Rubber sealing ring forming die

Abstract

The utility model relates to the technical field of rubber molds, and discloses a rubber sealing ring forming mold which comprises an upper mold plate, a middle mold plate, a lower mold plate and an inner mold core, and cavities are formed among the upper mold plate, the middle mold plate, the lower mold plate and the inner mold core. The lower die plate is provided with a matching protrusion and a long guide column, and the cross section of the matching protrusion is in a trapezoid shape with the lower bottom length larger than the upper bottom length. A through hole is formed in the middle template and is movably connected with the long guide column; the upper die plate is provided with guide holes matched with the long guide columns. The inner mold core is connected with the upper mold plate, the inner mold core is provided with a matching groove matched with the matching protrusion, coarse positioning among the mold plates is achieved through matching among the long guide columns, the guide holes and the through holes, accurate positioning is carried out through the matching groove and the matching protrusion, the matching accuracy among the molds is improved, and the problems of hard collision, abrasion and the like among the molds are avoided.

Description

Technical Field

[0001] The utility model relates to the technical field of rubber molds, and more specifically, to a rubber sealing ring forming mold. Background Art

[0002] Rubber rings are widely used in the modern mechanical field and are commonly used in various sealing structures. The production of large corrugated pipe rubber sealing rings often adopts vulcanizer molding. Because of its complex cross-sectional shape and usually having structures such as grooves, the fitting and positioning accuracy of the mold is an important factor affecting product quality. In the existing technology, for example, a rubber sealing ring molding mold disclosed in CN219294537U realizes three-plate molding through the combined design of an upper mold, a middle mold, and a lower mold. Moreover, the middle mold is easy to disassemble, install, and position. Combined with an ejection mechanism, it is convenient for the demolding of the rubber ring, saving time and effort and being beneficial to improving production efficiency. However, when using this mold, only by setting guide posts at the lower mold, sleeve holes matching the guide posts at the middle mold, and guide holes at the upper mold for positioning between the molds, the overall positioning accuracy is not high, and problems such as mold damage such as die biting and abrasion are likely to occur. Summary of the Utility Model

[0003] In order to solve the problems of low positioning accuracy of the rubber sealing ring mold and easy damage to the mold, the utility model provides a rubber sealing ring forming mold. Coarse positioning is carried out through the clearance fit between the long guide posts arranged on the lower template and the guide holes of the upper template and the through holes of the middle template. After the molds are fitted, precise positioning is carried out through the mating groove on the inner mold core and the trapezoidal mating protrusion on the lower template, thereby improving the overall positioning accuracy of the sealing rubber ring mold and avoiding mold damage.

[0004] In order to solve the above technical problems, the utility model provides the following technical solutions:

[0005] A rubber sealing ring forming mold includes an upper template, a middle template, a lower template, and an inner mold core. A cavity is provided between the upper template, the middle template, the lower template, and the inner mold core. The lower template is provided with a mating protrusion and long guide posts. The cross-section of the mating protrusion is a trapezoid with the length of the lower base greater than the length of the upper base. The middle template is provided with a through hole, and the through hole is movably connected with the long guide posts. The upper template is provided with a guide hole matching the long guide posts. The inner mold core is connected to the upper template, and the inner mold core is provided with a mating groove matching the mating protrusion.

[0006] The rubber seal ring forming die of the utility model, the upper template, the middle template, the lower template and the inner die core jointly form a cavity for forming the rubber ring die. A long guide post is arranged on the lower template, and the long guide post passes through the through hole and is movably connected with the middle template. The upper template is matched with the long guide post through the guide hole. When the dies are matched, first, the long guide post is used for guiding to complete the rough positioning between the upper template, the middle template and the lower template. When the dies gradually approach and fit, depending on the matching protrusion on the lower template and the matching groove on the inner die core, the trapezoidal positioning protrusion can provide an inclined plane for precise positioning, and the length of the lower base is greater than that of the upper base to ensure that the matching groove and the matching protrusion can be successfully matched. The two positioning methods cooperate with each other, improving the positioning accuracy during mold closing and avoiding problems such as hard collision and abrasion between the dies that damage the surface of the dies.

