Demoulding structure forming mould for underground special-shaped fluororubber cylinder
By improving the mold structure and adopting a mold with specific materials and mating surface design for the demolding structure of the underground irregular fluororubber cylinder, the problems of brittle fracture, unstable molding quality and demolding difficulty in the production of irregular fluororubber cylinders have been solved, and an efficient and stable production process has been achieved.
Patent Information
- Application Number
- CN202520191327.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-02-07
- Publication Date
- 2026-01-27
- Estimated Expiration
- 2035-02-07
AI Technical Summary
Existing molds have problems such as brittle fracture of rubber material, low production efficiency, high cost, unstable molding quality and difficulty in demolding when producing irregularly shaped fluororubber cylinders. In particular, it is difficult to achieve efficient production in high-temperature environments.
A demolding structure molding die for downhole irregular fluororubber cylinders was designed. The die uses specific materials and mating surface designs for the upper mold, middle mold, lower mold, and core mold. Combined with the external protrusions and segmented structure of the core mold, it ensures accurate positioning and easy demolding, avoids gas residue, and improves molding accuracy and demolding efficiency.
It significantly improves the molding quality and demolding efficiency of irregularly shaped fluororubber cylinders, reduces the risk of product damage, increases production efficiency and product qualification rate, and meets the high-standard requirements of downhole operations.
Smart Images
Figure CN223835007U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of mold technology, specifically to a mold for forming a demolding structure of an underground irregular fluororubber cylinder. Background Technology
[0002] In downhole operations, fluororubber sleeves, thanks to the superior high-temperature resistance and chemical corrosion resistance of fluororubber, can effectively cope with the complex and harsh working environment downhole, and are therefore widely used. Influenced by a combination of factors, including downhole tool structural design, fluororubber sleeves are typically designed with a unique structure that is symmetrical at both ends and irregularly shaped in the middle. This special structure is of great significance in downhole operations. It not only facilitates tool setting operations but also allows the sleeve to achieve a more ideal expansion effect under compression. Furthermore, the expanded annular surface can be precisely intervened and controlled according to the design intent.
[0003] However, in the manufacturing process of irregularly shaped fluororubber cylinders, the molding die has become a key factor restricting the improvement of production efficiency and product quality. Traditional die structures have revealed many defects when dealing with the complex shapes of irregularly shaped fluororubber cylinders.
[0004] The shortcomings of existing technology are:
[0005] 1. When processing fluororubber cylinders with special contours and dimensional variations, the thorny problem of the rubber compound being prone to brittle fracture at high temperatures is often encountered. If the option is to wait for the product to cool naturally, it will consume a lot of time and cost, seriously affecting production efficiency; while the solution of cooling the mold through runner design will lead to a significant increase in production costs, putting the product at a disadvantage in market competition.
[0006] 2. Existing molds have shortcomings in their multi-core mold structure design, making it difficult to ensure precise fit between the core molds. Inaccurate connection and positioning between core molds directly negatively impacts the molding quality and dimensional accuracy of the rubber cylinder, resulting in inconsistent product quality. More seriously, if the mold structure hinders demolding after the rubber cylinder is molded, it will trigger a series of chain reactions. This will not only significantly extend the production cycle and increase production costs, but also easily damage the rubber cylinder during demolding, leading to a substantial reduction in product qualification rate, wasted resources, and decreased production efficiency. Summary of the Invention
[0007] This utility model addresses the aforementioned problems by providing a molding die for the demolding structure of irregularly shaped fluororubber cylinders for underground operations. Its purpose is to improve the molding quality of irregularly shaped fluororubber cylinders and significantly enhance demolding efficiency, thereby better meeting the stringent and high standards required for fluororubber cylinders in underground operations and providing a solid guarantee for the safe and efficient conduct of underground operations.
