Internally supported variable diameter conformal mandrel for aerospace tube forming equipment

Abstract

The present invention discloses an internal support variable diameter conformal mandrel for aerospace catheter forming equipment, comprising a first mounting seat, a second mounting seat and a plurality of arc-shaped conformal plates, the second mounting seat can move along the axial direction of a driving shaft, the first mounting seat is axially fixed to the driving shaft, the conformal plate is arranged around the first mounting seat and the second mounting seat, and also comprises a first connecting rod, a second connecting rod, a third connecting rod and a fourth connecting rod, one end of the first connecting rod is hinged to the first mounting seat, the other end of the first connecting rod is slidably connected to the conformal plate, the second connecting rod is cross-arranged and hinged with the first connecting rod, one end of the second connecting rod is hinged to one end of the third connecting rod, the other end of the second connecting rod is hinged to the fourth connecting rod, the other end of the third connecting rod is hinged to the second mounting seat, and the other end of the fourth connecting rod is hinged to the conformal plate. In this way, the end of the thin-walled catheter can be effectively supported and fixed without causing damage to the catheter, and the control is more precise.

Description

Technical Field

[0001] The invention relates to the field of aerospace, and in particular to an inner-supported variable-diameter shape-keeping mandrel used in aerospace catheter forming equipment. Background Art

[0002] In order to meet the lightweight design requirements, thin-walled tubes are widely used in aerospace applications. Thin-walled tubes need to be reliably clamped during processing to have the strength and rigidity required for processing.

[0003] The patent document with publication number CN214562925U discloses a pipe orifice shaping device for an ultra-large diameter PE pipe, comprising: a flange sleeve, a support assembly for supporting a shaping PE pipe body, and an adjusting assembly for adjusting the supporting size of the supporting assembly, wherein the adjusting assembly is movably sleeved on the flange sleeve, the flange sleeve is arranged transversely, the flange sleeve comprises a flange head and a barrel, the flange head is fixedly arranged at one end of the barrel, the supporting assembly comprises a first connecting rod and a second connecting rod, one end of the first connecting rod is hinged to the flange head, the other end of the first connecting rod is hinged to the flange head, and the other end of the first connecting rod is hinged to the flange head. One end is close to the inner wall of the PE pipe body, one end of the second connecting rod is hinged to the adjusting assembly, the other end of the second connecting rod is close to the inner wall of the PE pipe body, the first connecting rod and the second connecting rod are staggered, the first connecting rod and the second connecting rod are hinged at the staggered point, the adjusting assembly includes a propulsion sleeve and a sliding ring, when the flange head is located at the right end of the barrel, the propulsion sleeve is movably mounted on the barrel from the left end of the barrel, the sliding ring is set on the right end of the propulsion sleeve, and one end of the second connecting rod is hinged to the sliding ring.

[0004] The tube parts used in aerospace have the characteristics of thin tube walls and easy deformation. The device in the prior art directly pushes the inner wall of the tube through one end of the first connecting rod and one end of the second connecting rod, so that the device in the prior art supports the inner wall of the catheter at a single point. The support area is small, and the structural force at the end of the catheter is uneven, so the tube cannot be fixed. In the subsequent forming process, the tube may rotate or even deform and pierce the tube wall. This places extremely high requirements on the control of the device in the prior art, and greatly increases the difficulty of controlling the thin-walled catheter during the forming process. Summary of the invention

[0005] In order to solve the problem in the prior art of how to fix a thin-walled catheter from the inside without damaging the thin-walled guide rail, the purpose of the present invention is to provide an internally supported variable-diameter conformal mandrel for aerospace catheter forming equipment, which can effectively support and fix the end of the thin-walled catheter without causing damage to the catheter and provides more precise control.

