A rubber ring forming die

Abstract

The application discloses a rubber ring forming die, which comprises an upper die assembly and a lower die assembly, and a plurality of cavities for rubber ring forming are formed after the upper die assembly and the lower die assembly are closed; a main runner and a branch runner are arranged in the upper die assembly, an annular material groove is arranged outside each cavity, the main runner is communicated with the annular material groove, and the branch runner sequentially connects each annular material groove; the annular material groove and the corresponding cavity are communicated through a feeding port, and the feeding port is arranged in a continuous closed whole circle shape around the outer periphery of the cavity, so that the rubber material can flow into the cavity through the feeding port from the whole peripheral direction of the cavity.

Description

Technical Field

[0001] This application relates to the field of rubber ring manufacturing technology, and more specifically to a rubber ring forming mold. Background Technology

[0002] In the molding and processing of rubber rings, such as O-rings, molds are the core equipment that determines product quality and production efficiency. In existing technologies, rubber ring molding molds typically include an upper mold assembly and a lower mold assembly. After the mold is closed, a cavity is formed for molding the rubber ring, and the rubber material is transported to the cavity through the gating system inside the mold to complete the molding process.

[0003] Traditional rubber ring molding dies generally employ a single-point feeding method, meaning the feed port connects to the cavity at a single location on the outer periphery, allowing the rubber material to flow unidirectionally into the cavity through this single feed port. However, this single-point feeding structure has significant shortcomings in actual production: Firstly, with single-point feeding, the concentrated injection of rubber material into the cavity from a single location results in a thicker sprue at the feed port. During trimming, operators find it difficult to precisely control the trimming force, easily leading to over-trimming or uneven force, causing damage or defects to the curved rubber edge. This severely affects the product's appearance quality and dimensional accuracy, reducing the finished product yield. Summary of the Invention

[0004] The purpose of this application is to provide a rubber ring forming mold to improve the stability of rubber ring forming while reducing the difficulty of rubber ring processing.

[0005] To achieve the above objectives, the technical solution adopted in this application is as follows: A rubber ring forming mold is provided, comprising: an upper mold assembly and a lower mold assembly. After the upper mold assembly and the lower mold assembly are closed, they form multiple cavities for rubber ring forming. The upper mold assembly has a main gating system and a runner. Each cavity has a corresponding annular material groove outside. The main gating system communicates with the annular material groove, and the runner connects each annular material groove in sequence. The annular material groove is connected to the corresponding cavity via a feed inlet. The feed inlet is arranged in a continuous closed loop around the outer periphery of the cavity, allowing the rubber material to flow into the cavity from the outer periphery of the cavity through the feed inlet throughout the entire circumferential direction.

[0006] As a preferred embodiment, the cross-section of the feed inlet is a slot structure of equal width.

[0007] As another preferred embodiment, the diversion channel includes a first diversion channel and a second diversion channel, so as to connect the first diversion channel and the annular trough through the second diversion channel.

[0008] Further preferably, multiple second diversion channels are provided, and the multiple second diversion channels are connected to a single annular trough.

[0009] Preferably, multiple second diversion channels are evenly spaced around the annular feed trough.

[0010] Further preferably, the upper mold assembly is provided with an air vent that communicates with the cavity.

[0011] In a further preferred embodiment, the first diversion channel is provided with an arc-shaped transition section at the corner position within the upper mold assembly.

[0012] Preferably, the cross-sectional area of ​​the annular material groove gradually decreases along the direction of the material flow, gradually shrinking and converging to form an inlet connected to the cavity.

[0013] Preferably, the rubber ring forming mold further includes a positioning member disposed between the upper mold assembly and the lower mold assembly, the positioning member being used to limit the relative displacement of the upper mold assembly and the lower mold assembly in the horizontal direction when the mold is closed.

[0014] Further preferably, the positioning component includes: multiple sets of limiting posts and limiting holes disposed at the corners of the rubber ring forming mold; specifically, the limiting holes are disposed on the upper mold assembly, and the corresponding limiting posts are disposed on the lower mold assembly; the positioning component further includes: multiple sets of first positioning holes and second positioning holes disposed at the corners of the rubber ring forming mold; specifically, the first positioning hole is disposed on the upper mold assembly, and the corresponding second positioning hole is disposed on the lower mold assembly; wherein, the first positioning hole is eccentrically disposed relative to the limiting hole, and the rubber ring forming mold is fixed and closed only when the upper mold assembly and the lower mold assembly are connected by the limiting post inserted into the limiting hole, and when the first positioning hole and the second positioning hole coincide.

