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Device and method for monitoring center of mass displacement of parts under temperature changing conditions

A temperature change and displacement monitoring technology, which is applied in the direction of measuring devices, machine/structural component testing, static/dynamic balance testing, etc., can solve the problem of not being able to measure in real time, the three-coordinate measuring machine is bulky, and the temperature load cannot be applied to the measuring piece And other issues

Active Publication Date: 2019-11-29
BEIJING INSTITUTE OF TECHNOLOGYGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The above-mentioned measurement method has the following disadvantages: the three-coordinate measuring machine is bulky, and the measurement piece must be placed on its exclusive measurement platform for measurement, and the temperature load cannot be applied to the measurement piece, and real-time measurement cannot be performed; the digital image recognition method is limited by the image processing algorithm. and the effects of the optical diffraction limit

Method used

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  • Device and method for monitoring center of mass displacement of parts under temperature changing conditions
  • Device and method for monitoring center of mass displacement of parts under temperature changing conditions
  • Device and method for monitoring center of mass displacement of parts under temperature changing conditions

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Experimental program
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Embodiment 1

[0031] This embodiment provides a centroid displacement monitoring device for precision parts under temperature changing conditions, see the attached figure 1 and 2 , including: a base plate 2, a frame 5, a gasket, two displacement sensors 1 and two pressure plates 7; the shaft part to be measured in this embodiment is the motor shaft 6;

[0032] The displacement sensor 1 adopts a non-contact displacement sensor;

[0033] See attached Figure 4 , the frame 5 is a U-shaped frame, and the upper and lower surfaces of the horizontal part are respectively provided with two semi-arc-shaped gaps at the relative positions in the middle of the upper and lower surfaces. The two semi-circular-shaped gaps are used to make the frame 5 prone to slight deformation; The upper end surfaces of the two vertical parts are respectively provided with semi-arc-shaped grooves for installing the motor shaft 6;

[0034] See attached Figure 5 , the motor shaft 6 is a cylindrical structure;

[0035...

Embodiment 2

[0039] This embodiment provides a method for monitoring the displacement of the center of mass of precision parts under the condition of temperature change based on the device in Embodiment 1. The steps of the method are as follows:

[0040] In the first step, the device in Embodiment 1 is assembled, wherein the pretightening force of the motor shaft fastening screws 3 at both ends of the motor shaft 6 is controlled by a torque wrench to be 400N, that is, the loading state is a load of 400N;

[0041] In the second step, place the device in the first step in a constant temperature and humidity test chamber;

[0042] The third step is to make the temperature in the constant temperature and humidity test chamber change according to the way of 0°C-40°C-0°C (that is, the process of gradually increasing from 0°C to 40°C and then gradually decreasing to 0°C), and through the The real-time data of the two displacement sensors 1 are recorded by the computer electrically connected to th...

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Abstract

The invention discloses a center of mass displacement monitoring device and method of a component in a temperature change condition, and belongs to the technical field of manufacturing quality prediction and control. The device comprises a base plate, a frame, a gasket, two displacement sensors and two pressure plates, a horizontal portion of the frame is arranged at the middle part of the base plate, two ends of a shaft component are respectively arranged in semicircular arc grooves of upper end surfaces of two vertical portions of the frame, semicircular arc grooves of the two pressure plates are respectively arranged at two ends of the shaft component, the gasket is arranged between a bottom surface of the end at which one vertical portion of the frame is located and the base plate, andthe two displacement sensors are respectively arranged at two ends of the base plate and located at two sides of the frame. According to the device and method, the displacement of the center of massof the shaft component, changing with the temperature, in the condition of loading a load can be monitored in real time.

Description

technical field [0001] The invention belongs to the technical field of manufacturing quality prediction and control, and in particular relates to a centroid displacement monitoring device and method of a part under temperature changing conditions. Background technique [0002] For high-precision parts, the position of the center of mass of the part may change with time, load and temperature after assembly, and this change will have a very important impact on high-precision parts, such as the center of mass of the gyro flywheel in the gyro instrument The stability of the gyro flywheel is very important. Generally, it is required to be within the sub-micron level. The high-precision gyro instruments used for navigation have stricter requirements on the stability of the center of mass of the gyro flywheel. It is hoped that it will be within tens of nanometers. From this point of view , it is very important to monitor the displacement change of the center of mass of precision pa...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01M1/12
CPCG01M1/122
Inventor 张之敬金鑫张敏陈骁王子夫马兆利
Owner BEIJING INSTITUTE OF TECHNOLOGYGY