Felt forming die

Abstract

The utility model discloses a felt forming die. The felt forming die comprises a lower die assembly and an upper die assembly. The lower mold assembly comprises a lower bottom plate, a lower mold and a lower mold elastic block, the upper mold assembly comprises an upper mold, an upper mold pressing plate and an upper mold insert, and the upper mold insert is preferentially in contact with the lower mold elastic block to form dynamic fit during mold closing, so that the edge of a felt sheet is kept in a non-compressed state in the initial stage to freely flow, and the deep cavity forming tensile stress is reduced; and the molding depth is controlled by the stroke of the upper mold insert, and the bottom bulge is embedded with the lower mold elastic block groove to realize synchronous molding of deep cavity and shallow cavity characteristics, so that the multi-process requirement is reduced. The compression spring and the limiting rod cooperate to regulate and control material extension, and the wrinkle defect is restrained.

Description

Technical Field

[0001] This utility model relates to the field of felt forming technology, and in particular to a felt forming mold. Background Technology

[0002] Felt forming technology, as a highly efficient three-dimensional fiber product processing technology, is widely used in automotive interiors, electronic device seals, and other fields. Traditional processes involve forming a felt sheet by pressing and fixing the edges with a hot-pressing mold. The basic process involves placing the felt sheet between the upper and lower molds, mechanically locking the edges of the sheet using rigid edge-pressing rings, then softening the material by heating and applying pressure to fill the cavity, ultimately forming the target structure. This method is effective for forming shallow cavities or uniformly stretched structures, but when faced with deep cavities or complex structures combining deep and shallow cavities, the process becomes increasingly challenging.

[0003] As product functionality demands upgrade, felt products often require the integration of cavity structures of varying depths within the same component (e.g., a deep cavity nested within a shallow cavity). During the molding of such composite structures, the material undergoes multiple stages of tensile deformation. Traditional rigid edge-pressing technology has significant drawbacks in this scenario. During the deep cavity molding stage, the complete constraint of the edge-pressing ring on the sheet edge results in excessive material flow resistance. Tensile stress concentration in the deep cavity sidewall area easily leads to fiber tearing and a sudden reduction in thickness. Furthermore, when molding a shallow cavity within a deep cavity, the material needs to undergo secondary stretching in the already plastically deformed area. At this point, the fibers in the original deep cavity sidewall area have changed, further exacerbating the risk of breakage during shallow cavity molding. Utility Model Content

[0004] In view of the deficiencies of the prior art, this utility model provides a felt forming mold:

[0005] This includes the lower mold assembly and the upper mold assembly that work together.

[0006] The lower mold assembly includes a lower base plate, a lower mold, and a lower mold spring block. The lower mold is fixedly installed on the upper surface of the lower base plate, and a first cavity is formed in its middle, penetrating the upper and lower end faces. The lower mold spring block is vertically slidably embedded in the first cavity, and a restoring spring is provided between its bottom and the lower base plate to form an elastic reset mechanism. When the lower mold spring block is subjected to external pressure, it moves downward along the first cavity and compresses the restoring spring. After the pressure is released, the elastic restoring force of the restoring spring drives the lower mold spring block to reset to its initial position.

[0007] The upper mold assembly includes an upper mold, an upper mold pressure plate, and an upper mold insert. The upper mold pressure plate is located below the upper mold, and a second cavity is formed in its middle that extends through the upper and lower end faces. The upper mold insert is embedded in the second cavity, and its top is rigidly connected to the upper mold, while its bottom extends through the second cavity and protrudes from the lower surface of the upper mold pressure plate.

[0008] Preferably, the lower mold spring block has a recessed groove at the top, and the upper mold insert has a raised structure at the bottom that matches the shape of the groove.

[0009] Preferably, the lower mold spring block has a recessed groove at the top, and the upper mold insert has a raised structure at the bottom that matches the shape of the groove.

[0010] Preferably, the upper mold assembly includes a limiting rod structure. The upper end of the limiting rod is rigidly fixed to the upper mold, and the lower extension section is provided with a limiting block with a diameter larger than the rod body. The upper mold plate has a gradient through hole that penetrates its upper and lower surfaces. The hole has a stepped variable diameter structure. The limiting rod passes through the gradient through hole to form a sliding fit, and the stroke of the upper mold plate is limited by the contact between the limiting block and the stepped surface inside the hole, so as to prevent the upper mold plate from separating from the upper mold.

[0011] Preferably, it also includes a guide rod, the lower end of which is fixed to the lower mold assembly, and the upper end of which passes through the upper mold assembly and is slidably connected to the upper mold assembly; the guide rod prevents misalignment during mold closing.

