A 45-degree parting O-ring mold

Abstract

This utility model relates to the technical field of rubber sealing ring production, specifically a 45-degree parting O-ring mold. Multiple frustums are evenly distributed on the lower surface of the upper mold plate, and annular upper mold cavities are provided on the side walls of the frustums. Multiple conical holes corresponding to the frustums are provided on the upper surface of the lower mold plate, and lower mold cavities adapted to the upper mold cavities are provided on the side walls of the conical holes. A first frustum surface is provided between the lower surface of the upper mold plate and the side wall of the upper mold cavity, and a second frustum surface is provided between the lower end face of the frustum and the other side wall of the upper mold cavity. A third frustum surface is provided between the upper surface of the lower mold plate and the side wall of the lower mold cavity, and a fourth frustum surface is provided between the bottom surface of the conical hole and the other side wall of the lower mold cavity. The parting line of this mold is located on both ends of the O-ring, which can avoid the adverse effects of flash residue. Because the flash near the O-ring is thinner and easier to tear off, high work efficiency and good trimming effect can be obtained whether manual tearing or a freeze trimming process is used.

Description

Technical Field

[0001] This utility model relates to the technical field of rubber sealing ring production, specifically a 45-degree parting O-ring mold. Background Technology

[0002] O-rings are used between connecting parts of equipment to provide a seal. Currently, O-ring seals for industrial equipment come in various sizes and specifications, and their structure consists of either a 180° or 45° parting surface. They are manufactured by pressing together the upper and lower mold plates. The 180° parting surface means that after the mold is closed, the mating surface of the upper and lower mold plates is parallel to the annular surface of the O-ring. There is a horizontally extending mold gap on each side of the mold cavity. The rubber O-rings produced by this 180° parting surface mold will have protruding flash on both the inner and outer surfaces. The area with flash is exactly the working surface of the O-ring. Even after subsequent tearing and trimming, it cannot be completely eliminated. The protruding flash debris is easily worn down during equipment operation, and the falling residue can generate foreign objects, which can easily cause blockages and jamming inside the equipment. To address the shortcomings of 180° parting molds, existing technology has developed a 45° parting O-ring mold. This mold features an upper mold plate with a 45° taper cone and a lower mold plate with a 45° taper recess. After mold closing, the cone of the upper mold plate precisely inserts into the recess of the lower mold plate. The mold cavity is located on the sidewalls of the cone and recess. The parting line of this 45° parting mold forms a 45° angle with the annular surface of the O-ring. Rubber O-rings produced using this mold have flash located on both ends of the O-ring, avoiding the working surface. This prevents easy wear during equipment operation and avoids the shedding of residue and foreign matter due to friction, thus reducing the requirements for subsequent edge trimming and finishing processes. However, because the cone's inclined surface moves relative to the mold during closing, inaccurate positioning can easily cause the sidewalls of the cone and recess to collide and rub against each other, damaging the mold. For example, Chinese Patent 2019213115779 discloses "A 45° O-ring Processing Module," authorized publication number CN210308610U. This processing module includes an upper base and a lower base. An upper template is connected to the lower part of the upper base, and an upper mold core is connected to the lower end of the upper template. The upper templates are arranged in a square on the surface of the upper base, and the upper mold cores are arranged in a square at the lower end of the upper templates. A lower template is connected to the upper part of the lower base, and a lower mold cavity is connected to the upper end of the lower template. The lower templates are arranged in a square on the surface of the lower base, and the lower mold cavity is arranged in a square at the upper end of the lower templates. Spring grooves are provided at two parallel edges of the lower base, and buffer springs are installed inside the spring grooves. Positioning grooves are provided at the other two parallel edges of the lower base. Guide pins are connected to the four corners of the lower base, and guide grooves are provided on the upper base at positions corresponding to the guide pins. The processing module has a positioning pin structure between the upper and lower molds, which can realize the positioning of the upper and lower molds during the mold closing process, thus solving the aforementioned technical problems to a certain extent. However, the positioning pins are located at the four top corners of the lower base. In order to achieve accurate positioning of the upper and lower molds, at least two sets of positioning pin structures are required. Furthermore, during mold closing, multiple sets of positioning pins must be accurately positioned one by one, which increases the complexity of the structure.In addition, regardless of whether it is a 180° parting mold or a 45° parting mold, the flash produced by the parting line is a thin sheet of equal thickness. When tearing the flash, you need to be especially careful so that the break point is exactly at the junction of the O-ring and the flash. Otherwise, it is easy to cause residual fragments or damage to the O-ring. Utility Model Content

[0003] In view of the shortcomings of the existing technology, the purpose of this utility model is to provide an O-ring mold with a 45-degree split, which improves the efficiency of mold splitting, mold closing and edge tearing, avoids mold damage during mold closing, and improves the efficiency and quality of edge tearing.

