The production process is a role of the management system consisting in determining the optimum, most economical or productive conditions for implementing a particular manufacturing operation. The management system of production process should ensure that the given process complies with its intended use without undesirable failures or risks Vysočanská et al., 2009).The machining of materials is a working process by which a semi-finished product obtains the required shape and dimensions of a part by removing the material from the surface layer. The most widespread method of machining is cutting in which material is removed in the form of chips by mutual interaction of the tool and workpiece. Based on a long-term development of cutting materials, creating a completely new cutting material cannot be expected in the near future; therefore, the research of leading manufacturers of tools and cutting materials is primarily aimed at improving existing materials, specifying their optimal use, and exactly defining fields of their application.In the cutting process, the cutting part of the tool is exposed to high temperatures, mechanical stress, friction, vibrations and sudden thermal and mechanical shocks. Therefore, the measurement and examination of material behaviour under these conditions is an integral part of the research and development of cutting materials.The aim is to monitor and evaluate changes in cutting forces between the cutting tool and workpiece in turning, induced by different properties of individual cutting tips, and also monitoring changes in these characteristics in three different speeds of the lathe spindle.We have focused on studying the effect of cutting material (exchangeable cutting tip) and chip former geometry on cutting forces. In order to monitor the effect of one factor only, measurement conditions were necessary to be ensured so as to eliminate other factors that could influence the change in these parameters. We used the cutting tips of the same type (DNMG 150608), of various cutting materials, and with several chip former types. When assessing the effect of cutting material, we compared only those tips the only distinguishing feature of which was cutting material. We proceeded in the same way when assessing the effect of the geometry of cutting tips chip former. Furthermore, we were also interested in how individual cutting tips behave at different speeds; therefore, our measurements were conducted at three different speeds, i.e. n 1 = 710 rpm -1 , n 2 = 1,400 rpm -1 and n 3 = 2,240 rpm -1. Other cutting conditions were held constant, i.e. cut depth a p = 1 mm and feed rate f = 0.1 mm -1 . Steel 11 523 belonging to the group P was used as a material sample. The cutting tips used for our measurements are intended for machining this group of materials. Characteristics of sampleFour samples of the same shape, size and material were used for the experiment.The dimensions of the sample are shown in Figure 1. The sample was clamped using a three-jaw chuck. Since we needed to avoid vibration, ...
The aim of this paper is to present the possibilities of using the Pareto method in evaluating the effectiveness of machine production processes. The paper deals with the production process of material cutting using progressive technology and subsequent evaluation of its effectiveness and quality. In the production process, we have used the method of material cutting by abrasive water jet. The Pareto analysis was used for eliminating the shortcomings in the quality of the final part.
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.
The paper is focused on confirmation of an effect of cutting materials and cutting inserts geometry on cutting forces and temperature, quality and accuracy of machined surface in turning. The main part is devoted to description of advanced turning tools and cutting materials. The experimental part is focused on cutting forces and temperature measurement and machined surface quality in turning of steel grade 11 523 samples with one feed and depth of cut value and varying spindle speed. Measurements were performed with various types of indexable cutting inserts used. Measured values were evaluated in terms of the effect of different properties of cutting inserts and various spindle speed values.Keywords: accuracy, cutting inserts, cutting forces, cutting materials, roughness, temperature, turning Abstrakt Článok je zameraný na preukázanie vplyvu rezných materiálov a geometrie rezných doštičiek na rezné sily a teplotu pri sústružení, kvalitu a presnosť obrobeného povrchu. Podstatná časť je venovaná opisu moderných sústružníckych nástrojov a rezných materiálov. Praktická časť je zameraná na meranie rezných síl, teploty rezania a kvality opracovaného povrchu pri sústružení vzorky materiálu ocele 11 523 pri konštantnej hodnote posuvu a hĺbky rezu a pri meniacich sa hodnotách otáčok vretena. Merania budú vykonávané pri použití vymeniteľných rezných doštičiek rôznych druhov. Namerané výsledky sa budú hodnotiť z hľadiska vplyvu rozdielnych vlastností rezných doštičiek a meniacich sa hodnôt otáčok vretena.Kľúčové slová: drsnosť, presnosť, rezné materiály, rezné doštičky, rezné sily, sústruženie, teplota 86Journal of Central European Agriculture, 2014, 15(1), p.86-93 86 Journal of Central European Agriculture, 2014, 15(1), p.86-93 DOI: 10.5513/JCEA01/15.1.1416 Detailný abstraktCieľom práce bolo sledovanie a hodnotenie zmien teploty medzi rezným nástrojom a obrobkom. zmien rezných síl pri sústružení vyvolaných odlišnými vlastnosťami jednotlivých použitých rezných doštičiek a zmien týchto charakteristík pri troch odlišných hodnotách otáčok vretena sústruhu.Pozornosť sa sústredila na vplyv rezného materiálu a geometriu utvárača na teplotu pri sústružení. Aby bolo možné sledovať výlučne vplyv jedného faktoru, bolo potrebné zabezpečiť podmienky merania tak, aby boli odstránené ostatné faktory, ktoré by mohli vplývať na zmenu týchto veličín. Použili sme rezné doštičky rovnakého typu DNMG 150608, rôznych rezných materiálov s viacerými typmi utvárača. Pri hodnotení vplyvu rezného materiálu sme porovnávali iba tie doštičky, ktorých jediným odlišujúcim znakom bol práve rezný materiál. Rovnako sme postupovali aj pri hodnotení vplyvu geometrie utvárača rezných doštičiek. Sledovali sme, ako sa budú jednotlivé rezné doštičky správať pri rozdielnych otáčkach, preto naše merania prebiehali pri troch rôznych otáčkach, a to pri n 1 = 710 min -1, n 2 = 1400 min -1 a n 3 = 2240 min -1. Ostatné rezné podmienky (hĺbka rezu a p = 1 mm a posuv f = 0.1 mm -1 ) zostali konštantné. Ako vzorka materiálu bola použitá oceľ 11 523, ktorá patrí d...
Polák P., Mikuš R., Kročko V., 2014. Monitoring of conditions of agricultural machines' parts in operation. Res. Agr. Eng., 60 (Special Issue): S57-S65.This contribution focuses on problems of monitoring the runout of tractor diesel motor parts used in agricultural operation. Crankshafts from the agricultural tractors of type Zetor 6911 are used as samples for measuring the runout and circularity. The first sample of the crankshaft is loaded in the tractor used in livestock production, and the second one is used in vegetable production. Measured values of the runout and circularity of both samples are evaluated by tables and polar diagrams. Results of the experiment show the amount of runout and the following wear of agricultural machine parts in different operating conditions of agricultural production.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.
hi@scite.ai
10624 S. Eastern Ave., Ste. A-614
Henderson, NV 89052, USA
Copyright © 2024 scite LLC. All rights reserved.
Made with 💙 for researchers
Part of the Research Solutions Family.