Mold Fastening Device Torque Control via Position-Dependent Acceleration
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing mold fastening devices inefficiently utilize the drive motor's maximum torque, leading to prolonged times for opening and closing metal molds due to varying acceleration and deceleration rates based on the movable die plate's position, causing the motor to operate outside its optimal torque range.
Innovation Solution
A mold fastening device with a toggle mechanism and a drive motor control system that adjusts the acceleration and deceleration rates of the cross-head in accordance with its position, ensuring constant output torque and efficient motor utilization by reading and applying specific rates of increase or decrease in rotational speed, allowing the movable die plate to be accelerated or decelerated at a constant rate regardless of its position.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the rotational speed of the drive motor is increased or decreased at a constant rate, then the control system is simple, but the drive motor operates outside its maximum torque range and the opening/closing time is prolonged
Solution Approach 1:
The control system dynamically adjusts the rotational speed of the drive motor based on the real-time position of the movable die plate. The acceleration and deceleration rates are not constant but are continuously modified according to position feedback, allowing the motor to operate within its optimal torque range throughout the motion cycle, thereby reducing the overall opening and closing time.
Solution Approach 2:
A position detection device monitors the position of the movable die plate and feeds this information back to the control device. The control device uses this feedback to calculate and adjust the required rotational speed at each position, ensuring the motor operates at maximum torque points. This closed-loop feedback system optimizes the speed profile to minimize cycle time while maintaining motor efficiency.
2Ease of manufacture
If the rotational speed of the drive motor is increased or decreased at a constant rate, then the control method is straightforward, but the ability of the drive motor is not effectively utilized
Solution Approach 1:
The control system changes the operational parameters (rotational speed, acceleration rate) of the drive motor based on the position parameter of the movable die plate. By continuously adjusting these parameters according to position feedback, the motor is kept within its optimal performance range, maximizing its utilization efficiency and power output throughout the entire motion cycle.
Solution Approach 2:
The control method transitions from a static, constant-rate approach to a dynamic, position-dependent approach. The acceleration and deceleration rates are no longer fixed but are continuously adapted based on the motor's torque characteristics and the current position in the motion cycle, thereby fully utilizing the motor's capabilities.
3Speed
If the movable die plate is accelerated or decelerated at different rates depending on position, then the motor operates at constant speed changes, but the acceleration is lower than maximum and time is lengthened
Solution Approach 1:
The position detection device provides continuous feedback on the movable die plate's position, enabling the control device to adjust the rotational speed profile in real-time. This feedback mechanism allows the system to accelerate and decelerate at optimal rates at each position, ensuring the motor operates at maximum torque points rather than using fixed, suboptimal acceleration rates.
Solution Approach 2:
The control system dynamically changes the acceleration and deceleration parameters based on position. Instead of using constant acceleration rates, the system adjusts these parameters continuously to match the motor's torque capabilities at each position, thereby achieving maximum acceleration throughout the cycle and minimizing total operation time.
Data Source
AI summary
A mold fastening device has a fixed die plate, a rear plate, a movable die plate that can move back and forth, a toggle mechanism, and a drive motor that drives a cross-head. The position where the cross-head should be stopped is associated with the rate at which to accelerate the cross-head from that position or the rate at which to decelerate the cross-head to that position. The cross-head is operated at an acceleration that corresponds to that position. The drive motor is thereby driven at a constant output torque, regardless of the position of the movable die plate. Further, the time for opening and closing metal molds can be shortened.