Bimetal nozzle core

Abstract

The utility model belongs to the technical field of injection molds, and particularly relates to a bimetal nozzle core, which solves the problem that the nozzle core made of alloy materials cannot simultaneously achieve the two purposes of difficulty in deformation and lower use cost. The bimetal nozzle core comprises an alloy nozzle core body and a high-strength supporting bracket arranged on the alloy nozzle core body in a sleeving mode, a material passing channel is formed in the alloy nozzle core body, an assembly hole is axially formed in the high-strength supporting bracket in a penetrating mode, and the outer wall of the alloy nozzle core body is attached to the inner wall of the assembly hole in a supporting mode. The alloy nozzle core is sleeved with the high-strength supporting bracket to be used for supporting the alloy nozzle core, so that the alloy nozzle core is not prone to deformation, the thickness and the size of the alloy nozzle core can be reduced as much as possible, and cost is controlled.

Description

Technical Field

[0001] The utility model belongs to the technical field of injection molds, in particular to a bimetallic nozzle core. Background Art

[0002] Injection molding is a widely used production process in modern industrial production. It uses a series of operations such as pressurization, injection, and cooling to produce the desired plastic product. The entire process is usually carried out by an injection molding machine. During the injection molding process, the material enters the hot runner system within the injection mold through the main inlet, and then is injected into the mold cavity.

[0003] Alloy materials have good thermal conductivity, corrosion resistance and wear resistance. As a high-quality nozzle core material, they are often used in hot runners. However, alloy materials have disadvantages such as high price, low hardness, low elastic modulus, and easy cracking, which have limited their application.

[0004] Most of the existing technologies for the design of alloy nozzle cores cannot achieve both low cost and high strength at the same time. Utility Model Content

[0005] The purpose of the utility model is to solve the above problems in the prior art and to propose a bimetallic nozzle core.

[0006] In order to achieve the purpose of innovation of this utility model, the following technical solutions can be used:

[0007] A bimetallic nozzle core comprises an alloy nozzle core and a high-strength support bracket sleeved on the alloy nozzle core. A material passing channel is formed in the alloy nozzle core, and an assembly hole is axially penetrated through the high-strength support bracket. The outer wall of the alloy nozzle core and the inner wall of the assembly hole are supported and fitted.

[0008] The bimetallic nozzle core of the present invention is mainly composed of an alloy nozzle core and a high-strength support bracket. The alloy nozzle core is made of alloy material, has good thermal conductivity, corrosion resistance and wear resistance, and is suitable for direct contact with plastic materials. The high-strength support bracket made of high-strength material is sleeved on the alloy nozzle core and has high structural strength. It is used to provide support force to the alloy nozzle core from the outside to prevent the alloy nozzle core from being deformed by force, ensure the stability and accuracy of the material passing channel, and also enable the alloy nozzle core to be designed with a smaller thickness while ensuring the material passing channel, thereby reducing manufacturing costs. The high-strength support bracket can be specifically made of steel.

[0009] In the above-mentioned bimetallic tip, the alloy tip comprises a main body section and a limiting section, the outer wall of the main body section is adapted to the inner diameter of the assembly hole, and the outer wall of the main body section is in contact with the inner wall of the assembly hole.

[0010] Most of the material transfer channel is located in the main section. The main section is cylindrical, and the outer wall is in contact with the assembly hole, that is, it is supported inward by the assembly hole, avoiding deformation of the main section. The limit section and the main section are connected as one, and are mainly used for limiting the docking with the high-strength support bracket to complete the positioning and installation of the alloy nozzle core and the high-strength support bracket.

[0011] In the above-mentioned bimetallic nozzle core, the outer diameter of the main body section is slightly larger than the inner diameter of the assembly hole, and the main body section and the assembly hole are fixed by interference fit.

[0012] The outer diameter of the main section is slightly larger than the assembly hole. During the specific assembly, the alloy nozzle core is cooled with liquid nitrogen and the high-strength support bracket is heated at high temperature. The assembly is carried out under the state of the alloy nozzle core shrinking and the high-strength support bracket expanding, thereby realizing interference fit between the alloy nozzle core and the high-strength support bracket. The two have a good fixing effect, and at the same time ensure that the main section and the inner wall of the assembly hole are in close contact, ensuring good support.

