In the JGJ75.1-91 standard promulgated by the Ministry of Construction, the tolerance of the adjacent two threaded holes of the bolt node ball is ±20'. Considering the error accumulation after the porous position indexing, the indexing accuracy of the indexing device must be high. The indexing accuracy is set to ±2'. In order to improve efficiency, the clamping process is carried out in four stages of fast forward, slow forward, clamped, and fast reverse, so that high speed, low speed and speed adjustment requirements are required. The clamping must be stable and reliable, and the clamping force must be constant. The clamping force is too small, the clamp does not tighten the workpiece, and it is easy to loose; if the clamping force is too large, it is easy to cause deformation of the jaws, devices, etc., which will affect the precision support. The lower support claw is controlled by the cylinder, and its function is to install the node. The ball acts as a supporting ball during the ball, and plays a part of the supporting force during processing. When the indexing is retracted to the bottom, the node ball hangs the system, and the CRT display displays the input program and data, and the working process and status. When the work is started by the operation panel start button, the signal is sent to the CNC to call the relevant program through the PLC, after the analysis and decoding operation, the control command is issued, and the U/V axis is realized by the D/A conversion and the servo drive unit driving the servo motor. degree. The minimum resolution of the indexing is 13′′, which satisfies the accuracy requirement of the node ball.
The clamping control circuit wiring is as follows: the X terminal on the left side of the PLC is the input terminal and the input button of the operation panel, and receives the signal of the CNC and the machine control system output communication. The Y terminal on the right side of the PLC is connected to the control terminal, the relay coil and the communication signal sent to the CNC and the machine control system. The left side of the inverter is the input terminal, R, S and T are the 50Hz three-phase power input terminals, and the other is the control terminal. The signal output by the PLC controls the working state of the inverter; the right side of the transformer is the output terminal, U, V, W are After the frequency conversion (1 ~ 200Hz) three-phase power output terminal, to control the MA, MB motor speed control, RUN is the clamping force constant signal output belt end, which can be adjusted by parameter setting and clamping force. The main terminal function of the PLC and the inverter is controlled. When the S switch is turned to the X7 point, it is the manual mode. Press SB1 internal output relay X1 to be electrically closed, so that internal relays Y5, Y3, Y1 are electrically output, relay k5 is energized, inverter STF, RH terminal input signals control A-axis motor MA and jaws fast forward; when jaws When approaching the node ball, the internal timer T01 delays control of Y3 power loss, Y4 powers up, and turns into slow forward; when clamping the node ball, the motor stalls and the current rises to a certain value (and required) The clamping force corresponds to), the RUN output signal is input through the k8 and X13 terminals, and the motor is cut off to complete the clamping and self-locking by the lead screw and the harmonic reducer. When loosening, press SB2, X2 is energized, so that Y5, Y3, Y2, electric output, relay k5 is energized, inverter STF, RH terminal input signal controls A-axis motor MA and jaw retract; rewind The distance can be controlled by the timer T02 delay. The clamping release of the B-axis is controlled by the SB3 and SB4 buttons, and the process is similar to the A-axis. SB5 and SB6 are manual controls for cylinder lift. SB8 is the stop button.
Application example The indexing clamping device is installed on the ZH5132 vertical machining center for joint control. The ball is automatically formed on 120mm, 9 threaded holes, 40mm hole end platform, thread M20mm, hole depth 30mm, bottom hole depth 40mm. Processing takes only 20 minutes to complete. The processing process is stable and reliable, and the accuracy is stable.
Conclusion (1) The indexing system adopts CNC control to improve the resolution and indexing accuracy; (2) The clamping system adopts PLC and inverter control to easily complete fast forward, slow forward, clamp and rewind; clamping force Constantly adjustable, clamping speed is adjustable; (3) Automatic control and manual control through PLC ladder diagram programming; (4) Indexing device control system can easily communicate with machine tool control system to achieve joint control, real-time performance, Stable and reliable.
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