[0008] To solve the above problems, the technical solution provided by this utility model is as follows:
[0009] A molding die for the demolding structure of a downhole shaped fluororubber cylinder includes an upper mold, a middle mold, a lower mold, and a core mold, wherein:
[0010] The upper mold and the lower mold have the same structure and dimensions, and are symmetrically arranged above and below the mold, respectively; the middle mold is located in the middle of the mold; the two ends of the middle mold are symmetrical and have the same dimensions; the core mold is located in the middle of the mold and is located inside the middle mold; the outer ring of the upper mold has a downwardly protruding upper mold outer ring mating surface at the contact position with the middle mold; the inner ring of the upper mold has an upwardly concave upper mold inner ring mating surface at the contact position with the core mold; the outer ring of the lower mold has an upwardly protruding lower mold outer ring mating surface at the contact position with the middle mold; the inner ring of the lower mold has a downwardly concave lower mold inner ring mating surface at the contact position with the core mold; the upper and lower ends of the interior of the middle mold are respectively provided with middle mold mating surfaces that match the contact position structure of the upper mold and the lower mold; the outer ring mating surfaces of the upper mold and the lower mold respectively mate with the middle mold mating surfaces to fix the mold; the inner ring mating surfaces of the upper mold and the lower mold respectively mate with the core mold to fix the mold.
[0011] Preferably, the core mold comprises an upper core mold, a middle core mold, and a lower core mold, wherein:
[0012] The upper core mold, the middle core mold, and the lower core mold are assembled together from top to bottom;
[0013] The upper inner ring of the upper core mold is provided with an upper core mold mating surface for mating with the inner ring of the upper mold to fix the mold; the lower end of the upper core mold is provided with an upper core mold boss; the upper core mold boss is used to lock with the middle core mold to prevent the middle core mold from shifting and causing the inner diameter of the product to be eccentric.
[0014] The lower inner ring of the lower core mold is provided with a lower core mold mating surface for mating with the inner ring of the lower mold to fix the mold; the upper end of the lower core mold is provided with a lower core mold boss; the lower core mold boss is used to lock with the middle core mold to prevent the middle core mold from shifting and causing the inner diameter of the product to be eccentric.
[0015] The core mold is an outwardly protruding annular structure; the core mold is symmetrically divided into 8 segments along the horizontal axis; the upper and lower end faces of the core mold are respectively provided with grooves; the grooves are used to match the upper core mold boss and the lower core mold boss respectively to fix the mold core.
[0016] Preferably, the upper core mold is a solid structure.
[0017] Preferably, the lower core mold has a hollow structure.
[0018] Preferably, the upper mold, the middle mold, the lower mold, the upper core mold, the middle core mold, and the lower core mold are made of hot-dip galvanized steel, wear-resistant steel, or carbon steel.
[0019] Preferably, the angle between the mating surface of the outer ring of the upper mold and the vertical direction is 15 degrees, and the depth is 10mm to 5mm; the angle between the mating surface of the outer ring of the lower mold and the vertical direction is 15 degrees, and the depth is 10mm to 5mm; the angle between the mating surface of the inner ring of the upper mold and the vertical direction is 15 degrees, and the depth is 10mm to 5mm; the angle between the mating surface of the inner ring of the lower mold and the vertical direction is 15 degrees, and the depth is 10mm to 5mm; the angle between the mating surface of the middle mold and the vertical direction is 15 degrees, and the depth is 10mm to 5mm.
[0020] Preferably, a platform is provided at the top of the 15-degree slope of the mating surface of the middle mold at both the upper and lower ends of the middle mold; the platform is provided with an outwardly protruding semi-circular structure near the inner ring of the upper mold and the inner ring of the lower mold; the semi-circular structure is used to guide and exhaust air at the outer circle of the product after the product is glued.
[0021] Preferably, the platform has a length of 10mm and the semicircular structure has a radius of 2mm.
[0022] Preferably, the upper core mold boss, the lower core mold boss, and the groove are trapezoidal in shape.
[0023] Compared with the prior art, this utility model has the following advantages:
[0024] 1. Because the upper mold, middle mold, upper core mold and lower core mold of this utility model are made of specific materials and have a unique mating surface design, not only can the connection of each mold component be stable, but also the air can be effectively guided and vented, which greatly improves the accuracy of rubber cylinder molding and effectively avoids dimensional deviations and molding defects caused by unstable mold structure or gas residue. It is significantly better than the product quality problems that often occur in the prior art due to poor mold fit.
