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CN-122016420-A - Adjustable foreign object impact damage preparation device and preparation method thereof

CN122016420ACN 122016420 ACN122016420 ACN 122016420ACN-122016420-A

Abstract

The present disclosure provides a foreign object impact damage preparation device and a preparation method thereof. The preparation device comprises an impact part, a triggering part, a pressure part and a pressure part, wherein the side surface of the impact part is provided with a bayonet, the triggering part comprises a bearing seat, a pre-tightening piece and an elastic clamping piece, the relative position of the bearing seat and the test piece in the z direction is fixed, the pre-tightening piece is fixedly connected with the bearing seat and can pre-tighten the elastic clamping piece in the vertical z direction in an adjustable mode, the elastic clamping piece is in contact with the pre-tightening piece at a first end so as to be pre-tightened, a curved surface protruding part is arranged at a second end so as to be elastically clamped with the bayonet of the impact part, the impact part is clamped with the elastic clamping piece and keeps the relative position in the z direction with the test piece in a state to be triggered, and the impact part receives pressure, is separated from the clamping with the elastic clamping piece and impacts the test piece in the z direction in the triggering state.

Inventors

  • HE HONG
  • HAN JING
  • LIU LIU

Assignees

  • 中国航发商用航空发动机有限责任公司

Dates

Publication Date
20260512
Application Date
20241108

Claims (15)

