Abstract: A method for converting blanks by drawing in a tool with a ram, a die and a pressure pad wherein, converted blanks with high dimensional precision can be produced, includes feeding a blank with a plurality of bulges to the tool. In flange regions of the blank the pressure pad is moved in a first process step of the method into a first position, which corresponds to the height of the bulges of the flange region of the blank added to the blank thickness. In the first process step the blank is preformed in the tool using the ram and in a second process step the pressure pad and the ram are moved into the end positions, so that the blank is converted by the ram to the end form and the pressure pad smoothes the bulges of the flange regions of the blank.

Abstract: In a roll-forming machine having pairs of forming roll sets and two first and two second auxiliary shape-forming wheel sets for processing C-shaped component or Z-shaped component, each first auxiliary shape-forming wheel set having, in addition to an upper auxiliary shape-forming wheel, a bottom auxiliary wheel for working with a respective lateral shape-forming wheel to ram each of two sides of a C-shaped or Z-shaped component into a 90° contained angle, and each second auxiliary shape-forming wheel set having, in addition to an upper auxiliary shape-forming wheel, a bottom auxiliary wheel for working with a respective lateral shape-forming wheel to ram each of two sides of a C-shaped or Z-shaped component into a 90° contained angle, so that the operator needs not to shut down the machine or to change or calibrate the machine parts when wishing to change the processing from a C-shaped component processing mode to a Z-shaped component processing mode or from a Z-shaped component processing mode to a C-shaped

Abstract: The present invention relates to a head of crimping pliers for crimping a work piece. The head comprises two inserts. Each insert builds at least two halves of at least two nests for the work piece. The inserts are guided along a guiding axis for a sliding movement between a first and second relative position. The guiding axis is directed transverse to the crimping axis. Two nests built by the halves might be used in one and the same position by moving the inserts from the first to the second relative position.

Abstract: The invention relates to a method for determining shape changes of a workpiece made of steel or a steel alloy due to forming, in which a varnish is applied to the workpiece, the workpiece is formed and then an optical shape change analysis is carried out by measuring the applied varnish. The object of providing a method for determining shape changes of a workpiece made of steel or a steel alloy, said method also being suitable for analyzing the shape change of a workpiece after hot forming, is solved according to the teaching of the present invention in that before the forming of the workpiece a varnish with an Al proportion of more than 30% by weight is applied to the workpiece, the workpiece is heated for forming to a hot forming temperature and the workpiece is cooled after or during the forming.

Abstract: The invention provides a method for producing a pearlitic rail by rough hot rolling and finish hot rolling a billet. In the finish hot rolling, the billet is rolled at a rail head surface temperature in a range of not higher than 900° C. to not lower than the Ar3 transformation point or Arcm transformation point to produce a head cumulative reduction of area of not less than 20%, where the reaction force ratio of the finish rolling is not less than 1.25. The finish hot rolled rail head surface is subjected to accelerated cooling or spontaneous cooling to a temperature of 550° C. or less at a cooling rate of 2 to 30° C./seconds, thereby refining the rail head structure to attain a hardness within a predetermined range, and improving rail wear resistance and ductility.

Abstract: A die 10 has a die case 20 arranged with a pressure receiving surface 22 of a pressure receiving portion 21 facing rearward so as to oppose to an extrusion direction, a male die 30 and a female die 40 mounted in the die case 20. The pressure receiving portion 22 is formed into a rearwardly protruded convex shape. A plurality of metal material introducing portholes 24 are formed in an external periphery of the pressure receiving portion 21. It is configured such that the metal material pressed against the pressure receiving surface 22 is introduced into the die case 20 via the portholes 24 and passes through the extrusion hole 11. B/A is adjusted to 1.8 to 6.0 and D/B is adjusted to 0.15 to 0.4, where “A” is a product circumscribed circle diameter, “B” is a pressure receiving surface external diameter, “C” is a between-hole-wall inlet side minimum thickness size, “n” is the number of the between-hole-walls, and “D” is a between-hole-wall inlet side total thickness size obtained by “C”דn.