Manufacturing Technology Journal, 2016 (vol. 16), issue 6
Unconventional Methods of Thermomechanical Treatment of Tool Steel
David Aisman, Katerina Opatova, Katerina Rubesova, Stepan Jenicek
Manufacturing Technology 2016, 16(6):1226-1230 | DOI: 10.21062/ujep/x.2016/a/1213-2489/MT/16/6/1226 
Tool steels are traditional materials whose heat treatment routes are well-established. Despite that fact, unconventional treatment methods can be used, for instance for refining chromium carbides and general strengthening of the structure. One of the methods that considerably alter microstructure is semi-solid processing. By means of passing through the semi-solid state, the X210Cr12 steel (ČSN 19436) developed a microstructure of polyhedral austenite grains embedded in a carbide network. Forming of this material at an appropriate temperature led to recrystallization of the austenitic microstructure and to uniform distribution of carbides with a size...
The Study of Defects on Galvanically Plated Polymeric Parts
Zuzana Andrsova, Petr Podzimek, Pavel Kejzlar
Manufacturing Technology 2016, 16(6):1230-1234 | DOI: 10.21062/ujep/x.2016/a/1213-2489/MT/16/6/1230
Galvanic plating of polymeric structural parts is widely used in many industrial branches, e.g. in automotive. Minor errors in their manufacturing process are responsible for presence of surface defects. These defects, especially in the case of visual and decorative parts, are unacceptable. This paper demonstrates the usage of optical and electron microscopy to reveal and solve common problems in industrial production. Different types of galvanic plating defects on injection molded parts made of ABS, PC/ABS and PA manifest themselves by different ways.
Tribological Properties of TiN/AlTiN and AlTiN/TiN Nanomultilayer Coatings
Totka Bakalova, Nikolay Petkov, Hristo Bahchedzhiev, Pavel Kejzlar, Petra Zdobinská
Manufacturing Technology 2016, 16(6):1234-1240 | DOI: 10.21062/ujep/x.2016/a/1213-2489/MT/16/6/1234
The paper presents the research results of the various coatings deposited using the cathodic arc evaporation Physical Vapour Deposition (PVD) method at 300°C, suitable for application on temperature-sensitive steels and alloys. Three main groups of coatings are deposited, denoted as E1, E2 and E3. The deposited bi-layer numbers for E2, E3 and E4 are 103, 207 and 107, respectively. Each group consists of two subgroups, S1 and S2, TiN/AlTiN and AlTiN/TiN nanomultilayer (NML) coatings, respectively. The coating deposition time for E1 and E2 is 60 min, and the carousel rotation speed is 35s and 17.5s, respectively. The coating thicknesses for these two...
Alternative Uses of Eddy Current Inspection in Materials Engineering
Petr Beneš, Matěj Kotrba, Antonín Kříž
Manufacturing Technology 2016, 16(6):1240-1243 | DOI: 10.21062/ujep/x.2016/a/1213-2489/MT/16/6/1240
There are a large number of special methods for exploring the internal condition of materials on the basis of eddy currents. A major use of this method can be seen in surface engineering, particularly in studying some state quantities of surface integrity. It is also an irreplaceable tool in surface engineering. The reason is that no other affordable method provides information on both the surface and the sub-surface regions, as the latter are difficult to reach by most other inspection methods. It must be noted that the sub-surface region is significant, and dictates, to a large extent, the behaviour of the overlying surface. This article explores...
Novel Porous Ti-Based Alloys for Implants with Enhanced Bioactivity
Adriana Bernatiková, Pavel Novák, Dana Rohanová
Manufacturing Technology 2016, 16(6):1243-1248 | DOI: 10.21062/ujep/x.2016/a/1213-2489/MT/16/6/1243
Porous titanium implants are increasingly used for excellent corrosion resistance, mechanical properties similar to bone, biocompatibility and good osseointegration ability. The advantages of porous structure are lower density which causes better ingrowth of bone tissue. Changing the porosity influences resulting mechanical properties. Higher porosity decreases the elasticity modulus and tensile strength. Newly developed alloys based on titanium and silicon can be used as bone fillers, artificial interverbal discs, augmentations or dental implants. Titanium and silicon are nontoxic elements for human body, which is very important for biocompatibility....
