A cold runner injection mold for mass producing a rotary body rubber seal

Abstract

This utility model provides a cold runner injection mold for mass production of rotating rubber seals. The mold body has N main mold cavities, each with a main injection port in the center. Each main injection port has four main runners symmetrically arranged around its periphery, and each main runner has four branch runners symmetrically extending around its tail end. Each branch runner corresponds to a single mold cavity. The main runners and branch runners are all distributed in an "I" shape. All main runners and branch runners are of equal length, and all runners have rounded transitions at their junctions. This effectively reduces the flow resistance of the rubber material, making the flow smoother. When mass-producing rotating seals with complex structures, the product quality is better, the precision is higher, and the defect rate is lower.

Description

Technical Field

[0001] This utility model relates to the production and processing of rubber seals, and more particularly to a cold runner injection mold for mass production of rotating rubber seals. Background Technology

[0002] Rubber seals are common sealing parts in modern industrial equipment, and skeleton oil seals are one of the important products used to isolate lubricated components in transmission parts from the external environment to prevent lubricant leakage. With the rapid development of industry, people have increasingly higher requirements for the application and quality of rubber sealing products. Rubber seals produced by traditional flat molding vulcanization molds are insufficient to guarantee the quality requirements of these applications, and rubber injection vulcanization technology is gradually replacing flat molding vulcanization technology.

[0003] Cold runner rubber injection molding technology can improve the utilization rate of rubber compounds and enhance the quality and performance of rubber products. However, it is not suitable for manufacturing complex rubber seals with composite sealing rotating body structures, such as automotive skeleton oil seals (see...). Figure 1 In mass injection production, complex molds and poor runner design can easily lead to problems such as poor precision, air bubbles, burrs, and weak adhesion to the metal skeleton material in rubber seals. Therefore, it is necessary to redesign cold runner injection molds for complex rubber seals to enable mass production of high-quality products. Summary of the Invention

[0004] This utility model proposes a cold runner injection mold for mass production of rotating rubber seals, which addresses the problems of poor product precision, air bubbles, burrs, and weak adhesion to the metal skeleton material caused by complex molds and unreasonable runner design when mass-producing rubber seals with complex structures.

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] A cold runner injection mold for mass production of rotating rubber seals includes a mold body and N main mold cavities located on the mold body, where N > 1 and is a natural number; each mold cavity has a main injection port in the center, each main injection port has 4 main runners symmetrically arranged around its periphery, and each main runner has 4 branch runners symmetrically extended around its tail end, each branch runner corresponding to a single mold cavity, and the mold body has a total of 4*4*N single mold cavities. The main runners and branch runners are all distributed in an "I" shape, all main runners are of equal length, all branch runners are of equal length, and all intersections between runners are rounded transition structures.

[0007] Preferably, the width of the main channel is 5mm and the depth is 2.5mm.

[0008] Preferably, the width of the branch channel is 3mm and the depth is 2.5mm.

[0009] Preferably, the mold body has 8 main mold cavities, and the 8 main mold cavities are symmetrically distributed in a rectangular shape.

[0010] Preferably, the injection port of each individual mold cavity is located at the center of the top surface of the larger diameter end of the produced rubber rotary seal.

[0011] Preferably, the injection port of the single mold cavity is circular.

[0012] Preferably, the injection port diameter of the single mold cavity is 0.05-0.1 mm and the height is 0.2-0.4 mm.

[0013] Preferably, the mold body is composed of multiple templates made of P20H mold steel.

[0014] Compared with the prior art, the beneficial effects of this utility model are as follows: the arrangement of the mold cavity is redesigned, and the structure of the main runner and branch runner is redesigned, so that dozens or even more than a hundred rotating rubber seals can be produced simultaneously on one injection mold. The main mold cavity and the individual mold cavity, as well as the main runner and the branch runner, are symmetrically and evenly arranged, with equal runner lengths. The intersections of each runner are all rounded, which effectively reduces the flow resistance of the rubber material and makes the rubber flow smoother. When mass-producing rotating seals with complex structures, the product quality is better, the precision is higher, and the defect rate is lower. Attached Figure Description

[0015] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0016] Figure 1 This is a schematic diagram of the structure of a rotating rubber seal for mass production using a cold runner injection mold according to this utility model;

[0017] Figure 2 A schematic diagram of the overall structure of a cold runner injection mold for mass production of rotating rubber seals;

[0018] Figure 3 A schematic diagram of the flow channel structure of the main mold cavity.

