Judgment method for crucial moments in full process of cutting working procedure of numerical control machine tool

Abstract

The invention provides a judgment method for four crucial moments in a full process (a working feed starting moment, empty feeding, a cutting starting moment, cutting, a cutting ending moment, empty feeding and a working feed ending moment) of cutting working procedure of a numerical control machine tool. The method comprises the following steps of judging the working feed starting moment and the working feed ending moment according to a real-time execution state of a numerical control processing code; judging the cutting starting moment and the cutting ending moment by comparing input power of a machine tool spindle with empty feeding power in real time; to a special cutting working procedure with unremarkable power change in the working feed process, the cutting starting moment and the cutting ending moment are judged by combining a historical statistical average value of empty feeding duration with a working feed time point. Based on the judgment of the four time points, cutting duration and two empty feeding durations in the working procedure of cutting can be obtained, thereby effectively solving the difficult problem that cutting time of the numerical control machine tool and an effective utilization rate of the machine tool are difficult to accurately acquire.

Description

technical field [0001] The invention relates to the technical field of numerical control machine tools, in particular to a method for judging critical moments in the whole process of cutting steps of a numerical control machine tool. Background technique [0002] The whole process of machine tool cutting step is composed of the starting time of working feed--dry cutting-cutting start time-cutting-cutting end time-dry cutting-working feeding end time, among which, the cutting process refers to the machine tool The tool makes contact with the workpiece and initiates the material removal process. The online automatic judgment of the cutting process is the core of obtaining the key operating parameters of the machine tool such as the effective running time of the machine tool (cutting time) and the effective utilization rate of the machine tool (cutting time / start-up time); secondly, the wear of the tool, the consumption of cutting energy, the coolant Consumption, etc., all occ...

AI Technical Summary

Problems solved by technology

However, in addition to the cutting time, the feed time of the machine tool also includes the idle cutting time. As the service time of the machine tool increases, the empty cutting time will increase, and the cutting time error of the machine tool produced by this method will also increase. bigger

[0004] Some research has been done on the cutting process of machine tools in the world: the Chinese patent with the publication number CN103838181A judges the working process of the machine tool according to the change characteristics of the current signal when the machine tool spindle is loaded. Uncontrollable random fluctuations make it difficult to judge the cutting start and end moments of this type of machining; the US patent (US 20140212236A1) judges the cutting process of CNC machine tools by installing multiple sensors at the tool and spindle, but at the spindle of the machine tool The cost of installing sensors is high, and it may even affect the normal operation of the machine tool; the Canadian patent (CA 2063887) realizes the tool path monitoring during the cutting process of the machine tool by using multi-displacement monitoring equipment, but it cannot directly determine the exact moment when the tool contacts the workpiece; The Chinese patent with the publication number CN104808584A realizes the online monitoring of the utilization status of the machine tool equipment by using the characteristics of machine tool power changes and the human-computer interaction method, but the transparency of the cutting fluid and the safety door of the machine tool will affect the accuracy of manual visual judgment and reduce the monitoring accuracy

[0005] To sum up, the existing machine tool cutting process judgment technology mainly has problems such as high instrument cost and inconvenient installation, low judgment accuracy of partial finishing cutting process, and difficult judgment of empty cutting tools.

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