Hydraulic Clamping Holder With Adjustable Throttle Damping
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Solution Overview
Problem
Hydraulically clampable tool and workpiece holders experience reduced dynamic rigidity and machining precision due to flexible chamber systems that allow hydraulic medium to flow freely, leading to loss of clamping force under load changes.
Innovation Solution
Incorporating a central throttle point with an adjustable flow cross-section and separate feed channels to increase flow resistance, forcing the hydraulic medium through a bottleneck, which enhances dynamic rigidity and introduces a damping effect, thereby improving machining precision.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the chamber system allows free flow of hydraulic medium, then the clamping section is flexible and easy to operate, but the dynamic rigidity and machining precision are reduced
Solution Approach 1:
The patent changes the flow resistance parameter of the hydraulic medium by introducing a throttle point with adjustable opening cross-section. This allows the system to maintain flexibility during clamping operation while preventing excessive fluid movement that would reduce dynamic rigidity and machining precision during cutting operations.
Solution Approach 2:
The throttle point acts as an intermediary element between the chambers, controlling the flow of hydraulic medium. It mediates between the need for flexibility during clamping and the need for rigidity during machining, allowing controlled fluid movement rather than completely blocking it.
2Adaptability or versatility
If the hydraulic medium flows freely between chambers, then the clamping force is easily adjusted, but the dynamic rigidity is lost under load changes
Solution Approach 1:
The throttle point's opening cross-section parameter is adjusted to optimize the balance between adaptability and stability. During clamping, the throttle allows sufficient fluid movement for adjustment; during machining, it restricts fluid movement to maintain dynamic rigidity under varying loads.
Solution Approach 2:
The system transitions from a static fully-open configuration to a dynamically controlled flow restriction. The throttle point provides dynamic control over hydraulic medium flow, allowing the system to adapt its rigidity characteristics based on operational requirements.
3Ease of operation
If the channel system provides low flow resistance, then the hydraulic medium moves freely for clamping adjustment, but the damping effect is insufficient
Solution Approach 1:
The flow resistance parameter of the channel system is modified by introducing the throttle point with a restricted opening cross-section. This creates sufficient flow resistance to generate a damping effect that reduces vibrations and improves reliability, while still allowing controlled fluid movement for clamping adjustments.
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
The solution increases the dynamic rigidity of the tool or workpiece holder, reducing deflection and vibration by creating a damping effect, which enhances machining precision and stability under varying loads.
Implementation Method 1
increasing the flow resistance for the hydraulic medium in the chamber system by changing the flow cross-section in the adjustable throttle
Implementation Method 2
introduces a damping effect, thereby improving machining precision
Implementation Method 3
the hydraulic medium can flow back and forth in the chamber system via the channel system with virtually no resistance
Data Source
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AI summary
The invention relates to a device for the hydraulic clamping of tools or workpieces, in short, a tool or workpiece holder, with a clamping section for clamping a tool or workpiece, which clamping section has several chambers inside which are fluidly interconnected by a channel system. In order to be able to change, and in particular increase, the dynamic stiffness of the hydraulically clampable tool/workpiece holder, it is further provided that a central throttling point is arranged in the channel system with an actuating element by means of which a flow cross-section in the central throttling point can be changed.