CN223030191U - Rubber seal ring forming die - Google Patents

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, wherein a cavity is arranged among the upper mold plate, the middle mold plate, the lower mold plate and the inner mold core, the lower mold plate is provided with a matching bulge and a long guide post, the cross section of the matching bulge is trapezoid with the length of the lower bottom being longer than that of the upper bottom, the middle mold plate is provided with a through hole, the through hole is movably connected with the long guide post, the upper mold plate is provided with a guide hole matched with the long guide post, 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 bulge, coarse positioning among the mold plates is realized through matching among the long guide post, the guide hole and the through hole, accurate positioning is realized through the matching groove and the matching bulge, the matching precision among the molds is improved, and the problems of hard collision, scratch and the like among the molds are avoided.

Description

Rubber seal ring forming die

Technical Field

The utility model relates to the technical field of rubber molds, in particular to a rubber sealing ring forming mold.

Background

Rubber rings are widely applied in the field of modern machinery and are commonly used in various sealing structures. The production of large-scale bellows rubber seal often adopts vulcanizer compression molding, because its cross section shape is complicated, and is equipped with structures such as recess generally, and the cooperation positioning accuracy of mould is the important factor that influences product quality. In the prior art, for example, a rubber seal ring mould disclosed in the publication No. CN219294537U realizes three-plate mould pressing through the combined design of an upper mould, a middle mould and a lower mould, and the middle mould is easy to disassemble, assemble and position, and is convenient for demoulding of a rubber ring by combining an ejection mechanism, so that time and labor are saved, and the production efficiency is improved. However, when the die is used, the guide pillar is arranged at the lower die, the sleeve hole matched with the guide pillar is arranged at the middle die, the guide hole is arranged at the upper die to position the dies, the overall positioning accuracy is low, and the die damage problems such as die gnawing and scratch are easy to occur.

Disclosure of utility model

In order to solve the problems that the positioning accuracy of a rubber seal ring die is low and the die is easy to damage, the utility model provides the rubber seal ring forming die, the long guide post arranged on the lower die plate is roughly positioned through clearance fit between the guide hole of the upper die plate and the through hole of the middle die plate, and the die is precisely positioned through the fit groove on the inner die core and the trapezoidal fit bulge on the lower die plate after being attached, so that the overall positioning accuracy of the rubber seal ring die is improved, and the die damage is avoided.

In order to solve the technical problems, the utility model provides the following technical scheme:

The rubber sealing ring forming die comprises an upper die plate, a middle die plate, a lower die plate and an inner die core, wherein a cavity is formed among the upper die plate, the middle die plate, the lower die plate and the inner die core, the lower die plate is provided with a matching bulge and a long guide post, the cross section of the matching bulge is trapezoid with the length of the lower bottom being longer than that of the upper bottom, the middle die plate is provided with a through hole, the through hole is movably connected with the long guide post, the upper die plate is provided with a guide hole matched with the long guide post, the inner die core is connected with the upper die plate, and the inner die core is provided with a matching groove matched with the matching bulge.

The upper template, the middle template, the lower template and the inner die core form a cavity for forming the rubber ring die together, the lower template is provided with a long guide post, the long guide post penetrates through the through hole to be movably connected with the middle template, and the upper template is matched with the long guide post through a guide hole. When the dies are gradually close to each other and are matched with the matching grooves on the inner die cores by virtue of the matching protrusions on the lower die plates, the trapezoidal positioning protrusions can provide inclined planes for accurate positioning, the lower bottom length is larger than the upper bottom length, the matching grooves and the matching protrusions can smoothly finish matching, the two positioning modes are matched with each other, the positioning precision during die assembly is improved, and the problems of hard collision, scratch and the like between the dies damaging the surfaces of the dies are avoided.

Furthermore, clearance fit is adopted between the through hole and the long guide post and between the guide hole and the long guide post. The long guide posts are in clearance fit with the through holes and the guide holes, so that the long guide posts are prevented from being broken off in the middle template moving process while the coarse positioning function is achieved, and the reliability of movable connection between the long guide posts and the middle template is improved.

