Microporous mold for 3D printing secondary EVA mold
By setting 3D-printed microporous channels on the inner wall of the shoe sole mold, the problem of air venting at the sharp corners, edges, and pattern transition points of the mold is solved, improving the quality and breathability of the finished shoe sole and avoiding rough edges and defects.
Patent Information
- Application Number
- CN202423259983.9
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-28
- Publication Date
- 2026-01-02
- Estimated Expiration
- 2034-12-28
AI Technical Summary
Existing shoe sole molds have difficulty effectively removing air at sharp corners, edges, and pattern transition points, leading to air bubbles, dents, or other defects. Furthermore, conventional processing methods affect pattern quality or increase burrs.
3D printing technology is used to create microporous channels on the inner wall of the mold, including coarse-hole sections, flared sections, and fine-hole sections. The microporous channels are opened at sharp corners, edges, and pattern turning points. The pore size is controlled by 3D printing technology to improve venting efficiency and product quality.
It effectively solved the problems of air bubbles and depressions, improved product quality, avoided burrs and raised edges, and improved mold permeability and finished product quality by optimizing airflow rate and temperature to reduce exhaust efficiency.
Smart Images
Figure CN223750041U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to the mould field, more specifically, it relates to a 3D printing secondary EVA mould micro -hole mould. BACKGROUND
[0002] The design of the sole mould is an extremely important link in the shoe mould production process. In the process of mould closing and material injection, the air in the mould needs to be effectively excluded, otherwise the product will have air bubbles, depressions or other defects, especially in the corresponding sharp corner position, the edge line, the pattern turning point and some other positions where air is easy to be trapped, which is more likely to have the effect that air cannot be effectively excluded.
[0003] And the existing processing mode for the pattern of the sole side wall can only reduce the depth and density of the corresponding pattern of the mould, or increase the air hole diameter to improve the air exhaust amount, but such processing still has the situation that air bubbles, depressions or other defects occur, and even if the above defects do not occur, the depth and density of the corresponding pattern are reduced, which leads to the decline of the overall appearance and quality of the pattern, and increasing the air hole diameter will cause more product burrs, resulting in poor product quality.
[0004] Therefore, a new scheme needs to be proposed to solve this problem. CONTENT OF THE UTILITY MODEL
[0005] In view of the defects in the prior art, the utility model aims at solving the above problems and provides a 3D printing secondary EVA mould micro -hole mould.
[0006] The utility model discloses a 3D printing secondary EVA mould micro -hole mould through the following technical scheme and achieves the above-mentioned purpose.
[0007] The utility model further sets up that micro -hole channel is set as three parts of coarse hole section, flared section and fine hole section respectively, coarse hole section, flared section and fine hole section are communicated in proper order, and the fine hole section port is located at one end of the micro -hole channel communication mould cavity.
[0008] The utility model further sets up that the coarse hole section port extends to the mould core outside wall, and the lower mould core outside wall is provided with the air guide channel that communicates the coarse hole section port of each micro -hole channel.
[0009] The utility model further sets up that the fine hole section port aperture is 0.02mm.
[0010] Compared with the prior art, the utility model has the advantages that:
[0011] The 3D printing technology can solve the problem that the conventional processing methods such as drilling, electric spark processing and laser drilling cannot start a gas hole at a sharp corner position, an edge line and a pattern turning point, thereby effectively solving the problems of bubbles, depressions and other defects, and relatively increasing the gas hole diameter in the conventional processing method. BRIEF DESCRIPTION OF DRAWINGS
[0012] Fig. 1 It is a structural schematic view of the utility model;
[0013] Fig. 2 It is a structural schematic view of the micro-hole channel.
[0014] The figure mark: 1, the lower mould core; 2, the line relief; 3, the micro-hole channel; 4, the rough hole section; 5, the flared section; 6, the fine hole section; 7, the gas guide channel. DETAILED DESCRIPTION
[0015] The technical scheme in the embodiments of the utility model will be described clearly and completely in combination with the drawings in the embodiments of the utility model, and in the description of the utility model, it is understood that the orientation or position relationship indicated by the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer" and the like is based on the orientation or position relationship shown in the drawings, and is only for the convenience of describing the utility model and simplifying the description, and is not indicative or suggestive of the device or element indicated must have a particular orientation, a particular orientation and operation, therefore, it cannot be understood as the limitation of the utility model, obviously, the described embodiments are only a part of the embodiments of the utility model, not all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by the person skilled in the art without creative labor are within the protection scope of the utility model.
