An online monitoring method and device for machine tool cutting chatter
A machine tool and flutter technology, which is applied in metal processing machinery parts, metal processing equipment, maintenance and safety accessories, etc. The effect of robustness
Active Publication Date: 2022-04-26
SHANGHAI JIAOTONG UNIV
View PDF0 Cites 0 Cited by
- Summary
- Abstract
- Description
- Claims
- Application Information
AI Technical Summary
Problems solved by technology
However, due to the influence of the environment, temperature, vibration, etc. during the actual machining process of the machine tool, the theoretical model is different from the actual model, and it is difficult to be widely used in practice.
Therefore, online monitoring and identification of chatter through sensor signals is a more effective method. At present, both at home and abroad are collecting processing signals that reflect the nature of cutting chatter, using signal processing algorithms for feature extraction, and selecting appropriate thresholds or classifications. On-line monitoring and identification of chatter by devices, these studies are limited to chatter identification under fixed parameters, and have limited effect in actual processing
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 moreImage
Smart Image Click on the blue labels to locate them in the text.
Smart ImageViewing Examples
Examples
Experimental program
Comparison scheme
Effect test
Embodiment Construction
[0055] The following is a detailed description of the embodiments of the present invention. This embodiment is implemented on the premise of the technical solution of the present invention, and detailed implementation methods and specific operating procedures are provided, but the protection scope of the present invention is not limited to the following implementation example.
[0056] Such as figure 1 Shown is a flow chart of an online monitoring method for cutting chatter of a machine tool according to an embodiment of the present invention.
[0057] Please refer to figure 1 , the online monitoring method of machine tool cutting chatter of the present embodiment comprises:
[0058] S11: Acceleration signals during milling are collected through an acceleration sensor installed on the spindle of the horizontal milling machine, expressed as x(t), where t represents time. The collected vibration signals include steady state signals, transition state signals and flutter state ...
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
Login to View More Abstract
The invention discloses an on-line monitoring method and device for machine tool cutting chatter. The method includes: collecting vibration signals during the cutting process of machine tools; performing fast Fourier transform on the vibration signals to determine where the maximum amplitude value in the frequency domain is located. Frequency range; perform wavelet packet decomposition on the vibration signal; select the frequency band containing the largest amplitude frequency to reconstruct the wavelet packet coefficient to obtain the vibration signal of the reconstructed characteristic frequency band; perform S transformation on the vibration signal of the reconstructed characteristic frequency band, and convert Singular value decomposition is performed on the obtained two-dimensional matrix, and the singular value entropy feature that characterizes the signal complexity is extracted, and the singular value entropy characteristic curve changing with time is drawn; through the singular value entropy characteristic curve, it is determined whether chatter occurs during the cutting process of the machine tool . Through the invention, batch production and flutter identification under variable cutting parameters can be realized, and the invention has good universality.
Description
technical field [0001] The invention relates to the technical field of machine tool processing, in particular to an online monitoring method and device for machine tool cutting chatter. Background technique [0002] High-speed milling is one of the main processing methods in key fields such as aviation, aerospace, vehicles, and ships. Processing stability has a major impact on improving product quality, production efficiency, and reducing production costs. Cutting chatter is a kind of vibration phenomenon spontaneously generated due to the self-excitation effect between the tool and the workpiece in metal processing. The generation of chatter has a destructive effect on the surface quality of the product and the wear of the tool. Damage to the machine tool spindle is a phenomenon that must be avoided in machining. At present, the main research direction is to establish a stability prediction model based on the dynamic characteristics of machine tools. However, due to the i...
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
Login to View More Patent Type & Authority Patents(China)
IPC IPC(8): B23Q7/00B23Q11/00
CPCB23Q7/00B23Q11/0032
Inventor 许黎明邢诺贝赵达刘福军周超
Owner SHANGHAI JIAOTONG UNIV