Influence Of Rake Angle Research Articles

Prediction of straight tooth milling of Scots pine wood by shank cutter based on neural net computations and regression analysis

Regression models and a neural net approach were used to predict the cutting performance during milling of Scots pine (Pinus sylvestris L.) by shank cutter. The influence of rake angle, spindle speed, and milling depth on surface roughness of the workpiece, as well as the connection between the milling force and the surface roughness, were thoroughly considered. Four approaches were used to predict the workpiece’s surface roughness based on the experimental data: Back Propagation Neural Network (BPNN), Radial Basis Function Neural Network (RBFNN), Support Vector Machines (SVM), and multiple linear regression. The comparative analysis of the predictive models showed that Neural Network (NN) had preferable performance for prediction of machined surface roughness, with an R2 of 0.98. The SVM had certain fluctuations and the R2 of the multiple linear regression was just 0.87, indicating that they did not fit well for prediction machined surface roughness. In summary, the effective trend of milling parameters on the machined surface roughness of Scots pine was similar to multiple nonlinear regression, and the accurate prediction by BPNN model can provide technical support for the surface roughness of the Scots Pine and enhance shank cutter performance.

Influence of rake angle and nose radius on optical silicon nanomachining feed rate and surface quality: a modelling, prediction and optimisation study

Silicon is widely used in infrared (IR) optics due to its high transmissive ability at wavelength (λ) ranging from 1.2 μm to 6.0 μm. However, optical components of high quality require surface roughness (Ra) below or equal to 8 nm. Ultra-high precision single-point diamond turning of optical silicon has filled this gap due to enhanced chip removal, well-defined grain structure and low coefficient of friction of diamond tool. This study aimed at reducing optical silicon Ra value by manipulating both cutting parameters and tool geometry. The recommended Ra value of less than 8 nm was achieved with standard runs 5, 6, 8, 9, and 10 respectively. Also, high surface roughness due to high feed rate was noted to be greatly reduced at high tool negative rake angle and nose radius. Additionally, with increase in tool nose radius at 0° rake angle, poor surface quality resulting from high feed rate reduced.

Influence of rake angle and nose radius on optical silicon nanomachining feed rate and surface quality: a modelling, prediction and optimisation study

Silicon is widely used in infrared (IR) optics due to its high transmissive ability at wavelength (λ) ranging from 1.2 μm to 6.0 μm. However, optical components of high quality require surface roughness (Ra) below or equal to 8 nm. Ultra-high precision single-point diamond turning of optical silicon has filled this gap due to enhanced chip removal, well-defined grain structure and low coefficient of friction of diamond tool. This study aimed at reducing optical silicon Ra value by manipulating both cutting parameters and tool geometry. The recommended Ra value of less than 8 nm was achieved with standard runs 5, 6, 8, 9, and 10 respectively. Also, high surface roughness due to high feed rate was noted to be greatly reduced at high tool negative rake angle and nose radius. Additionally, with increase in tool nose radius at 0° rake angle, poor surface quality resulting from high feed rate reduced.

Influence of Rake Angle, Bucket Width and Teeth Depth of Dragline Bucket on the Resistive Force in Different Rock Types

Draglines are used to dispose the overburden for exposing minerals in a surface mine. Draglines may be greater than 4000 t in overall weight, with bucket capacity ranging from 24 to 120 m 3 . The buckets are dragged against the blasted muck to fill the blasted overburden materials 1 . Bucket teeth fail easily while the excavator is being operated due to the fact that they are in direct touch with the rocks. The bucket teeth have an appropriate geometrical design for longer life and cost reduction 2 .

Modeling and analysis of force prediction in milling process of unidirectional fiber reinforced polymer composites

The cutting force is one of the main factors that influence the processing quality of fiber-reinforced polymer composites (FRPs). However, since the material removal mechanics of composites are quite different from those of metals, the cutting mechanisms of metals cannot be directly used for orthogonal cutting of composites. This paper aims to develop a novel force prediction model without the need to run any experiments. The deformation of fiber and the support of surrounding matrix are analyzed based on the minimum potential energy principle and the dynamic equilibrium. A force prediction model of FRP cutting is obtained for fiber orientations ranging from 0 to 90° + γ. The relevant experiments conducted showed the validity of the proposed model. The influence of rake angle and clearance angle on cutting force is analyzed.

Influence of rake angle of left hand helical tool with right hand cut on cutting phenomena in micro end-milling

Influence of rake angle of left hand helical tool with right hand cut on cutting phenomena in micro end-milling

Cutting Forces and Chip Morphology in Medium Density Fiberboard Orthogonal Cutting

The influence of rake angle, cutting speed, and uncut chip thickness on cutting forces and chip morphology in medium density fiberboards orthogonal cutting was investigated. With regard to the normal cutting force and the feed force recorded, there were important variations when machining conditions were modified, or when some tool characteristics were changed. The findings led to the conclusion that there was a close relationship between the cutting conditions and chip formations as well as the cutting forces. Such forces were found to be particularly sensitive to changes in uncut chip thickness, as well as showing dependence on the cutting speed of the tools in orthogonal cutting.

