Die for manufacturing rubber sealing ring

Abstract

The utility model relates to a die for manufacturing a rubber sealing ring. Comprising a lower die body and an upper die body arranged in the lower die body in a sleeved mode, an annular excess material groove is formed in the side wall of a cone-frustum-shaped groove of the lower die body, and a lower die cavity of a sealing ring is formed below the annular excess material groove; a first cone frustum and a second cone frustum are arranged at the bottom of the upper die, and the second cone frustum is provided with an upper die cavity of the sealing ring; the lower die cavity and the upper die cavity form a cavity of the sealing ring, the first cone frustum is attached to the cone-frustum-shaped groove in a grinding-fit mode, a first gap is formed by the side wall of the second cone frustum and the side wall of the cone-frustum-shaped groove, and the first gap is communicated with the excess material groove and the cavity of the sealing ring. When the rubber sealing ring is vulcanized, redundant rubber materials are discharged along the first gap, so that mold staggering of products is prevented, and the qualification rate of the products is improved; and the annular excess material groove is formed in the side wall of the lower die, the exhaust effect is achieved, redundant rubber discharged along the first gap is collected, and the stability of the product is improved.

Description

Technical Field

[0001] This utility model relates to the field of rubber sealing ring mold processing technology, specifically to a mold for making rubber sealing rings. Background Technology

[0002] The rubber products industry is one of the important basic industries of the national economy. With the continuous economic development in recent years, O-rings have become one of the most commonly used sealing rings, mainly used for dynamic seals or seals of piston rods, pistons, etc., where high sealing requirements are required.

[0003] In traditional processing, it is necessary to estimate the thickness of the rubber edge of the product during processing. Based on the thickness of the rubber edge and combined with experience, the cavity size is offset by a certain value when processing the upper or lower mold. This method is used to roughly calculate and eliminate or reduce mold misalignment caused by the rubber edge thickness raising the mold cavity during vulcanization.

[0004] Therefore, it is necessary to improve one or more of the problems existing in the above-mentioned related technical solutions.

[0005] It should be noted that this section is intended to provide background or context for the technical solutions of this utility model as set forth in the claims. The description herein does not constitute an admission that it is prior art simply because it is included in this section. Utility Model Content

[0006] The purpose of this utility model embodiment is to provide a mold for manufacturing rubber sealing rings, thereby overcoming at least to some extent one or more problems caused by the limitations and defects of related technologies.

[0007] This utility model embodiment provides a mold for manufacturing rubber sealing rings, comprising a lower mold and an upper mold fitted inside the lower mold, including:

[0008] The lower mold is provided with a frustum-shaped groove, and the side wall of the frustum-shaped groove is provided with an annular material groove. A lower mold cavity with a sealing ring is provided under the annular material groove.

[0009] The bottom of the upper mold is provided with a stepped truncated cone consisting of a first truncated cone and a second truncated cone extending coaxially from the small end of the first truncated cone, and the second truncated cone is provided with an upper mold cavity with a sealing ring.

[0010] The lower mold cavity and the upper mold cavity form the cavity of the sealing ring. The first truncated cone and the truncated cone-shaped groove are fitted together. The side wall of the second truncated cone and the side wall of the truncated cone-shaped groove form a first gap. The first gap communicates with the cavities of the residual material groove and the sealing ring, respectively.

[0011] In one embodiment of this utility model, a second gap is provided between the end face of the small end of the stepped frustum and the bottom surface of the frustum-shaped groove.

[0012] In one embodiment of this utility model, the first gap and the second gap are in communication.

[0013] In one embodiment of this utility model, the range of the first gap is 0.06mm-0.10mm.

[0014] In one embodiment of this utility model, the size of the second gap is greater than 1 mm.

[0015] In one embodiment of this utility model, the top of the upper mold is connected to an upper template, and the bottom of the lower mold is connected to a lower template.

[0016] In one embodiment of this utility model, the top of the upper mold is provided with a first protrusion, and the side wall of the first protrusion is provided with a first slot. The bottom of the lower mold is provided with a second protrusion, and the side wall of the second protrusion is provided with a second slot. The first protrusion of the upper mold passes through the first slot of the upper template and is connected to the upper template by a snap ring and the first slot. The second protrusion of the lower mold passes through the second slot of the lower template and is connected to the lower template by a snap ring and the second slot.

