Finishing Tool Pivoting for Convex Workpiece Geometry
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Solution Overview
Problem
Existing finishing processes are limited in their ability to create or change the shape of machined workpiece sections, particularly in producing non-cylindrical workpieces with a predeterminable convex shape, and are dependent on pre-machining geometry, with grinding processes failing to achieve the surface properties attainable through finishing.
Innovation Solution
A method and device that incorporate a pivoting movement of the finishing tool during the finishing process, allowing for a curved tool path and enabling targeted material removal across different axial sections, enabling the generation of non-linear surface shapes and convex or crowned geometries by controlling the finishing tool's movement and pressure distribution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a conventional finishing process is used, then the surface properties are improved, but the ability to create or change the shape of workpiece sections is limited
Solution Approach 1:
The invention makes the finishing tool dynamically movable in the axial direction through a drive mechanism, allowing the tool to perform linear movements superimposed on the oscillating movement. This dynamic positioning capability enables selective material removal from different axial sections, transforming the finishing process from a static surface treatment to an active shaping operation that can create crowned and non-linear surface shapes
Solution Approach 2:
The invention adds the axial dimension to the traditional finishing tool movement by superimposing linear axial movements on the conventional oscillating movement. This dimensional extension allows the tool to access different axial positions of the workpiece, enabling three-dimensional shape control rather than limited two-dimensional surface finishing, thus achieving crowned geometries and non-linear surface profiles
2Shape
If grinding is used as the last shaping operation, then the contour can be defined, but the surface properties achievable are inferior to finishing
Solution Approach 1:
The invention merges the contouring capability of grinding with the superior surface properties of finishing by integrating axial positioning control into the finishing process. The finishing tool, equipped with a drive mechanism for axial movement, can now perform both shaping (contouring) and surface finishing operations in a single process, eliminating the need for separate grinding and finishing steps while achieving both geometric accuracy and excellent surface quality
3Manufacturing precision
If finishing is used to improve shape values, then the machining volume is limited to less than approx. 10 μm, but this limits the ability to correct long-wave components
Solution Approach 1:
The invention enables the finishing tool to dynamically position itself at different axial locations through controlled linear movements, allowing selective material removal from specific axial sections. This dynamic positioning capability significantly increases the effective machining volume compared to traditional finishing, enabling the correction of long-wave components and creation of crowned geometries while maintaining the low material removal rates characteristic of finishing processes
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 approach allows for the creation of complex surface shapes, reducing dependency on pre-machining and enabling the production of workpieces with specific axial geometries, potentially eliminating the need for pre-grinding and enhancing the efficiency of the finishing process with increased machining volume and self-sharpening of the finishing tool.
Implementation Method 1
a finishing tool covered with a granular cutting agent is pressed against the peripheral surface to be machined
Implementation Method 2
an oscillating relative movement parallel to the workpiece surface is generated between the workpiece and the finishing tool
Data Source
Figure 1~2
Figure 3~5
Figure 4A~4B
AI summary
In a method for finish machining of peripheral surfaces of rotationally symmetrical workpiece sections on workpieces, a finishing tool (100) comprising a pressing force in a pressing direction (AR) is pressed on the peripheral surface to be machined when a peripheral surface is machined. In order to produce material removal, the workpiece is rotated about a workpiece axis (192) and an oscillating relative movement is produced between the finishing tool and the workpiece In order to produce the oscillating relative movement, the finishing tool is moved back and forth along an oscillation direction with a predeterminable oscillation stroke length and oscillation frequency. A linear movement of the finishing tool running parallel to the workpiece axis is superimposed on the oscillation movement over a linear stroke length. A pivoting movement of the finishing tool about a pivot axis running perpendicular to the workpiece axis and to the pressing direction is superimposed on the linear movement and oscillation movement. A pivot position of the finishing tool is controlled in relation to the axial position of the linear movement. In this way, different axial surface line profiles can be produced in a targeted manner by means of finishing in order, for instance, to obtain a convex shape of the workpiece sections.