[0013] In the above-mentioned bimetallic nozzle core, a concave stop is provided at the upper end of the assembly hole, the inner diameter of the concave stop is adapted to the outer diameter of the limiting section, the outer diameter of the limiting section is larger than the main section, and the lower end surface of the limiting section abuts against the concave stop.

[0014] A step with the step face downward is formed between the limiting section and the main section. The step and the concave stop are offset, and the limiting section is completely inserted into the concave stop. The outer end of the limiting section is flush with the upper end surface of the high-strength support bracket, thereby improving the integrity.

[0015] In the above-mentioned bimetallic nozzle core, an annular radial groove is provided on the inner side wall of the bottom end of the recessed stop, and the limiting section of the alloy nozzle core is located inside the annular radial groove.

[0016] An annular radial groove is provided between the side and bottom surfaces of the concave stopper. The annular radial groove is located between the inner side wall of the concave stopper and the outer side wall of the limiting section and can be used to release thermal expansion changes caused by temperature changes when the alloy nozzle core is used.

[0017] In the above-mentioned bimetallic nozzle core, a first guiding slope is provided on the inner circumference of the concave stop, and / or a second guiding slope is provided on the lower end of the alloy nozzle core.

[0018] The guide slope is used to provide a guiding function when the alloy mouth core and the high-strength support bracket are assembled and docked.

[0019] In the above-mentioned bimetallic tip, the lower end of the alloy tip is further provided with an arc-shaped diameter-reducing section, which is located below the main body section and has an outer diameter that gradually decreases downward.

[0020] The outer diameter of the arc-shaped reducing section gradually decreases, and the small-diameter end below it allows the nozzle core to flexibly enter and exit a smaller position to output the corresponding material at that position.

[0021] In the above-mentioned bimetallic nozzle core, a butt joint surface is provided at the lower end of the high-strength support bracket, and the butt joint surface is smoothly connected with the side wall of the arc-shaped reduced diameter section.

[0022] The butt joint surface and the arc-shaped reduced diameter section are smoothly connected to improve the integrity. On the other hand, it ensures that the high-strength support bracket effectively supports the entire main section, thereby improving the stability and precision of the material transfer channel.

[0023] In the above-mentioned bimetallic nozzle core, the feed channel comprises, from top to bottom, an upper section, a middle section and a lower section with decreasing inner diameters, and the upper section, the middle section and the lower section are connected via a smooth transition section.

[0024] The material transfer channel consists of an upper section, a middle section, and a lower section. The upper section is used to connect to the plastic supply pipe, the middle section is mainly used to transport plastic, and the lower section has a smaller diameter and is used to accurately output to the corresponding position.

[0025] In the above-mentioned bimetallic nozzle core, the upper section is provided with an internal thread for docking with the plastic supply pipe.

[0026] The internal thread provided on the upper section can realize detachable docking with the plastic supply pipe, making disassembly and assembly convenient.

[0027] As an optimization, an anti-rotation structure is provided between the alloy nozzle core and the assembly hole. The anti-rotation structure includes an axially extending reinforcing rib provided on the outer wall of the alloy nozzle core and an axially extending matching groove provided on the inner wall of the assembly hole. The length and width of the reinforcing rib and the matching groove are adapted to each other.

[0028] Reinforcing ribs are provided on the outer wall of the alloy nozzle core to improve the structural strength of the alloy nozzle core in the axial direction. Corresponding matching grooves are provided on the inner wall of the assembly hole to make way for the reinforcing ribs. At the same time, the cooperation between the reinforcing ribs and the matching grooves can also prevent the relative rotation of the alloy nozzle core and the high-strength support bracket, thereby improving the fixing stability of the two.

