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1

Enabling of automatically generation of cutting paths for three-dimensional pre-contouring with waterjet trimming

Reder Waldemar, Uhlmann Eckart

Journal of Machine Engineering

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2023

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Vol. 23, No. 2

66--76

EN

Abrasive Water Injector Jet Cutting (AWIJC) is a flexible machining process for manufacturing high-performance materials, such as titan- and nickel-base-alloys. Due to the low ductility and thermal conductivity of these materials, conventional machining is struggling with high tool costs and wear. The tool wear in AWIJC is independent of the machined material, and the process has the potential to provide a cost-efficient solution in machining high-performance materials. Trimming, a near-net-shape pre-contouring with multi-stage AWIJC, requires a detailed knowledge of cutting paths for all steps in advance. In order to enable a geometrical flexible manufacturing process, an automatically cutting path generation is necessary. This article presents an application developed with NX Open using Visual Basic. The application TrimCAD is able to provide all necessary geometries for trimming based on the geometries of initial and finished parts. Furthermore, it is possible to adjust the number of cuts and the degree of pre-contouring. All geometries are automatically exported as a standardized three-dimensional STEP-file. The STEP-geometries can be processed to the CAM-processor of the waterjet machine. TrimCAD is an innovative possibility to machine three-dimensional parts made of high-performance materials.

2

Urządzenie do obcinania dennic

Sawicki Tadeusz

Napędy i Sterowanie

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2019

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R. 21, nr 9

165--166

PL

Zdecydowana większość wykonywanych dennic, służących do produkcji zbiorników i cystern, wytwarzana jest metodą tłoczenia na gorąco. Dennica wytłoczona na gorąco nie jest idealnie okrągła i zawsze posiada naddatek na obcięcie. Średnicę dennicy po tłoczeniu wyznacza się z obwodu, tj. mierząc obwód i dzieląc przez liczbę π, otrzymujemy wymagany wymiar. Wysokość dennic jest ściśle regulowana normami i przepisami i uzyskuje się ją po obcięciu.

EN

A considerable number of dished ends of cylindrical tanks, silos and pressure vessels is produced by hot forming. The surplus material obtained in this process needs to be trimmed off for the dished ends to meet the design requirements and conform to the design standards. This is usually achieved by using specialised flanging machines. The two main functional components of these machines are the cutting torch and the carriage platform. The cutting torch must have provisions for being precisely positioned against the flange. The carriage platform must enable smooth movement of the dished ends at a range of angular speeds, thus facilitating accurate operation of the cutting torch. Apart from ensuring dimensional specifications are met, flanging machines often enable a chamfer to be applied to the edge of the flange.

3

Flexible lighting distribution on “party ships”

Mayer O.

Zeszyty Naukowe Akademii Morskiej w Szczecinie

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2017

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nr 49 (121)

9--16

EN

TRIZ trends predict an increased electrification of engineering systems. One of the visible effects of this is lighting, in this case party lights on boats. The need to furnish a boat with colorful illumination requires a flexible, redispatchable system. Cable-bound illumination does not meet this requirement. A solution is presented in this paper using TRIZ as a problem-solving methodology. TRIZ comprises a set of heuristic tools for problem analysis, reformulation, root cause analysis, and problem-solving algorithms. TRIZ, however, concentrates on generating solutions to problems irrespective of given limitations concerning, for example, safety, producibility, or cost. TRIZ provides a direction of thinking that has been proven successful in the past for similar problems. Other tools must, nevertheless, be used to carry out a technical evaluation of the feasibility of the solution, scalability, practicability, or cost target. TRIZ tools are widely used by engineers in multinational corporations such as Intel, GE, Philips, Siemens, Bosch, Boeing, Samsung, LG, and Cochlear. In this paper, selected tools from the overall TRIZ toolbox will be used and explained, with a focus on functional analysis, trimming, and resources. However, other aspects (Trends, Function Oriented Search (FOS), and Ideal Final Result (IFR)) will also be presented.

4

Trimming surfaces in the automatic plane control process

Krawczyk M., Zajdel A.

