Device for clamping and fixing of multilayer thin-walled semi-closed riveted parts and method of processing

Abstract

The application relates to the technical field of aero-engines, and particularly discloses a device for clamping and fixing a multilayer thin-wall semi-enclosed riveting piece and a processing method, which comprises a base, a supporting piece installed on the base and used for supporting a small end of the multilayer thin-wall semi-enclosed riveting piece, a positioning pressing plate located above the base and used for pressing and limiting a large end of the multilayer thin-wall semi-enclosed riveting piece, and a support installed on the base and used for installing the positioning pressing plate; the positioning pressing plate, the supporting piece and the base are coaxially arranged.

Description

Technical Field

[0001] This invention relates to the field of aero-engine technology, and more specifically, to a device and processing method for clamping and fixing multi-layer thin-walled semi-enclosed riveted parts. Background Technology

[0002] Multi-layer thin-walled semi-enclosed riveted parts are components of the fan assembly in engines. Their structure consists of multiple layers of thin-walled aluminum alloy material and annular mounting edges connected by riveting. The overall shape resembles a basin-like semi-circular structure. Two mounting seats are located on the end face of the mounting edge, each with a pin hole. Assembly requirements are met when the pin holes, the outer circle of the mounting edge, and the bottom center hole are concentric. However, when using existing technology for processing, the multi-layered structure of the multi-layer thin-walled semi-enclosed riveted parts is prone to deformation after riveting, causing deviations between the pin holes, the outer circle of the mounting edge, and the bottom center hole, thus failing to meet assembly requirements. Meanwhile, due to the poor overall rigidity of multi-layer thin-walled semi-enclosed riveted parts, the existing equipment cannot guarantee the constraint and positioning during processing, which makes the processed products unable to meet the usage requirements. When installing the single piece, the bosses on the outer and inner circles are pre-processed to the dimensions required by the drawing. This processing method makes it difficult to guarantee the positional accuracy of the bosses on the inner circle, which poses a risk to the assembly. Summary of the Invention

[0003] The technical problem to be solved by the present invention is to provide a device and processing method for clamping and fixing multi-layer thin-walled semi-enclosed riveted parts, which can effectively realize the clamping and fixing of multi-layer thin-walled semi-enclosed riveted parts, facilitate the subsequent processing of pin holes, center holes, and bosses, change the processing flow, and make the processing stable and reliable, thereby improving the processing quality and processing efficiency; The solution adopted by this invention to solve the technical problem is: on the one hand: The present invention provides a device for clamping and fixing multi-layer thin-walled semi-enclosed riveted parts, including a base, a support member mounted on the base for supporting the small end of the multi-layer thin-walled semi-enclosed riveted parts, a positioning pressure plate located above the base for pressing and limiting the large end of the multi-layer thin-walled semi-enclosed riveted parts, and a bracket mounted on the base for mounting the positioning pressure plate; the positioning pressure plate, the support member, and the base are coaxially arranged.

[0004] In some possible implementations, the support includes a support shaft mounted on and screwed to the base, and a support disc mounted on the support shaft; the end of the support shaft away from the base is an arc-shaped surface; a blind hole coaxial with the support disc is provided at the bottom of the support disc; the end of the support shaft away from the base is located in the blind hole.

[0005] In some possible implementations, the support plate has an arc surface on the side away from the support shaft that mates with the small end of the multi-layer thin-walled semi-enclosed riveting component, and a centering shaft that mates with the centering hole of the small end of the multi-layer thin-walled semi-enclosed riveting component.

[0006] In some possible implementations, an adjusting handle is provided on the outside of the support shaft; a nut is provided on the outside of the support shaft for threading; the nut is located between the adjusting handle and the base.

[0007] In some possible implementations, the positioning plate is annular and coaxially arranged with the support member; multiple sets of arc-shaped abutment surfaces are provided on the side of the positioning plate near the large end of the base, which are used to cooperate with the large end of the multi-layer thin-walled semi-enclosed riveting member; and a rectangular notch is provided on the positioning plate and between two adjacent sets of arc-shaped abutment surfaces.