[0007] Further, clearance fits are adopted between the through hole and the long guide post and between the guide hole and the long guide post. Clearance fits are adopted between the long guide post and the through hole and the guide hole. While playing the role of rough positioning, it avoids breaking the long guide post during the movement of the middle template and improves the reliability of the movable connection between the long guide post and the middle template.

[0008] Further, a positioning groove for cooperating with the long guide post is arranged on the lower template, and a positioning screw connected with the long guide post is arranged in the positioning groove. The positioning screw fixes the long guide post in the positioning groove, ensuring that the position of the long guide post on the lower template will not shift, and increasing the positioning accuracy during the mold opening and closing process.

[0009] Further, the matching protrusion is annular and the cross section is an isosceles trapezoid. The matching protrusion is annular and the cross section is set as an isosceles trapezoid. Through the double inclined planes on both sides of the isosceles trapezoid, a surrounding matching surface is formed, making the matching accuracy between the lower template and the inner die core higher and improving the forming quality of the rubber ring.

[0010] Further, a guide post is arranged on the upper template, and a guide sleeve for cooperating with the guide post is arranged on the inner die core; or a guide sleeve is arranged on the upper template, and a guide post for cooperating with the guide sleeve is arranged on the inner die core. The guide post and guide sleeve assist in guiding and prevent the inner die core from shaking or rotating during the mold closing process.

[0011] Further, a plurality of springs are evenly distributed between the inner die core and the upper template, and an equal-height sleeve for restricting the relative position between the upper template and the inner die core is arranged on the upper template. When the mold is opened, the upper template and the inner die core move upward. Under the action of the evenly distributed springs, the upper template and the inner die core are stably separated, facilitating the demolding of the sealing rubber ring. The equal-height sleeve penetrates through the upper template and the inner die core. When the inner die core and the upper template are separated, it restricts the relative position between the two, avoiding damage to the surface of the upper template during subsequent pressing due to excessive separation distance.

[0012] Further, the upper template is provided with an internal snap insert and a locking block. The locking block is arranged on the top of the internal snap insert. One end of the internal snap insert protrudes from the inner mold core, and the distance that the internal snap insert protrudes from the inner mold core is less than the stroke of the guide pillar moving in the guide sleeve. The internal snap insert is arranged on the upper template and one end protrudes from the inner mold core. After mold closing, it is located inside the cavity and is used for forming the internal undercut position of the rubber ring. The locking block can fix the position of the internal snap insert to ensure the forming accuracy of the rubber ring. The distance that the internal snap insert protrudes from the inner mold core is less than the stroke of the guide pillar moving in the guide sleeve, which can ensure that the inner mold core never separates from the internal snap insert during the process of separating from the upper template, avoiding collision during mold closing and damaging the structure of the internal snap insert.

[0013] Further, the middle template is provided with an internal concave position, and the internal concave position is located in the cavity. The internal concave position on the middle template makes the rubber ring form a circumferential protrusion, thereby driving the whole formed rubber ring to move with the middle template and separating from the lower template, which is convenient for demolding.

[0014] Further, a boosting block is arranged on the side wall of the middle template. During the mold opening process, the cylinder or oil cylinder on the vulcanizing machine lifts the boosting block upward, which is convenient for controlling the upward movement of the middle template along the long guide pillar, making the middle template drive the rubber ring product to move. After the middle template separates from the lower template, it stops at an appropriate height, and the rubber ring is taken out from the middle template manually.

[0015] Further, a circular flash groove and an exhaust groove are provided on the parting surface between the middle template and the upper template and between the middle template and the lower template. The circular flash groove is arranged circumferentially around the cavity. After the rubber in the cavity expands due to heat, the excess rubber material overflows to the circular flash groove on the parting surface, forming a relatively thin process flash, which increases the pressure holding performance and forming density. The exhaust grooves are distributed radially and extend outward from the cavity. During the mold closing process, the gas in the cavity is discharged along the exhaust grooves on the parting surface, avoiding quality problems such as edge defects, air bubbles, and undercooking of the rubber ring product.

