Internal Hob Arm Chamfering for Internal Gearing
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Solution Overview
Problem
Existing methods for chamfering internal gearings are inefficient, particularly for smaller diameters, as they require substantial construction effort and cannot access both sides of the gearing effectively, leading to incomplete deburring and increased operational complexity.
Innovation Solution
An apparatus with a rotatably supported workpiece holder and tool holder, featuring an internal hob arm that can travel into the center opening of the workpiece, allowing the chamfer hob to engage with edges on both the upper and lower sides, enabling efficient machining of internal gearings with diameters between 50 mm and 800 mm, and utilizing a sensor for precise alignment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If conventional chamfering methods are used for internal gearings, then the process works for larger diameters, but it requires substantial construction effort and cannot access both sides of the gearing effectively
Solution Approach 1:
Instead of bringing multiple tools to the workpiece from the outside, the invention inverts the approach by having a single chamfer hob travel through the center opening of the internal gearing to access edges on both sides. The tool holder is arranged at an internal hob arm whose free end can be traveled into the center opening, allowing the chamfer hob to machine edges on both the upper and lower sides of the gearing sequentially.
Solution Approach 2:
The same chamfer hob is used to machine both edges of the internal gearing (upper side and lower side) by traveling the tool holder through the center opening. This multi-functional approach eliminates the need for separate tools or complex positioning mechanisms for each edge, reducing device complexity while improving ease of operation.
2Ease of operation
If multiple chamfer hobs are used to access both sides of the gearing, then both edges can be machined, but the device complexity increases substantially
Solution Approach 1:
Instead of using multiple tools positioned outside the workpiece, the invention inverts the approach by having a single chamfer hob travel through the center opening of the internal gearing. This allows one tool to access both edges by moving through the interior space, eliminating the need for multiple external tools and their associated positioning mechanisms.
Solution Approach 2:
The invention adds the dimension of axial movement through the center opening, allowing the chamfer hob to transition from machining the upper side to machining the lower side by traveling axially through the interior of the workpiece. This dimensional approach replaces the need for multiple tools with a single tool that moves through space.
3Stability of the object's composition
If a fixed position console is used for chamfering, then the apparatus is stable, but it cannot be used for smaller internal gearings due to insufficient construction space
Solution Approach 1:
The invention transitions from a fixed position console to a dynamic system where the tool holder can be traveled along the internal hob arm into the center opening. This dynamic positioning capability allows the apparatus to adapt to different workpiece sizes, particularly smaller internal gearings, while maintaining stability through controlled movement mechanisms.
Solution Approach 2:
The tool holder and chamfer hob are nested within the internal hob arm structure, which itself can be positioned within the center opening of the workpiece. This nested configuration allows the apparatus to access smaller workpiece diameters by fitting the tooling system through the center opening, while the overall structure remains stable through its mounting on the machine table or support.
Data Source
AI summary
The present disclosure relates to an apparatus for chamfering at least one edge of the gearing at the front side of a workpiece having internal gearing comprising at least one rotatably supported workpiece holder for holding the workpiece and comprising at least one rotatably supported tool holder for holding a chamfer hob, possibly a chamfer cut hob, wherein the tool holder is arranged at an internal hob arm whose free end can be traveled by a machine axis of the apparatus at least partly into the center opening formed by the internal gearing of the workpiece.