Injection mold for silica gel balls

Abstract

The utility model discloses a kind of injection mould of silica gel ball, including lower mould plate, the lower mould plate is equipped with slide rail, the slide rail is equipped with relatively matched operation left mould core and right mould core, the opposite face of the left mould core and right mould core is respectively provided with the left forming groove and right forming groove of alignment buckling, the lower mould plate is equipped with the lower forming groove being communicated with left forming groove and right forming groove, the left forming groove, right forming groove and lower forming groove cooperation form injection chamber, the utility model silica gel ball injection mould effectively solves the problem that spherical silica gel piece is easily deformed when injection molding, significantly improve the dimensional accuracy and stability of product;Specifically, spherical filler provides uniform support during injection molding, reduces the deformation caused by uneven material shrinkage, while the accurate buckling of left mould core and right mould core on slide rail ensures the consistency of forming gap, thereby optimizing wall thickness control, enhancing finished product quality.

Description

Technical Field

[0001] This utility model relates to the field of silicone ball production technology, specifically to an injection mold for silicone balls. Background Technology

[0002] As described in the published patent CN206374128U, "Injection Mold Applicable to Spherical Plastic Parts," some products on the market currently use spherical plastic parts, such as... Figure 1 The image shows a spherical plastic panel. Because this type of panel is spherical and has a thin wall, it is prone to deformation during the injection molding process due to the plasticity of the plastic itself. The dimensions of the finished product are difficult to control, and the stability is poor.

[0003] In summary, existing spherical plastic or silicone parts are prone to deformation during injection molding due to the special nature of their spherical shape. Utility Model Content

[0004] To overcome the shortcomings mentioned above, this utility model aims to provide a technical solution that can solve the above problems.

[0005] To achieve the above objectives, this utility model provides the following technical solution:

[0006] An injection mold for silicone balls includes a lower mold plate, a slide rail on the lower mold plate, and a left mold core and a right mold core that cooperate with each other on the slide rail. A left molding groove and a right molding groove for alignment and fastening are respectively opened on the opposite surfaces of the left mold core and the right mold core. A lower molding groove is provided on the lower mold plate, which communicates with the left molding groove and the right molding groove. The left molding groove, the right molding groove and the lower molding groove cooperate to form an injection cavity.

[0007] The left and right mold cores have left and right pipe grooves respectively on their opposite surfaces. The left and right pipe grooves interlock to form an installation pipe that communicates with the injection cavity. A connecting pipe is installed inside the installation pipe. The lower end of the connecting pipe is provided with a spherical filler that fills the injection cavity. The spherical filler and the injection cavity cooperate to form a molding gap for product molding.

[0008] As a further embodiment of this utility model: a pressure regulating pipe is provided inside the connecting pipe, and a pressure regulating cavity is provided inside the spherical filler that communicates with the pressure regulating pipe. The spherical filler expands and contracts within the injection molding cavity.

[0009] As a further embodiment of the present invention: the spherical filler includes a polyimide film ball that is sealed and fixed to the lower end of the connecting tube, and the outer surface of the polyimide film ball is covered with an organosilicon release layer.

[0010] As a further embodiment of this utility model: a left mounting groove and a right mounting groove are respectively provided on the opposite surfaces of the left mold core and the right mold core, and elastic mounting parts with elastic abutment are installed in the left mounting groove and the right mounting groove.

[0011] As a further embodiment of this utility model: multiple oblique mounting grooves are respectively provided on the left mold core and the right mold core, oblique fixing rods are installed in the oblique mounting grooves, and upper templates are installed on the left mold core and the right mold core.

[0012] As a further embodiment of this utility model: an injection port communicating with the injection molding chamber is provided between the left mold core and the right mold core.

[0013] As a further embodiment of this utility model: at least two injection molding chambers are symmetrically arranged along the slide rail.

[0014] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0015] This utility model of silicone ball injection mold effectively solves the problem of easy deformation of spherical silicone parts during injection molding by setting a spherical filler in the injection cavity and cooperating with the molding gap formed by the left molding groove, right molding groove and lower molding groove, which significantly improves the dimensional accuracy and stability of the product. Specifically, the spherical filler provides uniform support during injection molding, reducing deformation caused by uneven material shrinkage. At the same time, the precise engagement of the left mold core and right mold core on the slide rail ensures the consistency of the molding gap, thereby optimizing wall thickness control and enhancing the quality of the finished product. Attached Figure Description

[0016] Figure 1 This is a three-dimensional structural view of the present invention;

[0017] Figure 2 This is another three-dimensional view of the structure of this utility model;

[0018] Figure 3 This is a three-dimensional view of the internal structure of this utility model after removing the upper template;

