Cutting Tool Database System For Carbon Fiber Composite Materials

Carbon fiber composite materials have the advantages of high specific strength,large specific modulus,high impact resistance and small thermal expansion coefficient,it is widely used in key bearing components of manned space engineering,lunar exploration engineering and deep space exploration.However,carbon fiber composites have the disadvantages of nonuniformity,anisotropy and poor connection strength between layers.Defects,and serious tool wear,resulting in low processing efficiency,poor material surface quality,high production costs,once defects appear in the processing of large-sized parts,it may cause huge economic losses.Selecting appropriate tool and cutting parameters can reduce tool wear effectively,improve tool life,and achieve high-precision and high-quality cutting.The cutting mechanism,tool design and process parameters optimization for carbon fiber composite materials have been studied by scholars,but the systematic and effective cutting tool and process database system has been not formed to meet the actual production demand.The cutting tool database for carbon fiber composite materials was taken as research object.Taking the reasonable recommendation for cutting tools and process parameters as the main goal,the demand analysis and structural design for database system were carried out to determine the overall design scheme.The hybrid reasoning mechanism was established by combining expression method of process knowledge in rule reasoning and the creation mode of reasoning technology in case reasoning.In order to further enrich the calculation model of cutting tool database,the influence of process parameters on mill-grinding and milling results of carbon fiber composite materials was studied.The picosecond laser dressing system was built,and the electroplated diamond mill-grinding tool was modified by this system.The mill-grinding and milling contrast experiments with traditional milling tool were carried out,and the mill-grinding and milling performances before and after the modification were analyzed.The regression prediction model was established and applied to the database system calculation model library.Finally,the system development environment and development architecture were determined,and the overall development of carbon fiber composite cutting tool database system was completed.The carbon fiber composite materials cutting tool database system development process was clarified for the requirements of data pushing,model reasoning and user expansion.The paper analyzed the functional and data requirement,and designed multiple functional modules such as user login,data reasoning,information query and management,and user expansion.The structural design was carried out,and the overall E-R model was established.The E-R model was transformed into data model supported by the database management software,the two-dimensional data table contained 6000 data,such as tool,material,processing technology and case information.According to the data model,the corresponding basic database was established on the database management software,and the data query,call and maintenance were realized.Finally,the overall design scheme of the database system was determined.The reasoning mechanism of database system adopted the reasoning mechanism of combining rule and case reasoning.The type,quantity and characteristics of data information were determined by collecting process knowledge,and the case parameter model was established.The selection rules for cutting conditions were delimited,and constructed the knowledge model for process rules in the database system.According to the cutting manual,literature and experimental results,the calculation models of spindle speed,feed speed,cutting force,surface roughness and material removal rate were collected,it was stored in the system reasoning calculation model library.The example reasoning mechanism of the system was represented,retrieved,similarity calculation and weight division.Finally,the operation process of system hybrid reasoning is elaborated in detail.In order to study the influence of process parameters on the mill-grinding and milling results of carbon fiber composite materials,the grinding performance of picosecond laser dressing electroplated diamond mill-grinding tool was analyzed,and the regression model of cutting force and surface roughness was obtained.The dressing system of electroplated diamond mill-grinding tool was built,and the experiment of picosecond laser dressing the straight groove edge of electroplated diamond mill-grinding tool with slotted groove was carried out to obtain a neat sharp blade.The single factor experiments of mill-grinding and milling CFRP sheets were carried out,and the changes of cutting force,tool wear,surface defects and surface roughness of five mill-grinding tools or milling tools in the machining process were studied.The results show that due to the low cutting edge strength and sharpness of the ordinary milling tool,the cutting force and the surface roughness of the workpiece were large,the tool wear was the most serious,and the burrs on the surface of the workpiece were the most.The cutting force and workpiece surface roughness of diamond-tooth milling tool were the smallest,and the tool wear was the smallest.The cutting force and surface roughness of the machined workpieces of the three kinds of electroplated diamond mill-grinding tools were smaller than those of the ordinary mill-grinding tools and larger than those of the diamondtooth milling tool.Among them,the cutting force of the dressing electroplated diamond millgrinding was smaller,the wear and damage of the diamond grains arranged on the surface of the mill-grinding tool were less,and the surface quality of the machined workpiece was better,and the overall performance was close to that of the diamond-tooth milling tool.The electroplated diamond mill-grinding tool with improved structure and optimized process could be used as an ideal tool for milling carbon fiber composite materials.The Box-Behnken response surface experiments of grooved electroplated diamond mill-grinding,trimmed electroplated diamond mill-grinding and diamond-tooth milling tool were carried out,and the influence of the interaction of process parameters on the response value was analyzed.The fitting and regression analysis of the experimental results were carried out,and the quadratic polynomial regression model of cutting force and surface roughness was established.By testing the adequacy and visibility of the regression model,it was verified that the model had high credibility and simulation accuracy,and the regression model was applied to the computing model library in database system.On the basis of establishing the overall design and reasoning mechanism of database system,the development of system application program was completed.The database system adopted the WEB application program with B/S structure,which was developed under the IntelliJ IDEA software.HTML,CSS and JavaScript were used to design and write the WEB front-end interface.Java programming language implements backend server application.The data storage and management adopted the database management system Oracle-PLSQL Developer.Finally,the user login,data reasoning,information query and management,user customization and other functional modules of the database system were developed,which provided an efficient and practical database system of carbon fiber composite materials cutting tools for users.