  1. 1. A foreign object impact damage preparation device (1), characterized by comprising: an impact part (11) provided with a bayonet (111) on the side surface; a trigger part (12) comprising a bearing seat (121), a pre-tightening piece (122) and an elastic clamping piece (123); Wherein the relative positions of the bearing seat (121) and the test piece in the z direction are fixed; the elastic clamping piece (123) is contacted with the pre-tightening piece (122) at a first end so as to be pre-tightened, and a curved surface protruding part (1233) is arranged at a second end so as to be elastically clamped with the bayonet (111) of the impact part (11); the impact part (11) is clamped with the elastic clamping piece (123) and keeps the relative position in the z direction with the test piece in a state to be triggered, and the impact part (11) receives pressure, is separated from the clamping with the elastic clamping piece (123) and impacts the test piece in the z direction in a state to be triggered.
  2. 2. The preparation device (1) according to claim 1, wherein the pretensioning element (122) is provided with impact force graduation marks for determining the impact force threshold F from the deformation h of the elastic clamping element (123), with the following relation: Wherein α is a correction coefficient, K 1 is an elastic coefficient of the elastic clip (123), R 1 is a radius of the bayonet (111), and R 2 is a radius of the curved protrusion (1233).
  3. 3. The manufacturing device (1) according to claim 1, wherein the bearing seat (121) is provided with a first through hole (1211) in the z direction and a first threaded hole (1212) in the vertical z direction, the first threaded hole (1212) extends to the side wall of the first through hole (1211), the pre-tightening piece (122) is a pre-tightening bolt and is matched with the first threaded hole (1212), the elastic clamping piece (123) comprises a first spring (1231) and a metal ball (1232) and is arranged in the first threaded hole (1212), and the impact part (11) penetrates through the first through hole (1211).
  4. 4. The preparation device (1) according to claim 1, wherein the impact portion (11) comprises an impact pin (112) and an impact head (113), the impact head (113) being hinged to the impact pin (112) and comprising a plurality of damaging indenters (1131) extending radially along the rotation axis (b).
  5. 5. The manufacturing apparatus (1) of claim 4, wherein the plurality of damage heads (1131) comprises at least one of a linear damage head (1132), a conical damage head (1133), a spherical damage head (1134), and a square damage head (1135).
  6. 6. The preparation device (1) according to claim 1, comprising a base (13) for positioning the test piece, the base (13) comprising a mounting plate (141), the mounting plate (141) being adapted to provide a mounting position in z-direction for the trigger part (12) of the test piece, the mounting plate (141) being provided with a second through hole (1411) communicating with the first through hole (1211) for the passage of the trigger part (12).
  7. 7. The preparation device (1) according to claim 6, wherein the base (13) comprises a compression bar (142), the compression bar (142) being z-displaceable relative to the trigger portion (12) and being connected to the impact portion (11) by a second spring (144) for providing a compression force.
  8. 8. The preparation device (1) according to claim 6, wherein a positioning groove (114) is formed on the side surface of the impact portion (11), and a boss (1412) which is matched with the positioning groove (114) is formed inside the second through hole (1411).
  9. 9. The preparation device (1) according to claim 6, wherein the base (13) comprises an x-direction adjusting screw (132), an x-direction sliding table (133), a y-direction adjusting screw (134) and a y-direction sliding table (135); The base (13) is provided with an x-direction sliding groove (131) matched with the x-direction sliding table (133), an end wall surface (1311) of the x-direction sliding groove (131) is provided with an x-direction screw positioning hole (1312), an x-direction adjusting screw (132) penetrates through the x-direction screw positioning hole (1312) and is fixedly connected with the x-direction sliding table (133), the x-direction sliding table (133) is provided with a y-direction sliding groove (1331) matched with the y-direction sliding table (135), an end wall surface (1332) of the y-direction sliding groove (1331) is provided with a y-direction screw positioning hole (1333), and the y-direction adjusting screw (134) penetrates through the y-direction screw positioning hole (1333) and is fixedly connected with the y-direction sliding table (135).
  10. 10. The preparation device (1) according to claim 9, wherein the y-direction sliding table (135) is provided with a rectangular placing groove (1351) for positioning the test piece and a runway-shaped fixing groove (1352) for fixing the test piece.
  11. 11. A preparation method for a preparation device (1) as claimed in any one of claims 1 to 10, characterized by comprising: Adjusting the pretensioner (122) to set an impact force; Enabling the state to be triggered to be reached; The pressure is provided progressively until the trigger condition is reached.
  12. 12. The method of manufacturing according to claim 11, wherein the pre-tightening member (122) is provided with impact force graduation marks for determining an impact force threshold F from the deformation h of the elastic clamping member (123), the method of manufacturing comprising: The pretensioning element (122) is adjusted to align the set impact force graduation marks.
  13. 13. The method according to claim 11, wherein the impact portion (11) comprises an impact pin (112) and an impact head (113), the impact head (113) being hinged to the impact pin (112) and comprising a plurality of damage rams (1131) extending radially along a rotation axis (b), wherein the method comprises: and selecting the damage ram (1131).
  14. 14. The method of manufacturing as claimed in claim 11, wherein the manufacturing device (1) comprises a base (13) for positioning a test piece, wherein the base (13) comprises a compression bar (142), wherein the compression bar (142) is z-displaceable relative to the trigger part (12) and is connected to the impact part (11) by a second spring (144) for providing a pressure, wherein the method of manufacturing comprises: positioning the test piece to the base (13); lifting the pressure lever (142) to the to-be-triggered state; the plunger (142) is depressed progressively until the trigger condition is reached.
  15. 15. The method according to claim 14, wherein the base (13) comprises an x-direction adjusting screw (132), an x-direction sliding table (133), a y-direction adjusting screw (134) and a y-direction sliding table (135), wherein the base (13) is provided with an x-direction sliding groove (131) matched with the x-direction sliding table (133), an end wall surface (1311) of the x-direction sliding groove (131) is provided with an x-direction screw positioning hole (1312), the x-direction adjusting screw (132) passes through the x-direction screw positioning hole (1312) and is fixedly connected with the x-direction sliding table (133), the x-direction sliding table (133) is provided with a y-direction sliding groove (1331) matched with the y-direction sliding table (135), an end wall surface (1332) of the y-direction sliding groove (1331) is provided with a y-direction screw positioning hole (1333), and the y-direction adjusting screw (134) passes through the y-direction screw positioning hole (1333) and is fixedly connected with the y-direction sliding table (135), and the method comprises: Adjusting the x-direction adjustment screw (132) to position the test piece in the x-direction and/or adjusting the y-direction adjustment screw (134) to position the test piece in the y-direction.

