Annular Machining Table Chassis for Internal Gear Cutting
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Solution Overview
Problem
Machining internal gear teeth on annular workpieces is challenging due to insufficient absorption of cutting forces by extension arms, leading to vibrations and inaccurate cuts.
Innovation Solution
A machine tool design featuring an annular machining table supported by a solid chassis extending through a central opening in the machine bed, allowing for direct transfer of cutting forces without inducing vibrations, and a rotatable machining table for precise guidance and stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If an extension arm is used to hold the machining head over the inner space, then the machining head can reach the workpiece, but the cutting forces cause vibrations that reduce machining accuracy
Solution Approach 1:
The chassis extends through the machining table from below, changing the structural support from a horizontal extension arm to a vertical support through the table thickness. This dimensional change allows the machining head to be supported from the machine bed rather than projecting from the table, eliminating vibrations while maintaining access to the inner space.
Solution Approach 2:
The chassis acts as an intermediary element that transfers cutting forces from the machining head through the machining table to the machine bed. This mediator structure distributes and absorbs the cutting forces, preventing them from causing vibrations in the extension arm while maintaining the machining head's position.
2Strength
If the machining head is supported by a rigid extension arm, then cutting forces can be transmitted, but vibrations occur that reduce cut accuracy
Solution Approach 1:
The support structure changes from a horizontal extension arm to a vertical chassis extending through the table. This allows cutting forces to be transmitted vertically to the machine bed through a rigid path, while the horizontal position is maintained by the table opening, eliminating the vibration-prone extension arm configuration.
Solution Approach 2:
The problematic extension arm is extracted from the system and replaced by a chassis that passes through the machining table. The machining table itself becomes part of the support structure, with a central opening allowing the chassis to extend through it, thereby removing the source of vibrations while maintaining force transmission capability.
3Manufacturing precision
If the machining table is fixed, then the workpiece position is stable, but the machining head cannot be accessed from below
Solution Approach 1:
The chassis is nested through the machining table, with the table forming an outer structure and the chassis passing through its central opening. This nested configuration allows the machining head to be supported from below while the workpiece remains stable on the table, integrating both functions into a unified structure.
Data Source
AI summary
A machine tool for machining gear teeth into an inner side of an annular workpiece, the tool comprising a circular substructure having an upper side, a rotary bearing on which is disposed an annular machining table adapted to support a workpiece, a chassis for supporting a tool head, and a plurality of exchangeable machining rings, an adaption ring supporting the machining ring and supporting concentric cones, and a braking device adapted to act on the adaption ring.