[0019] The mold body consists of 1, main mold cavity 2, injection port 3, main runner 4, branch runner 5, and individual mold cavity 6. Detailed Implementation

[0020] To provide a better understanding of the purpose, structure, features, and functions of this utility model, detailed descriptions are provided below with reference to specific embodiments.

[0021] In the description of this utility model, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model 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. Therefore, they should not be construed as limitations on this utility model.

[0022] Complex rotating rubber sealing components, such as some skeleton oil seals used in automobiles, are mainly used for sealing reciprocating motion. (Refer to...) Figure 1 The product is a rotating body with multiple threaded sealing lips. During mass production, if the flow channel design is not reasonable, it is easy to cause material shortages at the connection angle of the threaded sealing lip structure, resulting in low processing accuracy and high product defect rate.

[0023] Please refer to the reference. Figures 2-3 This utility model discloses a cold runner injection mold for mass production of rotating rubber seals, comprising a mold body 1 and N main mold cavities 2 located on the mold body 1, wherein N > 1 and is a natural number; each mold cavity has a main injection port 3 in the center, each main injection port 3 has 4 main runners 4 symmetrically arranged around its periphery, and each main runner 4 has 4 branch runners 5 symmetrically extended around its tail end, each branch runner 5 corresponding to a single mold cavity 6. A total of 4*4*N single mold cavities 6 are arranged on the mold body 1. The main runners 4 and branch runners 5 are all distributed in an "I" shape. All main runners 4 have the same length, and all branch runners 5 have the same length. All intersections between runners are arc transition structures.

[0024] The mold body 1 of this utility model can adopt the current injection mold structure, which includes, from top to bottom, a flow channel plate, an upper template, a middle template, a lower template, and a lower template pad. The flow channel plate is fixed on the mold hanging device. The hot injection flow channel plate is connected to the heat insulation plate and the cold flow channel body in sequence. The upper template and the middle template are movable plates, and the lower template and the lower mold pad are fixed on the lower heating plate.

[0025] The specific usage process of this utility model's cold runner injection mold is as follows: Rubber material is injected into the upper mold platen's flow channel through the injection nozzle / cold runner combination, and then enters the vulcanization cavity through the flash in the middle mold's inner hole. After vulcanization, the upper, middle, and lower molds of the injection mold move out simultaneously. The rubber material in the upper mold's flow channel is cleaned. After cleaning, the upper and middle molds rise sequentially to clean the flash and excess rubber from the lower mold. The lower mold moves in, the middle mold descends, and the lower mold platen ejection mechanism rises to remove the rubber sealing product. After removing the product, the lower mold platen descends, the middle mold rises, the lower mold moves out, and the middle mold descends. A skeleton placement fixture is used to place the skeleton. The mold moves in, closes, injects, vulcanizes, removes the product, and takes out the product, completing one cycle. The specific production process is roughly the same as existing cold runner injection molds.

[0026] The injection mold of this invention can simultaneously produce dozens or even more than a hundred rotating rubber seals. The main mold cavity 2, the individual mold cavity 6, the main runner 4, and the branch runners 5 are all symmetrically and evenly arranged, with equal runner lengths. The intersections of each runner are all rounded, which effectively reduces the flow resistance of the rubber material and makes the flow smoother. When mass-producing rotating seals with complex structures, the product quality is better, the precision is higher, and the defect rate is lower.

[0027] In some embodiments, the width of the main channel 4 is 5 mm and the depth is 2.5 mm, and the rubber compound has good flowability in the main channel 4 under this structure.

