A precision extrusion molding die device

Abstract

This utility model discloses a precision extrusion die device with a concentric radial uniform distribution structure, belonging to the technical field of polymer material processing equipment. The die device adopts a five-stage progressive structural design, including a concentric uniform distribution system, a dynamic pressure balancing channel, and a high-precision forming section. The concentric uniform distribution system ensures uniform material distribution; the dynamic pressure balancing channel reduces pressure loss and material accumulation through a double-spherical perfect arc preparation area and two diameter transitions; the high-precision forming section ensures high-precision forming through a shaping section with a length-to-diameter ratio >10:1 and forming holes with IT3-level precision. This utility model effectively solves the problems of uneven material distribution, dead zone material accumulation, and insufficient discharge accuracy existing in traditional dies, improving product quality and production efficiency while reducing energy consumption and mold maintenance costs.

Description

Technical Field

[0001] This disclosure relates to the field of polymer material processing equipment technology, and in particular to a precision extrusion molding die device. Background Technology

[0002] In the processing of polymer materials, the die is a key component that determines the quality of the extruded product. Currently, traditional dies have many problems:

[0003] Uneven material distribution: Traditional dies often adopt linear or symmetrical layouts, failing to consider the radial pressure gradient of melt flow, resulting in significant differences in flow rates between edge and center holes, with measured differences reaching 15-30%. Simultaneously, single-stage flow channel structures cannot effectively balance fluid pressure, and the outer ring holes, due to their long paths and high resistance, are prone to "starved flow" phenomena.

[0004] Dead zone material accumulation problem: Traditional transition areas use right angles or small arcs (R<1) design, forming flow dead zones, causing material retention, with residual amounts reaching 0.2-0.5g / cm³. Material accumulation areas are prone to material degradation, especially temperature-sensitive materials, and downtime for cleaning accounts for more than 20% of the production cycle.

[0005] Molding accuracy defects: Conventional length-to-diameter ratios (3-8:1) cannot fully eliminate the melt elastic memory effect, resulting in extrusion roundness errors >0.05mm. Hole machining mostly uses ordinary drilling processes (IT8 grade precision), with hole diameter deviations >±0.01mm.

[0006] Pressure control defects: The single-stage diameter change design causes a sudden pressure drop, measured at 5-8 MPa, requiring an additional back pressure compensation device. The lack of a pressure buffer zone makes the melt prone to sharkskin defects during high-speed extrusion (>5 m / min).

[0007] Energy consumption and lifespan issues: Pressure loss increases energy consumption per unit output by 20-40% (actual measured data). Material accumulation in the affected area causes corrosive degradation, shortening the lifespan of the mold surface to 3-6 months. Utility Model Content

[0008] This application provides a die device with an optimized flow channel structure, which achieves uniform material distribution, eliminates material accumulation, and ensures high-precision molding.

[0009] This application provides a precision extrusion molding die device, including:

[0010] The concentric circle distribution system is configured with several concentric rings according to the die size. Each ring has a uniformly distributed forming hole. The distance between the forming holes is consistent between the concentric ring layers. Each concentric ring has forming holes distributed at equal angles.

[0011] The dynamic pressure balance flow channel has a forming hole with a double spherical arc preparation section, a melt constraint section and a forming section. The spherical diameter of the preparation section is 1.5 times the distance between adjacent forming holes. The melt constraint section and the preparation section are transitioned by two diameter changes. The forming section has a shaping section with a length-to-diameter ratio > 10:1.

[0012] In the precision extrusion molding die apparatus provided according to at least one embodiment of the present disclosure, the diameter and number of forming holes of each concentric ring in the concentric circle distribution system are designed according to the actual application requirements of the die.

[0013] In the precision extrusion molding die apparatus provided according to at least one embodiment of the present disclosure, the molding hole has a machining accuracy of IT3 level and is treated with mirror polishing.

[0014] In the precision extrusion die apparatus provided according to at least one embodiment of the present disclosure, the surface of the forming orifice channel is made of a nickel-based ultra-wear-resistant alloy.

[0015] One or more technical solutions provided in the embodiments of this application have at least the following technical effects or advantages:

[0016] 1. The uniformity of material distribution is significantly improved, effectively solving the problem of flow difference between edge holes and center holes, and improving the consistency of product quality.

[0017] 2. The double-sphere perfect arc preparation area and the two-stage diameter transition design eliminate flow dead zones, reduce material retention and accumulation, lower the risk of material degradation, shorten downtime for cleaning, and improve production efficiency.

[0018] 3. A shaping section with a length-to-diameter ratio > 10:1 and high-precision processing technology can effectively eliminate the melt elastic memory effect, improve the roundness and straightness of the extruded material, and significantly improve the molding accuracy.

