Pressing Device Impact Reduction via Segmented Deceleration Control
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Solution Overview
Problem
Existing pressing devices fail to sufficiently reduce impact force when a moving pressing unit collides with a contact object, as they cannot be adequately decelerated before contact, leading to potential damage.
Innovation Solution
A pressing device equipped with an actuator, movement quantity detector, and drive device that accelerates the pressing unit to maximum speed, decelerates at a specific position, and switches to thrust control to maintain a constant speed, ensuring controlled deceleration and reduced impact force.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If the pressing unit is decelerated at maximum deceleration from the start position, then the impact force is reduced, but the tact time increases
Solution Approach 1:
The patent divides the deceleration process into two distinct phases: a first deceleration phase at maximum deceleration from the start position to an intermediate position, and a second deceleration phase at a lower deceleration rate from the intermediate position to the target position. This segmentation allows the system to reduce impact force during the critical final approach while maintaining higher speeds earlier in the trajectory, thereby optimizing both impact force reduction and tact time.
2Loss of time
If the pressing unit accelerates again after deceleration, then the tact time is reduced, but the impact force increases
Solution Approach 1:
The patent implements preliminary deceleration action by decelerating the pressing unit at maximum deceleration to an intermediate position before the target position, ensuring that the pressing unit approaches the target at a reduced speed. This preliminary action prevents the need for abrupt deceleration at the moment of contact, thereby reducing impact force while maintaining efficient overall cycle time.
3Productivity
If the pressing unit maintains high speed throughout the movement, then the productivity increases, but the impact force on the pressed object increases
Solution Approach 1:
The patent applies dynamic control by continuously adjusting the acceleration and deceleration rates based on the pressing unit's position in the trajectory. The system transitions from maximum acceleration to maximum deceleration to a second deceleration phase, creating a dynamic speed profile that optimizes both productivity and impact force reduction. This dynamic approach allows high speed maintenance during non-critical phases while ensuring controlled deceleration during the critical final approach.
Data Source
AI summary
This pressing device includes an actuator, a pressing unit provided on a movable element of the actuator, a movement quantity detector for detecting a movement quantity of the movable element and outputting movement quantity information indicating the movement quantity, and a drive device that moves the pressing unit to press a pressed object by supplying a drive current to the actuator based on the movement quantity information. The drive device controls an operation of the pressing unit using position control processing based on current information indicating the drive current and the movement quantity information. When the speed of the pressing unit is decelerated down to a predetermined lower limit speed, the drive device controls the speed of the pressing unit to be constant based on the current information, and when the current reaches a predetermined current value, determines that the pressing operation is performed.