[0025] 2. Because the core mold of this invention adopts an external protrusion and segmented structure, it ensures accurate positioning during the molding process and allows for appropriate deformation based on the demolding force during demolding, thus smoothly separating from the rubber cylinder. Compared with existing mold structures that are difficult to demold and easily damage the product, this invention significantly improves demolding efficiency and reduces the risk of product damage.
[0026] 3. Because the upper and lower core molds of this invention are tightly locked to the middle core mold via trapezoidal bosses and other bosses respectively, the problem of product inner diameter eccentricity caused by displacement of the middle core mold is effectively prevented. The solid structure of the upper core mold facilitates product ejection during demolding, while the hollow structure of the lower core mold provides convenience for demolding tooling operations. This collaborative design between core molds makes the entire mold system more stable and reliable during the molding process. Compared with the existing technology where the core mold fit is inaccurate and inner diameter deviations are prone to occur, this invention significantly improves product dimensional consistency and quality stability. Attached Figure Description
[0027] Figure 1 This is a schematic diagram of the demolding structure of a downhole irregular-shaped fluororubber cylinder according to a specific embodiment of this utility model;
[0028] Figure 2 This is a front view schematic diagram of a key component of the core mold in a specific embodiment of this utility model;
[0029] Figure 3 This is a schematic cross-sectional view of a key component of the core mold in a specific embodiment of this utility model.
[0030] Among them: 1. Upper mold, 2. Middle mold, 3. Lower mold, 4. Core mold, 1.1. Upper mold outer ring mating surface, 1.2. Upper mold inner ring mating surface, 3.1. Lower mold outer ring mating surface, 3.2. Lower mold inner ring mating surface, 2.1. Middle mold mating surface, 4.1. Upper core mold, 4.2. Middle core mold, 4.3. Lower core mold, 4.1.1. Upper core mold mating surface, 4.1.2. Upper core mold boss, 4.3.1. Lower core mold mating surface, 4.3.2. Lower core mold boss, 4.2.1. Groove, 2.2. Platform, 2.3. Semi-circular structure Detailed Implementation
[0031] The present invention will be further illustrated below with reference to specific embodiments. It should be understood that these embodiments are only for illustrating the present invention and are not intended to limit the scope of the present invention. After reading the present invention, any modifications of the present invention in various equivalent forms by those skilled in the art will fall within the scope defined by the appended claims.
[0032] like Figure 1 As shown, a molding die for a demolding structure of an irregularly shaped fluororubber cylinder for underground drilling includes an upper mold 1, a middle mold 2, a lower mold 3, and a core mold 4, wherein:
[0033] The upper mold 1 and lower mold 3 have the same structure and dimensions, and are symmetrically arranged above and below the mold, respectively; the middle mold 2 is located in the middle of the mold; the two ends of the middle mold 2 are symmetrical and have the same dimensions; the core mold 4 is located in the middle of the mold and inside the middle mold 2; the contact position between the outer ring of the upper mold 1 and the middle mold 2 is provided with a downwardly protruding upper mold outer ring mating surface 1.1; the contact position between the inner ring of the upper mold 1 and the core mold 4 is provided with an upwardly recessed upper mold inner ring mating surface 1.2; the contact position between the outer ring of the lower mold 3 and the middle mold 2 is provided with an upwardly protruding lower mold outer ring mating surface 3.1; the lower mold 3... The inner ring of the mold 2 has a recessed inner ring mating surface 3.2 at the contact position with the core mold 4; the upper and lower ends of the inner mold 2 are respectively provided with middle mold mating surfaces 2.1 that match the contact position structure of the upper mold 1 and the lower mold 3; the outer ring mating surface 1.1 of the upper mold and the outer ring mating surface 3.1 of the lower mold respectively mate with the middle mold mating surface 2.1 to fix the mold, so that the various parts of the mold are tightly connected and the mold is stably assembled; the inner ring mating surface 1.2 of the upper mold and the inner ring mating surface 3.2 of the lower mold respectively mate with the core mold 4 to fix the mold and ensure the stability of the internal structure of the mold.