Influence of the Degreaser Type on the Bonded Joint Strength
Milan Brožek
Manufacturing Technology 2016, 16(6):1248-1254 | DOI: 10.21062/ujep/x.2016/a/1213-2489/MT/16/6/1248
In the report the results of bonded joints laboratory tests are published. The determination of the tensile lap-shear strength of rigid-to-rigid bonded assemblies according to the standard CSN EN 1465 (66 8510) was the aim of the carried out tests. The samples were made from steel sheets. For bonding of test samples four different types of adhesives were used (two super glue adhesives, one epoxy adhesive and one contact adhesive). Ahead of bonding the surfaces of all samples were blasted using corundum grit and degreased. For degreasing four various types of five different degreasers were used, namely perchlorethylene, acetone, methanol, technical...
Microstructure of Twin-roll Cast Al-Mg-Sc-Zr Alloy
Miroslav Cieslar, Jan Bajer, Mariia Zimina, Olexandr Grydin
Manufacturing Technology 2016, 16(6):1255-1259 | DOI: 10.21062/ujep/x.2016/a/1213-2489/MT/16/6/1255
A model twin-roll cast Al-Mg-Sc-Zr alloy was prepared and the evolution of microstructure during a step-by-step isochronal annealing was characterized by electron microscopy and light optical microscopy. Inhomogeneous structure with significantly finer grains in the middle of the strip is generated by casting. Subsequent annealing up to 550 °C does not alter this grain-size mainly due to the presence of a fine dispersion of Al3(Sc,Zr) particles, which forms at annealing temperatures below 300 °C. Although these particles coarsen and partially transform at higher annealing temperatures their strengths as recrystallization inhibitors is sufficient to...
Reduction of Sink Marks in Injection Overmolding Process of Metal-Plastic Parts
Ernest Gondár, Alexander Schrek, Pavol Švec
Manufacturing Technology 2016, 16(6):1259-1264 | DOI: 10.21062/ujep/x.2016/a/1213-2489/MT/16/6/1259
Metal-plastic parts with steel inserts prepared by overmolding technique showed several molding defects including sink marks. The depths of sink marks on overmolding metal-plastic parts prepared at two injection overmolding temperatures of 280 and 230 °C and the same packing pressure of 60 MPa were measured by contact profilometer. They reached the depths of 3.02 mm and 1.51 mm at the overmolding temperature of 280 and 230 °C respectively. These values were correlated with sink marks indexes simulated in Moldflow software at the same conditions. Based on the simulated and measured results the optimal process parameters with injection temperature of...
Handling Simulation of Vehicles
Milan Chalupa, Josef Veverka
Manufacturing Technology 2016, 16(6):1264-1269 | DOI: 10.21062/ujep/x.2016/a/1213-2489/MT/16/6/1264
The article describes the vehicle passability testing possibilities by the help of computational simulation with the usage of computing simulation system ADAMS AVT. The simulation calculations can help to find quick answers to basic and additional questions of design change influences in the area of testing vehicle passability. The first part of the article contents description of partial computation simulation models construction which the calculations are associated with. The binding conditions of calculations are mentioned also. In the second part of the article, there are mentioned and evaluated the results of performed simulation calculations....
Simulation of Spinneret Micro-hole Spade Drill Drilling Based on DEFORM-3D
Zhang Chunyan, Yang Chongchang, Zhang Ronggen
Manufacturing Technology 2016, 16(6):1269-1274 | DOI: 10.21062/ujep/x.2016/a/1213-2489/MT/16/6/1269
An emulation study of the drilling by the spade drill on the spinneret micro-hole is conducted by using FEM analysis software Deform-3D. According to application of finite element software Deform-3D, some characteristic parameter of the work piece and the cutting tool material are set. The distributed situation of cutting force, cutting temperature and tool wear in different cutting parameters are simulated analysis. By discussing the location of the spade drill drilling wear, further optimization of parameters cutting and tool for the spinneret micro-hole drilling provide the better basis.