[0029] Compared with the prior art, the present invention has the following advantages:

[0030] 1. The alloy nozzle core of this bimetallic nozzle core is made of alloy material with good thermal conductivity, corrosion resistance and wear resistance, and is suitable for contact with plastic materials. A high-strength support sleeve made of high-strength material is provided on the alloy nozzle core. It has high structural strength and is used to provide support force to the alloy nozzle core from the outside to prevent the alloy nozzle core from being deformed by force, ensuring the stability and precision of the material feeding channel. It also allows the alloy nozzle core to be designed with a smaller thickness while ensuring the material feeding channel, thereby reducing manufacturing costs.

[0031] 2. The outer diameter of the main body section is slightly larger than the assembly hole. The assembly is carried out under the conditions of cold shrinkage of the alloy nozzle core and thermal expansion of the high-strength support bracket, so that the alloy nozzle core and the high-strength support bracket can be plugged in with an interference fit, which has a good fixing effect. At the same time, it ensures that the main body section and the inner wall of the assembly hole are in close contact, ensuring good support.

[0032] 3. An annular radial groove is provided between the side and bottom surfaces of the concave stopper. The annular radial groove is located between the inner side wall of the concave stopper and the outer side wall of the limiting section and can be used to release the thermal expansion changes caused by temperature changes when the alloy nozzle core is used.

[0033] 4. The butt joint surface and the arc-shaped reduced diameter section are smoothly connected to improve the integrity. On the other hand, it ensures that the high-strength support bracket effectively supports the entire main section, thereby improving the stability and precision of the material transfer channel. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 1 This is a schematic diagram of the overall structure provided by the utility model;

[0035] Figure 2 yes Figure 1 Schematic diagram of the cross section at AA in the middle;

[0036] Figure 3 This is a cross-sectional schematic diagram of the alloy nozzle core provided by the utility model;

[0037] Figure 4 It is a cross-sectional schematic diagram of the high-strength support bracket provided by the utility model.

[0038] In the figure, the alloy nozzle core 1, the material transfer channel 11, the main body section 12, the limiting section 13, the arc-shaped reduced diameter section 14, the second guide slope 15, the upper section 16, the middle section 17, the lower section 18, the high-strength support bracket 2, the assembly hole 21, the concave stop 22, the annular radial groove 23, the first guide slope 24, and the docking surface 25. DETAILED DESCRIPTION

[0039] The following are specific embodiments of the present invention and the accompanying drawings to further describe the technical solution of the present invention, but the present invention is not limited to these embodiments.

[0040] Specific implementation examples Figures 1-4 As shown, the bimetallic nozzle core comprises an alloy nozzle core 1 and a high-strength support bracket 2 sleeved on the alloy nozzle core 1. A material passing channel 11 is formed in the alloy nozzle core 1, and an assembly hole 21 is axially penetrated through the high-strength support bracket 2. The outer wall of the alloy nozzle core 1 and the inner wall of the assembly hole 21 are supported and fitted.

[0041] Specifically, the bimetallic nozzle core of the present invention is mainly composed of an alloy nozzle core 1 and a high-strength support bracket 2. The alloy nozzle core 1 is made of an alloy material with good thermal conductivity, corrosion resistance and wear resistance, and is suitable for contact with plastic materials. The high-strength support bracket 2 made of steel is sleeved on the alloy nozzle core 1 and has high structural strength. It is used to provide support force to the alloy nozzle core 1 from the outside, prevent the alloy nozzle core 1 from being deformed by force, ensure the stability and precision of the feed channel 11, and also enable the alloy nozzle core 1 to be designed with a smaller thickness while ensuring the feed channel 11, thereby reducing manufacturing costs.

[0042] like Figure 2 、 3 As shown, the alloy nozzle core 1 includes a main body section 12 and a limiting section 13. The outer diameter of the main body section 12 is slightly larger than the inner diameter of the assembly hole 21. The main body section 12 and the assembly hole 21 are fixed by interference fit. The outer wall of the main body section 12 is tightly attached to the inner wall of the assembly hole 21.

