Spinning roller for rotary extrusion forming of reinforced cylinder shell and rotary extrusion forming device of reinforced cylinder shell

Abstract

The utility model provides a spinning roller for the spin-extrusion forming of stiffened cylindrical shell and a spin-extrusion forming device of stiffened cylindrical shell, the spinning roller for the spin-extrusion forming of stiffened cylindrical shell comprises a spinning roller body, the end part of the spinning roller body comprises a pre-forming bulge, a forming bulge and a closing bulge which are sequentially arranged along the axial direction and protrude out of the spinning roller body, the height of the pre-forming protrusions is smaller than that of the forming protrusions. According to the spinning roller for rotary extrusion forming of the reinforced barrel shell and the rotary extrusion forming device of the reinforced barrel shell, firstly, the barrel blank is axially stretched through the powerful forming section where the pre-forming protrusion is located, the gap between the barrel blank and a mold is reduced, then, material accumulation is formed through the groove section between the pre-forming protrusion and the forming protrusion, and therefore the forming efficiency is improved. According to the forming method, large radial force is formed, the forming protrusions are promoted to further extrude the barrel blank material in a rotating mode, then rib grooves are effectively filled, finally, the surface quality of a formed part is effectively improved through the closing-up protrusions, and a gap between the formed part and a mold is further improved.

Description

Technical Field

[0001] This utility model belongs to the field of metal plastic processing technology, specifically relating to a rotary wheel and a rotary extrusion device for reinforcing cylindrical shells. Background Technology

[0002] Stiffened cylindrical shells, as lightweight, high-strength, and high-rigidity thin-walled cylindrical structures, are widely used in important aerospace structures such as aircraft fuselages, flight modules, and launch vehicle bodies, playing a crucial role in withstanding axial pressure, bending moment, and internal pressure. Aluminum alloy cylindrical shells are generally manufactured using a spin extrusion molding process, while stiffened cylindrical shells require the blank to be fully filled into the mold ribs during the forming process. However, existing spin extrusion designs are generally directly designed as chamfered cylinders, focusing only on pushing the blank axially, with very limited effect on filling the ribs radially. This results in a low material filling rate, adversely affecting the appearance and quality of the blank, making it difficult to meet the quality standards required for aerospace applications. Utility Model Content

[0003] The purpose of this utility model is to overcome the shortcomings of the existing technology and provide a rotary extrusion forming device for reinforced cylindrical shells with high material filling rate, high dimensional accuracy and good appearance quality.

[0004] To achieve the above objectives, the technical solution of this utility model is implemented as follows:

[0005] Based on one aspect of this utility model, a rotary extrusion forming wheel for reinforced cylindrical shell is provided, including a rotary wheel body. The end of the rotary wheel body includes a pre-forming protrusion, a forming protrusion and a closing protrusion arranged sequentially along the axial direction and protruding from the rotary wheel body. The height of the pre-forming protrusion is less than the height of the forming protrusion.

[0006] In one embodiment, the height of the tapering protrusion is equal to the height of the forming protrusion.

[0007] In one embodiment, the height difference between the preformed protrusion and the formed protrusion is 1-4 mm.

[0008] In one embodiment, the preformed protrusion is arc-shaped, the angle formed by the tangent at the starting point of the arc of the preformed protrusion is set between 15° and 45°, the central angle of the preformed protrusion is between 60° and 70°, and the radius of the corresponding central angle is between 4 and 12 mm.

[0009] In one embodiment, the forming protrusion is arc-shaped, the angle formed by the tangent at the starting point of the arc of the forming protrusion is set between 25° and 55°, the central angle corresponding to the forming protrusion is between 50° and 70°, and the radius of the corresponding central angle is between 4 and 12 mm.

[0010] In one embodiment, the constriction protrusion is arc-shaped, the angle formed by the tangent at the starting point of the arc of the constriction protrusion is set between 15° and 45°, the central angle corresponding to the constriction protrusion is between 40° and 60°, and the radius of the corresponding central angle is between 4 and 12 mm.

[0011] In one embodiment, a transition groove is formed between the preformed protrusion and the formed protrusion. The transition groove includes a rear straight segment connected to the preformed protrusion. The inclination angle of the rear straight segment is set between 10° and 30°, and the horizontal length of the rear straight segment is between 5 and 20 mm.