Preparation of Ti-Al-Si Alloys by Powder Metallurgy
Anna Knaislová, Pavel Novák, Filip Průša
Manufacturing Technology 2016, 16(6):1274-1278 | DOI: 10.21062/ujep/x.2016/a/1213-2489/MT/16/6/1274
Ti-Al-Si alloys are very prospective materials for many applications, particularly for automotive and aerospace industry, due to their low density, excellent resistivity to oxidation and heat stability. The main problem is high brittleness at room temperature and high mechanical characteristics persisting only up to 800 °C, which is limiting in some applications. Ti-Al-Si alloys were prepared by powder metallurgy using Self-propagating High-temperature Synthesis (SHS), which is considered as a first step in production consisting of SHS, milling and consolidation by Spark Plasma Sintering. In this experiment the observed subject was the microstructure...
Influence of Thermodynamic Phenomena at the Optimum Cutting Parameters when Grinding
Karel Kocman
Manufacturing Technology 2016, 16(6):1278-1284 | DOI: 10.21062/ujep/x.2016/a/1213-2489/MT/16/6/1278
In particular, the quantitative and qualitative results of the technological process are in most cases determined by the level of finishing operations, which include in particular grinding. It is characterized by high precision, the accuracy of geometric shape and generally very good quality surface. One of the factors to achieve the desired quality of finished surfaces, in particular, knowledge of the effect of temperature of the contact surface of the grinding wheel and the ground. In the article is the methodology of the quantification of the impact of cutting parameters on the temperature of the grinding. Another requirement is the right choice...
Qualitative Evaluations of the AlSi7Mg0.3 Microstructure by the X-Ray Diffractometry
Jan Lago, Ondřej Řidký, Otakar Bokůvka, František Nový
Manufacturing Technology 2016, 16(6):1284-1291 | DOI: 10.21062/ujep/x.2016/a/1213-2489/MT/16/6/1284
Nowadays it's very important to minimalize the costs of casted parts, what obviously conclude to reduction in time that is necessary for the heat treatment. Despite this fact it's necessary to keep or moreover increase mechanical properties like a strength, ductility, toughness and dimensional stability. Better mechanical properties lead to the better material utilisation, this parameter is represented by the following formula: Q = Rm + k.logA5, known as a Quality index and increase of this parameter conclude to weight reduction of casted part. For obtaining good quality of the casted part it's very important to watch the cast's internal composition,...
A Multi-Directional Magnetic Treatment Approach to Improve the Dimensional Stability of Bearing Rings
Xuemei Li, Qingsheng Xie, Shaobo Li, Wangbiao Qiu
Manufacturing Technology 2016, 16(6):1291-1296 | DOI: 10.21062/ujep/x.2016/a/1213-2489/MT/16/6/1291
Comparing with one directional magnetic treatment, a multidirectional magnetic treatment is applied to reduce residual stress in thin-walled bearing rings in order to improve the dimensional stability of bearing rings. The magnetic field was applied in both the axial and the radial directions of the thin walled bearing rings respectively. Six months of repeated testing results demonstrated that the dimension of bearing rings after magnetic treatment had no significant change. Experimental results shows both the major axis(the longer axis of an ellipse)and the minor axis(the shorter axis of an ellipse)appear shorten tendency and the dimension of bearing...
A Study on Rebound Characteristic of Sealing Ring Used in Solid Rocket Motor
Lin JingDong, Huang JinLin, Chen Junhong, Huang Li
Manufacturing Technology 2016, 16(6):1297-1303 | DOI: 10.21062/ujep/x.2016/a/1213-2489/MT/16/6/1297
Solid Rocket Motor (SRM) is a key component for the missile and space rocket. Sealing performance is an important index for SRM assembled. It is a necessary condition for study on the sealing performance of SRM to determine the residual stress of sealing ring which is difficult to be obtained by direct detection in engineering practice. This paper derives the quantitative expression of the relationship between residual stress, pressure difference and preload stress and establishes the method of determining residual stress of sealing ring by mechanical analysis. With the help of experiment, verify the correctness and applicability for expression meanwhile,...