[0043] Specifically, the majority of the material transfer channel 11 is located within the main body section 12. The main body section 12 is cylindrical, with its outer wall in contact with the assembly hole 21, i.e., supported inwardly by the assembly hole 21, preventing deformation of the main body section 12. The limiting section 13 is integrally connected to the main body section 12 and is primarily used for limiting and docking with the high-strength support bracket 2, thereby completing the positioning and installation of the alloy tip core 1 and the high-strength support bracket 2. The outer diameter of the main body section 12 is slightly larger than the assembly hole 21. During assembly, the alloy tip core 1 is cooled with liquid nitrogen, while the high-strength support bracket 2 is heated to a high temperature. Assembly is performed while the alloy tip core 1 contracts and the high-strength support bracket 2 expands. This achieves an interference fit between the alloy tip core 1 and the high-strength support bracket 2, effectively securing the two. This also ensures close contact between the main body section 12 and the inner wall of the assembly hole 21, ensuring good support.

[0044] like Figure 2 、 4 As shown, a recessed stop 22 is provided at the upper end of the assembly hole 21. The inner diameter of the recessed stop 22 matches the outer diameter of the retaining section 13. The retaining section 13 has a larger outer diameter than the main section 12, and the lower end surface of the retaining section 13 abuts against the recessed stop 22. An annular radial groove 23 is provided on the inner sidewall of the bottom end of the recessed stop 22. The retaining section 13 of the alloy tip 1 is located inside the annular radial groove 23. A first guiding bevel 24 is provided on the inner circumference of the recessed stop 22, and a second guiding bevel 15 is provided at the lower end of the alloy tip 1.

[0045] Specifically, a downward-facing step is formed between the stopper section 13 and the main section 12. This step abuts against the recessed stop 22, allowing the stopper section 13 to be fully inserted into the recessed stop 22. The outer end of the stopper section 13 is flush with the upper end surface of the high-strength support plate 2, enhancing the integrity of the tip. An annular radial groove 23 is provided between the side and bottom surfaces of the recessed stop 22. This groove, located between the inner sidewall of the recessed stop 22 and the outer sidewall of the stopper section 13, is used to accommodate thermal expansion caused by temperature changes during use of the alloy tip 1. A guide ramp provides guidance during assembly and docking of the alloy tip 1 and the high-strength support plate 2.

[0046] As an optimization of this embodiment, the lower end of the alloy tip 1 is further provided with an arc-shaped reduced diameter section 14, located below the main body section 12, with its outer diameter gradually decreasing downward. The lower end of the high-strength support bracket 2 is provided with a docking surface 25, which smoothly connects with the sidewall of the arc-shaped reduced diameter section 14.

[0047] Specifically, the outer diameter of the arc-shaped tapered section 14 gradually decreases, and the smaller diameter end below it allows the nozzle to flexibly enter and exit a smaller position to discharge material accordingly. The smooth connection between the butt joint 25 and the arc-shaped tapered section 14 improves the integrity of the device. Furthermore, it ensures that the high-strength support bracket 2 effectively supports the entire main section 12, thereby improving the stability and precision of the material transfer channel 11.

[0048] In this embodiment, the feed channel 11 comprises, from top to bottom, an upper section 16, a middle section 17, and a lower section 18, each with decreasing inner diameter. The upper section 16, the middle section 17, and the lower section 18 are smoothly connected via a transition section. The upper section 16 is provided with an internal thread for connecting to the plastic supply pipe.

[0049] Specifically, the material transfer channel 11 consists of an upper section 16, a middle section 17, and a lower section 18. The upper section 16 is used to connect to the plastic supply pipe, the middle section 17 is mainly used to transport plastic, and the lower section 18 has a smaller diameter for accurately delivering plastic to the corresponding location. The internal thread of the upper section 16 allows for detachable docking with the plastic supply pipe, making it easy to disassemble and assemble.

[0050] As a further optimization of this embodiment, an anti-rotation structure (not specifically shown in the figure) is provided between the alloy tip core 1 and the assembly hole 21. The anti-rotation structure includes an axially extending reinforcing rib provided on the outer wall of the alloy tip core 1 and an axially extending matching groove provided on the inner wall of the assembly hole 21. The length and width of the reinforcing rib and the matching groove are adapted to each other.

