Analysis And Research On The Straight Error Of The Deep Hole Machining Based On The BTA Cutting Tool System

The deep hole machining technology is an important part of modern manufact uring,and now is mainly used in high and new technology industries, such as energy, mining, automotive engine manufacturing, aerospace, petrochemical equipment, shipbuilding, power generation equipment, instruments and meters and other fields. In reality, the deep hole processing is in a closed or semi- closed state that make its working environment relatively complex and drilling unstable. The operator cannot directly watch the actual cutting conditions, so they judge the state only through practical experience or some of the basic conditions observed in the processing. In the actual production, it is prone to appear he phenomenon that the cutting tool system deviates from the center axis under the influence of various objective factors. That will increase p rocessing hole straightness error, even sometimes make workpiece scrap and unable to continue processing. So in actual machining process, the study on the influence factors and reduction measures of processing hole straightness error has very important significance.In this article, cutting tool system of BTA deep hole processing severed as the research object. The stress and tectonic characteristics of BTA deep hole cutter were analyzed, and force mathematical model of the BTA deep hole drilling tool was derived. Based on the model, reasonable position of cutter guide block and the influence of blade’s working approach angle and middle-tooth’s position on cutting tool force was analyzed and studied. the influence of drill pipe parameters on the stiffness was analyzed through setting up drill pipe rigidity mechanics model and using the advanced simulation module of UG NX software to simulate from the drill pipe length, wall thickness, rigidity of drill pipe;two kinds of support block structure were designed, that symmetrically arranged on the drill pipe using the dynamic pressure supporting to drill pipe improve stiffness. The feasibility of scheme was proved through the FLUENT simulation, and reasonable structure of the support block was concluded; The changes of cutter cutting force, axial force and torque were analyzed from two aspects of drilling tool wear and machining parameters to provide a reference for reducing the deep hole processing straightness error.