[0019] Figure 4 This is a three-dimensional view of the internal structure of this utility model after removing the upper template;

[0020] Figure 5 This is a three-dimensional view of the internal structure of this utility model excluding the left mold core;

[0021] Figure 6 This is a perspective view of the internal structure of this utility model excluding the left mold core;

[0022] Figure 7 This is a three-dimensional structural view of the left mold core and the right mold core in this utility model;

[0023] Figure 8This is a front view of the structure of this utility model excluding the left mold core;

[0024] Figure 9 yes Figure 8 A cross-sectional view along the AA direction;

[0025] The reference numerals and names in the figure are as follows:

[0026] Lower mold plate - 101, slide rail - 102, left mold core - 103, right mold core - 104, left forming groove - 105, right forming groove - 106, lower forming groove - 107, injection cavity - 108, left pipe groove - 109, right pipe groove - 110, installation pipe - 111, connecting pipe - 112, spherical filler - 113, forming gap - 114, pressure regulating pipe - 115, pressure regulating cavity - 116, polyimide film ball - 117, right side mounting groove - 120, elastic mounting part - 121, oblique mounting groove - 122, oblique fixing rod - 123, upper mold plate - 124, injection port - 125. Detailed Implementation

[0027] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0028] Please see Figure 1-9 An injection mold for silicone balls includes a lower mold plate 101, a slide rail 102 on the lower mold plate 101, a left mold core 103 and a right mold core 104 that cooperate with each other on the slide rail 102, a left molding groove 105 and a right molding groove 106 that are respectively opened on the opposite surfaces of the left mold core 103 and the right mold core 104, and a lower molding groove 107 that communicates with the left molding groove 105 and the right molding groove 106. The left molding groove 105, the right molding groove 106 and the lower molding groove 107 cooperate to form an injection cavity 108.

[0029] The left mold core 103 and the right mold core 104 are respectively provided with a left pipe groove 109 and a right pipe groove 110 on their opposite surfaces. The left pipe groove 109 and the right pipe groove 110 are interlocked to form an installation pipe 111 that communicates with the injection molding chamber 108. A connecting pipe 112 is installed in the installation pipe 111. The lower end of the connecting pipe 112 is provided with a spherical filler 113 that is filled in the injection molding chamber 108. The spherical filler 113 and the injection molding chamber 108 cooperate to form a molding gap 114 for product molding.

[0030] This utility model of silicone ball injection mold fundamentally solves the deformation problem that is easily caused by the lack of internal support and uneven cooling shrinkage during the injection of existing spherical thin-walled silicone / plastic parts during injection molding by incorporating a spherical filler 113 supported by a connecting pipe 112 inside the injection chamber 108, and working synergistically with the molding gap 114 formed by the precise cooperation of the left mold core 103, the right mold core 104 and the lower mold plate 101. This significantly improves the dimensional accuracy, geometric consistency (especially sphericity) and batch stability of the product.

[0031] The spherical filler 113 occupies the core position of the product cavity during injection molding, providing a uniform and stable internal support skeleton for the molten silicone. It effectively resists the collapse, warping and irregular deformation of silicone caused by fluid pressure, gravity or its own shrinkage stress during the filling, holding and cooling curing stages, and especially ensures the shape retention ability of the spherical thin-walled area.

[0032] The molding gap 114 formed between the left molding groove 105, the right molding groove 106, the lower molding groove 107 and the outer surface of the spherical filler 113 is strictly limited in size and shape by the precision machining of the mold and the mold closing action, which directly determines the wall thickness of the final product. This design achieves high uniformity and controllability of wall thickness, eliminating the wall thickness fluctuation caused by melt flow differences or lack of inner mold in traditional cavity injection molding.

[0033] The presence of molding gap 114 forces the silicone material to flow and solidify in the narrow space between the filler and the mold cavity wall, which is conducive to more uniform and rapid heat dissipation through the metal mold, thereby reducing uneven shrinkage and internal stress caused by excessive differences in cooling rates between inner and outer layers or regions, and further suppressing the tendency to deform.

[0034] The connecting tube 112 securely positions the spherical filler 113 within the mounting tube 111, which is precisely formed by the interlocking of grooves on the left and right mold cores 104. This design ensures the stability and concentricity of the filler during high-pressure injection molding, avoiding displacement or vibration from affecting molding accuracy. At the same time, the structure is compact and reliable, and it is easy to manufacture, assemble and maintain the mold.

