Cold runner injection sealing ring mold

Abstract

The utility model discloses a cold runner injection sealing ring mould which comprises an upper mould and a lower mould, cavities are formed between the upper mould and the lower mould, the upper mould is provided with a material injection through hole, the lower mould is provided with a material injection groove which is opposite to and communicated with the material injection hole, the material injection groove and the material injection through hole form a material injection hole, a plurality of groups of cavities are arranged, and the cavity is communicated with the material injection through hole. The multiple groups of cavities are distributed on the outer side of the injection hole in the circumferential direction; a plurality of groups of cavities are formed in the upper die and the lower die, a buffer channel is arranged on the outer side of each group of cavities, feeding intervals are formed between the buffer channels and the cavities, feeding channels for communicating the cavities with the buffer channels are formed in each group of feeding intervals, and the bottoms of the feeding channels are lower than the separation surface of the upper die and the lower die; and a runner for communicating the buffer channel with the material injection hole is also arranged between the buffer channel and the material injection hole. According to the cold runner injection sealing ring mold provided by the utility model, the production efficiency is increased while the product quality is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of rubber part molds, in particular to a cold runner injection seal ring mold. Background Technique

[0002] Cold runner injection is a kind of injection process for rubber product production. The cold runner is relative to the traditional high-temperature die pressing. The cold runner system controls the temperature of the rubber compound in the runner and the gate through a certain medium (usually oil), and this temperature is usually 50-70°C, so that it always remains below the vulcanization temperature before entering the mold cavity, having good plasticity and not causing vulcanization.

[0003] The injection point structure of the existing cold runner molds for seal rings is mostly a single injection point structure. As Figure 1 shown, for the seal ring with a circular structure, the product qualification rate is relatively low, the quality is poor, and the production efficiency is slow. Therefore, improving the above technical problems by adopting the structure of multiple injection points is not obvious. Content of the Utility Model

[0004] To solve the technical problems in the background technique, the utility model proposes a cold runner injection seal ring mold.

[0005] A cold runner injection seal ring mold proposed by the utility model includes an upper mold and a lower mold. A cavity is formed between the upper mold and the lower mold. A material injection through hole is opened on the upper mold, and a material injection groove opposite to and communicated with the material injection through hole is opened on the lower mold. The material injection groove and the material injection through hole form a material injection hole. There are multiple groups of the cavities, and the multiple groups of cavities are circumferentially distributed outside the material injection hole;

[0006] A buffer channel is arranged outside each group of the cavities. An inlet interval is formed between the buffer channel and the cavity. An inlet channel for communicating the cavity and the buffer channel is opened on each inlet interval, and the bottom of the inlet channel is lower than the separation surface of the upper mold and the lower mold;

[0007] A runner for communicating the buffer channel and the material injection hole is further arranged between the buffer channel and the material injection hole.

[0008] The utility model changes from the original injection point feeding to the current surface feeding (realizing surface feeding through the buffer channel and the feeding groove), thereby ensuring that the feeding is wide enough, the flow range is large, the runner is thinner, reducing the unit consumption, and the flash can be removed by freezing without modification, saving the subsequent processes. While improving the product quality, the production efficiency is increased.

[0009] Preferably, the flow channel includes a first flow channel and a second flow channel that are interconnected. One end of the first flow channel is connected to the injection hole, the other end of the first flow channel is connected to the second flow channel, the second flow channel is connected to the buffer channel, and the aperture of the second flow channel is smaller than that of the second flow channel. It is further convenient for feeding and improves the product quality.

[0010] Preferably, there is a transition flow channel between the first flow channel and the second flow channel, and the depth of the transition flow channel gradually decreases from the end close to the first flow channel to the end close to the second flow channel.

[0011] Preferably, the depth of the buffer channel is greater than the radius of the second flow channel.

[0012] Preferably, a connecting channel is provided between the buffer channel and the flow channel. The width of the connecting channel is smaller than the outer diameter of the flow channel and smaller than the length of the buffer channel, and the depth of the buffer channel is smaller than the depth of the flow channel.

[0013] Preferably, a feed point groove is opened at the bottom of the feed channel. The feed point groove connects the cavity with the buffer channel.

[0014] Preferably, there are multiple feed point grooves, and the multiple feed point grooves are distributed along the length direction of the feed channel, and an interval is formed between any two adjacent feed point grooves.

