Compression molding die

Abstract

The utility model discloses a compression molding die, which comprises an upper die and a lower die matched with the upper die, the upper die is provided with a fixed template, the lower working surface of the fixed template is connected with a punch, the punch is provided with a mounting groove, an ejection mechanism is arranged in the mounting groove, and the ejection mechanism is connected with the fixed template. A positioning demolding mechanism is arranged at the cavity bottom, protruding out of the lower mold cavity, of the lower mold, the arrangement position of the positioning demolding mechanism corresponds to the arrangement position of the ejection mechanism, and a pre-compression charging barrel is arranged on the upper working face of the lower mold. The problem that the product is adsorbed on an upper die punch and is difficult to take down during die opening is solved; and meanwhile, the product can be easily separated from the cavity, the first positioning demolding block is provided with a demolding oblique angle, and rapid demolding can be achieved by separating the product from the first positioning demolding block.

Description

Technical Field

[0001] The utility model relates to the technical field of molds, in particular to a compression molding mold. Background Art

[0002] Compression molding (also known as press molding or compression molding) is a process of placing powdered, granular or fibrous materials into the molding cavity of a mold, closing the mold and applying pressure to form and solidify the materials under heating or room temperature. Compression molding can be applied to thermosetting and thermoplastic materials. Its main advantages are: the product structure and appearance can be molded in one step, which can effectively reduce the processing steps, shorten the processing time, and reduce the product cost.

[0003] However, when using the traditional compression molding process to prepare the fan base, the thermosetting or thermoplastic composite material is transferred to the cavity of the molding mold and compression molded under heating or cooling conditions. There are two main disadvantages:

[0004] 1) During the molding process, the material is squeezed by pressure, so that the material penetrates into the gap of the embedded insert to form burrs, and is connected to the product as a whole, resulting in the problem that the product is adsorbed on the upper mold punch and is difficult to remove when the mold is opened;

[0005] 2) In order to optimize product costs, when thin embedded inserts are used, they are easily squeezed and deformed by the molding pressure, resulting in the embedded inserts firmly biting the positioning columns and unable to be demolded. Utility Model Content

[0006] The utility model aims at the deficiencies in the prior art and provides a compression molding die which can be quickly demoulded and has high process stability.

[0007] In order to solve the above technical problems, the utility model solves the problems through the following technical solutions: a compression molding mold, comprising an upper mold and a lower mold matching the upper mold, the upper mold is provided with a fixed template, the lower working surface of the fixed template is connected to a punch, the punch is provided with a mounting groove, an ejection mechanism is arranged in the mounting groove, a positioning and demolding mechanism is arranged at the bottom of the cavity of the lower mold protruding from the cavity of the lower mold, the setting position of the positioning and demolding mechanism corresponds to the setting position of the ejection mechanism, and a pre-compression barrel is arranged on the upper working surface of the lower mold.

[0008] In the above technical solution, the ejection mechanism includes a fixed column arranged on the lower working surface of the fixed template and a compression spring whose fixed end is connected through the fixed column.

[0009] In the above technical solution, the positioning and demolding mechanism includes a first positioning and demolding module and a second positioning and demolding module. The first positioning and demolding module is connected to the lower mold, and the second positioning and demolding module is movably connected to the first positioning and demolding module and protrudes from the bottom of the cavity of the lower mold. When the mold is closed, the movable end of the compression spring is against the second positioning and demolding module.

[0010] In the above technical solution, the punch is fixedly connected to the upper die via a screw.

[0011] In the above technical solution, guide columns are arranged around the fixed template.

[0012] In the above technical solution, guide sleeves corresponding to the positions of the guide posts are arranged around the pre-compression barrel.

[0013] In the above technical solution, a hollow structure consistent with the size of the cavity is provided in the pre-compression barrel.

