Servomotor Control Device for Riveting Pressure Stability
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Solution Overview
Problem
In riveting machines, existing servomotor control devices face challenges in maintaining consistent pressure during the riveting process and preventing the object from following the movement of the riveting head after pressure application, leading to inefficiencies in the riveting process.
Innovation Solution
A servomotor control device that includes a first position detection unit, a pressure detection unit, and a speed command limiting unit to control the servomotor, ensuring steady pressure application and preventing the press supporting unit from moving with the riveting head after pressure is applied, by generating and limiting speed commands based on actual positions and pressures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the supporting unit follows the riveting head movement after contact to maintain pressure, then pressure control responsiveness is improved, but the object may be displaced when the riveting head moves away
Solution Approach 1:
The control device preemptively switches from position control to pressure control when the riveting head contacts the rivet, and then to position control when the riveting head moves away. This preliminary switching prevents the supporting unit from following the riveting head after contact, thereby preventing object displacement while maintaining pressure control responsiveness during the actual riveting process
Solution Approach 2:
The control method dynamically switches between position control and pressure control based on the operational phase. During riveting, pressure control is applied to maintain responsive pressure adjustment. After the riveting head moves away, position control is applied to prevent the supporting unit from following movement, thus preventing object displacement. This dynamic switching resolves the contradiction between maintaining pressure responsiveness and preventing harmful displacement
2Productivity
If the supporting unit quickly returns to standby position after riveting, then productivity is improved, but pressure stability during riveting may be compromised
Solution Approach 1:
The control device applies different control methods at different periods of the riveting cycle. During the riveting period, pressure control is applied to maintain stable pressure on the object. After riveting completes and the riveting head moves away, position control is applied to quickly return the supporting unit to standby position. This periodic switching of control methods achieves both pressure stability during operation and high productivity during transition phases
Data Source
AI summary
A servomotor control device in a processing machine that processes an object to be processed on a press supporting unit driven by a servomotor includes: a pressure detection unit configured to detect an actual pressure applied on the object to be processed; a pressure command generation unit configured to generate a pressure command that commands a pressure that the object to be processed preferably receives; a pressure control unit configured to generate a speed command for the servomotor on the basis of the pressure command generated by the pressure command generation unit and the actual pressure detected by the pressure detection unit; and a speed command limiting unit configured to limit the speed command generated by the pressure control unit using a predetermined value.