Modular diameter adjustable internal rib spinning core and method of use

Abstract

The application discloses a modular diameter-adjustable inner-rib spinning core die and a use method, relates to the technical field of spinning devices, and comprises a guide rail, a center column, a core die main body and a telescopic mechanism. The core die main body comprises a plurality of module bodies, each module body is connected with the center column through the telescopic mechanism, the center column is arranged at the center position of the core die main body, and the upper and lower ends of the center column are respectively connected with disc guide rails. The guide rail provides a smooth moving path for the radial telescoping of the core die main body, and can also limit the axial movement of the core die main body. The telescopic mechanism can adjust the diameter of the core die main body. The application has the advantages of flexibility and adjustability. The modular design allows different parts of the core die to be designed and replaced separately, so as to adapt to the processing requirements of cylindrical parts with different shapes and sizes.

Description

Technical Field

[0001] This invention belongs to the field of spinning device technology, specifically relating to a modular, diameter-adjustable internal rib spinning mandrel and its usage method. Background Technology

[0002] Spinning technology, as an advanced point-load plastic forming method, has several advantages: it provides excellent metal deformation conditions, low cost and low raw material consumption, simple process, high precision, and superior product performance. This technology is suitable for processing various complex-shaped parts, such as cylindrical parts, variable cross-section tubes, rotating bodies with varying wall thicknesses or steps, and three-dimensional non-axisymmetric parts. It is widely used in the manufacturing fields of aerospace, weaponry, and automotive parts.

[0003] In manufacturing large-diameter, thin-walled, irregularly shaped cylindrical components, a common spinning method involves machining rib grooves on a core module that match the shape of the ribs in the cylindrical part. A spinning wheel applies a localized, continuous load to the cylindrical blank, causing the blank to fill radially at the rib grooves, forming a raised internal rib structure. However, for components with complex cross-sections and long longitudinal ribs, such as large-diameter, thin-walled, irregularly shaped cylindrical components in the aerospace field, the demolding process is challenging. Existing integrated core mold devices typically require significant axial force to separate the core mold from the formed workpiece during demolding, which can scratch the internal ribs or cause workpiece deformation. While split core molds can solve this problem, their assembly and disassembly processes are complex, especially when the core mold is large or heavy. This significantly increases the labor intensity of workers and reduces production efficiency, while also easily leading to mold wear and negatively impacting forming accuracy.

[0004] Existing spinning dies for internally ribbed parts are either integral or combinations of multiple manually disassembled dies. These generally suffer from problems such as difficulty in demolding the workpiece, each die set only being able to process one type of fixed-size part, and difficulty in processing stepped or circumferentially ribbed parts. Therefore, there is an urgent need for a spinning die that can improve the spinning of internally ribbed cylindrical parts, enabling automated operation without disassembling the core mold during demolding. This would increase production efficiency, maintain forming accuracy, and effectively solve problems such as demolding difficulties. Summary of the Invention

[0005] The purpose of this invention is to provide a modular, diameter-adjustable internal rib spinning mandrel and its usage method. It adopts a radial telescopic demolding method and a modular design, which eliminates the need to disassemble the mold during demolding. The radial movement of each module can be adjusted to generate radial clearance to achieve demolding, thereby overcoming the shortcomings of existing cylindrical internal rib spinning molds, such as poor practicality and difficult demolding.

[0006] To achieve the above objectives, the present invention implements the following technical solution: It includes guide rails, a central column, a core mold body, and a telescopic mechanism; the core mold body includes multiple modular bodies, each of which is connected to the central column via the telescopic mechanism. The central column is located at the center of the core mold body, and the upper and lower ends of the central column are respectively connected to guide rails; the guide rails provide a smooth movement path for the radial extension and retraction of the core mold body, while also restricting the axial movement of the core mold body. The telescopic mechanism can adjust the diameter of the core mold body.

[0007] The core mold body formed by splicing multiple modules is cylindrical. Each module is processed to form multiple grooves. The connection parts between the modules are processed into an arc structure so that the groove gap is formed when the modules are connected.

[0008] The upper end of the module is connected to the upper slider, and the lower end is connected to the lower slider.

[0009] The guide rail includes an upper circular guide rail and a lower circular guide rail, with the upper slider embedded in the upper circular guide rail and the lower slider embedded in the lower circular guide rail.

[0010] A hydraulic cylinder is installed on the side of the central column. The hydraulic cylinder is connected to one end of the piston connecting rod, and the other end of the piston connecting rod is connected to the module body.

[0011] The side of the central column is fixed with a hydraulic cylinder mounting seat by fastening bolts, and a hydraulic cylinder is connected to the hydraulic cylinder mounting seat.

