Abstract: The invention relates to electrical discharge milling machines using tool electrodes subject to longitudinal wear. The inventive discharge milling machine is equipped with a numerical controller executing at least one control cycle for compensating the wear considering the following steps: (a) determining the volume Q eroded by each discharge, (b) calculating the distance s travelled by the tool from one effective discharge to the next, (c) calculating the actual eroded linear volume M [m3/m] for at least one effective discharge, M forming a measurement sample from the values Q and s, (d) comparing said sample M with the corresponding set value C to generate an error D=C?M [m3/m], and (e) calculating and transmitting a command by the numerical controller intended to reduce this error D during the following cycle or cycles.

Abstract: The invention relates to electrical discharge milling machines using tool electrodes subject to longitudinal wear. The inventive discharge milling machine is equipped with a numerical controller executing at least one control cycle for compensating the wear considering the following steps: (a) determining the volume Q eroded by each discharge, (b) calculating the distance s travelled by the tool from one effective discharge to the next, (c) calculating the actual eroded linear volume M [m3/m] for at least one effective discharge, M forming a measurement sample from the values Q and s, (d) comparing said sample M with the corresponding set value C to generate an error D=C?M [m3/m], and (e) calculating and transmitting a command by the numerical controller intended to reduce this error D during the following cycle or cycles.

Abstract: A method and machine to allow for the spark-erosion machining of parts, in particular their finishing, using cylindrical or tubular tools by successive layers.

Abstract: Spark-erosion machining method and machine implementing a machining gap, a process regulator, a numerical control system, a Nominal Trajectory. The latter describes the movement of the tool electrode relative to the part as it ought to proceed if no disturbance were to occur during the machining. Information contained in the Nominal Trajectory is used to define at least two control vectors Vg, Vp which orient, within the coordinate system XYZ, two independent regulation movements. The first, or Gap Vector Vg, defines the direction in which a first regulation movement of the axes of the machine must be performed to maintain the removal of material. The second, or Position Vector Vp, defines the direction in which a second regulation movement of the axes of the machining machine must be performed to correct a tool electrode position error. The respective amplitudes of the regulation movements are calculated in real time by the process regulator.

Abstract: A coiler spindle for winding a band-type product such as the material coming from a continuous casting machine which includes a central shaft rotatable about an axis and having a set of adjacent segments surrounding the shaft. Each segment is mounted to slide radially on the shaft and comprises a curved plate having an external face in the shape of a cylindrical sector. The diameter of the spindle can be changed by radial displacement of the segments. Cooling of the segments is provided by the circulation of a heat exchanger fluid along each segment from a fluid box fixed to the central shaft and having at least two separate chambers. The chambers including a supply and an evacuation chamber. Each segment is provided with its own individual cooling down system arranged within the curved plate. Each individual cooling down system includes an inlet orifice connected to the supply chamber and an outlet orifice connected to the evacuation chamber.