[0015] Compared with the prior art, the beneficial effects of this application are as follows:

[0016] Between the cavity and the annular material channel, the inlet is not connected by a single point, but forms a closed channel without any breaks around the outer perimeter of the cavity. This allows the rubber material to flow into the cavity evenly and continuously from the full circumference of the cavity, realizing synchronous feeding of the rubber material in the entire outer perimeter of the cavity, and thus completing the entire feeding process of the rubber material.

[0017] Therefore, the whole-circle feeding allows the rubber material to flow in synchronously and evenly from the circumference of the cavity, and the distribution of the rubber material at the feed port is more dispersed, avoiding the problem of concentrated material flow in single-point feeding. At the same time, the thickness of the sprue formed by the whole-circle feeding is thinner and evenly distributed along the whole circle, without local thick sprue accumulation, reducing the burden of sprue handling from the source. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the structure of a rubber ring forming mold;

[0019] Figure 2This is a schematic diagram of the structure of the rubber ring forming mold from a top view.

[0020] Figure 3 for Figure 2 A cross-sectional view along the AA direction;

[0021] Figure 4 This is a magnified view of a portion of the rubber ring forming mold;

[0022] Figure 5 This is a magnified view of the cavity location.

[0023] Figure 6 This is an exploded view of the rubber ring forming mold and the intermediate parts being formed.

[0024] Figure 7 This is a schematic diagram of the upper mold assembly;

[0025] Figure 8 This is a structural diagram of the middleware;

[0026] Figure 9 This is a schematic diagram of the rubber ring structure.

[0027] In the diagram: 1. Rubber ring forming mold; 2. Rubber ring; 3. Intermediate component; 10. Upper mold assembly; 20. Lower mold assembly; 30. Cavity; 40. Main runner; 50. Runner; 51. First runner; 511. Arc-shaped transition section; 52. Second runner; 60. Sprue; 70. Annular groove; 71. Inlet; 80. Positioning component; 81. Limiting post; 82. Limiting hole; 83. First positioning hole; 84. Second positioning hole; 90. Air vent. Detailed Implementation

[0028] The present application will be further described below with reference to specific embodiments. It should be noted that, without conflict, the various embodiments or technical features described below can be arbitrarily combined to form new embodiments.

[0029] In the description of this application, it should be noted that the directional terms such as "center", "lateral", "longitudinal", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", and "counterclockwise" indicate the orientation and positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description, and 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. They should not be construed as limiting the specific protection scope of this application.

[0030] It should be noted that the terms "first," "second," etc., in the specification and claims of this application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence.

[0031] The terms “comprising” and “having”, and any variations thereof, in the specification and claims of this application are intended to cover non-exclusive inclusion, for example, a process, method, system, product, or device that includes a series of steps or units is not necessarily limited to those steps or units that are explicitly listed, but may include other steps or units that are not explicitly listed or that are inherent to such process, method, product, or device.

[0032] In one specific implementation, see Figures 1 to 9 A rubber ring forming mold 1 is provided, including: an upper mold assembly 10 and a lower mold assembly 20. After the upper mold assembly 10 and the lower mold assembly 20 are closed, they form a plurality of cavities 30 for forming rubber rings 2. The upper mold assembly 10 is provided with a main runner 40 and a branch runner 50. Each cavity 30 is provided with an annular material groove 70. The main runner 40 is connected to the annular material groove 70. The branch runner 50 connects each annular material groove 70 in sequence. The annular material groove 70 is connected to the corresponding cavity 30 through a feed port 71. The feed port 71 is arranged in a continuous closed ring around the outer periphery of the cavity 30 so that the rubber material can flow into the cavity 30 from the outer periphery of the cavity 30 through the feed port 71 in the entire surrounding direction.

[0033] Among them, the rubber ring 2 is an O-ring 2, which is formed by molding rubber material in the cavity 30. The vulcanization process of the rubber ring 2 will not be described here. The annular groove 70 is set around the outer circumference and inner periphery of the cavity 30 of the O-ring to ensure sufficient space for overflow during the molding process of the O-ring 2, so as to avoid incomplete molding of the O-ring 2. In this application, the rubber material of the main runner 40 first directly enters the annular groove 70 on the outer circumference of the cavity 30. The rubber material fills the cavity 30 through the inlet 71 between the annular groove 70 and the cavity 30. That is, in the O-ring molding mold 1, the inlet 71 is set as a continuous closed complete annular structure along the outer circumference of the cavity 30. Specifically, the inlet 71 between the cavity 30 and the annular groove 70 is not only connected by a single point, but forms a closed channel without breaks around the outer circumference of the cavity 30, so that the rubber material can flow into the cavity 30 evenly and continuously from the full circumference of the outer circumference of the cavity 30, realizing the synchronous feeding of the rubber material in the entire outer circumference of the cavity 30, and thus completing the whole circle feeding process of the rubber material.

