranged in the stripping plate 5, when the fixed mold 1 and the movable mold 2 are tightly attached, the bottom core sleeve 12 penetrates through the metal part 100 in the cavity 6 and abuts against the upper core part 7, the upper core part 7 includes a top core 15 arranged in the fixed mold fixed plate 3, and the bottom of the top core 15 extends into the cavity 6 and can abut against the bottom core sleeve 12.

[0029] Specifically, during the injection process, the bottom core sleeve 12 penetrates through the metal part 100 in the cavity 6 and abuts against the top core 15, and cooperates with the bottom core 11 and the cavity to form a PVC metal insert product, and the bottom core sleeve 12 penetrates through the metal part 100 in the cavity 6 to protect the internal thread inside the metal part 100, so that the internal thread is isolated from the molten material, avoiding the molten material from invading the inside of the metal part 100 to affect the internal thread, ensuring the product quality.

[0030] The top of the bottom core 11 is provided with an insert ring groove forming part 13, which corresponds to the position of the cavity 6.

[0031] In the embodiment, during the injection molding process, the insert ring groove forming part 13 extends into the cavity 6, and the insert ring groove forming part 13 is used to synchronously form the ring groove structure of the PVC metal insert product, without the need for secondary processing, thereby shortening the process and reducing the production cost.

[0032] In combination with FIG. 1, Figure 1 , Figure 2 As shown in the drawings, the insert ring groove forming part 13 includes an insert ring groove forming sleeve 14 arranged on the top of the bottom core 11, and the insert ring groove forming sleeve 14 is staggered with the metal part 100 in the cavity 6.

[0033] In the embodiment, during the injection molding process, the insert ring groove forming sleeve 14 extends into the cavity 6, and the insert ring groove forming sleeve 14 is used to synchronously form the ring groove structure of the PVC metal insert product, without the need for secondary processing, thereby shortening the process and reducing the production cost. The insert ring groove forming sleeve 14 is staggered with the metal part 100 in the cavity 6, thereby avoiding interference with the metal part 100.

[0034] In combination with FIG. 1, Figure 2 As shown in the drawings, the fixed mold 1 and the movable mold 2 are provided with a positioning mold closing part 16, and the positioning mold closing part 16 is staggered with the cavity 6.

[0035] In the embodiment, during mold closing, the positioning mold closing part 16 can achieve precise positioning, and the positioning precision is high.

[0036] The positioning mold closing part 16 includes a positioning column sleeve 17 arranged in the fixed mold 1, and the movable mold 2 is provided with a positioning column 18, and the positioning column sleeve 17 corresponds to the position of the positioning column 18 and is matched in shape.

[0037] In the embodiment, during mold closing, the positioning column sleeve 17 cooperates with the positioning column 18 to achieve precise positioning, and the positioning precision is high.

[0038] In combination with FIG. 1, Figures 1-4 As shown in the drawings, the injection molded part 9 includes an injection main flow channel 19 arranged in the top plate 4, the fixed mold plate 3 and the fixed mold 1 have a branch flow channel connected with the injection main flow channel 19, and the branch flow channel is connected with the cavity 6.

[0039] In the embodiment, during the injection molding process, the molten material is injected into the cavity through the injection main flow channel 19 and the branch flow channel system. Those skilled in the art should understand that the branch flow channel system is prior art, and its internal structure and working principle are not the focus of the present patent, and therefore will not be described in detail.

[0040] In combination with FIG. 1, Figures 1-2As shown, the ejection stripper 10 comprises a bottom pin plate 20 arranged below the stripper plate 5, and a top pin plate 21 arranged between the stripper plate 5 and a movable mold fixed plate 22, the top pin plate 21 is provided with a stripper ejector rod 23 which penetrates through the movable mold fixed plate 22 and the stripper plate 5 in sequence, and the bottom pin plate 20 is provided with a bottom plate 24 below the bottom pin plate 20, and a limiting stand 25 is arranged between the bottom plate 24 and the movable mold fixed plate 22, and the limiting stand 25 penetrates through the bottom pin plate 20 and the top pin plate 21.

[0041] In this embodiment, after the injection molding is completed, the bottom pin plate 20 and the top pin plate 21 are moved upwards to drive the stripper ejector rod 23 to separate the movable mold and the stripper plate 5, and then the movable mold and the fixed mold are separated, and the PVC metal insert product can be taken out, and during the movement of the bottom pin plate 20 and the top pin plate 21, the limiting stand 25 limits the bottom pin plate 20, the top pin plate 21 and the stripper ejector rod 23, so that the stripper ejector rod 23 is prevented from being angularly deviated.

[0042] The working principle of the utility model is:

[0043] During the injection molding process, the metal part 100 is first placed in the cavity, the fixed mold 1 and the movable mold 2 are tightly attached, the molten material is injected into the cavity through the injection main runner 19 and the shunt system, so that the metal part 100 is tightly wrapped in the PVC material, the bottom core sleeve 12 penetrates through the metal part 100 in the cavity 6 and abuts against the top core 15, and the bottom core 11 and the cavity are cooperated to form the PVC metal insert product, since the bottom core sleeve 12 penetrates through the metal part 100 in the cavity 6 to protect the internal thread of the metal part 100, the internal thread is isolated from the molten material, so that the molten material is prevented from invading the internal thread of the metal part 100, and the product quality is ensured, after the injection molding is completed, the bottom pin plate 20 and the top pin plate 21 are moved upwards to drive the stripper ejector rod 23 to separate the movable mold and the stripper plate 5, and then the movable mold and the fixed mold are separated, and the PVC metal insert product can be taken out, and during the movement of the bottom pin plate 20 and the top pin plate 21, the limiting stand 25 limits the bottom pin plate 20, the top pin plate 21 and the stripper ejector rod 23, so that the stripper ejector rod 23 is prevented from being angularly deviated,

