CN112985818A

CN112985818A - Method capable of quantitatively applying uniform circumferential radial force

Info

Publication number: CN112985818A
Application number: CN202110439468.0A
Authority: CN
Inventors: 孙清超; 郭钢毅; 袁志伟; 孙克鹏; 赵斌斌
Original assignee: Dalian University of Technology
Current assignee: Dalian University of Technology
Priority date: 2021-04-23
Filing date: 2021-04-23
Publication date: 2021-06-18

Abstract

The invention belongs to the technical field of mechanical test clamping, and provides a method for quantitatively applying uniform circumferential radial force. The inner edge of the upper flange test piece has a taper, the size of the taper is designed according to the demand, and its inner diameter is smaller than the inner diameter of the lower flange test piece, so as to realize the pairing of the upper wedge block and the lower wedge block. Compression of the upper flange specimen. The method of the invention only needs a simple fixture to realize the application of the circumferential radial force, and the test designer can independently design the cone angle of the upper flange test piece according to his own test requirements. And the application of quantitative uniform circumferential radial force can be realized through simple mechanical analysis.

Description

Method capable of quantitatively applying uniform circumferential radial force

Technical Field

The invention belongs to the technical field of mechanical test clamping, and relates to a method capable of quantitatively applying uniform circumferential radial force.

Background

In the service process of the aircraft engine, the rotor of the aircraft engine can be subjected to complex loads such as centrifugal load, thermal load, axial pneumatic load and the like, and finally the phenomenon of asynchronous radial slippage of two aircraft rotors connected through bolts is shown. The occurrence of this phenomenon seriously affects the service performance and the expected life of the aircraft engine, so it is necessary to perform relevant experimental research on this phenomenon and explore the formation process and mechanism of this asynchronous radial slip phenomenon. However, in a general principle test, it is difficult for the conventional jig to simulate the actual load of the rotor, and it is impossible to quantitatively apply a uniform circumferential radial force. Therefore, there is a need to develop a method for applying uniform circumferential radial force quantitatively facing a principle test.

Disclosure of Invention

The invention aims to solve the problems and invents a method capable of quantitatively applying uniform circumferential radial force.

The technical scheme of the invention is as follows:

a method for quantitatively applying uniform circumferential radial force comprises the steps that a device used in the method comprises an upper wedge block 1, a lower wedge block 2, a bolt 3, an upper flange test piece 4, a lower flange test piece 5 and a tension and compression test bed 6; the inner edge of the upper flange test piece 4 is processed with a taper, and the size of the taper is designed according to requirements; the upper wedge block 1 is pressed in from the upper surface of an upper flange test piece 4, the lower wedge block 2 is pressed in from the lower surface of a lower flange test piece 5, and the contact position of the upper wedge block 1 and the lower wedge block 2 is positioned in the upper flange test piece 4; the inner diameter of the upper flange test piece 4 is smaller than that of the lower flange test piece 5, so that the upper flange test piece 4 is compressed by the upper wedge block 1 and the lower wedge block 2;

the method comprises the following specific steps:

1) assembling an upper flange test piece 4 with taper at the inner edge and a lower flange test piece 5 without taper at the inner edge, which need to apply uniform pre-tightening force quantitatively, by bolts 3;

2) fixing the lower wedge-shaped block 2 on a tension-compression test bed 6, starting the tension-compression test bed 6, and setting pressing force of the tension-compression test bed 6 according to uniform circumferential radial force required by experimental design;

3) the upper wedge block 4 is compressed by the tension and compression test bed 6 according to a preset compression force, and the compression force acts on the radial direction through the taper of the inner edge of the upper flange test piece 5, so that the upper flange test piece 1 is subjected to quantitative and uniform circumferential radial force.

The invention has the beneficial effects that: the invention aims to provide a method capable of quantitatively applying uniform circumferential radial force. According to the method, the application of circumferential radial force can be realized only by a simple clamp, and a test designer can independently design the size of the cone angle of the upper flange test piece according to the self test requirement. And quantitative uniform circumferential radial force application can be realized through simple mechanical analysis.

Drawings

FIG. 1 is a schematic diagram of the implementation of the process.

FIG. 2 is a cross-sectional view of a test piece and a fixture for the method.

Fig. 3 is an isometric view from above of a test piece and a fixture for the method.

Fig. 4 is a bottom perspective view of a test piece and fixture of the method.

Fig. 5 is a force analysis diagram of the upper flange test piece 1 when the method is implemented.

In the figure: 1, an upper wedge block; 2, a wedge block is arranged; 3, bolts; 4, mounting a flange test piece; 5, a flange test piece; 6, pulling and pressing the test bed.

Detailed Description

The following further describes a specific embodiment of the present invention with reference to the drawings and technical solutions.

Firstly, a test designer designs the taper angle and the inner diameter of an upper flange test piece 4 according to test requirements, the inner diameter of a lower flange test piece 5 is larger than the inner diameter of the upper flange test piece 4, and the taper angle does not need to be designed, and then the upper flange test piece 4 is connected with the lower flange test piece 5 through a bolt 3; the lower wedge-shaped block 2 is placed on a tension-compression test bed 6, the assembled test piece is placed on the lower wedge-shaped block 2 along the central line, and the assembled test piece can be clamped tightly along the conical circumferential surface of the lower wedge-shaped block 2 due to the action of gravity; then starting the tension-compression test stand 6, and obtaining the circumferential radial force F to be applied according to the stress analysis chart shown in figure 5_xPressing force F applied with dynamic tension and compression test stand 6_yThe relationship between them is:

F_x＝F_y/tanθ

where θ is the designed taper angle magnitude.

Thus, only the required pressing force F needs to be calculated_yAnd operating the tension and compression test stand 6 to compress according to the pressing force, thus obtaining the required circumferential radial force F_x。

The method for quantitatively applying the uniform circumferential radial force is simple to operate and easy to implement, and a tester can set the size of the taper angle theta according to the test requirement of the tester, so that the uniform radial force can be automatically controlled.

Claims

1. A method that can quantitatively apply a uniform circumferential radial force, the device used in the method comprises an upper wedge block (1), a lower wedge block (2), a bolt (3), an upper flange test piece (4), a lower wedge Flange test piece (5) and tension and compression test bench (6); the inner edge of the upper flange test piece (4) is processed with a taper, and the size of the taper is designed according to requirements; the upper wedge block (1) is tested from the upper flange The upper surface of the test piece (4) is pressed in, the lower wedge block (2) is pressed in from the lower surface of the lower flange test piece (5), and the contact position of the upper wedge block (1) and the lower wedge block (2) is at the upper flange test The inner diameter of the upper flange test piece (4) is smaller than the inner diameter of the lower flange test piece (5), so that the upper wedge block (1) and the lower wedge block (2) can be connected to the upper flange test piece. 4 compression;

Specific steps are as follows:

1) Assemble the upper flange test piece (4) with a taper on the inner edge and the lower flange test piece (5) without a taper on the inner edge, which needs to be quantitatively applied with uniform pre-tightening force, by bolts (3);

2) Fix the lower wedge block (2) on the tension and compression test bench (6), start the tension and compression test bench (6), and set up the tension and compression test bench (6) according to the uniform circumferential radial force required by the experimental design the pressing force;

3) The upper wedge-shaped block (1) is compressed according to the pre-set compression force through the tension and compression test bench (6). This compression force will act through the taper of the inner edge of the upper flange test piece (4). to the radial direction, so that the upper flange test piece (4) is subjected to a quantitative and uniform circumferential radial force.