High pressure die for annular metal rubber products

Abstract

The high-pressure mold for annular metal rubber product comprises a glue injection cylinder with a glue injection cavity, a top die arranged on the top surface of the glue injection cylinder, a bottom die arranged below the glue injection cylinder, a mold core arranged between the glue injection cylinder and the bottom die along the central axis of the glue injection cylinder, and an annular mold base arranged coaxially outside the mold core between the glue injection cylinder and the bottom die, a glue injection plug fixed on the bottom surface of the top die and matched with the glue injection cavity, and an annular product cavity formed between the mold core and the annular mold base, characterized in that the mold core extends into the glue injection cylinder, the mold core is provided with a glue injection hole communicating the glue injection cavity and the product cavity, and the annular mold base is provided with an exhaust hole communicating with the product cavity. The mold can effectively reduce the mold opening size of the glue injection cylinder, reduce the mold opening cost, ensure that the glue injection cylinder has sufficient connection space with the machine table, improve the glue injection efficiency and shorten the glue injection time, the glue injection hole is arranged on the mold core, the glue flow channel is shorter, the residual glue in the flow channel is easier to clean, the product bubble rate can be effectively reduced, the product density can be improved, and the product quality can be improved.

Description

Technical Field

[0001] This invention relates to a high-pressure mold for annular metal rubber products, belonging to the field of manufacturing technology for annular metal rubber products. Background Technology

[0002] The structure of the ring-shaped metal rubber product is shown in the attached figure. Figure 1 As shown, it is composed of an upper iron layer 101, a middle rubber layer, and a lower iron component 102, and features a large diameter, low height, and high rigidity requirements. Large-diameter structures are formed using high-pressure molds, typically employing side injection molding, but this presents the following problems:

[0003] 1. The diameter of the injection cavity of the mold needs to be larger than the outer diameter of the product, which results in a large mold injection cylinder design, high mold opening cost, and cramped machine installation size.

[0004] 2. Using a round or solid-piece injection stopper can lead to insufficient injection pressure due to its large size, which may result in defects in product density. On the other hand, when using a ring-shaped injection stopper, the corresponding injection cavity is also a ring structure, and its large diameter makes it difficult to fill the material.

[0005] 3. Gas inside the product cavity converges from the outside to the mold core, causing poor venting and resulting in air bubbles in the mold core area.

[0006] 4. The mold has long flow channels for the colloid, resulting in low flow efficiency, long injection time, and difficulty in cleaning the colloid channels. Summary of the Invention

[0007] The high-pressure mold for annular metal rubber products provided by this invention can effectively reduce the mold opening size of the injection cylinder, reduce mold opening costs, increase the end face size of the injection cylinder, ensure sufficient connection space between the injection cylinder and the machine, achieve high injection efficiency and short time, and the injection hole is opened on the mold core, resulting in a shorter colloid flow channel and easier cleaning of residual colloid in the flow channel. This can effectively reduce the bubble rate of the product, improve the density of the product, and improve the product quality.

[0008] To achieve the above objectives, the technical solution adopted by the present invention is as follows:

[0009] A high-pressure mold for annular metal rubber products includes an injection cylinder with an injection cavity, a top mold disposed on the top surface of the injection cylinder, a bottom mold located below the injection cylinder, a mold core disposed between the injection cylinder and the bottom mold and along the central axis of the injection cylinder, and an annular mold base disposed between the injection cylinder and the bottom mold and coaxially disposed on the outer periphery of the mold core. An injection plug that mates with the injection cavity is fixed on the bottom surface of the top mold, forming an annular product cavity between the mold core and the annular mold base. The mold core extends into the injection cylinder, and an injection hole connecting the injection cavity and the product cavity is opened on the mold core. An vent hole communicating with the product cavity is opened on the annular mold base.

[0010] Preferably, the injection cylinder has a central hole for the mold core to extend into, the central hole is coaxially connected with the injection cylinder, the mold core extends into the central hole, and the injection hole extends downward from the upper end of the mold core and is connected to the product cavity.

