Jointed Component Positioning Surface Stabilizes Base Distance
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Solution Overview
Problem
The existing methods for manufacturing planetary carriers by powder metallurgy face challenges in maintaining high positioning accuracy due to variations in the relative positions of the punches, leading to unstable accuracy in the distance between the bases of the first and second compacts.
Innovation Solution
A method involving the formation of a positioning surface with a height difference on the second member, using a compacting die assembly with specific punches to ensure accurate alignment and contact between the first and second members, thereby stabilizing the distance between their bases.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the length of the pillar is used to determine the distance between bases of first and second compacts, then the manufacturing process is simple, but the positioning accuracy becomes unstable due to punch position variations
Solution Approach 1:
A positioning surface is introduced as an intermediary element between the pillar and the first compact. The positioning surface, formed on the second member by the second lower punch, serves as a dedicated reference surface for positioning the first member. This mediator transfers the positioning function from the pillar (which is affected by punch position variations) to a stable reference surface, thereby ensuring accurate and stable positioning without complicating the manufacturing process.
2Ease of operation
If relative positions of first and second lower punches are allowed to vary, then assembly is easier, but the accuracy of pillar length and distance between bases deteriorates
Solution Approach 1:
The forming process is segmented into distinct functions: the second lower punch is dedicated to forming the positioning surface on the second member, while the first lower punch forms the pillar. This segmentation allows each punch to perform its specific function independently without requiring precise relative positioning between them. The positioning surface serves as a stable reference that decouples the positioning accuracy from the relative punch positions, enabling easier assembly while maintaining precision.
3Productivity
If multiple segments are used in first lower punch to match number of pillars, then productivity increases, but deformation variation between segments causes positioning accuracy to deteriorate
Solution Approach 1:
The positioning surface acts as an intermediary that compensates for deformation variations in the segmented first lower punch. Each segment of the first lower punch can deform independently to match the number and position of pillars, increasing productivity. The positioning surface, formed by the second lower punch which remains undivided and stable, provides a consistent reference that offsets the positioning errors introduced by segment deformation, thereby maintaining accuracy while enabling high-productivity segmented forming.
Data Source
AI summary
Provided is a jointed component (A) in which a first member (10) and a second member (20) in which a pillar (22) stands erect on a surface of a base (21) are fixed to each other, the second member. The jointed component includes the first member and the second member including the base and the pillar disposed on the first surface of the base. The pillar is brought into contact with the first member in an axial direction. The second member includes a positioning surface (23) that has a height difference from an end surface of the second member in the axial direction and the second member includes a curved surface at a ridge between the positioning surface and a side surface of the pillar.