Ram Clamping Collet Structure for High-Torque Short Rams
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Solution Overview
Problem
Existing ram clamping systems suffer from high torsion due to the considerable length of the ram, leading to reduced holding torque and positioning accuracy.
Innovation Solution
A ram clamping system with a rotationally symmetrical base body and a collet chuck, featuring a collet that extends beyond the base body to accommodate shorter rams, and includes a collet chuck holder tensioned by a spiral and disc spring, allowing for higher holding torques and improved positioning accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of moving object
If a long ram is used in the clamping system, then the structural reach and clamping capability are improved, but the torsion of the ram increases leading to reduced holding torque
Solution Approach 1:
The clamping system is divided into two functional segments: a short ram that provides high torsional rigidity and holding torque, and a separate holder that provides the necessary reach and positioning. The holder acts as an extension that does not compromise the ram's mechanical properties.
Solution Approach 2:
The holder serves as an intermediary component between the spindle and the workpiece/tool. It transmits the clamping force from the short ram to the workpiece while providing the necessary reach, thereby decoupling the requirements for long reach and high holding torque.
2Length of moving object
If a long ram is used in the clamping system, then the clamping reach is improved, but the positioning accuracy deteriorates due to higher torsion
Solution Approach 1:
The system separates the positioning function (handled by the precision holder) from the clamping function (handled by the short ram). This segmentation allows each component to be optimized for its specific function without compromise.
Solution Approach 2:
The holder acts as a precision intermediary that maintains positioning accuracy while allowing the short ram to provide stable clamping force. The holder's design ensures that the workpiece or tool is positioned accurately before clamping.
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 system achieves higher holding torques and maintains precise positioning by using shorter rams with reduced torsion, facilitated by the collet's design and spring tensioning mechanism, enabling easier tool or workpiece exchange.
Implementation Method 1
the collet chuck holder within the base body is tensioned in the axial direction by a spiral spring and in the direction of expansion by a disc spring
Data Source
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AI summary
A ram clamping system (100) is provided with a rotationally symmetrical base body (110) which has an opening which passes through the rotationally symmetrical base body (110) along its axis of symmetry and in which opening a draw rod (140) runs, with a collet chuck (120) which can be clamped by means of the draw rod (140) for fixing a ram (190) belonging to the ram clamping system (100), and with an exchangeable holder (180), the interior (181) of which the ram (190) passes through before entering the collet chuck (120), in which at least a section of the collet chuck (120) projects beyond the end face of the base body (110), on which the exchangeable holder (180) is arranged, in the direction of extension of the draw rod (140) and enters the interior (181) of the exchangeable holder (180).