ࡱ>    <@the Clipboard. Do you want this text to be available to other applications after you quit Word?<@A(  d  c 4A?SL1.PCXf <@ .1   &` L & MathType "-Symbol-2 (Symbol-2 i )Times New Romanf-2 8 22 8u TTimes New Romanf-2 8Times New Ro COMPARISON OF THEORETICAL ROUGHNESS IN TURNING AND ORTHOGONAL TURN-MILLING R. Motika S. `kori D. Ciglar Doc.dr.sc. R. Motika, University of Zagreb, FSB, I. Lu ia 5, 10000 Zagreb Mr.sc. S. `kori, University of Zagreb, FSB, I. Lu ia 5, 10000 Zagreb Dr.sc. D. Ciglar, University of Zagreb, FSB, I. Lu ia 5, 10000 Zagreb Keywords: turning, orthogonal turn-milling, theoretical surface roughness ABSTRACT Orthogonal turn-milling is replacing turning because of its advantages such as: higher productivity of the procedure, shape of chip, and longer lifetime of the tools. By using high speeds the centrifugal forces of workpiece clamping devices during turning represent a significant limitation, thus rendering turn-milling an even greater importance. Therefore, the procedure deserves to be systemically analysed and compared to turning. The analysis and comparison of the theoretical roughness of the machined surfaces also gives advantage to orthogonal turn-milling. This provides knowledge and guidelines for further experimental research. 1. INTRODUCTION Orthogonal turn-milling is a particle separation machining process of a more recent date, and it has been formed by combining the processes of turning and milling, by using a milling cutter instead of a turning blade. Turn-milling was initially more widely used in machining of shafts which due to their dimensions and shape do not allow usage of high rotation frequencies (as with crankshaft) necessary for machining. If the milling cutter takes over the main movement and the desired rotation frequency, the shaft can rotate quite slowly, i.e. at the required feed speed. It is then possible to optimise the process. The orthogonal turn-milling is substituting turning wherever possible, and as a result of its multiple advantages, of which the major ones include: higher productivity, shape of chip, longer lifetime of tools. Today, with the use of high speeds, the centrifugal forces of the workpiece clamping devices during turning represent a significant limitation, thus making turn-milling even more significant. The increase of total efficiency of the machining process requires analysis of conditions and machining parameters which raise the existing process to a higher technological and economic level. The main objectives of the modern machining processes are productivity, economy, as well as accuracy and quality of the machined surface. In order to fulfil these objectives, sufficiently reliable mathematical models have to be defined, which describe the mutual dependence of the input and output machining parameters. The previous theoretical analysis can be of great help here. Mathematical models are the basis for defining and optimising the machining process. Almost all the optimisation methods imply the well-known mathematical model. The development and application of CNC machining centres and flexible machining systems require even more reliable mathematical models to be defined that are the basic precondition of high-quality management and control of machining, as well as of predicting the intensity of single influencing factors still in the design phase and process simulation. Figure 1. Orthogonal turn-milling [1] 1.1. Chip During turning, plastic and difficult-to-machine materials form long spirals of chip causing the problem of fracture and removal, and causing disturbances in the machining process, especially on automatic devices and CNC machines. Turn milling is characterised by a half-moon-shaped short chip of various cross sections suitable for removal [1][2]. 1.2. Tool life Unlike turning tool, the milling cutter is a tool with several cutting edges which performs the periodical process of particle separation within the loading-unloading cycle. During the procedure each cutting edge of the milling cutter performs the cutting of material like a turning tool. In the period from one cycle to another, the cutting edge is cooled by air and a liquid coolant, so that it begins the new cycle substantially cooled and covered by a layer of coolant and lubricant, thus providing longer tool life of the milling cutter compared to a turning tool, allowing higher cutting speeds [2][3][4]. 1.3. Productivity Orthogonal turn-milling can be performed in several ways depending on the axial gap between the milling cutter and the workpiece. From the aspect of productivity, the most successful method is eccentric orthogonal turn-milling (Figure 4). The milling cutter bracket (p) has to be equal to the length of the milling cutter front edge (ls) [1][5]. The maximal longitudinal feed (fu) is no longer limited to the length of the milling cutter front edge, but can be several times greater. This is precisely the reason why in paper [5] the eccentric orthogonal turn-milling is analysed compared to the turning and presented by geometric factor of efficiency Kg. The ratio includes the volume of separate particles in the unit of time. If the same cutting speeds are applied (vcg in turn-milling and vctok in turning), and the same feed (fz -feed per milling cutter tooth and f -feed in turning) then Kg is the direct indicator of the machining efficiency in these two procedures. Here Kg depends directly on the longitudinal milling cutter feed (fu), number of milling cutter teeth (zg), milling cutter diameter (Dg). It is always greater than one, and in certain cases can acquire substantially greater values (two, three, even more). The greatest increase in productivity is achieved in the machining of large workpieces, and non-round eccentric or for some other reasons unbalanced mass workpieces. In such workpieces, optimal cutting speeds cannot be used in turning. Formula in paper [5] explains that in such cases the efficiency of the orthogonal turn-milling is multiply increased. The first machine for orthogonal turn-milling was developed at the beginning of the eighties, when the application of this procedure for machining of large workpieces and workpieces of unbalanced mass practically started [3][6]. Modular construction of CNC machines enabled the construction of machines which, with fast modifications, allow complete machining in one clamping. This has contributed to great increase in the production throughput capacity, shortening of the total production cycle, saving in the expensive production shopfloor, and increase in machining accuracy [1]. 