A device for making a variable diameter ring round

Abstract

This utility model discloses a device for rounding a variable-diameter ring. The device includes a conical expansion core, with a compression nut, a pressure block assembly, and a segmented conical block assembly sleeved on its outer side from top to bottom. The conical expansion core has a cone with a protrusion in the middle. The segmented conical block has multiple sets of shaping rings and internal grooves, which are pressed by first and second annular compression springs and form a double positioning with the conical expansion core protrusion and the pressure block spacer. A rotating push rod drives the compression nut to move down, pushing the segmented conical block to expand along the cone. After multiple pre-shaping and one final shaping, the ring is rounded. This device has a small roundness error, is easy to operate, and is suitable for aerospace, medical device and other fields.

Description

Technical Field

[0001] This utility model relates to a device for making a variable diameter ring round. Background Technology

[0002] Currently, annular, small-diameter, thin-walled catheters are widely used in aerospace, medical device, and automotive industries due to their high pressure resistance and good corrosion resistance. The manufacturing process for these catheters requires welding of bent tubing. However, because the misalignment requirements at the catheter joints are extremely high, the catheter is typically welded into an elliptical ring first, and then corrected into a standard circular ring through a rounding process.

[0003] Due to the poor rigidity of the parts and the high requirements for machining accuracy, existing rounding tooling usually uses a fixed-size integral mandrel or a small number of adjustable internal support blocks. It lacks a unified circumferential positioning and axial limiting reference, and is mostly a single-stage diameter expansion forming process. In the process of rounding workpieces with high precision requirements and thin-walled structures, local excessive deformation or springback is prone to occur, resulting in large roundness error and poor batch consistency after rounding.

[0004] To solve the above problems, it is urgent to design a rounding device that is adapted to the characteristics of thin-walled conduits, has controllable precision, and good consistency. Utility Model Content

[0005] The purpose of this invention is to overcome the shortcomings of the prior art and provide a device for rounding variable-diameter annular rings. This invention is particularly applicable to the rounding process of annular, small-diameter, thin-walled welded conduits, but is not limited thereto.

[0006] To achieve the above objectives, the present invention adopts the following technical solution: A device for making a variable diameter ring round includes a conical expansion core (1), on the outer side of the conical expansion core (1) from top to bottom, a compression nut (6), a pressure block assembly and a segmented conical block assembly are sequentially sleeved, and the compression nut (6) is threadedly connected to the conical expansion core (1). The cone-shaped expansion core (1) has a cone structure in the middle and several protrusions on its outer side; The segmented cone block assembly is composed of several equally divided segmented cone blocks (2). Each segmented cone block (2) is pressed against the cone of the cone expansion core (1) by a first compression spring (8) and a second compression spring (9). Each segmented cone block (2) has multiple sets of external shaping rings for multiple forming on its outer side and an internal groove matching the protrusion on its inner side. The upper end of each segmented cone block (2) has a U-shaped opening for limiting its circumferential and radial positions. The pressure block assembly comprises a pad (3), a support plate (4) connected by connecting screws (10) and a plurality of spacers (5), and each of the spacers (5) is sandwiched between the pad (3) and the support plate (4); The protrusion on the outer side of the cone expansion core (1) fits into the inner groove on the inner side of the segmented cone block (2) to limit the lower position of the segmented cone block (2); the U-shaped opening at the upper end of the segmented cone block (2) fits into the outer wall of the spacer (5) to limit its circumferential position at the upper end of the segmented cone block (2); the cone expansion core (1) has an annular step surface in the middle, and when the lower bottom surface of the support plate (4) abuts against the step surface, it limits the lower limit position of the segmented cone block (2).

[0007] As a preferred embodiment, the first compression spring (8) and the second compression spring (9) are configured as annular structures with different annular diameters.

[0008] As a preferred embodiment, a thrust spring (11) is provided between the conical expansion core (1) and the support plate (4).

[0009] As a preferred embodiment, the number of the protrusions is the same as the number of the segmented cone blocks (2) and the spacers (5).

[0010] As a preferred embodiment, a push rod (7) is fixedly connected to the outside of the compression nut (6).

[0011] As a preferred embodiment, the top of the conical expansion core (1) is threaded with a lifting ring (12).

[0012] This utility model has the following advantages: 1. High positioning accuracy: The positioning point 1 formed by the cooperation between the protrusion on the cone expansion core (1) and the groove at the lower end of the segmented cone block (2), and the positioning point 2 formed by the cooperation between the U-shaped opening at the upper end of the segmented cone block (2) and the spacer (5), and the contact between the bottom surface of the support plate (4) and the annular step surface in the middle of the cone expansion core (1), can realize the dual-point positioning of the upper and lower ends of the segmented cone block (2), improve the assembly consistency of the segmented cone block (2) and the coaxiality of the multiple sets of outer correction rings, thereby improving the roundness consistency of the guide tube after the rounding.