[0012] In one embodiment, the horizontal distance between the most prominent part of the preformed protrusion and the most prominent part of the formed protrusion is greater than twice the horizontal length of the rear straight segment.

[0013] In one embodiment, the starting end of the spinning wheel body and the pre-formed protrusion are connected by an inclined sidewall with an inclination angle of 15-45°, and the pre-formed protrusion is provided protruding relative to the starting end of the spinning wheel body.

[0014] According to another aspect of the present invention, a spin forming apparatus for reinforced cylindrical shells is provided, comprising a spin wheel for spin forming of reinforced cylindrical shells as described in any of the preceding claims.

[0015] Compared with the prior art, the rotary wheel and rotary extrusion device for stiffened cylindrical shells of this utility model, in the forming process, firstly, the pre-forming protrusion of the rotary wheel strongly shapes the cylindrical blank. As the rotary wheel advances axially, the material gradually accumulates in front of the pre-forming protrusion, and resistance gradually forms in the axial direction. Therefore, some material is squeezed into the rib groove under the action of radial force. Then, with the height difference between the pre-forming protrusion and the forming protrusion, the material is further squeezed and continues to fill the rib groove under the push of radial force. As the rotary wheel advances axially, the material gradually accumulates in front of the forming protrusion, and the maximum resistance is formed under the action of the groove section between the pre-forming protrusion and the forming protrusion, so that the radial force reaches the maximum and the material is more easily squeezed into the rib groove. Finally, the surface quality of the formed cylindrical blank is controlled by the closing protrusion, which can obtain a stiffened cylindrical shell with higher material filling rate, higher dimensional accuracy and better appearance quality. Attached Figure Description

[0016] Figure 1This is a cross-sectional structural schematic diagram of an embodiment of a rotary extrusion forming wheel for reinforced cylindrical shells according to the present invention;

[0017] Figure 2 for Figure 1 A schematic diagram of the working surface of the rotating wheel is shown.

[0018] Figure 3 for Figure 1 The diagram shows the functional zones of the rotating wheel.

[0019] Figure 4 This is a cross-sectional structural schematic diagram of another embodiment of the rotary extrusion forming wheel for reinforced cylindrical shells according to this utility model.

[0020] Explanation of reference numerals in the attached drawings: 1 Pre-formed protrusion, 2 Formed protrusion, 3 Closing protrusion, 4 Transition groove, 41 Rear straight section, 43 Transition arc section, 5 Side wall. Detailed Implementation

[0021] This embodiment provides a rotary extrusion forming wheel for reinforced cylindrical shells. The working surface of the rotary wheel is a textured surface, such as... Figure 1 As shown, the device includes a spinning wheel body. The end of the spinning wheel body includes a pre-formed protrusion 1, a formed protrusion 2, and a tapering protrusion 3, which are arranged axially and protrude from the spinning wheel body. The height of the pre-formed protrusion 1 is less than the height of the formed protrusion 2. An inclined sidewall 5 is formed between the beginning of the spinning wheel body and the pre-formed protrusion 1.

[0022] In this embodiment, as Figure 2 As shown, the pre-forming protrusion 1, the forming protrusion 2, and the closing protrusion 3 sequentially form a first pre-forming wheel forming angle α1, a second forming wheel forming angle α2, and a third forming wheel forming angle α3 relative to the wheel body. The generatrices of the working surfaces of the pre-forming protrusion 1, the forming protrusion 2, and the closing protrusion 3 are all arc-shaped. The forming angle α1 of the first preforming wheel is set between 15° and 45°, the central angle corresponding to the arc-shaped preforming protrusion 1 is between 60° and 70°, and the radius of the corresponding central angle is set between 4 and 12 mm. The forming angle α1 of the first preforming wheel is the angle formed by the tangent of the arc starting point of the preforming protrusion 1. The forming angle α2 of the second forming wheel is set between 25° and 55°, the central angle corresponding to the arc-shaped forming protrusion 2 is between 50° and 70°, and the radius of the corresponding central angle is set between 4 and 12 mm. The forming angle α2 of the second forming wheel is the angle formed by the tangent of the arc starting point of the forming protrusion 2. The forming angle α3 of the third forming wheel is set between 15° and 45°, the central angle corresponding to the arc-shaped tapering protrusion 3 is between 50° and 70°, and the radius of the corresponding central angle is set between 4 and 12 mm. The forming angle α3 of the third forming wheel is the angle formed by the tangent of the arc starting point of the tapering protrusion 3.

