Clamping Device Tension Spring Axial Force Reduction
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Solution Overview
Problem
Existing clamping devices for machine tools subject the machine spindle to high axial forces due to the tension spring being braced on one side, leading to significant wear on the bearing and spindle jacket.
Innovation Solution
The tension spring is clamped between two rod parts that can move relative to each other, allowing for compression on both ends by a release mechanism, reducing axial forces on the machine part and improving the load factor of the tension spring, with a two-part clamping cone and tensioning elements that move radially to distribute force effectively.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If the tension spring is braced on one side against the machine spindle, then the clamping force is generated, but the machine spindle is subjected to high axial forces causing significant wear on the bearing and spindle jacket
Solution Approach 1:
The tension rod is divided into two separate rod parts (first rod part and second rod part) that can move relative to each other. The tension spring is clamped between these two rod parts, allowing each rod part to move independently. This segmentation enables the axial forces to be distributed and reduced on the machine spindle while maintaining the necessary clamping force on the workpiece or tool-holding fixture.
Solution Approach 2:
The two rod parts are configured to move dynamically relative to each other during the clamping and release cycles. The first rod part is movable by a pressure piston while the second rod part is moved by the release mechanism. This dynamic configuration allows the system to absorb and distribute axial forces more effectively, reducing wear on the machine spindle bearing and jacket.
2Object-affected harmful factors
If the tension spring is clamped between two movable rod parts, then the axial forces are reduced on the machine spindle, but the device complexity increases
Solution Approach 1:
The two rod parts serve multiple functions: they transmit the clamping force from the tension spring to the clamping set, they move independently to reduce axial forces on the machine spindle, and they enable the release mechanism to compress the tension spring from both ends. This multi-functionality justifies the increased structural complexity by providing wear reduction and improved force distribution.
3Force
If the release mechanism compresses the tension spring on both ends, then the load factor of the tension spring is improved, but the ease of operation decreases
Solution Approach 1:
The release mechanism utilizes the dynamic movement of the first rod part (actuated by pressure piston) and the second rod part (moved by release mechanism) to compress the tension spring from both ends simultaneously. This dynamic dual-end compression improves the load factor and force distribution on the tension spring, optimizing its performance despite the increased operational complexity.
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 configuration reduces wear on the machine part, enhances the load factor of the tension spring, and improves the clamping process by effectively utilizing axial forces, allowing for efficient clamping and easy release of the tool-holding fixture.
Implementation Method 1
a tension spring (7) for generating the pull-in force of a clamping set (6) disposed in the machine part (2) is clamped between a first rod part (17) and a second rod part (18) of the tension rod
Implementation Method 2
a pressure piston (56) for moving the first rod part (17) which is slidably mounted within a pressure chamber (55) of the enclosure and moved by means of a pressure medium
Data Source
AI summary
A clamping device for clamping a workpiece or a tool or, more specifically, a tool holding fixture in a machine part of a machine tool includes a tension rod slidably mounted within the machine part; a clamping set movable by the tension rod between clamped and released positions; a tension spring dedicated to the tension rod so as to generate the pull-in force of the clamping set; and a release mechanism, by which the clamping set can be moved against the force of the tension spring into the released position by the tension rod. To make possible effective clamping at optimum force, the tension spring is clamped between first and second rod parts of the tension rod. The second rod part can move relative to the first rod part, and, as the clamping set moves into the released position, is compressed on both ends by the release mechanism by moving the two rod parts in opposite directions.