[0011] Preferably, the injection hole includes a polyurethane upper cavity opened downward from the upper end of the mold core and a lower injection hole connecting the polyurethane upper cavity and the product cavity. The polyurethane upper cavity is coaxially connected with the injection cavity and its diameter is smaller than that of the injection cavity. The lower injection hole is located below the polyurethane upper cavity and is symmetrically distributed around the central axis of the mold core.

[0012] Preferably, the upper cavity of the polypropylene is a conical cavity with a diameter that gradually decreases from top to bottom, and the lower injection hole is connected to the bottom of the upper cavity of the polypropylene, and the lower injection hole is a conical hole with a width that gradually decreases from top to bottom.

[0013] Preferably, the sidewall of the mold core is divided into an upper sidewall that contacts and fits with the wall of the central hole and a lower sidewall that forms the inner wall of the product cavity. An inner annular step surface is formed between the upper sidewall and the lower sidewall that abuts against the inner end of the upper iron part of the product. The lower end of the injection hole extends to the lower sidewall.

[0014] Preferably, the top surface of the bottom mold has a positioning groove for the lower iron part of the product, and the top surface of the annular mold base has an outer annular stepped surface that abuts against the outer end of the upper iron part of the product.

[0015] Preferably, the exhaust holes are arranged radially along the annular mold base, and multiple holes are evenly arranged circumferentially along the annular mold base. The exhaust holes consist of inner air holes and outer air holes. The inner diameter of the outer air hole is larger than the inner diameter of the inner air hole. The inner end of the inner air hole extends to the inner annular surface of the annular mold base, and the outer end of the outer air hole extends to the outer annular surface of the annular mold base.

[0016] Preferably, the mold core extends into the central hole and is fixed to the injection cylinder, the upper end face of the mold core is flush with the bottom surface of the injection cavity, and the annular mold base and the bottom mold are detachably connected.

[0017] The beneficial effects of the invention are:

[0018] 1. The high-pressure mold for the annular metal rubber product of the present invention has a mold core extending into the injection cylinder, and an injection hole connecting the injection cavity and the product cavity is opened on the mold core. The injection hole is opened on the mold core, that is, located at the center of the mold. The diameter of the injection cavity only needs to be larger than the diameter of the injection hole, which can effectively reduce the mold opening size of the injection cylinder, reduce the mold opening cost, increase the end face size of the injection cylinder, and ensure that the injection cylinder and the machine have sufficient connection space.

[0019] 2. The reduction in the size of the injection cavity leads to a corresponding reduction in the size of the corresponding injection plug. The injection plug adopts a circular or square shape, which facilitates the addition of the glue and concentrates the injection pressure, resulting in greater internal pressure and stronger fluidity of the glue. The glue flows under pressure from the injection cavity through the injection hole into the product cavity. The glue flow channel is shorter, resulting in higher injection efficiency and shorter time. This avoids defects such as poor sealing caused by uneven injection pressure due to a large injection plug size, which leads to poor glue flow. This effectively improves product quality. The injection hole is located on the mold core, resulting in a shorter glue flow channel and easier cleaning of residual glue in the flow channel.

[0020] 3. The colloid flows from the injection hole into the product cavity, gradually filling the cavity radially from the inside out. The gas inside the product cavity is pushed to the vent hole from the inside out and discharged from the vent hole, forming a filling process of colloid filling and venting at the same time. This ensures effective gas discharge and avoids air bubbles in the mold core area of ​​the product. The vent hole is located at the outer ring surface of the product, which gathers the gas on the outer ring and discharges it in time, which can effectively reduce the bubble rate of the product, increase the density of the product, and improve the product quality. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of a ring-shaped metal rubber product.

[0022] Figure 2 This is a schematic diagram of a high-pressure mold for a ring-shaped metal-rubber product.

[0023] Figure 3 This is a schematic diagram of the molding of a ring-shaped metal-rubber product in a high-pressure mold.

[0024] Figure 4 This is a schematic diagram of the combination of the injection cylinder, bottom mold, and ring mold base.

[0025] Figure 5 This is a schematic diagram of the mold core. Detailed Implementation

[0026] The following is combined Figures 2-5 The embodiments of the present invention will be described in detail below.

