Study On The Application Of Dynamic And Dynamic Support In Drilling Rod Anti - Deviation Of Deep Hole Machining

With the rapid development of such industries as nuclear, aviation, metallurgy and defense, higher precision requirements have been put forward to the quality of deep role processing. Moreover, hole axis deviation during deep role processing is one important technical index reflecting the quality of the deep role processing. Because of the particular processing environment and technologies, deviations are very common during deep role processing, which may impact direct influences on the quality of the deep role processing. Therefore, how to avoid the deviations during deep hole processing for drill pipe is the key to improve the quality of deep role processing.Based on the development and research status of deep hole processing, the advantages and disadvantages of various deep hole processing systems are summarized and the major reasons for the drill pipe deviation during deep hole processing are analyzed. First, a mechanical model for the deviations caused by tool system, drill pipe dead weight and lack of rigidity is established and the deviation of the model is calculated according to theories. And then, the new idea that fluid static and dynamic pressure supporting technology can be used to replace the "mechanical collision block" method to avoid the deviations of the drill pipe. Moreover, existing conditions of deep hole processing are combined to demonstrate the feasibility of the new method.According to the precision requirements of workpeiece and deep hole drilling parameters, the latest research results and basic theories of static and dynamic pressure supporting technology are combined to determine the basic parameters of the static and dynamic pressure supporting structure and the design location of the structure in the drill pipe. And then, the parameters of the static and dynamic pressure supporting structure are optimized and their3D models are established. The inner wall hole of the workpeice is combined with the structure designed for the drill pipe to firm a similar static and dynamic pressure supporting structure to support drill pipe and avoid deviations.The bearing capacity of the static and dynamic pressure supporting structure can be calculated according to static and dynamic pressure supporting theories, fluid lubrication theories and the practical conditions of deep hole processing, which should be compared with the load of the drill pipe to verify the feasibility of the structure in avoid deviations of drill pipe during deep hole processing. The influence of the fuel supply pressure of the deep hole processing system and the eccentricity ratio of the drill pipe on the bearing capacity of static and dynamic pressure supporting structure is analyzed and the influence curve is obtained.FLUENT stimulation software is adopted in this paper to stimulate the cutting fluid flow field within the static and dynamic pressure supporting structure, which is compared with the theoretical results to get the comparative analysis graph, so as to verify the feasibility of static and dynamic pressure supporting structure in avoiding deviation of drill pipe during deep hole processing based on theoretical calculations and numerical simulation. As a result, a new method is put forward in this paper to avoid deviations of drill pipe during deep hole processing and relative parameters of this method are gained to reduce the deviation value of hole axis during deep hole processing, which is of great importance in improving the quality and efficiency of deep hole processing.