[0013] II. Stable forming: The outer diameter can be adjusted by axial movement of the segmented cone blocks. The workpiece to be formed is placed on the outer forming rings of different diameters and finally formed after multiple forming. The welding stress of the conduit can be effectively released in the pre-forming stage to avoid subsequent deformation and ensure the forming effect.

[0014] III. Convenient operation and simple structure: Mechanized diameter expansion is achieved by rotating the push rod. The combination of spring elastic clamping and threaded transmission ensures smooth movement of the segmented cone blocks without jamming and accurate adjustment. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the overall structure of a circular device for a variable-diameter ring.

[0016] Figure 2 yes Figure 1 A magnified view of a portion of point A in the middle.

[0017] Figure 3 This is a schematic diagram of a conical expansion core structure for a variable diameter circular ring (a is a cross-sectional view of the conical expansion core; b is a bottom view of the conical expansion core (direction D)).

[0018] Figure 4 This is a schematic diagram of the structure of a variable diameter circular ring, specifically a segmented cone block and its components (c is a cross-sectional view of the segmented cone block assembly; d is a top view of the segmented cone block assembly; e is a front view of the segmented cone block; f is a top view of the segmented cone block).

[0019] Figure 5 This is a schematic diagram of the positioning point 1 of a circular device for a variable diameter ring.

[0020] Figure 6 This is a schematic diagram of the positioning point 2 of a circular device for a variable diameter ring.

[0021] Figure 7 This is a schematic diagram of the calibration process of a circular device for a variable-diameter ring.

[0022] In the diagram: 1-conical expansion core; 2-segmented conical block; 3-pad; 4-support plate; 5-spacer; 6-compression nut; 7-push rod; 8-first compression spring; 9-second compression spring; 10-connecting screw; 11-thrust spring; 12-lifting ring. Detailed Implementation

[0023] The present invention will now be described in detail with reference to the accompanying drawings.

[0024] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present utility model and are not intended to limit the present utility model.

[0025] Example 1: like Figures 1-7 As shown, a device for forming a variable diameter ring includes a conical expansion core (1), a compression nut (6), a pressure block assembly, a segmented conical block assembly, a first compression spring (8), a second compression spring (9), a thrust spring (11), a push rod (7), and a lifting ring (12). The structure, connection relationship, and assembly process of each component are as follows: Conical expansion core (1): serves as the reference support component of the device; the top is provided with an internal threaded hole (for connecting the lifting ring 12), the upper outer side is machined with an external thread (for engaging with the compression nut 6), the middle part is a conical structure (providing expansion guidance for the segmented cone block 2), the outer side of the cone is uniformly provided with several protrusions along the circumference (the number is the same as that of the segmented cone block 2), the lower part is a square structure (for easy clamping and fixing with a vise), and the bottom surface is provided with multiple threaded holes (which can be fixed to the work platform with screws); The segmented cone block assembly consists of N segmented cone blocks (2) with the same structure. Preferably, N=12. Each segmented cone block (2) is evenly distributed at a 30° interval around the cone expansion core (1). The inner side of each segmented cone block (2) is an inclined surface that matches the cone in the middle of the cone expansion core (1). The inclined surface has an internal groove that fits into the protrusion. Multiple sets of external shaping rings (determined according to the shaping amount, generally three sets are preferred) are machined along the axial direction on the outer side (each set of external shaping rings corresponds to one shaping). The upper end has a U-shaped opening that matches the spacer (5). The pressure block assembly consists of a pad (3), a support plate (4), and N spacers (5). The pad (3) and the support plate (4) are both fitted onto the threaded cylindrical section of the conical expansion core (1). The spacers (5) are cylindrical structures. The N spacers (5) are evenly distributed around the pad (3). They are connected to the pad (3) by N connecting screws (10) through the support plate (4) and the spacers (5) in sequence, forming a rigid whole. In the assembled state, the lower surface of the pad (3) abuts against the upper surface of all the segmented conical blocks (2), so that the compression nut (6) pushes the segmented conical blocks (2) downward through the pressure block assembly. Elastic and transmission components: The first compression spring (8) and the second compression spring (9) are annular cylindrical helical compression springs (the diameter of the first compression spring is slightly larger than that of the second compression spring, which is adapted to the outer diameter of the upper and lower ends of the segmented cone block assembly), used to elastically press the segmented cone block (2) against the cone expansion core (1). The thrust spring (11) is sleeved on the outside of the cone expansion core (1) for resetting the pressure block assembly; Push rod (7) is fixed to the outside of the compression nut (6) and is used to rotate the compression nut (6) with less effort. The lifting ring (12) is a standard lifting ring, which is threaded to the top of the cone expansion core (1) for easy handling of the device.