[0014] Compared with the prior art, the utility model has the following beneficial effects: a fixed template is provided on the upper mold, a punch is fixed under the fixed template, a mounting groove is provided on the punch, an ejection mechanism is provided in the mounting groove, and the ejection mechanism includes a fixed column provided on the fixed template and a compression spring connected at the fixed end through the fixed column. When the upper mold and the lower mold are closed, the spring is in a compressed state and abuts against the first positioning and demolding module; when the upper mold and the lower mold are opened, the spring releases the rebound force and makes the first positioning and demolding module and the product stay in the cavity of the lower mold, which solves the problem that the product is adsorbed on the upper mold punch and is difficult to remove when the mold is opened. At the same time, after the mold is opened, the product and the first positioning and demolding module remain in the cavity of the lower mold, and the first positioning and demolding module and the second positioning and demolding module are movably connected, so that the product can be easily separated from the cavity. Finally, a demolding bevel is provided on the first positioning and demolding module, which can separate the product from the first positioning and demolding module to achieve rapid demolding. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0016] Figure 1 It is a schematic diagram of the structure of the utility model.

[0017] Figure 2 It is a schematic diagram of the explosion structure of the utility model.

[0018] Figure 3 It is a schematic diagram of the cross-sectional structure of the utility model. DETAILED DESCRIPTION

[0019] The utility model is described in further detail below in conjunction with the accompanying drawings.

[0020] The following description is used to disclose the utility model so that those skilled in the art can implement the utility model. The preferred embodiments described below are only examples, and those skilled in the art can think of other obvious variations. The basic principles of the utility model defined in the following description can be used for other implementation schemes, variations, improvements, equivalent schemes, and other technical solutions that do not deviate from the spirit and scope of the utility model.

[0021] Those skilled in the art should understand that, in the disclosure of the present invention, the directions or positions indicated by the terms "longitudinal", "lateral", "up", "down", "left", "right", "front", "back", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc. are based on the directions or positional relationships shown in the accompanying drawings, which are only simplified descriptions for the convenience of describing the present invention, and do not indicate or imply that the device or component referred to must have a specific direction, be constructed and operated in a specific direction. Therefore, the above terms should not be understood as limitations on the present invention.

[0022] It is to be understood that the term "one" should be understood as "at least one" or "one or more", that is, in one embodiment, the number of an element may be one, while in another embodiment, the number of the element may be multiple, and the term "one" should not be understood as a limitation on the quantity.

[0023] See also Figures 1 to 3 A compression molding die comprises an upper die and a lower die matching the upper die, that is, the lower working surface of the upper die is arranged opposite to the upper working surface of the lower die.

[0024] A fixed template 1 is provided on the lower working surface of the upper mold. Furthermore, a punch 2 is connected to the lower working surface of the fixed template 1. The height and outer contour of the punch 2 match the pre-compression barrel 5, and the raw materials inside the pre-compression barrel 5 can be compressed and squeezed into the molding cavity 41. The punch 2 is fixedly connected to the upper mold by a screw, and an installation groove 21 is provided on the working surface corresponding to the punch 2 and the lower mold cavity 41 for installing the ejection mechanism.

[0025] Specifically, the ejection mechanism includes a fixed column 31 and a compression spring 32, wherein the fixed column 31 is arranged in a notch on the lower working surface of the fixed template 1, and the compression spring 32 is arranged in the mounting groove 21, and the top extends from the top of the mounting groove 21 to be connected with the lower end of the fixed column 31 to form a fixed end. The moment the mold is opened from a closed state, the compression spring 32 changes from a compressed state to a freely open state. During the state change of the compression spring 32, the compression spring 32 is offset from the positioning and demolding mechanism, and the rebound force of the compression spring 32 allows the product and the positioning and demolding mechanism to remain in the lower mold cavity 41.

[0026] The lower mold 4 is provided with a positioning and demoulding mechanism and a pre-compression barrel 5. The upper working surface of the lower mold 4 is stacked with a pre-compression barrel 5. The density of the raw material before being compressed is usually much smaller than the density of the product after compression molding. Therefore, the thickness of the raw material paving is much larger than the thickness of the product after compression molding. The pre-compression barrel plays the role of paving the raw material. Obviously, a number of hollow structures with the same size and corresponding to the lower mold cavity 41 are provided in the working part of the pre-compression barrel 5. The positioning and demoulding mechanism is arranged at the bottom of the lower mold cavity 41 and is arranged with the ejection mechanism. The first positioning and releasing module 61 and the second positioning and releasing module 62 are arranged corresponding to the positioning position. The first positioning and releasing module 61 and the second positioning and releasing module 62 are insert structures, and the first positioning and releasing module is provided with a demoulding bevel. The first positioning and releasing module 61 is connected through a connecting structure arranged at the bottom of the lower mold cavity 41. The second positioning and releasing module 62 is arranged on the top of the first positioning and releasing module 61, and is movably connected to the first positioning and releasing module 61, and protrudes from the bottom of the lower mold cavity 41. When the mold is closed, the movable end of the compression spring 32 is against the second positioning and releasing module 62.