Further, a positioning groove matched with the long guide post is formed in the lower die plate, and a positioning screw connected with the long guide post is arranged in the positioning groove. The long guide post is fixed in the positioning groove by the positioning screw, so that the position of the long guide post on the lower die plate is prevented from shifting, and the positioning precision in the die opening and closing process is improved.

Further, the matching bulge is in a circular ring shape, and the cross section of the matching bulge is in an isosceles trapezoid shape. The cooperation arch is ring form and the cross section sets up to isosceles trapezoid, forms the surrounding type mating surface through the double inclined planes of isosceles trapezoid both sides, makes the cooperation precision between lower bolster and the centre form core higher, improves rubber circle shaping quality.

Further, the upper die plate is provided with a guide post, the inner die core is provided with a guide sleeve which is in fit connection with the guide post, or the upper die plate is provided with a guide sleeve, and the inner die core is provided with a guide post which is in fit connection with the guide sleeve. The guide post and the guide sleeve assist in guiding, and the inner die core is prevented from shaking or rotating in the die assembly process.

Further, a plurality of springs which are uniformly distributed are arranged between the inner mold core and the upper mold plate, and an equal-height sleeve for limiting the relative position of the upper mold plate and the inner mold core is arranged on the upper mold plate. When the die is opened, the upper die plate and the inner die core are lifted, the upper die plate and the inner die core are stably separated under the action of uniformly distributed springs, the sealing rubber ring is convenient to demould, the equal-height sleeve penetrates through the upper die plate and the inner die core, and when the inner die core and the upper die core are separated, the relative position between the upper die plate and the inner die core is limited, so that the surface of the upper die plate is prevented from being damaged during subsequent pressing due to overlarge separation distance.

Further, the upper die plate is provided with an inner buckle insert and a lock pressing block, the lock pressing block is arranged at the top of the inner buckle insert, one end of the inner buckle insert protrudes out of the inner die core, and the distance of the inner buckle insert protruding out of the inner die core is smaller than the movement stroke of the guide post in the guide sleeve. The locking pressing block can fix the position of the inner buckling insert, and ensures the molding precision of the rubber ring. The distance that the inner buckle insert protrudes out of the inner die core is smaller than the movement stroke of the guide post in the guide sleeve, so that the inner die core is prevented from being separated from the inner buckle insert all the time in the process of separating from the upper die plate, and the inner buckle insert structure is prevented from being damaged due to collision in the die assembly process.

Further, the middle template is provided with a concave position, and the concave position is positioned in the cavity. The concave position on the middle template enables the rubber ring to form a circumferential bulge, so that the formed rubber ring is driven to move integrally along with the middle template and separate from the lower template, and the demolding is facilitated.

Further, a boosting block is arranged on the side wall of the middle template. In the die sinking process, an air cylinder or an oil cylinder on the vulcanizing machine lifts the boosting block upwards, so that the middle die plate is convenient to control to move upwards along the long guide post, the middle die plate drives the rubber ring product to move, the middle die plate is stopped at a proper height after being separated from the lower die plate, and the rubber ring is taken out from the middle die plate manually.

Further, the parting surface between the middle template and the upper template and the middle template and the lower template are respectively provided with an annular tearing edge groove and an exhaust groove. The annular tear edge groove is arranged circumferentially around the cavity, and after rubber in the cavity is heated and expanded, excessive rubber overflows to the annular tear edge groove on the parting surface to form thinner process flash, so that the pressure maintaining performance and the molding compactness are improved. The exhaust grooves are distributed along the radial direction and extend outwards from the die cavity, and in the die assembly process, gas in the die cavity is exhausted along the exhaust grooves on the parting surface, so that the quality problems of edge deficiency, bubbles, unripeness and the like of the rubber ring product are avoided.