[0019] 4. The optimized flow channel structure reduces pressure loss, lowers energy consumption per unit output, and reduces corrosion of the mold surface by accumulated material, thus extending the mold's service life. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the precision extrusion molding die device in the embodiments of this application;

[0021] Figure 2 This is a cross-sectional view of the precision extrusion molding die device in an embodiment of this application;

[0022] Figure 3 for Figure 2 Enlarged schematic diagram of the structure at point A in the middle. Detailed Implementation

[0023] This application provides a precision extrusion die device for an extruder barrel, which optimizes the flow channel structure, achieves uniform material distribution, eliminates material accumulation, and ensures high-precision molding.

[0024] To better understand the above technical solutions, the following will provide a detailed explanation of the technical solutions in conjunction with the accompanying drawings and specific implementation methods.

[0025] like Figures 1 to 3 As shown in the embodiment of this application, the precision extrusion molding die device for an extruder barrel includes a concentric circle uniform distribution system 10 and a dynamic pressure balance flow channel. Several concentric rings are set according to the die size, and molding holes 11 are evenly distributed around each circumference. The distance between the molding holes is consistent between the concentric ring layers. Molding holes 11 are opened at equal angles on each concentric ring. The molding hole 11 is provided with a double spherical arc preparation section 20, a melt constraint section 30 and a molding section 40. The spherical diameter of the preparation section is 1.5 times the distance between adjacent molding holes. The melt constraint section and the preparation section are transitioned by two diameter changes. The molding section is provided with a shaping section with a length-to-diameter ratio > 10:1.

[0026] In this embodiment, the diameter change angle and diameter change size during the two diameter change transitions are optimized to achieve minimal pressure loss.

[0027] In the concentric circle distribution system, the diameter and number of forming holes of each concentric ring are designed according to the actual application requirements of the die.

[0028] In this embodiment, the forming hole is processed to IT3 level with mirror polishing (Ra≤0.05μm), which can effectively improve the extrusion quality of the material.

[0029] Furthermore, the surface of the formed hole flow channel is made of a nickel-based ultra-wear-resistant alloy.

[0030] Example 1

[0031] like Figure 1 and Figure 3 As shown, the precision extrusion molding die device of this application has a five-stage structure consisting of a concentric circle distribution system, a double spherical preparation area, two diameter-changing transition sections, and a large length-to-diameter ratio shaping section.

[0032] In practical production applications, the die-making device is adjusted according to the characteristics of the polymer materials to be processed, such as melt viscosity and flowability. First, the number and diameter of the concentric rings in the concentric circle distribution system, as well as the number and distribution angle of the forming holes, are determined. For example, for materials with good flowability, the number of forming holes can be appropriately increased to improve production efficiency; for materials with poor flowability, the flow channel structure needs to be optimized to ensure uniform material distribution.

[0033] During installation and commissioning, ensure the surfaces of the double-sphere perfect arc preparation area and the two diameter transition sections are smooth, free of impurities and defects. Regularly inspect and maintain the forming holes to ensure their machining accuracy consistently meets IT3 standards.

[0034] During the extrusion process, the equipment parameters are adjusted according to the extrusion speed and pressure requirements of the material to give full play to the role of the high-precision forming section, so that the roundness and straightness of the extruded product reach the expected perfect state.

[0035] Although preferred embodiments of this disclosure have been described, those skilled in the art, upon learning the basic inventive concept, can make other changes and modifications to these embodiments. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments as well as all changes and modifications falling within the scope of this disclosure.

[0036] Obviously, those skilled in the art can make various modifications and variations to this disclosure without departing from the present invention.

[0037] The spirit and scope of this disclosure. Thus, if these modifications and variations of this disclosure fall within the scope of the claims of this disclosure and their equivalents, this disclosure is also intended to include these modifications and variations.

Claims

1. A precision extrusion molding die device, characterized in that, include: The concentric circle distribution system is configured with several concentric rings according to the die size. Each ring has a uniformly distributed forming hole. The distance between the forming holes is consistent between the concentric ring layers. Each concentric ring has forming holes distributed at equal angles. The dynamic pressure balance flow channel has a forming hole with a double spherical arc preparation section, a melt constraint section and a forming section. The spherical diameter of the preparation section is 1.5 times the distance between adjacent forming holes. The melt constraint section and the preparation section are transitioned by two diameter changes. The forming section has a shaping section with a length-to-diameter ratio > 10:

1.

2. The precision extrusion molding die device as described in claim 1, characterized in that, In the concentric circle distribution system, the diameter and number of forming holes of each concentric ring are designed according to the actual application requirements of the die.

3. The precision extrusion molding die device as described in claim 1, characterized in that, The forming hole is machined to IT3 level with a precision and is mirror polished.

4. The precision extrusion molding die device as described in claim 1, characterized in that, The surface of the formed hole flow channel is made of nickel-based ultra-wear-resistant alloy.

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