[0027] A high-pressure mold for annular metal rubber products includes an injection cylinder 2 with an injection cavity 1, a top mold 3 disposed on the top surface of the injection cylinder 2, a bottom mold 4 located below the injection cylinder 2, a mold core 5 disposed between the injection cylinder 2 and the bottom mold 4 and along the central axis of the injection cylinder 2, and an annular mold base 6 disposed between the injection cylinder 2 and the bottom mold 4 and coaxially disposed on the outer periphery of the mold core 5. An injection plug 8 that mates with the injection cavity 1 is fixed on the bottom surface of the top mold 3, forming an annular product cavity 7 between the mold core 5 and the annular mold base 6. The mold core 5 extends into the injection cylinder 2, and an injection hole 9 connecting the injection cavity 1 and the product cavity 7 is opened on the mold core 5. An vent hole 10 communicating with the product cavity 7 is opened on the annular mold base 6.

[0028] The high-pressure mold for the ring-shaped metal rubber product described above has a mold core 5 extending into the injection cylinder 2. An injection hole 9 connecting the injection cavity 1 and the product cavity 7 is opened on the mold core 5. The injection hole 9 is opened on the mold core 5, that is, located at the center of the mold. The diameter of the injection cavity 1 only needs to be larger than the diameter of the injection hole 9, which can effectively reduce the mold opening size of the injection cylinder 2, reduce the mold opening cost, increase the end face size of the injection cylinder 2, and ensure that the injection cylinder 2 and the machine have sufficient connection space. The reduction in the size of the injection cavity 1 leads to a corresponding reduction in the size of the injection plug 8. The injection plug 8 adopts a circular or square shape, which facilitates the addition of the glue and concentrates the injection pressure, resulting in greater internal pressure and stronger fluidity of the glue. The glue flows under pressure from the injection cavity 1 through the injection hole 9 into the product cavity 7. The glue flow channel is shorter, resulting in higher injection efficiency and shorter time. This avoids the defects of poor sealing caused by uneven glue flow due to large injection plug size and uneven injection pressure. The injection hole 9 is located on the mold core 5, making the glue flow channel shorter and the residual glue in the channel easier to clean. The colloid flows from the injection hole 9 into the product cavity 7, gradually filling the product cavity 7 radially from the inside out. The gas in the product cavity 7 is pushed from the inside out to the vent hole 10 and discharged from the vent hole 10, forming a filling process in which the colloid is filled and vented at the same time. This ensures the effective discharge of gas and avoids the formation of air bubbles in the mold core area of ​​the product. The vent hole 10 is located at the outer ring surface of the product, which gathers the gas on the outer ring surface of the product and discharges it in time through the vent hole 10. This can effectively reduce the bubble rate of the product, increase the density of the product, and improve the quality of the product.

[0029] The injection cylinder 2 has a central hole 21 for the mold core 5 to extend into. The central hole 21 is coaxially connected with the injection cylinder 1. The mold core 5 extends into the central hole 21, and the injection hole 9 extends downward from the upper end of the mold core 5 and is connected to the product cavity 7. As shown in the attached diagram, the central hole 21 is connected to the lower part of the injection cavity 1. The mold core 5 extends into the central hole 21, that is, the injection hole 9 is set in the central hole 21, forming a connection between the injection hole 9 and the injection cavity 1. The injection hole 9 extends downward and connects with the product cavity 7, forming a top-to-bottom connection between the injection cavity 1, the injection hole 9 and the product cavity 7. The connection position is located on the mold core 5, at the center of the mold. The injection cavity 1 and the injection hole 9 are connected, and the glue channel path formed in the injection hole 9 is shorter. Compared with the existing technology of opening the side arm of the injection cavity and connecting with the glue channel, the required inner diameter of the injection cavity is smaller. The inner diameter of the injection cavity 1 only needs to be larger than the inner diameter of the injection hole 9. The mold opening size of the injection cavity 1 is smaller, making it easier to open and form the mold. It forms a round or square injection cavity 1, without the need to form an annular injection cavity, avoiding the defect of difficult filling of an annular injection cavity.

