Analyzing the Effects of the Kinematic System on the Quality of Holes Drilled in 42CrMo4 + QT Steel

Abstract

This article discusses the relationship between the kinematic system used in drilling and the quality of through-holes. The drilling was done on a CTX Alpha 500 universal turning center using a TiAlN-coated 6.0 mm drill bit with internal cooling, mounted in a driven tool holder. The holes were cut in cylindrical 42CrMo4 + QT steel samples measuring 30 mm in diameter and 30 mm in length. Three types of hole-drilling kinematic systems were considered. The first consisted of a fixed workpiece and a tool performing rotary (primary) and linear motions. In the second system, the workpiece rotated (primary motion) while the tool moved linearly. In the third system, the workpiece and the tool rotated in opposite directions; the tool also moved linearly. The analysis was carried out for four output parameters characterizing the hole quality (i.e., cylindricity, straightness, roundness, and diameter errors). The experiment was designed using the Taguchi approach (orthogonal array). ANOVA multi-factor statistical analysis was used to determine the influence of the input parameters (cutting speed, feed per revolution and type of kinematic system) on the geometrical and dimensional errors of the hole. From the analysis, it is evident that the kinematic system had a significant effect on the hole roundness error.

Influence of the Kinematic System on the Geometrical and Dimensional Accuracy of Holes in Drilling

“…Still, other studies [ 1 , 18 ] involved determining the effect of the tool coating on the hole diameter error, which was calculated as a function of the number of holes drilled. The effects of the cutting speed, feed per revolution, and kinematic system on the geometrical and dimensional accuracy of holes drilled in 42CrMo4 + QT steel were discussed in the previous article by the authors [ 19 ]. The experiments showed that the hole roundness error was mainly dependent on the kinematic system (65%); the influence of the cutting speed and feed per revolution was much smaller (16% and 6%, respectively).…”

Experimental Study and Verification of New Monolithic Rotary Cutting Tool for an Active Driven Rotation Machining

“…This material is slightly corrosion resistant due to its low chromium content. In the annealed state, it is well machinable [ 21 ]. After heat treatment, machining is most often limited to finish grinding.…”

A Study of the Kinematics System in Drilling Inconel 718 for Improving of Hole Quality in the Aviation and Space Industries

“…The hole diameter, cylindricity and straightness errors were measured using a ZEISS PRISMO Navigator (Figure 4) coordinate measuring machine at the Department of The hole diameter, cylindricity and straightness errors were measured using a ZEISS PRISMO Navigator (Figure 4) coordinate measuring machine at the Department of Manufacturing Engineering and Metrology of the Kielce University of Technology. The machine features excellent dynamics, high speed with maximum precision, outstanding resistance to ambient conditions, high rigidity, and passive vibration damping with elastomer spring elements [12]. The measurements were taken at a speed of 5 mm/s using a ruby probe stylus ball tip with a radius of 1.5 mm.…”

“…machine features excellent dynamics, high speed with maxim resistance to ambient conditions, high rigidity, and passiv elastomer spring elements [12]. The measurements were taken a ruby probe stylus ball tip with a radius of 1.5 mm.…”

“…When drill bits with a greater diameter and a smaller angle of the cooling channel were used, the holes had the lowest surface roughness. The research described in [12,13] is concerned with the influence of the cutting speed, feed per revolution, and the type of kinematic system on the geometrical and dimensional accuracy of holes drilled in 42CrMo4 + QT steel and C45 steel. For 42CrMo4 + QT steel the first kinematic system is the most suitable, as 3 out of 4 parameters studied (CYL, STR, RON) reached the lowest values.…”