[0008] In some possible implementations, the bracket includes two sets of positioning columns symmetrically arranged along the axis of the support member, and a support column disposed between the two sets of positioning columns; the support column and the positioning column are equidistant from the axis of the support member.

[0009] In some possible implementations, the cross-section of the arc-shaped contact surface is L-shaped; it includes an end face contact surface that abuts against the large end face of the multi-layer thin-walled semi-enclosed riveting component, and an arc-shaped support surface that abuts against the outer side of the large end of the multi-layer thin-walled semi-enclosed riveting component.

[0010] In some possible implementations, the base is disc-shaped and coaxially arranged with the support member. The base is provided with a hollow cavity and two sets of symmetrically arranged U-shaped grooves with openings on opposite sides. The plane of the U-shaped grooves is perpendicular to the plane of the two sets of positioning posts.

[0011] In some possible implementations, the support column is connected to the base and positioning plate by bolts, the positioning column is connected to the base by bolts, one set of positioning columns is provided with positioning pins, and another set of positioning columns is provided with diamond pins; the positioning plate is provided with countersunk holes that cooperate with the center pins and diamond pins.

[0012] on the other hand: This invention provides a method for processing multi-layer thin-walled semi-enclosed riveted parts, based on the above-described device for clamping and fixing multi-layer thin-walled semi-enclosed riveted parts, specifically including the following steps: Step S1: Initial positioning and connection of multi-layer thin-walled semi-enclosed riveted parts; Step S2: Riveting connection of multi-layer thin-walled semi-enclosed riveting parts; Step S3: After riveting, the multi-layer thin-walled semi-enclosed riveted parts are clamped and fixed. Step S4: After clamping and fixing, the multi-layer thin-walled semi-enclosed riveted parts are machined in sequence with pin holes, small end center holes, and large end inner round bosses.

[0013] Compared with the prior art, the beneficial effects of the present invention are as follows: This invention effectively achieves the clamping and fixing of multi-layer thin-walled semi-enclosed riveted parts through the cooperation of positioning pressure plate, base and support components, effectively realizes the precise positioning and clamping of multi-layer thin-walled semi-enclosed riveted parts, greatly improves the machining accuracy of pin holes, center holes and bosses, and effectively ensures the machining quality of products. Compared with the prior art, the present invention can effectively realize the initial positioning connection of multi-layer thin-walled semi-enclosed riveting parts. At the same time, it changes the processing flow compared with the prior art. It allows the riveting of multi-layer thin-walled semi-enclosed riveting parts to be completed after the pin holes and center holes are processed. The use of this processing flow will greatly improve the mutual positional relationship of the pin holes, center holes and bosses in each multi-layer thin-walled semi-enclosed riveting part, thereby further improving the processing quality of the product. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the structure of the present invention; Figure 2 This is a cross-sectional view of the present invention; Figure 3 for Figure 2 Enlarged view of point A in the middle; Figure 4 A schematic diagram of the positioning pressure plate in this invention; Figure 5 This is a schematic diagram of the support disk in this invention; Figure 6 for Figure 5 A sectional view; Figure 7 This is a schematic diagram of the structure after clamping and fixing a multi-layer thin-walled semi-enclosed riveted component using the present invention; in: 1. Base; 11. Hollowed-out cavity; 12. U-shaped groove; 2. Support components; 21. Support shaft; 211. Arc-shaped surface; 212. Adjusting handle; 213. Nut component; 22. Support plate; 221. Blind hole; 222. Curved surface; 223. Centering shaft; 3. Positioning pressure plate; 31. Arc-shaped contact surface; 311. Contact surface; 312. Arc-shaped support surface; 32. Rectangular notch; 4. Bracket; 41. Positioning column; 42. Support column; 100. Multi-layer thin-walled semi-enclosed riveting parts. Detailed Implementation

[0015] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. The terms "first," "second," and similar terms used in this application do not indicate any order, quantity, or importance, but are merely used to distinguish different components. Similarly, "a" or "one," etc., do not indicate a quantity limitation, but rather indicate the existence of at least one. In the implementation of this application, "and / or" describes the association relationship of related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, or B existing alone. In the description of the embodiments of this application, unless otherwise stated, "multiple" means two or more. For example, multiple positioning posts refer to two or more positioning posts. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0016] The present invention will now be described in detail.

