The invention discloses a method for online monitoring milling cutter defects. The method comprises the following steps that 1) a vibration sensor module is arranged on a machine tool spindle; 2) initial sample data is collected; 3) a threshold value delta S0, a time interval period T, a threshold value delta S1 are set; 4) vibration signals of n blades in the x, y, and z directions at each periodT0 are measured; 5) shaping is carried out to obtain n strong vibration cutting wave data formed by the n blades in the x, y, and z directions at each period T0 correspondingly; 6) the strong vibration cutting wave data is analyzed and processed to obtain difference values among cutting strong vibration wave areas formed by each blade at each period T0; and the like. According to the method for online monitoring the milling cutter defects, based on the precision requirement of a machined workpiece, rapid cutter defect monitoring, alarming and machine tool shutdown processing can be achieved through online vibration signal collection and analysis processing; the method is simple, the monitoring effect is obvious, the machining loss caused by cutter wear or defect can be remarkably reduced,and therefore the quality of the machined workpiece is improved.

Method for online monitoring milling cutter defects

The embodiment of the invention discloses a control method and a control device of an electromagnetic valve and a vehicle. The control method of the electromagnetic valve comprises the following steps: generating a pulse width modulation signal, wherein the frequency of the pulse width modulation signal is greater than the response frequency of the electromagnetic valve and the duty ratio of the pulse width modulation signal fluctuates periodically within a preset range so that the pulse width modulation signal is superposed with a flutter signal; and transmitting the pulse width modulation signal to the electromagnetic valve. The amplitude and the frequency of the flutter signal are respectively determined by modulating the periodic fluctuation of the duty ratio of the PWM signal in the preset range and the fluctuation range and the fluctuation period of the duty ratio of the PWM signal so that the independent adjustment of the amplitude and the frequency of the flutter signal is realized. The algorithm of the flutter signal is simplified on the basis of solving the problem of hysteresis of the electromagnetic valve due to static friction of the system or parasitic flutter of theelectromagnetic valve, and the amplitude and the frequency of the flutter signal can be better controlled according to the requirement of the hysteresis effect and thus the dynamic response characteristic of the electromagnetic valve can be better improved.

Control method and control device of electromagnetic valve and vehicle

The invention provides a milling flutter control method and system based on auxiliary superposition vibration. In the milling process, auxiliary superposition vibration is generated in the cutting feed direction of a main shaft-cutter so as to realize the control of milling processing flutter. The system comprises an actuating device arranged at the front end of a main shaft of a milling machine tool, a CNC system which is connected with the machine tool reads the rotating speed and the feeding speed of the main shaft and a controller for the number of teeth of the milling cutter, and a controller used for obtaining the maximum amplitude and frequency of the power according to the maximum value of the auxiliary superposition vibration and the periodical frequency of auxiliary superpositionvibration, and outputting a corresponding control voltage signal to control the actuating device. In the milling process, the actual working rotating speed condition and the cutting feed amount are considered. The method for applying the auxiliary superposition vibration in the feeding direction changes the stability domain boundary of the milling flutter, so that flutter is controlled.

Milling flutter control method and system based on auxiliary superposition vibration

The invention provides a method for optimizing the matching structural size of a main shaft and a knife handle of a machine tool The method includes the steps of 1, establishing a three-dimensional geometric model of a knife handle and a part of a main shaft structure matching with the knife handle, simplifying the geometric model; establishing a finite element analysis model of the knife handleand the main shaft structure; 2, carrying out static simulation analysis, analyzing the contact pressure intensity of the joint surface and the displacement deformation of the knife handle and the main shaft; 3, correcting the coordinate position of each node and the corresponding radial relative deformation amount; 4, calculating the actual matching amount between the conical surface of the knifehandle and the conical hole of the main shaft, and determining the matching type; calculating the difference value of the matching amount of the large end and the small end of the joint surface of main shaft and the knife handle; 5, analyzing the contact pressure on the joint surface, determining whether the main shaft and the knife handle are separated from each other or not on the large end ofthe joint surface; and 6, taking the diameter size of the knife handle at the k+1 position of the large end of the joint surface as an optimized result, so that reduction of the systematic rigidity and the inherent frequency of the main shaft and a cutter caused by a bellmouth is avoided

Method for optimizing matching structural size of main shaft and knife handle of machine tool

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Milling flutter control method and system based on auxiliary superposition vibration

Method for optimizing matching structural size of main shaft and knife handle of machine tool