Marposs Societa' Per Azioni

Finike Italiana Marposs-soc. in Accomandita Semplice Di Mario Possati &

Finike Italiana Marposs-soc. in Accomandita Semplice Di Marlo Possati &

Mario Pozzetti

Domenico Malpezzi

Roberto Rossi

Apparatus for the dynamic balancing of a rotating body

The machining of mechanical pieces in a grinding machine is controlled depending on in-process and post-process measurements of the pieces. The post-process measurement is carried out by using the same in-process measurement means, with the provision of different zero references for the two types of measurements.

Method and relevant apparatus for controlling the machining of

Method for controlling the machining of mechanical pieces

A method for controlling and regulating the working cycles of a machine tool on a workpiece, including the steps of measuring the workpiece during the machining and programming the feed speed of the tool depending on another variable quantity, which foresees generating a signal responsive to the elastic strains suffered, during the machining, by the kinematic chain comprising the workpiece and the tool, as a consequence of the tool thrust. The signal is used for controlling the feed speed. An apparatus for controlling and regulating the working cycles of a machine tool including a measuring device for the measurement of the sizes of the workpiece being machined, a stepping motor, a digital counter, a digital analogue converter and adapter responsive to the position of the tool relative to a reference position, a differential amplifier, a program unit for programming the feed speed of the tool and a control unit for varying the feed speed. The stepping motor, digital counter, digital analogue converter and adapter responsive to the position of the tool and the measuring device are connected to the differential amplifier adapted to provide a signal responsive to the elastic strains suffered, during the machining, by the tool, workpiece and kinematic chain, due to the tool thrust. The output of the differential amplifier is connected to the program unit for varying the feed speed of the tool depending on the elastic strains.

Method and relative apparatus for controlling and regulating the working

The invention relates to logic systems used for controlling industrial processes and consists in a monitoring apparatus for checking the regularity of the operation of a logic system, in order to increase its safeness. The apparatus comprises a source of a clock signal, a series of comparison units for comparing logic signals, a detecting device including a counter for checking the presence of the clock signal at the output of the series of comparison units, a checking system means for simulating an alarm state and consent system for making the operation of the logic system depend on the working conditions of the monitoring apparatus. The invention is particularly useful for increasing the safeness of the operation of logic systems for machine tools.

Monitoring apparatus for checking the regularity of the operation of

An apparatus for controlling a machine tool which includes a measuring head for measuring a dimension (i.e. a diameter) of a workpiece, a detector for detecting and holding the maximum dimension measured by the measuring head, a circuit for determining the mean dimension of a plurality of measurements, a circuit for determining the dispersion between the measured dimensions and the mean, and a counter for inhibiting the control operation until a predetermined minimum number of workpieces have been measured.

Control device for a machine tool

Apparatus for checking the cutting capacity and controlling the dressing of a grinding wheel comprising a device to measure the sizes of the pieces being machined, a threshold unit connected to the output of the device responsive to the device, a processing group containing an integrating and memory circuit to integrate and store signals for every piece being machined, a switch associated with the integrating and memory circuit and controlled by the threshold unit, a threshold circuit the input of which is connected to the switch and the output to the processing group and a threshold device to control dressing of the grinding wheel connected to the output of the processing group. The apparatus may include a program unit to set the values of the feed speed of the wheelhead, a unit to calculate stock removal speed and a unit to compare stock removal speed with programmed speed.

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Bologna, Italy

Mario Pozzetti