[0017] on the one hand: like Figures 1-7 As shown, the present invention provides a device for clamping and fixing multi-layer thin-walled semi-enclosed riveting parts, which is used to clamp and fix the multi-layer thin-walled semi-enclosed riveting parts 100 before the assembly elements are processed; the assembly elements of the multi-layer thin-walled semi-enclosed riveting parts 100 include a pin hole on the mounting seat at the large end of the workpiece, a center hole at the bottom of the small end, and an inner boss in the inner circle of the large end. The assembly includes a base 1, a support member 2 mounted on the base 1 for supporting the small end of the multi-layer thin-walled semi-enclosed riveting component 100, a positioning pressure plate 3 located above the base 1 for pressing and limiting the large end of the multi-layer thin-walled semi-enclosed riveting component 100, and a bracket 4 mounted on the base 1 for mounting the positioning pressure plate 3; the positioning pressure plate 3, the support member 2, and the base 1 are coaxially arranged; the support member 2 is screwed to the base 1. Specifically, when using it, first fix the base 1 on the worktable of the CNC machine tool; Subsequently, the small end of the multi-layer thin-walled semi-enclosed riveting component 100 is installed on the support component 2, and the support component 2 supports and fixes the multi-layer thin-walled semi-enclosed riveting component 100 by cooperating with the centering hole of the small end of the multi-layer thin-walled semi-enclosed riveting component 100. Then, the positioning plate 3 is installed. The positioning plate 3 fits the outer circle of the large end of the multi-layer thin-walled semi-enclosed riveting part 100 to achieve clamping and fixing of the multi-layer thin-walled semi-enclosed riveting part 100. Finally, the pin holes, the small end inner center hole, and the large end inner circle boss can be processed. Compared with the existing technology that adjusts the boss on the large end inner circle to be processed after the component pin holes and center holes are processed, that is, after the annular mounting edge is riveted to the sheet metal part, it is processed in the same state as the pin holes and the center hole. This can greatly improve the mutual positional relationship of each assembly element, especially the mutual positional relationship between the boss and the two pin holes. Meanwhile, by clamping and fixing the multi-layer thin-walled semi-enclosed riveting part 100, this application can achieve clamping and constraint fixing, so that the processed multi-layer thin-walled semi-enclosed riveting part 100 can not only meet the usage requirements and ensure product quality, but also adapt to the mass production of products and improve product processing efficiency.

[0018] In some possible embodiments, the support member 2 includes a support shaft 21 mounted on and screwed to the base 1, and a support disk 22 mounted on and movably connected to the support shaft 21; the end of the support shaft 21 away from the base 1 is an arc-shaped surface 211; a blind hole 221 coaxial with the support disk 22 is provided at the bottom of the support disk 22; the end of the support shaft 21 away from the base 1 is located in the blind hole 221; Specifically, the blind hole 221 in the support plate 22 is a T-shaped hole with an opening at its large end; the support shaft 21 includes a threaded shaft screwed to the base 1, a connecting shaft disposed at the end of the threaded shaft away from the base 1, and a connector with a T-shaped cross-section connected to the side of the connecting shaft away from the threaded post; the large end of the connector is located inside the large end of the T-shaped hole, and the small end of the connector is located inside the small end of the T-shaped hole and connected to the large end of the connector and the connecting shaft; the end of the connector away from the connecting shaft is an arc-shaped surface 211; The height of the support shaft 21 relative to the base 1 is adjusted by the screw connection between the threaded shaft and the base 1, which further ensures the positioning accuracy of the workpiece.