[0016] Embodiment:
[0017] A 3D printing secondary EVA mould micro-hole mould, such as Figs. 1-2As shown, including the lower mold core 1, the inner wall of the lower mold core 1 is provided with a texture convex 2, and the texture convex 2 forms the corresponding pattern of the sidewall of the sole. The lower mold core 1 is provided with a plurality of micro-porous channels 3 for exhaust by 3D printing technology. The micro-porous channels 3 are provided at the sharp corner position, the edge line and the pattern transition point of the texture convex 2. Thus, the 3D printing technology can solve the problem that the conventional processing methods such as drilling, electric spark machining and laser drilling cannot form air holes at the sharp corner position, the edge line and the pattern transition point. Thus, the problem of air bubbles, depressions or other defects is effectively solved. Compared with the conventional processing method of increasing the diameter of the air hole, the technology of the present application can effectively control the diameter of the micro-porous channel 3, thereby effectively avoiding the problem of burr protrusion, and further improving the product quality.
[0018] Meanwhile, the micro-porous channel 3 is provided with a coarse hole section 4, an expanded hole section 5 and a fine hole section 6. The coarse hole section 4, the expanded hole section 5 and the fine hole section 6 are sequentially communicated. The port of the fine hole section 6 is located at one end of the micro-porous channel 3 communicated with the mold cavity. Thus, during the exhaust process, the gas flow passes from the area with small hole diameter to the area with large hole diameter. According to the continuity equation (mass conservation), the flow rate is inversely proportional to the cross-sectional area of the pipeline when the fluid is incompressible. Therefore, when the gas flow passes from the smaller hole diameter to the larger hole diameter, the flow rate will decrease. Thus, when the gas flow transitions from the expanded hole section 5 to the coarse hole section 4, the flow rate decreases, avoiding the situation that the material penetrates too deeply into the micro-nano air hole when the molten material is injected into the micro-nano air mold at the initial stage due to the flow rate process. According to Bernoulli's equation, when the flow rate decreases, the static pressure of the gas flow will decrease. This is because part of the kinetic energy of the gas flow is converted into static pressure energy. The conversion between the kinetic energy and the static pressure energy of the gas flow will reduce the temperature of the gas flow, thereby forming a better air permeability and cooling effect.
[0019] The port of the coarse hole section 4 extends to the outer sidewall of the mold core. The outer sidewall of the lower mold core 1 is provided with a gas guide channel 7 communicated with the ports of the coarse hole sections 4 of the micro-porous channels 3. The gas guide channel 7 is used to uniformly guide the exhaust gas, thereby improving the exhaust efficiency and reducing the cost of opening the lower mold.
[0020] The port diameter of the fine hole section 6 is 0.02mm. The 3D printing technology can produce a hole diameter that cannot be produced by the existing conventional mold air hole processing equipment. Thus, the burr protrusion caused by the hole diameter can be effectively avoided, thereby improving the product quality. Moreover, the 3D printing technology can better generate the structure of the expanded hole section 5, thereby reducing the processing difficulty.
[0021] It is apparent for a person skilled in the art that the present application is not limited to the details of the above-described exemplary embodiments, but that it can be implemented in other concrete forms without departing from the spirit or the essential characteristics of the present application. Therefore, the embodiments should be considered as exemplary and non-limiting, the scope of the present application being defined by the claims appended hereto rather than by the above description, and all the changes which fall within the meaning and the scope of the equivalent elements of the claims are intended to be embraced therein. Any reference signs in the claims should not be construed as limiting the claims to the figures in which the reference signs are used.
[0022] Furthermore, it should be understood that although the present specification describes exemplary embodiments, not every embodiment contains only one independent technical solution, and the present specification is described in this way only for the sake of clarity, and a person skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that a person skilled in the art can understand.
Claims
1. A 3D printed secondary EVA mold microcellular mold characterized by: The lower mold core (1) is provided with a raised pattern (2) on the inner wall, and a plurality of micro-hole channels (3) for exhaust are opened in the lower mold core (1) by 3D printing technology, and the micro-hole channels (3) are opened at the sharp corner positions, edge lines and pattern turning points of the raised pattern (2).
2. The 3D printed secondary EVA mold microporous mold of claim 1, wherein: The micro-hole channels (3) are respectively provided with three parts of a coarse hole section (4), an expanded hole section (5) and a fine hole section (6), the coarse hole section (4), the expanded hole section (5) and the fine hole section (6) are sequentially communicated, and the port of the fine hole section (6) is located at one end of the micro-hole channel (3) communicating with the mold cavity.
3. The 3D printed secondary EVA mold microporous mold of claim 2, wherein: The port of the coarse hole section (4) extends to the outer wall of the mold core, and the outer wall of the lower mold core (1) is provided with a gas guide channel (7) communicating with the ports of the coarse hole sections (4) of the micro-hole channels (3).
4. The 3D printed secondary EVA mold microporous mold of claim 2, wherein: The aperture of the port of the fine hole section (6) is 0.02 mm.