Machining time prediction device

A machining time prediction device predicting a time taken for machining by a wire discharge machining device based on a program, comprising:

• a processor;
• a memory for storing the program;
• a display device;
• and
• a predicted machining speed table where predicted machining speeds are registered in association with a plurality of shape groups used for classification based on at least a shape of a machining path,
• wherein the processor is configured to
• execute a machining path generation process for generating machining path data including the machining path based on the program,
• execute a shape group determination process for determining which shape groups among the plurality of shape groups partial machining paths included in the machining paths of the machining path data generated by the machining path generation process belong to,
• execute a path length addition process for adding and summarizing path lengths of the partial machining paths for the respective shape groups on the basis of a result of determination by the shape group determination process for,
• execute a predicted machining time calculation process for calculating predicted machining times of the respective shape groups on the basis of the predicted machining speed table and the path lengths of the respective shape groups summarized by the path length addition process,
• execute a predicted machining time summation process for calculating the predicted machining time of the machining path by summing the predicted machining times of the respective shape groups calculated by the predicted machining time calculation process, and
• a display process for displaying, on the display device, the predicted machining time of the machining path calculated by the predicted machining time summation process, so that a workpiece, which has been machined by the wire discharge machining device along the machining path based on the program, is removed from the wire discharge machining device at the end of the predicted machining time.