[0012] The upper end of the central column is fixed to the upper circular guide rail, and the lower end is fixed to the lower circular guide rail.

[0013] The hydraulic cylinder has a right oil port pipe at one end near the central column and a left oil port pipe at the other end. An oil passage is opened at the bottom of the central column, which connects the left oil port pipe and the right oil port pipe. The oil supply and discharge of oil through different oil port pipes can realize the pushing and pulling action of the piston connecting rod, thereby providing driving force for the radial extension and retraction movement of the core mold body.

[0014] The diameters of the upper and lower circular guide rails are smaller than the diameter of the cylindrical shape of the module body splicing. Generally, the maximum diameter of the circular guide rail is designed to be the circumference diameter formed by the maximum distance that the core mold can move radially inward as a whole, so that when the core mold body shrinks radially inward, the formed inner rib cylindrical part can be taken out along the axial direction.

[0015] Furthermore, the present invention also provides a method for using a modular, diameter-adjustable internal rib spinning mandrel, comprising the following steps: Before spinning, install the core mold body on the spindle worktable and fix the core mold body in position; Based on the diameter of the cylindrical part, control the hydraulic oil in and out of the left and right oil ports to drive the piston connecting rod, and adjust the diameter of the core mold body to ensure a tight fit with the cylindrical part; During spinning, oil enters through the right oil port and exits through the left oil port, providing thrust to the hydraulic cylinder and supporting the module body to withstand the spinning force. After spinning is completed, the inner ribs of the cylindrical body are embedded in the grooves on the module body and the grooves formed by the connection of the module bodies. By controlling the oil inlet pipe on the left and the oil outlet pipe on the right, the piston connecting rod is driven to retract radially. The inner ribs of the cylindrical part and the core module body will generate a radial gap. The formed cylindrical part is then taken out along the axial direction of the core mold body.

[0016] Compared with the prior art, the present invention has the following beneficial technical effects: This invention provides a modular, diameter-adjustable internal rib spinning mandrel, offering advantages in flexibility and adjustability. The modular design allows for the individual design and replacement of different mandrel components to adapt to the processing needs of cylindrical parts of varying shapes and sizes. Operators can quickly adjust and replace modules according to specific workpiece requirements, thereby improving production flexibility and adaptability. The radially adjustable design of the telescopic structure can withstand high spinning pressure while quickly solving the demolding problem of cylindrical workpieces without disassembling the mandrel, reducing the impact and damage to the processed parts, minimizing downtime, and improving production efficiency. The modular design also reduces maintenance and replacement costs. Since only damaged or upgraded module components can be replaced, instead of replacing the entire mandrel, time and costs are saved. By controlling the telescopic mechanism inside the mandrel, it can automatically adjust according to changes in the shape and size of the processed parts during processing, enabling the processing of workpieces of different diameters.

[0017] This invention can obtain internal ribbed parts of different sizes and shapes by changing the number of modules and the grooves on the module surface. This invention can process special types of workpieces such as stepped types and those with circumferential ribs, and does not have the problem of blanks being stuck by traditional core molds. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of a modular, diameter-adjustable internal rib spinning mandrel structure according to an embodiment of the present invention.

[0019] Figure 2 This is a schematic diagram of the internal telescopic mechanism of the core mold in an embodiment of the present invention.

[0020] Figure 3 This is a schematic diagram of the core mold body from the side in an embodiment of the present invention.

[0021] Figure 4 This is a top view of the interior of the core mold in an embodiment of the present invention.

[0022] Figure 5 This is a top view of the core mold in an embodiment of the present invention.

[0023] Figure 6This is a schematic diagram of the cylindrical blank and the target workpiece in an embodiment of the present invention.

[0024] In the diagram, 1. Lower disc guide rail; 2. Lower slider; 3. Piston connecting rod; 4. Hydraulic cylinder; 5. Right oil port pipe; 6. Left oil port pipe; 7. Center column; 8. Module body; 9. Cylinder fixing seat; 10. Set screw assembly; 11. Upper slider; 12. Upper disc guide rail; 13. Groove; 14. Groove gap; 15. Oil passage. Detailed Implementation

[0025] To enable those skilled in the art to better understand the present invention, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort should fall within the scope of protection of the present invention.

[0026] It should be noted that the terms "first," "second," etc., in the specification, claims, and accompanying drawings of this invention are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of the invention described herein can be implemented in orders other than those illustrated or described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover a non-exclusive inclusion; for example, a process, method, system, product, or apparatus that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or apparatus.