[0015] Preferably, an exhaust channel is provided on the outer side of the cavity, and the exhaust channel is connected to the cavity.

[0016] Preferably, an exhaust groove is provided between the exhaust channel and the cavity, and the depth of the exhaust groove is smaller than the depth of the exhaust channel.

[0017] Preferably, the exhaust channel is opposite to the buffer channel.

[0018] Preferably, an overflow groove is opened on the upper mold. The top of the overflow groove is located above the top of the cavity. The exhaust channel is connected to the overflow groove, and the exhaust channel is opened on the upper mold. Moreover, the cavity, the injection hole, the feed channel, and the buffer channel all have parts located on the upper mold and parts located on the lower mold.

[0019] In the present utility model, the proposed cold runner injection sealing ring mold changes from the original injection point feeding to the current surface feeding, ensuring a sufficiently wide feeding area, a large flow range, a thinner flow channel, reducing the unit consumption, and can remove flash by freezing without modification, saving the subsequent processes. While improving the product quality, the production efficiency is increased.

[0020] Additional aspects and advantages of the present utility model will be given in part in the following description, become apparent in part from the following description, or be learned through the practice of the present utility model. Description of the Drawings

[0021] Figure 1 It is a schematic injection diagram of a cold runner mold in the prior art;

[0022] Figure 2 It is a schematic structural diagram of the present utility model;

[0023] Figure 3 It is a sectional view of the cavity and runner part of the present utility model;

[0024] Figure 4 It is a schematic structural diagram of the upper mold of the present utility model;

[0025] Figure 5 It is a partial enlarged view of area A of the present utility model;

[0026] Figure 6 It is a schematic diagram of the partial structure of area B of the present utility model;

[0027] Figure 7 It is a schematic structural diagram of the lower mold of the present utility model;

[0028] Figure 8 It is a schematic diagram of the partial structure of area C of the present utility model;

[0029] In the figure: 1. Upper mold; 10. Upper mold cavity; 11. Injection through hole; 12. Upper buffer groove; 13. Upper feed groove; 14. Upper flow-through groove; 15. Upper connection groove; 2. Lower mold; 20. Lower mold cavity; 21. Injection groove; 22. Lower buffer groove; 23. Lower feed groove; 24. Lower flow-through groove; 25. Lower connection groove; 3. Cavity; 4. Buffer channel; 5. Feed channel; 6. Runner; 60. First runner; 61. Second runner; 62. Transition runner; 7. Connection channel; 9. Exhaust channel; 16. Exhaust groove; 17. Overflow groove. Detailed Embodiment

[0030] Embodiments of the present utility model will be described in detail below. Examples of the embodiments are shown in the drawings, where the same or similar symbols represent the same or similar elements or elements with the same or similar functions throughout. The embodiments described below with reference to the drawings are exemplary and are only used to explain the present utility model and should not be construed as limiting the present utility model.

[0031] As Figures 2 - 8A cold runner injection sealing ring mold shown, comprising an upper mold 1 and a lower mold 2. A cavity 3 is formed between the upper mold 1 and the lower mold 2. Specifically, as in the prior art, an upper mold cavity 10 is formed on the upper mold 1, and a lower mold cavity 20 is formed on the lower mold 2. The upper mold cavity 10 and the lower mold cavity 20 form the cavity 3. A material injection through hole 11 is formed on the upper mold 1, and a material injection groove 21 (the material injection groove 21 is a blind hole) opposite to and communicating with the material injection through hole is formed on the lower mold 2. The outer diameter of the material injection groove 21 is equal to and coaxial with the outer diameter of the material injection through hole 11. The material injection groove 21 and the material injection through hole 11 form a material injection hole. There are multiple groups of cavities 3, and the multiple groups of cavities 3 are circumferentially distributed outside the material injection hole;

[0032] On the outer side of each group of cavities 3 and close to one side of the material injection hole, a buffer channel 4 is provided. Specifically, an upper buffer groove 12 is formed on the upper mold 1, and a lower buffer groove 22 is formed on the lower mold 2. The upper buffer groove 12 and the lower buffer groove 22 are opposite to each other and form the buffer channel 4. An inlet interval is formed between the buffer channel 4 and the cavity 3. On each inlet interval, a feed channel 5 for communicating the cavity 3 and the buffer channel 4 is formed. The depth of the feed channel 5 is lower than the depth of the buffer channel 4 and also lower than the depth of the cavity 3. Specifically, an upper feed groove 13 is formed on the upper mold 1, and a lower feed groove 23 is formed on the lower mold 2. The lower feed groove 23 and the upper feed groove 13 are opposite to each other and form the feed channel 5. The aperture of the feed channel 5 is 0.08 mm;

[0033] A runner 6 for communicating the buffer channel 4 and the material injection hole is further provided between the buffer channel 4 and the material injection hole.

