Experimental Investigations into Machining of FRP Material

2016 ◽  
Vol 836-837 ◽  
pp. 29-35
Author(s):  
Pavel Zeman ◽  
Petr Kolar ◽  
Petr Masek
Keyword(s):  
Surface Quality ◽  
Cutting Forces ◽  
Cutting Tool ◽  
Cutting Tools ◽  
Cellulose Fibre ◽  
Experimental Investigations ◽  
Tool Geometry ◽  
Machined Surface ◽  
Milling Operations ◽  
Machined Surface Quality

Machining of fibre-reinforced thermosets is becoming a very popular technology today. Nevertheless, machinability of these materials is rather different from conventional materials such as metals since hard and abrasive fibres are combined with relatively soft resin with low glass transition temperature. Special attention has to be given to workpiece quality because delamination and burning of machined surface can occur. An experimental investigation into machinability of a polymeric and cellulose fibre-reinforced resin material was carried out. Milling operations were inspected with respect to process temperature, cutting forces and machined surface quality. The effect of cutting conditions on the mentioned aspects was determined. Standard and tailored cutting tools were used in the investigation. It was observed that surface quality is strongly dependent on tool geometry, milling strategy, fibre orientation and feed. On the other hand, cutting forces are relatively low and dependent on tool geometry and feed. The modified cutting tool with more positive tool geometry showed better results compared to the conventional one.

Study on the Cutting Force and Machined Surface Quality of Milling AFRP

2016 ◽  
Vol 836-837 ◽  
pp. 155-160 ◽  
Author(s):  
Si Qi Liu ◽  
Yan Chen ◽  
Yu Can Fu ◽  
An Dong Hu
Keyword(s):  
Cutting Force ◽  
Surface Quality ◽  
Cutting Tool ◽  
Cutting Tools ◽  
Cutting Parameters ◽  
Helix Angle ◽  
End Mill ◽  
Machined Surface ◽  
Reinforced Plastics ◽  
Machined Surface Quality

AFRP(Aramid Fiber Reinforced Plastics) is widely used in the aerospace and automotive while there are many problems in machining AFRP such as furry, delamination, burns and so on. Milling experiments of AFRP have been conducted to study the influence of different helix angle (0°, 30°, 60°) and cutting tools (traditional end mill, multiple flute end mill and compression end mill) on cutting force and machined surface quality. The results indicated that the cutting force has been reduced and the surface quality has been improved with the increase of helix angle. The cutting tool structure can make greater influence on machined surface quality than the cutting parameters. A cutting tool with the structure of multiple flute or herringbone cutting edge could reduce the axial cutting force. However the cutting force is too small to cut off fibers when using a multiple flute end mill. A good processing surface can be achieved while cutting with a compression end mill or a tool with big helix angle.

The Effect of the Cutting Parameters on the Machined Surface Roughness

2017 ◽  
Vol 260 ◽  
pp. 219-226 ◽  
Author(s):  
Viktors Gutakovskis ◽  
Eriks Gerins ◽  
Janis Rudzitis ◽  
Artis Kromanis
Keyword(s):  
Surface Roughness ◽  
Metal Cutting ◽  
Cutting Tool ◽  
Cutting Tools ◽  
Cutting Parameters ◽  
Cutting Process ◽  
Tool Geometry ◽  
Machining Parameters ◽  
Machined Surface ◽  
Machined Surface Roughness

From the invention of turning machine or lathe, some engineers are trying to increase the turning productivity. The increase of productivity is following after the breakout in instrumental area, such as the hard alloy instrument and resistance to wear cutting surfaces. The potential of cutting speed has a certain limit. New steel marks and cutting surfaces types allow significantly increase cutting and turning speeds. For the most operation types the productivity increase begins from the feeding increase. But the increase of feeding goes together with machined surface result decreasement. Metal cutting with high feeding is one of the most actual problems in the increasing of manufacturing volume but there are some problems one of them is the cutting forces increasement and larger metal removal rate, which decrease the cutting tool life significantly. Increasing of manufacturing volume, going together with the cutting instrument technology and material evolution, such as the invention of the carbide cutting materials and wear resistant coatings such as TiC and Ti(C,N). Each of these coating have its own properties and functions in the metal cutting process. Together with this evolution the cutting tool geometry and machining parameters dependencies are researched. Traditionally for the decreasing the machining time of one part, the cutting parameters were increased, decreasing by this way the machining operation quantity. In our days the wear resistance of the cutting tools increasing and it is mostly used one or two machining operations (medium and fine finishing). The purpose of the topic is to represent the experimental results of the stainless steel turning process, using increased cutting speeds and feeding values, to develop advanced processing technology, using new modern coated cutting tools by CVD and PVD methods. After investigation of the machined surface roughness results, develop the mathematical model of the cutting process using higher values of the cutting parameters.

