Servomotor Press Control for SPM Limits
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Solution Overview
Problem
Press devices using servomotors face challenges in ensuring compatibility between different motion types, such as rotational, pendulum, and reverse motions, which affects molding accuracy and energy efficiency, as the maximum Stroke Per Minute (SPM) may be exceeded, potentially damaging the device.
Innovation Solution
A press device with a control system that allows selective operation in either a productivity priority mode, where the press speed is limited to avoid exceeding the maximum SPM, or a moldability priority mode, where stop time is set for the servomotor to maintain molding accuracy without exceeding SPM, enabling energy savings and accurate molding.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the press device executes pendulum motion or reverse motion with short stroke height to shorten cycle time, then productivity is improved, but the maximum SPM may be exceeded and the device may be damaged
Solution Approach 1:
The control device dynamically adjusts the press speed limit value based on the selected motion type (rotational, pendulum, or reverse motion). When pendulum or reverse motion is selected, the system automatically sets an appropriate speed limit that prevents exceeding maximum SPM while still allowing shortened cycle times, thus maintaining both productivity and device safety.
2Manufacturing precision
If the press device executes movement along rotational motion to ensure molding accuracy, then manufacturing precision is improved, but acceleration/deceleration of servomotor increases and power consumption increases
Solution Approach 1:
The control device allows selection of different motion types (rotational, pendulum, reverse) and automatically adjusts the press speed limit parameter accordingly. When pendulum or reverse motion is selected, the system sets a speed limit that enables the servomotor to operate with reduced acceleration and deceleration compared to rotational motion, thereby lowering power consumption while maintaining adequate molding accuracy through controlled speed parameters.
Data Source
AI summary
The press device is a press device configured to press a workpiece, and includes a slide, a bolster, a servomotor, and a control section. The slide is movable. The bolster is placed to face the slide. The servomotor drives the slide. The control section is configured to be able to execute selectively either the productivity priority mode of setting a limit value slower than the maximum press speed of the press device to the press speed when performing a pendulum motion or a reverse motion, or the moldability priority mode of setting a stop time to the servomotor without setting the limit value.