[0027] Example 1 See Figures 1 to 3A modular, diameter-adjustable internal rib spinning mandrel includes a guide rail, a mandrel body, and a telescopic mechanism. The mandrel body comprises multiple modular bodies 8, each connected to the central column 7 via the telescopic mechanism. The central column 7 is positioned at the center of the mandrel body, with guide rails connected to its upper and lower ends. The guide rails provide a smooth radial extension and retraction path for the mandrel body while also restricting its axial movement. The telescopic mechanism adjusts the diameter of the mandrel body. Each modular body 8 is machined to form multiple grooves 13, and the connecting parts of the interlocking parts of each modular body 8 are machined into an arc-shaped structure to allow the modules to... When the bodies (8) are connected to each other, a groove gap 14 is formed; the upper end of the module body 8 is connected to the upper slider 11, and the lower end of the module body 8 is connected to the lower slider 2. The upper slider 11 and the lower slider 2 are respectively embedded in the sliding rails of the upper disc guide rail 12 and the lower disc guide rail 1, providing a smooth moving path for the radial extension and contraction of the core mold body, and also restricting the axial movement of the core mold body; the diameter of the upper disc guide rail 12 and the lower disc guide rail 1 is smaller than the diameter of the cylindrical shape spliced ​​by the module bodies 8. Generally, the maximum diameter of the disc guide rail is designed to be the circumference diameter formed by the maximum distance that the core mold body can move radially inward as a whole, so that when the core mold body shrinks radially inward, the formed inner rib cylindrical part can be taken out along the axial direction.

[0028] The telescopic mechanism inside the core mold body consists of multiple hydraulic cylinders arranged in a compact spatial layout. Hydraulic cylinders 4 are installed on all four sides of the central column 7. Each core mold body is equipped with two hydraulic cylinders 4 (upper and lower), providing uniform pushing and pulling force. One end of the hydraulic cylinder 4 is connected to the piston connecting rod 3, and the other end of the piston connecting rod 3 is threaded to the module body 8, thus connecting the module bodies 8 together to form the core mold body. A right oil port pipe 5 is provided at one end of the hydraulic cylinder 4 near the central column 7, and a left oil port pipe 6 is provided at the other end. An oil passage is opened at the bottom of the central column 7. 15. The oil passage 15 connects the right oil port pipe 5 and the left oil port pipe 6. The oil supply and discharge of different oil port pipes can realize the pushing and pulling action of the piston connecting rod 3, thereby providing driving force for the radial extension and retraction movement of the core mold body. Hydraulic oil enters from the oil passage 15. By supplying oil to the left oil port pipe 6 of the hydraulic cylinder and discharging oil to the right oil port pipe 5, the piston connecting rod 3 retracts, thereby causing the core mold body to retract radially inward. By discharging oil to the left oil port pipe 6 of the hydraulic cylinder and supplying oil to the right oil port pipe 5, the piston connecting rod 3 extends outward, thereby causing the core mold body to extend radially outward.

[0029] Example 2 See Figure 4Based on Embodiment 1, a modular adjustable diameter internal rib spinning mandrel includes a guide rail, a central column, a mandrel body, and a telescopic mechanism. The mandrel body is composed of four modular bodies 8, each of which is connected to the central column 7 via the telescopic mechanism. The central column 7 is located at the center of the mandrel body, and the upper and lower ends of the central column 7 are respectively connected to the guide rail. Each modular body 8 is machined with two grooves 13 in the shape of the formed internal rib, and the connection of each modular body 8 is also machined with the groove edge arc shape to form a groove gap 14 in the shape of the internal rib. The upper and lower surfaces of the modular body 8 are integrally machined with an upper slider 11 and a lower slider 2, respectively, and the two types of sliders are embedded in the sliding tracks of the upper circular guide rail 12 and the lower circular guide rail 1.

[0030] See Figures 1 to 6 The present invention also provides a method for using a modular, diameter-adjustable internal rib spinning mandrel, specifically including the following steps: Before spinning, install the core mold body on the spindle worktable and fix the core mold body in position; Based on the diameter of the cylindrical part, the hydraulic oil inlet and outlet of the left and right oil ports are controlled to drive the piston connecting rod, discharge oil to the left oil port of the hydraulic cylinder and supply oil to the right oil port, provide thrust to the hydraulic cylinder, push the piston connecting rod to extend radially, and drive the core mold body to extend radially outward along the slider track, thereby adjusting the diameter of the core mold body to make it fit tightly with the cylindrical part; During the spinning process, the hydraulic cylinder provides thrust to hold the module body in place and withstand the spinning force. After spinning is completed, the inner ribs of the cylindrical body are embedded in the grooves on the module body and the grooves formed by the connection of the module body. Oil is supplied to the left oil port of the hydraulic cylinder and discharged from the right oil port. The hydraulic pressure pushes the piston connecting rod to contract radially, which drives the core mold body to contract radially inward along the slider track. The inner ribs of the cylindrical part and the core module body will generate a radial gap. The formed cylindrical part is taken out along the core mold axis.