[0016] Compared with the prior art, the utility model has the following beneficial effects:

[0017] 1. The mold has a three-plate mold structure. The templates are connected in series by long guide pillars and are roughly positioned by clearance fit. When the templates are fitted, precise positioning is assisted by mating protrusions and mating grooves, effectively avoiding hard contact damage to the mating surfaces of the mold.

[0018] 2. The inner mold core adopts a semi-movable core structure. The guide pillar and guide sleeve are precisely guided to prevent rotation. When the mold is opened, the inner mold core can be suspended on the upper template, which is convenient for demolding the undercut position of the sealing ring.

[0019] 3. A circular flash groove and an exhaust groove are provided on the parting surface. After mold closing, it is easy to release gas. After the inner layer of rubber material expands due to heat, it overflows to the circular flash groove. The process flash is thin, the pressure holding performance is good, and the forming density is more ideal. Brief Description of the Drawings

[0020] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings required for use in the embodiments. Obviously, the drawings described below are only some embodiments recorded in the present utility model. For those of ordinary skill in the art, other drawings can also be obtained based on these drawings.

[0021] Figure 1 Schematic diagram of the mold closing state of the rubber seal ring forming mold provided by the present utility model;

[0022] Figure 2 Schematic diagram of the feeding state of the rubber seal ring forming mold provided by the present utility model;

[0023] Figure 3 Schematic diagram of the mold opening and upward movement state of the rubber seal ring forming mold provided by the present utility model;

[0024] Figure 4 Schematic diagram of the fully opened mold opening state of the rubber seal ring forming mold provided by the present utility model;

[0025] Figure 5 Exploded view of the rubber seal ring forming mold provided by the present utility model.

[0026] Explanation of the reference numerals in the drawings:

[0027] 1. Upper template; 11. Guide hole; 12. Guide post; 13. Equal-height sleeve; 14. Inner snap-in insert; 15. Locking block; 2. Middle template; 21. Through hole; 22. Long guide post; 23. Inner concave position; 24. Boosting block; 3. Lower template; 31. Matching protrusion; 32. Positioning groove; 33. Positioning screw; 34. Annular tearing groove; 35. Exhaust groove; 4. Inner mold core; 41. Matching groove; 42. Guide sleeve; 43. Spring. Detailed Description of the Embodiments

[0028] The following further illustrates the present utility model in combination with the specific embodiments. Among them, the drawings are only for illustrative purposes, showing only schematic diagrams, not physical diagrams, and should not be construed as a limitation to this patent; in order to better illustrate the embodiments of the present utility model, some components in the drawings will be omitted, enlarged or reduced, and do not represent the dimensions of the actual product; for those skilled in the art, it is understandable that some well-known structures and their descriptions in the drawings may be omitted.

[0029] In the drawings of the embodiments of the present utility model, the same or similar reference numerals correspond to the same or similar components; in the description of the present utility model, it should be understood that if there are terms such as "upper", "lower", "left", "right", etc. indicating the orientation or positional relationship, they are based on the orientation or positional relationship shown in the drawings. This is only for the convenience of describing the present utility model 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. Therefore, the terms describing the positional relationship in the drawings are only for illustrative purposes and cannot be construed as a limitation of this patent. For those of ordinary skill in the art, the specific meanings of the above terms can be understood according to specific circumstances.

[0030] Embodiment 1

[0031] As Figure 1 、 Figure 2 As shown, a rubber seal ring forming mold provided in this embodiment includes an upper template 1, a middle template 2, a lower template 3, and an inner mold core 4. A cavity is provided between the upper template 1, the middle template 2, the lower template 3 and the inner mold core 4; the lower template 3 is provided with a mating projection 31 and a long guide post 22, and the cross-section of the mating projection 31 is a trapezoid with the length of the lower base greater than that of the upper base; the middle template 2 is provided with a through hole 21, and the through hole 21 is movably connected with the long guide post 22; the upper template 1 is provided with a guide hole 11 that cooperates with the long guide post 22; the inner mold core 4 is connected to the upper template 1, and the inner mold core 4 is provided with a mating groove 41 that cooperates with the mating projection 31.

