Rotation Table Clamping Mechanism Stress Distribution
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Solution Overview
Problem
The existing clamping mechanisms for rotation table devices, particularly those using worm gear mechanisms, suffer from backlash-induced rattling and stress concentration on fixing portions due to the use of plate springs, which can lead to cracking and reduced machining accuracy.
Innovation Solution
A clamping mechanism that employs a plate spring fixed to a piston and a rear plate through an annular plate, distributing stress and preventing concentration, allowing for effective clamping and unclamping of the rotation table device while reducing the risk of cracking or plastic deformation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If a plate spring is used as an urging mechanism in the clamping mechanism, then the brake disk can be urged in the clamping or unclamping direction and clamping torque can be increased, but stress concentrates on the fixing portion and the fixing portion tends to be easily cracked due to aging
Solution Approach 1:
An annular plate is introduced as an intermediary component between the plate spring and the fixing bolt. The annular plate distributes the stress from the plate spring over a larger area, preventing stress concentration at the fixing portion. This mediator component effectively transfers the urging force while protecting the fixing portion from excessive stress that would cause cracking during aging.
2Ease of operation
If the plate spring is fixed directly to the piston and rear plate using a bolt, then the plate spring can perform its urging function, but the fixing portion is easily cracked due to stress concentration during clamping/unclamping operations
Solution Approach 1:
The annular plate serves as a stress-distributing intermediary between the plate spring and the fixing bolt. During clamping and unclamping operations, the annular plate prevents direct stress transmission to the fixing portion, thereby maintaining fixing portion strength while allowing the plate spring to perform its urging function effectively.
Solution Approach 2:
The annular plate is pre-installed at the fixing portion before the plate spring is attached. This preliminary placement of the annular plate prepares the fixing area to withstand subsequent stress during clamping operations, preventing cracks before they can occur during the actual clamping/unclamping cycles.
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 effectively reduces stress concentration on the fixing portions of the plate spring, preventing cracks and ensuring accurate positioning of the rotation table, thereby enhancing machining precision and extending the lifespan of the clamping mechanism.
Implementation Method 1
a plate spring, fixed to the piston and a rear plate fixed to the casing, which urges the piston in the clamping or unclamping direction at all times by an elastic deformation restoring force
Implementation Method 2
the brake disk is sandwiched between the piston and the fixed member, the movement of the shaft integrated with the brake disk is clamped by a friction force generated between the brake disk and the fixed member
Data Source
AI summary
A clamping mechanism of rotation table device includes a shaft fixing a workpiece to an end portion thereof, a brake disk fixed to the shaft, and a clamping mechanism clamping or unclamping the brake disk by driving a piston. The clamping mechanism includes a plate spring fixed to a rear plate fixed to a casing and a piston and urging the piston in a clamping direction at all times by an elastic deformation restoring force and the plate spring is fixed to the rear plate or the piston through an annular plate.