[0031] This invention eliminates the need to disassemble the core mold structure during demolding, improving production efficiency and continuous production capacity. By precisely controlling the radial expansion and contraction of the core mold body, the shape and dimensional accuracy of the processed parts can be ensured, reducing shape changes and dimensional errors caused by the demolding process.

[0032] This invention employs a radial telescopic demolding method and a modular design. Demolding does not require disassembly of the mold; the radial movement of each module can be adjusted to create radial clearance, achieving demolding. Furthermore, each module can be flexibly designed and upgraded to adapt to the processing requirements of parts with different internal rib shapes and sizes. This mandrel device improves the processing efficiency and quality of spinning internal ribs on cylindrical parts, effectively solving many problems in the demolding process of traditional mandrel spinning.

[0033] Obviously, the above embodiments are merely illustrative examples for clear explanation and are not intended to limit the implementation. Those skilled in the art will recognize that other variations or modifications can be made based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations here. However, obvious variations or modifications derived therefrom are still within the scope of protection of this invention.

Claims

1. A modular, diameter-adjustable internal rib spinning mandrel, characterized in that, It includes a guide rail, a central column (7), a core mold body and a telescopic mechanism; the core mold body includes multiple module bodies (8), each module body (8) is connected to the central column (7) through the telescopic mechanism, the central column (7) is set at the center of the core mold body, and the upper and lower ends of the central column (7) are respectively connected to the guide rail; Multiple grooves (13) are machined on each module (8); the connecting parts of the modules (8) that are connected to each other are machined into an arc-shaped structure so that a groove gap (14) is formed when the modules (8) are connected to each other. The upper end of the module body (8) is connected to the upper slider (11), and the lower end is connected to the lower slider (2). The guide rail includes an upper circular guide rail (12) and a lower circular guide rail (1). The upper slider (11) is embedded in the upper circular guide rail (12), and the lower slider (2) is embedded in the lower circular guide rail (1). A hydraulic cylinder (4) is installed on the side of the central column (7). The hydraulic cylinder (4) is connected to one end of the piston connecting rod (3), and the other end of the piston connecting rod (3) is connected to the module body (8).

2. The modular, diameter-adjustable internal rib spinning mandrel according to claim 1, characterized in that, The side of the central column (7) is fixed with a cylinder mounting seat (9) by a fastening screw assembly (10), and a hydraulic cylinder (4) is connected to the cylinder mounting seat (9).

3. A modular, diameter-adjustable internal rib spinning mandrel according to claim 1, characterized in that, The upper end of the central column (7) is fixed with an upper circular guide rail (12), and the lower end is fixed with a lower circular guide rail (1).

4. A modular, diameter-adjustable internal rib spinning mandrel according to claim 1, characterized in that, The hydraulic cylinder (4) has a right oil port pipe (5) at one end near the center column (7) and a left oil port pipe (6) at the other end. An oil passage (15) is opened at the bottom of the center column (7), and the oil passage (15) connects the right oil port pipe (5) and the left oil port pipe (6).

5. A modular, diameter-adjustable internal rib spinning mandrel according to claim 1, characterized in that, The diameters of the upper circular guide rail (12) and the lower circular guide rail (1) are smaller than the diameter of the cylindrical shape spliced ​​by the module body (8).

6. The method of using a modular, diameter-adjustable internal rib spinning mandrel as described in claim 1, characterized in that, Includes the following steps: According to the diameter of the cylindrical part, control the hydraulic oil in and out of the left oil port pipe (6) and the right oil port pipe (5) to drive the piston connecting rod (3), and adjust the diameter of the core mold body to make it fit tightly with the cylindrical part; During the spinning operation, oil enters through the right oil port pipe (5) and exits through the left oil port pipe (6), providing thrust to the hydraulic cylinder (4) and supporting the module body (8) to withstand the spinning force; After spinning is completed, oil is introduced through the left oil port pipe (6) and discharged through the right oil port pipe (5) to drive the piston connecting rod (3), causing the piston connecting rod (3) to contract radially. The inner rib of the cylindrical part and the module body (8) will generate a radial gap, and the formed cylindrical part is taken out along the axial direction of the core mold body.

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