[0017] In one embodiment of this utility model, multiple first protrusions of multiple upper molds pass through multiple first locking holes of the upper template, and multiple snap rings are connected to multiple first locking slots to connect the multiple upper molds to the upper template. Multiple second protrusions of multiple lower molds pass through multiple second locking holes of the lower template, and multiple snap rings are connected to multiple second locking slots to connect the multiple lower molds to the lower template, forming a multi-cavity mold.

[0018] In one embodiment of this utility model, the upper template is provided with a positioning hole, and the lower template is provided with a guide pin. When the positioning hole of the upper template is aligned with the guide pin on the lower template, the stepped truncated cone of the upper mold enters the truncated cone-shaped groove of the lower mold.

[0019] In one embodiment of this utility model, the bottom of the lower mold is provided with a flow hole, the flow hole is in communication with the second gap, and the lower mold plate is provided with a glue guiding channel, the glue guiding channel is in communication with the flow hole.

[0020] The technical solution provided by one embodiment of this utility model may include the following beneficial effects:

[0021] This utility model provides a mold for manufacturing rubber sealing rings. On one hand, a first gap is formed between the side wall of the second truncated cone of the upper mold and the side wall of the truncated cone-shaped groove of the lower mold, allowing excess rubber material to be discharged along the first gap during vulcanization of the rubber sealing ring, preventing product mismolding and improving the product qualification rate. On the other hand, the side wall of the lower mold is provided with an annular excess material groove, and the first gap communicates with the excess material groove and the cavity of the sealing ring, respectively. During vulcanization of the rubber sealing ring, it has the function of venting and collecting the excess rubber material discharged along the first gap, improving the stability of the product. Attached Figure Description

[0022] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments conforming to the present invention and, together with the description, serve to explain the principles of the present invention. It is obvious that the drawings described below are merely some embodiments of the present invention, and those skilled in the art can obtain other drawings based on these drawings without any inventive effort.

[0023] Figure 1 A cross-sectional schematic diagram of a mold used to manufacture a rubber sealing ring is shown in an exemplary embodiment of the present invention;

[0024] Figure 2 This diagram shows a partial view of the first gap after the mold is closed in an exemplary embodiment of the present invention.

[0025] Figure 3 This diagram shows a stepped cross-sectional view of a multi-cavity mold in an exemplary embodiment of the present invention.

[0026] Reference numerals: 100, upper mold; 101, first truncated cone; 102, second truncated cone; 103, upper mold cavity; 104, first gap; 200, lower mold; 201, material groove; 202, lower mold cavity; 203, second gap; 300, upper template; 301, guide sleeve; 400, lower template; 401, guide pin; 500, snap ring. Detailed Implementation

[0027] Exemplary embodiments will now be described more fully with reference to the accompanying drawings. However, these exemplary embodiments can be implemented in many forms and should not be construed as limited to the examples set forth herein; rather, they are provided to make the present invention more comprehensive and complete, and to fully convey the concept of the exemplary embodiments to those skilled in the art. The described features, structures, or characteristics may be combined in any suitable manner in one or more embodiments.

[0028] Furthermore, the accompanying drawings are merely illustrative diagrams of embodiments of the present invention and are not necessarily drawn to scale. The same reference numerals in the drawings denote the same or similar parts, and therefore repeated descriptions of them will be omitted. Some block diagrams shown in the drawings are functional entities and do not necessarily correspond to physically or logically independent entities.

[0029] This example embodiment provides a mold for manufacturing rubber sealing rings, see reference. Figure 1 As shown, the mold for making rubber sealing rings may include an upper mold 100 and a lower mold 200.

[0030] The upper mold 100 is set in the lower mold 200;

[0031] The lower mold 200 is provided with a frustum-shaped groove, and the side wall of the frustum-shaped groove is provided with an annular material groove 201. A lower mold cavity 202 with a sealing ring is provided below the annular material groove 201.

[0032] The bottom of the upper mold 100 is provided with a stepped truncated cone consisting of a first truncated cone 101 and a second truncated cone 102 extending coaxially from the small end of the first truncated cone 101. The second truncated cone 102 is provided with an upper mold cavity 103 with a sealing ring.

[0033] The lower mold cavity 202 and the upper mold cavity 103 form the cavity of the sealing ring. The first truncated cone 101 is fitted and aligned with the truncated cone-shaped groove. The side wall of the second truncated cone 102 and the side wall of the truncated cone-shaped groove form a first gap 104. The first gap 104 communicates with the residual material groove 201 and the cavity of the sealing ring, respectively.

