Bogie Pivot Crossmember Design Reducing Material Waste
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Solution Overview
Problem
The conventional manufacturing process of bogie pivot crossmembers is complex and material-intensive, requiring cuts in rectangular plates to form soles, which increases labor and material costs.
Innovation Solution
A bogie pivot crossmember design featuring rectangular flanges and spacers attached to the soles by welding, eliminating the need for cuts and optimizing material usage, with spacers having variable thickness for enhanced structural constraints.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If conventional manufacturing process with cuts is used to form soles, then structural integrity is maintained, but manufacturing complexity and material waste increase
Solution Approach 1:
The pivot crossmember is divided into distinct modular components: rectangular soles, spacers, and lugs that can be manufactured separately and assembled through welding. This segmentation allows each component to be optimized independently, eliminating the need for complex cutting operations on large plates and reducing material waste significantly.
Solution Approach 2:
The invention changes the geometric parameters of the sole from conventional shapes with cutouts to simple rectangular forms. This parameter change simplifies the manufacturing process by eliminating cutting operations while the welded spacer-lug assembly provides the necessary structural functionality, thereby reducing both manufacturing complexity and material waste.
2Strength
If rectangular plates are cut to form soles, then structural requirements are met, but labor time and manufacturing cost increase
Solution Approach 1:
The rectangular soles, spacers, and lugs are prepared in advance as separate standardized components with pre-defined welding interfaces. This preliminary preparation eliminates the need for time-consuming on-site cutting and shaping operations, significantly reducing manufacturing time while maintaining structural integrity through the optimized welded assembly.
Solution Approach 2:
By segmenting the pivot crossmember into separate rectangular components (soles, spacers, lugs) that are welded together, the invention eliminates the need for complex cutting operations on large plates. Each component can be manufactured efficiently using standard processes, reducing overall labor time while maintaining structural strength.
3Shape
If complex cutting operations are performed on plates, then sole shape is achieved, but device complexity increases
Solution Approach 1:
Instead of starting with a large plate and cutting away material to create the sole shape, the invention inverts the approach by using simple rectangular plates as the base and adding welded spacers and lugs to achieve the required geometry. This inversion transforms a complex subtractive manufacturing process into a simple additive process, significantly reducing device complexity.
Solution Approach 2:
The invention fundamentally changes the geometric parameters of the sole from complex shapes requiring cutting operations to simple rectangular forms. The required structural geometry is achieved not by the sole shape itself but by the welded assembly of rectangular soles with spacers and lugs, thereby eliminating manufacturing complexity.
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 design simplifies manufacturing, reduces labor and material costs, and achieves a weight reduction of approximately 100 kg by eliminating material waste, while maintaining structural integrity.
Implementation Method 1
the spacers are fixed by welding to the flanges of the pivot crosspiece
Data Source
Figure 1~2
Figure 3~4
AI summary
The bogie has a pivoted bolster (34) comprising friction arms (40-46) for connecting upper and lower plates (36, 38), where the plates are in rectangular shape. The friction arms are fixed on large sides of the rectangular plates by welding. The thickness of the friction arms is equal to thickness of the lower plate. Sills are provided with orifices for receiving edges of the plates and edges of the friction arms.