scholarly journals Spectral Properties of Milling and Machined Surface

2016 ◽  
Vol 836-837 ◽  
pp. 570-577 ◽  
Author(s):  
Gabor Stepan ◽  
Mate Toth ◽  
Daniel Bachrathy ◽  
Suri Ganeriwala
Keyword(s):  
Surface Quality ◽  
Spectral Properties ◽  
Cutting Tools ◽  
Milling Process ◽  
Machined Surface ◽  
Industrial Case Study ◽  
Machined Surface Quality ◽  
Negative Effect

Machine tool vibrations cause uncomfortable noise, may damage the edges of cutting tools or certain parts of machine tools, but most importantly, they always have negative effect on the quality of the machined surface of workpieces. These vibrations are especially intricate in case of milling processes where complex tool geometries are used, like helical, serrated, non-uniform pitch angles, and so on. During the milling process, the arising vibrations include free, forced, self-excited, and even parametrically forced vibrations together with their different combinations. Regarding surface quality, the most harmful is the self-excited one called chatter, which is related to the regenerative effect of the cutting process. Its relation to machined surface quality is demonstrated in an industrial case study. The modelling and the corresponding cutting stability are presented in case of a helical tool applied for milling with large axial immersions. The extremely rich spectrum of the measured vibration signals are analyzed by means of model-based predictions, and the results are compared with the spectral properties of the corresponding machined surfaces. The conclusions open the way for new kinds of chatter identification.

scholarly journals Highly Productive Tools For Turning And Milling

2015 ◽  
Vol 12 (2) ◽  
pp. 5-9
Author(s):  
Karol Vasilko
Keyword(s):  
Cutting Tool ◽  
Cutting Tools ◽  
Cutting Speed ◽  
Considerable Influence ◽  
Machined Surface ◽  
Machined Surface Quality ◽  
Surface Microgeometry ◽  
Tip Radius ◽  
Machining Productivity ◽  
The Relationship

Abstract Beside cutting speed, shift is another important parameter of machining. Its considerable influence is shown mainly in the workpiece machined surface microgeometry. In practice, mainly its combination with the radius of cutting tool tip rounding is used. Options to further increase machining productivity and machined surface quality are hidden in this approach. The paper presents variations of the design of productive cutting tools for lathe work and milling on the base of the use of the laws of the relationship among the highest reached uneveness of machined surface, tool tip radius and shift.

Research Progress of High Speed Cutting for SiCp_Al Composite Materials

2014 ◽  
Vol 800-801 ◽  
pp. 3-8
Author(s):  
Yang Bai ◽  
Pei Quan Guo ◽  
Ning Fan
Keyword(s):  
Composite Materials ◽  
Tool Wear ◽  
Surface Quality ◽  
High Speed ◽  
Surface Defects ◽  
Cutting Tools ◽  
Research Progress ◽  
Machined Surface ◽  
High Speed Cutting ◽  
Machined Surface Quality

Summarized the research and development of high speed machining of SiCp/Al composites. Emphasized the research status of high speed cutting of SiCp/Al composite materials, including machined surface quality and tool wear condition. Machined surface quality contains surface roughness and surface defects. The tool wear conditions are different because of different types of cutting tools, but the wear of the rake face, the rear face and the cutting edge are all involved.

scholarly journals Effect of Shift in Speed Turning on Machined Surface Quality

2017 ◽  
Vol 65 (1) ◽  
pp. 135-143
Author(s):  
Pavel Polák ◽  
Petr Dostál ◽  
Katarína Kollárová
Keyword(s):  
Mild Steel ◽  
Surface Quality ◽  
Cutting Tool ◽  
Hardened Steel ◽  
Cutting Conditions ◽  
Machined Surface ◽  
Machined Surface Quality ◽  
The Given ◽  
Machined Surfaces ◽  
Thermally Treated

This article describes the evaluation of machined material roughness in speed turning on a machining centre Doosan Puma 700 LY. The machined surface of semi-finished products from steel 14 260 was compared at selected cutting conditions. A half of compared samples from steel 14 260 was in the original, thermally untreated condition (mild steel), and the second half of samples was thermally treated (hardened steel, with a hardness of samples 50 HRC). The experiment focused on turning the selected samples in order to evaluate the roughness of machined surfaces. Cutting tool shift was variable during individual measurements. This experiment contributes to a quick orientation in the given issue and points out to optimisation of cutting conditions.

