Study On Positioning Accuracy For Zero-position Automatic Centering Device Of Prismatic Axis And Hole Workpiece

Prismatic axis and hole workpiece are widely used in aerospace, shipping industry,military engineering, and other fields, because of its high transmission speed, gooddynamic performance, big bearing capacity, big transmission torque and smalltransmission vibration and noise. As a precision driving part, the machining processrequires a higher degree of accuracy. At present, prismatic hole workpiece are mostlyused drilling machine rough machining, and then grinding machine precision grindingmachining. In the prismatic axis and hole workpiece machining, the machine toolrealized the workpiece machining process of the flexibility of the automation under thecontrol of numerical system. And before the precision grinding machining, we mustfind the workpiece’s zero position first, but the traditional manual find will cause longauxiliary processing, low clamping efficiency, and workers skill level and good or badstate will influence clamping precision. In order to overcome the disadvantages ofmanual find, we have designed the zero-position deviation angle measurementautomatic find system based on the AT89C52SCM and absolute encoder instead oftraditional manual find, to completely realize the automation of workpiece’s find. Butthe before design of the automatic centering system exist that find speed is more slow,stability is bad, and measurement error is larger, so they don’t adapt the features ofnumerical control system processing’s high precision, high efficiency, high flexibilityand high automation.This paper through the research and improvement of the hardware and software onthe basis of the original design, to achieve rapid accurate on the processing zeropositioning and reduce angle measurement error, and improve the automatic finddevice’s precision and stability, so as to improve the axis and hole workpiece’smachining precision.This paper firstly overviews this topic’s research background and significance, thedeveloping situation of domestic and foreign research, and purpose and content of theresearch; summarizes the automatic find device’s working principle and system’sstructure; then according to the original design in the field work collected a batch ofvaluable data results, and according to the test results,we analyzed the possibleexistence shortcomings and defects of hardware and software in the work, and then forthese disadvantages and shortcomings, we drawing up relevant improvement and perfect measures about hardware and software sections. Hardware including:master-slave single-chip microcomputer’s lectotype design, angle measurementmodules’ optimization design, the perfection of human-computer interaction moduleand hardware anti-interference design. With the function of hardware, and modularstructure design, the software mainly includes the main program’s design andcommunication between the master-slave microcontroller, angle measurement, dataprocessing, and wireless communication module’s design and improvement, finally weresearched the software anti-interference technology.After the field experiment, testing and analysis of test results for the wholeimprovement device, we proved that the positioning accuracy for zero-positionautomatic centering device of prismatic axis and hole workpiece has been obviouslyincreased, system’s operation is stable and reliable, and every part of the device worksvery well, so the research has achieved the expected goal, and has a broad applicationprospect.