[0034] During the material injection process, the material is discharged to the runner 6 through the material injection hole and then enters the buffer channel 4. The material in the buffer channel 4 enters the cavity 3 through the feed channel 5, thereby ensuring that the inlet is wide enough, the flow rate range is large, and the uniform feeding is ensured through the structure of the buffer channel 4. The runner 6 is thinner, reducing the unit consumption, and the flash can be removed by freezing without modification, saving the subsequent processes. While improving the product quality, the production efficiency is increased.

[0035] Preferably, an upper flow-through groove 14 is formed on the upper mold 1 plate, and a lower flow-through groove 24 is formed on the lower mold 2 plate. The lower flow-through groove 24 and the upper flow-through groove 14 are opposite to each other and form the runner 6. The runner 6 includes a first runner 60 and a second runner 61 that are interconnected. One end of the first runner 60 is connected to the material injection hole, the other end of the first runner 60 is connected to the second runner 61, and the second runner 61 is connected to the buffer channel 4. The aperture of the second runner 61 is smaller than the aperture of the second runner 61. It is further convenient for feeding and improves the product quality.

[0036] To further improve the product quality, preferably, there is a transition channel 62 between the first channel 60 and the second channel 61. The depth of the transition channel 62 gradually decreases from the end close to the first channel 60 to the end close to the second channel 61, that is, the transition channel 62 is conical, which further improves the product quality. Preferably, the depth of the buffer channel 4 is greater than the radius of the second channel 61. Optionally, the outer diameter of the first channel 60 is controlled at about 1.5 mm, and the outer diameter of the second channel 61 is controlled at about 0.7 mm. The aperture of the buffer channel 4 is smaller than the outer diameter of the first channel 60 and smaller than the aperture of the first channel 60.

[0037] To further increase the product quality and facilitate the tearing of the edge, preferably, there is a connecting channel 7 between the buffer channel 4 and the channel 6. The width of the connecting channel 7 is smaller than the outer diameter of the channel 6 and smaller than the length of the buffer channel 4. The depth of the buffer channel 4 is smaller than the depth of the second channel 61. Specifically, an upper connecting groove 15 is formed on the upper mold 1, and a lower connecting groove 25 is formed on the lower mold 2. The upper connecting groove 15 and the lower connecting groove 25 form the connecting channel 7.

[0038] To further increase the product quality, preferably, a feeding point groove is formed at the bottom of the feeding channel 5. The feeding point groove connects the cavity 3 and the buffer channel 4. It is found through experiments that the setting of the feeding point groove does not affect the tearing of the edge.

[0039] Those skilled in the art can select optionally according to the flow rate requirements. The feeding point groove has multiple ones, and the multiple feeding point grooves are distributed along the length direction of the feeding channel 5. An interval is formed between any two adjacent feeding point grooves, and the setting of the interval facilitates the tearing of the edge.

[0040] To further improve the quality and qualification rate of the sealing ring, preferably, an exhaust channel 9 is provided outside the cavity 3. The exhaust channel 9 is communicated with the cavity 3. The aperture of the exhaust channel 9 is controlled at about 0.08 mm, and the depth of the exhaust channel 9 is the same as the depth of the feeding channel 5.

[0041] To further improve the product quality and reduce material waste, preferably, an exhaust groove 16 is provided between the exhaust channel 9 and the cavity 3. The depth of the exhaust groove 16 is smaller than the depth of the exhaust channel 9.

[0042] To further improve the product quality, preferably, the exhaust channel 9 is opposite to the buffer channel 4.

[0043] Preferably, an overflow groove 17 is formed on the upper mold 1. The top surface of the overflow groove 17 is above the top surface of the cavity 3. The exhaust channel 9 is communicated with the overflow groove 17, and the exhaust channel 9 is formed on the upper mold 1. And the exhaust groove 16 has a part formed on the upper mold 1 and also has a part formed on the lower mold 2. And the cavity 3, the injection hole, the feeding channel 5 and the buffer channel 4 all have parts located on the upper mold 1 and also have parts located on the lower mold 2, which reduces the waste of materials while ensuring the exhaust effect.