[0035] This utility model of silicone ball injection mold effectively solves the problem of easy deformation of spherical silicone parts during injection molding by setting a spherical filler 113 in the injection chamber 108 and cooperating with the molding gap 114 formed by the left molding groove 105, the right molding groove 106 and the lower molding groove 107, and significantly improves the dimensional accuracy and stability of the product. Specifically, the spherical filler 113 provides uniform support during the injection process, reducing deformation caused by uneven material shrinkage. At the same time, the precise engagement of the left mold core 103 and the right mold core 104 on the slide rail 102 ensures the consistency of the molding gap 114, thereby optimizing wall thickness control and enhancing the quality of the finished product.

[0036] In this embodiment of the utility model, a pressure regulating pipe 115 is provided inside the connecting pipe 112, and a pressure regulating cavity 116 communicating with the pressure regulating pipe 115 is provided inside the spherical filler 113. The spherical filler 113 expands and contracts inside the injection molding chamber 108.

[0037] This utility model of silicone ball injection mold adds a pressure regulating cavity 116 and a connecting pressure regulating pipe 115 to the spherical filler 113, enabling the filler to have dynamic adjustment capability. During injection, after the injection material is filled, before the silicone ball is shaped, the silicone ball inflates and expands to tightly support the molding cavity wall, accurately controlling the uniformity of the gaps in various parts of the thin-walled ball, and completely eliminating the collapse deformation caused by the unbalanced melt flow. Before demolding, the venting and shrinkage actively detaches from the inner wall of the product, completely avoiding the product stretching deformation and damage caused by vacuum adsorption or mechanical friction during demolding of traditional rigid fillers. At the same time, this design significantly reduces the complexity of the mold and the risk of wear, taking into account both molding accuracy and demolding reliability.

[0038] In this embodiment of the present invention, the spherical filler 113 includes a polyimide film ball 117 that is sealed and fixed to the lower end of the connecting tube 112, and the outer surface of the polyimide film ball 117 is covered with an organosilicon release layer.

[0039] This utility model of silicone ball injection mold achieves dual optimization effects through a composite structure design using a polyimide film ball 117 coated with an organosilicon release layer: the excellent flexibility and high-temperature stability of the polyimide film ensure that the spherical filler 113 can accurately maintain the spherical contour during inflation and contraction, avoiding fatigue cracking caused by repeated deformation; while the surface organosilicon release layer significantly reduces the adhesion between the molten silicone and the filler, eliminating scratches or deformation defects on the inner wall of the product caused by adhesion during demolding, and reducing the need for release agent. At the same time, this composite structure greatly improves the durability of the filler in high-temperature and high-pressure injection molding environment, taking into account both efficient demolding and long-term reliability.

[0040] In this embodiment of the utility model, a left mounting groove and a right mounting groove 120 are respectively provided on the opposite surfaces of the left mold core 103 and the right mold core 104, and an elastic mounting member 121 with elastic abutment is installed in the left mounting groove and the right mounting groove 120.

[0041] This utility model of silicone ball injection mold significantly improves the dynamic stability and service life of the mold by setting elastic mounting parts 121 in the mounting grooves of the left and right mold cores 104 and achieving abutment fit: the elastic mounting parts 121 effectively buffer the impact force of mold closing, avoid mold core damage or displacement of precision parts (such as connecting pipe 112 / spherical filler 113) caused by hard contact, and continuously provide adaptive compensation pressure to ensure that the left and right mold cores 104 always maintain a tight and uniform interlocking state under injection high pressure and thermal expansion and contraction conditions, and eliminate flash or wall thickness deviation caused by micro gaps; this design not only enhances the sealing reliability of the molding chamber to ensure the geometric accuracy of the product, but also greatly reduces the mold maintenance frequency and component replacement cost.

[0042] In this embodiment of the utility model, a plurality of oblique mounting grooves 122 are respectively provided on the left mold core 103 and the right mold core 104, and oblique fixing rods 123 are installed in the oblique mounting grooves 122. The upper template 124 is installed on the left mold core 103 and the right mold core 104.

[0043] This utility model of silicone ball injection mold significantly enhances the overall rigidity and dynamic stability of the mold by setting an inclined fixing rod 123 between the upper template 124 and the left and right mold cores 104. The inclined fixing rod 123 generates a radial locking force when the mold is closed, effectively resisting the lateral separation effect of the injection high pressure on the left and right mold cores 104, ensuring that the molding chamber remains in a precise closed state under extreme pressure, and eliminating flash. At the same time, this design optimizes the transmission path of the mold closing force, reduces the risk of deformation of the mold core due to local stress concentration, and significantly improves the motion accuracy and reset consistency of the moving mold core through multi-angle constraints, thereby ensuring the uniformity of wall thickness and geometric accuracy of the spherical product.

[0044] In this embodiment of the present invention, an injection port 125 communicating with the injection chamber 108 is provided between the left mold core 103 and the right mold core 104.

