Adjustable Spring-Damper Mounting for Variable Punching Press Loads
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Solution Overview
Problem
Large punching presses with spring-damper elements face challenges in variable operation due to differing imbalance masses and punching frequencies, leading to excessive vibration amplitudes at low frequencies and high ground loading at high frequencies, limiting their range of application.
Innovation Solution
A spring-damper element with a hydraulic damper unit and an overload valve that adjusts damping characteristics by allowing fluid flow between chambers, minimizing ground loading through adjustable pressure settings via manual or automated means, and a design that reduces damping during rebound, enabling optimal operation across varying conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If spring-damper elements are designed for high punching frequencies, then damping performance is improved, but ground loading becomes excessively high at low punching frequencies
Solution Approach 1:
The spring-damper element incorporates an adjustable damper whose damping coefficient can be dynamically changed based on operating conditions. This allows the system to adapt between high-frequency and low-frequency operations, preventing excessively high ground loading at low frequencies while maintaining adequate damping performance at high frequencies.
Solution Approach 2:
The invention changes the damping parameter of the spring-damper element by adjusting the damper's damping coefficient. This parameter adjustment enables the system to optimize performance across different punching frequencies, resolving the contradiction between damping performance and ground loading.
2Adaptability or versatility
If spring-damper elements are designed for low punching frequencies, then adaptability is improved, but vibration amplitudes become excessively large at high punching frequencies
Solution Approach 1:
The adjustable damper allows the system to dynamically adapt its damping characteristics to different operating frequencies. By increasing damping at high frequencies, the system reduces vibration amplitudes while maintaining adaptability across the full operational range.
Solution Approach 2:
The damping coefficient parameter is adjusted based on punching frequency to optimize performance. At high frequencies, increased damping reduces vibration amplitudes, while at low frequencies, reduced damping maintains adaptability, thus resolving the contradiction between operational range and vibration control.
3Device complexity
If fixed damping characteristics are used, then device complexity is reduced, but the system cannot adapt to variable operating conditions
Solution Approach 1:
The damper is designed with adjustable characteristics, allowing the damping coefficient to be changed based on operating conditions. This dynamic capability enables adaptation to variable punching frequencies and tool weights while adding minimal complexity to the overall system.
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 variable operation of punching presses with minimal ground loading by adjusting damping characteristics, reducing vibration amplitudes and ground loading across a wide range of frequencies, and allowing for flexible mounting without fixed foundations.
Implementation Method 1
a hydraulic damper unit (3), which comprises a first fluid chamber (4) and a second fluid chamber (5), wherein during an intended operation a hydraulic fluid is displaced from the first fluid chamber (4) via a throttle point (6) into the second fluid chamber (5) when the spring-damper element (2) is compressed, and thus a damping effect is achieved
Implementation Method 2
An overload valve (7) is arranged between the first fluid chamber (4) and the second fluid chamber (5) of the damper element, which overload valve opens when a specific fluid pressure is reached in the first fluid chamber (4) or when a specific pressure difference is reached between the first fluid chamber (4) and the second fluid chamber (5) and releases a bypass via which hydraulic fluid then flows from the first fluid chamber (4) into the second fluid chamber (5), bypassing the throttle point (6), thereby substantially preventing a further increase in pressure in the first fluid chamber (4)
Data Source
AI summary
The invention relates to a spring-damper element (2) for mounting a punching press (1), with a hydraulic damper unit (3) with a first fluid chamber (4) and a second fluid chamber (5), wherein, in the intended operation, a hydraulic fluid is displaced from the first fluid chamber (4) via a throttle point (6) into the second fluid chamber (5) when the spring-damper element (2) is compressed. The damper unit further comprises an overload valve (7) arranged between the first fluid chamber (4) and the second fluid chamber (5), which overload valve opens when a specific fluid pressure is reached in the first fluid chamber (4) or when a specific pressure difference is reached between the first fluid chamber (4) and the second fluid chamber (5) and releases a bypass (8) via which hydraulic fluid then flows from the first fluid chamber (4) into the second fluid chamber (5) bypassing the throttle point (6). Thereby, the spring-damper element (2) is designed in such a way that the fluid pressure or the pressure difference, respectively, at which the overload valve (7) opens can be adjusted when the spring-damper element (2) is installed as intended. With such spring-damper elements according to the invention, it becomes possible to create a mounting arrangement for a punching press, the damping characteristics of which can be adjusted without significant effort, such that a variable operation of the press in wide ranges becomes possible while keeping the ground loading to a minimum in each case.