Clamping device for post-weld machining of aero-engine high-pressure rotor blades

Abstract

The application discloses an aero-engine high-pressure rotor blade post-welding machining clamping device, which comprises a support, a blade tenon clamping mechanism and blade rim plate positioning pieces; two support parts are symmetrically arranged and spaced apart with the vertical center line of the support as a reference on the top of the support; two blade rim plate positioning pieces are respectively detachably fixed on the two support parts on the top of the support, and the relative distance between the two blade rim plate positioning pieces is adjustable; the blade tenon clamping mechanism comprises a clamping block, a locking screw and a locking spring; the clamping block comprises a retractable clamping part, the clamping part is provided with a blade tenon clamping groove, and the clamping block is movably arranged between the two support parts on the top of the support; the support is provided with a mounting hole vertically arranged and extending to the top of the support, the locking screw is threadedly connected with the clamping block after penetrating through the mounting hole, and the locking spring is sleeved on the locking screw and forms a limiting fit in the vertical direction with the mounting hole. The positioning precision is improved, the clamping difficulty is reduced, and the stability of clamping is improved.

Description

Technical Field

[0001] This invention relates to the field of aero-engine blade machining technology, and in particular to a clamping device for post-weld machining of high-pressure rotor blades for aero-engines. Background Technology

[0002] High-pressure rotor blades are critical components of aero engines, and any damage to them can severely impact flight safety. Under the combined effects of high-speed aerodynamic loads, centrifugal loads, and vibration loads, high-pressure rotor blades will develop wear defects at the blade tip after entering service, leading to a reduction in aero engine thrust.

[0003] Additive manufacturing technology can be used to repair worn high-pressure rotor blades. After use, the tenons and blade body of the blades are deformed, requiring post-weld machining to remove the large excess material at the welded joints and to ensure the step dimensions of the weld overlay material on the blade base and blade substrate, as well as the step dimensions of the weld overlay material on the inlet and exhaust sides. However, during machining, the blades are difficult to clamp due to their complex three-dimensional composite curved surfaces, and the clamping and disassembly processes are time-consuming, resulting in low post-weld machining efficiency. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to provide a post-weld machining clamping device for high-pressure rotor blades of aero-engines with high clamping efficiency and accurate clamping positioning.

[0005] To solve the above-mentioned technical problems, the technical solution adopted by the present invention is: a post-weld machining clamping device for high-pressure rotor blades of aero-engines, including a support, a blade tenon clamping mechanism, and blade edge plate positioning pieces; the top of the support is fixed with two support parts symmetrically arranged and spaced apart from each other with the vertical center line of the support as a reference; the number of blade edge plate positioning pieces is two, and the two blade edge plate positioning pieces are detachably fixed on the two support parts on the top of the support, and the relative distance between the two blade edge plate positioning pieces is adjustable; the blade tenon clamping mechanism includes a clamping block, a locking screw, and a locking spring; the clamping block includes a retractable clamping part, and the clamping part is provided with a blade tenon clamping groove, and the clamping block is movably arranged between the two support parts on the top of the support; the support is provided with a vertically arranged mounting hole extending to the top of the support, the locking screw passes through the mounting hole and is threadedly connected to the clamping block, and the locking spring is sleeved on the locking screw and forms a vertical limiting fit with the mounting hole. This invention uses a blade tenon clamping mechanism to clamp the blade tenons of aero-engine high-pressure rotor blades. The clamping and disassembly of the blade tenons are achieved through the contraction and expansion of the clamping portion in the clamping block. Simultaneously, the locking spring and locking screw work together to provide a locking force to the clamping block, ensuring stable clamping and fixing of the blade tenons. Furthermore, this invention provides a support portion at the top of the support to fix and support the blade edge positioning plates. The support portion forms a good fit with the hopper, and the blade edge positioning plates support the blade edge plates of the high-pressure rotor blades after the blade tenons are clamped and fixed. Through the clamping of the blade tenons, the support of the blade edge plates, and the downward pull provided by the compression of the locking spring to the locking screw and clamping block, a stable fixing effect is provided for the entire high-pressure rotor blade.

[0006] As an improvement to the above solution: the support portion at the top of the support is provided with a threaded hole, and the blade rim positioning plate is provided with an adjustment hole that mates with the threaded hole. The adjustment hole is an elongated oval hole with a length greater than the diameter of the threaded hole. The blade rim positioning plate is detachably connected to the support portion via an adjustment screw that mates with the threaded hole. This invention achieves a detachable connection between the adjustment hole on the blade rim positioning plate and the threaded hole on the support portion through the engagement of the adjustment hole, facilitating assembly. By moving the blade rim positioning plate to change the engagement position between the adjustment hole and the threaded hole, the installation position of the blade rim positioning plate can be changed, thereby adjusting the relative distance between the two blade rim positioning plates. This allows the invention to meet the fixing and support requirements of high-pressure rotor blades of different sizes and specifications, thus improving the applicability of the invention.