[0012] The felt forming mold provided by this utility model achieves efficient and high-precision forming of complex felt products through its structural design. The mold employs a dynamic cooperation mechanism between the lower mold spring block and the upper mold insert. In the initial stage of mold closing, the spring block preferentially contacts and compresses, keeping the edges of the felt sheet in a non-compressed state, allowing free material flow. This significantly reduces tensile stress concentration during the deep cavity forming stage, effectively preventing fiber tearing and wall thickness reduction. As the upper mold assembly continues to press down, the stroke of the upper mold insert into the first cavity precisely controls the stretching depth. Through the interlocking structure of grooves and protrusions, the deep cavity body and shallow cavity features are simultaneously formed, reducing the need for traditional multi-process machining and improving processing efficiency. The compression spring and limit rod configured in the upper mold assembly work together to balance the material's elongation by adjusting the spring stiffness and stroke, significantly improving the uniformity of felt filling and suppressing surface wrinkles. Attached Figure Description

[0013] The above and / or additional aspects and advantages of this invention will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which:

[0014] Figure 1 This is a three-dimensional view of the felt forming mold structure provided by this utility model;

[0015] Figure 2 This is a structural diagram of the lower mold assembly of the felt forming mold provided by this utility model;

[0016] Figure 3 This is an exploded view of the lower mold assembly of the felt forming mold provided by this utility model;

[0017] Figure 4This is a structural diagram of the upper mold assembly of the felt forming mold provided by this utility model;

[0018] Figure 5 This is an exploded view of the upper mold assembly of the felt forming mold provided by this utility model. Detailed Implementation

[0019] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this utility model, and should not be construed as limiting this utility model.

[0020] In the description of this utility model, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," and "counterclockwise," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing this utility model and simplifying the description. They do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include one or more of the stated features. In the description of this utility model, "a plurality of" means two or more, unless otherwise explicitly specified.

[0021] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection, an electrical connection, or a connection that allows for communication; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0022] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0023] The following disclosure provides many different embodiments or examples for implementing various structures of this invention. To simplify the disclosure, specific examples of components and arrangements are described below. These are merely examples and are not intended to limit the scope of the invention. Furthermore, reference numerals and / or letters may be repeated in different examples; such repetition is for simplification and clarity and does not in itself indicate a relationship between the various embodiments and / or arrangements discussed. In addition, examples of various specific processes and materials are provided in this invention, but those skilled in the art will recognize the application of other processes and / or the use of other materials.

[0024] like Figure 1-5 As shown, the present invention provides a felt forming mold, which includes a lower mold assembly 1 and an upper mold assembly 2 that cooperate with each other.

[0025] The lower mold assembly includes a lower base plate 11, a lower mold 12, and a lower mold spring block 13. The lower mold 12 is fixedly installed on the upper surface of the lower base plate 11, and a first cavity 121 is formed in its middle, penetrating the upper and lower end faces. The lower mold spring block 13 is vertically slidably embedded in the first cavity 121, and a restoring spring 14 is provided between its bottom and the lower base plate 11, forming an elastic reset mechanism. When the lower mold spring block 13 is subjected to external pressure, it moves downward along the first cavity 121 and compresses the restoring spring 14. After the pressure is released, the elastic restoring force of the restoring spring 14 drives the lower mold spring block 13 to reset to its initial position.

[0026] The upper mold assembly 2 includes an upper mold 21, an upper mold pressure plate 22, and an upper mold insert 23. The upper mold pressure plate 22 is disposed below the upper mold 21, and has a second cavity 221 extending through the upper and lower end faces in its middle. The upper mold insert 23 is embedded in the second cavity 22, and its top is rigidly connected to the upper mold 21, while its bottom extends through the second cavity 221 and protrudes from the lower surface of the upper mold pressure plate 22. When the mold is closed, the bottom of the upper mold insert 23 forms a dynamic engagement with the lower mold spring block 13 to apply local forming pressure to the felt sheet.

[0027] This embodiment provides a felt forming mold in which the process is controlled by a hot pressing device that simultaneously provides pressure and temperature. During processing, the felt sheet is placed on the upper surface of the lower mold assembly 1, and the hot pressing device drives the upper mold assembly 2 to move downward and gradually close with the lower mold assembly 1. In the initial stage, the protruding structure at the bottom of the upper mold insert 23 preferentially contacts the lower mold spring block 13, forcing the lower mold spring block 13 to move downward along the first cavity 121 and compress the recovery spring. At this time, the upper mold pressure plate 22 has not yet contacted the lower mold 12, and the edge of the felt sheet is in a non-compressed state. The felt material can flow freely from the periphery to the center, greatly reducing the tensile stress concentration in the deep cavity forming stage and avoiding fiber tearing or excessive thinning. As the upper mold assembly 2 continues to press down, the stroke distance of the upper mold insert 23 embedded in the first cavity 121 directly corresponds to the stretching depth of the felt material, and its outer contour defines the shape of the deep cavity. When the deep cavity reaches the preset depth, the upper mold platen 22 contacts the surface of the lower mold 12 and applies a rigid clamping force to the edge of the sheet to prevent the material from slipping. Then the hot pressing equipment starts the heating program to soften and shape the felt.

