scholarly journals Soil-tool interaction of a simple tillage tool in sand

2019 ◽  
Vol 85 ◽  
pp. 08007
Author(s):  
Lucian V. Fechete-Tutunaru ◽  
Ferenc Gaspar ◽  
Zoltan Gyorgy
Keyword(s):  
Rake Angle ◽  
Cutting Edge ◽  
Factorial Experiment ◽  
Forward Speed ◽  
Response Variable ◽  
Independent Variables ◽  
Edge Angle ◽  
Draft Force ◽  
Tillage Depth ◽  
Soil Bin

This study was focused to experimentally evaluate the draft force on a simple tillage tool operating in different conditions in sand. The soil-tool interaction was evaluated in controlled laboratory conditions in a soil bin. A full multilevel factorial experiment was used with one response variable and four experimental factors. The selected design 3 tools × 3 tillage depth × 3 rake angle × 3 forward speed with two replications had a total of 243 runs. Influence of four independent variables including tillage depth (15, 20, 25 cm), rake angle (25, 35, 50 degrees), forward speed (0.67, 0.98, 1.39 m/s) and cutting-edge angle of the tool (30, 45 and 60 degrees) on draft force as the dependent variable was evaluated.

The Effect of Cut Tool Geometric Parameters on Tool Tear of Machining Nickel-Base GH4169 Super Alloys

2010 ◽  
Vol 37-38 ◽  
pp. 1457-1461 ◽  
Author(s):  
Zhao Peng Hao ◽  
D. Gao ◽  
R.D. Han
Keyword(s):  
Tool Life ◽  
Cutting Speed ◽  
High Strength ◽  
Rake Angle ◽  
Geometric Parameters ◽  
Cutting Edge ◽  
Factors Affecting ◽  
Edge Angle ◽  
Coated Tools ◽  
Nickel Base

Nickel-based super alloy GH4169 has been widely used in aerospace industry because of its good mechanical properties under high temperature. However, it is difficult to machine for its high strength, poor thermal conductivity and serious work-hardening. The effects of tool geometric parameters on tool life are studied by machining experiments using YG8 tools with different cutting edge angle in this paper. The tool with cutting edge angle 45°has longer tool life than 75°. The cutting experiments have been carried out using TiAlN (PVD) coated tools (AC520U) with different rake angle. It shows that the tool life with rake angle 9° were increased by 50% and 25% compared to tool with rake angle 3°and 6° when cutting speed is 30m/min. The tool with rake angle 9° is not suitable for cutting GH4169 when cutting speed is more than 35m/min. The results show that geometric parameter of cutting tool is one of the important factors affecting tool life.

Study on Machinery Cutting Technology of Ceramic Parts

2011 ◽  
Vol 127 ◽  
pp. 163-167
Author(s):  
Dong Mei Jiang ◽  
Qiang Wang
Keyword(s):  
Programming Model ◽  
Orthogonal Cutting ◽  
Cutting Speed ◽  
Optimal Solution ◽  
Rake Angle ◽  
Processing Parameters ◽  
Cutting Edge ◽  
Edge Angle ◽  
Decision Making Unit ◽  
Tool Cutting

The machinability of ceramics is evaluated by data envelopment analysis, mathematical programming model is constructed, then the optimal solution of decision-making unit is found. These reference values of he tool rake angle, clearance angle, tool cutting edge angle, minor cutting edge angle, tool cutting edge inclination angle, tip ARC radius and cutting speed, back engagement and the range of feeds are obtained through by orthogonal cutting test, these processing parameters are optimized, then better processing results are achieved. Considering the problem of Machining of ceramic materials, the techniques of mechanical cutting process, ceramic turning, grinding, drilling, et al are discussed.

Tool Geometry Effect on Machined Surface Integrity in Precision Turning High-Strength Spring Steel

2004 ◽  
Vol 471-472 ◽  
pp. 380-384 ◽  
Author(s):  
H.X. Wang ◽  
Wen Jun Zong ◽  
Ying Chun Liang ◽  
Shen Dong
Keyword(s):  
Surface Roughness ◽  
High Strength ◽  
Rake Angle ◽  
Spring Steel ◽  
Cutting Edge ◽  
Tool Geometry ◽  
Machined Surface ◽  
Edge Angle ◽  
Precision Turning ◽  
Machined Surface Integrity

In this paper, Based on regression analysis of tests, three comprehensive experimental models were presented in precision turning high-strength spring steel, Vicker’s hardness, residual stresses and surface roughness can be predicted utilizing these models. And the influence of tool geometry on machined surface integrity was analyzed systematically. The analytical results show that Vicker’s hardness and compressive residual stress will increase with the decrease of rake angle, clearance angle, cutting edge angle or minor cutting edge angle, surface roughness increases with an increase of rake angle or clearance angle and decreases with an increase of cutting edge angle or minor cutting edge angle.

