Ultra-precision grinding of hard steels

Stephenson, David; Veselovac, D.; Manley, S; Corbett, John

doi:10.1016/s0141-6359(01)00087-3

Cited by 84 publications

(55 citation statements)

References 4 publications

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“…The h min values are growing together with the growth of the cutting speed and are contained in the range of 1.1-1.8 μm. According to Bifano et al [11] and Stephenson et al [12], cutting of hard materials with the selection of uncut chip thicknesses corresponding to the h min value enables the chip formation in the ductile mode, which in turn reduces the amount of cracks and damages on the machined surface. Nevertheless, it can also lead to the excessive growth of the ploughing force and consequently the intense tool wear.…”

Section: Resultsmentioning

confidence: 99%

“…According to Bifano et al [11], the decohesion of the material in the ductile regime occurs when the selected maximum uncut chip thickness is less than the critical depth of cut that involves cracking. The research carried out by Stephenson et al [12] proved that the application of ultraprecision grinding of hardened steel in the ductile mode reduces the amount of cracks and damages on the machined surface, as well as improves its geometrical accuracy. In addition, the ductile cutting of brittle materials has been also conducted for the tools with defined geometry.…”

Section: Introductionmentioning

confidence: 99%

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The study on minimum uncut chip thickness and cutting forces during laser-assisted turning of WC/NiCr clad layers

Przestacki

Chwalczuk

Wojciechowski

2017

Int J Adv Manuf Technol

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Laser cladding technology enables the regeneration or manufacturing of machine parts with the improved surface layer properties. The materials applied during the laser cladding processes very often contain hard and wear-resistant tungsten carbide (WC) particles. However, the parts obtained after the laser cladding have usually unsatisfactory surface quality and thus require post-process finishing. In addition, the content of WC particles causes that clad layers are difficult to cut. Therefore, in order to improve their machinability, the laser-assisted machining (LAM) technology can be applied. Nevertheless, the material removal mechanisms during LAM of WC/NiCr clad layers are not recognized. Thus, this study is focused on the estimation of minimum uncut chip thickness and analysis of cutting forces which are important factors describing the chip decohesion process. The proposed method is based on the novel approach dedicated directly to the oblique cutting, considering the zeroth tangential force increment located onto rounded cutting edge. The experimental procedure involves cutting force component (F c , F f , F p ) measurements in the range of variable cutting conditions, as well as the cutting tool's micro-geometry inspection. On the basis of the measurements carried out, the force regression equations are formulated and subsequently applied to the determination of tangential force expression. Subsequently, the minimum uncut chip thickness is calculated on the basis of the equation derived from the zero tangential force increment condition and presented in function of cutting speed. The obtained results enable the effective selection of the cutting parameters during LAM of WC/NiCr clad layers.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

The study on minimum uncut chip thickness and cutting forces during laser-assisted turning of WC/NiCr clad layers

Przestacki

Chwalczuk

Wojciechowski

2017

Int J Adv Manuf Technol

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“…Recently, ultraprecision grinding has been developed that substantially decreases subsurface damage and can precisely control the geometry of the finished surface [11,12]. This kind of process is conducted on the ultraprecision CNC grinding machines, with threeaxes movements, and micro-system to deterministically generate, fine, and pre-polish a plano or spherical surface.…”

Section: Machining Of Tungsten Carbidementioning

confidence: 99%

Machining Characteristics of Direct Laser Deposited Tungsten Carbide

Twardowski¹,

Wojciechowski²

2012

Tungsten Carbide - Processing and Applications

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“…Recently a novel tetrahedron structure proposed by the NPL in England has been applied in an ultraprecision grinding machine -Tetraform C. It utilizes an internally damped space frame with all the loads carried in closed loop. The design generates a very high static stiffness coupled with exceptional dynamic stiffness [6].…”

Section: • Structural Configurationmentioning

confidence: 99%

Design of ultraprecision machine tools with applications to manufacture of miniature and micro components

Luo

Cheng

Webb

et al. 2005

Journal of Materials Processing Technology

138

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Currently the underlying necessities for predictability, producibility and productivity remain big issues in ultraprecision machining of miniature/microproducts. The demand on rapid and economic fabrication of miniature/microproducts with complex shapes has also made new challenges for ultraprecision machine tool design. In this paper the design for an ultraprecision machine tool is introduced by describing its key machine elements and machine tool design procedures. The focus is on the review and assessment of the state-of-the-art ultraprecision machining tools. It also illustrates the application promise of miniature/microproducts. The trends on machine tool development, tooling, workpiece material and machining processes are pointed out.

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Ultra-precision grinding of hard steels

Cited by 84 publications

References 4 publications

The study on minimum uncut chip thickness and cutting forces during laser-assisted turning of WC/NiCr clad layers

The study on minimum uncut chip thickness and cutting forces during laser-assisted turning of WC/NiCr clad layers

Machining Characteristics of Direct Laser Deposited Tungsten Carbide

Design of ultraprecision machine tools with applications to manufacture of miniature and micro components

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