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

1. The mould is three-plate mould structure, utilizes long guide pillar collusion and adopts the thick orientation of clearance fit to fix a position between the template, and supplementary with the cooperation arch, the cooperation groove carries out the accurate positioning when the template is laminated, effectively avoids mould mating surface hard to touch the damage.

2. The inner mold core adopts a semi-movable core structure, the guide post and the guide sleeve are precisely guided to prevent rotation, and the inner mold core can be hung on the upper mold plate during mold opening, so that the reverse buckling position of the sealing ring is convenient for demolding.

3. The parting surface is provided with the annular edge tearing groove and the exhaust groove, the mold is easy to deflate after being closed, the inner layer sizing material overflows to the annular edge tearing groove after being heated and expanded, the process flash is thin, the pressure maintaining performance is good, and the molding compactness is more ideal.

Drawings

In order to more clearly illustrate the embodiments of the present utility model or the technical solutions in the prior art, the drawings required for the embodiments will be briefly described below, and it is apparent that the drawings in the following description are only some embodiments described in the present utility model, and other drawings may be obtained according to these drawings for a person having ordinary skill in the art.

FIG. 1 is a schematic diagram of a mold closing state of a rubber seal ring molding mold provided by the utility model;

FIG. 2 is a schematic diagram of a discharging state of a rubber seal ring forming die provided by the utility model;

FIG. 3 is a schematic diagram of an upward state of an opening of a rubber seal ring forming mold provided by the utility model;

FIG. 4 is a schematic diagram showing a fully opened state of a rubber seal ring forming die provided by the utility model;

fig. 5 is an exploded view of the rubber seal ring molding die provided by the utility model.

Reference numerals illustrate:

1. the upper template, 11, a guide hole, 12, a guide pillar, 13, an equal-height sleeve, 14, an inner buckle insert, 15, a lock pressing block, 2, an intermediate template, 21, a through hole, 22, a long guide pillar, 23, an inner concave position, 24, a boosting block, 3, a lower template, 31, a matched protrusion, 32, a positioning groove, 33, a positioning screw, 34, an annular tearing edge groove, 35, an exhaust groove, 4, an inner template core, 41, a matched groove, 42, a guide sleeve, 43 and a spring.

Detailed Description

The utility model is further described below in connection with the following detailed description. In which the drawings are for illustrative purposes only and are not intended to be construed as limiting the present patent, and in which certain elements of the drawings may be omitted, enlarged or reduced in order to better illustrate embodiments of the present utility model, and not to represent actual product dimensions, it will be understood by those skilled in the art that certain well-known structures in the drawings and descriptions thereof may be omitted.

In the description of the present utility model, it should be understood that, if there is an azimuth or positional relationship indicated by terms such as "upper", "lower", "left", "right", etc., which are based on the azimuth or positional relationship shown in the drawings, it is merely for convenience of describing the present utility model and simplifying the description, and it is not indicated or implied that the apparatus or elements referred to must have a specific azimuth, be constructed and operated in a specific azimuth, so that the terms describing the positional relationship in the drawings are merely for exemplary illustration and are not to be construed as limitations of the present patent, and that the specific meanings of the terms described above should be understood by those skilled in the art according to circumstances.

Example 1

As shown in fig. 1 and 2, the rubber seal ring forming die provided by the embodiment comprises an upper die plate 1, a middle die plate 2, a lower die plate 3 and an inner die core 4, wherein a cavity is arranged among the upper die plate 1, the middle die plate 2, the lower die plate 3 and the inner die core 4, a matching bulge 31 and a long guide post 22 are arranged on the lower die plate 3, the cross section of the matching bulge 31 is a trapezoid with the lower bottom length being larger than the upper bottom length, a through hole 21 is formed in the middle die plate 2 and is movably connected with the long guide post 22, a guide hole 11 matched with the long guide post 22 is formed in the upper die plate 1, the inner die core 4 is connected with the upper die plate 1, and a matching groove 41 matched with the matching bulge 31 is formed in the inner die core 4.