[0034] Therefore, the whole-circle feeding allows the rubber material to flow synchronously and evenly from the 30-circle direction of the cavity. The distribution of the rubber material at the feed inlet 71 is more dispersed, avoiding the problem of concentrated material flow in single-point feeding. At the same time, the thickness of the material head formed by the whole-circle feeding is thinner and evenly distributed along the whole circle, without local thick material head accumulation, reducing the burden of material head processing from the source.

[0035] The cross-section of the feed inlet 71 is a slit structure of equal width, and preferably, the thickness X1 of the feed inlet 71 is 0.05 mm. Since the material head is evenly distributed along the whole circle and is thin, it can be operated smoothly along the whole circle during trimming. There is no need to forcefully trim the thick material head, which reduces the generation of thick material head. The trimming process is simpler and less time-consuming. At the same time, it reduces the risk of tearing or accidentally cutting the arc-shaped rubber edge during the trimming process, and greatly improves the trimming qualification rate.

[0036] The rubber ring forming mold 1 in this application includes cavities 30 of various sizes. Specifically, one side has small cavities 30 capable of simultaneously forming eight small rubber rings 2, and the other side has large cavities 30 capable of forming two large rubber rings 2, so as to achieve partitioned forming of rubber rings 2 of different sizes. The flow channel 50 includes a first flow channel 51 and a second flow channel 52, so that the first flow channel 51 and the annular material groove 70 are connected through the second flow channel 52. See also... Figure 7 Multiple second sub-channels 52 are provided, and these multiple second sub-channels 52 are connected to a single annular trough 70. After the rubber material in the main gating 40 enters the annular trough 70, since the annular trough 70 is connected to the second sub-channels 52, the rubber material can enter a portion of the second sub-channels 52 near the main gating 40 from the annular trough 70. Through this portion of the second sub-channels 52, the rubber material is driven into the first sub-channel 51. Through the series connection of the first sub-channels 51, the rubber material in the second sub-channels 52 at the far end of the main gating 40 is replenished in a cyclical manner, thereby achieving multi-angle feeding of the annular trough 70 so that the annular trough 70 can evenly fill the cavity 30 with the rubber material through the inlet 71.

[0037] Multiple second distribution channels 52 are evenly spaced around the annular material trough 70. The evenly spaced second distribution channels 52 can simultaneously deliver the adhesive to the annular material trough 70 from multiple directions, avoiding problems such as local adhesive accumulation, excessively high pressure, or insufficient supply and low pressure in the annular material trough 70 caused by a single or non-uniformly distributed distribution channel 50. The adhesive pressure in the annular material trough 70 tends to be uniform, which can provide a stable pressure foundation for subsequent supply of material to the cavity 30 through the full-circle inlet 71, ensuring the uniformity of the flow rate and flow of adhesive when it flows into the cavity 30 from the outer periphery, reducing filling defects in the cavity 30 caused by local pressure differences, and further improving the filling rate of adhesive in the cavity 30.

[0038] Further preferred, the first branch channel 51 is provided with an arc-shaped transition section 511 at the corner position within the upper mold assembly 10. Since the first branch channel 51 is the connecting hub, the traditional right-angle or acute-angle corner structure will cause the rubber material to encounter significant resistance when flowing through the corner. However, the smooth curve structure of the arc-shaped transition section 511 in the first branch channel 51 in this application can effectively guide the rubber material to change its flow direction smoothly, avoiding dead zones and eddies at right-angle corners. This allows the rubber material to flow more smoothly through the corners to each of the second branch channels 52, ensuring that the rubber material is delivered to the subsequent annular groove 70 and cavity 30 with more stable pressure, thus ensuring filling efficiency.

[0039] To elaborate further, see Figures 2 to 5 In this application, the upper mold assembly 10 has four sprues 60, which are connected by an X-shaped passage. This eliminates the need for individual material filling for each sprue 60, and the passage has a certain inclination to facilitate the entry of the material into the sprues 60, preventing the material from accumulating in the X-shaped passage. At the same time, the X-shaped passage has a natural symmetrical distribution characteristic, with the four sprues 60 located at the four ends of the X-shaped passage. After the material enters the center of the X-shaped passage, it can be evenly distributed to the four sprues 60 through the symmetrical passage structure. This symmetrical design ensures that the amount, pressure, and flow rate of material obtained by each sprue 60 are basically the same, avoiding the problem of excessive or insufficient local material supply caused by uneven distribution of the sprues 60 or asymmetrical passage structure, thus laying the foundation for the uniform filling of the subsequent annular grooves 70 and cavities 30.