[0034] The aforementioned mold for manufacturing rubber sealing rings provides several advantages. Firstly, the sidewall of the second truncated cone 102 of the upper mold 100 and the sidewall of the truncated cone-shaped groove of the lower mold 200 form a first gap 104. This gap allows excess rubber material to be discharged along the first gap 104 during vulcanization, preventing mold defects and improving product yield. Secondly, the sidewall of the lower mold 200 is provided with an annular excess material groove 201. The first gap 104 communicates with both the excess material groove 201 and the cavity of the sealing ring. During vulcanization, this groove serves to release air and collect excess rubber material discharged along the first gap 104, improving product stability.

[0035] The following will refer to Figures 1 to 3 The various parts of the mold for making the rubber sealing ring described above in this example embodiment will be explained in more detail.

[0036] The lower mold 200 is provided with a truncated cone-shaped groove. The annular excess material groove 201 on the side wall of the groove is used to guide the flow of excess rubber material. The lower mold cavity 202 below it is part of the sealing ring cavity. The bottom of the upper mold 100 is a stepped truncated cone structure, composed of a first truncated cone 101 and a second truncated cone 102. The upper mold cavity 103 on the second truncated cone 102 and the lower mold cavity 202 together form a complete sealing ring cavity. The first truncated cone 101 fits snugly with the truncated cone-shaped groove, ensuring precise positioning and sealing when the upper mold 100 and the lower mold 200 are closed. The first gap 104 formed by the side wall of the second truncated cone 102 and the side wall of the truncated cone-shaped groove is a channel for excess rubber material to be discharged. It communicates with the excess material groove 201 and the sealing ring cavity respectively. During the vulcanization process of the rubber sealing ring, excess rubber material can be discharged smoothly, avoiding product mismolding due to rubber material accumulation.

[0037] In one embodiment, a second gap 203 is provided between the end face of the small end of the stepped truncated cone and the bottom surface of the truncated cone-shaped groove. The first gap 104 communicates with the second gap 203. The first gap 104 ranges from 0.06mm to 0.10mm, and the second gap 203 is larger than 1mm. It should be understood that the second gap 203 provides additional space for excess rubber material. During the rubber vulcanization process, in addition to the rubber material discharged through the first gap 104, some rubber material may continue to flow downwards. The second gap 203 can receive this portion of rubber material, preventing it from accumulating inside the mold, thereby further ensuring the molding quality of the product and reducing product defects caused by rubber residue. The communication between the first gap 104 and the second gap 203 makes the flow path of excess rubber material inside the mold smoother. After the adhesive material flows out of the cavity through the first gap 104, it can continue to flow directly through the connecting second gap 203 without forming a blockage at the junction of the two gaps. This ensures the continuity of adhesive material discharge, effectively improves the mold's ability to handle excess adhesive material, and further improves the product yield. The first gap 104 ranges from 0.06mm to 0.10mm. The first gap 104 controls the thickness of the adhesive edge on the product. If the adhesive edge is too thick, it is difficult to trim, affecting product quality. If the gap is too small, excess adhesive material cannot be discharged smoothly, which may lead to adhesive material accumulation in the cavity, causing problems such as flash and dimensional deviations. If the gap is too large, too much adhesive material may flow out, wasting material and potentially affecting the molding accuracy of the product, resulting in a decrease in product sealing performance. The size of the first gap 104 ensures both smooth adhesive material discharge and product quality and performance. The size of the second gap 203 is greater than 1mm, and the larger second gap 203 provides sufficient space to accommodate excess adhesive material. During the vulcanization process, a large amount of excess rubber material will flow in all directions under pressure. The second gap 203, which is larger than 1mm, can fully receive the rubber material flowing in from the first gap 104 and the rubber material that may be squeezed out from other directions, so as to avoid excessive accumulation of rubber material that would cause the upper mold to be raised, thereby preventing the occurrence of mold misalignment and improving the dimensional accuracy and quality stability of the product.