Statistical Monitoring of Decrease of Surface Eccentricity and Hole of Barrel Tubes from High Strength Steels under the Production Conditions
Jozef Majerík, Jozef Šandora, Jaroslav Jambor
Manufacturing Technology 2016, 16(6):1303-1308 | DOI: 10.21062/ujep/x.2016/a/1213-2489/MT/16/6/1303
This work investigates issues of BTA drilling of deep holes with slenderness ratio L: D = 45/60 of high strength steels with a tensile strength of Rm = 1350/1600 MPa. Methodology for testing of surface when turning and boring deep holes after drilling accordingly, heat treatment, straightening annealing and stress relief, was based on the statistical monitoring of eccentricity surface deviation from the theoretical axis of the bore axis for instruments with changeable carbide cutting inserts with CVD/PVD coatings under operating conditions with the number of 30 pieces. Measurement results of eccentricity of surfaces for locating strips before and after...
Investigation of Thrust Force and Delamination during Drilling of C/PPS
Petr Masek, Petr Kolar, Pavel Zeman, Martin Vrabec
Manufacturing Technology 2016, 16(6):1308-1314 | DOI: 10.21062/ujep/x.2016/a/1213-2489/MT/16/6/1308
Drill bits used for machining of composite materials can have different geometries and it is difficult to choose suitable geometry for a specific type of composite. Unsuitable geometry of a drill bit leads to bad surface quality. The objective of this paper is to find the most suitable drill bit geometry for machining of the thermoplastic composite C/PPS in terms of surface quality and magnitude of thrust force under different cutting conditions. Three drill bits were chosen for experimental investigation. A significant influence of the point angle was identified. A gradually decreased point angle together with an increased rake angle of the cutting...
Fixtures Design for Increasing of Quality Production of Cast Workpiece with Weld Deposit
Peter Pavol Monka, Jaromír Markovič, Katarina Monkova, Jan Řehoř, Slavomír Hric, Dušan Manduľák
Manufacturing Technology 2016, 16(6):1314-1319 | DOI: 10.21062/ujep/x.2016/a/1213-2489/MT/16/6/1314
The article deals with the principles of fixtures design and their application at machining of armature DM 100, PN 25/40-RF. It is bulky component that is produced by casting technology. Surfaces near the hole of valve are hard machinable due to weld deposit. Considering elimination of clamping device weaknesses that could originate due to unsuitable design and production, it is advantageous to use a virtual model along with simulation and analysis in CAD/CAM system. Nowadays technologists have strong tools in their hands that increase efficiency of solution not only conventional, but also specific, problems. On the other hand, they have to know to...
Chip Formation Comparison - Merchant's Model vs. Model with Rounded Cutting Edge
Katarína Monková, Jaromír Markovič, Peter Pavol Monka, Jan Řehoř, Peter Pastucha
Manufacturing Technology 2016, 16(6):1320-1326 | DOI: 10.21062/ujep/x.2016/a/1213-2489/MT/16/6/1320
Merchant's model of chips formation considers an "ideal" (sharp) cutting edge. However, nowadays many manufacturers of cutting tools modify the tool geometry with the goal to increase the tool life and to improve the surface quality. The processes, at which the modified tools are used, go along with chip formation and physical phenomena that differ from Merchant's model.The article deals with the simulation of chip formation at various ratios of rounded cutting edge and cutting thickness. Aim of the research has been focused on the interpretation of new knowledge from the cutting theory. Authors have tried to understand the theory of cutting process...
Optimization Machining of Titanium Alloy Ti-6Al-4V by WEDM with Emphasis on the Quality of the Machined Surface
Katerina Mouralova, Jiri Kovar, Zdenek Karpisek, Pavel Kousa
Manufacturing Technology 2016, 16(6):1326-1331 | DOI: 10.21062/ujep/x.2016/a/1213-2489/MT/16/6/1326
The objective of this work is to assess cutting speed during the wire electrical discharge machining (WEDM) depending on the machine parameters setting (gap voltage, pulse on time, pulse off time, wire speed and discharge current) and follow-up assessment of the surface quality achieved. In order to achieve efficient machining the maximum cutting speed is required, however maintaining of the required quality and functional characteristics of the machined surface must be considered. Surface morphology during the wire electrical discharge machining is formed by a high number of craters, of which depth has direct effect on area parameters and profile...
