Machining path coordination method for bilateral ultrasonic rolling of blade surfaces

Patent metadata

Field	Value
Publication number	US-11904423-B2
Application number	US-202017764136-A
Country	US
Kind code	B2
Filing date	May 20, 2020
Priority date	Sep 27, 2019
Publication date	Feb 20, 2024
Grant date	Feb 20, 2024

Abstract

Provided is a bilateral ultrasonic rolling processing track coordination method for a blade surface, the method comprising: step S 1 , performing layering processing on a blade to acquire a contour curve of “A”-shaped and “n”-shaped blade edges of a blade model at different heights; step S 2 : determining the endpoints of a blade processing track; and step S 3 : planning the thickness and the rotation angle of the blade, comprising: step S 31 , solving a main direction angle α main of the contour curve; step S 32 , solving the thickness d of the blade; step S 33 , solving a rotation angle required by blade processing when the blade edge is “A”-shaped; and step S 34 , solving the rotation angle required by blade processing when the blade edge is “n”-shaped. According to the method, blade deformation generated by an ultrasonic rolling force is reduced, the processing efficiency is improved, and the blade processing precision is also improved.

First claim

The invention claimed is:

1. A machining path coordination method for bilateral ultrasonic rolling of blade surfaces, comprising:
Step S 1 , layering a blade to obtain contour curves with shapes of “A” and “n” of blade edges at different heights of a blade model;
Step S 2 , determining endpoints of machining paths of the blade;
Step S 3 , planning blade thickness and rotation angle, which comprising:
Step S 31 , obtaining main direction angle α m of the contour curves;
Step S 32 , solving the blade thickness d;
Step S 33 , obtaining a rotation angle θ required for blade machining when the contour curve is in the shape of “A”,

θ
=

π
2

-

α
m

,

wherein α m is main direction angle of the contour curve;
Step S 34 , obtaining a rotation angle required for blade machining when the contour curve is in the shape of “n”; the step S 34 comprising:
Step S 341 , setting most area of blade body is set as a main direction segment, setting area adjacent front and rear edges as a vertical segment and setting area between the main direction segment and the vertical segment as a transition segment;
Step S 342 , calculation method of rotation angle for blade machining of the main direction segment is consistent with that of the step S 33 ;
Step S 343 , the rotation angle for the blade machining of the vertical segment is zero;
Step S 344 , taking two points P and Q from the transition segment, wherein the point P is an end point of the vertical segment and the point Q is a starting point of the main direction segment, if there are m machining points between points P and Q, the blade will rotate with an interval of angle

θ
d

=

(

π
2

-
β

)

/
m

,

wherein β is the main direction angle at the point Q.

2. The machining path coordination method for bilateral ultrasonic rolling of blade surfaces according to claim 1 , wherein the step S 1 comprising:
Step S 11 , determining direction of the machining paths as the direction of blade width;
Step S 12 , determining a machining area, setting a maximum value and a minimum value of height range of the blade required to be machined, and setting a layered starting point to be the minimum value;
Step S 13 , determining layered interception interval;
Step S 14 , intercepting the contour curve of the blade;
Step S 15 , judging whether current height reaches the maximum value of the blade height range, if it does not reach, an interception interval is added to continue intercepting the contour curves of the blade, if it reaches, performing the step S 2 .

3. The machining path coordination method for bilateral ultrasonic rolling of blade surfaces according to claim 1 , in the step S 2 , a radius comparison algorithm is adopted to determine the endpoints of the machining paths.

4. The machining path coordination method for bilateral ultrasonic rolling of blade surfaces according to claim 2 , in the step S 13 , the values of the layered interception interval are from 0.08 mm to 0.13 mm.

Assignees

• Univ East China Science & Tech

Inventors

• Zhang Xiancheng
• Zhang Kaiming
• Yao Shulei
• Liu Shuang
• Cheng Feng
• Tu Shantung

Classifications

• B23P9/02 Primary

  Treating or finishing by applying pressure, e.g. knurling (B23P9/04 takes precedence) · CPC title

• B23P9/04 Primary

  Treating or finishing by hammering or applying repeated pressure · CPC title

• G06F30/17

  Mechanical parametric or variational design · CPC title

• F01D5/286

  Particular treatment of blades, e.g. to increase durability or resistance against corrosion or erosion (F01D5/288 takes precedence) · CPC title

• F05D2230/26

  by rolling · CPC title