Die Cushion Apparatus Parallel Control via Multi-Shaft Segmentation
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Solution Overview
Problem
Conventional die cushion apparatuses experience instability and material rupture due to drastic inclination of the cushion pad during die cushion force control, leading to unbalanced die cushion forces and poor formability, especially when dealing with varying die and material dimensions.
Innovation Solution
A die cushion apparatus with an information acquiring device to monitor and adjust the inclination of the cushion pad, utilizing separately-controllable multiple driving shafts and a controlling device to maintain the cushion pad in a parallel position with the dies, ensuring smooth die cushion action and enhanced formability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If die cushion force control is performed using conventional single driving shaft, then the cushion pad follows the slide inclination, but the cushion pad becomes drastically inclined causing unbalanced die cushion forces and material rupture
Solution Approach 1:
The single driving shaft is segmented into multiple driving shafts (first and second driving shafts) that can be independently controlled. This segmentation allows each shaft to independently adjust its position, enabling the cushion pad to maintain parallelism with the dies even when the slide is inclined, thereby preventing unbalanced die cushion forces and material rupture.
2Stability of the object's composition
If multiple driving shafts are used with separate control, then the cushion pad inclination can be controlled, but the device complexity increases
Solution Approach 1:
A feedback control system is implemented where the control unit receives position information from both driving shafts and automatically adjusts their positions to maintain parallelism between the cushion pad and dies. This feedback mechanism simplifies the operation despite having multiple driving shafts, as the control unit autonomously manages the complexity of coordinating multiple shafts.
3Ease of manufacture
If the cushion pad is held parallel to the slide, then the setup is simple, but the die cushion forces become unbalanced causing poor formability
Solution Approach 1:
The cushion pad positioning system transitions from a static parallel alignment to a dynamic adjustable system. The multiple driving shafts enable the cushion pad to dynamically adjust its orientation to match the die inclination, ensuring balanced die cushion forces are applied throughout the forming process, thereby improving manufacturing precision while maintaining ease of operation through automated control.
Data Source
AI summary
According to the die cushion apparatus of a press machine and the die cushion controlling method of the present invention, in holding the cushion pad on standby at a desired standby position, it is possible to hold the cushion pad on standby in parallel with the lower faces of the dies mounted to the slide, and if the lower faces of the dies are inclined, it is possible to hold the cushion pad on standby in the state of being inclined. Through this configuration, it is possible to easily allow the material to come into contact with the lower faces of the dies from the beginning of the die cushion force control (beginning of the collision), and also possible to smoothen the die cushion action in the plane, thereby enhancing the formability.