摘要:
A profile control apparatus which prevents overcutting by a cutter at a corner portion by moving a tracer head ahead of the cutter. An instruction value Su or Sw proportional to the change quantity of a speed instruction value Vx or Vy for each axis obtained on the basis of the displacement quantity εx, εy, εz in the direction of each axis detected by the tracer head is calculated by an operational unit (18u, 19u, 18w, 19w), and a U-axis motor and a W-axis motor for moving only a model in the direction of each axis are driven by use of each instruction value Su or Sw as a moving distance. A sub-table for supporting only the model is disposed on a main table of a profile machine tool and this sub-table is moved ahead of the main table supporting thereon a work, by the U-axis motor and the W-axis motor by a distance corresponding to the instruction values, Su, Sw corresponding to the delay of the servo system.
摘要:
A copying-speed control method for an NTC copying which performs profile control of one axis and numerical control of the other two axes. In the servo loop of the numerical control axis, an override control circuit (23) is provided between an error counter (22) and a D/A converter (16x). When a displacement changes abruptly the override value of the override control circuit is changed to stop or reduce the servomotor output of an error quantity in the error counter (22). Thereby, the biting at sudden changing parts of a model is reduced.
摘要:
A profile control apparatus which prevents overcutting by a cutter at a corner portion by moving a tracer head ahead of the cutter. A first delay speed instruction V xm or V zm is determined by a first delay circuit (14a or 14c) having a time constant and a second delay speed instruction is determined by a second delay circuit (14b or 14d) having a time constant different from that of the first delay circuit for each speed instruction V x , V z for each axis determined on the basis of the displacement quantity ε x , ε y , ε z in the direction of each axis detected by the tracer head, and the difference V xs or V zs between the first and second delay speed instructions is calculated. An X-axis main motor and a Z-axis main motor are driven by the first delay speed instructions to operate the machine as a whole, and an X-axis sub-motor and a Z-axis sub-motor are driven by the differences in parallel with the movement described above so as to move only the tracer head and thereby to move the tracer head ahead of the cutter.
摘要:
An apparatus for controlling profiling is improved so that it is possible to easily vary a reference displacement quantity during machining. A profiling calculation means (2) calculates a profiling rate and a profiling direction on the basis of a displacement quantity detected by a tracer head (1) and the output of an adding means (4). A driving means (3) moves the tracer head (1) and a model relative to each other on the basis of the results of the calculation carried out by the calculation means (2). The adding means (4) adds together a reference displacement quantity stored in a memory (5) and a correction set by a correction setting means (6), and inputs the result of the addition to the profiling calculation means (2).