Rail Milling Cutter Head Phase-Shifted Corrugation Control
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Solution Overview
Problem
Existing rail milling methods result in milling corrugations that require an additional grinding step to smooth the rail profile, leading to noise pollution in railways due to the shape and arrangement of these undulations.
Innovation Solution
The method involves a rotary milling cutter head with cutting edges arranged at predetermined inclinations and/or lateral/vertical offsets to phase-shift or alter the wavelength of milling corrugations, allowing for noise reduction without an additional grinding step by ensuring the wavelength of corrugations is smaller than the wheel contact area, thus preventing wheel contact with troughs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional rail milling is performed with standard cutter head blade arrangements, then the rail head profile can be milled efficiently in one operation, but milling corrugations are produced that require additional grinding steps and cause noise pollution
Solution Approach 1:
The patent applies local quality by varying the inclination angles and lateral/vertical offsets of individual cutting edges on the cutter head. Each cutting edge is configured with specific local parameters (inclination angle, lateral offset, vertical offset) that differ from others, creating localized variations in the milling corrugation patterns across different tracks. This local differentiation eliminates the uniform corrugation pattern that causes noise while maintaining efficient milling of the rail head profile.
Solution Approach 2:
The patent implements parameter changes by modifying the geometric parameters of the cutting edges on the cutter head. Specifically, the inclination angles, lateral offsets, and vertical offsets of the cutting edges are varied to change the characteristics of the milling corrugations (wavelength, amplitude, phase). By changing these parameters, the resulting corrugations have different wavelengths and phases that do not reinforce each other, thereby reducing noise emissions while maintaining productive milling operation.
2Object-generated harmful factors
If additional grinding steps are performed to smooth the rail profile and eliminate milling corrugations, then noise emissions are reduced, but processing time and operational complexity increase
Solution Approach 1:
The patent applies preliminary action by configuring the cutter head cutting edges with specific inclination angles and offsets before the milling operation begins. This pre-configured arrangement ensures that the milling corrugations produced during the single milling pass already have the desired phase shifts and wavelength variations that minimize noise. By performing the noise-reducing action in advance (during cutter head setup) rather than through additional processing steps after milling, the method eliminates the need for time-consuming grinding operations.
Solution Approach 2:
The patent merges the functions of profile milling and corrugation control into a single operation. By integrating the phase-shifting and wavelength-modifying cutting edge configurations directly into the milling cutter head, the process combines what would traditionally require separate operations (milling followed by grinding) into one unified milling pass. This merging maintains productivity while achieving the noise reduction goal.
3Object-generated harmful factors
If cutting edges are arranged with inclinations and offsets to phase-shift milling corrugations, then noise is reduced, but the complexity of cutter head design and manufacturing increases
Solution Approach 1:
The patent manages device complexity by systematically varying specific parameters (inclination angles, lateral offsets, vertical offsets) of the cutting edges while maintaining the overall cutter head structure. Rather than redesigning the entire cutter head architecture, the solution involves adjusting measurable geometric parameters of existing cutting edge positions. This approach to parameter changes allows for standardized manufacturing processes and simplifies the implementation of the noise-reduction concept within the existing cutter head design framework.
Data Source
Figure 1
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Figure 4A~4B
AI summary
A railway track maintenance vehicle has a chassis that advances along the rails while presenting grinding wheels to the rail surface. The grinding wheel has a side guide flange. The wheel further has parallel rings of grinding tracks, each with series of cutters. The cutters form rows, each cutting block slightly offset from the next. Each cutter block is set at a different cutting angle to the adjacent cutter.