[0030] The injection hole 9 includes a polypropylene upper cavity 91 extending downwards from the upper end of the mold core 5 and a lower injection hole 92 connecting the polypropylene upper cavity 91 and the product cavity 7. The polypropylene upper cavity 91 is coaxially connected to the injection cavity 1 and has a smaller diameter than the injection cavity 1. The lower injection hole 92 is located below the polypropylene upper cavity 91 and is symmetrically distributed around the central axis of the mold core 5. The polypropylene upper cavity 91 is located at the bottom of the injection cavity 1 and is directly connected to it. When the injection plug 8 is pressed down, the colloid in the injection cavity 1 is forced into the polypropylene upper cavity 91. The smaller volume of the polypropylene upper cavity 91 increases the pressure of the colloid, causing it to flow into the lower injection hole 92 and then into the product cavity 7, forming a flow process from the injection cavity 1, the polypropylene upper cavity 91, the lower injection hole 92 to the product cavity 7. After entering the product cavity 7, the colloid gradually fills the product cavity 7 from the inside out, and during the filling process, the gas in the product cavity 7 is discharged through the vent hole 10.

[0031] The upper cavity 91 of the polymer is a conical cavity with a diameter that gradually decreases from top to bottom. The lower injection hole 92 is connected to the bottom of the upper cavity 91 and is a conical hole with a width that gradually decreases from top to bottom. The conical shape of the upper cavity 91 increases the pressure of the colloid and avoids pressure loss when the colloid flows into the upper cavity 91. The lower injection hole 92 further increases the pressure, allowing the colloid to be injected into the product cavity 7 in an injection manner, improving the colloid flowability and increasing the injection efficiency.

[0032] The mold core 5 has a sidewall divided into an upper sidewall 52 that contacts and engages with the wall of the central hole 21, and a lower sidewall 53 that forms the inner wall of the product cavity. An inner annular stepped surface 54 is formed between the upper sidewall 52 and the lower sidewall 53, abutting against the inner end of the upper metal part of the product. The lower end of the injection hole 92 extends onto the lower sidewall 53. The inner annular stepped surface 54 positions the upper metal part of the product.

[0033] The bottom mold 4 has a positioning groove 31 on its top surface for positioning the lower iron part of the product, and the annular mold base 6 has an outer annular stepped surface 61 that abuts against the outer end of the upper iron part of the product. The outer annular stepped surface 61 and the inner annular stepped surface 54 cooperate to support and position the upper iron part of the product, while the positioning groove 31 positions the lower iron part of the product, facilitating the effective positioning of the iron part in the product cavity before glue injection.

[0034] The vent holes 10 are radially arranged along the annular mold base 6, and multiple vent holes 10 are evenly arranged circumferentially along the annular mold base 6. Each vent hole 10 consists of an inner vent hole 11 and an outer vent hole 12. The inner diameter of the outer vent hole 12 is larger than that of the inner vent hole 11. The inner end of the inner vent hole 11 extends to the inner annular surface of the annular mold base 6, and the outer end of the outer vent hole 12 extends to the outer annular surface of the annular mold base 6. The inner diameter of the inner vent hole 11 is smaller, which increases the exhaust pressure. During the glue injection process, the gas in the product cavity 7 is discharged from the inside out through the vent holes 10, ensuring that the product in the product cavity 7 is smoothly discharged with the glue injection, effectively reducing the product's bubble rate, increasing the product's density, and improving product quality.

[0035] The mold core 5 extends into the central hole 21 and is fixed to the injection cylinder 2. The upper end face of the mold core 5 is flush with the bottom surface of the injection cavity 1. The annular mold base 6 is detachably connected to the bottom mold 4. This facilitates demolding after injection molding. The mold core 5 and the injection cylinder 2 rise synchronously to separate from the product. The annular mold base 6 is removed from the bottom mold 4, and the product is separated from the annular mold base 6, allowing the product to be removed from the bottom mold.

