Method of shaping a semi-finished product on a hammer, in particular for producing an aerospace fastener

摘要

The method of shaping on a semi-finished hammer, in particular for the manufacture of air anchorages, consists of the upper (1) and lower (3) matrices having working patterns in the middle (1a and 3a),heated in the kiln and using gas burners to 250oC temperature and placed on a punching hammer with the energy of impact 36 kJ and the mass of the kiln 1000 kg, after which the feed material in the form of a moulded pre-cap cast in sand form with less plastic aluminium alloys of the aluminium-copper group is heated in the kiln in temperature range 460-500-C, preferably 480-C, up to fifty minutes, then the heated input material is placed in the working range (3a) of the lower matrix (3),Then the top matrix (1) moves progressively up to 10 m/s in the direction of the bottom matrix (3) and the input material is crushed with the working pattern (1a) of the top matrix (1) and the working pattern (3a) of the bottom matrix (3) and the semi-finished product (2b) is formed with a greater degree of conversion.