Research On The Application Of Digital Boring Technology For Ship Stern Tub

The boring of the stern tube of large ships is often carried out in the dock,and the machining accuracy of the stern tube boring is related to the quality of the boring process.Although China’s shipyards have made some good progress in the machining accuracy of boring holes,the machining process,error measurement,and compensation stages of stern tube boring still rely heavily on workers.The existing stern tube boring equipment in shipyards is relatively backward compared to foreign countries,and there is a certain gap in digitalization and automation compared to foreign countries.In the face of the high-precision requirements of modern shipbuilding,it appears to be a bit stretched.At the same time,the efficiency of boring processing affects the length of time the ship is in dock,and indirectly affects the time the ship is undocked.Therefore,how to improve the machining efficiency of stern tube boring while ensuring the machining accuracy of stern tube boring is a challenge for major shipyards in China and a challenge that must be overcome by digital shipbuilding in China.In response to the efficiency and accuracy issues in the current boring process of the stern shaft tube,this article studies the boring process,digitizes the boring equipment of the stern shaft tube,and proposes digital error measurement models and real-time machining compensation models.Ensuring the machining accuracy of the stern tube boring while improving the machining efficiency of the stern tube boring has achieved digital transformation and automated processing of the stern tube boring,while promoting shipyards’ approach to digital shipbuilding.In order to ensure the machining accuracy of stern tube boring while improving the efficiency of stern tube boring,this article will conduct specific research on the following aspects:(1)Analyze and study the machining process of stern tube boring,use Solidworks to establish an equipment model for stern tube boring,and use ANSYS finite element to analyze the thermal factors and static stress factors such as deflection of the boring bar model.The influencing factors that cause shape and position errors in stern tube boring are obtained.The error prediction model constructed in the following text can design input and output parameters based on these factors.Evaluate the shape and position error of the stern tube for comparison with the error values measured in the following text;(2)Set the input parameters of the model based on the factors causing shape and position errors,establish an error prediction model based on BP neural network to obtain the output parameters,use D-S evidence theory and Kalman filtering to fuse and analyze the data,and display the processing position,deviation,and adjusted data in real-time on the interface.Provide reasonable control strategies,and train the error prediction model using commonly used data from previous processing,Verify the reliability of the error prediction model,achieve the function of predicting the error of the stern tube boring hole,and provide data support for subsequent adjustment of the corresponding mechanical parts by the microcontroller for processing compensation;(3)Based on the research on the evaluation and online measurement of stern tube error,a digital measurement system for stern tube error is developed based on VC++.After the boring process is completed,the size data of the stern tube is automatically measured,and the shape and position error value of the stern tube is calculated and measured in combination with the previous evaluation of the shape and position error of the stern tube;(4)The development of a processing compensation system using PLC for the processing equipment of stern shaft tube boring is carried out.The corresponding control core and motor are designed,calculated,and selected.The microcontroller sends out adjustments to the corresponding mechanical parts for processing compensation,ensuring that the boring accuracy of the ship’s stern shaft tube boring meets the requirements,improving the processing quality,and achieving digital boring of the stern shaft tube.