A jig for easy stripping of through-hole burrs

Abstract

The utility model relates to provide a kind of jig of through-hole burr peeling easily. The jig includes upper die and lower die, upper die forming cavity is equipped with protrusion, lower die forming chamber is equipped with the circular groove and peripheral arc groove structure matched with protrusion, wherein the diameter of circular groove is less than the diameter of protrusion, and the diameter of arc groove is equal to the diameter of protrusion;To form fan ring surface film burr and small piece burr in through-hole position after forming, remove small piece burr by tearing to remove film residue when peeling manually.The utility model realizes the efficient cleaning of residues.

Description

Technical Field

[0001] This utility model relates to the field of material forming, and in particular to a fixture that facilitates the removal of burrs from through holes. Background Technology

[0002] Silicone injection molding has become a common manufacturing method for silicone parts in the medical, electronics, and automotive industries due to its high efficiency, ability to mold complex structures, and excellent material properties. The process typically includes five core stages: mold closing, filling, pressure holding, cooling, and demolding. In actual production, achieving a perfectly sealed mold during the mold closing stage is difficult, inevitably resulting in a thin layer of silicone overflow at the parting line, also known as the "parting line" or "flash." Therefore, removing the parting line is a crucial post-processing step for silicone injection molded parts.

[0003] When molding silicone products with through-hole structures, existing molding dies will form thin flakes of burrs at the through-hole locations. These burrs are easy to stick to the product and the mold. Because the flakes are too thin, they are difficult to clean and leave a lot of residue. When cleaning with an air gun, they fly everywhere and pollute the workshop environment. Utility Model Content

[0004] To address the aforementioned problems, this utility model provides a fixture that facilitates the removal of burrs from through-holes, enabling efficient cleaning of residues, improving product quality, reducing production costs, and improving the workshop environment.

[0005] This utility model provides a fixture for easy removal of burrs from through holes, including an upper mold and a lower mold;

[0006] A molding cavity is provided below the upper mold, and a molding chamber is provided above the lower mold. After the upper mold and the lower mold are closed, the molding cavity and the molding chamber combine to form a cavity for accommodating the product molding.

[0007] The upper mold is provided with a protrusion inside the molding cavity, and the protrusion is close to the molding chamber wall of the lower mold when the upper mold and the lower mold are closed.

[0008] Preferably, a circular groove is provided in the molding chamber of the lower mold at the position corresponding to the protrusion, and the diameter of the protrusion is larger than the diameter of the circular groove.

[0009] Preferably, the molding chamber of the lower mold has an arc-shaped groove around the circular groove, and the outer arc diameter of the arc-shaped groove is the same as the diameter of the protrusion.

[0010] This utility model provides a fixture for easy removal of burrs from through holes. By setting a specific groove structure (a combination of circular and arc-shaped grooves) in the lower mold forming chamber, the burr generation morphology and removal mechanism of the through hole area are reconstructed.

[0011] Additional aspects and advantages of this invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0012] 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:

[0013] Figure 1 This utility model provides a structural diagram of a fixture for easy removal of burrs from through holes;

[0014] Figure 2 This is a structural diagram of the upper mold provided by this utility model;

[0015] Figure 3 This is a structural diagram of the lower mold provided by this utility model;

[0016] Figure 4 This is an enlarged view of part A of the lower mold provided by this utility model. Detailed Implementation

[0017] 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.

[0018] 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.

[0019] 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.

[0020] 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.

[0021] 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.

[0022] It is important to clarify that when molding silicone products with through-hole structures, a core (or protrusion) must be included in the mold to penetrate the molding cavity. This core is typically fixed to the moving or fixed mold. During mold closing, a parting surface inevitably forms between the core and the cavity wall it mates with. However, this parting surface is also where silicone overflow occurs, ultimately forming thin burrs at the through-holes of the product.

[0023] like Figure 1 , Figure 2 , Figure 3 As shown, this utility model provides a fixture for easy removal of burrs from through holes, including an upper mold 1 and a lower mold 2;

[0024] A molding cavity 11 is provided below the upper mold 1, and a molding chamber 21 is provided above the lower mold 2. After the upper mold 1 and the lower mold 2 are closed, the molding cavity 11 and the molding chamber 21 combine to form a cavity for accommodating the product molding.