Design and Experimental Investigation of a Bionic Subsoiler with a Multiplex-Modality Shank

2012 ◽  
Vol 184-185 ◽  
pp. 125-129
Author(s):  
Qiang Zhang ◽  
Lu Lu Yu ◽  
Yu Jing Sun ◽  
Miao Hao ◽  
Lu Zhang ◽  
...  
Keyword(s):  
National Standard ◽  
Forward Speed ◽  
Cutting Depth ◽  
Power Requirement ◽  
Design Concepts ◽  
Claw Morphology ◽  
Arc Shape ◽  
Structure Scheme ◽  
Tillage Depth ◽  
Soil Bin

Based on study of animal-claw morphology, a multiplex-modality subsoiler is designed with an intention to decrease its operating resistance. Design concepts and structure scheme of the subsoiler are presented. To analyze the performance of multiplex-modality subsoiler, a multiplex modality sub-soiling shovel and a national standard regulated arc-shape subsoiler (JB/T 9788-1999) are tested in soil bin. Effect of tillage depth and operating speed on the operating resistance of sub-soiling shovels is examined. Type of subsoilers, tillage depth and forward speed, with 2, 3 and 3 levels taken respectively, are considered in experiment. Experiment results show that the multiplex-modality subsoiler, compared with the standard arc-shape subsoiler, sees much lower operating resistance and power requirement against soil. Resistance-decreased index of the multiplex modality subsoiler are 45.3%, 34.4% and 34.2% at 300, 350 and 400mm cutting depth, respectively.

scholarly journals SIMULATION OF DRAFT FORCE FOR THREE TYPES OF PLOW USING RESPONSE SURFACE METHOD UNDER VARIOUS FIELD CONDITIONS

2018 ◽  
Vol 49 (6) ◽  
Author(s):  
S. Almaliki
Keyword(s):  
Response Surface ◽  
Response Surface Method ◽  
Influential Factor ◽  
Silty Clay ◽  
Forward Speed ◽  
Surface Method ◽  
Draft Force ◽  
Tillage Depth ◽  
Models Validation ◽  
Cone Index

In this study a mathematical models were developed to simulate draft force for three types of plows (moldboard, chisel and disk plow). The study was carried out in the experimental field of Agricultural Machinery Department at University of Basrah, which had silty clay soil texture. Independent parameters included three levels of tillage depth (0.15, 0.20 and 0.25m), three forward speeds (0.54, 0.83 and 1.53 m/s) and two levels of cone index (550 and 980 kPa). Response Surface Method (RSM) was utilized to produce models and to analyze results. Acquired results were used to extract accurate model for draft force. The draft force increased by 114% when tillage depth increased from 15 to 25 cm. Increasing forward speed from 0.54 to 1.53 m/s led to increased draft force by 80%. The cone index had positive effect on draft force by 42% when increased cone index from 550 kPa to 980 kPa. The most influential factor in draft force is the tillage depth, followed by the forward speed and cone index. The highest draft requirements were recorded for moldboard plow, followed by chisel and disk plow. Models validation was acceptable ( R-Squared = 0.97) and the draft force could be predicted with reliability of about 95%.

scholarly journals Statistical modeling, Sobol sensitivity analysis and optimization of single-tip tool geometrical parameters in the cortical bone machining process

2019 ◽  
Vol 234 (1) ◽  
pp. 28-38 ◽  
Author(s):  
Vahid Tahmasbi ◽  
Mehdi Safari ◽  
Jalal Joudaki
Keyword(s):  
Sensitivity Analysis ◽  
Cortical Bone ◽  
Surface Quality ◽  
Rake Angle ◽  
Cutting Edge ◽  
Numerical Control ◽  
Geometrical Parameters ◽  
Machining Parameters ◽  
Edge Angle ◽  
Input Parameters

Machining and cutting of cortical bones are very common and important in the field of orthopedic surgeries. Considerable advances in bone machining are obtained by using computer numerical control machines and automatic surgery robots but still, researches are needed to investigate the effects of machining parameters in bone machining. In this article, for the first time, the effect of geometrical parameters of the single-tip tool on cortical bone machining is studied. The machining parameters included in the investigation are rake angle, back rake angle and side cutting edge angle and the response surface methodology is used to analyze the obtained surface quality according to a second-order regression model. The sensitivity of surface quality to the input parameters was measured by applying Sobol sensitivity analysis and the results are optimized by the Derringer algorithm. Finally, the optimum tool is determined as 15° rake angle, −5° back rake angle and 30° side cutting edge angle. Furthermore, the sensitivity of the surface quality to the input parameters is determined as 52% for rake angle, 31% for side cutting edge angle and 17% for back rake angle.