[0006] In order to achieve the above-mentioned objectives, the present invention adopts the following technical solutions: an internally supported variable diameter conformal mandrel for aerospace catheter forming equipment, comprising a first mounting seat, a second mounting seat, a plurality of variable diameter assemblies and a plurality of conformal plates for supporting the inner wall of the catheter, the conformal plate is arc-shaped, the second mounting seat can move along the axial direction of the drive shaft, the first mounting seat is axially fixed to the drive shaft, the conformal plate is arranged around the first mounting seat and the second mounting seat, the conformal plate is connected to the first mounting seat and the second mounting seat through a variable diameter mechanism, the variable diameter mechanism comprises a first connecting rod, a second connecting rod, a third connecting rod and a fourth connecting rod, one end of the first connecting rod is hinged to the first mounting seat, the other end of the first connecting rod is slidably connected to the conformal plate, the second connecting rod is cross-arranged and hinged with the first connecting rod, one end of the second connecting rod is hinged to one end of the third connecting rod, the other end of the second connecting rod is hinged to the fourth connecting rod, the other end of the third connecting rod is hinged to the second mounting seat, and the other end of the fourth connecting rod is hinged to the conformal plate.

[0007] Preferably, the length of the second connecting rod, the length of the third connecting rod and the length of the fourth connecting rod decrease in sequence.

[0008] Preferably, the distance between the hinge points at both ends of the first link is greater than the sum of the distance between the hinge points at both ends of the second link, the distance between the hinge points at both ends of the third link, and the distance between the hinge points at both ends of the fourth link.

[0009] Preferably, it also includes a first connecting seat and a second connecting seat, the first connecting seat and the second connecting seat are fixedly connected to the conformal plate, the other end of the third connecting rod is hinged to the first connecting seat, and the other end of the fourth connecting rod is slidably connected to the second connecting seat.

[0010] Preferably, a plurality of legs for connecting to the reducer assembly are protruded from the first mounting seat and the second mounting seat, and the plurality of legs correspond one-to-one to the plurality of conformal plates.

[0011] Preferably, any of the conformal plates is connected to the first mounting seat and the second mounting seat via two sets of reducing components.

[0012] Preferably, it further comprises a servo motor for driving the second mounting seat to move along the driving shaft, and the second mounting seat is located between the servo motor and the first mounting seat.

[0013] Preferably, the servo motor drives the second mounting seat to move along the driving shaft through a reducer.

[0014] Preferably, the second mounting seat is threadedly connected to the drive shaft, and the first mounting seat is rotationally connected to the drive shaft.

[0015] The beneficial effects of the technical solution of the present invention are as follows: the conformal mandrel is enabled to support the catheter from the inside of the catheter, and can be used for processes such as rounding, expanding, and fixing the catheter end; the maximum adjustment distance of the conformal mandrel is not determined by the moving distance of the second mounting seat, but is determined by the second connecting rod, the third connecting rod, and the fourth connecting rod, thereby avoiding collision between the first mounting seat and the second mounting seat, improving the safety of the conformal mandrel, and in this way the conformal mandrel can be deployed more slowly, and the positioning accuracy of the conformal core can be more accurately controlled; the conformal mandrel uses an arc-shaped sheet-like conformal plate to support the inner wall of the catheter, rather than point support, which can better protect the catheter, make the inner diameter of the catheter more uniform, and can eliminate the impact of the inner diameter support on the part of the catheter during the catheter forming process, thereby improving the yield rate of the catheter. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 The structure of the inner support variable diameter shape-keeping mandrel in the present invention is schematically shown. Figure 1 ;

[0017] Figure 2 The structure of the inner support variable diameter shape-keeping mandrel in the present invention is schematically shown. Figure 2 .

[0018] Figure numerals: 1. servo motor; 2. reduction gearbox; 3. drive shaft; 4. first mounting seat; 5. second mounting seat; 6. conformal plate; 7. first connecting rod; 8. second connecting rod; 9. third connecting rod; 10. fourth connecting rod; 11. first connecting seat; 12. second connecting seat; 13. sliding hole; 14. first support leg; 15. second support leg. DETAILED DESCRIPTION

[0019] Embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present invention, and should not be construed as limiting the present invention.

[0020] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "clockwise", "counterclockwise" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0021] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, unless otherwise specified, "plurality" means two or more, unless otherwise clearly specified.