[0026] The process of completing a circle: Step 1, Fixing device If a vise is used for fixing, the square structure at the bottom of the cone expansion core (1) is inserted into the vise clamping mouth and clamped to ensure that the axis of the device is perpendicular to the working platform; if a platform is used for fixing, the device is fixed to the working platform by using the threaded hole on the bottom surface of the cone expansion core (1) and the screw. Step 2, Shaping The welded, elliptical, thin-walled conduit (with an inner diameter slightly smaller than the outer diameter of the selected external alignment ring) is fitted onto the outside of the external alignment ring, ensuring that the conduit axis coincides with the device axis. The operator holds the push rod (7) and rotates the compression nut (6). The compression nut (6) moves downward along the cone expansion core (1) axis, and through the spacer (5), it drives the segmented cone block (2) to move downward along the cone in the middle of the cone expansion core (1). The segmented cone block (2) is squeezed by the inclined surface of the cone and expands outward until the external alignment ring is in contact with the inner wall of the conduit. It is held for a period of time (to release the welding stress). At the same time, the thrust spring (11) is compressed under the push of the pressure block assembly. Then, the compression nut (6) is rotated in the opposite direction. The segmented cone block (2) is slightly contracted under the elastic force of the first compression spring (8) and the second compression spring (9), completing the first pre-alignment. The workpiece formed in the previous step is transferred to a larger alignment ring. The above operation is repeated until all pre-alignment and final alignment are completed. Step 3: Remove the workpiece Rotate the push rod (7) in the opposite direction, squeeze the nut (6) to move upward, and push the pressure block assembly to move upward. The split cone block (2) retracts to its initial state under the action of the first clamping spring (8) and the second clamping spring (9), and the tube after being rounded can be easily removed.

[0027] This invention is not limited to the specific embodiments described above. This invention extends to any new feature or combination disclosed in this specification, as well as any new method or process step or combination disclosed herein.

Claims

1. A device for completing the circle of a variable diameter ring, characterized in that: The conical expansion core (1) is provided with a compression nut (6), a pressure block assembly and a segmented conical block assembly on the outer side of the conical expansion core (1) from top to bottom, and the compression nut (6) is threadedly connected to the conical expansion core (1). The cone-shaped expansion core (1) has a cone structure in the middle and several protrusions on its outer side; The segmented cone block assembly is composed of several equally divided segmented cone blocks (2). Each segmented cone block (2) is pressed against the cone of the cone expansion core (1) by a first compression spring (8) and a second compression spring (9). Each segmented cone block (2) has multiple sets of external shaping rings for multiple forming on its outer side and an internal groove matching the protrusion on its inner side. The upper end of each segmented cone block (2) has a U-shaped opening for limiting its circumferential and radial positions. The pressure block assembly includes a pad (3), a support plate (4), and several spacers (5). The lower surface of the pad (3) abuts against the upper surface of the split cone block. All the spacers (5) are evenly sandwiched between the pad (3) and the support plate (4). The pad (3), the spacers (5), and the support plate (4) are fixedly connected as a whole by several connecting screws (10). The protrusion on the outer side of the cone expansion core (1) fits into the inner groove on the inner side of the segmented cone block (2) to limit the lower position of the segmented cone block (2); the U-shaped opening at the upper end of the segmented cone block (2) fits into the outer wall of the spacer (5) to limit its circumferential position at the upper end of the segmented cone block (2); the cone expansion core (1) has an annular step surface in the middle, and when the lower bottom surface of the support plate (4) abuts against the step surface, it limits the lower limit position of the segmented cone block (2).

2. The device for making a variable diameter ring round according to claim 1, characterized in that: Both the first compression spring (8) and the second compression spring (9) are configured as annular structures, and the annular diameter of the first compression spring (8) is different from that of the second compression spring (9); the first compression spring (8) is sleeved on the outer side of the upper end of the segmented cone block assembly, and the second compression spring (9) is sleeved on the outer side of the lower end of the segmented cone block assembly.

3. The device for making a variable diameter ring round according to claim 1, characterized in that: A thrust spring (11) is provided between the conical expansion core (1) and the support plate (4).

4. The device for making a variable diameter ring round according to claim 1, characterized in that: The number of the protrusions is the same as the number of the segmented cone blocks (2) and the spacers (5).

5. The device for making a variable diameter ring round according to claim 1, characterized in that: A push rod (7) is fixedly connected to the outside of the compression nut (6).

6. The device for making a variable diameter ring round according to claim 1, characterized in that: The top of the conical expansion core (1) is threaded with a lifting ring (12).

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