[0044] During the injection molding process, the insert ring groove forming cylinder sleeve 14 extends into the cavity 6, and the insert ring groove forming cylinder sleeve 14 is used to synchronously form the ring groove structure of the PVC metal insert product, so that secondary processing is not needed, the process is shortened, and the production cost is reduced, and the insert ring groove forming cylinder sleeve 14 is staggered with the metal part 100 in the cavity 6, so that interference with the metal part 100 is avoided,

[0045] During the mold closing, the positioning mold closing member 16 can realize accurate positioning, and the positioning accuracy is high.

[0046] The specific embodiments described herein are merely illustrative of the spirit of the present application. Those skilled in the art of the present application can make various modifications or supplements to the described specific embodiments or use similar ways to replace them, without deviating from the spirit of the present application.

[0047] Although the terms such as fixed die 1, movable die 2, fixed die fixing plate 3, top plate 4, stripping plate 5, cavity 6, upper core part 7, lower core part 8, injection molded part 9, ejection stripping part 10, bottom core 11, bottom core sleeve 12, insert ring groove forming part 13, insert ring groove forming sleeve 14, top core 15, positioning mold closing part 16, positioning column sleeve 17, positioning column 18, injection main runner 19, bottom needle plate 20, top needle plate 21, movable die fixing plate 22, stripping top rod 23, bottom plate 24, limiting vertical column 25, metal part 100 are used more frequently herein, the possibility of using other terms is not excluded. The use of these terms is merely for the convenience of describing and explaining the essence of the present application, and it is contrary to the spirit of the present application to interpret them as any kind of additional limitation.

Claims

1. A metal insert plastic pipe fitting injection mold, comprising a fixed mold (1) and a movable mold (2), a fixed mold fixing plate (3) and a top plate (4) are arranged above the fixed mold (1), a stripper plate (5) is arranged below the movable mold (2), characterized in that, When the fixed mold (1) and the movable mold (2) are tightly closed, a cavity (6) for placing a metal part (100) is formed between the fixed mold (1) and the movable mold (2), the fixed mold fixing plate (3) is provided with an upper core part (7) extending into the cavity (6), the stripper plate (5) is provided with a lower core part (8) extending through the movable mold (2) and into the cavity (6), when the fixed mold (1) and the movable mold (2) are tightly closed, the lower core part (8) penetrates through the metal part (100) in the cavity (6) and abuts against the upper core part (7), the top plate (4) is provided with an injection part (9), and the stripper plate (5) is provided with an ejection demolding part (10) below.

2. The metal insert plastic pipe fitting injection mold of claim 1, wherein, The lower core part (8) comprises a bottom core (11) and a bottom core sleeve (12) arranged in the stripper plate (5), when the fixed mold (1) and the movable mold (2) are tightly closed, the bottom core sleeve (12) penetrates through the metal part (100) in the cavity (6) and abuts against the upper core part (7).

3. The insert-molded metal pipe fitting injection mold of claim 2, wherein, The bottom core (11) is provided with an insert ring groove forming part (13) at the top, and the insert ring groove forming part (13) corresponds to the position of the cavity (6).

4. The insert-molded metal pipe fitting injection mold of claim 3, wherein, The insert ring groove forming part (13) comprises an insert ring groove forming sleeve (14) arranged at the top of the bottom core (11), and the insert ring groove forming sleeve (14) is staggered with the metal part (100) in the cavity (6).

5. The insert-molded metal pipe fitting injection mold of claim 4, wherein, The upper core part (7) comprises a top core (15) arranged in the fixed mold fixing plate (3), and the top core (15) extends into the cavity (6) at the bottom and can abut against the bottom core sleeve (12).

6. The metal insert plastic pipe fitting injection mold of claim 5, wherein, The fixed mold (1) and the movable mold (2) are provided with a positioning mold closing part (16), and the positioning mold closing part (16) is staggered with the cavity (6).

7. The insert-molded metal pipe fitting injection mold of claim 6, wherein, The positioning mold closing part (16) comprises a positioning column sleeve (17) arranged in the fixed mold (1), the movable mold (2) is provided with a positioning column (18), the positioning column sleeve (17) corresponds to the position of the positioning column (18) and is matched in shape.

8. The metal insert plastic pipe fitting injection mold of claim 7, wherein, The injection part (9) comprises an injection main flow channel (19) arranged in the top plate (4), the fixed mold fixing plate (3) and the fixed mold (1) are provided with a branch flow channel communicating with the injection main flow channel (19), and the branch flow channel is connected with the cavity (6).

9. The metal insert plastic pipe fitting injection mold of claim 8, wherein, The ejection demolding part (10) comprises a bottom needle plate (20) and a top needle plate (21) arranged below the stripper plate (5), a movable mold fixing plate (22) is arranged between the top needle plate (21) and the stripper plate (5), and the top needle plate (21) is provided with a stripping ejector rod (23) penetrating through the movable mold fixing plate (22) and the stripper plate (5) in sequence.

10. The metal insert plastic pipe fitting injection mold of claim 9, wherein, A bottom plate (24) is arranged below the bottom needle plate (20), a limiting stand column (25) is arranged between the bottom plate (24) and the movable mold fixing plate (22), and the limiting stand column (25) penetrates through the bottom needle plate (20) and the top needle plate (21).

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