Press Die Positioning During Continuous Operation Under Thermal Drift
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Solution Overview
Problem
Conventional pressing machines face inefficiencies due to thermal expansion of press dies, leading to changes in workpiece thickness, position, and shape, resulting in rejects and requiring cumbersome adjustments to maintain production quality.
Innovation Solution
A pressing machine equipped with a die positioning system and position adjustment mechanism using a servomotor, allowing continuous operation by adjusting the press die position without interrupting the process, ensuring accurate positioning even during thermal changes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the pressing machine operates continuously without stopping, then production efficiency is improved, but the press die position drifts due to thermal expansion causing workpiece quality degradation
Solution Approach 1:
The die position is adjusted in advance during periods when reaction force is not applied (between press working cycles), so that the die is already positioned correctly before the next press working operation begins. This preliminary adjustment prevents quality degradation without requiring production stoppage.
Solution Approach 2:
The die position adjustment mechanism is designed to be dynamically adjustable during operation. The position can be changed in real-time based on thermal expansion effects, allowing the system to adapt to changing conditions while maintaining both continuous production and workpiece quality.
2Manufacturing precision
If the press die position is adjusted manually to maintain workpiece quality, then manufacturing precision is improved, but production efficiency decreases due to stopping and manual intervention
Solution Approach 1:
The system automatically adjusts the die position based on feedback from position detection, without requiring manual intervention. The adjustment mechanism serves itself by detecting position drift and correcting it automatically during non-working periods, maintaining quality while preserving continuous production.
Solution Approach 2:
A position detection mechanism monitors the die position continuously, and this information is fed back to the adjustment mechanism. When position drift exceeds a predetermined threshold, the system automatically initiates correction, creating a closed-loop control system that maintains precision without manual intervention.
3Manufacturing precision
If the press die position is adjusted during press working, then workpiece quality is maintained, but the adjustment mechanism must withstand reaction force making the structure more complex
Solution Approach 1:
All position adjustments are performed in advance during periods when reaction force is not applied to the die. This eliminates the need for the adjustment mechanism to withstand high reaction forces during press working, allowing for a simpler, more reliable design.
Solution Approach 2:
The system proactively adjusts the die position before thermal expansion or position drift affects workpiece quality. By anticipating and correcting position drift before it causes problems, the system maintains quality without requiring a complex mechanism designed to handle corrective forces during high-stress operations.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This solution enhances production efficiency by allowing for real-time correction of die positions without manual intervention, maintaining product quality and reducing manufacturing costs by preventing rejects during continuous operation.
Implementation Method 1
a position adjustment mechanism that has a servomotor as a drive source and optionally changes a position where the press die is positioned
Data Source
AI summary
A pressing which a ram repeats an up-and-down motion for press working machine that performs a continuous operation in by a press die held by a die holding portion of a bolster and a die holding portion of the ram includes: a die positioning portion that positions the press die in a first direction being a moving direction of the ram; a position adjustment mechanism having a servomotor as a drive source and optionally changing a position where the press die is positioned by the die positioning portion; and a drive control unit driving, when position change data is given during the continuous operation, the servomotor such that the position where the press die is positioned by the die positioning portion is changed to a position corresponding to the position change data when reaction force of the press working not applied to the die positioning portion during continuous operation.