[0007] As an improvement to the above solution: the top of the support portion is provided with a raised slide bar, which is located in the middle of the support portion and extends along the width direction of the support portion. The lower surface of the blade rim positioning piece is provided with a groove that slides with the slide bar. This invention achieves the movement of the blade rim positioning piece by setting a sliding engagement mechanism composed of the slide bar and the groove. This improves the ease of movement of the blade rim positioning piece while limiting its movement path to ensure that no offset occurs when adjusting the spacing of the blade rim positioning pieces. It also provides rapid positioning during the assembly of the blade rim positioning piece onto the support portion.

[0008] As an improvement to the above solution: the upper surface edge of the blade rim positioning piece is provided with a limiting step, and the limiting steps of the two blade rim positioning pieces are arranged opposite to each other. This invention, by setting limiting steps on the blade rim positioning pieces to adapt to the shape of the blade rim, forms a more suitable fit between the limiting steps and the edge of the blade rim. The limiting steps on the two blade rim positioning pieces form a limiting fit on both sides of the blade rim, preventing displacement during blade machining and further improving the clamping effect on the high-voltage rotor blades.

[0009] As an improvement to the above solution, a limiting piece is also included, which forms a limiting fit with the end of the clamping block and is detachably connected to the support. This invention prevents the clamping block from exceeding the support range by setting a limiting piece at the first and second ends of the clamping block.

[0010] As an improvement to the above solution, it also includes a base detachably connected to the bottom of the support, with a robotic arm connection groove at the bottom of the base. By installing a base at the bottom of the support as a connecting component between the entire clamping device and the robotic arm, this invention enables rapid assembly and disassembly of the clamping device and the robotic arm, thereby reducing the assembly difficulty of the clamping device, saving assembly time, and improving clamping efficiency.

[0011] The beneficial effects of this invention are as follows: This invention uses a blade tenon clamping mechanism to clamp the blade tenon of aero-engine high-pressure rotor blades. The clamping and disassembly of the blade tenon is achieved through the contraction and expansion of the clamping part in the clamping block. Simultaneously, the cooperation of the locking spring and locking screw provides a locking force to the clamping block, achieving stable clamping and fixing of the blade tenon. This invention also uses a support part at the top of the support to fix and support the blade edge positioning plate. The support part forms a good fit with the hopper. The blade edge positioning plate can support the blade edge plate of the high-pressure rotor blade after the blade tenon is clamped and fixed. The clamping of the blade tenon, the support of the blade edge plate, and the downward pull provided by the compression of the locking spring to the locking screw and clamping block provide a stable fixing effect for the entire high-pressure rotor blade. This invention enables free adjustment of the positioning of the high-pressure rotor blade in different directions (up / down, front / back, left / right) during clamping, effectively improving the positioning accuracy, reducing the clamping difficulty, and improving the clamping stability during high-pressure rotor blade clamping. It also reduces the operator's labor intensity and improves the machining quality and efficiency of the high-pressure rotor blade. Attached Figure Description

[0012] Figure 1 This is a front view of the present invention;

[0013] Figure 2 This is a rear view of the present invention;

[0014] Figure 3 This is a cross-sectional view of the present invention;

[0015] Figure 4 This is a top view of the present invention;

[0016] Figure 5 This is a top view of the support in this invention;

[0017] Figure 6 This is a top view of the blade edge plate positioning piece in this invention;

[0018] Figure 7 This is a bottom view of the blade edge plate positioning piece in this invention.

[0019] The markings in the diagram are as follows: 100-support, 110-support part, 120-slide bar, 200-blade tenon clamping mechanism, 210-clamping block, 220-locking screw, 230-locking spring, 300-blade edge plate positioning piece, 310-adjustment hole, 320-slide groove, 330-limiting step, 400-limiting piece, 500-base, 510-mechanical arm connecting groove. Detailed Implementation

[0020] To facilitate understanding of the present invention, the invention will be further described below with reference to the accompanying drawings.

[0021] In the description of this invention, it should be noted that the terms "front", "rear", "left", "right", "up", "down", "inner", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of description, and do not indicate or imply that the device or component referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this invention.