[0027] Obviously, in order to facilitate mold closing and demoulding, guide columns are arranged around the fixed template 1, and guide sleeves corresponding to the positions of the guide columns are arranged around the pre-compression barrel 5.

[0028] The action process of the above technical solution is as follows: the upper mold and the lower mold are in an open state, and the raw materials required for post-molding are laid and sent into the lower mold cavity and the pre-compression barrel. Under the action of the hydraulic press, the closing action of the upper and lower molds is realized, and the guide column and the guide sleeve cooperate to realize the matching of the upper and lower molds. During this period, the upper mold punch compresses and squeezes the raw materials in the pre-compression barrel into the molding cavity. During the extrusion process, the compression spring changes from a free state to a compressed state. After the product molding process is completed, the hydraulic press releases pressure to open the upper and lower molds. At this time, the compression spring changes from a compressed state to a free state. At the moment when the upper and lower molds are separated, the rebound force of the compression spring ensures that the product and the second positioning and stripping module remain in the molding cavity of the lower mold; then, since the second positioning and stripping module is movably connected to the first positioning and stripping module, when the product is taken out of the molding cavity, the second positioning and stripping module and the product are separated from the first positioning block, and finally the product is separated from the second positioning and stripping module. The above embodiments effectively solve the technical problems of the existing fan base molded products being adsorbed on the punch and difficult to remove during demoulding, and the positioning columns being stuck and unable to be demoulded when thin embedded inserts are used, thereby greatly improving the product quality, work efficiency and process stability of mass production.

[0029] Those skilled in the art should understand that the embodiments of the present invention described above and shown in the accompanying drawings are only examples and do not limit the present invention. The purpose of the present invention has been fully and effectively achieved. The functions and structural principles of the present invention have been demonstrated and explained in the embodiments. Without departing from the principles, the embodiments of the present invention may be deformed or modified in any way.

Claims

1. A compression molding die, comprising an upper die and a lower die matched with the upper die, characterized in that: The upper mold is provided with a fixed template (1), the lower working surface of the fixed template (1) is connected to a punch (2), the punch (2) is provided with a mounting groove (21), an ejection mechanism is arranged in the mounting groove (21), a positioning and demoulding mechanism is arranged at the bottom of the lower mold (4) protruding from the lower mold cavity (41), the arrangement position of the positioning and demoulding mechanism corresponds to the arrangement position of the ejection mechanism, and a pre-compression barrel (5) is arranged on the upper working surface of the lower mold; The ejection mechanism comprises a fixed column (31) arranged on the lower working surface of the fixed template (1) and a compression spring (32) whose fixed end is connected through the fixed column (31); The positioning and demoulding mechanism comprises a first positioning and demoulding module (61) and a second positioning and demoulding module (62); the first positioning and demoulding module (61) is connected to the lower mold (4); the second positioning and demoulding module (62) is movably connected to the first positioning and demoulding module (61) and is arranged to protrude from the bottom of the cavity (41) of the lower mold; when the mold is closed, the movable end of the compression spring (32) abuts against the second positioning and demoulding module (62).

2. The compression molding die according to claim 1, characterized in that: The punch (2) is fixedly connected to the upper die via a screw.

3. The compression molding die according to claim 1, characterized in that: Guide columns are arranged around the fixed template (1).

4. The compression molding die according to claim 3, characterized in that: The pre-compression barrel (5) is provided with guide sleeves corresponding to the positions of the guide posts around it.

5. The compression molding die according to claim 1, characterized in that: The pre-compression barrel (5) is provided with a hollow structure (51) having the same size as the cavity.

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