Servo Press Controller Dynamic Stop Time Adjustment
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Solution Overview
Problem
Servo press machines face a trade-off between achieving high finishing accuracy and shortening cycle time, as increasing the bottom dead center stop time improves accuracy but lengthens the machining cycle, reducing production efficiency.
Innovation Solution
A control device and method for a servo press machine that includes a servo motor, position detector, and load detector, with a controller that dynamically adjusts the bottom dead center stop time based on load convergence detection, allowing for precise control of the slider's lowering, stopping, and raising operations to ensure accurate deformation and efficient processing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the bottom dead center stop time is increased to improve finishing accuracy, then the deformation of the workpiece is completed more thoroughly, but the cycle time of machining increases and production efficiency decreases
Solution Approach 1:
The patent applies dynamics by making the bottom dead center stop time variable rather than fixed. The control device dynamically adjusts the stop time based on real-time load detection and convergence determination, allowing the system to adapt the stopping duration to actual working conditions, thereby resolving the contradiction between maintaining sufficient deformation time for accuracy and minimizing cycle time for productivity
Solution Approach 2:
The patent implements feedback through a load detector that continuously monitors the load on the material during the stopping operation. The controller uses this feedback to determine whether the load has converged to a stable value, and only then proceeds with the raising operation. This feedback mechanism ensures that the stop time is precisely controlled - long enough to complete deformation when needed, but not excessively long when deformation is already complete, thus balancing finishing accuracy and production efficiency
Data Source
AI summary
Provided are a control device, a control method, and a control program, which are able to reduce cycle time as well as to ensure the finishing accuracy of a product in a servo press machine. When a load detection result from a load detector (15) is used to determine that the load acting on a material is in a converged state during a stopping operation for stopping a slider (11) at a bottom dead center position, a controller (5) carries out a raising operation for raising the slider (11) from the bottom dead center position.