Precision Horizontal Machining Center’s Integrated Dynamic Precision Design And Application

Along with the continuous development of our country‘s automobile, aerospace,military weapons and equipment and shipbuilding industry, the demand for highprecision NC machine tools grow rapidly, machine tool integrated dynamic accuracymodeling technology, is the root of the precision machine tool‘s real-time errorcompensation to achieve high machining accuracy, and is also the key technology forour mechanical designers need to improve constantly. Based on the multi-bodysystem theory, take precision horizontal machining center μ2000as the researchobject, on the basis of building machine tool geometric error model and the thermalerror model confirmed the integrated dynamic precision of the machine tool model.And put forward the identification method to the key error source parameter ofmachine tool based on sensitivity analysis, and studied the identification method ofkey thermal error source in different temperature range.Firstly, summarize the background and research significance of this topic,analyze the current research and development situation of the machine tools precisionmodeling technology fields, summarized the main content of this article.Secondly, put forward and discussed some new methods aiming at the problemto be solved in the direction of machine tool integrated dynamic precision modelingand take to machine key error source parameter identification as development.Specific content as follows:(1)Using multi-body theory, according to machine tool‘s structure and movementcharacteristics, abstract machine tool into a multi-body system, derive machine tool‘two adjacent bodies‘characteristics matrix and the equation of motion, duringmodeling process the geometric error and thermal error are considered. And thenestablished machine tool‘s geometric error model and comprehensive error model,introduced geometric error measurement system and the principle. Introduced the API6dXD-double-frequency laser interferometer‘measurement system and usingprinciple for precision horizontal machining centerμ2000, did the groundwork forpredict machine tool machining‘error accurately.(2)Discussed and determined the spindle temperature field and the testingmethods of thermal error, set up a experimental platform for the spindle, studiedtemperature sensor and displacement sensor layout scheme according to the measurement point after optimal selection. Build the spindle’s temperature field andthe thermal error of real-time detection system concretely finally, and did specificinstructions to thermal error of spindle and temperature field test software system.;(3) Put forward machine tool‘thermal error modeling theory and method, selectthe shaft key temperature measurement point by citing the fuzzy clustering analysismethod and the temperature variables grouping optimization method, and then testedthe key parameters of thermal error of spindle unit with five point measurementidentification method. Establish thermal error model between the temperature fieldand thermal error with multiple linear regression method, established the spindlethermal error model, and then improved the comprehensive dynamic error model.(4)Proposed the machine tools critical error source parameter‘s identificationmethod based on sensitivity analysis, product the sensitivity analysis to the geometricerror and thermal error parameters of NC machine tools, and identified the errorparameters that had greater influence on the machining accuracy of nc machine tools.Studied identification method to the key thermal error source of spindle unit indifferent temperature range, identify the thermal error terms that had greater influenceon the machining accuracy of nc machine tools in different temperature range;Finally, summarize the full text and points out the following direction that needto study.