[0032] During the production process of the rubber ring, first control the middle template 2 to approach the lower template 3 along the long guide post 22. After the lower template 3 and the middle template 2 are in contact, a stock cavity for placing the rubber blank is formed. After the rubber blank is placed, continue to control the upper template 1 and the inner mold core 4 to move downward. When moving downward, the upper template 1 first completes rough guiding through the long guide post 22, the guide hole 11 and the through hole 21. Immediately afterwards, the mating groove 41 on the inner mold core 4 is in contact with the mating projection 31 on the lower template 3 to complete precise positioning. The mating projection 31 is set as a trapezoid with the length of the lower base greater than that of the upper base. Compared with a rectangular projection, the inclined surface fit formed on both sides of the trapezoid can provide more accurate positioning accuracy than the linear fit on both sides of the rectangular cross-section; the length of the lower base is greater than that of the upper base, making the mating process between the mating projection and the mating groove smoother. To further improve the positioning accuracy, the mating projection 31 can be set as a circular ring and the cross-sectional shape is set as an isosceles trapezoid, forming two symmetrical mating inclined surfaces inside and outside the circular ring. After the mold is closed, heat the mold, the rubber material melts and quickly fills the cavity, close the mold and hold the pressure, and the strip-shaped rubber blank is vulcanized and shaped into a rubber ring product.

[0033] A clearance fit is used between the through hole 21 and the long guide pin 22, between the guide hole 11 and the long guide pin 22, and between the positioning groove 32 and the long guide pin 22, and the clearance size is controlled between 1.8mm and 2.2mm. The long guide pin 22 completes the rough positioning between the templates to prevent hard collisions between the templates or scratches between the matching groove 41 and the matching protrusion 31, which affects the surface quality of the template and avoids burrs on the product. A large clearance fit of 1.8mm to 2.2mm is used. A clearance greater than 1.8mm can continue to provide a certain activity space for the middle template 2 to avoid breaking the long guide pin 22 during the movement of the middle template 2; at the same time, the clearance is controlled to be less than 2.2mm to ensure the overall positioning accuracy between the molds.

[0034] Embodiment 2

[0035] like Figure 2 , Figure 3 As shown, this embodiment is similar to the first embodiment, except that the upper mold plate 1 of this embodiment is provided with a guide post 12, the inner mold core 4 is provided with a guide sleeve 42, and the guide post 12 is connected to the guide sleeve 42; the guide sleeve 42 is provided on the upper mold plate 1, and the guide post 12 provided in the inner mold core and connected to the guide sleeve 42 can also achieve a guiding effect. The guide post 12 and the guide sleeve 42 structure are used for guidance to prevent the inner mold core 4 from rotating during the mold closing process, fix the relative position of the inner mold core 4 and the upper mold plate 1, and improve the quality stability of the rubber ring product production.

[0036] A number of evenly distributed springs 43 are arranged between the inner mold core 4 and the upper mold plate 1, and a contour sleeve 13 for limiting the relative position of the upper mold plate 1 and the inner mold core 4 is arranged on the upper mold plate 1. During the mold closing process, the inner mold core 4 and the upper mold plate 1 approach the lower mold plate 3, the matching groove 41 fits with the matching protrusion 31, and the guide hole 11 fits with the long guide column 22. At this time, the spring 43 is in a compressed state. During the mold opening process after the rubber ring is produced, the inner mold core 4 and the upper mold plate 1 move upward and separate from the rubber ring. During the upward process, the spring 43 is no longer compressed. At this time, the inner mold core 4 is separated from the upper mold plate 1 under the action of the spring 43, and is hung on the upper mold plate 1 by the contour sleeve 13, and continues to move upward with the upper mold plate 1. The inner mold core 4 adopts a semi-movable core structure. When the mold is opened, the inner mold core 4 can be hung on the upper mold plate 1. The separation of the upper mold plate 1 and the inner mold core 4 can provide sufficient demoulding space for the inner buckle position on the rubber ring, reduce the demoulding difficulty, facilitate the demoulding of the inverted buckle position of the sealing ring, and save demoulding time.