New Ways in Aluminium Alloys Grinding

2011 ◽  
Vol 496 ◽  
pp. 132-137 ◽  
Author(s):  
Martin Novák ◽  
Natasa Naprstkova ◽  
Ludek Ruzicka
Keyword(s):  
Surface Quality ◽  
Production Technology ◽  
Automotive Industry ◽  
Aluminium Alloys ◽  
Machined Surface ◽  
Milling Operations ◽  
Machined Surface Quality ◽  
Cutting Operation ◽  
Traditional Process

This paper deals with new possibilities in aluminium alloys grinding. Presently the aluminium alloys have forceful usage in engineering. The using of aluminium alloys we can find in general engineering, automotive industry, cosmonautics, aeronautics and medicine. Wide possibilities of the aluminium alloys using is very important area for production technology too. The traditional process of aluminium alloys is e. g. forming, pressing. In cutting operation is it especially turning and milling operations. Grinding like finishing method of machining is not so used for aluminium alloys machining. This method not doing optimal results in touch with these materials of machined surface quality. This paper shows new ways and possibilities in aluminium alloys grinding.

scholarly journals Atomistic Simulation Study of Nanoparticle Effect on Nano-Cutting Mechanisms of Single-Crystalline Materials

Micromachines ◽  
2020 ◽  
Vol 11 (3) ◽  
pp. 265 ◽  
Author(s):  
Pengyue Zhao ◽  
Qi Zhang ◽  
Yongbo Guo ◽  
Huan Liu ◽  
Zongquan Deng
Keyword(s):  
Plastic Deformation ◽  
Surface Quality ◽  
Cutting Tool ◽  
Deformation Mechanisms ◽  
Relative Depth ◽  
Machined Surface ◽  
Workpiece Surface ◽  
Single Crystalline ◽  
Machined Surface Quality ◽  
Cutting Mechanisms

Nanoparticle (NP), as a kind of hard-to-machine component in nanofabrication processes, dramatically affects the machined surface quality in nano-cutting. However, the surface/subsurface generation and the plastic deformation mechanisms of the workpiece still remain elusive. Here, the nano-cutting of a single-crystalline copper workpiece with a single spherical embedded nanoparticle is explored using molecular dynamics (MD) simulations. Four kinds of surface/subsurface cases of nanoparticle configuration are revealed, including being removed from the workpiece surface, moving as a part of the cutting tool, being pressed into the workpiece surface, and not interacting with the cutting tool, corresponding to four kinds of relative depth ranges between the center of the nanoparticle and the cutting tool. Significantly different plastic deformation mechanisms and machined surface qualities of the machined workpiece are also observed, suggesting that the machined surface quality could be improved by adjusting the cutting depth, which results in a change of the relative depth. In addition, the nanoparticle also significantly affects the processing forces in nano-cutting, especially when the cutting tool strongly interacts with the nanoparticle edge.

scholarly journals Wear of Cutting Tool with Excel Geometry in Turning Process of Hardened Steel

2016 ◽  
Vol 24 (38) ◽  
pp. 95-102
Author(s):  
Michaela Samardžiová
Keyword(s):  
Hard Turning ◽  
Cutting Tool ◽  
Materials Science ◽  
Cutting Tools ◽  
Hardened Steel ◽  
Tool Geometry ◽  
Turning Process ◽  
Workpiece Material ◽  
Machined Surface ◽  
Centre Of Excellence

Abstract This paper deals with hard turning using a cutting tool with Xcel geometry. This is one of the new geometries, and there is not any information about Xcel wear in comparison to the conventional geometry. It is already known from cutting tools producers that using the Xcel geometry leads to higher quality of machined surface, perticularly surface roughness. It is possible to achieve more than 4 times lower Ra and Rz values after turning than after using conventional geometry with radius. The workpiece material was 100Cr6 hardened steel with hardness of 60 ± 1 HRC. The machine used for the experiment was a lathe with counter spindle DMG CTX alpha 500, which is located in the Centre of Excellence of 5–axis Machining at the Faculty of Materials Science and Technology in Trnava. The cutting tools made by CBN were obtained from Sandvik COROMANT Company. The aim of this paper is to investigate the cutting tool wear in hard turning process by the Xcel cutting tool geometry.

scholarly journals Effect of Coating and Polishing of Cutting Tool on Machined Surface Quality in Dry Machining of Aluminium Alloy

2020 ◽  
Vol 70 (3) ◽  
pp. 299-305
Author(s):  
Atul Dev ◽  
Smriti Tandon ◽  
Pankaj Kumar ◽  
Anup Dutt
Keyword(s):  
Aluminium Alloy ◽  
Surface Quality ◽  
Surface Finish ◽  
Cutting Tool ◽  
Machining Process ◽  
Dry Machining ◽  
Machined Surface ◽  
Machined Surface Quality ◽  
Flute Surface ◽  
Machining Parameter

Surface quality is one of the major concerns in any machining process. To achieve the higher surface finish, mostly concentrated on machining parameter optimisation. This study has been carried out to study the effect of coating and polishing of flute surface of the solid carbide (WC-Co) endmill cutters on machined surface quality obtained during dry machining of Aluminium alloy 24345WP. Experiments were conducted on Aluminum workpieces with Ø6 mm 2 flute end- mill cutter with and without coating/polishing and their effect on surface quality studied for linear as well as areal surface roughness parameters using white light interferometery. The study concludes that polished flute tool, despite their non-sharp cutting edges, gives considerably better surface finish due to its lowering of chip tool friction. This was also supported by the results obtained from scanning electron microscopy of the cutting tool edge as well as optical microscopy of the obtained machined surface.

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