Papers by Keyword: Assembly

Abstract: This study details the design, assembly, and measurement processes of a modified test bench for examining sliding ring seals. We designed a test bench suitable for measuring mechanical seals, during which we first developed the concept and the design of the bench, defined the parameters to be measured and the measurement methods, and then implemented these objectives using an existing test bench. After procuring raw materials, I manufactured and assembled the necessary components, including acid-resistant and corrosion-resistant steel parts. Key machining operations were performed, such as drilling and threading, to accommodate the mechanical seals and ensure proper alignment. Following assembly, I conducted three reference measurements with varying compressive spring forces. The system's torque was measured at a consistent rotational speed of 200 RPM. Results from the frictional torque measurements revealed that the seals displayed sensitivity to compressive forces, confirming the effectiveness of the modified test bench for future seal evaluations.

Abstract: Augmented Reality (AR) has started to be gradually utilized in industrial manufacturing. However, the gap between novel stage and industrial AR-based applications must be comprehensively solved. In this study, the task technology fit (TTF) and method of time measurement (MTM) are applied and put together to create a comprehensive map demonstrating the relationship between manufacturing tasks and AR-solution features. In addition, this map will support exploring the suitability of AR-based solutions and identifying the application areas of AR for industrial manufacturing, primarily focused on quality control, metrology and assembly tasks. By considering both the viewpoint of developers/users and the scientific principles underlying manufacturing tasks in this comprehensive map, the usability and effectiveness of the final AR solution are also ensured at an early stage of AR-based application development.As a result, this paper provides a useful system to utilize AR capabilities for more complex-multistep tasks in a standardized way. Thus, more potential development and improvement of AR-based solutions for quality 4.0, virtual metrology, and complex assemblies in an industrial manufacturing context could be holistically established and built.

Abstract: One of the critical process steps in the assembly of integrated circuits is the making of the connection between the silicon chip and the outside world. This is done by a thermo-sonic welding process of sometimes more than 800 copper wires to the aluminum bond pads. The Al-Cu intermetallic compound formed during this process is sensitive for trace amount of chloride from the environment. It is found that Cl-containing microplastics are the source of this chloride and further analyzing these particles helps to identify the origin of these particles.

Abstract: One of the advanced ways of provision of functional properties of interference fit joints is to control contact interaction between mating parts, particularly by assembling with application of anaerobic materials polymerizing in contact area. The main advantage of using anaerobic materials is that this technology allows us to harden different parts of the joints selectively. The purpose of the work is to study the possibility of rational provision of functional properties of interference fit joints by selective hardening in case of assembling with the use of anaerobic materials. Modelling of bearing strength of interference fit joint is carried out according to finite element method, with theory of contact interaction between mating surfaces being used. The results of experimental research are given. Anaerobic material is used as a material for hardening of joints. It was discovered that exploitation load in form of torque or axial force is distributed along the length of interference fit joint rather nonuniformly. To decrease expenses, it is necessary to harden those areas of joint which are located by the side of load application. The way of assembling of interference fit joints by pressing with selective use of hardening material is proposed. The technique of reliable identification of the necessity and the moment to apply anaerobic material while assembling parts was developed. As a result, functional properties of pressure joints are reached the most rational way.

Abstract: Maintenance is a system-specific activity that the purpose of which is to maintain or to increase time, performance and quality of machines and equipment use. The demand for technological equipment is still rising, resulting in often complicated and lengthy repairs. It is necessary to analyze the tools used in the construction of assembly joints and to describe the deficiencies that may occur during assembly. When contacting a material tool using a particular technology and assembly, it is necessary to analyze the impact on the final surface quality of the material.

Abstract: Stress concentration in thread roots and nonuniform load distribution along thread turn are the major disadvantages of bolted joints. Under changing cyclic loads on areas of high stress concentration crack formation and destruction of parts occur. In addition, the fretting corrosion processes activate in the areas of contact between thread turns. The purpose of the work is to increase rupture strength of bolted joints under the action of cyclic forces by decreasing stress concentration and reducing movements in contact zone of mating parts in case of assembly with implementation of anaerobic materials. Modelling of bearing strength of bolted joints is conducted according to finite element method, with theory of contact interaction between mating surfaces being used. The results of experimental research are given. Anaerobic materials which polymerize in area of thread contact of parts are used. It was established that assembly with implementation of anaerobic material allows unloading of thread turns because the part of external load is received by elastic layers of the polymerized anaerobic material. In this case the level and the concentration of stress in thread roots reduce, relative movements are decreased, the joint becomes more rigid and its cyclic robustness grows.

Abstract: In this paper the results of an industrial-based examination (client: Electrolux) is described. The task of the examination was to reduce manufacturing and assembling costs of some products (vacuum cleaners, refrigerators and freezers). In the beginning of this paper a few cost reduction philosophies (TPS, Lean) are shortly introduced. Based on the carried out work, the intervention options were classified into four groups. The paper gives examples for each group. The client required that the quality of the devices should not deteriorate as a result of the interventions. The client requested an “outsider” to explore cost-cutting opportunities. The client has provided us with detailed technical documentation of the equipment and one piece of each type of products (11 different) and we could also see the production of the products in the factory. The main purpose of the work is to show what kind of cost saving opportunities can find an “outsider” in common products.

Abstract: In this paper we propose the gripper handle real-time based embedded system for operating robot manipulator. The general gripper has only a simple function and has also I/O module. Thus general gripper and position based robot controller combination is not suitable for precision process operation, IT assembly process. In order to give various functions and intelligence to the gripper, it is necessary to have an embedded controller that real-time guarantees. The proposed embedded system have five component that handle the pose of the gripper, measure the pose and translation of gripper, motoring the gripping tip, operate the stiffness of the gripper and communicate with Ethernet interface to the external robot controller. The external robot interface parts are supported to communicate with various external robot maker, KUKA, DENSO, ROBOSTAR etc. The validation and functional ability is tested on the LAB environment.

Abstract: Until recently a lack of knowledge and understanding of the structural advantages of aluminium has limited the use of the material in building and construction. Today, advances in engineering and standardization have improved our knowledge of this versatile material and it is becoming more widely accepted in many industries.This paper contains examples of structural applications where aluminum has been selected for bridge construction in Europe: The first project was launched and supported by the E.U. and forms part of the European Cycle Route Network development. The second bridge structure is part of the tourist development program launched by the city of Vitre in France

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.