Автор: Nelly Staneva
- INNOVATIONS IN CONCCURENT FURNITURE ENGINEERING
Basic aspects and innovations in concurrent engineering and its major place in the production of furniture in our days are represented. The main advantages and the main differences between concurrent and traditional furniture engineering are analyzed. Examples of using 2D and 3D models made by CAD-based programs in the production of furniture, with the help of CNC machines and 3D printers are considered. The new technology for 3D printing and its using for production of wood elements and furniture are presented, which leads to establishing the idea for „Smart wood materials”. The opportunities to use these technologies to make easier the work of designers and adapt them in everyday life, which make them more available to the customer are discussed.
Ключови думи: concurrent engineering, furniture design, 3D modelling, CAD, 3D printing, “smart wood”
- ADDITIONAL LOAD FROM RADIAL MISALIGNMENT OF SHAFTS AT THEIR COUPLING
A methodology for determining of additional load of shafts from deformation due to radial misalignment at their coupling is proposed. Shafts connected with rigid compensating coupling with cross coulisse (Oldham coupling) and with sleeve coupling are considered. The shafts displacement due to the additional load is determined for two cases: when supports are considered as perfect solid and when supports are considered as flexible with a radial clearance in the bearing. The elastic deformation of coupling sleeve is determined.
Ключови думи: misaligned shafts, coupling, rolling bearing, displacement, strain
- STATIC ANALYSIS OF A UPHOLSTERED FURNITURE FRAME MADE OF SCOTS PINE AND PB WITH STAPLE CORNER JOINTS BY FEM
3D geometric model of one-seat frame for upholstered furniture was created by the CAD system Autodesk Inventor Pro®. A linear static analysis was carried out with CAE system Autodesk Simulation Mechanicalâ by the method of finite elements (FEM) simulating light-service loading of the frame.
The orthotropic material characteristics of pine solid wood (Pinus Sylvestris L.) for the rails and particleboard (PB) for the side plates are considered in the analysis. Corner joints in the framewith staples and PVA glue were considered. FEA was performed with regard to laboratory establishedcoefficients of rotational stiffness of used staple corner joints in the frame – case butt joints and end to face butt joints.
As a result, the most loading construction part of the frame with staple corner joints is established – the rear upper rail of the seat where the maximum values for linear displacements,nodal rotationsand stresses are received due to the nature of the applied loading.
Ключови думи: upholstered furniture frame, staple joints, PB, static analysis, CAE, FEM