Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

Cutting chatter online monitoring method and monitoring system

A technology of monitoring system and numerical control system, applied in the field of mechanical processing, can solve the problems of obtaining process system, aggravation, chatter, etc., and achieve the effect of simple calculation process

Inactive Publication Date: 2019-07-09
CHENGDU AIRCRAFT INDUSTRY GROUP
View PDF11 Cites 5 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Using the hammering method to obtain the stable domain of chatter can avoid the occurrence of chatter to a certain extent, but the cutting state is not only related to the spindle, but also related to the state of the tool and the workpiece. In actual production, it is difficult to completely obtain The state of the entire process system, and as the processing progresses, the residual material gradually decreases, the state of the parts is constantly changing, the stiffness of the workpiece shows a time-varying decrease trend, the dynamic characteristics of the tool-workpiece system deteriorate and lead to the intensification of chatter

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Cutting chatter online monitoring method and monitoring system
  • Cutting chatter online monitoring method and monitoring system
  • Cutting chatter online monitoring method and monitoring system

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Such as figure 1 As shown, a cutting chatter online monitoring method is characterized in that: comprising the following steps:

[0031] a. Install the vibration sensor on the spindle of the machine tool, read the sensor data, and at the same time automatically read the spindle speed m in the CNC system, and calculate the spindle passing rate f s =m / 60;

[0032] b. If the amount of sensor data read is greater than or equal to N, then Fourier transform and clear the data; if the amount of data is less than N, return to the read sensor data in step a, where N is the set amount of data;

[0033] c. The law between the frequency domain signal and the cutting state is: during stable cutting (no flutter generation), the vibration energy is concentrated in the spindle passing rate f s Integer multiples of frequency; when flutter occurs, the vibration energy deviates from the main axis through the rate f s Integer multiples of frequencies, there will be larger vibrations at ...

Embodiment 2

[0045] Such as figure 1 As shown, a cutting chatter online monitoring method, including the following steps:

[0046]a. Install the vibration sensor on the spindle of the machine tool, read the sensor data, and at the same time automatically read the spindle speed m in the CNC system, and calculate the spindle passing rate f s =m / 60;

[0047] b. If the amount of sensor data read is greater than or equal to N, then Fourier transform and clear the data; if the amount of data is less than N, return to the read sensor data in step a, where N is the set amount of data;

[0048] c. The law between the frequency domain signal and the cutting state is: during stable cutting (no flutter generation), the vibration energy is concentrated in the spindle passing rate f s Integer multiples of frequency; when flutter occurs, the vibration energy deviates from the main axis through the rate f s Integer multiples of frequencies, there will be larger vibrations at many other frequencies;

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

The invention discloses a cutting chatter online monitoring method and a monitoring system. The monitoring method comprises the following steps: a, reading sensor data, computing a main axis passing rate fs=m / 60; b, if the sensor data size is greater than or equal to N, performing Fourier transform and cleaning data, and returning to step a if the data size is less than N; c, when the chatter occurs, enabling the vibration energy to deviated from the integer multiple frequency of the main axis passing rate fs; d, computing a formula as shown in description; e, comparing the f0 with f; f, whenthe f0 is less than f, returning to step b, and ending; g, when the f0 is not less than f, sending a PLC signal to control a machine tool to halt; and h, ending. The monitoring system comprises the vibration sensor, a vibration signal collection card, a computer, an industrial bus interface and a numerical control system PLC. The Fourier transform is performed on a vibration signal so as to transform the vibration signal to a frequency domain, whether the chatter occurs is judged according to the deviation degree between the frequency located by the main vibration energy and the integral multiple frequency of the main axis passing rate, and the monitoring is performed at the same time.

Description

technical field [0001] The invention belongs to the technical field of mechanical processing, and in particular relates to an online monitoring method and monitoring system for cutting chatter. Background technique [0002] During the cutting process, when the cutting parameters do not match the rigidity of the process system, the phenomenon of cutting chatter is prone to occur, which is mainly manifested in the aggravation of vibration and sound, making the cutting process unstable, resulting in the decline of the surface quality of the parts, and even causing tool damage. More serious part quality problems or / and equipment accidents. Historically, cutting chatter has been monitored manually by operators based on experience. However, in recent years, CNC machining has gradually developed towards automation and without manual intervention. How to monitor cutting chatter to ensure the quality of parts and the safety of equipment is a problem that must be solved. [0003] In...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
IPC IPC(8): G05B19/4065G05B19/414
CPCG05B19/4065G05B19/414G05B2219/34291G05B2219/45136
Inventor 朱绍维牟文平宋戈孙超马飞
Owner CHENGDU AIRCRAFT INDUSTRY GROUP
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com