[0036] The process of forming a ring-shaped metal-rubber product using high-pressure mold injection is as follows:

[0037] First, place the lower iron part 102 of product 100 on the iron part positioning groove 31;

[0038] Next, the annular mold base 6 is mounted on the bottom mold 4, and the upper iron part 101 of the product 100 is placed on the outer annular stepped surface 61.

[0039] Then, the injection cylinder 2, the mold core 5, and the bottom mold 4 are joined together to form the product cavity 7;

[0040] Next, the adhesive is poured into the injection cavity 1, and the adhesive is injected into the product cavity 7 by the downward pressure of the top mold 3 and the injection plug 8.

[0041] After the iron parts and the colloid are bonded together, lift the injection cylinder 2 to separate the mold core 5 from the product, then remove the ring mold base 6 from the bottom mold 4 and separate the product from the ring mold base 6. The product can then be removed from the bottom mold.

[0042] The technical solutions of the embodiments of the present invention have been fully described above with reference to the accompanying drawings. It should be noted that the described embodiments are only a part of the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

Claims

1. A high-pressure mold for annular metal rubber products, comprising an injection cylinder with an injection cavity, a top mold disposed on the top surface of the injection cylinder, a bottom mold located below the injection cylinder, a mold core disposed between the injection cylinder and the bottom mold and along the central axis of the injection cylinder, and an annular mold base disposed between the injection cylinder and the bottom mold and coaxially disposed on the outer periphery of the mold core, wherein an injection plug that mates with the injection cavity is fixed on the bottom surface of the top mold, and an annular product cavity is formed between the mold core and the annular mold base, characterized in that: The mold core extends into the injection cylinder, and the mold core has an injection hole that connects the injection cavity and the product cavity. The annular mold base has an exhaust hole that connects to the product cavity. The injection cylinder has a central hole for the mold core to extend into. The central hole is coaxially connected with the injection cylinder. The mold core extends into the central hole, and the injection hole extends downward from the upper end of the mold core and is connected to the product cavity. The injection hole includes a polyurethane upper cavity opened downward from the upper end of the mold core and a lower injection hole connecting the polyurethane upper cavity and the product cavity. The polyurethane upper cavity is coaxially connected with the injection cavity and its diameter is smaller than that of the injection cavity. The lower injection hole is located below the polyurethane upper cavity and is symmetrically distributed around the central axis of the mold core.

2. The high-pressure mold for the annular metal-rubber product according to claim 1, characterized in that: The upper cavity of the polypropylene is a conical cavity with a diameter that gradually decreases from top to bottom. The lower injection hole is connected to the bottom of the upper cavity of the polypropylene and is a conical hole with a width that gradually decreases from top to bottom.

3. The high-pressure mold for the annular metal-rubber product according to claim 2, characterized in that: The sidewall of the mold core is divided into an upper sidewall that contacts and fits with the wall of the central hole and a lower sidewall that forms the inner wall of the product cavity. An inner annular step surface is formed between the upper and lower sidewalls that abuts against the inner end of the upper iron part of the product. The lower end of the injection hole extends to the lower sidewall.

4. The high-pressure mold for the annular metal-rubber product according to claim 3, characterized in that: The bottom mold has a positioning groove for the lower iron part of the product on its top surface, and the top surface of the annular mold base has an outer annular stepped surface that abuts against the outer end of the upper iron part of the product.

5. The high-pressure mold for the annular metal-rubber product according to claim 1, characterized in that: The exhaust holes are arranged radially along the annular mold base, and multiple holes are evenly arranged circumferentially along the annular mold base. The exhaust holes consist of inner air holes and outer air holes. The inner diameter of the outer air hole is larger than the inner diameter of the inner air hole. The inner end of the inner air hole extends to the inner annular surface of the annular mold base, and the outer end of the outer air hole extends to the outer annular surface of the annular mold base.

6. The high-pressure mold for the annular metal-rubber product according to claim 1, characterized in that: The mold core extends into the central hole and is fixed to the injection cylinder. The upper end face of the mold core is flush with the bottom surface of the injection cavity. The annular mold base and the bottom mold are detachably connected.

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