4. Motion Control Instructions 4.7.9. Control feature of flying shear function Flying shear is a kind of special e-cam function. In continuous shearing, the flying shear curve for the first cycle is shown below. Return area SlaveEndPosition Acceleration area SlaveSyncPosition SlaveWaitPosition Master axis Explanation of areas Acceleration area: After the flying shear relation is established successfully and when master axis runs to MasterStartPosition, slave axis starts to accelerate from static state and finally slave axis and master keeps the synchronous speed. The process is named as the Acceleration area. Sync area:
In this area, slave axis and master axis run at the fixed speed ratio (1:1 usually). And the cutting of material occurs in this area. Return area: After the Sync area finishes, slave axis starts to decelerate and finally slave axis rotates reversely to the SlaveWaitPosition and then stops. The process is named as the Return area. Steps for flying shear 1. After the flying shear function is started up, slave axis runs to the SlaveWaitPosition and stops there. 2. When master axis runs to the MasterStartPosition, slave starts to chase after master axis and the flying shear function enters the acceleration area. 3.
When the sync area starts, master axis is in the MasterSyncPosition and slave axis is in the SlaveSyncPosition. Meanwhile, slave axis and master axis keep the synchronous speed and the synchronous bits of relevant instructions turn on. 5. When slave axis reaches the SlaveEndPosition, the synchronous area ends and the sync bit is reset. Meanwhile, slave axis starts to decelerate and the flying shear function enters the return area. 4. The shear axis will run according to user program after the sync bit is on 6. In the end, slave rotates reversely to the SlaveWaitPosition. Function feature 1. User could set up the cutting length freely according to the technological requirement 2.
User could set up the position and length of the sync area freely according to the technological requirement 3. In sync area, slave axis and master axis run at the fixed speed ratio (speeds are same usually). And the cutting of material occurs in this area. 4. After the flying shear function is started up, slave axis runs following the phase of the master axis. Therefore, master axis could move at a constant speed, acceleration, deceleration and irregular speed. 5. After flying shear function ends, slave axis will still return to the SlaveWaitPosition. DVP-MC operating manual 4-173 Slave axis Sync area MasterSyncPosition MasterStartPosition CutLength CutLength