[0019] In some possible implementations, the support disk 22 is provided with an arc surface 222 on the side away from the support shaft 21, which is used to cooperate with the small end of the multi-layer thin-walled semi-enclosed riveting component 100, and a centering shaft 223 is used to cooperate with the centering hole of the small end of the multi-layer thin-walled semi-enclosed riveting component 100; the support disk 22 has a circular structure, and the centering shaft 223 is coaxially arranged with it; In use, the small end of the multi-layer thin-walled semi-enclosed riveting component 100 is effectively supported by the arc surface 222. At the same time, through the cooperation of the centering shaft 223 and the centering hole, the support plate 22 and the multi-layer thin-walled semi-enclosed riveting component 100 form an integral whole, ensuring the positioning stability of the multi-layer thin-walled semi-enclosed riveting component 100. When the position of the support plate 22 is adjusted by cooperating with the arc surface 211 and the blind hole 221, the position of the multi-layer thin-walled semi-enclosed riveting component 100 will be adjusted. Through the cooperation of the arc surface 211 and the blind hole 221, the support plate 22 can swing at a certain angle along the center of the support shaft 21, compensating for the offset of the multi-layer thin-walled semi-enclosed riveting component 100.

[0020] In some possible implementations, in order to effectively adjust the height of the support shaft 21 relative to the base 1 and lock the support shaft 21 after adjustment, an adjustment handle 212 is provided on the outside of the support shaft 21; a nut 213 is provided on the outside of the support shaft 21 for threading; the nut 213 is located between the adjustment handle 212 and the base 1. Specifically, the adjusting handle 212 is connected to the connecting shaft to form a whole. In use, the connecting shaft is rotated by adjusting the adjusting handle 212, which in turn drives the threaded shaft to rotate, thereby adjusting the height of the support shaft 21 and the base 1. Then, the nut 213 is turned so that the nut 213 contacts and abuts against the base 1, thereby fixing and locking the relative position of the support shaft 21 and the base 1. Preferably, the nut 213 and the threaded shaft are fitted with coarse threads, which can meet the requirements with a shorter engagement stroke, reducing the labor intensity of the operator and enabling quick adjustment of the height of the support shaft 21.

[0021] In some possible implementations, the positioning plate 3 is annular and coaxially arranged with the support member 2; multiple sets of arc-shaped abutment surfaces 31 are provided on the side of the positioning plate 3 near the large end of the base 1, which are used to cooperate with the large end of the multi-layer thin-walled semi-enclosed riveting member 100; and a rectangular notch 32 is provided on the positioning plate 3 and between two adjacent sets of arc-shaped abutment surfaces 31. In this application, the positioning pressure plate 3 is set as a ring shape, which can greatly free up space, facilitate operation and observation of the processing status, and also reduce weight, making it convenient for operators to load and unload. It can be moved by hand without hoisting. Furthermore, the arc-shaped contact surface 31 is arc-shaped; the centers of multiple sets of arc-shaped contact surfaces 31 are concentric and located on the straight line of the axis of the threaded shaft, and their diameter matches the outer diameter of the large end of the multi-layer thin-walled semi-enclosed riveting part 100. The rectangular notch 32 is in at least two sets and is set corresponding to the mounting seat on the inner circle of the large end of the multi-layer thin-walled semi-enclosed riveting part 100. It is mainly used to avoid the mounting seat on the inner circle of the large end of the multi-layer thin-walled semi-enclosed riveting part 100, so as to facilitate the processing of pin holes on the mounting seat. When there are three or more sets of rectangular notches 32, the extra rectangular notches 32 will make it easier to observe whether the positioning plate 3 is in contact with the outer end face of the workpiece; like Figure 1 As shown, there are four sets of arc-shaped contact surfaces 31 and four sets of rectangular notches 32.

[0022] In some possible implementations, the bracket 4 includes two sets of positioning columns 41 symmetrically arranged along the axis of the support member 2, and a support column 42 disposed between the two sets of positioning columns 41; the support column 42 and the positioning column 41 are equidistant from the axis of the support member 2. Furthermore, the support column 42 and the positioning column 41 are set at equal intervals to support and fix the positioning pressure plate 3, so that a restricted installation space is formed between the positioning pressure plate 3 and the base 1.

[0023] In some possible implementations, the arc-shaped contact surface 31 has an L-shaped cross-section; it includes an end face contact surface 311 that abuts against the large end face of the multi-layer thin-walled semi-enclosed riveting component 100, and an arc-shaped support surface 312 that abuts against the outer side of the large end of the multi-layer thin-walled semi-enclosed riveting component 100.