In the rubber ring production process, the middle template 2 is firstly controlled to approach the lower template 3 along the long guide post 22, and a storage cavity for placing rubber blanks is formed after the lower template 3 is attached to the middle template 2. After the rubber blanks are put into the mold, the upper mold plate 1 and the inner mold core 4 are continuously controlled to move downwards, the upper mold plate 1 firstly completes coarse guiding through the long guide posts 22, the guide holes 11 and the through holes 21 during descending, and then the matching grooves 41 on the inner mold core 4 are attached to the matching protrusions 31 on the lower mold plate 3, so that accurate positioning is completed. The matching bulge 31 is arranged into a trapezoid with the length of the lower bottom being longer than that of the upper bottom, compared with a rectangular bulge, the inclined plane matching formed on two sides of the trapezoid can provide more accurate positioning accuracy compared with the linear matching on two sides of the rectangular section, and the length of the lower bottom is longer than that of the upper bottom, so that the matching process of the matching bulge and the matching groove is smoother. To further improve the positioning accuracy, the fitting protrusion 31 may be provided in a circular ring shape and the cross-sectional shape may be provided in an isosceles trapezoid shape, and two symmetrical fitting slopes may be formed inside and outside the circular ring. And after the die assembly is completed, heating the die, quickly filling the die cavity with the rubber material through hot melting, and assembling and maintaining the pressure, so that the strip-shaped rubber blank is vulcanized and shaped into a rubber ring product.

Clearance fit is adopted between the through hole 21 and the long guide post 22, between the guide hole 11 and the long guide post 22 and between the positioning groove 32 and the long guide post 22, and the size of the clearance is controlled between 1.8mm and 2.2 mm. The long guide post 22 completes the rough positioning among the templates, prevents hard collision among the templates or scratch of the matching groove 41 and the matching bulge 31, influences the surface quality of the templates, and avoids burrs of products. The large clearance fit of 1.8mm to 2.2mm is adopted, the clearance larger than 1.8mm can continue a certain movable space of the middle template 2, the long guide posts 22 are prevented from being broken off in the moving process of the middle template 2, and meanwhile, the clearance is controlled to be smaller than 2.2mm, so that the integral positioning precision between the dies can be ensured.

Example two

As shown in fig. 2 and 3, the present embodiment is similar to the embodiment, except that the upper mold plate 1 of the present embodiment is provided with a guide post 12, the inner mold core 4 is provided with a guide sleeve 42, the guide post 12 is connected with the guide sleeve 42, the upper mold plate 1 is provided with the guide sleeve 42, and the guide post 12 which is arranged in the inner mold core and is in fit connection with the guide sleeve 42 can also realize guiding function. The guide post 12 and the guide sleeve 42 are used for guiding, so that the inner die core 4 is prevented from rotating in the die assembly process, the relative position of the inner die core 4 and the upper die plate 1 is fixed, and the quality stability of rubber ring product production is improved.

A plurality of springs 43 which are uniformly distributed are arranged between the inner die core 4 and the upper die plate 1, and a constant-height sleeve 13 for limiting the relative position of the upper die plate 1 and the inner die core 4 is arranged on the upper die plate 1. In the mold closing process, the inner mold core 4 and the upper mold plate 1 approach to the lower mold plate 3, the matching groove 41 is attached to the matching protrusion 31, the guide hole 11 is matched with the long guide post 22, and the spring 43 is in a compressed state. In the die sinking process after the rubber ring production is completed, the inner die core 4 and the upper die plate 1 are upwards moved to be separated from the rubber ring, the spring 43 is not pressed in the upwards moving process, the inner die core 4 is separated from the upper die plate 1 under the action of the spring 43, and the inner die core 4 is hung on the upper die plate 1 by means of the equal-height sleeve 13 to follow the upper die plate 1 to continue to upwards move. The inner mold core 4 adopts a semi-movable core structure, the inner mold core 4 can be hung on the upper mold plate 1 during mold opening, the upper mold plate 1 is separated from the inner mold core 4, enough demolding space can be provided for an inner buckling position on the rubber ring, the demolding difficulty is reduced, the reverse buckling position of the sealing ring is convenient for demolding, and the demolding time is saved.