[0037] like Figure 3 , Figure 4As shown in the figure, the upper template 1 is provided with an internal snap-in insert 14 and a locking pressure block 15. The locking pressure block 15 is arranged on the top of the internal snap-in insert 14. One end of the internal snap-in insert 14 protrudes from the upper template 1 and is sleeved in the internal mold core 4. The internal snap-in insert 14 is used to control the shape and position of the internal snap during the rubber ring forming process, and different internal snap-in inserts 14 can be replaced according to production needs. The locking pressure block 15 is arranged on the internal snap-in insert 14, which is used to fix the position of the internal snap-in insert 14 and ensure sufficient pressure during the mold closing process, improving the forming quality of the internal snap of the rubber ring. When installing the internal snap-in insert 14, it is necessary to ensure that the internal snap-in insert 14 is sleeved in the internal mold core 4 and one end protrudes from the internal mold core 4, so as to control the cavity shape during the forming process and form an internal snap on the rubber ring. At the same time, the distance that the internal snap-in insert 14 protrudes from the internal mold core 4 should be less than the stroke of the guide pillar 12 in the guide sleeve 42 when the internal mold core moves, so that the internal mold core 4 never detaches from the internal snap-in insert 14 during the movement process, and avoid collision between the internal mold core 4 and the internal snap-in insert 14 during the mold closing process.

[0038] Embodiment 3

[0039] As Figure 5 shown in the figure, this embodiment is similar to Embodiment 1. The difference is that the parting surfaces between the middle template 2 and the upper template 1 and between the middle template 2 and the lower template 3 are both provided with a circumferential tearing edge groove 34 and an exhaust groove 35 perpendicular to the mold opening direction. The circumferential tearing edge groove 34 is arranged around the cavity in the circumferential direction to facilitate trimming the rubber ring. During the production process of the rubber ring, the upper template 1, the middle template 2, the lower template 3 and the internal mold core 4 are first closed. After the mold closing is completed, the vulcanizing machine heats each template, and the rubber compound is heated and melted, quickly filling the cavity. The excess compound flows into the circumferential tearing edge groove 34 along the parting surface. The formed process flash has a thin thickness, and at the same time, the cavity pressure holding performance is good, improving the forming density of the rubber ring and facilitating the removal of the surplus material in the subsequent processing process. The exhaust groove 35 is distributed radially and extends from the cavity to the outside of the mold. During the forming process, the vulcanizing machine drives the upper template 1 to perform multiple micro-lifting and pressing actions, facilitating the discharge of the gas in the cavity. During this period, the excess compound drills out of the cavity through the exhaust groove 35. After the exhaust is completed, the mold is closed and pressure is held, controlling the positions of each template unchanged, and the sealing ring is vulcanized and shaped. The exhaust groove 35 can assist the gas in the cavity to escape during the mold closing and forming process, avoiding problems such as gas curling and bubbles in the product.

[0040] The middle template 2 is provided with a concave position 23, and the concave position 23 is communicated with the cavity. When the mold is closed, the rubber ring is formed in the cavity, and a circumferential protrusion is formed at the concave position 23. After the mold closing is completed, the middle template 2 moves upward along the long guide post 22, and under the action of the concave position 23, the whole rubber ring is driven to separate from the lower template 3. Subsequently, the middle template 2 stops at an appropriate height, and the rubber ring product is taken out manually. A number of groups of boosting blocks 24 are evenly arranged on the side surface of the middle template 2 to ensure the stability of the movement of the middle template 2. During the mold closing process, the cylinder or oil cylinder on the vulcanizing machine presses the boosting blocks 24 downward to drive the middle template 2 to steadily approach the lower template 3; during the mold opening process, the cylinder or oil cylinder jacks up the boosting blocks 24 upward to drive the middle template 2 to separate from the lower template 3, facilitating the taking out of the rubber ring product.