Journal of KONES

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2017

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Vol. 24, No. 1

223--230

EN

The directions and speed of development of plane avionics systems are determined by three factors: economical consideration, required safety levels, and optimized working conditions for the pilot. This article presents the concept of a system in which the automatic control and stabilization process is effected because of coordinated deflections of trimming surfaces: the rudder, the elevator, and the ailerons. In particular, this article presents the structure of the system in the longitudinal movement steering channel by way of deflection of the trimmer of the elevator. Furthermore, it discusses the results of numerical model simulations, which are compared to the results obtained during in-flight tests. Additionally, this article specifies general technical requirements for the servomechanisms intended for the system class discussed herein. Selection of sufficiently large amplification makes control the plane with relatively small deflections of the trimmer. In particular, relationship between the deflection of the elevator and the deflection of trimmer, view of a tail plane and dimensions of the elevator trimmer, the structure and results of the pitch angle control system and simulation are presented in the article.

5

Application of a SPH coupled FEM method for simulation of trimming of aluminum autobody sheet

Bohdal Ł.

Acta Mechanica et Automatica

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2016

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Vol. 10, no. 1

56--61

EN

In this paper, the applications of mesh-free SPH (Smoothed Particle Hydrodynamics) continuum method to the simulation and analysis of trimming process is presented. In dealing with shearing simulations for example of blanking, piercing or slitting, existing literatures apply finite element method (FEM) to analysis of this processes. Presented in this work approach and its application to trimming of aluminum autobody sheet allows for a complex analysis of physical phenomena occurring during the process without significant deterioration in the quality of the finite element mesh during large deformation. This allows for accurate representation of the loss of cohesion of the material under the influence of cutting tools. An analysis of state of stress, strain and fracture mechanisms of the material is presented. In experimental studies, an advanced vision-based technology based on digital image correlation (DIC) for monitoring the cutting process is used.

6

Multiterminal thick-film and LTCC microresistors : contact effects simulation and trimming procedure consideration

Miś E., Dziedzic A.

Elektronika : konstrukcje, technologie, zastosowania

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2006

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Vol. 47, nr 12

16-18

EN

Multiterminal resistors permit to fabricate equivalents of certain resistor networks onto smaller substrate area. Dimensional effects influence significantly properties of such components and must be taken into account in design procedure. Resistor model with contact effects and deposition imperfections was developed. Numerical simulations based on Finite Elements Method were carried out and results were compared successfully with experimental ones. Trimming procedure for such multiterminal components was also considered.

PL

Niektóre klasy sieci rezystywnych można zastąpić równoważnym rezystorem wielokontaktowym o mniejszej powierzchni. Efekty wymiarowe silnie wpływają na właściwości takiego elementu i należy je uwzględnić w procesie projektowania. Opracowano model rezystora wielokontaktowego uwzględniający efekty kontaktowe i niedokładności procesu nanoszenia. Symulacje numeryczne oparte na metodzie elementów skończonych dały wyniki zgodne z eksperymentem. Rozważono procedurę doregulowywania elementów wielokontaktowych.

7

Modern micropassives: fabrication and electrical properties

Dziedzic A.

Bulletin of the Polish Academy of Sciences. Technical Sciences

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2006

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Vol. 54, nr 1

9-18

EN

This paper presents the concept and modem technological approach to the fabrication of discrete, integrated and integral micropassives. The role of these components in modem electronic circuits is discussed too. The material, technological and constructional solutions and their relation with electrical and stability properties are analyzed in details for linear and nonlinear microresistors made and characterized at the Faculty of Microsystem Technology, Wrocław University of Technology.

8

Computational and experimental analysis of the bolt head trimming process

Petruska J., Borkovec J.

Zeszyty Naukowe Katedry Mechaniki Stosowanej / Politechnika Śląska

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2005

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z. 28

121-124

EN

Bolt head trimming is a fast, complicated cutting process including material failure. For this reason, explicit solver LS-Dyna was used for its simulation. The aim of the simulation was to minimize the loading of the trimming matrix, so that its durability could be enhanced. Three geometrical versions were solved and the results were compared with respect to the cutting work and contact force. As the reliability of the computational model can be questionable, an experiment was carried out to verify the computational results. Cutting force, shape of trimmed areas and distribution of plastic deformation and shear bands were compared with the computational results.