As shown in fig. 3 and 4, the upper die plate 1 is provided with an inner buckle insert 14 and a lock pressing block 15, the lock pressing block 15 is arranged at the top of the inner buckle insert 14, and one end of the inner buckle insert 14 protrudes out of the upper die plate 1 and is sleeved in the inner die core 4. The inner buckle insert 14 is used for controlling the shape and the position of the inner buckle in the rubber ring forming process, and different inner buckle inserts 14 can be replaced according to production requirements. The lock pressing block 15 is arranged on the inner buckle insert 14 and is used for fixing the position of the inner buckle insert 14 and ensuring enough pressure in the die assembly process so as to improve the molding quality of the inner buckle of the rubber ring. When the inner buckle insert 14 is installed, the inner buckle insert 14 needs to be sleeved in the inner mold core 4, one end of the inner buckle insert protrudes out of the inner mold core 4, so that the shape of a cavity can be controlled in the forming process, and an inner buckle can be formed on a rubber ring. Meanwhile, the distance of the inner buckling insert 14 protruding out of the inner mold core 4 is smaller than the travel of the guide post 12 in the guide sleeve 42 when the inner mold core moves, so that the inner mold core 4 is not separated from the inner buckling insert 14 all the time in the moving process, and collision with the inner buckling insert 14 in the mold closing process of the inner mold core 4 is avoided.

Example III

As shown in fig. 5, the present embodiment is similar to the embodiment except that the parting plane between the middle die plate 2 and the upper die plate 1 and the middle die plate 2 and the lower die plate 3 of the present embodiment are provided with annular tear edge grooves 34 and vent grooves 35 perpendicular to the die opening direction. An annular tear edge groove 34 is provided circumferentially around the cavity to facilitate trimming of the rubber ring. In the rubber ring production process, the upper die plate 1, the middle die plate 2, the lower die plate 3 and the inner die core 4 are first subjected to die assembly, after die assembly is completed, the vulcanizing machine heats the die plates, rubber materials are heated and melted to quickly fill the die cavities, redundant rubber materials flow into the annular edge tearing grooves 34 along the parting surfaces, the formed process flash is thin, meanwhile, the pressure maintaining performance of the die cavities is good, the molding compactness of the rubber ring is improved, and the surplus materials are conveniently removed in the subsequent processing process. The exhaust grooves 35 are distributed along the radial direction and extend from the cavity to the outer side of the die, in the forming process, the vulcanizing machine drives the upper die plate 1 to slightly lift and press down for a plurality of times, so that gas in the cavity is conveniently exhausted, and redundant sizing materials drill out of the cavity through the exhaust grooves 35. After the exhaust is finished, the die is assembled and the pressure is maintained, the positions of the templates are controlled to be unchanged, and (5) vulcanizing and shaping the sealing ring. The exhaust groove 35 can assist the escape of gas in the cavity in the mold closing and forming process, so that the problems of gas rolling, bubbles and the like of products are avoided.

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 molded in the cavity, and a circumferential bulge is formed at the concave position 23. After the die assembly is completed, the middle die plate 2 moves upwards along the long guide post 22, the whole rubber ring is driven to be separated from the lower die plate 3 under the action of the concave position 23, then the middle die plate 2 is stopped at a proper height, and the rubber ring product is taken out manually. The boosting blocks 24 are uniformly arranged on the side surface of the middle die plate 2 in a plurality of groups so as to ensure the stability of the movement of the middle die plate 2. In the mold closing process, an air cylinder or an oil cylinder on the vulcanizing machine presses the boosting block 24 downwards to drive the middle mold plate 2 to approach the lower mold plate 3 steadily, and in the mold opening process, the air cylinder or the oil cylinder jacks up the boosting block 24 to drive the middle mold plate 2 to be separated from the lower mold plate 3, so that the rubber ring product is conveniently taken out.

