scholarly journals Influence of Cemented Carbide Composition on Cutting Temperatures and Corresponding Hot Hardnesses

Materials ◽  
2020 ◽  
Vol 13 (20) ◽  
pp. 4571
Author(s):  
Anne Vornberger ◽  
Tobias Picker ◽  
Johannes Pötschke ◽  
Mathias Herrmann ◽  
Berend Denkena ◽  
...  
Keyword(s):  
Thermal Conductivity ◽  
Tool Wear ◽  
Room Temperature ◽  
Metal Cutting ◽  
Cutting Temperature ◽  
Cutting Parameters ◽  
Cutting Edge ◽  
Cemented Carbide ◽  
Tungsten Carbides ◽  
Cemented Carbide Tool

During metal cutting, high temperatures of several hundred-degree Celsius occur locally at the cutting edge, which greatly impacts tool wear and life. Not only the cutting parameters, but also the tool material’s properties influence the arising cutting temperature which in turn alters the mechanical properties of the tool. In this study, the hardness and thermal conductivity of cemented tungsten carbides were investigated in the range between room temperature and 1000 °C. The occurring temperatures close to the cutting edge were measured with two color pyrometry. The interactions between cemented carbide tool properties and cutting process parameters, including cutting edge rounding, are discussed. The results show that cemented carbides with higher thermal conductivities lead to lower temperatures during cutting. As a result, the effective hardness at the cutting edge can be strongly influenced by the thermal conductivity. The differences in hardness measured at room temperature can be equalized or evened out depending on the combination of hardness and thermal conductivity. This in turn has a direct influence on tool wear. Wear is also influenced by the softening of the workpiece, so that higher cutting temperatures can lead to less wear despite the same effective hardness.

Cutting Performance of Cemented Carbide Tool in High-Efficiency Turning Ti6Al4V

2012 ◽  
Vol 522 ◽  
pp. 231-235 ◽  
Author(s):  
Yi Hang Fan ◽  
Min Li Zheng ◽  
Zhe Li ◽  
Song Tao Wang ◽  
Ying Bin Li
Keyword(s):  
Titanium Alloy ◽  
Tool Wear ◽  
Cutting Force ◽  
Tool Life ◽  
Cutting Temperature ◽  
Cutting Performance ◽  
Cemented Carbide ◽  
Carbide Tool ◽  
Cemented Carbide Tool ◽  
Coated Carbide

The machining efficiency of titanium alloy Ti6Al4V is low and the tool wear is serious. In this paper, uncoated carbide tool and two kinds of coated cemented carbide tool were used for dry turning titanium alloy. The experiments used CCD Observing System and the EDAX analysis of SEM to study tool wear mechanism and analyze the cutting performance through tool life, cutting force and cutting temperature. The results show that the main wear reasons are adhesion, diffusion and oxidation wear. For coated tool, the coating peeled off first, and then tool substrate damaged. Compared with coated carbide tool, the uncoated carbide tool with fine grain has longer tool life and lower cutting force and cutting temperature. The changes of cutting force and cutting temperature with cutting speed are not obvious when using the ccomposite coating (TiAlN and AlCrN) carbide tool. The results can help to choose tool material reasonably and control tool wear.

Research Status of Subsequent Machining of Laser Cladding Layers

2020 ◽  
Vol 15 ◽  
Author(s):  
Lei Li ◽  
Yujun Cai ◽  
Guohe Li ◽  
Meng Liu
Keyword(s):  
Tool Wear ◽  
Surface Quality ◽  
Laser Cladding ◽  
Wear Surface ◽  
Chip Formation ◽  
Cutting Temperature ◽  
Dimensional Accuracy ◽  
Cutting Parameters ◽  
Cladding Layer ◽  
Cladding Layers

Background: As an important method of remanufacturing, laser cladding can be used to obtain the parts with specific shapes by stacking materials layer by layer. The formation mechanism of laser cladding determines the “Staircase effect”, which makes the surface quality can hardly meet the dimensional accuracy of the parts. Therefore, the subsequent machining must be performed to improve the dimensional accuracy and surface quality of cladding parts. Methods: In this paper, chip formation, cutting force, cutting temperature, tool wear, surface quality, and optimization of cutting parameters in the subsequent cutting of laser cladding layer are analyzed. Scholars have expounded and studied these five aspects but the cutting mechanism of laser cladding need further research. Results: The characteristics of cladding layer are similar to that of difficult to machine materials, and the change of parameters has a significant impact on the cutting performance. Conclusion: The research status of subsequent machining of cladding layers is summarized, mainly from the aspects of chip formation, cutting force, cutting temperature, tool wear, surface quality, and cutting parameters optimization. Besides, the existing problems and further developments of subsequent machining of cladding layers are pointed out. The efforts are helpful to promote the development and application of laser cladding remanufacturing technology.

