Compression molding die for supercritical foaming small blank

Abstract

The utility model relates to a compression molding die for supercritical foaming small blanks, which comprises an upper cover and a bottom die, at least one die cavity is arranged on the surface of the bottom die, and the compression molding die is characterized by further comprising a shoe die placed in the die cavity, a breathable steel component is embedded in the shoe die and provided with a plurality of breathable holes, and the breathable steel component is provided with a plurality of vent holes. The breathable steel part corresponds to the side and the bottom of the outline of the shoe sole, and a channel used for vacuumizing the breathable steel part is arranged between the upper cover and the bottom die. A breathable steel part manufactured through 3D printing is embedded in a bottom die of the die, the shape of the part is matched with the outline of a shoe sole, and a 3D printing side and a 3D printing bottom are formed; by means of the porous characteristic of the 3D printing breathable steel, uniform exhaust of the area around the shoe sole is achieved, and compared with a traditional mold with a single exhaust hole, the exhaust range is wider and more uniform.

Description

Technical Field

[0001] This utility model relates to the field of shoe mold technology, specifically to a mold for supercritical foaming miniature molding. Background Technology

[0002] In the footwear industry, supercritical foam materials are widely used in the fabrication of shoe soles and other components due to their advantages such as lightweight and good elasticity. However, supercritical foam preforms face the following technical challenges:

[0003] 1. Surface characteristics: The blank has a bright surface (with a skin) and low material hardness;

[0004] 2. Expansion ratio: The expansion ratio reaches 2.2-2.5 times, which is much higher than the 1.65-1.8 times of ordinary foam materials;

[0005] 3. Molding defects: Because the surface of the blank is relatively "polished" (smooth and difficult to adhere to), the roughing process is extremely inefficient and it is difficult to roughen the blank completely. As a result, during subsequent hydraulic molding, the small patterns, sharp corners and other details of the sole are difficult to be fully filled by the material, and clear and full patterns cannot be pressed out, which seriously affects product quality and production efficiency.

[0006] Existing conventional hydraulic molds form by "opening vent holes and using the material to squeeze into fine patterns when the sole is under pressure." However, for supercritical foamed preforms, this method has poor venting and forming effects and cannot meet the full forming requirements of fine patterns and sharp corners. Summary of the Invention

[0007] This invention provides a mold for supercritical foaming preform molding to solve the above-mentioned problems of existing molds.

[0008] The present invention adopts the following technical solution:

[0009] A compression molding die for supercritical foamed preforms includes a top cover and a bottom mold. The bottom mold has at least one cavity on its surface. The die also includes a shoe mold placed inside the cavity. A breathable steel component is embedded in the shoe mold. The breathable steel component has multiple vent holes. The breathable steel component corresponds to the side and bottom of the shoe sole contour. A channel for evacuating the breathable steel component is provided between the top cover and the bottom mold.

[0010] Furthermore, the diameter of the aforementioned vent holes is 0.1-2.0 mm.

[0011] Furthermore, the bottom mold surface is provided with two mold cavities, which are symmetrically distributed on the left and right sides. The channel is T-shaped and connects the two mold cavities simultaneously.

[0012] Furthermore, the shoe mold has multiple raised edges with through holes, and the bottom mold has an internal threaded groove aligned with the through holes. The shoe mold can be detachably connected to the bottom mold by bolts engaging with the internal threaded groove.

[0013] Furthermore, the rear end of the aforementioned upper cover is movably connected to the aforementioned bottom mold via a pin.

[0014] As can be seen from the above description of the structure of this utility model, compared with the prior art, this utility model has the following advantages:

[0015] 1. The mold bottom of this application embeds a breathable steel component made by 3D printing. The shape of the component is adapted to the outline of the shoe sole, forming a "3D printed side" and a "3D printed bottom". By utilizing the porous characteristics of 3D printed breathable steel, uniform air venting is achieved in the area around the shoe sole. Compared with the single air vent of traditional molds, the air venting range is wider and more uniform.

