Workpiece mass determination device, machining estimation device, and machining system

Abstract

This workpiece mass determination device (131) is for calculating a workpiece mass (M'w(Z')) for analysis for analyzing the dynamic characteristics during machining in a machining device (2) for machining a workpiece (W) by means of a tool (T), the workpiece mass determination device comprising: a first correspondence relationship storage unit (103b) which stores a mass correspondence relationship, which is a correspondence relationship between a machining state index (Z'), which changes according to the state of machining of the workpiece (W) by means of the tool (T), and the workpiece mass (M'w(Z')) for analysis; a machining state index acquisition unit (125) that acquires the machining state index (Z'); and a workpiece mass determination unit (122) that determines the workpiece mass (M'w(Z')) for analysis on the basis of the acquired machining state index (Z') and the mass correspondence relationship.