FEM machining analysis: influence of rake angle in cutting of aluminium alloys using Polycrystalline Diamond cutting tools

In this paper, a prediction of the thermo mechanical behaviour of the machining of an aluminium alloy is made, using a Polycrystalline Diamond (PCD) cutting tool with a variable rake angle. To aid the study, a commercial machining finite element software was used and several parameters In conclusion, from the simulations made, it was possible to predict a positive influence of the inclusion of rake angle in PCD cutting tools. A reduction of cutting forces and temperature was shown with the increase of the rake angle, allowing this way an additional extension of the tool life.

Analysis of Mechanical Property of Crystal KDP and Simulation of Ultra-Precision Cutting Process in the Ductile Mode

In order to study mechanical property with different crystal-plane and different crystal orientation of the crystal KDP, nano-indentation experiments are first done. The mechanical properties of crystal KDP, such as elastic modulus, yielding stress, are obtained from the analysis of the experimental curve. To obtatin the stress-strain curves of crystal KDP, by using the spherical tip can get characteristic of continuous strain, the spherical indentation experiments is proposed firstly and carried out. According to obtained parameters, A finite element cutting model of crystal KDP is established. The cutting process of crystal KDP is simulated by the model, and the influence of rake angle and depth of cut on chip and surface quality is studied. The theory shows that when the cutter’s rake angle is in the range of -40° to -45°, an perfect super-smooth KDP crystal surface will be obtained. Finaly, the experiments is carried out on special ultra-precision machine tool for crystal KDP by ourself devoloping. Experiment results show that when the cutter’s rake angle is about -45°, an super-smooth surface (rms: 6.521nm and Ra: 5.151nm )is obtained on the plane (001), and this experiment certified correctness of theory analysis.

455 切削残留応力に及ぼす切れ刃すくい角および逃げ面接触幅の影響(切削・研削・研磨加工I,オーガナイズドセッション,人体のコンピュータモデルの作成とその応用,特別講演)

455 切削残留応力に及ぼす切れ刃すくい角および逃げ面接触幅の影響(切削・研削・研磨加工I,オーガナイズドセッション,人体のコンピュータモデルの作成とその応用,特別講演)

The influence of rake angle, cutting feed and cutting depth on residual stresses in hard turning

Hard turning is replacing grinding as a method in the production of precision steel products. There are several reports from research works describing the effects on the residual stress and the improvement of the fatigue life of hard turned products. This paper describes how rake angle and cutting parameters affect the residual stresses in turning. Face turning with constant speed in AISI 52100 was used. Cutting feed and cutting depth were investigated, but the main focus was on rake angle influence. The residual stresses were measured using the X-ray diffraction method in both speed and feed direction. The material was etched down to a depth of 100 μm in order to monitor residual stresses in the whole of the affected depth. Altered cutting feeds and rake angle clearly produced significant changes in residual stresses. Results show that rake inclination had the strongest influence on the residual stresses. The compressive stresses become greater with increased feed rate. Different cutting depths did not generate different stress levels. The results show that it is possible to produce tailor-made residual stress levels by controlling the tool geometry and cutting parameters.

The influence of rake angle, cutting feed and cutting depth on residual stresses in hard turning

Hard turning is replacing grinding as a method in the production of precision steel products. There are several reports from research works describing the effects on the residual stress and the improvement of the fatigue life of hard turned products. This paper describes how rake angle and cutting parameters affect the residual stresses in turning. Face turning with constant speed in AISI 52100 was used. Cutting feed and cutting depth were investigated, but the main focus was on rake angle influence. The residual stresses were measured using the X-ray diffraction method in both speed and feed direction. The material was etched down to a depth of 100 μm in order to monitor residual stresses in the whole of the affected depth. Altered cutting feeds and rake angle clearly produced significant changes in residual stresses. Results show that rake inclination had the strongest influence on the residual stresses. The compressive stresses become greater with increased feed rate. Different cutting depths did not generate different stress levels. The results show that it is possible to produce tailor-made residual stress levels by controlling the tool geometry and cutting parameters.

An Investigation of the Influence of Feed and Rake Angle on the Ratio of Feed Force to Cutting Force when Machining with Negative Rake Angle Tools

Experimental orthogonal machining results are given which show that the ratio of the force normal to the cutting direction to the force in this direction increases with decrease in undeformed chip thickness as well as with increase in negative rake angle. While the influence of rake angle is well known and relatively easy to explain it appears that the influence of undeformed chip thickness is less well known and so far lacks a satisfactory explanation. The purpose of this paper is to explain this effect in terms of the mechanics of the process.

The Influence of Higher Rake Angles on Performance in Milling

Abstract This paper presents the results of research on the influence of rake angle on metal-cutting performance when using high-speed-steel cutters. A range of rake angles and cutting speeds was selected and studies made on cutter life and surface finish as a function of these variables. The effect of these variables on such basic quantities as forces, shear angle, chip friction, work done in cutting, and the calculated temperature on the chip-tool interface also was investigated. In several cases, excellent performance was obtained using higher rake angles (of the order of 25 deg to 40 deg) at higher cutting speeds. This observed performance is analyzed in relation to the basic factors.