CN-122012879-A - Ultrasonic profiling extrusion strengthening device and method for turbine disk mortises

CN122012879ACN 122012879 ACN122012879 ACN 122012879ACN-122012879-A

Abstract

The application discloses a turbine disk mortise ultrasonic profiling extrusion strengthening device and a method, wherein the device comprises an ultrasonic vibration assembly, a dynamic vibration assembly and a dynamic vibration assembly, wherein the ultrasonic vibration assembly is used for providing ultrasonic vibration and static extrusion force which are transmitted along the axial direction; the profiling extrusion assembly is arranged at the output end of the ultrasonic vibration assembly and comprises an extrusion head, a clamping assembly and at least one bulge, wherein the extrusion head is provided with a non-circular section profile matched with the profile of the inner wall of a mortice of a turbine disc to be processed, the clamping assembly is used for positioning and clamping the turbine disc, and the bulge is arranged on the side surface of the extrusion head and is used for extruding the side wall of the mortice when the extrusion head axially feeds along the mortice so as to convert the ultrasonic vibration and static extrusion force propagating along the axial direction into extrusion force along the normal direction of the side wall of the mortice. The application can solve the problems that the prior ultrasonic rolling and hole extrusion technology has poor space adaptability when processing the structure of the mortise of the turbine disk, the load is difficult to apply along the normal direction of the side wall of the mortise, and the side wall is difficult to effectively strengthen, and the like.

Inventors

SUN ZHAOXING
YANG YE
YAO SHULEI
ZHU XIANHAO
CHENG LVYI

Assignees

上海锐莱森掣机械设备研发有限责任公司

Dates

Publication Date: 20260512
Application Date: 20260213

Claims (10)

1. The utility model provides a turbine dish tongue-and-groove supersound profile modeling extrusion strengthening device which characterized in that includes: An ultrasonic vibration assembly for providing an ultrasonic vibration and a static compressive force propagating along an axial direction; The profiling extrusion assembly is arranged at the output end of the ultrasonic vibration assembly and comprises an extrusion head, wherein the extrusion head is provided with a non-circular section profile matched with the profile of the inner wall of a mortice of a turbine disc to be processed; a clamping assembly for positioning and clamping the turbine disk; The extrusion device comprises an extrusion head, wherein the side surface of the extrusion head is provided with at least one protruding part, and the protruding part is used for extruding the side wall of the mortise when the extrusion head axially feeds along the mortise so as to convert the ultrasonic vibration and static extrusion force propagating along the axial direction into extrusion force along the normal direction of the side wall of the mortise.
2. The ultrasonic profiling extrusion strengthening device for the turbine disc mortise of claim 1, wherein the protruding portion comprises a plurality of protruding shells, the protruding shells are sequentially arranged from the insertion end of the extrusion head along the axial direction of the extrusion head, and the protruding heights of the protruding shells are sequentially increased in an increasing mode and are arranged in a multi-stage step-shaped mode.
3. The ultrasonic profiling extrusion strengthening device for the turbine disc mortise of claim 1, wherein the clamping assembly comprises a base, lateral clamping mechanisms and a pressing plate mechanism, the lateral clamping mechanisms are arranged on two sides of the turbine disc and used for vertically limiting the turbine disc, the lateral clamping mechanisms are in transmission fit with the pressing plate mechanism through a wedge-shaped transmission mechanism, the wedge-shaped transmission mechanism comprises a wedge-shaped upper pressing plate with a first inclined surface and a wedge-shaped lower pressing plate with a second inclined surface, the first inclined surface is in contact with the second inclined surface, and the lateral clamping mechanisms are used for applying lateral thrust to the wedge-shaped upper pressing plate so that the wedge-shaped upper pressing plate moves along the contact surface of the first inclined surface and the second inclined surface to convert the lateral thrust into vertical pressing force.
4. The ultrasonic profiling extrusion strengthening device for the turbine disc mortise according to claim 3 is characterized in that the lateral clamping mechanism comprises two jacking blocks and a fastening screw, wherein the jacking blocks are slidably arranged on the base and are respectively positioned on two sides of the wedge-shaped upper pressing plate, the fastening screw penetrates through one jacking block and is in threaded connection with the other jacking block, and the fastening screw is used for driving the two jacking blocks to be close to each other so as to apply lateral thrust to the wedge-shaped upper pressing plate.
5. The ultrasonic profiling extrusion strengthening device for the turbine disc mortise of claim 3, wherein the clamping assembly further comprises a center positioning block arranged on the base, and the center positioning block is positioned between the wedge-shaped lower pressing plates at two sides and used for limiting the installation position of the wedge-shaped lower pressing plates.
6. The ultrasonic profiling extrusion strengthening device for the turbine disc mortises is characterized in that an expansion sleeve head is arranged at the output end of the ultrasonic vibration assembly, the profiling extrusion assembly further comprises an expansion core chuck connected with the extrusion head, and the expansion sleeve head is fixedly connected with the expansion core chuck.
7. The ultrasonic profiling extrusion strengthening device for the tenon and mortise of the turbine disc according to claim 6, wherein a key groove is formed in one side of the inner wall of the extrusion head along the axial direction, a circumferential limit key is arranged at a corresponding position on the periphery of the expansion core chuck, and the circumferential limit key is embedded in the key groove.
8. The ultrasonic profiling extrusion strengthening device for the turbine disk mortises, as claimed in claim 1, wherein the non-circular cross-section profile of the extrusion head is dovetail-shaped or fir-tree-shaped, and the surface of the protruding part is provided with an arc transition chamfer.
9. A method of ultrasonic profiling extrusion strengthening of a turbine disk dovetail slot using the apparatus of any one of claims 1 to 8, comprising: clamping a turbine disc to be processed in a clamping assembly for positioning and clamping; according to the tongue-and-groove shape characteristics of the turbine disc, a matched profiling extrusion assembly is selected to be mounted on the ultrasonic vibration assembly; Starting the ultrasonic vibration assembly, enabling the ultrasonic vibration assembly to provide ultrasonic vibration and static extrusion force which are transmitted along the axial direction, and enabling the profiling extrusion assembly to axially move along the mortise at a preset feeding speed; And extruding the side wall of the mortise by utilizing the convex part on the surface of the extrusion head, and converting the provided static extrusion force and ultrasonic vibration which are propagated along the axial direction into extrusion force along the normal direction of the side wall of the mortise, so that the side wall material of the mortise is subjected to plastic deformation.
10. The ultrasonic profiling extrusion strengthening method of the turbine disc mortise of claim 9, wherein the clamping the turbine disc to be processed in the clamping assembly for positioning and clamping comprises: The pressing plate mechanism of the clamping assembly is adjusted to perform vertical preliminary positioning on the turbine disc; And the lateral clamping mechanism of the clamping assembly is adjusted, and lateral thrust is applied to the wedge-shaped transmission mechanism of the clamping assembly so as to vertically compress the turbine disc.

