Technologia i Automatyzacja Montażu (Assembly Techniques and Technologies)

A proposal for a new method of testing the impact strength of adhesive joints

Jan Godzimirski — 2024-09-30

The usefulness of the proprietary method of testing the impact strength of adhesive joints under shear loads was checked. An adhesively bonded lap sample of flat bars with a thickness of 5 mm, loaded on the side surface of the overlap, was proposed. Numerical calculations have shown that in such a loaded lap joint, shear stresses dominate. Impact tests of such specimens can be performed on conventional Charpy hammers. The conducted experimental tests showed high reproducibility of the results of such tests and as expected, higher destruction energy of flexible adhesive and adhesive layers of greater thickness was obtained.

Horizontal laminar flow cabinet with a low background and clean air

Tomasz Samborski — 2024-09-30

The publication presents the design, construction of a prototype, and the course of verification tests of a special horizontal laminar flow cabinet made entirely of plastics. In the cabinet design process, numerical simulations and airflow analyses were used to achieve a laminar, uniform flow in the device's workspace. A prototype was built and subjected to verification tests regarding the intensity and nature of airflow as well as air cleanliness. The cabinet is equipped with its own filtration-ventilation module providing clean air to the workspace and removing used air to the external ventilation system. It ensures an increased level of protection for workers dealing with microorganisms and hazardous airborne chemicals, as well as complete corrosion resistance inside the workspace. A particular area of application for the cabinet is research involving radionuclides, volatile, toxic chemical compounds for which air-recirculating devices cannot be used in the room where they are placed. The developed solution has been protected by industrial property rights and used to implement a contract for the supply of a set of equipment to the laboratory of the Institute of Nuclear Physics of the Polish Academy of Sciences.

Accuracy of assembly holes after drilling in Al/CFRP layered structure

Elżbieta Doluk — 2024-09-30

Layered structures consisting of CFRP composites and aluminum alloys are most commonly used in the aerospace, marine, construction and automotive industries. One of the most important aspects associated with their use is the difficulty of machining them due to the anisotropic nature of the structures. These structures are often jointed to each other by mechanical joints that require mounting holes. The purpose of this study was to determine the effect of drill bit diameter, cutting speed and the way the specimen is clamped during machining (drilling strategy) on the quality of holes drilled in a II-layer structure consisting of CFRP composite and aluminum alloy. The quality of the holes was expressed by the hole accuracy index D. A visual evaluation of the holes after the drilling process was also carried out.

Design for Assembly: Wrist Orthosis Design Concepts Proposals

Abigail Machaj — 2024-09-30

This study investigates the integration of modern engineering techniques, including 3D scanning and additive manufacturing, in the design and production of wrist orthoses. The research aims to enhance orthotic devices by proposing three innovative fastening methods - Velcro straps, screws, and magnets - designed for use with 3D-printed orthoses. The study outlines the entire process from patient hand scanning to the final orthosis creation, emphasizing the precision and customization afforded by these advanced technologies. The proposed designs are intended to improve the comfort, effectiveness, and usability of orthoses for patients with musculoskeletal dysfunctions. The findings demonstrate the potential for significant advancements in personalized medical devices, offering new avenues for rehabilitation and patient care.

Jet engine - construction and modern development examples

Arkadiusz Garwol — 2024-09-30

The article presents the construction and operating principle of a turbine jet engine. The basic types of engines of this type are presented, such as single-rotor single-flow jet engines, single-flow dual-rotor engines (which are another development version of single-rotor engines, as well as dual-flow engines which are currently most commonly used in passenger aviation, and contra-rotating propeller engines and turbine propeller engines. Also presented their applications, such as propulsion of various types of. In the further part
of this paper, the development trends of turbine jet engines are described, based on patents that have been granted in recent years. One of the cited patents is the use of a fuel cell to power an electric motor used to start a turbine jet engine. Also presented the concept of an electric motor providing propulsion of aircraft. An engine of this type is devoid of a turbine and a combustion chamber, and the machine shaft rotates only using electricity.

Modular technological line for assembling and testing car dampers

Bartłomiej Juszczyk — 2024-09-30

This publication describes the effects of work on the project no. POIR.01.01.01-00-1029/17-00. Its aim was to develop and demonstrate a technological line for the assembly and testing car dampers. The implementation of the project results took place in the own activities of ELPLC S.A. under Priority Axis I, the Smart Growth Operational Program 2014-2020 - Support for R&D work by enterprises. The commencement of work on the project was also the result of direct experience in the construction of machines and lines for OEM and Tier1 automotive industry clients.