[0034] It should be noted that the upper mold 1 and the lower mold 3 have the same structure and size, and are symmetrically set respectively; the two ends of the middle mold 2 are symmetrical and have the same size; this is to ensure that the rubber material is subjected to uniform force and that the irregular parts are compatible with the molding process.
[0035] It should be noted that core mold 4 includes upper core mold 4.1, middle core mold 4.2, and lower core mold 4.3, wherein:
[0036] The upper core mold 4.1, the middle core mold 4.2, and the lower core mold 4.3 are assembled together from top to bottom.
[0037] The upper inner ring of the upper core mold 4.1 is provided with an upper core mold mating surface 4.1.1 for mating with the mating surface 1.2 of the upper mold inner ring to fix the mold; the lower end of the upper core mold 4.1 is provided with an upper core mold boss 4.1.2; the upper core mold boss 4.1.2 is used to lock with the middle core mold 4.2 to prevent the middle core mold 4.2 from shifting and causing the inner diameter of the product to be eccentric.
[0038] The lower inner ring of the lower core mold 4.3 is provided with a lower core mold mating surface 4.3.1 for mating with the lower mold inner ring mating surface 3.2 to fix the mold; the upper end of the lower core mold 4.3 is provided with a lower core mold boss 4.3.2; the lower core mold boss 4.3.2 is used to lock with the middle core mold 4.2 to prevent the middle core mold 4.2 from shifting and causing the inner diameter of the product to be eccentric, and to avoid the core mold shifting and affecting the molding quality and precision.
[0039] like Figure 2 , 3As shown, the core mold 4.2 is an outwardly protruding annular structure; the core mold 4.2 is symmetrically divided into 8 segments along the horizontal axis; the upper and lower end faces of the core mold 4.2 are respectively provided with grooves 4.2.1; the grooves 4.2.1 are used to match the upper core mold boss 4.1.2 and the lower core mold boss 4.3.2 to fix the mold core, ensuring that the core mold can be demolded and deformed, while ensuring its positioning accuracy during the molding process, and improving the molding quality and dimensional accuracy stability of the fluororubber tube.
[0040] It should be further explained that the upper core mold 4.1 has a solid structure, which makes it easy for the product to be ejected through the solid part when it is demolded.
[0041] It should be further explained that the lower core mold 4.3 is a hollow structure, which facilitates the ejection of the product. When the upper core mold 4.1 is ejected first, the tooling can pass through the hollow part to place the ejector pin.
[0042] It should be further explained that the core mold 4.2 adopts an annular slit design. During demolding, the slit deforms according to the demolding force, which helps the rubber cylinder and the core mold to separate smoothly, reducing demolding difficulty and damage risk, improving product qualification rate and reducing costs.
[0043] It should be further explained that the coordinated operation of each component effectively avoids the problem of the rubber material becoming brittle and breaking off during demolding due to high temperature. It eliminates the need for high-cost flow channel cooling, enhances the core mold fitting accuracy and demolding effectiveness, and provides a stable supply of high-quality fluororubber cylinder products for downhole operations.
[0044] It should be noted that the upper mold 1, middle mold 2, lower mold 3, upper core mold 4.1, middle core mold 4.2 and lower core mold 4.3 are made of hot-dip galvanized steel, wear-resistant steel or carbon steel.
[0045] In this specific embodiment, the angle between the mating surface 1.1 of the upper mold outer ring and the vertical direction is 15 degrees, and the depth is 10mm to 5mm; the angle between the mating surface 3.1 of the lower mold outer ring and the vertical direction is 15 degrees, and the depth is 10mm to 5mm; the angle between the mating surface 1.2 of the upper mold inner ring and the vertical direction is 15 degrees, and the depth is 10mm to 5mm; the angle between the mating surface 3.2 of the lower mold inner ring and the vertical direction is 15 degrees, and the depth is 10mm to 5mm; the angle between the mating surface 2.1 of the middle mold and the vertical direction is 15 degrees, and the depth is 10mm to 5mm.
