Helical Sector Gear Powder Compaction With a Rotatable Die
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Solution Overview
Problem
Existing methods for forming helical sector gears, particularly those with powdered metal, face challenges in achieving uniform compaction due to the helical configuration, requiring both upper and lower punch assemblies to rotate, which complicates the process and often necessitates machining operations for finishing.
Innovation Solution
A die set and method for forming helical sector gears that includes a die with specific radial and circumferential surfaces, coupled with rotatable and non-rotatable punch assemblies, allowing for compacting of powdered metal between the punch assemblies while accommodating the helical geometry, enabling efficient formation of helical teeth without the need for extensive machining.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If both upper and lower punch assemblies rotate to accommodate helical gear configuration, then uniform compaction of powdered metal is achieved, but device complexity increases due to bearing requirements
Solution Approach 1:
Instead of rotating both punch assemblies to accommodate the helical configuration, the invention inverts the approach by making the die rotatable while keeping the punch assemblies stationary. This allows the die to follow the helical path and form the gear teeth, achieving uniform compaction without requiring complex bearing arrangements on both punches.
Solution Approach 2:
The rotatable die serves multiple functions: it forms the helical gear teeth geometry, accommodates the helical configuration, and enables uniform compaction of powdered metal. By concentrating the rotational capability in the die rather than both punches, the system achieves multi-functionality with reduced complexity.
2Manufacturing precision
If traditional machining operations like milling or hobbing are used to form helical sector gears, then gear precision is achieved, but productivity decreases due to multiple processing steps
Solution Approach 1:
The invention performs preliminary action by forming the complete helical gear geometry directly during the compaction process itself. The rotatable die creates the helical teeth shape as the powdered metal is being compacted, eliminating the need for subsequent machining operations like milling or hobbing that would otherwise be required to achieve the final gear geometry.
Solution Approach 2:
The invention merges the compaction process with the gear forming process. Instead of separating these operations (compaction followed by machining), the rotatable die integrates both functions into a single step, where the helical gear teeth are formed directly during compaction, thereby improving productivity while maintaining precision.
3Manufacturing precision
If extensive machining operations are performed after compaction, then gear surface quality is improved, but loss of time increases due to post-processing requirements
Solution Approach 1:
The rotatable die performs preliminary action by creating the final gear surface geometry directly during compaction. The helical teeth are formed with their final shape and surface quality in the compaction step itself, eliminating or minimizing the need for subsequent machining operations that would otherwise be required to achieve the desired surface quality.
Data Source
AI summary
A helical sector gear having a body and a gear segment having a plurality of helical teeth. The gear segment has a toothed sector, on which all of the helical teeth are formed, and spacing segments on the opposite circumferential ends of the toothed sector. Each of the spacing segments has a circumferential surface, which is longer than a pitch of the helical teeth, and a radial surface that is formed in a helical manner that conforms to the helix angle of helical teeth. A die set for forming the helical sector gear and a related method are also provided.