A method of monitoring grinding wheel wear and grinding burn by using grinding force
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A technology for grinding burns and grinding forces, which is applied to the parts of grinding machine tools, grinding/polishing equipment, grinding/polishing safety devices, etc., can solve the problems of small application, and achieve the promotion of development, intelligence and The effect of automation and the avoidance of grinding burn
Inactive Publication Date: 2018-11-02
ACADEMY OF ARMORED FORCES ENG PLA
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However, the detection of grinding force is mainly used for basic experimental research for the time being, and the applicability quantitative relationship with the degree of grinding wheel wear and grinding burn is rarely established, so it is very rarely used in actual production.
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Embodiment 1
[0054] Taking the monitoring process of microcrystalline corundum grinding wheel form grinding 20CrMnTi steel gear by using the time domain signal characteristics of grinding force as an example, the execution process is shown in the attached figure 1 As shown, it includes the following steps:
[0055] The first step: collect the discrete time series of the grinding force signal in the grinding process in real time, and obtain the grinding force signal sample set X.
[0056] (1) Clear and calibrate the dynamometer sensor in advance, so that the zero drift M is less than 2, and set the acquisition frequency of the dynamometer sensor to 1000 Hz.
[0057] (2) Use the dynamometer sensor to collect real-time data on the change of grinding force over time during the form grinding process of 20CrMnTi steel gears.
[0058] The dynamometer sensor can use the Swiss KISTLER brand 94272 model.
[0059] figure 2 In order to change the grinding force in the whole grinding process, it di...
Embodiment 2
[0081] Taking the monitoring process of microcrystalline corundum grinding wheel form grinding 20CrMnTi steel gear as an example by using the frequency domain signal characteristics of grinding force, the execution process is shown in the attached image 3 As shown, it includes the following steps:
[0082] The first step: the same as the first step in Embodiment 1, and will not be repeated here.
[0083] The second step: extract the frequency domain characteristic value of the grinding force signal from the grinding force signal sample set X obtained in the first step, and the frequency domain characteristics include: the kurtosis Xq of the amplitude spectrum waveform, the pulse index I, and the cumulative probability distribution function PF(k), and the spectral centroid Fmid of the power spectrum.
[0084](1) Perform discrete Fourier transform analysis on the discrete time series X of grinding force to obtain the amplitude spectrum and power spectrum. Among them, the ampl...
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Abstract
The invention discloses a method for monitoring grinding wheel wear and grinding burn by using a grinding force, and belongs to the technical field of monitor and control of machining processes. The method comprises the following steps of acquiring discrete-time series of a grinding force signal in real time, extracting important characteristic parameters, such as kurtosis, waveform index, pulse index, amplitude-frequency spectrum kurtosis, amplitude-frequency spectrum pulse index, and amplitude-frequency spectrum cumulative probability, of the grinding force signal through time-domain or frequency-domain analysis, identifying different wear degrees of a grinding wheel, and overhauling the blunt grinding wheel in time; during a steady-state grinding stage, extracting an average amplitude of a tangential grinding force or a frequency spectrum centroid of a power spectrum in real time, and controlling the grinding burn. According to the method provided by the invention, the grinding force online monitoring and real-time signal processing are combined, so that the intelligent monitoring and controlling on grinding wheel-workpiece grinding contact status, grinding wheel wear condition, grinding burn and the like in a whole grinding processing process can be realized; the method for monitoring the grinding wheel wear and grinding burn by using the grinding force has various advantages that the antijamming capability is high, the operation is simple, the programming realization is convenient, the intellectualization is realized and the like.
Description
technical field [0001] The invention belongs to the technical field of monitoring and control of mechanical processing, and in particular relates to a new method for online real-time monitoring of grinding wheel wear and grinding burn based on feature extraction of grinding force signals. Background technique [0002] Grinding process monitoring is an important branch of mechanical processing process monitoring, and it is a key component of hot topics such as realizing intelligentization and automation of grinding process and ensuring manufacturing quality. At present, the machining process monitoring technology uses sensors, instruments and other measurement methods to detect vibration, power, temperature, grinding specific energy, force, machining sparks, acoustic emission and other related information in the machining process in real time. Usually, sensor perception technology, signal processing technology, artificial neural network and other achievements are fused, and s...
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