Materials Formation Mechanism and Experimental Verification of Micron Long Fiber

2011 ◽  
Vol 179-180 ◽  
pp. 49-54
Author(s):  
Chun Mei Yang ◽  
Yan Ma
Keyword(s):  
High Speed ◽  
Grip Force ◽  
Pure Shear ◽  
Wood Fiber ◽  
Cutting Speed ◽  
Tool Material ◽  
Reducing Power ◽  
Improved Method ◽  
High Speed Cutting ◽  
Wood Grain

In the paper the theory of cutting wood fiber on micron-level has been put forward, that is the cutting power of micron flake wood fiber is much smaller than the mechanical power consumed by grinding. Therefore, the manufacture method for micron flake wood fiber is a kind of way of materials preparation, which can economize energy, decrease in consumption and pollution. From the theoretical analysis, only a reasonable cutting-arrangement on direction can significantly reduce the power. So in the condition of reducing power, relying on pure shear to fracture fibers in tissue is the best effort, at the same time through the vertical ultra-high-speed cutting in grain, the micron filament fibers will be cut out. The influences produced by various factors for the formation of flake fibers have been verified through testing, including the improved tool material, the wood grain, the cutting speed and the improvements for locating specimen.Through the improved method for sluggish wood-fiber cutting, not only does this method reduce power consumption, but also decrease the probability of fiber cut off and substantial increase fiber’s length and quality. Moreover, after these flake fibers having been rescheduled, the elastic modulus of fiber MHFB hot pressed out can reach 5171Mpa, and the grip force of that can reach 1933N.

Experimental Study on High Alloy Antifriction Cast Iron in High-Speed Cutting

2010 ◽  
Vol 37-38 ◽  
pp. 432-434
Author(s):  
Lian Jie Ma ◽  
Zhen Tang Zhou
Keyword(s):  
High Speed ◽  
Cutting Speed ◽  
Tool Material ◽  
High Hardness ◽  
High Wear Resistance ◽  
Work Piece ◽  
Cast Irons ◽  
High Alloy ◽  
High Speed Cutting ◽  
Technical Requirements

In cutting experiment, high alloy antifriction cast irons were selected. Through high-speed cutting experimentation, the materials’ performance and requirement for tools were analyzed. The feasible cutting capacity and tool parameters were ascertained. The cutting defect and solving method were discussed. The results indicate that there are high hardness, high wear resistance and brittleness of high alloy antifriction cast irons. In ensuring the technical requirements of work-piece machining, PCBN is a better tool material. When the tool orthogonal rake angle =-6°, the tool’s durability is higher and machining quality is better. High cutting efficiency can be obtained, when cutting speed vc is from 75 to 100 m/min, the feedrate f is less than 8 mm/min, and the cutting depth ap is from 0.1 to 0.3 mm. These cutting dosages are appropriate in machining high alloy antifriction cast irons.

The Application of FEA in High-Speed Cutting

2011 ◽  
Vol 287-290 ◽  
pp. 104-107
Author(s):  
Lian Qing Ji ◽  
Kun Liu
Keyword(s):  
High Speed ◽  
Feeding Rate ◽  
Cutting Tools ◽  
Cutting Speed ◽  
Cutting Parameters ◽  
Material Model ◽  
Friction Model ◽  
Cutting Depth ◽  
High Speed Cutting ◽  
Key Technologies

The history and application of the FEA are briefly presented in this paper. Several key technologies such as the building of material model, the establishment of the chip - tool friction model as well as meshing are described. Taking the high-speed cutting of titanium alloy (Ti - 10V - 2Fe - 3Al) as an example , reasonable cutting tools and cutting parameters are determinted by simulating the influences of cutting speed, cutting depth and feeding rate on the cutting parameters using FEA.

Application and Advance in Super-Hard Tool Material

2011 ◽  
Vol 84-85 ◽  
pp. 228-231
Author(s):  
Jing Su ◽  
Yu Hua Zhang ◽  
Di Wang
Keyword(s):  
High Speed ◽  
High Performance ◽  
Cubic Boron Nitride ◽  
Tool Material ◽  
Polycrystalline Diamond ◽  
High Speed Cutting ◽  
Machining Quality ◽  
Finished Surface ◽  
Materials Used ◽  
Surface Precision

For the excellent properties, super-hard tool material has received much attention from researchers. The development of super-hard tool material for high-speed cutting could brought high machining quality and surface precision. For an engineer, adopt high performance of tool material, for example wearing resistance, high stability of PCD (polycrystalline diamond) and PCBN (poly cubic boron nitride) can get more information for obtaining higher finished surface quality that cannot acquire just by common cutting process. This paper introduces super-hard cutters materials (PCD and PCBN) development, and discusses several material properties. The features of materials used in different cutting fields are given.