[0004] The technical solution adopted by this utility model to solve the technical problem is:

[0005] This utility model discloses a 45-degree parting O-ring mold, comprising an upper mold plate and a lower mold plate. The lower surface of the upper mold plate has a plurality of truncated cones evenly distributed, and an annular upper mold cavity is provided on the side wall of each truncated cone. The upper surface of the lower mold plate has a plurality of conical holes corresponding to the truncated cones, and a lower mold cavity adapted to the upper mold cavity is provided on the side wall of each conical hole. The lower surface of the upper mold plate is lower than the highest point of the upper mold cavity, and a first truncated cone surface is provided between the lower surface of the upper mold plate and the side wall of the upper mold cavity; a second truncated cone surface is provided between the lower end face of each truncated cone and the other side wall of the upper mold cavity; a third truncated cone surface is provided between the upper surface of the lower mold plate and the side wall of the lower mold cavity; and a fourth truncated cone surface is provided between the bottom surface of each conical hole and the other side wall of the lower mold cavity. The bottom surface of each conical hole is higher than the lowest point of the lower mold cavity.

[0006] With this solution, after the mold is closed, it can form connected 45-degree and 180-degree parting lines, which will generate 45-degree flash and 180-degree flash, which is beneficial for subsequent flash removal operations.

[0007] Preferably, after the upper and lower templates are closed, the gap between the lower surface of the upper template and the upper surface of the lower template is greater than the gap between the first and third frustum surfaces; the gap between the lower end face of the frustum and the bottom surface of the cone hole is greater than the gap between the second and fourth frustum surfaces.

[0008] With this solution, the 45-degree flash connected to the O-ring is relatively thin, and can be removed manually or by using a freeze trimming machine, thereby improving production efficiency and reducing waste in the trimming step.

[0009] Preferably, the lower surface of the upper template or the upper surface of the lower template is provided with a first overflow groove surrounding the frustum.

[0010] With this solution, after the mold is closed, a large overflow groove structure is formed between the lower surface of the upper mold plate and the upper surface of the lower mold plate, which can be used to store excess glue during the production process.

[0011] Preferably, the lower end face of the frustum or the bottom surface of the conical hole is provided with a second overflow groove surrounding the central axis of the frustum.

[0012] With this solution, after the mold is closed, a large overflow groove structure is formed between the lower end face of the cone body and the bottom face of the cone hole, which can be used to store excess glue material during the production process.

[0013] Preferably, a positioning hole is provided at the center of the lower surface of the upper template, and a rib for circumferential positioning is provided on the side wall of the positioning hole. A positioning post adapted to the positioning hole is provided at the center of the upper surface of the lower template, and a limiting groove adapted to the rib is provided on the side wall of the positioning post.

[0014] With this solution, the upper and lower templates can be easily aligned during mold closing, preventing damage to the mold.

[0015] Preferably, the positioning hole and the positioning post are both frustoconical structures, the rib is a strip structure with equal width at the top and bottom distributed longitudinally along the generatrix of the positioning hole, and the limiting groove is a strip structure with narrow bottom and wide top distributed longitudinally along the generatrix of the positioning post, and the width of the narrowest part of the limiting groove is just enough to accommodate the rib.

[0016] With this solution, the upper and lower templates can be easily aligned during mold closing, preventing damage to the mold.

[0017] Thanks to the aforementioned structure, the parting line of the mold is located on both ends of the O-ring, avoiding the adverse effects of flash residue. Furthermore, because the flash near the O-ring is thinner and easier to tear off, both manual tearing and cryogenic trimming processes achieve high work efficiency and good trimming results. Attached Figure Description

[0018] Figure 1 This is a partial cross-sectional view of the template in one embodiment of the present invention.

[0019] Figure 2 This is a partial sectional view of the lower template.

[0020] Figure 3 This is a schematic diagram of a partial cross-sectional structure after the mold is closed.

[0021] Figure 4 yes Figure 3 An enlarged schematic diagram of the structure of part A.

[0022] Figure 5 This is a top view of the lower template structure. Detailed Implementation

[0023] 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.

[0024] like Figure 1 , Figure 2 As shown, the O-ring mold of this utility model with a 45-degree parting line includes an upper mold plate 1 and a lower mold plate 2, both of which are rectangular plate structures. Multiple frustums 11 are evenly distributed on the lower surface of the upper mold plate 1, with the angle between the generatrix of each frustum 11 and its end face being 45 degrees, forming a 45-degree parting surface between the upper mold plate 1 and the lower mold plate 2. An annular upper mold cavity 12 is provided on the side wall of each frustum 11; the upper surface of the lower mold plate 2 is provided with multiple conical holes 21 corresponding to the frustums 11, and a lower mold cavity 22 adapted to the upper mold cavity 12 is provided on the side wall of each conical hole 21. Figure 3 As shown, after the mold is closed, the cone-shaped bodies 11 are inserted into the cone holes 21 one by one, and the upper mold cavity 12 and the lower mold cavity 22 are joined together to form a complete mold cavity. During the production process, rubber material is put into the mold cavity and formed into an O-ring after compression and vulcanization.