[0038] In one embodiment, the top of the upper mold 100 is connected to the upper template 300, and the bottom of the lower mold 200 is connected to the lower template 400. The top of the upper mold 100 has a first boss, and the side wall of the first boss has a first slot. The bottom of the lower mold 200 has a second boss, and the side wall of the second boss has a second slot. The first boss of the upper mold 100 passes through a first locking hole in the upper template 300, and is connected to the upper template 300 by a retaining spring 500 connected to the first slot. The second boss of the lower mold 200 passes through a second locking hole in the lower template 400, and is connected to the lower template 400 by a retaining spring 500 connected to the second slot. It should be understood that the top of the upper mold 100 is connected to the upper template 300, and the bottom of the lower mold 200 is connected to the lower template 400. This makes the mold more stable during use and facilitates installation on vulcanizing equipment. The upper template 300 and lower template 400 support and fix the upper mold 100 and lower mold 200, while also facilitating handling, loading, and unloading operations, thus improving the practicality and operability of the mold. The first boss at the top of the upper mold 100 passes through the first locking hole of the upper template 300 and connects to the first locking groove on the side wall of the first boss via a retaining spring 500. The retaining spring 500 provides installation limitation, making installation convenient, quick, and interchangeable. Similarly, the second boss at the bottom of the lower mold 200 passes through the second locking hole of the lower template 400 and connects to the lower mold 200 via a retaining spring 500 and the second locking groove. This not only ensures the firmness of the connection between the upper mold 100 and lower mold 200 and the templates but also allows for convenient disassembly and installation when the mold needs repair or parts replacement, improving the maintainability of the mold.

[0039] In one embodiment, multiple first protrusions of multiple upper molds 100 pass through multiple first locking holes of upper template 300, and multiple retaining springs 500 are connected to multiple first locking slots to connect the multiple upper molds 100 to the upper template 300. Similarly, multiple second protrusions of multiple lower molds 200 pass through multiple second locking holes of lower template 400, and multiple retaining springs 500 are connected to multiple second locking slots to connect the multiple lower molds 200 to the lower template 400, forming a multi-cavity mold. The upper template 300 is provided with positioning holes 301, and the lower template 400 is provided with guide pins 401. When the positioning holes 301 of the upper template 300 are aligned with the guide pins 401 on the lower template 400, the stepped frustum of the upper mold 100 enters the frustum-shaped groove of the lower mold 200. The bottom of the lower mold 200 is provided with a flow hole, which communicates with the second gap 203. The lower template 400 is provided with a glue guiding channel, which communicates with the flow hole. It should be understood that the multi-cavity mold design improves production efficiency, allowing multiple rubber sealing rings to be produced simultaneously in a single vulcanization process, reducing the production cycle, lowering production costs, and meeting the needs of large-scale production. The upper template 300 is provided with a positioning hole 301, and the lower template 400 is provided with a guide pin 401. During mold closing, the positioning hole 301 of the upper template 300 aligns with the guide pin 401 of the lower template 400, ensuring that the stepped truncated cone of the upper mold 100 accurately enters the truncated cone-shaped groove of the lower mold 200. This positioning method effectively improves the accuracy of mold closing, avoids misalignment between the upper and lower molds 200, ensures the dimensional accuracy and shape accuracy of each cavity, thereby improving product quality and consistency. The flow hole at the bottom of the lower mold 200 is connected to the second gap 203, and the glue guiding channel on the lower mold plate 400 is also connected to the flow hole. During vulcanization, excess rubber flows into the flow hole through the first gap 104 and the second gap 203, and then exits the mold through the glue guiding channel. This further optimizes the discharge path of excess rubber, avoids the accumulation of rubber at the bottom of the mold, keeps the mold clean, helps improve the molding quality and production efficiency of the product, and facilitates the collection and treatment of the discharged rubber.

[0040] The operating procedure involves calculating the weight and dimensions of the rubber compound based on the product dimensions. The compound is then mixed according to the formula, allowed to stand for a specified time, and extruded into sheets of a specific thickness. These sheets are then cut into strips of a certain length and width manually or using a cutting machine. After ensuring the strip weight is within acceptable limits, the ends of the strips are joined together with some adhesive, or heated on a flat vulcanizing machine and overlapped to form a ring-shaped semi-finished product. The vulcanization time, temperature, pressure, and other relevant parameters of the flat vulcanizing machine are set according to the product and rubber compound properties. Once the mold temperature reaches the set point, the upper mold is opened (100°), and the prepared semi-finished product is placed into the mold cavity. The position of the semi-finished product is adjusted to prevent material shortage during vulcanization. When the upper mold 100 is closed, excess rubber and gas flow out along the first gap 104. The excess material flows upward through the first gap 104 into the excess material groove 201, and downward through the first gap 104 into the second gap 203. This avoids mold misalignment issues, and the excess rubber flowing out prevents the upper mold 100 from lifting due to the rubber edge, thus avoiding product defects such as increased rubber edge thickness. After the set time is reached, the flat vulcanizing machine automatically opens. Use an air gun to lift the product and remove it.