[0023] In this embodiment, the height of the closing protrusion 3 is equal to the height of the forming protrusion 2. The height difference h between the pre-forming protrusion 1 and the forming protrusion 2 is 1-4 mm. A transition groove 4 is formed between the pre-forming protrusion 1 and the forming protrusion 2. Specifically, the transition groove 4 includes a rear straight section 41 and a transition arc section 43. The generatrix of the working surface of the rear straight section 41 is a straight line, and the generatrix of the working surface of the transition arc section 43 is an arc. The radial angle β formed by the rear straight section 41 is set between 10° and 30°, and the horizontal length of the rear straight section 41 is... l (i.e., the projected length on the central axis of the spinning wheel) is between 5-20mm. The horizontal distance between the most prominent point of the pre-formed protrusion 1 and the most prominent point of the formed protrusion 2 is greater than twice the horizontal length of the rear straight segment 41. l .

[0024] In this embodiment, there is an inclined sidewall 5 between the beginning of the spinning wheel body and the preformed protrusion 1. The inclination angle of the sidewall 5 is 15-45°. The preformed protrusion 1 is protruding relative to the beginning of the spinning wheel body, that is, the beginning of the spinning wheel body is farther from the surface of the stiffened cylindrical shell than the preformed protrusion 1. The generatrix of the working surface of the sidewall 5 is a straight line, which coincides with the tangent of the arc starting point of the preformed protrusion 1.

[0025] In this embodiment, as Figure 3 As shown, the process can be functionally divided into a powerful forming section I, a blocking section II, a forming extrusion section III, and a forming smoothing section IV. During the forming process, firstly, the powerful forming section I of the rotating wheel forcefully forms the cylindrical blank. As the rotating wheel advances axially, the material gradually accumulates in front of the powerful forming section I, creating resistance in the axial direction. Therefore, some material is squeezed into the rib grooves under the action of radial force, but the radial force is relatively small at this point. Secondly, with a height difference between the pre-forming protrusion 1 and the forming protrusion 2, the material is further affected by the forming extrusion section III, continuing to fill the rib grooves under the push of radial force. As the rotating wheel advances axially, the material gradually accumulates in front of the forming extrusion section III. Due to the presence of the blocking section II, maximum resistance is formed, the radial force reaches its maximum, and the material is more easily squeezed into the rib grooves. Finally, in the forming smoothing section IV, the surface quality of the formed cylindrical blank is controlled to reduce dimensional accuracy errors.

[0026] In this embodiment, the radial angle β formed by the rear straight segment 41 of the transition groove 4 and the horizontal length of the rear straight segment 41 are... lThe height difference h between preformed protrusion 1, forming protrusion 2, and closing protrusion 3 is a crucial parameter, as all three directly influence the material buildup in front of forming protrusion 2 during the forming process. A suitable height difference h between preformed protrusion 1, forming protrusion 2, and closing protrusion 3 ensures sufficient material buildup at the front end of the forming extrusion section III, increasing radial force and facilitating groove filling. Simultaneously, ensuring the height difference h remains within a suitable range avoids negative impacts on equipment and processes due to excessive buildup. For example, excessive material buildup hinders the axial advancement of the rotating roller, and a larger height difference significantly increases the amount of material formed by forming protrusion 2, negatively affecting forming stability. Therefore, the height difference h is set between 1-4 mm.

[0027] like Figure 2 As shown, the radial angle β formed by the rear straight segment 41 of the transition groove 4 and the horizontal length of the rear straight segment 41 are... l The area of ​​the accumulation region in the blocking section II is jointly constructed. A larger area is more conducive to increasing the radial force filling the rib groove, but excessive accumulation will hinder the axial advancement of the wheel. Therefore, the radial action angle β formed by the rear straight section 41 is set between 10° and 30°, and the horizontal length is... l Set between 5-20mm.

[0028] The rotary wheel in this embodiment is used for spin extrusion forming of reinforced cylindrical shells with reinforcing ribs on the outer wall, such as... Figure 4 The rotary wheel shown can be used for spin extrusion forming of reinforced cylindrical shells with reinforcing ribs on the inner wall.

[0029] This utility model also provides a spin forming device for reinforced cylindrical shells, including the spin forming wheel for reinforced cylindrical shells as described above.