[0025] like Figure 4 As shown, the lower surface of the upper template 1 is lower than the highest point of the upper mold cavity 12, and a first frustum surface 13 is provided between the lower surface of the upper template 1 and the side wall of the upper mold cavity 12. A second frustum surface 14 is provided between the lower end face of the frustum body 11 and the other side wall of the upper mold cavity 12. Both the first frustum surface 13 and the second frustum surface 14 are frustum-shaped structures with a larger upper surface and a smaller lower surface. A third frustum surface 23 is provided between the upper surface of the lower template 2 and the side wall of the lower mold cavity 22, and a fourth frustum surface 24 is provided between the bottom surface of the conical hole 21 and the other side wall of the lower mold cavity 22. The bottom surface of the conical hole 21 is higher than the lowest point of the lower mold cavity 22. The third frustum surface 23 and the fourth frustum surface 24 are also frustum-shaped structures with a larger upper surface and a smaller lower surface.

[0026] like Figure 3 , Figure 4As shown, after the upper mold 1 and the lower mold 2 are closed, the gap between the lower surface of the upper mold 1 and the upper surface of the lower mold 2 is greater than the gap between the first frustum surface 13 and the third frustum surface 23. In this embodiment, the gap between the first frustum surface 13 and the third frustum surface 23 is 1 / 2 to 2 / 3 of the gap between the lower surface of the upper mold 1 and the upper surface of the lower mold 2. In this way, two rings of flash with different thicknesses will be generated on the outer side of the vulcanized O-ring. The inner ring flash that is close to the O-ring has a smaller thickness and the outer ring flash has a larger thickness. When tearing or trimming, the flash is easier to tear from the thinner inner ring flash, resulting in high trimming efficiency, good effect, and less residual flash debris. In addition, the gap between the lower end face of the frustum body 11 and the bottom surface of the cone hole 21 is greater than the gap between the second frustum surface 14 and the fourth frustum surface 24. The gap between the second frustum surface 14 and the fourth frustum surface 24 is 1 / 2 to 2 / 3 of the gap between the lower end face of the frustum body 11 and the bottom face of the conical hole 21. In this way, two rings of flash with different thicknesses will be generated on the inner side of the vulcanized O-ring. The outer ring flash, which is close to the O-ring, is thinner and the inner ring flash is thicker. During the tearing or trimming operation, the flash is easier to tear from the thinner outer ring flash, resulting in high trimming efficiency, good effect, and less residual flash debris.

[0027] Furthermore, as a further improvement of this utility model, the lower surface of the upper template 1 or the upper surface of the lower template 2 is provided with a first overflow groove 15 surrounding the frustum 11. Figure 4 As shown, in one embodiment of this utility model, the first overflow groove 15 can be disposed on the lower surface of the upper mold plate 1. The cross-section of the first overflow groove 15 is a semi-ellipse or semi-circle. In this case, the corresponding position of the upper surface of the lower mold plate 2 is a plane. After the mold is closed, the first overflow groove 15 is connected to the mold cavity through the gap between the lower surface of the upper mold plate 1 and the upper surface of the lower mold plate 2. Excess glue during the production process is stored in the first overflow groove 15. Of course, in another embodiment of this utility model, the first overflow groove 15 can also be disposed on the upper surface of the lower mold plate 2, and its working principle is the same as that disposed on the lower surface of the upper mold plate 1.

[0028] Additionally, a second overflow groove 16 surrounding the central axis of the frustum 11 is provided on the lower end face of the frustum 11 or the bottom surface of the conical hole 21. For example... Figure 4As shown, in one embodiment of this utility model, the second overflow groove 16 can be disposed on the lower end face of the frustum 11. The cross-section of the second overflow groove 16 is a semi-ellipse or semi-circle. In this case, the bottom surface of the conical hole 21 is a plane. After mold closing, the second overflow groove 16 is connected to the mold cavity through the gap between the lower end face of the frustum 11 and the bottom surface of the conical hole 21. Excess glue during production is stored in the second overflow groove 16. Of course, in another embodiment of this utility model, the second overflow groove 16 can also be disposed on the bottom surface of the conical hole 21, and its working principle is the same as that disposed on the lower end face of the frustum 11.