[0040] Meanwhile, the main runner 40 is wider at the top and narrower at the bottom along the vertical flow direction. This structure conforms to the flow characteristics of the rubber material. The wider inlet at the top can more smoothly receive the rubber material injected from the injection molding machine nozzle, reducing the initial resistance and impact loss when the rubber material enters the mold. As the vertical flow direction gradually narrows, the flow velocity of the rubber material in the main runner 40 gradually increases, and the pressure is effectively accumulated and transmitted downwards, providing a stable initial force for the subsequent rubber material to enter the branch runner 50 and the annular trough 70, avoiding problems such as rubber material retention or insufficient supply caused by the narrow inlet. The first branch runner 51 and the second branch runner 52 form a grid structure, which can divert the rubber material conveyed by the main runner 40 from the center to the surrounding annular troughs 70 in multiple directions and along multiple paths.

[0041] Preferably, the cross-sectional area of ​​the annular material channel 70 gradually decreases along the direction of material flow, gradually narrowing and converging to form the inlet 71 connected to the cavity 30. This provides a converging effect on the material, ensuring that the material maintains a uniform convergence trend in the circumferential direction of the annular material channel 70. This avoids local accumulation or flow rate differences of the material in the channel, ensuring that the material supply and pressure at each point at the inlet 71 remain consistent, and further guaranteeing the uniformity of the entire feeding process.

[0042] Preferably, the rubber ring forming mold 1 further includes a positioning member 80 disposed between the upper mold assembly 10 and the lower mold assembly 20. The positioning member 80 is used to limit the relative displacement of the upper mold assembly 10 and the lower mold assembly 20 in the horizontal direction when the mold is closed.

[0043] Further preferably, the positioning component 80 includes: multiple sets of limiting posts 81 and limiting holes 82 located at the corners of the rubber ring forming mold 1. Specifically, the limiting holes 82 are located in the upper mold assembly 10, and the corresponding limiting posts 81 are located in the lower mold assembly 20. The positioning component 80 also includes: multiple sets of first positioning holes 83 and second positioning holes 84 located at the corners of the rubber ring forming mold 1. Specifically, the first positioning holes 83 are located in the upper mold assembly 10, and the corresponding second positioning holes 84 are located in the lower mold assembly 20. The first positioning holes 83 are eccentrically positioned relative to the limiting holes 82. The rubber ring forming mold 1 is fixed and closed when the upper mold assembly 10 and the lower mold assembly 20 are connected by the limiting posts 81 inserted into the limiting holes 82, and when the first positioning holes 83 and the second positioning holes 84 coincide.

[0044] Specifically, the upper mold assembly 10 and the lower mold assembly 20 in this application are square structures with four corners. Therefore, a set of limiting posts 81 and limiting holes 82, as well as a set of first positioning holes 83 and second positioning holes 84 are provided at each corner. The first positioning hole 83 on the lower left and the first positioning hole 83 on the lower right are closer to the center line than the limiting holes 82 on the lower left and the lower right. This achieves the eccentric setting of the first positioning hole 83 relative to the limiting holes 82. When the upper mold assembly 10 is rotated 90 degrees, the first positioning hole 83 and the second positioning hole 84 at the upper and lower mold positions cannot be aligned, thus achieving a certain effect of avoiding mold closing misalignment.

[0045] Therefore, in order to avoid a 180-degree misalignment between the upper and lower molds during mold closing, a foolproof notch can be added to one side of the upper mold assembly 10 and the lower mold assembly 20 to indicate to the operator whether the mold is misaligned during mold closing.

[0046] The upper mold assembly 10 is provided with an air port 90 that connects to the cavity 30. The air port 90 is located around the upper mold assembly 10 to facilitate the discharge of gas from the gating system and cavity 30 during the flow of the rubber material, thereby preventing the formation of air bubbles and pores in the rubber ring 2.

[0047] Furthermore, in the process of completing the molding of the rubber ring 2, the rubber material is first injected into the main sprue 40 in the upper mold assembly 10, and the rubber material is transferred downward in the main sprue 40; the rubber material in the main sprue 40 directly enters the annular groove 70 on the outer circumference of the cavity 30, the main sprue 40 and the annular groove 70 are connected, and at the same time, the runners 50 connect each annular groove 70 in sequence. The runners 50 include a first runner 51 and a second runner 52, and the first runner 51 and the annular groove 70 are connected through the second runner 52.

