Aircraft engine rotor dynamic balance traction line drawing method

Abstract

The application discloses an aero-engine rotor dynamic balance traction line drawing method, and steps are as follows: step one, using three-dimensional software UG modeling, including rotor part model and dynamic balance test traction line two parts; step two, applying variable shaft profile milling mode or fixed shaft profile milling mode in the three-dimensional software UG processing function, driving mode selection curve / point, boundary or surface area, generating dynamic balance test traction line simulation tool path; the aero-engine rotor dynamic balance traction line drawing method makes full use of the modeling and processing functions of UG three-dimensional software, and combines the precision of the numerical control machining center, eliminates the precision deficiency risk caused by too much human intervention in the process of drawing the traction line, and achieves the purpose of accurately drawing the dynamic balance test traction line.

Description

Technical Field

[0001] This invention relates to the field of traction line drawing methods, and in particular provides a method for drawing dynamic balance traction lines for aero-engine rotors. Background Technology

[0002] In the engine design process of industries such as aviation and aerospace, in order to improve the stability of rotor components at high speeds and prevent excessive central inertia and deviation of the main shaft from its central axis of rotation during high-speed rotation, as well as the resulting damage to bearings and rotors, dynamic balancing tests must be performed on the rotor components before assembly. The success or failure of the dynamic balancing test is an important indicator for evaluating whether the rotor component is qualified.

[0003] The accuracy of the helical asymptote, the traction line in dynamic balancing tests, significantly impacts the success of the test. Current methods involve marking numerous points on the rotor component surface that coincide with the helical asymptote, then connecting these points according to the helix angle to complete the helical asymptote. However, this method involves excessive human intervention, potentially leading to insufficient accuracy and affecting the dynamic balancing results. This new method completely eliminates human intervention in drawing the helical asymptote, allowing a CNC machining center to accurately complete the drawing in one operation, thus removing all the aforementioned adverse factors.

[0004] There is an urgent need for a technically effective method for drawing dynamic balance traction lines for aero-engine rotors. Summary of the Invention

[0005] The purpose of this invention is to provide a method for drawing dynamic balancing traction lines for aero-engine rotors with excellent technical performance. It primarily addresses the problem that excessive human intervention can lead to errors in the accuracy of drawing the traction lines—helical asymptotes—for dynamic balancing tests on casing-type rotor parts.

[0006] The steps for drawing the dynamic balancing traction line of the aero-engine rotor are as follows:

[0007] Step 1: Use 3D software UG to create a model, including two parts: the rotor part model and the dynamic balancing test traction line, to accurately build the 3D model of the engine rotor.

[0008] Step 2: Apply the variable axis contour milling or fixed axis contour milling function in the 3D software UG, select curve / point, boundary or surface area as the drive mode, select a pointed tool, use circular infeed and retraction as the tool approach and retraction method, and generate a simulated toolpath for the dynamic balancing test traction line.

[0009] Step 3: Depending on the processing equipment, use the post-processing function of the 3D software UG to generate the CNC program for the dynamic balancing test traction line. The post-processing is a CNC program conversion software designed for special machining equipment and corresponding to UG software. It can convert the code generated by UG software into a program that can run on CNC equipment.

[0010] Step 4: Install the engine rotor onto the CNC machining center, use the angular holes on the rotor part to find the initial angular position of the rotor part, and set it to the zero-degree angular position.

[0011] Step 5: On the CNC machining center, replace the cutting tool with a scribing pen for scribing, and then use the pen tip as the tool setting point for tool setting.

[0012] Step six: Use a marking pen instead of a cutting tool to draw the traction line for the dynamic balancing test.

[0013] The proposed method for drawing dynamic balancing traction lines for aero-engine rotors fully utilizes the modeling and machining capabilities of UG 3D software and combines them with the precision of CNC machining centers. This eliminates the risk of insufficient precision caused by excessive human intervention during the drawing of traction lines, thereby achieving the goal of accurately drawing dynamic balancing test traction lines.

[0014] Advanced engines contain numerous rotor components, most of which require dynamic balancing tests. Therefore, it is necessary to draw dynamic balancing test traction lines. Existing methods are limited by excessive human intervention, potentially leading to insufficient accuracy. The proposed method for drawing dynamic balancing test traction lines for aero-engine rotors effectively improves the accuracy of these lines, i.e., the spiral asymptotes, while simultaneously increasing the success rate of dynamic balancing tests. It also avoids the error risks associated with manually drawing spiral asymptotes, completely eliminating human intervention and significantly improving drawing efficiency. Attached Figure Description

[0015] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments:

[0016] Figure 1 A schematic diagram of the dynamic balancing traction line for an aero-engine rotor;

[0017] Figure 2 This is a schematic diagram of the toolpath in UG simulation. Detailed Implementation

[0018] Example 1

[0019] Figure 1This is a schematic diagram of the traction line—a spiral asymptote—for the dynamic balancing test of a rotor part of a casing-type cap structure. The spiral asymptote is distributed on an irregular conical surface. The outer surface is a spline curve composed of approximately 25 points. The maximum diameter of the rotor part is approximately 460 mm, and the top is close to a cone shape. The angular alignment hole of the rotor part is located at the lower end of the outer surface of the rotor part. Figure 2 This is a schematic diagram of the toolpath and CNC program simulated using the modeling and machining functions of the 3D software UG.

[0020] The steps for drawing the dynamic balancing traction line of the aero-engine rotor are as follows:

[0021] Step 1: Use 3D software UG to create a model, including two parts: the rotor part model and the dynamic balancing test traction line, to accurately build the 3D model of the engine rotor.

[0022] Step 2: Apply the variable axis contour milling or fixed axis contour milling function in the 3D software UG, select curve / point, boundary or surface area as the drive mode, select a pointed tool, use circular infeed and retraction as the tool approach and retraction method, and generate a simulated toolpath for the dynamic balancing test traction line.

[0023] Step 3: Depending on the processing equipment, use the post-processing function of the 3D software UG to generate the CNC program for the dynamic balancing test traction line. The post-processing is a CNC program conversion software designed for special machining equipment and corresponding to UG software. It can convert the code generated by UG software into a program that can run on CNC equipment.

[0024] Step 4: Install the engine rotor onto the CNC machining center, use the angular holes on the rotor part to find the initial angular position of the rotor part, and set it to the zero-degree angular position.

[0025] Step 5: On the CNC machining center, replace the cutting tool with a scribing pen for scribing, and then use the pen tip as the tool setting point for tool setting.

[0026] Step six: Use a marking pen instead of a cutting tool to draw the traction line for the dynamic balancing test.

Claims

1. An aircraft engine rotor dynamic balance towline mapping method, characterized by: The aero-engine rotor dynamic balance traction line drawing method steps as follows: Step one, using three-dimensional software UG modeling, including rotor parts model and dynamic balance test traction line two parts; Step two, application three-dimensional software UG processing function in the variable shaft profile milling method or fixed shaft profile milling method, drive mode selection curve / point, boundary or surface area, tool selection sharp knife, feed forward knife way with circular arc feed forward knife, cutting depth is 0.01~0.5mm, generate dynamic balance test traction line simulation tool path; Step three, according to the different processing equipment, using three-dimensional software UG post-processing function will be dynamic balance test traction line CNC program generated; Step four, engine rotor parts, installed to the numerical control machining center, using the rotor parts on the angle hole to find the initial angle position of the rotor parts, and set to the angle zero position; Step five, in the numerical control machining center will be replaced with line special line pen, then with the pen as the tool setting point tool setting; Step six, with line pen instead of tool, dynamic balance test traction line drawing.

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