[0028] In some embodiments, such as Figure 2 , Figure 5 As shown, the lower mold spring block 13 has a recessed groove 131 at its top, while the upper mold insert 23 has a protrusion 231 at its bottom that matches the shape of the groove 131. Through the precise engagement of the groove 131 and the protrusion 231 when the upper and lower molds are closed, a shallow cavity feature can be simultaneously formed inside the deep cavity by using the protrusion 231 to simultaneously press and imprint a localized area while the felt material is being pressed into a deep cavity main structure. This composite cavity structure achieves integrated molding of deep and shallow cavities, reducing subsequent processing steps and making it suitable for the production of felt products with multi-level steps or complex internal cavity contours.

[0029] In some embodiments, such as Figure 5 As shown, the upper mold assembly 2 includes a compression spring 24, which is disposed between the upper mold 21 and the upper mold pressure plate 22.

[0030] In this embodiment, by setting the compression spring 24, the upper mold pressure plate 22 can squeeze the felt material before the upper mold insert 23 is fitted into the first cavity 121. By matching the stiffness coefficient and stroke of the spring, the pressure gradient of the felt can be precisely controlled, which can effectively suppress the excessive stretching of the felt material in the flow filling stage, thereby avoiding surface wrinkle defects caused by excessive fluidity.

[0031] In some embodiments, the upper mold assembly 2 includes a limiting rod structure. The upper end of the limiting rod is rigidly fixed to the upper mold 21, and the lower extension section is provided with a limiting block with a diameter larger than the rod body. The upper mold pressure plate 22 is machined with a gradient through hole 222 penetrating its upper and lower surfaces. The hole has a stepped variable diameter structure. The limiting rod passes through the gradient through hole to form a sliding fit, and the stroke of the upper mold pressure plate 22 is limited by the abutment of the limiting block with the stepped surface inside the hole, so as to prevent the upper mold pressure plate 22 from separating from the upper mold 21.

[0032] In some embodiments, such as Figure 3 As shown, the felt forming mold provided by this utility model also includes a guide rod 3. The lower end of the guide rod 3 is fixed to the lower mold assembly 1, and the upper end passes through the upper mold assembly 2 and is slidably connected to the upper mold assembly 2; the guide rod 3 prevents misalignment when the mold is closed.

[0033] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of this utility model. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0034] Although embodiments of the present invention have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the claims and their equivalents.

Claims

1. A felt forming mold, characterized in that, This includes the lower mold assembly and the upper mold assembly that work together. The lower mold assembly includes a lower base plate, a lower mold, and a lower mold spring block. The lower mold is fixedly installed on the upper surface of the lower base plate, and a first cavity is formed in the middle of the lower mold, which passes through the upper and lower end faces. The lower mold spring block is vertically slidably embedded in the first cavity, and a restoring spring is provided between its bottom and the lower base plate to form an elastic reset mechanism. When the lower mold spring block is subjected to external pressure, it moves downward along the first cavity and compresses the restoring spring. After the pressure is released, the elastic restoring force of the restoring spring drives the lower mold spring block to reset to its initial position. The upper mold assembly includes an upper mold, an upper mold pressure plate, and an upper mold insert. The upper mold pressure plate is located below the upper mold, and a second cavity is formed in its middle that extends through the upper and lower end faces. The upper mold insert is embedded in the second cavity, and its top is rigidly connected to the upper mold, while its bottom extends through the second cavity and protrudes from the lower surface of the upper mold pressure plate.

2. The felt forming mold according to claim 1, characterized in that, The lower mold spring block has a recessed groove at the top, and the upper mold insert has a raised structure at the bottom that matches the shape of the groove.

3. The felt forming mold according to claim 2, characterized in that, The upper mold assembly includes a compression spring, which is located between the upper mold and the upper mold pressure plate.

4. The felt forming mold according to claim 3, characterized in that, The upper mold assembly includes a limiting rod structure. The upper end of the limiting rod is rigidly fixed to the upper mold, and the lower extension section is provided with a limiting block with a diameter larger than the rod body. The upper mold pressure plate is machined with a gradient through hole that runs through its upper and lower surfaces. The hole is a stepped variable diameter structure. The limiting rod passes through the gradient through hole to form a sliding fit, and the stroke of the upper mold pressure plate is limited by the contact between the limiting block and the stepped surface inside the hole, so as to prevent the upper mold pressure plate from separating from the upper mold.

5. A felt forming mold according to claim 1, characterized in that, It also includes a guide rod, the lower end of which is fixed to the lower mold assembly, and the upper end of which passes through the upper mold assembly and is slidably connected to the upper mold assembly; the guide rod prevents misalignment during mold closing.

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