Punching of Solid and Derived Timber Products-an Alternative Production Process to Drilling
Nowadays drilling is one of the most important production processes in industrial wood machining. But this process step limits the output of flow processing machines because the workpieces have to be stopped to create the drillings etc.at relatively low feed speeds. An essentially increased efficiency by the improvement of conventional drilling devices, e.g. increasing the rotation-speed of the spindles or the acceleration of the axes, will only be possible to a limited extent under technological as well as economical aspects.The disadvantages of the conventional technology shall be avoided by the development of an alternative production process, by which blind holes into wooden workpieces can be punched. Especially for machining of fiber-and particleboard,which are typical materials in industrial furniture production, very good results could be achieved in the laboratory.Current research activities also deal with the punching of solid wood.Further,the manufacturing of alternative hole geometries for different fittings and assembly systems of furniture industry is examined.The special characteristic of the developed process for hole punching consists in the very simple kinematics. By a pure translational movement the thin-walled hollow tools are pressed into the workpiece till the desired hole depth is reached. Depending on the feed speed, separating or cutting of the material follows.Because of the displacement of cut material through the tool,the punching core (oddment) is sheared off from the bottom of the hole. The core which is pressed into the tool can be ejected over the return stroke by the help of a stationary ram.The punching process takes place without any dust or chip development and no pollution of the working environment.The oddments can easily be removed from the working area.A main point of the investigation consists in finding the connection between punching speed (feed speed), punching force (process force) and hole quality.The primary aim is to get minimum forces at maximum qualities. Therefore several experimental setups have been developed, which enable punching with speeds of 0.001 m/s up to 150 m/s and resultant different punching energies.
drilling furniture production production process punching wood machining
Hans-Werner Hoffmeister Torsten Loohss
国际会议
19th International Wood Machining Seminar(第19届国际木材机械加工研讨会 IWMS19)
南京
英文
56-63
2009-10-21（万方平台首次上网日期，不代表论文的发表时间）