[0024] In some possible implementations, in order to facilitate the installation of the base 1 on the worktable of the CNC machine tool and the alignment of the device after it is installed on the worktable, the base 1 is disc-shaped and coaxially arranged with the support member 2. The base 1 is provided with a hollow cavity 11 and two sets of symmetrically arranged U-shaped grooves 12 with openings on opposite sides. The plane of the U-shaped grooves 12 is perpendicular to the plane of the two sets of positioning posts 41.

[0025] The disc-shaped structure facilitates the alignment of the device. The two symmetrically arranged U-shaped grooves 12 are consistent with the T-shaped grooves on the machine tool worktable, which can be quickly aligned during installation and facilitates the installation of the entire device. The center of the base 1 is provided with a through threaded hole that mates with the support shaft 21. The base 1 is also provided with multiple sets of mounting holes that mate with the support column 42 and the positioning column 41 respectively. Furthermore, the outer diameter of the base 1 is consistent with the outer diameter of the positioning plate 3; The hollow cavity 11 will further reduce the weight of the entire device significantly. The centers of multiple sets of mounting holes are at the same distance from the axis of the support shaft 21, ensuring that the center of the multi-layer thin-walled semi-enclosed riveted part 100 after clamping is consistent with the center of the device.

[0026] In some possible implementations, the support column 42 is connected to the base 1 and the positioning plate 3 by bolts, the positioning column 41 is connected to the base 1 by bolts, a set of positioning columns 41 is provided with positioning pins, and another set of positioning columns 41 is provided with diamond pins; the positioning plate 3 is provided with countersunk holes that cooperate with the round pins and diamond pins, and stepped holes that cooperate with the support column 42. The assembly accuracy of the positioning plate 3 is improved by the cooperation of the diamond pin and the positioning pin. The positioning pin is used to accurately position the positioning plate 3, and the diamond pin is used to compensate for the positioning accuracy and prevent over-positioning.

[0027] Furthermore, the diameter of the small end of the stepped hole is larger than the diameter of the small end of the countersunk hole. This setting facilitates the installation of the positioning plate 3 and avoids deviations during the installation of the positioning plate 3.

[0028] on the other hand: This invention provides a method for processing a multi-layer thin-walled semi-enclosed riveted part 100, based on the above-described device for clamping and fixing the multi-layer thin-walled semi-enclosed riveted part 100, specifically including the following steps: Step S1: Initial positioning and connection of multi-layer thin-walled semi-enclosed riveting component 100; Specifically, the outer layer of the multi-layer thin-walled semi-enclosed riveting component 100 is installed on the above-mentioned device, and then the middle layer and inner layer are installed inside the outer layer. Initial positioning is performed according to the assembly relationship of the multi-layer structure in the multi-layer thin-walled semi-enclosed riveting component 100, then it is tightened, and finally a partial riveting connection is performed to lock the relative position of the multi-layer structure. Step S2: Rivet the multi-layer thin-walled semi-enclosed riveting parts 100 after the initial positioning and connection are completed; Step S3: After riveting, the multi-layer thin-walled semi-enclosed riveted part 100 is clamped and fixed using the above-mentioned device; Step S4: After clamping and fixing, the multi-layer thin-walled semi-enclosed riveted part 100 is processed in sequence to form the pin hole, the small end center hole, and the large end inner circle boss.

[0029] In the prior art, the initial positioning of the multi-layer thin-walled semi-enclosed riveted parts 100 is achieved by the operator making multiple adjustments and visually marking lines to ensure their relative positions. This method is extremely inconvenient, inefficient, and results in large fluctuations in the quality of the assembly and riveting. In contrast to the prior art, the present invention uses a device to initially position and tighten the multi-layer assembly relationship before symmetrically riveting the parts locally, locking the relative positions of each part and completing the initial positioning connection, which will greatly improve work efficiency and accuracy. Meanwhile, when using the machining method, it is not necessary to complete the machining of the boss in advance. Instead, the machining is carried out when machining the pin holes and the center hole. At this time, the riveting connection of the multi-layer structure has been completed. The boss is machined in the same state as the pin holes and the center hole. This can greatly improve the relative positional relationship of each assembly element, especially the relative positional relationship between the boss and the two pin holes, thereby greatly improving the machining accuracy and quality.

