Railcar Bogie Axle Box Suspension Flat Reference Surface
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Solution Overview
Problem
The existing axle box suspension manufacturing process requires extensive and inaccurate machining steps due to the semicircular shape of the second semi-tubular portion, necessitating frequent setup changes and increased man-hours for forming holes and flattening surfaces.
Innovation Solution
Incorporating a flat machining reference surface on the second semi-tubular portion allows stable placement on a machining device, eliminating the need for posture changes during machining and enabling accurate surface machining and hole formation without reversing the part, thus improving working efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the second semi-tubular portion is machined without a flat reference surface, then the machining process requires frequent setup changes and posture adjustments, but this increases machining time and reduces productivity
Solution Approach 1:
A flat machining reference surface is formed on the second semi-tubular portion before the actual machining operations. This preliminary action creates a stable baseline that enables subsequent machining steps to be performed without frequent setup changes, thereby reducing total machining time and improving productivity
2Manufacturing precision
If the through hole is formed with high accuracy, then the machining precision is improved, but the second semi-tubular portion requires stable placement and frequent posture adjustments which increase complexity
Solution Approach 1:
The flat machining reference surface is created in advance to establish a stable placement surface. This allows the second semi-tubular portion to be accurately positioned and held during hole formation without requiring complex machining setups or frequent posture adjustments, thus achieving high precision while reducing setup complexity
3Manufacturing precision
If the contact surface is machined with high accuracy, then the flatness is improved, but the semicircular shape requires the part to be reversed and repositioned multiple times which increases machining time
Solution Approach 1:
The flat machining reference surface is formed on the opposite side of the contact surface before machining the contact surface itself. This preliminary action creates a stable reference that allows the contact surface to be machined in a single positioning without reversing the part, thereby achieving high flatness while maintaining fast machining speed
Data Source
AI summary
A railcar bogie axle box suspension axle beam includes an end portion d at a tip end, a tubular portion at the end portion and being open at both car width direction sides. The tubular portion includes: a first semi-tubular portion integrally formed with a main body portion; a second semi-tubular portion brought into contact with the first semi-tubular portion from one side in the car longitudinal direction; and a bolt fastening the second semi-tubular portion to the first. The first semi-tubular portion includes: a flat opposing surface contacting the second semi-tubular portion; and a hole into which the bolt is inserted. The second semi-tubular portion includes: a flat opposing surface contacting with the first semi-tubular portion surface; a flat machining reference surface formed at an opposite side of the opposing surface; and a hole extending in a direction perpendicular to the opposing surface, the bolt inserted into the hole.