1. Adjustment of basic parameters
1. Feed delay setting
Adjust the "tool feed delay" parameter in the CNC system (0.3-0.5 seconds is recommended) to ensure that the cylinder stops for enough time after feeding to the end, and avoids insufficient chamfer length caused by premature tool retraction.
Verify the rationality of the delay by observing the chip state: if the chip is intermittent, the delay needs to be appropriately increased; If the chips are continuously discharged in a spiral pattern, the parameters are reasonable.
2. The feed speed is matched with the rotational speed
Adjust the ratio of cylinder feed speed to cutterhead speed, and follow the principle of "fast feed with high speed for low hardness materials, and slow feed with low speed for high hardness materials".
Example: When processing aluminum, the speed can be set to 3000rpm and the feed speed is 0.8mm/s; When machining stainless steel, the rotation speed is reduced to 1500rpm and the feed rate is 0.5mm/s.
2. Optimization of the feeding stroke
1. Stroke in place detection
Check whether the cylinder stroke is completely exhausted: Observe the cylinder operation in manual mode, if it is not fully in place, adjust the pressure of the hydraulic system or clean the oil circuit blockage.
By extending the "feed and hold time" (e.g. 0.5 seconds), the cylinder stroke is forced in place to avoid stroke errors caused by pressure fluctuations.
2. Stroke sensor calibration
Adjust the position of the magnetic induction switch at the end of the cylinder to ensure that it can accurately detect the end of the cylinder stroke and transmit the signal to the control system synchronously.
3. Automated process coordination
1. Feeding and processing cycle synchronization
For models equipped with automatic feeding devices, the feeding interval and chamfering cycle need to be matched:
Feeding time ≤ (processing time - retraction time).
Example: If it takes 5 seconds to process a single piece and 1 second to retract, the feeding action needs to be completed within 4 seconds.
2. Multi-station collaborative control
The two-station model needs to set up two sets of cylinders with timing misalignment to avoid hydraulic pressure fluctuations caused by simultaneous feeding. It is recommended that the second station be started with a delay of 0.2-0.3 seconds.
4. Correction of processing time for special materials
1. Viscous material treatment
When processing materials such as nylon and PVC, it is necessary to reduce the feed rate (about 20%-30%) and increase the cooling time to prevent the material from deforming due to friction and heating.
2. Thick-walled/high-hardness workpieces
The "segmented tool feeding" mode is adopted: 70% of the cutting volume is completed in the first feed, and the remaining processing is completed after a short pause (0.1 seconds), reducing the tool load and improving stability.
Summary suggestions
Priority is given to adjusting the feed delay and feeding speed, and the rationality of the time parameters is verified by 3-5 pieces.
During mass production, enable automatic collaborative parameters to control the processing time of a single piece in the range of 3-10 seconds.
Calibrate the cylinder stroke sensor and hydraulic pressure gauge regularly to avoid the accumulation of time errors due to mechanical wear.