[0030] This invention is not limited to the specific embodiments described above. The 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 clamping and fixing of multilayer thin-walled semi-enclosed riveted parts, characterized in that, It includes a base, a support member mounted on the base for supporting the small end of the multi-layer thin-walled semi-enclosed riveting component, a positioning plate located above the base for pressing and limiting the large end of the multi-layer thin-walled semi-enclosed riveting component, and a bracket mounted on the base for mounting the positioning plate; the positioning plate, support member, and base are coaxially arranged.

2. A device for clamping and fixing of a multilayer thin-walled semi-enclosed riveted piece according to claim 1, characterized in that, The support component includes a support shaft mounted on and screwed to the base, and a support plate mounted on the support shaft; the end of the support shaft away from the base is an arc-shaped surface; a blind hole coaxial with the support plate is provided at the bottom of the support plate; the end of the support shaft away from the base is located in the blind hole.

3. The device for clamping and fixing multi-layer thin-walled semi-enclosed riveted parts according to claim 2, characterized in that, The support plate has an arc surface on the side away from the support shaft that is used to cooperate with the small end of the multi-layer thin-walled semi-enclosed riveting component, and a centering shaft that is used to cooperate with the centering hole of the small end of the multi-layer thin-walled semi-enclosed riveting component.

4. The device for clamping and fixing multi-layer thin-walled semi-enclosed riveted parts according to claim 2, characterized in that, An adjusting handle is provided on the outside of the support shaft; a nut is provided on the outside of the support shaft and is screwed to it; the nut is located between the adjusting handle and the base.

5. The device for clamping and fixing multi-layer thin-walled semi-enclosed riveted parts according to claim 1, characterized in that, The positioning plate is annular and coaxially arranged with the support member; multiple sets of arc-shaped abutment surfaces are provided on the side of the positioning plate near the large end of the base, which are used to cooperate with the large end of the multi-layer thin-walled semi-enclosed riveting member; and a rectangular notch is provided on the positioning plate and between two adjacent sets of arc-shaped abutment surfaces.

6. The device for clamping and fixing multi-layer thin-walled semi-enclosed riveted parts according to claim 5, characterized in that, The bracket includes two sets of positioning columns symmetrically arranged along the axis of the support member, and a support column arranged between the two sets of positioning columns; the support column and the positioning column are equidistant from the axis of the support member.

7. The device for clamping and fixing multi-layer thin-walled semi-enclosed riveted parts according to claim 5, characterized in that, The arc-shaped contact surface has an L-shaped cross-section; it includes an end face contact surface that abuts against the large end face of the multi-layer thin-walled semi-enclosed riveting component, and an arc-shaped support surface that abuts against the outer side of the large end of the multi-layer thin-walled semi-enclosed riveting component.

8. The device for clamping and fixing multi-layer thin-walled semi-enclosed riveted parts according to claim 6, characterized in that, The base is disc-shaped and coaxially arranged with the support member. The base has a hollow cavity and two sets of symmetrically arranged U-shaped grooves with openings on opposite sides. The plane of the U-shaped grooves is perpendicular to the plane of the two sets of positioning posts.

9. The device for clamping and fixing multi-layer thin-walled semi-enclosed riveted parts according to claim 6, characterized in that, The support column is connected to the base and positioning plate by bolts, and the positioning column is connected to the base by bolts; a set of positioning columns is provided with positioning pins, and another set of positioning columns is provided with diamond pins; the positioning plate is provided with countersunk holes that cooperate with the center pins and diamond pins.

10. A method for processing multi-layer thin-walled semi-enclosed riveted parts, characterized in that, The device for clamping and fixing multi-layer thin-walled semi-enclosed riveted parts according to any one of claims 1-9 specifically includes the following steps: Step S1: Initial positioning and connection of multi-layer thin-walled semi-enclosed riveted parts; Step S2: Riveting connection of multi-layer thin-walled semi-enclosed riveting parts; Step S3: After riveting, the multi-layer thin-walled semi-enclosed riveted parts are clamped and fixed. Step S4: After clamping and fixing, the multi-layer thin-walled semi-enclosed riveted parts are machined in sequence with pin holes, small end center holes, and large end inner round bosses.

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