Investigation of Surface Characteristics and Chip Morphology in High Speed Cutting of Inconel718 Based on SHPB System

2019 ◽  
Author(s):  
Zengqiang Wang ◽  
Zhanfei Zhang ◽  
Wenhu Wang ◽  
Ruisong Jiang ◽  
Kunyang Lin ◽  
...  
Keyword(s):  
Surface Roughness ◽  
High Speed ◽  
Split Hopkinson Pressure Bar ◽  
Orthogonal Cutting ◽  
Cutting Speed ◽  
Surface Profile ◽  
Chip Morphology ◽  
Depth Of Cut ◽  
Machined Surface ◽  
High Speed Cutting

Abstract High speed cutting (HSC) technology has the characteristics of high material removal rates and high machining precision. In order to study the relationships between chip morphology and machining surface characteristic in high speed cutting of superalloy Inconel718. High-speed orthogonal cutting experiment are carried out by used a high speed cutting device based on split Hopkinson pressure bar (SHPB). The specimen surfaces and collected chips were then detected with optical microscope, scanning electron microscope and three-dimensional surface profile measuring instrument. The results show that within the experimental parameters (cutting speed from 8–16m/s, depth of cut 0.1–0.5mm), the obtained chips are sawtooth chips and periodic micro-ripple appear on the machined surface. With the cutting speed increases, machining surface roughness is decreases from 1.4 to 0.99μm, and the amplitude of periodic ripples also decreases. With the cutting depth increases, the machining surface roughness increases from 0.96 to 5.12μm and surface topography becomes worse. With the increase of cutting speed and depth of cut, the chips are transform from continues sawtooth to sawtooth fragment. By comparing the frequency of surface ripples and sawtooth chips, it is found that they are highly consistent.

Investigation on surface quality of high-speed cutting titanium alloy Ti6Al4V based on Split-Hopkinson pressure bar

2020 ◽  
Vol 234 (10) ◽  
pp. 1293-1301 ◽  
Author(s):  
Zhanfei Zhang ◽  
Zengqiang Wang ◽  
Wenhu Wang ◽  
Ruisong Jiang ◽  
Yifeng Xiong
Keyword(s):  
Surface Roughness ◽  
Surface Topography ◽  
Surface Quality ◽  
High Speed ◽  
Split Hopkinson Pressure Bar ◽  
Cutting Speed ◽  
Depth Of Cut ◽  
Hopkinson Pressure Bar ◽  
High Speed Cutting ◽  
Pressure Bar

High-speed cutting technology has the characteristics of high material removal rate and excellent processing quality. To investigate the surface quality of high-speed cutting Ti6Al4V alloy, the orthogonal cutting experiment is the cutting device based on improved Split-Hopkinson pressure bar carried out with a cutting speed of about 7–16 m/s. Surface roughness, residual stress and three-dimensional surface topography are examined to characterize the surface quality. And the chip geometry parameters are measured to analyze the formation mechanism of surface topography. The result shows that cutting force and surface roughness increase rapidly with the increase in depth of cut. In the meantime, the periodic microwaves appeared on the machined surface, and their amplitudes increase with the increase in depth of cut. However, surface roughness, residual stress and microwave amplitude all decrease with the increase in cutting speed. Moreover, it is found that the evolution trend of chip thickness and surface roughness with cutting parameters is very similar. Therefore, it can be inferred that there is a strong relationship between surface topography and chip morphology.

On a Methodology for Establishing the Machine Tool System Requirements for High-Speed/High-Throughput Machining

1985 ◽  
Vol 107 (4) ◽  
pp. 316-324 ◽  
Author(s):  
R. Komanduri ◽  
J. McGee ◽  
R. A. Thompson ◽  
J. P. Covy ◽  
F. J. Truncale ◽  
...  
Keyword(s):  
Aluminum Alloys ◽  
Machine Tool ◽  
High Throughput ◽  
Machine Tools ◽  
High Speed ◽  
Cutting Speed ◽  
Tool Material ◽  
Higher Power ◽  
Increase Productivity ◽  
System Requirements

This paper presents a methodology for determining the machine tool system requirements for high-speed machining (HSM)/high-throughput machining (HTM). Both technological and economic factors should be considered in the formulation of the model for determining machine tool system requirements. The HSM function model is given here in the form of ICAM-defined (IDEFo) charts with corresponding text. For machining most aluminum alloys, the maximum cutting speed is not limited by tool life, and the technology for high-speed machine tools (spindles, table drives, controls, chip management, and other features) exists today. Therefore, HSM of aluminum alloys can be implemented. Selection of a suitable HSM system involves detailed technological analysis and economic justification for a given part-family production configuration. The recent introduction of Si3N4 based tool materials has enabled significantly higher cutting speeds (up to 1524 mpm or 5000 sfpm) in the machining of gray cast iron. However, the machine tools using this type of tool material should be more rigid and capable of higher power, higher speed, and faster feed in order to increase productivity and reduce manufacturing costs. In the machining of the difficult-to-machine materials (e.g., superalloys), the cutting speed is still limited by tool wear. Nevertheless, a high-throughput machining (HTM) strategy is pertinent for this application.

