Papers by Keyword: Process

Abstract: This paper was focused on analysis of deformation process in the chip root after milling of material C45. The aim of research was to evaluate the degree of deformation by using the method of oriented test lines. Experimental value of degree of deformation was compared to achieve in computer simulation of milling process in Deform software. The results from the chip root indicates of little differences between simulations and experimental obtained value of degree of deformation.

Abstract: Laser-structured metal surfaces in combination with thermoplastic compression mould processes allow intrinsic hybrid structures with high-strength connections. Suitable process parameters are still to be identified to provide optimised assembly parameters. Therefore, laser structures with different configurations are applied to steel sheets and compressed with textile reinforced thermoplastic composites to manufacture hybrid structures. Laser processing parameters, such as pulse duration or energy as well as laser scanning strategies and therefore structure dimensions are analysed.After manufacturing, specimens are extracted and characterized in single-lap shear tests comparing different configurations to identify boundary conditions for the laser structuring with optimal bonding characteristics.

Abstract: This publication describes new process chain approaches for the manufacturing of intrinsic hybrid composites for lightweight structures. The introduced process chains show a variety of different part and sample types, like insert technology for fastening of hollow hybrid shafts and profiles. Another field of research are hybrid laminates with different layers of carbon fiber reinforced plastics stacked with aluminum or steel sheets. The derived process chains base on automated fiber placement, resin transfer molding, deep drawing, rotational molding and integral tube blow molding.

Abstract: Recent technology requires multistandard Radio Frequency (RF) chips for multipurpose wireless applications. In RF circuits, a low-noise amplifier (LNA) plays the key role in determining the receiver’s performance. With CMOS technology scaling, various designs has been adopted to study circuit’s characteristic and variation. In this paper, we present the results of scalable wideband LNA design based on complementary metal oxide semiconductor (CMOS), with its variance study. The design was fabricated in 180nm, 90nm, 65nm and 40nm CMOS technology.

Abstract: The article is devoted to the development of a model for monitoring the effectiveness of the organization development. It is suggested that the development is possible only when the norms and standards, upon which the method for determining the rate of development of the organization is proposed, are changed

Abstract: The article is devoted to the application of the method of performance evaluation of the production process design, using associative design. A number of approaches to estimation of efficiency of associative design, which are based on estimates of the design timing, the number of imposed changes at appropriate stages of the product life cycle.

Abstract: CAD models were built for a three-layer SPF/DB cylinder component. FEM method was employed to simulate the SPF/DB process with different girder structure at appropriate temperature/strain rate combinations. The results show that topology parameters of the structure influence the thickness of outer sheet and surface quality. When the thickness ratio of outer sheet to inner sheet exceeded 3:1 and the angle between adjacent ribs was great than 110 degree, ribs were formed and the cylinder surface was perfect. The simulation result was verified by experiment. The experimental results showed that the optimized cylinder structure can be formed at 920°C, 1×10^-4 strain rate perfectly, and the size of blank cylinder diameter can be controlled accurately by SPF/DB mold and the size deviation is less than 0.5mm.

Abstract: Article deals with the possibilities of modelling and simulating in program Extend. It is a simple tool that allows you to model and carry out simulation of specified process to create a good precondition for decision-making. The development of simulation tools and their introduction into industrial practice is the now common practice, particularly in large enterprises. In these turbulent times it is only a matter of time before these virtual tools are commonly used in small businesses.

Abstract: The purpose of this paper is to present the influence of the casting parameters in the process of producing aluminium alloy components of gearbox housing type in automotive industry. The project has as objectives the minimization of the most common casting defects met in casting of gearbox housings through adjusting the parameters of the process. In order to minimize these defects, it was studied the casting speeds in phases I and II, multiplication pressure of phase III and the mould temperature that is influenced by both the cooling channels inside the mould and the spraying process of the mould (lubrication/cooling) that helps regulate the optimum temperature. The experimental results showed that the casting defects such as pores, cast in stages, shrinkage cavities, gas holes and tightness are significantly reduced by periodically controlling and correcting the specific casting parameters.

Abstract: The ring frame is the last machine in the technological process to obtain a high quality yarn. The existing machines in textile industry of our country are equipped with drafting assembly suitable for a series of adjustments. Besides this, the ring frames ensure high draft. The efficiency of this high drafts can be justified through their influence on ring frame production. Another technologic parameter that is related on one hand to the yarn quality and on the other hand to the production is the spindles speed. In this paper it is presented a solution for spinning process optimisation for a yarn Nm 52 made by 45% wool and 55% polyester.