[0041] In the specific content of the above specific embodiments, each technical feature can be combined arbitrarily without contradiction. For the sake of concise description, not all possible combinations of the above technical features are described. However, as long as the combinations of these technical features do not exist in contradiction, they should all be considered as the scope described in this specification.

[0042] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, rather than limiting the embodiments of the present invention. For those of ordinary skill in the art, other different forms of changes or modifications can be made on the basis of the above description. It is not necessary and impossible to enumerate all the embodiments here. Any modifications, equivalent replacements, and improvements made within the spirit and principle of the present invention shall be included in the protection scope of the claims of the present invention.

Claims

1. A rubber sealing ring forming mold, characterized in that: The invention comprises an upper mold plate (1), a middle mold plate (2), a lower mold plate (3), and an inner mold core (4); a mold cavity is provided between the upper mold plate (1), the middle mold plate (2), the lower mold plate (3) and the inner mold core (4); the lower mold plate (3) is provided with a matching protrusion (31) and a long guide column (22); the cross section of the matching protrusion (31) is a trapezoid with a lower bottom length greater than an upper bottom length; the middle mold plate (2) is provided with a through hole (21), and the through hole (21) is movably connected to the long guide column (22); the upper mold plate (1) is provided with a guide hole (11) matched with the long guide column (22); the inner mold core (4) is connected to the upper mold plate (1), and the inner mold core (4) is provided with a matching groove (41) matched with the matching protrusion (31).

2. A rubber sealing ring forming mold according to claim 1, characterized in that: A clearance fit is adopted between the through hole (21) and the long guide pillar (22), as well as between the guide hole (11) and the long guide pillar (22).

3. A rubber sealing ring forming mold according to claim 1, characterized in that: The lower template (3) is provided with a positioning groove (32) matched with the long guide column (22), and a positioning screw (33) connected with the long guide column (22) is provided in the positioning groove (32).

4. A rubber sealing ring forming mold according to claim 1, characterized in that: The matching protrusion (31) is in the shape of a circular ring and has an isosceles trapezoidal cross section.

5. The rubber sealing ring forming mold according to claim 1, characterized in that: The upper mold plate (1) is provided with a guide column (12), and the inner mold core (4) is provided with a guide sleeve (42) which is connected to the guide column (12); or the upper mold plate (1) is provided with a guide sleeve (42), and the inner mold core (4) is provided with a guide column (12) which is connected to the guide sleeve (42).

6. A rubber sealing ring forming mold according to claim 5, characterized in that: A plurality of evenly distributed springs (43) are provided between the inner mold core (4) and the upper mold plate (1), and a contour sleeve (13) for limiting the relative position of the upper mold plate (1) and the inner mold core (4) is provided on the upper mold plate (1).

7. A rubber sealing ring forming mold according to claim 5, characterized in that: The upper mold plate (1) is provided with an inner buckle insert (14) and a locking block (15), wherein the locking block (15) is arranged on the top of the inner buckle insert (14), one end of the inner buckle insert (14) protrudes from the inner mold core (4), and the distance that the inner buckle insert (14) protrudes from the inner mold core (4) is smaller than the travel of the guide column (12) in the guide sleeve (42).

8. A rubber sealing ring forming mold according to any one of claims 1 to 7, characterized in that: The middle template (2) is provided with an inner concave position (23), and the inner concave position (23) is connected to the mold cavity.

9. A rubber sealing ring forming mold according to any one of claims 1 to 7, characterized in that: A boosting block (24) is provided on the side wall of the middle template (2).

10. The rubber sealing ring forming mold according to claim 1, characterized in that: The parting surface between the middle template (2) and the upper template (1) and the parting surface between the middle template (2) and the lower template (3) are both provided with an annular tearing edge groove (34) and an exhaust groove (35).

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