[0016] 2. The bottom mold of this application is machined with a vacuum channel, and a "pre-set vacuum port in the middle" is provided on the upper surface of the bottom mold. One end of the vacuum channel is connected to the pre-set vacuum port in the middle, and the other end is connected to an external vacuum extraction device.

[0017] 3. In the use of the mold in this application, a supercritical foamed preform is placed between the bottom mold and the top mold cover for hydraulic heating and molding. When heated to the required "half-heated" state, the material softens due to heat and its fluidity significantly increases. An external vacuum extraction device is then activated to extract gas from the mold through the vacuum channel and the pre-set vacuum port in the middle. Using the external force generated by the vacuum, material at the sharp corners and fine patterns of the sole is "drawn" into the corresponding structures. Simultaneously, 3D-printed breathable steel components assist in expelling surrounding gas. The combination of these two methods significantly improves the venting effect, allowing the material to fully fill the sharp corners, fine patterns, and other detailed areas, ultimately forming a full and clear sole pattern structure. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the bottom mold of this utility model.

[0019] Figure 2 This is a schematic diagram of the mold of this utility model. Detailed Implementation

[0020] The specific embodiments of this utility model are described below with reference to the accompanying drawings.

[0021] Reference Figure 1 , Figure 2A compression molding die for supercritical foamed preforms includes an upper cover 1 and a bottom mold 2. The bottom mold 2 has at least one mold cavity 20 on its surface. The die also includes a shoe mold 3 placed in the mold cavity 20. A breathable steel component 30 is embedded in the shoe mold 3. The breathable steel component 30 has multiple air holes 301. The breathable steel component 30 corresponds to the side and bottom of the shoe sole contour. A channel 10 for evacuating the breathable steel component 30 is provided between the upper cover 1 and the bottom mold 2. The outer end of the channel 10 is connected to a vacuum pumping device.

[0022] Reference Figure 1 The bottom mold 2 has two mold cavities 20 on its surface, which are symmetrically distributed on the left and right sides. The channel 10 is T-shaped and connects the two mold cavities 20 simultaneously.

[0023] The shoe mold 3 has multiple protrusions 31 along its edge, and each protrusion 31 has a through hole 32. The bottom mold 2 has an internal threaded groove aligned with the through hole 32. The shoe mold 3 can be detachably connected to the bottom mold 2 by bolts engaging with the internal threaded groove.

[0024] The rear end of the upper cover 1 is movably connected to the bottom mold 2 via a pin 21.

[0025] The above are merely specific embodiments of this utility model, but the design concept of this utility model is not limited thereto. Any non-substantial modifications made to this utility model using this concept shall be considered as an infringement of the protection scope of this utility model.

Claims

1. A compression molding die for supercritical foamed preforms, comprising an upper cover and a bottom mold, wherein the surface of the bottom mold has at least one cavity, characterized in that: It also includes a shoe mold placed in a mold cavity, in which a breathable steel component is embedded. The breathable steel component has multiple ventilation holes and corresponds to the side and bottom of the shoe sole contour. A channel for evacuating the breathable steel component is provided between the top cover and the bottom mold.

2. The compression molding die for a supercritical foamed preform as described in claim 1, characterized in that: The diameter of the vent hole is 0.1-2.0 mm.

3. The compression molding die for a supercritical foamed preform as described in claim 1, characterized in that: The bottom mold surface has two mold cavities, which are symmetrically distributed on the left and right sides. The channel is T-shaped and connects the two mold cavities simultaneously.

4. The compression molding die for a supercritical foamed preform as described in claim 1, characterized in that: The shoe mold has multiple raised edges with through holes, and the bottom mold has an internal threaded groove aligned with the through holes. The shoe mold can be detachably connected to the bottom mold by bolts engaging with the internal threaded groove.

5. The compression molding die for a supercritical foamed preform as described in claim 1, characterized in that: The rear end of the upper cover is movably connected to the bottom mold via a pin.

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