Study On The Chip-breaking Mechanism Of Turning Inserts With 3-D Complex Groove At High Speed Cutting

This thesis is the part of subject"The exploitation and research on chip-breaking technology and production at high speed cutting", came from Youth technology special fund of Heilongjiang province and Youth scientific research fund of Harbin city. High-speed machining (HSM) was of the advanced and applied manufacturing technology, and became the developed direction of the metal cutting. But the process of manufacture Hade not achieved the idealization, because the exceptional break ratio of automatic production line or stand-alone is very highly, and the stability of manufacture system is bad, so the main problem is chip control in the process of high speed cutting. The fundamental research and Experimental study on the chip-breaking mechanism turning insert with 3-D complex groove at High Speed, which is the main content in the paper.Firstly, carrying out the experiments which adopted the representative type of 3-D Complex groove turning insert, it was 11 kinds of speeds at the constant and high speed cutting; The experimental data was analyzed, and the connection of the critical feed-rate and chip breaking scopes at high cutting speeds were built by the method of Quadratic Polynomial Fitting, Cubic Polynomial Fitting, Regression analysis, Harmonic analysis, Cubic Spline Interpolation; The right mathematical model was chosen, that error was minor and calculate was simply. The study above lays a theory and tests basis for the further investigation of the mechanism of chip breaking by 3-D groove insert in high speed machining.Secondly, the chip-breaking curve of 2-D and 3-D complex groove insert is contrasted and analyzed; Mathematical model of the critical feed-rate and the critical depth of cut are developed by chip-breaking conditions and groove characteristic of the 3-D complex groove turning insert TNMG160408-QM.Lastly, for confirming the accuracy of the relation between the critical feed-rate and speed and the relation between the chip breaking scopes and speed, we do the experiment of chip-breaking strain. Firstly, the experiment equipment of beak strain is designed and made by the chip-breaking principle;and do the experiment of chip-breaking strain; lastly, the result of experiment is analyzed and studied.