[0022] like Figures 1 to 3 As shown, the post-weld machining clamping device for high-pressure rotor blades of aero-engines disclosed in this invention includes a support 100, a blade tenon clamping mechanism 200, a blade rim positioning plate 300, a limiting plate 400, and a base 500. The support 100 serves as the basic component of the entire clamping device, and the blade tenon clamping mechanism 200, the blade rim positioning plate 300, the limiting plate 400, and the base 500 are all mounted on the support 100. The blade tenon clamping mechanism 200 clamps the blade tenons of the high-pressure rotor blades by means of clamping. The clamping mechanism 200 provides downward tension to the clamped high-pressure rotor blades, while the blade edge plate positioning plate 300 supports the blade edge plate and provides upward support to the high-pressure rotor blades. The limiting plate 400 limits the clamping block 210 in the blade tenon clamping mechanism 200, and the limiting plate 400 can be fixed to the support 100 by a threaded connection. The base 500 serves as the receiving component between the clamping device and the robotic arm, and is used to assemble the clamping device on the robotic arm. Based on the clamping and fixing of the blade tenon of the high-pressure rotor blade using the blade tenon clamping mechanism 200, this invention enhances the fixing effect of the high-pressure rotor blade by using the upward support force applied to the blade edge plate by the blade edge plate positioning plate 300 and the downward tension force applied to the blade tenon by the blade tenon clamping mechanism 200.

[0023] Specifically, such as Figure 3As shown, the blade tenon clamping mechanism 200 used in this invention consists of a clamping block 210, a locking screw 220, and a locking spring 230. The clamping block 210 clamps the blade tenon through a retractable clamping part. A blade tenon clamping groove adapted to the shape of the blade tenon is provided on the opposite surface of the clamping part. The retraction and expansion of the clamping part is achieved by the locking screw 220. The upper half of the locking screw 220 is provided with an external thread. The clamping part is threadedly connected to the locking screw 220. By rotating the locking screw 220, the clamping part can be driven to retract and expand to achieve clamping and disassembly of the blade tenon. Since the clamping block 210 used in this invention is a mature and universal clamping structure in the field, it can be applied to the clamping work of high-voltage rotor blades of different levels, and will not be described in detail here. The support 100 is provided with a vertically arranged mounting hole that extends from the bottom to the top of the support 100. The locking screw 220 and the locking spring 230 are located in the mounting hole. The end of the locking screw 220 with external threads extends upward to the outside of the mounting hole and is threadedly connected to the clamping block 210 above. The lower end of the locking screw 220 extends downward to the outside of the mounting hole and is equipped with a handwheel structure so that the operator can hold and rotate the locking screw 220 for adjustment. The locking spring 230 is sleeved on the locking screw 220. A stepped structure is provided at the upper end of the mounting hole, and a handwheel structure fixed at the lower end of the locking screw 220 limits the locking spring 230 from both ends. By rotating the locking screw 220, the locking spring 230 can be pressed onto the stepped structure. At this time, the compressed locking spring 230 can provide a downward elastic force to the locking screw 220, thereby providing a downward tension force to the clamp 210 connected to the upper end of the locking screw 220.

[0024] Specifically, such as Figures 1 to 5 As shown, the present invention installs a blade rim plate positioning piece 300 on the top of the support 100 to support the blade rim plate of the high-pressure rotor blade after the blade tenon of the high-pressure rotor blade is clamped and fixed by the blade tenon clamping mechanism 200. The blade rim plate positioning piece 300 is as follows: Figure 6 and Figure 7The plate structure shown has an adjustment hole 310 on the blade positioning piece 300. Two support plates 110 for mounting the blade edge plate positioning pieces 300 are fixed to the top of the support 100. The two support plates 110 are symmetrically arranged with respect to the vertical center line of the support 100 and spaced apart from each other. The clamping block 210 in the blade tenon clamping mechanism 200 is located within the space formed by the two support plates 110. The two blade edge plate positioning pieces 300 are respectively mounted on the top of the two support plates 110. The support plate 110 has threaded holes that mate with the adjustment holes 310 on the blade edge plate positioning pieces 300. The blade edge plate positioning pieces 300 can be locked and fixed to the corresponding support plates 110 by adjusting screws that are threaded into the threaded holes. When the blade tenon of the high-pressure rotor blade is clamped and fixed by the blade tenon clamping mechanism 200, the blade edge plate positioning piece 300 fixed on the support part 110 can support the blade edge plate of the high-pressure rotor blade. By applying an upward supporting force and the downward tensioning force applied by the blade tenon clamping mechanism 200, the clamping device can improve the fixing effect of the high-pressure rotor blade. By rotating the locking screw 220 to change the pressing effect on the locking spring 230, the magnitude of the applied locking force can be adjusted.