[0030] The present invention discloses a rotary wheel and a rotary extrusion device for reinforcing cylindrical shells. First, the cylindrical blank is axially stretched through the strong forming section where the pre-forming protrusion is located, which helps to reduce the gap between the cylindrical blank and the mold. Then, material accumulation is formed through the blocking section where the transition groove is located, generating a large radial force, which prompts the forming protrusion to further spin extrude the cylindrical blank material and effectively fill the rib groove. Finally, the surface quality of the formed part is effectively improved through the closing protrusion, and the gap between the formed part and the mold is further improved.

[0031] Those skilled in the art should understand that the discussion of any of the above embodiments is merely exemplary and is not intended to imply that the scope of protection of this application is limited to these examples; within the framework of this application, the technical features of the above embodiments or different embodiments can also be combined, the steps can be implemented in any order, and there are many other variations of different aspects of one or more embodiments of this application as described above, which are not provided in detail for the sake of brevity.

[0032] One or more embodiments in this application are intended to cover all such substitutions, modifications, and variations that fall within the broad scope of this application. Therefore, any omissions, modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of one or more embodiments in this application should be included within the protection scope of this application.

Claims

1. A rotary extrusion forming wheel for reinforced cylindrical shells, characterized in that, The device includes a spinning wheel body, the end of which includes a pre-formed protrusion (1), a formed protrusion (2) and a closing protrusion (3) arranged sequentially along the axial direction and protruding from the spinning wheel body. The height of the pre-formed protrusion (1) is less than the height of the formed protrusion (2).

2. The rotary extrusion forming wheel for reinforced cylindrical shells as described in claim 1, characterized in that, The height of the closing protrusion (3) is equal to the height of the forming protrusion (2).

3. The rotary extrusion forming wheel for reinforced cylindrical shells as described in claim 1, characterized in that, The height difference between the preformed protrusion (1) and the formed protrusion (2) is 1-4 mm.

4. The rotary extrusion forming wheel for reinforced cylindrical shells as described in claim 1, characterized in that, The preformed protrusion (1) is arc-shaped. The angle formed by the tangent of the arc starting point of the preformed protrusion (1) is set between 15° and 45°. The central angle of the preformed protrusion (1) is between 60° and 70°, and the radius of the corresponding central angle is between 4 and 12 mm.

5. The rotary extrusion forming wheel for reinforced cylindrical shells as described in claim 1, characterized in that, The forming protrusion (2) is arc-shaped, and the angle formed by the tangent of the starting point of the arc of the forming protrusion (2) is set between 25° and 55°. The central angle of the forming protrusion (2) is between 50° and 70°, and the radius of the corresponding central angle is between 4 and 12 mm.

6. The rotary extrusion forming wheel for reinforced cylindrical shells as described in claim 1, characterized in that, The constriction protrusion (3) is arc-shaped, and the angle formed by the tangent of the arc starting point of the constriction protrusion (3) is set between 15° and 45°, and the radius of the central angle corresponding to the constriction protrusion (3) is between 4 and 12 mm.

7. The rotary extrusion forming wheel for reinforced cylindrical shells as described in any one of claims 1-6, characterized in that, A transition groove (4) is formed between the preformed protrusion (1) and the formed protrusion (2). The transition groove (4) includes a rear straight section (41) connected to the preformed protrusion (1). The inclination angle of the rear straight section (41) is set between 10° and 30°, and the horizontal length of the rear straight section (41) is between 5 and 20 mm.

8. The rotary extrusion forming wheel for reinforced cylindrical shells as described in claim 7, characterized in that, The horizontal distance between the most prominent part of the preformed protrusion (1) and the most prominent part of the formed protrusion (2) is greater than twice the horizontal length of the rear straight segment (41).

9. The rotary extrusion forming wheel for reinforced cylindrical shells as described in any one of claims 1-6, characterized in that, The beginning of the swivel body and the preformed protrusion (1) are connected by an inclined sidewall (5), the inclination angle of the sidewall (5) is 15-45°, and the preformed protrusion (1) is protruding relative to the beginning of the swivel body.

10. A spin extrusion forming apparatus for reinforced cylindrical shells, characterized in that, Includes the rotary extrusion roller for reinforcing cylindrical shells as described in any one of claims 1-9.

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