2. THEORETICAL ROUGHNESS IN TURNING Figure 2 Theoretical roughness in turning [7] From Figure 2 and OAB triangle, it follows:  EMBED Equation.3  for the approximate and sufficiently accurate calculation one can use RT2 ( 0, so that: [7]  EMBED Equation.3  (1) This expression shows all the influencing magnitudes on the theoretical roughness in turning. The diagram in Figure 3 has been drawn in order to obtain the physical image of the manner of influencing. Figure 3 - Diagram of theoretical roughness in turning 3. THEORETICAL ROUGHNESS IN ORTHOGONAL TURN-MILLING Turn-milling procedures do not result in an ideally circular, i.e. cylindrical cross-section of the workpiece. As presented in Figure 4, the workpiece cross-section has a polygonal shape, and the polygon vertices form deviation from circularity, i.e. the geometry of machined surface. In certain, for the practice interesting circumstances, this deviation can be denoted as theoretical roughness [1]. Figure 4 shows that centric and eccentric orthogonal turn-milling realises, in identical conditions, identical cross-section of a workpiece, so that the deviations from circularity are identical as well. Longitudinally, there are no theoretical deviations from the geometry of the machined surface, if the following conditions are taken into consideration: setting angle of the auxiliary milling cutter edge (r= 0, milling cutter and workpiece axes must be perpendicular to each other, longitudinal feed per workpiece turn should not exceed: length of the front blade (ls) in centric, or maximal feed according to:  EMBED Equation.3   Figure 4 - Geometry of the machined surface in orthogonal turn-milling [1] Deviation from circularity theoretical roughness (RT) can be calculated according to Figure 4, i.e. from the ACO triangle: R02 + (T/2)2 = (R0 + RT)2 The length of the polygon side is obtained from the expression: T = R0 tg( The central angle of the polygon is relatively very small in practical application, of maximum order of magnitude of degree, and can be written:  EMBED Equation.2  by inserting into the initial formula the following is obtained:  EMBED Equation.2  (2) This expression presents all the influencing magnitudes on the theoretical roughness in orthogonal turn-milling. In order to obtain the physical image about the influencing ways, the diagrams in Figures 5 and 6 have been drawn. By transforming further the expression (2) one can write:  EMBED Equation.3  By inserting the expression for the peripheral feed speed of the workpiece (vfo ) and feed per milling cutter tooth(fz):  EMBED Equation.3   EMBED Equation.3  the following is obtained:  EMBED Equation.3  (3) This expression represents the influence of feed per milling cutter tooth and workpiece radius on the theoretical roughness in orthogonal turn-milling. Diagram in Figure 7 has been drawn so as to show the physical picture of the method of influencing. Figure 5 - Diagram of theoretical roughness for workpiece diameter D0= 50 mm Figure 6 - Diagram of theoretical roughness for the milling cutter teeth number zg= 12 Figure 7 - Diagram of theoretical roughness in orthogonal turn-milling CONCLUSION The studies of orthogonal turn-milling performed over the last fifteen years have thrown light on the basic characteristics of the procedure and its advantages compared to turning. This refers primarily to the increased productivity of the procedure, the shape of the chip, and longer lifetime of the tools. Eccentric turn-milling is preferred. The roughness of the machined surface has not been systematically studied. Regarding experiences from practice, the roughness of the machined surface satisfies fully the customers needs and did not require any additional grinding procedures. The comparison of theoretical roughness in case of turning and orthogonal turn-milling in this paper shows that roughness of the machined surface is also an advantage of the orthogonal turn-milling. This is primarily seen in the analysis of the obtained analytical expressions (1) and (3) for theoretical roughness which are functions of the feed (f) and the tool tip curvature radius (r() in turning, i.e. feed per milling cutter tooth (fz) and workpiece radius (Ro) in orthogonal turn-milling. Since the workpiece radius is much greater (in practice more than a hundred times) from the radius of the tool tip curvature, equal feeds result in a significantly lower unevenness in orthogonal turn-milling (more than fifty times). This is presented in diagrams in Figures 3 and 7, which provide graphical presentation of the obtained analytical expressions (1) and (3). 5. LITERATURE [1] `kori S.: Utjecajne veli ine geometrije obraene povraine kod ortogonalnog tokarskog glodanja, M.Sc. Thesis, Zagreb 1994 [2] Sorge K.P.: Die Technologie des Drehfrsens, Dissertation, Carl Hanser Verlag Mnchen Wien 1984. [3] Sorge K.P.: Komplettbearbeiten durch Drehfrsens, Werkstatt und Betrieb 1990/12 p. 921. [4] Schulz H., Spur C.: High speed turn-milling. A new precision manufacturing technology for the machining of rotationally symmetrical workpieces, Annals of the CIRP Vol. 39/1/1990, p. 107. [5] Knig W., Wand Th.: Exzentrisches Drehfrsens, Industrie Anzeiger 30 1984/106 p. 34. [6] Strate H.: Komplettbearbeiten groer Werstcke in einer Aufspannung, Werkstatt und Betrieb 1984/6 p. 345. [7] avar .: Obrada metala odvajanjem estica, `kolska knjiga, Zagreb 1990.  PAGE 8 R. Motika, S. `kori, D. 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