Temperature Field Numerical Analysis of Machining Process Based on the Finite Element Analysis

2014 ◽  
Vol 621 ◽  
pp. 611-616 ◽  
Author(s):  
Yan Juan Hu ◽  
Yao Wang ◽  
Zhan Li Wang
Keyword(s):  
Finite Element ◽  
Temperature Field ◽  
Metal Cutting ◽  
Orthogonal Cutting ◽  
Cutting Temperature ◽  
Cutting Parameters ◽  
Element Model ◽  
Machining Process ◽  
Element Analysis ◽  
Mechanical Coupling

In order to study the temperature field distribution in the process of machining, the finite element theory was used to establish the orthogonal cutting finite element model, and the key technologies were discussed simultaneously. By using ABAQUS software for cutting AISI1045 steel temperature field of numerical simulation, the conclusion about changing rule of cutting temperature field can be gotten. The results show that this method can efficiently simulate the distribution of temperature field of the workpiece, cutter and scraps, which is effected by thermo-mechanical coupling in metal work process. It provides the theory evidence for the intensive study of metal-cutting principle, optimizing cutting parameters and improving processing technic and so on.

Vibration Polishing Edge Preparation for Cemented Carbide Inserts

2012 ◽  
Vol 201-202 ◽  
pp. 1174-1177
Author(s):  
Jiao Wang ◽  
Hao Wang ◽  
Ai Bing Yu
Keyword(s):  
Cutting Tools ◽  
Abrasive Particle ◽  
Optical Microscope ◽  
Cutting Edge ◽  
Cemented Carbide ◽  
Abrasive Particles ◽  
Cemented Carbide Tool ◽  
Carbide Inserts ◽  
Edge Preparation ◽  
Cemented Carbide Inserts

Micro-cracks on cutting edge will cause early breakages on cutting tools, accelerate tool wear and reduce cemented carbide tool life. Edge preparation can improve the cutting edge quality. Vibration polishing experiments were carried out for cemented carbide inserts edge preparation. Inserts and fixtures were put into the vibration polishing equipment which forced abrasive particles to collide and polish inserts. Edge preparation for fixed type insert and free type insert were compared with three sizes of abrasive particles. And the polishing time was changed for each testing cases. Experiments were carried out by altering polishing time, abrasive particle size and tool clamping way to determine the optimum technology of vibration polishing edge preparation. The experimental results showed that edge breakage numbers of insert significantly reduced. Smooth and round cutting edges were observed by optical microscope after edge preparation. Edge preparation experiments prove that edge preparation can change the cutting edge geometry and improve the cutting tool quality.

Tool Wear of Diamond Tools in Ultrasonic Vibration Turning Titanium Alloys

2012 ◽  
Vol 229-231 ◽  
pp. 517-520 ◽  
Author(s):  
Zhi Min Zhou ◽  
Xiao Yan Li ◽  
Yuan Xin Qu ◽  
Jian Na
Keyword(s):  
Tool Wear ◽  
Titanium Alloys ◽  
Ultrasonic Vibration ◽  
Diamond Tool ◽  
Cutting Temperature ◽  
Cutting Parameters ◽  
Turning Process ◽  
Diamond Tools ◽  
Tc4 Titanium Alloy ◽  
Superior Mechanical Properties

Titanium alloys, as difficult-to-cut materials, have poor machinability due to their superior mechanical properties, heat resistance and corrosion resistance. High cutting temperature and great cutting force that will greatly accelerate tool wear often occurs in titanium alloys cutting process. In this paper, an ultrasonic vibration turning method was used to lower diamond tool wear during TC4 titanium alloy turning process. Ultrasonic vibration turning tests were carried out with various cutting parameters. Experimental results indicated that there’s a significant reduction of the wear rate of diamond tools by means of ultrasonic vibration in TC4 turning process. For ultrasonic vibration turning, spindle speed, the amplitude and frequency of vibration of the tool are the greatest impact of tool wear, followed by feed rate, then the cutting depth.

scholarly journals Experimental Investigation On Machining Performance During Orbital Drilling of CFRP

