Hydraulic Pressurizing Mechanism for High-Cycle Press Molding
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Solution Overview
Problem
Crank mechanisms in press devices face challenges in adjusting and maintaining a precise pressurizing force, requiring large-capacity servomotors and torque for holding the pressurized state, which complicates high-cycle press molding.
Innovation Solution
A press device incorporating a slide with a reciprocating mechanism and a hydraulic cylinder mechanism that allows for precise control of pressurizing force, using a drive unit with a crank mechanism for large strokes and a hydraulic cylinder mechanism for short strokes to maintain a constant pressurized state, eliminating the need for large servomotors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a crank mechanism is used for press molding, then high-cycle operation is achieved, but precise control of pressurizing force and maintaining pressurized state becomes difficult
Solution Approach 1:
The press device divides the press molding process into two distinct phases: a reciprocating mechanism (crank mechanism) for high-speed positioning and approach, and a pressurizing mechanism (hydraulic cylinder) for precise pressurizing force application. This segmentation allows each mechanism to optimize its function - the reciprocating mechanism maintains high-cycle operation while the pressurizing mechanism provides precise force control, resolving the contradiction between productivity and control precision.
2Force
If a crank mechanism pressurizes at bottom dead center, then press molding is performed, but large holding torque and large-capacity servomotors are required
Solution Approach 1:
The invention replaces the mechanical pressurizing function of the crank mechanism with a hydraulic pressurizing mechanism. Instead of using a large-capacity servomotor to generate and hold pressurizing force through mechanical means, the system uses hydraulic pressure to generate the required force. This substitution eliminates the need for large holding torques and large-capacity servomotors, as the hydraulic system can maintain pressure statically without continuous high-power input.
3Duration of action of stationary object
If the slide stops at pressurizing position for fixed time, then pressurized state is maintained, but great holding torque is required
Solution Approach 1:
The invention replaces the mechanical holding torque requirement with a hydraulic pressure holding capability. The hydraulic cylinder mechanism can maintain the pressurized state for the required duration through static hydraulic pressure without needing continuous mechanical torque. This eliminates the contradiction between maintaining pressurized state duration and requiring great holding torque.
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
Enables high-cycle press molding with accurate pressurizing force control, reducing the need for large servomotors and ensuring stable, high-quality press working with reduced hydraulic pump requirements and simplified structure.
Implementation Method 1
a hydraulic cylinder mechanism that holds the bolster and the lower die while pressurizing the lower die toward the upper die
Data Source
AI summary
A press device includes a slide configured to hold a first die, a holding portion configured to hold a second die, a reciprocating mechanism that causes the slide to reciprocate in a stroke direction in which the first die and the second die move closer to or away from each other, and a pressurizing mechanism that holds the second die while pressurizing the second die toward the first die with a stroke shorter than that of the reciprocating mechanism in a state where the first die and the second die are moved close to each other by the reciprocating mechanism.