Description

Adjustable foreign object impact damage preparation device and preparation method thereof Technical Field The disclosure relates to the technical field of aeroengines, in particular to an adjustable foreign object impact damage preparation device and a preparation method thereof. Background During the service process of an aeroengine, some external environment substances (such as gravel, metal, stones, plastics and the like on a runway) can be sucked by strong airflow pressure, so that the engine blade is impacted by foreign objects to generate damage, such as pits, notches and the like, and the size and the shape of the damage characteristics are different. The damage characteristic can generate larger stress concentration, and the fatigue resistance of the blade is obviously reduced under the comprehensive actions of temperature load, centrifugal force, pneumatic load and the like, so that the service safety and the service life of the aeroengine are affected. In order to ensure the reliability and economy of the aeroengine, the research of the influence of foreign object impact damage on the fatigue performance of the blade is necessary to be carried out, and how to realize the effective preparation of impact damage with specific size and shape is a key link for carrying out the research. Disclosure of Invention The inventor has found through intensive research that the technology for obtaining the damage characteristics of foreign objects through laboratory simulation mainly comprises a machining method, a quasi-static extrusion method, a pendulum impact method, an air cannon method and the like, and each method has advantages and disadvantages. Machining methods remove material by a cutting tool to produce damaged features. The method can effectively control the size and morphological characteristics of the damage characteristics, and has good repeatability. However, the defect is that the formation mechanism of the damage characteristic is different from the damage characteristic generated in actual service, and the damage characteristic is greatly different. The quasi-static extrusion method prepares the damage characteristic by controlling the extrusion depth of the pressure head. The method can effectively control the size and morphological characteristics of the damage characteristic through the method of preparing the pressure head and controlling the extrusion depth, and has good repeatability. However, the defect is that the formation mechanism of the damage characteristic is different from the damage characteristic generated in actual service, and the damage characteristic is greatly different. The pendulum bob method is used for preparing damage characteristics by converting potential energy into kinetic energy, specifically, the pendulum bob is triggered after being lifted to a certain height, and the simulation test piece is impacted by the falling pendulum bob to generate the damage characteristics. The method can simulate the formation mechanism of damage under the impact of foreign objects to a certain extent, and simultaneously better control the size and the shape of the damage, but has the defects that the impact effect is limited by the mass and the maximum height of the pendulum device, secondary damage is easily caused when the pendulum is sprung, and the preparation effect is interfered. The air cannon method prepares the damage signature by firing an elastomeric impact simulation test piece using compressed gas. The method can truly simulate the formation mechanism of damage under the impact of foreign objects, but has the defects of difficult control of the prepared damage characteristics, poor repeatability, high dispersity, difficult control of the preparation positions of the damage characteristics, complicated preparation device and high cost due to the fact that the speed and angle of an elastomer are controlled by adjusting the gas pressure of a high-pressure gas chamber. In view of this, the present disclosure aims to solve at least one of the following technical problems, including but not limited to, overcoming the problem that the formation mechanism of damage features is different from the damage features generated in actual service, having a large difference, overcoming the problem that the impact effect is limited by the quality and maximum height of the pendulum device, overcoming the problem of secondary damage caused by the bouncing of the pendulum, overcoming the problem that the size and shape of the prepared damage features are not easy to control, the problem of poor repeatability, overcoming the problem of large dispersibility, and overcoming the problem of complex and high cost of the preparation device. The purpose of this disclosure is to provide an adjustable foreign object impact damage preparation facilities. It is another object of the present disclosure to provide a preparation method for the preparation device. According to the external object impac