Reliability test method of tool magazine manipulator in machining center based on field load characteristics

Abstract

The invention discloses a machining center knife magazine manipulator reliability testing method based on an onsite load characteristic. The method comprises the three steps of onsite data acquisition, a data processing process and laboratory reliability testing. The data processing process comprises the following six steps of calculation of average knife switching frequency alpha of a knife magazine manipulator and an average fault interval knife switching frequency MTBFn in an actual condition, establishment of a statistical distribution model of a cutterhead / cutter chamber insertion total weight Mi, determination of an average knife insertion number V(Zj) during each weight grade reliability test of a cutterhead / cutter chamber, establishment of a knife insertion distribution model of the cutterhead / cutter chamber at each weight grade, calculation of parameters of counterweight blocks selected for the tests and calculation of the knife switching frequency of each counterweight block during the tests. Through performing a laboratory reliability test on the machining center knife magazine manipulator by use of the method, the method can effectively shorten the assessment period of the knife magazine manipulator and improve the assessment precision.

Description

technical field [0001] The invention relates to a laboratory reliability test method for evaluating the reliability level of a tool magazine manipulator of a machining center, more precisely, the invention relates to a reliability test method of a tool magazine manipulator of a machining center based on field load characteristics. Background technique [0002] With the continuous improvement of the level of my country's machinery industry, domestic machining centers are more and more widely used in industries such as automobiles, aerospace, and precision molds. However, with the increase of the functions of the machining center and the improvement of the performance index, the hidden dangers of its failures have gradually increased, and the reliability problem has become more and more serious, which has become an important factor restricting the domestic machining center from occupying the market. Statistical analysis of a large number of fault data shows that one of the mai...

AI Technical Summary

Problems solved by technology

The current test method is mainly based on the ex-factory performance index requirements of the tested tool magazine, and conducts a simple tool change test of maximum tool weight, maximum tool length, and maximum eccentric moment. Even if a random tool change test is performed within a certain period of time, the test will The characteristic information necessary for the reliability test, such as the load of the cutter head (number and weight of inserting tools), tool selection, test time (total number of tool changes), etc., is not considered. The test process is more inclined to the performance test of the tool magazine manipulator, while It cannot be called a reliability test, so the failure data generated by the test often cannot be used for reliability evaluation

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