[0025] Furthermore, in this invention, the adjustment hole 310 on the blade edge plate positioning piece 300 is set as an elongated hole with a length greater than the diameter of the threaded hole on the support part 110. This allows the spacing between the two blade edge plate positioning pieces 300 to be adjusted by changing the installation position of the blade edge plate positioning piece 300 on the support part 110. Thus, the position of the two blade edge plate positioning pieces 300 can be adjusted according to the size of the supported blade edge plate to meet the fixing requirements of high-pressure rotor blades of different specifications and different grades.

[0026] Furthermore, in this invention, the translation of the blade edge plate positioning piece 300 on the support portion 110 is achieved through a sliding fit, such as... Figure 5 and Figure 7 As shown, a raised slide bar 120 is provided on the top of the support portion 110. The slide bar 120 is located in the middle of the support portion 110 and extends along the width direction of the support portion 110. At the same time, a sliding groove 320 is provided on the lower surface of the blade rim positioning piece 300, which forms a sliding engagement with the slide bar 120. When adjusting the position of the blade rim positioning piece 300, the blade rim positioning piece 300 moves along the slide bar 120 to ensure that the position of the blade rim positioning piece 300 does not become skewed. At the same time, when installing the blade rim positioning piece 300 on the support portion 110, the engagement of the slide bar 120 and the sliding groove 320 can achieve a quick positioning function.

[0027] Furthermore, such as Figures 1 to 3 as well as Figure 6As shown, the present invention provides a limiting step 330 on the upper surface edge of the blade rim positioning piece 300, and the limiting steps 330 of the two blade rim positioning pieces 300 are arranged opposite to each other. By improving the structure of the blade rim positioning piece 300, the limiting step 330 forms a limiting fit relationship between the two sides of the blade rim, avoiding displacement during the machining of the high-pressure rotor blade, thereby improving the clamping effect of the high-pressure rotor blade.

[0028] To enable rapid assembly and disassembly of the entire gripping device on the robotic arm, such as Figures 1 to 3 As shown, the present invention has a base 500 installed at the bottom of the support 100. Threaded holes are provided on both the upper and lower end faces of the base 500. The upper end face of the base 500 is connected to the bottom of the support 100, and a robotic arm connection groove 510 is provided on the lower end face of the base 500. Assembly with the robotic arm is achieved through a retractable movable block that cooperates with the robotic arm connection groove 510.

Claims

1. A clamping device for post-weld machining of high-pressure rotor blades for aero-engines, characterized in that: The system includes a support (100), a blade tenon clamping mechanism (200), and blade edge plate positioning pieces (300). The top of the support (100) is fixed with two support parts (110) symmetrically arranged and spaced apart from each other, with the vertical center line of the support (100) as the reference. There are two blade edge plate positioning pieces (300), each detachably fixed to one of the two support parts (110) on the top of the support (100), and the relative distance between the two blade edge plate positioning pieces (300) is adjustable. The blade tenon clamping mechanism (200)... It includes a clamping block (210), a locking screw (220), and a locking spring (230); the clamping block (210) includes a retractable clamping part, and the clamping part is provided with a blade tenon clamping groove. The clamping block (210) is movably disposed between two support parts (110) at the top of the support (100); the support (100) is provided with a vertically arranged mounting hole that extends to the top of the support (100). The locking screw (220) passes through the mounting hole and is threadedly connected to the clamping block (210). The locking spring (230) is sleeved on the locking screw (220) and forms a vertical limiting fit with the mounting hole. The support portion (110) at the top of the support (100) is provided with a threaded hole, and the blade edge positioning piece (300) is provided with an adjustment hole (310) that matches the threaded hole. The adjustment hole (310) is an elongated hole with a length greater than the diameter of the threaded hole. The blade edge positioning piece (300) is detachably connected to the support portion (110) through an adjustment screw that matches the threaded hole. The top of the support portion (110) is provided with a protruding slide bar (120). The slide bar (120) is located in the middle of the support portion (110) and extends along the width direction of the support portion (110). The lower surface of the blade edge positioning piece (300) is provided with a sliding groove (320) that slides with the slide bar (120). The upper surface edge of the blade edge positioning piece (300) is provided with a limiting step (330). The limiting steps (330) of the two blade edge positioning pieces (300) are arranged opposite to each other.

2. The post-weld machining clamping device for high-pressure rotor blades of aero-engines as described in claim 1, characterized in that: It also includes a limiting piece (400) disposed on the top of the support (100), the limiting piece (400) forming a limiting engagement with the end of the clamping block (210) and being detachably connected to the support (110).

3. The post-weld machining clamping device for high-pressure rotor blades of aero-engines as described in claim 1 or 2, characterized in that: It also includes a base (500) that is detachably connected to the bottom of the support (100), and the bottom of the base (500) is provided with a mechanical arm connection groove (510).

Images