[0025] The upper mold 1 is provided with a protrusion 111 inside the molding cavity 11. The protrusion 111 is close to the wall of the molding chamber 21 of the lower mold 2 when the upper mold 1 and the lower mold 2 are closed.

[0026] As can be seen in this embodiment, due to the setting of the protrusion 111, a through hole can be formed after the product is formed.

[0027] like Figure 4 As shown, in some embodiments, a circular groove 211 is provided in the molding chamber 21 of the lower mold 2 at the position corresponding to the protrusion 111, and the diameter of the protrusion 111 is larger than the diameter of the circular groove 211.

[0028] In this embodiment, it is understood that if the protrusion 111 and the molding chamber 21 are in surface contact, the excess glue on the parting surface will form a thin film (burr) after molding. After demolding, the burr will block the through hole of the product and is not easy to clean. However, in this embodiment, the contact surface between the protrusion 111 and the molding chamber 21 is an annular contact surface. Molten silicone will overflow from the annular contact surface into the circular groove 211. After molding, an annular thin film burr will be formed at the through hole of the product, as well as a small piece of burr in the middle of the thin film burr that is the same shape as the circular groove 211. At this time, it is only necessary to manually peel off the small piece of burr. The small piece of burr will take away from the annular thin film burr. It is also understood that the closer the diameter of the circular groove 211 is to the diameter of the protrusion, the narrower the annular contact surface, the easier it is to peel off the burr, and the less residue remains.

[0029] The molding chamber 21 of the lower mold 2 has an arc-shaped groove 212 on the periphery of the circular groove 211. The outer arc diameter of the arc-shaped groove 212 is the same as the diameter of the protrusion 111.

[0030] In this embodiment, it is understood that when only a circular groove 211 is provided in the molding chamber 21, due to the large contact area between the small burrs and the circular groove 211, and due to the gravity of the small burrs, the small burrs are easily left in the circular groove 211 when the product is demolded. This requires cleaning the mold with an air gun, leading to pollution of the workshop environment. Of course, the diameter of the circular groove 211 can be reduced to increase the area of ​​the annular film burrs, or the relative height between the protrusion 111 and the molding chamber 21 can be controlled (controlling the gap between the protrusion and the molding chamber wall) to increase the thickness of the annular film burrs. This increases the connection strength between the annular film burrs and the small burrs, allowing the product to carry the small burrs out of the mold during demolding. However, increasing either the area or the thickness of the annular film burrs will increase the difficulty of peeling. Specifically, when removing the small burrs... When peeling from the product, because the peeling direction can only be towards one side, the other side of the annular film burr is prone to leave residue. In this embodiment, because the diameter of the arc-shaped groove 212 is the same as the diameter of the protrusion 111, the protrusion 111 and the molding chamber 21 are in line contact on the side near the arc-shaped groove 212, and in surface contact (fan-shaped annular surface) on the side away from the arc-shaped groove 212. It is understood that the side in line contact will not produce burrs or will produce very few burrs; the side in surface contact produces fan-shaped annular film burrs. At this time, the area of ​​the fan-shaped annular film burrs is adjusted (i.e., the diameter of the circular groove is adjusted), or the thickness of the arc-shaped film burrs is adjusted (i.e., the relative height between the protrusion and the molding chamber is adjusted), thereby increasing the connection force of the fan-shaped annular film burrs to the small burrs, so that the small burrs can be carried out when the product is demolded. After the product is demolded, it is only necessary to peel it off from the side of the fan-shaped annular film burrs with the small burrs.

[0031] 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.

[0032] 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 jig for easy removal of burrs from through-holes, characterized in that, Including upper mold and lower mold; A molding cavity is provided below the upper mold, and a molding chamber is provided above the lower mold. After the upper mold and the lower mold are closed, the molding cavity and the molding chamber combine to form a cavity for accommodating the product molding. The upper mold is provided with a protrusion inside the molding cavity, and the protrusion is close to the molding chamber wall of the lower mold when the upper mold and the lower mold are closed.

2. The fixture for easy removal of burrs from through-holes according to claim 1, characterized in that, A circular groove is provided in the molding chamber of the lower mold at the position corresponding to the protrusion, and the diameter of the protrusion is larger than the diameter of the circular groove.

3. The fixture for easy removal of burrs from through-holes according to claim 2, characterized in that, The lower mold has an arc-shaped groove around the circular groove in the molding chamber, and the outer arc diameter of the arc-shaped groove is the same as the diameter of the protrusion.

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