[0022] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0023] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0024] Example 1

[0025] An internal support variable diameter conformal mandrel for aerospace tube forming equipment, such as Figure 1 and Figure 2As shown, it includes a first mounting seat 4, a second mounting seat 5, a driving shaft 3, a plurality of reducing assemblies and a plurality of conformal plates 6 for supporting the inner wall of the catheter, the first mounting seat 4 and the second mounting seat 5 are both sleeved on the driving shaft 3, the second mounting seat 5 can move along the axial direction of the driving shaft 3, the first mounting seat 4 is axially fixed to the driving shaft 3, the conformal plate 6 is arranged around the first mounting seat 4 and the second mounting seat 5, the conformal plate 6 is connected to the first mounting seat 4 and the second mounting seat 5 through a reducing mechanism, the reducing mechanism includes a first connecting rod 7, a second connecting rod 8, a third connecting rod 9 and a fourth connecting rod 10, one end of the first connecting rod 7 is hinged to the first mounting seat 4, the other end of the first connecting rod 7 is slidably connected to the conformal plate 6, the second connecting rod 8 is cross-arranged and hinged with the first connecting rod 7, one end of the second connecting rod 8 is hinged to one end of the third connecting rod 9, the other end of the second connecting rod 8 is hinged to the fourth connecting rod 10, the other end of the third connecting rod 9 is hinged to the second mounting seat 5, and the other end of the fourth connecting rod 10 is hinged to the conformal plate 6.

[0026] Such an arrangement enables the conformal mandrel to support the catheter from the inside of the catheter, and can be used for processes such as rounding, expanding, and fixing the catheter end; the maximum adjustment distance of the conformal mandrel is not determined by the moving distance of the second mounting seat, but is determined by the second connecting rod, the third connecting rod, and the fourth connecting rod, thereby avoiding collision between the first mounting seat and the second mounting seat, improving the safety of the conformal mandrel, and without changing the length of the first connecting rod, the adjustment range of the conformal mandrel can be changed by changing the length of the remaining connecting rods, making the conformal mandrel more flexible; the conformal mandrel uses a sheet-like conformal plate to support the inner wall of the catheter, which can better protect the catheter, make the inner diameter of the catheter more uniform, and can reduce the impact of the part of the catheter that has been supported on the inner diameter during the catheter forming process, thereby improving the yield rate of the catheter.

[0027] In this embodiment, the conformal plate 6 is an arc-shaped plate. When the conformal mandrel is in a contracted state, a plurality of conformal plates can enclose a hollow cylindrical shape; when the conformal mandrel is expanded outward, the outer diameter of the conformal mandrel reaches a minimum, and when the second mounting seat 5 moves axially along the driving shaft 3, the second mounting seat 5 pushes the third connecting rod 9, the third connecting rod 9 pushes the second connecting rod 8, the second connecting rod 8 rotates around the hinge point between it and the first connecting rod 7, the second connecting rod 8 pushes the first connecting rod 7 to rotate around the hinge point between the first connecting rod 7 and the first mounting seat 4, the first connecting rod 7 slides along the conformal plate, and the second connecting rod 8 pushes the conformal plate 6 outward through the fourth connecting rod 10. Such a configuration can increase the contact surface between the conformal mandrel and the inner wall of the catheter, and better support the catheter.

[0028] In this embodiment, a plurality of legs are protruded from both the first mounting seat 4 and the second mounting seat 5. The leg on the first mounting seat 4 is the first leg 14, and the leg on the second mounting seat 5 is the second leg 15. The plurality of first legs 14 and the plurality of second legs 15 correspond to the plurality of conformal plates 6 one by one. The conformal plates 6 are fixedly mounted with the first connecting seat 11 and the second connecting seat 12. One end of the first connecting rod 7 is hinged to the first leg 14, and the other end of the first connecting rod 7 is slidably connected to the second connecting seat 12. One end of the third connecting rod 9 is hinged to the second leg 15, and one end of the fourth connecting rod 10 is hinged to the first connecting seat 11. Such an arrangement makes the installation of the reducer assembly more convenient.

