Cushion Pin Pressure Equalization for Stable Die Cushion Load
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Solution Overview
Problem
Conventional cushion pin pressure equalizing devices for die cushion devices face issues such as troublesome maintenance of pressure equalizing hydraulic cylinders, excessive impact during die cushion load application, and inadequate fulfillment of drawing functions due to surge pressures and high fluid temperatures, which lead to piston seal deterioration and inefficiencies in blank holder load control.
Innovation Solution
A cushion pin pressure equalizing device that includes a hydraulic cylinder group with ascending-side pressurizing chambers in communication, a hydraulic device for supplying or discharging working fluid, a pressure detector, and a controller to set and maintain an initial pressure based on the total volume of the hydraulic cylinder group and the working fluid's volume elastic modulus, ensuring the pressure corresponds to the lowest die cushion load, thereby absorbing variations in cushion pin height and stabilizing the die cushion load application.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If pressure equalizing hydraulic cylinders are used to absorb cushion pin height variations, then blank holder load equalization is improved, but maintenance complexity increases due to piston seal deterioration from surge pressures and high fluid temperatures
Solution Approach 1:
The patent extracts the pressure equalization function from the hydraulic cylinders by providing separate initial pressure adjusting devices for each hydraulic cylinder. This allows the cushion pins to be equalized independently without relying on complex hydraulic pressure balancing, thereby reducing maintenance needs while maintaining manufacturing precision.
Solution Approach 2:
The patent applies preliminary action by pre-adjusting the initial pressure in each hydraulic cylinder's ascending-side pressurizing chamber before the pressing operation begins. This preliminary pressure adjustment ensures that cushion pins of different lengths are properly supported from the start, eliminating the need for complex real-time pressure equalization during operation and reducing maintenance complexity.
2Speed
If initial pressure is controlled in ascending-side pressurizing chambers to absorb cushion pin height variations, then response speed to die cushion load application is improved, but device complexity increases due to additional pressure control mechanisms
Solution Approach 1:
The patent segments the pressure control function by providing individual initial pressure adjusting devices for each hydraulic cylinder's ascending-side pressurizing chamber. This segmentation allows independent and rapid adjustment of each cylinder's initial pressure, improving response speed while keeping each control mechanism simple and modular, thereby not significantly increasing overall device complexity.
3Reliability
If surge pressures are reduced to minimize fluid temperature increase, then reliability of piston seals is improved, but blank holder load control accuracy may be compromised
Solution Approach 1:
The patent applies preliminary action by setting the initial pressure in each hydraulic cylinder before the pressing operation begins. This preliminary pressure setup ensures that when the pressing operation starts, the cushion pins are already properly supported, allowing the system to operate with minimal surge pressures and fluid temperature increases while maintaining accurate blank holder load control through the pre-established pressure conditions.
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 configuration allows for the absorption of cushion pin height variations within the shortest stroke, stabilizes the response to die cushion load application without delay, reduces maintenance needs by minimizing surge pressures and fluid temperature, and enhances the accuracy and efficiency of blank holder load control.
Implementation Method 1
a hydraulic device configured to supply working fluid to the ascending-side pressurizing chambers of the hydraulic cylinder group or to discharge the working fluid from the ascending-side pressurizing chambers
Implementation Method 2
an initial pressure setting unit configured to set an initial pressure in the ascending-side pressurizing chambers of the hydraulic cylinder group... so that a pressure of the working fluid that increases when a total volume of the working fluid having the initial pressure is compressed by the volume change amount becomes a pressure
Implementation Method 3
the initial pressure setting unit sets the initial pressure based on a total volume of the ascending-side pressurizing chambers of the hydraulic cylinder group and a pipe line, a minimum volume change amount of the ascending-side pressurizing chambers of the hydraulic cylinder group when a variation in height of the plurality of cushion pins is absorbed and a volume elastic modulus of the working fluid
Data Source
AI summary
A cushion pin pressure equalizing device that can absorb a variation in height of a plurality of cushion pins and control a die cushion load highly accurately, a die cushion device, and a cushion pin pressure equalizing method are provided. An initial pressure in ascending-side pressurizing chambers of a pressure equalizing hydraulic cylinder group for absorbing a variation in height of cushion pins is controlled so as to be an appropriate pressure. The variation in height of the plurality of cushion pins can be absorbed within a shortest stroke of a slide after the slide comes into collision with a cushion pad so as to equalize die cushion loads that are applied individually to the cushion pins and a target die cushion load can be generated within the shortest stroke of the slide, whereby a response to application of the die cushion load can be stabilized without excessive delay.