[0044] It should be understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present invention.

[0045] In addition, the terms "first" and "second" are only used for descriptive purposes and should not be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include at least one of such features. In the description of the present invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise specifically defined.

[0046] In the present invention, unless otherwise clearly specified and defined, the terms such as "mounted", "connected", "coupled", "fixed", etc. shall be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or integrated; it may be a mechanical connection, an electrical connection or communication with each other; it may be directly connected, or indirectly connected through an intermediate medium, and may be the internal communication of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0047] In the present invention, unless otherwise clearly specified and defined, the first feature being "on" or "under" the second feature may be that the first and second features are in direct contact, or the first and second features are indirectly in contact through an intermediate medium. Moreover, the first feature being "above", "over" and "on top of" the second feature may be that the first feature is directly above or obliquely above the second feature, or merely indicates that the first feature has a higher horizontal height than the second feature. The first feature being "under", "beneath" and "underneath" the second feature may be that the first feature is directly below or obliquely below the second feature, or merely indicates that the first feature has a lower horizontal height than the second feature.

[0048] The above is only a preferred specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present invention, according to the technical solution and inventive concept of the present invention, makes equivalent substitutions or changes, and should be covered by the protection scope of the present invention.

Claims

1. A cold runner injection sealing ring mold, comprising an upper mold (1) and a lower mold (2), wherein a cavity (3) is formed between the upper mold (1) and the lower mold (2), and characterized in that: The upper mold (1) is provided with an injection hole (11), the lower mold (2) is provided with an injection groove (21) opposite to and connected to the injection hole (11), the injection groove (21) and the injection hole (11) form an injection hole, and a plurality of groups of cavities (3) are circumferentially distributed outside the injection hole; A buffer channel (4) is provided on the outer side of each group of the cavities (3), a feed interval is formed between the buffer channel (4) and the cavities (3), and a feed channel (5) is opened on each group of the feed interval for connecting the cavities (3) and the buffer channel (4); A flow channel (6) for connecting the buffer channel (4) and the injection hole is also provided between the buffer channel (4) and the injection hole.

2. The cold runner injection sealing ring mold according to claim 1, characterized in that: The flow channel (6) comprises a first flow channel (60) and a second flow channel (61) which are interconnected, one end of the first flow channel (60) is connected to the injection hole, the other end of the first flow channel (60) is connected to the second flow channel (61), the second flow channel (61) is connected to the buffer channel (4), and the aperture of the second flow channel (61) is smaller than the aperture of the second flow channel (61).

3. The cold runner injection sealing ring mold according to claim 2, characterized in that: A transition channel (62) is provided between the first channel (60) and the second channel (61), and a depth of the transition channel (62) gradually decreases from an end close to the first channel (60) to an end close to the second channel (61).

4. The cold runner injection sealing ring mold according to claim 3, characterized in that: The depth of the buffer channel (4) is greater than the radius of the second flow channel (61).

5. The cold runner injection sealing ring mold according to claim 4, characterized in that: A connecting channel (7) is provided between the buffer channel (4) and the flow channel (6); the width of the connecting channel (7) is smaller than the outer diameter of the flow channel (6) and smaller than the length of the buffer channel (4); and the depth of the buffer channel (4) is smaller than the depth of the flow channel (6).

6. The cold runner injection sealing ring mold according to claim 1, characterized in that: A feeding point groove is formed at the bottom of the feeding channel (5), and the feeding point groove connects the mold cavity (3) with the buffer channel (4).

7. The cold runner injection sealing ring mold according to claim 6, characterized in that: There are a plurality of feed point slots, and the plurality of feed point slots are distributed along the length direction of the feed channel (5), and a gap is formed between any two adjacent feed point slots.

8. The cold runner injection sealing ring mold according to any one of claims 1 to 7, characterized in that: An exhaust passage (9) outside the mold cavity (3), wherein the exhaust passage (9) is in communication with the mold cavity (3).

9. The cold runner injection sealing ring mold according to claim 8, characterized in that: An exhaust groove (16) is provided between the exhaust channel (9) and the mold cavity (3), and the depth of the exhaust groove (16) is smaller than the depth of the exhaust channel (9).

10. The cold runner injection sealing ring mold according to claim 8, characterized in that: The exhaust channel (9) is opposite to the buffer channel (4).

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