[0051] Specifically, reinforcing ribs are provided on the outer wall of the alloy nozzle core 1 to improve the structural strength of the alloy nozzle core 1 in the axial direction. Corresponding matching grooves are provided on the inner wall of the assembly hole 21 to make way for the reinforcing ribs. At the same time, the cooperation between the reinforcing ribs and the matching grooves can also prevent the relative rotation of the alloy nozzle core 1 and the high-strength support bracket 2, thereby improving the fixing stability of the two.

[0052] The detailed working principle is as follows: During production, the blank of the alloy tip 1 is cooled in liquid nitrogen, while the blank of the high-strength support 2 is heated to 300°C. During assembly, the blank of the alloy tip 1 is inserted into the blank of the high-strength support 2 to form an interference fit. After assembly, the finished product is processed according to the final drawings. During use, molten plastic is fed into the upper section 16 of the feed channel 11, passes through the middle section 17, and is discharged from the lower section 18 to the corresponding position.

[0053] The specific embodiments described herein are merely illustrative of the spirit of the present invention. Persons skilled in the art may make various modifications, additions, or substitutions to the described specific embodiments without departing from the spirit of the present invention or exceeding the scope defined by the appended claims.

Claims

1. A bimetallic tip, characterized in that: The invention comprises an alloy nozzle core (1) and a high-strength support bracket (2) sleeved on the alloy nozzle core (1); a material passing channel (11) is formed in the alloy nozzle core (1); an assembly hole (21) is axially penetrated through the high-strength support bracket (2); and the outer wall of the alloy nozzle core (1) and the inner wall of the assembly hole (21) are supported and fitted.

2. The bimetallic tip according to claim 1, characterized in that: The alloy nozzle core (1) comprises a main body section (12) and a limiting section (13); the outer diameter of the main body section (12) is adapted to the inner diameter of the assembly hole (21); and the outer wall of the main body section (12) and the inner wall of the assembly hole (21) are in contact with each other.

3. The bimetallic tip according to claim 2, characterized in that: The outer diameter of the main body section (12) is slightly larger than the inner diameter of the assembly hole (21), and the main body section (12) and the assembly hole (21) are fixed by interference fit.

4. The bimetallic tip according to claim 2, characterized in that: The upper end of the assembly hole (21) is provided with a concave stop (22), the inner diameter of the concave stop (22) is adapted to the outer diameter of the limiting section (13), the outer diameter of the limiting section (13) is larger than the main section (12), and the lower end surface of the limiting section (13) abuts against the concave stop (22).

5. The bimetallic tip according to claim 4, characterized in that: An annular radial groove (23) is provided on the inner side wall of the bottom end of the concave stop (22), and the limiting section (13) of the alloy nozzle core (1) is located inside the annular radial groove (23).

6. The bimetallic tip according to claim 4, characterized in that: A first guiding slope (24) is provided on the inner circumference of the concave stop (22), and / or a second guiding slope (15) is provided on the lower end of the alloy nozzle core (1).

7. The bimetallic tip according to claim 2, characterized in that: The lower end of the alloy nozzle core (1) is further provided with an arc-shaped diameter-reducing section (14). The arc-shaped diameter-reducing section (14) is located below the main body section (12), and the outer diameter thereof gradually decreases downward.

8. The bimetallic tip according to claim 7, characterized in that: The lower end of the high-strength support bracket (2) is provided with a docking surface (25), and the docking surface (25) and the side wall of the arc-shaped reduced diameter section (14) are smoothly connected.

9. The bimetallic tip according to any one of claims 1 to 8, characterized in that: The feed channel (11) comprises an upper section (16), a middle section (17) and a lower section (18) with decreasing inner diameters from top to bottom, and the upper section (16), the middle section (17) and the lower section (18) are smoothly connected via a transition section.

10. The bimetallic tip according to claim 9, characterized in that: The upper section (16) is provided with an internal thread for docking with a plastic supply pipe.

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