Pneumatic Chuck Clamping Gap Detection for Micron Precision
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Solution Overview
Problem
Existing clamping systems in machining processes face challenges in precisely monitoring clamping precision and detecting gaps between the pallet and chuck contact surfaces, which affect machining security and precision.
Innovation Solution
A method for operating a clamping system that includes a pallet and a chuck with a detection air channel and a pressure sensor, allowing for the monitoring of clamping precision by measuring pressure changes within a defined time interval after the clamping procedure, thereby detecting any gaps between the contact surfaces.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If sensor units are introduced into the clamping system to improve clamping precision, then clamping precision is improved, but device complexity increases
Solution Approach 1:
The patent uses a pneumatic detection channel with pressurized air to detect gaps between the pallet and chuck contact surfaces. The air pressure changes detected by a sensor indicate the presence and size of gaps, providing clamping precision monitoring without complex mechanical or optical sensor systems.
Solution Approach 2:
The patent replaces complex mechanical gap measurement devices with a pneumatic detection system. Instead of using mechanical probes or optical sensors that would add complexity, the system uses pressurized air flow through a detection channel to sense gaps, simplifying the overall device structure while maintaining measurement capability.
2Reliability
If continuous pressurized air is supplied into the detection air channel to maintain detection capability, then detection reliability is improved, but energy consumption increases
Solution Approach 1:
The patent implements periodic air supply to the detection channel rather than continuous supply. Pressurized air is supplied in cycles or intervals, which reduces energy consumption while maintaining sufficient detection reliability by periodically checking for gaps during the clamping process.
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 method enables precise monitoring of clamping precision and detection of gaps as small as 3-5 µm, improving machining security and precision while being energy-efficient and adaptable to various types of clamping systems.
Implementation Method 1
measuring the pressure at the detection air inlet by the pressure sensor at at least two different times within a defined time interval while the valve is closed and the pallet and the chuck are in the clamped state; determining a pressure change by calculating the pressure difference of the measured pressures
Data Source
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AI summary
The present invention is related to a method for operating a clamping system including a pallet for holding a workpiece or a tool having a pallet contact surface and a pallet locking mechanism and a chuck having a chuck contact surface and a chuck locking mechanism. The chuck includes a detection air channel for supplying a pressurized air into the chuck through a detection air inlet formed on the outer surface of the chuck and a detection hole open on the chuck contact surface communicatively connected with the detection air channel. The clamping system further comprises a valve arranged in the feeding line of the detection air inlet and a pressure sensor arranged between the valve and the detection air inlet. The method comprises the steps of: opening the valve and supplying the pressurized air with a defined pressure into the detection air channel of the chuck through the detection air inlet; conducting a clamping procedure by approaching the pallet contact surface to the chuck contact surface until the pallet locking mechanism interacts with the chuck locking mechanism to clamp the pallet with the chuck, wherein in the clamped state a gap is formed between the pallet contact surface and the chuck contact surface; conducting a clamping-state detecting procedure after the clamping procedure.