Orbital Cutting Edge Motion for Smooth High-Feed Rail Machining
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Solution Overview
Problem
Current machining processes for workpieces, such as rails, often result in surfaces with ripples and track patterns due to milling, and while planing reduces these issues, it requires lower feed speeds and higher power, necessitating additional grinding for surface smoothing.
Innovation Solution
A device with a rotating cutting edge that combines high-speed rotational movement with a superimposed linear movement, allowing for uninterrupted machining at high feed rates, mimicking planing's benefits while avoiding milling's drawbacks, and featuring adjustable cutting edge engagement for varying cross-sectional geometries.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If milling is used to machine the workpiece surface, then high feed rates can be achieved, but machining marks such as waviness and track patterns appear on the surface
Solution Approach 1:
The cutting edge is moved dynamically along an orbital path combining rotational and linear components. The carrier rotates about an axis while the cutting edge simultaneously moves linearly parallel to the workpiece surface, creating a dynamic cutting motion that eliminates stationary contact points and prevents machining marks while maintaining high feed rates
Solution Approach 2:
The cutting motion is extended from simple rotation into a three-dimensional orbital path. By superimposing linear movement parallel to the workpiece surface onto the rotational movement, the cutting edge traces an extended orbital path that distributes cutting forces and eliminates the formation of waviness and track patterns
2Manufacturing precision
If planing is used to machine the workpiece surface, then flat surfaces with minimal machining marks are produced, but feed rate is reduced and power requirement increases
Solution Approach 1:
The invention merges the advantages of both milling and planing by combining rotational cutting motion with linear movement parallel to the workpiece surface. This hybrid orbital motion achieves the high feed rates of milling while producing the flat, mark-free surfaces characteristic of planing, eliminating the need for post-grinding
Solution Approach 2:
The dynamic orbital motion allows the cutting edge to continuously change its position and orientation during machining, creating a planing-like cutting action that removes material cleanly without the high power requirements and low feed rates associated with traditional planing
3Productivity
If the cutting edge is moved in a simple rotational orbit, then high-speed machining is achieved, but the cutting edge cannot adapt to varying cross-sectional geometries
Solution Approach 1:
The cutting edge position is made dynamically adjustable during the orbital motion. The linear movement component can be varied in magnitude and direction, allowing the cutting edge to adapt to different cross-sectional geometries while maintaining high orbital speeds for efficient machining
Solution Approach 2:
The orbital motion is segmented into independent rotational and linear components. This allows the linear movement parameter to be independently adjusted to match varying workpiece geometries without affecting the high-speed rotational aspect, providing versatility while maintaining productivity
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
Enables high-speed machining with minimal surface irregularities, eliminating the need for post-processing like grinding, and allows for efficient processing of workpieces of infinite length with reduced wear and maintenance interruptions.
Implementation Method 1
The cutting edge 2 is moved by the carrier 4 along an orbit 15 in a machining movement 16
Implementation Method 2
the movement of the cutting edge 2 along the orbit 15 is superimposed by a movement 17 of the cutting edge 2 out of the orbit 15
Data Source
Figure 1
Figure 2
Figure 3
AI summary
The method involves defining a geometrically cutting edge (2), and arranging the cutting edge at a carrier (4) that is circulated around an axis. The cutting edge is arranged by a retainer (5), where the cutting edge is moved with the retainer relative to the carrier. An independent claim is included for a device for machine cutting operation of a work piece, particularly rails of a track body.