Structure Design And Chip Removal Performance Research Of BTA Internal Spiral Drill Pipe

As an important part of the machinery manufacturing industry,deep hole processing is the most difficult and the most technologically advanced one in various hole processing industries.In the process of deep hole machining,due to its special manufacturability and the limited space for chip evacuation,the chips generated during the cutting process are very prone to chip jamming during the discharge process,resulting in a sudden interruption of the machining process.The quality has a very big impact,and more seriously,the cutting edge of the tool will be damaged,and the slender drill rod will be damaged.Therefore,the breakthrough of the chip removal technology problem is of great significance to the development of deep hole processing technology.Although domestic and foreign research scholars have been doing a lot of research on the problem of chip evacuation during deep hole machining,there is currently no particularly effective solution.Based on the BTA deep hole drilling,this paper considers starting from changing the flow state of the chip fluid in the drill pipe channel to speed up the cutting fluid flow rate,thereby improving the chip evacuation effect,and proposes to improve the structure of the traditional BTA chip evacuation drill rod.Designed plan.This paper first studies the working principle of BTA deep hole drill,analyzes and summarizes the methods that can be used to solve the problem of difficult chip evacuation during the processing process,proposes an improvement plan for the existing chip evacuation device,and introduces the new concept of spiral flow.The spiral flow field plays a very important role in fluid flow due to its unique motion mode.Therefore,it is considered to add an internal spiral groove in the traditional cylindrical drill rod,and the spiral flow is used to accelerate the flow rate of the cutting fluid in the channel.Then,the mathematical model of the fluid in the drill pipe channel is established through theoretical analysis.However,due to the complex flow characteristics of the spiralflow field,its theoretical research is not comprehensive,so the Fluent software of computational fluid mechanics is used,combined with the geometry in UG and ANSYS.,ICEM CFD,CFD POST and other software modules model and simulate the chip removal drill rod before and after the improvement,and truly simulate the flow state of the cutting fluid in the drill rod.Finally,the different effects of structural parameters such as the radius,number,axial length,and helix angle of the semi-circular spiral groove on the cutting fluid flow rate and pressure in the drill rod were studied separately.The maximum flow rate reached at the central axis was analyzed.By comparison,the optimal spiral groove parameter combination is ? = 15 °,r = 2mm,n = 6,m = 600 mm.By comparing and analyzing the structure of the drill pipe before and after the improvement,it is concluded that the maximum flow rate of the cutting fluid in the improved drill pipe channel is increased by about 7.9%,which proves that it has an effect of improving the chip removal in the BTA drilling system.