In the specific content of the above embodiment, any combination of the technical features may be performed without contradiction, and for brevity of description, all possible combinations of the technical features are not described, however, as long as there is no contradiction between the combinations of the technical features, they should be considered as the scope of the description.

It is to be understood that the above examples of the present utility model are provided by way of illustration only and not by way of limitation of the embodiments of the present utility model. Other variations or modifications of the above teachings will be apparent to those of ordinary skill in the art. It is not necessary here nor is it exhaustive of all embodiments. Any modification, equivalent replacement, improvement, etc. which come within the spirit and principles of the utility model are desired to be protected by the following claims.

Claims (10)

1. The rubber sealing ring forming die is characterized by comprising an upper die plate (1), a middle die plate (2), a lower die plate (3) and an inner die core (4), wherein a cavity is arranged among the upper die plate (1), the middle die plate (2), the lower die plate (3) and the inner die core (4), a matching bulge (31) and a long guide post (22) are arranged on the lower die plate (3), the cross section of the matching bulge (31) is a trapezoid with the lower bottom length being larger than the upper bottom length, the middle die plate (2) is provided with a through hole (21), the through hole (21) is movably connected with the long guide post (22), the upper die plate (1) is provided with a guide hole (11) matched with the long guide post (22), the inner die core (4) is connected with the upper die plate (1), and a matching groove (41) matched with the matching bulge (31) is arranged on the inner die core (4).

2. A rubber sealing ring forming die according to claim 1, wherein clearance fit is adopted between the through hole (21) and the long guide post (22) and between the guide hole (11) and the long guide post (22).

3. The rubber sealing ring forming die according to claim 1, wherein a positioning groove (32) matched with the long guide post (22) is formed in the lower die plate (3), and a positioning screw (33) connected with the long guide post (22) is arranged in the positioning groove (32).

4. A rubber seal ring forming die as claimed in claim 1, wherein the mating protrusion (31) is circular and has an isosceles trapezoid cross section.

5. The rubber sealing ring forming die according to claim 1, wherein the upper die plate (1) is provided with a guide post (12), the inner die core (4) is provided with a guide sleeve (42) which is in matched connection with the guide post (12), or the upper die plate (1) is provided with the guide sleeve (42), and the inner die core (4) is provided with the guide post (12) which is in matched connection with the guide sleeve (42).

6. The rubber sealing ring forming die according to claim 5, wherein a plurality of springs (43) which are uniformly distributed are arranged between the inner die core (4) and the upper die plate (1), and a contour sleeve (13) for limiting the relative position of the upper die plate (1) and the inner die core (4) is arranged on the upper die plate (1).

7. The rubber seal ring forming die according to claim 5, wherein the upper die plate (1) is provided with an inner buckle insert (14) and a lock pressing block (15), the lock pressing block (15) is arranged at the top of the inner buckle insert (14), one end of the inner buckle insert (14) protrudes out of the inner die core (4), and the distance that the inner buckle insert (14) protrudes out of the inner die core (4) is smaller than the movement stroke of the guide pillar (12) in the guide sleeve (42).

8. A rubber seal ring forming die according to any one of claims 1 to 7, wherein the middle die (2) is provided with a concave position (23), and the concave position (23) is communicated with the die cavity.

9. A rubber sealing ring forming die according to any one of claims 1 to 7, wherein a boosting block (24) is arranged on the side wall of the middle die plate (2).

10. The rubber sealing ring forming die according to claim 1, wherein annular tearing edge grooves (34) and exhaust grooves (35) are formed in a parting surface between the middle die plate (2) and the upper die plate (1) and a parting surface between the middle die plate (2) and the lower die plate (3).