Description

Ultrasonic profiling extrusion strengthening device and method for turbine disk mortises Technical Field The application relates to the technical field of surface strengthening, in particular to a turbine disk tongue-and-groove ultrasonic profiling extrusion strengthening device and method. Background ‌ Turbine disks are important rotating components in aircraft engines that are subjected to the combined action of high cycle fatigue loads, large centrifugal loads, and complex thermal cycling loads over a long period of time during service, placing extremely high demands on structural integrity and surface quality. The mortise, which is a connection structure between the turbine disk and the blade, has a complex shape and concentrated stress, and is one of weak areas where fatigue cracks are most likely to initiate and propagate. Numerous engineering practices and failure analysis results indicate that the level of surface integrity of the tongue-and-groove area determines, to a large extent, the fatigue life and service safety of the turbine disk. At present, the ultrasonic rolling technology is mature in application in the external surface strengthening of shafts, discs and the like. However, existing ultrasonic rolling or ultrasonic extrusion devices often employ axial output with enhanced loading and ultrasonic vibration substantially coincident with the tool head axis. When the device is applied to concave and narrow structures such as a turbine disk mortise, the internal space of the mortise is limited, a conventional rolling head or a conventional extrusion head is difficult to smoothly enter and apply required load, and the normal direction of the side wall of the mortise is inconsistent with the axial direction of ultrasonic vibration, so that the conventional device is difficult to apply enough normal strengthening load to the side wall of the mortise, and uniform strengthening of the mortise cannot be realized. In addition, the hole extrusion strengthening technology is mainly aimed at regular round holes, and is not suitable for complex non-axisymmetric structures such as mortises and the like. At present, a special device capable of carrying out ultrasonic extrusion strengthening on a tongue-and-groove structure and considering workpiece clamping stability and machining efficiency is not yet available. Disclosure of Invention The application provides a turbine disc mortise ultrasonic profiling extrusion strengthening device and method, which are used for solving the problems that the existing ultrasonic rolling and hole extrusion technology is poor in space adaptability and difficult to apply load along the normal direction of the mortise side wall when a turbine disc mortise structure is machined, so that the side wall is difficult to effectively strengthen and the like. In order to achieve the above purpose, the present application provides the following technical solutions. According to a first aspect of the application, an embodiment of the application provides a turbine disk dovetail ultrasonic profiling extrusion strengthening device, which comprises an ultrasonic vibration assembly, a profiling extrusion assembly, a clamping assembly and a clamping assembly, wherein the ultrasonic vibration assembly is used for providing ultrasonic vibration and static extrusion force which are transmitted along the axial direction, the profiling extrusion assembly is arranged at the output end of the ultrasonic vibration assembly and comprises an extrusion head, the extrusion head is provided with a non-circular section profile matched with the contour of the inner wall of a dovetail groove of a turbine disk to be machined, the clamping assembly is used for positioning and clamping the turbine disk, at least one protruding part is arranged on the side surface of the extrusion head, and the protruding part is used for extruding the side wall of the dovetail groove when the extrusion head is fed along the axial direction of the dovetail groove so as to convert the ultrasonic vibration and static extrusion force which are transmitted along the axial direction into extrusion force along the normal direction of the side wall of the dovetail groove. In some possible embodiments, the protruding part comprises a plurality of protruding shells, the protruding shells are sequentially arranged from the insertion end of the extrusion head along the axial direction of the extrusion head, and the protruding heights of the protruding shells are sequentially increased and are in multi-stage ladder-shaped arrangement. In some possible embodiments, the clamping assembly comprises a base, lateral clamping mechanisms and a pressing plate mechanism, wherein the lateral clamping mechanisms are arranged on two sides of the turbine disc and used for vertically limiting the turbine disc, the lateral clamping mechanisms are in transmission fit with the pressing plate mechanism through a wedge-shaped transmission mechanism, the we