Лесотехнически Университет

Summary

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.

Summary

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.

Summary

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 Mechanical^â 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.

Summary

Joints made with staples and gusset plates are widely used in the wood frame construction of various types of furniture, due to the quick and easy production and the availability of simple technology. In this regard, their good knowledge of bending loads would help furniture designers in the design process. The investigation aims to summarize the data from the specialized literature on the values of parameters characterizing the behavior of joints with staples and gusset plates of details in wood frame, as well as to establish the influence of some key factors such as the detailed thickness, the angle between wood details of the joints, thickness and type of material of the gusset plates on their strength and stiffness under bending load.