[en] The article studies the issues of static elastic deformations that appear during processing on milling type machines. The method of determining the principal axes of strain is observed. (paper)

[en] Eccentricity is defined as deviation from the circular path and it occurs due to clamping deviation or geometric imperfection when machining elements revolves around the line parallel to the machining element axis, but not around the machining element axis. In this paper, the variation of offset values along the central axial line of different small sections of spindle, tool holder and milling cutter was explored. This work was undertaken by the observation that eccentricity implies adverse impact on the material properties, tooling properties, machining elements, machine system etc. The problem solution was found out by measuring the whole body of spindle, tool holder and milling cutter with Swiss Dial Gauge after dividing them into small sections along the z level axis. After measurement, analysis was done of the recorded data on software’s by illustrating their actual profiles and variation along the Centre line of small divided sections at different orientations. After analysis, we might get the eccentricity of one part with different offsets in z level through offsets in x and y directions and profiles of elements exhibiting less offset values. This work can find its importance in various industries where milling machines are used for machining jet parts, automobile parts and many other etc. (paper)

[en] This paper discusses an underwater machining system for the repair and maintenance of nuclear vessels. It comprises a platform with means for supporting the platform in a substantially horizontal plane; a machining device detachably connectable to the platform comprising a milling or boring machine and a spacial positioning means for locating the milling or boring machines in a precise working position. The spacial positioning means including adjustment means for movement of the milling or boring machine along its X Y and Z axes; a guide means for automatically aligning the machining device on the platform, so that when the detachable machining device is lowered from a detached position above the platform. The guide means automatically aligns the machining device to the platform; and a remote control means for operating the spacial positioning means and the milling or boring machine

[en] In this work we present an innovative method of rotor milling for flexible multifunctional machines. As an alternative to the disc cutters which are often employed in traditional milling machines, we propose a new tool, a finger cutter, which integrates easily with flexible multi-functional machines. This allows much smoother operation with lower required torque which is in line with the characteristics of flexible machines. This paper describes basic geometrical condition to generate the finger cutter profile from the rotor profile, the mathematical formulation, the basic tool design and grinding procedure of the cutter blades. It also discusses the machining process, productivity and accuracy of the proposed method. We believe that this method opens a new way of manufacturing large rotors with fewer production steps while maintaining required tolerances. (paper)

[en] Radiotracer technique was used for the investigation of material transport in a ball mill operated in open circuit and a closed-circuit system for grinding cement components. Mean residence times, mean linear velocities, and number of recycles have been determined. The coefficients of the filling of mill chambers with material have been estimated. The statistical relationship of mean residence time and mill operation conditions has been derived. (author)

[en] Machining of angle borings, particularly borings for welding tapping tube connection for instruments or control rod mechanisms in the bottom and closure spherical domes of nuclear reactor vessels, by means of a device fitted directly to the boring machine that already bores holes in the centre of the borings and which enables the various desired borings to be made as well as the easy adjustment of the various corresponding parameters

[en] The goal of machining is to fulfill processing for high energy efficiency on the basis that processing quality is guaranteed. Chatter-free cutting is a necessary condition to guarantee processing quality. In order to improve the energy utilization rate of milling, a cutting parameters optimization method for milling is proposed with chatter-free cutting as a constraint and energy utilization rate as an optimization objective. First of all, energy consumption characteristics of machine tool are analyzed and high-speed milling & cutting parameters optimization model is established with high energy efficiency as a goal and chatter-free stable cutting as a constraint. Next, on the basis of energy consumption characteristics of machine tool, an optimization model for high-speed chatter-free milling & cutting parameters is established with high energy efficiency as a goal. Stable domain chart for cutting is used to determine optimization range of rotational speed of main shaft. Optimization range of cutting depth and width and feeding speed is determined in combination with cutting force, cutting power, cutting speed and other constraints. Optimized step length of parameters is selected properly so as to obtain cutting parameters rapidly. In the end, confirmatory experiment is performed on a 5-axis engraving and milling machine. Result of the experiment shows energy utilization rate is improved by 154.5%, total energy consumption reduced by 61.5% and processing time shorten by 74.8%. (paper)

[en] In CNC shaping milling machine, the prediction of the state of tool wear has important application significance to improve productivity, reduce scrap rate and avoid security risks. In this paper, the detection and control system of disk milling cutter is set up by the current monitoring method, the input characteristic quantity and target characteristic quantity of BP neural network for tool wear diagnosis are measured, and the disk milling cutter wear condition prediction neural network is established based on the GA-BP algorithm. At last, the online prediction of milling cutter wear state is realized. The network test results show that the prediction rate of tool wear condition is more than 92.78%. (paper)

[en] Full text: Uranium silicide (U3Si2) is presently considered the best fuel qualified so far in terms of uranium loading and performance. Stability of the U3Si2 fuel with uranium density of 4.8 g/cm3 was confirmed by burnup stability tests performed during the Reduced Enrichment for Research and Test Reactors (RERTR) program. This fuel was chosen to compose the first core of the new Brazilian Multipurpose Research Reactor (RMB), planned to be constructed in the next years. This new reactor will consume bigger quantities of U3Si2 powder, when compared with the small consumption of the IEA-R1 research reactor of IPEN-CNEN/SP, the unique MTR type research reactor operating in the country. At the present time, the milling operation of U3Si2 ingots is made manually. In order to increase the powder production capacity, the manual milling must be replaced by an automated procedure. This paper describes a new milling machine and procedure developed to produce U3Si2 powder with higher efficiency. (author)

[en] The demand for micro-scale products is increasing rapidly in various fields of industries such as electronics, bio-medical, optical industry, and so on. Titanium alloys especially Ti-6Al-4V is one of the commonly used in bio-medical industries because of its biocompability properties. However, poor surface quality in terms of surface roughness commonly occurs because of unappropriate cutting parameters to machine this hard to cut material. This study aims to investigate the influencing machining parameters to produce micro-products with a low level of surface roughness in Titanium Alloy (Ti-6Al-4V) material using a miniaturized micro-milling machine. Experiments carried out by micromilling process with variations in low rpm spindle speed and feed rate with a constant depth of cut using a carbide cutting tool of with a diameter of 1 mm. The machining results in the form of a 4 mm slot with a depth of 10 μm, which then measures its surface roughness. It was found that as the feed rate increases, the surface roughness also accordingly increases. On the other hand, the surface roughness decreases as the spindle speed increases. (paper)