[0046] It should be noted that the top of the 15-degree slope of the middle mold mating surface 2.1 at both the upper and lower ends of the middle mold 2 is provided with a platform 2.2; the platform 2.2 is provided with an outwardly protruding semi-circular structure 2.3 near the inner ring of the upper mold 1 and the inner ring of the lower mold 3; the semi-circular structure 2.3 is used to guide and exhaust air at the outer circle of the product after the product is pressed with glue, effectively avoiding product molding defects caused by gas residue, and ensuring the molding quality of the product in the corresponding part of the middle mold 2.
[0047] In this specific embodiment, the length of platform 2.2 is 10mm; the radius of the semi-circular structure 2.3 is 2mm.
[0048] In the above detailed description, various features are combined together in a single embodiment to simplify this disclosure. This approach to disclosure should not be construed as reflecting an intention that embodiments of the claimed subject matter require more features than are explicitly stated in each claim. Rather, as reflected in the appended claims, the present invention is in a state with fewer features than all of the disclosed individual embodiments. Therefore, the appended claims are hereby clearly incorporated into the detailed description, wherein each claim stands alone as a preferred embodiment of the present invention.
[0049] The disclosed embodiments have been described above to enable any person skilled in the art to implement or use this invention. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein can be applied to other embodiments without departing from the spirit and scope of this disclosure. Therefore, this disclosure is not limited to the embodiments given herein, but is consistent with the widest scope of the principles and novel features disclosed in this application.
[0050] The foregoing description includes examples of one or more embodiments. It is certainly impossible to describe all possible combinations of components or methods in order to describe the above embodiments, but those skilled in the art will recognize that further combinations and arrangements of the various embodiments are possible. Therefore, the embodiments described herein are intended to cover all such changes, modifications, and variations that fall within the scope of the appended claims. Furthermore, the term "comprising" as used in the specification or claims is interpreted in a manner similar to the term "including," as interpreted when used as a conjunction in the claims. Additionally, the use of any term "or" in the specification of the claims is intended to mean "non-exclusive or."
[0051] The specific embodiments described above further illustrate the purpose, technical solution, and beneficial effects of this utility model. It should be understood that the above description is only a specific embodiment of this utility model and is not intended to limit the scope of protection of this utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the scope of protection of this utility model.
Claims
1. A mold for forming a demolding structure of an irregularly shaped fluororubber cylinder for underground drilling, characterized in that: It includes an upper mold (1), a middle mold (2), a lower mold (3), and a core mold (4), wherein: The upper mold (1) and the lower mold (3) have the same structure and size, and are symmetrically arranged above and below the mold, respectively; the middle mold (2) is located in the middle of the mold; the two ends of the middle mold (2) are symmetrical and have the same size; the core mold (4) is located in the middle of the mold and is located inside the middle mold (2); the outer ring of the upper mold (1) has a downwardly protruding upper mold outer ring mating surface (1.1) at the contact position with the middle mold (2); the inner ring of the upper mold (1) has an upwardly concave upper mold inner ring mating surface (1.2) at the contact position with the core mold (4); the outer ring of the lower mold (3) has a... The lower mold has an upwardly protruding outer ring mating surface (3.1); the inner ring of the lower mold (3) has a downwardly recessed inner ring mating surface (3.2) at the contact position with the core mold (4); the upper and lower ends of the inner cavity of the middle mold (2) are respectively provided with middle mold mating surfaces (2.1) that match the contact position structure of the upper mold (1) and the lower mold (3); the outer ring mating surface (1.1) of the upper mold and the outer ring mating surface (3.1) of the lower mold respectively mate with the middle mold mating surface (2.1) to fix the mold; the inner ring mating surface (1.2) of the upper mold and the inner ring mating surface (3.2) of the lower mold respectively mate with the core mold (4) to fix the mold.
