Hydraulic Chuck Device with Multi-Stage Pressure Control
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Solution Overview
Problem
Conventional hydraulic chuck devices take longer to attach and detach workpieces due to low pressure oil settings, which reduces operation speed and increases time in machine tool applications, especially when dealing with workpieces of low rigidity prone to clamping distortion.
Innovation Solution
The hydraulic chuck device employs a controller that supplies pressure oil at a high first pressure to move the jaw portion quickly from the unclamping to a preliminary position, then transitions to a lower second pressure for slow movement to the clamping position, allowing for faster clamping operations while minimizing distortion, and uses a third pressure for appropriate clamping force after reaching the clamping position.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If pressure oil is set at low pressure to prevent clamping distortion of low rigidity workpieces, then clamping distortion is prevented, but operation speed decreases and attachment/detachment time increases
Solution Approach 1:
The clamping process is divided into three distinct stages with different pressure levels: first pressure for rapid approach, second pressure for precise positioning, and third pressure for final clamping. This segmentation allows each stage to be optimized independently, resolving the contradiction between speed and precision.
Solution Approach 2:
The pressure oil pressure is made dynamic rather than static, changing through three different pressure levels during the clamping process. The controller dynamically adjusts pressure based on the jaw portion's position and the specific stage of operation, enabling both high speed and high precision.
2Productivity
If pressure oil is set at high pressure to increase operation speed, then attachment/detachment time is reduced, but clamping distortion occurs in low rigidity workpieces
Solution Approach 1:
The clamping process is divided into three distinct stages with different pressure levels: first pressure for rapid approach, second pressure for precise positioning, and third pressure for final clamping. This segmentation allows each stage to be optimized independently, resolving the contradiction between speed and precision.
Solution Approach 2:
The pressure oil supply follows a periodic pattern with three distinct pressure phases. The controller periodically switches between different pressure levels according to the operation stage, enabling the system to achieve both high speed during approach and high precision during final clamping.
3Ease of operation
If large clearance is set between jaw bodies and workpiece to prevent interference with supplied workpiece, then workpiece supply is facilitated, but clamping time increases due to longer movement distance
Solution Approach 1:
The jaw portion's movement speed is made dynamic by varying pressure oil pressure during the movement process. High first pressure enables rapid traversal of the large clearance distance, while the controller dynamically adjusts to lower pressures as the jaw approaches the workpiece, ensuring both ease of operation and reduced time loss.
Solution Approach 2:
The pressure oil pressure parameter is changed through three different levels during the clamping operation. The controller adjusts the pressure parameter based on the jaw portion's position and the specific operation stage, enabling the system to efficiently cover large clearance distances while maintaining precise control.
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 approach significantly reduces workpiece attachment and detachment time while maintaining appropriate clamping force, enhancing operational efficiency and preventing clamping distortion, especially for workpieces with low rigidity.
Implementation Method 1
a cylinder portion having a cylinder hole and a piston disposed in the cylinder hole, the piston being operated by pressure oil selectively supplied into either one of two cylinder chambers formed on opposite sides of the piston
Implementation Method 2
The pressure oil supply includes a solenoid proportional control valve adjusting the pressure of the pressure oil
Data Source
AI summary
A hydraulic chuck device includes a cylinder portion operated by pressure oil, a chuck opened and closed by operation of the cylinder portion, a pressure oil supply controlling pressure of pressure oil supplied to the cylinder portion, and a chuck controller controlling the pressure oil supply. When controlling the pressure oil supply to cause a jaw portion to perform a clamping operation, during movement of the jaw portion from an unclamping position to a preliminary position situated before a clamping position, the chuck controller supplies pressure oil set at a first pressure into a cylinder chamber for clamping to move the jaw portion quickly, and during movement of the jaw portion from the preliminary position to the clamping positon, the chuck controller supplies pressure oil set at a second pressure lower than the first pressure into the cylinder chamber for clamping to move the jaw portion slowly.