DEM simulation for draft force prediction of moldboard plow according to the tillage depth in cohesive soil

2021 ◽  
Vol 189 ◽  
pp. 106368
Author(s):  
Yeon-Soo Kim ◽  
Md. Abu Ayub Siddique ◽  
Wan-Soo Kim ◽  
Yong-Joo Kim ◽  
Sang-Dae Lee ◽  
...  
Keyword(s):  
Cohesive Soil ◽  
Dem Simulation ◽  
Force Prediction ◽  
Draft Force ◽  
Tillage Depth ◽  
Moldboard Plow

scholarly journals Interlocking Spikes for Extreme Mobility

2020 ◽  
Author(s):  
Volker Nannen ◽  
Damian Bover
Keyword(s):  
Fundamental Problem ◽  
Weight Ratio ◽  
Penetration Resistance ◽  
Rake Angle ◽  
Vehicle Stability ◽  
Engineering Science ◽  
Critical Depth ◽  
Low Thrust ◽  
Penetration Force ◽  
Draft Force

The interlock drive system generates traction by penetrating articulated spikes into the ground and by using the natural strength of the ground for traction. A fundamental problem of traction by interlocking spikes is how to penetrate the ground such that the spike will withstand the draft force. The theory of critical depth suggests that a high rake angle reduces soil fragmentation, while vehicle stability and demand for a high pull/weight ratio require a low thrust angle. To satisfy both requirements, we connect an interlocking spike with a high rake angle via a lever arm to a hinge close to the ground for a low thrust angle. The resulting friction of the spike with the soil increases the vertical penetration force during penetration. Experimental data shows that such a spike penetrates soil of a much higher penetration resistance than predicted from an analysis of the forces involved, possibly because the spike follows the path of least resistance. To better understand and improve the potential of interlocking spikes for mobility in extreme terrain, we need a comprehensive experimental analysis. Accepted Paper in Proc. Earth & Space 2020: 17th Biennial ASCE International Conference on Engineering, Science, Construction and Operations in Challenging Environments, ASCE, Seattle WA.

scholarly journals Optimization of Boring Process Parameters in Manufacturing of Polyacetal Bushing using High Speed Steel

2019 ◽  
Vol 130 ◽  
pp. 01031 ◽  
Author(s):  
The Jaya Suteja ◽  
Yon Haryono ◽  
Andri Harianto ◽  
Esti Rinawiyanti
Keyword(s):  
Surface Roughness ◽  
Process Parameters ◽  
Feed Rate ◽  
High Speed ◽  
Removal Rate ◽  
High Speed Steel ◽  
Cutting Edge ◽  
Depth Of Cut ◽  
Optimum Result ◽  
Edge Angle

Polyacetal is commonly used as bushing material because of its low coefficient of friction and self lubricant characteristics. The polyacetal is machined by using boring process to produce bushing in certain surface roughness. The objectives of this research are to optimize three independent parameters (depth of cut, feed rate and principal cutting edge angle) of boring process of polyacetal using high speed steel tool to achieve the highest material removal rate and the required surface roughness. Response Surface Methodology is used to investigate the influence of the parameters and optimize the boring process. The research shows that the influence of the boring process parameters on polyacetal is similar compared to on metal. The result reveals that the optimum result is achieved by applying the value of depth of cut, feed rate, and principal cutting edge angle is 2.9 × 10–3 m, 0.229 mm rev–1, and 99.1° respectively. By applying these values, the maximum material rate removal achieved in this research is 1263.4 mm3 s–1 and the surface roughness achieved is 1.57 × 10–6 m.

scholarly journals Study on the Interaction between Soil and the Five-Claw Combination of a Mole Using the Discrete Element Method

2018 ◽  
Vol 2018 ◽  
pp. 1-11 ◽  
Author(s):  
Yuwan Yang ◽  
Mo Li ◽  
Jin Tong ◽  
Yunhai Ma
Keyword(s):  
Discrete Element Method ◽  
Discrete Element ◽  
Rake Angle ◽  
Soil Resistance ◽  
Distance Ratio ◽  
Soil Failure ◽  
Soil Cutting ◽  
Soil Bin ◽  
Rupture Distance ◽  
Element Method

A mole is a born digger spending its entire existence digging tunnels. The five claws of a mole’s hand are combinative to cut soil powerfully and efficiently. However, little was known in detail about the interaction between the soil and the five-claw combination. In this study, we simulated the soil cutting process of the five-claw combination using the discrete element method (DEM) as an attempt for the potential design of soil-engaging tools to reduce soil resistance. The five-claw combination moved horizontally in the soil bin. Soil forces (draught and vertical forces) and soil failure (soil rupture distance ratio) were measured at different rake angles and speeds. Results showed that the draught and vertical forces varied nonlinearly as the rake angle increased from 10 to 90°, and both changed linearly with the speed increasing from 1 to 5 m/s. The curve of the soil rupture distance ratio with rake angles could be better described using a quadric function, but the speed had little effect on the soil rupture distance ratio. Notably, the soil rupture distance ratio of the five-claw combination in simulation was on average 19.6% lower than the predicted ratio of simple blades at different rake angles indicating that the five-claw combination could make less soil failure and thereby produce lower soil resistance. Given the draught and vertical forces, the performance of the five-claw combination was optimized at the rake angle of 30°.

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