2. The mold for forming the demolding structure of the downhole irregular fluororubber cylinder according to claim 1, characterized in that: The core mold (4) comprises an upper core mold (4.1), a middle core mold (4.2), and a lower core mold (4.3), wherein: The upper core mold (4.1), the middle core mold (4.2), and the lower core mold (4.3) are assembled together from top to bottom; The upper inner ring of the upper core mold (4.1) is provided with an upper core mold mating surface (4.1.1) for mating with the inner ring mating surface (1.2) of the upper mold to fix the mold; the lower end of the upper core mold (4.1) is provided with an upper core mold boss (4.1.2); the upper core mold boss (4.1.2) is used to lock with the middle core mold (4.2) to prevent the middle core mold (4.2) from shifting and causing the inner diameter of the product to be eccentric; The lower inner ring of the lower core mold (4.3) is provided with a lower core mold mating surface (4.3.1) for mating with the lower mold inner ring mating surface (3.2) to fix the mold; the upper end of the lower core mold (4.3) is provided with a lower core mold boss (4.3.2); the lower core mold boss (4.3.2) is used to lock with the middle core mold (4.2) to prevent the middle core mold (4.2) from shifting and causing the inner diameter of the product to be eccentric; The core mold (4.2) is an outwardly protruding annular structure; the core mold (4.2) is symmetrically divided into 8 segments along the horizontal axis; the upper and lower end faces of the core mold (4.2) are respectively provided with grooves (4.2.1); the grooves (4.2.1) are used to match the upper core mold boss (4.1.2) and the lower core mold boss (4.3.2) to fix the mold core.
3. The mold for forming the demolding structure of the downhole irregular fluororubber cylinder according to claim 2, characterized in that: The upper core mold (4.1) is a solid structure.
4. The mold for forming the demolding structure of the downhole irregular fluororubber cylinder according to claim 2, characterized in that: The lower core mold (4.3) is a hollow structure.
5. The mold for forming the demolding structure of the downhole irregular fluororubber cylinder according to claim 4, characterized in that: The upper mold (1), the middle mold (2), the lower mold (3), the upper core mold (4.1), the middle core mold (4.2), and the lower core mold (4.3) are made of hot-dip galvanized steel, wear-resistant steel, or carbon steel.
6. The mold for forming the demolding structure of the downhole irregular fluororubber cylinder according to claim 5, characterized in that: The outer ring mating surface (1.1) of the upper mold has an angle of 15 degrees with the vertical direction and a depth of 10mm to 5mm; the outer ring mating surface (3.1) of the lower mold has an angle of 15 degrees with the vertical direction and a depth of 10mm to 5mm; the inner ring mating surface (1.2) of the upper mold has an angle of 15 degrees with the vertical direction and a depth of 10mm to 5mm; the inner ring mating surface (3.2) of the lower mold has an angle of 15 degrees with the vertical direction and a depth of 10mm to 5mm; the mating surface (2.1) of the middle mold has an angle of 15 degrees with the vertical direction and a depth of 10mm to 5mm.
7. The mold for forming the demolding structure of the downhole irregular fluororubber cylinder according to claim 6, characterized in that: Platforms (2.2) are provided at the top of the 15-degree slope of the mating surface (2.1) of the middle mold (2) at both ends of the middle mold (2); the platform (2.2) is provided with an outwardly protruding semi-circular structure (2.3) near the inner ring of the upper mold (1) and the inner ring of the lower mold (3); the semi-circular structure (2.3) is used to guide and exhaust air at the outer circle of the product after the product is glued.
8. The mold for forming the demolding structure of the downhole irregular fluororubber cylinder according to claim 7, characterized in that: The platform (2.2) has a length of 10 mm; the semi-circular structure (2.3) has a radius of 2 mm.
9. The mold for forming the demolding structure of the downhole irregular fluororubber cylinder according to claim 8, characterized in that: The upper core mold boss (4.1.2), the lower core mold boss (4.3.2), and the groove (4.2.1) are trapezoidal in shape.