The Structure Design Of Embedding Tool Holder And The Research On Its Dynamic Characteristics Analysis

With the development of fast feed speed on numerical control machine tool andmanufacture center, the large amount of cutting heat which generated in the high speedmilling cutting process, have a fatigued impact on the flat end mill, aggravate the wear andbreakage invalidation of the tool and affect the machining precision. In order to measurethe cutting temperature of end mills, the tool holder structure is improved by embeddingelectronic temperature measure devices into the tool holder. The electronic temperaturemeasure device will rotate together with the tool holder. The temperature data will betransmitted wirelessly and displayed on the PC in real time. This improved tool holderstructure will achieve a real-time, direct and successive cutting edge temperaturemeasurement in the high speed cutting. These results will provide more substantialexperiment data for the wear and breakage research of the cutting tools.In this thesis, we concentrate on the research of the BT40tool holder and the HSK-A63tool holder which are widely applied in the high-speed machining tool system, carry outthe relevant theoretical research, simulation and experiments of the tooling system in thestructural design of the non-standard tool holder with thermocouple temperaturemeasurement. Regarding this, this paper content explicitly as follows:The speed range of the existing tool holders are being considered, this paper selectsBT40tool holder and HSK-A63tool holder as the research objects. The structures andproperties of these two tool holders are described. According to the plastic mechanicstheory, a theoretical analysis model for the spindle of the high speed machining and toolholder is built. According to the taper shank structure of national and internationalstandards and the request of data acquisition module, the non-standard tool holder withthermocouple temperature measurement is designed. The structural design of toolingsystem is completed on the basis of continual improvement and optimization of the toolholder.Based on the structural design and theoretical analysis of the BT40tool holder and theHSK-A63tool holder, the three-dimensional solid model of tooling system and dataacquisition module are established by Pro/E5.0. Set material attributes according to thematerial properties of the parts in the finite element software, and impose the boundary constrains and load conditions in finite element model. We analyze the stress and strainfield of tooling system and data acquisition module with a well divided grid cell in this part.These results will not only adjust and modify its unreasonableness structural design of toolholder, but also useful for the optimizing of the structural form.The dynamic models of non-standard tooling system with thermocouple temperaturemeasurement in the free and operating constraint conditions are established by finiteelement modal analysis. The frequencies and modal shapes of tooling system are calculated;based on different excitations caused by unbalance, dynamic responses and changing rulesof the tooling system are analyzed by the finite element software.Through the experimental study on the processing of the tooling system, the principleand method of modal experimental analysis and dynamic testing are determined; thearrangement, assembly and debugging of the experimental facilities are completed. Byemploying experimental model analysis of tooling system with temperature measurement,the effectiveness of the finite element model is verified. Furthermore, the experimentalresults show the validity and feasibility of finite element simulation results. Dynamiccharacteristics experiment tests the impact of the BT40tooling system with temperaturemeasuring device on the vibration of the machine, the results show that the temperaturemeasuring device can satisfy the demands of temperature measurement. Finally, thedynamic balance of HSK-A63tooling system with temperature measurement is carried outby dedicated balancing machines. After multiple dynamic balancing emendations, theresults show that HSK-A63tooling system can meet the requirements of high-speedtemperature measurement.