[0029] As a further improvement to this utility model, such as Figure 1 , Figure 2 , Figure 5 As shown, a positioning hole 17 is provided at the center of the lower surface of the upper template 1, and a rib 18 for circumferential positioning is provided on the side wall of the positioning hole 17. A positioning post 25 adapted to the positioning hole 17 is provided at the center of the upper surface of the lower template 2, and a limiting groove 26 adapted to the rib 18 is provided on the side wall of the positioning post 25. Both the positioning hole 17 and the positioning post 25 are frustoconical structures. The rib 18 is a strip-shaped structure with equal width at the top and bottom, distributed longitudinally along the generatrix of the positioning hole 17. The limiting groove 26 is a strip-shaped structure with narrow bottom and wide top, distributed longitudinally along the generatrix of the positioning post 25. The width of the narrowest part of the limiting groove 26 is just enough to accommodate the rib 18. At least three ribs 18 are evenly distributed on the sidewall of the positioning hole 17, and at least three corresponding limiting grooves 26 are distributed on the sidewall of the positioning post 25. Before mold closing, the orientation of the mold plates is initially determined according to the length and width directions of the upper mold plate 1 and the lower mold plate 2. When the mold is closed, the positioning post 25 on the lower mold plate 2 is aligned with the positioning hole 17 on the upper mold plate 1, and the limiting groove 26 on the positioning post 25 is aligned with the ribs 18 in the positioning hole 17. In the initial stage of mold closing, since the upper opening of the limiting groove 26 is relatively wide, even if the position of the ribs 18 is slightly deviated, as the upper mold plate 1 and the lower mold plate 2 gradually move closer to each other, the position of the ribs 18 can be gradually corrected. Finally, the ribs 18 are engaged in the narrowest part of the lower end of the limiting groove 26, accurately positioning the position of the mold cavity.

[0030] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art 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 appended claims and their equivalents.

Claims

1. A 45-degree parting O-ring mold, comprising an upper mold plate (1) and a lower mold plate (2), wherein a plurality of frustums (11) are evenly distributed on the lower surface of the upper mold plate (1), and an annular upper mold cavity (12) is provided on the side wall of the frustums (11); a plurality of conical holes (21) corresponding to the frustums (11) are provided on the upper surface of the lower mold plate (2), and a lower mold cavity (22) adapted to the upper mold cavity (12) is provided on the side wall of the conical holes (21), characterized in that: The lower surface of the upper template (1) is lower than the highest point of the upper mold cavity (12), and a first frustum surface (13) is provided between the lower surface of the upper template (1) and the side wall of the upper mold cavity (12), and a second frustum surface (14) is provided between the lower end face of the frustum body (11) and the other side wall of the upper mold cavity (12); a third frustum surface (23) is provided between the upper surface of the lower template (2) and the side wall of the lower mold cavity (22), and a fourth frustum surface (24) is provided between the bottom surface of the conical hole (21) and the other side wall of the lower mold cavity (22), and the bottom surface of the conical hole (21) is higher than the lowest point of the lower mold cavity (22).

2. The O-ring mold with a 45-degree parting angle according to claim 1, characterized in that, After the upper template (1) and the lower template (2) are closed, the gap between the lower surface of the upper template (1) and the upper surface of the lower template (2) is greater than the gap between the first frustum surface (13) and the third frustum surface (23); the gap between the lower end face of the frustum body (11) and the bottom surface of the cone hole (21) is greater than the gap between the second frustum surface (14) and the fourth frustum surface (24).

3. The O-ring mold with a 45-degree parting line according to claim 1 or 2, characterized in that, The lower surface of the upper template (1) or the upper surface of the lower template (2) is provided with a first overflow groove (15) surrounding the frustum (11).

4. The O-ring mold with a 45-degree parting angle according to claim 1 or 2, characterized in that, The lower end face of the frustum (11) or the bottom surface of the conical hole (21) is provided with a second overflow groove (16) surrounding the central axis of the frustum (11).

5. The O-ring mold with a 45-degree parting angle according to claim 1 or 2, characterized in that, A positioning hole (17) is provided at the center of the lower surface of the upper template (1), and a rib (18) for circumferential positioning is provided on the side wall of the positioning hole (17). A positioning post (25) adapted to the positioning hole (17) is provided at the center of the upper surface of the lower template (2), and a limiting groove (26) adapted to the rib (18) is provided on the side wall of the positioning post (25).

6. The O-ring mold with a 45-degree parting angle according to claim 5, characterized in that, The positioning hole (17) and the positioning post (25) are both frustoconical structures. The rib (18) is a strip structure that is longitudinally distributed along the generatrix of the positioning hole (17) and has equal width at the top and bottom. The limiting groove (26) is a strip structure that is longitudinally distributed along the generatrix of the positioning post (25) and is narrow at the bottom and wide at the top. The width of the narrowest part of the limiting groove (26) is just enough to accommodate the rib (18).

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