[0029] In this embodiment, each conformal plate 6 is connected to the first mounting seat 4 and the second mounting seat 5 through two reducer assemblies. Such a setting can increase the stability of the conformal plate support. Specifically, in the two reducer assemblies connected to the same conformal plate 6, the first connecting rods 7 of the two reducer assemblies are located on both sides of a first support leg 14, the first connecting rods 7 of the two reducer assemblies are located on both sides of a second connecting seat 12, the third connecting rods 9 of the two reducer assemblies are located on both sides of a second support leg 15, and the fourth connecting rods 10 of the two reducer assemblies are located on both sides of a first mounting seat 4. The first connecting rods 7 of the two reducer assemblies are hinged to the first support leg 14 of the first mounting seat through a hinge shaft, the third connecting rods 7 of the two reducer assemblies are hinged to the second support leg 15 of the second mounting seat 5 through a hinge shaft, and the fourth connecting rods 10 of the two reducer assemblies are hinged to the first connecting seat 11 through a hinge shaft. Such a setting facilitates the installation of the same reducer assembly and improves the stability of the conformal plate activity. Furthermore, a sliding hole 13 is formed on the second connecting seat 12, a roller is arranged in the sliding hole 13, and the first connecting rods 7 of the two diameter-changing components are located on both sides of the roller. The first connecting rods 7 of the two diameter-changing components are connected through an axis penetrating the roller.

[0030] In this embodiment, the conformal mandrel also includes a servo motor 1 for driving 5 to move. In this way, the movement rate and distance of the second mounting seat 5 can be controlled by accurately controlling the movement of the servo motor 1. Furthermore, the drive shaft 3 is a screw, the drive shaft 3 is connected to the output end of the reduction box 2, the input end of the reduction box 2 is connected to the servo motor 1, and the second mounting seat 5 is located between the first mounting seat 4 and the reduction box 2, the first mounting seat 4 is rotatably connected to the drive shaft 3, and the second mounting seat 5 is threadedly connected to the drive shaft 3. With such a configuration, the structure in which the servo motor cooperates with the reduction box to drive the second mounting seat to move on the drive rod can finely control the degree of expansion of the conformal mandrel and meet the requirements of the guide rail accuracy to the greatest extent.

[0031] In this embodiment, the length of the second connecting rod 7, the length of the third connecting rod 8 and the length of the fourth connecting rod 9 are reduced in sequence. With such a configuration, after the second mounting seat 5 moves, a lever structure can be formed at the second connecting rod 8 and the first connecting rod 7, and since the length of the third connecting rod is greater than that of the fourth connecting rod, the swing angle of the fourth connecting rod is greater than the swing hinge of the third connecting rod, so that the conformal mandrel can be quickly unfolded from the contracted state, and since the length of the fourth connecting rod is the shortest and is connected to the conformal plate, after the fourth connecting rod is perpendicular to the conformal plate, if the second mounting seat continues to approach the first mounting seat, the outward movement speed of the conformal plate will slow down, and this process will continue until the third connecting rod is perpendicular to the conformal plate, so that the unfolding of the conformal mandrel can be better controlled, and after the third connecting rod is perpendicular to the conformal plate, if the second mounting seat continues to move, the variable diameter mandrel moves with a tendency to return to the contracted state, thereby better protecting the variable diameter mandrel itself.

[0032] In this embodiment, the distance between the hinge points at both ends of the first connecting rod 7 is greater than the sum of the distance between the hinge points at both ends of the second connecting rod 8, the distance between the hinge points at both ends of the third connecting rod 8, and the distance between the hinge points at both ends of the fourth connecting rod 9. In this way, the first connecting rod can always maintain an inclined state, so that the conformal mandrel maintains a tendency to expand outward.

[0033] A method for using the structure of the above-mentioned internally supported variable-diameter conformal mandrel for aerospace catheter forming equipment is provided; first, the servo motor 1 drives the reducer 2 to drive the drive shaft 3 to rotate, and the drive shaft 3 rotates to drive the variable-diameter assembly to expand so that multiple conformal plates move outward at the same time. When the outer diameter of the moving conformal plate is slightly smaller than the inner diameter of the catheter, the multiple conformal plates are inserted into the catheter; then the servo motor continues to drive the reducer to drive the drive shaft to rotate, and finally the inner wall of the catheter is pressed against the conformal surface by the multiple conformal plates.

[0034] In other embodiments, different from the present embodiment, the first mounting seat 4 is threadedly connected to the driving shaft 3, a sleeve is hollowly sleeved on the driving shaft 3, the sleeve is fixedly connected to the housing of the reduction gearbox 2, and the second mounting seat 5 is fixed on the sleeve; thus, the power for driving the conformal mandrel to expand outward comes from the axial movement of the first mounting seat along the driving shaft.

[0035] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.

