Dual-Rotor Milling Machine for Surface Finish Control

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Solution Overview

Problem

Existing milling machines lack sufficient adjustment and control over the characteristics of the resulting surface finish, such as texture and surface finish, due to limitations in rotor arrangement and pitch.

Innovation Solution

A milling machine with a first rotor and a second rotor, where the second rotor is positioned rearward and can be laterally movable and adjustable, allowing for different pitch configurations and independent control, enabling varied surface finishes.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If a single rotor with fixed pitch cutting assemblies is used, then the machine structure is simple, but the surface finish characteristics cannot be adjusted or controlled

Engineering Contradiction:

Improvesurface finish controlVSAvoidmachine structure

Core Design Contradiction:

Adaptability or versatilityVSDevice complexity

Solution Approach 1:

The single rotor is divided into two separate rotors (first rotor and second rotor), each capable of independent operation with different pitch configurations. This segmentation allows each rotor to be optimized for specific surface finish requirements while maintaining relative structural simplicity through modular design

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The cutting assemblies on the rotors are made adjustable rather than fixed. The pitch between cutting assemblies can be modified to change the surface finish characteristics, transforming a static structure into a dynamic, adaptable system that can respond to different milling requirements

Inventive Principle:

Principle #15Dynamics

2Productivity

If cutting assemblies are arranged with larger pitch, then the cutting operation is more aggressive and removes material faster, but the resulting surface finish is rougher

Engineering Contradiction:

Improvematerial removal rateVSAvoidsurface finish quality

Core Design Contradiction:

ProductivityVSManufacturing precision

Solution Approach 1:

The milling process is segmented into two stages using two rotors: the first rotor with larger pitch performs aggressive material removal for high productivity, while the second rotor with smaller pitch refines the surface for better finish quality. This segmentation allows both contradictory requirements to be satisfied in sequence

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The first rotor performs preliminary aggressive cutting to remove material quickly, preparing the surface for the second rotor. This preliminary action enables the second rotor to focus on surface refinement without being burdened by heavy material removal, thus achieving both high productivity and good surface finish

Inventive Principle:

Principle #10Preliminary action

3Adaptability or versatility

If the second rotor is made laterally movable, then the pitch configuration can be adjusted for different surface finishes, but the machine complexity increases

Engineering Contradiction:

Improvepitch configuration flexibilityVSAvoidlateral movement mechanism

Core Design Contradiction:

Adaptability or versatilityVSDevice complexity

Solution Approach 1:

The lateral movement mechanism serves multiple functions: it adjusts the pitch configuration of the second rotor, enables different surface finish patterns, and allows the second rotor to engage or disengage from the molding board as needed. This multi-functionality justifies the added complexity by providing versatile control over the milling process

Inventive Principle:

Principle #6Universality (Multi-functionality)

Data Source

PatentUS12522986B2Milling machines, systems, and related methods

Publication Date: 2026.01.13 CATERPILLAR PAVING PROD INC

AI summary

A milling machine includes a frame, a plurality of wheels or track members coupled to the frame, a moldboard movably coupled to the frame, a first rotor, and a second rotor. The first rotor is rotatably coupled to the frame. The second rotor is positioned to the rear of the first rotor and rotatably coupled to the moldboard.