The Influence of Laser Beam on the Surface Integrity of Cutting Edge
Rastislav Nigrovič, Jozef Meško, Andrej Zrak
Manufacturing Technology 2016, 16(6):1332-1336 | DOI: 10.21062/ujep/x.2016/a/1213-2489/MT/16/6/1332
The presented scientific article deals with cutting edges after cutting by laser beam. The article describes the characteristics of the laser beam the factors entering into the process of cutting by CO2 laser, and their interaction on the integrity of the cutting edge of selected technical materials - steel S23JR. The article includes experimental evaluation of the interaction of input factors and parameters on experimental samples with thickness t= 2 mm which were cut by applying different parameters for the accurate assessment of the impact for each selected technological parameters. The experimental part of this article deals with changes of speed...
Mechanical Properties of Co-Cr-Mo Alloy in Dependence in the Composition and Production
Kateřina Nová, Pavel Novák, D. Dvorský, J. Zýka
Manufacturing Technology 2016, 16(6):1336-1340 | DOI: 10.21062/ujep/x.2016/a/1213-2489/MT/16/6/1336
The aim of this work was studying the effect of the composition and production on mechanical and tribological properties of cobalt alloys. Co-Cr-Mo alloy began to be used for manufacturing dental implants, but nowadays they are successfully used for the production of orthopaedic implants thanks to better wear resistance than is offered by titanium implants. However, there is still ongoing effort to even more improve the wear resistance and other properties of cobalt based alloy. The aim of this research was to find a suitable combination between composition and production, which would increase the wear resistance, keeping the other mechanical properties...
Application of Powder Metallurgy in Production of Biomaterials
Pavel Novák, Kateřina Nová, Adriana Bernatiková, Andrea Školáková, Pavel Salvetr
Manufacturing Technology 2016, 16(6):1340-1343 | DOI: 10.21062/ujep/x.2016/a/1213-2489/MT/16/6/1340
Metallic biomaterials are currently produced mainly by conventional metallurgical processes, i.e. the melting and casting used e.g. in production of cobalt alloy implants, or forming processes as cold or hot working (rolling or forging of stainless steel for surgical applications). Such processes including melting are used also in production of "smart" biomaterials - NiTi shape memory alloys. The mechanical properties are strongly dependent on the grain size. Therefore, the techniques to obtain finer structure are very desirable to enhance the mechanical properties of the biomaterials and thus to increase lifetime of the implant. This paper is devoted...
Measurement Precision KUKA Robots Move at a Defined Distance and Proposal for a Robotized Workplace to Support the Learning Process
Dominika Palaščáková, Peter Demeč
Manufacturing Technology 2016, 16(6):1344-1350 | DOI: 10.21062/ujep/x.2016/a/1213-2489/MT/16/6/1344
This article describes robotised welding workplace and gathering information from the workplace. It focuses on the collection of information to wear welding pliers. The workplace will be linked to a database, which will dispose of the measured data, which we will be able to through the web server we can look on the Internet, anywhere in the world. The advent of the Internet has significantly changed the environment of the production and education. The implementation of Web technology moves to integrate into production systems virtual races. With this rapid information technology we can exchange data on production and products all over the world 24...
High Entropy Alloys Prepared by Combination of Mechanical Alloying and Spark Plasma Sintering
Filip Průša, Alexandra Šenková, Dalibor Vojtěch, Jaroslav Čapek, Adriana Bernatiková
Manufacturing Technology 2016, 16(6):1350-1354 | DOI: 10.21062/ujep/x.2016/a/1213-2489/MT/16/6/1350
High entropy alloys belongs to quite novel materials that are attracting far more attention throughout the entire materials research. They are characterized by wide range of unique properties e.q. ultra-high strength while maintaining its ductility, good corrosion resistance, wear resistance, thermal stability, magnetic properties and many others. Generally, they are composed at least by five elements with nearly eqiatomic compositions that are further characterized by high mixing entropy allowing only formation of solid solutions. The investigated CoCrFeNiMn high entropy alloy was prepared by powder metallurgy processes combining the mechanical alloying...
