Nippei Toyama Corporation

Sadatsune Ammi

Hiroyuki Uchida

A locking mechanism of a linear motor travel slider, includes: a serration member having a teeth portion and disposed on one of the bed and the travel slider extending in a slider-traveling-direction; a bracket supported by the other of the bed and the travel slider; an actuator supported by the other of the bed and the travel slider; a locking member supported by the actuator having a teeth portion engageable with the teeth portion of the serration member; and a controller for controlling the actuator to retain the lock member in an unlocked position when the linear motor is energized and for stopping the actuator when the linear motor is in a stop state due to a power failure. The locking member includes an urging member for making the locking member engage with the serration member while the actuator is in a stop state.

Locking mechanism of linear motor travel slider and processing machine

The method for detecting any clamping malfunction of the work within the machine tool which clamps both ends of the work with clamping mechanismsof a pair of headstocksand processes the work by spinning the work through synchronous rotation of main spindlesof the pair of headstocks by servomotorswherein, after clamping the both ends of the workwith the clamping mechanismsof the respective headstocksand while both the servomotorsof the headstocks are in a servo-ON state, a command for a minute angle &#x3b1; rotation is given to the servomotorof only one of the headstocks, and at this point, any malfunction in clamping is determined when a current or torque generated within the servomotor of one or the other of the headstocks is smaller than a predetermined value.

Method for detecting malfunction in clamping and machine tool

A control devicecontrols the grinding processing at a processing portion of a work W so as to shift to the last precision grinding step from a rough grinding step through a middle grinding step and a finishing grinding step. When the grinding in each step is carried out, two processing portions are measured, and then, it is determined whether or not one or both measurement values attain to a predetermined value that has been determined in advance when each step is finished. When a processing time difference t is generated between the processing portions, by increasing or decreasing the feeding amount per unit time in a next step, the processing time difference is eliminated. Thereby, the finishing grinding step just before the last steps of the both processing portions are simultaneously finished.

Many-headed grinding machine and grinding method using many-headed grinding machine

A machining controlling apparatus numerically controls a wheel spindle stock and a spindle apparatus, and performs the machining operation of a workpiece by a grinding wheel. When a power failure has been detected by a power-failure detecting unit, a grinding machine is stopped after the grinding wheel is retreated from the workpiece within a very short period until the controlling operation by the machining controlling apparatus becomes impossible.

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Toyama, Japan

Sadatsune Ammi