FRACTURE PREDICTING DEVICE FOR TOOL

摘要

PURPOSE:To prevent damage of machining material and to improve the economy by deciding the fracture of tool from the number of outbreak component in AE signal to be produced from a working tool thereby enabling replacement of tool immediately before fracture. CONSTITUTION:AE conversion chip provided in AE sensor 6 mounted on the table 4 of machining center 1 will convert AE wave from a drill 3 into AE signal. Here, AE signal as a measuring signal includes single outbreak component and complex outbreak component where plural outbreak components are overlapped. Single outbreak component is processed into a pulse signal of same magnitude with Y1 or the maximum output level of outbreak component through processing circuit 7 while the first outbreak component having the maximum output level of Y2 is processed similarly with the single outbreak component and the second outbreak component having the maximum output level of Y4 is processed into a pulse signal having the output level of Y4-Y3. The number of said AE processed signal is counted and compared with the referential level to decide fracture of tool upon exceeding over the referential level.