[0041] It should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," and "counterclockwise" in the above description 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 the embodiments of 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 the embodiments of this utility model.

[0042] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the embodiments of this utility model, "a plurality of" means two or more, unless otherwise explicitly specified.

[0043] In the embodiments of this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0044] In this embodiment of the invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0045] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. In addition, those skilled in the art can combine and integrate the different embodiments or examples described in this specification.

[0046] Other embodiments of the present invention will readily occur to those skilled in the art upon consideration of the specification and practice of the invention disclosed herein. This application is intended to cover any variations, uses, or adaptations of the invention that follow the general principles of the invention and include common knowledge or customary techniques in the art not disclosed herein. The specification and examples are to be considered exemplary only, and the true scope and spirit of the invention are indicated by the appended claims.

Claims

1. A mold for making a rubber seal ring, composed of a lower mold and an upper mold fitted in the lower mold, characterized in that, The application relates to a multi-cavity mold. The lower mold is provided with a conical frustum-shaped recess, the side wall of the conical frustum-shaped recess is provided with a ring-shaped excess material groove, and a lower mold cavity provided with a sealing ring is arranged below the ring-shaped excess material groove; The bottom of the upper mold is provided with a stepped conical frustum composed of a first conical frustum and a second conical frustum coaxially extended from the small end of the first conical frustum, and an upper mold cavity provided with a sealing ring is arranged in the second conical frustum. The lower mold cavity and the upper mold cavity form a mold cavity provided with a sealing ring, the first conical frustum is in close contact with the conical frustum-shaped recess, the side wall of the second conical frustum forms a first gap with the side wall of the conical frustum-shaped recess, and the first gap is in communication with the excess material groove and the mold cavity provided with the sealing ring respectively.

2. The mold for manufacturing a rubber seal ring according to claim 1, wherein The small end surface of the stepped conical frustum and the bottom surface of the conical frustum-shaped recess are provided with a second gap.

3. The mold for manufacturing a rubber seal ring according to claim 2, wherein The first gap is in communication with the second gap.

4. The mold for manufacturing a rubber seal ring according to claim 1, wherein The range of the first gap is 0.06mm-0.10mm.

5. The mold for manufacturing a rubber seal ring according to claim 2, wherein The size of the second gap is greater than 1mm.

6. The mold for manufacturing a rubber seal ring according to claim 2, wherein The top of the upper mold is connected with an upper mold plate, and the bottom of the lower mold is connected with a lower mold plate.

7. The mold for manufacturing a rubber sealing ring according to claim 6, wherein The top of the upper mold is provided with a first boss, the side wall of the first boss is provided with a first clamping groove, the bottom of the lower mold is provided with a second boss, the side wall of the second boss is provided with a second clamping groove, the first boss of the upper mold passes through a first clamping hole of the upper mold plate, the upper mold is connected to the upper mold plate by the connection of a clamping spring and the first clamping groove, the second boss of the lower mold passes through a second clamping hole of the lower mold plate, and the lower mold is connected to the lower mold plate by the connection of a clamping spring and the second clamping groove.

8. The mold for manufacturing a rubber seal ring according to claim 7, wherein A plurality of first bosses of the upper molds respectively pass through a plurality of first clamping holes of the upper mold plate, a plurality of clamping springs are respectively connected with a plurality of first clamping grooves to connect the plurality of upper molds to the upper mold plate, a plurality of second bosses of the lower molds pass through a plurality of second clamping holes of the lower mold plate, and a plurality of clamping springs are connected with a plurality of second clamping grooves to connect the plurality of lower molds to the lower mold plate, thereby forming a multi-cavity mold.

9. The mold for manufacturing a rubber seal ring according to claim 8, wherein Positioning holes are arranged on the upper mold plate, guide pins are arranged on the lower mold plate, when the positioning holes of the upper mold plate are aligned with the guide pins on the lower mold plate, the stepped conical frustum of the upper mold is arranged in the conical frustum-shaped recess of the lower mold.

10. The mold for manufacturing a rubber seal ring according to claim 9, wherein The bottom of the lower mold is provided with a flow hole in communication with the second gap, and a glue guiding channel is arranged on the lower mold plate and in communication with the flow hole.

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