2021 ◽  
Author(s):  
Linghao Kong ◽  
Dong Gao ◽  
Yong Lu ◽  
Pengfei Zhang
Keyword(s):  
Tool Wear ◽  
Thrust Force ◽  
Cutting Temperature ◽  
Cutting Parameters ◽  
Machining Performance ◽  
Machining Quality ◽  
Orbital Drilling ◽  
Orthogonal Experiments ◽  
Hole Making ◽  
Tool Diameter

Abstract As the most promising CFRP hole making method, orbital drilling is widely concerned. This paper aims to understand the influence of the cutting parameters, tool diameters and ratio between milling and drilling (Rm&d) on thrust force, cutting temperature, tool wear and machining quality in CFRP orbital drilling. The effects of cutting parameters on thrust force and cutting temperature were studied by orthogonal experiments, and experiments were performed to investigate the variations of tool diameters, ratio between drilling and milling on thrust force, cutting temperature, tool wear and machining quality. The experimental results show that the tangential feed rate has no apparent effects on thrust force, but it appreciably impacts on the cutting temperature. The selection of tool diameter and the Rm&d has specific influence on tool wear, machining quality and cutting temperature. The result is helpful for selecting cutting parameters and tool diameters for high quality holes machining in CFRP orbital drilling.

Hot Milling: A Proposal to Minimize Thermal Cracks Formation in Cemented Carbide Tools

2013 ◽  
Author(s):  
Ramsés Otto Cunha Lima ◽  
Anderson Clayton Alves de Melo
Keyword(s):  
Tool Wear ◽  
Room Temperature ◽  
Thermal Loading ◽  
Cemented Carbide ◽  
Cutting Fluid ◽  
Milling Cutter ◽  
Thermal Cracks ◽  
Hot Air ◽  
1045 Steel ◽  
Coated Cemented Carbide

It is well known that milling is a rotating and interrupted cutting process in which the milling cutter is made up of a number of inserts placed around its body and that each insert has the function of removing an amount of material from the workpiece per revolution. This feature induces the cyclic thermal loading in the cutting tool edge leading the insert to thermal fatigue, which induces nucleation and propagation of thermal cracks and accelerates the process of tool wear. This paper proposes a method to minimize this thermal cycling effect. In this case, hot air was blown into the idle phase of the milling cutter during face milling of an AISI 1045 steel with coated cemented carbide inserts. The main goal was to make the process quasi-continuous from the thermal viewpoint. Trials were carried out dry, at room temperature and with hot air applied at 100, 350 and 580°C, and wet at room temperature and 580°C. In this last case, an MQL (Minimum Quantity of Lubricant) system was used to create a spray of cutting fluid. After milling trials, the inserts were taken to a scanning electron microscope where the number of thermal cracks, wear and other damage was analyzed. It was observed that the heating of the idle phase helped reducing the number of thermal cracks and tool wear.

Study on Cutting Temperature Modeling of Machined Workpiece in End Milling In-Situ TiB2/7050Al MMCs

2018 ◽  
Author(s):  
Yifeng Xiong ◽  
Wenhu Wang ◽  
Ruisong Jiang ◽  
Kunyang Lin
Keyword(s):  
Heat Source ◽  
Metal Cutting ◽  
End Milling ◽  
Great Influence ◽  
Cutting Temperature ◽  
Cutting Edge ◽  
Temperature Model ◽  
Machined Surface ◽  
Temperature Modeling

During metal cutting, it is well known that the cutting temperature has great influence on the machined surface integrity, especially on the residual stress and machining defects. At present, a lot of analytical modeling work has been done on the cutting temperature of tool, chips and workpiece machined by the side cutting edge during end milling process. To the workpiece surface machined by the bottom cutting edge, the study of temperature modeling is rarely reported. Besides, as a new kind of particulate metal matrix composites (MMCs) with improved mechanical and physical properties, the machining study of in-situ TiB2/7050Al MMCs is not many and no analytical temperature modeling of MMCs has been published up to now. Our study aims to establish an analytical cutting temperature model of workpiece machined by the bottom cutting edge in end milling in-situ TiB2/7050Al MMCs. In this model, the moving heat source method was applied. To meet the actual cutting process, the effect of heating time was also taken into account. With validation, the temperature model shows good agreement with experimental results. It was found that the heat partition ratio conducted from the shear plane heat source to the workpiece increased linearly as thermal number increased, due to the influence of increasing heat conducted into chip by the side cutting edge. The proposed cutting temperature model was of great significance for both the temperature modeling work of end milling and study of Al-MMCs.

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