Influence of the Friction Time on the Shape and Microstructure of the Mixing Zone of the Friction Welded Joint
Nada Ratković, Vukić Lazić, Dušan Arsić, Ružica R. Nikolić, Jozef Meško, Rastislav Nigrovič
Manufacturing Technology 2016, 16(6):1355-1359 | DOI: 10.21062/ujep/x.2016/a/1213-2489/MT/16/6/1355
An analysis of the friction time influence on creation and structure of the mixing zone during the friction welding process of the two dissimilar steels is presented in this paper. The changes were monitored on the two welded samples, made of the highly-alloyed steel HS 6-5-2-5 and the high carbon C60 steel. The objective of this work was to show how the mixing zone is created and to point to its influence on the quality of the whole welded joint, since it is characterized by the inhomogeneity of the microstructure and the chemical composition. Those problems arise due to the thermal and deformation conditions, so during the experiment the welding...
Changes in Microstructure and Properties of Ni-Ti Alloy after Addition of Ternary Alloying Element
Pavel Salvetr, Andrea Školáková, Pavel Novák
Manufacturing Technology 2016, 16(6):1359-1363 | DOI: 10.21062/ujep/x.2016/a/1213-2489/MT/16/6/1359
In this work, the influence of alloying element in equimolar Ni-Ti alloy was investigated. Selected alloying elements (cobalt, chromium, niobium) were added into Ni-Ti46 wt. % powder mixture. The samples were prepared by self-propagating high-temperature synthesis at temperature of 1100 °C with the use of high heating rate (300 °C/min). The changes in microstructure, phase composition, temperature of reaction between Ni-Ti-X powders, phase transformation temperatures and mechanical properties were studied.
Construction of Mechanic Regulation of Turbine Ventilator using Half-Flap
Josef Sedlak, Jiri Malasek, Martin Ondra, Ales Polzer
Manufacturing Technology 2016, 16(6):1364-1370 | DOI: 10.21062/ujep/x.2016/a/1213-2489/MT/16/6/1364
An article deals with a definition, concept, development, calculation and construction of a prototype solution of a mechanical regulation of a turbine ventilator using a half-flap eliminating an amount of ventilated air. The whole mechanical regulation solution lies in a central shaft. When a rotation nozzle is spun to high revolutions, a flap closes gradually and eliminates air flowing. This prototype of the mechanical regulation may be used for classic concepts of turbine ventilators, where the rotation nozzle stays in one position and only rotates around its own axis.The article describes individual development stages from the concept up to...
Effects of Grit Blasting on Surface Properties of Adhesive Bonded Adherents
Petr Valášek, Miroslav Müller
Manufacturing Technology 2016, 16(6):1371-1375 | DOI: 10.21062/ujep/x.2016/a/1213-2489/MT/16/6/1371
A mechanical treatment of an adherent before an application of adhesives is one of key factors influencing resultant strength of an adhesive bond. A grit blasting belongs among one of the most often used methods of the surface treatment. A resultant structure of blasted adherent and also parameters of the surface roughness can be changed during the blasting by a suitable choice of many parameters among which a material and a size of abrasive particles, a distance of an air jet and a blasted material, a size of the jet, an air pressure and an angle of abrasive particles impact can be ranked. This experiment describes an injector system of grit blasting...
Physical and Metallurgical Views on the Process of Chip Creation
Karol Vasilko
Manufacturing Technology 2016, 16(6):1375-1379 | DOI: 10.21062/ujep/x.2016/a/1213-2489/MT/16/6/1375
To understand the process of chip creation during machining requires knowing the behaviour of metal at high degrees of mechanical and thermal stress which occurs in microvolumes of machined material. During machining the chip is characterized by unique deformation structure which does not occur with other methods of mechanical metal machining. This is the reason why its explanation is rather complex. The implementation of the knowledge of metal physics in confrontation with the experiment can finally contribute to the optimization of the process of metal machining and the selection of optimal cutting conditions.
Structural Damping of Mechanical Vibration
Martin Vašina, Lumír Hružík, Adam Bureček
Manufacturing Technology 2016, 16(6):1379-1382 | DOI: 10.21062/ujep/x.2016/a/1213-2489/MT/16/6/1379
Mechanical vibration is undesirable in the majority of cases. It can have a negative influence on accuracy of manufacture, service life of processing equipment and tools, labour protection, human health and so on. Excessive noise belongs to the accompanying phenomena of the mechanical vibration too. For these reasons it is necessary to eliminate mechanical vibration in an appropriate manner. There are different possibilities of vibration damping. Application of suitable materials with damping effects belongs to these possibilities. This paper is focused on structural damping of materials. Damping properties of different materials were experimentally...
