Machine Tool Guide Arm Torsional Stress Reduction
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Solution Overview
Problem
Existing machine tools face challenges in achieving a compact and stable tool carrier unit that allows for precise machining, as they often experience significant forces and moments during tool movement, leading to potential torsional stress on the guide arm.
Innovation Solution
The solution involves positioning the intersection point between the tool plane and the turret axis within a geometric cylinder space around the longitudinal axis, with a radius corresponding to a fraction of the guide arm's mean radius, minimizing torsional stress on the guide arm and allowing it to absorb forces without significant deformation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the tool carrier unit is designed to be compact, then the size of the machine tool is reduced, but the stability and precision of machining may deteriorate due to increased torsional stress on the guide arm
Solution Approach 1:
The patent changes the geometric parameters of the tool carrier unit by positioning the intersection point of the tool plane and turret axis within a specific cylindrical space defined by radius R ≤ 0.5 × mean radius of guide arm. This parameter optimization minimizes the moment arm and reduces torsional stress on the guide arm, allowing a compact design without compromising stability
Solution Approach 2:
The patent applies local quality by creating a specific geometric zone (cylindrical space with radius R) around the longitudinal axis where the intersection point must be positioned. This localized geometric constraint ensures that forces are optimally distributed at the critical interface between the tool plane and guide arm, providing enhanced stability in the critical region while maintaining overall compactness
2Manufacturing precision
If the tool carrier unit is designed for high stability, then machining precision is improved, but the size of the machine tool increases
Solution Approach 1:
The patent achieves high machining precision through optimized geometric parameters rather than increased size. By constraining the intersection point within the cylindrical space (radius R ≤ 0.5 × mean radius of guide arm), the design minimizes torsional moments while maintaining a compact tool carrier unit, thereby achieving precision without proportional size increase
3Stress or pressure
If the intersection point is positioned close to the longitudinal axis, then torsional stress on the guide arm is reduced, but the complexity of positioning and alignment increases
Solution Approach 1:
The patent defines a clear geometric criterion (cylindrical space with radius R ≤ 0.5 × mean radius of guide arm) that simplifies the positioning requirement. Rather than requiring precise positioning at a single point, the cylindrical zone provides a tolerance range that reduces alignment complexity while still ensuring minimal torsional stress on the guide arm
Data Source
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AI summary
The invention relates to a machine tool which comprises a machine frame, a first workpiece support unit arranged on the machine frame and having a workpiece holder, at least one tool support unit arranged on the machine frame and a working chamber in which a workpiece held in the workpiece holder can be machined by means of the tool. The aim of the invention is to increase accuracy of machining of said machine tool. For this purpose, the tool support unit has a tool support base, a guide arm, extending with a longitudinal axis, and a tool turret held on the guide arm. Said tool turret has a turret housing arranged on the guide arm relative which housing the turret head can be rotated about a turret axis that is perpendicular to the longitudinal axis. An intersection between a tool plane of the turret head and the turret axis lies inside a geometrical cylindrical space about the longitudinal axis and has a radius that corresponds to an average radius of the guide arm.