Machine Tool Cutter Radial Feed Control
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Solution Overview
Problem
Conventional machine tools for machining hard-to-reach surfaces, such as valve seats in submarines and ships, lack variable control over cutter radial advancement and require cumbersome retraction processes, leading to inefficiencies in machining operations.
Innovation Solution
A machine tool with a variably controlled cutter mechanism using a pinion drive system and a control member with vanes to enable differential rotation, allowing for precise radial advancement and rapid retraction without stopping the cutter's rotary motion, utilizing a compact design suitable for confined spaces.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a star wheel with trip arm and fixed pitch lead screw is used to drive cutter radial advancement, then the cutter can incrementally advance radially during rotation, but the feed rate cannot be varied by the operator
Solution Approach 1:
The patent replaces the fixed geometry star wheel and lead screw mechanism with a dynamic control system where the cutter head rotation is differentially controlled relative to the workpiece rotation. This allows the radial feed rate to be varied continuously during operation, transforming a static mechanism into a dynamic one that adapts to operational requirements.
Solution Approach 2:
The invention substitutes the mechanical star wheel and lead screw feed control system with a differential motion control system. Instead of using fixed mechanical elements to control feed rate, the system uses variable speed control of the cutter head rotation relative to workpiece rotation, replacing complex mechanical feed control with a more flexible motion control approach.
2Power
If multiple idler gears are used in the gear train to drive the rotating cutter, then the cutter can be driven, but the machine becomes heavy and bulky
Solution Approach 1:
The patent extracts and eliminates the multiple idler gears from the drive train. By directly coupling the cutter head rotation to the workpiece rotation through differential control, the unnecessary intermediate idler gears are removed, significantly reducing the weight and complexity of the moving components while maintaining the cutter driving capability.
Solution Approach 2:
The invention replaces the static multi-gear train with a dynamic differential control system. Instead of using multiple fixed gears to transmit and control motion, the system dynamically controls the relationship between cutter head rotation and workpiece rotation, reducing the number of mechanical components and overall machine weight.
3Ease of operation
If the star wheel is manually rotated in reverse to return the cutter to starting point, then the cutter can be repositioned for second cut, but the process is time-consuming
Solution Approach 1:
The patent enables continuous useful action by allowing the cutter to be rapidly repositioned without stopping the cutting operation. The differential control system permits the cutter head to be rotated in reverse relative to the workpiece at any time during operation, eliminating idle time and maintaining continuous productive action throughout the machining cycle.
Solution Approach 2:
The invention transforms the static, discrete repositioning operation into a dynamic, continuous process. Instead of manually rotating the star wheel in reverse after completion of a cut, the system allows dynamic adjustment of cutter position during operation, enabling rapid repositioning for subsequent cuts without interrupting the overall machining process.
4Manufacturing precision
If incremental advancement mechanism is used, then the cutter can advance radially during rotation, but variable control of radial advancement is not allowed
Solution Approach 1:
The patent implements a dynamic control system where the radial advancement of the cutter is controlled through variable speed rotation of the cutter head relative to the workpiece. This differential motion control allows both precise radial positioning and variable feed rates, combining accuracy with adaptability that the fixed incremental mechanism could not achieve.
Solution Approach 2:
The invention changes the control parameter from fixed mechanical increments to variable rotational speed ratios. By controlling the speed relationship between cutter head rotation and workpiece rotation, the system achieves variable radial feed rates while maintaining positioning accuracy, allowing adaptation to different machining requirements.
Data Source
AI summary
A lightweight, compact, machine tool for radially machining a surface is provided, where the machine tool includes a cutting head having a cutter movably coupled thereto, and the cutter is further coupled to a control member such that the control member can variably control radial movement of the cutter relative to the cutting head.