Development of Super-Hard Cutter Material

2013 ◽  
Vol 341-342 ◽  
pp. 3-7
Author(s):  
Hui Ying Feng ◽  
Xiao Jing Li
Keyword(s):  
High Speed ◽  
Cubic Boron Nitride ◽  
Tool Material ◽  
Polycrystalline Diamond ◽  
Machining Process ◽  
Main Research ◽  
High Speed Cutting ◽  
Finished Surface ◽  
Materials Used ◽  
Surface Precision

Super-hard tool material is a main research point of mechanical engineering because of excellent performance. The development of technology for high-speed cutting process could enhance the machining quality and surface precision. It is a difficulty thing to get higher finished surface for traditional machining process. However, the super-hard cutter material could enhance the finished performance of tool material. For example, the wearing resistance, high stability of PCD (polycrystalline diamond) and PCBN (poly cubic boron nitride) can get more information for obtaining higher finished surface quality. The author introduces super-hard cutters materials (PCD and PCBN) development, and discusses several material properties. The features of materials used in different cutting fields are discussed.

Experiment of Temperature Field for High Speed Orthogonal Turning

2011 ◽  
Vol 117-119 ◽  
pp. 594-597 ◽  
Author(s):  
Mu Lan Wang ◽  
Yong Feng ◽  
Xiao Xia Li ◽  
Bao Sheng Wang
Keyword(s):  
Temperature Field ◽  
High Speed ◽  
Model Simulation ◽  
Cutting Temperature ◽  
Cutting Speed ◽  
Experimental System ◽  
Maximum Temperature ◽  
Fem Model ◽  
High Speed Cutting ◽  
Orthogonal Turning

An experimental system used for temperature measurement is designed by the K-type thermocouple thermometry to achieve a direct measurement of cutting temperature in high speed orthogonal turning. The general regularity of temperature distribution is concluded, and the corresponding influences of cutting speed and cutting depth on the maximum temperature value are discussed in detail. Experimental data and simulating results are comparative analyzed to demonstrate the feasibility and correctness of Finite Element Method (FEM) model simulation and analytical solution. The verified model of temperature field can be applied to develop an effective non-contact soft-sensing method for high speed cutting temperature.

Calculating of the Temperature Distribution of Primary Shear Zone in Orthogonal High Speed Cutting Based on the Non-Uniform Volume Moving Heat Source

2009 ◽  
Vol 626-627 ◽  
pp. 105-110 ◽  
Author(s):  
Guo He Li ◽  
Min Jie Wang
Keyword(s):  
Temperature Distribution ◽  
Heat Source ◽  
Shear Zone ◽  
High Speed ◽  
Cutting Temperature ◽  
Cutting Speed ◽  
Constitutive Relationship ◽  
Moving Heat Source ◽  
High Speed Cutting ◽  
Strain And Strain Rate

A method was presented for calculating the temperature distribution of primary shear zone in orthogonal high speed cutting based on the non-uniform volume moving heat source. The temperature distribution of primary shear zone in orthogonal high speed cutting was calculated by the dynamic plastic constitutive relationship and the distribution of strain and strain rate of primary shear zone. The results show that the temperature distribution of primary shear zone is uneven, from the original plane to the cutoff plane, the cutting temperature increases continuously. In the middle of primary shear zone, the change of cutting temperature is larger, at the position near to original plant and cutoff plane, the change of cutting temperature is smaller. The cutting temperature increases with the increase of cutting speed and cutting depth, but decreases with the increase of rake angle. The comparison with existing method shows that the method presented in this paper is not only available, but also simple, convenient and more accord with the fact of orthogonal high speed cutting.

Effect of Cutting Speed on Wear Property of TiAlN PVD Coated Tools in High-Speed Milling of AISI P20 Mold Steel

2014 ◽  
Vol 621 ◽  
pp. 75-81 ◽  
Author(s):  
You Xi Lin ◽  
Hua Lin ◽  
Zhen Wei Han
Keyword(s):  
High Speed ◽  
Cutting Speed ◽  
Wear Property ◽  
High Speed Milling ◽  
High Speed Cutting ◽  
High Speeds ◽  
Coated Tools ◽  
Diffusion Wear ◽  
Aisi P20 ◽  
Important Means

High speed cutting is an important means to improve the efficiency and the quality of machining mold steel, but the tool wear is one of the key factors restricting the increase of the cutting speed, leading to higher requirements for cutting tool materials. At present the researches of high-speed cutting of mold steel are mainly on the hardness mold steel, but less on P20 mold steel which hardness is 30-42HRC. This paper mainly studies the effect of cutting speed on wear property of TiAlN PVD coated tools when high-speed milling of P20 mold steels. The experiment was conducted using two different high cutting speeds under dry condition, 320m/min and 500m/min. Wear characterization of the rake and the flank surfaces as well as the collected chips were performed using scanning electron microscopy (SEM) and energy dispersive X-ray analysis (EDX). It was found that at high speeds, the dominant wear mechanisms were oxidation wear and diffusion wear, followed by adhesive wear and melt wear; as the cutting speed increased, the wear surface area of rake face will be closer to the main cutting edge.

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