[0048] After the rubber material enters the annular trough 70, since the annular trough 70 is connected to the second branch channel 52, the rubber material enters the second branch channel 52 near the main gating 40 from the annular trough 70. The rubber material is then carried into the first branch channel 51 through the second branch channel 52. Through the series connection of the first branch channel 51, the rubber material in the second branch channel 52 at the far end of the main gating 40 is replenished in a cyclical manner, realizing multi-angle feeding of the annular trough 70. Moreover, multiple second branch channels 52 are connected to a single annular trough 70, further ensuring the uniformity of the rubber material supply in the annular trough 70.

[0049] See Figure 5 The cross-sectional area of ​​the annular material groove 70 gradually decreases along the direction of the material flow, gradually shrinks and converges, and the material flows and converges in the annular material groove 70 to the inlet 71 connected to the cavity 30; the material flows into the cavity 30 from the outer periphery of the cavity 30 through the inlet 71, realizing full-circle feeding.

[0050] The rubber material is formed in multiple cavities 30 formed by the upper mold assembly 10 and the lower mold assembly 20 after they are closed, forming an intermediate part 3. After the intermediate part 3 is flashed, a complete O-ring 2 is obtained.

[0051] The basic principles, main features, and advantages of this application have been described above. Those skilled in the art should understand that this application is not limited to the above embodiments. The embodiments and descriptions in the specification are merely the principles of this application. Various changes and modifications can be made to this application without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claims. The scope of protection claimed by this application is defined by the appended claims and their equivalents.

Claims

1. A rubber ring forming mold, characterized in that, include: The upper mold assembly and the lower mold assembly, after being closed, form multiple cavities for forming rubber rings; The upper mold assembly has a main runner and a branch runner, and each cavity has a corresponding annular material groove. The main runner is connected to the annular material groove, and the branch runner connects each annular material groove in sequence. The annular material groove is connected to the corresponding cavity through a feed port. The feed port is arranged in a continuous closed ring around the outer periphery of the cavity, so that the adhesive can flow into the cavity from the outer periphery of the cavity through the feed port in the entire surrounding direction.

2. The rubber ring forming mold as described in claim 1, characterized in that, The cross-section of the feed inlet is a slot structure of equal width.

3. The rubber ring forming mold as described in claim 1, characterized in that, The diversion channel includes a first diversion channel and a second diversion channel, so as to connect the first diversion channel and the annular material trough through the second diversion channel.

4. The rubber ring forming mold as described in claim 3, characterized in that, The second diversion channel is provided in multiple ways, and the multiple second diversion channels are connected to a single annular trough.

5. The rubber ring forming mold as described in claim 4, characterized in that, Multiple second diversion channels are evenly spaced around the annular feed trough.

6. The rubber ring forming mold as described in claim 1, characterized in that, The upper mold assembly is provided with an air vent that connects to the cavity.

7. The rubber ring forming mold as described in claim 3, characterized in that, The first flow channel is located at a corner position within the upper mold assembly and has an arc-shaped transition section.

8. The rubber ring forming mold as described in claim 2, characterized in that, The cross-sectional area of ​​the annular material trough gradually decreases along the direction of material flow, gradually shrinking and converging to form an inlet connected to the cavity.

9. The rubber ring forming mold as described in any one of claims 1-8, characterized in that, It also includes a positioning element disposed between the upper mold assembly and the lower mold assembly, the positioning element being used to limit the relative displacement of the upper mold assembly and the lower mold assembly in the horizontal direction when the mold is closed.

10. The rubber ring forming mold as described in claim 9, characterized in that, The positioning element includes: Multiple sets of limiting posts and limiting holes are provided at the corners of the rubber ring forming mold. Specifically, the limiting holes are provided in the upper mold assembly, and the limiting posts are provided in the lower mold assembly. The positioning element also includes: Multiple sets of first positioning holes and second positioning holes are provided at the corners of the rubber ring forming mold. Specifically, the first positioning hole is provided in the upper mold assembly, and the corresponding second positioning hole is provided in the lower mold assembly. The first positioning hole is eccentrically positioned relative to the limiting hole. The rubber ring forming mold completes the fixed mold closing when the upper mold assembly and the lower mold assembly are inserted into the limiting hole through the limiting post, and when the first positioning hole coincides with the second positioning hole.

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