[0036] Although the embodiments of the present invention have been shown and described above, it is to be understood that the above embodiments are exemplary and are not to be construed as limitations on the present invention. A person skilled in the art may change, modify, replace and modify the above embodiments within the scope of the present invention without departing from the principles and intent of the present invention.

Claims

1. An internal support variable diameter conformal mandrel for aerospace catheter forming equipment, Features: The invention comprises a first mounting seat (4), a second mounting seat (5), a plurality of diameter-changing assemblies and a plurality of conformal plates (6) for supporting the inner wall of a catheter, wherein the conformal plates are arc-shaped, the second mounting seat (5) is capable of moving along the axial direction of a drive shaft (3), the first mounting seat (4) is axially fixed to the drive shaft (3), the conformal plates (6) are arranged around the first mounting seat (4) and the second mounting seat (5), and the conformal plates (6) are connected to the first mounting seat (4) and the second mounting seat (5) via a diameter-changing mechanism, wherein the diameter-changing mechanism comprises a first connecting rod (7), a second connecting rod (8), a first connecting rod (9), a second connecting rod (10), a first connecting rod (11), a second connecting rod (12), a first connecting rod (13), a second connecting rod (14), a first connecting rod (15), a second connecting rod (16), a first connecting rod (17), a second connecting rod (18), a first connecting rod (19), a second connecting rod (20), a first connecting rod (21), a second connecting rod (22), a first connecting rod (23), a second connecting rod (24), a first connecting rod (25), a second connecting rod (26), a first connecting rod (27), a second connecting rod (28), a first connecting rod (29), a first connecting rod (3), a second connecting rod (3), a first connecting rod (4), a second connecting rod (5), a first connecting rod (5 Three connecting rods (9) and a fourth connecting rod (10), one end of the first connecting rod (7) is hinged to the first mounting seat (4), the other end of the first connecting rod (7) is slidably connected to the conformal plate (6), the second connecting rod (8) is cross-arranged with the first connecting rod (7) and hinged, one end of the second connecting rod (8) is hinged to one end of the third connecting rod (9), the other end of the second connecting rod (8) is hinged to the fourth connecting rod (10), the other end of the third connecting rod (9) is hinged to the second mounting seat (5), and the other end of the fourth connecting rod (10) is hinged to the conformal plate (6); The length of the second connecting rod (8), the length of the third connecting rod (9) and the length of the fourth connecting rod (10) decrease in sequence; The distance between the hinge points at both ends of the first connecting rod (7) is greater than the sum of the distance between the hinge points at both ends of the second connecting rod (8), the distance between the hinge points at both ends of the third connecting rod (9), and the distance between the hinge points at both ends of the fourth connecting rod (10).

2. The inner support variable diameter conformal mandrel for aerospace duct forming equipment according to claim 1, Features: It also includes a first connecting seat (11) and a second connecting seat (12), the first connecting seat (11) and the second connecting seat (12) are both fixedly connected to the conformal plate (6), the other end of the third connecting rod (9) is hinged to the first connecting seat (11), and the other end of the fourth connecting rod (10) is slidably connected to the second connecting seat (12).

3. The inner support variable diameter conformal mandrel for aerospace duct forming equipment according to claim 1, Features: The first mounting seat (4) and the second mounting seat (5) both have a plurality of protruding legs for connecting to the diameter-changing assembly, and the plurality of legs correspond one to one to the plurality of conformal plates (6).

4. The inner support variable diameter conformal mandrel for aerospace duct forming equipment according to claim 1, Features: The conformal plates (6) are connected to the first mounting seat (4) and the second mounting seat (5) via two sets of diameter-changing components.

5. The inner support variable diameter conformal mandrel for aerospace duct forming equipment according to claim 1, Features: It also includes a servo motor (1) for driving the second mounting seat (5) to move along the drive shaft (3), wherein the second mounting seat (5) is located between the servo motor (1) and the first mounting seat (4).

6. The inner support variable diameter conformal mandrel for aerospace duct forming equipment according to claim 5, Features: The servo motor (1) drives the second mounting seat (5) to move along the driving shaft (3) via a reducer.

7. The inner support variable diameter conformal mandrel for aerospace duct forming equipment according to claim 1, Features: The second mounting seat (5) is threadedly connected to the drive shaft (3), and the first mounting seat (4) is rotationally connected to the drive shaft (3).

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