Experimental Research of Cutting Performance and Quality Abilities of Modern Drilling Tools

Palásti-Kovács, Béla; Sipos, Sándor; Szalóki, István

doi:10.4028/www.scientific.net/kem.581.32

Cited by 7 publications

(8 citation statements)

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“…The ratio of mean roughness depth to the average surface roughness ( R z / R a ) is a combined roughness parameter, which can characterise non-conventional machined surfaces. 42–46 The value of this combined parameter is about 4-7 in conventional sizes. 43,44 This ratio was also investigated, because it related to the defects of the surface (e.g.…”

Section: Resultsmentioning

confidence: 99%

“…42–46 The value of this combined parameter is about 4-7 in conventional sizes. 43,44 This ratio was also investigated, because it related to the defects of the surface (e.g. material smears, material debris, dislodging grains) and in relation with the tribological behaviour of the machined surface, which could be important in the case of micro-injection moulding tools.…”

Section: Resultsmentioning

confidence: 99%

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Experimental investigation of the influence of cutting parameters on surface quality and on the special characteristics of micro-milled surfaces of hardened steels

Balázs

Takács

2021

Proceedings of the Institution of Mechanical Engineers, Part C:

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Micro-milling is one of the most essential technologies to produce micro components, but due to the size effect, it has many special characteristics and challenges. The process can be characterised by strong vibrations, relatively large run-out and tool deformation, which directly affects the quality of the machined surface. This paper deals with a detailed investigation of the influence of cutting parameters on surface roughness and on the special characteristics of micro-milled surfaces. Several systematic series of experiments were carried out and analysed in detail. A five-axis micromachining centre and a two fluted, coated carbide micro-milling tool with a diameter of 500 µm were used for the tests. The experiments were conducted on AISI H13 hot-work tool steel and Böhler M303 martensitic corrosion resistance steel with a hardness of 50 HRC in order to gain relevant information of machining characteristics of potential materials of micro-injection moulding tools. The effect of the cutting parameters on the surface quality and on the ratio of Rz/ Ra was investigated in a comprehensive cutting parameter range. ANOVA was used for the statistical evaluation. A novel method is presented, which allows a detailed analysis of the surface profile and repetitions, and identify the frequencies that create the characteristic profile of the surface. The procedure establishes a connection between the frequencies obtained during the analysis of dynamics (forces, vibrations) of the micro-milling process and the characterising repetitions and frequencies of the surface.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Experimental investigation of the influence of cutting parameters on surface quality and on the special characteristics of micro-milled surfaces of hardened steels

Balázs

Takács

2021

Proceedings of the Institution of Mechanical Engineers, Part C:

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“…The most favourably broken chips were awarded the mark "5", while the dangerously tangled, flowing chips receive the mark "1". We would like to note that this classification matrix -to our knowledge -was applied first in Hungary by the authors [6][7] [8]. The Figure 1 shows the chip chart of an insert (together with the evalution, "mark").…”

Section: Examination Of the Efficiency Of Cutting Insertsmentioning

confidence: 99%

“…The denial of this myth can be found in [9][10]. With the following example it will be presented how to substitute the factors, mentioned earlier, into the (1) relationship.…”

Section: Examination Of the Efficiency Of Cutting Insertsmentioning

confidence: 99%

A new method for analysing the efficiency of cutting inserts

Sipos¹

2018

EasyChair Preprints

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-The operational productivity and the economic efficiency of turning, drilling and milling inserts can be expressed by cutting performance. This complex definition is composed of several main and supplementary features, therefore it is not possible to characterise it by only one indicator. In the present article a new method will be introduced, being able to measure and compare the productive efficiency of turning inserts: the four most important features will be summarised in one indicator. The procedure has a low time requirement, it is built on instrumental investigations, so it does not require great financial and material expenses, it makes possible to use the tools in an optimal way, according to the four aspects, investigated by us, and to qualify the inserts in many ways. The so called complex efficiency indicator serves to measure the effectiveness of innovation, too. The procedure, developed by us, has already been used successfully in case of tools, produced by leading companies and having different functions, design and materials. IntroductionNowadays, in the area of cutting operations there are appearing new versions of mounted tools. The cutting elements, the inserts, optimised to the given task, are fixed in the tool holders, drill and milling cutter bodies by the manufacturing companies. Although the amount of operationally applicable shape variations is quite limited, the number of the chipbreakers and edge designs, usable under different circumstances, is considerably great. The operational productivity and economical efficiency of turning, drilling and milling inserts can be mostly described by the cutting performance. This term is a complex feature of the tool (its edge geometry and/or material), serving to judge and qualify its behaviour during cutting operation (wear, tool life, force effects, the shape of the developed chips etc.) and the achieved surface quality (waviness, roughness) of the machined workpiece. The judgement is always built on practical experiences, it provides a characterisation, describable with words, i. e. it has a quantitative character. For example, an insert is considered to be appropriate if it breaks the chip well and its wear process is low. The qualification is mainly built on instrumental measurements, it characterises the productive efficiency of the tested tool with the results of measurements, depending from the adjusted data combinations, i. e. in a qualitative wayThe following article is going to introduce a method for measuring and comparing the cutting performance of cutting inserts. The procedure is built on short-time examinations; therefore it does not require great material, instrumental and financial expenses. The developed method has been successfully applied in case of tools, having different tasks, constructions, cutting materials and produced by world-famous tool manufacturing companies [3][4].

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“…It may well happen that the Rt (maximum unevenness) and Rz (roughness height) parameters differ greatly from the average roughness values, measured on a certain surface [13]. It is increasingly true in case of machined surfaces of AMSF, divided by roughness valleys to a great extent (Fig.…”

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confidence: 95%

Surface Structure Analysis of Syntactic Metal Foams Machined by Milling

Szalóki

Viharos

2017

Period. Polytech. Mech. Eng.

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IntroductionIn order to meet the market demands, the use of man-made composite materials is expected to grow tenfold in the future [1]. This forecast is confirmed by the expectations, awakened by the particularly favourable properties of composite materials, having different base materials. The primary objective of development of newer and newer metal matrix composites is to increase the mechanical strength, to make the friction and wear resistance more favourable, to influence the thermal expansion/stability, and the intention to reduce the mass while maintaining low density [4].The machining of composite materials requires new approach not only from the point of view of cutting tool geometry and tool material, but also from the aspects of interpretation of surface quality, machined by the tool (roughness, waviness, layer properties etc.); moreover, in the qualification of working surfaces of components, too. The matrices of metallic composites (Al, Cu etc.) are usually soft, while the reinforcement is created by abrasive materials, have great hardness (Al 2 O 3 , SiC etc). The last-mentioned materials wear out the traditional milling tools to a greater extent and the cutting temperature increases during the machining, too. From a surface point of view it means that the surface quality will be changed as a result of the significant mechanical impact, caused by the thermal dilatation, microstructural changes and cutting forces. Considering the roughness of the machined surface, it can be noticed that the extremely rapid wear of tool is determinant: parallel with the development of the wear process, there is a constant change in the roughness: it oscillates often, but seeing its tendency, mostly it becomes worse.

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Experimental Research of Cutting Performance and Quality Abilities of Modern Drilling Tools

Cited by 7 publications

References 1 publication

Experimental investigation of the influence of cutting parameters on surface quality and on the special characteristics of micro-milled surfaces of hardened steels

Experimental investigation of the influence of cutting parameters on surface quality and on the special characteristics of micro-milled surfaces of hardened steels

A new method for analysing the efficiency of cutting inserts

Surface Structure Analysis of Syntactic Metal Foams Machined by Milling

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