Use of Optical and Electron Microscopy in Evaluating Optimization by Material-Technological Modelling of Manufacturing Processes Involving Cooling of Forgings
Ivan Vorel, Štěpán Jeníček, Josef Káňa, Khodr Ibrahim, Vratislav Kotěšovec
Manufacturing Technology 2016, 16(6):1383-1387 | DOI: 10.21062/ujep/x.2016/a/1213-2489/MT/16/6/1383
From the technological viewpoint, the manufacture of forged parts is a very complex process governed by countless interrelated factors, the most important of which include temperature profiles, and magnitude and velocity of deformation. For a forge shop, a well-established and optimized forging process guarantees sound profit. Given the changing demands of the market, the range of products and the associated manufacturing parameters must be updated frequently and rapidly. In most cases, this means production line stoppages and production capacity losses due to new process development and optimization. Using material-technological modelling, it can...
Numerical Control Simulation and Experimental Study on End Milling Ordinary Cycloidal Gear in Five-axis CNC Machine Tool
Jianmin Xu, Shanming Luo, Shui xuan Chen
Manufacturing Technology 2016, 16(6):1388-1393 | DOI: 10.21062/ujep/x.2016/a/1213-2489/MT/16/6/1388
A machining method of end milling cycloidal gear using ball end mill is proposed based on the analysis of grinding and side milling ordinary cycloid gear. The machining principle of end milling cycloid gear using 5-axis CNC milling machine is analyzed and the geometric model of end milling cycloid gear is established. At the same time the NC simulation of the machining process is conducted. End milling ordinary cycloid gear is conducted using five-axis machining center and it verifies the feasibility and scientific of end milling ordinary cycloidal gear. The machining precision of the cycloid gear is measured using a three coordinate measuring machine,...
Optimization of Lasers Parameters for Marking Cylindrical Shanks from SC and Cermet
Miroslav Zetek, Martin Mrázek, Ivana Zetková
Manufacturing Technology 2016, 16(6):1393-1398 | DOI: 10.21062/ujep/x.2016/a/1213-2489/MT/16/6/1393
Industrial laser marking of the parts is used for the long life identification. For these the micro engraving and annealing are used. The main requirements for the marking are visibility, readability, stability and especially surface without surface modification or defects. In case of the cutting tools main marking are made on the cutting tool shank so it is necessary to use the correct parameters of the marking setup. The marking must be made without change of accuracy and surface quality. When the bad parameters are used the sharp edges are created on the edge of the descriptions. These edges cause gradually damage of the clamping surface and it...
Research on Integrated Optimization Design Method for Diesel Engine Valve Train
Honggen Zhou, Xuwen Jing, Shuai He, Lei Li
Manufacturing Technology 2016, 16(6):1398-1404 | DOI: 10.21062/ujep/x.2016/a/1213-2489/MT/16/6/1398
In order to have a good performance of gas exchange in working process, a function of six order polynomial dynamic cam was established in this paper. The influence of the maximum ample factor to valve including the maximum positive and negative accelerations and the minimum curvature radius was analyzed by NLPQL. On this basis, multi-body dynamic analysis for diesel engine valve train was done, valve train dynamic model was established by ADAMS, multidisciplinary optimization process of cam profile and its model was put forward, and ISIGHT software was used to optimization and calculation. Finally, a set of different cam parameters and corresponding...
Evaluation of Properties from the Cutting Surface after Applying Laser Beam Technology Using Different Scales of Cutting Speed
Andrej Zrak, Jozef Meško, Augustín Sládek, Martin Vicen
Manufacturing Technology 2016, 16(6):1404-1408 | DOI: 10.21062/ujep/x.2016/a/1213-2489/MT/16/6/1404
This article is focused on the processing of steel materials by thermal cutting technologies - laser cutting. It analyzes the impact of technological parameters - cutting speed effect on the cutting surface quality. The goal is to define the parameters ensuring proper amount of heat absorbed into the material that does not affect the cutting surface to avoid difficultiesduring further processing - such as drilling, thread cutting etc.To determinethe effect of cutting speed on the quality of the cutting surface, it was necessary to measure an internal stress and a hardness of HVM. Internal stresses in the experimental part of the article was measured...