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

Bronis, Mateusz; Miko, E.; Nowakowski, Łukasz

doi:10.3390/ma14164568

Cited by 4 publications

(5 citation statements)

References 23 publications

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“…From Table 9, it is clear that the kinematic system and the spindle speed had little influence on this parameter (7.19% and 2.32%, respectively). In contrast to other studies [12,13], this analysis shows that the hole cylindricity error was mainly dependent on the other process parameter studied, i.e., the feed per revolution. For Inconel 718, feed per revolution was the key factor affecting the hole straightness and diameter errors.…”

Section: Statistical Analysis (Anova)contrasting

confidence: 98%

“…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.…”

Section: Introductionmentioning

confidence: 99%

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

et al. 2022

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This article discusses experimental results concerning the quality of through holes drilled in Inconel 718. The tests involved hole cutting under 27 different conditions using different values of the feed per revolution and spindle speed, and different types of kinematic system. The drilling was performed on a CTX Alpha 500 universal turning center using tools with internal coolant supply. Three kinematic systems were considered for hole cutting. The first, based on the driven tool holder, had a stationary workpiece and a rotating and linearly fed tool. In the second, where drilling was based on the spindle rotations, the workpiece rotated while the tool moved along a straight line. In the third system, the workpiece and the tool rotated in opposite directions; the tool also performed a linear motion. The study aimed to assess the quality of holes on the basis of the following output parameters: the hole diameter, cylindricity and straightness errors, and the surface texture. A multifactorial statistical analysis was used to determine how the hole quality was dependent on the process parameters and the type of drilling kinematics. The findings confirm that the kinematic system, as well as the feed per revolution, are the key factors affecting the quality of holes drilled in Inconel 718. The analysis of the hole drilling process for Inconel 718, performed using a CNC turning center, shows that the third kinematic system was the best option as all the four parameters describing the hole quality had the lowest values. The best results were obtained in the 6th (n = 637 rpm, fn = 0.075 mm/rev, KIN III) and 8th experiments (n = 955 rpm, fn = 0.075 mm/rev, KIN II), because the parameters were then the lowest, with the scatter of results being up to 30%.

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Section: Statistical Analysis (Anova)contrasting

confidence: 98%

Section: Introductionmentioning

confidence: 99%

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

et al. 2022

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“…The novelty of our research work lies in the complexity and scope of the considered explanatory variables. Above all, in that, unlike other publications [ 37 , 38 , 39 , 40 , 41 , 42 , 43 ], we also consider such tool factors (point angle—ε r , lip relief/clearance angle—α o , and helix angle—ω r ) that meet the condition of mutual independence and the condition of orthogonality with respect to the DOE methodology. This article provides an adequate combination of experimental, numerical, and analytical approaches for hole drilling simulation.…”

Section: Discussionmentioning

confidence: 99%

“…For example, Ahmed et al [ 38 ] used linear regression analysis to create empirical models predicting the responses (tool life, cutting force, and specific cutting energy) in relation to the defined control variables (the tool material, cutting speed, and feed rate) during the drilling of AISI 304 and AISI 2205. As stated in [ 39 ], the modeling of drilling (not only steel) is accompanied by various difficulties (changing conditions of the contact of the tool with the material) and requires considerable computing time, therefore, the development of techniques in mathematical modeling and simulation represents new research trends in this area [ 40 ]. Storchak et al [ 39 ] dealt with the numerical modelling of drilling short holes in AISI 1045 material, and FEM and DOE were applied.…”

Section: Introductionmentioning

confidence: 99%

Experimental Analysis of Effect of Machined Material on Cutting Forces during Drilling

Sklenička,

Hnátík,

Fulemová

et al. 2024

Materials

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Current research studies devoted to cutting forces in drilling are oriented toward predictive model development, however, in the case of mechanistic models, the material effect on the drilling process itself is mostly not considered. This research study aims to experimentally analyze how the machined material affects the feed force (Ff) during drilling, alongside developing predictive mathematical–statistical models to understand the main effects and interactions of the considered technological and tool factors on Ff. By conducting experiments involving six factors (feed, cutting speed, drill diameter, point angle, lip relief angle, and helix angle) at five levels, the drilling process of stainless steel AISI1045 and case-hardened steel 16MnCr5 is executed to validate the numerical accuracy of the established prediction models (AdjR = 99.600% for C45 and AdjR = 97.912% for 16MnCr5). The statistical evaluation (ANOVA, RSM, and Lack of Fit) of the data proves that the drilled material affects the Ff value at the level of 17.600% (p < 0.000). The effect of feed represents 44.867% in C45 and 34.087% in 16MnCr5; the cutting speed is significant when machining C45 steel only (9.109%). When machining 16MnCr5 compared to C45 steel, the influence of the point angle (lip relief angle) is lower by 49.198% (by 22.509%). The effect of the helix angle is 163.060% higher when machining 16MnCr5.

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“…A decrease in roundness deviation of 50-77%, cylindricity deviation of 13-51% and surface roughness of 47% was observed with cryogenic drilling. Several articles [23][24][25][26] examined how three different input parameters-spindle speed, feed per revolution and three different drilling strategies-affect cylindricity deviation, straightness deviation, roundness deviation and hole diameter error. The above studies show that the use of a suitable drilling strategy can significantly reduce the individual output parameters evaluated.…”

Section: Introductionmentioning

confidence: 99%

Effect of Choice of Drilling Kinematic System on Cylindricity Deviation, Roundness Deviation, Diameter Error and Surface Roughness of Holes in Brass Alloy

Bronis,

Krawczyk,

Legutko

2024

Processes

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This article presents the results of an experimental study on the effect of the selection of kinematic system for the drilling process on the cylindricity deviation, roundness deviation, diameter error and surface roughness of holes in brass alloy. Three different kinematic systems based on the dependence of the direction of rotation of the workpiece and the drill bit were used. The drill bit was mounted in an axially driven holder that allowed it to be put into motion. Cutting tests were conducted at three different spindle speeds and three different feed rates per revolution (27 tests in total). A static ANOVA analysis was used to evaluate the effect of each input parameter on each output parameter. The results of this work have practical applications in machining. The following input parameters of the drilling process should be used to obtain the smallest values of each output parameter: for CYL, n = 4775 rpm, fn = 0.14 mm/rev and KIN III; for RON, n = 4775 rpm, fn = 0.1 or 0.12 mm/rev and KIN II; for DE, n = 3979 rpm, fn = 0.1 mm/rev and KIN I; and for Rz, n = 4775 rpm, fn = 0.1 mm/rev and KIN II. This research work also used Grey Relational Analysis with which input parameter optimization was derived. The optimal drilling parameters are spindle speeds of 4775 rpm, a feed per revolution of 0.1 mm/rev and the use of the first kinematic system. This paper also includes equations for predicting each parameter that describes the dimensional and shape accuracy and roughness of the hole surface. Using the first kinematic system reduced the roughness of the hole surface by as much as 58%. The correct selection of kinematic system improved its dimensional accuracy by 15%. On the other hand, the roundness deviation of the hole improved by 33% and the cylindricity deviation of the hole by 6%.

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

Cited by 4 publications

References 23 publications

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

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

Experimental Analysis of Effect of Machined Material on Cutting Forces during Drilling

Effect of Choice of Drilling Kinematic System on Cylindricity Deviation, Roundness Deviation, Diameter Error and Surface Roughness of Holes in Brass Alloy

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