Build up edge monitoring method

A build up edge monitoring method, used for monitoring a cutting machine, comprising the steps of:

• capturing a cutting vibration acceleration signal;
• filtering the cutting vibration acceleration signal with a frequency exceeding 1.1 times of a blade passing frequency, and the blade passing frequency being determined by a main shaft rotating speed S and a number of cutters N;
• comparing the cutting vibration acceleration signals of three consecutive predetermined time periods, and analyzing a maximum value and an average value of the cutting vibration acceleration signal of each predetermined time period, wherein the three consecutive predetermined time periods are a first predetermined time period, a second predetermined time period and a third predetermined time period;
• calculating a maximum value of the cutting vibration acceleration signal in the second predetermined time period and an average value of the cutting vibration acceleration signal in the first predetermined time period;
• comparing the maximum value of the cutting vibration acceleration signal in the second predetermined time period with the cutting vibration acceleration signal in the first predetermined time period to check whether a difference thereof is two times;
• performing a fast Fourier transform of the cutting vibration acceleration signal of the third predetermined time period to solve a main vibration frequency of the cutting vibration acceleration signal;
• solving a blade passing frequency of a build up edge, wherein the blade passing frequency of the build up edge is equal to the blade passing frequency
• ×
• (
• N
• -
• A
• )
• N
• ,
• wherein A is the number of built-up edged cutters, N is the number of cutters;
• and
• determining whether the main vibration frequency of the cutting vibration acceleration signal matches a blade passing frequency of the build up edge;
• shutting down the cutting machine, when the difference between the maximum values of the cutting vibration acceleration signal in the second predetermined time period and the cutting vibration acceleration signal in the first predetermined time period is two times, and the main vibration frequency matches the blade passing frequency of the build up edge.