method for anchoring of fasteners in a material with pores or cavities as well as fasteners for anchoring

摘要

A joining pin ( 3.2 ) with which two parts ( 1 and 2 ) made from a porous material, particularly wood or a wood-like material, are to be joined together, is anchored in the porous material at predetermined anchoring points ( 31, 33 ). For this purpose, a bore ( 4.2 ) with a closed inner end ( 41 ) is made in the parts ( 1 and 2 ). The shape of this bore ( 4.2 ) is so matched to the joining pin ( 3.2 ) that it can be introduced substantially without force expenditure into the bore and is positionable in a first position. At least one predetermined anchoring point ( 31, 33 ) between the joining pin ( 3.2 ) and the wall of the bore ( 4.2 ) is formed when pressure is built up by pressing the joining pin ( 3.2 ) with a pressing force (F) more deeply into the bore to a second position. Energy is supplied in a planned manner to the joining pin ( 3.2 ) so that at the predetermined anchoring points ( 31, 33 ) the thermoplastic material of the joining pin ( 3.2 ) is plasticized. The locally plasticized plastic material is pressed by the local pressure into the porous material of the parts and forms local, macroscopic anchors ( 10, 20 ). The joining pin ( 3.2 ) is, e.g., made entirely from a thermoplastic material and the energy for plasticizing is supplied thereto by ultrasonic vibration.