[0028] In some preferred embodiments, the width of the branch channel 5 is 3mm and the depth is 2.5mm. This structure allows for good flow of the adhesive within the main channel 4. The depth of the branch channel 5 is consistent with that of the main channel 4, while its width is slightly smaller. This allows the adhesive in the main channel 4 to flow smoothly into the branch channel 5, while ensuring a moderate amount of adhesive flowing into each branch channel 5. This avoids affecting the flowability of the branch channel 5, preventing both interruptions and excessive overflow. Consequently, each mold cavity unit connected to the branch channel 5 receives a good adhesive injection effect, thus improving product quality.

[0029] In some embodiments, the mold body 1 has eight main mold cavities 2, which are symmetrically arranged in a rectangular shape. Under this structure, a total of 128 individual mold cavities 6 are arranged on the injection mold, that is, 128 rotating rubber seals can be produced at one time.

[0030] In some embodiments, the injection port of each individual mold cavity 6 is located at the center of the top surface of the larger diameter end of the produced rubber rotary seal. After the rubber material enters the individual mold cavity 6 from the injection port, since it is larger at the top and smaller at the bottom, and the product is a spiral rotating body, the rubber material gradually rotates and circulates downwards along the spiral from the top, which can more fully fill the individual mold cavity 6, thereby making the injection of rubber sufficient and uniform, and effectively improving the product quality.

[0031] In some embodiments, the injection port of the single mold cavity 6 is circular, which is beneficial to the flow of the adhesive material. In addition, the product is a rotating body and its main cross-sectional shape is also circular. The circular injection port facilitates full injection of adhesive.

[0032] In some embodiments, the injection port diameter of the single mold cavity 6 is 0.05-0.1 mm and the height is 0.2-0.4 mm.

[0033] In some embodiments, the mold body 1 is composed of multiple templates made of P20H mold steel material. P20H mold steel material has excellent corrosion resistance, strength, and hardness, which can ensure that the injection mold is not contaminated during use.

[0034] This utility model has been described by the above-described embodiments; however, these embodiments are merely examples for implementing this utility model. It must be noted that the disclosed embodiments do not limit the scope of this utility model. Conversely, any modifications and refinements made without departing from the spirit and scope of this utility model are within the scope of patent protection of this utility model.

Claims

1. A cold runner injection mold for batch production of a rotary body rubber seal, characterized by: The mold includes a mold body and N main mold cavities located on the mold body, where N > 1 and is a natural number; each mold cavity has a main injection port in the center, and each main injection port has 4 main runners symmetrically arranged around its periphery. Each main runner extends symmetrically around its end to form 4 branch runners, and each branch runner corresponds to a single mold cavity. The mold body has a total of 4*4*N single mold cavities. The main runners and branch runners are all distributed in an "I" shape. All main runners have the same length, and all branch runners have the same length. All intersections between runners are rounded transition structures.

2. The cold flow injection mold for mass-producing a rubber seal of a rotary body according to claim 1, characterized by: The main channel is 5mm wide and 2.5mm deep.

3. The cold flow injection mold for mass-producing the rubber seal of a rotary body according to claim 2, characterized by: The width of the branch channel is 3mm and the depth is 2.5mm.

4. The cold flow injection mold for mass-producing the rubber seal of a rotary body according to claim 1, characterized by: The mold body has 8 main mold cavities, and the 8 main mold cavities are symmetrically distributed in a rectangular shape.

5. The cold flow injection mold for mass producing the rubber seal of a rotary body according to claim 1, characterized by: The injection port of each individual mold cavity is located at the center of the top surface of the larger diameter end of the produced rubber rotary seal.

6. The cold runner injection mold for mass production of rotating rubber seals as described in claim 5, characterized in that: The injection port of the single mold cavity is circular.

7. The cold flow injection mold for mass-producing the rubber seal of a rotary body according to claim 6, wherein: The injection port diameter of the single mold cavity is 0.05-0.1mm, and the height is 0.2-0.4mm.

8. The cold flow injection mold for mass producing the rubber seal of a rotary body according to claim 1, characterized by: The main body of the mold is composed of multiple templates made of P20H mold steel.

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