[0045] This utility model of silicone ball injection mold achieves dynamic optimization of the injection process by directly opening the injection port 125 between the left and right mold cores 104 and connecting it to the injection cavity 108. It effectively balances the fluid pressure and filling rate in the cavity, while significantly shortening the melt flow path. This ensures synchronous filling and uniform cooling of all areas of the thin-walled sphere, greatly reducing the risk of shrinkage deformation caused by filling differences, and ultimately improving the uniformity of product wall thickness, sphericity accuracy, and yield.

[0046] In this embodiment of the present invention, at least two injection molding chambers 108 are symmetrically arranged along the slide rail 102;

[0047] This utility model of silicone ball injection mold significantly improves mold capacity and process stability through the design of at least two injection chambers 108 symmetrically arranged along the slide rail 102. The multi-chamber symmetrical layout makes full use of the mold space to achieve parallel production, which multiplies the output efficiency of silicone balls in a single injection. At the same time, the symmetrical structure ensures uniform distribution of clamping force and avoids wear of the slide rail 102 or misalignment of the mold core due to uneven load. The injection process of each chamber is independently controlled to maintain melt flow balance and cooling consistency. In mass production, it can still stably guarantee the uniformity of wall thickness, spherical accuracy and dimensional qualification rate of each product, significantly reducing unit cost and improving mass production economy.

[0048] As described in the published patent CN211868476U, "An Automatic Demolding Mechanism for Silicone Molds," existing demolding methods, such as forceful pulling demolding, may damage the injected silicone products. Demolding is time-consuming, laborious, inconvenient, inefficient, difficult, and has a low degree of automation, and urgently needs improvement. The demolding method of this utility model for silicone ball injection molds can significantly improve demolding speed and quality, and greatly improve production efficiency.

[0049] It will be apparent to those skilled in the art that this invention is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or essential characteristics of this invention. Therefore, the embodiments should be considered illustrative and non-limiting in all respects, and the scope of this invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within this invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

Claims

1. An injection mold for silicone balls, characterized in that, The system includes a lower template (101), on which a slide rail (102) is provided. The slide rail (102) is provided with a left mold core (103) and a right mold core (104) that cooperate with each other. The left mold core (103) and the right mold core (104) are respectively provided with a left forming groove (105) and a right forming groove (106) for alignment and fastening on their opposite surfaces. The lower template (101) is provided with a lower forming groove (107) that communicates with the left forming groove (105) and the right forming groove (106). The left forming groove (105), the right forming groove (106) and the lower forming groove (107) cooperate to form an injection molding chamber (108). The left mold core (103) and the right mold core (104) have a left pipe groove (109) and a right pipe groove (110) respectively on their opposite surfaces. The left pipe groove (109) and the right pipe groove (110) interlock to form an installation pipe (111) that communicates with the injection molding chamber (108). A connecting pipe (112) is installed in the installation pipe (111). The lower end of the connecting pipe (112) is provided with a spherical filler (113) that is filled in the injection molding chamber (108). The spherical filler (113) and the injection molding chamber (108) cooperate to form a molding gap (114) for product molding.

2. The injection mold for a silicone ball according to claim 1, characterized in that, The connecting pipe (112) is provided with a pressure regulating pipe (115), and the spherical filler (113) is provided with a pressure regulating cavity (116) connected to the pressure regulating pipe (115). The spherical filler (113) expands and contracts in the injection molding chamber (108).

3. The injection mold for a silicone ball according to claim 2, characterized in that, The spherical filler (113) includes a polyimide film ball (117) that is sealed and fixed to the lower end of the connecting tube (112), and the outer surface of the polyimide film ball (117) is covered with an organosilicon release layer.

4. The injection mold for a silicone ball according to any one of claims 1-3, characterized in that, Left mounting groove and right mounting groove (120) are respectively provided on the opposite surfaces of the left mold core (103) and the right mold core (104). The left mounting groove and the right mounting groove (120) are provided with elastic mounting parts (121) that fit together elastically.

5. The injection mold for a silicone ball according to claim 4, characterized in that, Multiple oblique mounting slots (122) are provided on the left mold core (103) and the right mold core (104), and oblique fixing rods (123) are installed in the oblique mounting slots (122). Upper templates (124) are installed on the left mold core (103) and the right mold core (104).

6. The injection mold for a silicone ball according to claim 5, characterized in that, An injection port (125) communicating with the injection chamber (108) is provided between the left mold core (103) and the right mold core (104).

7. The injection mold for a silicone ball according to claim 5, characterized in that, At least two injection molding chambers (108) are symmetrically arranged along the slide rail (102).

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