A study of grinding silicon nitride and cemented carbide materials with diamond grinding wheels

Biermann, Dirk; Würz, Evelyn

doi:10.1007/s11740-009-0183-z

Cited by 18 publications

(3 citation statements)

References 7 publications

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“…The Knoop hardness of PCD is given with 50 GPa and thereby reaches almost the range of diamond with 57 -104 GPa, but as an advantage for some applications it is isotropic as a result from the sintering process [10]. The grinding process of hard and brittle materials, which is mostly machined with diamond wheels, can be characterized by low material removal rates and extremely high values for the grinding wheel wear [11]. Industrial applications address values between G = 0.01 -0.05 for the grinding ratio [12,13].…”

Section: Grinding Of Pcdmentioning

confidence: 99%

Finishing of polycrystalline diamond tools by combining laser ablation with grinding

Brecher

Klocke

Schindler

et al. 2013

Prod. Eng. Res. Devel.

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In manufacturing polycrystalline diamond (PCD) tools, the finishing process in order to obtain the required surface and edge quality and to remove the damaged PCD layer induced by the prior manufacturing steps is mostly done by grinding. However, grinding is currently inefficient and costly due to low material removal rates and high wear of the grinding wheel. The project "Pro-PKD" aims to increase throughput and reduce tool wear by an additional laser ablation step prior to grinding. In first process investigations, the influence of different laser parameters on the ablation rate was analyzed and an optimum parameter set for maximum ablation efficiency was found. By measuring the overall material removal from the grinding wheel and the PCD tool, it could be shown that the G-ratio can be increased by at least a factor of two. Furthermore, the time required for grinding can be significantly shortened. As the time needed for laser ablation is only several seconds, in this way the whole time required for the finishing process can be reduced. In any case, the combined process presented here has the distinct advantage that it can be implemented into already existing grinding machines with comparatively low investment costs

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Section: Grinding Of Pcdmentioning

confidence: 99%

Finishing of polycrystalline diamond tools by combining laser ablation with grinding

Brecher

Klocke

Schindler

et al. 2013

Prod. Eng. Res. Devel.

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“…This technique is especially useful when cylindrical, curved or other complex surfaces with high surface quality is needed. Various researchers have been studying Si 3 N 4 grinding [16,17]. Stolarski et al [18] have investigated amount of loading and abrasive grain size in the grinding operation of Si 3 N 4 ceramics.…”

Section: Introductionmentioning

confidence: 99%

Investigation on rotary ultrasonic assisted end grinding of silicon nitride ceramics

Baraheni

Amini

2019

SN Appl. Sci.

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In this study, rotary ultrasonic assisted end grinding (RUAEG) of silicon nitride (Si 3 N 4) was discussed. In addition, comparison of RUAEG with conventional end grinding was carried out. Machining parameters effect on the process was experimentally and statistically distinguished. Moreover, interaction of the influential parameters was discussed and the optimum condition was obtained. It is concluded from interaction plots that ultrasonic vibration influence on surface roughness was greater in lower cutting depths and higher rotational speeds. Moreover, by RUAEG process, it could acquire higher material removal speed with lower thrust force. Exerting ultrasonic vibration on the tool was more influential comparing to other grinding parameters. From morphological examinations, that was concluded RUAEG of ceramics results in lower amount of scratches, diminishing grinding lines and smoothing the surface due to be knocked continuously by the tool.

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“…In comparison to conventional cutting materials, the usage of PCD tools leads to higher chip removal rates and lower tool wear [2]. For some applications, PCD tools have a notable longer tool life than cemented carbide tools [3] or silicon nitride tools [4]. In addition, economical machining of highly abrasive materials is often only possible with PCD tools [5].…”

Section: Introductionmentioning

confidence: 99%

Analysis of the Tribological Conditions in Grinding of Polycrystalline Diamond Based on Single Grain Friction Tests Using the Pin-Disk Principle

Vits

Trauth

Mattfeld

et al. 2018

KEM

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Cutting tools made of polycrystalline diamond (PCD) are used for machining of aluminum alloys, fiber-reinforced plastic composites and wood. Compared to cemented carbide tools with geometrically defined cutting edges, PCD tools offer significant advantages with respect to tool life. High demands regarding the cutting edge roughness and the quality of the rake and the flank face usually require a grinding process with diamond grinding wheels. The PCD grinding process, however, is characterized by low material removal rates and high grinding wheel wear. The material removal rate and the grinding wheel wear, in turn, highly depend on the process state variables process force and process temperature. However, the relationship between these process state variables and the process input variables is largely unknown. This work provides a contribution to the closure of this knowledge gap by means of an adapted friction law. A single grain friction test stand using the pin-disk principle was developed, which enables a measurement of the friction force and the contact zone temperature for normal forces and relative speeds that are common in PCD grinding. During the experiments, the specification of the PCD disc, the cross-sectional area of the friction sample made of monocrystalline diamond as well as the process parameters normal force and relative speed were varied. In addition, the tests were carried out without lubrication as well as with a minimum lubrication. A high correlation between the contact force and the coefficient of friction was determined. This relationship was mathematically formulated in a friction law. In addition, a direct influence of the contact force and the relative velocity on the contact zone temperature was identified. The knowledge gained leads to an improved understanding of the PCD grinding process and thus enables a more efficient grinding process design.

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A study of grinding silicon nitride and cemented carbide materials with diamond grinding wheels

Cited by 18 publications

References 7 publications

Finishing of polycrystalline diamond tools by combining laser ablation with grinding

Finishing of polycrystalline diamond tools by combining laser ablation with grinding

Investigation on rotary ultrasonic assisted end grinding of silicon nitride ceramics

Analysis of the Tribological Conditions in Grinding of Polycrystalline Diamond Based on Single Grain Friction Tests Using the Pin-Disk Principle

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