The implementation of diverse manufacturing strategies across various products mandates the use of a broad range of materials, each possessing unique traits such as material grade, width, or thickness. In this context, the process of mould replacement in punch press operations emerges as a critical, recurrently undertaken operation.
In a vast majority of stamping firms, a noticeable lack of expertise among operators is prevalent. This deficiency often manifests following mould replacements in punch presses, resulting in NC servo feeder inaccuracies. Novice personnel, unfamiliar with the intricacies of operation, struggle to pinpoint the root cause of these issues, often erroneously attributing them to sudden feeder malfunctions. However, the underlying issue frequently isn’t the feeder itself but rather the aftermath of incorrect debugging post-mould replacement or material-related problems.
To address and resolve these commonplace issues, consider the following structured approach:
1. Adjusting NC Servo Feeder’s Feed Height Post-Mould Replacement
After a mould replacement in the punch press, an improperly re-adjusted feed height can result in NC servo feeder inaccuracies. As each mould possesses unique die heights, the feed height of the NC servo feeder must be accurately realigned to match the new mould’s die height. This alignment ensures consistent, precise feeding.
Remember, while making these adjustments, it’s prudent to match the NC servo feeder’s outlet bracket plane with the lower mould plane, instead of modifying the material level post-feeding. Once the feed height is adjusted, secure the mounting plate fixing screws to prevent loosening that could adversely affect feeding precision.
2. Re-adjusting NC Servo Feeder’s Relaxation Angle (Time) Post-Mould Replacement
The NC servo feeder’s relaxation angle, if incorrectly readjusted post-mould replacement, can also trigger feed inaccuracies. Given the varied stamping processes across different moulds and the diverse duration of mould guide pin insertion into the material hole, the relaxation angle (time) of the NC servo feeder warrants adjustment.
During this process, adjusting the relaxation cam angle of the punch press to relax after the mould guide pin enters the material hole is crucial. The feeder should clamp the material before the mould guide pin exits the material guide hole during the mould’s ascension. For a mechanical strike rod relaxation, the adjustment principle is to start relaxing when the mould guide pin is inserted into the material guide hole.
3. Examining and Resolving Skewness and Tension Inconsistencies Post-Mould Replacement
After a mould replacement, if the NC servo feeder’s feed exhibits skewness or the pressure spring tension adjustment is uneven or improper, this can lead to feed inaccuracy. A thorough inspection and corresponding resolution are essential at this point.
4. Identifying and Rectifying Material Property Issues
If issues arise concerning the material’s properties, such as inconsistent thickness, severe burrs, bending, or if the thickness exceeds the machine’s capacity, the NC servo feeder may experience feed inaccuracy. To address this, consider replacing the material with one that adheres to the standard specifications.
In conclusion, enhancing the efficiency and precision of punch press operations isn’t merely about maintaining the mechanical components in prime condition. It also hinges on the operator’s ability to recognize and rectify issues stemming from mould replacements, NC servo feeder settings, and the quality of materials used. With these steps, manufacturers can ensure optimal operation, leading to greater productivity and reduced downtime.